Commit | Line | Data |
---|---|---|
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 | ||
36 | static void dlpar_free_cc_property(struct property *prop) | |
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; | |
58 | prop->value = kzalloc(prop->length, GFP_KERNEL); | |
59 | if (!prop->value) { | |
60 | dlpar_free_cc_property(prop); | |
61 | return NULL; | |
62 | } | |
63 | ||
64 | memcpy(prop->value, value, prop->length); | |
65 | return prop; | |
66 | } | |
67 | ||
68 | static struct device_node *dlpar_parse_cc_node(struct cc_workarea *ccwa) | |
69 | { | |
70 | struct device_node *dn; | |
71 | char *name; | |
72 | ||
73 | dn = kzalloc(sizeof(*dn), GFP_KERNEL); | |
74 | if (!dn) | |
75 | return NULL; | |
76 | ||
77 | /* The configure connector reported name does not contain a | |
78 | * preceeding '/', so we allocate a buffer large enough to | |
79 | * prepend this to the full_name. | |
80 | */ | |
81 | name = (char *)ccwa + ccwa->name_offset; | |
43caa61f | 82 | dn->full_name = kasprintf(GFP_KERNEL, "/%s", name); |
ab519a01 NF |
83 | if (!dn->full_name) { |
84 | kfree(dn); | |
85 | return NULL; | |
86 | } | |
87 | ||
ab519a01 NF |
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 | { | |
46150a05 | 239 | #ifdef CONFIG_PROC_DEVICETREE |
ab519a01 | 240 | struct proc_dir_entry *ent; |
46150a05 | 241 | #endif |
ab519a01 NF |
242 | int rc; |
243 | ||
244 | of_node_set_flag(dn, OF_DYNAMIC); | |
245 | kref_init(&dn->kref); | |
246 | dn->parent = derive_parent(dn->full_name); | |
247 | if (!dn->parent) | |
248 | return -ENOMEM; | |
249 | ||
250 | rc = blocking_notifier_call_chain(&pSeries_reconfig_chain, | |
251 | PSERIES_RECONFIG_ADD, dn); | |
252 | if (rc == NOTIFY_BAD) { | |
253 | printk(KERN_ERR "Failed to add device node %s\n", | |
254 | dn->full_name); | |
255 | return -ENOMEM; /* For now, safe to assume kmalloc failure */ | |
256 | } | |
257 | ||
258 | of_attach_node(dn); | |
259 | ||
260 | #ifdef CONFIG_PROC_DEVICETREE | |
261 | ent = proc_mkdir(strrchr(dn->full_name, '/') + 1, dn->parent->pde); | |
262 | if (ent) | |
263 | proc_device_tree_add_node(dn, ent); | |
264 | #endif | |
265 | ||
266 | of_node_put(dn->parent); | |
267 | return 0; | |
268 | } | |
269 | ||
270 | int dlpar_detach_node(struct device_node *dn) | |
271 | { | |
46150a05 | 272 | #ifdef CONFIG_PROC_DEVICETREE |
ab519a01 NF |
273 | struct device_node *parent = dn->parent; |
274 | struct property *prop = dn->properties; | |
275 | ||
ab519a01 NF |
276 | while (prop) { |
277 | remove_proc_entry(prop->name, dn->pde); | |
278 | prop = prop->next; | |
279 | } | |
280 | ||
281 | if (dn->pde) | |
282 | remove_proc_entry(dn->pde->name, parent->pde); | |
283 | #endif | |
284 | ||
285 | blocking_notifier_call_chain(&pSeries_reconfig_chain, | |
286 | PSERIES_RECONFIG_REMOVE, dn); | |
287 | of_detach_node(dn); | |
288 | of_node_put(dn); /* Must decrement the refcount */ | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
293 | #define DR_ENTITY_SENSE 9003 | |
294 | #define DR_ENTITY_PRESENT 1 | |
295 | #define DR_ENTITY_UNUSABLE 2 | |
296 | #define ALLOCATION_STATE 9003 | |
297 | #define ALLOC_UNUSABLE 0 | |
298 | #define ALLOC_USABLE 1 | |
299 | #define ISOLATION_STATE 9001 | |
300 | #define ISOLATE 0 | |
301 | #define UNISOLATE 1 | |
302 | ||
303 | int dlpar_acquire_drc(u32 drc_index) | |
304 | { | |
305 | int dr_status, rc; | |
306 | ||
307 | rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status, | |
308 | DR_ENTITY_SENSE, drc_index); | |
309 | if (rc || dr_status != DR_ENTITY_UNUSABLE) | |
310 | return -1; | |
311 | ||
312 | rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_USABLE); | |
313 | if (rc) | |
314 | return rc; | |
315 | ||
316 | rc = rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE); | |
317 | if (rc) { | |
318 | rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE); | |
319 | return rc; | |
320 | } | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
325 | int dlpar_release_drc(u32 drc_index) | |
326 | { | |
327 | int dr_status, rc; | |
328 | ||
329 | rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status, | |
330 | DR_ENTITY_SENSE, drc_index); | |
331 | if (rc || dr_status != DR_ENTITY_PRESENT) | |
332 | return -1; | |
333 | ||
334 | rc = rtas_set_indicator(ISOLATION_STATE, drc_index, ISOLATE); | |
335 | if (rc) | |
336 | return rc; | |
337 | ||
338 | rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE); | |
339 | if (rc) { | |
340 | rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE); | |
341 | return rc; | |
342 | } | |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
1a8061c4 | 347 | #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE |
ab519a01 | 348 | |
275a64f6 NF |
349 | static int dlpar_online_cpu(struct device_node *dn) |
350 | { | |
351 | int rc = 0; | |
352 | unsigned int cpu; | |
353 | int len, nthreads, i; | |
354 | const u32 *intserv; | |
355 | ||
356 | intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len); | |
357 | if (!intserv) | |
358 | return -EINVAL; | |
359 | ||
360 | nthreads = len / sizeof(u32); | |
361 | ||
362 | cpu_maps_update_begin(); | |
363 | for (i = 0; i < nthreads; i++) { | |
364 | for_each_present_cpu(cpu) { | |
365 | if (get_hard_smp_processor_id(cpu) != intserv[i]) | |
366 | continue; | |
367 | BUG_ON(get_cpu_current_state(cpu) | |
368 | != CPU_STATE_OFFLINE); | |
369 | cpu_maps_update_done(); | |
370 | rc = cpu_up(cpu); | |
371 | if (rc) | |
372 | goto out; | |
373 | cpu_maps_update_begin(); | |
374 | ||
375 | break; | |
376 | } | |
377 | if (cpu == num_possible_cpus()) | |
378 | printk(KERN_WARNING "Could not find cpu to online " | |
379 | "with physical id 0x%x\n", intserv[i]); | |
380 | } | |
381 | cpu_maps_update_done(); | |
382 | ||
383 | out: | |
384 | return rc; | |
385 | ||
386 | } | |
387 | ||
1a8061c4 NF |
388 | static ssize_t dlpar_cpu_probe(const char *buf, size_t count) |
389 | { | |
390 | struct device_node *dn; | |
391 | unsigned long drc_index; | |
392 | char *cpu_name; | |
393 | int rc; | |
394 | ||
51badebd | 395 | cpu_hotplug_driver_lock(); |
1a8061c4 | 396 | rc = strict_strtoul(buf, 0, &drc_index); |
51badebd GS |
397 | if (rc) { |
398 | rc = -EINVAL; | |
399 | goto out; | |
400 | } | |
1a8061c4 NF |
401 | |
402 | dn = dlpar_configure_connector(drc_index); | |
51badebd GS |
403 | if (!dn) { |
404 | rc = -EINVAL; | |
405 | goto out; | |
406 | } | |
1a8061c4 NF |
407 | |
408 | /* configure-connector reports cpus as living in the base | |
409 | * directory of the device tree. CPUs actually live in the | |
410 | * cpus directory so we need to fixup the full_name. | |
411 | */ | |
43caa61f | 412 | cpu_name = kasprintf(GFP_KERNEL, "/cpus%s", dn->full_name); |
1a8061c4 NF |
413 | if (!cpu_name) { |
414 | dlpar_free_cc_nodes(dn); | |
51badebd GS |
415 | rc = -ENOMEM; |
416 | goto out; | |
1a8061c4 NF |
417 | } |
418 | ||
1a8061c4 NF |
419 | kfree(dn->full_name); |
420 | dn->full_name = cpu_name; | |
421 | ||
422 | rc = dlpar_acquire_drc(drc_index); | |
423 | if (rc) { | |
424 | dlpar_free_cc_nodes(dn); | |
51badebd GS |
425 | rc = -EINVAL; |
426 | goto out; | |
1a8061c4 NF |
427 | } |
428 | ||
429 | rc = dlpar_attach_node(dn); | |
430 | if (rc) { | |
431 | dlpar_release_drc(drc_index); | |
432 | dlpar_free_cc_nodes(dn); | |
a7df5c5e | 433 | goto out; |
1a8061c4 NF |
434 | } |
435 | ||
275a64f6 | 436 | rc = dlpar_online_cpu(dn); |
51badebd GS |
437 | out: |
438 | cpu_hotplug_driver_unlock(); | |
b6db63d1 | 439 | |
1a8061c4 NF |
440 | return rc ? rc : count; |
441 | } | |
442 | ||
275a64f6 NF |
443 | static int dlpar_offline_cpu(struct device_node *dn) |
444 | { | |
445 | int rc = 0; | |
446 | unsigned int cpu; | |
447 | int len, nthreads, i; | |
448 | const u32 *intserv; | |
449 | ||
450 | intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len); | |
451 | if (!intserv) | |
452 | return -EINVAL; | |
453 | ||
454 | nthreads = len / sizeof(u32); | |
455 | ||
456 | cpu_maps_update_begin(); | |
457 | for (i = 0; i < nthreads; i++) { | |
458 | for_each_present_cpu(cpu) { | |
459 | if (get_hard_smp_processor_id(cpu) != intserv[i]) | |
460 | continue; | |
461 | ||
462 | if (get_cpu_current_state(cpu) == CPU_STATE_OFFLINE) | |
463 | break; | |
464 | ||
465 | if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) { | |
466 | cpu_maps_update_done(); | |
467 | rc = cpu_down(cpu); | |
468 | if (rc) | |
469 | goto out; | |
470 | cpu_maps_update_begin(); | |
471 | break; | |
472 | ||
473 | } | |
474 | ||
475 | /* | |
476 | * The cpu is in CPU_STATE_INACTIVE. | |
477 | * Upgrade it's state to CPU_STATE_OFFLINE. | |
478 | */ | |
479 | set_preferred_offline_state(cpu, CPU_STATE_OFFLINE); | |
480 | BUG_ON(plpar_hcall_norets(H_PROD, intserv[i]) | |
481 | != H_SUCCESS); | |
482 | __cpu_die(cpu); | |
483 | break; | |
484 | } | |
485 | if (cpu == num_possible_cpus()) | |
486 | printk(KERN_WARNING "Could not find cpu to offline " | |
487 | "with physical id 0x%x\n", intserv[i]); | |
488 | } | |
489 | cpu_maps_update_done(); | |
490 | ||
491 | out: | |
492 | return rc; | |
493 | ||
494 | } | |
495 | ||
1a8061c4 NF |
496 | static ssize_t dlpar_cpu_release(const char *buf, size_t count) |
497 | { | |
498 | struct device_node *dn; | |
499 | const u32 *drc_index; | |
500 | int rc; | |
501 | ||
502 | dn = of_find_node_by_path(buf); | |
503 | if (!dn) | |
504 | return -EINVAL; | |
505 | ||
506 | drc_index = of_get_property(dn, "ibm,my-drc-index", NULL); | |
507 | if (!drc_index) { | |
508 | of_node_put(dn); | |
509 | return -EINVAL; | |
510 | } | |
511 | ||
51badebd | 512 | cpu_hotplug_driver_lock(); |
275a64f6 | 513 | rc = dlpar_offline_cpu(dn); |
b6db63d1 GS |
514 | if (rc) { |
515 | of_node_put(dn); | |
51badebd GS |
516 | rc = -EINVAL; |
517 | goto out; | |
b6db63d1 GS |
518 | } |
519 | ||
1a8061c4 NF |
520 | rc = dlpar_release_drc(*drc_index); |
521 | if (rc) { | |
522 | of_node_put(dn); | |
51badebd | 523 | goto out; |
1a8061c4 NF |
524 | } |
525 | ||
526 | rc = dlpar_detach_node(dn); | |
527 | if (rc) { | |
528 | dlpar_acquire_drc(*drc_index); | |
51badebd | 529 | goto out; |
1a8061c4 NF |
530 | } |
531 | ||
532 | of_node_put(dn); | |
51badebd GS |
533 | out: |
534 | cpu_hotplug_driver_unlock(); | |
535 | return rc ? rc : count; | |
1a8061c4 NF |
536 | } |
537 | ||
538 | static int __init pseries_dlpar_init(void) | |
539 | { | |
540 | ppc_md.cpu_probe = dlpar_cpu_probe; | |
541 | ppc_md.cpu_release = dlpar_cpu_release; | |
542 | ||
543 | return 0; | |
544 | } | |
545 | machine_device_initcall(pseries, pseries_dlpar_init); | |
546 | ||
547 | #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */ |