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> | |
ab519a01 NF |
16 | #include <linux/spinlock.h> |
17 | #include <linux/cpu.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1cf3d8b3 | 19 | #include <linux/of.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> | |
ab519a01 NF |
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 | ||
20648974 | 35 | void dlpar_free_cc_property(struct property *prop) |
ab519a01 NF |
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; | |
e72ed6b5 | 57 | prop->value = kmemdup(value, prop->length, GFP_KERNEL); |
ab519a01 NF |
58 | if (!prop->value) { |
59 | dlpar_free_cc_property(prop); | |
60 | return NULL; | |
61 | } | |
62 | ||
ab519a01 NF |
63 | return prop; |
64 | } | |
65 | ||
8d5ff320 TD |
66 | static struct device_node *dlpar_parse_cc_node(struct cc_workarea *ccwa, |
67 | const char *path) | |
ab519a01 NF |
68 | { |
69 | struct device_node *dn; | |
70 | char *name; | |
71 | ||
8d5ff320 TD |
72 | /* If parent node path is "/" advance path to NULL terminator to |
73 | * prevent double leading slashs in full_name. | |
74 | */ | |
75 | if (!path[1]) | |
76 | path++; | |
77 | ||
ab519a01 NF |
78 | dn = kzalloc(sizeof(*dn), GFP_KERNEL); |
79 | if (!dn) | |
80 | return NULL; | |
81 | ||
ab519a01 | 82 | name = (char *)ccwa + ccwa->name_offset; |
8d5ff320 | 83 | dn->full_name = kasprintf(GFP_KERNEL, "%s/%s", path, name); |
ab519a01 NF |
84 | if (!dn->full_name) { |
85 | kfree(dn); | |
86 | return NULL; | |
87 | } | |
88 | ||
1578cb76 TD |
89 | of_node_set_flag(dn, OF_DYNAMIC); |
90 | kref_init(&dn->kref); | |
91 | ||
ab519a01 NF |
92 | return dn; |
93 | } | |
94 | ||
95 | static void dlpar_free_one_cc_node(struct device_node *dn) | |
96 | { | |
97 | struct property *prop; | |
98 | ||
99 | while (dn->properties) { | |
100 | prop = dn->properties; | |
101 | dn->properties = prop->next; | |
102 | dlpar_free_cc_property(prop); | |
103 | } | |
104 | ||
105 | kfree(dn->full_name); | |
106 | kfree(dn); | |
107 | } | |
108 | ||
20648974 | 109 | void dlpar_free_cc_nodes(struct device_node *dn) |
ab519a01 NF |
110 | { |
111 | if (dn->child) | |
112 | dlpar_free_cc_nodes(dn->child); | |
113 | ||
114 | if (dn->sibling) | |
115 | dlpar_free_cc_nodes(dn->sibling); | |
116 | ||
117 | dlpar_free_one_cc_node(dn); | |
118 | } | |
119 | ||
9c740025 | 120 | #define COMPLETE 0 |
ab519a01 NF |
121 | #define NEXT_SIBLING 1 |
122 | #define NEXT_CHILD 2 | |
123 | #define NEXT_PROPERTY 3 | |
124 | #define PREV_PARENT 4 | |
125 | #define MORE_MEMORY 5 | |
126 | #define CALL_AGAIN -2 | |
127 | #define ERR_CFG_USE -9003 | |
128 | ||
8d5ff320 TD |
129 | struct device_node *dlpar_configure_connector(u32 drc_index, |
130 | struct device_node *parent) | |
ab519a01 NF |
131 | { |
132 | struct device_node *dn; | |
133 | struct device_node *first_dn = NULL; | |
134 | struct device_node *last_dn = NULL; | |
135 | struct property *property; | |
136 | struct property *last_property = NULL; | |
137 | struct cc_workarea *ccwa; | |
93f68f1e | 138 | char *data_buf; |
8d5ff320 | 139 | const char *parent_path = parent->full_name; |
ab519a01 | 140 | int cc_token; |
93f68f1e | 141 | int rc = -1; |
ab519a01 NF |
142 | |
143 | cc_token = rtas_token("ibm,configure-connector"); | |
144 | if (cc_token == RTAS_UNKNOWN_SERVICE) | |
145 | return NULL; | |
146 | ||
93f68f1e NF |
147 | data_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL); |
148 | if (!data_buf) | |
149 | return NULL; | |
150 | ||
151 | ccwa = (struct cc_workarea *)&data_buf[0]; | |
ab519a01 NF |
152 | ccwa->drc_index = drc_index; |
153 | ccwa->zero = 0; | |
154 | ||
93f68f1e NF |
155 | do { |
156 | /* Since we release the rtas_data_buf lock between configure | |
157 | * connector calls we want to re-populate the rtas_data_buffer | |
158 | * with the contents of the previous call. | |
159 | */ | |
160 | spin_lock(&rtas_data_buf_lock); | |
161 | ||
162 | memcpy(rtas_data_buf, data_buf, RTAS_DATA_BUF_SIZE); | |
163 | rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL); | |
164 | memcpy(data_buf, rtas_data_buf, RTAS_DATA_BUF_SIZE); | |
165 | ||
166 | spin_unlock(&rtas_data_buf_lock); | |
167 | ||
ab519a01 | 168 | switch (rc) { |
9c740025 AB |
169 | case COMPLETE: |
170 | break; | |
171 | ||
ab519a01 | 172 | case NEXT_SIBLING: |
8d5ff320 | 173 | dn = dlpar_parse_cc_node(ccwa, parent_path); |
ab519a01 NF |
174 | if (!dn) |
175 | goto cc_error; | |
176 | ||
177 | dn->parent = last_dn->parent; | |
178 | last_dn->sibling = dn; | |
179 | last_dn = dn; | |
180 | break; | |
181 | ||
182 | case NEXT_CHILD: | |
8d5ff320 TD |
183 | if (first_dn) |
184 | parent_path = last_dn->full_name; | |
185 | ||
186 | dn = dlpar_parse_cc_node(ccwa, parent_path); | |
ab519a01 NF |
187 | if (!dn) |
188 | goto cc_error; | |
189 | ||
8d5ff320 TD |
190 | if (!first_dn) { |
191 | dn->parent = parent; | |
ab519a01 | 192 | first_dn = dn; |
8d5ff320 | 193 | } else { |
ab519a01 NF |
194 | dn->parent = last_dn; |
195 | if (last_dn) | |
196 | last_dn->child = dn; | |
197 | } | |
198 | ||
199 | last_dn = dn; | |
200 | break; | |
201 | ||
202 | case NEXT_PROPERTY: | |
203 | property = dlpar_parse_cc_property(ccwa); | |
204 | if (!property) | |
205 | goto cc_error; | |
206 | ||
207 | if (!last_dn->properties) | |
208 | last_dn->properties = property; | |
209 | else | |
210 | last_property->next = property; | |
211 | ||
212 | last_property = property; | |
213 | break; | |
214 | ||
215 | case PREV_PARENT: | |
216 | last_dn = last_dn->parent; | |
8d5ff320 | 217 | parent_path = last_dn->parent->full_name; |
ab519a01 NF |
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 | } | |
93f68f1e | 230 | } while (rc); |
ab519a01 | 231 | |
93f68f1e NF |
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; | |
ab519a01 NF |
240 | } |
241 | ||
ab519a01 | 242 | return first_dn; |
ab519a01 NF |
243 | } |
244 | ||
245 | static struct device_node *derive_parent(const char *path) | |
246 | { | |
247 | struct device_node *parent; | |
248 | char *last_slash; | |
249 | ||
250 | last_slash = strrchr(path, '/'); | |
251 | if (last_slash == path) { | |
252 | parent = of_find_node_by_path("/"); | |
253 | } else { | |
254 | char *parent_path; | |
255 | int parent_path_len = last_slash - path + 1; | |
256 | parent_path = kmalloc(parent_path_len, GFP_KERNEL); | |
257 | if (!parent_path) | |
258 | return NULL; | |
259 | ||
260 | strlcpy(parent_path, path, parent_path_len); | |
261 | parent = of_find_node_by_path(parent_path); | |
262 | kfree(parent_path); | |
263 | } | |
264 | ||
265 | return parent; | |
266 | } | |
267 | ||
268 | int dlpar_attach_node(struct device_node *dn) | |
269 | { | |
ab519a01 NF |
270 | int rc; |
271 | ||
ab519a01 NF |
272 | dn->parent = derive_parent(dn->full_name); |
273 | if (!dn->parent) | |
274 | return -ENOMEM; | |
275 | ||
1cf3d8b3 | 276 | rc = of_attach_node(dn); |
3aef19f0 | 277 | if (rc) { |
ab519a01 NF |
278 | printk(KERN_ERR "Failed to add device node %s\n", |
279 | dn->full_name); | |
3aef19f0 | 280 | return rc; |
ab519a01 NF |
281 | } |
282 | ||
ab519a01 NF |
283 | of_node_put(dn->parent); |
284 | return 0; | |
285 | } | |
286 | ||
287 | int dlpar_detach_node(struct device_node *dn) | |
288 | { | |
5935ff43 | 289 | struct device_node *child; |
1cf3d8b3 | 290 | int rc; |
ab519a01 | 291 | |
5935ff43 TD |
292 | child = of_get_next_child(dn, NULL); |
293 | while (child) { | |
294 | dlpar_detach_node(child); | |
295 | child = of_get_next_child(dn, child); | |
296 | } | |
297 | ||
1cf3d8b3 NF |
298 | rc = of_detach_node(dn); |
299 | if (rc) | |
300 | return rc; | |
301 | ||
302 | of_node_put(dn); /* Must decrement the refcount */ | |
ab519a01 NF |
303 | return 0; |
304 | } | |
305 | ||
306 | #define DR_ENTITY_SENSE 9003 | |
307 | #define DR_ENTITY_PRESENT 1 | |
308 | #define DR_ENTITY_UNUSABLE 2 | |
309 | #define ALLOCATION_STATE 9003 | |
310 | #define ALLOC_UNUSABLE 0 | |
311 | #define ALLOC_USABLE 1 | |
312 | #define ISOLATION_STATE 9001 | |
313 | #define ISOLATE 0 | |
314 | #define UNISOLATE 1 | |
315 | ||
316 | int dlpar_acquire_drc(u32 drc_index) | |
317 | { | |
318 | int dr_status, rc; | |
319 | ||
320 | rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status, | |
321 | DR_ENTITY_SENSE, drc_index); | |
322 | if (rc || dr_status != DR_ENTITY_UNUSABLE) | |
323 | return -1; | |
324 | ||
325 | rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_USABLE); | |
326 | if (rc) | |
327 | return rc; | |
328 | ||
329 | rc = rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE); | |
330 | if (rc) { | |
331 | rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE); | |
332 | return rc; | |
333 | } | |
334 | ||
335 | return 0; | |
336 | } | |
337 | ||
338 | int dlpar_release_drc(u32 drc_index) | |
339 | { | |
340 | int dr_status, rc; | |
341 | ||
342 | rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status, | |
343 | DR_ENTITY_SENSE, drc_index); | |
344 | if (rc || dr_status != DR_ENTITY_PRESENT) | |
345 | return -1; | |
346 | ||
347 | rc = rtas_set_indicator(ISOLATION_STATE, drc_index, ISOLATE); | |
348 | if (rc) | |
349 | return rc; | |
350 | ||
351 | rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE); | |
352 | if (rc) { | |
353 | rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE); | |
354 | return rc; | |
355 | } | |
356 | ||
357 | return 0; | |
358 | } | |
359 | ||
1a8061c4 | 360 | #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE |
ab519a01 | 361 | |
275a64f6 NF |
362 | static int dlpar_online_cpu(struct device_node *dn) |
363 | { | |
364 | int rc = 0; | |
365 | unsigned int cpu; | |
366 | int len, nthreads, i; | |
367 | const u32 *intserv; | |
368 | ||
369 | intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len); | |
370 | if (!intserv) | |
371 | return -EINVAL; | |
372 | ||
373 | nthreads = len / sizeof(u32); | |
374 | ||
375 | cpu_maps_update_begin(); | |
376 | for (i = 0; i < nthreads; i++) { | |
377 | for_each_present_cpu(cpu) { | |
378 | if (get_hard_smp_processor_id(cpu) != intserv[i]) | |
379 | continue; | |
380 | BUG_ON(get_cpu_current_state(cpu) | |
381 | != CPU_STATE_OFFLINE); | |
382 | cpu_maps_update_done(); | |
383 | rc = cpu_up(cpu); | |
384 | if (rc) | |
385 | goto out; | |
386 | cpu_maps_update_begin(); | |
387 | ||
388 | break; | |
389 | } | |
390 | if (cpu == num_possible_cpus()) | |
391 | printk(KERN_WARNING "Could not find cpu to online " | |
392 | "with physical id 0x%x\n", intserv[i]); | |
393 | } | |
394 | cpu_maps_update_done(); | |
395 | ||
396 | out: | |
397 | return rc; | |
398 | ||
399 | } | |
400 | ||
1a8061c4 NF |
401 | static ssize_t dlpar_cpu_probe(const char *buf, size_t count) |
402 | { | |
8d5ff320 | 403 | struct device_node *dn, *parent; |
1a8061c4 | 404 | unsigned long drc_index; |
1a8061c4 NF |
405 | int rc; |
406 | ||
407 | rc = strict_strtoul(buf, 0, &drc_index); | |
6dedcca6 TK |
408 | if (rc) |
409 | return -EINVAL; | |
1a8061c4 | 410 | |
8d5ff320 | 411 | parent = of_find_node_by_path("/cpus"); |
6dedcca6 TK |
412 | if (!parent) |
413 | return -ENODEV; | |
1a8061c4 | 414 | |
8d5ff320 | 415 | dn = dlpar_configure_connector(drc_index, parent); |
6dedcca6 TK |
416 | if (!dn) |
417 | return -EINVAL; | |
1a8061c4 | 418 | |
8d5ff320 | 419 | of_node_put(parent); |
1a8061c4 NF |
420 | |
421 | rc = dlpar_acquire_drc(drc_index); | |
422 | if (rc) { | |
423 | dlpar_free_cc_nodes(dn); | |
6dedcca6 | 424 | return -EINVAL; |
1a8061c4 NF |
425 | } |
426 | ||
427 | rc = dlpar_attach_node(dn); | |
428 | if (rc) { | |
429 | dlpar_release_drc(drc_index); | |
430 | dlpar_free_cc_nodes(dn); | |
6dedcca6 | 431 | return rc; |
1a8061c4 NF |
432 | } |
433 | ||
275a64f6 | 434 | rc = dlpar_online_cpu(dn); |
6dedcca6 TK |
435 | if (rc) |
436 | return rc; | |
b6db63d1 | 437 | |
6dedcca6 | 438 | return count; |
1a8061c4 NF |
439 | } |
440 | ||
275a64f6 NF |
441 | static int dlpar_offline_cpu(struct device_node *dn) |
442 | { | |
443 | int rc = 0; | |
444 | unsigned int cpu; | |
445 | int len, nthreads, i; | |
446 | const u32 *intserv; | |
447 | ||
448 | intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len); | |
449 | if (!intserv) | |
450 | return -EINVAL; | |
451 | ||
452 | nthreads = len / sizeof(u32); | |
453 | ||
454 | cpu_maps_update_begin(); | |
455 | for (i = 0; i < nthreads; i++) { | |
456 | for_each_present_cpu(cpu) { | |
457 | if (get_hard_smp_processor_id(cpu) != intserv[i]) | |
458 | continue; | |
459 | ||
460 | if (get_cpu_current_state(cpu) == CPU_STATE_OFFLINE) | |
461 | break; | |
462 | ||
463 | if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) { | |
ceddee23 | 464 | set_preferred_offline_state(cpu, CPU_STATE_OFFLINE); |
275a64f6 NF |
465 | cpu_maps_update_done(); |
466 | rc = cpu_down(cpu); | |
467 | if (rc) | |
468 | goto out; | |
469 | cpu_maps_update_begin(); | |
470 | break; | |
471 | ||
472 | } | |
473 | ||
474 | /* | |
475 | * The cpu is in CPU_STATE_INACTIVE. | |
476 | * Upgrade it's state to CPU_STATE_OFFLINE. | |
477 | */ | |
478 | set_preferred_offline_state(cpu, CPU_STATE_OFFLINE); | |
479 | BUG_ON(plpar_hcall_norets(H_PROD, intserv[i]) | |
480 | != H_SUCCESS); | |
481 | __cpu_die(cpu); | |
482 | break; | |
483 | } | |
484 | if (cpu == num_possible_cpus()) | |
485 | printk(KERN_WARNING "Could not find cpu to offline " | |
486 | "with physical id 0x%x\n", intserv[i]); | |
487 | } | |
488 | cpu_maps_update_done(); | |
489 | ||
490 | out: | |
491 | return rc; | |
492 | ||
493 | } | |
494 | ||
1a8061c4 NF |
495 | static ssize_t dlpar_cpu_release(const char *buf, size_t count) |
496 | { | |
497 | struct device_node *dn; | |
498 | const u32 *drc_index; | |
499 | int rc; | |
500 | ||
501 | dn = of_find_node_by_path(buf); | |
502 | if (!dn) | |
503 | return -EINVAL; | |
504 | ||
505 | drc_index = of_get_property(dn, "ibm,my-drc-index", NULL); | |
506 | if (!drc_index) { | |
507 | of_node_put(dn); | |
508 | return -EINVAL; | |
509 | } | |
510 | ||
275a64f6 | 511 | rc = dlpar_offline_cpu(dn); |
b6db63d1 GS |
512 | if (rc) { |
513 | of_node_put(dn); | |
6dedcca6 | 514 | return -EINVAL; |
b6db63d1 GS |
515 | } |
516 | ||
1a8061c4 NF |
517 | rc = dlpar_release_drc(*drc_index); |
518 | if (rc) { | |
519 | of_node_put(dn); | |
6dedcca6 | 520 | return rc; |
1a8061c4 NF |
521 | } |
522 | ||
523 | rc = dlpar_detach_node(dn); | |
524 | if (rc) { | |
525 | dlpar_acquire_drc(*drc_index); | |
6dedcca6 | 526 | return rc; |
1a8061c4 NF |
527 | } |
528 | ||
529 | of_node_put(dn); | |
6dedcca6 TK |
530 | |
531 | return count; | |
1a8061c4 NF |
532 | } |
533 | ||
534 | static int __init pseries_dlpar_init(void) | |
535 | { | |
536 | ppc_md.cpu_probe = dlpar_cpu_probe; | |
537 | ppc_md.cpu_release = dlpar_cpu_release; | |
538 | ||
539 | return 0; | |
540 | } | |
541 | machine_device_initcall(pseries, pseries_dlpar_init); | |
542 | ||
543 | #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */ |