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staging:iio:dac:ad5791: Allow asymmetrical reference voltages
[zen-stable.git] / arch / sparc / kernel / ds.c
blob7429b47c3acad8adb97ff177c4459fafcb1ae1e3
1 /* ds.c: Domain Services driver for Logical Domains
2 *
3 * Copyright (C) 2007, 2008 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/string.h>
10 #include <linux/slab.h>
11 #include <linux/sched.h>
12 #include <linux/delay.h>
13 #include <linux/mutex.h>
14 #include <linux/kthread.h>
15 #include <linux/reboot.h>
16 #include <linux/cpu.h>
17
18 #include <asm/hypervisor.h>
19 #include <asm/ldc.h>
20 #include <asm/vio.h>
21 #include <asm/mdesc.h>
22 #include <asm/head.h>
23 #include <asm/irq.h>
24
25 #include "kernel.h"
26
27 #define DRV_MODULE_NAME "ds"
28 #define PFX DRV_MODULE_NAME ": "
29 #define DRV_MODULE_VERSION "1.0"
30 #define DRV_MODULE_RELDATE "Jul 11, 2007"
31
32 static char version[] __devinitdata =
33 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
34 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
35 MODULE_DESCRIPTION("Sun LDOM domain services driver");
36 MODULE_LICENSE("GPL");
37 MODULE_VERSION(DRV_MODULE_VERSION);
38
39 struct ds_msg_tag {
40 __u32 type;
41 #define DS_INIT_REQ 0x00
42 #define DS_INIT_ACK 0x01
43 #define DS_INIT_NACK 0x02
44 #define DS_REG_REQ 0x03
45 #define DS_REG_ACK 0x04
46 #define DS_REG_NACK 0x05
47 #define DS_UNREG_REQ 0x06
48 #define DS_UNREG_ACK 0x07
49 #define DS_UNREG_NACK 0x08
50 #define DS_DATA 0x09
51 #define DS_NACK 0x0a
52
53 __u32 len;
54 };
55
56 /* Result codes */
57 #define DS_OK 0x00
58 #define DS_REG_VER_NACK 0x01
59 #define DS_REG_DUP 0x02
60 #define DS_INV_HDL 0x03
61 #define DS_TYPE_UNKNOWN 0x04
62
63 struct ds_version {
64 __u16 major;
65 __u16 minor;
66 };
67
68 struct ds_ver_req {
69 struct ds_msg_tag tag;
70 struct ds_version ver;
71 };
72
73 struct ds_ver_ack {
74 struct ds_msg_tag tag;
75 __u16 minor;
76 };
77
78 struct ds_ver_nack {
79 struct ds_msg_tag tag;
80 __u16 major;
81 };
82
83 struct ds_reg_req {
84 struct ds_msg_tag tag;
85 __u64 handle;
86 __u16 major;
87 __u16 minor;
88 char svc_id[0];
89 };
90
91 struct ds_reg_ack {
92 struct ds_msg_tag tag;
93 __u64 handle;
94 __u16 minor;
95 };
96
97 struct ds_reg_nack {
98 struct ds_msg_tag tag;
99 __u64 handle;
100 __u16 major;
101 };
102
103 struct ds_unreg_req {
104 struct ds_msg_tag tag;
105 __u64 handle;
106 };
107
108 struct ds_unreg_ack {
109 struct ds_msg_tag tag;
110 __u64 handle;
111 };
112
113 struct ds_unreg_nack {
114 struct ds_msg_tag tag;
115 __u64 handle;
116 };
117
118 struct ds_data {
119 struct ds_msg_tag tag;
120 __u64 handle;
121 };
122
123 struct ds_data_nack {
124 struct ds_msg_tag tag;
125 __u64 handle;
126 __u64 result;
127 };
128
129 struct ds_info;
130 struct ds_cap_state {
131 __u64 handle;
132
133 void (*data)(struct ds_info *dp,
134 struct ds_cap_state *cp,
135 void *buf, int len);
136
137 const char *service_id;
138
139 u8 state;
140 #define CAP_STATE_UNKNOWN 0x00
141 #define CAP_STATE_REG_SENT 0x01
142 #define CAP_STATE_REGISTERED 0x02
143 };
144
145 static void md_update_data(struct ds_info *dp, struct ds_cap_state *cp,
146 void *buf, int len);
147 static void domain_shutdown_data(struct ds_info *dp,
148 struct ds_cap_state *cp,
149 void *buf, int len);
150 static void domain_panic_data(struct ds_info *dp,
151 struct ds_cap_state *cp,
152 void *buf, int len);
153 #ifdef CONFIG_HOTPLUG_CPU
154 static void dr_cpu_data(struct ds_info *dp,
155 struct ds_cap_state *cp,
156 void *buf, int len);
157 #endif
158 static void ds_pri_data(struct ds_info *dp,
159 struct ds_cap_state *cp,
160 void *buf, int len);
161 static void ds_var_data(struct ds_info *dp,
162 struct ds_cap_state *cp,
163 void *buf, int len);
164
165 static struct ds_cap_state ds_states_template[] = {
166 {
167 .service_id = "md-update",
168 .data = md_update_data,
169 },
170 {
171 .service_id = "domain-shutdown",
172 .data = domain_shutdown_data,
173 },
174 {
175 .service_id = "domain-panic",
176 .data = domain_panic_data,
177 },
178 #ifdef CONFIG_HOTPLUG_CPU
179 {
180 .service_id = "dr-cpu",
181 .data = dr_cpu_data,
182 },
183 #endif
184 {
185 .service_id = "pri",
186 .data = ds_pri_data,
187 },
188 {
189 .service_id = "var-config",
190 .data = ds_var_data,
191 },
192 {
193 .service_id = "var-config-backup",
194 .data = ds_var_data,
195 },
196 };
197
198 static DEFINE_SPINLOCK(ds_lock);
199
200 struct ds_info {
201 struct ldc_channel *lp;
202 u8 hs_state;
203 #define DS_HS_START 0x01
204 #define DS_HS_DONE 0x02
205
206 u64 id;
207
208 void *rcv_buf;
209 int rcv_buf_len;
210
211 struct ds_cap_state *ds_states;
212 int num_ds_states;
213
214 struct ds_info *next;
215 };
216
217 static struct ds_info *ds_info_list;
218
219 static struct ds_cap_state *find_cap(struct ds_info *dp, u64 handle)
220 {
221 unsigned int index = handle >> 32;
222
223 if (index >= dp->num_ds_states)
224 return NULL;
225 return &dp->ds_states[index];
226 }
227
228 static struct ds_cap_state *find_cap_by_string(struct ds_info *dp,
229 const char *name)
230 {
231 int i;
232
233 for (i = 0; i < dp->num_ds_states; i++) {
234 if (strcmp(dp->ds_states[i].service_id, name))
235 continue;
236
237 return &dp->ds_states[i];
238 }
239 return NULL;
240 }
241
242 static int __ds_send(struct ldc_channel *lp, void *data, int len)
243 {
244 int err, limit = 1000;
245
246 err = -EINVAL;
247 while (limit-- > 0) {
248 err = ldc_write(lp, data, len);
249 if (!err || (err != -EAGAIN))
250 break;
251 udelay(1);
252 }
253
254 return err;
255 }
256
257 static int ds_send(struct ldc_channel *lp, void *data, int len)
258 {
259 unsigned long flags;
260 int err;
261
262 spin_lock_irqsave(&ds_lock, flags);
263 err = __ds_send(lp, data, len);
264 spin_unlock_irqrestore(&ds_lock, flags);
265
266 return err;
267 }
268
269 struct ds_md_update_req {
270 __u64 req_num;
271 };
272
273 struct ds_md_update_res {
274 __u64 req_num;
275 __u32 result;
276 };
277
278 static void md_update_data(struct ds_info *dp,
279 struct ds_cap_state *cp,
280 void *buf, int len)
281 {
282 struct ldc_channel *lp = dp->lp;
283 struct ds_data *dpkt = buf;
284 struct ds_md_update_req *rp;
285 struct {
286 struct ds_data data;
287 struct ds_md_update_res res;
288 } pkt;
289
290 rp = (struct ds_md_update_req *) (dpkt + 1);
291
292 printk(KERN_INFO "ds-%llu: Machine description update.\n", dp->id);
293
294 mdesc_update();
295
296 memset(&pkt, 0, sizeof(pkt));
297 pkt.data.tag.type = DS_DATA;
298 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
299 pkt.data.handle = cp->handle;
300 pkt.res.req_num = rp->req_num;
301 pkt.res.result = DS_OK;
302
303 ds_send(lp, &pkt, sizeof(pkt));
304 }
305
306 struct ds_shutdown_req {
307 __u64 req_num;
308 __u32 ms_delay;
309 };
310
311 struct ds_shutdown_res {
312 __u64 req_num;
313 __u32 result;
314 char reason[1];
315 };
316
317 static void domain_shutdown_data(struct ds_info *dp,
318 struct ds_cap_state *cp,
319 void *buf, int len)
320 {
321 struct ldc_channel *lp = dp->lp;
322 struct ds_data *dpkt = buf;
323 struct ds_shutdown_req *rp;
324 struct {
325 struct ds_data data;
326 struct ds_shutdown_res res;
327 } pkt;
328
329 rp = (struct ds_shutdown_req *) (dpkt + 1);
330
331 printk(KERN_ALERT "ds-%llu: Shutdown request from "
332 "LDOM manager received.\n", dp->id);
333
334 memset(&pkt, 0, sizeof(pkt));
335 pkt.data.tag.type = DS_DATA;
336 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
337 pkt.data.handle = cp->handle;
338 pkt.res.req_num = rp->req_num;
339 pkt.res.result = DS_OK;
340 pkt.res.reason[0] = 0;
341
342 ds_send(lp, &pkt, sizeof(pkt));
343
344 orderly_poweroff(true);
345 }
346
347 struct ds_panic_req {
348 __u64 req_num;
349 };
350
351 struct ds_panic_res {
352 __u64 req_num;
353 __u32 result;
354 char reason[1];
355 };
356
357 static void domain_panic_data(struct ds_info *dp,
358 struct ds_cap_state *cp,
359 void *buf, int len)
360 {
361 struct ldc_channel *lp = dp->lp;
362 struct ds_data *dpkt = buf;
363 struct ds_panic_req *rp;
364 struct {
365 struct ds_data data;
366 struct ds_panic_res res;
367 } pkt;
368
369 rp = (struct ds_panic_req *) (dpkt + 1);
370
371 printk(KERN_ALERT "ds-%llu: Panic request from "
372 "LDOM manager received.\n", dp->id);
373
374 memset(&pkt, 0, sizeof(pkt));
375 pkt.data.tag.type = DS_DATA;
376 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
377 pkt.data.handle = cp->handle;
378 pkt.res.req_num = rp->req_num;
379 pkt.res.result = DS_OK;
380 pkt.res.reason[0] = 0;
381
382 ds_send(lp, &pkt, sizeof(pkt));
383
384 panic("PANIC requested by LDOM manager.");
385 }
386
387 #ifdef CONFIG_HOTPLUG_CPU
388 struct dr_cpu_tag {
389 __u64 req_num;
390 __u32 type;
391 #define DR_CPU_CONFIGURE 0x43
392 #define DR_CPU_UNCONFIGURE 0x55
393 #define DR_CPU_FORCE_UNCONFIGURE 0x46
394 #define DR_CPU_STATUS 0x53
395
396 /* Responses */
397 #define DR_CPU_OK 0x6f
398 #define DR_CPU_ERROR 0x65
399
400 __u32 num_records;
401 };
402
403 struct dr_cpu_resp_entry {
404 __u32 cpu;
405 __u32 result;
406 #define DR_CPU_RES_OK 0x00
407 #define DR_CPU_RES_FAILURE 0x01
408 #define DR_CPU_RES_BLOCKED 0x02
409 #define DR_CPU_RES_CPU_NOT_RESPONDING 0x03
410 #define DR_CPU_RES_NOT_IN_MD 0x04
411
412 __u32 stat;
413 #define DR_CPU_STAT_NOT_PRESENT 0x00
414 #define DR_CPU_STAT_UNCONFIGURED 0x01
415 #define DR_CPU_STAT_CONFIGURED 0x02
416
417 __u32 str_off;
418 };
419
420 static void __dr_cpu_send_error(struct ds_info *dp,
421 struct ds_cap_state *cp,
422 struct ds_data *data)
423 {
424 struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
425 struct {
426 struct ds_data data;
427 struct dr_cpu_tag tag;
428 } pkt;
429 int msg_len;
430
431 memset(&pkt, 0, sizeof(pkt));
432 pkt.data.tag.type = DS_DATA;
433 pkt.data.handle = cp->handle;
434 pkt.tag.req_num = tag->req_num;
435 pkt.tag.type = DR_CPU_ERROR;
436 pkt.tag.num_records = 0;
437
438 msg_len = (sizeof(struct ds_data) +
439 sizeof(struct dr_cpu_tag));
440
441 pkt.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
442
443 __ds_send(dp->lp, &pkt, msg_len);
444 }
445
446 static void dr_cpu_send_error(struct ds_info *dp,
447 struct ds_cap_state *cp,
448 struct ds_data *data)
449 {
450 unsigned long flags;
451
452 spin_lock_irqsave(&ds_lock, flags);
453 __dr_cpu_send_error(dp, cp, data);
454 spin_unlock_irqrestore(&ds_lock, flags);
455 }
456
457 #define CPU_SENTINEL 0xffffffff
458
459 static void purge_dups(u32 *list, u32 num_ents)
460 {
461 unsigned int i;
462
463 for (i = 0; i < num_ents; i++) {
464 u32 cpu = list[i];
465 unsigned int j;
466
467 if (cpu == CPU_SENTINEL)
468 continue;
469
470 for (j = i + 1; j < num_ents; j++) {
471 if (list[j] == cpu)
472 list[j] = CPU_SENTINEL;
473 }
474 }
475 }
476
477 static int dr_cpu_size_response(int ncpus)
478 {
479 return (sizeof(struct ds_data) +
480 sizeof(struct dr_cpu_tag) +
481 (sizeof(struct dr_cpu_resp_entry) * ncpus));
482 }
483
484 static void dr_cpu_init_response(struct ds_data *resp, u64 req_num,
485 u64 handle, int resp_len, int ncpus,
486 cpumask_t *mask, u32 default_stat)
487 {
488 struct dr_cpu_resp_entry *ent;
489 struct dr_cpu_tag *tag;
490 int i, cpu;
491
492 tag = (struct dr_cpu_tag *) (resp + 1);
493 ent = (struct dr_cpu_resp_entry *) (tag + 1);
494
495 resp->tag.type = DS_DATA;
496 resp->tag.len = resp_len - sizeof(struct ds_msg_tag);
497 resp->handle = handle;
498 tag->req_num = req_num;
499 tag->type = DR_CPU_OK;
500 tag->num_records = ncpus;
501
502 i = 0;
503 for_each_cpu(cpu, mask) {
504 ent[i].cpu = cpu;
505 ent[i].result = DR_CPU_RES_OK;
506 ent[i].stat = default_stat;
507 i++;
508 }
509 BUG_ON(i != ncpus);
510 }
511
512 static void dr_cpu_mark(struct ds_data *resp, int cpu, int ncpus,
513 u32 res, u32 stat)
514 {
515 struct dr_cpu_resp_entry *ent;
516 struct dr_cpu_tag *tag;
517 int i;
518
519 tag = (struct dr_cpu_tag *) (resp + 1);
520 ent = (struct dr_cpu_resp_entry *) (tag + 1);
521
522 for (i = 0; i < ncpus; i++) {
523 if (ent[i].cpu != cpu)
524 continue;
525 ent[i].result = res;
526 ent[i].stat = stat;
527 break;
528 }
529 }
530
531 static int __cpuinit dr_cpu_configure(struct ds_info *dp,
532 struct ds_cap_state *cp,
533 u64 req_num,
534 cpumask_t *mask)
535 {
536 struct ds_data *resp;
537 int resp_len, ncpus, cpu;
538 unsigned long flags;
539
540 ncpus = cpumask_weight(mask);
541 resp_len = dr_cpu_size_response(ncpus);
542 resp = kzalloc(resp_len, GFP_KERNEL);
543 if (!resp)
544 return -ENOMEM;
545
546 dr_cpu_init_response(resp, req_num, cp->handle,
547 resp_len, ncpus, mask,
548 DR_CPU_STAT_CONFIGURED);
549
550 mdesc_populate_present_mask(mask);
551 mdesc_fill_in_cpu_data(mask);
552
553 for_each_cpu(cpu, mask) {
554 int err;
555
556 printk(KERN_INFO "ds-%llu: Starting cpu %d...\n",
557 dp->id, cpu);
558 err = cpu_up(cpu);
559 if (err) {
560 __u32 res = DR_CPU_RES_FAILURE;
561 __u32 stat = DR_CPU_STAT_UNCONFIGURED;
562
563 if (!cpu_present(cpu)) {
564 /* CPU not present in MD */
565 res = DR_CPU_RES_NOT_IN_MD;
566 stat = DR_CPU_STAT_NOT_PRESENT;
567 } else if (err == -ENODEV) {
568 /* CPU did not call in successfully */
569 res = DR_CPU_RES_CPU_NOT_RESPONDING;
570 }
571
572 printk(KERN_INFO "ds-%llu: CPU startup failed err=%d\n",
573 dp->id, err);
574 dr_cpu_mark(resp, cpu, ncpus, res, stat);
575 }
576 }
577
578 spin_lock_irqsave(&ds_lock, flags);
579 __ds_send(dp->lp, resp, resp_len);
580 spin_unlock_irqrestore(&ds_lock, flags);
581
582 kfree(resp);
583
584 /* Redistribute IRQs, taking into account the new cpus. */
585 fixup_irqs();
586
587 return 0;
588 }
589
590 static int dr_cpu_unconfigure(struct ds_info *dp,
591 struct ds_cap_state *cp,
592 u64 req_num,
593 cpumask_t *mask)
594 {
595 struct ds_data *resp;
596 int resp_len, ncpus, cpu;
597 unsigned long flags;
598
599 ncpus = cpumask_weight(mask);
600 resp_len = dr_cpu_size_response(ncpus);
601 resp = kzalloc(resp_len, GFP_KERNEL);
602 if (!resp)
603 return -ENOMEM;
604
605 dr_cpu_init_response(resp, req_num, cp->handle,
606 resp_len, ncpus, mask,
607 DR_CPU_STAT_UNCONFIGURED);
608
609 for_each_cpu(cpu, mask) {
610 int err;
611
612 printk(KERN_INFO "ds-%llu: Shutting down cpu %d...\n",
613 dp->id, cpu);
614 err = cpu_down(cpu);
615 if (err)
616 dr_cpu_mark(resp, cpu, ncpus,
617 DR_CPU_RES_FAILURE,
618 DR_CPU_STAT_CONFIGURED);
619 }
620
621 spin_lock_irqsave(&ds_lock, flags);
622 __ds_send(dp->lp, resp, resp_len);
623 spin_unlock_irqrestore(&ds_lock, flags);
624
625 kfree(resp);
626
627 return 0;
628 }
629
630 static void __cpuinit dr_cpu_data(struct ds_info *dp,
631 struct ds_cap_state *cp,
632 void *buf, int len)
633 {
634 struct ds_data *data = buf;
635 struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
636 u32 *cpu_list = (u32 *) (tag + 1);
637 u64 req_num = tag->req_num;
638 cpumask_t mask;
639 unsigned int i;
640 int err;
641
642 switch (tag->type) {
643 case DR_CPU_CONFIGURE:
644 case DR_CPU_UNCONFIGURE:
645 case DR_CPU_FORCE_UNCONFIGURE:
646 break;
647
648 default:
649 dr_cpu_send_error(dp, cp, data);
650 return;
651 }
652
653 purge_dups(cpu_list, tag->num_records);
654
655 cpumask_clear(&mask);
656 for (i = 0; i < tag->num_records; i++) {
657 if (cpu_list[i] == CPU_SENTINEL)
658 continue;
659
660 if (cpu_list[i] < nr_cpu_ids)
661 cpumask_set_cpu(cpu_list[i], &mask);
662 }
663
664 if (tag->type == DR_CPU_CONFIGURE)
665 err = dr_cpu_configure(dp, cp, req_num, &mask);
666 else
667 err = dr_cpu_unconfigure(dp, cp, req_num, &mask);
668
669 if (err)
670 dr_cpu_send_error(dp, cp, data);
671 }
672 #endif /* CONFIG_HOTPLUG_CPU */
673
674 struct ds_pri_msg {
675 __u64 req_num;
676 __u64 type;
677 #define DS_PRI_REQUEST 0x00
678 #define DS_PRI_DATA 0x01
679 #define DS_PRI_UPDATE 0x02
680 };
681
682 static void ds_pri_data(struct ds_info *dp,
683 struct ds_cap_state *cp,
684 void *buf, int len)
685 {
686 struct ds_data *dpkt = buf;
687 struct ds_pri_msg *rp;
688
689 rp = (struct ds_pri_msg *) (dpkt + 1);
690
691 printk(KERN_INFO "ds-%llu: PRI REQ [%llx:%llx], len=%d\n",
692 dp->id, rp->req_num, rp->type, len);
693 }
694
695 struct ds_var_hdr {
696 __u32 type;
697 #define DS_VAR_SET_REQ 0x00
698 #define DS_VAR_DELETE_REQ 0x01
699 #define DS_VAR_SET_RESP 0x02
700 #define DS_VAR_DELETE_RESP 0x03
701 };
702
703 struct ds_var_set_msg {
704 struct ds_var_hdr hdr;
705 char name_and_value[0];
706 };
707
708 struct ds_var_delete_msg {
709 struct ds_var_hdr hdr;
710 char name[0];
711 };
712
713 struct ds_var_resp {
714 struct ds_var_hdr hdr;
715 __u32 result;
716 #define DS_VAR_SUCCESS 0x00
717 #define DS_VAR_NO_SPACE 0x01
718 #define DS_VAR_INVALID_VAR 0x02
719 #define DS_VAR_INVALID_VAL 0x03
720 #define DS_VAR_NOT_PRESENT 0x04
721 };
722
723 static DEFINE_MUTEX(ds_var_mutex);
724 static int ds_var_doorbell;
725 static int ds_var_response;
726
727 static void ds_var_data(struct ds_info *dp,
728 struct ds_cap_state *cp,
729 void *buf, int len)
730 {
731 struct ds_data *dpkt = buf;
732 struct ds_var_resp *rp;
733
734 rp = (struct ds_var_resp *) (dpkt + 1);
735
736 if (rp->hdr.type != DS_VAR_SET_RESP &&
737 rp->hdr.type != DS_VAR_DELETE_RESP)
738 return;
739
740 ds_var_response = rp->result;
741 wmb();
742 ds_var_doorbell = 1;
743 }
744
745 void ldom_set_var(const char *var, const char *value)
746 {
747 struct ds_cap_state *cp;
748 struct ds_info *dp;
749 unsigned long flags;
750
751 spin_lock_irqsave(&ds_lock, flags);
752 cp = NULL;
753 for (dp = ds_info_list; dp; dp = dp->next) {
754 struct ds_cap_state *tmp;
755
756 tmp = find_cap_by_string(dp, "var-config");
757 if (tmp && tmp->state == CAP_STATE_REGISTERED) {
758 cp = tmp;
759 break;
760 }
761 }
762 if (!cp) {
763 for (dp = ds_info_list; dp; dp = dp->next) {
764 struct ds_cap_state *tmp;
765
766 tmp = find_cap_by_string(dp, "var-config-backup");
767 if (tmp && tmp->state == CAP_STATE_REGISTERED) {
768 cp = tmp;
769 break;
770 }
771 }
772 }
773 spin_unlock_irqrestore(&ds_lock, flags);
774
775 if (cp) {
776 union {
777 struct {
778 struct ds_data data;
779 struct ds_var_set_msg msg;
780 } header;
781 char all[512];
782 } pkt;
783 char *base, *p;
784 int msg_len, loops;
785
786 memset(&pkt, 0, sizeof(pkt));
787 pkt.header.data.tag.type = DS_DATA;
788 pkt.header.data.handle = cp->handle;
789 pkt.header.msg.hdr.type = DS_VAR_SET_REQ;
790 base = p = &pkt.header.msg.name_and_value[0];
791 strcpy(p, var);
792 p += strlen(var) + 1;
793 strcpy(p, value);
794 p += strlen(value) + 1;
795
796 msg_len = (sizeof(struct ds_data) +
797 sizeof(struct ds_var_set_msg) +
798 (p - base));
799 msg_len = (msg_len + 3) & ~3;
800 pkt.header.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
801
802 mutex_lock(&ds_var_mutex);
803
804 spin_lock_irqsave(&ds_lock, flags);
805 ds_var_doorbell = 0;
806 ds_var_response = -1;
807
808 __ds_send(dp->lp, &pkt, msg_len);
809 spin_unlock_irqrestore(&ds_lock, flags);
810
811 loops = 1000;
812 while (ds_var_doorbell == 0) {
813 if (loops-- < 0)
814 break;
815 barrier();
816 udelay(100);
817 }
818
819 mutex_unlock(&ds_var_mutex);
820
821 if (ds_var_doorbell == 0 ||
822 ds_var_response != DS_VAR_SUCCESS)
823 printk(KERN_ERR "ds-%llu: var-config [%s:%s] "
824 "failed, response(%d).\n",
825 dp->id, var, value,
826 ds_var_response);
827 } else {
828 printk(KERN_ERR PFX "var-config not registered so "
829 "could not set (%s) variable to (%s).\n",
830 var, value);
831 }
832 }
833
834 static char full_boot_str[256] __attribute__((aligned(32)));
835 static int reboot_data_supported;
836
837 void ldom_reboot(const char *boot_command)
838 {
839 /* Don't bother with any of this if the boot_command
840 * is empty.
841 */
842 if (boot_command && strlen(boot_command)) {
843 unsigned long len;
844
845 strcpy(full_boot_str, "boot ");
846 strcpy(full_boot_str + strlen("boot "), boot_command);
847 len = strlen(full_boot_str);
848
849 if (reboot_data_supported) {
850 unsigned long ra = kimage_addr_to_ra(full_boot_str);
851 unsigned long hv_ret;
852
853 hv_ret = sun4v_reboot_data_set(ra, len);
854 if (hv_ret != HV_EOK)
855 pr_err("SUN4V: Unable to set reboot data "
856 "hv_ret=%lu\n", hv_ret);
857 } else {
858 ldom_set_var("reboot-command", full_boot_str);
859 }
860 }
861 sun4v_mach_sir();
862 }
863
864 void ldom_power_off(void)
865 {
866 sun4v_mach_exit(0);
867 }
868
869 static void ds_conn_reset(struct ds_info *dp)
870 {
871 printk(KERN_ERR "ds-%llu: ds_conn_reset() from %p\n",
872 dp->id, __builtin_return_address(0));
873 }
874
875 static int register_services(struct ds_info *dp)
876 {
877 struct ldc_channel *lp = dp->lp;
878 int i;
879
880 for (i = 0; i < dp->num_ds_states; i++) {
881 struct {
882 struct ds_reg_req req;
883 u8 id_buf[256];
884 } pbuf;
885 struct ds_cap_state *cp = &dp->ds_states[i];
886 int err, msg_len;
887 u64 new_count;
888
889 if (cp->state == CAP_STATE_REGISTERED)
890 continue;
891
892 new_count = sched_clock() & 0xffffffff;
893 cp->handle = ((u64) i << 32) | new_count;
894
895 msg_len = (sizeof(struct ds_reg_req) +
896 strlen(cp->service_id));
897
898 memset(&pbuf, 0, sizeof(pbuf));
899 pbuf.req.tag.type = DS_REG_REQ;
900 pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag));
901 pbuf.req.handle = cp->handle;
902 pbuf.req.major = 1;
903 pbuf.req.minor = 0;
904 strcpy(pbuf.req.svc_id, cp->service_id);
905
906 err = __ds_send(lp, &pbuf, msg_len);
907 if (err > 0)
908 cp->state = CAP_STATE_REG_SENT;
909 }
910 return 0;
911 }
912
913 static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt)
914 {
915
916 if (dp->hs_state == DS_HS_START) {
917 if (pkt->type != DS_INIT_ACK)
918 goto conn_reset;
919
920 dp->hs_state = DS_HS_DONE;
921
922 return register_services(dp);
923 }
924
925 if (dp->hs_state != DS_HS_DONE)
926 goto conn_reset;
927
928 if (pkt->type == DS_REG_ACK) {
929 struct ds_reg_ack *ap = (struct ds_reg_ack *) pkt;
930 struct ds_cap_state *cp = find_cap(dp, ap->handle);
931
932 if (!cp) {
933 printk(KERN_ERR "ds-%llu: REG ACK for unknown "
934 "handle %llx\n", dp->id, ap->handle);
935 return 0;
936 }
937 printk(KERN_INFO "ds-%llu: Registered %s service.\n",
938 dp->id, cp->service_id);
939 cp->state = CAP_STATE_REGISTERED;
940 } else if (pkt->type == DS_REG_NACK) {
941 struct ds_reg_nack *np = (struct ds_reg_nack *) pkt;
942 struct ds_cap_state *cp = find_cap(dp, np->handle);
943
944 if (!cp) {
945 printk(KERN_ERR "ds-%llu: REG NACK for "
946 "unknown handle %llx\n",
947 dp->id, np->handle);
948 return 0;
949 }
950 cp->state = CAP_STATE_UNKNOWN;
951 }
952
953 return 0;
954
955 conn_reset:
956 ds_conn_reset(dp);
957 return -ECONNRESET;
958 }
959
960 static void __send_ds_nack(struct ds_info *dp, u64 handle)
961 {
962 struct ds_data_nack nack = {
963 .tag = {
964 .type = DS_NACK,
965 .len = (sizeof(struct ds_data_nack) -
966 sizeof(struct ds_msg_tag)),
967 },
968 .handle = handle,
969 .result = DS_INV_HDL,
970 };
971
972 __ds_send(dp->lp, &nack, sizeof(nack));
973 }
974
975 static LIST_HEAD(ds_work_list);
976 static DECLARE_WAIT_QUEUE_HEAD(ds_wait);
977
978 struct ds_queue_entry {
979 struct list_head list;
980 struct ds_info *dp;
981 int req_len;
982 int __pad;
983 u64 req[0];
984 };
985
986 static void process_ds_work(void)
987 {
988 struct ds_queue_entry *qp, *tmp;
989 unsigned long flags;
990 LIST_HEAD(todo);
991
992 spin_lock_irqsave(&ds_lock, flags);
993 list_splice_init(&ds_work_list, &todo);
994 spin_unlock_irqrestore(&ds_lock, flags);
995
996 list_for_each_entry_safe(qp, tmp, &todo, list) {
997 struct ds_data *dpkt = (struct ds_data *) qp->req;
998 struct ds_info *dp = qp->dp;
999 struct ds_cap_state *cp = find_cap(dp, dpkt->handle);
1000 int req_len = qp->req_len;
1001
1002 if (!cp) {
1003 printk(KERN_ERR "ds-%llu: Data for unknown "
1004 "handle %llu\n",
1005 dp->id, dpkt->handle);
1006
1007 spin_lock_irqsave(&ds_lock, flags);
1008 __send_ds_nack(dp, dpkt->handle);
1009 spin_unlock_irqrestore(&ds_lock, flags);
1010 } else {
1011 cp->data(dp, cp, dpkt, req_len);
1012 }
1013
1014 list_del(&qp->list);
1015 kfree(qp);
1016 }
1017 }
1018
1019 static int ds_thread(void *__unused)
1020 {
1021 DEFINE_WAIT(wait);
1022
1023 while (1) {
1024 prepare_to_wait(&ds_wait, &wait, TASK_INTERRUPTIBLE);
1025 if (list_empty(&ds_work_list))
1026 schedule();
1027 finish_wait(&ds_wait, &wait);
1028
1029 if (kthread_should_stop())
1030 break;
1031
1032 process_ds_work();
1033 }
1034
1035 return 0;
1036 }
1037
1038 static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len)
1039 {
1040 struct ds_data *dpkt = (struct ds_data *) pkt;
1041 struct ds_queue_entry *qp;
1042
1043 qp = kmalloc(sizeof(struct ds_queue_entry) + len, GFP_ATOMIC);
1044 if (!qp) {
1045 __send_ds_nack(dp, dpkt->handle);
1046 } else {
1047 qp->dp = dp;
1048 memcpy(&qp->req, pkt, len);
1049 list_add_tail(&qp->list, &ds_work_list);
1050 wake_up(&ds_wait);
1051 }
1052 return 0;
1053 }
1054
1055 static void ds_up(struct ds_info *dp)
1056 {
1057 struct ldc_channel *lp = dp->lp;
1058 struct ds_ver_req req;
1059 int err;
1060
1061 req.tag.type = DS_INIT_REQ;
1062 req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag);
1063 req.ver.major = 1;
1064 req.ver.minor = 0;
1065
1066 err = __ds_send(lp, &req, sizeof(req));
1067 if (err > 0)
1068 dp->hs_state = DS_HS_START;
1069 }
1070
1071 static void ds_reset(struct ds_info *dp)
1072 {
1073 int i;
1074
1075 dp->hs_state = 0;
1076
1077 for (i = 0; i < dp->num_ds_states; i++) {
1078 struct ds_cap_state *cp = &dp->ds_states[i];
1079
1080 cp->state = CAP_STATE_UNKNOWN;
1081 }
1082 }
1083
1084 static void ds_event(void *arg, int event)
1085 {
1086 struct ds_info *dp = arg;
1087 struct ldc_channel *lp = dp->lp;
1088 unsigned long flags;
1089 int err;
1090
1091 spin_lock_irqsave(&ds_lock, flags);
1092
1093 if (event == LDC_EVENT_UP) {
1094 ds_up(dp);
1095 spin_unlock_irqrestore(&ds_lock, flags);
1096 return;
1097 }
1098
1099 if (event == LDC_EVENT_RESET) {
1100 ds_reset(dp);
1101 spin_unlock_irqrestore(&ds_lock, flags);
1102 return;
1103 }
1104
1105 if (event != LDC_EVENT_DATA_READY) {
1106 printk(KERN_WARNING "ds-%llu: Unexpected LDC event %d\n",
1107 dp->id, event);
1108 spin_unlock_irqrestore(&ds_lock, flags);
1109 return;
1110 }
1111
1112 err = 0;
1113 while (1) {
1114 struct ds_msg_tag *tag;
1115
1116 err = ldc_read(lp, dp->rcv_buf, sizeof(*tag));
1117
1118 if (unlikely(err < 0)) {
1119 if (err == -ECONNRESET)
1120 ds_conn_reset(dp);
1121 break;
1122 }
1123 if (err == 0)
1124 break;
1125
1126 tag = dp->rcv_buf;
1127 err = ldc_read(lp, tag + 1, tag->len);
1128
1129 if (unlikely(err < 0)) {
1130 if (err == -ECONNRESET)
1131 ds_conn_reset(dp);
1132 break;
1133 }
1134 if (err < tag->len)
1135 break;
1136
1137 if (tag->type < DS_DATA)
1138 err = ds_handshake(dp, dp->rcv_buf);
1139 else
1140 err = ds_data(dp, dp->rcv_buf,
1141 sizeof(*tag) + err);
1142 if (err == -ECONNRESET)
1143 break;
1144 }
1145
1146 spin_unlock_irqrestore(&ds_lock, flags);
1147 }
1148
1149 static int __devinit ds_probe(struct vio_dev *vdev,
1150 const struct vio_device_id *id)
1151 {
1152 static int ds_version_printed;
1153 struct ldc_channel_config ds_cfg = {
1154 .event = ds_event,
1155 .mtu = 4096,
1156 .mode = LDC_MODE_STREAM,
1157 };
1158 struct mdesc_handle *hp;
1159 struct ldc_channel *lp;
1160 struct ds_info *dp;
1161 const u64 *val;
1162 int err, i;
1163
1164 if (ds_version_printed++ == 0)
1165 printk(KERN_INFO "%s", version);
1166
1167 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1168 err = -ENOMEM;
1169 if (!dp)
1170 goto out_err;
1171
1172 hp = mdesc_grab();
1173 val = mdesc_get_property(hp, vdev->mp, "id", NULL);
1174 if (val)
1175 dp->id = *val;
1176 mdesc_release(hp);
1177
1178 dp->rcv_buf = kzalloc(4096, GFP_KERNEL);
1179 if (!dp->rcv_buf)
1180 goto out_free_dp;
1181
1182 dp->rcv_buf_len = 4096;
1183
1184 dp->ds_states = kzalloc(sizeof(ds_states_template),
1185 GFP_KERNEL);
1186 if (!dp->ds_states)
1187 goto out_free_rcv_buf;
1188
1189 memcpy(dp->ds_states, ds_states_template,
1190 sizeof(ds_states_template));
1191 dp->num_ds_states = ARRAY_SIZE(ds_states_template);
1192
1193 for (i = 0; i < dp->num_ds_states; i++)
1194 dp->ds_states[i].handle = ((u64)i << 32);
1195
1196 ds_cfg.tx_irq = vdev->tx_irq;
1197 ds_cfg.rx_irq = vdev->rx_irq;
1198
1199 lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp);
1200 if (IS_ERR(lp)) {
1201 err = PTR_ERR(lp);
1202 goto out_free_ds_states;
1203 }
1204 dp->lp = lp;
1205
1206 err = ldc_bind(lp, "DS");
1207 if (err)
1208 goto out_free_ldc;
1209
1210 spin_lock_irq(&ds_lock);
1211 dp->next = ds_info_list;
1212 ds_info_list = dp;
1213 spin_unlock_irq(&ds_lock);
1214
1215 return err;
1216
1217 out_free_ldc:
1218 ldc_free(dp->lp);
1219
1220 out_free_ds_states:
1221 kfree(dp->ds_states);
1222
1223 out_free_rcv_buf:
1224 kfree(dp->rcv_buf);
1225
1226 out_free_dp:
1227 kfree(dp);
1228
1229 out_err:
1230 return err;
1231 }
1232
1233 static int ds_remove(struct vio_dev *vdev)
1234 {
1235 return 0;
1236 }
1237
1238 static const struct vio_device_id ds_match[] = {
1239 {
1240 .type = "domain-services-port",
1241 },
1242 {},
1243 };
1244
1245 static struct vio_driver ds_driver = {
1246 .id_table = ds_match,
1247 .probe = ds_probe,
1248 .remove = ds_remove,
1249 .driver = {
1250 .name = "ds",
1251 .owner = THIS_MODULE,
1252 }
1253 };
1254
1255 static int __init ds_init(void)
1256 {
1257 unsigned long hv_ret, major, minor;
1258
1259 if (tlb_type == hypervisor) {
1260 hv_ret = sun4v_get_version(HV_GRP_REBOOT_DATA, &major, &minor);
1261 if (hv_ret == HV_EOK) {
1262 pr_info("SUN4V: Reboot data supported (maj=%lu,min=%lu).\n",
1263 major, minor);
1264 reboot_data_supported = 1;
1265 }
1266 }
1267 kthread_run(ds_thread, NULL, "kldomd");
1268
1269 return vio_register_driver(&ds_driver);
1270 }
1271
1272 subsys_initcall(ds_init);