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eeepc-laptop: Register as a pci-hotplug device
[linux-2.6/linux-acpi-2.6.git] / arch / sparc / kernel / ds.c
blob4a700f4b79cebf068cba0c82ea22dcf6602ba74b
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/ldc.h>
19 #include <asm/vio.h>
20 #include <asm/mdesc.h>
21 #include <asm/head.h>
22 #include <asm/irq.h>
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
29 static char version[] __devinitdata =
30 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
31 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
32 MODULE_DESCRIPTION("Sun LDOM domain services driver");
33 MODULE_LICENSE("GPL");
34 MODULE_VERSION(DRV_MODULE_VERSION);
35
36 struct 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
60 struct ds_version {
61 __u16 major;
62 __u16 minor;
63 };
64
65 struct ds_ver_req {
66 struct ds_msg_tag tag;
67 struct ds_version ver;
68 };
69
70 struct ds_ver_ack {
71 struct ds_msg_tag tag;
72 __u16 minor;
73 };
74
75 struct ds_ver_nack {
76 struct ds_msg_tag tag;
77 __u16 major;
78 };
79
80 struct 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
88 struct ds_reg_ack {
89 struct ds_msg_tag tag;
90 __u64 handle;
91 __u16 minor;
92 };
93
94 struct ds_reg_nack {
95 struct ds_msg_tag tag;
96 __u64 handle;
97 __u16 major;
98 };
99
100 struct ds_unreg_req {
101 struct ds_msg_tag tag;
102 __u64 handle;
103 };
104
105 struct ds_unreg_ack {
106 struct ds_msg_tag tag;
107 __u64 handle;
108 };
109
110 struct ds_unreg_nack {
111 struct ds_msg_tag tag;
112 __u64 handle;
113 };
114
115 struct ds_data {
116 struct ds_msg_tag tag;
117 __u64 handle;
118 };
119
120 struct ds_data_nack {
121 struct ds_msg_tag tag;
122 __u64 handle;
123 __u64 result;
124 };
125
126 struct ds_info;
127 struct ds_cap_state {
128 __u64 handle;
129
130 void (*data)(struct ds_info *dp,
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 ds_info *dp, struct ds_cap_state *cp,
143 void *buf, int len);
144 static void domain_shutdown_data(struct ds_info *dp,
145 struct ds_cap_state *cp,
146 void *buf, int len);
147 static void domain_panic_data(struct ds_info *dp,
148 struct ds_cap_state *cp,
149 void *buf, int len);
150 #ifdef CONFIG_HOTPLUG_CPU
151 static void dr_cpu_data(struct ds_info *dp,
152 struct ds_cap_state *cp,
153 void *buf, int len);
154 #endif
155 static void ds_pri_data(struct ds_info *dp,
156 struct ds_cap_state *cp,
157 void *buf, int len);
158 static void ds_var_data(struct ds_info *dp,
159 struct ds_cap_state *cp,
160 void *buf, int len);
161
162 static struct ds_cap_state ds_states_template[] = {
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 u64 id;
204
205 void *rcv_buf;
206 int rcv_buf_len;
207
208 struct ds_cap_state *ds_states;
209 int num_ds_states;
210
211 struct ds_info *next;
212 };
213
214 static struct ds_info *ds_info_list;
215
216 static struct ds_cap_state *find_cap(struct ds_info *dp, u64 handle)
217 {
218 unsigned int index = handle >> 32;
219
220 if (index >= dp->num_ds_states)
221 return NULL;
222 return &dp->ds_states[index];
223 }
224
225 static struct ds_cap_state *find_cap_by_string(struct ds_info *dp,
226 const char *name)
227 {
228 int i;
229
230 for (i = 0; i < dp->num_ds_states; i++) {
231 if (strcmp(dp->ds_states[i].service_id, name))
232 continue;
233
234 return &dp->ds_states[i];
235 }
236 return NULL;
237 }
238
239 static int __ds_send(struct ldc_channel *lp, void *data, int len)
240 {
241 int err, limit = 1000;
242
243 err = -EINVAL;
244 while (limit-- > 0) {
245 err = ldc_write(lp, data, len);
246 if (!err || (err != -EAGAIN))
247 break;
248 udelay(1);
249 }
250
251 return err;
252 }
253
254 static int ds_send(struct ldc_channel *lp, void *data, int len)
255 {
256 unsigned long flags;
257 int err;
258
259 spin_lock_irqsave(&ds_lock, flags);
260 err = __ds_send(lp, data, len);
261 spin_unlock_irqrestore(&ds_lock, flags);
262
263 return err;
264 }
265
266 struct ds_md_update_req {
267 __u64 req_num;
268 };
269
270 struct ds_md_update_res {
271 __u64 req_num;
272 __u32 result;
273 };
274
275 static void md_update_data(struct ds_info *dp,
276 struct ds_cap_state *cp,
277 void *buf, int len)
278 {
279 struct ldc_channel *lp = dp->lp;
280 struct ds_data *dpkt = buf;
281 struct ds_md_update_req *rp;
282 struct {
283 struct ds_data data;
284 struct ds_md_update_res res;
285 } pkt;
286
287 rp = (struct ds_md_update_req *) (dpkt + 1);
288
289 printk(KERN_INFO "ds-%llu: Machine description update.\n", dp->id);
290
291 mdesc_update();
292
293 memset(&pkt, 0, sizeof(pkt));
294 pkt.data.tag.type = DS_DATA;
295 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
296 pkt.data.handle = cp->handle;
297 pkt.res.req_num = rp->req_num;
298 pkt.res.result = DS_OK;
299
300 ds_send(lp, &pkt, sizeof(pkt));
301 }
302
303 struct ds_shutdown_req {
304 __u64 req_num;
305 __u32 ms_delay;
306 };
307
308 struct ds_shutdown_res {
309 __u64 req_num;
310 __u32 result;
311 char reason[1];
312 };
313
314 static void domain_shutdown_data(struct ds_info *dp,
315 struct ds_cap_state *cp,
316 void *buf, int len)
317 {
318 struct ldc_channel *lp = dp->lp;
319 struct ds_data *dpkt = buf;
320 struct ds_shutdown_req *rp;
321 struct {
322 struct ds_data data;
323 struct ds_shutdown_res res;
324 } pkt;
325
326 rp = (struct ds_shutdown_req *) (dpkt + 1);
327
328 printk(KERN_ALERT "ds-%llu: Shutdown request from "
329 "LDOM manager received.\n", dp->id);
330
331 memset(&pkt, 0, sizeof(pkt));
332 pkt.data.tag.type = DS_DATA;
333 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
334 pkt.data.handle = cp->handle;
335 pkt.res.req_num = rp->req_num;
336 pkt.res.result = DS_OK;
337 pkt.res.reason[0] = 0;
338
339 ds_send(lp, &pkt, sizeof(pkt));
340
341 orderly_poweroff(true);
342 }
343
344 struct ds_panic_req {
345 __u64 req_num;
346 };
347
348 struct ds_panic_res {
349 __u64 req_num;
350 __u32 result;
351 char reason[1];
352 };
353
354 static void domain_panic_data(struct ds_info *dp,
355 struct ds_cap_state *cp,
356 void *buf, int len)
357 {
358 struct ldc_channel *lp = dp->lp;
359 struct ds_data *dpkt = buf;
360 struct ds_panic_req *rp;
361 struct {
362 struct ds_data data;
363 struct ds_panic_res res;
364 } pkt;
365
366 rp = (struct ds_panic_req *) (dpkt + 1);
367
368 printk(KERN_ALERT "ds-%llu: Panic request from "
369 "LDOM manager received.\n", dp->id);
370
371 memset(&pkt, 0, sizeof(pkt));
372 pkt.data.tag.type = DS_DATA;
373 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
374 pkt.data.handle = cp->handle;
375 pkt.res.req_num = rp->req_num;
376 pkt.res.result = DS_OK;
377 pkt.res.reason[0] = 0;
378
379 ds_send(lp, &pkt, sizeof(pkt));
380
381 panic("PANIC requested by LDOM manager.");
382 }
383
384 #ifdef CONFIG_HOTPLUG_CPU
385 struct dr_cpu_tag {
386 __u64 req_num;
387 __u32 type;
388 #define DR_CPU_CONFIGURE 0x43
389 #define DR_CPU_UNCONFIGURE 0x55
390 #define DR_CPU_FORCE_UNCONFIGURE 0x46
391 #define DR_CPU_STATUS 0x53
392
393 /* Responses */
394 #define DR_CPU_OK 0x6f
395 #define DR_CPU_ERROR 0x65
396
397 __u32 num_records;
398 };
399
400 struct dr_cpu_resp_entry {
401 __u32 cpu;
402 __u32 result;
403 #define DR_CPU_RES_OK 0x00
404 #define DR_CPU_RES_FAILURE 0x01
405 #define DR_CPU_RES_BLOCKED 0x02
406 #define DR_CPU_RES_CPU_NOT_RESPONDING 0x03
407 #define DR_CPU_RES_NOT_IN_MD 0x04
408
409 __u32 stat;
410 #define DR_CPU_STAT_NOT_PRESENT 0x00
411 #define DR_CPU_STAT_UNCONFIGURED 0x01
412 #define DR_CPU_STAT_CONFIGURED 0x02
413
414 __u32 str_off;
415 };
416
417 static void __dr_cpu_send_error(struct ds_info *dp,
418 struct ds_cap_state *cp,
419 struct ds_data *data)
420 {
421 struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
422 struct {
423 struct ds_data data;
424 struct dr_cpu_tag tag;
425 } pkt;
426 int msg_len;
427
428 memset(&pkt, 0, sizeof(pkt));
429 pkt.data.tag.type = DS_DATA;
430 pkt.data.handle = cp->handle;
431 pkt.tag.req_num = tag->req_num;
432 pkt.tag.type = DR_CPU_ERROR;
433 pkt.tag.num_records = 0;
434
435 msg_len = (sizeof(struct ds_data) +
436 sizeof(struct dr_cpu_tag));
437
438 pkt.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
439
440 __ds_send(dp->lp, &pkt, msg_len);
441 }
442
443 static void dr_cpu_send_error(struct ds_info *dp,
444 struct ds_cap_state *cp,
445 struct ds_data *data)
446 {
447 unsigned long flags;
448
449 spin_lock_irqsave(&ds_lock, flags);
450 __dr_cpu_send_error(dp, cp, data);
451 spin_unlock_irqrestore(&ds_lock, flags);
452 }
453
454 #define CPU_SENTINEL 0xffffffff
455
456 static void purge_dups(u32 *list, u32 num_ents)
457 {
458 unsigned int i;
459
460 for (i = 0; i < num_ents; i++) {
461 u32 cpu = list[i];
462 unsigned int j;
463
464 if (cpu == CPU_SENTINEL)
465 continue;
466
467 for (j = i + 1; j < num_ents; j++) {
468 if (list[j] == cpu)
469 list[j] = CPU_SENTINEL;
470 }
471 }
472 }
473
474 static int dr_cpu_size_response(int ncpus)
475 {
476 return (sizeof(struct ds_data) +
477 sizeof(struct dr_cpu_tag) +
478 (sizeof(struct dr_cpu_resp_entry) * ncpus));
479 }
480
481 static void dr_cpu_init_response(struct ds_data *resp, u64 req_num,
482 u64 handle, int resp_len, int ncpus,
483 cpumask_t *mask, u32 default_stat)
484 {
485 struct dr_cpu_resp_entry *ent;
486 struct dr_cpu_tag *tag;
487 int i, cpu;
488
489 tag = (struct dr_cpu_tag *) (resp + 1);
490 ent = (struct dr_cpu_resp_entry *) (tag + 1);
491
492 resp->tag.type = DS_DATA;
493 resp->tag.len = resp_len - sizeof(struct ds_msg_tag);
494 resp->handle = handle;
495 tag->req_num = req_num;
496 tag->type = DR_CPU_OK;
497 tag->num_records = ncpus;
498
499 i = 0;
500 for_each_cpu_mask(cpu, *mask) {
501 ent[i].cpu = cpu;
502 ent[i].result = DR_CPU_RES_OK;
503 ent[i].stat = default_stat;
504 i++;
505 }
506 BUG_ON(i != ncpus);
507 }
508
509 static void dr_cpu_mark(struct ds_data *resp, int cpu, int ncpus,
510 u32 res, u32 stat)
511 {
512 struct dr_cpu_resp_entry *ent;
513 struct dr_cpu_tag *tag;
514 int i;
515
516 tag = (struct dr_cpu_tag *) (resp + 1);
517 ent = (struct dr_cpu_resp_entry *) (tag + 1);
518
519 for (i = 0; i < ncpus; i++) {
520 if (ent[i].cpu != cpu)
521 continue;
522 ent[i].result = res;
523 ent[i].stat = stat;
524 break;
525 }
526 }
527
528 static int __cpuinit dr_cpu_configure(struct ds_info *dp,
529 struct ds_cap_state *cp,
530 u64 req_num,
531 cpumask_t *mask)
532 {
533 struct ds_data *resp;
534 int resp_len, ncpus, cpu;
535 unsigned long flags;
536
537 ncpus = cpus_weight(*mask);
538 resp_len = dr_cpu_size_response(ncpus);
539 resp = kzalloc(resp_len, GFP_KERNEL);
540 if (!resp)
541 return -ENOMEM;
542
543 dr_cpu_init_response(resp, req_num, cp->handle,
544 resp_len, ncpus, mask,
545 DR_CPU_STAT_CONFIGURED);
546
547 mdesc_populate_present_mask(mask);
548 mdesc_fill_in_cpu_data(mask);
549
550 for_each_cpu_mask(cpu, *mask) {
551 int err;
552
553 printk(KERN_INFO "ds-%llu: Starting cpu %d...\n",
554 dp->id, cpu);
555 err = cpu_up(cpu);
556 if (err) {
557 __u32 res = DR_CPU_RES_FAILURE;
558 __u32 stat = DR_CPU_STAT_UNCONFIGURED;
559
560 if (!cpu_present(cpu)) {
561 /* CPU not present in MD */
562 res = DR_CPU_RES_NOT_IN_MD;
563 stat = DR_CPU_STAT_NOT_PRESENT;
564 } else if (err == -ENODEV) {
565 /* CPU did not call in successfully */
566 res = DR_CPU_RES_CPU_NOT_RESPONDING;
567 }
568
569 printk(KERN_INFO "ds-%llu: CPU startup failed err=%d\n",
570 dp->id, err);
571 dr_cpu_mark(resp, cpu, ncpus, res, stat);
572 }
573 }
574
575 spin_lock_irqsave(&ds_lock, flags);
576 __ds_send(dp->lp, resp, resp_len);
577 spin_unlock_irqrestore(&ds_lock, flags);
578
579 kfree(resp);
580
581 /* Redistribute IRQs, taking into account the new cpus. */
582 fixup_irqs();
583
584 return 0;
585 }
586
587 static int dr_cpu_unconfigure(struct ds_info *dp,
588 struct ds_cap_state *cp,
589 u64 req_num,
590 cpumask_t *mask)
591 {
592 struct ds_data *resp;
593 int resp_len, ncpus, cpu;
594 unsigned long flags;
595
596 ncpus = cpus_weight(*mask);
597 resp_len = dr_cpu_size_response(ncpus);
598 resp = kzalloc(resp_len, GFP_KERNEL);
599 if (!resp)
600 return -ENOMEM;
601
602 dr_cpu_init_response(resp, req_num, cp->handle,
603 resp_len, ncpus, mask,
604 DR_CPU_STAT_UNCONFIGURED);
605
606 for_each_cpu_mask(cpu, *mask) {
607 int err;
608
609 printk(KERN_INFO "ds-%llu: Shutting down cpu %d...\n",
610 dp->id, cpu);
611 err = cpu_down(cpu);
612 if (err)
613 dr_cpu_mark(resp, cpu, ncpus,
614 DR_CPU_RES_FAILURE,
615 DR_CPU_STAT_CONFIGURED);
616 }
617
618 spin_lock_irqsave(&ds_lock, flags);
619 __ds_send(dp->lp, resp, resp_len);
620 spin_unlock_irqrestore(&ds_lock, flags);
621
622 kfree(resp);
623
624 return 0;
625 }
626
627 static void __cpuinit dr_cpu_data(struct ds_info *dp,
628 struct ds_cap_state *cp,
629 void *buf, int len)
630 {
631 struct ds_data *data = buf;
632 struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
633 u32 *cpu_list = (u32 *) (tag + 1);
634 u64 req_num = tag->req_num;
635 cpumask_t mask;
636 unsigned int i;
637 int err;
638
639 switch (tag->type) {
640 case DR_CPU_CONFIGURE:
641 case DR_CPU_UNCONFIGURE:
642 case DR_CPU_FORCE_UNCONFIGURE:
643 break;
644
645 default:
646 dr_cpu_send_error(dp, cp, data);
647 return;
648 }
649
650 purge_dups(cpu_list, tag->num_records);
651
652 cpus_clear(mask);
653 for (i = 0; i < tag->num_records; i++) {
654 if (cpu_list[i] == CPU_SENTINEL)
655 continue;
656
657 if (cpu_list[i] < nr_cpu_ids)
658 cpu_set(cpu_list[i], mask);
659 }
660
661 if (tag->type == DR_CPU_CONFIGURE)
662 err = dr_cpu_configure(dp, cp, req_num, &mask);
663 else
664 err = dr_cpu_unconfigure(dp, cp, req_num, &mask);
665
666 if (err)
667 dr_cpu_send_error(dp, cp, data);
668 }
669 #endif /* CONFIG_HOTPLUG_CPU */
670
671 struct ds_pri_msg {
672 __u64 req_num;
673 __u64 type;
674 #define DS_PRI_REQUEST 0x00
675 #define DS_PRI_DATA 0x01
676 #define DS_PRI_UPDATE 0x02
677 };
678
679 static void ds_pri_data(struct ds_info *dp,
680 struct ds_cap_state *cp,
681 void *buf, int len)
682 {
683 struct ds_data *dpkt = buf;
684 struct ds_pri_msg *rp;
685
686 rp = (struct ds_pri_msg *) (dpkt + 1);
687
688 printk(KERN_INFO "ds-%llu: PRI REQ [%llx:%llx], len=%d\n",
689 dp->id, rp->req_num, rp->type, len);
690 }
691
692 struct ds_var_hdr {
693 __u32 type;
694 #define DS_VAR_SET_REQ 0x00
695 #define DS_VAR_DELETE_REQ 0x01
696 #define DS_VAR_SET_RESP 0x02
697 #define DS_VAR_DELETE_RESP 0x03
698 };
699
700 struct ds_var_set_msg {
701 struct ds_var_hdr hdr;
702 char name_and_value[0];
703 };
704
705 struct ds_var_delete_msg {
706 struct ds_var_hdr hdr;
707 char name[0];
708 };
709
710 struct ds_var_resp {
711 struct ds_var_hdr hdr;
712 __u32 result;
713 #define DS_VAR_SUCCESS 0x00
714 #define DS_VAR_NO_SPACE 0x01
715 #define DS_VAR_INVALID_VAR 0x02
716 #define DS_VAR_INVALID_VAL 0x03
717 #define DS_VAR_NOT_PRESENT 0x04
718 };
719
720 static DEFINE_MUTEX(ds_var_mutex);
721 static int ds_var_doorbell;
722 static int ds_var_response;
723
724 static void ds_var_data(struct ds_info *dp,
725 struct ds_cap_state *cp,
726 void *buf, int len)
727 {
728 struct ds_data *dpkt = buf;
729 struct ds_var_resp *rp;
730
731 rp = (struct ds_var_resp *) (dpkt + 1);
732
733 if (rp->hdr.type != DS_VAR_SET_RESP &&
734 rp->hdr.type != DS_VAR_DELETE_RESP)
735 return;
736
737 ds_var_response = rp->result;
738 wmb();
739 ds_var_doorbell = 1;
740 }
741
742 void ldom_set_var(const char *var, const char *value)
743 {
744 struct ds_cap_state *cp;
745 struct ds_info *dp;
746 unsigned long flags;
747
748 spin_lock_irqsave(&ds_lock, flags);
749 cp = NULL;
750 for (dp = ds_info_list; dp; dp = dp->next) {
751 struct ds_cap_state *tmp;
752
753 tmp = find_cap_by_string(dp, "var-config");
754 if (tmp && tmp->state == CAP_STATE_REGISTERED) {
755 cp = tmp;
756 break;
757 }
758 }
759 if (!cp) {
760 for (dp = ds_info_list; dp; dp = dp->next) {
761 struct ds_cap_state *tmp;
762
763 tmp = find_cap_by_string(dp, "var-config-backup");
764 if (tmp && tmp->state == CAP_STATE_REGISTERED) {
765 cp = tmp;
766 break;
767 }
768 }
769 }
770 spin_unlock_irqrestore(&ds_lock, flags);
771
772 if (cp) {
773 union {
774 struct {
775 struct ds_data data;
776 struct ds_var_set_msg msg;
777 } header;
778 char all[512];
779 } pkt;
780 char *base, *p;
781 int msg_len, loops;
782
783 memset(&pkt, 0, sizeof(pkt));
784 pkt.header.data.tag.type = DS_DATA;
785 pkt.header.data.handle = cp->handle;
786 pkt.header.msg.hdr.type = DS_VAR_SET_REQ;
787 base = p = &pkt.header.msg.name_and_value[0];
788 strcpy(p, var);
789 p += strlen(var) + 1;
790 strcpy(p, value);
791 p += strlen(value) + 1;
792
793 msg_len = (sizeof(struct ds_data) +
794 sizeof(struct ds_var_set_msg) +
795 (p - base));
796 msg_len = (msg_len + 3) & ~3;
797 pkt.header.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
798
799 mutex_lock(&ds_var_mutex);
800
801 spin_lock_irqsave(&ds_lock, flags);
802 ds_var_doorbell = 0;
803 ds_var_response = -1;
804
805 __ds_send(dp->lp, &pkt, msg_len);
806 spin_unlock_irqrestore(&ds_lock, flags);
807
808 loops = 1000;
809 while (ds_var_doorbell == 0) {
810 if (loops-- < 0)
811 break;
812 barrier();
813 udelay(100);
814 }
815
816 mutex_unlock(&ds_var_mutex);
817
818 if (ds_var_doorbell == 0 ||
819 ds_var_response != DS_VAR_SUCCESS)
820 printk(KERN_ERR "ds-%llu: var-config [%s:%s] "
821 "failed, response(%d).\n",
822 dp->id, var, value,
823 ds_var_response);
824 } else {
825 printk(KERN_ERR PFX "var-config not registered so "
826 "could not set (%s) variable to (%s).\n",
827 var, value);
828 }
829 }
830
831 void ldom_reboot(const char *boot_command)
832 {
833 /* Don't bother with any of this if the boot_command
834 * is empty.
835 */
836 if (boot_command && strlen(boot_command)) {
837 char full_boot_str[256];
838
839 strcpy(full_boot_str, "boot ");
840 strcpy(full_boot_str + strlen("boot "), boot_command);
841
842 ldom_set_var("reboot-command", full_boot_str);
843 }
844 sun4v_mach_sir();
845 }
846
847 void ldom_power_off(void)
848 {
849 sun4v_mach_exit(0);
850 }
851
852 static void ds_conn_reset(struct ds_info *dp)
853 {
854 printk(KERN_ERR "ds-%llu: ds_conn_reset() from %p\n",
855 dp->id, __builtin_return_address(0));
856 }
857
858 static int register_services(struct ds_info *dp)
859 {
860 struct ldc_channel *lp = dp->lp;
861 int i;
862
863 for (i = 0; i < dp->num_ds_states; i++) {
864 struct {
865 struct ds_reg_req req;
866 u8 id_buf[256];
867 } pbuf;
868 struct ds_cap_state *cp = &dp->ds_states[i];
869 int err, msg_len;
870 u64 new_count;
871
872 if (cp->state == CAP_STATE_REGISTERED)
873 continue;
874
875 new_count = sched_clock() & 0xffffffff;
876 cp->handle = ((u64) i << 32) | new_count;
877
878 msg_len = (sizeof(struct ds_reg_req) +
879 strlen(cp->service_id));
880
881 memset(&pbuf, 0, sizeof(pbuf));
882 pbuf.req.tag.type = DS_REG_REQ;
883 pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag));
884 pbuf.req.handle = cp->handle;
885 pbuf.req.major = 1;
886 pbuf.req.minor = 0;
887 strcpy(pbuf.req.svc_id, cp->service_id);
888
889 err = __ds_send(lp, &pbuf, msg_len);
890 if (err > 0)
891 cp->state = CAP_STATE_REG_SENT;
892 }
893 return 0;
894 }
895
896 static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt)
897 {
898
899 if (dp->hs_state == DS_HS_START) {
900 if (pkt->type != DS_INIT_ACK)
901 goto conn_reset;
902
903 dp->hs_state = DS_HS_DONE;
904
905 return register_services(dp);
906 }
907
908 if (dp->hs_state != DS_HS_DONE)
909 goto conn_reset;
910
911 if (pkt->type == DS_REG_ACK) {
912 struct ds_reg_ack *ap = (struct ds_reg_ack *) pkt;
913 struct ds_cap_state *cp = find_cap(dp, ap->handle);
914
915 if (!cp) {
916 printk(KERN_ERR "ds-%llu: REG ACK for unknown "
917 "handle %llx\n", dp->id, ap->handle);
918 return 0;
919 }
920 printk(KERN_INFO "ds-%llu: Registered %s service.\n",
921 dp->id, cp->service_id);
922 cp->state = CAP_STATE_REGISTERED;
923 } else if (pkt->type == DS_REG_NACK) {
924 struct ds_reg_nack *np = (struct ds_reg_nack *) pkt;
925 struct ds_cap_state *cp = find_cap(dp, np->handle);
926
927 if (!cp) {
928 printk(KERN_ERR "ds-%llu: REG NACK for "
929 "unknown handle %llx\n",
930 dp->id, np->handle);
931 return 0;
932 }
933 cp->state = CAP_STATE_UNKNOWN;
934 }
935
936 return 0;
937
938 conn_reset:
939 ds_conn_reset(dp);
940 return -ECONNRESET;
941 }
942
943 static void __send_ds_nack(struct ds_info *dp, u64 handle)
944 {
945 struct ds_data_nack nack = {
946 .tag = {
947 .type = DS_NACK,
948 .len = (sizeof(struct ds_data_nack) -
949 sizeof(struct ds_msg_tag)),
950 },
951 .handle = handle,
952 .result = DS_INV_HDL,
953 };
954
955 __ds_send(dp->lp, &nack, sizeof(nack));
956 }
957
958 static LIST_HEAD(ds_work_list);
959 static DECLARE_WAIT_QUEUE_HEAD(ds_wait);
960
961 struct ds_queue_entry {
962 struct list_head list;
963 struct ds_info *dp;
964 int req_len;
965 int __pad;
966 u64 req[0];
967 };
968
969 static void process_ds_work(void)
970 {
971 struct ds_queue_entry *qp, *tmp;
972 unsigned long flags;
973 LIST_HEAD(todo);
974
975 spin_lock_irqsave(&ds_lock, flags);
976 list_splice_init(&ds_work_list, &todo);
977 spin_unlock_irqrestore(&ds_lock, flags);
978
979 list_for_each_entry_safe(qp, tmp, &todo, list) {
980 struct ds_data *dpkt = (struct ds_data *) qp->req;
981 struct ds_info *dp = qp->dp;
982 struct ds_cap_state *cp = find_cap(dp, dpkt->handle);
983 int req_len = qp->req_len;
984
985 if (!cp) {
986 printk(KERN_ERR "ds-%llu: Data for unknown "
987 "handle %llu\n",
988 dp->id, dpkt->handle);
989
990 spin_lock_irqsave(&ds_lock, flags);
991 __send_ds_nack(dp, dpkt->handle);
992 spin_unlock_irqrestore(&ds_lock, flags);
993 } else {
994 cp->data(dp, cp, dpkt, req_len);
995 }
996
997 list_del(&qp->list);
998 kfree(qp);
999 }
1000 }
1001
1002 static int ds_thread(void *__unused)
1003 {
1004 DEFINE_WAIT(wait);
1005
1006 while (1) {
1007 prepare_to_wait(&ds_wait, &wait, TASK_INTERRUPTIBLE);
1008 if (list_empty(&ds_work_list))
1009 schedule();
1010 finish_wait(&ds_wait, &wait);
1011
1012 if (kthread_should_stop())
1013 break;
1014
1015 process_ds_work();
1016 }
1017
1018 return 0;
1019 }
1020
1021 static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len)
1022 {
1023 struct ds_data *dpkt = (struct ds_data *) pkt;
1024 struct ds_queue_entry *qp;
1025
1026 qp = kmalloc(sizeof(struct ds_queue_entry) + len, GFP_ATOMIC);
1027 if (!qp) {
1028 __send_ds_nack(dp, dpkt->handle);
1029 } else {
1030 qp->dp = dp;
1031 memcpy(&qp->req, pkt, len);
1032 list_add_tail(&qp->list, &ds_work_list);
1033 wake_up(&ds_wait);
1034 }
1035 return 0;
1036 }
1037
1038 static void ds_up(struct ds_info *dp)
1039 {
1040 struct ldc_channel *lp = dp->lp;
1041 struct ds_ver_req req;
1042 int err;
1043
1044 req.tag.type = DS_INIT_REQ;
1045 req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag);
1046 req.ver.major = 1;
1047 req.ver.minor = 0;
1048
1049 err = __ds_send(lp, &req, sizeof(req));
1050 if (err > 0)
1051 dp->hs_state = DS_HS_START;
1052 }
1053
1054 static void ds_reset(struct ds_info *dp)
1055 {
1056 int i;
1057
1058 dp->hs_state = 0;
1059
1060 for (i = 0; i < dp->num_ds_states; i++) {
1061 struct ds_cap_state *cp = &dp->ds_states[i];
1062
1063 cp->state = CAP_STATE_UNKNOWN;
1064 }
1065 }
1066
1067 static void ds_event(void *arg, int event)
1068 {
1069 struct ds_info *dp = arg;
1070 struct ldc_channel *lp = dp->lp;
1071 unsigned long flags;
1072 int err;
1073
1074 spin_lock_irqsave(&ds_lock, flags);
1075
1076 if (event == LDC_EVENT_UP) {
1077 ds_up(dp);
1078 spin_unlock_irqrestore(&ds_lock, flags);
1079 return;
1080 }
1081
1082 if (event == LDC_EVENT_RESET) {
1083 ds_reset(dp);
1084 spin_unlock_irqrestore(&ds_lock, flags);
1085 return;
1086 }
1087
1088 if (event != LDC_EVENT_DATA_READY) {
1089 printk(KERN_WARNING "ds-%llu: Unexpected LDC event %d\n",
1090 dp->id, event);
1091 spin_unlock_irqrestore(&ds_lock, flags);
1092 return;
1093 }
1094
1095 err = 0;
1096 while (1) {
1097 struct ds_msg_tag *tag;
1098
1099 err = ldc_read(lp, dp->rcv_buf, sizeof(*tag));
1100
1101 if (unlikely(err < 0)) {
1102 if (err == -ECONNRESET)
1103 ds_conn_reset(dp);
1104 break;
1105 }
1106 if (err == 0)
1107 break;
1108
1109 tag = dp->rcv_buf;
1110 err = ldc_read(lp, tag + 1, tag->len);
1111
1112 if (unlikely(err < 0)) {
1113 if (err == -ECONNRESET)
1114 ds_conn_reset(dp);
1115 break;
1116 }
1117 if (err < tag->len)
1118 break;
1119
1120 if (tag->type < DS_DATA)
1121 err = ds_handshake(dp, dp->rcv_buf);
1122 else
1123 err = ds_data(dp, dp->rcv_buf,
1124 sizeof(*tag) + err);
1125 if (err == -ECONNRESET)
1126 break;
1127 }
1128
1129 spin_unlock_irqrestore(&ds_lock, flags);
1130 }
1131
1132 static int __devinit ds_probe(struct vio_dev *vdev,
1133 const struct vio_device_id *id)
1134 {
1135 static int ds_version_printed;
1136 struct ldc_channel_config ds_cfg = {
1137 .event = ds_event,
1138 .mtu = 4096,
1139 .mode = LDC_MODE_STREAM,
1140 };
1141 struct mdesc_handle *hp;
1142 struct ldc_channel *lp;
1143 struct ds_info *dp;
1144 const u64 *val;
1145 int err, i;
1146
1147 if (ds_version_printed++ == 0)
1148 printk(KERN_INFO "%s", version);
1149
1150 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1151 err = -ENOMEM;
1152 if (!dp)
1153 goto out_err;
1154
1155 hp = mdesc_grab();
1156 val = mdesc_get_property(hp, vdev->mp, "id", NULL);
1157 if (val)
1158 dp->id = *val;
1159 mdesc_release(hp);
1160
1161 dp->rcv_buf = kzalloc(4096, GFP_KERNEL);
1162 if (!dp->rcv_buf)
1163 goto out_free_dp;
1164
1165 dp->rcv_buf_len = 4096;
1166
1167 dp->ds_states = kzalloc(sizeof(ds_states_template),
1168 GFP_KERNEL);
1169 if (!dp->ds_states)
1170 goto out_free_rcv_buf;
1171
1172 memcpy(dp->ds_states, ds_states_template,
1173 sizeof(ds_states_template));
1174 dp->num_ds_states = ARRAY_SIZE(ds_states_template);
1175
1176 for (i = 0; i < dp->num_ds_states; i++)
1177 dp->ds_states[i].handle = ((u64)i << 32);
1178
1179 ds_cfg.tx_irq = vdev->tx_irq;
1180 ds_cfg.rx_irq = vdev->rx_irq;
1181
1182 lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp);
1183 if (IS_ERR(lp)) {
1184 err = PTR_ERR(lp);
1185 goto out_free_ds_states;
1186 }
1187 dp->lp = lp;
1188
1189 err = ldc_bind(lp, "DS");
1190 if (err)
1191 goto out_free_ldc;
1192
1193 spin_lock_irq(&ds_lock);
1194 dp->next = ds_info_list;
1195 ds_info_list = dp;
1196 spin_unlock_irq(&ds_lock);
1197
1198 return err;
1199
1200 out_free_ldc:
1201 ldc_free(dp->lp);
1202
1203 out_free_ds_states:
1204 kfree(dp->ds_states);
1205
1206 out_free_rcv_buf:
1207 kfree(dp->rcv_buf);
1208
1209 out_free_dp:
1210 kfree(dp);
1211
1212 out_err:
1213 return err;
1214 }
1215
1216 static int ds_remove(struct vio_dev *vdev)
1217 {
1218 return 0;
1219 }
1220
1221 static struct vio_device_id __initdata ds_match[] = {
1222 {
1223 .type = "domain-services-port",
1224 },
1225 {},
1226 };
1227
1228 static struct vio_driver ds_driver = {
1229 .id_table = ds_match,
1230 .probe = ds_probe,
1231 .remove = ds_remove,
1232 .driver = {
1233 .name = "ds",
1234 .owner = THIS_MODULE,
1235 }
1236 };
1237
1238 static int __init ds_init(void)
1239 {
1240 kthread_run(ds_thread, NULL, "kldomd");
1241
1242 return vio_register_driver(&ds_driver);
1243 }
1244
1245 subsys_initcall(ds_init);
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