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Commit | Line | Data |
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ab519a01 NF |
1 | /* |
2 | * Support for dynamic reconfiguration for PCI, Memory, and CPU | |
3 | * Hotplug and Dynamic Logical Partitioning on RPA platforms. | |
4 | * | |
5 | * Copyright (C) 2009 Nathan Fontenot | |
6 | * Copyright (C) 2009 IBM Corporation | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License version | |
10 | * 2 as published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/kref.h> | |
15 | #include <linux/notifier.h> | |
16 | #include <linux/proc_fs.h> | |
17 | #include <linux/spinlock.h> | |
18 | #include <linux/cpu.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
b6db63d1 | 20 | #include "offline_states.h" |
ab519a01 NF |
21 | |
22 | #include <asm/prom.h> | |
23 | #include <asm/machdep.h> | |
24 | #include <asm/uaccess.h> | |
25 | #include <asm/rtas.h> | |
26 | #include <asm/pSeries_reconfig.h> | |
27 | ||
28 | struct cc_workarea { | |
29 | u32 drc_index; | |
30 | u32 zero; | |
31 | u32 name_offset; | |
32 | u32 prop_length; | |
33 | u32 prop_offset; | |
34 | }; | |
35 | ||
20648974 | 36 | void dlpar_free_cc_property(struct property *prop) |
ab519a01 NF |
37 | { |
38 | kfree(prop->name); | |
39 | kfree(prop->value); | |
40 | kfree(prop); | |
41 | } | |
42 | ||
43 | static struct property *dlpar_parse_cc_property(struct cc_workarea *ccwa) | |
44 | { | |
45 | struct property *prop; | |
46 | char *name; | |
47 | char *value; | |
48 | ||
49 | prop = kzalloc(sizeof(*prop), GFP_KERNEL); | |
50 | if (!prop) | |
51 | return NULL; | |
52 | ||
53 | name = (char *)ccwa + ccwa->name_offset; | |
54 | prop->name = kstrdup(name, GFP_KERNEL); | |
55 | ||
56 | prop->length = ccwa->prop_length; | |
57 | value = (char *)ccwa + ccwa->prop_offset; | |
e72ed6b5 | 58 | prop->value = kmemdup(value, prop->length, GFP_KERNEL); |
ab519a01 NF |
59 | if (!prop->value) { |
60 | dlpar_free_cc_property(prop); | |
61 | return NULL; | |
62 | } | |
63 | ||
ab519a01 NF |
64 | return prop; |
65 | } | |
66 | ||
67 | static struct device_node *dlpar_parse_cc_node(struct cc_workarea *ccwa) | |
68 | { | |
69 | struct device_node *dn; | |
70 | char *name; | |
71 | ||
72 | dn = kzalloc(sizeof(*dn), GFP_KERNEL); | |
73 | if (!dn) | |
74 | return NULL; | |
75 | ||
76 | /* The configure connector reported name does not contain a | |
25985edc | 77 | * preceding '/', so we allocate a buffer large enough to |
ab519a01 NF |
78 | * prepend this to the full_name. |
79 | */ | |
80 | name = (char *)ccwa + ccwa->name_offset; | |
43caa61f | 81 | dn->full_name = kasprintf(GFP_KERNEL, "/%s", name); |
ab519a01 NF |
82 | if (!dn->full_name) { |
83 | kfree(dn); | |
84 | return NULL; | |
85 | } | |
86 | ||
ab519a01 NF |
87 | return dn; |
88 | } | |
89 | ||
90 | static void dlpar_free_one_cc_node(struct device_node *dn) | |
91 | { | |
92 | struct property *prop; | |
93 | ||
94 | while (dn->properties) { | |
95 | prop = dn->properties; | |
96 | dn->properties = prop->next; | |
97 | dlpar_free_cc_property(prop); | |
98 | } | |
99 | ||
100 | kfree(dn->full_name); | |
101 | kfree(dn); | |
102 | } | |
103 | ||
20648974 | 104 | void dlpar_free_cc_nodes(struct device_node *dn) |
ab519a01 NF |
105 | { |
106 | if (dn->child) | |
107 | dlpar_free_cc_nodes(dn->child); | |
108 | ||
109 | if (dn->sibling) | |
110 | dlpar_free_cc_nodes(dn->sibling); | |
111 | ||
112 | dlpar_free_one_cc_node(dn); | |
113 | } | |
114 | ||
115 | #define NEXT_SIBLING 1 | |
116 | #define NEXT_CHILD 2 | |
117 | #define NEXT_PROPERTY 3 | |
118 | #define PREV_PARENT 4 | |
119 | #define MORE_MEMORY 5 | |
120 | #define CALL_AGAIN -2 | |
121 | #define ERR_CFG_USE -9003 | |
122 | ||
123 | struct device_node *dlpar_configure_connector(u32 drc_index) | |
124 | { | |
125 | struct device_node *dn; | |
126 | struct device_node *first_dn = NULL; | |
127 | struct device_node *last_dn = NULL; | |
128 | struct property *property; | |
129 | struct property *last_property = NULL; | |
130 | struct cc_workarea *ccwa; | |
93f68f1e | 131 | char *data_buf; |
ab519a01 | 132 | int cc_token; |
93f68f1e | 133 | int rc = -1; |
ab519a01 NF |
134 | |
135 | cc_token = rtas_token("ibm,configure-connector"); | |
136 | if (cc_token == RTAS_UNKNOWN_SERVICE) | |
137 | return NULL; | |
138 | ||
93f68f1e NF |
139 | data_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL); |
140 | if (!data_buf) | |
141 | return NULL; | |
142 | ||
143 | ccwa = (struct cc_workarea *)&data_buf[0]; | |
ab519a01 NF |
144 | ccwa->drc_index = drc_index; |
145 | ccwa->zero = 0; | |
146 | ||
93f68f1e NF |
147 | do { |
148 | /* Since we release the rtas_data_buf lock between configure | |
149 | * connector calls we want to re-populate the rtas_data_buffer | |
150 | * with the contents of the previous call. | |
151 | */ | |
152 | spin_lock(&rtas_data_buf_lock); | |
153 | ||
154 | memcpy(rtas_data_buf, data_buf, RTAS_DATA_BUF_SIZE); | |
155 | rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL); | |
156 | memcpy(data_buf, rtas_data_buf, RTAS_DATA_BUF_SIZE); | |
157 | ||
158 | spin_unlock(&rtas_data_buf_lock); | |
159 | ||
ab519a01 NF |
160 | switch (rc) { |
161 | case NEXT_SIBLING: | |
162 | dn = dlpar_parse_cc_node(ccwa); | |
163 | if (!dn) | |
164 | goto cc_error; | |
165 | ||
166 | dn->parent = last_dn->parent; | |
167 | last_dn->sibling = dn; | |
168 | last_dn = dn; | |
169 | break; | |
170 | ||
171 | case NEXT_CHILD: | |
172 | dn = dlpar_parse_cc_node(ccwa); | |
173 | if (!dn) | |
174 | goto cc_error; | |
175 | ||
176 | if (!first_dn) | |
177 | first_dn = dn; | |
178 | else { | |
179 | dn->parent = last_dn; | |
180 | if (last_dn) | |
181 | last_dn->child = dn; | |
182 | } | |
183 | ||
184 | last_dn = dn; | |
185 | break; | |
186 | ||
187 | case NEXT_PROPERTY: | |
188 | property = dlpar_parse_cc_property(ccwa); | |
189 | if (!property) | |
190 | goto cc_error; | |
191 | ||
192 | if (!last_dn->properties) | |
193 | last_dn->properties = property; | |
194 | else | |
195 | last_property->next = property; | |
196 | ||
197 | last_property = property; | |
198 | break; | |
199 | ||
200 | case PREV_PARENT: | |
201 | last_dn = last_dn->parent; | |
202 | break; | |
203 | ||
204 | case CALL_AGAIN: | |
205 | break; | |
206 | ||
207 | case MORE_MEMORY: | |
208 | case ERR_CFG_USE: | |
209 | default: | |
210 | printk(KERN_ERR "Unexpected Error (%d) " | |
211 | "returned from configure-connector\n", rc); | |
212 | goto cc_error; | |
213 | } | |
93f68f1e | 214 | } while (rc); |
ab519a01 | 215 | |
93f68f1e NF |
216 | cc_error: |
217 | kfree(data_buf); | |
218 | ||
219 | if (rc) { | |
220 | if (first_dn) | |
221 | dlpar_free_cc_nodes(first_dn); | |
222 | ||
223 | return NULL; | |
ab519a01 NF |
224 | } |
225 | ||
ab519a01 | 226 | return first_dn; |
ab519a01 NF |
227 | } |
228 | ||
229 | static struct device_node *derive_parent(const char *path) | |
230 | { | |
231 | struct device_node *parent; | |
232 | char *last_slash; | |
233 | ||
234 | last_slash = strrchr(path, '/'); | |
235 | if (last_slash == path) { | |
236 | parent = of_find_node_by_path("/"); | |
237 | } else { | |
238 | char *parent_path; | |
239 | int parent_path_len = last_slash - path + 1; | |
240 | parent_path = kmalloc(parent_path_len, GFP_KERNEL); | |
241 | if (!parent_path) | |
242 | return NULL; | |
243 | ||
244 | strlcpy(parent_path, path, parent_path_len); | |
245 | parent = of_find_node_by_path(parent_path); | |
246 | kfree(parent_path); | |
247 | } | |
248 | ||
249 | return parent; | |
250 | } | |
251 | ||
252 | int dlpar_attach_node(struct device_node *dn) | |
253 | { | |
46150a05 | 254 | #ifdef CONFIG_PROC_DEVICETREE |
ab519a01 | 255 | struct proc_dir_entry *ent; |
46150a05 | 256 | #endif |
ab519a01 NF |
257 | int rc; |
258 | ||
259 | of_node_set_flag(dn, OF_DYNAMIC); | |
260 | kref_init(&dn->kref); | |
261 | dn->parent = derive_parent(dn->full_name); | |
262 | if (!dn->parent) | |
263 | return -ENOMEM; | |
264 | ||
265 | rc = blocking_notifier_call_chain(&pSeries_reconfig_chain, | |
266 | PSERIES_RECONFIG_ADD, dn); | |
267 | if (rc == NOTIFY_BAD) { | |
268 | printk(KERN_ERR "Failed to add device node %s\n", | |
269 | dn->full_name); | |
270 | return -ENOMEM; /* For now, safe to assume kmalloc failure */ | |
271 | } | |
272 | ||
273 | of_attach_node(dn); | |
274 | ||
275 | #ifdef CONFIG_PROC_DEVICETREE | |
276 | ent = proc_mkdir(strrchr(dn->full_name, '/') + 1, dn->parent->pde); | |
277 | if (ent) | |
278 | proc_device_tree_add_node(dn, ent); | |
279 | #endif | |
280 | ||
281 | of_node_put(dn->parent); | |
282 | return 0; | |
283 | } | |
284 | ||
285 | int dlpar_detach_node(struct device_node *dn) | |
286 | { | |
46150a05 | 287 | #ifdef CONFIG_PROC_DEVICETREE |
ab519a01 NF |
288 | struct device_node *parent = dn->parent; |
289 | struct property *prop = dn->properties; | |
290 | ||
ab519a01 NF |
291 | while (prop) { |
292 | remove_proc_entry(prop->name, dn->pde); | |
293 | prop = prop->next; | |
294 | } | |
295 | ||
296 | if (dn->pde) | |
297 | remove_proc_entry(dn->pde->name, parent->pde); | |
298 | #endif | |
299 | ||
300 | blocking_notifier_call_chain(&pSeries_reconfig_chain, | |
301 | PSERIES_RECONFIG_REMOVE, dn); | |
302 | of_detach_node(dn); | |
303 | of_node_put(dn); /* Must decrement the refcount */ | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
308 | #define DR_ENTITY_SENSE 9003 | |
309 | #define DR_ENTITY_PRESENT 1 | |
310 | #define DR_ENTITY_UNUSABLE 2 | |
311 | #define ALLOCATION_STATE 9003 | |
312 | #define ALLOC_UNUSABLE 0 | |
313 | #define ALLOC_USABLE 1 | |
314 | #define ISOLATION_STATE 9001 | |
315 | #define ISOLATE 0 | |
316 | #define UNISOLATE 1 | |
317 | ||
318 | int dlpar_acquire_drc(u32 drc_index) | |
319 | { | |
320 | int dr_status, rc; | |
321 | ||
322 | rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status, | |
323 | DR_ENTITY_SENSE, drc_index); | |
324 | if (rc || dr_status != DR_ENTITY_UNUSABLE) | |
325 | return -1; | |
326 | ||
327 | rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_USABLE); | |
328 | if (rc) | |
329 | return rc; | |
330 | ||
331 | rc = rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE); | |
332 | if (rc) { | |
333 | rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE); | |
334 | return rc; | |
335 | } | |
336 | ||
337 | return 0; | |
338 | } | |
339 | ||
340 | int dlpar_release_drc(u32 drc_index) | |
341 | { | |
342 | int dr_status, rc; | |
343 | ||
344 | rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status, | |
345 | DR_ENTITY_SENSE, drc_index); | |
346 | if (rc || dr_status != DR_ENTITY_PRESENT) | |
347 | return -1; | |
348 | ||
349 | rc = rtas_set_indicator(ISOLATION_STATE, drc_index, ISOLATE); | |
350 | if (rc) | |
351 | return rc; | |
352 | ||
353 | rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE); | |
354 | if (rc) { | |
355 | rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE); | |
356 | return rc; | |
357 | } | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
1a8061c4 | 362 | #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE |
ab519a01 | 363 | |
275a64f6 NF |
364 | static int dlpar_online_cpu(struct device_node *dn) |
365 | { | |
366 | int rc = 0; | |
367 | unsigned int cpu; | |
368 | int len, nthreads, i; | |
369 | const u32 *intserv; | |
370 | ||
371 | intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len); | |
372 | if (!intserv) | |
373 | return -EINVAL; | |
374 | ||
375 | nthreads = len / sizeof(u32); | |
376 | ||
377 | cpu_maps_update_begin(); | |
378 | for (i = 0; i < nthreads; i++) { | |
379 | for_each_present_cpu(cpu) { | |
380 | if (get_hard_smp_processor_id(cpu) != intserv[i]) | |
381 | continue; | |
382 | BUG_ON(get_cpu_current_state(cpu) | |
383 | != CPU_STATE_OFFLINE); | |
384 | cpu_maps_update_done(); | |
385 | rc = cpu_up(cpu); | |
386 | if (rc) | |
387 | goto out; | |
388 | cpu_maps_update_begin(); | |
389 | ||
390 | break; | |
391 | } | |
392 | if (cpu == num_possible_cpus()) | |
393 | printk(KERN_WARNING "Could not find cpu to online " | |
394 | "with physical id 0x%x\n", intserv[i]); | |
395 | } | |
396 | cpu_maps_update_done(); | |
397 | ||
398 | out: | |
399 | return rc; | |
400 | ||
401 | } | |
402 | ||
1a8061c4 NF |
403 | static ssize_t dlpar_cpu_probe(const char *buf, size_t count) |
404 | { | |
405 | struct device_node *dn; | |
406 | unsigned long drc_index; | |
407 | char *cpu_name; | |
408 | int rc; | |
409 | ||
51badebd | 410 | cpu_hotplug_driver_lock(); |
1a8061c4 | 411 | rc = strict_strtoul(buf, 0, &drc_index); |
51badebd GS |
412 | if (rc) { |
413 | rc = -EINVAL; | |
414 | goto out; | |
415 | } | |
1a8061c4 NF |
416 | |
417 | dn = dlpar_configure_connector(drc_index); | |
51badebd GS |
418 | if (!dn) { |
419 | rc = -EINVAL; | |
420 | goto out; | |
421 | } | |
1a8061c4 NF |
422 | |
423 | /* configure-connector reports cpus as living in the base | |
424 | * directory of the device tree. CPUs actually live in the | |
425 | * cpus directory so we need to fixup the full_name. | |
426 | */ | |
43caa61f | 427 | cpu_name = kasprintf(GFP_KERNEL, "/cpus%s", dn->full_name); |
1a8061c4 NF |
428 | if (!cpu_name) { |
429 | dlpar_free_cc_nodes(dn); | |
51badebd GS |
430 | rc = -ENOMEM; |
431 | goto out; | |
1a8061c4 NF |
432 | } |
433 | ||
1a8061c4 NF |
434 | kfree(dn->full_name); |
435 | dn->full_name = cpu_name; | |
436 | ||
437 | rc = dlpar_acquire_drc(drc_index); | |
438 | if (rc) { | |
439 | dlpar_free_cc_nodes(dn); | |
51badebd GS |
440 | rc = -EINVAL; |
441 | goto out; | |
1a8061c4 NF |
442 | } |
443 | ||
444 | rc = dlpar_attach_node(dn); | |
445 | if (rc) { | |
446 | dlpar_release_drc(drc_index); | |
447 | dlpar_free_cc_nodes(dn); | |
a7df5c5e | 448 | goto out; |
1a8061c4 NF |
449 | } |
450 | ||
275a64f6 | 451 | rc = dlpar_online_cpu(dn); |
51badebd GS |
452 | out: |
453 | cpu_hotplug_driver_unlock(); | |
b6db63d1 | 454 | |
1a8061c4 NF |
455 | return rc ? rc : count; |
456 | } | |
457 | ||
275a64f6 NF |
458 | static int dlpar_offline_cpu(struct device_node *dn) |
459 | { | |
460 | int rc = 0; | |
461 | unsigned int cpu; | |
462 | int len, nthreads, i; | |
463 | const u32 *intserv; | |
464 | ||
465 | intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len); | |
466 | if (!intserv) | |
467 | return -EINVAL; | |
468 | ||
469 | nthreads = len / sizeof(u32); | |
470 | ||
471 | cpu_maps_update_begin(); | |
472 | for (i = 0; i < nthreads; i++) { | |
473 | for_each_present_cpu(cpu) { | |
474 | if (get_hard_smp_processor_id(cpu) != intserv[i]) | |
475 | continue; | |
476 | ||
477 | if (get_cpu_current_state(cpu) == CPU_STATE_OFFLINE) | |
478 | break; | |
479 | ||
480 | if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) { | |
ceddee23 | 481 | set_preferred_offline_state(cpu, CPU_STATE_OFFLINE); |
275a64f6 NF |
482 | cpu_maps_update_done(); |
483 | rc = cpu_down(cpu); | |
484 | if (rc) | |
485 | goto out; | |
486 | cpu_maps_update_begin(); | |
487 | break; | |
488 | ||
489 | } | |
490 | ||
491 | /* | |
492 | * The cpu is in CPU_STATE_INACTIVE. | |
493 | * Upgrade it's state to CPU_STATE_OFFLINE. | |
494 | */ | |
495 | set_preferred_offline_state(cpu, CPU_STATE_OFFLINE); | |
496 | BUG_ON(plpar_hcall_norets(H_PROD, intserv[i]) | |
497 | != H_SUCCESS); | |
498 | __cpu_die(cpu); | |
499 | break; | |
500 | } | |
501 | if (cpu == num_possible_cpus()) | |
502 | printk(KERN_WARNING "Could not find cpu to offline " | |
503 | "with physical id 0x%x\n", intserv[i]); | |
504 | } | |
505 | cpu_maps_update_done(); | |
506 | ||
507 | out: | |
508 | return rc; | |
509 | ||
510 | } | |
511 | ||
1a8061c4 NF |
512 | static ssize_t dlpar_cpu_release(const char *buf, size_t count) |
513 | { | |
514 | struct device_node *dn; | |
515 | const u32 *drc_index; | |
516 | int rc; | |
517 | ||
518 | dn = of_find_node_by_path(buf); | |
519 | if (!dn) | |
520 | return -EINVAL; | |
521 | ||
522 | drc_index = of_get_property(dn, "ibm,my-drc-index", NULL); | |
523 | if (!drc_index) { | |
524 | of_node_put(dn); | |
525 | return -EINVAL; | |
526 | } | |
527 | ||
51badebd | 528 | cpu_hotplug_driver_lock(); |
275a64f6 | 529 | rc = dlpar_offline_cpu(dn); |
b6db63d1 GS |
530 | if (rc) { |
531 | of_node_put(dn); | |
51badebd GS |
532 | rc = -EINVAL; |
533 | goto out; | |
b6db63d1 GS |
534 | } |
535 | ||
1a8061c4 NF |
536 | rc = dlpar_release_drc(*drc_index); |
537 | if (rc) { | |
538 | of_node_put(dn); | |
51badebd | 539 | goto out; |
1a8061c4 NF |
540 | } |
541 | ||
542 | rc = dlpar_detach_node(dn); | |
543 | if (rc) { | |
544 | dlpar_acquire_drc(*drc_index); | |
51badebd | 545 | goto out; |
1a8061c4 NF |
546 | } |
547 | ||
548 | of_node_put(dn); | |
51badebd GS |
549 | out: |
550 | cpu_hotplug_driver_unlock(); | |
551 | return rc ? rc : count; | |
1a8061c4 NF |
552 | } |
553 | ||
554 | static int __init pseries_dlpar_init(void) | |
555 | { | |
556 | ppc_md.cpu_probe = dlpar_cpu_probe; | |
557 | ppc_md.cpu_release = dlpar_cpu_release; | |
558 | ||
559 | return 0; | |
560 | } | |
561 | machine_device_initcall(pseries, pseries_dlpar_init); | |
562 | ||
563 | #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */ |