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[SPARC64]: Clear cpu_{core,sibling}_map[] in smp_fill_in_sib_core_maps()
[deliverable/linux.git] / arch / sparc64 / kernel / ds.c
CommitLineData
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>
e450992d
DM		 23
24#define DRV_MODULE_NAME "ds"
25#define PFX DRV_MODULE_NAME ": "
26#define DRV_MODULE_VERSION "1.0"
27#define DRV_MODULE_RELDATE "Jul 11, 2007"
28
29static char version[] __devinitdata =
30 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
31MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
32MODULE_DESCRIPTION("Sun LDOM domain services driver");
33MODULE_LICENSE("GPL");
34MODULE_VERSION(DRV_MODULE_VERSION);
35
36struct ds_msg_tag {
37 __u32 type;
38#define DS_INIT_REQ 0x00
39#define DS_INIT_ACK 0x01
40#define DS_INIT_NACK 0x02
41#define DS_REG_REQ 0x03
42#define DS_REG_ACK 0x04
43#define DS_REG_NACK 0x05
44#define DS_UNREG_REQ 0x06
45#define DS_UNREG_ACK 0x07
46#define DS_UNREG_NACK 0x08
47#define DS_DATA 0x09
48#define DS_NACK 0x0a
49
50 __u32 len;
51};
52
53/* Result codes */
54#define DS_OK 0x00
55#define DS_REG_VER_NACK 0x01
56#define DS_REG_DUP 0x02
57#define DS_INV_HDL 0x03
58#define DS_TYPE_UNKNOWN 0x04
59
60struct ds_version {
61 __u16 major;
62 __u16 minor;
63};
64
65struct ds_ver_req {
66 struct ds_msg_tag tag;
67 struct ds_version ver;
68};
69
70struct ds_ver_ack {
71 struct ds_msg_tag tag;
72 __u16 minor;
73};
74
75struct ds_ver_nack {
76 struct ds_msg_tag tag;
77 __u16 major;
78};
79
80struct ds_reg_req {
81 struct ds_msg_tag tag;
82 __u64 handle;
83 __u16 major;
84 __u16 minor;
85 char svc_id[0];
86};
87
88struct ds_reg_ack {
89 struct ds_msg_tag tag;
90 __u64 handle;
91 __u16 minor;
92};
93
94struct ds_reg_nack {
95 struct ds_msg_tag tag;
96 __u64 handle;
97 __u16 major;
98};
99
100struct ds_unreg_req {
101 struct ds_msg_tag tag;
102 __u64 handle;
103};
104
105struct ds_unreg_ack {
106 struct ds_msg_tag tag;
107 __u64 handle;
108};
109
110struct ds_unreg_nack {
111 struct ds_msg_tag tag;
112 __u64 handle;
113};
114
115struct ds_data {
116 struct ds_msg_tag tag;
117 __u64 handle;
118};
119
120struct ds_data_nack {
121 struct ds_msg_tag tag;
122 __u64 handle;
123 __u64 result;
124};
125
126struct ds_cap_state {
127 __u64 handle;
128
129 void (*data)(struct ldc_channel *lp,
4f0234f4 130 struct ds_cap_state *cp,
e450992d
DM		 131 void *buf, int len);
132
133 const char *service_id;
134
135 u8 state;
136#define CAP_STATE_UNKNOWN 0x00
137#define CAP_STATE_REG_SENT 0x01
138#define CAP_STATE_REGISTERED 0x02
139};
140
4f0234f4
DM		 141static void md_update_data(struct ldc_channel *lp, struct ds_cap_state *cp,
142 void *buf, int len);
143static void domain_shutdown_data(struct ldc_channel *lp,
144 struct ds_cap_state *cp,
145 void *buf, int len);
146static void domain_panic_data(struct ldc_channel *lp,
147 struct ds_cap_state *cp,
148 void *buf, int len);
b14f5c10 149#ifdef CONFIG_HOTPLUG_CPU
4f0234f4
DM		 150static void dr_cpu_data(struct ldc_channel *lp,
151 struct ds_cap_state *cp,
152 void *buf, int len);
b14f5c10 153#endif
4f0234f4
DM		 154static void ds_pri_data(struct ldc_channel *lp,
155 struct ds_cap_state *cp,
156 void *buf, int len);
157static void ds_var_data(struct ldc_channel *lp,
158 struct ds_cap_state *cp,
159 void *buf, int len);
160
161struct ds_cap_state ds_states[] = {
162 {
163 .service_id = "md-update",
164 .data = md_update_data,
165 },
166 {
167 .service_id = "domain-shutdown",
168 .data = domain_shutdown_data,
169 },
170 {
171 .service_id = "domain-panic",
172 .data = domain_panic_data,
173 },
b14f5c10 174#ifdef CONFIG_HOTPLUG_CPU
4f0234f4
DM		 175 {
176 .service_id = "dr-cpu",
177 .data = dr_cpu_data,
178 },
b14f5c10 179#endif
4f0234f4
DM		 180 {
181 .service_id = "pri",
182 .data = ds_pri_data,
183 },
184 {
185 .service_id = "var-config",
186 .data = ds_var_data,
187 },
188 {
189 .service_id = "var-config-backup",
190 .data = ds_var_data,
191 },
192};
193
194static DEFINE_SPINLOCK(ds_lock);
195
196struct ds_info {
197 struct ldc_channel *lp;
198 u8 hs_state;
199#define DS_HS_START 0x01
200#define DS_HS_DONE 0x02
201
202 void *rcv_buf;
203 int rcv_buf_len;
204};
205
206static struct ds_info *ds_info;
207
208static struct ds_cap_state *find_cap(u64 handle)
209{
210 unsigned int index = handle >> 32;
211
212 if (index >= ARRAY_SIZE(ds_states))
213 return NULL;
214 return &ds_states[index];
215}
216
217static struct ds_cap_state *find_cap_by_string(const char *name)
218{
219 int i;
220
221 for (i = 0; i < ARRAY_SIZE(ds_states); i++) {
222 if (strcmp(ds_states[i].service_id, name))
223 continue;
224
225 return &ds_states[i];
226 }
227 return NULL;
228}
229
e450992d
DM		 230static int ds_send(struct ldc_channel *lp, void *data, int len)
231{
232 int err, limit = 1000;
233
234 err = -EINVAL;
235 while (limit-- > 0) {
236 err = ldc_write(lp, data, len);
237 if (!err || (err != -EAGAIN))
238 break;
239 udelay(1);
240 }
241
242 return err;
243}
244
245struct ds_md_update_req {
246 __u64 req_num;
247};
248
249struct ds_md_update_res {
250 __u64 req_num;
251 __u32 result;
252};
253
254static void md_update_data(struct ldc_channel *lp,
255 struct ds_cap_state *dp,
256 void *buf, int len)
257{
258 struct ds_data *dpkt = buf;
259 struct ds_md_update_req *rp;
260 struct {
261 struct ds_data data;
262 struct ds_md_update_res res;
263 } pkt;
264
265 rp = (struct ds_md_update_req *) (dpkt + 1);
266
b3e13fbe 267 printk(KERN_INFO PFX "Machine description update.\n");
e450992d
DM		 268
269 memset(&pkt, 0, sizeof(pkt));
270 pkt.data.tag.type = DS_DATA;
271 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
272 pkt.data.handle = dp->handle;
273 pkt.res.req_num = rp->req_num;
274 pkt.res.result = DS_OK;
275
276 ds_send(lp, &pkt, sizeof(pkt));
43fdf274
DM		 277
278 mdesc_update();
e450992d
DM		 279}
280
281struct ds_shutdown_req {
282 __u64 req_num;
283 __u32 ms_delay;
284};
285
286struct ds_shutdown_res {
287 __u64 req_num;
288 __u32 result;
289 char reason[1];
290};
291
292static void domain_shutdown_data(struct ldc_channel *lp,
293 struct ds_cap_state *dp,
294 void *buf, int len)
295{
296 struct ds_data *dpkt = buf;
297 struct ds_shutdown_req *rp;
298 struct {
299 struct ds_data data;
300 struct ds_shutdown_res res;
301 } pkt;
302
303 rp = (struct ds_shutdown_req *) (dpkt + 1);
304
305 printk(KERN_ALERT PFX "Shutdown request from "
306 "LDOM manager received.\n");
307
308 memset(&pkt, 0, sizeof(pkt));
309 pkt.data.tag.type = DS_DATA;
310 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
311 pkt.data.handle = dp->handle;
312 pkt.res.req_num = rp->req_num;
313 pkt.res.result = DS_OK;
314 pkt.res.reason[0] = 0;
315
316 ds_send(lp, &pkt, sizeof(pkt));
317
318 wake_up_powerd();
319}
320
321struct ds_panic_req {
322 __u64 req_num;
323};
324
325struct ds_panic_res {
326 __u64 req_num;
327 __u32 result;
328 char reason[1];
329};
330
331static void domain_panic_data(struct ldc_channel *lp,
332 struct ds_cap_state *dp,
333 void *buf, int len)
334{
335 struct ds_data *dpkt = buf;
336 struct ds_panic_req *rp;
337 struct {
338 struct ds_data data;
339 struct ds_panic_res res;
340 } pkt;
341
342 rp = (struct ds_panic_req *) (dpkt + 1);
343
b3e13fbe
DM		 344 printk(KERN_ALERT PFX "Panic request from "
345 "LDOM manager received.\n");
e450992d
DM		 346
347 memset(&pkt, 0, sizeof(pkt));
348 pkt.data.tag.type = DS_DATA;
349 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
350 pkt.data.handle = dp->handle;
351 pkt.res.req_num = rp->req_num;
352 pkt.res.result = DS_OK;
353 pkt.res.reason[0] = 0;
354
355 ds_send(lp, &pkt, sizeof(pkt));
356
357 panic("PANIC requested by LDOM manager.");
358}
359
b14f5c10 360#ifdef CONFIG_HOTPLUG_CPU
4f0234f4 361struct dr_cpu_tag {
e450992d
DM		 362 __u64 req_num;
363 __u32 type;
4f0234f4
DM		 364#define DR_CPU_CONFIGURE 0x43
365#define DR_CPU_UNCONFIGURE 0x55
366#define DR_CPU_FORCE_UNCONFIGURE 0x46
367#define DR_CPU_STATUS 0x53
e450992d
DM		 368
369/* Responses */
4f0234f4
DM		 370#define DR_CPU_OK 0x6f
371#define DR_CPU_ERROR 0x65
e450992d
DM		 372
373 __u32 num_records;
374};
375
4f0234f4
DM		 376struct dr_cpu_resp_entry {
377 __u32 cpu;
378 __u32 result;
379#define DR_CPU_RES_OK 0x00
380#define DR_CPU_RES_FAILURE 0x01
381#define DR_CPU_RES_BLOCKED 0x02
382#define DR_CPU_RES_CPU_NOT_RESPONDING 0x03
383#define DR_CPU_RES_NOT_IN_MD 0x04
384
385 __u32 stat;
386#define DR_CPU_STAT_NOT_PRESENT 0x00
387#define DR_CPU_STAT_UNCONFIGURED 0x01
388#define DR_CPU_STAT_CONFIGURED 0x02
389
390 __u32 str_off;
e450992d
DM		 391};
392
4f0234f4
DM		 393/* DR cpu requests get queued onto the work list by the
394 * dr_cpu_data() callback. The list is protected by
395 * ds_lock, and processed by dr_cpu_process() in order.
396 */
397static LIST_HEAD(dr_cpu_work_list);
bd0e11ff 398static DECLARE_WAIT_QUEUE_HEAD(dr_cpu_wait);
4f0234f4
DM		 399
400struct dr_cpu_queue_entry {
401 struct list_head list;
402 char req[0];
403};
404
405static void __dr_cpu_send_error(struct ds_cap_state *cp, struct ds_data *data)
406{
407 struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
408 struct ds_info *dp = ds_info;
409 struct {
410 struct ds_data data;
411 struct dr_cpu_tag tag;
412 } pkt;
413 int msg_len;
414
415 memset(&pkt, 0, sizeof(pkt));
416 pkt.data.tag.type = DS_DATA;
417 pkt.data.handle = cp->handle;
418 pkt.tag.req_num = tag->req_num;
419 pkt.tag.type = DR_CPU_ERROR;
420 pkt.tag.num_records = 0;
421
422 msg_len = (sizeof(struct ds_data) +
423 sizeof(struct dr_cpu_tag));
424
425 pkt.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
426
427 ds_send(dp->lp, &pkt, msg_len);
428}
429
430static void dr_cpu_send_error(struct ds_cap_state *cp, struct ds_data *data)
431{
432 unsigned long flags;
433
434 spin_lock_irqsave(&ds_lock, flags);
435 __dr_cpu_send_error(cp, data);
436 spin_unlock_irqrestore(&ds_lock, flags);
437}
438
439#define CPU_SENTINEL 0xffffffff
440
441static void purge_dups(u32 *list, u32 num_ents)
442{
443 unsigned int i;
444
445 for (i = 0; i < num_ents; i++) {
446 u32 cpu = list[i];
447 unsigned int j;
448
449 if (cpu == CPU_SENTINEL)
450 continue;
451
452 for (j = i + 1; j < num_ents; j++) {
453 if (list[j] == cpu)
454 list[j] = CPU_SENTINEL;
455 }
456 }
457}
458
459static int dr_cpu_size_response(int ncpus)
460{
461 return (sizeof(struct ds_data) +
462 sizeof(struct dr_cpu_tag) +
463 (sizeof(struct dr_cpu_resp_entry) * ncpus));
464}
465
466static void dr_cpu_init_response(struct ds_data *resp, u64 req_num,
467 u64 handle, int resp_len, int ncpus,
468 cpumask_t *mask, u32 default_stat)
469{
470 struct dr_cpu_resp_entry *ent;
471 struct dr_cpu_tag *tag;
472 int i, cpu;
473
474 tag = (struct dr_cpu_tag *) (resp + 1);
475 ent = (struct dr_cpu_resp_entry *) (tag + 1);
476
477 resp->tag.type = DS_DATA;
478 resp->tag.len = resp_len - sizeof(struct ds_msg_tag);
479 resp->handle = handle;
480 tag->req_num = req_num;
481 tag->type = DR_CPU_OK;
482 tag->num_records = ncpus;
483
484 i = 0;
485 for_each_cpu_mask(cpu, *mask) {
486 ent[i].cpu = cpu;
487 ent[i].result = DR_CPU_RES_OK;
488 ent[i].stat = default_stat;
489 i++;
490 }
491 BUG_ON(i != ncpus);
492}
493
494static void dr_cpu_mark(struct ds_data *resp, int cpu, int ncpus,
495 u32 res, u32 stat)
496{
497 struct dr_cpu_resp_entry *ent;
498 struct dr_cpu_tag *tag;
499 int i;
500
501 tag = (struct dr_cpu_tag *) (resp + 1);
502 ent = (struct dr_cpu_resp_entry *) (tag + 1);
503
504 for (i = 0; i < ncpus; i++) {
505 if (ent[i].cpu != cpu)
506 continue;
507 ent[i].result = res;
508 ent[i].stat = stat;
509 break;
510 }
511}
512
513static int dr_cpu_configure(struct ds_cap_state *cp, u64 req_num,
514 cpumask_t *mask)
515{
516 struct ds_data *resp;
517 int resp_len, ncpus, cpu;
518 unsigned long flags;
519
520 ncpus = cpus_weight(*mask);
521 resp_len = dr_cpu_size_response(ncpus);
522 resp = kzalloc(resp_len, GFP_KERNEL);
523 if (!resp)
524 return -ENOMEM;
525
526 dr_cpu_init_response(resp, req_num, cp->handle,
527 resp_len, ncpus, mask,
528 DR_CPU_STAT_CONFIGURED);
529
530 mdesc_fill_in_cpu_data(*mask);
531
532 for_each_cpu_mask(cpu, *mask) {
533 int err;
534
535 printk(KERN_INFO PFX "Starting cpu %d...\n", cpu);
536 err = cpu_up(cpu);
bd0e11ff
DM		 537 if (err) {
538 printk(KERN_INFO PFX "CPU startup failed err=%d\n",
539 err);
4f0234f4
DM		 540 dr_cpu_mark(resp, cpu, ncpus,
541 DR_CPU_RES_FAILURE,
542 DR_CPU_STAT_UNCONFIGURED);
bd0e11ff 543 }
4f0234f4
DM		 544 }
545
546 spin_lock_irqsave(&ds_lock, flags);
547 ds_send(ds_info->lp, resp, resp_len);
548 spin_unlock_irqrestore(&ds_lock, flags);
549
550 kfree(resp);
551
552 return 0;
553}
554
555static int dr_cpu_unconfigure(struct ds_cap_state *cp, u64 req_num,
556 cpumask_t *mask)
557{
558 struct ds_data *resp;
559 int resp_len, ncpus;
560
561 ncpus = cpus_weight(*mask);
562 resp_len = dr_cpu_size_response(ncpus);
563 resp = kzalloc(resp_len, GFP_KERNEL);
564 if (!resp)
565 return -ENOMEM;
566
567 dr_cpu_init_response(resp, req_num, cp->handle,
568 resp_len, ncpus, mask,
569 DR_CPU_STAT_UNCONFIGURED);
570
571 kfree(resp);
572
573 return -EOPNOTSUPP;
574}
575
bd0e11ff 576static void process_dr_cpu_list(struct ds_cap_state *cp)
4f0234f4
DM		 577{
578 struct dr_cpu_queue_entry *qp, *tmp;
4f0234f4
DM		 579 unsigned long flags;
580 LIST_HEAD(todo);
581 cpumask_t mask;
582
4f0234f4
DM		 583 spin_lock_irqsave(&ds_lock, flags);
584 list_splice(&dr_cpu_work_list, &todo);
bd0e11ff 585 INIT_LIST_HEAD(&dr_cpu_work_list);
4f0234f4
DM		 586 spin_unlock_irqrestore(&ds_lock, flags);
587
588 list_for_each_entry_safe(qp, tmp, &todo, list) {
589 struct ds_data *data = (struct ds_data *) qp->req;
590 struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
591 u32 *cpu_list = (u32 *) (tag + 1);
592 u64 req_num = tag->req_num;
593 unsigned int i;
594 int err;
595
596 switch (tag->type) {
597 case DR_CPU_CONFIGURE:
598 case DR_CPU_UNCONFIGURE:
599 case DR_CPU_FORCE_UNCONFIGURE:
600 break;
601
602 default:
603 dr_cpu_send_error(cp, data);
604 goto next;
605 }
606
607 purge_dups(cpu_list, tag->num_records);
608
609 cpus_clear(mask);
610 for (i = 0; i < tag->num_records; i++) {
611 if (cpu_list[i] == CPU_SENTINEL)
612 continue;
613
614 if (cpu_list[i] < NR_CPUS)
615 cpu_set(cpu_list[i], mask);
616 }
617
618 if (tag->type == DR_CPU_CONFIGURE)
619 err = dr_cpu_configure(cp, req_num, &mask);
620 else
621 err = dr_cpu_unconfigure(cp, req_num, &mask);
622
623 if (err)
624 dr_cpu_send_error(cp, data);
625
626next:
627 list_del(&qp->list);
628 kfree(qp);
629 }
630}
631
bd0e11ff
DM		 632static int dr_cpu_thread(void *__unused)
633{
634 struct ds_cap_state *cp;
635 DEFINE_WAIT(wait);
636
637 cp = find_cap_by_string("dr-cpu");
638
639 while (1) {
640 prepare_to_wait(&dr_cpu_wait, &wait, TASK_INTERRUPTIBLE);
641 if (list_empty(&dr_cpu_work_list))
642 schedule();
643 finish_wait(&dr_cpu_wait, &wait);
644
645 if (kthread_should_stop())
646 break;
647
648 process_dr_cpu_list(cp);
649 }
650
651 return 0;
652}
4f0234f4 653
e450992d
DM		 654static void dr_cpu_data(struct ldc_channel *lp,
655 struct ds_cap_state *dp,
656 void *buf, int len)
657{
4f0234f4 658 struct dr_cpu_queue_entry *qp;
e450992d 659 struct ds_data *dpkt = buf;
4f0234f4 660 struct dr_cpu_tag *rp;
e450992d 661
4f0234f4 662 rp = (struct dr_cpu_tag *) (dpkt + 1);
e450992d 663
4f0234f4
DM		 664 qp = kmalloc(sizeof(struct dr_cpu_queue_entry) + len, GFP_ATOMIC);
665 if (!qp) {
666 struct ds_cap_state *cp;
667
668 cp = find_cap_by_string("dr-cpu");
669 __dr_cpu_send_error(cp, dpkt);
670 } else {
671 memcpy(&qp->req, buf, len);
672 list_add_tail(&qp->list, &dr_cpu_work_list);
bd0e11ff 673 wake_up(&dr_cpu_wait);
4f0234f4 674 }
e450992d 675}
b14f5c10 676#endif
e450992d
DM		 677
678struct ds_pri_msg {
679 __u64 req_num;
680 __u64 type;
681#define DS_PRI_REQUEST 0x00
682#define DS_PRI_DATA 0x01
683#define DS_PRI_UPDATE 0x02
684};
685
686static void ds_pri_data(struct ldc_channel *lp,
687 struct ds_cap_state *dp,
688 void *buf, int len)
689{
690 struct ds_data *dpkt = buf;
691 struct ds_pri_msg *rp;
692
693 rp = (struct ds_pri_msg *) (dpkt + 1);
694
b3e13fbe 695 printk(KERN_INFO PFX "PRI REQ [%lx:%lx], len=%d\n",
e450992d
DM		 696 rp->req_num, rp->type, len);
697}
698
b3e13fbe
DM		 699struct ds_var_hdr {
700 __u32 type;
701#define DS_VAR_SET_REQ 0x00
702#define DS_VAR_DELETE_REQ 0x01
703#define DS_VAR_SET_RESP 0x02
704#define DS_VAR_DELETE_RESP 0x03
705};
706
707struct ds_var_set_msg {
708 struct ds_var_hdr hdr;
709 char name_and_value[0];
710};
711
712struct ds_var_delete_msg {
713 struct ds_var_hdr hdr;
714 char name[0];
715};
716
717struct ds_var_resp {
718 struct ds_var_hdr hdr;
719 __u32 result;
720#define DS_VAR_SUCCESS 0x00
721#define DS_VAR_NO_SPACE 0x01
722#define DS_VAR_INVALID_VAR 0x02
723#define DS_VAR_INVALID_VAL 0x03
724#define DS_VAR_NOT_PRESENT 0x04
725};
726
727static DEFINE_MUTEX(ds_var_mutex);
728static int ds_var_doorbell;
729static int ds_var_response;
730
731static void ds_var_data(struct ldc_channel *lp,
732 struct ds_cap_state *dp,
733 void *buf, int len)
734{
735 struct ds_data *dpkt = buf;
736 struct ds_var_resp *rp;
737
738 rp = (struct ds_var_resp *) (dpkt + 1);
739
740 if (rp->hdr.type != DS_VAR_SET_RESP &&
741 rp->hdr.type != DS_VAR_DELETE_RESP)
742 return;
743
744 ds_var_response = rp->result;
745 wmb();
746 ds_var_doorbell = 1;
747}
748
b3e13fbe
DM		 749void ldom_set_var(const char *var, const char *value)
750{
751 struct ds_info *dp = ds_info;
752 struct ds_cap_state *cp;
753
754 cp = find_cap_by_string("var-config");
755 if (cp->state != CAP_STATE_REGISTERED)
756 cp = find_cap_by_string("var-config-backup");
757
758 if (cp->state == CAP_STATE_REGISTERED) {
759 union {
760 struct {
761 struct ds_data data;
762 struct ds_var_set_msg msg;
763 } header;
764 char all[512];
765 } pkt;
766 unsigned long flags;
767 char *base, *p;
768 int msg_len, loops;
769
770 memset(&pkt, 0, sizeof(pkt));
771 pkt.header.data.tag.type = DS_DATA;
772 pkt.header.data.handle = cp->handle;
773 pkt.header.msg.hdr.type = DS_VAR_SET_REQ;
774 base = p = &pkt.header.msg.name_and_value[0];
775 strcpy(p, var);
776 p += strlen(var) + 1;
777 strcpy(p, value);
778 p += strlen(value) + 1;
779
780 msg_len = (sizeof(struct ds_data) +
4f0234f4
DM		 781 sizeof(struct ds_var_set_msg) +
782 (p - base));
b3e13fbe
DM		 783 msg_len = (msg_len + 3) & ~3;
784 pkt.header.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
785
786 mutex_lock(&ds_var_mutex);
787
788 spin_lock_irqsave(&ds_lock, flags);
789 ds_var_doorbell = 0;
790 ds_var_response = -1;
791
792 ds_send(dp->lp, &pkt, msg_len);
793 spin_unlock_irqrestore(&ds_lock, flags);
794
795 loops = 1000;
796 while (ds_var_doorbell == 0) {
797 if (loops-- < 0)
798 break;
799 barrier();
800 udelay(100);
801 }
802
803 mutex_unlock(&ds_var_mutex);
804
805 if (ds_var_doorbell == 0 ||
806 ds_var_response != DS_VAR_SUCCESS)
807 printk(KERN_ERR PFX "var-config [%s:%s] "
808 "failed, response(%d).\n",
809 var, value,
810 ds_var_response);
811 } else {
812 printk(KERN_ERR PFX "var-config not registered so "
813 "could not set (%s) variable to (%s).\n",
814 var, value);
815 }
816}
817
818void ldom_reboot(const char *boot_command)
819{
820 /* Don't bother with any of this if the boot_command
821 * is empty.
822 */
823 if (boot_command && strlen(boot_command)) {
824 char full_boot_str[256];
825
826 strcpy(full_boot_str, "boot ");
827 strcpy(full_boot_str + strlen("boot "), boot_command);
828
829 ldom_set_var("reboot-command", full_boot_str);
830 }
831 sun4v_mach_sir();
832}
833
4f0234f4
DM		 834void ldom_power_off(void)
835{
836 sun4v_mach_exit(0);
837}
838
e450992d
DM		 839static void ds_conn_reset(struct ds_info *dp)
840{
841 printk(KERN_ERR PFX "ds_conn_reset() from %p\n",
842 __builtin_return_address(0));
843}
844
845static int register_services(struct ds_info *dp)
846{
847 struct ldc_channel *lp = dp->lp;
848 int i;
849
850 for (i = 0; i < ARRAY_SIZE(ds_states); i++) {
851 struct {
852 struct ds_reg_req req;
853 u8 id_buf[256];
854 } pbuf;
855 struct ds_cap_state *cp = &ds_states[i];
856 int err, msg_len;
857 u64 new_count;
858
859 if (cp->state == CAP_STATE_REGISTERED)
860 continue;
861
862 new_count = sched_clock() & 0xffffffff;
863 cp->handle = ((u64) i << 32) | new_count;
864
865 msg_len = (sizeof(struct ds_reg_req) +
866 strlen(cp->service_id));
867
868 memset(&pbuf, 0, sizeof(pbuf));
869 pbuf.req.tag.type = DS_REG_REQ;
870 pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag));
871 pbuf.req.handle = cp->handle;
872 pbuf.req.major = 1;
873 pbuf.req.minor = 0;
874 strcpy(pbuf.req.svc_id, cp->service_id);
875
876 err = ds_send(lp, &pbuf, msg_len);
877 if (err > 0)
878 cp->state = CAP_STATE_REG_SENT;
879 }
880 return 0;
881}
882
883static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt)
884{
885
886 if (dp->hs_state == DS_HS_START) {
887 if (pkt->type != DS_INIT_ACK)
888 goto conn_reset;
889
890 dp->hs_state = DS_HS_DONE;
891
892 return register_services(dp);
893 }
894
895 if (dp->hs_state != DS_HS_DONE)
896 goto conn_reset;
897
898 if (pkt->type == DS_REG_ACK) {
899 struct ds_reg_ack *ap = (struct ds_reg_ack *) pkt;
900 struct ds_cap_state *cp = find_cap(ap->handle);
901
902 if (!cp) {
903 printk(KERN_ERR PFX "REG ACK for unknown handle %lx\n",
904 ap->handle);
905 return 0;
906 }
907 printk(KERN_INFO PFX "Registered %s service.\n",
908 cp->service_id);
909 cp->state = CAP_STATE_REGISTERED;
910 } else if (pkt->type == DS_REG_NACK) {
911 struct ds_reg_nack *np = (struct ds_reg_nack *) pkt;
912 struct ds_cap_state *cp = find_cap(np->handle);
913
914 if (!cp) {
915 printk(KERN_ERR PFX "REG NACK for "
916 "unknown handle %lx\n",
917 np->handle);
918 return 0;
919 }
4f0234f4 920 printk(KERN_INFO PFX "Could not register %s service\n",
e450992d
DM		 921 cp->service_id);
922 cp->state = CAP_STATE_UNKNOWN;
923 }
924
925 return 0;
926
927conn_reset:
928 ds_conn_reset(dp);
929 return -ECONNRESET;
930}
931
932static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len)
933{
934 struct ds_data *dpkt = (struct ds_data *) pkt;
935 struct ds_cap_state *cp = find_cap(dpkt->handle);
936
937 if (!cp) {
938 struct ds_data_nack nack = {
939 .tag = {
940 .type = DS_NACK,
941 .len = (sizeof(struct ds_data_nack) -
942 sizeof(struct ds_msg_tag)),
943 },
944 .handle = dpkt->handle,
945 .result = DS_INV_HDL,
946 };
947
948 printk(KERN_ERR PFX "Data for unknown handle %lu\n",
949 dpkt->handle);
950 ds_send(dp->lp, &nack, sizeof(nack));
951 } else {
952 cp->data(dp->lp, cp, dpkt, len);
953 }
954 return 0;
955}
956
957static void ds_up(struct ds_info *dp)
958{
959 struct ldc_channel *lp = dp->lp;
960 struct ds_ver_req req;
961 int err;
962
963 req.tag.type = DS_INIT_REQ;
964 req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag);
965 req.ver.major = 1;
966 req.ver.minor = 0;
967
968 err = ds_send(lp, &req, sizeof(req));
969 if (err > 0)
970 dp->hs_state = DS_HS_START;
971}
972
973static void ds_event(void *arg, int event)
974{
975 struct ds_info *dp = arg;
976 struct ldc_channel *lp = dp->lp;
977 unsigned long flags;
978 int err;
979
980 spin_lock_irqsave(&ds_lock, flags);
981
982 if (event == LDC_EVENT_UP) {
983 ds_up(dp);
984 spin_unlock_irqrestore(&ds_lock, flags);
985 return;
986 }
987
988 if (event != LDC_EVENT_DATA_READY) {
989 printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event);
990 spin_unlock_irqrestore(&ds_lock, flags);
991 return;
992 }
993
994 err = 0;
995 while (1) {
996 struct ds_msg_tag *tag;
997
998 err = ldc_read(lp, dp->rcv_buf, sizeof(*tag));
999
1000 if (unlikely(err < 0)) {
1001 if (err == -ECONNRESET)
1002 ds_conn_reset(dp);
1003 break;
1004 }
1005 if (err == 0)
1006 break;
1007
1008 tag = dp->rcv_buf;
1009 err = ldc_read(lp, tag + 1, tag->len);
1010
1011 if (unlikely(err < 0)) {
1012 if (err == -ECONNRESET)
1013 ds_conn_reset(dp);
1014 break;
1015 }
1016 if (err < tag->len)
1017 break;
1018
1019 if (tag->type < DS_DATA)
1020 err = ds_handshake(dp, dp->rcv_buf);
1021 else
1022 err = ds_data(dp, dp->rcv_buf,
1023 sizeof(*tag) + err);
1024 if (err == -ECONNRESET)
1025 break;
1026 }
1027
1028 spin_unlock_irqrestore(&ds_lock, flags);
1029}
1030
1031static int __devinit ds_probe(struct vio_dev *vdev,
1032 const struct vio_device_id *id)
1033{
1034 static int ds_version_printed;
e450992d
DM		 1035 struct ldc_channel_config ds_cfg = {
1036 .event = ds_event,
1037 .mtu = 4096,
1038 .mode = LDC_MODE_STREAM,
1039 };
1040 struct ldc_channel *lp;
1041 struct ds_info *dp;
e450992d
DM		 1042 int err;
1043
1044 if (ds_version_printed++ == 0)
1045 printk(KERN_INFO "%s", version);
1046
e450992d
DM		 1047 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1048 err = -ENOMEM;
1049 if (!dp)
1050 goto out_err;
1051
1052 dp->rcv_buf = kzalloc(4096, GFP_KERNEL);
1053 if (!dp->rcv_buf)
1054 goto out_free_dp;
1055
1056 dp->rcv_buf_len = 4096;
1057
43fdf274
DM		 1058 ds_cfg.tx_irq = vdev->tx_irq;
1059 ds_cfg.rx_irq = vdev->rx_irq;
e450992d 1060
43fdf274 1061 lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp);
e450992d
DM		 1062 if (IS_ERR(lp)) {
1063 err = PTR_ERR(lp);
1064 goto out_free_rcv_buf;
1065 }
1066 dp->lp = lp;
1067
133f09a1 1068 err = ldc_bind(lp, "DS");
e450992d
DM		 1069 if (err)
1070 goto out_free_ldc;
1071
b3e13fbe
DM		 1072 ds_info = dp;
1073
e450992d
DM		 1074 start_powerd();
1075
1076 return err;
1077
1078out_free_ldc:
1079 ldc_free(dp->lp);
1080
1081out_free_rcv_buf:
1082 kfree(dp->rcv_buf);
1083
1084out_free_dp:
1085 kfree(dp);
1086
1087out_err:
1088 return err;
1089}
1090
1091static int ds_remove(struct vio_dev *vdev)
1092{
1093 return 0;
1094}
1095
1096static struct vio_device_id ds_match[] = {
1097 {
1098 .type = "domain-services-port",
1099 },
1100 {},
1101};
1102
1103static struct vio_driver ds_driver = {
1104 .id_table = ds_match,
1105 .probe = ds_probe,
1106 .remove = ds_remove,
1107 .driver = {
1108 .name = "ds",
1109 .owner = THIS_MODULE,
1110 }
1111};
1112
1113static int __init ds_init(void)
1114{
1115 int i;
1116
1117 for (i = 0; i < ARRAY_SIZE(ds_states); i++)
1118 ds_states[i].handle = ((u64)i << 32);
1119
bd0e11ff
DM		 1120#ifdef CONFIG_HOTPLUG_CPU
1121 kthread_run(dr_cpu_thread, NULL, "kdrcpud");
1122#endif
1123
e450992d
DM		 1124 return vio_register_driver(&ds_driver);
1125}
1126
1127subsys_initcall(ds_init);
Linux kernel - Deliverables
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