diff options
Diffstat (limited to 'arch/powerpc/platforms/pseries/dlpar.c')
-rw-r--r-- | arch/powerpc/platforms/pseries/dlpar.c | 558 |
1 files changed, 558 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c new file mode 100644 index 000000000000..12df9e8812a9 --- /dev/null +++ b/arch/powerpc/platforms/pseries/dlpar.c | |||
@@ -0,0 +1,558 @@ | |||
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> | ||
19 | #include "offline_states.h" | ||
20 | |||
21 | #include <asm/prom.h> | ||
22 | #include <asm/machdep.h> | ||
23 | #include <asm/uaccess.h> | ||
24 | #include <asm/rtas.h> | ||
25 | #include <asm/pSeries_reconfig.h> | ||
26 | |||
27 | struct cc_workarea { | ||
28 | u32 drc_index; | ||
29 | u32 zero; | ||
30 | u32 name_offset; | ||
31 | u32 prop_length; | ||
32 | u32 prop_offset; | ||
33 | }; | ||
34 | |||
35 | static void dlpar_free_cc_property(struct property *prop) | ||
36 | { | ||
37 | kfree(prop->name); | ||
38 | kfree(prop->value); | ||
39 | kfree(prop); | ||
40 | } | ||
41 | |||
42 | static struct property *dlpar_parse_cc_property(struct cc_workarea *ccwa) | ||
43 | { | ||
44 | struct property *prop; | ||
45 | char *name; | ||
46 | char *value; | ||
47 | |||
48 | prop = kzalloc(sizeof(*prop), GFP_KERNEL); | ||
49 | if (!prop) | ||
50 | return NULL; | ||
51 | |||
52 | name = (char *)ccwa + ccwa->name_offset; | ||
53 | prop->name = kstrdup(name, GFP_KERNEL); | ||
54 | |||
55 | prop->length = ccwa->prop_length; | ||
56 | value = (char *)ccwa + ccwa->prop_offset; | ||
57 | prop->value = kzalloc(prop->length, GFP_KERNEL); | ||
58 | if (!prop->value) { | ||
59 | dlpar_free_cc_property(prop); | ||
60 | return NULL; | ||
61 | } | ||
62 | |||
63 | memcpy(prop->value, value, prop->length); | ||
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 | ||
77 | * preceeding '/', so we allocate a buffer large enough to | ||
78 | * prepend this to the full_name. | ||
79 | */ | ||
80 | name = (char *)ccwa + ccwa->name_offset; | ||
81 | dn->full_name = kmalloc(strlen(name) + 2, GFP_KERNEL); | ||
82 | if (!dn->full_name) { | ||
83 | kfree(dn); | ||
84 | return NULL; | ||
85 | } | ||
86 | |||
87 | sprintf(dn->full_name, "/%s", name); | ||
88 | return dn; | ||
89 | } | ||
90 | |||
91 | static void dlpar_free_one_cc_node(struct device_node *dn) | ||
92 | { | ||
93 | struct property *prop; | ||
94 | |||
95 | while (dn->properties) { | ||
96 | prop = dn->properties; | ||
97 | dn->properties = prop->next; | ||
98 | dlpar_free_cc_property(prop); | ||
99 | } | ||
100 | |||
101 | kfree(dn->full_name); | ||
102 | kfree(dn); | ||
103 | } | ||
104 | |||
105 | static void dlpar_free_cc_nodes(struct device_node *dn) | ||
106 | { | ||
107 | if (dn->child) | ||
108 | dlpar_free_cc_nodes(dn->child); | ||
109 | |||
110 | if (dn->sibling) | ||
111 | dlpar_free_cc_nodes(dn->sibling); | ||
112 | |||
113 | dlpar_free_one_cc_node(dn); | ||
114 | } | ||
115 | |||
116 | #define NEXT_SIBLING 1 | ||
117 | #define NEXT_CHILD 2 | ||
118 | #define NEXT_PROPERTY 3 | ||
119 | #define PREV_PARENT 4 | ||
120 | #define MORE_MEMORY 5 | ||
121 | #define CALL_AGAIN -2 | ||
122 | #define ERR_CFG_USE -9003 | ||
123 | |||
124 | struct device_node *dlpar_configure_connector(u32 drc_index) | ||
125 | { | ||
126 | struct device_node *dn; | ||
127 | struct device_node *first_dn = NULL; | ||
128 | struct device_node *last_dn = NULL; | ||
129 | struct property *property; | ||
130 | struct property *last_property = NULL; | ||
131 | struct cc_workarea *ccwa; | ||
132 | int cc_token; | ||
133 | int rc; | ||
134 | |||
135 | cc_token = rtas_token("ibm,configure-connector"); | ||
136 | if (cc_token == RTAS_UNKNOWN_SERVICE) | ||
137 | return NULL; | ||
138 | |||
139 | spin_lock(&rtas_data_buf_lock); | ||
140 | ccwa = (struct cc_workarea *)&rtas_data_buf[0]; | ||
141 | ccwa->drc_index = drc_index; | ||
142 | ccwa->zero = 0; | ||
143 | |||
144 | rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL); | ||
145 | while (rc) { | ||
146 | switch (rc) { | ||
147 | case NEXT_SIBLING: | ||
148 | dn = dlpar_parse_cc_node(ccwa); | ||
149 | if (!dn) | ||
150 | goto cc_error; | ||
151 | |||
152 | dn->parent = last_dn->parent; | ||
153 | last_dn->sibling = dn; | ||
154 | last_dn = dn; | ||
155 | break; | ||
156 | |||
157 | case NEXT_CHILD: | ||
158 | dn = dlpar_parse_cc_node(ccwa); | ||
159 | if (!dn) | ||
160 | goto cc_error; | ||
161 | |||
162 | if (!first_dn) | ||
163 | first_dn = dn; | ||
164 | else { | ||
165 | dn->parent = last_dn; | ||
166 | if (last_dn) | ||
167 | last_dn->child = dn; | ||
168 | } | ||
169 | |||
170 | last_dn = dn; | ||
171 | break; | ||
172 | |||
173 | case NEXT_PROPERTY: | ||
174 | property = dlpar_parse_cc_property(ccwa); | ||
175 | if (!property) | ||
176 | goto cc_error; | ||
177 | |||
178 | if (!last_dn->properties) | ||
179 | last_dn->properties = property; | ||
180 | else | ||
181 | last_property->next = property; | ||
182 | |||
183 | last_property = property; | ||
184 | break; | ||
185 | |||
186 | case PREV_PARENT: | ||
187 | last_dn = last_dn->parent; | ||
188 | break; | ||
189 | |||
190 | case CALL_AGAIN: | ||
191 | break; | ||
192 | |||
193 | case MORE_MEMORY: | ||
194 | case ERR_CFG_USE: | ||
195 | default: | ||
196 | printk(KERN_ERR "Unexpected Error (%d) " | ||
197 | "returned from configure-connector\n", rc); | ||
198 | goto cc_error; | ||
199 | } | ||
200 | |||
201 | rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL); | ||
202 | } | ||
203 | |||
204 | spin_unlock(&rtas_data_buf_lock); | ||
205 | return first_dn; | ||
206 | |||
207 | cc_error: | ||
208 | if (first_dn) | ||
209 | dlpar_free_cc_nodes(first_dn); | ||
210 | spin_unlock(&rtas_data_buf_lock); | ||
211 | return NULL; | ||
212 | } | ||
213 | |||
214 | static struct device_node *derive_parent(const char *path) | ||
215 | { | ||
216 | struct device_node *parent; | ||
217 | char *last_slash; | ||
218 | |||
219 | last_slash = strrchr(path, '/'); | ||
220 | if (last_slash == path) { | ||
221 | parent = of_find_node_by_path("/"); | ||
222 | } else { | ||
223 | char *parent_path; | ||
224 | int parent_path_len = last_slash - path + 1; | ||
225 | parent_path = kmalloc(parent_path_len, GFP_KERNEL); | ||
226 | if (!parent_path) | ||
227 | return NULL; | ||
228 | |||
229 | strlcpy(parent_path, path, parent_path_len); | ||
230 | parent = of_find_node_by_path(parent_path); | ||
231 | kfree(parent_path); | ||
232 | } | ||
233 | |||
234 | return parent; | ||
235 | } | ||
236 | |||
237 | int dlpar_attach_node(struct device_node *dn) | ||
238 | { | ||
239 | struct proc_dir_entry *ent; | ||
240 | int rc; | ||
241 | |||
242 | of_node_set_flag(dn, OF_DYNAMIC); | ||
243 | kref_init(&dn->kref); | ||
244 | dn->parent = derive_parent(dn->full_name); | ||
245 | if (!dn->parent) | ||
246 | return -ENOMEM; | ||
247 | |||
248 | rc = blocking_notifier_call_chain(&pSeries_reconfig_chain, | ||
249 | PSERIES_RECONFIG_ADD, dn); | ||
250 | if (rc == NOTIFY_BAD) { | ||
251 | printk(KERN_ERR "Failed to add device node %s\n", | ||
252 | dn->full_name); | ||
253 | return -ENOMEM; /* For now, safe to assume kmalloc failure */ | ||
254 | } | ||
255 | |||
256 | of_attach_node(dn); | ||
257 | |||
258 | #ifdef CONFIG_PROC_DEVICETREE | ||
259 | ent = proc_mkdir(strrchr(dn->full_name, '/') + 1, dn->parent->pde); | ||
260 | if (ent) | ||
261 | proc_device_tree_add_node(dn, ent); | ||
262 | #endif | ||
263 | |||
264 | of_node_put(dn->parent); | ||
265 | return 0; | ||
266 | } | ||
267 | |||
268 | int dlpar_detach_node(struct device_node *dn) | ||
269 | { | ||
270 | struct device_node *parent = dn->parent; | ||
271 | struct property *prop = dn->properties; | ||
272 | |||
273 | #ifdef CONFIG_PROC_DEVICETREE | ||
274 | while (prop) { | ||
275 | remove_proc_entry(prop->name, dn->pde); | ||
276 | prop = prop->next; | ||
277 | } | ||
278 | |||
279 | if (dn->pde) | ||
280 | remove_proc_entry(dn->pde->name, parent->pde); | ||
281 | #endif | ||
282 | |||
283 | blocking_notifier_call_chain(&pSeries_reconfig_chain, | ||
284 | PSERIES_RECONFIG_REMOVE, dn); | ||
285 | of_detach_node(dn); | ||
286 | of_node_put(dn); /* Must decrement the refcount */ | ||
287 | |||
288 | return 0; | ||
289 | } | ||
290 | |||
291 | #define DR_ENTITY_SENSE 9003 | ||
292 | #define DR_ENTITY_PRESENT 1 | ||
293 | #define DR_ENTITY_UNUSABLE 2 | ||
294 | #define ALLOCATION_STATE 9003 | ||
295 | #define ALLOC_UNUSABLE 0 | ||
296 | #define ALLOC_USABLE 1 | ||
297 | #define ISOLATION_STATE 9001 | ||
298 | #define ISOLATE 0 | ||
299 | #define UNISOLATE 1 | ||
300 | |||
301 | int dlpar_acquire_drc(u32 drc_index) | ||
302 | { | ||
303 | int dr_status, rc; | ||
304 | |||
305 | rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status, | ||
306 | DR_ENTITY_SENSE, drc_index); | ||
307 | if (rc || dr_status != DR_ENTITY_UNUSABLE) | ||
308 | return -1; | ||
309 | |||
310 | rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_USABLE); | ||
311 | if (rc) | ||
312 | return rc; | ||
313 | |||
314 | rc = rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE); | ||
315 | if (rc) { | ||
316 | rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE); | ||
317 | return rc; | ||
318 | } | ||
319 | |||
320 | return 0; | ||
321 | } | ||
322 | |||
323 | int dlpar_release_drc(u32 drc_index) | ||
324 | { | ||
325 | int dr_status, rc; | ||
326 | |||
327 | rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status, | ||
328 | DR_ENTITY_SENSE, drc_index); | ||
329 | if (rc || dr_status != DR_ENTITY_PRESENT) | ||
330 | return -1; | ||
331 | |||
332 | rc = rtas_set_indicator(ISOLATION_STATE, drc_index, ISOLATE); | ||
333 | if (rc) | ||
334 | return rc; | ||
335 | |||
336 | rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE); | ||
337 | if (rc) { | ||
338 | rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE); | ||
339 | return rc; | ||
340 | } | ||
341 | |||
342 | return 0; | ||
343 | } | ||
344 | |||
345 | #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE | ||
346 | |||
347 | static DEFINE_MUTEX(pseries_cpu_hotplug_mutex); | ||
348 | |||
349 | void cpu_hotplug_driver_lock() | ||
350 | { | ||
351 | mutex_lock(&pseries_cpu_hotplug_mutex); | ||
352 | } | ||
353 | |||
354 | void cpu_hotplug_driver_unlock() | ||
355 | { | ||
356 | mutex_unlock(&pseries_cpu_hotplug_mutex); | ||
357 | } | ||
358 | |||
359 | static int dlpar_online_cpu(struct device_node *dn) | ||
360 | { | ||
361 | int rc = 0; | ||
362 | unsigned int cpu; | ||
363 | int len, nthreads, i; | ||
364 | const u32 *intserv; | ||
365 | |||
366 | intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len); | ||
367 | if (!intserv) | ||
368 | return -EINVAL; | ||
369 | |||
370 | nthreads = len / sizeof(u32); | ||
371 | |||
372 | cpu_maps_update_begin(); | ||
373 | for (i = 0; i < nthreads; i++) { | ||
374 | for_each_present_cpu(cpu) { | ||
375 | if (get_hard_smp_processor_id(cpu) != intserv[i]) | ||
376 | continue; | ||
377 | BUG_ON(get_cpu_current_state(cpu) | ||
378 | != CPU_STATE_OFFLINE); | ||
379 | cpu_maps_update_done(); | ||
380 | rc = cpu_up(cpu); | ||
381 | if (rc) | ||
382 | goto out; | ||
383 | cpu_maps_update_begin(); | ||
384 | |||
385 | break; | ||
386 | } | ||
387 | if (cpu == num_possible_cpus()) | ||
388 | printk(KERN_WARNING "Could not find cpu to online " | ||
389 | "with physical id 0x%x\n", intserv[i]); | ||
390 | } | ||
391 | cpu_maps_update_done(); | ||
392 | |||
393 | out: | ||
394 | return rc; | ||
395 | |||
396 | } | ||
397 | |||
398 | static ssize_t dlpar_cpu_probe(const char *buf, size_t count) | ||
399 | { | ||
400 | struct device_node *dn; | ||
401 | unsigned long drc_index; | ||
402 | char *cpu_name; | ||
403 | int rc; | ||
404 | |||
405 | cpu_hotplug_driver_lock(); | ||
406 | rc = strict_strtoul(buf, 0, &drc_index); | ||
407 | if (rc) { | ||
408 | rc = -EINVAL; | ||
409 | goto out; | ||
410 | } | ||
411 | |||
412 | dn = dlpar_configure_connector(drc_index); | ||
413 | if (!dn) { | ||
414 | rc = -EINVAL; | ||
415 | goto out; | ||
416 | } | ||
417 | |||
418 | /* configure-connector reports cpus as living in the base | ||
419 | * directory of the device tree. CPUs actually live in the | ||
420 | * cpus directory so we need to fixup the full_name. | ||
421 | */ | ||
422 | cpu_name = kzalloc(strlen(dn->full_name) + strlen("/cpus") + 1, | ||
423 | GFP_KERNEL); | ||
424 | if (!cpu_name) { | ||
425 | dlpar_free_cc_nodes(dn); | ||
426 | rc = -ENOMEM; | ||
427 | goto out; | ||
428 | } | ||
429 | |||
430 | sprintf(cpu_name, "/cpus%s", dn->full_name); | ||
431 | kfree(dn->full_name); | ||
432 | dn->full_name = cpu_name; | ||
433 | |||
434 | rc = dlpar_acquire_drc(drc_index); | ||
435 | if (rc) { | ||
436 | dlpar_free_cc_nodes(dn); | ||
437 | rc = -EINVAL; | ||
438 | goto out; | ||
439 | } | ||
440 | |||
441 | rc = dlpar_attach_node(dn); | ||
442 | if (rc) { | ||
443 | dlpar_release_drc(drc_index); | ||
444 | dlpar_free_cc_nodes(dn); | ||
445 | } | ||
446 | |||
447 | rc = dlpar_online_cpu(dn); | ||
448 | out: | ||
449 | cpu_hotplug_driver_unlock(); | ||
450 | |||
451 | return rc ? rc : count; | ||
452 | } | ||
453 | |||
454 | static int dlpar_offline_cpu(struct device_node *dn) | ||
455 | { | ||
456 | int rc = 0; | ||
457 | unsigned int cpu; | ||
458 | int len, nthreads, i; | ||
459 | const u32 *intserv; | ||
460 | |||
461 | intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len); | ||
462 | if (!intserv) | ||
463 | return -EINVAL; | ||
464 | |||
465 | nthreads = len / sizeof(u32); | ||
466 | |||
467 | cpu_maps_update_begin(); | ||
468 | for (i = 0; i < nthreads; i++) { | ||
469 | for_each_present_cpu(cpu) { | ||
470 | if (get_hard_smp_processor_id(cpu) != intserv[i]) | ||
471 | continue; | ||
472 | |||
473 | if (get_cpu_current_state(cpu) == CPU_STATE_OFFLINE) | ||
474 | break; | ||
475 | |||
476 | if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) { | ||
477 | cpu_maps_update_done(); | ||
478 | rc = cpu_down(cpu); | ||
479 | if (rc) | ||
480 | goto out; | ||
481 | cpu_maps_update_begin(); | ||
482 | break; | ||
483 | |||
484 | } | ||
485 | |||
486 | /* | ||
487 | * The cpu is in CPU_STATE_INACTIVE. | ||
488 | * Upgrade it's state to CPU_STATE_OFFLINE. | ||
489 | */ | ||
490 | set_preferred_offline_state(cpu, CPU_STATE_OFFLINE); | ||
491 | BUG_ON(plpar_hcall_norets(H_PROD, intserv[i]) | ||
492 | != H_SUCCESS); | ||
493 | __cpu_die(cpu); | ||
494 | break; | ||
495 | } | ||
496 | if (cpu == num_possible_cpus()) | ||
497 | printk(KERN_WARNING "Could not find cpu to offline " | ||
498 | "with physical id 0x%x\n", intserv[i]); | ||
499 | } | ||
500 | cpu_maps_update_done(); | ||
501 | |||
502 | out: | ||
503 | return rc; | ||
504 | |||
505 | } | ||
506 | |||
507 | static ssize_t dlpar_cpu_release(const char *buf, size_t count) | ||
508 | { | ||
509 | struct device_node *dn; | ||
510 | const u32 *drc_index; | ||
511 | int rc; | ||
512 | |||
513 | dn = of_find_node_by_path(buf); | ||
514 | if (!dn) | ||
515 | return -EINVAL; | ||
516 | |||
517 | drc_index = of_get_property(dn, "ibm,my-drc-index", NULL); | ||
518 | if (!drc_index) { | ||
519 | of_node_put(dn); | ||
520 | return -EINVAL; | ||
521 | } | ||
522 | |||
523 | cpu_hotplug_driver_lock(); | ||
524 | rc = dlpar_offline_cpu(dn); | ||
525 | if (rc) { | ||
526 | of_node_put(dn); | ||
527 | rc = -EINVAL; | ||
528 | goto out; | ||
529 | } | ||
530 | |||
531 | rc = dlpar_release_drc(*drc_index); | ||
532 | if (rc) { | ||
533 | of_node_put(dn); | ||
534 | goto out; | ||
535 | } | ||
536 | |||
537 | rc = dlpar_detach_node(dn); | ||
538 | if (rc) { | ||
539 | dlpar_acquire_drc(*drc_index); | ||
540 | goto out; | ||
541 | } | ||
542 | |||
543 | of_node_put(dn); | ||
544 | out: | ||
545 | cpu_hotplug_driver_unlock(); | ||
546 | return rc ? rc : count; | ||
547 | } | ||
548 | |||
549 | static int __init pseries_dlpar_init(void) | ||
550 | { | ||
551 | ppc_md.cpu_probe = dlpar_cpu_probe; | ||
552 | ppc_md.cpu_release = dlpar_cpu_release; | ||
553 | |||
554 | return 0; | ||
555 | } | ||
556 | machine_device_initcall(pseries, pseries_dlpar_init); | ||
557 | |||
558 | #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */ | ||