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Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[wrt350n-kernel.git] / arch / sparc64 / kernel / ds.c
blob9552811653b8adc31a1efef6eeec9171681b3a95
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 <<<<<<< HEAD:arch/sparc64/kernel/ds.c
529 static int dr_cpu_configure(struct ds_info *dp,
530 struct ds_cap_state *cp,
531 u64 req_num,
532 cpumask_t *mask)
533 =======
534 static int __cpuinit dr_cpu_configure(struct ds_info *dp,
535 struct ds_cap_state *cp,
536 u64 req_num,
537 cpumask_t *mask)
538 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/sparc64/kernel/ds.c
539 {
540 struct ds_data *resp;
541 int resp_len, ncpus, cpu;
542 unsigned long flags;
543
544 ncpus = cpus_weight(*mask);
545 resp_len = dr_cpu_size_response(ncpus);
546 resp = kzalloc(resp_len, GFP_KERNEL);
547 if (!resp)
548 return -ENOMEM;
549
550 dr_cpu_init_response(resp, req_num, cp->handle,
551 resp_len, ncpus, mask,
552 DR_CPU_STAT_CONFIGURED);
553
554 mdesc_fill_in_cpu_data(*mask);
555
556 for_each_cpu_mask(cpu, *mask) {
557 int err;
558
559 printk(KERN_INFO "ds-%lu: Starting cpu %d...\n",
560 dp->id, cpu);
561 err = cpu_up(cpu);
562 if (err) {
563 __u32 res = DR_CPU_RES_FAILURE;
564 __u32 stat = DR_CPU_STAT_UNCONFIGURED;
565
566 if (!cpu_present(cpu)) {
567 /* CPU not present in MD */
568 res = DR_CPU_RES_NOT_IN_MD;
569 stat = DR_CPU_STAT_NOT_PRESENT;
570 } else if (err == -ENODEV) {
571 /* CPU did not call in successfully */
572 res = DR_CPU_RES_CPU_NOT_RESPONDING;
573 }
574
575 printk(KERN_INFO "ds-%lu: CPU startup failed err=%d\n",
576 dp->id, err);
577 dr_cpu_mark(resp, cpu, ncpus, res, stat);
578 }
579 }
580
581 spin_lock_irqsave(&ds_lock, flags);
582 __ds_send(dp->lp, resp, resp_len);
583 spin_unlock_irqrestore(&ds_lock, flags);
584
585 kfree(resp);
586
587 /* Redistribute IRQs, taking into account the new cpus. */
588 fixup_irqs();
589
590 return 0;
591 }
592
593 static int dr_cpu_unconfigure(struct ds_info *dp,
594 struct ds_cap_state *cp,
595 u64 req_num,
596 cpumask_t *mask)
597 {
598 struct ds_data *resp;
599 int resp_len, ncpus, cpu;
600 unsigned long flags;
601
602 ncpus = cpus_weight(*mask);
603 resp_len = dr_cpu_size_response(ncpus);
604 resp = kzalloc(resp_len, GFP_KERNEL);
605 if (!resp)
606 return -ENOMEM;
607
608 dr_cpu_init_response(resp, req_num, cp->handle,
609 resp_len, ncpus, mask,
610 DR_CPU_STAT_UNCONFIGURED);
611
612 for_each_cpu_mask(cpu, *mask) {
613 int err;
614
615 printk(KERN_INFO "ds-%lu: Shutting down cpu %d...\n",
616 dp->id, cpu);
617 err = cpu_down(cpu);
618 if (err)
619 dr_cpu_mark(resp, cpu, ncpus,
620 DR_CPU_RES_FAILURE,
621 DR_CPU_STAT_CONFIGURED);
622 }
623
624 spin_lock_irqsave(&ds_lock, flags);
625 __ds_send(dp->lp, resp, resp_len);
626 spin_unlock_irqrestore(&ds_lock, flags);
627
628 kfree(resp);
629
630 return 0;
631 }
632
633 <<<<<<< HEAD:arch/sparc64/kernel/ds.c
634 static void dr_cpu_data(struct ds_info *dp,
635 struct ds_cap_state *cp,
636 void *buf, int len)
637 =======
638 static void __cpuinit dr_cpu_data(struct ds_info *dp,
639 struct ds_cap_state *cp,
640 void *buf, int len)
641 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:arch/sparc64/kernel/ds.c
642 {
643 struct ds_data *data = buf;
644 struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
645 u32 *cpu_list = (u32 *) (tag + 1);
646 u64 req_num = tag->req_num;
647 cpumask_t mask;
648 unsigned int i;
649 int err;
650
651 switch (tag->type) {
652 case DR_CPU_CONFIGURE:
653 case DR_CPU_UNCONFIGURE:
654 case DR_CPU_FORCE_UNCONFIGURE:
655 break;
656
657 default:
658 dr_cpu_send_error(dp, cp, data);
659 return;
660 }
661
662 purge_dups(cpu_list, tag->num_records);
663
664 cpus_clear(mask);
665 for (i = 0; i < tag->num_records; i++) {
666 if (cpu_list[i] == CPU_SENTINEL)
667 continue;
668
669 if (cpu_list[i] < NR_CPUS)
670 cpu_set(cpu_list[i], mask);
671 }
672
673 if (tag->type == DR_CPU_CONFIGURE)
674 err = dr_cpu_configure(dp, cp, req_num, &mask);
675 else
676 err = dr_cpu_unconfigure(dp, cp, req_num, &mask);
677
678 if (err)
679 dr_cpu_send_error(dp, cp, data);
680 }
681 #endif /* CONFIG_HOTPLUG_CPU */
682
683 struct ds_pri_msg {
684 __u64 req_num;
685 __u64 type;
686 #define DS_PRI_REQUEST 0x00
687 #define DS_PRI_DATA 0x01
688 #define DS_PRI_UPDATE 0x02
689 };
690
691 static void ds_pri_data(struct ds_info *dp,
692 struct ds_cap_state *cp,
693 void *buf, int len)
694 {
695 struct ds_data *dpkt = buf;
696 struct ds_pri_msg *rp;
697
698 rp = (struct ds_pri_msg *) (dpkt + 1);
699
700 printk(KERN_INFO "ds-%lu: PRI REQ [%lx:%lx], len=%d\n",
701 dp->id, rp->req_num, rp->type, len);
702 }
703
704 struct ds_var_hdr {
705 __u32 type;
706 #define DS_VAR_SET_REQ 0x00
707 #define DS_VAR_DELETE_REQ 0x01
708 #define DS_VAR_SET_RESP 0x02
709 #define DS_VAR_DELETE_RESP 0x03
710 };
711
712 struct ds_var_set_msg {
713 struct ds_var_hdr hdr;
714 char name_and_value[0];
715 };
716
717 struct ds_var_delete_msg {
718 struct ds_var_hdr hdr;
719 char name[0];
720 };
721
722 struct ds_var_resp {
723 struct ds_var_hdr hdr;
724 __u32 result;
725 #define DS_VAR_SUCCESS 0x00
726 #define DS_VAR_NO_SPACE 0x01
727 #define DS_VAR_INVALID_VAR 0x02
728 #define DS_VAR_INVALID_VAL 0x03
729 #define DS_VAR_NOT_PRESENT 0x04
730 };
731
732 static DEFINE_MUTEX(ds_var_mutex);
733 static int ds_var_doorbell;
734 static int ds_var_response;
735
736 static void ds_var_data(struct ds_info *dp,
737 struct ds_cap_state *cp,
738 void *buf, int len)
739 {
740 struct ds_data *dpkt = buf;
741 struct ds_var_resp *rp;
742
743 rp = (struct ds_var_resp *) (dpkt + 1);
744
745 if (rp->hdr.type != DS_VAR_SET_RESP &&
746 rp->hdr.type != DS_VAR_DELETE_RESP)
747 return;
748
749 ds_var_response = rp->result;
750 wmb();
751 ds_var_doorbell = 1;
752 }
753
754 void ldom_set_var(const char *var, const char *value)
755 {
756 struct ds_cap_state *cp;
757 struct ds_info *dp;
758 unsigned long flags;
759
760 spin_lock_irqsave(&ds_lock, flags);
761 cp = NULL;
762 for (dp = ds_info_list; dp; dp = dp->next) {
763 struct ds_cap_state *tmp;
764
765 tmp = find_cap_by_string(dp, "var-config");
766 if (tmp && tmp->state == CAP_STATE_REGISTERED) {
767 cp = tmp;
768 break;
769 }
770 }
771 if (!cp) {
772 for (dp = ds_info_list; dp; dp = dp->next) {
773 struct ds_cap_state *tmp;
774
775 tmp = find_cap_by_string(dp, "var-config-backup");
776 if (tmp && tmp->state == CAP_STATE_REGISTERED) {
777 cp = tmp;
778 break;
779 }
780 }
781 }
782 spin_unlock_irqrestore(&ds_lock, flags);
783
784 if (cp) {
785 union {
786 struct {
787 struct ds_data data;
788 struct ds_var_set_msg msg;
789 } header;
790 char all[512];
791 } pkt;
792 char *base, *p;
793 int msg_len, loops;
794
795 memset(&pkt, 0, sizeof(pkt));
796 pkt.header.data.tag.type = DS_DATA;
797 pkt.header.data.handle = cp->handle;
798 pkt.header.msg.hdr.type = DS_VAR_SET_REQ;
799 base = p = &pkt.header.msg.name_and_value[0];
800 strcpy(p, var);
801 p += strlen(var) + 1;
802 strcpy(p, value);
803 p += strlen(value) + 1;
804
805 msg_len = (sizeof(struct ds_data) +
806 sizeof(struct ds_var_set_msg) +
807 (p - base));
808 msg_len = (msg_len + 3) & ~3;
809 pkt.header.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
810
811 mutex_lock(&ds_var_mutex);
812
813 spin_lock_irqsave(&ds_lock, flags);
814 ds_var_doorbell = 0;
815 ds_var_response = -1;
816
817 __ds_send(dp->lp, &pkt, msg_len);
818 spin_unlock_irqrestore(&ds_lock, flags);
819
820 loops = 1000;
821 while (ds_var_doorbell == 0) {
822 if (loops-- < 0)
823 break;
824 barrier();
825 udelay(100);
826 }
827
828 mutex_unlock(&ds_var_mutex);
829
830 if (ds_var_doorbell == 0 ||
831 ds_var_response != DS_VAR_SUCCESS)
832 printk(KERN_ERR "ds-%lu: var-config [%s:%s] "
833 "failed, response(%d).\n",
834 dp->id, var, value,
835 ds_var_response);
836 } else {
837 printk(KERN_ERR PFX "var-config not registered so "
838 "could not set (%s) variable to (%s).\n",
839 var, value);
840 }
841 }
842
843 void ldom_reboot(const char *boot_command)
844 {
845 /* Don't bother with any of this if the boot_command
846 * is empty.
847 */
848 if (boot_command && strlen(boot_command)) {
849 char full_boot_str[256];
850
851 strcpy(full_boot_str, "boot ");
852 strcpy(full_boot_str + strlen("boot "), boot_command);
853
854 ldom_set_var("reboot-command", full_boot_str);
855 }
856 sun4v_mach_sir();
857 }
858
859 void ldom_power_off(void)
860 {
861 sun4v_mach_exit(0);
862 }
863
864 static void ds_conn_reset(struct ds_info *dp)
865 {
866 printk(KERN_ERR "ds-%lu: ds_conn_reset() from %p\n",
867 dp->id, __builtin_return_address(0));
868 }
869
870 static int register_services(struct ds_info *dp)
871 {
872 struct ldc_channel *lp = dp->lp;
873 int i;
874
875 for (i = 0; i < dp->num_ds_states; i++) {
876 struct {
877 struct ds_reg_req req;
878 u8 id_buf[256];
879 } pbuf;
880 struct ds_cap_state *cp = &dp->ds_states[i];
881 int err, msg_len;
882 u64 new_count;
883
884 if (cp->state == CAP_STATE_REGISTERED)
885 continue;
886
887 new_count = sched_clock() & 0xffffffff;
888 cp->handle = ((u64) i << 32) | new_count;
889
890 msg_len = (sizeof(struct ds_reg_req) +
891 strlen(cp->service_id));
892
893 memset(&pbuf, 0, sizeof(pbuf));
894 pbuf.req.tag.type = DS_REG_REQ;
895 pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag));
896 pbuf.req.handle = cp->handle;
897 pbuf.req.major = 1;
898 pbuf.req.minor = 0;
899 strcpy(pbuf.req.svc_id, cp->service_id);
900
901 err = __ds_send(lp, &pbuf, msg_len);
902 if (err > 0)
903 cp->state = CAP_STATE_REG_SENT;
904 }
905 return 0;
906 }
907
908 static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt)
909 {
910
911 if (dp->hs_state == DS_HS_START) {
912 if (pkt->type != DS_INIT_ACK)
913 goto conn_reset;
914
915 dp->hs_state = DS_HS_DONE;
916
917 return register_services(dp);
918 }
919
920 if (dp->hs_state != DS_HS_DONE)
921 goto conn_reset;
922
923 if (pkt->type == DS_REG_ACK) {
924 struct ds_reg_ack *ap = (struct ds_reg_ack *) pkt;
925 struct ds_cap_state *cp = find_cap(dp, ap->handle);
926
927 if (!cp) {
928 printk(KERN_ERR "ds-%lu: REG ACK for unknown "
929 "handle %lx\n", dp->id, ap->handle);
930 return 0;
931 }
932 printk(KERN_INFO "ds-%lu: Registered %s service.\n",
933 dp->id, cp->service_id);
934 cp->state = CAP_STATE_REGISTERED;
935 } else if (pkt->type == DS_REG_NACK) {
936 struct ds_reg_nack *np = (struct ds_reg_nack *) pkt;
937 struct ds_cap_state *cp = find_cap(dp, np->handle);
938
939 if (!cp) {
940 printk(KERN_ERR "ds-%lu: REG NACK for "
941 "unknown handle %lx\n",
942 dp->id, np->handle);
943 return 0;
944 }
945 cp->state = CAP_STATE_UNKNOWN;
946 }
947
948 return 0;
949
950 conn_reset:
951 ds_conn_reset(dp);
952 return -ECONNRESET;
953 }
954
955 static void __send_ds_nack(struct ds_info *dp, u64 handle)
956 {
957 struct ds_data_nack nack = {
958 .tag = {
959 .type = DS_NACK,
960 .len = (sizeof(struct ds_data_nack) -
961 sizeof(struct ds_msg_tag)),
962 },
963 .handle = handle,
964 .result = DS_INV_HDL,
965 };
966
967 __ds_send(dp->lp, &nack, sizeof(nack));
968 }
969
970 static LIST_HEAD(ds_work_list);
971 static DECLARE_WAIT_QUEUE_HEAD(ds_wait);
972
973 struct ds_queue_entry {
974 struct list_head list;
975 struct ds_info *dp;
976 int req_len;
977 int __pad;
978 u64 req[0];
979 };
980
981 static void process_ds_work(void)
982 {
983 struct ds_queue_entry *qp, *tmp;
984 unsigned long flags;
985 LIST_HEAD(todo);
986
987 spin_lock_irqsave(&ds_lock, flags);
988 list_splice(&ds_work_list, &todo);
989 INIT_LIST_HEAD(&ds_work_list);
990 spin_unlock_irqrestore(&ds_lock, flags);
991
992 list_for_each_entry_safe(qp, tmp, &todo, list) {
993 struct ds_data *dpkt = (struct ds_data *) qp->req;
994 struct ds_info *dp = qp->dp;
995 struct ds_cap_state *cp = find_cap(dp, dpkt->handle);
996 int req_len = qp->req_len;
997
998 if (!cp) {
999 printk(KERN_ERR "ds-%lu: Data for unknown "
1000 "handle %lu\n",
1001 dp->id, dpkt->handle);
1002
1003 spin_lock_irqsave(&ds_lock, flags);
1004 __send_ds_nack(dp, dpkt->handle);
1005 spin_unlock_irqrestore(&ds_lock, flags);
1006 } else {
1007 cp->data(dp, cp, dpkt, req_len);
1008 }
1009
1010 list_del(&qp->list);
1011 kfree(qp);
1012 }
1013 }
1014
1015 static int ds_thread(void *__unused)
1016 {
1017 DEFINE_WAIT(wait);
1018
1019 while (1) {
1020 prepare_to_wait(&ds_wait, &wait, TASK_INTERRUPTIBLE);
1021 if (list_empty(&ds_work_list))
1022 schedule();
1023 finish_wait(&ds_wait, &wait);
1024
1025 if (kthread_should_stop())
1026 break;
1027
1028 process_ds_work();
1029 }
1030
1031 return 0;
1032 }
1033
1034 static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len)
1035 {
1036 struct ds_data *dpkt = (struct ds_data *) pkt;
1037 struct ds_queue_entry *qp;
1038
1039 qp = kmalloc(sizeof(struct ds_queue_entry) + len, GFP_ATOMIC);
1040 if (!qp) {
1041 __send_ds_nack(dp, dpkt->handle);
1042 } else {
1043 qp->dp = dp;
1044 memcpy(&qp->req, pkt, len);
1045 list_add_tail(&qp->list, &ds_work_list);
1046 wake_up(&ds_wait);
1047 }
1048 return 0;
1049 }
1050
1051 static void ds_up(struct ds_info *dp)
1052 {
1053 struct ldc_channel *lp = dp->lp;
1054 struct ds_ver_req req;
1055 int err;
1056
1057 req.tag.type = DS_INIT_REQ;
1058 req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag);
1059 req.ver.major = 1;
1060 req.ver.minor = 0;
1061
1062 err = __ds_send(lp, &req, sizeof(req));
1063 if (err > 0)
1064 dp->hs_state = DS_HS_START;
1065 }
1066
1067 static void ds_reset(struct ds_info *dp)
1068 {
1069 int i;
1070
1071 dp->hs_state = 0;
1072
1073 for (i = 0; i < dp->num_ds_states; i++) {
1074 struct ds_cap_state *cp = &dp->ds_states[i];
1075
1076 cp->state = CAP_STATE_UNKNOWN;
1077 }
1078 }
1079
1080 static void ds_event(void *arg, int event)
1081 {
1082 struct ds_info *dp = arg;
1083 struct ldc_channel *lp = dp->lp;
1084 unsigned long flags;
1085 int err;
1086
1087 spin_lock_irqsave(&ds_lock, flags);
1088
1089 if (event == LDC_EVENT_UP) {
1090 ds_up(dp);
1091 spin_unlock_irqrestore(&ds_lock, flags);
1092 return;
1093 }
1094
1095 if (event == LDC_EVENT_RESET) {
1096 ds_reset(dp);
1097 spin_unlock_irqrestore(&ds_lock, flags);
1098 return;
1099 }
1100
1101 if (event != LDC_EVENT_DATA_READY) {
1102 printk(KERN_WARNING "ds-%lu: Unexpected LDC event %d\n",
1103 dp->id, event);
1104 spin_unlock_irqrestore(&ds_lock, flags);
1105 return;
1106 }
1107
1108 err = 0;
1109 while (1) {
1110 struct ds_msg_tag *tag;
1111
1112 err = ldc_read(lp, dp->rcv_buf, sizeof(*tag));
1113
1114 if (unlikely(err < 0)) {
1115 if (err == -ECONNRESET)
1116 ds_conn_reset(dp);
1117 break;
1118 }
1119 if (err == 0)
1120 break;
1121
1122 tag = dp->rcv_buf;
1123 err = ldc_read(lp, tag + 1, tag->len);
1124
1125 if (unlikely(err < 0)) {
1126 if (err == -ECONNRESET)
1127 ds_conn_reset(dp);
1128 break;
1129 }
1130 if (err < tag->len)
1131 break;
1132
1133 if (tag->type < DS_DATA)
1134 err = ds_handshake(dp, dp->rcv_buf);
1135 else
1136 err = ds_data(dp, dp->rcv_buf,
1137 sizeof(*tag) + err);
1138 if (err == -ECONNRESET)
1139 break;
1140 }
1141
1142 spin_unlock_irqrestore(&ds_lock, flags);
1143 }
1144
1145 static int __devinit ds_probe(struct vio_dev *vdev,
1146 const struct vio_device_id *id)
1147 {
1148 static int ds_version_printed;
1149 struct ldc_channel_config ds_cfg = {
1150 .event = ds_event,
1151 .mtu = 4096,
1152 .mode = LDC_MODE_STREAM,
1153 };
1154 struct mdesc_handle *hp;
1155 struct ldc_channel *lp;
1156 struct ds_info *dp;
1157 const u64 *val;
1158 int err, i;
1159
1160 if (ds_version_printed++ == 0)
1161 printk(KERN_INFO "%s", version);
1162
1163 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1164 err = -ENOMEM;
1165 if (!dp)
1166 goto out_err;
1167
1168 hp = mdesc_grab();
1169 val = mdesc_get_property(hp, vdev->mp, "id", NULL);
1170 if (val)
1171 dp->id = *val;
1172 mdesc_release(hp);
1173
1174 dp->rcv_buf = kzalloc(4096, GFP_KERNEL);
1175 if (!dp->rcv_buf)
1176 goto out_free_dp;
1177
1178 dp->rcv_buf_len = 4096;
1179
1180 dp->ds_states = kzalloc(sizeof(ds_states_template),
1181 GFP_KERNEL);
1182 if (!dp->ds_states)
1183 goto out_free_rcv_buf;
1184
1185 memcpy(dp->ds_states, ds_states_template,
1186 sizeof(ds_states_template));
1187 dp->num_ds_states = ARRAY_SIZE(ds_states_template);
1188
1189 for (i = 0; i < dp->num_ds_states; i++)
1190 dp->ds_states[i].handle = ((u64)i << 32);
1191
1192 ds_cfg.tx_irq = vdev->tx_irq;
1193 ds_cfg.rx_irq = vdev->rx_irq;
1194
1195 lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp);
1196 if (IS_ERR(lp)) {
1197 err = PTR_ERR(lp);
1198 goto out_free_ds_states;
1199 }
1200 dp->lp = lp;
1201
1202 err = ldc_bind(lp, "DS");
1203 if (err)
1204 goto out_free_ldc;
1205
1206 spin_lock_irq(&ds_lock);
1207 dp->next = ds_info_list;
1208 ds_info_list = dp;
1209 spin_unlock_irq(&ds_lock);
1210
1211 return err;
1212
1213 out_free_ldc:
1214 ldc_free(dp->lp);
1215
1216 out_free_ds_states:
1217 kfree(dp->ds_states);
1218
1219 out_free_rcv_buf:
1220 kfree(dp->rcv_buf);
1221
1222 out_free_dp:
1223 kfree(dp);
1224
1225 out_err:
1226 return err;
1227 }
1228
1229 static int ds_remove(struct vio_dev *vdev)
1230 {
1231 return 0;
1232 }
1233
1234 static struct vio_device_id ds_match[] = {
1235 {
1236 .type = "domain-services-port",
1237 },
1238 {},
1239 };
1240
1241 static struct vio_driver ds_driver = {
1242 .id_table = ds_match,
1243 .probe = ds_probe,
1244 .remove = ds_remove,
1245 .driver = {
1246 .name = "ds",
1247 .owner = THIS_MODULE,
1248 }
1249 };
1250
1251 static int __init ds_init(void)
1252 {
1253 kthread_run(ds_thread, NULL, "kldomd");
1254
1255 return vio_register_driver(&ds_driver);
1256 }
1257
1258 subsys_initcall(ds_init);
WRT350N Kernel Patches