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[SPARC64]: dr-cpu unconfigure support.
[deliverable/linux.git] / arch / sparc64 / kernel / ds.c
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>
14 #include <linux/mutex.h>
15 #include <linux/kthread.h>
16 #include <linux/cpu.h>
17
18 #include <asm/ldc.h>
19 #include <asm/vio.h>
20 #include <asm/power.h>
21 #include <asm/mdesc.h>
22 #include <asm/head.h>
23 #include <asm/irq.h>
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,
131 struct ds_cap_state *cp,
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
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);
150 #ifdef CONFIG_HOTPLUG_CPU
151 static void dr_cpu_data(struct ldc_channel *lp,
152 struct ds_cap_state *cp,
153 void *buf, int len);
154 #endif
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 },
175 #ifdef CONFIG_HOTPLUG_CPU
176 {
177 .service_id = "dr-cpu",
178 .data = dr_cpu_data,
179 },
180 #endif
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
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
268 printk(KERN_INFO PFX "Machine description update.\n");
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));
278
279 mdesc_update();
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
345 printk(KERN_ALERT PFX "Panic request from "
346 "LDOM manager received.\n");
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
361 #ifdef CONFIG_HOTPLUG_CPU
362 struct dr_cpu_tag {
363 __u64 req_num;
364 __u32 type;
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
369
370 /* Responses */
371 #define DR_CPU_OK 0x6f
372 #define DR_CPU_ERROR 0x65
373
374 __u32 num_records;
375 };
376
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;
392 };
393
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);
399 static DECLARE_WAIT_QUEUE_HEAD(dr_cpu_wait);
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);
538 if (err) {
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
551 printk(KERN_INFO PFX "CPU startup failed err=%d\n",
552 err);
553 dr_cpu_mark(resp, cpu, ncpus, res, stat);
554 }
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
563 /* Redistribute IRQs, taking into account the new cpus. */
564 fixup_irqs();
565
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;
573 int resp_len, ncpus, cpu;
574 unsigned long flags;
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
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
602 kfree(resp);
603
604 return 0;
605 }
606
607 static void process_dr_cpu_list(struct ds_cap_state *cp)
608 {
609 struct dr_cpu_queue_entry *qp, *tmp;
610 unsigned long flags;
611 LIST_HEAD(todo);
612 cpumask_t mask;
613
614 spin_lock_irqsave(&ds_lock, flags);
615 list_splice(&dr_cpu_work_list, &todo);
616 INIT_LIST_HEAD(&dr_cpu_work_list);
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
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 }
684
685 static void dr_cpu_data(struct ldc_channel *lp,
686 struct ds_cap_state *dp,
687 void *buf, int len)
688 {
689 struct dr_cpu_queue_entry *qp;
690 struct ds_data *dpkt = buf;
691 struct dr_cpu_tag *rp;
692
693 rp = (struct dr_cpu_tag *) (dpkt + 1);
694
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);
704 wake_up(&dr_cpu_wait);
705 }
706 }
707 #endif
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
726 printk(KERN_INFO PFX "PRI REQ [%lx:%lx], len=%d\n",
727 rp->req_num, rp->type, len);
728 }
729
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
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) +
812 sizeof(struct ds_var_set_msg) +
813 (p - base));
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
865 void ldom_power_off(void)
866 {
867 sun4v_mach_exit(0);
868 }
869
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 }
951 printk(KERN_INFO PFX "Could not register %s service\n",
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;
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;
1073 int err;
1074
1075 if (ds_version_printed++ == 0)
1076 printk(KERN_INFO "%s", version);
1077
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
1089 ds_cfg.tx_irq = vdev->tx_irq;
1090 ds_cfg.rx_irq = vdev->rx_irq;
1091
1092 lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp);
1093 if (IS_ERR(lp)) {
1094 err = PTR_ERR(lp);
1095 goto out_free_rcv_buf;
1096 }
1097 dp->lp = lp;
1098
1099 err = ldc_bind(lp, "DS");
1100 if (err)
1101 goto out_free_ldc;
1102
1103 ds_info = dp;
1104
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
1151 #ifdef CONFIG_HOTPLUG_CPU
1152 kthread_run(dr_cpu_thread, NULL, "kdrcpud");
1153 #endif
1154
1155 return vio_register_driver(&ds_driver);
1156 }
1157
1158 subsys_initcall(ds_init);
Linux kernel - Deliverables
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