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e450992d DM |
1 | /* ds.c: Domain Services driver for Logical Domains |
2 | * | |
3 | * Copyright (C) 2007 David S. Miller <davem@davemloft.net> | |
4 | */ | |
5 | ||
6 | #include <linux/kernel.h> | |
7 | #include <linux/module.h> | |
8 | #include <linux/types.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/string.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/sched.h> | |
13 | #include <linux/delay.h> | |
b3e13fbe | 14 | #include <linux/mutex.h> |
bd0e11ff | 15 | #include <linux/kthread.h> |
4f0234f4 | 16 | #include <linux/cpu.h> |
e450992d DM |
17 | |
18 | #include <asm/ldc.h> | |
19 | #include <asm/vio.h> | |
20 | #include <asm/power.h> | |
43fdf274 | 21 | #include <asm/mdesc.h> |
4f0234f4 | 22 | #include <asm/head.h> |
e0204409 | 23 | #include <asm/irq.h> |
e450992d DM |
24 | |
25 | #define DRV_MODULE_NAME "ds" | |
26 | #define PFX DRV_MODULE_NAME ": " | |
27 | #define DRV_MODULE_VERSION "1.0" | |
28 | #define DRV_MODULE_RELDATE "Jul 11, 2007" | |
29 | ||
30 | static char version[] __devinitdata = | |
31 | DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; | |
32 | MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); | |
33 | MODULE_DESCRIPTION("Sun LDOM domain services driver"); | |
34 | MODULE_LICENSE("GPL"); | |
35 | MODULE_VERSION(DRV_MODULE_VERSION); | |
36 | ||
37 | struct ds_msg_tag { | |
38 | __u32 type; | |
39 | #define DS_INIT_REQ 0x00 | |
40 | #define DS_INIT_ACK 0x01 | |
41 | #define DS_INIT_NACK 0x02 | |
42 | #define DS_REG_REQ 0x03 | |
43 | #define DS_REG_ACK 0x04 | |
44 | #define DS_REG_NACK 0x05 | |
45 | #define DS_UNREG_REQ 0x06 | |
46 | #define DS_UNREG_ACK 0x07 | |
47 | #define DS_UNREG_NACK 0x08 | |
48 | #define DS_DATA 0x09 | |
49 | #define DS_NACK 0x0a | |
50 | ||
51 | __u32 len; | |
52 | }; | |
53 | ||
54 | /* Result codes */ | |
55 | #define DS_OK 0x00 | |
56 | #define DS_REG_VER_NACK 0x01 | |
57 | #define DS_REG_DUP 0x02 | |
58 | #define DS_INV_HDL 0x03 | |
59 | #define DS_TYPE_UNKNOWN 0x04 | |
60 | ||
61 | struct ds_version { | |
62 | __u16 major; | |
63 | __u16 minor; | |
64 | }; | |
65 | ||
66 | struct ds_ver_req { | |
67 | struct ds_msg_tag tag; | |
68 | struct ds_version ver; | |
69 | }; | |
70 | ||
71 | struct ds_ver_ack { | |
72 | struct ds_msg_tag tag; | |
73 | __u16 minor; | |
74 | }; | |
75 | ||
76 | struct ds_ver_nack { | |
77 | struct ds_msg_tag tag; | |
78 | __u16 major; | |
79 | }; | |
80 | ||
81 | struct ds_reg_req { | |
82 | struct ds_msg_tag tag; | |
83 | __u64 handle; | |
84 | __u16 major; | |
85 | __u16 minor; | |
86 | char svc_id[0]; | |
87 | }; | |
88 | ||
89 | struct ds_reg_ack { | |
90 | struct ds_msg_tag tag; | |
91 | __u64 handle; | |
92 | __u16 minor; | |
93 | }; | |
94 | ||
95 | struct ds_reg_nack { | |
96 | struct ds_msg_tag tag; | |
97 | __u64 handle; | |
98 | __u16 major; | |
99 | }; | |
100 | ||
101 | struct ds_unreg_req { | |
102 | struct ds_msg_tag tag; | |
103 | __u64 handle; | |
104 | }; | |
105 | ||
106 | struct ds_unreg_ack { | |
107 | struct ds_msg_tag tag; | |
108 | __u64 handle; | |
109 | }; | |
110 | ||
111 | struct ds_unreg_nack { | |
112 | struct ds_msg_tag tag; | |
113 | __u64 handle; | |
114 | }; | |
115 | ||
116 | struct ds_data { | |
117 | struct ds_msg_tag tag; | |
118 | __u64 handle; | |
119 | }; | |
120 | ||
121 | struct ds_data_nack { | |
122 | struct ds_msg_tag tag; | |
123 | __u64 handle; | |
124 | __u64 result; | |
125 | }; | |
126 | ||
127 | struct ds_cap_state { | |
128 | __u64 handle; | |
129 | ||
130 | void (*data)(struct ldc_channel *lp, | |
4f0234f4 | 131 | struct ds_cap_state *cp, |
e450992d DM |
132 | void *buf, int len); |
133 | ||
134 | const char *service_id; | |
135 | ||
136 | u8 state; | |
137 | #define CAP_STATE_UNKNOWN 0x00 | |
138 | #define CAP_STATE_REG_SENT 0x01 | |
139 | #define CAP_STATE_REGISTERED 0x02 | |
140 | }; | |
141 | ||
4f0234f4 DM |
142 | static void md_update_data(struct ldc_channel *lp, struct ds_cap_state *cp, |
143 | void *buf, int len); | |
144 | static void domain_shutdown_data(struct ldc_channel *lp, | |
145 | struct ds_cap_state *cp, | |
146 | void *buf, int len); | |
147 | static void domain_panic_data(struct ldc_channel *lp, | |
148 | struct ds_cap_state *cp, | |
149 | void *buf, int len); | |
b14f5c10 | 150 | #ifdef CONFIG_HOTPLUG_CPU |
4f0234f4 DM |
151 | static void dr_cpu_data(struct ldc_channel *lp, |
152 | struct ds_cap_state *cp, | |
153 | void *buf, int len); | |
b14f5c10 | 154 | #endif |
4f0234f4 DM |
155 | static void ds_pri_data(struct ldc_channel *lp, |
156 | struct ds_cap_state *cp, | |
157 | void *buf, int len); | |
158 | static void ds_var_data(struct ldc_channel *lp, | |
159 | struct ds_cap_state *cp, | |
160 | void *buf, int len); | |
161 | ||
162 | struct ds_cap_state ds_states[] = { | |
163 | { | |
164 | .service_id = "md-update", | |
165 | .data = md_update_data, | |
166 | }, | |
167 | { | |
168 | .service_id = "domain-shutdown", | |
169 | .data = domain_shutdown_data, | |
170 | }, | |
171 | { | |
172 | .service_id = "domain-panic", | |
173 | .data = domain_panic_data, | |
174 | }, | |
b14f5c10 | 175 | #ifdef CONFIG_HOTPLUG_CPU |
4f0234f4 DM |
176 | { |
177 | .service_id = "dr-cpu", | |
178 | .data = dr_cpu_data, | |
179 | }, | |
b14f5c10 | 180 | #endif |
4f0234f4 DM |
181 | { |
182 | .service_id = "pri", | |
183 | .data = ds_pri_data, | |
184 | }, | |
185 | { | |
186 | .service_id = "var-config", | |
187 | .data = ds_var_data, | |
188 | }, | |
189 | { | |
190 | .service_id = "var-config-backup", | |
191 | .data = ds_var_data, | |
192 | }, | |
193 | }; | |
194 | ||
195 | static DEFINE_SPINLOCK(ds_lock); | |
196 | ||
197 | struct ds_info { | |
198 | struct ldc_channel *lp; | |
199 | u8 hs_state; | |
200 | #define DS_HS_START 0x01 | |
201 | #define DS_HS_DONE 0x02 | |
202 | ||
203 | void *rcv_buf; | |
204 | int rcv_buf_len; | |
205 | }; | |
206 | ||
207 | static struct ds_info *ds_info; | |
208 | ||
209 | static struct ds_cap_state *find_cap(u64 handle) | |
210 | { | |
211 | unsigned int index = handle >> 32; | |
212 | ||
213 | if (index >= ARRAY_SIZE(ds_states)) | |
214 | return NULL; | |
215 | return &ds_states[index]; | |
216 | } | |
217 | ||
218 | static struct ds_cap_state *find_cap_by_string(const char *name) | |
219 | { | |
220 | int i; | |
221 | ||
222 | for (i = 0; i < ARRAY_SIZE(ds_states); i++) { | |
223 | if (strcmp(ds_states[i].service_id, name)) | |
224 | continue; | |
225 | ||
226 | return &ds_states[i]; | |
227 | } | |
228 | return NULL; | |
229 | } | |
230 | ||
e450992d DM |
231 | static int ds_send(struct ldc_channel *lp, void *data, int len) |
232 | { | |
233 | int err, limit = 1000; | |
234 | ||
235 | err = -EINVAL; | |
236 | while (limit-- > 0) { | |
237 | err = ldc_write(lp, data, len); | |
238 | if (!err || (err != -EAGAIN)) | |
239 | break; | |
240 | udelay(1); | |
241 | } | |
242 | ||
243 | return err; | |
244 | } | |
245 | ||
246 | struct ds_md_update_req { | |
247 | __u64 req_num; | |
248 | }; | |
249 | ||
250 | struct ds_md_update_res { | |
251 | __u64 req_num; | |
252 | __u32 result; | |
253 | }; | |
254 | ||
255 | static void md_update_data(struct ldc_channel *lp, | |
256 | struct ds_cap_state *dp, | |
257 | void *buf, int len) | |
258 | { | |
259 | struct ds_data *dpkt = buf; | |
260 | struct ds_md_update_req *rp; | |
261 | struct { | |
262 | struct ds_data data; | |
263 | struct ds_md_update_res res; | |
264 | } pkt; | |
265 | ||
266 | rp = (struct ds_md_update_req *) (dpkt + 1); | |
267 | ||
b3e13fbe | 268 | printk(KERN_INFO PFX "Machine description update.\n"); |
e450992d DM |
269 | |
270 | memset(&pkt, 0, sizeof(pkt)); | |
271 | pkt.data.tag.type = DS_DATA; | |
272 | pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag); | |
273 | pkt.data.handle = dp->handle; | |
274 | pkt.res.req_num = rp->req_num; | |
275 | pkt.res.result = DS_OK; | |
276 | ||
277 | ds_send(lp, &pkt, sizeof(pkt)); | |
43fdf274 DM |
278 | |
279 | mdesc_update(); | |
e450992d DM |
280 | } |
281 | ||
282 | struct ds_shutdown_req { | |
283 | __u64 req_num; | |
284 | __u32 ms_delay; | |
285 | }; | |
286 | ||
287 | struct ds_shutdown_res { | |
288 | __u64 req_num; | |
289 | __u32 result; | |
290 | char reason[1]; | |
291 | }; | |
292 | ||
293 | static void domain_shutdown_data(struct ldc_channel *lp, | |
294 | struct ds_cap_state *dp, | |
295 | void *buf, int len) | |
296 | { | |
297 | struct ds_data *dpkt = buf; | |
298 | struct ds_shutdown_req *rp; | |
299 | struct { | |
300 | struct ds_data data; | |
301 | struct ds_shutdown_res res; | |
302 | } pkt; | |
303 | ||
304 | rp = (struct ds_shutdown_req *) (dpkt + 1); | |
305 | ||
306 | printk(KERN_ALERT PFX "Shutdown request from " | |
307 | "LDOM manager received.\n"); | |
308 | ||
309 | memset(&pkt, 0, sizeof(pkt)); | |
310 | pkt.data.tag.type = DS_DATA; | |
311 | pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag); | |
312 | pkt.data.handle = dp->handle; | |
313 | pkt.res.req_num = rp->req_num; | |
314 | pkt.res.result = DS_OK; | |
315 | pkt.res.reason[0] = 0; | |
316 | ||
317 | ds_send(lp, &pkt, sizeof(pkt)); | |
318 | ||
319 | wake_up_powerd(); | |
320 | } | |
321 | ||
322 | struct ds_panic_req { | |
323 | __u64 req_num; | |
324 | }; | |
325 | ||
326 | struct ds_panic_res { | |
327 | __u64 req_num; | |
328 | __u32 result; | |
329 | char reason[1]; | |
330 | }; | |
331 | ||
332 | static void domain_panic_data(struct ldc_channel *lp, | |
333 | struct ds_cap_state *dp, | |
334 | void *buf, int len) | |
335 | { | |
336 | struct ds_data *dpkt = buf; | |
337 | struct ds_panic_req *rp; | |
338 | struct { | |
339 | struct ds_data data; | |
340 | struct ds_panic_res res; | |
341 | } pkt; | |
342 | ||
343 | rp = (struct ds_panic_req *) (dpkt + 1); | |
344 | ||
b3e13fbe DM |
345 | printk(KERN_ALERT PFX "Panic request from " |
346 | "LDOM manager received.\n"); | |
e450992d DM |
347 | |
348 | memset(&pkt, 0, sizeof(pkt)); | |
349 | pkt.data.tag.type = DS_DATA; | |
350 | pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag); | |
351 | pkt.data.handle = dp->handle; | |
352 | pkt.res.req_num = rp->req_num; | |
353 | pkt.res.result = DS_OK; | |
354 | pkt.res.reason[0] = 0; | |
355 | ||
356 | ds_send(lp, &pkt, sizeof(pkt)); | |
357 | ||
358 | panic("PANIC requested by LDOM manager."); | |
359 | } | |
360 | ||
b14f5c10 | 361 | #ifdef CONFIG_HOTPLUG_CPU |
4f0234f4 | 362 | struct dr_cpu_tag { |
e450992d DM |
363 | __u64 req_num; |
364 | __u32 type; | |
4f0234f4 DM |
365 | #define DR_CPU_CONFIGURE 0x43 |
366 | #define DR_CPU_UNCONFIGURE 0x55 | |
367 | #define DR_CPU_FORCE_UNCONFIGURE 0x46 | |
368 | #define DR_CPU_STATUS 0x53 | |
e450992d DM |
369 | |
370 | /* Responses */ | |
4f0234f4 DM |
371 | #define DR_CPU_OK 0x6f |
372 | #define DR_CPU_ERROR 0x65 | |
e450992d DM |
373 | |
374 | __u32 num_records; | |
375 | }; | |
376 | ||
4f0234f4 DM |
377 | struct dr_cpu_resp_entry { |
378 | __u32 cpu; | |
379 | __u32 result; | |
380 | #define DR_CPU_RES_OK 0x00 | |
381 | #define DR_CPU_RES_FAILURE 0x01 | |
382 | #define DR_CPU_RES_BLOCKED 0x02 | |
383 | #define DR_CPU_RES_CPU_NOT_RESPONDING 0x03 | |
384 | #define DR_CPU_RES_NOT_IN_MD 0x04 | |
385 | ||
386 | __u32 stat; | |
387 | #define DR_CPU_STAT_NOT_PRESENT 0x00 | |
388 | #define DR_CPU_STAT_UNCONFIGURED 0x01 | |
389 | #define DR_CPU_STAT_CONFIGURED 0x02 | |
390 | ||
391 | __u32 str_off; | |
e450992d DM |
392 | }; |
393 | ||
4f0234f4 DM |
394 | /* DR cpu requests get queued onto the work list by the |
395 | * dr_cpu_data() callback. The list is protected by | |
396 | * ds_lock, and processed by dr_cpu_process() in order. | |
397 | */ | |
398 | static LIST_HEAD(dr_cpu_work_list); | |
bd0e11ff | 399 | static DECLARE_WAIT_QUEUE_HEAD(dr_cpu_wait); |
4f0234f4 DM |
400 | |
401 | struct dr_cpu_queue_entry { | |
402 | struct list_head list; | |
403 | char req[0]; | |
404 | }; | |
405 | ||
406 | static void __dr_cpu_send_error(struct ds_cap_state *cp, struct ds_data *data) | |
407 | { | |
408 | struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1); | |
409 | struct ds_info *dp = ds_info; | |
410 | struct { | |
411 | struct ds_data data; | |
412 | struct dr_cpu_tag tag; | |
413 | } pkt; | |
414 | int msg_len; | |
415 | ||
416 | memset(&pkt, 0, sizeof(pkt)); | |
417 | pkt.data.tag.type = DS_DATA; | |
418 | pkt.data.handle = cp->handle; | |
419 | pkt.tag.req_num = tag->req_num; | |
420 | pkt.tag.type = DR_CPU_ERROR; | |
421 | pkt.tag.num_records = 0; | |
422 | ||
423 | msg_len = (sizeof(struct ds_data) + | |
424 | sizeof(struct dr_cpu_tag)); | |
425 | ||
426 | pkt.data.tag.len = msg_len - sizeof(struct ds_msg_tag); | |
427 | ||
428 | ds_send(dp->lp, &pkt, msg_len); | |
429 | } | |
430 | ||
431 | static void dr_cpu_send_error(struct ds_cap_state *cp, struct ds_data *data) | |
432 | { | |
433 | unsigned long flags; | |
434 | ||
435 | spin_lock_irqsave(&ds_lock, flags); | |
436 | __dr_cpu_send_error(cp, data); | |
437 | spin_unlock_irqrestore(&ds_lock, flags); | |
438 | } | |
439 | ||
440 | #define CPU_SENTINEL 0xffffffff | |
441 | ||
442 | static void purge_dups(u32 *list, u32 num_ents) | |
443 | { | |
444 | unsigned int i; | |
445 | ||
446 | for (i = 0; i < num_ents; i++) { | |
447 | u32 cpu = list[i]; | |
448 | unsigned int j; | |
449 | ||
450 | if (cpu == CPU_SENTINEL) | |
451 | continue; | |
452 | ||
453 | for (j = i + 1; j < num_ents; j++) { | |
454 | if (list[j] == cpu) | |
455 | list[j] = CPU_SENTINEL; | |
456 | } | |
457 | } | |
458 | } | |
459 | ||
460 | static int dr_cpu_size_response(int ncpus) | |
461 | { | |
462 | return (sizeof(struct ds_data) + | |
463 | sizeof(struct dr_cpu_tag) + | |
464 | (sizeof(struct dr_cpu_resp_entry) * ncpus)); | |
465 | } | |
466 | ||
467 | static void dr_cpu_init_response(struct ds_data *resp, u64 req_num, | |
468 | u64 handle, int resp_len, int ncpus, | |
469 | cpumask_t *mask, u32 default_stat) | |
470 | { | |
471 | struct dr_cpu_resp_entry *ent; | |
472 | struct dr_cpu_tag *tag; | |
473 | int i, cpu; | |
474 | ||
475 | tag = (struct dr_cpu_tag *) (resp + 1); | |
476 | ent = (struct dr_cpu_resp_entry *) (tag + 1); | |
477 | ||
478 | resp->tag.type = DS_DATA; | |
479 | resp->tag.len = resp_len - sizeof(struct ds_msg_tag); | |
480 | resp->handle = handle; | |
481 | tag->req_num = req_num; | |
482 | tag->type = DR_CPU_OK; | |
483 | tag->num_records = ncpus; | |
484 | ||
485 | i = 0; | |
486 | for_each_cpu_mask(cpu, *mask) { | |
487 | ent[i].cpu = cpu; | |
488 | ent[i].result = DR_CPU_RES_OK; | |
489 | ent[i].stat = default_stat; | |
490 | i++; | |
491 | } | |
492 | BUG_ON(i != ncpus); | |
493 | } | |
494 | ||
495 | static void dr_cpu_mark(struct ds_data *resp, int cpu, int ncpus, | |
496 | u32 res, u32 stat) | |
497 | { | |
498 | struct dr_cpu_resp_entry *ent; | |
499 | struct dr_cpu_tag *tag; | |
500 | int i; | |
501 | ||
502 | tag = (struct dr_cpu_tag *) (resp + 1); | |
503 | ent = (struct dr_cpu_resp_entry *) (tag + 1); | |
504 | ||
505 | for (i = 0; i < ncpus; i++) { | |
506 | if (ent[i].cpu != cpu) | |
507 | continue; | |
508 | ent[i].result = res; | |
509 | ent[i].stat = stat; | |
510 | break; | |
511 | } | |
512 | } | |
513 | ||
514 | static int dr_cpu_configure(struct ds_cap_state *cp, u64 req_num, | |
515 | cpumask_t *mask) | |
516 | { | |
517 | struct ds_data *resp; | |
518 | int resp_len, ncpus, cpu; | |
519 | unsigned long flags; | |
520 | ||
521 | ncpus = cpus_weight(*mask); | |
522 | resp_len = dr_cpu_size_response(ncpus); | |
523 | resp = kzalloc(resp_len, GFP_KERNEL); | |
524 | if (!resp) | |
525 | return -ENOMEM; | |
526 | ||
527 | dr_cpu_init_response(resp, req_num, cp->handle, | |
528 | resp_len, ncpus, mask, | |
529 | DR_CPU_STAT_CONFIGURED); | |
530 | ||
531 | mdesc_fill_in_cpu_data(*mask); | |
532 | ||
533 | for_each_cpu_mask(cpu, *mask) { | |
534 | int err; | |
535 | ||
536 | printk(KERN_INFO PFX "Starting cpu %d...\n", cpu); | |
537 | err = cpu_up(cpu); | |
bd0e11ff | 538 | if (err) { |
9918cc2e DM |
539 | __u32 res = DR_CPU_RES_FAILURE; |
540 | __u32 stat = DR_CPU_STAT_UNCONFIGURED; | |
541 | ||
542 | if (!cpu_present(cpu)) { | |
543 | /* CPU not present in MD */ | |
544 | res = DR_CPU_RES_NOT_IN_MD; | |
545 | stat = DR_CPU_STAT_NOT_PRESENT; | |
546 | } else if (err == -ENODEV) { | |
547 | /* CPU did not call in successfully */ | |
548 | res = DR_CPU_RES_CPU_NOT_RESPONDING; | |
549 | } | |
550 | ||
bd0e11ff DM |
551 | printk(KERN_INFO PFX "CPU startup failed err=%d\n", |
552 | err); | |
9918cc2e | 553 | dr_cpu_mark(resp, cpu, ncpus, res, stat); |
bd0e11ff | 554 | } |
4f0234f4 DM |
555 | } |
556 | ||
557 | spin_lock_irqsave(&ds_lock, flags); | |
558 | ds_send(ds_info->lp, resp, resp_len); | |
559 | spin_unlock_irqrestore(&ds_lock, flags); | |
560 | ||
561 | kfree(resp); | |
562 | ||
e0204409 DM |
563 | /* Redistribute IRQs, taking into account the new cpus. */ |
564 | fixup_irqs(); | |
565 | ||
4f0234f4 DM |
566 | return 0; |
567 | } | |
568 | ||
569 | static int dr_cpu_unconfigure(struct ds_cap_state *cp, u64 req_num, | |
570 | cpumask_t *mask) | |
571 | { | |
572 | struct ds_data *resp; | |
e0204409 DM |
573 | int resp_len, ncpus, cpu; |
574 | unsigned long flags; | |
4f0234f4 DM |
575 | |
576 | ncpus = cpus_weight(*mask); | |
577 | resp_len = dr_cpu_size_response(ncpus); | |
578 | resp = kzalloc(resp_len, GFP_KERNEL); | |
579 | if (!resp) | |
580 | return -ENOMEM; | |
581 | ||
582 | dr_cpu_init_response(resp, req_num, cp->handle, | |
583 | resp_len, ncpus, mask, | |
584 | DR_CPU_STAT_UNCONFIGURED); | |
585 | ||
e0204409 DM |
586 | for_each_cpu_mask(cpu, *mask) { |
587 | int err; | |
588 | ||
589 | printk(KERN_INFO PFX "CPU[%d]: Shutting down cpu %d...\n", | |
590 | smp_processor_id(), cpu); | |
591 | err = cpu_down(cpu); | |
592 | if (err) | |
593 | dr_cpu_mark(resp, cpu, ncpus, | |
594 | DR_CPU_RES_FAILURE, | |
595 | DR_CPU_STAT_CONFIGURED); | |
596 | } | |
597 | ||
598 | spin_lock_irqsave(&ds_lock, flags); | |
599 | ds_send(ds_info->lp, resp, resp_len); | |
600 | spin_unlock_irqrestore(&ds_lock, flags); | |
601 | ||
4f0234f4 DM |
602 | kfree(resp); |
603 | ||
e0204409 | 604 | return 0; |
4f0234f4 DM |
605 | } |
606 | ||
bd0e11ff | 607 | static void process_dr_cpu_list(struct ds_cap_state *cp) |
4f0234f4 DM |
608 | { |
609 | struct dr_cpu_queue_entry *qp, *tmp; | |
4f0234f4 DM |
610 | unsigned long flags; |
611 | LIST_HEAD(todo); | |
612 | cpumask_t mask; | |
613 | ||
4f0234f4 DM |
614 | spin_lock_irqsave(&ds_lock, flags); |
615 | list_splice(&dr_cpu_work_list, &todo); | |
bd0e11ff | 616 | INIT_LIST_HEAD(&dr_cpu_work_list); |
4f0234f4 DM |
617 | spin_unlock_irqrestore(&ds_lock, flags); |
618 | ||
619 | list_for_each_entry_safe(qp, tmp, &todo, list) { | |
620 | struct ds_data *data = (struct ds_data *) qp->req; | |
621 | struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1); | |
622 | u32 *cpu_list = (u32 *) (tag + 1); | |
623 | u64 req_num = tag->req_num; | |
624 | unsigned int i; | |
625 | int err; | |
626 | ||
627 | switch (tag->type) { | |
628 | case DR_CPU_CONFIGURE: | |
629 | case DR_CPU_UNCONFIGURE: | |
630 | case DR_CPU_FORCE_UNCONFIGURE: | |
631 | break; | |
632 | ||
633 | default: | |
634 | dr_cpu_send_error(cp, data); | |
635 | goto next; | |
636 | } | |
637 | ||
638 | purge_dups(cpu_list, tag->num_records); | |
639 | ||
640 | cpus_clear(mask); | |
641 | for (i = 0; i < tag->num_records; i++) { | |
642 | if (cpu_list[i] == CPU_SENTINEL) | |
643 | continue; | |
644 | ||
645 | if (cpu_list[i] < NR_CPUS) | |
646 | cpu_set(cpu_list[i], mask); | |
647 | } | |
648 | ||
649 | if (tag->type == DR_CPU_CONFIGURE) | |
650 | err = dr_cpu_configure(cp, req_num, &mask); | |
651 | else | |
652 | err = dr_cpu_unconfigure(cp, req_num, &mask); | |
653 | ||
654 | if (err) | |
655 | dr_cpu_send_error(cp, data); | |
656 | ||
657 | next: | |
658 | list_del(&qp->list); | |
659 | kfree(qp); | |
660 | } | |
661 | } | |
662 | ||
bd0e11ff DM |
663 | static int dr_cpu_thread(void *__unused) |
664 | { | |
665 | struct ds_cap_state *cp; | |
666 | DEFINE_WAIT(wait); | |
667 | ||
668 | cp = find_cap_by_string("dr-cpu"); | |
669 | ||
670 | while (1) { | |
671 | prepare_to_wait(&dr_cpu_wait, &wait, TASK_INTERRUPTIBLE); | |
672 | if (list_empty(&dr_cpu_work_list)) | |
673 | schedule(); | |
674 | finish_wait(&dr_cpu_wait, &wait); | |
675 | ||
676 | if (kthread_should_stop()) | |
677 | break; | |
678 | ||
679 | process_dr_cpu_list(cp); | |
680 | } | |
681 | ||
682 | return 0; | |
683 | } | |
4f0234f4 | 684 | |
e450992d DM |
685 | static void dr_cpu_data(struct ldc_channel *lp, |
686 | struct ds_cap_state *dp, | |
687 | void *buf, int len) | |
688 | { | |
4f0234f4 | 689 | struct dr_cpu_queue_entry *qp; |
e450992d | 690 | struct ds_data *dpkt = buf; |
4f0234f4 | 691 | struct dr_cpu_tag *rp; |
e450992d | 692 | |
4f0234f4 | 693 | rp = (struct dr_cpu_tag *) (dpkt + 1); |
e450992d | 694 | |
4f0234f4 DM |
695 | qp = kmalloc(sizeof(struct dr_cpu_queue_entry) + len, GFP_ATOMIC); |
696 | if (!qp) { | |
697 | struct ds_cap_state *cp; | |
698 | ||
699 | cp = find_cap_by_string("dr-cpu"); | |
700 | __dr_cpu_send_error(cp, dpkt); | |
701 | } else { | |
702 | memcpy(&qp->req, buf, len); | |
703 | list_add_tail(&qp->list, &dr_cpu_work_list); | |
bd0e11ff | 704 | wake_up(&dr_cpu_wait); |
4f0234f4 | 705 | } |
e450992d | 706 | } |
b14f5c10 | 707 | #endif |
e450992d DM |
708 | |
709 | struct ds_pri_msg { | |
710 | __u64 req_num; | |
711 | __u64 type; | |
712 | #define DS_PRI_REQUEST 0x00 | |
713 | #define DS_PRI_DATA 0x01 | |
714 | #define DS_PRI_UPDATE 0x02 | |
715 | }; | |
716 | ||
717 | static void ds_pri_data(struct ldc_channel *lp, | |
718 | struct ds_cap_state *dp, | |
719 | void *buf, int len) | |
720 | { | |
721 | struct ds_data *dpkt = buf; | |
722 | struct ds_pri_msg *rp; | |
723 | ||
724 | rp = (struct ds_pri_msg *) (dpkt + 1); | |
725 | ||
b3e13fbe | 726 | printk(KERN_INFO PFX "PRI REQ [%lx:%lx], len=%d\n", |
e450992d DM |
727 | rp->req_num, rp->type, len); |
728 | } | |
729 | ||
b3e13fbe DM |
730 | struct ds_var_hdr { |
731 | __u32 type; | |
732 | #define DS_VAR_SET_REQ 0x00 | |
733 | #define DS_VAR_DELETE_REQ 0x01 | |
734 | #define DS_VAR_SET_RESP 0x02 | |
735 | #define DS_VAR_DELETE_RESP 0x03 | |
736 | }; | |
737 | ||
738 | struct ds_var_set_msg { | |
739 | struct ds_var_hdr hdr; | |
740 | char name_and_value[0]; | |
741 | }; | |
742 | ||
743 | struct ds_var_delete_msg { | |
744 | struct ds_var_hdr hdr; | |
745 | char name[0]; | |
746 | }; | |
747 | ||
748 | struct ds_var_resp { | |
749 | struct ds_var_hdr hdr; | |
750 | __u32 result; | |
751 | #define DS_VAR_SUCCESS 0x00 | |
752 | #define DS_VAR_NO_SPACE 0x01 | |
753 | #define DS_VAR_INVALID_VAR 0x02 | |
754 | #define DS_VAR_INVALID_VAL 0x03 | |
755 | #define DS_VAR_NOT_PRESENT 0x04 | |
756 | }; | |
757 | ||
758 | static DEFINE_MUTEX(ds_var_mutex); | |
759 | static int ds_var_doorbell; | |
760 | static int ds_var_response; | |
761 | ||
762 | static void ds_var_data(struct ldc_channel *lp, | |
763 | struct ds_cap_state *dp, | |
764 | void *buf, int len) | |
765 | { | |
766 | struct ds_data *dpkt = buf; | |
767 | struct ds_var_resp *rp; | |
768 | ||
769 | rp = (struct ds_var_resp *) (dpkt + 1); | |
770 | ||
771 | if (rp->hdr.type != DS_VAR_SET_RESP && | |
772 | rp->hdr.type != DS_VAR_DELETE_RESP) | |
773 | return; | |
774 | ||
775 | ds_var_response = rp->result; | |
776 | wmb(); | |
777 | ds_var_doorbell = 1; | |
778 | } | |
779 | ||
b3e13fbe DM |
780 | void ldom_set_var(const char *var, const char *value) |
781 | { | |
782 | struct ds_info *dp = ds_info; | |
783 | struct ds_cap_state *cp; | |
784 | ||
785 | cp = find_cap_by_string("var-config"); | |
786 | if (cp->state != CAP_STATE_REGISTERED) | |
787 | cp = find_cap_by_string("var-config-backup"); | |
788 | ||
789 | if (cp->state == CAP_STATE_REGISTERED) { | |
790 | union { | |
791 | struct { | |
792 | struct ds_data data; | |
793 | struct ds_var_set_msg msg; | |
794 | } header; | |
795 | char all[512]; | |
796 | } pkt; | |
797 | unsigned long flags; | |
798 | char *base, *p; | |
799 | int msg_len, loops; | |
800 | ||
801 | memset(&pkt, 0, sizeof(pkt)); | |
802 | pkt.header.data.tag.type = DS_DATA; | |
803 | pkt.header.data.handle = cp->handle; | |
804 | pkt.header.msg.hdr.type = DS_VAR_SET_REQ; | |
805 | base = p = &pkt.header.msg.name_and_value[0]; | |
806 | strcpy(p, var); | |
807 | p += strlen(var) + 1; | |
808 | strcpy(p, value); | |
809 | p += strlen(value) + 1; | |
810 | ||
811 | msg_len = (sizeof(struct ds_data) + | |
4f0234f4 DM |
812 | sizeof(struct ds_var_set_msg) + |
813 | (p - base)); | |
b3e13fbe DM |
814 | msg_len = (msg_len + 3) & ~3; |
815 | pkt.header.data.tag.len = msg_len - sizeof(struct ds_msg_tag); | |
816 | ||
817 | mutex_lock(&ds_var_mutex); | |
818 | ||
819 | spin_lock_irqsave(&ds_lock, flags); | |
820 | ds_var_doorbell = 0; | |
821 | ds_var_response = -1; | |
822 | ||
823 | ds_send(dp->lp, &pkt, msg_len); | |
824 | spin_unlock_irqrestore(&ds_lock, flags); | |
825 | ||
826 | loops = 1000; | |
827 | while (ds_var_doorbell == 0) { | |
828 | if (loops-- < 0) | |
829 | break; | |
830 | barrier(); | |
831 | udelay(100); | |
832 | } | |
833 | ||
834 | mutex_unlock(&ds_var_mutex); | |
835 | ||
836 | if (ds_var_doorbell == 0 || | |
837 | ds_var_response != DS_VAR_SUCCESS) | |
838 | printk(KERN_ERR PFX "var-config [%s:%s] " | |
839 | "failed, response(%d).\n", | |
840 | var, value, | |
841 | ds_var_response); | |
842 | } else { | |
843 | printk(KERN_ERR PFX "var-config not registered so " | |
844 | "could not set (%s) variable to (%s).\n", | |
845 | var, value); | |
846 | } | |
847 | } | |
848 | ||
849 | void ldom_reboot(const char *boot_command) | |
850 | { | |
851 | /* Don't bother with any of this if the boot_command | |
852 | * is empty. | |
853 | */ | |
854 | if (boot_command && strlen(boot_command)) { | |
855 | char full_boot_str[256]; | |
856 | ||
857 | strcpy(full_boot_str, "boot "); | |
858 | strcpy(full_boot_str + strlen("boot "), boot_command); | |
859 | ||
860 | ldom_set_var("reboot-command", full_boot_str); | |
861 | } | |
862 | sun4v_mach_sir(); | |
863 | } | |
864 | ||
4f0234f4 DM |
865 | void ldom_power_off(void) |
866 | { | |
867 | sun4v_mach_exit(0); | |
868 | } | |
869 | ||
e450992d DM |
870 | static void ds_conn_reset(struct ds_info *dp) |
871 | { | |
872 | printk(KERN_ERR PFX "ds_conn_reset() from %p\n", | |
873 | __builtin_return_address(0)); | |
874 | } | |
875 | ||
876 | static int register_services(struct ds_info *dp) | |
877 | { | |
878 | struct ldc_channel *lp = dp->lp; | |
879 | int i; | |
880 | ||
881 | for (i = 0; i < ARRAY_SIZE(ds_states); i++) { | |
882 | struct { | |
883 | struct ds_reg_req req; | |
884 | u8 id_buf[256]; | |
885 | } pbuf; | |
886 | struct ds_cap_state *cp = &ds_states[i]; | |
887 | int err, msg_len; | |
888 | u64 new_count; | |
889 | ||
890 | if (cp->state == CAP_STATE_REGISTERED) | |
891 | continue; | |
892 | ||
893 | new_count = sched_clock() & 0xffffffff; | |
894 | cp->handle = ((u64) i << 32) | new_count; | |
895 | ||
896 | msg_len = (sizeof(struct ds_reg_req) + | |
897 | strlen(cp->service_id)); | |
898 | ||
899 | memset(&pbuf, 0, sizeof(pbuf)); | |
900 | pbuf.req.tag.type = DS_REG_REQ; | |
901 | pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag)); | |
902 | pbuf.req.handle = cp->handle; | |
903 | pbuf.req.major = 1; | |
904 | pbuf.req.minor = 0; | |
905 | strcpy(pbuf.req.svc_id, cp->service_id); | |
906 | ||
907 | err = ds_send(lp, &pbuf, msg_len); | |
908 | if (err > 0) | |
909 | cp->state = CAP_STATE_REG_SENT; | |
910 | } | |
911 | return 0; | |
912 | } | |
913 | ||
914 | static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt) | |
915 | { | |
916 | ||
917 | if (dp->hs_state == DS_HS_START) { | |
918 | if (pkt->type != DS_INIT_ACK) | |
919 | goto conn_reset; | |
920 | ||
921 | dp->hs_state = DS_HS_DONE; | |
922 | ||
923 | return register_services(dp); | |
924 | } | |
925 | ||
926 | if (dp->hs_state != DS_HS_DONE) | |
927 | goto conn_reset; | |
928 | ||
929 | if (pkt->type == DS_REG_ACK) { | |
930 | struct ds_reg_ack *ap = (struct ds_reg_ack *) pkt; | |
931 | struct ds_cap_state *cp = find_cap(ap->handle); | |
932 | ||
933 | if (!cp) { | |
934 | printk(KERN_ERR PFX "REG ACK for unknown handle %lx\n", | |
935 | ap->handle); | |
936 | return 0; | |
937 | } | |
938 | printk(KERN_INFO PFX "Registered %s service.\n", | |
939 | cp->service_id); | |
940 | cp->state = CAP_STATE_REGISTERED; | |
941 | } else if (pkt->type == DS_REG_NACK) { | |
942 | struct ds_reg_nack *np = (struct ds_reg_nack *) pkt; | |
943 | struct ds_cap_state *cp = find_cap(np->handle); | |
944 | ||
945 | if (!cp) { | |
946 | printk(KERN_ERR PFX "REG NACK for " | |
947 | "unknown handle %lx\n", | |
948 | np->handle); | |
949 | return 0; | |
950 | } | |
4f0234f4 | 951 | printk(KERN_INFO PFX "Could not register %s service\n", |
e450992d DM |
952 | cp->service_id); |
953 | cp->state = CAP_STATE_UNKNOWN; | |
954 | } | |
955 | ||
956 | return 0; | |
957 | ||
958 | conn_reset: | |
959 | ds_conn_reset(dp); | |
960 | return -ECONNRESET; | |
961 | } | |
962 | ||
963 | static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len) | |
964 | { | |
965 | struct ds_data *dpkt = (struct ds_data *) pkt; | |
966 | struct ds_cap_state *cp = find_cap(dpkt->handle); | |
967 | ||
968 | if (!cp) { | |
969 | struct ds_data_nack nack = { | |
970 | .tag = { | |
971 | .type = DS_NACK, | |
972 | .len = (sizeof(struct ds_data_nack) - | |
973 | sizeof(struct ds_msg_tag)), | |
974 | }, | |
975 | .handle = dpkt->handle, | |
976 | .result = DS_INV_HDL, | |
977 | }; | |
978 | ||
979 | printk(KERN_ERR PFX "Data for unknown handle %lu\n", | |
980 | dpkt->handle); | |
981 | ds_send(dp->lp, &nack, sizeof(nack)); | |
982 | } else { | |
983 | cp->data(dp->lp, cp, dpkt, len); | |
984 | } | |
985 | return 0; | |
986 | } | |
987 | ||
988 | static void ds_up(struct ds_info *dp) | |
989 | { | |
990 | struct ldc_channel *lp = dp->lp; | |
991 | struct ds_ver_req req; | |
992 | int err; | |
993 | ||
994 | req.tag.type = DS_INIT_REQ; | |
995 | req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag); | |
996 | req.ver.major = 1; | |
997 | req.ver.minor = 0; | |
998 | ||
999 | err = ds_send(lp, &req, sizeof(req)); | |
1000 | if (err > 0) | |
1001 | dp->hs_state = DS_HS_START; | |
1002 | } | |
1003 | ||
1004 | static void ds_event(void *arg, int event) | |
1005 | { | |
1006 | struct ds_info *dp = arg; | |
1007 | struct ldc_channel *lp = dp->lp; | |
1008 | unsigned long flags; | |
1009 | int err; | |
1010 | ||
1011 | spin_lock_irqsave(&ds_lock, flags); | |
1012 | ||
1013 | if (event == LDC_EVENT_UP) { | |
1014 | ds_up(dp); | |
1015 | spin_unlock_irqrestore(&ds_lock, flags); | |
1016 | return; | |
1017 | } | |
1018 | ||
1019 | if (event != LDC_EVENT_DATA_READY) { | |
1020 | printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event); | |
1021 | spin_unlock_irqrestore(&ds_lock, flags); | |
1022 | return; | |
1023 | } | |
1024 | ||
1025 | err = 0; | |
1026 | while (1) { | |
1027 | struct ds_msg_tag *tag; | |
1028 | ||
1029 | err = ldc_read(lp, dp->rcv_buf, sizeof(*tag)); | |
1030 | ||
1031 | if (unlikely(err < 0)) { | |
1032 | if (err == -ECONNRESET) | |
1033 | ds_conn_reset(dp); | |
1034 | break; | |
1035 | } | |
1036 | if (err == 0) | |
1037 | break; | |
1038 | ||
1039 | tag = dp->rcv_buf; | |
1040 | err = ldc_read(lp, tag + 1, tag->len); | |
1041 | ||
1042 | if (unlikely(err < 0)) { | |
1043 | if (err == -ECONNRESET) | |
1044 | ds_conn_reset(dp); | |
1045 | break; | |
1046 | } | |
1047 | if (err < tag->len) | |
1048 | break; | |
1049 | ||
1050 | if (tag->type < DS_DATA) | |
1051 | err = ds_handshake(dp, dp->rcv_buf); | |
1052 | else | |
1053 | err = ds_data(dp, dp->rcv_buf, | |
1054 | sizeof(*tag) + err); | |
1055 | if (err == -ECONNRESET) | |
1056 | break; | |
1057 | } | |
1058 | ||
1059 | spin_unlock_irqrestore(&ds_lock, flags); | |
1060 | } | |
1061 | ||
1062 | static int __devinit ds_probe(struct vio_dev *vdev, | |
1063 | const struct vio_device_id *id) | |
1064 | { | |
1065 | static int ds_version_printed; | |
e450992d DM |
1066 | struct ldc_channel_config ds_cfg = { |
1067 | .event = ds_event, | |
1068 | .mtu = 4096, | |
1069 | .mode = LDC_MODE_STREAM, | |
1070 | }; | |
1071 | struct ldc_channel *lp; | |
1072 | struct ds_info *dp; | |
e450992d DM |
1073 | int err; |
1074 | ||
1075 | if (ds_version_printed++ == 0) | |
1076 | printk(KERN_INFO "%s", version); | |
1077 | ||
e450992d DM |
1078 | dp = kzalloc(sizeof(*dp), GFP_KERNEL); |
1079 | err = -ENOMEM; | |
1080 | if (!dp) | |
1081 | goto out_err; | |
1082 | ||
1083 | dp->rcv_buf = kzalloc(4096, GFP_KERNEL); | |
1084 | if (!dp->rcv_buf) | |
1085 | goto out_free_dp; | |
1086 | ||
1087 | dp->rcv_buf_len = 4096; | |
1088 | ||
43fdf274 DM |
1089 | ds_cfg.tx_irq = vdev->tx_irq; |
1090 | ds_cfg.rx_irq = vdev->rx_irq; | |
e450992d | 1091 | |
43fdf274 | 1092 | lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp); |
e450992d DM |
1093 | if (IS_ERR(lp)) { |
1094 | err = PTR_ERR(lp); | |
1095 | goto out_free_rcv_buf; | |
1096 | } | |
1097 | dp->lp = lp; | |
1098 | ||
133f09a1 | 1099 | err = ldc_bind(lp, "DS"); |
e450992d DM |
1100 | if (err) |
1101 | goto out_free_ldc; | |
1102 | ||
b3e13fbe DM |
1103 | ds_info = dp; |
1104 | ||
e450992d DM |
1105 | start_powerd(); |
1106 | ||
1107 | return err; | |
1108 | ||
1109 | out_free_ldc: | |
1110 | ldc_free(dp->lp); | |
1111 | ||
1112 | out_free_rcv_buf: | |
1113 | kfree(dp->rcv_buf); | |
1114 | ||
1115 | out_free_dp: | |
1116 | kfree(dp); | |
1117 | ||
1118 | out_err: | |
1119 | return err; | |
1120 | } | |
1121 | ||
1122 | static int ds_remove(struct vio_dev *vdev) | |
1123 | { | |
1124 | return 0; | |
1125 | } | |
1126 | ||
1127 | static struct vio_device_id ds_match[] = { | |
1128 | { | |
1129 | .type = "domain-services-port", | |
1130 | }, | |
1131 | {}, | |
1132 | }; | |
1133 | ||
1134 | static struct vio_driver ds_driver = { | |
1135 | .id_table = ds_match, | |
1136 | .probe = ds_probe, | |
1137 | .remove = ds_remove, | |
1138 | .driver = { | |
1139 | .name = "ds", | |
1140 | .owner = THIS_MODULE, | |
1141 | } | |
1142 | }; | |
1143 | ||
1144 | static int __init ds_init(void) | |
1145 | { | |
1146 | int i; | |
1147 | ||
1148 | for (i = 0; i < ARRAY_SIZE(ds_states); i++) | |
1149 | ds_states[i].handle = ((u64)i << 32); | |
1150 | ||
bd0e11ff DM |
1151 | #ifdef CONFIG_HOTPLUG_CPU |
1152 | kthread_run(dr_cpu_thread, NULL, "kdrcpud"); | |
1153 | #endif | |
1154 | ||
e450992d DM |
1155 | return vio_register_driver(&ds_driver); |
1156 | } | |
1157 | ||
1158 | subsys_initcall(ds_init); |