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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / arch / sparc64 / kernel / ds.c
blobedb74f5a1186ebd82f973378e961de4a7e64d7fe
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/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 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-%lu: 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-%lu: 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-%lu: 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_fill_in_cpu_data(*mask);
548
549 for_each_cpu_mask(cpu, *mask) {
550 int err;
551
552 printk(KERN_INFO "ds-%lu: Starting cpu %d...\n",
553 dp->id, cpu);
554 err = cpu_up(cpu);
555 if (err) {
556 __u32 res = DR_CPU_RES_FAILURE;
557 __u32 stat = DR_CPU_STAT_UNCONFIGURED;
558
559 if (!cpu_present(cpu)) {
560 /* CPU not present in MD */
561 res = DR_CPU_RES_NOT_IN_MD;
562 stat = DR_CPU_STAT_NOT_PRESENT;
563 } else if (err == -ENODEV) {
564 /* CPU did not call in successfully */
565 res = DR_CPU_RES_CPU_NOT_RESPONDING;
566 }
567
568 printk(KERN_INFO "ds-%lu: CPU startup failed err=%d\n",
569 dp->id, err);
570 dr_cpu_mark(resp, cpu, ncpus, res, stat);
571 }
572 }
573
574 spin_lock_irqsave(&ds_lock, flags);
575 __ds_send(dp->lp, resp, resp_len);
576 spin_unlock_irqrestore(&ds_lock, flags);
577
578 kfree(resp);
579
580 /* Redistribute IRQs, taking into account the new cpus. */
581 fixup_irqs();
582
583 return 0;
584 }
585
586 static int dr_cpu_unconfigure(struct ds_info *dp,
587 struct ds_cap_state *cp,
588 u64 req_num,
589 cpumask_t *mask)
590 {
591 struct ds_data *resp;
592 int resp_len, ncpus, cpu;
593 unsigned long flags;
594
595 ncpus = cpus_weight(*mask);
596 resp_len = dr_cpu_size_response(ncpus);
597 resp = kzalloc(resp_len, GFP_KERNEL);
598 if (!resp)
599 return -ENOMEM;
600
601 dr_cpu_init_response(resp, req_num, cp->handle,
602 resp_len, ncpus, mask,
603 DR_CPU_STAT_UNCONFIGURED);
604
605 for_each_cpu_mask(cpu, *mask) {
606 int err;
607
608 printk(KERN_INFO "ds-%lu: Shutting down cpu %d...\n",
609 dp->id, cpu);
610 err = cpu_down(cpu);
611 if (err)
612 dr_cpu_mark(resp, cpu, ncpus,
613 DR_CPU_RES_FAILURE,
614 DR_CPU_STAT_CONFIGURED);
615 }
616
617 spin_lock_irqsave(&ds_lock, flags);
618 __ds_send(dp->lp, resp, resp_len);
619 spin_unlock_irqrestore(&ds_lock, flags);
620
621 kfree(resp);
622
623 return 0;
624 }
625
626 static void __cpuinit dr_cpu_data(struct ds_info *dp,
627 struct ds_cap_state *cp,
628 void *buf, int len)
629 {
630 struct ds_data *data = buf;
631 struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
632 u32 *cpu_list = (u32 *) (tag + 1);
633 u64 req_num = tag->req_num;
634 cpumask_t mask;
635 unsigned int i;
636 int err;
637
638 switch (tag->type) {
639 case DR_CPU_CONFIGURE:
640 case DR_CPU_UNCONFIGURE:
641 case DR_CPU_FORCE_UNCONFIGURE:
642 break;
643
644 default:
645 dr_cpu_send_error(dp, cp, data);
646 return;
647 }
648
649 purge_dups(cpu_list, tag->num_records);
650
651 cpus_clear(mask);
652 for (i = 0; i < tag->num_records; i++) {
653 if (cpu_list[i] == CPU_SENTINEL)
654 continue;
655
656 if (cpu_list[i] < NR_CPUS)
657 cpu_set(cpu_list[i], mask);
658 }
659
660 if (tag->type == DR_CPU_CONFIGURE)
661 err = dr_cpu_configure(dp, cp, req_num, &mask);
662 else
663 err = dr_cpu_unconfigure(dp, cp, req_num, &mask);
664
665 if (err)
666 dr_cpu_send_error(dp, cp, data);
667 }
668 #endif /* CONFIG_HOTPLUG_CPU */
669
670 struct ds_pri_msg {
671 __u64 req_num;
672 __u64 type;
673 #define DS_PRI_REQUEST 0x00
674 #define DS_PRI_DATA 0x01
675 #define DS_PRI_UPDATE 0x02
676 };
677
678 static void ds_pri_data(struct ds_info *dp,
679 struct ds_cap_state *cp,
680 void *buf, int len)
681 {
682 struct ds_data *dpkt = buf;
683 struct ds_pri_msg *rp;
684
685 rp = (struct ds_pri_msg *) (dpkt + 1);
686
687 printk(KERN_INFO "ds-%lu: PRI REQ [%lx:%lx], len=%d\n",
688 dp->id, rp->req_num, rp->type, len);
689 }
690
691 struct ds_var_hdr {
692 __u32 type;
693 #define DS_VAR_SET_REQ 0x00
694 #define DS_VAR_DELETE_REQ 0x01
695 #define DS_VAR_SET_RESP 0x02
696 #define DS_VAR_DELETE_RESP 0x03
697 };
698
699 struct ds_var_set_msg {
700 struct ds_var_hdr hdr;
701 char name_and_value[0];
702 };
703
704 struct ds_var_delete_msg {
705 struct ds_var_hdr hdr;
706 char name[0];
707 };
708
709 struct ds_var_resp {
710 struct ds_var_hdr hdr;
711 __u32 result;
712 #define DS_VAR_SUCCESS 0x00
713 #define DS_VAR_NO_SPACE 0x01
714 #define DS_VAR_INVALID_VAR 0x02
715 #define DS_VAR_INVALID_VAL 0x03
716 #define DS_VAR_NOT_PRESENT 0x04
717 };
718
719 static DEFINE_MUTEX(ds_var_mutex);
720 static int ds_var_doorbell;
721 static int ds_var_response;
722
723 static void ds_var_data(struct ds_info *dp,
724 struct ds_cap_state *cp,
725 void *buf, int len)
726 {
727 struct ds_data *dpkt = buf;
728 struct ds_var_resp *rp;
729
730 rp = (struct ds_var_resp *) (dpkt + 1);
731
732 if (rp->hdr.type != DS_VAR_SET_RESP &&
733 rp->hdr.type != DS_VAR_DELETE_RESP)
734 return;
735
736 ds_var_response = rp->result;
737 wmb();
738 ds_var_doorbell = 1;
739 }
740
741 void ldom_set_var(const char *var, const char *value)
742 {
743 struct ds_cap_state *cp;
744 struct ds_info *dp;
745 unsigned long flags;
746
747 spin_lock_irqsave(&ds_lock, flags);
748 cp = NULL;
749 for (dp = ds_info_list; dp; dp = dp->next) {
750 struct ds_cap_state *tmp;
751
752 tmp = find_cap_by_string(dp, "var-config");
753 if (tmp && tmp->state == CAP_STATE_REGISTERED) {
754 cp = tmp;
755 break;
756 }
757 }
758 if (!cp) {
759 for (dp = ds_info_list; dp; dp = dp->next) {
760 struct ds_cap_state *tmp;
761
762 tmp = find_cap_by_string(dp, "var-config-backup");
763 if (tmp && tmp->state == CAP_STATE_REGISTERED) {
764 cp = tmp;
765 break;
766 }
767 }
768 }
769 spin_unlock_irqrestore(&ds_lock, flags);
770
771 if (cp) {
772 union {
773 struct {
774 struct ds_data data;
775 struct ds_var_set_msg msg;
776 } header;
777 char all[512];
778 } pkt;
779 char *base, *p;
780 int msg_len, loops;
781
782 memset(&pkt, 0, sizeof(pkt));
783 pkt.header.data.tag.type = DS_DATA;
784 pkt.header.data.handle = cp->handle;
785 pkt.header.msg.hdr.type = DS_VAR_SET_REQ;
786 base = p = &pkt.header.msg.name_and_value[0];
787 strcpy(p, var);
788 p += strlen(var) + 1;
789 strcpy(p, value);
790 p += strlen(value) + 1;
791
792 msg_len = (sizeof(struct ds_data) +
793 sizeof(struct ds_var_set_msg) +
794 (p - base));
795 msg_len = (msg_len + 3) & ~3;
796 pkt.header.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
797
798 mutex_lock(&ds_var_mutex);
799
800 spin_lock_irqsave(&ds_lock, flags);
801 ds_var_doorbell = 0;
802 ds_var_response = -1;
803
804 __ds_send(dp->lp, &pkt, msg_len);
805 spin_unlock_irqrestore(&ds_lock, flags);
806
807 loops = 1000;
808 while (ds_var_doorbell == 0) {
809 if (loops-- < 0)
810 break;
811 barrier();
812 udelay(100);
813 }
814
815 mutex_unlock(&ds_var_mutex);
816
817 if (ds_var_doorbell == 0 ||
818 ds_var_response != DS_VAR_SUCCESS)
819 printk(KERN_ERR "ds-%lu: var-config [%s:%s] "
820 "failed, response(%d).\n",
821 dp->id, var, value,
822 ds_var_response);
823 } else {
824 printk(KERN_ERR PFX "var-config not registered so "
825 "could not set (%s) variable to (%s).\n",
826 var, value);
827 }
828 }
829
830 void ldom_reboot(const char *boot_command)
831 {
832 /* Don't bother with any of this if the boot_command
833 * is empty.
834 */
835 if (boot_command && strlen(boot_command)) {
836 char full_boot_str[256];
837
838 strcpy(full_boot_str, "boot ");
839 strcpy(full_boot_str + strlen("boot "), boot_command);
840
841 ldom_set_var("reboot-command", full_boot_str);
842 }
843 sun4v_mach_sir();
844 }
845
846 void ldom_power_off(void)
847 {
848 sun4v_mach_exit(0);
849 }
850
851 static void ds_conn_reset(struct ds_info *dp)
852 {
853 printk(KERN_ERR "ds-%lu: ds_conn_reset() from %p\n",
854 dp->id, __builtin_return_address(0));
855 }
856
857 static int register_services(struct ds_info *dp)
858 {
859 struct ldc_channel *lp = dp->lp;
860 int i;
861
862 for (i = 0; i < dp->num_ds_states; i++) {
863 struct {
864 struct ds_reg_req req;
865 u8 id_buf[256];
866 } pbuf;
867 struct ds_cap_state *cp = &dp->ds_states[i];
868 int err, msg_len;
869 u64 new_count;
870
871 if (cp->state == CAP_STATE_REGISTERED)
872 continue;
873
874 new_count = sched_clock() & 0xffffffff;
875 cp->handle = ((u64) i << 32) | new_count;
876
877 msg_len = (sizeof(struct ds_reg_req) +
878 strlen(cp->service_id));
879
880 memset(&pbuf, 0, sizeof(pbuf));
881 pbuf.req.tag.type = DS_REG_REQ;
882 pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag));
883 pbuf.req.handle = cp->handle;
884 pbuf.req.major = 1;
885 pbuf.req.minor = 0;
886 strcpy(pbuf.req.svc_id, cp->service_id);
887
888 err = __ds_send(lp, &pbuf, msg_len);
889 if (err > 0)
890 cp->state = CAP_STATE_REG_SENT;
891 }
892 return 0;
893 }
894
895 static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt)
896 {
897
898 if (dp->hs_state == DS_HS_START) {
899 if (pkt->type != DS_INIT_ACK)
900 goto conn_reset;
901
902 dp->hs_state = DS_HS_DONE;
903
904 return register_services(dp);
905 }
906
907 if (dp->hs_state != DS_HS_DONE)
908 goto conn_reset;
909
910 if (pkt->type == DS_REG_ACK) {
911 struct ds_reg_ack *ap = (struct ds_reg_ack *) pkt;
912 struct ds_cap_state *cp = find_cap(dp, ap->handle);
913
914 if (!cp) {
915 printk(KERN_ERR "ds-%lu: REG ACK for unknown "
916 "handle %lx\n", dp->id, ap->handle);
917 return 0;
918 }
919 printk(KERN_INFO "ds-%lu: Registered %s service.\n",
920 dp->id, cp->service_id);
921 cp->state = CAP_STATE_REGISTERED;
922 } else if (pkt->type == DS_REG_NACK) {
923 struct ds_reg_nack *np = (struct ds_reg_nack *) pkt;
924 struct ds_cap_state *cp = find_cap(dp, np->handle);
925
926 if (!cp) {
927 printk(KERN_ERR "ds-%lu: REG NACK for "
928 "unknown handle %lx\n",
929 dp->id, np->handle);
930 return 0;
931 }
932 cp->state = CAP_STATE_UNKNOWN;
933 }
934
935 return 0;
936
937 conn_reset:
938 ds_conn_reset(dp);
939 return -ECONNRESET;
940 }
941
942 static void __send_ds_nack(struct ds_info *dp, u64 handle)
943 {
944 struct ds_data_nack nack = {
945 .tag = {
946 .type = DS_NACK,
947 .len = (sizeof(struct ds_data_nack) -
948 sizeof(struct ds_msg_tag)),
949 },
950 .handle = handle,
951 .result = DS_INV_HDL,
952 };
953
954 __ds_send(dp->lp, &nack, sizeof(nack));
955 }
956
957 static LIST_HEAD(ds_work_list);
958 static DECLARE_WAIT_QUEUE_HEAD(ds_wait);
959
960 struct ds_queue_entry {
961 struct list_head list;
962 struct ds_info *dp;
963 int req_len;
964 int __pad;
965 u64 req[0];
966 };
967
968 static void process_ds_work(void)
969 {
970 struct ds_queue_entry *qp, *tmp;
971 unsigned long flags;
972 LIST_HEAD(todo);
973
974 spin_lock_irqsave(&ds_lock, flags);
975 list_splice_init(&ds_work_list, &todo);
976 spin_unlock_irqrestore(&ds_lock, flags);
977
978 list_for_each_entry_safe(qp, tmp, &todo, list) {
979 struct ds_data *dpkt = (struct ds_data *) qp->req;
980 struct ds_info *dp = qp->dp;
981 struct ds_cap_state *cp = find_cap(dp, dpkt->handle);
982 int req_len = qp->req_len;
983
984 if (!cp) {
985 printk(KERN_ERR "ds-%lu: Data for unknown "
986 "handle %lu\n",
987 dp->id, dpkt->handle);
988
989 spin_lock_irqsave(&ds_lock, flags);
990 __send_ds_nack(dp, dpkt->handle);
991 spin_unlock_irqrestore(&ds_lock, flags);
992 } else {
993 cp->data(dp, cp, dpkt, req_len);
994 }
995
996 list_del(&qp->list);
997 kfree(qp);
998 }
999 }
1000
1001 static int ds_thread(void *__unused)
1002 {
1003 DEFINE_WAIT(wait);
1004
1005 while (1) {
1006 prepare_to_wait(&ds_wait, &wait, TASK_INTERRUPTIBLE);
1007 if (list_empty(&ds_work_list))
1008 schedule();
1009 finish_wait(&ds_wait, &wait);
1010
1011 if (kthread_should_stop())
1012 break;
1013
1014 process_ds_work();
1015 }
1016
1017 return 0;
1018 }
1019
1020 static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len)
1021 {
1022 struct ds_data *dpkt = (struct ds_data *) pkt;
1023 struct ds_queue_entry *qp;
1024
1025 qp = kmalloc(sizeof(struct ds_queue_entry) + len, GFP_ATOMIC);
1026 if (!qp) {
1027 __send_ds_nack(dp, dpkt->handle);
1028 } else {
1029 qp->dp = dp;
1030 memcpy(&qp->req, pkt, len);
1031 list_add_tail(&qp->list, &ds_work_list);
1032 wake_up(&ds_wait);
1033 }
1034 return 0;
1035 }
1036
1037 static void ds_up(struct ds_info *dp)
1038 {
1039 struct ldc_channel *lp = dp->lp;
1040 struct ds_ver_req req;
1041 int err;
1042
1043 req.tag.type = DS_INIT_REQ;
1044 req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag);
1045 req.ver.major = 1;
1046 req.ver.minor = 0;
1047
1048 err = __ds_send(lp, &req, sizeof(req));
1049 if (err > 0)
1050 dp->hs_state = DS_HS_START;
1051 }
1052
1053 static void ds_reset(struct ds_info *dp)
1054 {
1055 int i;
1056
1057 dp->hs_state = 0;
1058
1059 for (i = 0; i < dp->num_ds_states; i++) {
1060 struct ds_cap_state *cp = &dp->ds_states[i];
1061
1062 cp->state = CAP_STATE_UNKNOWN;
1063 }
1064 }
1065
1066 static void ds_event(void *arg, int event)
1067 {
1068 struct ds_info *dp = arg;
1069 struct ldc_channel *lp = dp->lp;
1070 unsigned long flags;
1071 int err;
1072
1073 spin_lock_irqsave(&ds_lock, flags);
1074
1075 if (event == LDC_EVENT_UP) {
1076 ds_up(dp);
1077 spin_unlock_irqrestore(&ds_lock, flags);
1078 return;
1079 }
1080
1081 if (event == LDC_EVENT_RESET) {
1082 ds_reset(dp);
1083 spin_unlock_irqrestore(&ds_lock, flags);
1084 return;
1085 }
1086
1087 if (event != LDC_EVENT_DATA_READY) {
1088 printk(KERN_WARNING "ds-%lu: Unexpected LDC event %d\n",
1089 dp->id, event);
1090 spin_unlock_irqrestore(&ds_lock, flags);
1091 return;
1092 }
1093
1094 err = 0;
1095 while (1) {
1096 struct ds_msg_tag *tag;
1097
1098 err = ldc_read(lp, dp->rcv_buf, sizeof(*tag));
1099
1100 if (unlikely(err < 0)) {
1101 if (err == -ECONNRESET)
1102 ds_conn_reset(dp);
1103 break;
1104 }
1105 if (err == 0)
1106 break;
1107
1108 tag = dp->rcv_buf;
1109 err = ldc_read(lp, tag + 1, tag->len);
1110
1111 if (unlikely(err < 0)) {
1112 if (err == -ECONNRESET)
1113 ds_conn_reset(dp);
1114 break;
1115 }
1116 if (err < tag->len)
1117 break;
1118
1119 if (tag->type < DS_DATA)
1120 err = ds_handshake(dp, dp->rcv_buf);
1121 else
1122 err = ds_data(dp, dp->rcv_buf,
1123 sizeof(*tag) + err);
1124 if (err == -ECONNRESET)
1125 break;
1126 }
1127
1128 spin_unlock_irqrestore(&ds_lock, flags);
1129 }
1130
1131 static int __devinit ds_probe(struct vio_dev *vdev,
1132 const struct vio_device_id *id)
1133 {
1134 static int ds_version_printed;
1135 struct ldc_channel_config ds_cfg = {
1136 .event = ds_event,
1137 .mtu = 4096,
1138 .mode = LDC_MODE_STREAM,
1139 };
1140 struct mdesc_handle *hp;
1141 struct ldc_channel *lp;
1142 struct ds_info *dp;
1143 const u64 *val;
1144 int err, i;
1145
1146 if (ds_version_printed++ == 0)
1147 printk(KERN_INFO "%s", version);
1148
1149 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1150 err = -ENOMEM;
1151 if (!dp)
1152 goto out_err;
1153
1154 hp = mdesc_grab();
1155 val = mdesc_get_property(hp, vdev->mp, "id", NULL);
1156 if (val)
1157 dp->id = *val;
1158 mdesc_release(hp);
1159
1160 dp->rcv_buf = kzalloc(4096, GFP_KERNEL);
1161 if (!dp->rcv_buf)
1162 goto out_free_dp;
1163
1164 dp->rcv_buf_len = 4096;
1165
1166 dp->ds_states = kzalloc(sizeof(ds_states_template),
1167 GFP_KERNEL);
1168 if (!dp->ds_states)
1169 goto out_free_rcv_buf;
1170
1171 memcpy(dp->ds_states, ds_states_template,
1172 sizeof(ds_states_template));
1173 dp->num_ds_states = ARRAY_SIZE(ds_states_template);
1174
1175 for (i = 0; i < dp->num_ds_states; i++)
1176 dp->ds_states[i].handle = ((u64)i << 32);
1177
1178 ds_cfg.tx_irq = vdev->tx_irq;
1179 ds_cfg.rx_irq = vdev->rx_irq;
1180
1181 lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp);
1182 if (IS_ERR(lp)) {
1183 err = PTR_ERR(lp);
1184 goto out_free_ds_states;
1185 }
1186 dp->lp = lp;
1187
1188 err = ldc_bind(lp, "DS");
1189 if (err)
1190 goto out_free_ldc;
1191
1192 spin_lock_irq(&ds_lock);
1193 dp->next = ds_info_list;
1194 ds_info_list = dp;
1195 spin_unlock_irq(&ds_lock);
1196
1197 return err;
1198
1199 out_free_ldc:
1200 ldc_free(dp->lp);
1201
1202 out_free_ds_states:
1203 kfree(dp->ds_states);
1204
1205 out_free_rcv_buf:
1206 kfree(dp->rcv_buf);
1207
1208 out_free_dp:
1209 kfree(dp);
1210
1211 out_err:
1212 return err;
1213 }
1214
1215 static int ds_remove(struct vio_dev *vdev)
1216 {
1217 return 0;
1218 }
1219
1220 static struct vio_device_id ds_match[] = {
1221 {
1222 .type = "domain-services-port",
1223 },
1224 {},
1225 };
1226
1227 static struct vio_driver ds_driver = {
1228 .id_table = ds_match,
1229 .probe = ds_probe,
1230 .remove = ds_remove,
1231 .driver = {
1232 .name = "ds",
1233 .owner = THIS_MODULE,
1234 }
1235 };
1236
1237 static int __init ds_init(void)
1238 {
1239 kthread_run(ds_thread, NULL, "kldomd");
1240
1241 return vio_register_driver(&ds_driver);
1242 }
1243
1244 subsys_initcall(ds_init);
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