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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* ------------------------------------------------------------ |
3 | * ibmvscsi.c | |
4 | * (C) Copyright IBM Corporation 1994, 2004 | |
5 | * Authors: Colin DeVilbiss (devilbis@us.ibm.com) | |
6 | * Santiago Leon (santil@us.ibm.com) | |
7 | * Dave Boutcher (sleddog@us.ibm.com) | |
8 | * | |
1da177e4 LT |
9 | * ------------------------------------------------------------ |
10 | * Emulation of a SCSI host adapter for Virtual I/O devices | |
11 | * | |
12 | * This driver supports the SCSI adapter implemented by the IBM | |
13 | * Power5 firmware. That SCSI adapter is not a physical adapter, | |
14 | * but allows Linux SCSI peripheral drivers to directly | |
15 | * access devices in another logical partition on the physical system. | |
16 | * | |
17 | * The virtual adapter(s) are present in the open firmware device | |
18 | * tree just like real adapters. | |
19 | * | |
20 | * One of the capabilities provided on these systems is the ability | |
21 | * to DMA between partitions. The architecture states that for VSCSI, | |
22 | * the server side is allowed to DMA to and from the client. The client | |
23 | * is never trusted to DMA to or from the server directly. | |
24 | * | |
25 | * Messages are sent between partitions on a "Command/Response Queue" | |
26 | * (CRQ), which is just a buffer of 16 byte entries in the receiver's | |
27 | * Senders cannot access the buffer directly, but send messages by | |
28 | * making a hypervisor call and passing in the 16 bytes. The hypervisor | |
9b7dac08 | 29 | * puts the message in the next 16 byte space in round-robin fashion, |
1da177e4 LT |
30 | * turns on the high order bit of the message (the valid bit), and |
31 | * generates an interrupt to the receiver (if interrupts are turned on.) | |
32 | * The receiver just turns off the valid bit when they have copied out | |
33 | * the message. | |
34 | * | |
35 | * The VSCSI client builds a SCSI Remote Protocol (SRP) Information Unit | |
36 | * (IU) (as defined in the T10 standard available at www.t10.org), gets | |
37 | * a DMA address for the message, and sends it to the server as the | |
38 | * payload of a CRQ message. The server DMAs the SRP IU and processes it, | |
39 | * including doing any additional data transfers. When it is done, it | |
40 | * DMAs the SRP response back to the same address as the request came from, | |
41 | * and sends a CRQ message back to inform the client that the request has | |
42 | * completed. | |
43 | * | |
7834799a | 44 | * TODO: This is currently pretty tied to the IBM pSeries hypervisor |
1da177e4 LT |
45 | * interfaces. It would be really nice to abstract this above an RDMA |
46 | * layer. | |
47 | */ | |
48 | ||
49 | #include <linux/module.h> | |
50 | #include <linux/moduleparam.h> | |
51 | #include <linux/dma-mapping.h> | |
52 | #include <linux/delay.h> | |
5a0e3ad6 | 53 | #include <linux/slab.h> |
126c5cc3 | 54 | #include <linux/of.h> |
64355b92 | 55 | #include <linux/pm.h> |
0f33ece5 | 56 | #include <linux/kthread.h> |
d3849d51 | 57 | #include <asm/firmware.h> |
1da177e4 LT |
58 | #include <asm/vio.h> |
59 | #include <scsi/scsi.h> | |
60 | #include <scsi/scsi_cmnd.h> | |
61 | #include <scsi/scsi_host.h> | |
62 | #include <scsi/scsi_device.h> | |
4d680419 | 63 | #include <scsi/scsi_transport_srp.h> |
1da177e4 LT |
64 | #include "ibmvscsi.h" |
65 | ||
66 | /* The values below are somewhat arbitrary default values, but | |
67 | * OS/400 will use 3 busses (disks, CDs, tapes, I think.) | |
68 | * Note that there are 3 bits of channel value, 6 bits of id, and | |
69 | * 5 bits of LUN. | |
70 | */ | |
71 | static int max_id = 64; | |
72 | static int max_channel = 3; | |
e1a5ce5b RJ |
73 | static int init_timeout = 300; |
74 | static int login_timeout = 60; | |
75 | static int info_timeout = 30; | |
76 | static int abort_timeout = 60; | |
77 | static int reset_timeout = 60; | |
a897ff2a | 78 | static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT; |
4f10aae0 | 79 | static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2; |
c1988e31 | 80 | static int fast_fail = 1; |
126c5cc3 | 81 | static int client_reserve = 1; |
1262dc09 | 82 | static char partition_name[96] = "UNKNOWN"; |
9965c2f1 | 83 | static unsigned int partition_number = -1; |
32d6e4b6 | 84 | static LIST_HEAD(ibmvscsi_head); |
7205981e | 85 | static DEFINE_SPINLOCK(ibmvscsi_driver_lock); |
1da177e4 | 86 | |
4d680419 FT |
87 | static struct scsi_transport_template *ibmvscsi_transport_template; |
88 | ||
aac3118d | 89 | #define IBMVSCSI_VERSION "1.5.9" |
1da177e4 LT |
90 | |
91 | MODULE_DESCRIPTION("IBM Virtual SCSI"); | |
92 | MODULE_AUTHOR("Dave Boutcher"); | |
93 | MODULE_LICENSE("GPL"); | |
94 | MODULE_VERSION(IBMVSCSI_VERSION); | |
95 | ||
96 | module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR); | |
e3678a0c | 97 | MODULE_PARM_DESC(max_id, "Largest ID value for each channel [Default=64]"); |
1da177e4 | 98 | module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR); |
e3678a0c | 99 | MODULE_PARM_DESC(max_channel, "Largest channel value [Default=3]"); |
1da177e4 LT |
100 | module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR); |
101 | MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds"); | |
21465eda | 102 | module_param_named(max_requests, max_requests, int, S_IRUGO); |
1da177e4 | 103 | MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter"); |
c1988e31 RJ |
104 | module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR); |
105 | MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]"); | |
126c5cc3 BK |
106 | module_param_named(client_reserve, client_reserve, int, S_IRUGO ); |
107 | MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release"); | |
1da177e4 | 108 | |
9965c2f1 BH |
109 | static void ibmvscsi_handle_crq(struct viosrp_crq *crq, |
110 | struct ibmvscsi_host_data *hostdata); | |
111 | ||
112 | /* ------------------------------------------------------------ | |
113 | * Routines for managing the command/response queue | |
114 | */ | |
115 | /** | |
116 | * ibmvscsi_handle_event: - Interrupt handler for crq events | |
117 | * @irq: number of irq to handle, not used | |
118 | * @dev_instance: ibmvscsi_host_data of host that received interrupt | |
119 | * | |
120 | * Disables interrupts and schedules srp_task | |
121 | * Always returns IRQ_HANDLED | |
122 | */ | |
123 | static irqreturn_t ibmvscsi_handle_event(int irq, void *dev_instance) | |
124 | { | |
125 | struct ibmvscsi_host_data *hostdata = | |
126 | (struct ibmvscsi_host_data *)dev_instance; | |
127 | vio_disable_interrupts(to_vio_dev(hostdata->dev)); | |
128 | tasklet_schedule(&hostdata->srp_task); | |
129 | return IRQ_HANDLED; | |
130 | } | |
131 | ||
132 | /** | |
133 | * release_crq_queue: - Deallocates data and unregisters CRQ | |
134 | * @queue: crq_queue to initialize and register | |
135 | * @host_data: ibmvscsi_host_data of host | |
136 | * | |
137 | * Frees irq, deallocates a page for messages, unmaps dma, and unregisters | |
138 | * the crq with the hypervisor. | |
139 | */ | |
140 | static void ibmvscsi_release_crq_queue(struct crq_queue *queue, | |
141 | struct ibmvscsi_host_data *hostdata, | |
142 | int max_requests) | |
143 | { | |
144 | long rc = 0; | |
145 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
146 | free_irq(vdev->irq, (void *)hostdata); | |
147 | tasklet_kill(&hostdata->srp_task); | |
148 | do { | |
149 | if (rc) | |
150 | msleep(100); | |
151 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); | |
152 | } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); | |
153 | dma_unmap_single(hostdata->dev, | |
154 | queue->msg_token, | |
155 | queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); | |
156 | free_page((unsigned long)queue->msgs); | |
157 | } | |
158 | ||
159 | /** | |
160 | * crq_queue_next_crq: - Returns the next entry in message queue | |
161 | * @queue: crq_queue to use | |
162 | * | |
163 | * Returns pointer to next entry in queue, or NULL if there are no new | |
164 | * entried in the CRQ. | |
165 | */ | |
166 | static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue) | |
167 | { | |
168 | struct viosrp_crq *crq; | |
169 | unsigned long flags; | |
170 | ||
171 | spin_lock_irqsave(&queue->lock, flags); | |
172 | crq = &queue->msgs[queue->cur]; | |
55c9b1e5 | 173 | if (crq->valid != VIOSRP_CRQ_FREE) { |
9965c2f1 BH |
174 | if (++queue->cur == queue->size) |
175 | queue->cur = 0; | |
7114aae0 BK |
176 | |
177 | /* Ensure the read of the valid bit occurs before reading any | |
178 | * other bits of the CRQ entry | |
179 | */ | |
180 | rmb(); | |
9965c2f1 BH |
181 | } else |
182 | crq = NULL; | |
183 | spin_unlock_irqrestore(&queue->lock, flags); | |
184 | ||
185 | return crq; | |
186 | } | |
187 | ||
188 | /** | |
189 | * ibmvscsi_send_crq: - Send a CRQ | |
190 | * @hostdata: the adapter | |
191 | * @word1: the first 64 bits of the data | |
192 | * @word2: the second 64 bits of the data | |
193 | */ | |
194 | static int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, | |
195 | u64 word1, u64 word2) | |
196 | { | |
197 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
198 | ||
7114aae0 BK |
199 | /* |
200 | * Ensure the command buffer is flushed to memory before handing it | |
201 | * over to the VIOS to prevent it from fetching any stale data. | |
202 | */ | |
203 | mb(); | |
9965c2f1 BH |
204 | return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2); |
205 | } | |
206 | ||
207 | /** | |
208 | * ibmvscsi_task: - Process srps asynchronously | |
209 | * @data: ibmvscsi_host_data of host | |
210 | */ | |
211 | static void ibmvscsi_task(void *data) | |
212 | { | |
213 | struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data; | |
214 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
215 | struct viosrp_crq *crq; | |
216 | int done = 0; | |
217 | ||
218 | while (!done) { | |
219 | /* Pull all the valid messages off the CRQ */ | |
220 | while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) { | |
221 | ibmvscsi_handle_crq(crq, hostdata); | |
55c9b1e5 | 222 | crq->valid = VIOSRP_CRQ_FREE; |
b39205d2 | 223 | wmb(); |
9965c2f1 BH |
224 | } |
225 | ||
226 | vio_enable_interrupts(vdev); | |
227 | crq = crq_queue_next_crq(&hostdata->queue); | |
228 | if (crq != NULL) { | |
229 | vio_disable_interrupts(vdev); | |
230 | ibmvscsi_handle_crq(crq, hostdata); | |
55c9b1e5 | 231 | crq->valid = VIOSRP_CRQ_FREE; |
b39205d2 | 232 | wmb(); |
9965c2f1 BH |
233 | } else { |
234 | done = 1; | |
235 | } | |
236 | } | |
237 | } | |
238 | ||
239 | static void gather_partition_info(void) | |
240 | { | |
9965c2f1 | 241 | const char *ppartition_name; |
72264eb6 | 242 | const __be32 *p_number_ptr; |
9965c2f1 BH |
243 | |
244 | /* Retrieve information about this partition */ | |
5114d6a7 | 245 | if (!of_root) |
9965c2f1 | 246 | return; |
9965c2f1 | 247 | |
5114d6a7 TD |
248 | of_node_get(of_root); |
249 | ||
250 | ppartition_name = of_get_property(of_root, "ibm,partition-name", NULL); | |
9965c2f1 | 251 | if (ppartition_name) |
1262dc09 | 252 | strlcpy(partition_name, ppartition_name, |
9965c2f1 | 253 | sizeof(partition_name)); |
5114d6a7 | 254 | p_number_ptr = of_get_property(of_root, "ibm,partition-no", NULL); |
9965c2f1 | 255 | if (p_number_ptr) |
72264eb6 | 256 | partition_number = of_read_number(p_number_ptr, 1); |
5114d6a7 | 257 | of_node_put(of_root); |
9965c2f1 BH |
258 | } |
259 | ||
260 | static void set_adapter_info(struct ibmvscsi_host_data *hostdata) | |
261 | { | |
262 | memset(&hostdata->madapter_info, 0x00, | |
263 | sizeof(hostdata->madapter_info)); | |
264 | ||
265 | dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION); | |
266 | strcpy(hostdata->madapter_info.srp_version, SRP_VERSION); | |
267 | ||
268 | strncpy(hostdata->madapter_info.partition_name, partition_name, | |
269 | sizeof(hostdata->madapter_info.partition_name)); | |
270 | ||
72264eb6 AB |
271 | hostdata->madapter_info.partition_number = |
272 | cpu_to_be32(partition_number); | |
9965c2f1 | 273 | |
45d8c30f TD |
274 | hostdata->madapter_info.mad_version = cpu_to_be32(SRP_MAD_VERSION_1); |
275 | hostdata->madapter_info.os_type = cpu_to_be32(SRP_MAD_OS_LINUX); | |
9965c2f1 BH |
276 | } |
277 | ||
278 | /** | |
279 | * reset_crq_queue: - resets a crq after a failure | |
280 | * @queue: crq_queue to initialize and register | |
281 | * @hostdata: ibmvscsi_host_data of host | |
282 | * | |
283 | */ | |
284 | static int ibmvscsi_reset_crq_queue(struct crq_queue *queue, | |
285 | struct ibmvscsi_host_data *hostdata) | |
286 | { | |
287 | int rc = 0; | |
288 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
289 | ||
290 | /* Close the CRQ */ | |
291 | do { | |
292 | if (rc) | |
293 | msleep(100); | |
294 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); | |
295 | } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); | |
296 | ||
297 | /* Clean out the queue */ | |
298 | memset(queue->msgs, 0x00, PAGE_SIZE); | |
299 | queue->cur = 0; | |
300 | ||
301 | set_adapter_info(hostdata); | |
302 | ||
303 | /* And re-open it again */ | |
304 | rc = plpar_hcall_norets(H_REG_CRQ, | |
305 | vdev->unit_address, | |
306 | queue->msg_token, PAGE_SIZE); | |
06cdbeff | 307 | if (rc == H_CLOSED) { |
9965c2f1 BH |
308 | /* Adapter is good, but other end is not ready */ |
309 | dev_warn(hostdata->dev, "Partner adapter not ready\n"); | |
310 | } else if (rc != 0) { | |
311 | dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc); | |
312 | } | |
313 | return rc; | |
314 | } | |
315 | ||
316 | /** | |
317 | * initialize_crq_queue: - Initializes and registers CRQ with hypervisor | |
318 | * @queue: crq_queue to initialize and register | |
319 | * @hostdata: ibmvscsi_host_data of host | |
320 | * | |
321 | * Allocates a page for messages, maps it for dma, and registers | |
322 | * the crq with the hypervisor. | |
323 | * Returns zero on success. | |
324 | */ | |
325 | static int ibmvscsi_init_crq_queue(struct crq_queue *queue, | |
326 | struct ibmvscsi_host_data *hostdata, | |
327 | int max_requests) | |
328 | { | |
329 | int rc; | |
330 | int retrc; | |
331 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
332 | ||
333 | queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL); | |
334 | ||
335 | if (!queue->msgs) | |
336 | goto malloc_failed; | |
337 | queue->size = PAGE_SIZE / sizeof(*queue->msgs); | |
338 | ||
339 | queue->msg_token = dma_map_single(hostdata->dev, queue->msgs, | |
340 | queue->size * sizeof(*queue->msgs), | |
341 | DMA_BIDIRECTIONAL); | |
342 | ||
343 | if (dma_mapping_error(hostdata->dev, queue->msg_token)) | |
344 | goto map_failed; | |
345 | ||
346 | gather_partition_info(); | |
347 | set_adapter_info(hostdata); | |
348 | ||
349 | retrc = rc = plpar_hcall_norets(H_REG_CRQ, | |
350 | vdev->unit_address, | |
351 | queue->msg_token, PAGE_SIZE); | |
352 | if (rc == H_RESOURCE) | |
353 | /* maybe kexecing and resource is busy. try a reset */ | |
354 | rc = ibmvscsi_reset_crq_queue(queue, | |
355 | hostdata); | |
356 | ||
06cdbeff | 357 | if (rc == H_CLOSED) { |
9965c2f1 BH |
358 | /* Adapter is good, but other end is not ready */ |
359 | dev_warn(hostdata->dev, "Partner adapter not ready\n"); | |
360 | retrc = 0; | |
361 | } else if (rc != 0) { | |
362 | dev_warn(hostdata->dev, "Error %d opening adapter\n", rc); | |
363 | goto reg_crq_failed; | |
364 | } | |
365 | ||
366 | queue->cur = 0; | |
367 | spin_lock_init(&queue->lock); | |
368 | ||
369 | tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task, | |
370 | (unsigned long)hostdata); | |
371 | ||
372 | if (request_irq(vdev->irq, | |
373 | ibmvscsi_handle_event, | |
374 | 0, "ibmvscsi", (void *)hostdata) != 0) { | |
375 | dev_err(hostdata->dev, "couldn't register irq 0x%x\n", | |
376 | vdev->irq); | |
377 | goto req_irq_failed; | |
378 | } | |
379 | ||
380 | rc = vio_enable_interrupts(vdev); | |
381 | if (rc != 0) { | |
382 | dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc); | |
383 | goto req_irq_failed; | |
384 | } | |
385 | ||
386 | return retrc; | |
387 | ||
388 | req_irq_failed: | |
389 | tasklet_kill(&hostdata->srp_task); | |
390 | rc = 0; | |
391 | do { | |
392 | if (rc) | |
393 | msleep(100); | |
394 | rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); | |
395 | } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); | |
396 | reg_crq_failed: | |
397 | dma_unmap_single(hostdata->dev, | |
398 | queue->msg_token, | |
399 | queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL); | |
400 | map_failed: | |
401 | free_page((unsigned long)queue->msgs); | |
402 | malloc_failed: | |
403 | return -1; | |
404 | } | |
405 | ||
406 | /** | |
407 | * reenable_crq_queue: - reenables a crq after | |
408 | * @queue: crq_queue to initialize and register | |
409 | * @hostdata: ibmvscsi_host_data of host | |
410 | * | |
411 | */ | |
412 | static int ibmvscsi_reenable_crq_queue(struct crq_queue *queue, | |
413 | struct ibmvscsi_host_data *hostdata) | |
414 | { | |
415 | int rc = 0; | |
416 | struct vio_dev *vdev = to_vio_dev(hostdata->dev); | |
417 | ||
418 | /* Re-enable the CRQ */ | |
419 | do { | |
420 | if (rc) | |
421 | msleep(100); | |
422 | rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address); | |
423 | } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc))); | |
424 | ||
425 | if (rc) | |
426 | dev_err(hostdata->dev, "Error %d enabling adapter\n", rc); | |
427 | return rc; | |
428 | } | |
429 | ||
1da177e4 LT |
430 | /* ------------------------------------------------------------ |
431 | * Routines for the event pool and event structs | |
432 | */ | |
433 | /** | |
434 | * initialize_event_pool: - Allocates and initializes the event pool for a host | |
435 | * @pool: event_pool to be initialized | |
436 | * @size: Number of events in pool | |
437 | * @hostdata: ibmvscsi_host_data who owns the event pool | |
438 | * | |
439 | * Returns zero on success. | |
440 | */ | |
441 | static int initialize_event_pool(struct event_pool *pool, | |
442 | int size, struct ibmvscsi_host_data *hostdata) | |
443 | { | |
444 | int i; | |
445 | ||
446 | pool->size = size; | |
447 | pool->next = 0; | |
4c021dd1 | 448 | pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL); |
1da177e4 LT |
449 | if (!pool->events) |
450 | return -ENOMEM; | |
1da177e4 LT |
451 | |
452 | pool->iu_storage = | |
453 | dma_alloc_coherent(hostdata->dev, | |
454 | pool->size * sizeof(*pool->iu_storage), | |
455 | &pool->iu_token, 0); | |
456 | if (!pool->iu_storage) { | |
457 | kfree(pool->events); | |
458 | return -ENOMEM; | |
459 | } | |
460 | ||
461 | for (i = 0; i < pool->size; ++i) { | |
462 | struct srp_event_struct *evt = &pool->events[i]; | |
463 | memset(&evt->crq, 0x00, sizeof(evt->crq)); | |
464 | atomic_set(&evt->free, 1); | |
55c9b1e5 | 465 | evt->crq.valid = VIOSRP_CRQ_CMD_RSP; |
72264eb6 AB |
466 | evt->crq.IU_length = cpu_to_be16(sizeof(*evt->xfer_iu)); |
467 | evt->crq.IU_data_ptr = cpu_to_be64(pool->iu_token + | |
468 | sizeof(*evt->xfer_iu) * i); | |
1da177e4 LT |
469 | evt->xfer_iu = pool->iu_storage + i; |
470 | evt->hostdata = hostdata; | |
4dddbc26 JB |
471 | evt->ext_list = NULL; |
472 | evt->ext_list_token = 0; | |
1da177e4 LT |
473 | } |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
478 | /** | |
479 | * release_event_pool: - Frees memory of an event pool of a host | |
480 | * @pool: event_pool to be released | |
481 | * @hostdata: ibmvscsi_host_data who owns the even pool | |
482 | * | |
483 | * Returns zero on success. | |
484 | */ | |
485 | static void release_event_pool(struct event_pool *pool, | |
486 | struct ibmvscsi_host_data *hostdata) | |
487 | { | |
488 | int i, in_use = 0; | |
4dddbc26 | 489 | for (i = 0; i < pool->size; ++i) { |
1da177e4 LT |
490 | if (atomic_read(&pool->events[i].free) != 1) |
491 | ++in_use; | |
4dddbc26 JB |
492 | if (pool->events[i].ext_list) { |
493 | dma_free_coherent(hostdata->dev, | |
ef265673 | 494 | SG_ALL * sizeof(struct srp_direct_buf), |
4dddbc26 JB |
495 | pool->events[i].ext_list, |
496 | pool->events[i].ext_list_token); | |
497 | } | |
498 | } | |
1da177e4 | 499 | if (in_use) |
6c0a60ec BK |
500 | dev_warn(hostdata->dev, "releasing event pool with %d " |
501 | "events still in use?\n", in_use); | |
1da177e4 LT |
502 | kfree(pool->events); |
503 | dma_free_coherent(hostdata->dev, | |
504 | pool->size * sizeof(*pool->iu_storage), | |
505 | pool->iu_storage, pool->iu_token); | |
506 | } | |
507 | ||
508 | /** | |
509 | * valid_event_struct: - Determines if event is valid. | |
510 | * @pool: event_pool that contains the event | |
511 | * @evt: srp_event_struct to be checked for validity | |
512 | * | |
513 | * Returns zero if event is invalid, one otherwise. | |
514 | */ | |
515 | static int valid_event_struct(struct event_pool *pool, | |
516 | struct srp_event_struct *evt) | |
517 | { | |
518 | int index = evt - pool->events; | |
519 | if (index < 0 || index >= pool->size) /* outside of bounds */ | |
520 | return 0; | |
521 | if (evt != pool->events + index) /* unaligned */ | |
522 | return 0; | |
523 | return 1; | |
524 | } | |
525 | ||
526 | /** | |
527 | * ibmvscsi_free-event_struct: - Changes status of event to "free" | |
528 | * @pool: event_pool that contains the event | |
529 | * @evt: srp_event_struct to be modified | |
530 | * | |
531 | */ | |
532 | static void free_event_struct(struct event_pool *pool, | |
533 | struct srp_event_struct *evt) | |
534 | { | |
535 | if (!valid_event_struct(pool, evt)) { | |
6c0a60ec BK |
536 | dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p " |
537 | "(not in pool %p)\n", evt, pool->events); | |
1da177e4 LT |
538 | return; |
539 | } | |
540 | if (atomic_inc_return(&evt->free) != 1) { | |
6c0a60ec BK |
541 | dev_err(evt->hostdata->dev, "Freeing event_struct %p " |
542 | "which is not in use!\n", evt); | |
1da177e4 LT |
543 | return; |
544 | } | |
545 | } | |
546 | ||
547 | /** | |
548 | * get_evt_struct: - Gets the next free event in pool | |
549 | * @pool: event_pool that contains the events to be searched | |
550 | * | |
551 | * Returns the next event in "free" state, and NULL if none are free. | |
552 | * Note that no synchronization is done here, we assume the host_lock | |
553 | * will syncrhonze things. | |
554 | */ | |
555 | static struct srp_event_struct *get_event_struct(struct event_pool *pool) | |
556 | { | |
557 | int i; | |
558 | int poolsize = pool->size; | |
559 | int offset = pool->next; | |
560 | ||
561 | for (i = 0; i < poolsize; i++) { | |
562 | offset = (offset + 1) % poolsize; | |
563 | if (!atomic_dec_if_positive(&pool->events[offset].free)) { | |
564 | pool->next = offset; | |
565 | return &pool->events[offset]; | |
566 | } | |
567 | } | |
568 | ||
569 | printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n"); | |
570 | return NULL; | |
571 | } | |
572 | ||
573 | /** | |
574 | * init_event_struct: Initialize fields in an event struct that are always | |
575 | * required. | |
576 | * @evt: The event | |
577 | * @done: Routine to call when the event is responded to | |
578 | * @format: SRP or MAD format | |
579 | * @timeout: timeout value set in the CRQ | |
580 | */ | |
581 | static void init_event_struct(struct srp_event_struct *evt_struct, | |
582 | void (*done) (struct srp_event_struct *), | |
583 | u8 format, | |
584 | int timeout) | |
585 | { | |
586 | evt_struct->cmnd = NULL; | |
587 | evt_struct->cmnd_done = NULL; | |
588 | evt_struct->sync_srp = NULL; | |
589 | evt_struct->crq.format = format; | |
72264eb6 | 590 | evt_struct->crq.timeout = cpu_to_be16(timeout); |
1da177e4 LT |
591 | evt_struct->done = done; |
592 | } | |
593 | ||
594 | /* ------------------------------------------------------------ | |
595 | * Routines for receiving SCSI responses from the hosting partition | |
596 | */ | |
597 | ||
598 | /** | |
599 | * set_srp_direction: Set the fields in the srp related to data | |
600 | * direction and number of buffers based on the direction in | |
601 | * the scsi_cmnd and the number of buffers | |
602 | */ | |
603 | static void set_srp_direction(struct scsi_cmnd *cmd, | |
604 | struct srp_cmd *srp_cmd, | |
605 | int numbuf) | |
606 | { | |
ef265673 FT |
607 | u8 fmt; |
608 | ||
1da177e4 LT |
609 | if (numbuf == 0) |
610 | return; | |
611 | ||
ef265673 FT |
612 | if (numbuf == 1) |
613 | fmt = SRP_DATA_DESC_DIRECT; | |
614 | else { | |
615 | fmt = SRP_DATA_DESC_INDIRECT; | |
616 | numbuf = min(numbuf, MAX_INDIRECT_BUFS); | |
617 | ||
1da177e4 | 618 | if (cmd->sc_data_direction == DMA_TO_DEVICE) |
ef265673 FT |
619 | srp_cmd->data_out_desc_cnt = numbuf; |
620 | else | |
621 | srp_cmd->data_in_desc_cnt = numbuf; | |
1da177e4 | 622 | } |
ef265673 FT |
623 | |
624 | if (cmd->sc_data_direction == DMA_TO_DEVICE) | |
625 | srp_cmd->buf_fmt = fmt << 4; | |
626 | else | |
627 | srp_cmd->buf_fmt = fmt; | |
1da177e4 LT |
628 | } |
629 | ||
630 | /** | |
631 | * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format | |
632 | * @cmd: srp_cmd whose additional_data member will be unmapped | |
633 | * @dev: device for which the memory is mapped | |
634 | * | |
635 | */ | |
4dddbc26 JB |
636 | static void unmap_cmd_data(struct srp_cmd *cmd, |
637 | struct srp_event_struct *evt_struct, | |
638 | struct device *dev) | |
1da177e4 | 639 | { |
ef265673 FT |
640 | u8 out_fmt, in_fmt; |
641 | ||
642 | out_fmt = cmd->buf_fmt >> 4; | |
643 | in_fmt = cmd->buf_fmt & ((1U << 4) - 1); | |
644 | ||
645 | if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC) | |
1da177e4 | 646 | return; |
4dddbc26 | 647 | |
a71fa1fc FT |
648 | if (evt_struct->cmnd) |
649 | scsi_dma_unmap(evt_struct->cmnd); | |
1da177e4 LT |
650 | } |
651 | ||
9413d7b8 | 652 | static int map_sg_list(struct scsi_cmnd *cmd, int nseg, |
ef265673 | 653 | struct srp_direct_buf *md) |
4dddbc26 JB |
654 | { |
655 | int i; | |
9413d7b8 | 656 | struct scatterlist *sg; |
4dddbc26 JB |
657 | u64 total_length = 0; |
658 | ||
9413d7b8 | 659 | scsi_for_each_sg(cmd, sg, nseg, i) { |
ef265673 | 660 | struct srp_direct_buf *descr = md + i; |
72264eb6 AB |
661 | descr->va = cpu_to_be64(sg_dma_address(sg)); |
662 | descr->len = cpu_to_be32(sg_dma_len(sg)); | |
ef265673 | 663 | descr->key = 0; |
9413d7b8 | 664 | total_length += sg_dma_len(sg); |
4dddbc26 JB |
665 | } |
666 | return total_length; | |
667 | } | |
668 | ||
1da177e4 LT |
669 | /** |
670 | * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields | |
91ebc1fa | 671 | * @cmd: struct scsi_cmnd with the scatterlist |
1da177e4 LT |
672 | * @srp_cmd: srp_cmd that contains the memory descriptor |
673 | * @dev: device for which to map dma memory | |
674 | * | |
675 | * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd. | |
676 | * Returns 1 on success. | |
677 | */ | |
678 | static int map_sg_data(struct scsi_cmnd *cmd, | |
4dddbc26 | 679 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
680 | struct srp_cmd *srp_cmd, struct device *dev) |
681 | { | |
682 | ||
4dddbc26 | 683 | int sg_mapped; |
1da177e4 | 684 | u64 total_length = 0; |
ef265673 FT |
685 | struct srp_direct_buf *data = |
686 | (struct srp_direct_buf *) srp_cmd->add_data; | |
687 | struct srp_indirect_buf *indirect = | |
688 | (struct srp_indirect_buf *) data; | |
1da177e4 | 689 | |
9413d7b8 FT |
690 | sg_mapped = scsi_dma_map(cmd); |
691 | if (!sg_mapped) | |
692 | return 1; | |
693 | else if (sg_mapped < 0) | |
1da177e4 LT |
694 | return 0; |
695 | ||
696 | set_srp_direction(cmd, srp_cmd, sg_mapped); | |
697 | ||
698 | /* special case; we can use a single direct descriptor */ | |
699 | if (sg_mapped == 1) { | |
9413d7b8 | 700 | map_sg_list(cmd, sg_mapped, data); |
1da177e4 LT |
701 | return 1; |
702 | } | |
703 | ||
ef265673 | 704 | indirect->table_desc.va = 0; |
72264eb6 AB |
705 | indirect->table_desc.len = cpu_to_be32(sg_mapped * |
706 | sizeof(struct srp_direct_buf)); | |
ef265673 | 707 | indirect->table_desc.key = 0; |
4dddbc26 JB |
708 | |
709 | if (sg_mapped <= MAX_INDIRECT_BUFS) { | |
9413d7b8 | 710 | total_length = map_sg_list(cmd, sg_mapped, |
ef265673 | 711 | &indirect->desc_list[0]); |
72264eb6 | 712 | indirect->len = cpu_to_be32(total_length); |
4dddbc26 | 713 | return 1; |
1da177e4 | 714 | } |
1da177e4 | 715 | |
4dddbc26 JB |
716 | /* get indirect table */ |
717 | if (!evt_struct->ext_list) { | |
ef265673 | 718 | evt_struct->ext_list = (struct srp_direct_buf *) |
9413d7b8 | 719 | dma_alloc_coherent(dev, |
ef265673 FT |
720 | SG_ALL * sizeof(struct srp_direct_buf), |
721 | &evt_struct->ext_list_token, 0); | |
4dddbc26 | 722 | if (!evt_struct->ext_list) { |
7912a0ac RJ |
723 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
724 | sdev_printk(KERN_ERR, cmd->device, | |
725 | "Can't allocate memory " | |
726 | "for indirect table\n"); | |
e637d553 | 727 | scsi_dma_unmap(cmd); |
4dddbc26 | 728 | return 0; |
4dddbc26 JB |
729 | } |
730 | } | |
731 | ||
9413d7b8 | 732 | total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list); |
4dddbc26 | 733 | |
72264eb6 AB |
734 | indirect->len = cpu_to_be32(total_length); |
735 | indirect->table_desc.va = cpu_to_be64(evt_struct->ext_list_token); | |
736 | indirect->table_desc.len = cpu_to_be32(sg_mapped * | |
737 | sizeof(indirect->desc_list[0])); | |
ef265673 FT |
738 | memcpy(indirect->desc_list, evt_struct->ext_list, |
739 | MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf)); | |
4dddbc26 | 740 | return 1; |
1da177e4 LT |
741 | } |
742 | ||
1da177e4 LT |
743 | /** |
744 | * map_data_for_srp_cmd: - Calls functions to map data for srp cmds | |
745 | * @cmd: struct scsi_cmnd with the memory to be mapped | |
746 | * @srp_cmd: srp_cmd that contains the memory descriptor | |
747 | * @dev: dma device for which to map dma memory | |
748 | * | |
749 | * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds | |
750 | * Returns 1 on success. | |
751 | */ | |
752 | static int map_data_for_srp_cmd(struct scsi_cmnd *cmd, | |
4dddbc26 | 753 | struct srp_event_struct *evt_struct, |
1da177e4 LT |
754 | struct srp_cmd *srp_cmd, struct device *dev) |
755 | { | |
756 | switch (cmd->sc_data_direction) { | |
757 | case DMA_FROM_DEVICE: | |
758 | case DMA_TO_DEVICE: | |
759 | break; | |
760 | case DMA_NONE: | |
761 | return 1; | |
762 | case DMA_BIDIRECTIONAL: | |
6c0a60ec BK |
763 | sdev_printk(KERN_ERR, cmd->device, |
764 | "Can't map DMA_BIDIRECTIONAL to read/write\n"); | |
1da177e4 LT |
765 | return 0; |
766 | default: | |
6c0a60ec BK |
767 | sdev_printk(KERN_ERR, cmd->device, |
768 | "Unknown data direction 0x%02x; can't map!\n", | |
769 | cmd->sc_data_direction); | |
1da177e4 LT |
770 | return 0; |
771 | } | |
772 | ||
9413d7b8 | 773 | return map_sg_data(cmd, evt_struct, srp_cmd, dev); |
1da177e4 LT |
774 | } |
775 | ||
3d0e91f7 BK |
776 | /** |
777 | * purge_requests: Our virtual adapter just shut down. purge any sent requests | |
778 | * @hostdata: the adapter | |
779 | */ | |
780 | static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code) | |
781 | { | |
1117ef8a | 782 | struct srp_event_struct *evt; |
3d0e91f7 BK |
783 | unsigned long flags; |
784 | ||
785 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1117ef8a BK |
786 | while (!list_empty(&hostdata->sent)) { |
787 | evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list); | |
788 | list_del(&evt->list); | |
789 | del_timer(&evt->timer); | |
790 | ||
791 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
792 | if (evt->cmnd) { | |
793 | evt->cmnd->result = (error_code << 16); | |
794 | unmap_cmd_data(&evt->iu.srp.cmd, evt, | |
795 | evt->hostdata->dev); | |
796 | if (evt->cmnd_done) | |
797 | evt->cmnd_done(evt->cmnd); | |
9ee75597 BK |
798 | } else if (evt->done && evt->crq.format != VIOSRP_MAD_FORMAT && |
799 | evt->iu.srp.login_req.opcode != SRP_LOGIN_REQ) | |
1117ef8a BK |
800 | evt->done(evt); |
801 | free_event_struct(&evt->hostdata->pool, evt); | |
802 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
3d0e91f7 BK |
803 | } |
804 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
805 | } | |
806 | ||
807 | /** | |
808 | * ibmvscsi_reset_host - Reset the connection to the server | |
809 | * @hostdata: struct ibmvscsi_host_data to reset | |
810 | */ | |
811 | static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata) | |
812 | { | |
813 | scsi_block_requests(hostdata->host); | |
814 | atomic_set(&hostdata->request_limit, 0); | |
815 | ||
816 | purge_requests(hostdata, DID_ERROR); | |
6e40de8b | 817 | hostdata->action = IBMVSCSI_HOST_ACTION_RESET; |
0f33ece5 | 818 | wake_up(&hostdata->work_wait_q); |
3d0e91f7 BK |
819 | } |
820 | ||
821 | /** | |
822 | * ibmvscsi_timeout - Internal command timeout handler | |
823 | * @evt_struct: struct srp_event_struct that timed out | |
824 | * | |
825 | * Called when an internally generated command times out | |
826 | */ | |
9a5d04fc | 827 | static void ibmvscsi_timeout(struct timer_list *t) |
3d0e91f7 | 828 | { |
9a5d04fc | 829 | struct srp_event_struct *evt_struct = from_timer(evt_struct, t, timer); |
3d0e91f7 BK |
830 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; |
831 | ||
832 | dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n", | |
833 | evt_struct->iu.srp.cmd.opcode); | |
834 | ||
835 | ibmvscsi_reset_host(hostdata); | |
836 | } | |
837 | ||
838 | ||
1da177e4 LT |
839 | /* ------------------------------------------------------------ |
840 | * Routines for sending and receiving SRPs | |
841 | */ | |
842 | /** | |
843 | * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq() | |
844 | * @evt_struct: evt_struct to be sent | |
845 | * @hostdata: ibmvscsi_host_data of host | |
3d0e91f7 | 846 | * @timeout: timeout in seconds - 0 means do not time command |
1da177e4 LT |
847 | * |
848 | * Returns the value returned from ibmvscsi_send_crq(). (Zero for success) | |
849 | * Note that this routine assumes that host_lock is held for synchronization | |
850 | */ | |
851 | static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct, | |
3d0e91f7 BK |
852 | struct ibmvscsi_host_data *hostdata, |
853 | unsigned long timeout) | |
1da177e4 | 854 | { |
72264eb6 | 855 | __be64 *crq_as_u64 = (__be64 *)&evt_struct->crq; |
3c887e8a | 856 | int request_status = 0; |
1da177e4 | 857 | int rc; |
f3a9c4d7 | 858 | int srp_req = 0; |
1da177e4 | 859 | |
a897ff2a RJ |
860 | /* If we have exhausted our request limit, just fail this request, |
861 | * unless it is for a reset or abort. | |
1da177e4 LT |
862 | * Note that there are rare cases involving driver generated requests |
863 | * (such as task management requests) that the mid layer may think we | |
864 | * can handle more requests (can_queue) when we actually can't | |
865 | */ | |
cefbda2d | 866 | if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) { |
f3a9c4d7 | 867 | srp_req = 1; |
cefbda2d DB |
868 | request_status = |
869 | atomic_dec_if_positive(&hostdata->request_limit); | |
870 | /* If request limit was -1 when we started, it is now even | |
871 | * less than that | |
872 | */ | |
873 | if (request_status < -1) | |
874 | goto send_error; | |
a897ff2a | 875 | /* Otherwise, we may have run out of requests. */ |
3c887e8a RJ |
876 | /* If request limit was 0 when we started the adapter is in the |
877 | * process of performing a login with the server adapter, or | |
878 | * we may have run out of requests. | |
879 | */ | |
880 | else if (request_status == -1 && | |
881 | evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ) | |
882 | goto send_busy; | |
a897ff2a RJ |
883 | /* Abort and reset calls should make it through. |
884 | * Nothing except abort and reset should use the last two | |
885 | * slots unless we had two or less to begin with. | |
886 | */ | |
887 | else if (request_status < 2 && | |
888 | evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) { | |
889 | /* In the case that we have less than two requests | |
890 | * available, check the server limit as a combination | |
891 | * of the request limit and the number of requests | |
892 | * in-flight (the size of the send list). If the | |
893 | * server limit is greater than 2, return busy so | |
894 | * that the last two are reserved for reset and abort. | |
895 | */ | |
896 | int server_limit = request_status; | |
897 | struct srp_event_struct *tmp_evt; | |
898 | ||
899 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
900 | server_limit++; | |
901 | } | |
902 | ||
903 | if (server_limit > 2) | |
904 | goto send_busy; | |
905 | } | |
cefbda2d | 906 | } |
1da177e4 LT |
907 | |
908 | /* Copy the IU into the transfer area */ | |
909 | *evt_struct->xfer_iu = evt_struct->iu; | |
ef265673 | 910 | evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct; |
1da177e4 LT |
911 | |
912 | /* Add this to the sent list. We need to do this | |
913 | * before we actually send | |
914 | * in case it comes back REALLY fast | |
915 | */ | |
916 | list_add_tail(&evt_struct->list, &hostdata->sent); | |
917 | ||
9a5d04fc | 918 | timer_setup(&evt_struct->timer, ibmvscsi_timeout, 0); |
3d0e91f7 | 919 | if (timeout) { |
3d0e91f7 | 920 | evt_struct->timer.expires = jiffies + (timeout * HZ); |
3d0e91f7 BK |
921 | add_timer(&evt_struct->timer); |
922 | } | |
923 | ||
72264eb6 AB |
924 | rc = ibmvscsi_send_crq(hostdata, be64_to_cpu(crq_as_u64[0]), |
925 | be64_to_cpu(crq_as_u64[1])); | |
926 | if (rc != 0) { | |
1da177e4 | 927 | list_del(&evt_struct->list); |
3d0e91f7 | 928 | del_timer(&evt_struct->timer); |
1da177e4 | 929 | |
860784c8 RJ |
930 | /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY. |
931 | * Firmware will send a CRQ with a transport event (0xFF) to | |
932 | * tell this client what has happened to the transport. This | |
933 | * will be handled in ibmvscsi_handle_crq() | |
934 | */ | |
935 | if (rc == H_CLOSED) { | |
936 | dev_warn(hostdata->dev, "send warning. " | |
937 | "Receive queue closed, will retry.\n"); | |
938 | goto send_busy; | |
939 | } | |
6c0a60ec | 940 | dev_err(hostdata->dev, "send error %d\n", rc); |
f3a9c4d7 BK |
941 | if (srp_req) |
942 | atomic_inc(&hostdata->request_limit); | |
1da177e4 LT |
943 | goto send_error; |
944 | } | |
945 | ||
946 | return 0; | |
947 | ||
cefbda2d | 948 | send_busy: |
4dddbc26 | 949 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); |
1da177e4 | 950 | |
1da177e4 | 951 | free_event_struct(&hostdata->pool, evt_struct); |
f3a9c4d7 | 952 | if (srp_req && request_status != -1) |
3c887e8a | 953 | atomic_inc(&hostdata->request_limit); |
a897ff2a | 954 | return SCSI_MLQUEUE_HOST_BUSY; |
cefbda2d DB |
955 | |
956 | send_error: | |
957 | unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev); | |
958 | ||
959 | if (evt_struct->cmnd != NULL) { | |
960 | evt_struct->cmnd->result = DID_ERROR << 16; | |
961 | evt_struct->cmnd_done(evt_struct->cmnd); | |
962 | } else if (evt_struct->done) | |
963 | evt_struct->done(evt_struct); | |
964 | ||
965 | free_event_struct(&hostdata->pool, evt_struct); | |
966 | return 0; | |
1da177e4 LT |
967 | } |
968 | ||
969 | /** | |
970 | * handle_cmd_rsp: - Handle responses from commands | |
971 | * @evt_struct: srp_event_struct to be handled | |
972 | * | |
973 | * Used as a callback by when sending scsi cmds. | |
974 | * Gets called by ibmvscsi_handle_crq() | |
975 | */ | |
976 | static void handle_cmd_rsp(struct srp_event_struct *evt_struct) | |
977 | { | |
978 | struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp; | |
979 | struct scsi_cmnd *cmnd = evt_struct->cmnd; | |
980 | ||
ef265673 | 981 | if (unlikely(rsp->opcode != SRP_RSP)) { |
1da177e4 | 982 | if (printk_ratelimit()) |
6c0a60ec | 983 | dev_warn(evt_struct->hostdata->dev, |
15c92746 | 984 | "bad SRP RSP type %#02x\n", rsp->opcode); |
1da177e4 LT |
985 | } |
986 | ||
987 | if (cmnd) { | |
c3a3b55a | 988 | cmnd->result |= rsp->status; |
1da177e4 LT |
989 | if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION) |
990 | memcpy(cmnd->sense_buffer, | |
ef265673 | 991 | rsp->data, |
72264eb6 | 992 | be32_to_cpu(rsp->sense_data_len)); |
1da177e4 | 993 | unmap_cmd_data(&evt_struct->iu.srp.cmd, |
4dddbc26 | 994 | evt_struct, |
1da177e4 LT |
995 | evt_struct->hostdata->dev); |
996 | ||
ef265673 | 997 | if (rsp->flags & SRP_RSP_FLAG_DOOVER) |
72264eb6 AB |
998 | scsi_set_resid(cmnd, |
999 | be32_to_cpu(rsp->data_out_res_cnt)); | |
ef265673 | 1000 | else if (rsp->flags & SRP_RSP_FLAG_DIOVER) |
72264eb6 | 1001 | scsi_set_resid(cmnd, be32_to_cpu(rsp->data_in_res_cnt)); |
1da177e4 LT |
1002 | } |
1003 | ||
1004 | if (evt_struct->cmnd_done) | |
1005 | evt_struct->cmnd_done(cmnd); | |
1006 | } | |
1007 | ||
1008 | /** | |
1009 | * lun_from_dev: - Returns the lun of the scsi device | |
1010 | * @dev: struct scsi_device | |
1011 | * | |
1012 | */ | |
1013 | static inline u16 lun_from_dev(struct scsi_device *dev) | |
1014 | { | |
1015 | return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun; | |
1016 | } | |
1017 | ||
1018 | /** | |
1019 | * ibmvscsi_queue: - The queuecommand function of the scsi template | |
1020 | * @cmd: struct scsi_cmnd to be executed | |
1021 | * @done: Callback function to be called when cmd is completed | |
1022 | */ | |
f281233d | 1023 | static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd, |
1da177e4 LT |
1024 | void (*done) (struct scsi_cmnd *)) |
1025 | { | |
1026 | struct srp_cmd *srp_cmd; | |
1027 | struct srp_event_struct *evt_struct; | |
ef265673 | 1028 | struct srp_indirect_buf *indirect; |
7603e02e | 1029 | struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host); |
1da177e4 | 1030 | u16 lun = lun_from_dev(cmnd->device); |
ef265673 | 1031 | u8 out_fmt, in_fmt; |
1da177e4 | 1032 | |
c3a3b55a | 1033 | cmnd->result = (DID_OK << 16); |
1da177e4 LT |
1034 | evt_struct = get_event_struct(&hostdata->pool); |
1035 | if (!evt_struct) | |
1036 | return SCSI_MLQUEUE_HOST_BUSY; | |
1037 | ||
1da177e4 LT |
1038 | /* Set up the actual SRP IU */ |
1039 | srp_cmd = &evt_struct->iu.srp.cmd; | |
ef265673 FT |
1040 | memset(srp_cmd, 0x00, SRP_MAX_IU_LEN); |
1041 | srp_cmd->opcode = SRP_CMD; | |
64a87b24 | 1042 | memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb)); |
985aa495 | 1043 | int_to_scsilun(lun, &srp_cmd->lun); |
1da177e4 | 1044 | |
4dddbc26 | 1045 | if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) { |
7912a0ac RJ |
1046 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
1047 | sdev_printk(KERN_ERR, cmnd->device, | |
1048 | "couldn't convert cmd to srp_cmd\n"); | |
1da177e4 LT |
1049 | free_event_struct(&hostdata->pool, evt_struct); |
1050 | return SCSI_MLQUEUE_HOST_BUSY; | |
1051 | } | |
1052 | ||
4dddbc26 JB |
1053 | init_event_struct(evt_struct, |
1054 | handle_cmd_rsp, | |
1055 | VIOSRP_SRP_FORMAT, | |
242f9dcb | 1056 | cmnd->request->timeout/HZ); |
4dddbc26 JB |
1057 | |
1058 | evt_struct->cmnd = cmnd; | |
1059 | evt_struct->cmnd_done = done; | |
1060 | ||
1da177e4 | 1061 | /* Fix up dma address of the buffer itself */ |
ef265673 FT |
1062 | indirect = (struct srp_indirect_buf *) srp_cmd->add_data; |
1063 | out_fmt = srp_cmd->buf_fmt >> 4; | |
1064 | in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1); | |
1065 | if ((in_fmt == SRP_DATA_DESC_INDIRECT || | |
1066 | out_fmt == SRP_DATA_DESC_INDIRECT) && | |
1067 | indirect->table_desc.va == 0) { | |
72264eb6 AB |
1068 | indirect->table_desc.va = |
1069 | cpu_to_be64(be64_to_cpu(evt_struct->crq.IU_data_ptr) + | |
ef265673 | 1070 | offsetof(struct srp_cmd, add_data) + |
72264eb6 | 1071 | offsetof(struct srp_indirect_buf, desc_list)); |
1da177e4 LT |
1072 | } |
1073 | ||
3d0e91f7 | 1074 | return ibmvscsi_send_srp_event(evt_struct, hostdata, 0); |
1da177e4 LT |
1075 | } |
1076 | ||
f281233d JG |
1077 | static DEF_SCSI_QCMD(ibmvscsi_queuecommand) |
1078 | ||
1da177e4 LT |
1079 | /* ------------------------------------------------------------ |
1080 | * Routines for driver initialization | |
1081 | */ | |
3507e13f | 1082 | |
126c5cc3 BK |
1083 | /** |
1084 | * map_persist_bufs: - Pre-map persistent data for adapter logins | |
1085 | * @hostdata: ibmvscsi_host_data of host | |
1086 | * | |
1087 | * Map the capabilities and adapter info DMA buffers to avoid runtime failures. | |
1088 | * Return 1 on error, 0 on success. | |
1089 | */ | |
1090 | static int map_persist_bufs(struct ibmvscsi_host_data *hostdata) | |
1091 | { | |
1092 | ||
1093 | hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps, | |
1094 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
1095 | ||
1096 | if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) { | |
1097 | dev_err(hostdata->dev, "Unable to map capabilities buffer!\n"); | |
1098 | return 1; | |
1099 | } | |
1100 | ||
1101 | hostdata->adapter_info_addr = dma_map_single(hostdata->dev, | |
1102 | &hostdata->madapter_info, | |
1103 | sizeof(hostdata->madapter_info), | |
1104 | DMA_BIDIRECTIONAL); | |
1105 | if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) { | |
1106 | dev_err(hostdata->dev, "Unable to map adapter info buffer!\n"); | |
1107 | dma_unmap_single(hostdata->dev, hostdata->caps_addr, | |
1108 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
1109 | return 1; | |
1110 | } | |
1111 | ||
1112 | return 0; | |
1113 | } | |
1114 | ||
1115 | /** | |
1116 | * unmap_persist_bufs: - Unmap persistent data needed for adapter logins | |
1117 | * @hostdata: ibmvscsi_host_data of host | |
1118 | * | |
1119 | * Unmap the capabilities and adapter info DMA buffers | |
1120 | */ | |
1121 | static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata) | |
1122 | { | |
1123 | dma_unmap_single(hostdata->dev, hostdata->caps_addr, | |
1124 | sizeof(hostdata->caps), DMA_BIDIRECTIONAL); | |
1125 | ||
1126 | dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr, | |
1127 | sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL); | |
1128 | } | |
1129 | ||
3507e13f BK |
1130 | /** |
1131 | * login_rsp: - Handle response to SRP login request | |
1132 | * @evt_struct: srp_event_struct with the response | |
1133 | * | |
1134 | * Used as a "done" callback by when sending srp_login. Gets called | |
1135 | * by ibmvscsi_handle_crq() | |
1136 | */ | |
1137 | static void login_rsp(struct srp_event_struct *evt_struct) | |
1138 | { | |
1139 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1140 | switch (evt_struct->xfer_iu->srp.login_rsp.opcode) { | |
1141 | case SRP_LOGIN_RSP: /* it worked! */ | |
1142 | break; | |
1143 | case SRP_LOGIN_REJ: /* refused! */ | |
1144 | dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n", | |
1145 | evt_struct->xfer_iu->srp.login_rej.reason); | |
1146 | /* Login failed. */ | |
1147 | atomic_set(&hostdata->request_limit, -1); | |
1148 | return; | |
1149 | default: | |
1150 | dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n", | |
1151 | evt_struct->xfer_iu->srp.login_rsp.opcode); | |
1152 | /* Login failed. */ | |
1153 | atomic_set(&hostdata->request_limit, -1); | |
1154 | return; | |
1155 | } | |
1156 | ||
1157 | dev_info(hostdata->dev, "SRP_LOGIN succeeded\n"); | |
126c5cc3 | 1158 | hostdata->client_migrated = 0; |
3507e13f BK |
1159 | |
1160 | /* Now we know what the real request-limit is. | |
1161 | * This value is set rather than added to request_limit because | |
1162 | * request_limit could have been set to -1 by this client. | |
1163 | */ | |
1164 | atomic_set(&hostdata->request_limit, | |
72264eb6 | 1165 | be32_to_cpu(evt_struct->xfer_iu->srp.login_rsp.req_lim_delta)); |
3507e13f BK |
1166 | |
1167 | /* If we had any pending I/Os, kick them */ | |
aa343c69 TD |
1168 | hostdata->action = IBMVSCSI_HOST_ACTION_UNBLOCK; |
1169 | wake_up(&hostdata->work_wait_q); | |
3507e13f BK |
1170 | } |
1171 | ||
1172 | /** | |
1173 | * send_srp_login: - Sends the srp login | |
1174 | * @hostdata: ibmvscsi_host_data of host | |
1175 | * | |
1176 | * Returns zero if successful. | |
1177 | */ | |
1178 | static int send_srp_login(struct ibmvscsi_host_data *hostdata) | |
1179 | { | |
1180 | int rc; | |
1181 | unsigned long flags; | |
1182 | struct srp_login_req *login; | |
1183 | struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool); | |
1184 | ||
1185 | BUG_ON(!evt_struct); | |
1186 | init_event_struct(evt_struct, login_rsp, | |
1187 | VIOSRP_SRP_FORMAT, login_timeout); | |
1188 | ||
1189 | login = &evt_struct->iu.srp.login_req; | |
1190 | memset(login, 0, sizeof(*login)); | |
1191 | login->opcode = SRP_LOGIN_REQ; | |
72264eb6 AB |
1192 | login->req_it_iu_len = cpu_to_be32(sizeof(union srp_iu)); |
1193 | login->req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT | | |
1194 | SRP_BUF_FORMAT_INDIRECT); | |
3507e13f BK |
1195 | |
1196 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1197 | /* Start out with a request limit of 0, since this is negotiated in | |
1198 | * the login request we are just sending and login requests always | |
1199 | * get sent by the driver regardless of request_limit. | |
1200 | */ | |
1201 | atomic_set(&hostdata->request_limit, 0); | |
1202 | ||
1203 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2); | |
1204 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1205 | dev_info(hostdata->dev, "sent SRP login\n"); | |
1206 | return rc; | |
1207 | }; | |
1208 | ||
126c5cc3 BK |
1209 | /** |
1210 | * capabilities_rsp: - Handle response to MAD adapter capabilities request | |
1211 | * @evt_struct: srp_event_struct with the response | |
1212 | * | |
1213 | * Used as a "done" callback by when sending adapter_info. | |
1214 | */ | |
1215 | static void capabilities_rsp(struct srp_event_struct *evt_struct) | |
1216 | { | |
1217 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1218 | ||
1219 | if (evt_struct->xfer_iu->mad.capabilities.common.status) { | |
1220 | dev_err(hostdata->dev, "error 0x%X getting capabilities info\n", | |
1221 | evt_struct->xfer_iu->mad.capabilities.common.status); | |
1222 | } else { | |
72264eb6 AB |
1223 | if (hostdata->caps.migration.common.server_support != |
1224 | cpu_to_be16(SERVER_SUPPORTS_CAP)) | |
126c5cc3 BK |
1225 | dev_info(hostdata->dev, "Partition migration not supported\n"); |
1226 | ||
1227 | if (client_reserve) { | |
1228 | if (hostdata->caps.reserve.common.server_support == | |
72264eb6 | 1229 | cpu_to_be16(SERVER_SUPPORTS_CAP)) |
126c5cc3 BK |
1230 | dev_info(hostdata->dev, "Client reserve enabled\n"); |
1231 | else | |
1232 | dev_info(hostdata->dev, "Client reserve not supported\n"); | |
1233 | } | |
1234 | } | |
1235 | ||
1236 | send_srp_login(hostdata); | |
1237 | } | |
1238 | ||
1239 | /** | |
1240 | * send_mad_capabilities: - Sends the mad capabilities request | |
1241 | * and stores the result so it can be retrieved with | |
1242 | * @hostdata: ibmvscsi_host_data of host | |
1243 | */ | |
1244 | static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata) | |
1245 | { | |
1246 | struct viosrp_capabilities *req; | |
1247 | struct srp_event_struct *evt_struct; | |
1248 | unsigned long flags; | |
61c7a080 | 1249 | struct device_node *of_node = hostdata->dev->of_node; |
126c5cc3 BK |
1250 | const char *location; |
1251 | ||
1252 | evt_struct = get_event_struct(&hostdata->pool); | |
1253 | BUG_ON(!evt_struct); | |
1254 | ||
1255 | init_event_struct(evt_struct, capabilities_rsp, | |
1256 | VIOSRP_MAD_FORMAT, info_timeout); | |
1257 | ||
1258 | req = &evt_struct->iu.mad.capabilities; | |
1259 | memset(req, 0, sizeof(*req)); | |
1260 | ||
72264eb6 | 1261 | hostdata->caps.flags = cpu_to_be32(CAP_LIST_SUPPORTED); |
126c5cc3 | 1262 | if (hostdata->client_migrated) |
72264eb6 | 1263 | hostdata->caps.flags |= cpu_to_be32(CLIENT_MIGRATED); |
126c5cc3 | 1264 | |
a5445238 | 1265 | strlcpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev), |
126c5cc3 | 1266 | sizeof(hostdata->caps.name)); |
126c5cc3 BK |
1267 | |
1268 | location = of_get_property(of_node, "ibm,loc-code", NULL); | |
1269 | location = location ? location : dev_name(hostdata->dev); | |
a5445238 | 1270 | strlcpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc)); |
126c5cc3 | 1271 | |
72264eb6 AB |
1272 | req->common.type = cpu_to_be32(VIOSRP_CAPABILITIES_TYPE); |
1273 | req->buffer = cpu_to_be64(hostdata->caps_addr); | |
126c5cc3 | 1274 | |
72264eb6 AB |
1275 | hostdata->caps.migration.common.cap_type = |
1276 | cpu_to_be32(MIGRATION_CAPABILITIES); | |
1277 | hostdata->caps.migration.common.length = | |
1278 | cpu_to_be16(sizeof(hostdata->caps.migration)); | |
1279 | hostdata->caps.migration.common.server_support = | |
1280 | cpu_to_be16(SERVER_SUPPORTS_CAP); | |
1281 | hostdata->caps.migration.ecl = cpu_to_be32(1); | |
126c5cc3 BK |
1282 | |
1283 | if (client_reserve) { | |
72264eb6 AB |
1284 | hostdata->caps.reserve.common.cap_type = |
1285 | cpu_to_be32(RESERVATION_CAPABILITIES); | |
1286 | hostdata->caps.reserve.common.length = | |
1287 | cpu_to_be16(sizeof(hostdata->caps.reserve)); | |
1288 | hostdata->caps.reserve.common.server_support = | |
1289 | cpu_to_be16(SERVER_SUPPORTS_CAP); | |
1290 | hostdata->caps.reserve.type = | |
1291 | cpu_to_be32(CLIENT_RESERVE_SCSI_2); | |
1292 | req->common.length = | |
1293 | cpu_to_be16(sizeof(hostdata->caps)); | |
126c5cc3 | 1294 | } else |
72264eb6 AB |
1295 | req->common.length = cpu_to_be16(sizeof(hostdata->caps) - |
1296 | sizeof(hostdata->caps.reserve)); | |
126c5cc3 BK |
1297 | |
1298 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1299 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) | |
1300 | dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n"); | |
1301 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1302 | }; | |
1303 | ||
c1988e31 RJ |
1304 | /** |
1305 | * fast_fail_rsp: - Handle response to MAD enable fast fail | |
1306 | * @evt_struct: srp_event_struct with the response | |
1307 | * | |
1308 | * Used as a "done" callback by when sending enable fast fail. Gets called | |
1309 | * by ibmvscsi_handle_crq() | |
1310 | */ | |
1311 | static void fast_fail_rsp(struct srp_event_struct *evt_struct) | |
1312 | { | |
1313 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
72264eb6 | 1314 | u16 status = be16_to_cpu(evt_struct->xfer_iu->mad.fast_fail.common.status); |
c1988e31 RJ |
1315 | |
1316 | if (status == VIOSRP_MAD_NOT_SUPPORTED) | |
1317 | dev_err(hostdata->dev, "fast_fail not supported in server\n"); | |
1318 | else if (status == VIOSRP_MAD_FAILED) | |
1319 | dev_err(hostdata->dev, "fast_fail request failed\n"); | |
1320 | else if (status != VIOSRP_MAD_SUCCESS) | |
1321 | dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status); | |
1322 | ||
126c5cc3 | 1323 | send_mad_capabilities(hostdata); |
c1988e31 RJ |
1324 | } |
1325 | ||
1326 | /** | |
1327 | * init_host - Start host initialization | |
1328 | * @hostdata: ibmvscsi_host_data of host | |
1329 | * | |
1330 | * Returns zero if successful. | |
1331 | */ | |
1332 | static int enable_fast_fail(struct ibmvscsi_host_data *hostdata) | |
1333 | { | |
1334 | int rc; | |
1335 | unsigned long flags; | |
1336 | struct viosrp_fast_fail *fast_fail_mad; | |
1337 | struct srp_event_struct *evt_struct; | |
1338 | ||
126c5cc3 BK |
1339 | if (!fast_fail) { |
1340 | send_mad_capabilities(hostdata); | |
1341 | return 0; | |
1342 | } | |
c1988e31 RJ |
1343 | |
1344 | evt_struct = get_event_struct(&hostdata->pool); | |
1345 | BUG_ON(!evt_struct); | |
1346 | ||
1347 | init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout); | |
1348 | ||
1349 | fast_fail_mad = &evt_struct->iu.mad.fast_fail; | |
1350 | memset(fast_fail_mad, 0, sizeof(*fast_fail_mad)); | |
72264eb6 AB |
1351 | fast_fail_mad->common.type = cpu_to_be32(VIOSRP_ENABLE_FAST_FAIL); |
1352 | fast_fail_mad->common.length = cpu_to_be16(sizeof(*fast_fail_mad)); | |
c1988e31 RJ |
1353 | |
1354 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1355 | rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2); | |
1356 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1357 | return rc; | |
1358 | } | |
1359 | ||
1da177e4 LT |
1360 | /** |
1361 | * adapter_info_rsp: - Handle response to MAD adapter info request | |
1362 | * @evt_struct: srp_event_struct with the response | |
1363 | * | |
1364 | * Used as a "done" callback by when sending adapter_info. Gets called | |
1365 | * by ibmvscsi_handle_crq() | |
1366 | */ | |
1367 | static void adapter_info_rsp(struct srp_event_struct *evt_struct) | |
1368 | { | |
1369 | struct ibmvscsi_host_data *hostdata = evt_struct->hostdata; | |
1da177e4 LT |
1370 | |
1371 | if (evt_struct->xfer_iu->mad.adapter_info.common.status) { | |
6c0a60ec BK |
1372 | dev_err(hostdata->dev, "error %d getting adapter info\n", |
1373 | evt_struct->xfer_iu->mad.adapter_info.common.status); | |
1da177e4 | 1374 | } else { |
6c0a60ec BK |
1375 | dev_info(hostdata->dev, "host srp version: %s, " |
1376 | "host partition %s (%d), OS %d, max io %u\n", | |
1377 | hostdata->madapter_info.srp_version, | |
1378 | hostdata->madapter_info.partition_name, | |
72264eb6 AB |
1379 | be32_to_cpu(hostdata->madapter_info.partition_number), |
1380 | be32_to_cpu(hostdata->madapter_info.os_type), | |
1381 | be32_to_cpu(hostdata->madapter_info.port_max_txu[0])); | |
1da177e4 LT |
1382 | |
1383 | if (hostdata->madapter_info.port_max_txu[0]) | |
1384 | hostdata->host->max_sectors = | |
72264eb6 | 1385 | be32_to_cpu(hostdata->madapter_info.port_max_txu[0]) >> 9; |
154fb614 | 1386 | |
45d8c30f | 1387 | if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX && |
154fb614 | 1388 | strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) { |
6c0a60ec BK |
1389 | dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n", |
1390 | hostdata->madapter_info.srp_version); | |
1391 | dev_err(hostdata->dev, "limiting scatterlists to %d\n", | |
1392 | MAX_INDIRECT_BUFS); | |
154fb614 DB |
1393 | hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS; |
1394 | } | |
e08afeb7 | 1395 | |
45d8c30f | 1396 | if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX) { |
e08afeb7 BK |
1397 | enable_fast_fail(hostdata); |
1398 | return; | |
1399 | } | |
1da177e4 | 1400 | } |
3507e13f | 1401 | |
e08afeb7 | 1402 | send_srp_login(hostdata); |
1da177e4 LT |
1403 | } |
1404 | ||
1405 | /** | |
1406 | * send_mad_adapter_info: - Sends the mad adapter info request | |
1407 | * and stores the result so it can be retrieved with | |
1408 | * sysfs. We COULD consider causing a failure if the | |
1409 | * returned SRP version doesn't match ours. | |
1410 | * @hostdata: ibmvscsi_host_data of host | |
1411 | * | |
1412 | * Returns zero if successful. | |
1413 | */ | |
1414 | static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata) | |
1415 | { | |
1416 | struct viosrp_adapter_info *req; | |
1417 | struct srp_event_struct *evt_struct; | |
06f923cb | 1418 | unsigned long flags; |
e5dbfa66 | 1419 | |
1da177e4 | 1420 | evt_struct = get_event_struct(&hostdata->pool); |
3507e13f | 1421 | BUG_ON(!evt_struct); |
1da177e4 LT |
1422 | |
1423 | init_event_struct(evt_struct, | |
1424 | adapter_info_rsp, | |
1425 | VIOSRP_MAD_FORMAT, | |
e1a5ce5b | 1426 | info_timeout); |
1da177e4 LT |
1427 | |
1428 | req = &evt_struct->iu.mad.adapter_info; | |
1429 | memset(req, 0x00, sizeof(*req)); | |
1430 | ||
72264eb6 AB |
1431 | req->common.type = cpu_to_be32(VIOSRP_ADAPTER_INFO_TYPE); |
1432 | req->common.length = cpu_to_be16(sizeof(hostdata->madapter_info)); | |
1433 | req->buffer = cpu_to_be64(hostdata->adapter_info_addr); | |
1da177e4 | 1434 | |
06f923cb | 1435 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
126c5cc3 | 1436 | if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2)) |
6c0a60ec | 1437 | dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n"); |
06f923cb | 1438 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1439 | }; |
1440 | ||
1441 | /** | |
3507e13f | 1442 | * init_adapter: Start virtual adapter initialization sequence |
1da177e4 | 1443 | * |
3507e13f BK |
1444 | */ |
1445 | static void init_adapter(struct ibmvscsi_host_data *hostdata) | |
1da177e4 | 1446 | { |
1da177e4 | 1447 | send_mad_adapter_info(hostdata); |
1da177e4 LT |
1448 | } |
1449 | ||
1da177e4 LT |
1450 | /** |
1451 | * sync_completion: Signal that a synchronous command has completed | |
1452 | * Note that after returning from this call, the evt_struct is freed. | |
1453 | * the caller waiting on this completion shouldn't touch the evt_struct | |
1454 | * again. | |
1455 | */ | |
1456 | static void sync_completion(struct srp_event_struct *evt_struct) | |
1457 | { | |
1458 | /* copy the response back */ | |
1459 | if (evt_struct->sync_srp) | |
1460 | *evt_struct->sync_srp = *evt_struct->xfer_iu; | |
1461 | ||
1462 | complete(&evt_struct->comp); | |
1463 | } | |
1464 | ||
1465 | /** | |
1466 | * ibmvscsi_abort: Abort a command...from scsi host template | |
1467 | * send this over to the server and wait synchronously for the response | |
1468 | */ | |
1469 | static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd) | |
1470 | { | |
7603e02e | 1471 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
1472 | struct srp_tsk_mgmt *tsk_mgmt; |
1473 | struct srp_event_struct *evt; | |
1474 | struct srp_event_struct *tmp_evt, *found_evt; | |
1475 | union viosrp_iu srp_rsp; | |
1476 | int rsp_rc; | |
be042f24 | 1477 | unsigned long flags; |
1da177e4 | 1478 | u16 lun = lun_from_dev(cmd->device); |
860784c8 | 1479 | unsigned long wait_switch = 0; |
1da177e4 LT |
1480 | |
1481 | /* First, find this command in our sent list so we can figure | |
1482 | * out the correct tag | |
1483 | */ | |
be042f24 | 1484 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
860784c8 RJ |
1485 | wait_switch = jiffies + (init_timeout * HZ); |
1486 | do { | |
1487 | found_evt = NULL; | |
1488 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1489 | if (tmp_evt->cmnd == cmd) { | |
1490 | found_evt = tmp_evt; | |
1491 | break; | |
1492 | } | |
1da177e4 | 1493 | } |
1da177e4 | 1494 | |
860784c8 RJ |
1495 | if (!found_evt) { |
1496 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1497 | return SUCCESS; | |
1498 | } | |
1da177e4 | 1499 | |
860784c8 RJ |
1500 | evt = get_event_struct(&hostdata->pool); |
1501 | if (evt == NULL) { | |
1502 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1503 | sdev_printk(KERN_ERR, cmd->device, | |
1504 | "failed to allocate abort event\n"); | |
1505 | return FAILED; | |
1506 | } | |
1da177e4 | 1507 | |
860784c8 RJ |
1508 | init_event_struct(evt, |
1509 | sync_completion, | |
1510 | VIOSRP_SRP_FORMAT, | |
e1a5ce5b | 1511 | abort_timeout); |
1da177e4 | 1512 | |
860784c8 | 1513 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
1da177e4 | 1514 | |
860784c8 RJ |
1515 | /* Set up an abort SRP command */ |
1516 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
1517 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
985aa495 | 1518 | int_to_scsilun(lun, &tsk_mgmt->lun); |
860784c8 RJ |
1519 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK; |
1520 | tsk_mgmt->task_tag = (u64) found_evt; | |
1521 | ||
1522 | evt->sync_srp = &srp_rsp; | |
1523 | ||
1524 | init_completion(&evt->comp); | |
e1a5ce5b | 1525 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2); |
860784c8 RJ |
1526 | |
1527 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) | |
1528 | break; | |
1529 | ||
1530 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1531 | msleep(10); | |
1532 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1533 | } while (time_before(jiffies, wait_switch)); | |
1534 | ||
be042f24 | 1535 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
860784c8 | 1536 | |
be042f24 | 1537 | if (rsp_rc != 0) { |
6c0a60ec BK |
1538 | sdev_printk(KERN_ERR, cmd->device, |
1539 | "failed to send abort() event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1540 | return FAILED; |
1541 | } | |
1542 | ||
860784c8 | 1543 | sdev_printk(KERN_INFO, cmd->device, |
fe333321 | 1544 | "aborting command. lun 0x%llx, tag 0x%llx\n", |
860784c8 RJ |
1545 | (((u64) lun) << 48), (u64) found_evt); |
1546 | ||
1da177e4 | 1547 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1548 | |
1549 | /* make sure we got a good response */ | |
ef265673 | 1550 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1551 | if (printk_ratelimit()) |
6c0a60ec BK |
1552 | sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n", |
1553 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1554 | return FAILED; |
1555 | } | |
1556 | ||
ef265673 FT |
1557 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1558 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1559 | else |
1560 | rsp_rc = srp_rsp.srp.rsp.status; | |
1561 | ||
1562 | if (rsp_rc) { | |
1563 | if (printk_ratelimit()) | |
6c0a60ec | 1564 | sdev_printk(KERN_WARNING, cmd->device, |
fe333321 | 1565 | "abort code %d for task tag 0x%llx\n", |
6c0a60ec | 1566 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1567 | return FAILED; |
1568 | } | |
1569 | ||
1570 | /* Because we dropped the spinlock above, it's possible | |
1571 | * The event is no longer in our list. Make sure it didn't | |
1572 | * complete while we were aborting | |
1573 | */ | |
be042f24 | 1574 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1575 | found_evt = NULL; |
1576 | list_for_each_entry(tmp_evt, &hostdata->sent, list) { | |
1577 | if (tmp_evt->cmnd == cmd) { | |
1578 | found_evt = tmp_evt; | |
1579 | break; | |
1580 | } | |
1581 | } | |
1582 | ||
1583 | if (found_evt == NULL) { | |
be042f24 | 1584 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
fe333321 | 1585 | sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n", |
6c0a60ec | 1586 | tsk_mgmt->task_tag); |
1da177e4 LT |
1587 | return SUCCESS; |
1588 | } | |
1589 | ||
fe333321 | 1590 | sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n", |
6c0a60ec | 1591 | tsk_mgmt->task_tag); |
1da177e4 LT |
1592 | |
1593 | cmd->result = (DID_ABORT << 16); | |
1594 | list_del(&found_evt->list); | |
4dddbc26 JB |
1595 | unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt, |
1596 | found_evt->hostdata->dev); | |
1da177e4 | 1597 | free_event_struct(&found_evt->hostdata->pool, found_evt); |
be042f24 | 1598 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1599 | atomic_inc(&hostdata->request_limit); |
1600 | return SUCCESS; | |
1601 | } | |
1602 | ||
1603 | /** | |
1604 | * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host | |
1605 | * template send this over to the server and wait synchronously for the | |
1606 | * response | |
1607 | */ | |
1608 | static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd) | |
1609 | { | |
7603e02e | 1610 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 LT |
1611 | struct srp_tsk_mgmt *tsk_mgmt; |
1612 | struct srp_event_struct *evt; | |
1613 | struct srp_event_struct *tmp_evt, *pos; | |
1614 | union viosrp_iu srp_rsp; | |
1615 | int rsp_rc; | |
be042f24 | 1616 | unsigned long flags; |
1da177e4 | 1617 | u16 lun = lun_from_dev(cmd->device); |
860784c8 | 1618 | unsigned long wait_switch = 0; |
1da177e4 | 1619 | |
be042f24 | 1620 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
860784c8 RJ |
1621 | wait_switch = jiffies + (init_timeout * HZ); |
1622 | do { | |
1623 | evt = get_event_struct(&hostdata->pool); | |
1624 | if (evt == NULL) { | |
1625 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1626 | sdev_printk(KERN_ERR, cmd->device, | |
1627 | "failed to allocate reset event\n"); | |
1628 | return FAILED; | |
1629 | } | |
1da177e4 | 1630 | |
860784c8 RJ |
1631 | init_event_struct(evt, |
1632 | sync_completion, | |
1633 | VIOSRP_SRP_FORMAT, | |
e1a5ce5b | 1634 | reset_timeout); |
1da177e4 | 1635 | |
860784c8 | 1636 | tsk_mgmt = &evt->iu.srp.tsk_mgmt; |
1da177e4 | 1637 | |
860784c8 RJ |
1638 | /* Set up a lun reset SRP command */ |
1639 | memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); | |
1640 | tsk_mgmt->opcode = SRP_TSK_MGMT; | |
985aa495 | 1641 | int_to_scsilun(lun, &tsk_mgmt->lun); |
860784c8 | 1642 | tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET; |
1da177e4 | 1643 | |
860784c8 RJ |
1644 | evt->sync_srp = &srp_rsp; |
1645 | ||
1646 | init_completion(&evt->comp); | |
e1a5ce5b | 1647 | rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2); |
860784c8 RJ |
1648 | |
1649 | if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) | |
1650 | break; | |
1651 | ||
1652 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
1653 | msleep(10); | |
1654 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
1655 | } while (time_before(jiffies, wait_switch)); | |
1da177e4 | 1656 | |
be042f24 | 1657 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
860784c8 | 1658 | |
be042f24 | 1659 | if (rsp_rc != 0) { |
6c0a60ec BK |
1660 | sdev_printk(KERN_ERR, cmd->device, |
1661 | "failed to send reset event. rc=%d\n", rsp_rc); | |
1da177e4 LT |
1662 | return FAILED; |
1663 | } | |
1664 | ||
fe333321 | 1665 | sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n", |
860784c8 RJ |
1666 | (((u64) lun) << 48)); |
1667 | ||
1da177e4 | 1668 | wait_for_completion(&evt->comp); |
1da177e4 LT |
1669 | |
1670 | /* make sure we got a good response */ | |
ef265673 | 1671 | if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) { |
1da177e4 | 1672 | if (printk_ratelimit()) |
6c0a60ec BK |
1673 | sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n", |
1674 | srp_rsp.srp.rsp.opcode); | |
1da177e4 LT |
1675 | return FAILED; |
1676 | } | |
1677 | ||
ef265673 FT |
1678 | if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID) |
1679 | rsp_rc = *((int *)srp_rsp.srp.rsp.data); | |
1da177e4 LT |
1680 | else |
1681 | rsp_rc = srp_rsp.srp.rsp.status; | |
1682 | ||
1683 | if (rsp_rc) { | |
1684 | if (printk_ratelimit()) | |
6c0a60ec | 1685 | sdev_printk(KERN_WARNING, cmd->device, |
fe333321 | 1686 | "reset code %d for task tag 0x%llx\n", |
6c0a60ec | 1687 | rsp_rc, tsk_mgmt->task_tag); |
1da177e4 LT |
1688 | return FAILED; |
1689 | } | |
1690 | ||
1691 | /* We need to find all commands for this LUN that have not yet been | |
1692 | * responded to, and fail them with DID_RESET | |
1693 | */ | |
be042f24 | 1694 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
1da177e4 LT |
1695 | list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) { |
1696 | if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) { | |
1697 | if (tmp_evt->cmnd) | |
1698 | tmp_evt->cmnd->result = (DID_RESET << 16); | |
1699 | list_del(&tmp_evt->list); | |
4dddbc26 JB |
1700 | unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt, |
1701 | tmp_evt->hostdata->dev); | |
1da177e4 LT |
1702 | free_event_struct(&tmp_evt->hostdata->pool, |
1703 | tmp_evt); | |
1704 | atomic_inc(&hostdata->request_limit); | |
1705 | if (tmp_evt->cmnd_done) | |
1706 | tmp_evt->cmnd_done(tmp_evt->cmnd); | |
1707 | else if (tmp_evt->done) | |
1708 | tmp_evt->done(tmp_evt); | |
1709 | } | |
1710 | } | |
be042f24 | 1711 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
1da177e4 LT |
1712 | return SUCCESS; |
1713 | } | |
1714 | ||
1715 | /** | |
3d0e91f7 BK |
1716 | * ibmvscsi_eh_host_reset_handler - Reset the connection to the server |
1717 | * @cmd: struct scsi_cmnd having problems | |
1718 | */ | |
1719 | static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd) | |
1da177e4 | 1720 | { |
3d0e91f7 | 1721 | unsigned long wait_switch = 0; |
7603e02e | 1722 | struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host); |
1da177e4 | 1723 | |
3d0e91f7 BK |
1724 | dev_err(hostdata->dev, "Resetting connection due to error recovery\n"); |
1725 | ||
1726 | ibmvscsi_reset_host(hostdata); | |
1727 | ||
1728 | for (wait_switch = jiffies + (init_timeout * HZ); | |
1729 | time_before(jiffies, wait_switch) && | |
1730 | atomic_read(&hostdata->request_limit) < 2;) { | |
1731 | ||
1732 | msleep(10); | |
1da177e4 | 1733 | } |
3d0e91f7 BK |
1734 | |
1735 | if (atomic_read(&hostdata->request_limit) <= 0) | |
1736 | return FAILED; | |
1737 | ||
1738 | return SUCCESS; | |
1da177e4 LT |
1739 | } |
1740 | ||
1741 | /** | |
1742 | * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ | |
1743 | * @crq: Command/Response queue | |
1744 | * @hostdata: ibmvscsi_host_data of host | |
1745 | * | |
1746 | */ | |
9965c2f1 BH |
1747 | static void ibmvscsi_handle_crq(struct viosrp_crq *crq, |
1748 | struct ibmvscsi_host_data *hostdata) | |
1da177e4 | 1749 | { |
6c0a60ec | 1750 | long rc; |
1da177e4 | 1751 | unsigned long flags; |
72264eb6 | 1752 | /* The hypervisor copies our tag value here so no byteswapping */ |
1da177e4 | 1753 | struct srp_event_struct *evt_struct = |
72264eb6 | 1754 | (__force struct srp_event_struct *)crq->IU_data_ptr; |
1da177e4 | 1755 | switch (crq->valid) { |
55c9b1e5 | 1756 | case VIOSRP_CRQ_INIT_RSP: /* initialization */ |
1da177e4 | 1757 | switch (crq->format) { |
55c9b1e5 | 1758 | case VIOSRP_CRQ_INIT: /* Initialization message */ |
6c0a60ec | 1759 | dev_info(hostdata->dev, "partner initialized\n"); |
1da177e4 | 1760 | /* Send back a response */ |
9965c2f1 BH |
1761 | rc = ibmvscsi_send_crq(hostdata, 0xC002000000000000LL, 0); |
1762 | if (rc == 0) { | |
1da177e4 | 1763 | /* Now login */ |
3507e13f | 1764 | init_adapter(hostdata); |
1da177e4 | 1765 | } else { |
6c0a60ec | 1766 | dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc); |
1da177e4 LT |
1767 | } |
1768 | ||
1769 | break; | |
55c9b1e5 | 1770 | case VIOSRP_CRQ_INIT_COMPLETE: /* Initialization response */ |
6c0a60ec | 1771 | dev_info(hostdata->dev, "partner initialization complete\n"); |
1da177e4 LT |
1772 | |
1773 | /* Now login */ | |
3507e13f | 1774 | init_adapter(hostdata); |
1da177e4 LT |
1775 | break; |
1776 | default: | |
6c0a60ec | 1777 | dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format); |
1da177e4 LT |
1778 | } |
1779 | return; | |
55c9b1e5 | 1780 | case VIOSRP_CRQ_XPORT_EVENT: /* Hypervisor telling us the connection is closed */ |
2b541f8f | 1781 | scsi_block_requests(hostdata->host); |
cefbda2d | 1782 | atomic_set(&hostdata->request_limit, 0); |
2b541f8f DB |
1783 | if (crq->format == 0x06) { |
1784 | /* We need to re-setup the interpartition connection */ | |
6c0a60ec | 1785 | dev_info(hostdata->dev, "Re-enabling adapter!\n"); |
126c5cc3 | 1786 | hostdata->client_migrated = 1; |
6e40de8b | 1787 | hostdata->action = IBMVSCSI_HOST_ACTION_REENABLE; |
2b541f8f | 1788 | purge_requests(hostdata, DID_REQUEUE); |
0f33ece5 | 1789 | wake_up(&hostdata->work_wait_q); |
2b541f8f | 1790 | } else { |
6c0a60ec BK |
1791 | dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n", |
1792 | crq->format); | |
0f33ece5 | 1793 | ibmvscsi_reset_host(hostdata); |
2b541f8f | 1794 | } |
1da177e4 | 1795 | return; |
55c9b1e5 | 1796 | case VIOSRP_CRQ_CMD_RSP: /* real payload */ |
1da177e4 LT |
1797 | break; |
1798 | default: | |
6c0a60ec BK |
1799 | dev_err(hostdata->dev, "got an invalid message type 0x%02x\n", |
1800 | crq->valid); | |
1da177e4 LT |
1801 | return; |
1802 | } | |
1803 | ||
1804 | /* The only kind of payload CRQs we should get are responses to | |
1805 | * things we send. Make sure this response is to something we | |
1806 | * actually sent | |
1807 | */ | |
1808 | if (!valid_event_struct(&hostdata->pool, evt_struct)) { | |
6c0a60ec | 1809 | dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n", |
72264eb6 | 1810 | evt_struct); |
1da177e4 LT |
1811 | return; |
1812 | } | |
1813 | ||
1814 | if (atomic_read(&evt_struct->free)) { | |
6c0a60ec | 1815 | dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n", |
72264eb6 | 1816 | evt_struct); |
1da177e4 LT |
1817 | return; |
1818 | } | |
1819 | ||
1820 | if (crq->format == VIOSRP_SRP_FORMAT) | |
72264eb6 | 1821 | atomic_add(be32_to_cpu(evt_struct->xfer_iu->srp.rsp.req_lim_delta), |
1da177e4 LT |
1822 | &hostdata->request_limit); |
1823 | ||
3d0e91f7 BK |
1824 | del_timer(&evt_struct->timer); |
1825 | ||
ca61668b | 1826 | if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd) |
c3a3b55a | 1827 | evt_struct->cmnd->result = DID_ERROR << 16; |
1da177e4 LT |
1828 | if (evt_struct->done) |
1829 | evt_struct->done(evt_struct); | |
1830 | else | |
6c0a60ec | 1831 | dev_err(hostdata->dev, "returned done() is NULL; not running it!\n"); |
1da177e4 LT |
1832 | |
1833 | /* | |
1834 | * Lock the host_lock before messing with these structures, since we | |
1835 | * are running in a task context | |
1836 | */ | |
1837 | spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags); | |
1838 | list_del(&evt_struct->list); | |
1839 | free_event_struct(&evt_struct->hostdata->pool, evt_struct); | |
1840 | spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags); | |
1841 | } | |
1842 | ||
0979c84b RJ |
1843 | /** |
1844 | * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk. | |
1845 | * @sdev: struct scsi_device device to configure | |
1846 | * | |
1847 | * Enable allow_restart for a device if it is a disk. Adjust the | |
1848 | * queue_depth here also as is required by the documentation for | |
1849 | * struct scsi_host_template. | |
1850 | */ | |
1851 | static int ibmvscsi_slave_configure(struct scsi_device *sdev) | |
1852 | { | |
1853 | struct Scsi_Host *shost = sdev->host; | |
1854 | unsigned long lock_flags = 0; | |
1855 | ||
1856 | spin_lock_irqsave(shost->host_lock, lock_flags); | |
d1a357fc | 1857 | if (sdev->type == TYPE_DISK) { |
0979c84b | 1858 | sdev->allow_restart = 1; |
e1a5ce5b | 1859 | blk_queue_rq_timeout(sdev->request_queue, 120 * HZ); |
d1a357fc | 1860 | } |
0979c84b RJ |
1861 | spin_unlock_irqrestore(shost->host_lock, lock_flags); |
1862 | return 0; | |
1863 | } | |
1864 | ||
742d25b8 BK |
1865 | /** |
1866 | * ibmvscsi_change_queue_depth - Change the device's queue depth | |
1867 | * @sdev: scsi device struct | |
1868 | * @qdepth: depth to set | |
e881a172 | 1869 | * @reason: calling context |
742d25b8 BK |
1870 | * |
1871 | * Return value: | |
1872 | * actual depth set | |
1873 | **/ | |
db5ed4df | 1874 | static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth) |
742d25b8 BK |
1875 | { |
1876 | if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN) | |
1877 | qdepth = IBMVSCSI_MAX_CMDS_PER_LUN; | |
db5ed4df | 1878 | return scsi_change_queue_depth(sdev, qdepth); |
742d25b8 BK |
1879 | } |
1880 | ||
1da177e4 LT |
1881 | /* ------------------------------------------------------------ |
1882 | * sysfs attributes | |
1883 | */ | |
126c5cc3 BK |
1884 | static ssize_t show_host_vhost_loc(struct device *dev, |
1885 | struct device_attribute *attr, char *buf) | |
1886 | { | |
1887 | struct Scsi_Host *shost = class_to_shost(dev); | |
1888 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); | |
1889 | int len; | |
1890 | ||
1891 | len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n", | |
1892 | hostdata->caps.loc); | |
1893 | return len; | |
1894 | } | |
1895 | ||
1896 | static struct device_attribute ibmvscsi_host_vhost_loc = { | |
1897 | .attr = { | |
1898 | .name = "vhost_loc", | |
1899 | .mode = S_IRUGO, | |
1900 | }, | |
1901 | .show = show_host_vhost_loc, | |
1902 | }; | |
1903 | ||
1904 | static ssize_t show_host_vhost_name(struct device *dev, | |
1905 | struct device_attribute *attr, char *buf) | |
1906 | { | |
1907 | struct Scsi_Host *shost = class_to_shost(dev); | |
1908 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); | |
1909 | int len; | |
1910 | ||
1911 | len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n", | |
1912 | hostdata->caps.name); | |
1913 | return len; | |
1914 | } | |
1915 | ||
1916 | static struct device_attribute ibmvscsi_host_vhost_name = { | |
1917 | .attr = { | |
1918 | .name = "vhost_name", | |
1919 | .mode = S_IRUGO, | |
1920 | }, | |
1921 | .show = show_host_vhost_name, | |
1922 | }; | |
1923 | ||
ee959b00 TJ |
1924 | static ssize_t show_host_srp_version(struct device *dev, |
1925 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1926 | { |
ee959b00 | 1927 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1928 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1929 | int len; |
1930 | ||
1931 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1932 | hostdata->madapter_info.srp_version); | |
1933 | return len; | |
1934 | } | |
1935 | ||
ee959b00 | 1936 | static struct device_attribute ibmvscsi_host_srp_version = { |
1da177e4 LT |
1937 | .attr = { |
1938 | .name = "srp_version", | |
1939 | .mode = S_IRUGO, | |
1940 | }, | |
1941 | .show = show_host_srp_version, | |
1942 | }; | |
1943 | ||
ee959b00 TJ |
1944 | static ssize_t show_host_partition_name(struct device *dev, |
1945 | struct device_attribute *attr, | |
1da177e4 LT |
1946 | char *buf) |
1947 | { | |
ee959b00 | 1948 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1949 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1950 | int len; |
1951 | ||
1952 | len = snprintf(buf, PAGE_SIZE, "%s\n", | |
1953 | hostdata->madapter_info.partition_name); | |
1954 | return len; | |
1955 | } | |
1956 | ||
ee959b00 | 1957 | static struct device_attribute ibmvscsi_host_partition_name = { |
1da177e4 LT |
1958 | .attr = { |
1959 | .name = "partition_name", | |
1960 | .mode = S_IRUGO, | |
1961 | }, | |
1962 | .show = show_host_partition_name, | |
1963 | }; | |
1964 | ||
ee959b00 TJ |
1965 | static ssize_t show_host_partition_number(struct device *dev, |
1966 | struct device_attribute *attr, | |
1da177e4 LT |
1967 | char *buf) |
1968 | { | |
ee959b00 | 1969 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1970 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1971 | int len; |
1972 | ||
1973 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
f36948cb | 1974 | be32_to_cpu(hostdata->madapter_info.partition_number)); |
1da177e4 LT |
1975 | return len; |
1976 | } | |
1977 | ||
ee959b00 | 1978 | static struct device_attribute ibmvscsi_host_partition_number = { |
1da177e4 LT |
1979 | .attr = { |
1980 | .name = "partition_number", | |
1981 | .mode = S_IRUGO, | |
1982 | }, | |
1983 | .show = show_host_partition_number, | |
1984 | }; | |
1985 | ||
ee959b00 TJ |
1986 | static ssize_t show_host_mad_version(struct device *dev, |
1987 | struct device_attribute *attr, char *buf) | |
1da177e4 | 1988 | { |
ee959b00 | 1989 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 1990 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
1991 | int len; |
1992 | ||
1993 | len = snprintf(buf, PAGE_SIZE, "%d\n", | |
f36948cb | 1994 | be32_to_cpu(hostdata->madapter_info.mad_version)); |
1da177e4 LT |
1995 | return len; |
1996 | } | |
1997 | ||
ee959b00 | 1998 | static struct device_attribute ibmvscsi_host_mad_version = { |
1da177e4 LT |
1999 | .attr = { |
2000 | .name = "mad_version", | |
2001 | .mode = S_IRUGO, | |
2002 | }, | |
2003 | .show = show_host_mad_version, | |
2004 | }; | |
2005 | ||
ee959b00 TJ |
2006 | static ssize_t show_host_os_type(struct device *dev, |
2007 | struct device_attribute *attr, char *buf) | |
1da177e4 | 2008 | { |
ee959b00 | 2009 | struct Scsi_Host *shost = class_to_shost(dev); |
7603e02e | 2010 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); |
1da177e4 LT |
2011 | int len; |
2012 | ||
f36948cb TD |
2013 | len = snprintf(buf, PAGE_SIZE, "%d\n", |
2014 | be32_to_cpu(hostdata->madapter_info.os_type)); | |
1da177e4 LT |
2015 | return len; |
2016 | } | |
2017 | ||
ee959b00 | 2018 | static struct device_attribute ibmvscsi_host_os_type = { |
1da177e4 LT |
2019 | .attr = { |
2020 | .name = "os_type", | |
2021 | .mode = S_IRUGO, | |
2022 | }, | |
2023 | .show = show_host_os_type, | |
2024 | }; | |
2025 | ||
ee959b00 TJ |
2026 | static ssize_t show_host_config(struct device *dev, |
2027 | struct device_attribute *attr, char *buf) | |
1da177e4 | 2028 | { |
0a1c0ebf | 2029 | return 0; |
1da177e4 LT |
2030 | } |
2031 | ||
ee959b00 | 2032 | static struct device_attribute ibmvscsi_host_config = { |
1da177e4 | 2033 | .attr = { |
0a1c0ebf TD |
2034 | .name = "config", |
2035 | .mode = S_IRUGO, | |
2036 | }, | |
1da177e4 LT |
2037 | .show = show_host_config, |
2038 | }; | |
2039 | ||
2e225204 TD |
2040 | static int ibmvscsi_host_reset(struct Scsi_Host *shost, int reset_type) |
2041 | { | |
2042 | struct ibmvscsi_host_data *hostdata = shost_priv(shost); | |
2043 | ||
2044 | dev_info(hostdata->dev, "Initiating adapter reset!\n"); | |
2045 | ibmvscsi_reset_host(hostdata); | |
2046 | ||
2047 | return 0; | |
2048 | } | |
2049 | ||
ee959b00 | 2050 | static struct device_attribute *ibmvscsi_attrs[] = { |
126c5cc3 BK |
2051 | &ibmvscsi_host_vhost_loc, |
2052 | &ibmvscsi_host_vhost_name, | |
1da177e4 LT |
2053 | &ibmvscsi_host_srp_version, |
2054 | &ibmvscsi_host_partition_name, | |
2055 | &ibmvscsi_host_partition_number, | |
2056 | &ibmvscsi_host_mad_version, | |
2057 | &ibmvscsi_host_os_type, | |
2058 | &ibmvscsi_host_config, | |
2059 | NULL | |
2060 | }; | |
2061 | ||
2062 | /* ------------------------------------------------------------ | |
2063 | * SCSI driver registration | |
2064 | */ | |
2065 | static struct scsi_host_template driver_template = { | |
2066 | .module = THIS_MODULE, | |
2067 | .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION, | |
2068 | .proc_name = "ibmvscsi", | |
2069 | .queuecommand = ibmvscsi_queuecommand, | |
b6a05c82 | 2070 | .eh_timed_out = srp_timed_out, |
1da177e4 LT |
2071 | .eh_abort_handler = ibmvscsi_eh_abort_handler, |
2072 | .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler, | |
3d0e91f7 | 2073 | .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler, |
0979c84b | 2074 | .slave_configure = ibmvscsi_slave_configure, |
742d25b8 | 2075 | .change_queue_depth = ibmvscsi_change_queue_depth, |
2e225204 | 2076 | .host_reset = ibmvscsi_host_reset, |
7912a0ac | 2077 | .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT, |
a897ff2a | 2078 | .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT, |
1da177e4 | 2079 | .this_id = -1, |
4dddbc26 | 2080 | .sg_tablesize = SG_ALL, |
1da177e4 LT |
2081 | .shost_attrs = ibmvscsi_attrs, |
2082 | }; | |
2083 | ||
7912a0ac RJ |
2084 | /** |
2085 | * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver | |
2086 | * | |
2087 | * @vdev: struct vio_dev for the device whose desired IO mem is to be returned | |
2088 | * | |
2089 | * Return value: | |
2090 | * Number of bytes of IO data the driver will need to perform well. | |
2091 | */ | |
2092 | static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev) | |
2093 | { | |
2094 | /* iu_storage data allocated in initialize_event_pool */ | |
4f10aae0 | 2095 | unsigned long desired_io = max_events * sizeof(union viosrp_iu); |
7912a0ac RJ |
2096 | |
2097 | /* add io space for sg data */ | |
004dd5e8 | 2098 | desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 * |
7912a0ac RJ |
2099 | IBMVSCSI_CMDS_PER_LUN_DEFAULT); |
2100 | ||
2101 | return desired_io; | |
2102 | } | |
2103 | ||
0f33ece5 BK |
2104 | static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata) |
2105 | { | |
6e40de8b | 2106 | unsigned long flags; |
0f33ece5 BK |
2107 | int rc; |
2108 | char *action = "reset"; | |
2109 | ||
6e40de8b TD |
2110 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
2111 | switch (hostdata->action) { | |
aa343c69 | 2112 | case IBMVSCSI_HOST_ACTION_UNBLOCK: |
961ed94e | 2113 | rc = 0; |
6e40de8b TD |
2114 | break; |
2115 | case IBMVSCSI_HOST_ACTION_RESET: | |
2116 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
9965c2f1 | 2117 | rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata); |
6e40de8b | 2118 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
0f33ece5 | 2119 | if (!rc) |
9965c2f1 | 2120 | rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0); |
201aed67 | 2121 | vio_enable_interrupts(to_vio_dev(hostdata->dev)); |
6e40de8b TD |
2122 | break; |
2123 | case IBMVSCSI_HOST_ACTION_REENABLE: | |
0f33ece5 | 2124 | action = "enable"; |
6e40de8b | 2125 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
9965c2f1 | 2126 | rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata); |
6e40de8b | 2127 | spin_lock_irqsave(hostdata->host->host_lock, flags); |
0f33ece5 | 2128 | if (!rc) |
9965c2f1 | 2129 | rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0); |
6e40de8b | 2130 | break; |
961ed94e | 2131 | case IBMVSCSI_HOST_ACTION_NONE: |
6e40de8b | 2132 | default: |
961ed94e | 2133 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
0f33ece5 | 2134 | return; |
6e40de8b TD |
2135 | } |
2136 | ||
2137 | hostdata->action = IBMVSCSI_HOST_ACTION_NONE; | |
0f33ece5 BK |
2138 | |
2139 | if (rc) { | |
2140 | atomic_set(&hostdata->request_limit, -1); | |
2141 | dev_err(hostdata->dev, "error after %s\n", action); | |
2142 | } | |
6e40de8b | 2143 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); |
0f33ece5 BK |
2144 | |
2145 | scsi_unblock_requests(hostdata->host); | |
2146 | } | |
2147 | ||
6e40de8b | 2148 | static int __ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata) |
0f33ece5 BK |
2149 | { |
2150 | if (kthread_should_stop()) | |
2151 | return 1; | |
6e40de8b TD |
2152 | switch (hostdata->action) { |
2153 | case IBMVSCSI_HOST_ACTION_NONE: | |
2154 | return 0; | |
2155 | case IBMVSCSI_HOST_ACTION_RESET: | |
2156 | case IBMVSCSI_HOST_ACTION_REENABLE: | |
aa343c69 | 2157 | case IBMVSCSI_HOST_ACTION_UNBLOCK: |
6e40de8b TD |
2158 | default: |
2159 | break; | |
0f33ece5 BK |
2160 | } |
2161 | ||
6e40de8b TD |
2162 | return 1; |
2163 | } | |
2164 | ||
2165 | static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata) | |
2166 | { | |
2167 | unsigned long flags; | |
2168 | int rc; | |
2169 | ||
2170 | spin_lock_irqsave(hostdata->host->host_lock, flags); | |
2171 | rc = __ibmvscsi_work_to_do(hostdata); | |
2172 | spin_unlock_irqrestore(hostdata->host->host_lock, flags); | |
2173 | ||
2174 | return rc; | |
0f33ece5 BK |
2175 | } |
2176 | ||
2177 | static int ibmvscsi_work(void *data) | |
2178 | { | |
2179 | struct ibmvscsi_host_data *hostdata = data; | |
2180 | int rc; | |
2181 | ||
8698a745 | 2182 | set_user_nice(current, MIN_NICE); |
0f33ece5 BK |
2183 | |
2184 | while (1) { | |
2185 | rc = wait_event_interruptible(hostdata->work_wait_q, | |
2186 | ibmvscsi_work_to_do(hostdata)); | |
2187 | ||
2188 | BUG_ON(rc); | |
2189 | ||
2190 | if (kthread_should_stop()) | |
2191 | break; | |
2192 | ||
2193 | ibmvscsi_do_work(hostdata); | |
2194 | } | |
2195 | ||
2196 | return 0; | |
2197 | } | |
2198 | ||
1da177e4 LT |
2199 | /** |
2200 | * Called by bus code for each adapter | |
2201 | */ | |
2202 | static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) | |
2203 | { | |
2204 | struct ibmvscsi_host_data *hostdata; | |
2205 | struct Scsi_Host *host; | |
2206 | struct device *dev = &vdev->dev; | |
4d680419 FT |
2207 | struct srp_rport_identifiers ids; |
2208 | struct srp_rport *rport; | |
1da177e4 | 2209 | unsigned long wait_switch = 0; |
cefbda2d | 2210 | int rc; |
1da177e4 | 2211 | |
559fde70 | 2212 | dev_set_drvdata(&vdev->dev, NULL); |
1da177e4 LT |
2213 | |
2214 | host = scsi_host_alloc(&driver_template, sizeof(*hostdata)); | |
2215 | if (!host) { | |
6c0a60ec | 2216 | dev_err(&vdev->dev, "couldn't allocate host data\n"); |
1da177e4 LT |
2217 | goto scsi_host_alloc_failed; |
2218 | } | |
2219 | ||
4d680419 | 2220 | host->transportt = ibmvscsi_transport_template; |
7603e02e | 2221 | hostdata = shost_priv(host); |
1da177e4 LT |
2222 | memset(hostdata, 0x00, sizeof(*hostdata)); |
2223 | INIT_LIST_HEAD(&hostdata->sent); | |
0f33ece5 | 2224 | init_waitqueue_head(&hostdata->work_wait_q); |
1da177e4 LT |
2225 | hostdata->host = host; |
2226 | hostdata->dev = dev; | |
2227 | atomic_set(&hostdata->request_limit, -1); | |
7912a0ac | 2228 | hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT; |
1da177e4 | 2229 | |
126c5cc3 BK |
2230 | if (map_persist_bufs(hostdata)) { |
2231 | dev_err(&vdev->dev, "couldn't map persistent buffers\n"); | |
2232 | goto persist_bufs_failed; | |
2233 | } | |
2234 | ||
0f33ece5 BK |
2235 | hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d", |
2236 | "ibmvscsi", host->host_no); | |
2237 | ||
2238 | if (IS_ERR(hostdata->work_thread)) { | |
2239 | dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n", | |
2240 | PTR_ERR(hostdata->work_thread)); | |
2241 | goto init_crq_failed; | |
2242 | } | |
2243 | ||
9965c2f1 | 2244 | rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_events); |
cefbda2d | 2245 | if (rc != 0 && rc != H_RESOURCE) { |
6c0a60ec | 2246 | dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc); |
0f33ece5 | 2247 | goto kill_kthread; |
1da177e4 | 2248 | } |
4f10aae0 | 2249 | if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) { |
6c0a60ec | 2250 | dev_err(&vdev->dev, "couldn't initialize event pool\n"); |
1da177e4 LT |
2251 | goto init_pool_failed; |
2252 | } | |
2253 | ||
3467a146 | 2254 | host->max_lun = IBMVSCSI_MAX_LUN; |
1da177e4 LT |
2255 | host->max_id = max_id; |
2256 | host->max_channel = max_channel; | |
fbc56f08 | 2257 | host->max_cmd_len = 16; |
1da177e4 | 2258 | |
e3678a0c LV |
2259 | dev_info(dev, |
2260 | "Maximum ID: %d Maximum LUN: %llu Maximum Channel: %d\n", | |
2261 | host->max_id, host->max_lun, host->max_channel); | |
2262 | ||
1da177e4 LT |
2263 | if (scsi_add_host(hostdata->host, hostdata->dev)) |
2264 | goto add_host_failed; | |
2265 | ||
4d680419 FT |
2266 | /* we don't have a proper target_port_id so let's use the fake one */ |
2267 | memcpy(ids.port_id, hostdata->madapter_info.partition_name, | |
2268 | sizeof(ids.port_id)); | |
aebd5e47 | 2269 | ids.roles = SRP_RPORT_ROLE_TARGET; |
4d680419 FT |
2270 | rport = srp_rport_add(host, &ids); |
2271 | if (IS_ERR(rport)) | |
2272 | goto add_srp_port_failed; | |
2273 | ||
1da177e4 LT |
2274 | /* Try to send an initialization message. Note that this is allowed |
2275 | * to fail if the other end is not acive. In that case we don't | |
2276 | * want to scan | |
2277 | */ | |
9965c2f1 | 2278 | if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0 |
cefbda2d | 2279 | || rc == H_RESOURCE) { |
1da177e4 LT |
2280 | /* |
2281 | * Wait around max init_timeout secs for the adapter to finish | |
2282 | * initializing. When we are done initializing, we will have a | |
2283 | * valid request_limit. We don't want Linux scanning before | |
2284 | * we are ready. | |
2285 | */ | |
2286 | for (wait_switch = jiffies + (init_timeout * HZ); | |
2287 | time_before(jiffies, wait_switch) && | |
2288 | atomic_read(&hostdata->request_limit) < 2;) { | |
2289 | ||
2290 | msleep(10); | |
2291 | } | |
2292 | ||
2293 | /* if we now have a valid request_limit, initiate a scan */ | |
2294 | if (atomic_read(&hostdata->request_limit) > 0) | |
2295 | scsi_scan_host(host); | |
2296 | } | |
2297 | ||
559fde70 | 2298 | dev_set_drvdata(&vdev->dev, hostdata); |
7205981e | 2299 | spin_lock(&ibmvscsi_driver_lock); |
32d6e4b6 | 2300 | list_add_tail(&hostdata->host_list, &ibmvscsi_head); |
7205981e | 2301 | spin_unlock(&ibmvscsi_driver_lock); |
1da177e4 LT |
2302 | return 0; |
2303 | ||
4d680419 FT |
2304 | add_srp_port_failed: |
2305 | scsi_remove_host(hostdata->host); | |
1da177e4 LT |
2306 | add_host_failed: |
2307 | release_event_pool(&hostdata->pool, hostdata); | |
2308 | init_pool_failed: | |
9965c2f1 | 2309 | ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events); |
0f33ece5 BK |
2310 | kill_kthread: |
2311 | kthread_stop(hostdata->work_thread); | |
1da177e4 | 2312 | init_crq_failed: |
126c5cc3 BK |
2313 | unmap_persist_bufs(hostdata); |
2314 | persist_bufs_failed: | |
1da177e4 LT |
2315 | scsi_host_put(host); |
2316 | scsi_host_alloc_failed: | |
2317 | return -1; | |
2318 | } | |
2319 | ||
2320 | static int ibmvscsi_remove(struct vio_dev *vdev) | |
2321 | { | |
559fde70 | 2322 | struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev); |
7f5203c1 TD |
2323 | |
2324 | srp_remove_host(hostdata->host); | |
2325 | scsi_remove_host(hostdata->host); | |
2326 | ||
2327 | purge_requests(hostdata, DID_ERROR); | |
1da177e4 | 2328 | release_event_pool(&hostdata->pool, hostdata); |
7f5203c1 | 2329 | |
9965c2f1 | 2330 | ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, |
4f10aae0 | 2331 | max_events); |
4d680419 | 2332 | |
0f33ece5 | 2333 | kthread_stop(hostdata->work_thread); |
7f5203c1 TD |
2334 | unmap_persist_bufs(hostdata); |
2335 | ||
2336 | spin_lock(&ibmvscsi_driver_lock); | |
2337 | list_del(&hostdata->host_list); | |
2338 | spin_unlock(&ibmvscsi_driver_lock); | |
2339 | ||
1da177e4 LT |
2340 | scsi_host_put(hostdata->host); |
2341 | ||
2342 | return 0; | |
2343 | } | |
2344 | ||
64355b92 BK |
2345 | /** |
2346 | * ibmvscsi_resume: Resume from suspend | |
2347 | * @dev: device struct | |
2348 | * | |
2349 | * We may have lost an interrupt across suspend/resume, so kick the | |
2350 | * interrupt handler | |
2351 | */ | |
2352 | static int ibmvscsi_resume(struct device *dev) | |
2353 | { | |
2354 | struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev); | |
9965c2f1 BH |
2355 | vio_disable_interrupts(to_vio_dev(hostdata->dev)); |
2356 | tasklet_schedule(&hostdata->srp_task); | |
2357 | ||
2358 | return 0; | |
64355b92 BK |
2359 | } |
2360 | ||
1da177e4 LT |
2361 | /** |
2362 | * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we | |
2363 | * support. | |
2364 | */ | |
e4df3eaa | 2365 | static const struct vio_device_id ibmvscsi_device_table[] = { |
1da177e4 | 2366 | {"vscsi", "IBM,v-scsi"}, |
fb120da6 | 2367 | { "", "" } |
1da177e4 | 2368 | }; |
1da177e4 | 2369 | MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table); |
915124d8 | 2370 | |
e6b53a75 | 2371 | static const struct dev_pm_ops ibmvscsi_pm_ops = { |
64355b92 BK |
2372 | .resume = ibmvscsi_resume |
2373 | }; | |
2374 | ||
1da177e4 | 2375 | static struct vio_driver ibmvscsi_driver = { |
1da177e4 LT |
2376 | .id_table = ibmvscsi_device_table, |
2377 | .probe = ibmvscsi_probe, | |
6fdf5392 | 2378 | .remove = ibmvscsi_remove, |
7912a0ac | 2379 | .get_desired_dma = ibmvscsi_get_desired_dma, |
cb52d897 BH |
2380 | .name = "ibmvscsi", |
2381 | .pm = &ibmvscsi_pm_ops, | |
1da177e4 LT |
2382 | }; |
2383 | ||
4d680419 FT |
2384 | static struct srp_function_template ibmvscsi_transport_functions = { |
2385 | }; | |
2386 | ||
1da177e4 LT |
2387 | int __init ibmvscsi_module_init(void) |
2388 | { | |
4d680419 FT |
2389 | int ret; |
2390 | ||
4f10aae0 BK |
2391 | /* Ensure we have two requests to do error recovery */ |
2392 | driver_template.can_queue = max_requests; | |
2393 | max_events = max_requests + 2; | |
2394 | ||
9965c2f1 | 2395 | if (!firmware_has_feature(FW_FEATURE_VIO)) |
d3849d51 DW |
2396 | return -ENODEV; |
2397 | ||
4d680419 FT |
2398 | ibmvscsi_transport_template = |
2399 | srp_attach_transport(&ibmvscsi_transport_functions); | |
2400 | if (!ibmvscsi_transport_template) | |
2401 | return -ENOMEM; | |
2402 | ||
2403 | ret = vio_register_driver(&ibmvscsi_driver); | |
2404 | if (ret) | |
2405 | srp_release_transport(ibmvscsi_transport_template); | |
2406 | return ret; | |
1da177e4 LT |
2407 | } |
2408 | ||
2409 | void __exit ibmvscsi_module_exit(void) | |
2410 | { | |
2411 | vio_unregister_driver(&ibmvscsi_driver); | |
4d680419 | 2412 | srp_release_transport(ibmvscsi_transport_template); |
1da177e4 LT |
2413 | } |
2414 | ||
2415 | module_init(ibmvscsi_module_init); | |
2416 | module_exit(ibmvscsi_module_exit); |