?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / arch / powerpc / platforms / pseries / dlpar.c
bloba0b20c03f078cc41b9ad126fbf2603a4ffb68463
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 #define pr_fmt(fmt) "dlpar: " fmt
14
15 #include <linux/kernel.h>
16 #include <linux/notifier.h>
17 #include <linux/spinlock.h>
18 #include <linux/cpu.h>
19 #include <linux/slab.h>
20 #include <linux/of.h>
21
22 #include "of_helpers.h"
23 #include "pseries.h"
24
25 #include <asm/prom.h>
26 #include <asm/machdep.h>
27 #include <linux/uaccess.h>
28 #include <asm/rtas.h>
29
30 static struct workqueue_struct *pseries_hp_wq;
31
32 struct pseries_hp_work {
33 struct work_struct work;
34 struct pseries_hp_errorlog *errlog;
35 struct completion *hp_completion;
36 int *rc;
37 };
38
39 struct cc_workarea {
40 __be32 drc_index;
41 __be32 zero;
42 __be32 name_offset;
43 __be32 prop_length;
44 __be32 prop_offset;
45 };
46
47 void dlpar_free_cc_property(struct property *prop)
48 {
49 kfree(prop->name);
50 kfree(prop->value);
51 kfree(prop);
52 }
53
54 static struct property *dlpar_parse_cc_property(struct cc_workarea *ccwa)
55 {
56 struct property *prop;
57 char *name;
58 char *value;
59
60 prop = kzalloc(sizeof(*prop), GFP_KERNEL);
61 if (!prop)
62 return NULL;
63
64 name = (char *)ccwa + be32_to_cpu(ccwa->name_offset);
65 prop->name = kstrdup(name, GFP_KERNEL);
66
67 prop->length = be32_to_cpu(ccwa->prop_length);
68 value = (char *)ccwa + be32_to_cpu(ccwa->prop_offset);
69 prop->value = kmemdup(value, prop->length, GFP_KERNEL);
70 if (!prop->value) {
71 dlpar_free_cc_property(prop);
72 return NULL;
73 }
74
75 return prop;
76 }
77
78 static struct device_node *dlpar_parse_cc_node(struct cc_workarea *ccwa)
79 {
80 struct device_node *dn;
81 const char *name;
82
83 dn = kzalloc(sizeof(*dn), GFP_KERNEL);
84 if (!dn)
85 return NULL;
86
87 name = (const char *)ccwa + be32_to_cpu(ccwa->name_offset);
88 dn->full_name = kstrdup(name, GFP_KERNEL);
89 if (!dn->full_name) {
90 kfree(dn);
91 return NULL;
92 }
93
94 of_node_set_flag(dn, OF_DYNAMIC);
95 of_node_init(dn);
96
97 return dn;
98 }
99
100 static void dlpar_free_one_cc_node(struct device_node *dn)
101 {
102 struct property *prop;
103
104 while (dn->properties) {
105 prop = dn->properties;
106 dn->properties = prop->next;
107 dlpar_free_cc_property(prop);
108 }
109
110 kfree(dn->full_name);
111 kfree(dn);
112 }
113
114 void dlpar_free_cc_nodes(struct device_node *dn)
115 {
116 if (dn->child)
117 dlpar_free_cc_nodes(dn->child);
118
119 if (dn->sibling)
120 dlpar_free_cc_nodes(dn->sibling);
121
122 dlpar_free_one_cc_node(dn);
123 }
124
125 #define COMPLETE 0
126 #define NEXT_SIBLING 1
127 #define NEXT_CHILD 2
128 #define NEXT_PROPERTY 3
129 #define PREV_PARENT 4
130 #define MORE_MEMORY 5
131 #define CALL_AGAIN -2
132 #define ERR_CFG_USE -9003
133
134 struct device_node *dlpar_configure_connector(__be32 drc_index,
135 struct device_node *parent)
136 {
137 struct device_node *dn;
138 struct device_node *first_dn = NULL;
139 struct device_node *last_dn = NULL;
140 struct property *property;
141 struct property *last_property = NULL;
142 struct cc_workarea *ccwa;
143 char *data_buf;
144 int cc_token;
145 int rc = -1;
146
147 cc_token = rtas_token("ibm,configure-connector");
148 if (cc_token == RTAS_UNKNOWN_SERVICE)
149 return NULL;
150
151 data_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
152 if (!data_buf)
153 return NULL;
154
155 ccwa = (struct cc_workarea *)&data_buf[0];
156 ccwa->drc_index = drc_index;
157 ccwa->zero = 0;
158
159 do {
160 /* Since we release the rtas_data_buf lock between configure
161 * connector calls we want to re-populate the rtas_data_buffer
162 * with the contents of the previous call.
163 */
164 spin_lock(&rtas_data_buf_lock);
165
166 memcpy(rtas_data_buf, data_buf, RTAS_DATA_BUF_SIZE);
167 rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL);
168 memcpy(data_buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
169
170 spin_unlock(&rtas_data_buf_lock);
171
172 switch (rc) {
173 case COMPLETE:
174 break;
175
176 case NEXT_SIBLING:
177 dn = dlpar_parse_cc_node(ccwa);
178 if (!dn)
179 goto cc_error;
180
181 dn->parent = last_dn->parent;
182 last_dn->sibling = dn;
183 last_dn = dn;
184 break;
185
186 case NEXT_CHILD:
187 dn = dlpar_parse_cc_node(ccwa);
188 if (!dn)
189 goto cc_error;
190
191 if (!first_dn) {
192 dn->parent = parent;
193 first_dn = dn;
194 } else {
195 dn->parent = last_dn;
196 if (last_dn)
197 last_dn->child = dn;
198 }
199
200 last_dn = dn;
201 break;
202
203 case NEXT_PROPERTY:
204 property = dlpar_parse_cc_property(ccwa);
205 if (!property)
206 goto cc_error;
207
208 if (!last_dn->properties)
209 last_dn->properties = property;
210 else
211 last_property->next = property;
212
213 last_property = property;
214 break;
215
216 case PREV_PARENT:
217 last_dn = last_dn->parent;
218 break;
219
220 case CALL_AGAIN:
221 break;
222
223 case MORE_MEMORY:
224 case ERR_CFG_USE:
225 default:
226 printk(KERN_ERR "Unexpected Error (%d) "
227 "returned from configure-connector\n", rc);
228 goto cc_error;
229 }
230 } while (rc);
231
232 cc_error:
233 kfree(data_buf);
234
235 if (rc) {
236 if (first_dn)
237 dlpar_free_cc_nodes(first_dn);
238
239 return NULL;
240 }
241
242 return first_dn;
243 }
244
245 int dlpar_attach_node(struct device_node *dn, struct device_node *parent)
246 {
247 int rc;
248
249 dn->parent = parent;
250
251 rc = of_attach_node(dn);
252 if (rc) {
253 printk(KERN_ERR "Failed to add device node %pOF\n", dn);
254 return rc;
255 }
256
257 return 0;
258 }
259
260 int dlpar_detach_node(struct device_node *dn)
261 {
262 struct device_node *child;
263 int rc;
264
265 child = of_get_next_child(dn, NULL);
266 while (child) {
267 dlpar_detach_node(child);
268 child = of_get_next_child(dn, child);
269 }
270
271 rc = of_detach_node(dn);
272 if (rc)
273 return rc;
274
275 return 0;
276 }
277
278 #define DR_ENTITY_SENSE 9003
279 #define DR_ENTITY_PRESENT 1
280 #define DR_ENTITY_UNUSABLE 2
281 #define ALLOCATION_STATE 9003
282 #define ALLOC_UNUSABLE 0
283 #define ALLOC_USABLE 1
284 #define ISOLATION_STATE 9001
285 #define ISOLATE 0
286 #define UNISOLATE 1
287
288 int dlpar_acquire_drc(u32 drc_index)
289 {
290 int dr_status, rc;
291
292 rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
293 DR_ENTITY_SENSE, drc_index);
294 if (rc || dr_status != DR_ENTITY_UNUSABLE)
295 return -1;
296
297 rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_USABLE);
298 if (rc)
299 return rc;
300
301 rc = rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
302 if (rc) {
303 rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
304 return rc;
305 }
306
307 return 0;
308 }
309
310 int dlpar_release_drc(u32 drc_index)
311 {
312 int dr_status, rc;
313
314 rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
315 DR_ENTITY_SENSE, drc_index);
316 if (rc || dr_status != DR_ENTITY_PRESENT)
317 return -1;
318
319 rc = rtas_set_indicator(ISOLATION_STATE, drc_index, ISOLATE);
320 if (rc)
321 return rc;
322
323 rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
324 if (rc) {
325 rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
326 return rc;
327 }
328
329 return 0;
330 }
331
332 static int handle_dlpar_errorlog(struct pseries_hp_errorlog *hp_elog)
333 {
334 int rc;
335
336 /* pseries error logs are in BE format, convert to cpu type */
337 switch (hp_elog->id_type) {
338 case PSERIES_HP_ELOG_ID_DRC_COUNT:
339 hp_elog->_drc_u.drc_count =
340 be32_to_cpu(hp_elog->_drc_u.drc_count);
341 break;
342 case PSERIES_HP_ELOG_ID_DRC_INDEX:
343 hp_elog->_drc_u.drc_index =
344 be32_to_cpu(hp_elog->_drc_u.drc_index);
345 break;
346 case PSERIES_HP_ELOG_ID_DRC_IC:
347 hp_elog->_drc_u.ic.count =
348 be32_to_cpu(hp_elog->_drc_u.ic.count);
349 hp_elog->_drc_u.ic.index =
350 be32_to_cpu(hp_elog->_drc_u.ic.index);
351 }
352
353 switch (hp_elog->resource) {
354 case PSERIES_HP_ELOG_RESOURCE_MEM:
355 rc = dlpar_memory(hp_elog);
356 break;
357 case PSERIES_HP_ELOG_RESOURCE_CPU:
358 rc = dlpar_cpu(hp_elog);
359 break;
360 default:
361 pr_warn_ratelimited("Invalid resource (%d) specified\n",
362 hp_elog->resource);
363 rc = -EINVAL;
364 }
365
366 return rc;
367 }
368
369 static void pseries_hp_work_fn(struct work_struct *work)
370 {
371 struct pseries_hp_work *hp_work =
372 container_of(work, struct pseries_hp_work, work);
373
374 if (hp_work->rc)
375 *(hp_work->rc) = handle_dlpar_errorlog(hp_work->errlog);
376 else
377 handle_dlpar_errorlog(hp_work->errlog);
378
379 if (hp_work->hp_completion)
380 complete(hp_work->hp_completion);
381
382 kfree(hp_work->errlog);
383 kfree((void *)work);
384 }
385
386 void queue_hotplug_event(struct pseries_hp_errorlog *hp_errlog,
387 struct completion *hotplug_done, int *rc)
388 {
389 struct pseries_hp_work *work;
390 struct pseries_hp_errorlog *hp_errlog_copy;
391
392 hp_errlog_copy = kmalloc(sizeof(struct pseries_hp_errorlog),
393 GFP_KERNEL);
394 memcpy(hp_errlog_copy, hp_errlog, sizeof(struct pseries_hp_errorlog));
395
396 work = kmalloc(sizeof(struct pseries_hp_work), GFP_KERNEL);
397 if (work) {
398 INIT_WORK((struct work_struct *)work, pseries_hp_work_fn);
399 work->errlog = hp_errlog_copy;
400 work->hp_completion = hotplug_done;
401 work->rc = rc;
402 queue_work(pseries_hp_wq, (struct work_struct *)work);
403 } else {
404 *rc = -ENOMEM;
405 kfree(hp_errlog_copy);
406 complete(hotplug_done);
407 }
408 }
409
410 static int dlpar_parse_resource(char **cmd, struct pseries_hp_errorlog *hp_elog)
411 {
412 char *arg;
413
414 arg = strsep(cmd, " ");
415 if (!arg)
416 return -EINVAL;
417
418 if (sysfs_streq(arg, "memory")) {
419 hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_MEM;
420 } else if (sysfs_streq(arg, "cpu")) {
421 hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_CPU;
422 } else {
423 pr_err("Invalid resource specified.\n");
424 return -EINVAL;
425 }
426
427 return 0;
428 }
429
430 static int dlpar_parse_action(char **cmd, struct pseries_hp_errorlog *hp_elog)
431 {
432 char *arg;
433
434 arg = strsep(cmd, " ");
435 if (!arg)
436 return -EINVAL;
437
438 if (sysfs_streq(arg, "add")) {
439 hp_elog->action = PSERIES_HP_ELOG_ACTION_ADD;
440 } else if (sysfs_streq(arg, "remove")) {
441 hp_elog->action = PSERIES_HP_ELOG_ACTION_REMOVE;
442 } else {
443 pr_err("Invalid action specified.\n");
444 return -EINVAL;
445 }
446
447 return 0;
448 }
449
450 static int dlpar_parse_id_type(char **cmd, struct pseries_hp_errorlog *hp_elog)
451 {
452 char *arg;
453 u32 count, index;
454
455 arg = strsep(cmd, " ");
456 if (!arg)
457 return -EINVAL;
458
459 if (sysfs_streq(arg, "indexed-count")) {
460 hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_IC;
461 arg = strsep(cmd, " ");
462 if (!arg) {
463 pr_err("No DRC count specified.\n");
464 return -EINVAL;
465 }
466
467 if (kstrtou32(arg, 0, &count)) {
468 pr_err("Invalid DRC count specified.\n");
469 return -EINVAL;
470 }
471
472 arg = strsep(cmd, " ");
473 if (!arg) {
474 pr_err("No DRC Index specified.\n");
475 return -EINVAL;
476 }
477
478 if (kstrtou32(arg, 0, &index)) {
479 pr_err("Invalid DRC Index specified.\n");
480 return -EINVAL;
481 }
482
483 hp_elog->_drc_u.ic.count = cpu_to_be32(count);
484 hp_elog->_drc_u.ic.index = cpu_to_be32(index);
485 } else if (sysfs_streq(arg, "index")) {
486 hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_INDEX;
487 arg = strsep(cmd, " ");
488 if (!arg) {
489 pr_err("No DRC Index specified.\n");
490 return -EINVAL;
491 }
492
493 if (kstrtou32(arg, 0, &index)) {
494 pr_err("Invalid DRC Index specified.\n");
495 return -EINVAL;
496 }
497
498 hp_elog->_drc_u.drc_index = cpu_to_be32(index);
499 } else if (sysfs_streq(arg, "count")) {
500 hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_COUNT;
501 arg = strsep(cmd, " ");
502 if (!arg) {
503 pr_err("No DRC count specified.\n");
504 return -EINVAL;
505 }
506
507 if (kstrtou32(arg, 0, &count)) {
508 pr_err("Invalid DRC count specified.\n");
509 return -EINVAL;
510 }
511
512 hp_elog->_drc_u.drc_count = cpu_to_be32(count);
513 } else {
514 pr_err("Invalid id_type specified.\n");
515 return -EINVAL;
516 }
517
518 return 0;
519 }
520
521 static ssize_t dlpar_store(struct class *class, struct class_attribute *attr,
522 const char *buf, size_t count)
523 {
524 struct pseries_hp_errorlog *hp_elog;
525 struct completion hotplug_done;
526 char *argbuf;
527 char *args;
528 int rc;
529
530 args = argbuf = kstrdup(buf, GFP_KERNEL);
531 hp_elog = kzalloc(sizeof(*hp_elog), GFP_KERNEL);
532 if (!hp_elog || !argbuf) {
533 pr_info("Could not allocate resources for DLPAR operation\n");
534 kfree(argbuf);
535 kfree(hp_elog);
536 return -ENOMEM;
537 }
538
539 /*
540 * Parse out the request from the user, this will be in the form:
541 * <resource> <action> <id_type> <id>
542 */
543 rc = dlpar_parse_resource(&args, hp_elog);
544 if (rc)
545 goto dlpar_store_out;
546
547 rc = dlpar_parse_action(&args, hp_elog);
548 if (rc)
549 goto dlpar_store_out;
550
551 rc = dlpar_parse_id_type(&args, hp_elog);
552 if (rc)
553 goto dlpar_store_out;
554
555 init_completion(&hotplug_done);
556 queue_hotplug_event(hp_elog, &hotplug_done, &rc);
557 wait_for_completion(&hotplug_done);
558
559 dlpar_store_out:
560 kfree(argbuf);
561 kfree(hp_elog);
562
563 if (rc)
564 pr_err("Could not handle DLPAR request \"%s\"\n", buf);
565
566 return rc ? rc : count;
567 }
568
569 static ssize_t dlpar_show(struct class *class, struct class_attribute *attr,
570 char *buf)
571 {
572 return sprintf(buf, "%s\n", "memory,cpu");
573 }
574
575 static CLASS_ATTR_RW(dlpar);
576
577 int __init dlpar_workqueue_init(void)
578 {
579 if (pseries_hp_wq)
580 return 0;
581
582 pseries_hp_wq = alloc_workqueue("pseries hotplug workqueue",
583 WQ_UNBOUND, 1);
584
585 return pseries_hp_wq ? 0 : -ENOMEM;
586 }
587
588 static int __init dlpar_sysfs_init(void)
589 {
590 int rc;
591
592 rc = dlpar_workqueue_init();
593 if (rc)
594 return rc;
595
596 return sysfs_create_file(kernel_kobj, &class_attr_dlpar.attr);
597 }
598 machine_device_initcall(pseries, dlpar_sysfs_init);
599
CRIS linux kernel tree