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s390/dasd: remove unused pm related functions
[people/ms/linux.git] / drivers / s390 / block / dasd_eckd.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Carsten Otte <Cotte@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Bugreports.to..: <Linux390@de.ibm.com>
8 * Copyright IBM Corp. 1999, 2009
9 * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
10 * Author.........: Nigel Hislop <hislop_nigel@emc.com>
11 */
12
13 #define KMSG_COMPONENT "dasd-eckd"
14
15 #include <linux/stddef.h>
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/hdreg.h> /* HDIO_GETGEO */
19 #include <linux/bio.h>
20 #include <linux/module.h>
21 #include <linux/compat.h>
22 #include <linux/init.h>
23 #include <linux/seq_file.h>
24
25 #include <asm/css_chars.h>
26 #include <asm/debug.h>
27 #include <asm/idals.h>
28 #include <asm/ebcdic.h>
29 #include <asm/io.h>
30 #include <linux/uaccess.h>
31 #include <asm/cio.h>
32 #include <asm/ccwdev.h>
33 #include <asm/itcw.h>
34 #include <asm/schid.h>
35 #include <asm/chpid.h>
36
37 #include "dasd_int.h"
38 #include "dasd_eckd.h"
39
40 #ifdef PRINTK_HEADER
41 #undef PRINTK_HEADER
42 #endif /* PRINTK_HEADER */
43 #define PRINTK_HEADER "dasd(eckd):"
44
45 /*
46 * raw track access always map to 64k in memory
47 * so it maps to 16 blocks of 4k per track
48 */
49 #define DASD_RAW_BLOCK_PER_TRACK 16
50 #define DASD_RAW_BLOCKSIZE 4096
51 /* 64k are 128 x 512 byte sectors */
52 #define DASD_RAW_SECTORS_PER_TRACK 128
53
54 MODULE_LICENSE("GPL");
55
56 static struct dasd_discipline dasd_eckd_discipline;
57
58 /* The ccw bus type uses this table to find devices that it sends to
59 * dasd_eckd_probe */
60 static struct ccw_device_id dasd_eckd_ids[] = {
61 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
62 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
63 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
64 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
65 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
66 { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
67 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
68 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
69 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
70 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
71 { /* end of list */ },
72 };
73
74 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
75
76 static struct ccw_driver dasd_eckd_driver; /* see below */
77
78 static void *rawpadpage;
79
80 #define INIT_CQR_OK 0
81 #define INIT_CQR_UNFORMATTED 1
82 #define INIT_CQR_ERROR 2
83
84 /* emergency request for reserve/release */
85 static struct {
86 struct dasd_ccw_req cqr;
87 struct ccw1 ccw;
88 char data[32];
89 } *dasd_reserve_req;
90 static DEFINE_MUTEX(dasd_reserve_mutex);
91
92 static struct {
93 struct dasd_ccw_req cqr;
94 struct ccw1 ccw[2];
95 char data[40];
96 } *dasd_vol_info_req;
97 static DEFINE_MUTEX(dasd_vol_info_mutex);
98
99 struct ext_pool_exhaust_work_data {
100 struct work_struct worker;
101 struct dasd_device *device;
102 struct dasd_device *base;
103 };
104
105 /* definitions for the path verification worker */
106 struct path_verification_work_data {
107 struct work_struct worker;
108 struct dasd_device *device;
109 struct dasd_ccw_req cqr;
110 struct ccw1 ccw;
111 __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
112 int isglobal;
113 __u8 tbvpm;
114 };
115 static struct path_verification_work_data *path_verification_worker;
116 static DEFINE_MUTEX(dasd_path_verification_mutex);
117
118 struct check_attention_work_data {
119 struct work_struct worker;
120 struct dasd_device *device;
121 __u8 lpum;
122 };
123
124 static int dasd_eckd_ext_pool_id(struct dasd_device *);
125 static int prepare_itcw(struct itcw *, unsigned int, unsigned int, int,
126 struct dasd_device *, struct dasd_device *,
127 unsigned int, int, unsigned int, unsigned int,
128 unsigned int, unsigned int);
129
130 /* initial attempt at a probe function. this can be simplified once
131 * the other detection code is gone */
132 static int
133 dasd_eckd_probe (struct ccw_device *cdev)
134 {
135 int ret;
136
137 /* set ECKD specific ccw-device options */
138 ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
139 CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
140 if (ret) {
141 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
142 "dasd_eckd_probe: could not set "
143 "ccw-device options");
144 return ret;
145 }
146 ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
147 return ret;
148 }
149
150 static int
151 dasd_eckd_set_online(struct ccw_device *cdev)
152 {
153 return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
154 }
155
156 static const int sizes_trk0[] = { 28, 148, 84 };
157 #define LABEL_SIZE 140
158
159 /* head and record addresses of count_area read in analysis ccw */
160 static const int count_area_head[] = { 0, 0, 0, 0, 1 };
161 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
162
163 static inline unsigned int
164 ceil_quot(unsigned int d1, unsigned int d2)
165 {
166 return (d1 + (d2 - 1)) / d2;
167 }
168
169 static unsigned int
170 recs_per_track(struct dasd_eckd_characteristics * rdc,
171 unsigned int kl, unsigned int dl)
172 {
173 int dn, kn;
174
175 switch (rdc->dev_type) {
176 case 0x3380:
177 if (kl)
178 return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
179 ceil_quot(dl + 12, 32));
180 else
181 return 1499 / (15 + ceil_quot(dl + 12, 32));
182 case 0x3390:
183 dn = ceil_quot(dl + 6, 232) + 1;
184 if (kl) {
185 kn = ceil_quot(kl + 6, 232) + 1;
186 return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
187 9 + ceil_quot(dl + 6 * dn, 34));
188 } else
189 return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
190 case 0x9345:
191 dn = ceil_quot(dl + 6, 232) + 1;
192 if (kl) {
193 kn = ceil_quot(kl + 6, 232) + 1;
194 return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
195 ceil_quot(dl + 6 * dn, 34));
196 } else
197 return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
198 }
199 return 0;
200 }
201
202 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
203 {
204 geo->cyl = (__u16) cyl;
205 geo->head = cyl >> 16;
206 geo->head <<= 4;
207 geo->head |= head;
208 }
209
210 /*
211 * calculate failing track from sense data depending if
212 * it is an EAV device or not
213 */
214 static int dasd_eckd_track_from_irb(struct irb *irb, struct dasd_device *device,
215 sector_t *track)
216 {
217 struct dasd_eckd_private *private = device->private;
218 u8 *sense = NULL;
219 u32 cyl;
220 u8 head;
221
222 sense = dasd_get_sense(irb);
223 if (!sense) {
224 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
225 "ESE error no sense data\n");
226 return -EINVAL;
227 }
228 if (!(sense[27] & DASD_SENSE_BIT_2)) {
229 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
230 "ESE error no valid track data\n");
231 return -EINVAL;
232 }
233
234 if (sense[27] & DASD_SENSE_BIT_3) {
235 /* enhanced addressing */
236 cyl = sense[30] << 20;
237 cyl |= (sense[31] & 0xF0) << 12;
238 cyl |= sense[28] << 8;
239 cyl |= sense[29];
240 } else {
241 cyl = sense[29] << 8;
242 cyl |= sense[30];
243 }
244 head = sense[31] & 0x0F;
245 *track = cyl * private->rdc_data.trk_per_cyl + head;
246 return 0;
247 }
248
249 static int set_timestamp(struct ccw1 *ccw, struct DE_eckd_data *data,
250 struct dasd_device *device)
251 {
252 struct dasd_eckd_private *private = device->private;
253 int rc;
254
255 rc = get_phys_clock(&data->ep_sys_time);
256 /*
257 * Ignore return code if XRC is not supported or
258 * sync clock is switched off
259 */
260 if ((rc && !private->rdc_data.facilities.XRC_supported) ||
261 rc == -EOPNOTSUPP || rc == -EACCES)
262 return 0;
263
264 /* switch on System Time Stamp - needed for XRC Support */
265 data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid' */
266 data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
267
268 if (ccw) {
269 ccw->count = sizeof(struct DE_eckd_data);
270 ccw->flags |= CCW_FLAG_SLI;
271 }
272
273 return rc;
274 }
275
276 static int
277 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
278 unsigned int totrk, int cmd, struct dasd_device *device,
279 int blksize)
280 {
281 struct dasd_eckd_private *private = device->private;
282 u16 heads, beghead, endhead;
283 u32 begcyl, endcyl;
284 int rc = 0;
285
286 if (ccw) {
287 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
288 ccw->flags = 0;
289 ccw->count = 16;
290 ccw->cda = (__u32)__pa(data);
291 }
292
293 memset(data, 0, sizeof(struct DE_eckd_data));
294 switch (cmd) {
295 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
296 case DASD_ECKD_CCW_READ_RECORD_ZERO:
297 case DASD_ECKD_CCW_READ:
298 case DASD_ECKD_CCW_READ_MT:
299 case DASD_ECKD_CCW_READ_CKD:
300 case DASD_ECKD_CCW_READ_CKD_MT:
301 case DASD_ECKD_CCW_READ_KD:
302 case DASD_ECKD_CCW_READ_KD_MT:
303 data->mask.perm = 0x1;
304 data->attributes.operation = private->attrib.operation;
305 break;
306 case DASD_ECKD_CCW_READ_COUNT:
307 data->mask.perm = 0x1;
308 data->attributes.operation = DASD_BYPASS_CACHE;
309 break;
310 case DASD_ECKD_CCW_READ_TRACK:
311 case DASD_ECKD_CCW_READ_TRACK_DATA:
312 data->mask.perm = 0x1;
313 data->attributes.operation = private->attrib.operation;
314 data->blk_size = 0;
315 break;
316 case DASD_ECKD_CCW_WRITE:
317 case DASD_ECKD_CCW_WRITE_MT:
318 case DASD_ECKD_CCW_WRITE_KD:
319 case DASD_ECKD_CCW_WRITE_KD_MT:
320 data->mask.perm = 0x02;
321 data->attributes.operation = private->attrib.operation;
322 rc = set_timestamp(ccw, data, device);
323 break;
324 case DASD_ECKD_CCW_WRITE_CKD:
325 case DASD_ECKD_CCW_WRITE_CKD_MT:
326 data->attributes.operation = DASD_BYPASS_CACHE;
327 rc = set_timestamp(ccw, data, device);
328 break;
329 case DASD_ECKD_CCW_ERASE:
330 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
331 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
332 data->mask.perm = 0x3;
333 data->mask.auth = 0x1;
334 data->attributes.operation = DASD_BYPASS_CACHE;
335 rc = set_timestamp(ccw, data, device);
336 break;
337 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
338 data->mask.perm = 0x03;
339 data->attributes.operation = private->attrib.operation;
340 data->blk_size = 0;
341 break;
342 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
343 data->mask.perm = 0x02;
344 data->attributes.operation = private->attrib.operation;
345 data->blk_size = blksize;
346 rc = set_timestamp(ccw, data, device);
347 break;
348 default:
349 dev_err(&device->cdev->dev,
350 "0x%x is not a known command\n", cmd);
351 break;
352 }
353
354 data->attributes.mode = 0x3; /* ECKD */
355
356 if ((private->rdc_data.cu_type == 0x2105 ||
357 private->rdc_data.cu_type == 0x2107 ||
358 private->rdc_data.cu_type == 0x1750)
359 && !(private->uses_cdl && trk < 2))
360 data->ga_extended |= 0x40; /* Regular Data Format Mode */
361
362 heads = private->rdc_data.trk_per_cyl;
363 begcyl = trk / heads;
364 beghead = trk % heads;
365 endcyl = totrk / heads;
366 endhead = totrk % heads;
367
368 /* check for sequential prestage - enhance cylinder range */
369 if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
370 data->attributes.operation == DASD_SEQ_ACCESS) {
371
372 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
373 endcyl += private->attrib.nr_cyl;
374 else
375 endcyl = (private->real_cyl - 1);
376 }
377
378 set_ch_t(&data->beg_ext, begcyl, beghead);
379 set_ch_t(&data->end_ext, endcyl, endhead);
380 return rc;
381 }
382
383
384 static void locate_record_ext(struct ccw1 *ccw, struct LRE_eckd_data *data,
385 unsigned int trk, unsigned int rec_on_trk,
386 int count, int cmd, struct dasd_device *device,
387 unsigned int reclen, unsigned int tlf)
388 {
389 struct dasd_eckd_private *private = device->private;
390 int sector;
391 int dn, d;
392
393 if (ccw) {
394 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD_EXT;
395 ccw->flags = 0;
396 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK)
397 ccw->count = 22;
398 else
399 ccw->count = 20;
400 ccw->cda = (__u32)__pa(data);
401 }
402
403 memset(data, 0, sizeof(*data));
404 sector = 0;
405 if (rec_on_trk) {
406 switch (private->rdc_data.dev_type) {
407 case 0x3390:
408 dn = ceil_quot(reclen + 6, 232);
409 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
410 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
411 break;
412 case 0x3380:
413 d = 7 + ceil_quot(reclen + 12, 32);
414 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
415 break;
416 }
417 }
418 data->sector = sector;
419 /* note: meaning of count depends on the operation
420 * for record based I/O it's the number of records, but for
421 * track based I/O it's the number of tracks
422 */
423 data->count = count;
424 switch (cmd) {
425 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
426 data->operation.orientation = 0x3;
427 data->operation.operation = 0x03;
428 break;
429 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
430 data->operation.orientation = 0x3;
431 data->operation.operation = 0x16;
432 break;
433 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
434 data->operation.orientation = 0x1;
435 data->operation.operation = 0x03;
436 data->count++;
437 break;
438 case DASD_ECKD_CCW_READ_RECORD_ZERO:
439 data->operation.orientation = 0x3;
440 data->operation.operation = 0x16;
441 data->count++;
442 break;
443 case DASD_ECKD_CCW_WRITE:
444 case DASD_ECKD_CCW_WRITE_MT:
445 case DASD_ECKD_CCW_WRITE_KD:
446 case DASD_ECKD_CCW_WRITE_KD_MT:
447 data->auxiliary.length_valid = 0x1;
448 data->length = reclen;
449 data->operation.operation = 0x01;
450 break;
451 case DASD_ECKD_CCW_WRITE_CKD:
452 case DASD_ECKD_CCW_WRITE_CKD_MT:
453 data->auxiliary.length_valid = 0x1;
454 data->length = reclen;
455 data->operation.operation = 0x03;
456 break;
457 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
458 data->operation.orientation = 0x0;
459 data->operation.operation = 0x3F;
460 data->extended_operation = 0x11;
461 data->length = 0;
462 data->extended_parameter_length = 0x02;
463 if (data->count > 8) {
464 data->extended_parameter[0] = 0xFF;
465 data->extended_parameter[1] = 0xFF;
466 data->extended_parameter[1] <<= (16 - count);
467 } else {
468 data->extended_parameter[0] = 0xFF;
469 data->extended_parameter[0] <<= (8 - count);
470 data->extended_parameter[1] = 0x00;
471 }
472 data->sector = 0xFF;
473 break;
474 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
475 data->auxiliary.length_valid = 0x1;
476 data->length = reclen; /* not tlf, as one might think */
477 data->operation.operation = 0x3F;
478 data->extended_operation = 0x23;
479 break;
480 case DASD_ECKD_CCW_READ:
481 case DASD_ECKD_CCW_READ_MT:
482 case DASD_ECKD_CCW_READ_KD:
483 case DASD_ECKD_CCW_READ_KD_MT:
484 data->auxiliary.length_valid = 0x1;
485 data->length = reclen;
486 data->operation.operation = 0x06;
487 break;
488 case DASD_ECKD_CCW_READ_CKD:
489 case DASD_ECKD_CCW_READ_CKD_MT:
490 data->auxiliary.length_valid = 0x1;
491 data->length = reclen;
492 data->operation.operation = 0x16;
493 break;
494 case DASD_ECKD_CCW_READ_COUNT:
495 data->operation.operation = 0x06;
496 break;
497 case DASD_ECKD_CCW_READ_TRACK:
498 data->operation.orientation = 0x1;
499 data->operation.operation = 0x0C;
500 data->extended_parameter_length = 0;
501 data->sector = 0xFF;
502 break;
503 case DASD_ECKD_CCW_READ_TRACK_DATA:
504 data->auxiliary.length_valid = 0x1;
505 data->length = tlf;
506 data->operation.operation = 0x0C;
507 break;
508 case DASD_ECKD_CCW_ERASE:
509 data->length = reclen;
510 data->auxiliary.length_valid = 0x1;
511 data->operation.operation = 0x0b;
512 break;
513 default:
514 DBF_DEV_EVENT(DBF_ERR, device,
515 "fill LRE unknown opcode 0x%x", cmd);
516 BUG();
517 }
518 set_ch_t(&data->seek_addr,
519 trk / private->rdc_data.trk_per_cyl,
520 trk % private->rdc_data.trk_per_cyl);
521 data->search_arg.cyl = data->seek_addr.cyl;
522 data->search_arg.head = data->seek_addr.head;
523 data->search_arg.record = rec_on_trk;
524 }
525
526 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
527 unsigned int trk, unsigned int totrk, int cmd,
528 struct dasd_device *basedev, struct dasd_device *startdev,
529 unsigned int format, unsigned int rec_on_trk, int count,
530 unsigned int blksize, unsigned int tlf)
531 {
532 struct dasd_eckd_private *basepriv, *startpriv;
533 struct LRE_eckd_data *lredata;
534 struct DE_eckd_data *dedata;
535 int rc = 0;
536
537 basepriv = basedev->private;
538 startpriv = startdev->private;
539 dedata = &pfxdata->define_extent;
540 lredata = &pfxdata->locate_record;
541
542 ccw->cmd_code = DASD_ECKD_CCW_PFX;
543 ccw->flags = 0;
544 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
545 ccw->count = sizeof(*pfxdata) + 2;
546 ccw->cda = (__u32) __pa(pfxdata);
547 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
548 } else {
549 ccw->count = sizeof(*pfxdata);
550 ccw->cda = (__u32) __pa(pfxdata);
551 memset(pfxdata, 0, sizeof(*pfxdata));
552 }
553
554 /* prefix data */
555 if (format > 1) {
556 DBF_DEV_EVENT(DBF_ERR, basedev,
557 "PFX LRE unknown format 0x%x", format);
558 BUG();
559 return -EINVAL;
560 }
561 pfxdata->format = format;
562 pfxdata->base_address = basepriv->ned->unit_addr;
563 pfxdata->base_lss = basepriv->ned->ID;
564 pfxdata->validity.define_extent = 1;
565
566 /* private uid is kept up to date, conf_data may be outdated */
567 if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
568 pfxdata->validity.verify_base = 1;
569
570 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
571 pfxdata->validity.verify_base = 1;
572 pfxdata->validity.hyper_pav = 1;
573 }
574
575 rc = define_extent(NULL, dedata, trk, totrk, cmd, basedev, blksize);
576
577 /*
578 * For some commands the System Time Stamp is set in the define extent
579 * data when XRC is supported. The validity of the time stamp must be
580 * reflected in the prefix data as well.
581 */
582 if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
583 pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid' */
584
585 if (format == 1) {
586 locate_record_ext(NULL, lredata, trk, rec_on_trk, count, cmd,
587 basedev, blksize, tlf);
588 }
589
590 return rc;
591 }
592
593 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
594 unsigned int trk, unsigned int totrk, int cmd,
595 struct dasd_device *basedev, struct dasd_device *startdev)
596 {
597 return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
598 0, 0, 0, 0, 0);
599 }
600
601 static void
602 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
603 unsigned int rec_on_trk, int no_rec, int cmd,
604 struct dasd_device * device, int reclen)
605 {
606 struct dasd_eckd_private *private = device->private;
607 int sector;
608 int dn, d;
609
610 DBF_DEV_EVENT(DBF_INFO, device,
611 "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
612 trk, rec_on_trk, no_rec, cmd, reclen);
613
614 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
615 ccw->flags = 0;
616 ccw->count = 16;
617 ccw->cda = (__u32) __pa(data);
618
619 memset(data, 0, sizeof(struct LO_eckd_data));
620 sector = 0;
621 if (rec_on_trk) {
622 switch (private->rdc_data.dev_type) {
623 case 0x3390:
624 dn = ceil_quot(reclen + 6, 232);
625 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
626 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
627 break;
628 case 0x3380:
629 d = 7 + ceil_quot(reclen + 12, 32);
630 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
631 break;
632 }
633 }
634 data->sector = sector;
635 data->count = no_rec;
636 switch (cmd) {
637 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
638 data->operation.orientation = 0x3;
639 data->operation.operation = 0x03;
640 break;
641 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
642 data->operation.orientation = 0x3;
643 data->operation.operation = 0x16;
644 break;
645 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
646 data->operation.orientation = 0x1;
647 data->operation.operation = 0x03;
648 data->count++;
649 break;
650 case DASD_ECKD_CCW_READ_RECORD_ZERO:
651 data->operation.orientation = 0x3;
652 data->operation.operation = 0x16;
653 data->count++;
654 break;
655 case DASD_ECKD_CCW_WRITE:
656 case DASD_ECKD_CCW_WRITE_MT:
657 case DASD_ECKD_CCW_WRITE_KD:
658 case DASD_ECKD_CCW_WRITE_KD_MT:
659 data->auxiliary.last_bytes_used = 0x1;
660 data->length = reclen;
661 data->operation.operation = 0x01;
662 break;
663 case DASD_ECKD_CCW_WRITE_CKD:
664 case DASD_ECKD_CCW_WRITE_CKD_MT:
665 data->auxiliary.last_bytes_used = 0x1;
666 data->length = reclen;
667 data->operation.operation = 0x03;
668 break;
669 case DASD_ECKD_CCW_READ:
670 case DASD_ECKD_CCW_READ_MT:
671 case DASD_ECKD_CCW_READ_KD:
672 case DASD_ECKD_CCW_READ_KD_MT:
673 data->auxiliary.last_bytes_used = 0x1;
674 data->length = reclen;
675 data->operation.operation = 0x06;
676 break;
677 case DASD_ECKD_CCW_READ_CKD:
678 case DASD_ECKD_CCW_READ_CKD_MT:
679 data->auxiliary.last_bytes_used = 0x1;
680 data->length = reclen;
681 data->operation.operation = 0x16;
682 break;
683 case DASD_ECKD_CCW_READ_COUNT:
684 data->operation.operation = 0x06;
685 break;
686 case DASD_ECKD_CCW_ERASE:
687 data->length = reclen;
688 data->auxiliary.last_bytes_used = 0x1;
689 data->operation.operation = 0x0b;
690 break;
691 default:
692 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
693 "opcode 0x%x", cmd);
694 }
695 set_ch_t(&data->seek_addr,
696 trk / private->rdc_data.trk_per_cyl,
697 trk % private->rdc_data.trk_per_cyl);
698 data->search_arg.cyl = data->seek_addr.cyl;
699 data->search_arg.head = data->seek_addr.head;
700 data->search_arg.record = rec_on_trk;
701 }
702
703 /*
704 * Returns 1 if the block is one of the special blocks that needs
705 * to get read/written with the KD variant of the command.
706 * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
707 * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
708 * Luckily the KD variants differ only by one bit (0x08) from the
709 * normal variant. So don't wonder about code like:
710 * if (dasd_eckd_cdl_special(blk_per_trk, recid))
711 * ccw->cmd_code |= 0x8;
712 */
713 static inline int
714 dasd_eckd_cdl_special(int blk_per_trk, int recid)
715 {
716 if (recid < 3)
717 return 1;
718 if (recid < blk_per_trk)
719 return 0;
720 if (recid < 2 * blk_per_trk)
721 return 1;
722 return 0;
723 }
724
725 /*
726 * Returns the record size for the special blocks of the cdl format.
727 * Only returns something useful if dasd_eckd_cdl_special is true
728 * for the recid.
729 */
730 static inline int
731 dasd_eckd_cdl_reclen(int recid)
732 {
733 if (recid < 3)
734 return sizes_trk0[recid];
735 return LABEL_SIZE;
736 }
737 /* create unique id from private structure. */
738 static void create_uid(struct dasd_eckd_private *private)
739 {
740 int count;
741 struct dasd_uid *uid;
742
743 uid = &private->uid;
744 memset(uid, 0, sizeof(struct dasd_uid));
745 memcpy(uid->vendor, private->ned->HDA_manufacturer,
746 sizeof(uid->vendor) - 1);
747 EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
748 memcpy(uid->serial, private->ned->HDA_location,
749 sizeof(uid->serial) - 1);
750 EBCASC(uid->serial, sizeof(uid->serial) - 1);
751 uid->ssid = private->gneq->subsystemID;
752 uid->real_unit_addr = private->ned->unit_addr;
753 if (private->sneq) {
754 uid->type = private->sneq->sua_flags;
755 if (uid->type == UA_BASE_PAV_ALIAS)
756 uid->base_unit_addr = private->sneq->base_unit_addr;
757 } else {
758 uid->type = UA_BASE_DEVICE;
759 }
760 if (private->vdsneq) {
761 for (count = 0; count < 16; count++) {
762 sprintf(uid->vduit+2*count, "%02x",
763 private->vdsneq->uit[count]);
764 }
765 }
766 }
767
768 /*
769 * Generate device unique id that specifies the physical device.
770 */
771 static int dasd_eckd_generate_uid(struct dasd_device *device)
772 {
773 struct dasd_eckd_private *private = device->private;
774 unsigned long flags;
775
776 if (!private)
777 return -ENODEV;
778 if (!private->ned || !private->gneq)
779 return -ENODEV;
780 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
781 create_uid(private);
782 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
783 return 0;
784 }
785
786 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
787 {
788 struct dasd_eckd_private *private = device->private;
789 unsigned long flags;
790
791 if (private) {
792 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
793 *uid = private->uid;
794 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
795 return 0;
796 }
797 return -EINVAL;
798 }
799
800 /*
801 * compare device UID with data of a given dasd_eckd_private structure
802 * return 0 for match
803 */
804 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
805 struct dasd_eckd_private *private)
806 {
807 struct dasd_uid device_uid;
808
809 create_uid(private);
810 dasd_eckd_get_uid(device, &device_uid);
811
812 return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
813 }
814
815 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
816 struct dasd_ccw_req *cqr,
817 __u8 *rcd_buffer,
818 __u8 lpm)
819 {
820 struct ccw1 *ccw;
821 /*
822 * buffer has to start with EBCDIC "V1.0" to show
823 * support for virtual device SNEQ
824 */
825 rcd_buffer[0] = 0xE5;
826 rcd_buffer[1] = 0xF1;
827 rcd_buffer[2] = 0x4B;
828 rcd_buffer[3] = 0xF0;
829
830 ccw = cqr->cpaddr;
831 ccw->cmd_code = DASD_ECKD_CCW_RCD;
832 ccw->flags = 0;
833 ccw->cda = (__u32)(addr_t)rcd_buffer;
834 ccw->count = DASD_ECKD_RCD_DATA_SIZE;
835 cqr->magic = DASD_ECKD_MAGIC;
836
837 cqr->startdev = device;
838 cqr->memdev = device;
839 cqr->block = NULL;
840 cqr->expires = 10*HZ;
841 cqr->lpm = lpm;
842 cqr->retries = 256;
843 cqr->buildclk = get_tod_clock();
844 cqr->status = DASD_CQR_FILLED;
845 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
846 }
847
848 /*
849 * Wakeup helper for read_conf
850 * if the cqr is not done and needs some error recovery
851 * the buffer has to be re-initialized with the EBCDIC "V1.0"
852 * to show support for virtual device SNEQ
853 */
854 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
855 {
856 struct ccw1 *ccw;
857 __u8 *rcd_buffer;
858
859 if (cqr->status != DASD_CQR_DONE) {
860 ccw = cqr->cpaddr;
861 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
862 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
863
864 rcd_buffer[0] = 0xE5;
865 rcd_buffer[1] = 0xF1;
866 rcd_buffer[2] = 0x4B;
867 rcd_buffer[3] = 0xF0;
868 }
869 dasd_wakeup_cb(cqr, data);
870 }
871
872 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
873 struct dasd_ccw_req *cqr,
874 __u8 *rcd_buffer,
875 __u8 lpm)
876 {
877 struct ciw *ciw;
878 int rc;
879 /*
880 * sanity check: scan for RCD command in extended SenseID data
881 * some devices do not support RCD
882 */
883 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
884 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
885 return -EOPNOTSUPP;
886
887 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
888 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
889 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
890 cqr->retries = 5;
891 cqr->callback = read_conf_cb;
892 rc = dasd_sleep_on_immediatly(cqr);
893 return rc;
894 }
895
896 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
897 void **rcd_buffer,
898 int *rcd_buffer_size, __u8 lpm)
899 {
900 struct ciw *ciw;
901 char *rcd_buf = NULL;
902 int ret;
903 struct dasd_ccw_req *cqr;
904
905 /*
906 * sanity check: scan for RCD command in extended SenseID data
907 * some devices do not support RCD
908 */
909 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
910 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
911 ret = -EOPNOTSUPP;
912 goto out_error;
913 }
914 rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
915 if (!rcd_buf) {
916 ret = -ENOMEM;
917 goto out_error;
918 }
919 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
920 0, /* use rcd_buf as data ara */
921 device, NULL);
922 if (IS_ERR(cqr)) {
923 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
924 "Could not allocate RCD request");
925 ret = -ENOMEM;
926 goto out_error;
927 }
928 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
929 cqr->callback = read_conf_cb;
930 ret = dasd_sleep_on(cqr);
931 /*
932 * on success we update the user input parms
933 */
934 dasd_sfree_request(cqr, cqr->memdev);
935 if (ret)
936 goto out_error;
937
938 *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
939 *rcd_buffer = rcd_buf;
940 return 0;
941 out_error:
942 kfree(rcd_buf);
943 *rcd_buffer = NULL;
944 *rcd_buffer_size = 0;
945 return ret;
946 }
947
948 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
949 {
950
951 struct dasd_sneq *sneq;
952 int i, count;
953
954 private->ned = NULL;
955 private->sneq = NULL;
956 private->vdsneq = NULL;
957 private->gneq = NULL;
958 count = private->conf_len / sizeof(struct dasd_sneq);
959 sneq = (struct dasd_sneq *)private->conf_data;
960 for (i = 0; i < count; ++i) {
961 if (sneq->flags.identifier == 1 && sneq->format == 1)
962 private->sneq = sneq;
963 else if (sneq->flags.identifier == 1 && sneq->format == 4)
964 private->vdsneq = (struct vd_sneq *)sneq;
965 else if (sneq->flags.identifier == 2)
966 private->gneq = (struct dasd_gneq *)sneq;
967 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
968 private->ned = (struct dasd_ned *)sneq;
969 sneq++;
970 }
971 if (!private->ned || !private->gneq) {
972 private->ned = NULL;
973 private->sneq = NULL;
974 private->vdsneq = NULL;
975 private->gneq = NULL;
976 return -EINVAL;
977 }
978 return 0;
979
980 };
981
982 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
983 {
984 struct dasd_gneq *gneq;
985 int i, count, found;
986
987 count = conf_len / sizeof(*gneq);
988 gneq = (struct dasd_gneq *)conf_data;
989 found = 0;
990 for (i = 0; i < count; ++i) {
991 if (gneq->flags.identifier == 2) {
992 found = 1;
993 break;
994 }
995 gneq++;
996 }
997 if (found)
998 return ((char *)gneq)[18] & 0x07;
999 else
1000 return 0;
1001 }
1002
1003 static void dasd_eckd_clear_conf_data(struct dasd_device *device)
1004 {
1005 struct dasd_eckd_private *private = device->private;
1006 int i;
1007
1008 private->conf_data = NULL;
1009 private->conf_len = 0;
1010 for (i = 0; i < 8; i++) {
1011 kfree(device->path[i].conf_data);
1012 device->path[i].conf_data = NULL;
1013 device->path[i].cssid = 0;
1014 device->path[i].ssid = 0;
1015 device->path[i].chpid = 0;
1016 }
1017 }
1018
1019
1020 static int dasd_eckd_read_conf(struct dasd_device *device)
1021 {
1022 void *conf_data;
1023 int conf_len, conf_data_saved;
1024 int rc, path_err, pos;
1025 __u8 lpm, opm;
1026 struct dasd_eckd_private *private, path_private;
1027 struct dasd_uid *uid;
1028 char print_path_uid[60], print_device_uid[60];
1029 struct channel_path_desc_fmt0 *chp_desc;
1030 struct subchannel_id sch_id;
1031
1032 private = device->private;
1033 opm = ccw_device_get_path_mask(device->cdev);
1034 ccw_device_get_schid(device->cdev, &sch_id);
1035 conf_data_saved = 0;
1036 path_err = 0;
1037 /* get configuration data per operational path */
1038 for (lpm = 0x80; lpm; lpm>>= 1) {
1039 if (!(lpm & opm))
1040 continue;
1041 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1042 &conf_len, lpm);
1043 if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */
1044 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1045 "Read configuration data returned "
1046 "error %d", rc);
1047 return rc;
1048 }
1049 if (conf_data == NULL) {
1050 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1051 "No configuration data "
1052 "retrieved");
1053 /* no further analysis possible */
1054 dasd_path_add_opm(device, opm);
1055 continue; /* no error */
1056 }
1057 /* save first valid configuration data */
1058 if (!conf_data_saved) {
1059 /* initially clear previously stored conf_data */
1060 dasd_eckd_clear_conf_data(device);
1061 private->conf_data = conf_data;
1062 private->conf_len = conf_len;
1063 if (dasd_eckd_identify_conf_parts(private)) {
1064 private->conf_data = NULL;
1065 private->conf_len = 0;
1066 kfree(conf_data);
1067 continue;
1068 }
1069 pos = pathmask_to_pos(lpm);
1070 /* store per path conf_data */
1071 device->path[pos].conf_data = conf_data;
1072 device->path[pos].cssid = sch_id.cssid;
1073 device->path[pos].ssid = sch_id.ssid;
1074 chp_desc = ccw_device_get_chp_desc(device->cdev, pos);
1075 if (chp_desc)
1076 device->path[pos].chpid = chp_desc->chpid;
1077 kfree(chp_desc);
1078 /*
1079 * build device UID that other path data
1080 * can be compared to it
1081 */
1082 dasd_eckd_generate_uid(device);
1083 conf_data_saved++;
1084 } else {
1085 path_private.conf_data = conf_data;
1086 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1087 if (dasd_eckd_identify_conf_parts(
1088 &path_private)) {
1089 path_private.conf_data = NULL;
1090 path_private.conf_len = 0;
1091 kfree(conf_data);
1092 continue;
1093 }
1094 if (dasd_eckd_compare_path_uid(
1095 device, &path_private)) {
1096 uid = &path_private.uid;
1097 if (strlen(uid->vduit) > 0)
1098 snprintf(print_path_uid,
1099 sizeof(print_path_uid),
1100 "%s.%s.%04x.%02x.%s",
1101 uid->vendor, uid->serial,
1102 uid->ssid, uid->real_unit_addr,
1103 uid->vduit);
1104 else
1105 snprintf(print_path_uid,
1106 sizeof(print_path_uid),
1107 "%s.%s.%04x.%02x",
1108 uid->vendor, uid->serial,
1109 uid->ssid,
1110 uid->real_unit_addr);
1111 uid = &private->uid;
1112 if (strlen(uid->vduit) > 0)
1113 snprintf(print_device_uid,
1114 sizeof(print_device_uid),
1115 "%s.%s.%04x.%02x.%s",
1116 uid->vendor, uid->serial,
1117 uid->ssid, uid->real_unit_addr,
1118 uid->vduit);
1119 else
1120 snprintf(print_device_uid,
1121 sizeof(print_device_uid),
1122 "%s.%s.%04x.%02x",
1123 uid->vendor, uid->serial,
1124 uid->ssid,
1125 uid->real_unit_addr);
1126 dev_err(&device->cdev->dev,
1127 "Not all channel paths lead to "
1128 "the same device, path %02X leads to "
1129 "device %s instead of %s\n", lpm,
1130 print_path_uid, print_device_uid);
1131 path_err = -EINVAL;
1132 dasd_path_add_cablepm(device, lpm);
1133 continue;
1134 }
1135 pos = pathmask_to_pos(lpm);
1136 /* store per path conf_data */
1137 device->path[pos].conf_data = conf_data;
1138 device->path[pos].cssid = sch_id.cssid;
1139 device->path[pos].ssid = sch_id.ssid;
1140 chp_desc = ccw_device_get_chp_desc(device->cdev, pos);
1141 if (chp_desc)
1142 device->path[pos].chpid = chp_desc->chpid;
1143 kfree(chp_desc);
1144 path_private.conf_data = NULL;
1145 path_private.conf_len = 0;
1146 }
1147 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1148 case 0x02:
1149 dasd_path_add_nppm(device, lpm);
1150 break;
1151 case 0x03:
1152 dasd_path_add_ppm(device, lpm);
1153 break;
1154 }
1155 if (!dasd_path_get_opm(device)) {
1156 dasd_path_set_opm(device, lpm);
1157 dasd_generic_path_operational(device);
1158 } else {
1159 dasd_path_add_opm(device, lpm);
1160 }
1161 }
1162
1163 return path_err;
1164 }
1165
1166 static u32 get_fcx_max_data(struct dasd_device *device)
1167 {
1168 struct dasd_eckd_private *private = device->private;
1169 int fcx_in_css, fcx_in_gneq, fcx_in_features;
1170 unsigned int mdc;
1171 int tpm;
1172
1173 if (dasd_nofcx)
1174 return 0;
1175 /* is transport mode supported? */
1176 fcx_in_css = css_general_characteristics.fcx;
1177 fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1178 fcx_in_features = private->features.feature[40] & 0x80;
1179 tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1180
1181 if (!tpm)
1182 return 0;
1183
1184 mdc = ccw_device_get_mdc(device->cdev, 0);
1185 if (mdc == 0) {
1186 dev_warn(&device->cdev->dev, "Detecting the maximum supported data size for zHPF requests failed\n");
1187 return 0;
1188 } else {
1189 return (u32)mdc * FCX_MAX_DATA_FACTOR;
1190 }
1191 }
1192
1193 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1194 {
1195 struct dasd_eckd_private *private = device->private;
1196 unsigned int mdc;
1197 u32 fcx_max_data;
1198
1199 if (private->fcx_max_data) {
1200 mdc = ccw_device_get_mdc(device->cdev, lpm);
1201 if (mdc == 0) {
1202 dev_warn(&device->cdev->dev,
1203 "Detecting the maximum data size for zHPF "
1204 "requests failed (rc=%d) for a new path %x\n",
1205 mdc, lpm);
1206 return mdc;
1207 }
1208 fcx_max_data = (u32)mdc * FCX_MAX_DATA_FACTOR;
1209 if (fcx_max_data < private->fcx_max_data) {
1210 dev_warn(&device->cdev->dev,
1211 "The maximum data size for zHPF requests %u "
1212 "on a new path %x is below the active maximum "
1213 "%u\n", fcx_max_data, lpm,
1214 private->fcx_max_data);
1215 return -EACCES;
1216 }
1217 }
1218 return 0;
1219 }
1220
1221 static int rebuild_device_uid(struct dasd_device *device,
1222 struct path_verification_work_data *data)
1223 {
1224 struct dasd_eckd_private *private = device->private;
1225 __u8 lpm, opm = dasd_path_get_opm(device);
1226 int rc = -ENODEV;
1227
1228 for (lpm = 0x80; lpm; lpm >>= 1) {
1229 if (!(lpm & opm))
1230 continue;
1231 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1232 memset(&data->cqr, 0, sizeof(data->cqr));
1233 data->cqr.cpaddr = &data->ccw;
1234 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1235 data->rcd_buffer,
1236 lpm);
1237
1238 if (rc) {
1239 if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1240 continue;
1241 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1242 "Read configuration data "
1243 "returned error %d", rc);
1244 break;
1245 }
1246 memcpy(private->conf_data, data->rcd_buffer,
1247 DASD_ECKD_RCD_DATA_SIZE);
1248 if (dasd_eckd_identify_conf_parts(private)) {
1249 rc = -ENODEV;
1250 } else /* first valid path is enough */
1251 break;
1252 }
1253
1254 if (!rc)
1255 rc = dasd_eckd_generate_uid(device);
1256
1257 return rc;
1258 }
1259
1260 static void do_path_verification_work(struct work_struct *work)
1261 {
1262 struct path_verification_work_data *data;
1263 struct dasd_device *device;
1264 struct dasd_eckd_private path_private;
1265 struct dasd_uid *uid;
1266 __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1267 __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1268 unsigned long flags;
1269 char print_uid[60];
1270 int rc;
1271
1272 data = container_of(work, struct path_verification_work_data, worker);
1273 device = data->device;
1274
1275 /* delay path verification until device was resumed */
1276 if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1277 schedule_work(work);
1278 return;
1279 }
1280 /* check if path verification already running and delay if so */
1281 if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
1282 schedule_work(work);
1283 return;
1284 }
1285 opm = 0;
1286 npm = 0;
1287 ppm = 0;
1288 epm = 0;
1289 hpfpm = 0;
1290 cablepm = 0;
1291
1292 for (lpm = 0x80; lpm; lpm >>= 1) {
1293 if (!(lpm & data->tbvpm))
1294 continue;
1295 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1296 memset(&data->cqr, 0, sizeof(data->cqr));
1297 data->cqr.cpaddr = &data->ccw;
1298 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1299 data->rcd_buffer,
1300 lpm);
1301 if (!rc) {
1302 switch (dasd_eckd_path_access(data->rcd_buffer,
1303 DASD_ECKD_RCD_DATA_SIZE)
1304 ) {
1305 case 0x02:
1306 npm |= lpm;
1307 break;
1308 case 0x03:
1309 ppm |= lpm;
1310 break;
1311 }
1312 opm |= lpm;
1313 } else if (rc == -EOPNOTSUPP) {
1314 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1315 "path verification: No configuration "
1316 "data retrieved");
1317 opm |= lpm;
1318 } else if (rc == -EAGAIN) {
1319 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1320 "path verification: device is stopped,"
1321 " try again later");
1322 epm |= lpm;
1323 } else {
1324 dev_warn(&device->cdev->dev,
1325 "Reading device feature codes failed "
1326 "(rc=%d) for new path %x\n", rc, lpm);
1327 continue;
1328 }
1329 if (verify_fcx_max_data(device, lpm)) {
1330 opm &= ~lpm;
1331 npm &= ~lpm;
1332 ppm &= ~lpm;
1333 hpfpm |= lpm;
1334 continue;
1335 }
1336
1337 /*
1338 * save conf_data for comparison after
1339 * rebuild_device_uid may have changed
1340 * the original data
1341 */
1342 memcpy(&path_rcd_buf, data->rcd_buffer,
1343 DASD_ECKD_RCD_DATA_SIZE);
1344 path_private.conf_data = (void *) &path_rcd_buf;
1345 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1346 if (dasd_eckd_identify_conf_parts(&path_private)) {
1347 path_private.conf_data = NULL;
1348 path_private.conf_len = 0;
1349 continue;
1350 }
1351
1352 /*
1353 * compare path UID with device UID only if at least
1354 * one valid path is left
1355 * in other case the device UID may have changed and
1356 * the first working path UID will be used as device UID
1357 */
1358 if (dasd_path_get_opm(device) &&
1359 dasd_eckd_compare_path_uid(device, &path_private)) {
1360 /*
1361 * the comparison was not successful
1362 * rebuild the device UID with at least one
1363 * known path in case a z/VM hyperswap command
1364 * has changed the device
1365 *
1366 * after this compare again
1367 *
1368 * if either the rebuild or the recompare fails
1369 * the path can not be used
1370 */
1371 if (rebuild_device_uid(device, data) ||
1372 dasd_eckd_compare_path_uid(
1373 device, &path_private)) {
1374 uid = &path_private.uid;
1375 if (strlen(uid->vduit) > 0)
1376 snprintf(print_uid, sizeof(print_uid),
1377 "%s.%s.%04x.%02x.%s",
1378 uid->vendor, uid->serial,
1379 uid->ssid, uid->real_unit_addr,
1380 uid->vduit);
1381 else
1382 snprintf(print_uid, sizeof(print_uid),
1383 "%s.%s.%04x.%02x",
1384 uid->vendor, uid->serial,
1385 uid->ssid,
1386 uid->real_unit_addr);
1387 dev_err(&device->cdev->dev,
1388 "The newly added channel path %02X "
1389 "will not be used because it leads "
1390 "to a different device %s\n",
1391 lpm, print_uid);
1392 opm &= ~lpm;
1393 npm &= ~lpm;
1394 ppm &= ~lpm;
1395 cablepm |= lpm;
1396 continue;
1397 }
1398 }
1399
1400 /*
1401 * There is a small chance that a path is lost again between
1402 * above path verification and the following modification of
1403 * the device opm mask. We could avoid that race here by using
1404 * yet another path mask, but we rather deal with this unlikely
1405 * situation in dasd_start_IO.
1406 */
1407 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1408 if (!dasd_path_get_opm(device) && opm) {
1409 dasd_path_set_opm(device, opm);
1410 dasd_generic_path_operational(device);
1411 } else {
1412 dasd_path_add_opm(device, opm);
1413 }
1414 dasd_path_add_nppm(device, npm);
1415 dasd_path_add_ppm(device, ppm);
1416 dasd_path_add_tbvpm(device, epm);
1417 dasd_path_add_cablepm(device, cablepm);
1418 dasd_path_add_nohpfpm(device, hpfpm);
1419 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1420 }
1421 clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
1422 dasd_put_device(device);
1423 if (data->isglobal)
1424 mutex_unlock(&dasd_path_verification_mutex);
1425 else
1426 kfree(data);
1427 }
1428
1429 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1430 {
1431 struct path_verification_work_data *data;
1432
1433 data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1434 if (!data) {
1435 if (mutex_trylock(&dasd_path_verification_mutex)) {
1436 data = path_verification_worker;
1437 data->isglobal = 1;
1438 } else
1439 return -ENOMEM;
1440 } else {
1441 memset(data, 0, sizeof(*data));
1442 data->isglobal = 0;
1443 }
1444 INIT_WORK(&data->worker, do_path_verification_work);
1445 dasd_get_device(device);
1446 data->device = device;
1447 data->tbvpm = lpm;
1448 schedule_work(&data->worker);
1449 return 0;
1450 }
1451
1452 static void dasd_eckd_reset_path(struct dasd_device *device, __u8 pm)
1453 {
1454 struct dasd_eckd_private *private = device->private;
1455 unsigned long flags;
1456
1457 if (!private->fcx_max_data)
1458 private->fcx_max_data = get_fcx_max_data(device);
1459 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1460 dasd_path_set_tbvpm(device, pm ? : dasd_path_get_notoperpm(device));
1461 dasd_schedule_device_bh(device);
1462 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1463 }
1464
1465 static int dasd_eckd_read_features(struct dasd_device *device)
1466 {
1467 struct dasd_eckd_private *private = device->private;
1468 struct dasd_psf_prssd_data *prssdp;
1469 struct dasd_rssd_features *features;
1470 struct dasd_ccw_req *cqr;
1471 struct ccw1 *ccw;
1472 int rc;
1473
1474 memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1475 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1476 (sizeof(struct dasd_psf_prssd_data) +
1477 sizeof(struct dasd_rssd_features)),
1478 device, NULL);
1479 if (IS_ERR(cqr)) {
1480 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1481 "allocate initialization request");
1482 return PTR_ERR(cqr);
1483 }
1484 cqr->startdev = device;
1485 cqr->memdev = device;
1486 cqr->block = NULL;
1487 cqr->retries = 256;
1488 cqr->expires = 10 * HZ;
1489
1490 /* Prepare for Read Subsystem Data */
1491 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1492 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1493 prssdp->order = PSF_ORDER_PRSSD;
1494 prssdp->suborder = 0x41; /* Read Feature Codes */
1495 /* all other bytes of prssdp must be zero */
1496
1497 ccw = cqr->cpaddr;
1498 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1499 ccw->count = sizeof(struct dasd_psf_prssd_data);
1500 ccw->flags |= CCW_FLAG_CC;
1501 ccw->cda = (__u32)(addr_t) prssdp;
1502
1503 /* Read Subsystem Data - feature codes */
1504 features = (struct dasd_rssd_features *) (prssdp + 1);
1505 memset(features, 0, sizeof(struct dasd_rssd_features));
1506
1507 ccw++;
1508 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1509 ccw->count = sizeof(struct dasd_rssd_features);
1510 ccw->cda = (__u32)(addr_t) features;
1511
1512 cqr->buildclk = get_tod_clock();
1513 cqr->status = DASD_CQR_FILLED;
1514 rc = dasd_sleep_on(cqr);
1515 if (rc == 0) {
1516 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1517 features = (struct dasd_rssd_features *) (prssdp + 1);
1518 memcpy(&private->features, features,
1519 sizeof(struct dasd_rssd_features));
1520 } else
1521 dev_warn(&device->cdev->dev, "Reading device feature codes"
1522 " failed with rc=%d\n", rc);
1523 dasd_sfree_request(cqr, cqr->memdev);
1524 return rc;
1525 }
1526
1527 /* Read Volume Information - Volume Storage Query */
1528 static int dasd_eckd_read_vol_info(struct dasd_device *device)
1529 {
1530 struct dasd_eckd_private *private = device->private;
1531 struct dasd_psf_prssd_data *prssdp;
1532 struct dasd_rssd_vsq *vsq;
1533 struct dasd_ccw_req *cqr;
1534 struct ccw1 *ccw;
1535 int useglobal;
1536 int rc;
1537
1538 /* This command cannot be executed on an alias device */
1539 if (private->uid.type == UA_BASE_PAV_ALIAS ||
1540 private->uid.type == UA_HYPER_PAV_ALIAS)
1541 return 0;
1542
1543 useglobal = 0;
1544 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 /* PSF + RSSD */,
1545 sizeof(*prssdp) + sizeof(*vsq), device, NULL);
1546 if (IS_ERR(cqr)) {
1547 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1548 "Could not allocate initialization request");
1549 mutex_lock(&dasd_vol_info_mutex);
1550 useglobal = 1;
1551 cqr = &dasd_vol_info_req->cqr;
1552 memset(cqr, 0, sizeof(*cqr));
1553 memset(dasd_vol_info_req, 0, sizeof(*dasd_vol_info_req));
1554 cqr->cpaddr = &dasd_vol_info_req->ccw;
1555 cqr->data = &dasd_vol_info_req->data;
1556 cqr->magic = DASD_ECKD_MAGIC;
1557 }
1558
1559 /* Prepare for Read Subsystem Data */
1560 prssdp = cqr->data;
1561 prssdp->order = PSF_ORDER_PRSSD;
1562 prssdp->suborder = PSF_SUBORDER_VSQ; /* Volume Storage Query */
1563 prssdp->lss = private->ned->ID;
1564 prssdp->volume = private->ned->unit_addr;
1565
1566 ccw = cqr->cpaddr;
1567 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1568 ccw->count = sizeof(*prssdp);
1569 ccw->flags |= CCW_FLAG_CC;
1570 ccw->cda = (__u32)(addr_t)prssdp;
1571
1572 /* Read Subsystem Data - Volume Storage Query */
1573 vsq = (struct dasd_rssd_vsq *)(prssdp + 1);
1574 memset(vsq, 0, sizeof(*vsq));
1575
1576 ccw++;
1577 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1578 ccw->count = sizeof(*vsq);
1579 ccw->flags |= CCW_FLAG_SLI;
1580 ccw->cda = (__u32)(addr_t)vsq;
1581
1582 cqr->buildclk = get_tod_clock();
1583 cqr->status = DASD_CQR_FILLED;
1584 cqr->startdev = device;
1585 cqr->memdev = device;
1586 cqr->block = NULL;
1587 cqr->retries = 256;
1588 cqr->expires = device->default_expires * HZ;
1589 /* The command might not be supported. Suppress the error output */
1590 __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
1591
1592 rc = dasd_sleep_on_interruptible(cqr);
1593 if (rc == 0) {
1594 memcpy(&private->vsq, vsq, sizeof(*vsq));
1595 } else {
1596 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1597 "Reading the volume storage information failed with rc=%d", rc);
1598 }
1599
1600 if (useglobal)
1601 mutex_unlock(&dasd_vol_info_mutex);
1602 else
1603 dasd_sfree_request(cqr, cqr->memdev);
1604
1605 return rc;
1606 }
1607
1608 static int dasd_eckd_is_ese(struct dasd_device *device)
1609 {
1610 struct dasd_eckd_private *private = device->private;
1611
1612 return private->vsq.vol_info.ese;
1613 }
1614
1615 static int dasd_eckd_ext_pool_id(struct dasd_device *device)
1616 {
1617 struct dasd_eckd_private *private = device->private;
1618
1619 return private->vsq.extent_pool_id;
1620 }
1621
1622 /*
1623 * This value represents the total amount of available space. As more space is
1624 * allocated by ESE volumes, this value will decrease.
1625 * The data for this value is therefore updated on any call.
1626 */
1627 static int dasd_eckd_space_configured(struct dasd_device *device)
1628 {
1629 struct dasd_eckd_private *private = device->private;
1630 int rc;
1631
1632 rc = dasd_eckd_read_vol_info(device);
1633
1634 return rc ? : private->vsq.space_configured;
1635 }
1636
1637 /*
1638 * The value of space allocated by an ESE volume may have changed and is
1639 * therefore updated on any call.
1640 */
1641 static int dasd_eckd_space_allocated(struct dasd_device *device)
1642 {
1643 struct dasd_eckd_private *private = device->private;
1644 int rc;
1645
1646 rc = dasd_eckd_read_vol_info(device);
1647
1648 return rc ? : private->vsq.space_allocated;
1649 }
1650
1651 static int dasd_eckd_logical_capacity(struct dasd_device *device)
1652 {
1653 struct dasd_eckd_private *private = device->private;
1654
1655 return private->vsq.logical_capacity;
1656 }
1657
1658 static void dasd_eckd_ext_pool_exhaust_work(struct work_struct *work)
1659 {
1660 struct ext_pool_exhaust_work_data *data;
1661 struct dasd_device *device;
1662 struct dasd_device *base;
1663
1664 data = container_of(work, struct ext_pool_exhaust_work_data, worker);
1665 device = data->device;
1666 base = data->base;
1667
1668 if (!base)
1669 base = device;
1670 if (dasd_eckd_space_configured(base) != 0) {
1671 dasd_generic_space_avail(device);
1672 } else {
1673 dev_warn(&device->cdev->dev, "No space left in the extent pool\n");
1674 DBF_DEV_EVENT(DBF_WARNING, device, "%s", "out of space");
1675 }
1676
1677 dasd_put_device(device);
1678 kfree(data);
1679 }
1680
1681 static int dasd_eckd_ext_pool_exhaust(struct dasd_device *device,
1682 struct dasd_ccw_req *cqr)
1683 {
1684 struct ext_pool_exhaust_work_data *data;
1685
1686 data = kzalloc(sizeof(*data), GFP_ATOMIC);
1687 if (!data)
1688 return -ENOMEM;
1689 INIT_WORK(&data->worker, dasd_eckd_ext_pool_exhaust_work);
1690 dasd_get_device(device);
1691 data->device = device;
1692
1693 if (cqr->block)
1694 data->base = cqr->block->base;
1695 else if (cqr->basedev)
1696 data->base = cqr->basedev;
1697 else
1698 data->base = NULL;
1699
1700 schedule_work(&data->worker);
1701
1702 return 0;
1703 }
1704
1705 static void dasd_eckd_cpy_ext_pool_data(struct dasd_device *device,
1706 struct dasd_rssd_lcq *lcq)
1707 {
1708 struct dasd_eckd_private *private = device->private;
1709 int pool_id = dasd_eckd_ext_pool_id(device);
1710 struct dasd_ext_pool_sum eps;
1711 int i;
1712
1713 for (i = 0; i < lcq->pool_count; i++) {
1714 eps = lcq->ext_pool_sum[i];
1715 if (eps.pool_id == pool_id) {
1716 memcpy(&private->eps, &eps,
1717 sizeof(struct dasd_ext_pool_sum));
1718 }
1719 }
1720 }
1721
1722 /* Read Extent Pool Information - Logical Configuration Query */
1723 static int dasd_eckd_read_ext_pool_info(struct dasd_device *device)
1724 {
1725 struct dasd_eckd_private *private = device->private;
1726 struct dasd_psf_prssd_data *prssdp;
1727 struct dasd_rssd_lcq *lcq;
1728 struct dasd_ccw_req *cqr;
1729 struct ccw1 *ccw;
1730 int rc;
1731
1732 /* This command cannot be executed on an alias device */
1733 if (private->uid.type == UA_BASE_PAV_ALIAS ||
1734 private->uid.type == UA_HYPER_PAV_ALIAS)
1735 return 0;
1736
1737 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 /* PSF + RSSD */,
1738 sizeof(*prssdp) + sizeof(*lcq), device, NULL);
1739 if (IS_ERR(cqr)) {
1740 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1741 "Could not allocate initialization request");
1742 return PTR_ERR(cqr);
1743 }
1744
1745 /* Prepare for Read Subsystem Data */
1746 prssdp = cqr->data;
1747 memset(prssdp, 0, sizeof(*prssdp));
1748 prssdp->order = PSF_ORDER_PRSSD;
1749 prssdp->suborder = PSF_SUBORDER_LCQ; /* Logical Configuration Query */
1750
1751 ccw = cqr->cpaddr;
1752 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1753 ccw->count = sizeof(*prssdp);
1754 ccw->flags |= CCW_FLAG_CC;
1755 ccw->cda = (__u32)(addr_t)prssdp;
1756
1757 lcq = (struct dasd_rssd_lcq *)(prssdp + 1);
1758 memset(lcq, 0, sizeof(*lcq));
1759
1760 ccw++;
1761 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1762 ccw->count = sizeof(*lcq);
1763 ccw->flags |= CCW_FLAG_SLI;
1764 ccw->cda = (__u32)(addr_t)lcq;
1765
1766 cqr->buildclk = get_tod_clock();
1767 cqr->status = DASD_CQR_FILLED;
1768 cqr->startdev = device;
1769 cqr->memdev = device;
1770 cqr->block = NULL;
1771 cqr->retries = 256;
1772 cqr->expires = device->default_expires * HZ;
1773 /* The command might not be supported. Suppress the error output */
1774 __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
1775
1776 rc = dasd_sleep_on_interruptible(cqr);
1777 if (rc == 0) {
1778 dasd_eckd_cpy_ext_pool_data(device, lcq);
1779 } else {
1780 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1781 "Reading the logical configuration failed with rc=%d", rc);
1782 }
1783
1784 dasd_sfree_request(cqr, cqr->memdev);
1785
1786 return rc;
1787 }
1788
1789 /*
1790 * Depending on the device type, the extent size is specified either as
1791 * cylinders per extent (CKD) or size per extent (FBA)
1792 * A 1GB size corresponds to 1113cyl, and 16MB to 21cyl.
1793 */
1794 static int dasd_eckd_ext_size(struct dasd_device *device)
1795 {
1796 struct dasd_eckd_private *private = device->private;
1797 struct dasd_ext_pool_sum eps = private->eps;
1798
1799 if (!eps.flags.extent_size_valid)
1800 return 0;
1801 if (eps.extent_size.size_1G)
1802 return 1113;
1803 if (eps.extent_size.size_16M)
1804 return 21;
1805
1806 return 0;
1807 }
1808
1809 static int dasd_eckd_ext_pool_warn_thrshld(struct dasd_device *device)
1810 {
1811 struct dasd_eckd_private *private = device->private;
1812
1813 return private->eps.warn_thrshld;
1814 }
1815
1816 static int dasd_eckd_ext_pool_cap_at_warnlevel(struct dasd_device *device)
1817 {
1818 struct dasd_eckd_private *private = device->private;
1819
1820 return private->eps.flags.capacity_at_warnlevel;
1821 }
1822
1823 /*
1824 * Extent Pool out of space
1825 */
1826 static int dasd_eckd_ext_pool_oos(struct dasd_device *device)
1827 {
1828 struct dasd_eckd_private *private = device->private;
1829
1830 return private->eps.flags.pool_oos;
1831 }
1832
1833 /*
1834 * Build CP for Perform Subsystem Function - SSC.
1835 */
1836 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1837 int enable_pav)
1838 {
1839 struct dasd_ccw_req *cqr;
1840 struct dasd_psf_ssc_data *psf_ssc_data;
1841 struct ccw1 *ccw;
1842
1843 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1844 sizeof(struct dasd_psf_ssc_data),
1845 device, NULL);
1846
1847 if (IS_ERR(cqr)) {
1848 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1849 "Could not allocate PSF-SSC request");
1850 return cqr;
1851 }
1852 psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1853 psf_ssc_data->order = PSF_ORDER_SSC;
1854 psf_ssc_data->suborder = 0xc0;
1855 if (enable_pav) {
1856 psf_ssc_data->suborder |= 0x08;
1857 psf_ssc_data->reserved[0] = 0x88;
1858 }
1859 ccw = cqr->cpaddr;
1860 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1861 ccw->cda = (__u32)(addr_t)psf_ssc_data;
1862 ccw->count = 66;
1863
1864 cqr->startdev = device;
1865 cqr->memdev = device;
1866 cqr->block = NULL;
1867 cqr->retries = 256;
1868 cqr->expires = 10*HZ;
1869 cqr->buildclk = get_tod_clock();
1870 cqr->status = DASD_CQR_FILLED;
1871 return cqr;
1872 }
1873
1874 /*
1875 * Perform Subsystem Function.
1876 * It is necessary to trigger CIO for channel revalidation since this
1877 * call might change behaviour of DASD devices.
1878 */
1879 static int
1880 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1881 unsigned long flags)
1882 {
1883 struct dasd_ccw_req *cqr;
1884 int rc;
1885
1886 cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1887 if (IS_ERR(cqr))
1888 return PTR_ERR(cqr);
1889
1890 /*
1891 * set flags e.g. turn on failfast, to prevent blocking
1892 * the calling function should handle failed requests
1893 */
1894 cqr->flags |= flags;
1895
1896 rc = dasd_sleep_on(cqr);
1897 if (!rc)
1898 /* trigger CIO to reprobe devices */
1899 css_schedule_reprobe();
1900 else if (cqr->intrc == -EAGAIN)
1901 rc = -EAGAIN;
1902
1903 dasd_sfree_request(cqr, cqr->memdev);
1904 return rc;
1905 }
1906
1907 /*
1908 * Valide storage server of current device.
1909 */
1910 static int dasd_eckd_validate_server(struct dasd_device *device,
1911 unsigned long flags)
1912 {
1913 struct dasd_eckd_private *private = device->private;
1914 int enable_pav, rc;
1915
1916 if (private->uid.type == UA_BASE_PAV_ALIAS ||
1917 private->uid.type == UA_HYPER_PAV_ALIAS)
1918 return 0;
1919 if (dasd_nopav || MACHINE_IS_VM)
1920 enable_pav = 0;
1921 else
1922 enable_pav = 1;
1923 rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1924
1925 /* may be requested feature is not available on server,
1926 * therefore just report error and go ahead */
1927 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1928 "returned rc=%d", private->uid.ssid, rc);
1929 return rc;
1930 }
1931
1932 /*
1933 * worker to do a validate server in case of a lost pathgroup
1934 */
1935 static void dasd_eckd_do_validate_server(struct work_struct *work)
1936 {
1937 struct dasd_device *device = container_of(work, struct dasd_device,
1938 kick_validate);
1939 unsigned long flags = 0;
1940
1941 set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1942 if (dasd_eckd_validate_server(device, flags)
1943 == -EAGAIN) {
1944 /* schedule worker again if failed */
1945 schedule_work(&device->kick_validate);
1946 return;
1947 }
1948
1949 dasd_put_device(device);
1950 }
1951
1952 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1953 {
1954 dasd_get_device(device);
1955 /* exit if device not online or in offline processing */
1956 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1957 device->state < DASD_STATE_ONLINE) {
1958 dasd_put_device(device);
1959 return;
1960 }
1961 /* queue call to do_validate_server to the kernel event daemon. */
1962 if (!schedule_work(&device->kick_validate))
1963 dasd_put_device(device);
1964 }
1965
1966 /*
1967 * Check device characteristics.
1968 * If the device is accessible using ECKD discipline, the device is enabled.
1969 */
1970 static int
1971 dasd_eckd_check_characteristics(struct dasd_device *device)
1972 {
1973 struct dasd_eckd_private *private = device->private;
1974 struct dasd_block *block;
1975 struct dasd_uid temp_uid;
1976 int rc, i;
1977 int readonly;
1978 unsigned long value;
1979
1980 /* setup work queue for validate server*/
1981 INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1982 /* setup work queue for summary unit check */
1983 INIT_WORK(&device->suc_work, dasd_alias_handle_summary_unit_check);
1984
1985 if (!ccw_device_is_pathgroup(device->cdev)) {
1986 dev_warn(&device->cdev->dev,
1987 "A channel path group could not be established\n");
1988 return -EIO;
1989 }
1990 if (!ccw_device_is_multipath(device->cdev)) {
1991 dev_info(&device->cdev->dev,
1992 "The DASD is not operating in multipath mode\n");
1993 }
1994 if (!private) {
1995 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1996 if (!private) {
1997 dev_warn(&device->cdev->dev,
1998 "Allocating memory for private DASD data "
1999 "failed\n");
2000 return -ENOMEM;
2001 }
2002 device->private = private;
2003 } else {
2004 memset(private, 0, sizeof(*private));
2005 }
2006 /* Invalidate status of initial analysis. */
2007 private->init_cqr_status = -1;
2008 /* Set default cache operations. */
2009 private->attrib.operation = DASD_NORMAL_CACHE;
2010 private->attrib.nr_cyl = 0;
2011
2012 /* Read Configuration Data */
2013 rc = dasd_eckd_read_conf(device);
2014 if (rc)
2015 goto out_err1;
2016
2017 /* set some default values */
2018 device->default_expires = DASD_EXPIRES;
2019 device->default_retries = DASD_RETRIES;
2020 device->path_thrhld = DASD_ECKD_PATH_THRHLD;
2021 device->path_interval = DASD_ECKD_PATH_INTERVAL;
2022
2023 if (private->gneq) {
2024 value = 1;
2025 for (i = 0; i < private->gneq->timeout.value; i++)
2026 value = 10 * value;
2027 value = value * private->gneq->timeout.number;
2028 /* do not accept useless values */
2029 if (value != 0 && value <= DASD_EXPIRES_MAX)
2030 device->default_expires = value;
2031 }
2032
2033 dasd_eckd_get_uid(device, &temp_uid);
2034 if (temp_uid.type == UA_BASE_DEVICE) {
2035 block = dasd_alloc_block();
2036 if (IS_ERR(block)) {
2037 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
2038 "could not allocate dasd "
2039 "block structure");
2040 rc = PTR_ERR(block);
2041 goto out_err1;
2042 }
2043 device->block = block;
2044 block->base = device;
2045 }
2046
2047 /* register lcu with alias handling, enable PAV */
2048 rc = dasd_alias_make_device_known_to_lcu(device);
2049 if (rc)
2050 goto out_err2;
2051
2052 dasd_eckd_validate_server(device, 0);
2053
2054 /* device may report different configuration data after LCU setup */
2055 rc = dasd_eckd_read_conf(device);
2056 if (rc)
2057 goto out_err3;
2058
2059 /* Read Feature Codes */
2060 dasd_eckd_read_features(device);
2061
2062 /* Read Volume Information */
2063 dasd_eckd_read_vol_info(device);
2064
2065 /* Read Extent Pool Information */
2066 dasd_eckd_read_ext_pool_info(device);
2067
2068 /* Read Device Characteristics */
2069 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
2070 &private->rdc_data, 64);
2071 if (rc) {
2072 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
2073 "Read device characteristic failed, rc=%d", rc);
2074 goto out_err3;
2075 }
2076
2077 if ((device->features & DASD_FEATURE_USERAW) &&
2078 !(private->rdc_data.facilities.RT_in_LR)) {
2079 dev_err(&device->cdev->dev, "The storage server does not "
2080 "support raw-track access\n");
2081 rc = -EINVAL;
2082 goto out_err3;
2083 }
2084
2085 /* find the valid cylinder size */
2086 if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
2087 private->rdc_data.long_no_cyl)
2088 private->real_cyl = private->rdc_data.long_no_cyl;
2089 else
2090 private->real_cyl = private->rdc_data.no_cyl;
2091
2092 private->fcx_max_data = get_fcx_max_data(device);
2093
2094 readonly = dasd_device_is_ro(device);
2095 if (readonly)
2096 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
2097
2098 dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
2099 "with %d cylinders, %d heads, %d sectors%s\n",
2100 private->rdc_data.dev_type,
2101 private->rdc_data.dev_model,
2102 private->rdc_data.cu_type,
2103 private->rdc_data.cu_model.model,
2104 private->real_cyl,
2105 private->rdc_data.trk_per_cyl,
2106 private->rdc_data.sec_per_trk,
2107 readonly ? ", read-only device" : "");
2108 return 0;
2109
2110 out_err3:
2111 dasd_alias_disconnect_device_from_lcu(device);
2112 out_err2:
2113 dasd_free_block(device->block);
2114 device->block = NULL;
2115 out_err1:
2116 dasd_eckd_clear_conf_data(device);
2117 kfree(device->private);
2118 device->private = NULL;
2119 return rc;
2120 }
2121
2122 static void dasd_eckd_uncheck_device(struct dasd_device *device)
2123 {
2124 struct dasd_eckd_private *private = device->private;
2125
2126 if (!private)
2127 return;
2128
2129 dasd_alias_disconnect_device_from_lcu(device);
2130 private->ned = NULL;
2131 private->sneq = NULL;
2132 private->vdsneq = NULL;
2133 private->gneq = NULL;
2134 dasd_eckd_clear_conf_data(device);
2135 }
2136
2137 static struct dasd_ccw_req *
2138 dasd_eckd_analysis_ccw(struct dasd_device *device)
2139 {
2140 struct dasd_eckd_private *private = device->private;
2141 struct eckd_count *count_data;
2142 struct LO_eckd_data *LO_data;
2143 struct dasd_ccw_req *cqr;
2144 struct ccw1 *ccw;
2145 int cplength, datasize;
2146 int i;
2147
2148 cplength = 8;
2149 datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
2150 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device,
2151 NULL);
2152 if (IS_ERR(cqr))
2153 return cqr;
2154 ccw = cqr->cpaddr;
2155 /* Define extent for the first 2 tracks. */
2156 define_extent(ccw++, cqr->data, 0, 1,
2157 DASD_ECKD_CCW_READ_COUNT, device, 0);
2158 LO_data = cqr->data + sizeof(struct DE_eckd_data);
2159 /* Locate record for the first 4 records on track 0. */
2160 ccw[-1].flags |= CCW_FLAG_CC;
2161 locate_record(ccw++, LO_data++, 0, 0, 4,
2162 DASD_ECKD_CCW_READ_COUNT, device, 0);
2163
2164 count_data = private->count_area;
2165 for (i = 0; i < 4; i++) {
2166 ccw[-1].flags |= CCW_FLAG_CC;
2167 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2168 ccw->flags = 0;
2169 ccw->count = 8;
2170 ccw->cda = (__u32)(addr_t) count_data;
2171 ccw++;
2172 count_data++;
2173 }
2174
2175 /* Locate record for the first record on track 1. */
2176 ccw[-1].flags |= CCW_FLAG_CC;
2177 locate_record(ccw++, LO_data++, 1, 0, 1,
2178 DASD_ECKD_CCW_READ_COUNT, device, 0);
2179 /* Read count ccw. */
2180 ccw[-1].flags |= CCW_FLAG_CC;
2181 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2182 ccw->flags = 0;
2183 ccw->count = 8;
2184 ccw->cda = (__u32)(addr_t) count_data;
2185
2186 cqr->block = NULL;
2187 cqr->startdev = device;
2188 cqr->memdev = device;
2189 cqr->retries = 255;
2190 cqr->buildclk = get_tod_clock();
2191 cqr->status = DASD_CQR_FILLED;
2192 /* Set flags to suppress output for expected errors */
2193 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2194
2195 return cqr;
2196 }
2197
2198 /* differentiate between 'no record found' and any other error */
2199 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
2200 {
2201 char *sense;
2202 if (init_cqr->status == DASD_CQR_DONE)
2203 return INIT_CQR_OK;
2204 else if (init_cqr->status == DASD_CQR_NEED_ERP ||
2205 init_cqr->status == DASD_CQR_FAILED) {
2206 sense = dasd_get_sense(&init_cqr->irb);
2207 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
2208 return INIT_CQR_UNFORMATTED;
2209 else
2210 return INIT_CQR_ERROR;
2211 } else
2212 return INIT_CQR_ERROR;
2213 }
2214
2215 /*
2216 * This is the callback function for the init_analysis cqr. It saves
2217 * the status of the initial analysis ccw before it frees it and kicks
2218 * the device to continue the startup sequence. This will call
2219 * dasd_eckd_do_analysis again (if the devices has not been marked
2220 * for deletion in the meantime).
2221 */
2222 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
2223 void *data)
2224 {
2225 struct dasd_device *device = init_cqr->startdev;
2226 struct dasd_eckd_private *private = device->private;
2227
2228 private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
2229 dasd_sfree_request(init_cqr, device);
2230 dasd_kick_device(device);
2231 }
2232
2233 static int dasd_eckd_start_analysis(struct dasd_block *block)
2234 {
2235 struct dasd_ccw_req *init_cqr;
2236
2237 init_cqr = dasd_eckd_analysis_ccw(block->base);
2238 if (IS_ERR(init_cqr))
2239 return PTR_ERR(init_cqr);
2240 init_cqr->callback = dasd_eckd_analysis_callback;
2241 init_cqr->callback_data = NULL;
2242 init_cqr->expires = 5*HZ;
2243 /* first try without ERP, so we can later handle unformatted
2244 * devices as special case
2245 */
2246 clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
2247 init_cqr->retries = 0;
2248 dasd_add_request_head(init_cqr);
2249 return -EAGAIN;
2250 }
2251
2252 static int dasd_eckd_end_analysis(struct dasd_block *block)
2253 {
2254 struct dasd_device *device = block->base;
2255 struct dasd_eckd_private *private = device->private;
2256 struct eckd_count *count_area;
2257 unsigned int sb, blk_per_trk;
2258 int status, i;
2259 struct dasd_ccw_req *init_cqr;
2260
2261 status = private->init_cqr_status;
2262 private->init_cqr_status = -1;
2263 if (status == INIT_CQR_ERROR) {
2264 /* try again, this time with full ERP */
2265 init_cqr = dasd_eckd_analysis_ccw(device);
2266 dasd_sleep_on(init_cqr);
2267 status = dasd_eckd_analysis_evaluation(init_cqr);
2268 dasd_sfree_request(init_cqr, device);
2269 }
2270
2271 if (device->features & DASD_FEATURE_USERAW) {
2272 block->bp_block = DASD_RAW_BLOCKSIZE;
2273 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
2274 block->s2b_shift = 3;
2275 goto raw;
2276 }
2277
2278 if (status == INIT_CQR_UNFORMATTED) {
2279 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
2280 return -EMEDIUMTYPE;
2281 } else if (status == INIT_CQR_ERROR) {
2282 dev_err(&device->cdev->dev,
2283 "Detecting the DASD disk layout failed because "
2284 "of an I/O error\n");
2285 return -EIO;
2286 }
2287
2288 private->uses_cdl = 1;
2289 /* Check Track 0 for Compatible Disk Layout */
2290 count_area = NULL;
2291 for (i = 0; i < 3; i++) {
2292 if (private->count_area[i].kl != 4 ||
2293 private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
2294 private->count_area[i].cyl != 0 ||
2295 private->count_area[i].head != count_area_head[i] ||
2296 private->count_area[i].record != count_area_rec[i]) {
2297 private->uses_cdl = 0;
2298 break;
2299 }
2300 }
2301 if (i == 3)
2302 count_area = &private->count_area[3];
2303
2304 if (private->uses_cdl == 0) {
2305 for (i = 0; i < 5; i++) {
2306 if ((private->count_area[i].kl != 0) ||
2307 (private->count_area[i].dl !=
2308 private->count_area[0].dl) ||
2309 private->count_area[i].cyl != 0 ||
2310 private->count_area[i].head != count_area_head[i] ||
2311 private->count_area[i].record != count_area_rec[i])
2312 break;
2313 }
2314 if (i == 5)
2315 count_area = &private->count_area[0];
2316 } else {
2317 if (private->count_area[3].record == 1)
2318 dev_warn(&device->cdev->dev,
2319 "Track 0 has no records following the VTOC\n");
2320 }
2321
2322 if (count_area != NULL && count_area->kl == 0) {
2323 /* we found notthing violating our disk layout */
2324 if (dasd_check_blocksize(count_area->dl) == 0)
2325 block->bp_block = count_area->dl;
2326 }
2327 if (block->bp_block == 0) {
2328 dev_warn(&device->cdev->dev,
2329 "The disk layout of the DASD is not supported\n");
2330 return -EMEDIUMTYPE;
2331 }
2332 block->s2b_shift = 0; /* bits to shift 512 to get a block */
2333 for (sb = 512; sb < block->bp_block; sb = sb << 1)
2334 block->s2b_shift++;
2335
2336 blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2337
2338 raw:
2339 block->blocks = ((unsigned long) private->real_cyl *
2340 private->rdc_data.trk_per_cyl *
2341 blk_per_trk);
2342
2343 dev_info(&device->cdev->dev,
2344 "DASD with %u KB/block, %lu KB total size, %u KB/track, "
2345 "%s\n", (block->bp_block >> 10),
2346 (((unsigned long) private->real_cyl *
2347 private->rdc_data.trk_per_cyl *
2348 blk_per_trk * (block->bp_block >> 9)) >> 1),
2349 ((blk_per_trk * block->bp_block) >> 10),
2350 private->uses_cdl ?
2351 "compatible disk layout" : "linux disk layout");
2352
2353 return 0;
2354 }
2355
2356 static int dasd_eckd_do_analysis(struct dasd_block *block)
2357 {
2358 struct dasd_eckd_private *private = block->base->private;
2359
2360 if (private->init_cqr_status < 0)
2361 return dasd_eckd_start_analysis(block);
2362 else
2363 return dasd_eckd_end_analysis(block);
2364 }
2365
2366 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2367 {
2368 return dasd_alias_add_device(device);
2369 };
2370
2371 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2372 {
2373 if (cancel_work_sync(&device->reload_device))
2374 dasd_put_device(device);
2375 if (cancel_work_sync(&device->kick_validate))
2376 dasd_put_device(device);
2377
2378 return 0;
2379 };
2380
2381 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2382 {
2383 return dasd_alias_remove_device(device);
2384 };
2385
2386 static int
2387 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2388 {
2389 struct dasd_eckd_private *private = block->base->private;
2390
2391 if (dasd_check_blocksize(block->bp_block) == 0) {
2392 geo->sectors = recs_per_track(&private->rdc_data,
2393 0, block->bp_block);
2394 }
2395 geo->cylinders = private->rdc_data.no_cyl;
2396 geo->heads = private->rdc_data.trk_per_cyl;
2397 return 0;
2398 }
2399
2400 /*
2401 * Build the TCW request for the format check
2402 */
2403 static struct dasd_ccw_req *
2404 dasd_eckd_build_check_tcw(struct dasd_device *base, struct format_data_t *fdata,
2405 int enable_pav, struct eckd_count *fmt_buffer,
2406 int rpt)
2407 {
2408 struct dasd_eckd_private *start_priv;
2409 struct dasd_device *startdev = NULL;
2410 struct tidaw *last_tidaw = NULL;
2411 struct dasd_ccw_req *cqr;
2412 struct itcw *itcw;
2413 int itcw_size;
2414 int count;
2415 int rc;
2416 int i;
2417
2418 if (enable_pav)
2419 startdev = dasd_alias_get_start_dev(base);
2420
2421 if (!startdev)
2422 startdev = base;
2423
2424 start_priv = startdev->private;
2425
2426 count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2427
2428 /*
2429 * we're adding 'count' amount of tidaw to the itcw.
2430 * calculate the corresponding itcw_size
2431 */
2432 itcw_size = itcw_calc_size(0, count, 0);
2433
2434 cqr = dasd_fmalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2435 if (IS_ERR(cqr))
2436 return cqr;
2437
2438 start_priv->count++;
2439
2440 itcw = itcw_init(cqr->data, itcw_size, ITCW_OP_READ, 0, count, 0);
2441 if (IS_ERR(itcw)) {
2442 rc = -EINVAL;
2443 goto out_err;
2444 }
2445
2446 cqr->cpaddr = itcw_get_tcw(itcw);
2447 rc = prepare_itcw(itcw, fdata->start_unit, fdata->stop_unit,
2448 DASD_ECKD_CCW_READ_COUNT_MT, base, startdev, 0, count,
2449 sizeof(struct eckd_count),
2450 count * sizeof(struct eckd_count), 0, rpt);
2451 if (rc)
2452 goto out_err;
2453
2454 for (i = 0; i < count; i++) {
2455 last_tidaw = itcw_add_tidaw(itcw, 0, fmt_buffer++,
2456 sizeof(struct eckd_count));
2457 if (IS_ERR(last_tidaw)) {
2458 rc = -EINVAL;
2459 goto out_err;
2460 }
2461 }
2462
2463 last_tidaw->flags |= TIDAW_FLAGS_LAST;
2464 itcw_finalize(itcw);
2465
2466 cqr->cpmode = 1;
2467 cqr->startdev = startdev;
2468 cqr->memdev = startdev;
2469 cqr->basedev = base;
2470 cqr->retries = startdev->default_retries;
2471 cqr->expires = startdev->default_expires * HZ;
2472 cqr->buildclk = get_tod_clock();
2473 cqr->status = DASD_CQR_FILLED;
2474 /* Set flags to suppress output for expected errors */
2475 set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
2476 set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
2477
2478 return cqr;
2479
2480 out_err:
2481 dasd_sfree_request(cqr, startdev);
2482
2483 return ERR_PTR(rc);
2484 }
2485
2486 /*
2487 * Build the CCW request for the format check
2488 */
2489 static struct dasd_ccw_req *
2490 dasd_eckd_build_check(struct dasd_device *base, struct format_data_t *fdata,
2491 int enable_pav, struct eckd_count *fmt_buffer, int rpt)
2492 {
2493 struct dasd_eckd_private *start_priv;
2494 struct dasd_eckd_private *base_priv;
2495 struct dasd_device *startdev = NULL;
2496 struct dasd_ccw_req *cqr;
2497 struct ccw1 *ccw;
2498 void *data;
2499 int cplength, datasize;
2500 int use_prefix;
2501 int count;
2502 int i;
2503
2504 if (enable_pav)
2505 startdev = dasd_alias_get_start_dev(base);
2506
2507 if (!startdev)
2508 startdev = base;
2509
2510 start_priv = startdev->private;
2511 base_priv = base->private;
2512
2513 count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2514
2515 use_prefix = base_priv->features.feature[8] & 0x01;
2516
2517 if (use_prefix) {
2518 cplength = 1;
2519 datasize = sizeof(struct PFX_eckd_data);
2520 } else {
2521 cplength = 2;
2522 datasize = sizeof(struct DE_eckd_data) +
2523 sizeof(struct LO_eckd_data);
2524 }
2525 cplength += count;
2526
2527 cqr = dasd_fmalloc_request(DASD_ECKD_MAGIC, cplength, datasize, startdev);
2528 if (IS_ERR(cqr))
2529 return cqr;
2530
2531 start_priv->count++;
2532 data = cqr->data;
2533 ccw = cqr->cpaddr;
2534
2535 if (use_prefix) {
2536 prefix_LRE(ccw++, data, fdata->start_unit, fdata->stop_unit,
2537 DASD_ECKD_CCW_READ_COUNT, base, startdev, 1, 0,
2538 count, 0, 0);
2539 } else {
2540 define_extent(ccw++, data, fdata->start_unit, fdata->stop_unit,
2541 DASD_ECKD_CCW_READ_COUNT, startdev, 0);
2542
2543 data += sizeof(struct DE_eckd_data);
2544 ccw[-1].flags |= CCW_FLAG_CC;
2545
2546 locate_record(ccw++, data, fdata->start_unit, 0, count,
2547 DASD_ECKD_CCW_READ_COUNT, base, 0);
2548 }
2549
2550 for (i = 0; i < count; i++) {
2551 ccw[-1].flags |= CCW_FLAG_CC;
2552 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2553 ccw->flags = CCW_FLAG_SLI;
2554 ccw->count = 8;
2555 ccw->cda = (__u32)(addr_t) fmt_buffer;
2556 ccw++;
2557 fmt_buffer++;
2558 }
2559
2560 cqr->startdev = startdev;
2561 cqr->memdev = startdev;
2562 cqr->basedev = base;
2563 cqr->retries = DASD_RETRIES;
2564 cqr->expires = startdev->default_expires * HZ;
2565 cqr->buildclk = get_tod_clock();
2566 cqr->status = DASD_CQR_FILLED;
2567 /* Set flags to suppress output for expected errors */
2568 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2569
2570 return cqr;
2571 }
2572
2573 static struct dasd_ccw_req *
2574 dasd_eckd_build_format(struct dasd_device *base, struct dasd_device *startdev,
2575 struct format_data_t *fdata, int enable_pav)
2576 {
2577 struct dasd_eckd_private *base_priv;
2578 struct dasd_eckd_private *start_priv;
2579 struct dasd_ccw_req *fcp;
2580 struct eckd_count *ect;
2581 struct ch_t address;
2582 struct ccw1 *ccw;
2583 void *data;
2584 int rpt;
2585 int cplength, datasize;
2586 int i, j;
2587 int intensity = 0;
2588 int r0_perm;
2589 int nr_tracks;
2590 int use_prefix;
2591
2592 if (enable_pav)
2593 startdev = dasd_alias_get_start_dev(base);
2594
2595 if (!startdev)
2596 startdev = base;
2597
2598 start_priv = startdev->private;
2599 base_priv = base->private;
2600
2601 rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2602
2603 nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2604
2605 /*
2606 * fdata->intensity is a bit string that tells us what to do:
2607 * Bit 0: write record zero
2608 * Bit 1: write home address, currently not supported
2609 * Bit 2: invalidate tracks
2610 * Bit 3: use OS/390 compatible disk layout (cdl)
2611 * Bit 4: do not allow storage subsystem to modify record zero
2612 * Only some bit combinations do make sense.
2613 */
2614 if (fdata->intensity & 0x10) {
2615 r0_perm = 0;
2616 intensity = fdata->intensity & ~0x10;
2617 } else {
2618 r0_perm = 1;
2619 intensity = fdata->intensity;
2620 }
2621
2622 use_prefix = base_priv->features.feature[8] & 0x01;
2623
2624 switch (intensity) {
2625 case 0x00: /* Normal format */
2626 case 0x08: /* Normal format, use cdl. */
2627 cplength = 2 + (rpt*nr_tracks);
2628 if (use_prefix)
2629 datasize = sizeof(struct PFX_eckd_data) +
2630 sizeof(struct LO_eckd_data) +
2631 rpt * nr_tracks * sizeof(struct eckd_count);
2632 else
2633 datasize = sizeof(struct DE_eckd_data) +
2634 sizeof(struct LO_eckd_data) +
2635 rpt * nr_tracks * sizeof(struct eckd_count);
2636 break;
2637 case 0x01: /* Write record zero and format track. */
2638 case 0x09: /* Write record zero and format track, use cdl. */
2639 cplength = 2 + rpt * nr_tracks;
2640 if (use_prefix)
2641 datasize = sizeof(struct PFX_eckd_data) +
2642 sizeof(struct LO_eckd_data) +
2643 sizeof(struct eckd_count) +
2644 rpt * nr_tracks * sizeof(struct eckd_count);
2645 else
2646 datasize = sizeof(struct DE_eckd_data) +
2647 sizeof(struct LO_eckd_data) +
2648 sizeof(struct eckd_count) +
2649 rpt * nr_tracks * sizeof(struct eckd_count);
2650 break;
2651 case 0x04: /* Invalidate track. */
2652 case 0x0c: /* Invalidate track, use cdl. */
2653 cplength = 3;
2654 if (use_prefix)
2655 datasize = sizeof(struct PFX_eckd_data) +
2656 sizeof(struct LO_eckd_data) +
2657 sizeof(struct eckd_count);
2658 else
2659 datasize = sizeof(struct DE_eckd_data) +
2660 sizeof(struct LO_eckd_data) +
2661 sizeof(struct eckd_count);
2662 break;
2663 default:
2664 dev_warn(&startdev->cdev->dev,
2665 "An I/O control call used incorrect flags 0x%x\n",
2666 fdata->intensity);
2667 return ERR_PTR(-EINVAL);
2668 }
2669
2670 fcp = dasd_fmalloc_request(DASD_ECKD_MAGIC, cplength, datasize, startdev);
2671 if (IS_ERR(fcp))
2672 return fcp;
2673
2674 start_priv->count++;
2675 data = fcp->data;
2676 ccw = fcp->cpaddr;
2677
2678 switch (intensity & ~0x08) {
2679 case 0x00: /* Normal format. */
2680 if (use_prefix) {
2681 prefix(ccw++, (struct PFX_eckd_data *) data,
2682 fdata->start_unit, fdata->stop_unit,
2683 DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2684 /* grant subsystem permission to format R0 */
2685 if (r0_perm)
2686 ((struct PFX_eckd_data *)data)
2687 ->define_extent.ga_extended |= 0x04;
2688 data += sizeof(struct PFX_eckd_data);
2689 } else {
2690 define_extent(ccw++, (struct DE_eckd_data *) data,
2691 fdata->start_unit, fdata->stop_unit,
2692 DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2693 /* grant subsystem permission to format R0 */
2694 if (r0_perm)
2695 ((struct DE_eckd_data *) data)
2696 ->ga_extended |= 0x04;
2697 data += sizeof(struct DE_eckd_data);
2698 }
2699 ccw[-1].flags |= CCW_FLAG_CC;
2700 locate_record(ccw++, (struct LO_eckd_data *) data,
2701 fdata->start_unit, 0, rpt*nr_tracks,
2702 DASD_ECKD_CCW_WRITE_CKD, base,
2703 fdata->blksize);
2704 data += sizeof(struct LO_eckd_data);
2705 break;
2706 case 0x01: /* Write record zero + format track. */
2707 if (use_prefix) {
2708 prefix(ccw++, (struct PFX_eckd_data *) data,
2709 fdata->start_unit, fdata->stop_unit,
2710 DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2711 base, startdev);
2712 data += sizeof(struct PFX_eckd_data);
2713 } else {
2714 define_extent(ccw++, (struct DE_eckd_data *) data,
2715 fdata->start_unit, fdata->stop_unit,
2716 DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev, 0);
2717 data += sizeof(struct DE_eckd_data);
2718 }
2719 ccw[-1].flags |= CCW_FLAG_CC;
2720 locate_record(ccw++, (struct LO_eckd_data *) data,
2721 fdata->start_unit, 0, rpt * nr_tracks + 1,
2722 DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2723 base->block->bp_block);
2724 data += sizeof(struct LO_eckd_data);
2725 break;
2726 case 0x04: /* Invalidate track. */
2727 if (use_prefix) {
2728 prefix(ccw++, (struct PFX_eckd_data *) data,
2729 fdata->start_unit, fdata->stop_unit,
2730 DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2731 data += sizeof(struct PFX_eckd_data);
2732 } else {
2733 define_extent(ccw++, (struct DE_eckd_data *) data,
2734 fdata->start_unit, fdata->stop_unit,
2735 DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2736 data += sizeof(struct DE_eckd_data);
2737 }
2738 ccw[-1].flags |= CCW_FLAG_CC;
2739 locate_record(ccw++, (struct LO_eckd_data *) data,
2740 fdata->start_unit, 0, 1,
2741 DASD_ECKD_CCW_WRITE_CKD, base, 8);
2742 data += sizeof(struct LO_eckd_data);
2743 break;
2744 }
2745
2746 for (j = 0; j < nr_tracks; j++) {
2747 /* calculate cylinder and head for the current track */
2748 set_ch_t(&address,
2749 (fdata->start_unit + j) /
2750 base_priv->rdc_data.trk_per_cyl,
2751 (fdata->start_unit + j) %
2752 base_priv->rdc_data.trk_per_cyl);
2753 if (intensity & 0x01) { /* write record zero */
2754 ect = (struct eckd_count *) data;
2755 data += sizeof(struct eckd_count);
2756 ect->cyl = address.cyl;
2757 ect->head = address.head;
2758 ect->record = 0;
2759 ect->kl = 0;
2760 ect->dl = 8;
2761 ccw[-1].flags |= CCW_FLAG_CC;
2762 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2763 ccw->flags = CCW_FLAG_SLI;
2764 ccw->count = 8;
2765 ccw->cda = (__u32)(addr_t) ect;
2766 ccw++;
2767 }
2768 if ((intensity & ~0x08) & 0x04) { /* erase track */
2769 ect = (struct eckd_count *) data;
2770 data += sizeof(struct eckd_count);
2771 ect->cyl = address.cyl;
2772 ect->head = address.head;
2773 ect->record = 1;
2774 ect->kl = 0;
2775 ect->dl = 0;
2776 ccw[-1].flags |= CCW_FLAG_CC;
2777 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2778 ccw->flags = CCW_FLAG_SLI;
2779 ccw->count = 8;
2780 ccw->cda = (__u32)(addr_t) ect;
2781 } else { /* write remaining records */
2782 for (i = 0; i < rpt; i++) {
2783 ect = (struct eckd_count *) data;
2784 data += sizeof(struct eckd_count);
2785 ect->cyl = address.cyl;
2786 ect->head = address.head;
2787 ect->record = i + 1;
2788 ect->kl = 0;
2789 ect->dl = fdata->blksize;
2790 /*
2791 * Check for special tracks 0-1
2792 * when formatting CDL
2793 */
2794 if ((intensity & 0x08) &&
2795 address.cyl == 0 && address.head == 0) {
2796 if (i < 3) {
2797 ect->kl = 4;
2798 ect->dl = sizes_trk0[i] - 4;
2799 }
2800 }
2801 if ((intensity & 0x08) &&
2802 address.cyl == 0 && address.head == 1) {
2803 ect->kl = 44;
2804 ect->dl = LABEL_SIZE - 44;
2805 }
2806 ccw[-1].flags |= CCW_FLAG_CC;
2807 if (i != 0 || j == 0)
2808 ccw->cmd_code =
2809 DASD_ECKD_CCW_WRITE_CKD;
2810 else
2811 ccw->cmd_code =
2812 DASD_ECKD_CCW_WRITE_CKD_MT;
2813 ccw->flags = CCW_FLAG_SLI;
2814 ccw->count = 8;
2815 ccw->cda = (__u32)(addr_t) ect;
2816 ccw++;
2817 }
2818 }
2819 }
2820
2821 fcp->startdev = startdev;
2822 fcp->memdev = startdev;
2823 fcp->basedev = base;
2824 fcp->retries = 256;
2825 fcp->expires = startdev->default_expires * HZ;
2826 fcp->buildclk = get_tod_clock();
2827 fcp->status = DASD_CQR_FILLED;
2828
2829 return fcp;
2830 }
2831
2832 /*
2833 * Wrapper function to build a CCW request depending on input data
2834 */
2835 static struct dasd_ccw_req *
2836 dasd_eckd_format_build_ccw_req(struct dasd_device *base,
2837 struct format_data_t *fdata, int enable_pav,
2838 int tpm, struct eckd_count *fmt_buffer, int rpt)
2839 {
2840 struct dasd_ccw_req *ccw_req;
2841
2842 if (!fmt_buffer) {
2843 ccw_req = dasd_eckd_build_format(base, NULL, fdata, enable_pav);
2844 } else {
2845 if (tpm)
2846 ccw_req = dasd_eckd_build_check_tcw(base, fdata,
2847 enable_pav,
2848 fmt_buffer, rpt);
2849 else
2850 ccw_req = dasd_eckd_build_check(base, fdata, enable_pav,
2851 fmt_buffer, rpt);
2852 }
2853
2854 return ccw_req;
2855 }
2856
2857 /*
2858 * Sanity checks on format_data
2859 */
2860 static int dasd_eckd_format_sanity_checks(struct dasd_device *base,
2861 struct format_data_t *fdata)
2862 {
2863 struct dasd_eckd_private *private = base->private;
2864
2865 if (fdata->start_unit >=
2866 (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2867 dev_warn(&base->cdev->dev,
2868 "Start track number %u used in formatting is too big\n",
2869 fdata->start_unit);
2870 return -EINVAL;
2871 }
2872 if (fdata->stop_unit >=
2873 (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2874 dev_warn(&base->cdev->dev,
2875 "Stop track number %u used in formatting is too big\n",
2876 fdata->stop_unit);
2877 return -EINVAL;
2878 }
2879 if (fdata->start_unit > fdata->stop_unit) {
2880 dev_warn(&base->cdev->dev,
2881 "Start track %u used in formatting exceeds end track\n",
2882 fdata->start_unit);
2883 return -EINVAL;
2884 }
2885 if (dasd_check_blocksize(fdata->blksize) != 0) {
2886 dev_warn(&base->cdev->dev,
2887 "The DASD cannot be formatted with block size %u\n",
2888 fdata->blksize);
2889 return -EINVAL;
2890 }
2891 return 0;
2892 }
2893
2894 /*
2895 * This function will process format_data originally coming from an IOCTL
2896 */
2897 static int dasd_eckd_format_process_data(struct dasd_device *base,
2898 struct format_data_t *fdata,
2899 int enable_pav, int tpm,
2900 struct eckd_count *fmt_buffer, int rpt,
2901 struct irb *irb)
2902 {
2903 struct dasd_eckd_private *private = base->private;
2904 struct dasd_ccw_req *cqr, *n;
2905 struct list_head format_queue;
2906 struct dasd_device *device;
2907 char *sense = NULL;
2908 int old_start, old_stop, format_step;
2909 int step, retry;
2910 int rc;
2911
2912 rc = dasd_eckd_format_sanity_checks(base, fdata);
2913 if (rc)
2914 return rc;
2915
2916 INIT_LIST_HEAD(&format_queue);
2917
2918 old_start = fdata->start_unit;
2919 old_stop = fdata->stop_unit;
2920
2921 if (!tpm && fmt_buffer != NULL) {
2922 /* Command Mode / Format Check */
2923 format_step = 1;
2924 } else if (tpm && fmt_buffer != NULL) {
2925 /* Transport Mode / Format Check */
2926 format_step = DASD_CQR_MAX_CCW / rpt;
2927 } else {
2928 /* Normal Formatting */
2929 format_step = DASD_CQR_MAX_CCW /
2930 recs_per_track(&private->rdc_data, 0, fdata->blksize);
2931 }
2932
2933 do {
2934 retry = 0;
2935 while (fdata->start_unit <= old_stop) {
2936 step = fdata->stop_unit - fdata->start_unit + 1;
2937 if (step > format_step) {
2938 fdata->stop_unit =
2939 fdata->start_unit + format_step - 1;
2940 }
2941
2942 cqr = dasd_eckd_format_build_ccw_req(base, fdata,
2943 enable_pav, tpm,
2944 fmt_buffer, rpt);
2945 if (IS_ERR(cqr)) {
2946 rc = PTR_ERR(cqr);
2947 if (rc == -ENOMEM) {
2948 if (list_empty(&format_queue))
2949 goto out;
2950 /*
2951 * not enough memory available, start
2952 * requests retry after first requests
2953 * were finished
2954 */
2955 retry = 1;
2956 break;
2957 }
2958 goto out_err;
2959 }
2960 list_add_tail(&cqr->blocklist, &format_queue);
2961
2962 if (fmt_buffer) {
2963 step = fdata->stop_unit - fdata->start_unit + 1;
2964 fmt_buffer += rpt * step;
2965 }
2966 fdata->start_unit = fdata->stop_unit + 1;
2967 fdata->stop_unit = old_stop;
2968 }
2969
2970 rc = dasd_sleep_on_queue(&format_queue);
2971
2972 out_err:
2973 list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2974 device = cqr->startdev;
2975 private = device->private;
2976
2977 if (cqr->status == DASD_CQR_FAILED) {
2978 /*
2979 * Only get sense data if called by format
2980 * check
2981 */
2982 if (fmt_buffer && irb) {
2983 sense = dasd_get_sense(&cqr->irb);
2984 memcpy(irb, &cqr->irb, sizeof(*irb));
2985 }
2986 rc = -EIO;
2987 }
2988 list_del_init(&cqr->blocklist);
2989 dasd_ffree_request(cqr, device);
2990 private->count--;
2991 }
2992
2993 if (rc && rc != -EIO)
2994 goto out;
2995 if (rc == -EIO) {
2996 /*
2997 * In case fewer than the expected records are on the
2998 * track, we will most likely get a 'No Record Found'
2999 * error (in command mode) or a 'File Protected' error
3000 * (in transport mode). Those particular cases shouldn't
3001 * pass the -EIO to the IOCTL, therefore reset the rc
3002 * and continue.
3003 */
3004 if (sense &&
3005 (sense[1] & SNS1_NO_REC_FOUND ||
3006 sense[1] & SNS1_FILE_PROTECTED))
3007 retry = 1;
3008 else
3009 goto out;
3010 }
3011
3012 } while (retry);
3013
3014 out:
3015 fdata->start_unit = old_start;
3016 fdata->stop_unit = old_stop;
3017
3018 return rc;
3019 }
3020
3021 static int dasd_eckd_format_device(struct dasd_device *base,
3022 struct format_data_t *fdata, int enable_pav)
3023 {
3024 return dasd_eckd_format_process_data(base, fdata, enable_pav, 0, NULL,
3025 0, NULL);
3026 }
3027
3028 static bool test_and_set_format_track(struct dasd_format_entry *to_format,
3029 struct dasd_block *block)
3030 {
3031 struct dasd_format_entry *format;
3032 unsigned long flags;
3033 bool rc = false;
3034
3035 spin_lock_irqsave(&block->format_lock, flags);
3036 list_for_each_entry(format, &block->format_list, list) {
3037 if (format->track == to_format->track) {
3038 rc = true;
3039 goto out;
3040 }
3041 }
3042 list_add_tail(&to_format->list, &block->format_list);
3043
3044 out:
3045 spin_unlock_irqrestore(&block->format_lock, flags);
3046 return rc;
3047 }
3048
3049 static void clear_format_track(struct dasd_format_entry *format,
3050 struct dasd_block *block)
3051 {
3052 unsigned long flags;
3053
3054 spin_lock_irqsave(&block->format_lock, flags);
3055 list_del_init(&format->list);
3056 spin_unlock_irqrestore(&block->format_lock, flags);
3057 }
3058
3059 /*
3060 * Callback function to free ESE format requests.
3061 */
3062 static void dasd_eckd_ese_format_cb(struct dasd_ccw_req *cqr, void *data)
3063 {
3064 struct dasd_device *device = cqr->startdev;
3065 struct dasd_eckd_private *private = device->private;
3066 struct dasd_format_entry *format = data;
3067
3068 clear_format_track(format, cqr->basedev->block);
3069 private->count--;
3070 dasd_ffree_request(cqr, device);
3071 }
3072
3073 static struct dasd_ccw_req *
3074 dasd_eckd_ese_format(struct dasd_device *startdev, struct dasd_ccw_req *cqr,
3075 struct irb *irb)
3076 {
3077 struct dasd_eckd_private *private;
3078 struct dasd_format_entry *format;
3079 struct format_data_t fdata;
3080 unsigned int recs_per_trk;
3081 struct dasd_ccw_req *fcqr;
3082 struct dasd_device *base;
3083 struct dasd_block *block;
3084 unsigned int blksize;
3085 struct request *req;
3086 sector_t first_trk;
3087 sector_t last_trk;
3088 sector_t curr_trk;
3089 int rc;
3090
3091 req = cqr->callback_data;
3092 block = cqr->block;
3093 base = block->base;
3094 private = base->private;
3095 blksize = block->bp_block;
3096 recs_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3097 format = &startdev->format_entry;
3098
3099 first_trk = blk_rq_pos(req) >> block->s2b_shift;
3100 sector_div(first_trk, recs_per_trk);
3101 last_trk =
3102 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3103 sector_div(last_trk, recs_per_trk);
3104 rc = dasd_eckd_track_from_irb(irb, base, &curr_trk);
3105 if (rc)
3106 return ERR_PTR(rc);
3107
3108 if (curr_trk < first_trk || curr_trk > last_trk) {
3109 DBF_DEV_EVENT(DBF_WARNING, startdev,
3110 "ESE error track %llu not within range %llu - %llu\n",
3111 curr_trk, first_trk, last_trk);
3112 return ERR_PTR(-EINVAL);
3113 }
3114 format->track = curr_trk;
3115 /* test if track is already in formatting by another thread */
3116 if (test_and_set_format_track(format, block))
3117 return ERR_PTR(-EEXIST);
3118
3119 fdata.start_unit = curr_trk;
3120 fdata.stop_unit = curr_trk;
3121 fdata.blksize = blksize;
3122 fdata.intensity = private->uses_cdl ? DASD_FMT_INT_COMPAT : 0;
3123
3124 rc = dasd_eckd_format_sanity_checks(base, &fdata);
3125 if (rc)
3126 return ERR_PTR(-EINVAL);
3127
3128 /*
3129 * We're building the request with PAV disabled as we're reusing
3130 * the former startdev.
3131 */
3132 fcqr = dasd_eckd_build_format(base, startdev, &fdata, 0);
3133 if (IS_ERR(fcqr))
3134 return fcqr;
3135
3136 fcqr->callback = dasd_eckd_ese_format_cb;
3137 fcqr->callback_data = (void *) format;
3138
3139 return fcqr;
3140 }
3141
3142 /*
3143 * When data is read from an unformatted area of an ESE volume, this function
3144 * returns zeroed data and thereby mimics a read of zero data.
3145 *
3146 * The first unformatted track is the one that got the NRF error, the address is
3147 * encoded in the sense data.
3148 *
3149 * All tracks before have returned valid data and should not be touched.
3150 * All tracks after the unformatted track might be formatted or not. This is
3151 * currently not known, remember the processed data and return the remainder of
3152 * the request to the blocklayer in __dasd_cleanup_cqr().
3153 */
3154 static int dasd_eckd_ese_read(struct dasd_ccw_req *cqr, struct irb *irb)
3155 {
3156 struct dasd_eckd_private *private;
3157 sector_t first_trk, last_trk;
3158 sector_t first_blk, last_blk;
3159 unsigned int blksize, off;
3160 unsigned int recs_per_trk;
3161 struct dasd_device *base;
3162 struct req_iterator iter;
3163 struct dasd_block *block;
3164 unsigned int skip_block;
3165 unsigned int blk_count;
3166 struct request *req;
3167 struct bio_vec bv;
3168 sector_t curr_trk;
3169 sector_t end_blk;
3170 char *dst;
3171 int rc;
3172
3173 req = (struct request *) cqr->callback_data;
3174 base = cqr->block->base;
3175 blksize = base->block->bp_block;
3176 block = cqr->block;
3177 private = base->private;
3178 skip_block = 0;
3179 blk_count = 0;
3180
3181 recs_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3182 first_trk = first_blk = blk_rq_pos(req) >> block->s2b_shift;
3183 sector_div(first_trk, recs_per_trk);
3184 last_trk = last_blk =
3185 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3186 sector_div(last_trk, recs_per_trk);
3187 rc = dasd_eckd_track_from_irb(irb, base, &curr_trk);
3188 if (rc)
3189 return rc;
3190
3191 /* sanity check if the current track from sense data is valid */
3192 if (curr_trk < first_trk || curr_trk > last_trk) {
3193 DBF_DEV_EVENT(DBF_WARNING, base,
3194 "ESE error track %llu not within range %llu - %llu\n",
3195 curr_trk, first_trk, last_trk);
3196 return -EINVAL;
3197 }
3198
3199 /*
3200 * if not the first track got the NRF error we have to skip over valid
3201 * blocks
3202 */
3203 if (curr_trk != first_trk)
3204 skip_block = curr_trk * recs_per_trk - first_blk;
3205
3206 /* we have no information beyond the current track */
3207 end_blk = (curr_trk + 1) * recs_per_trk;
3208
3209 rq_for_each_segment(bv, req, iter) {
3210 dst = page_address(bv.bv_page) + bv.bv_offset;
3211 for (off = 0; off < bv.bv_len; off += blksize) {
3212 if (first_blk + blk_count >= end_blk) {
3213 cqr->proc_bytes = blk_count * blksize;
3214 return 0;
3215 }
3216 if (dst && !skip_block) {
3217 dst += off;
3218 memset(dst, 0, blksize);
3219 } else {
3220 skip_block--;
3221 }
3222 blk_count++;
3223 }
3224 }
3225 return 0;
3226 }
3227
3228 /*
3229 * Helper function to count consecutive records of a single track.
3230 */
3231 static int dasd_eckd_count_records(struct eckd_count *fmt_buffer, int start,
3232 int max)
3233 {
3234 int head;
3235 int i;
3236
3237 head = fmt_buffer[start].head;
3238
3239 /*
3240 * There are 3 conditions where we stop counting:
3241 * - if data reoccurs (same head and record may reoccur), which may
3242 * happen due to the way DASD_ECKD_CCW_READ_COUNT works
3243 * - when the head changes, because we're iterating over several tracks
3244 * then (DASD_ECKD_CCW_READ_COUNT_MT)
3245 * - when we've reached the end of sensible data in the buffer (the
3246 * record will be 0 then)
3247 */
3248 for (i = start; i < max; i++) {
3249 if (i > start) {
3250 if ((fmt_buffer[i].head == head &&
3251 fmt_buffer[i].record == 1) ||
3252 fmt_buffer[i].head != head ||
3253 fmt_buffer[i].record == 0)
3254 break;
3255 }
3256 }
3257
3258 return i - start;
3259 }
3260
3261 /*
3262 * Evaluate a given range of tracks. Data like number of records, blocksize,
3263 * record ids, and key length are compared with expected data.
3264 *
3265 * If a mismatch occurs, the corresponding error bit is set, as well as
3266 * additional information, depending on the error.
3267 */
3268 static void dasd_eckd_format_evaluate_tracks(struct eckd_count *fmt_buffer,
3269 struct format_check_t *cdata,
3270 int rpt_max, int rpt_exp,
3271 int trk_per_cyl, int tpm)
3272 {
3273 struct ch_t geo;
3274 int max_entries;
3275 int count = 0;
3276 int trkcount;
3277 int blksize;
3278 int pos = 0;
3279 int i, j;
3280 int kl;
3281
3282 trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
3283 max_entries = trkcount * rpt_max;
3284
3285 for (i = cdata->expect.start_unit; i <= cdata->expect.stop_unit; i++) {
3286 /* Calculate the correct next starting position in the buffer */
3287 if (tpm) {
3288 while (fmt_buffer[pos].record == 0 &&
3289 fmt_buffer[pos].dl == 0) {
3290 if (pos++ > max_entries)
3291 break;
3292 }
3293 } else {
3294 if (i != cdata->expect.start_unit)
3295 pos += rpt_max - count;
3296 }
3297
3298 /* Calculate the expected geo values for the current track */
3299 set_ch_t(&geo, i / trk_per_cyl, i % trk_per_cyl);
3300
3301 /* Count and check number of records */
3302 count = dasd_eckd_count_records(fmt_buffer, pos, pos + rpt_max);
3303
3304 if (count < rpt_exp) {
3305 cdata->result = DASD_FMT_ERR_TOO_FEW_RECORDS;
3306 break;
3307 }
3308 if (count > rpt_exp) {
3309 cdata->result = DASD_FMT_ERR_TOO_MANY_RECORDS;
3310 break;
3311 }
3312
3313 for (j = 0; j < count; j++, pos++) {
3314 blksize = cdata->expect.blksize;
3315 kl = 0;
3316
3317 /*
3318 * Set special values when checking CDL formatted
3319 * devices.
3320 */
3321 if ((cdata->expect.intensity & 0x08) &&
3322 geo.cyl == 0 && geo.head == 0) {
3323 if (j < 3) {
3324 blksize = sizes_trk0[j] - 4;
3325 kl = 4;
3326 }
3327 }
3328 if ((cdata->expect.intensity & 0x08) &&
3329 geo.cyl == 0 && geo.head == 1) {
3330 blksize = LABEL_SIZE - 44;
3331 kl = 44;
3332 }
3333
3334 /* Check blocksize */
3335 if (fmt_buffer[pos].dl != blksize) {
3336 cdata->result = DASD_FMT_ERR_BLKSIZE;
3337 goto out;
3338 }
3339 /* Check if key length is 0 */
3340 if (fmt_buffer[pos].kl != kl) {
3341 cdata->result = DASD_FMT_ERR_KEY_LENGTH;
3342 goto out;
3343 }
3344 /* Check if record_id is correct */
3345 if (fmt_buffer[pos].cyl != geo.cyl ||
3346 fmt_buffer[pos].head != geo.head ||
3347 fmt_buffer[pos].record != (j + 1)) {
3348 cdata->result = DASD_FMT_ERR_RECORD_ID;
3349 goto out;
3350 }
3351 }
3352 }
3353
3354 out:
3355 /*
3356 * In case of no errors, we need to decrease by one
3357 * to get the correct positions.
3358 */
3359 if (!cdata->result) {
3360 i--;
3361 pos--;
3362 }
3363
3364 cdata->unit = i;
3365 cdata->num_records = count;
3366 cdata->rec = fmt_buffer[pos].record;
3367 cdata->blksize = fmt_buffer[pos].dl;
3368 cdata->key_length = fmt_buffer[pos].kl;
3369 }
3370
3371 /*
3372 * Check the format of a range of tracks of a DASD.
3373 */
3374 static int dasd_eckd_check_device_format(struct dasd_device *base,
3375 struct format_check_t *cdata,
3376 int enable_pav)
3377 {
3378 struct dasd_eckd_private *private = base->private;
3379 struct eckd_count *fmt_buffer;
3380 struct irb irb;
3381 int rpt_max, rpt_exp;
3382 int fmt_buffer_size;
3383 int trk_per_cyl;
3384 int trkcount;
3385 int tpm = 0;
3386 int rc;
3387
3388 trk_per_cyl = private->rdc_data.trk_per_cyl;
3389
3390 /* Get maximum and expected amount of records per track */
3391 rpt_max = recs_per_track(&private->rdc_data, 0, 512) + 1;
3392 rpt_exp = recs_per_track(&private->rdc_data, 0, cdata->expect.blksize);
3393
3394 trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
3395 fmt_buffer_size = trkcount * rpt_max * sizeof(struct eckd_count);
3396
3397 fmt_buffer = kzalloc(fmt_buffer_size, GFP_KERNEL | GFP_DMA);
3398 if (!fmt_buffer)
3399 return -ENOMEM;
3400
3401 /*
3402 * A certain FICON feature subset is needed to operate in transport
3403 * mode. Additionally, the support for transport mode is implicitly
3404 * checked by comparing the buffer size with fcx_max_data. As long as
3405 * the buffer size is smaller we can operate in transport mode and
3406 * process multiple tracks. If not, only one track at once is being
3407 * processed using command mode.
3408 */
3409 if ((private->features.feature[40] & 0x04) &&
3410 fmt_buffer_size <= private->fcx_max_data)
3411 tpm = 1;
3412
3413 rc = dasd_eckd_format_process_data(base, &cdata->expect, enable_pav,
3414 tpm, fmt_buffer, rpt_max, &irb);
3415 if (rc && rc != -EIO)
3416 goto out;
3417 if (rc == -EIO) {
3418 /*
3419 * If our first attempt with transport mode enabled comes back
3420 * with an incorrect length error, we're going to retry the
3421 * check with command mode.
3422 */
3423 if (tpm && scsw_cstat(&irb.scsw) == 0x40) {
3424 tpm = 0;
3425 rc = dasd_eckd_format_process_data(base, &cdata->expect,
3426 enable_pav, tpm,
3427 fmt_buffer, rpt_max,
3428 &irb);
3429 if (rc)
3430 goto out;
3431 } else {
3432 goto out;
3433 }
3434 }
3435
3436 dasd_eckd_format_evaluate_tracks(fmt_buffer, cdata, rpt_max, rpt_exp,
3437 trk_per_cyl, tpm);
3438
3439 out:
3440 kfree(fmt_buffer);
3441
3442 return rc;
3443 }
3444
3445 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
3446 {
3447 if (cqr->retries < 0) {
3448 cqr->status = DASD_CQR_FAILED;
3449 return;
3450 }
3451 cqr->status = DASD_CQR_FILLED;
3452 if (cqr->block && (cqr->startdev != cqr->block->base)) {
3453 dasd_eckd_reset_ccw_to_base_io(cqr);
3454 cqr->startdev = cqr->block->base;
3455 cqr->lpm = dasd_path_get_opm(cqr->block->base);
3456 }
3457 };
3458
3459 static dasd_erp_fn_t
3460 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
3461 {
3462 struct dasd_device *device = (struct dasd_device *) cqr->startdev;
3463 struct ccw_device *cdev = device->cdev;
3464
3465 switch (cdev->id.cu_type) {
3466 case 0x3990:
3467 case 0x2105:
3468 case 0x2107:
3469 case 0x1750:
3470 return dasd_3990_erp_action;
3471 case 0x9343:
3472 case 0x3880:
3473 default:
3474 return dasd_default_erp_action;
3475 }
3476 }
3477
3478 static dasd_erp_fn_t
3479 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
3480 {
3481 return dasd_default_erp_postaction;
3482 }
3483
3484 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
3485 struct dasd_ccw_req *cqr,
3486 struct irb *irb)
3487 {
3488 char mask;
3489 char *sense = NULL;
3490 struct dasd_eckd_private *private = device->private;
3491
3492 /* first of all check for state change pending interrupt */
3493 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
3494 if ((scsw_dstat(&irb->scsw) & mask) == mask) {
3495 /*
3496 * for alias only, not in offline processing
3497 * and only if not suspended
3498 */
3499 if (!device->block && private->lcu &&
3500 device->state == DASD_STATE_ONLINE &&
3501 !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
3502 !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
3503 /* schedule worker to reload device */
3504 dasd_reload_device(device);
3505 }
3506 dasd_generic_handle_state_change(device);
3507 return;
3508 }
3509
3510 sense = dasd_get_sense(irb);
3511 if (!sense)
3512 return;
3513
3514 /* summary unit check */
3515 if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
3516 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
3517 if (test_and_set_bit(DASD_FLAG_SUC, &device->flags)) {
3518 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3519 "eckd suc: device already notified");
3520 return;
3521 }
3522 sense = dasd_get_sense(irb);
3523 if (!sense) {
3524 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3525 "eckd suc: no reason code available");
3526 clear_bit(DASD_FLAG_SUC, &device->flags);
3527 return;
3528
3529 }
3530 private->suc_reason = sense[8];
3531 DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
3532 "eckd handle summary unit check: reason",
3533 private->suc_reason);
3534 dasd_get_device(device);
3535 if (!schedule_work(&device->suc_work))
3536 dasd_put_device(device);
3537
3538 return;
3539 }
3540
3541 /* service information message SIM */
3542 if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
3543 ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
3544 dasd_3990_erp_handle_sim(device, sense);
3545 return;
3546 }
3547
3548 /* loss of device reservation is handled via base devices only
3549 * as alias devices may be used with several bases
3550 */
3551 if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
3552 (sense[7] == 0x3F) &&
3553 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
3554 test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
3555 if (device->features & DASD_FEATURE_FAILONSLCK)
3556 set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
3557 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3558 dev_err(&device->cdev->dev,
3559 "The device reservation was lost\n");
3560 }
3561 }
3562
3563 static int dasd_eckd_ras_sanity_checks(struct dasd_device *device,
3564 unsigned int first_trk,
3565 unsigned int last_trk)
3566 {
3567 struct dasd_eckd_private *private = device->private;
3568 unsigned int trks_per_vol;
3569 int rc = 0;
3570
3571 trks_per_vol = private->real_cyl * private->rdc_data.trk_per_cyl;
3572
3573 if (first_trk >= trks_per_vol) {
3574 dev_warn(&device->cdev->dev,
3575 "Start track number %u used in the space release command is too big\n",
3576 first_trk);
3577 rc = -EINVAL;
3578 } else if (last_trk >= trks_per_vol) {
3579 dev_warn(&device->cdev->dev,
3580 "Stop track number %u used in the space release command is too big\n",
3581 last_trk);
3582 rc = -EINVAL;
3583 } else if (first_trk > last_trk) {
3584 dev_warn(&device->cdev->dev,
3585 "Start track %u used in the space release command exceeds the end track\n",
3586 first_trk);
3587 rc = -EINVAL;
3588 }
3589 return rc;
3590 }
3591
3592 /*
3593 * Helper function to count the amount of involved extents within a given range
3594 * with extent alignment in mind.
3595 */
3596 static int count_exts(unsigned int from, unsigned int to, int trks_per_ext)
3597 {
3598 int cur_pos = 0;
3599 int count = 0;
3600 int tmp;
3601
3602 if (from == to)
3603 return 1;
3604
3605 /* Count first partial extent */
3606 if (from % trks_per_ext != 0) {
3607 tmp = from + trks_per_ext - (from % trks_per_ext) - 1;
3608 if (tmp > to)
3609 tmp = to;
3610 cur_pos = tmp - from + 1;
3611 count++;
3612 }
3613 /* Count full extents */
3614 if (to - (from + cur_pos) + 1 >= trks_per_ext) {
3615 tmp = to - ((to - trks_per_ext + 1) % trks_per_ext);
3616 count += (tmp - (from + cur_pos) + 1) / trks_per_ext;
3617 cur_pos = tmp;
3618 }
3619 /* Count last partial extent */
3620 if (cur_pos < to)
3621 count++;
3622
3623 return count;
3624 }
3625
3626 /*
3627 * Release allocated space for a given range or an entire volume.
3628 */
3629 static struct dasd_ccw_req *
3630 dasd_eckd_dso_ras(struct dasd_device *device, struct dasd_block *block,
3631 struct request *req, unsigned int first_trk,
3632 unsigned int last_trk, int by_extent)
3633 {
3634 struct dasd_eckd_private *private = device->private;
3635 struct dasd_dso_ras_ext_range *ras_range;
3636 struct dasd_rssd_features *features;
3637 struct dasd_dso_ras_data *ras_data;
3638 u16 heads, beg_head, end_head;
3639 int cur_to_trk, cur_from_trk;
3640 struct dasd_ccw_req *cqr;
3641 u32 beg_cyl, end_cyl;
3642 struct ccw1 *ccw;
3643 int trks_per_ext;
3644 size_t ras_size;
3645 size_t size;
3646 int nr_exts;
3647 void *rq;
3648 int i;
3649
3650 if (dasd_eckd_ras_sanity_checks(device, first_trk, last_trk))
3651 return ERR_PTR(-EINVAL);
3652
3653 rq = req ? blk_mq_rq_to_pdu(req) : NULL;
3654
3655 features = &private->features;
3656
3657 trks_per_ext = dasd_eckd_ext_size(device) * private->rdc_data.trk_per_cyl;
3658 nr_exts = 0;
3659 if (by_extent)
3660 nr_exts = count_exts(first_trk, last_trk, trks_per_ext);
3661 ras_size = sizeof(*ras_data);
3662 size = ras_size + (nr_exts * sizeof(*ras_range));
3663
3664 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, size, device, rq);
3665 if (IS_ERR(cqr)) {
3666 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
3667 "Could not allocate RAS request");
3668 return cqr;
3669 }
3670
3671 ras_data = cqr->data;
3672 memset(ras_data, 0, size);
3673
3674 ras_data->order = DSO_ORDER_RAS;
3675 ras_data->flags.vol_type = 0; /* CKD volume */
3676 /* Release specified extents or entire volume */
3677 ras_data->op_flags.by_extent = by_extent;
3678 /*
3679 * This bit guarantees initialisation of tracks within an extent that is
3680 * not fully specified, but is only supported with a certain feature
3681 * subset.
3682 */
3683 ras_data->op_flags.guarantee_init = !!(features->feature[56] & 0x01);
3684 ras_data->lss = private->ned->ID;
3685 ras_data->dev_addr = private->ned->unit_addr;
3686 ras_data->nr_exts = nr_exts;
3687
3688 if (by_extent) {
3689 heads = private->rdc_data.trk_per_cyl;
3690 cur_from_trk = first_trk;
3691 cur_to_trk = first_trk + trks_per_ext -
3692 (first_trk % trks_per_ext) - 1;
3693 if (cur_to_trk > last_trk)
3694 cur_to_trk = last_trk;
3695 ras_range = (struct dasd_dso_ras_ext_range *)(cqr->data + ras_size);
3696
3697 for (i = 0; i < nr_exts; i++) {
3698 beg_cyl = cur_from_trk / heads;
3699 beg_head = cur_from_trk % heads;
3700 end_cyl = cur_to_trk / heads;
3701 end_head = cur_to_trk % heads;
3702
3703 set_ch_t(&ras_range->beg_ext, beg_cyl, beg_head);
3704 set_ch_t(&ras_range->end_ext, end_cyl, end_head);
3705
3706 cur_from_trk = cur_to_trk + 1;
3707 cur_to_trk = cur_from_trk + trks_per_ext - 1;
3708 if (cur_to_trk > last_trk)
3709 cur_to_trk = last_trk;
3710 ras_range++;
3711 }
3712 }
3713
3714 ccw = cqr->cpaddr;
3715 ccw->cda = (__u32)(addr_t)cqr->data;
3716 ccw->cmd_code = DASD_ECKD_CCW_DSO;
3717 ccw->count = size;
3718
3719 cqr->startdev = device;
3720 cqr->memdev = device;
3721 cqr->block = block;
3722 cqr->retries = 256;
3723 cqr->expires = device->default_expires * HZ;
3724 cqr->buildclk = get_tod_clock();
3725 cqr->status = DASD_CQR_FILLED;
3726
3727 return cqr;
3728 }
3729
3730 static int dasd_eckd_release_space_full(struct dasd_device *device)
3731 {
3732 struct dasd_ccw_req *cqr;
3733 int rc;
3734
3735 cqr = dasd_eckd_dso_ras(device, NULL, NULL, 0, 0, 0);
3736 if (IS_ERR(cqr))
3737 return PTR_ERR(cqr);
3738
3739 rc = dasd_sleep_on_interruptible(cqr);
3740
3741 dasd_sfree_request(cqr, cqr->memdev);
3742
3743 return rc;
3744 }
3745
3746 static int dasd_eckd_release_space_trks(struct dasd_device *device,
3747 unsigned int from, unsigned int to)
3748 {
3749 struct dasd_eckd_private *private = device->private;
3750 struct dasd_block *block = device->block;
3751 struct dasd_ccw_req *cqr, *n;
3752 struct list_head ras_queue;
3753 unsigned int device_exts;
3754 int trks_per_ext;
3755 int stop, step;
3756 int cur_pos;
3757 int rc = 0;
3758 int retry;
3759
3760 INIT_LIST_HEAD(&ras_queue);
3761
3762 device_exts = private->real_cyl / dasd_eckd_ext_size(device);
3763 trks_per_ext = dasd_eckd_ext_size(device) * private->rdc_data.trk_per_cyl;
3764
3765 /* Make sure device limits are not exceeded */
3766 step = trks_per_ext * min(device_exts, DASD_ECKD_RAS_EXTS_MAX);
3767 cur_pos = from;
3768
3769 do {
3770 retry = 0;
3771 while (cur_pos < to) {
3772 stop = cur_pos + step -
3773 ((cur_pos + step) % trks_per_ext) - 1;
3774 if (stop > to)
3775 stop = to;
3776
3777 cqr = dasd_eckd_dso_ras(device, NULL, NULL, cur_pos, stop, 1);
3778 if (IS_ERR(cqr)) {
3779 rc = PTR_ERR(cqr);
3780 if (rc == -ENOMEM) {
3781 if (list_empty(&ras_queue))
3782 goto out;
3783 retry = 1;
3784 break;
3785 }
3786 goto err_out;
3787 }
3788
3789 spin_lock_irq(&block->queue_lock);
3790 list_add_tail(&cqr->blocklist, &ras_queue);
3791 spin_unlock_irq(&block->queue_lock);
3792 cur_pos = stop + 1;
3793 }
3794
3795 rc = dasd_sleep_on_queue_interruptible(&ras_queue);
3796
3797 err_out:
3798 list_for_each_entry_safe(cqr, n, &ras_queue, blocklist) {
3799 device = cqr->startdev;
3800 private = device->private;
3801
3802 spin_lock_irq(&block->queue_lock);
3803 list_del_init(&cqr->blocklist);
3804 spin_unlock_irq(&block->queue_lock);
3805 dasd_sfree_request(cqr, device);
3806 private->count--;
3807 }
3808 } while (retry);
3809
3810 out:
3811 return rc;
3812 }
3813
3814 static int dasd_eckd_release_space(struct dasd_device *device,
3815 struct format_data_t *rdata)
3816 {
3817 if (rdata->intensity & DASD_FMT_INT_ESE_FULL)
3818 return dasd_eckd_release_space_full(device);
3819 else if (rdata->intensity == 0)
3820 return dasd_eckd_release_space_trks(device, rdata->start_unit,
3821 rdata->stop_unit);
3822 else
3823 return -EINVAL;
3824 }
3825
3826 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
3827 struct dasd_device *startdev,
3828 struct dasd_block *block,
3829 struct request *req,
3830 sector_t first_rec,
3831 sector_t last_rec,
3832 sector_t first_trk,
3833 sector_t last_trk,
3834 unsigned int first_offs,
3835 unsigned int last_offs,
3836 unsigned int blk_per_trk,
3837 unsigned int blksize)
3838 {
3839 struct dasd_eckd_private *private;
3840 unsigned long *idaws;
3841 struct LO_eckd_data *LO_data;
3842 struct dasd_ccw_req *cqr;
3843 struct ccw1 *ccw;
3844 struct req_iterator iter;
3845 struct bio_vec bv;
3846 char *dst;
3847 unsigned int off;
3848 int count, cidaw, cplength, datasize;
3849 sector_t recid;
3850 unsigned char cmd, rcmd;
3851 int use_prefix;
3852 struct dasd_device *basedev;
3853
3854 basedev = block->base;
3855 private = basedev->private;
3856 if (rq_data_dir(req) == READ)
3857 cmd = DASD_ECKD_CCW_READ_MT;
3858 else if (rq_data_dir(req) == WRITE)
3859 cmd = DASD_ECKD_CCW_WRITE_MT;
3860 else
3861 return ERR_PTR(-EINVAL);
3862
3863 /* Check struct bio and count the number of blocks for the request. */
3864 count = 0;
3865 cidaw = 0;
3866 rq_for_each_segment(bv, req, iter) {
3867 if (bv.bv_len & (blksize - 1))
3868 /* Eckd can only do full blocks. */
3869 return ERR_PTR(-EINVAL);
3870 count += bv.bv_len >> (block->s2b_shift + 9);
3871 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
3872 cidaw += bv.bv_len >> (block->s2b_shift + 9);
3873 }
3874 /* Paranoia. */
3875 if (count != last_rec - first_rec + 1)
3876 return ERR_PTR(-EINVAL);
3877
3878 /* use the prefix command if available */
3879 use_prefix = private->features.feature[8] & 0x01;
3880 if (use_prefix) {
3881 /* 1x prefix + number of blocks */
3882 cplength = 2 + count;
3883 /* 1x prefix + cidaws*sizeof(long) */
3884 datasize = sizeof(struct PFX_eckd_data) +
3885 sizeof(struct LO_eckd_data) +
3886 cidaw * sizeof(unsigned long);
3887 } else {
3888 /* 1x define extent + 1x locate record + number of blocks */
3889 cplength = 2 + count;
3890 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
3891 datasize = sizeof(struct DE_eckd_data) +
3892 sizeof(struct LO_eckd_data) +
3893 cidaw * sizeof(unsigned long);
3894 }
3895 /* Find out the number of additional locate record ccws for cdl. */
3896 if (private->uses_cdl && first_rec < 2*blk_per_trk) {
3897 if (last_rec >= 2*blk_per_trk)
3898 count = 2*blk_per_trk - first_rec;
3899 cplength += count;
3900 datasize += count*sizeof(struct LO_eckd_data);
3901 }
3902 /* Allocate the ccw request. */
3903 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3904 startdev, blk_mq_rq_to_pdu(req));
3905 if (IS_ERR(cqr))
3906 return cqr;
3907 ccw = cqr->cpaddr;
3908 /* First ccw is define extent or prefix. */
3909 if (use_prefix) {
3910 if (prefix(ccw++, cqr->data, first_trk,
3911 last_trk, cmd, basedev, startdev) == -EAGAIN) {
3912 /* Clock not in sync and XRC is enabled.
3913 * Try again later.
3914 */
3915 dasd_sfree_request(cqr, startdev);
3916 return ERR_PTR(-EAGAIN);
3917 }
3918 idaws = (unsigned long *) (cqr->data +
3919 sizeof(struct PFX_eckd_data));
3920 } else {
3921 if (define_extent(ccw++, cqr->data, first_trk,
3922 last_trk, cmd, basedev, 0) == -EAGAIN) {
3923 /* Clock not in sync and XRC is enabled.
3924 * Try again later.
3925 */
3926 dasd_sfree_request(cqr, startdev);
3927 return ERR_PTR(-EAGAIN);
3928 }
3929 idaws = (unsigned long *) (cqr->data +
3930 sizeof(struct DE_eckd_data));
3931 }
3932 /* Build locate_record+read/write/ccws. */
3933 LO_data = (struct LO_eckd_data *) (idaws + cidaw);
3934 recid = first_rec;
3935 if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
3936 /* Only standard blocks so there is just one locate record. */
3937 ccw[-1].flags |= CCW_FLAG_CC;
3938 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
3939 last_rec - recid + 1, cmd, basedev, blksize);
3940 }
3941 rq_for_each_segment(bv, req, iter) {
3942 dst = page_address(bv.bv_page) + bv.bv_offset;
3943 if (dasd_page_cache) {
3944 char *copy = kmem_cache_alloc(dasd_page_cache,
3945 GFP_DMA | __GFP_NOWARN);
3946 if (copy && rq_data_dir(req) == WRITE)
3947 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
3948 if (copy)
3949 dst = copy + bv.bv_offset;
3950 }
3951 for (off = 0; off < bv.bv_len; off += blksize) {
3952 sector_t trkid = recid;
3953 unsigned int recoffs = sector_div(trkid, blk_per_trk);
3954 rcmd = cmd;
3955 count = blksize;
3956 /* Locate record for cdl special block ? */
3957 if (private->uses_cdl && recid < 2*blk_per_trk) {
3958 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
3959 rcmd |= 0x8;
3960 count = dasd_eckd_cdl_reclen(recid);
3961 if (count < blksize &&
3962 rq_data_dir(req) == READ)
3963 memset(dst + count, 0xe5,
3964 blksize - count);
3965 }
3966 ccw[-1].flags |= CCW_FLAG_CC;
3967 locate_record(ccw++, LO_data++,
3968 trkid, recoffs + 1,
3969 1, rcmd, basedev, count);
3970 }
3971 /* Locate record for standard blocks ? */
3972 if (private->uses_cdl && recid == 2*blk_per_trk) {
3973 ccw[-1].flags |= CCW_FLAG_CC;
3974 locate_record(ccw++, LO_data++,
3975 trkid, recoffs + 1,
3976 last_rec - recid + 1,
3977 cmd, basedev, count);
3978 }
3979 /* Read/write ccw. */
3980 ccw[-1].flags |= CCW_FLAG_CC;
3981 ccw->cmd_code = rcmd;
3982 ccw->count = count;
3983 if (idal_is_needed(dst, blksize)) {
3984 ccw->cda = (__u32)(addr_t) idaws;
3985 ccw->flags = CCW_FLAG_IDA;
3986 idaws = idal_create_words(idaws, dst, blksize);
3987 } else {
3988 ccw->cda = (__u32)(addr_t) dst;
3989 ccw->flags = 0;
3990 }
3991 ccw++;
3992 dst += blksize;
3993 recid++;
3994 }
3995 }
3996 if (blk_noretry_request(req) ||
3997 block->base->features & DASD_FEATURE_FAILFAST)
3998 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3999 cqr->startdev = startdev;
4000 cqr->memdev = startdev;
4001 cqr->block = block;
4002 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
4003 cqr->lpm = dasd_path_get_ppm(startdev);
4004 cqr->retries = startdev->default_retries;
4005 cqr->buildclk = get_tod_clock();
4006 cqr->status = DASD_CQR_FILLED;
4007
4008 /* Set flags to suppress output for expected errors */
4009 if (dasd_eckd_is_ese(basedev)) {
4010 set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
4011 set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
4012 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4013 }
4014
4015 return cqr;
4016 }
4017
4018 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
4019 struct dasd_device *startdev,
4020 struct dasd_block *block,
4021 struct request *req,
4022 sector_t first_rec,
4023 sector_t last_rec,
4024 sector_t first_trk,
4025 sector_t last_trk,
4026 unsigned int first_offs,
4027 unsigned int last_offs,
4028 unsigned int blk_per_trk,
4029 unsigned int blksize)
4030 {
4031 unsigned long *idaws;
4032 struct dasd_ccw_req *cqr;
4033 struct ccw1 *ccw;
4034 struct req_iterator iter;
4035 struct bio_vec bv;
4036 char *dst, *idaw_dst;
4037 unsigned int cidaw, cplength, datasize;
4038 unsigned int tlf;
4039 sector_t recid;
4040 unsigned char cmd;
4041 struct dasd_device *basedev;
4042 unsigned int trkcount, count, count_to_trk_end;
4043 unsigned int idaw_len, seg_len, part_len, len_to_track_end;
4044 unsigned char new_track, end_idaw;
4045 sector_t trkid;
4046 unsigned int recoffs;
4047
4048 basedev = block->base;
4049 if (rq_data_dir(req) == READ)
4050 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
4051 else if (rq_data_dir(req) == WRITE)
4052 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
4053 else
4054 return ERR_PTR(-EINVAL);
4055
4056 /* Track based I/O needs IDAWs for each page, and not just for
4057 * 64 bit addresses. We need additional idals for pages
4058 * that get filled from two tracks, so we use the number
4059 * of records as upper limit.
4060 */
4061 cidaw = last_rec - first_rec + 1;
4062 trkcount = last_trk - first_trk + 1;
4063
4064 /* 1x prefix + one read/write ccw per track */
4065 cplength = 1 + trkcount;
4066
4067 datasize = sizeof(struct PFX_eckd_data) + cidaw * sizeof(unsigned long);
4068
4069 /* Allocate the ccw request. */
4070 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
4071 startdev, blk_mq_rq_to_pdu(req));
4072 if (IS_ERR(cqr))
4073 return cqr;
4074 ccw = cqr->cpaddr;
4075 /* transfer length factor: how many bytes to read from the last track */
4076 if (first_trk == last_trk)
4077 tlf = last_offs - first_offs + 1;
4078 else
4079 tlf = last_offs + 1;
4080 tlf *= blksize;
4081
4082 if (prefix_LRE(ccw++, cqr->data, first_trk,
4083 last_trk, cmd, basedev, startdev,
4084 1 /* format */, first_offs + 1,
4085 trkcount, blksize,
4086 tlf) == -EAGAIN) {
4087 /* Clock not in sync and XRC is enabled.
4088 * Try again later.
4089 */
4090 dasd_sfree_request(cqr, startdev);
4091 return ERR_PTR(-EAGAIN);
4092 }
4093
4094 /*
4095 * The translation of request into ccw programs must meet the
4096 * following conditions:
4097 * - all idaws but the first and the last must address full pages
4098 * (or 2K blocks on 31-bit)
4099 * - the scope of a ccw and it's idal ends with the track boundaries
4100 */
4101 idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
4102 recid = first_rec;
4103 new_track = 1;
4104 end_idaw = 0;
4105 len_to_track_end = 0;
4106 idaw_dst = NULL;
4107 idaw_len = 0;
4108 rq_for_each_segment(bv, req, iter) {
4109 dst = page_address(bv.bv_page) + bv.bv_offset;
4110 seg_len = bv.bv_len;
4111 while (seg_len) {
4112 if (new_track) {
4113 trkid = recid;
4114 recoffs = sector_div(trkid, blk_per_trk);
4115 count_to_trk_end = blk_per_trk - recoffs;
4116 count = min((last_rec - recid + 1),
4117 (sector_t)count_to_trk_end);
4118 len_to_track_end = count * blksize;
4119 ccw[-1].flags |= CCW_FLAG_CC;
4120 ccw->cmd_code = cmd;
4121 ccw->count = len_to_track_end;
4122 ccw->cda = (__u32)(addr_t)idaws;
4123 ccw->flags = CCW_FLAG_IDA;
4124 ccw++;
4125 recid += count;
4126 new_track = 0;
4127 /* first idaw for a ccw may start anywhere */
4128 if (!idaw_dst)
4129 idaw_dst = dst;
4130 }
4131 /* If we start a new idaw, we must make sure that it
4132 * starts on an IDA_BLOCK_SIZE boundary.
4133 * If we continue an idaw, we must make sure that the
4134 * current segment begins where the so far accumulated
4135 * idaw ends
4136 */
4137 if (!idaw_dst) {
4138 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
4139 dasd_sfree_request(cqr, startdev);
4140 return ERR_PTR(-ERANGE);
4141 } else
4142 idaw_dst = dst;
4143 }
4144 if ((idaw_dst + idaw_len) != dst) {
4145 dasd_sfree_request(cqr, startdev);
4146 return ERR_PTR(-ERANGE);
4147 }
4148 part_len = min(seg_len, len_to_track_end);
4149 seg_len -= part_len;
4150 dst += part_len;
4151 idaw_len += part_len;
4152 len_to_track_end -= part_len;
4153 /* collected memory area ends on an IDA_BLOCK border,
4154 * -> create an idaw
4155 * idal_create_words will handle cases where idaw_len
4156 * is larger then IDA_BLOCK_SIZE
4157 */
4158 if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
4159 end_idaw = 1;
4160 /* We also need to end the idaw at track end */
4161 if (!len_to_track_end) {
4162 new_track = 1;
4163 end_idaw = 1;
4164 }
4165 if (end_idaw) {
4166 idaws = idal_create_words(idaws, idaw_dst,
4167 idaw_len);
4168 idaw_dst = NULL;
4169 idaw_len = 0;
4170 end_idaw = 0;
4171 }
4172 }
4173 }
4174
4175 if (blk_noretry_request(req) ||
4176 block->base->features & DASD_FEATURE_FAILFAST)
4177 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4178 cqr->startdev = startdev;
4179 cqr->memdev = startdev;
4180 cqr->block = block;
4181 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
4182 cqr->lpm = dasd_path_get_ppm(startdev);
4183 cqr->retries = startdev->default_retries;
4184 cqr->buildclk = get_tod_clock();
4185 cqr->status = DASD_CQR_FILLED;
4186
4187 /* Set flags to suppress output for expected errors */
4188 if (dasd_eckd_is_ese(basedev))
4189 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4190
4191 return cqr;
4192 }
4193
4194 static int prepare_itcw(struct itcw *itcw,
4195 unsigned int trk, unsigned int totrk, int cmd,
4196 struct dasd_device *basedev,
4197 struct dasd_device *startdev,
4198 unsigned int rec_on_trk, int count,
4199 unsigned int blksize,
4200 unsigned int total_data_size,
4201 unsigned int tlf,
4202 unsigned int blk_per_trk)
4203 {
4204 struct PFX_eckd_data pfxdata;
4205 struct dasd_eckd_private *basepriv, *startpriv;
4206 struct DE_eckd_data *dedata;
4207 struct LRE_eckd_data *lredata;
4208 struct dcw *dcw;
4209
4210 u32 begcyl, endcyl;
4211 u16 heads, beghead, endhead;
4212 u8 pfx_cmd;
4213
4214 int rc = 0;
4215 int sector = 0;
4216 int dn, d;
4217
4218
4219 /* setup prefix data */
4220 basepriv = basedev->private;
4221 startpriv = startdev->private;
4222 dedata = &pfxdata.define_extent;
4223 lredata = &pfxdata.locate_record;
4224
4225 memset(&pfxdata, 0, sizeof(pfxdata));
4226 pfxdata.format = 1; /* PFX with LRE */
4227 pfxdata.base_address = basepriv->ned->unit_addr;
4228 pfxdata.base_lss = basepriv->ned->ID;
4229 pfxdata.validity.define_extent = 1;
4230
4231 /* private uid is kept up to date, conf_data may be outdated */
4232 if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
4233 pfxdata.validity.verify_base = 1;
4234
4235 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
4236 pfxdata.validity.verify_base = 1;
4237 pfxdata.validity.hyper_pav = 1;
4238 }
4239
4240 switch (cmd) {
4241 case DASD_ECKD_CCW_READ_TRACK_DATA:
4242 dedata->mask.perm = 0x1;
4243 dedata->attributes.operation = basepriv->attrib.operation;
4244 dedata->blk_size = blksize;
4245 dedata->ga_extended |= 0x42;
4246 lredata->operation.orientation = 0x0;
4247 lredata->operation.operation = 0x0C;
4248 lredata->auxiliary.check_bytes = 0x01;
4249 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
4250 break;
4251 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
4252 dedata->mask.perm = 0x02;
4253 dedata->attributes.operation = basepriv->attrib.operation;
4254 dedata->blk_size = blksize;
4255 rc = set_timestamp(NULL, dedata, basedev);
4256 dedata->ga_extended |= 0x42;
4257 lredata->operation.orientation = 0x0;
4258 lredata->operation.operation = 0x3F;
4259 lredata->extended_operation = 0x23;
4260 lredata->auxiliary.check_bytes = 0x2;
4261 /*
4262 * If XRC is supported the System Time Stamp is set. The
4263 * validity of the time stamp must be reflected in the prefix
4264 * data as well.
4265 */
4266 if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
4267 pfxdata.validity.time_stamp = 1; /* 'Time Stamp Valid' */
4268 pfx_cmd = DASD_ECKD_CCW_PFX;
4269 break;
4270 case DASD_ECKD_CCW_READ_COUNT_MT:
4271 dedata->mask.perm = 0x1;
4272 dedata->attributes.operation = DASD_BYPASS_CACHE;
4273 dedata->ga_extended |= 0x42;
4274 dedata->blk_size = blksize;
4275 lredata->operation.orientation = 0x2;
4276 lredata->operation.operation = 0x16;
4277 lredata->auxiliary.check_bytes = 0x01;
4278 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
4279 break;
4280 default:
4281 DBF_DEV_EVENT(DBF_ERR, basedev,
4282 "prepare itcw, unknown opcode 0x%x", cmd);
4283 BUG();
4284 break;
4285 }
4286 if (rc)
4287 return rc;
4288
4289 dedata->attributes.mode = 0x3; /* ECKD */
4290
4291 heads = basepriv->rdc_data.trk_per_cyl;
4292 begcyl = trk / heads;
4293 beghead = trk % heads;
4294 endcyl = totrk / heads;
4295 endhead = totrk % heads;
4296
4297 /* check for sequential prestage - enhance cylinder range */
4298 if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
4299 dedata->attributes.operation == DASD_SEQ_ACCESS) {
4300
4301 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
4302 endcyl += basepriv->attrib.nr_cyl;
4303 else
4304 endcyl = (basepriv->real_cyl - 1);
4305 }
4306
4307 set_ch_t(&dedata->beg_ext, begcyl, beghead);
4308 set_ch_t(&dedata->end_ext, endcyl, endhead);
4309
4310 dedata->ep_format = 0x20; /* records per track is valid */
4311 dedata->ep_rec_per_track = blk_per_trk;
4312
4313 if (rec_on_trk) {
4314 switch (basepriv->rdc_data.dev_type) {
4315 case 0x3390:
4316 dn = ceil_quot(blksize + 6, 232);
4317 d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
4318 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
4319 break;
4320 case 0x3380:
4321 d = 7 + ceil_quot(blksize + 12, 32);
4322 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
4323 break;
4324 }
4325 }
4326
4327 if (cmd == DASD_ECKD_CCW_READ_COUNT_MT) {
4328 lredata->auxiliary.length_valid = 0;
4329 lredata->auxiliary.length_scope = 0;
4330 lredata->sector = 0xff;
4331 } else {
4332 lredata->auxiliary.length_valid = 1;
4333 lredata->auxiliary.length_scope = 1;
4334 lredata->sector = sector;
4335 }
4336 lredata->auxiliary.imbedded_ccw_valid = 1;
4337 lredata->length = tlf;
4338 lredata->imbedded_ccw = cmd;
4339 lredata->count = count;
4340 set_ch_t(&lredata->seek_addr, begcyl, beghead);
4341 lredata->search_arg.cyl = lredata->seek_addr.cyl;
4342 lredata->search_arg.head = lredata->seek_addr.head;
4343 lredata->search_arg.record = rec_on_trk;
4344
4345 dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
4346 &pfxdata, sizeof(pfxdata), total_data_size);
4347 return PTR_ERR_OR_ZERO(dcw);
4348 }
4349
4350 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
4351 struct dasd_device *startdev,
4352 struct dasd_block *block,
4353 struct request *req,
4354 sector_t first_rec,
4355 sector_t last_rec,
4356 sector_t first_trk,
4357 sector_t last_trk,
4358 unsigned int first_offs,
4359 unsigned int last_offs,
4360 unsigned int blk_per_trk,
4361 unsigned int blksize)
4362 {
4363 struct dasd_ccw_req *cqr;
4364 struct req_iterator iter;
4365 struct bio_vec bv;
4366 char *dst;
4367 unsigned int trkcount, ctidaw;
4368 unsigned char cmd;
4369 struct dasd_device *basedev;
4370 unsigned int tlf;
4371 struct itcw *itcw;
4372 struct tidaw *last_tidaw = NULL;
4373 int itcw_op;
4374 size_t itcw_size;
4375 u8 tidaw_flags;
4376 unsigned int seg_len, part_len, len_to_track_end;
4377 unsigned char new_track;
4378 sector_t recid, trkid;
4379 unsigned int offs;
4380 unsigned int count, count_to_trk_end;
4381 int ret;
4382
4383 basedev = block->base;
4384 if (rq_data_dir(req) == READ) {
4385 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
4386 itcw_op = ITCW_OP_READ;
4387 } else if (rq_data_dir(req) == WRITE) {
4388 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
4389 itcw_op = ITCW_OP_WRITE;
4390 } else
4391 return ERR_PTR(-EINVAL);
4392
4393 /* trackbased I/O needs address all memory via TIDAWs,
4394 * not just for 64 bit addresses. This allows us to map
4395 * each segment directly to one tidaw.
4396 * In the case of write requests, additional tidaws may
4397 * be needed when a segment crosses a track boundary.
4398 */
4399 trkcount = last_trk - first_trk + 1;
4400 ctidaw = 0;
4401 rq_for_each_segment(bv, req, iter) {
4402 ++ctidaw;
4403 }
4404 if (rq_data_dir(req) == WRITE)
4405 ctidaw += (last_trk - first_trk);
4406
4407 /* Allocate the ccw request. */
4408 itcw_size = itcw_calc_size(0, ctidaw, 0);
4409 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev,
4410 blk_mq_rq_to_pdu(req));
4411 if (IS_ERR(cqr))
4412 return cqr;
4413
4414 /* transfer length factor: how many bytes to read from the last track */
4415 if (first_trk == last_trk)
4416 tlf = last_offs - first_offs + 1;
4417 else
4418 tlf = last_offs + 1;
4419 tlf *= blksize;
4420
4421 itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
4422 if (IS_ERR(itcw)) {
4423 ret = -EINVAL;
4424 goto out_error;
4425 }
4426 cqr->cpaddr = itcw_get_tcw(itcw);
4427 if (prepare_itcw(itcw, first_trk, last_trk,
4428 cmd, basedev, startdev,
4429 first_offs + 1,
4430 trkcount, blksize,
4431 (last_rec - first_rec + 1) * blksize,
4432 tlf, blk_per_trk) == -EAGAIN) {
4433 /* Clock not in sync and XRC is enabled.
4434 * Try again later.
4435 */
4436 ret = -EAGAIN;
4437 goto out_error;
4438 }
4439 len_to_track_end = 0;
4440 /*
4441 * A tidaw can address 4k of memory, but must not cross page boundaries
4442 * We can let the block layer handle this by setting
4443 * blk_queue_segment_boundary to page boundaries and
4444 * blk_max_segment_size to page size when setting up the request queue.
4445 * For write requests, a TIDAW must not cross track boundaries, because
4446 * we have to set the CBC flag on the last tidaw for each track.
4447 */
4448 if (rq_data_dir(req) == WRITE) {
4449 new_track = 1;
4450 recid = first_rec;
4451 rq_for_each_segment(bv, req, iter) {
4452 dst = page_address(bv.bv_page) + bv.bv_offset;
4453 seg_len = bv.bv_len;
4454 while (seg_len) {
4455 if (new_track) {
4456 trkid = recid;
4457 offs = sector_div(trkid, blk_per_trk);
4458 count_to_trk_end = blk_per_trk - offs;
4459 count = min((last_rec - recid + 1),
4460 (sector_t)count_to_trk_end);
4461 len_to_track_end = count * blksize;
4462 recid += count;
4463 new_track = 0;
4464 }
4465 part_len = min(seg_len, len_to_track_end);
4466 seg_len -= part_len;
4467 len_to_track_end -= part_len;
4468 /* We need to end the tidaw at track end */
4469 if (!len_to_track_end) {
4470 new_track = 1;
4471 tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
4472 } else
4473 tidaw_flags = 0;
4474 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
4475 dst, part_len);
4476 if (IS_ERR(last_tidaw)) {
4477 ret = -EINVAL;
4478 goto out_error;
4479 }
4480 dst += part_len;
4481 }
4482 }
4483 } else {
4484 rq_for_each_segment(bv, req, iter) {
4485 dst = page_address(bv.bv_page) + bv.bv_offset;
4486 last_tidaw = itcw_add_tidaw(itcw, 0x00,
4487 dst, bv.bv_len);
4488 if (IS_ERR(last_tidaw)) {
4489 ret = -EINVAL;
4490 goto out_error;
4491 }
4492 }
4493 }
4494 last_tidaw->flags |= TIDAW_FLAGS_LAST;
4495 last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
4496 itcw_finalize(itcw);
4497
4498 if (blk_noretry_request(req) ||
4499 block->base->features & DASD_FEATURE_FAILFAST)
4500 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4501 cqr->cpmode = 1;
4502 cqr->startdev = startdev;
4503 cqr->memdev = startdev;
4504 cqr->block = block;
4505 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
4506 cqr->lpm = dasd_path_get_ppm(startdev);
4507 cqr->retries = startdev->default_retries;
4508 cqr->buildclk = get_tod_clock();
4509 cqr->status = DASD_CQR_FILLED;
4510
4511 /* Set flags to suppress output for expected errors */
4512 if (dasd_eckd_is_ese(basedev)) {
4513 set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
4514 set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
4515 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
4516 }
4517
4518 return cqr;
4519 out_error:
4520 dasd_sfree_request(cqr, startdev);
4521 return ERR_PTR(ret);
4522 }
4523
4524 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
4525 struct dasd_block *block,
4526 struct request *req)
4527 {
4528 int cmdrtd, cmdwtd;
4529 int use_prefix;
4530 int fcx_multitrack;
4531 struct dasd_eckd_private *private;
4532 struct dasd_device *basedev;
4533 sector_t first_rec, last_rec;
4534 sector_t first_trk, last_trk;
4535 unsigned int first_offs, last_offs;
4536 unsigned int blk_per_trk, blksize;
4537 int cdlspecial;
4538 unsigned int data_size;
4539 struct dasd_ccw_req *cqr;
4540
4541 basedev = block->base;
4542 private = basedev->private;
4543
4544 /* Calculate number of blocks/records per track. */
4545 blksize = block->bp_block;
4546 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
4547 if (blk_per_trk == 0)
4548 return ERR_PTR(-EINVAL);
4549 /* Calculate record id of first and last block. */
4550 first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
4551 first_offs = sector_div(first_trk, blk_per_trk);
4552 last_rec = last_trk =
4553 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
4554 last_offs = sector_div(last_trk, blk_per_trk);
4555 cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
4556
4557 fcx_multitrack = private->features.feature[40] & 0x20;
4558 data_size = blk_rq_bytes(req);
4559 if (data_size % blksize)
4560 return ERR_PTR(-EINVAL);
4561 /* tpm write request add CBC data on each track boundary */
4562 if (rq_data_dir(req) == WRITE)
4563 data_size += (last_trk - first_trk) * 4;
4564
4565 /* is read track data and write track data in command mode supported? */
4566 cmdrtd = private->features.feature[9] & 0x20;
4567 cmdwtd = private->features.feature[12] & 0x40;
4568 use_prefix = private->features.feature[8] & 0x01;
4569
4570 cqr = NULL;
4571 if (cdlspecial || dasd_page_cache) {
4572 /* do nothing, just fall through to the cmd mode single case */
4573 } else if ((data_size <= private->fcx_max_data)
4574 && (fcx_multitrack || (first_trk == last_trk))) {
4575 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
4576 first_rec, last_rec,
4577 first_trk, last_trk,
4578 first_offs, last_offs,
4579 blk_per_trk, blksize);
4580 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
4581 (PTR_ERR(cqr) != -ENOMEM))
4582 cqr = NULL;
4583 } else if (use_prefix &&
4584 (((rq_data_dir(req) == READ) && cmdrtd) ||
4585 ((rq_data_dir(req) == WRITE) && cmdwtd))) {
4586 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
4587 first_rec, last_rec,
4588 first_trk, last_trk,
4589 first_offs, last_offs,
4590 blk_per_trk, blksize);
4591 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
4592 (PTR_ERR(cqr) != -ENOMEM))
4593 cqr = NULL;
4594 }
4595 if (!cqr)
4596 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
4597 first_rec, last_rec,
4598 first_trk, last_trk,
4599 first_offs, last_offs,
4600 blk_per_trk, blksize);
4601 return cqr;
4602 }
4603
4604 static struct dasd_ccw_req *dasd_eckd_build_cp_raw(struct dasd_device *startdev,
4605 struct dasd_block *block,
4606 struct request *req)
4607 {
4608 sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
4609 unsigned int seg_len, len_to_track_end;
4610 unsigned int cidaw, cplength, datasize;
4611 sector_t first_trk, last_trk, sectors;
4612 struct dasd_eckd_private *base_priv;
4613 struct dasd_device *basedev;
4614 struct req_iterator iter;
4615 struct dasd_ccw_req *cqr;
4616 unsigned int first_offs;
4617 unsigned int trkcount;
4618 unsigned long *idaws;
4619 unsigned int size;
4620 unsigned char cmd;
4621 struct bio_vec bv;
4622 struct ccw1 *ccw;
4623 int use_prefix;
4624 void *data;
4625 char *dst;
4626
4627 /*
4628 * raw track access needs to be mutiple of 64k and on 64k boundary
4629 * For read requests we can fix an incorrect alignment by padding
4630 * the request with dummy pages.
4631 */
4632 start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
4633 end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
4634 DASD_RAW_SECTORS_PER_TRACK;
4635 end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
4636 DASD_RAW_SECTORS_PER_TRACK;
4637 basedev = block->base;
4638 if ((start_padding_sectors || end_padding_sectors) &&
4639 (rq_data_dir(req) == WRITE)) {
4640 DBF_DEV_EVENT(DBF_ERR, basedev,
4641 "raw write not track aligned (%llu,%llu) req %p",
4642 start_padding_sectors, end_padding_sectors, req);
4643 return ERR_PTR(-EINVAL);
4644 }
4645
4646 first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
4647 last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
4648 DASD_RAW_SECTORS_PER_TRACK;
4649 trkcount = last_trk - first_trk + 1;
4650 first_offs = 0;
4651
4652 if (rq_data_dir(req) == READ)
4653 cmd = DASD_ECKD_CCW_READ_TRACK;
4654 else if (rq_data_dir(req) == WRITE)
4655 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
4656 else
4657 return ERR_PTR(-EINVAL);
4658
4659 /*
4660 * Raw track based I/O needs IDAWs for each page,
4661 * and not just for 64 bit addresses.
4662 */
4663 cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
4664
4665 /*
4666 * struct PFX_eckd_data and struct LRE_eckd_data can have up to 2 bytes
4667 * of extended parameter. This is needed for write full track.
4668 */
4669 base_priv = basedev->private;
4670 use_prefix = base_priv->features.feature[8] & 0x01;
4671 if (use_prefix) {
4672 cplength = 1 + trkcount;
4673 size = sizeof(struct PFX_eckd_data) + 2;
4674 } else {
4675 cplength = 2 + trkcount;
4676 size = sizeof(struct DE_eckd_data) +
4677 sizeof(struct LRE_eckd_data) + 2;
4678 }
4679 size = ALIGN(size, 8);
4680
4681 datasize = size + cidaw * sizeof(unsigned long);
4682
4683 /* Allocate the ccw request. */
4684 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
4685 datasize, startdev, blk_mq_rq_to_pdu(req));
4686 if (IS_ERR(cqr))
4687 return cqr;
4688
4689 ccw = cqr->cpaddr;
4690 data = cqr->data;
4691
4692 if (use_prefix) {
4693 prefix_LRE(ccw++, data, first_trk, last_trk, cmd, basedev,
4694 startdev, 1, first_offs + 1, trkcount, 0, 0);
4695 } else {
4696 define_extent(ccw++, data, first_trk, last_trk, cmd, basedev, 0);
4697 ccw[-1].flags |= CCW_FLAG_CC;
4698
4699 data += sizeof(struct DE_eckd_data);
4700 locate_record_ext(ccw++, data, first_trk, first_offs + 1,
4701 trkcount, cmd, basedev, 0, 0);
4702 }
4703
4704 idaws = (unsigned long *)(cqr->data + size);
4705 len_to_track_end = 0;
4706 if (start_padding_sectors) {
4707 ccw[-1].flags |= CCW_FLAG_CC;
4708 ccw->cmd_code = cmd;
4709 /* maximum 3390 track size */
4710 ccw->count = 57326;
4711 /* 64k map to one track */
4712 len_to_track_end = 65536 - start_padding_sectors * 512;
4713 ccw->cda = (__u32)(addr_t)idaws;
4714 ccw->flags |= CCW_FLAG_IDA;
4715 ccw->flags |= CCW_FLAG_SLI;
4716 ccw++;
4717 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
4718 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
4719 }
4720 rq_for_each_segment(bv, req, iter) {
4721 dst = page_address(bv.bv_page) + bv.bv_offset;
4722 seg_len = bv.bv_len;
4723 if (cmd == DASD_ECKD_CCW_READ_TRACK)
4724 memset(dst, 0, seg_len);
4725 if (!len_to_track_end) {
4726 ccw[-1].flags |= CCW_FLAG_CC;
4727 ccw->cmd_code = cmd;
4728 /* maximum 3390 track size */
4729 ccw->count = 57326;
4730 /* 64k map to one track */
4731 len_to_track_end = 65536;
4732 ccw->cda = (__u32)(addr_t)idaws;
4733 ccw->flags |= CCW_FLAG_IDA;
4734 ccw->flags |= CCW_FLAG_SLI;
4735 ccw++;
4736 }
4737 len_to_track_end -= seg_len;
4738 idaws = idal_create_words(idaws, dst, seg_len);
4739 }
4740 for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
4741 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
4742 if (blk_noretry_request(req) ||
4743 block->base->features & DASD_FEATURE_FAILFAST)
4744 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4745 cqr->startdev = startdev;
4746 cqr->memdev = startdev;
4747 cqr->block = block;
4748 cqr->expires = startdev->default_expires * HZ;
4749 cqr->lpm = dasd_path_get_ppm(startdev);
4750 cqr->retries = startdev->default_retries;
4751 cqr->buildclk = get_tod_clock();
4752 cqr->status = DASD_CQR_FILLED;
4753
4754 return cqr;
4755 }
4756
4757
4758 static int
4759 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
4760 {
4761 struct dasd_eckd_private *private;
4762 struct ccw1 *ccw;
4763 struct req_iterator iter;
4764 struct bio_vec bv;
4765 char *dst, *cda;
4766 unsigned int blksize, blk_per_trk, off;
4767 sector_t recid;
4768 int status;
4769
4770 if (!dasd_page_cache)
4771 goto out;
4772 private = cqr->block->base->private;
4773 blksize = cqr->block->bp_block;
4774 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
4775 recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
4776 ccw = cqr->cpaddr;
4777 /* Skip over define extent & locate record. */
4778 ccw++;
4779 if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
4780 ccw++;
4781 rq_for_each_segment(bv, req, iter) {
4782 dst = page_address(bv.bv_page) + bv.bv_offset;
4783 for (off = 0; off < bv.bv_len; off += blksize) {
4784 /* Skip locate record. */
4785 if (private->uses_cdl && recid <= 2*blk_per_trk)
4786 ccw++;
4787 if (dst) {
4788 if (ccw->flags & CCW_FLAG_IDA)
4789 cda = *((char **)((addr_t) ccw->cda));
4790 else
4791 cda = (char *)((addr_t) ccw->cda);
4792 if (dst != cda) {
4793 if (rq_data_dir(req) == READ)
4794 memcpy(dst, cda, bv.bv_len);
4795 kmem_cache_free(dasd_page_cache,
4796 (void *)((addr_t)cda & PAGE_MASK));
4797 }
4798 dst = NULL;
4799 }
4800 ccw++;
4801 recid++;
4802 }
4803 }
4804 out:
4805 status = cqr->status == DASD_CQR_DONE;
4806 dasd_sfree_request(cqr, cqr->memdev);
4807 return status;
4808 }
4809
4810 /*
4811 * Modify ccw/tcw in cqr so it can be started on a base device.
4812 *
4813 * Note that this is not enough to restart the cqr!
4814 * Either reset cqr->startdev as well (summary unit check handling)
4815 * or restart via separate cqr (as in ERP handling).
4816 */
4817 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
4818 {
4819 struct ccw1 *ccw;
4820 struct PFX_eckd_data *pfxdata;
4821 struct tcw *tcw;
4822 struct tccb *tccb;
4823 struct dcw *dcw;
4824
4825 if (cqr->cpmode == 1) {
4826 tcw = cqr->cpaddr;
4827 tccb = tcw_get_tccb(tcw);
4828 dcw = (struct dcw *)&tccb->tca[0];
4829 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
4830 pfxdata->validity.verify_base = 0;
4831 pfxdata->validity.hyper_pav = 0;
4832 } else {
4833 ccw = cqr->cpaddr;
4834 pfxdata = cqr->data;
4835 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
4836 pfxdata->validity.verify_base = 0;
4837 pfxdata->validity.hyper_pav = 0;
4838 }
4839 }
4840 }
4841
4842 #define DASD_ECKD_CHANQ_MAX_SIZE 4
4843
4844 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
4845 struct dasd_block *block,
4846 struct request *req)
4847 {
4848 struct dasd_eckd_private *private;
4849 struct dasd_device *startdev;
4850 unsigned long flags;
4851 struct dasd_ccw_req *cqr;
4852
4853 startdev = dasd_alias_get_start_dev(base);
4854 if (!startdev)
4855 startdev = base;
4856 private = startdev->private;
4857 if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
4858 return ERR_PTR(-EBUSY);
4859
4860 spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
4861 private->count++;
4862 if ((base->features & DASD_FEATURE_USERAW))
4863 cqr = dasd_eckd_build_cp_raw(startdev, block, req);
4864 else
4865 cqr = dasd_eckd_build_cp(startdev, block, req);
4866 if (IS_ERR(cqr))
4867 private->count--;
4868 spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
4869 return cqr;
4870 }
4871
4872 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
4873 struct request *req)
4874 {
4875 struct dasd_eckd_private *private;
4876 unsigned long flags;
4877
4878 spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
4879 private = cqr->memdev->private;
4880 private->count--;
4881 spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
4882 return dasd_eckd_free_cp(cqr, req);
4883 }
4884
4885 static int
4886 dasd_eckd_fill_info(struct dasd_device * device,
4887 struct dasd_information2_t * info)
4888 {
4889 struct dasd_eckd_private *private = device->private;
4890
4891 info->label_block = 2;
4892 info->FBA_layout = private->uses_cdl ? 0 : 1;
4893 info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
4894 info->characteristics_size = sizeof(private->rdc_data);
4895 memcpy(info->characteristics, &private->rdc_data,
4896 sizeof(private->rdc_data));
4897 info->confdata_size = min((unsigned long)private->conf_len,
4898 sizeof(info->configuration_data));
4899 memcpy(info->configuration_data, private->conf_data,
4900 info->confdata_size);
4901 return 0;
4902 }
4903
4904 /*
4905 * SECTION: ioctl functions for eckd devices.
4906 */
4907
4908 /*
4909 * Release device ioctl.
4910 * Buils a channel programm to releases a prior reserved
4911 * (see dasd_eckd_reserve) device.
4912 */
4913 static int
4914 dasd_eckd_release(struct dasd_device *device)
4915 {
4916 struct dasd_ccw_req *cqr;
4917 int rc;
4918 struct ccw1 *ccw;
4919 int useglobal;
4920
4921 if (!capable(CAP_SYS_ADMIN))
4922 return -EACCES;
4923
4924 useglobal = 0;
4925 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
4926 if (IS_ERR(cqr)) {
4927 mutex_lock(&dasd_reserve_mutex);
4928 useglobal = 1;
4929 cqr = &dasd_reserve_req->cqr;
4930 memset(cqr, 0, sizeof(*cqr));
4931 memset(&dasd_reserve_req->ccw, 0,
4932 sizeof(dasd_reserve_req->ccw));
4933 cqr->cpaddr = &dasd_reserve_req->ccw;
4934 cqr->data = &dasd_reserve_req->data;
4935 cqr->magic = DASD_ECKD_MAGIC;
4936 }
4937 ccw = cqr->cpaddr;
4938 ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
4939 ccw->flags |= CCW_FLAG_SLI;
4940 ccw->count = 32;
4941 ccw->cda = (__u32)(addr_t) cqr->data;
4942 cqr->startdev = device;
4943 cqr->memdev = device;
4944 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4945 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4946 cqr->retries = 2; /* set retry counter to enable basic ERP */
4947 cqr->expires = 2 * HZ;
4948 cqr->buildclk = get_tod_clock();
4949 cqr->status = DASD_CQR_FILLED;
4950
4951 rc = dasd_sleep_on_immediatly(cqr);
4952 if (!rc)
4953 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4954
4955 if (useglobal)
4956 mutex_unlock(&dasd_reserve_mutex);
4957 else
4958 dasd_sfree_request(cqr, cqr->memdev);
4959 return rc;
4960 }
4961
4962 /*
4963 * Reserve device ioctl.
4964 * Options are set to 'synchronous wait for interrupt' and
4965 * 'timeout the request'. This leads to a terminate IO if
4966 * the interrupt is outstanding for a certain time.
4967 */
4968 static int
4969 dasd_eckd_reserve(struct dasd_device *device)
4970 {
4971 struct dasd_ccw_req *cqr;
4972 int rc;
4973 struct ccw1 *ccw;
4974 int useglobal;
4975
4976 if (!capable(CAP_SYS_ADMIN))
4977 return -EACCES;
4978
4979 useglobal = 0;
4980 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
4981 if (IS_ERR(cqr)) {
4982 mutex_lock(&dasd_reserve_mutex);
4983 useglobal = 1;
4984 cqr = &dasd_reserve_req->cqr;
4985 memset(cqr, 0, sizeof(*cqr));
4986 memset(&dasd_reserve_req->ccw, 0,
4987 sizeof(dasd_reserve_req->ccw));
4988 cqr->cpaddr = &dasd_reserve_req->ccw;
4989 cqr->data = &dasd_reserve_req->data;
4990 cqr->magic = DASD_ECKD_MAGIC;
4991 }
4992 ccw = cqr->cpaddr;
4993 ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
4994 ccw->flags |= CCW_FLAG_SLI;
4995 ccw->count = 32;
4996 ccw->cda = (__u32)(addr_t) cqr->data;
4997 cqr->startdev = device;
4998 cqr->memdev = device;
4999 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5000 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5001 cqr->retries = 2; /* set retry counter to enable basic ERP */
5002 cqr->expires = 2 * HZ;
5003 cqr->buildclk = get_tod_clock();
5004 cqr->status = DASD_CQR_FILLED;
5005
5006 rc = dasd_sleep_on_immediatly(cqr);
5007 if (!rc)
5008 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5009
5010 if (useglobal)
5011 mutex_unlock(&dasd_reserve_mutex);
5012 else
5013 dasd_sfree_request(cqr, cqr->memdev);
5014 return rc;
5015 }
5016
5017 /*
5018 * Steal lock ioctl - unconditional reserve device.
5019 * Buils a channel programm to break a device's reservation.
5020 * (unconditional reserve)
5021 */
5022 static int
5023 dasd_eckd_steal_lock(struct dasd_device *device)
5024 {
5025 struct dasd_ccw_req *cqr;
5026 int rc;
5027 struct ccw1 *ccw;
5028 int useglobal;
5029
5030 if (!capable(CAP_SYS_ADMIN))
5031 return -EACCES;
5032
5033 useglobal = 0;
5034 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
5035 if (IS_ERR(cqr)) {
5036 mutex_lock(&dasd_reserve_mutex);
5037 useglobal = 1;
5038 cqr = &dasd_reserve_req->cqr;
5039 memset(cqr, 0, sizeof(*cqr));
5040 memset(&dasd_reserve_req->ccw, 0,
5041 sizeof(dasd_reserve_req->ccw));
5042 cqr->cpaddr = &dasd_reserve_req->ccw;
5043 cqr->data = &dasd_reserve_req->data;
5044 cqr->magic = DASD_ECKD_MAGIC;
5045 }
5046 ccw = cqr->cpaddr;
5047 ccw->cmd_code = DASD_ECKD_CCW_SLCK;
5048 ccw->flags |= CCW_FLAG_SLI;
5049 ccw->count = 32;
5050 ccw->cda = (__u32)(addr_t) cqr->data;
5051 cqr->startdev = device;
5052 cqr->memdev = device;
5053 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5054 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5055 cqr->retries = 2; /* set retry counter to enable basic ERP */
5056 cqr->expires = 2 * HZ;
5057 cqr->buildclk = get_tod_clock();
5058 cqr->status = DASD_CQR_FILLED;
5059
5060 rc = dasd_sleep_on_immediatly(cqr);
5061 if (!rc)
5062 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
5063
5064 if (useglobal)
5065 mutex_unlock(&dasd_reserve_mutex);
5066 else
5067 dasd_sfree_request(cqr, cqr->memdev);
5068 return rc;
5069 }
5070
5071 /*
5072 * SNID - Sense Path Group ID
5073 * This ioctl may be used in situations where I/O is stalled due to
5074 * a reserve, so if the normal dasd_smalloc_request fails, we use the
5075 * preallocated dasd_reserve_req.
5076 */
5077 static int dasd_eckd_snid(struct dasd_device *device,
5078 void __user *argp)
5079 {
5080 struct dasd_ccw_req *cqr;
5081 int rc;
5082 struct ccw1 *ccw;
5083 int useglobal;
5084 struct dasd_snid_ioctl_data usrparm;
5085
5086 if (!capable(CAP_SYS_ADMIN))
5087 return -EACCES;
5088
5089 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
5090 return -EFAULT;
5091
5092 useglobal = 0;
5093 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
5094 sizeof(struct dasd_snid_data), device,
5095 NULL);
5096 if (IS_ERR(cqr)) {
5097 mutex_lock(&dasd_reserve_mutex);
5098 useglobal = 1;
5099 cqr = &dasd_reserve_req->cqr;
5100 memset(cqr, 0, sizeof(*cqr));
5101 memset(&dasd_reserve_req->ccw, 0,
5102 sizeof(dasd_reserve_req->ccw));
5103 cqr->cpaddr = &dasd_reserve_req->ccw;
5104 cqr->data = &dasd_reserve_req->data;
5105 cqr->magic = DASD_ECKD_MAGIC;
5106 }
5107 ccw = cqr->cpaddr;
5108 ccw->cmd_code = DASD_ECKD_CCW_SNID;
5109 ccw->flags |= CCW_FLAG_SLI;
5110 ccw->count = 12;
5111 ccw->cda = (__u32)(addr_t) cqr->data;
5112 cqr->startdev = device;
5113 cqr->memdev = device;
5114 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5115 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
5116 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
5117 cqr->retries = 5;
5118 cqr->expires = 10 * HZ;
5119 cqr->buildclk = get_tod_clock();
5120 cqr->status = DASD_CQR_FILLED;
5121 cqr->lpm = usrparm.path_mask;
5122
5123 rc = dasd_sleep_on_immediatly(cqr);
5124 /* verify that I/O processing didn't modify the path mask */
5125 if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
5126 rc = -EIO;
5127 if (!rc) {
5128 usrparm.data = *((struct dasd_snid_data *)cqr->data);
5129 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
5130 rc = -EFAULT;
5131 }
5132
5133 if (useglobal)
5134 mutex_unlock(&dasd_reserve_mutex);
5135 else
5136 dasd_sfree_request(cqr, cqr->memdev);
5137 return rc;
5138 }
5139
5140 /*
5141 * Read performance statistics
5142 */
5143 static int
5144 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
5145 {
5146 struct dasd_psf_prssd_data *prssdp;
5147 struct dasd_rssd_perf_stats_t *stats;
5148 struct dasd_ccw_req *cqr;
5149 struct ccw1 *ccw;
5150 int rc;
5151
5152 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5153 (sizeof(struct dasd_psf_prssd_data) +
5154 sizeof(struct dasd_rssd_perf_stats_t)),
5155 device, NULL);
5156 if (IS_ERR(cqr)) {
5157 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5158 "Could not allocate initialization request");
5159 return PTR_ERR(cqr);
5160 }
5161 cqr->startdev = device;
5162 cqr->memdev = device;
5163 cqr->retries = 0;
5164 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5165 cqr->expires = 10 * HZ;
5166
5167 /* Prepare for Read Subsystem Data */
5168 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5169 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5170 prssdp->order = PSF_ORDER_PRSSD;
5171 prssdp->suborder = 0x01; /* Performance Statistics */
5172 prssdp->varies[1] = 0x01; /* Perf Statistics for the Subsystem */
5173
5174 ccw = cqr->cpaddr;
5175 ccw->cmd_code = DASD_ECKD_CCW_PSF;
5176 ccw->count = sizeof(struct dasd_psf_prssd_data);
5177 ccw->flags |= CCW_FLAG_CC;
5178 ccw->cda = (__u32)(addr_t) prssdp;
5179
5180 /* Read Subsystem Data - Performance Statistics */
5181 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
5182 memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
5183
5184 ccw++;
5185 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5186 ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
5187 ccw->cda = (__u32)(addr_t) stats;
5188
5189 cqr->buildclk = get_tod_clock();
5190 cqr->status = DASD_CQR_FILLED;
5191 rc = dasd_sleep_on(cqr);
5192 if (rc == 0) {
5193 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5194 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
5195 if (copy_to_user(argp, stats,
5196 sizeof(struct dasd_rssd_perf_stats_t)))
5197 rc = -EFAULT;
5198 }
5199 dasd_sfree_request(cqr, cqr->memdev);
5200 return rc;
5201 }
5202
5203 /*
5204 * Get attributes (cache operations)
5205 * Returnes the cache attributes used in Define Extend (DE).
5206 */
5207 static int
5208 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
5209 {
5210 struct dasd_eckd_private *private = device->private;
5211 struct attrib_data_t attrib = private->attrib;
5212 int rc;
5213
5214 if (!capable(CAP_SYS_ADMIN))
5215 return -EACCES;
5216 if (!argp)
5217 return -EINVAL;
5218
5219 rc = 0;
5220 if (copy_to_user(argp, (long *) &attrib,
5221 sizeof(struct attrib_data_t)))
5222 rc = -EFAULT;
5223
5224 return rc;
5225 }
5226
5227 /*
5228 * Set attributes (cache operations)
5229 * Stores the attributes for cache operation to be used in Define Extend (DE).
5230 */
5231 static int
5232 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
5233 {
5234 struct dasd_eckd_private *private = device->private;
5235 struct attrib_data_t attrib;
5236
5237 if (!capable(CAP_SYS_ADMIN))
5238 return -EACCES;
5239 if (!argp)
5240 return -EINVAL;
5241
5242 if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
5243 return -EFAULT;
5244 private->attrib = attrib;
5245
5246 dev_info(&device->cdev->dev,
5247 "The DASD cache mode was set to %x (%i cylinder prestage)\n",
5248 private->attrib.operation, private->attrib.nr_cyl);
5249 return 0;
5250 }
5251
5252 /*
5253 * Issue syscall I/O to EMC Symmetrix array.
5254 * CCWs are PSF and RSSD
5255 */
5256 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
5257 {
5258 struct dasd_symmio_parms usrparm;
5259 char *psf_data, *rssd_result;
5260 struct dasd_ccw_req *cqr;
5261 struct ccw1 *ccw;
5262 char psf0, psf1;
5263 int rc;
5264
5265 if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
5266 return -EACCES;
5267 psf0 = psf1 = 0;
5268
5269 /* Copy parms from caller */
5270 rc = -EFAULT;
5271 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
5272 goto out;
5273 if (is_compat_task()) {
5274 /* Make sure pointers are sane even on 31 bit. */
5275 rc = -EINVAL;
5276 if ((usrparm.psf_data >> 32) != 0)
5277 goto out;
5278 if ((usrparm.rssd_result >> 32) != 0)
5279 goto out;
5280 usrparm.psf_data &= 0x7fffffffULL;
5281 usrparm.rssd_result &= 0x7fffffffULL;
5282 }
5283 /* at least 2 bytes are accessed and should be allocated */
5284 if (usrparm.psf_data_len < 2) {
5285 DBF_DEV_EVENT(DBF_WARNING, device,
5286 "Symmetrix ioctl invalid data length %d",
5287 usrparm.psf_data_len);
5288 rc = -EINVAL;
5289 goto out;
5290 }
5291 /* alloc I/O data area */
5292 psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
5293 rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
5294 if (!psf_data || !rssd_result) {
5295 rc = -ENOMEM;
5296 goto out_free;
5297 }
5298
5299 /* get syscall header from user space */
5300 rc = -EFAULT;
5301 if (copy_from_user(psf_data,
5302 (void __user *)(unsigned long) usrparm.psf_data,
5303 usrparm.psf_data_len))
5304 goto out_free;
5305 psf0 = psf_data[0];
5306 psf1 = psf_data[1];
5307
5308 /* setup CCWs for PSF + RSSD */
5309 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2, 0, device, NULL);
5310 if (IS_ERR(cqr)) {
5311 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5312 "Could not allocate initialization request");
5313 rc = PTR_ERR(cqr);
5314 goto out_free;
5315 }
5316
5317 cqr->startdev = device;
5318 cqr->memdev = device;
5319 cqr->retries = 3;
5320 cqr->expires = 10 * HZ;
5321 cqr->buildclk = get_tod_clock();
5322 cqr->status = DASD_CQR_FILLED;
5323
5324 /* Build the ccws */
5325 ccw = cqr->cpaddr;
5326
5327 /* PSF ccw */
5328 ccw->cmd_code = DASD_ECKD_CCW_PSF;
5329 ccw->count = usrparm.psf_data_len;
5330 ccw->flags |= CCW_FLAG_CC;
5331 ccw->cda = (__u32)(addr_t) psf_data;
5332
5333 ccw++;
5334
5335 /* RSSD ccw */
5336 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5337 ccw->count = usrparm.rssd_result_len;
5338 ccw->flags = CCW_FLAG_SLI ;
5339 ccw->cda = (__u32)(addr_t) rssd_result;
5340
5341 rc = dasd_sleep_on(cqr);
5342 if (rc)
5343 goto out_sfree;
5344
5345 rc = -EFAULT;
5346 if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
5347 rssd_result, usrparm.rssd_result_len))
5348 goto out_sfree;
5349 rc = 0;
5350
5351 out_sfree:
5352 dasd_sfree_request(cqr, cqr->memdev);
5353 out_free:
5354 kfree(rssd_result);
5355 kfree(psf_data);
5356 out:
5357 DBF_DEV_EVENT(DBF_WARNING, device,
5358 "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
5359 (int) psf0, (int) psf1, rc);
5360 return rc;
5361 }
5362
5363 static int
5364 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
5365 {
5366 struct dasd_device *device = block->base;
5367
5368 switch (cmd) {
5369 case BIODASDGATTR:
5370 return dasd_eckd_get_attrib(device, argp);
5371 case BIODASDSATTR:
5372 return dasd_eckd_set_attrib(device, argp);
5373 case BIODASDPSRD:
5374 return dasd_eckd_performance(device, argp);
5375 case BIODASDRLSE:
5376 return dasd_eckd_release(device);
5377 case BIODASDRSRV:
5378 return dasd_eckd_reserve(device);
5379 case BIODASDSLCK:
5380 return dasd_eckd_steal_lock(device);
5381 case BIODASDSNID:
5382 return dasd_eckd_snid(device, argp);
5383 case BIODASDSYMMIO:
5384 return dasd_symm_io(device, argp);
5385 default:
5386 return -ENOTTY;
5387 }
5388 }
5389
5390 /*
5391 * Dump the range of CCWs into 'page' buffer
5392 * and return number of printed chars.
5393 */
5394 static int
5395 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
5396 {
5397 int len, count;
5398 char *datap;
5399
5400 len = 0;
5401 while (from <= to) {
5402 len += sprintf(page + len, PRINTK_HEADER
5403 " CCW %p: %08X %08X DAT:",
5404 from, ((int *) from)[0], ((int *) from)[1]);
5405
5406 /* get pointer to data (consider IDALs) */
5407 if (from->flags & CCW_FLAG_IDA)
5408 datap = (char *) *((addr_t *) (addr_t) from->cda);
5409 else
5410 datap = (char *) ((addr_t) from->cda);
5411
5412 /* dump data (max 32 bytes) */
5413 for (count = 0; count < from->count && count < 32; count++) {
5414 if (count % 8 == 0) len += sprintf(page + len, " ");
5415 if (count % 4 == 0) len += sprintf(page + len, " ");
5416 len += sprintf(page + len, "%02x", datap[count]);
5417 }
5418 len += sprintf(page + len, "\n");
5419 from++;
5420 }
5421 return len;
5422 }
5423
5424 static void
5425 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
5426 char *reason)
5427 {
5428 u64 *sense;
5429 u64 *stat;
5430
5431 sense = (u64 *) dasd_get_sense(irb);
5432 stat = (u64 *) &irb->scsw;
5433 if (sense) {
5434 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
5435 "%016llx %016llx %016llx %016llx",
5436 reason, *stat, *((u32 *) (stat + 1)),
5437 sense[0], sense[1], sense[2], sense[3]);
5438 } else {
5439 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
5440 reason, *stat, *((u32 *) (stat + 1)),
5441 "NO VALID SENSE");
5442 }
5443 }
5444
5445 /*
5446 * Print sense data and related channel program.
5447 * Parts are printed because printk buffer is only 1024 bytes.
5448 */
5449 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
5450 struct dasd_ccw_req *req, struct irb *irb)
5451 {
5452 char *page;
5453 struct ccw1 *first, *last, *fail, *from, *to;
5454 int len, sl, sct;
5455
5456 page = (char *) get_zeroed_page(GFP_ATOMIC);
5457 if (page == NULL) {
5458 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5459 "No memory to dump sense data\n");
5460 return;
5461 }
5462 /* dump the sense data */
5463 len = sprintf(page, PRINTK_HEADER
5464 " I/O status report for device %s:\n",
5465 dev_name(&device->cdev->dev));
5466 len += sprintf(page + len, PRINTK_HEADER
5467 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
5468 "CS:%02X RC:%d\n",
5469 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
5470 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
5471 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
5472 req ? req->intrc : 0);
5473 len += sprintf(page + len, PRINTK_HEADER
5474 " device %s: Failing CCW: %p\n",
5475 dev_name(&device->cdev->dev),
5476 (void *) (addr_t) irb->scsw.cmd.cpa);
5477 if (irb->esw.esw0.erw.cons) {
5478 for (sl = 0; sl < 4; sl++) {
5479 len += sprintf(page + len, PRINTK_HEADER
5480 " Sense(hex) %2d-%2d:",
5481 (8 * sl), ((8 * sl) + 7));
5482
5483 for (sct = 0; sct < 8; sct++) {
5484 len += sprintf(page + len, " %02x",
5485 irb->ecw[8 * sl + sct]);
5486 }
5487 len += sprintf(page + len, "\n");
5488 }
5489
5490 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
5491 /* 24 Byte Sense Data */
5492 sprintf(page + len, PRINTK_HEADER
5493 " 24 Byte: %x MSG %x, "
5494 "%s MSGb to SYSOP\n",
5495 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
5496 irb->ecw[1] & 0x10 ? "" : "no");
5497 } else {
5498 /* 32 Byte Sense Data */
5499 sprintf(page + len, PRINTK_HEADER
5500 " 32 Byte: Format: %x "
5501 "Exception class %x\n",
5502 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
5503 }
5504 } else {
5505 sprintf(page + len, PRINTK_HEADER
5506 " SORRY - NO VALID SENSE AVAILABLE\n");
5507 }
5508 printk(KERN_ERR "%s", page);
5509
5510 if (req) {
5511 /* req == NULL for unsolicited interrupts */
5512 /* dump the Channel Program (max 140 Bytes per line) */
5513 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
5514 first = req->cpaddr;
5515 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
5516 to = min(first + 6, last);
5517 len = sprintf(page, PRINTK_HEADER
5518 " Related CP in req: %p\n", req);
5519 dasd_eckd_dump_ccw_range(first, to, page + len);
5520 printk(KERN_ERR "%s", page);
5521
5522 /* print failing CCW area (maximum 4) */
5523 /* scsw->cda is either valid or zero */
5524 len = 0;
5525 from = ++to;
5526 fail = (struct ccw1 *)(addr_t)
5527 irb->scsw.cmd.cpa; /* failing CCW */
5528 if (from < fail - 2) {
5529 from = fail - 2; /* there is a gap - print header */
5530 len += sprintf(page, PRINTK_HEADER "......\n");
5531 }
5532 to = min(fail + 1, last);
5533 len += dasd_eckd_dump_ccw_range(from, to, page + len);
5534
5535 /* print last CCWs (maximum 2) */
5536 from = max(from, ++to);
5537 if (from < last - 1) {
5538 from = last - 1; /* there is a gap - print header */
5539 len += sprintf(page + len, PRINTK_HEADER "......\n");
5540 }
5541 len += dasd_eckd_dump_ccw_range(from, last, page + len);
5542 if (len > 0)
5543 printk(KERN_ERR "%s", page);
5544 }
5545 free_page((unsigned long) page);
5546 }
5547
5548
5549 /*
5550 * Print sense data from a tcw.
5551 */
5552 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
5553 struct dasd_ccw_req *req, struct irb *irb)
5554 {
5555 char *page;
5556 int len, sl, sct, residual;
5557 struct tsb *tsb;
5558 u8 *sense, *rcq;
5559
5560 page = (char *) get_zeroed_page(GFP_ATOMIC);
5561 if (page == NULL) {
5562 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
5563 "No memory to dump sense data");
5564 return;
5565 }
5566 /* dump the sense data */
5567 len = sprintf(page, PRINTK_HEADER
5568 " I/O status report for device %s:\n",
5569 dev_name(&device->cdev->dev));
5570 len += sprintf(page + len, PRINTK_HEADER
5571 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
5572 "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
5573 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
5574 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
5575 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
5576 irb->scsw.tm.fcxs,
5577 (irb->scsw.tm.ifob << 7) | irb->scsw.tm.sesq,
5578 req ? req->intrc : 0);
5579 len += sprintf(page + len, PRINTK_HEADER
5580 " device %s: Failing TCW: %p\n",
5581 dev_name(&device->cdev->dev),
5582 (void *) (addr_t) irb->scsw.tm.tcw);
5583
5584 tsb = NULL;
5585 sense = NULL;
5586 if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
5587 tsb = tcw_get_tsb(
5588 (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
5589
5590 if (tsb) {
5591 len += sprintf(page + len, PRINTK_HEADER
5592 " tsb->length %d\n", tsb->length);
5593 len += sprintf(page + len, PRINTK_HEADER
5594 " tsb->flags %x\n", tsb->flags);
5595 len += sprintf(page + len, PRINTK_HEADER
5596 " tsb->dcw_offset %d\n", tsb->dcw_offset);
5597 len += sprintf(page + len, PRINTK_HEADER
5598 " tsb->count %d\n", tsb->count);
5599 residual = tsb->count - 28;
5600 len += sprintf(page + len, PRINTK_HEADER
5601 " residual %d\n", residual);
5602
5603 switch (tsb->flags & 0x07) {
5604 case 1: /* tsa_iostat */
5605 len += sprintf(page + len, PRINTK_HEADER
5606 " tsb->tsa.iostat.dev_time %d\n",
5607 tsb->tsa.iostat.dev_time);
5608 len += sprintf(page + len, PRINTK_HEADER
5609 " tsb->tsa.iostat.def_time %d\n",
5610 tsb->tsa.iostat.def_time);
5611 len += sprintf(page + len, PRINTK_HEADER
5612 " tsb->tsa.iostat.queue_time %d\n",
5613 tsb->tsa.iostat.queue_time);
5614 len += sprintf(page + len, PRINTK_HEADER
5615 " tsb->tsa.iostat.dev_busy_time %d\n",
5616 tsb->tsa.iostat.dev_busy_time);
5617 len += sprintf(page + len, PRINTK_HEADER
5618 " tsb->tsa.iostat.dev_act_time %d\n",
5619 tsb->tsa.iostat.dev_act_time);
5620 sense = tsb->tsa.iostat.sense;
5621 break;
5622 case 2: /* ts_ddpc */
5623 len += sprintf(page + len, PRINTK_HEADER
5624 " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
5625 for (sl = 0; sl < 2; sl++) {
5626 len += sprintf(page + len, PRINTK_HEADER
5627 " tsb->tsa.ddpc.rcq %2d-%2d: ",
5628 (8 * sl), ((8 * sl) + 7));
5629 rcq = tsb->tsa.ddpc.rcq;
5630 for (sct = 0; sct < 8; sct++) {
5631 len += sprintf(page + len, " %02x",
5632 rcq[8 * sl + sct]);
5633 }
5634 len += sprintf(page + len, "\n");
5635 }
5636 sense = tsb->tsa.ddpc.sense;
5637 break;
5638 case 3: /* tsa_intrg */
5639 len += sprintf(page + len, PRINTK_HEADER
5640 " tsb->tsa.intrg.: not supported yet\n");
5641 break;
5642 }
5643
5644 if (sense) {
5645 for (sl = 0; sl < 4; sl++) {
5646 len += sprintf(page + len, PRINTK_HEADER
5647 " Sense(hex) %2d-%2d:",
5648 (8 * sl), ((8 * sl) + 7));
5649 for (sct = 0; sct < 8; sct++) {
5650 len += sprintf(page + len, " %02x",
5651 sense[8 * sl + sct]);
5652 }
5653 len += sprintf(page + len, "\n");
5654 }
5655
5656 if (sense[27] & DASD_SENSE_BIT_0) {
5657 /* 24 Byte Sense Data */
5658 sprintf(page + len, PRINTK_HEADER
5659 " 24 Byte: %x MSG %x, "
5660 "%s MSGb to SYSOP\n",
5661 sense[7] >> 4, sense[7] & 0x0f,
5662 sense[1] & 0x10 ? "" : "no");
5663 } else {
5664 /* 32 Byte Sense Data */
5665 sprintf(page + len, PRINTK_HEADER
5666 " 32 Byte: Format: %x "
5667 "Exception class %x\n",
5668 sense[6] & 0x0f, sense[22] >> 4);
5669 }
5670 } else {
5671 sprintf(page + len, PRINTK_HEADER
5672 " SORRY - NO VALID SENSE AVAILABLE\n");
5673 }
5674 } else {
5675 sprintf(page + len, PRINTK_HEADER
5676 " SORRY - NO TSB DATA AVAILABLE\n");
5677 }
5678 printk(KERN_ERR "%s", page);
5679 free_page((unsigned long) page);
5680 }
5681
5682 static void dasd_eckd_dump_sense(struct dasd_device *device,
5683 struct dasd_ccw_req *req, struct irb *irb)
5684 {
5685 u8 *sense = dasd_get_sense(irb);
5686
5687 if (scsw_is_tm(&irb->scsw)) {
5688 /*
5689 * In some cases the 'File Protected' or 'Incorrect Length'
5690 * error might be expected and log messages shouldn't be written
5691 * then. Check if the according suppress bit is set.
5692 */
5693 if (sense && (sense[1] & SNS1_FILE_PROTECTED) &&
5694 test_bit(DASD_CQR_SUPPRESS_FP, &req->flags))
5695 return;
5696 if (scsw_cstat(&irb->scsw) == 0x40 &&
5697 test_bit(DASD_CQR_SUPPRESS_IL, &req->flags))
5698 return;
5699
5700 dasd_eckd_dump_sense_tcw(device, req, irb);
5701 } else {
5702 /*
5703 * In some cases the 'Command Reject' or 'No Record Found'
5704 * error might be expected and log messages shouldn't be
5705 * written then. Check if the according suppress bit is set.
5706 */
5707 if (sense && sense[0] & SNS0_CMD_REJECT &&
5708 test_bit(DASD_CQR_SUPPRESS_CR, &req->flags))
5709 return;
5710
5711 if (sense && sense[1] & SNS1_NO_REC_FOUND &&
5712 test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags))
5713 return;
5714
5715 dasd_eckd_dump_sense_ccw(device, req, irb);
5716 }
5717 }
5718
5719 static int dasd_eckd_reload_device(struct dasd_device *device)
5720 {
5721 struct dasd_eckd_private *private = device->private;
5722 int rc, old_base;
5723 char print_uid[60];
5724 struct dasd_uid uid;
5725 unsigned long flags;
5726
5727 /*
5728 * remove device from alias handling to prevent new requests
5729 * from being scheduled on the wrong alias device
5730 */
5731 dasd_alias_remove_device(device);
5732
5733 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
5734 old_base = private->uid.base_unit_addr;
5735 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
5736
5737 /* Read Configuration Data */
5738 rc = dasd_eckd_read_conf(device);
5739 if (rc)
5740 goto out_err;
5741
5742 rc = dasd_eckd_generate_uid(device);
5743 if (rc)
5744 goto out_err;
5745 /*
5746 * update unit address configuration and
5747 * add device to alias management
5748 */
5749 dasd_alias_update_add_device(device);
5750
5751 dasd_eckd_get_uid(device, &uid);
5752
5753 if (old_base != uid.base_unit_addr) {
5754 if (strlen(uid.vduit) > 0)
5755 snprintf(print_uid, sizeof(print_uid),
5756 "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
5757 uid.ssid, uid.base_unit_addr, uid.vduit);
5758 else
5759 snprintf(print_uid, sizeof(print_uid),
5760 "%s.%s.%04x.%02x", uid.vendor, uid.serial,
5761 uid.ssid, uid.base_unit_addr);
5762
5763 dev_info(&device->cdev->dev,
5764 "An Alias device was reassigned to a new base device "
5765 "with UID: %s\n", print_uid);
5766 }
5767 return 0;
5768
5769 out_err:
5770 return -1;
5771 }
5772
5773 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
5774 struct dasd_rssd_messages *messages,
5775 __u8 lpum)
5776 {
5777 struct dasd_rssd_messages *message_buf;
5778 struct dasd_psf_prssd_data *prssdp;
5779 struct dasd_ccw_req *cqr;
5780 struct ccw1 *ccw;
5781 int rc;
5782
5783 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5784 (sizeof(struct dasd_psf_prssd_data) +
5785 sizeof(struct dasd_rssd_messages)),
5786 device, NULL);
5787 if (IS_ERR(cqr)) {
5788 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5789 "Could not allocate read message buffer request");
5790 return PTR_ERR(cqr);
5791 }
5792
5793 cqr->lpm = lpum;
5794 retry:
5795 cqr->startdev = device;
5796 cqr->memdev = device;
5797 cqr->block = NULL;
5798 cqr->expires = 10 * HZ;
5799 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5800 /* dasd_sleep_on_immediatly does not do complex error
5801 * recovery so clear erp flag and set retry counter to
5802 * do basic erp */
5803 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5804 cqr->retries = 256;
5805
5806 /* Prepare for Read Subsystem Data */
5807 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5808 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5809 prssdp->order = PSF_ORDER_PRSSD;
5810 prssdp->suborder = 0x03; /* Message Buffer */
5811 /* all other bytes of prssdp must be zero */
5812
5813 ccw = cqr->cpaddr;
5814 ccw->cmd_code = DASD_ECKD_CCW_PSF;
5815 ccw->count = sizeof(struct dasd_psf_prssd_data);
5816 ccw->flags |= CCW_FLAG_CC;
5817 ccw->flags |= CCW_FLAG_SLI;
5818 ccw->cda = (__u32)(addr_t) prssdp;
5819
5820 /* Read Subsystem Data - message buffer */
5821 message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
5822 memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
5823
5824 ccw++;
5825 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5826 ccw->count = sizeof(struct dasd_rssd_messages);
5827 ccw->flags |= CCW_FLAG_SLI;
5828 ccw->cda = (__u32)(addr_t) message_buf;
5829
5830 cqr->buildclk = get_tod_clock();
5831 cqr->status = DASD_CQR_FILLED;
5832 rc = dasd_sleep_on_immediatly(cqr);
5833 if (rc == 0) {
5834 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5835 message_buf = (struct dasd_rssd_messages *)
5836 (prssdp + 1);
5837 memcpy(messages, message_buf,
5838 sizeof(struct dasd_rssd_messages));
5839 } else if (cqr->lpm) {
5840 /*
5841 * on z/VM we might not be able to do I/O on the requested path
5842 * but instead we get the required information on any path
5843 * so retry with open path mask
5844 */
5845 cqr->lpm = 0;
5846 goto retry;
5847 } else
5848 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5849 "Reading messages failed with rc=%d\n"
5850 , rc);
5851 dasd_sfree_request(cqr, cqr->memdev);
5852 return rc;
5853 }
5854
5855 static int dasd_eckd_query_host_access(struct dasd_device *device,
5856 struct dasd_psf_query_host_access *data)
5857 {
5858 struct dasd_eckd_private *private = device->private;
5859 struct dasd_psf_query_host_access *host_access;
5860 struct dasd_psf_prssd_data *prssdp;
5861 struct dasd_ccw_req *cqr;
5862 struct ccw1 *ccw;
5863 int rc;
5864
5865 /* not available for HYPER PAV alias devices */
5866 if (!device->block && private->lcu->pav == HYPER_PAV)
5867 return -EOPNOTSUPP;
5868
5869 /* may not be supported by the storage server */
5870 if (!(private->features.feature[14] & 0x80))
5871 return -EOPNOTSUPP;
5872
5873 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5874 sizeof(struct dasd_psf_prssd_data) + 1,
5875 device, NULL);
5876 if (IS_ERR(cqr)) {
5877 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5878 "Could not allocate read message buffer request");
5879 return PTR_ERR(cqr);
5880 }
5881 host_access = kzalloc(sizeof(*host_access), GFP_KERNEL | GFP_DMA);
5882 if (!host_access) {
5883 dasd_sfree_request(cqr, device);
5884 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5885 "Could not allocate host_access buffer");
5886 return -ENOMEM;
5887 }
5888 cqr->startdev = device;
5889 cqr->memdev = device;
5890 cqr->block = NULL;
5891 cqr->retries = 256;
5892 cqr->expires = 10 * HZ;
5893
5894 /* Prepare for Read Subsystem Data */
5895 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5896 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5897 prssdp->order = PSF_ORDER_PRSSD;
5898 prssdp->suborder = PSF_SUBORDER_QHA; /* query host access */
5899 /* LSS and Volume that will be queried */
5900 prssdp->lss = private->ned->ID;
5901 prssdp->volume = private->ned->unit_addr;
5902 /* all other bytes of prssdp must be zero */
5903
5904 ccw = cqr->cpaddr;
5905 ccw->cmd_code = DASD_ECKD_CCW_PSF;
5906 ccw->count = sizeof(struct dasd_psf_prssd_data);
5907 ccw->flags |= CCW_FLAG_CC;
5908 ccw->flags |= CCW_FLAG_SLI;
5909 ccw->cda = (__u32)(addr_t) prssdp;
5910
5911 /* Read Subsystem Data - query host access */
5912 ccw++;
5913 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5914 ccw->count = sizeof(struct dasd_psf_query_host_access);
5915 ccw->flags |= CCW_FLAG_SLI;
5916 ccw->cda = (__u32)(addr_t) host_access;
5917
5918 cqr->buildclk = get_tod_clock();
5919 cqr->status = DASD_CQR_FILLED;
5920 /* the command might not be supported, suppress error message */
5921 __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
5922 rc = dasd_sleep_on_interruptible(cqr);
5923 if (rc == 0) {
5924 *data = *host_access;
5925 } else {
5926 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5927 "Reading host access data failed with rc=%d\n",
5928 rc);
5929 rc = -EOPNOTSUPP;
5930 }
5931
5932 dasd_sfree_request(cqr, cqr->memdev);
5933 kfree(host_access);
5934 return rc;
5935 }
5936 /*
5937 * return number of grouped devices
5938 */
5939 static int dasd_eckd_host_access_count(struct dasd_device *device)
5940 {
5941 struct dasd_psf_query_host_access *access;
5942 struct dasd_ckd_path_group_entry *entry;
5943 struct dasd_ckd_host_information *info;
5944 int count = 0;
5945 int rc, i;
5946
5947 access = kzalloc(sizeof(*access), GFP_NOIO);
5948 if (!access) {
5949 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5950 "Could not allocate access buffer");
5951 return -ENOMEM;
5952 }
5953 rc = dasd_eckd_query_host_access(device, access);
5954 if (rc) {
5955 kfree(access);
5956 return rc;
5957 }
5958
5959 info = (struct dasd_ckd_host_information *)
5960 access->host_access_information;
5961 for (i = 0; i < info->entry_count; i++) {
5962 entry = (struct dasd_ckd_path_group_entry *)
5963 (info->entry + i * info->entry_size);
5964 if (entry->status_flags & DASD_ECKD_PG_GROUPED)
5965 count++;
5966 }
5967
5968 kfree(access);
5969 return count;
5970 }
5971
5972 /*
5973 * write host access information to a sequential file
5974 */
5975 static int dasd_hosts_print(struct dasd_device *device, struct seq_file *m)
5976 {
5977 struct dasd_psf_query_host_access *access;
5978 struct dasd_ckd_path_group_entry *entry;
5979 struct dasd_ckd_host_information *info;
5980 char sysplex[9] = "";
5981 int rc, i;
5982
5983 access = kzalloc(sizeof(*access), GFP_NOIO);
5984 if (!access) {
5985 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5986 "Could not allocate access buffer");
5987 return -ENOMEM;
5988 }
5989 rc = dasd_eckd_query_host_access(device, access);
5990 if (rc) {
5991 kfree(access);
5992 return rc;
5993 }
5994
5995 info = (struct dasd_ckd_host_information *)
5996 access->host_access_information;
5997 for (i = 0; i < info->entry_count; i++) {
5998 entry = (struct dasd_ckd_path_group_entry *)
5999 (info->entry + i * info->entry_size);
6000 /* PGID */
6001 seq_printf(m, "pgid %*phN\n", 11, entry->pgid);
6002 /* FLAGS */
6003 seq_printf(m, "status_flags %02x\n", entry->status_flags);
6004 /* SYSPLEX NAME */
6005 memcpy(&sysplex, &entry->sysplex_name, sizeof(sysplex) - 1);
6006 EBCASC(sysplex, sizeof(sysplex));
6007 seq_printf(m, "sysplex_name %8s\n", sysplex);
6008 /* SUPPORTED CYLINDER */
6009 seq_printf(m, "supported_cylinder %d\n", entry->cylinder);
6010 /* TIMESTAMP */
6011 seq_printf(m, "timestamp %lu\n", (unsigned long)
6012 entry->timestamp);
6013 }
6014 kfree(access);
6015
6016 return 0;
6017 }
6018
6019 /*
6020 * Perform Subsystem Function - CUIR response
6021 */
6022 static int
6023 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
6024 __u32 message_id, __u8 lpum)
6025 {
6026 struct dasd_psf_cuir_response *psf_cuir;
6027 int pos = pathmask_to_pos(lpum);
6028 struct dasd_ccw_req *cqr;
6029 struct ccw1 *ccw;
6030 int rc;
6031
6032 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
6033 sizeof(struct dasd_psf_cuir_response),
6034 device, NULL);
6035
6036 if (IS_ERR(cqr)) {
6037 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6038 "Could not allocate PSF-CUIR request");
6039 return PTR_ERR(cqr);
6040 }
6041
6042 psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
6043 psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
6044 psf_cuir->cc = response;
6045 psf_cuir->chpid = device->path[pos].chpid;
6046 psf_cuir->message_id = message_id;
6047 psf_cuir->cssid = device->path[pos].cssid;
6048 psf_cuir->ssid = device->path[pos].ssid;
6049 ccw = cqr->cpaddr;
6050 ccw->cmd_code = DASD_ECKD_CCW_PSF;
6051 ccw->cda = (__u32)(addr_t)psf_cuir;
6052 ccw->flags = CCW_FLAG_SLI;
6053 ccw->count = sizeof(struct dasd_psf_cuir_response);
6054
6055 cqr->startdev = device;
6056 cqr->memdev = device;
6057 cqr->block = NULL;
6058 cqr->retries = 256;
6059 cqr->expires = 10*HZ;
6060 cqr->buildclk = get_tod_clock();
6061 cqr->status = DASD_CQR_FILLED;
6062 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
6063
6064 rc = dasd_sleep_on(cqr);
6065
6066 dasd_sfree_request(cqr, cqr->memdev);
6067 return rc;
6068 }
6069
6070 /*
6071 * return configuration data that is referenced by record selector
6072 * if a record selector is specified or per default return the
6073 * conf_data pointer for the path specified by lpum
6074 */
6075 static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
6076 __u8 lpum,
6077 struct dasd_cuir_message *cuir)
6078 {
6079 struct dasd_conf_data *conf_data;
6080 int path, pos;
6081
6082 if (cuir->record_selector == 0)
6083 goto out;
6084 for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
6085 conf_data = device->path[pos].conf_data;
6086 if (conf_data->gneq.record_selector ==
6087 cuir->record_selector)
6088 return conf_data;
6089 }
6090 out:
6091 return device->path[pathmask_to_pos(lpum)].conf_data;
6092 }
6093
6094 /*
6095 * This function determines the scope of a reconfiguration request by
6096 * analysing the path and device selection data provided in the CUIR request.
6097 * Returns a path mask containing CUIR affected paths for the give device.
6098 *
6099 * If the CUIR request does not contain the required information return the
6100 * path mask of the path the attention message for the CUIR request was reveived
6101 * on.
6102 */
6103 static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
6104 struct dasd_cuir_message *cuir)
6105 {
6106 struct dasd_conf_data *ref_conf_data;
6107 unsigned long bitmask = 0, mask = 0;
6108 struct dasd_conf_data *conf_data;
6109 unsigned int pos, path;
6110 char *ref_gneq, *gneq;
6111 char *ref_ned, *ned;
6112 int tbcpm = 0;
6113
6114 /* if CUIR request does not specify the scope use the path
6115 the attention message was presented on */
6116 if (!cuir->ned_map ||
6117 !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
6118 return lpum;
6119
6120 /* get reference conf data */
6121 ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
6122 /* reference ned is determined by ned_map field */
6123 pos = 8 - ffs(cuir->ned_map);
6124 ref_ned = (char *)&ref_conf_data->neds[pos];
6125 ref_gneq = (char *)&ref_conf_data->gneq;
6126 /* transfer 24 bit neq_map to mask */
6127 mask = cuir->neq_map[2];
6128 mask |= cuir->neq_map[1] << 8;
6129 mask |= cuir->neq_map[0] << 16;
6130
6131 for (path = 0; path < 8; path++) {
6132 /* initialise data per path */
6133 bitmask = mask;
6134 conf_data = device->path[path].conf_data;
6135 pos = 8 - ffs(cuir->ned_map);
6136 ned = (char *) &conf_data->neds[pos];
6137 /* compare reference ned and per path ned */
6138 if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
6139 continue;
6140 gneq = (char *)&conf_data->gneq;
6141 /* compare reference gneq and per_path gneq under
6142 24 bit mask where mask bit 0 equals byte 7 of
6143 the gneq and mask bit 24 equals byte 31 */
6144 while (bitmask) {
6145 pos = ffs(bitmask) - 1;
6146 if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
6147 != 0)
6148 break;
6149 clear_bit(pos, &bitmask);
6150 }
6151 if (bitmask)
6152 continue;
6153 /* device and path match the reference values
6154 add path to CUIR scope */
6155 tbcpm |= 0x80 >> path;
6156 }
6157 return tbcpm;
6158 }
6159
6160 static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
6161 unsigned long paths, int action)
6162 {
6163 int pos;
6164
6165 while (paths) {
6166 /* get position of bit in mask */
6167 pos = 8 - ffs(paths);
6168 /* get channel path descriptor from this position */
6169 if (action == CUIR_QUIESCE)
6170 pr_warn("Service on the storage server caused path %x.%02x to go offline",
6171 device->path[pos].cssid,
6172 device->path[pos].chpid);
6173 else if (action == CUIR_RESUME)
6174 pr_info("Path %x.%02x is back online after service on the storage server",
6175 device->path[pos].cssid,
6176 device->path[pos].chpid);
6177 clear_bit(7 - pos, &paths);
6178 }
6179 }
6180
6181 static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
6182 struct dasd_cuir_message *cuir)
6183 {
6184 unsigned long tbcpm;
6185
6186 tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
6187 /* nothing to do if path is not in use */
6188 if (!(dasd_path_get_opm(device) & tbcpm))
6189 return 0;
6190 if (!(dasd_path_get_opm(device) & ~tbcpm)) {
6191 /* no path would be left if the CUIR action is taken
6192 return error */
6193 return -EINVAL;
6194 }
6195 /* remove device from operational path mask */
6196 dasd_path_remove_opm(device, tbcpm);
6197 dasd_path_add_cuirpm(device, tbcpm);
6198 return tbcpm;
6199 }
6200
6201 /*
6202 * walk through all devices and build a path mask to quiesce them
6203 * return an error if the last path to a device would be removed
6204 *
6205 * if only part of the devices are quiesced and an error
6206 * occurs no onlining necessary, the storage server will
6207 * notify the already set offline devices again
6208 */
6209 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
6210 struct dasd_cuir_message *cuir)
6211 {
6212 struct dasd_eckd_private *private = device->private;
6213 struct alias_pav_group *pavgroup, *tempgroup;
6214 struct dasd_device *dev, *n;
6215 unsigned long paths = 0;
6216 unsigned long flags;
6217 int tbcpm;
6218
6219 /* active devices */
6220 list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
6221 alias_list) {
6222 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6223 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6224 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
6225 if (tbcpm < 0)
6226 goto out_err;
6227 paths |= tbcpm;
6228 }
6229 /* inactive devices */
6230 list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
6231 alias_list) {
6232 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6233 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6234 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
6235 if (tbcpm < 0)
6236 goto out_err;
6237 paths |= tbcpm;
6238 }
6239 /* devices in PAV groups */
6240 list_for_each_entry_safe(pavgroup, tempgroup,
6241 &private->lcu->grouplist, group) {
6242 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
6243 alias_list) {
6244 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6245 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6246 spin_unlock_irqrestore(
6247 get_ccwdev_lock(dev->cdev), flags);
6248 if (tbcpm < 0)
6249 goto out_err;
6250 paths |= tbcpm;
6251 }
6252 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
6253 alias_list) {
6254 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
6255 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
6256 spin_unlock_irqrestore(
6257 get_ccwdev_lock(dev->cdev), flags);
6258 if (tbcpm < 0)
6259 goto out_err;
6260 paths |= tbcpm;
6261 }
6262 }
6263 /* notify user about all paths affected by CUIR action */
6264 dasd_eckd_cuir_notify_user(device, paths, CUIR_QUIESCE);
6265 return 0;
6266 out_err:
6267 return tbcpm;
6268 }
6269
6270 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
6271 struct dasd_cuir_message *cuir)
6272 {
6273 struct dasd_eckd_private *private = device->private;
6274 struct alias_pav_group *pavgroup, *tempgroup;
6275 struct dasd_device *dev, *n;
6276 unsigned long paths = 0;
6277 int tbcpm;
6278
6279 /*
6280 * the path may have been added through a generic path event before
6281 * only trigger path verification if the path is not already in use
6282 */
6283 list_for_each_entry_safe(dev, n,
6284 &private->lcu->active_devices,
6285 alias_list) {
6286 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6287 paths |= tbcpm;
6288 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6289 dasd_path_add_tbvpm(dev, tbcpm);
6290 dasd_schedule_device_bh(dev);
6291 }
6292 }
6293 list_for_each_entry_safe(dev, n,
6294 &private->lcu->inactive_devices,
6295 alias_list) {
6296 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6297 paths |= tbcpm;
6298 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6299 dasd_path_add_tbvpm(dev, tbcpm);
6300 dasd_schedule_device_bh(dev);
6301 }
6302 }
6303 /* devices in PAV groups */
6304 list_for_each_entry_safe(pavgroup, tempgroup,
6305 &private->lcu->grouplist,
6306 group) {
6307 list_for_each_entry_safe(dev, n,
6308 &pavgroup->baselist,
6309 alias_list) {
6310 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6311 paths |= tbcpm;
6312 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6313 dasd_path_add_tbvpm(dev, tbcpm);
6314 dasd_schedule_device_bh(dev);
6315 }
6316 }
6317 list_for_each_entry_safe(dev, n,
6318 &pavgroup->aliaslist,
6319 alias_list) {
6320 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
6321 paths |= tbcpm;
6322 if (!(dasd_path_get_opm(dev) & tbcpm)) {
6323 dasd_path_add_tbvpm(dev, tbcpm);
6324 dasd_schedule_device_bh(dev);
6325 }
6326 }
6327 }
6328 /* notify user about all paths affected by CUIR action */
6329 dasd_eckd_cuir_notify_user(device, paths, CUIR_RESUME);
6330 return 0;
6331 }
6332
6333 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
6334 __u8 lpum)
6335 {
6336 struct dasd_cuir_message *cuir = messages;
6337 int response;
6338
6339 DBF_DEV_EVENT(DBF_WARNING, device,
6340 "CUIR request: %016llx %016llx %016llx %08x",
6341 ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
6342 ((u32 *)cuir)[3]);
6343
6344 if (cuir->code == CUIR_QUIESCE) {
6345 /* quiesce */
6346 if (dasd_eckd_cuir_quiesce(device, lpum, cuir))
6347 response = PSF_CUIR_LAST_PATH;
6348 else
6349 response = PSF_CUIR_COMPLETED;
6350 } else if (cuir->code == CUIR_RESUME) {
6351 /* resume */
6352 dasd_eckd_cuir_resume(device, lpum, cuir);
6353 response = PSF_CUIR_COMPLETED;
6354 } else
6355 response = PSF_CUIR_NOT_SUPPORTED;
6356
6357 dasd_eckd_psf_cuir_response(device, response,
6358 cuir->message_id, lpum);
6359 DBF_DEV_EVENT(DBF_WARNING, device,
6360 "CUIR response: %d on message ID %08x", response,
6361 cuir->message_id);
6362 /* to make sure there is no attention left schedule work again */
6363 device->discipline->check_attention(device, lpum);
6364 }
6365
6366 static void dasd_eckd_oos_resume(struct dasd_device *device)
6367 {
6368 struct dasd_eckd_private *private = device->private;
6369 struct alias_pav_group *pavgroup, *tempgroup;
6370 struct dasd_device *dev, *n;
6371 unsigned long flags;
6372
6373 spin_lock_irqsave(&private->lcu->lock, flags);
6374 list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
6375 alias_list) {
6376 if (dev->stopped & DASD_STOPPED_NOSPC)
6377 dasd_generic_space_avail(dev);
6378 }
6379 list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
6380 alias_list) {
6381 if (dev->stopped & DASD_STOPPED_NOSPC)
6382 dasd_generic_space_avail(dev);
6383 }
6384 /* devices in PAV groups */
6385 list_for_each_entry_safe(pavgroup, tempgroup,
6386 &private->lcu->grouplist,
6387 group) {
6388 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
6389 alias_list) {
6390 if (dev->stopped & DASD_STOPPED_NOSPC)
6391 dasd_generic_space_avail(dev);
6392 }
6393 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
6394 alias_list) {
6395 if (dev->stopped & DASD_STOPPED_NOSPC)
6396 dasd_generic_space_avail(dev);
6397 }
6398 }
6399 spin_unlock_irqrestore(&private->lcu->lock, flags);
6400 }
6401
6402 static void dasd_eckd_handle_oos(struct dasd_device *device, void *messages,
6403 __u8 lpum)
6404 {
6405 struct dasd_oos_message *oos = messages;
6406
6407 switch (oos->code) {
6408 case REPO_WARN:
6409 case POOL_WARN:
6410 dev_warn(&device->cdev->dev,
6411 "Extent pool usage has reached a critical value\n");
6412 dasd_eckd_oos_resume(device);
6413 break;
6414 case REPO_EXHAUST:
6415 case POOL_EXHAUST:
6416 dev_warn(&device->cdev->dev,
6417 "Extent pool is exhausted\n");
6418 break;
6419 case REPO_RELIEVE:
6420 case POOL_RELIEVE:
6421 dev_info(&device->cdev->dev,
6422 "Extent pool physical space constraint has been relieved\n");
6423 break;
6424 }
6425
6426 /* In any case, update related data */
6427 dasd_eckd_read_ext_pool_info(device);
6428
6429 /* to make sure there is no attention left schedule work again */
6430 device->discipline->check_attention(device, lpum);
6431 }
6432
6433 static void dasd_eckd_check_attention_work(struct work_struct *work)
6434 {
6435 struct check_attention_work_data *data;
6436 struct dasd_rssd_messages *messages;
6437 struct dasd_device *device;
6438 int rc;
6439
6440 data = container_of(work, struct check_attention_work_data, worker);
6441 device = data->device;
6442 messages = kzalloc(sizeof(*messages), GFP_KERNEL);
6443 if (!messages) {
6444 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6445 "Could not allocate attention message buffer");
6446 goto out;
6447 }
6448 rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
6449 if (rc)
6450 goto out;
6451
6452 if (messages->length == ATTENTION_LENGTH_CUIR &&
6453 messages->format == ATTENTION_FORMAT_CUIR)
6454 dasd_eckd_handle_cuir(device, messages, data->lpum);
6455 if (messages->length == ATTENTION_LENGTH_OOS &&
6456 messages->format == ATTENTION_FORMAT_OOS)
6457 dasd_eckd_handle_oos(device, messages, data->lpum);
6458
6459 out:
6460 dasd_put_device(device);
6461 kfree(messages);
6462 kfree(data);
6463 }
6464
6465 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
6466 {
6467 struct check_attention_work_data *data;
6468
6469 data = kzalloc(sizeof(*data), GFP_ATOMIC);
6470 if (!data)
6471 return -ENOMEM;
6472 INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
6473 dasd_get_device(device);
6474 data->device = device;
6475 data->lpum = lpum;
6476 schedule_work(&data->worker);
6477 return 0;
6478 }
6479
6480 static int dasd_eckd_disable_hpf_path(struct dasd_device *device, __u8 lpum)
6481 {
6482 if (~lpum & dasd_path_get_opm(device)) {
6483 dasd_path_add_nohpfpm(device, lpum);
6484 dasd_path_remove_opm(device, lpum);
6485 dev_err(&device->cdev->dev,
6486 "Channel path %02X lost HPF functionality and is disabled\n",
6487 lpum);
6488 return 1;
6489 }
6490 return 0;
6491 }
6492
6493 static void dasd_eckd_disable_hpf_device(struct dasd_device *device)
6494 {
6495 struct dasd_eckd_private *private = device->private;
6496
6497 dev_err(&device->cdev->dev,
6498 "High Performance FICON disabled\n");
6499 private->fcx_max_data = 0;
6500 }
6501
6502 static int dasd_eckd_hpf_enabled(struct dasd_device *device)
6503 {
6504 struct dasd_eckd_private *private = device->private;
6505
6506 return private->fcx_max_data ? 1 : 0;
6507 }
6508
6509 static void dasd_eckd_handle_hpf_error(struct dasd_device *device,
6510 struct irb *irb)
6511 {
6512 struct dasd_eckd_private *private = device->private;
6513
6514 if (!private->fcx_max_data) {
6515 /* sanity check for no HPF, the error makes no sense */
6516 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
6517 "Trying to disable HPF for a non HPF device");
6518 return;
6519 }
6520 if (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX) {
6521 dasd_eckd_disable_hpf_device(device);
6522 } else if (irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX) {
6523 if (dasd_eckd_disable_hpf_path(device, irb->esw.esw1.lpum))
6524 return;
6525 dasd_eckd_disable_hpf_device(device);
6526 dasd_path_set_tbvpm(device,
6527 dasd_path_get_hpfpm(device));
6528 }
6529 /*
6530 * prevent that any new I/O ist started on the device and schedule a
6531 * requeue of existing requests
6532 */
6533 dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC);
6534 dasd_schedule_requeue(device);
6535 }
6536
6537 /*
6538 * Initialize block layer request queue.
6539 */
6540 static void dasd_eckd_setup_blk_queue(struct dasd_block *block)
6541 {
6542 unsigned int logical_block_size = block->bp_block;
6543 struct request_queue *q = block->request_queue;
6544 struct dasd_device *device = block->base;
6545 int max;
6546
6547 if (device->features & DASD_FEATURE_USERAW) {
6548 /*
6549 * the max_blocks value for raw_track access is 256
6550 * it is higher than the native ECKD value because we
6551 * only need one ccw per track
6552 * so the max_hw_sectors are
6553 * 2048 x 512B = 1024kB = 16 tracks
6554 */
6555 max = DASD_ECKD_MAX_BLOCKS_RAW << block->s2b_shift;
6556 } else {
6557 max = DASD_ECKD_MAX_BLOCKS << block->s2b_shift;
6558 }
6559 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
6560 q->limits.max_dev_sectors = max;
6561 blk_queue_logical_block_size(q, logical_block_size);
6562 blk_queue_max_hw_sectors(q, max);
6563 blk_queue_max_segments(q, USHRT_MAX);
6564 /* With page sized segments each segment can be translated into one idaw/tidaw */
6565 blk_queue_max_segment_size(q, PAGE_SIZE);
6566 blk_queue_segment_boundary(q, PAGE_SIZE - 1);
6567 }
6568
6569 static struct ccw_driver dasd_eckd_driver = {
6570 .driver = {
6571 .name = "dasd-eckd",
6572 .owner = THIS_MODULE,
6573 },
6574 .ids = dasd_eckd_ids,
6575 .probe = dasd_eckd_probe,
6576 .remove = dasd_generic_remove,
6577 .set_offline = dasd_generic_set_offline,
6578 .set_online = dasd_eckd_set_online,
6579 .notify = dasd_generic_notify,
6580 .path_event = dasd_generic_path_event,
6581 .shutdown = dasd_generic_shutdown,
6582 .uc_handler = dasd_generic_uc_handler,
6583 .int_class = IRQIO_DAS,
6584 };
6585
6586 static struct dasd_discipline dasd_eckd_discipline = {
6587 .owner = THIS_MODULE,
6588 .name = "ECKD",
6589 .ebcname = "ECKD",
6590 .check_device = dasd_eckd_check_characteristics,
6591 .uncheck_device = dasd_eckd_uncheck_device,
6592 .do_analysis = dasd_eckd_do_analysis,
6593 .verify_path = dasd_eckd_verify_path,
6594 .basic_to_ready = dasd_eckd_basic_to_ready,
6595 .online_to_ready = dasd_eckd_online_to_ready,
6596 .basic_to_known = dasd_eckd_basic_to_known,
6597 .setup_blk_queue = dasd_eckd_setup_blk_queue,
6598 .fill_geometry = dasd_eckd_fill_geometry,
6599 .start_IO = dasd_start_IO,
6600 .term_IO = dasd_term_IO,
6601 .handle_terminated_request = dasd_eckd_handle_terminated_request,
6602 .format_device = dasd_eckd_format_device,
6603 .check_device_format = dasd_eckd_check_device_format,
6604 .erp_action = dasd_eckd_erp_action,
6605 .erp_postaction = dasd_eckd_erp_postaction,
6606 .check_for_device_change = dasd_eckd_check_for_device_change,
6607 .build_cp = dasd_eckd_build_alias_cp,
6608 .free_cp = dasd_eckd_free_alias_cp,
6609 .dump_sense = dasd_eckd_dump_sense,
6610 .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
6611 .fill_info = dasd_eckd_fill_info,
6612 .ioctl = dasd_eckd_ioctl,
6613 .reload = dasd_eckd_reload_device,
6614 .get_uid = dasd_eckd_get_uid,
6615 .kick_validate = dasd_eckd_kick_validate_server,
6616 .check_attention = dasd_eckd_check_attention,
6617 .host_access_count = dasd_eckd_host_access_count,
6618 .hosts_print = dasd_hosts_print,
6619 .handle_hpf_error = dasd_eckd_handle_hpf_error,
6620 .disable_hpf = dasd_eckd_disable_hpf_device,
6621 .hpf_enabled = dasd_eckd_hpf_enabled,
6622 .reset_path = dasd_eckd_reset_path,
6623 .is_ese = dasd_eckd_is_ese,
6624 .space_allocated = dasd_eckd_space_allocated,
6625 .space_configured = dasd_eckd_space_configured,
6626 .logical_capacity = dasd_eckd_logical_capacity,
6627 .release_space = dasd_eckd_release_space,
6628 .ext_pool_id = dasd_eckd_ext_pool_id,
6629 .ext_size = dasd_eckd_ext_size,
6630 .ext_pool_cap_at_warnlevel = dasd_eckd_ext_pool_cap_at_warnlevel,
6631 .ext_pool_warn_thrshld = dasd_eckd_ext_pool_warn_thrshld,
6632 .ext_pool_oos = dasd_eckd_ext_pool_oos,
6633 .ext_pool_exhaust = dasd_eckd_ext_pool_exhaust,
6634 .ese_format = dasd_eckd_ese_format,
6635 .ese_read = dasd_eckd_ese_read,
6636 };
6637
6638 static int __init
6639 dasd_eckd_init(void)
6640 {
6641 int ret;
6642
6643 ASCEBC(dasd_eckd_discipline.ebcname, 4);
6644 dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
6645 GFP_KERNEL | GFP_DMA);
6646 if (!dasd_reserve_req)
6647 return -ENOMEM;
6648 dasd_vol_info_req = kmalloc(sizeof(*dasd_vol_info_req),
6649 GFP_KERNEL | GFP_DMA);
6650 if (!dasd_vol_info_req)
6651 return -ENOMEM;
6652 path_verification_worker = kmalloc(sizeof(*path_verification_worker),
6653 GFP_KERNEL | GFP_DMA);
6654 if (!path_verification_worker) {
6655 kfree(dasd_reserve_req);
6656 kfree(dasd_vol_info_req);
6657 return -ENOMEM;
6658 }
6659 rawpadpage = (void *)__get_free_page(GFP_KERNEL);
6660 if (!rawpadpage) {
6661 kfree(path_verification_worker);
6662 kfree(dasd_reserve_req);
6663 kfree(dasd_vol_info_req);
6664 return -ENOMEM;
6665 }
6666 ret = ccw_driver_register(&dasd_eckd_driver);
6667 if (!ret)
6668 wait_for_device_probe();
6669 else {
6670 kfree(path_verification_worker);
6671 kfree(dasd_reserve_req);
6672 kfree(dasd_vol_info_req);
6673 free_page((unsigned long)rawpadpage);
6674 }
6675 return ret;
6676 }
6677
6678 static void __exit
6679 dasd_eckd_cleanup(void)
6680 {
6681 ccw_driver_unregister(&dasd_eckd_driver);
6682 kfree(path_verification_worker);
6683 kfree(dasd_reserve_req);
6684 free_page((unsigned long)rawpadpage);
6685 }
6686
6687 module_init(dasd_eckd_init);
6688 module_exit(dasd_eckd_cleanup);
Michael's Linux tree.