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sched: cleanup, make struct rq comments more consistent
[linux-2.6/mini2440.git] / arch / sparc64 / kernel / ds.c
blob9f472a79d37e04236add3ad9138bc0de33695bd9
1 /* ds.c: Domain Services driver for Logical Domains
2 *
3 * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
4 */
5
6 #include <linux/kernel.h>
7 #include <linux/module.h>
8 #include <linux/types.h>
9 #include <linux/module.h>
10 #include <linux/string.h>
11 #include <linux/slab.h>
12 #include <linux/sched.h>
13 #include <linux/delay.h>
14 #include <linux/mutex.h>
15 #include <linux/kthread.h>
16 #include <linux/reboot.h>
17 #include <linux/cpu.h>
18
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 #define DRV_MODULE_NAME "ds"
26 #define PFX DRV_MODULE_NAME ": "
27 #define DRV_MODULE_VERSION "1.0"
28 #define DRV_MODULE_RELDATE "Jul 11, 2007"
29
30 static char version[] __devinitdata =
31 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
32 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
33 MODULE_DESCRIPTION("Sun LDOM domain services driver");
34 MODULE_LICENSE("GPL");
35 MODULE_VERSION(DRV_MODULE_VERSION);
36
37 struct ds_msg_tag {
38 __u32 type;
39 #define DS_INIT_REQ 0x00
40 #define DS_INIT_ACK 0x01
41 #define DS_INIT_NACK 0x02
42 #define DS_REG_REQ 0x03
43 #define DS_REG_ACK 0x04
44 #define DS_REG_NACK 0x05
45 #define DS_UNREG_REQ 0x06
46 #define DS_UNREG_ACK 0x07
47 #define DS_UNREG_NACK 0x08
48 #define DS_DATA 0x09
49 #define DS_NACK 0x0a
50
51 __u32 len;
52 };
53
54 /* Result codes */
55 #define DS_OK 0x00
56 #define DS_REG_VER_NACK 0x01
57 #define DS_REG_DUP 0x02
58 #define DS_INV_HDL 0x03
59 #define DS_TYPE_UNKNOWN 0x04
60
61 struct ds_version {
62 __u16 major;
63 __u16 minor;
64 };
65
66 struct ds_ver_req {
67 struct ds_msg_tag tag;
68 struct ds_version ver;
69 };
70
71 struct ds_ver_ack {
72 struct ds_msg_tag tag;
73 __u16 minor;
74 };
75
76 struct ds_ver_nack {
77 struct ds_msg_tag tag;
78 __u16 major;
79 };
80
81 struct ds_reg_req {
82 struct ds_msg_tag tag;
83 __u64 handle;
84 __u16 major;
85 __u16 minor;
86 char svc_id[0];
87 };
88
89 struct ds_reg_ack {
90 struct ds_msg_tag tag;
91 __u64 handle;
92 __u16 minor;
93 };
94
95 struct ds_reg_nack {
96 struct ds_msg_tag tag;
97 __u64 handle;
98 __u16 major;
99 };
100
101 struct ds_unreg_req {
102 struct ds_msg_tag tag;
103 __u64 handle;
104 };
105
106 struct ds_unreg_ack {
107 struct ds_msg_tag tag;
108 __u64 handle;
109 };
110
111 struct ds_unreg_nack {
112 struct ds_msg_tag tag;
113 __u64 handle;
114 };
115
116 struct ds_data {
117 struct ds_msg_tag tag;
118 __u64 handle;
119 };
120
121 struct ds_data_nack {
122 struct ds_msg_tag tag;
123 __u64 handle;
124 __u64 result;
125 };
126
127 struct ds_info;
128 struct ds_cap_state {
129 __u64 handle;
130
131 void (*data)(struct ds_info *dp,
132 struct ds_cap_state *cp,
133 void *buf, int len);
134
135 const char *service_id;
136
137 u8 state;
138 #define CAP_STATE_UNKNOWN 0x00
139 #define CAP_STATE_REG_SENT 0x01
140 #define CAP_STATE_REGISTERED 0x02
141 };
142
143 static void md_update_data(struct ds_info *dp, struct ds_cap_state *cp,
144 void *buf, int len);
145 static void domain_shutdown_data(struct ds_info *dp,
146 struct ds_cap_state *cp,
147 void *buf, int len);
148 static void domain_panic_data(struct ds_info *dp,
149 struct ds_cap_state *cp,
150 void *buf, int len);
151 #ifdef CONFIG_HOTPLUG_CPU
152 static void dr_cpu_data(struct ds_info *dp,
153 struct ds_cap_state *cp,
154 void *buf, int len);
155 #endif
156 static void ds_pri_data(struct ds_info *dp,
157 struct ds_cap_state *cp,
158 void *buf, int len);
159 static void ds_var_data(struct ds_info *dp,
160 struct ds_cap_state *cp,
161 void *buf, int len);
162
163 struct ds_cap_state ds_states_template[] = {
164 {
165 .service_id = "md-update",
166 .data = md_update_data,
167 },
168 {
169 .service_id = "domain-shutdown",
170 .data = domain_shutdown_data,
171 },
172 {
173 .service_id = "domain-panic",
174 .data = domain_panic_data,
175 },
176 #ifdef CONFIG_HOTPLUG_CPU
177 {
178 .service_id = "dr-cpu",
179 .data = dr_cpu_data,
180 },
181 #endif
182 {
183 .service_id = "pri",
184 .data = ds_pri_data,
185 },
186 {
187 .service_id = "var-config",
188 .data = ds_var_data,
189 },
190 {
191 .service_id = "var-config-backup",
192 .data = ds_var_data,
193 },
194 };
195
196 static DEFINE_SPINLOCK(ds_lock);
197
198 struct ds_info {
199 struct ldc_channel *lp;
200 u8 hs_state;
201 #define DS_HS_START 0x01
202 #define DS_HS_DONE 0x02
203
204 u64 id;
205
206 void *rcv_buf;
207 int rcv_buf_len;
208
209 struct ds_cap_state *ds_states;
210 int num_ds_states;
211
212 struct ds_info *next;
213 };
214
215 static struct ds_info *ds_info_list;
216
217 static struct ds_cap_state *find_cap(struct ds_info *dp, u64 handle)
218 {
219 unsigned int index = handle >> 32;
220
221 if (index >= dp->num_ds_states)
222 return NULL;
223 return &dp->ds_states[index];
224 }
225
226 static struct ds_cap_state *find_cap_by_string(struct ds_info *dp,
227 const char *name)
228 {
229 int i;
230
231 for (i = 0; i < dp->num_ds_states; i++) {
232 if (strcmp(dp->ds_states[i].service_id, name))
233 continue;
234
235 return &dp->ds_states[i];
236 }
237 return NULL;
238 }
239
240 static int __ds_send(struct ldc_channel *lp, void *data, int len)
241 {
242 int err, limit = 1000;
243
244 err = -EINVAL;
245 while (limit-- > 0) {
246 err = ldc_write(lp, data, len);
247 if (!err || (err != -EAGAIN))
248 break;
249 udelay(1);
250 }
251
252 return err;
253 }
254
255 static int ds_send(struct ldc_channel *lp, void *data, int len)
256 {
257 unsigned long flags;
258 int err;
259
260 spin_lock_irqsave(&ds_lock, flags);
261 err = __ds_send(lp, data, len);
262 spin_unlock_irqrestore(&ds_lock, flags);
263
264 return err;
265 }
266
267 struct ds_md_update_req {
268 __u64 req_num;
269 };
270
271 struct ds_md_update_res {
272 __u64 req_num;
273 __u32 result;
274 };
275
276 static void md_update_data(struct ds_info *dp,
277 struct ds_cap_state *cp,
278 void *buf, int len)
279 {
280 struct ldc_channel *lp = dp->lp;
281 struct ds_data *dpkt = buf;
282 struct ds_md_update_req *rp;
283 struct {
284 struct ds_data data;
285 struct ds_md_update_res res;
286 } pkt;
287
288 rp = (struct ds_md_update_req *) (dpkt + 1);
289
290 printk(KERN_INFO "ds-%lu: Machine description update.\n", dp->id);
291
292 mdesc_update();
293
294 memset(&pkt, 0, sizeof(pkt));
295 pkt.data.tag.type = DS_DATA;
296 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
297 pkt.data.handle = cp->handle;
298 pkt.res.req_num = rp->req_num;
299 pkt.res.result = DS_OK;
300
301 ds_send(lp, &pkt, sizeof(pkt));
302 }
303
304 struct ds_shutdown_req {
305 __u64 req_num;
306 __u32 ms_delay;
307 };
308
309 struct ds_shutdown_res {
310 __u64 req_num;
311 __u32 result;
312 char reason[1];
313 };
314
315 static void domain_shutdown_data(struct ds_info *dp,
316 struct ds_cap_state *cp,
317 void *buf, int len)
318 {
319 struct ldc_channel *lp = dp->lp;
320 struct ds_data *dpkt = buf;
321 struct ds_shutdown_req *rp;
322 struct {
323 struct ds_data data;
324 struct ds_shutdown_res res;
325 } pkt;
326
327 rp = (struct ds_shutdown_req *) (dpkt + 1);
328
329 printk(KERN_ALERT "ds-%lu: Shutdown request from "
330 "LDOM manager received.\n", dp->id);
331
332 memset(&pkt, 0, sizeof(pkt));
333 pkt.data.tag.type = DS_DATA;
334 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
335 pkt.data.handle = cp->handle;
336 pkt.res.req_num = rp->req_num;
337 pkt.res.result = DS_OK;
338 pkt.res.reason[0] = 0;
339
340 ds_send(lp, &pkt, sizeof(pkt));
341
342 orderly_poweroff(true);
343 }
344
345 struct ds_panic_req {
346 __u64 req_num;
347 };
348
349 struct ds_panic_res {
350 __u64 req_num;
351 __u32 result;
352 char reason[1];
353 };
354
355 static void domain_panic_data(struct ds_info *dp,
356 struct ds_cap_state *cp,
357 void *buf, int len)
358 {
359 struct ldc_channel *lp = dp->lp;
360 struct ds_data *dpkt = buf;
361 struct ds_panic_req *rp;
362 struct {
363 struct ds_data data;
364 struct ds_panic_res res;
365 } pkt;
366
367 rp = (struct ds_panic_req *) (dpkt + 1);
368
369 printk(KERN_ALERT "ds-%lu: Panic request from "
370 "LDOM manager received.\n", dp->id);
371
372 memset(&pkt, 0, sizeof(pkt));
373 pkt.data.tag.type = DS_DATA;
374 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
375 pkt.data.handle = cp->handle;
376 pkt.res.req_num = rp->req_num;
377 pkt.res.result = DS_OK;
378 pkt.res.reason[0] = 0;
379
380 ds_send(lp, &pkt, sizeof(pkt));
381
382 panic("PANIC requested by LDOM manager.");
383 }
384
385 #ifdef CONFIG_HOTPLUG_CPU
386 struct dr_cpu_tag {
387 __u64 req_num;
388 __u32 type;
389 #define DR_CPU_CONFIGURE 0x43
390 #define DR_CPU_UNCONFIGURE 0x55
391 #define DR_CPU_FORCE_UNCONFIGURE 0x46
392 #define DR_CPU_STATUS 0x53
393
394 /* Responses */
395 #define DR_CPU_OK 0x6f
396 #define DR_CPU_ERROR 0x65
397
398 __u32 num_records;
399 };
400
401 struct dr_cpu_resp_entry {
402 __u32 cpu;
403 __u32 result;
404 #define DR_CPU_RES_OK 0x00
405 #define DR_CPU_RES_FAILURE 0x01
406 #define DR_CPU_RES_BLOCKED 0x02
407 #define DR_CPU_RES_CPU_NOT_RESPONDING 0x03
408 #define DR_CPU_RES_NOT_IN_MD 0x04
409
410 __u32 stat;
411 #define DR_CPU_STAT_NOT_PRESENT 0x00
412 #define DR_CPU_STAT_UNCONFIGURED 0x01
413 #define DR_CPU_STAT_CONFIGURED 0x02
414
415 __u32 str_off;
416 };
417
418 static void __dr_cpu_send_error(struct ds_info *dp,
419 struct ds_cap_state *cp,
420 struct ds_data *data)
421 {
422 struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
423 struct {
424 struct ds_data data;
425 struct dr_cpu_tag tag;
426 } pkt;
427 int msg_len;
428
429 memset(&pkt, 0, sizeof(pkt));
430 pkt.data.tag.type = DS_DATA;
431 pkt.data.handle = cp->handle;
432 pkt.tag.req_num = tag->req_num;
433 pkt.tag.type = DR_CPU_ERROR;
434 pkt.tag.num_records = 0;
435
436 msg_len = (sizeof(struct ds_data) +
437 sizeof(struct dr_cpu_tag));
438
439 pkt.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
440
441 __ds_send(dp->lp, &pkt, msg_len);
442 }
443
444 static void dr_cpu_send_error(struct ds_info *dp,
445 struct ds_cap_state *cp,
446 struct ds_data *data)
447 {
448 unsigned long flags;
449
450 spin_lock_irqsave(&ds_lock, flags);
451 __dr_cpu_send_error(dp, cp, data);
452 spin_unlock_irqrestore(&ds_lock, flags);
453 }
454
455 #define CPU_SENTINEL 0xffffffff
456
457 static void purge_dups(u32 *list, u32 num_ents)
458 {
459 unsigned int i;
460
461 for (i = 0; i < num_ents; i++) {
462 u32 cpu = list[i];
463 unsigned int j;
464
465 if (cpu == CPU_SENTINEL)
466 continue;
467
468 for (j = i + 1; j < num_ents; j++) {
469 if (list[j] == cpu)
470 list[j] = CPU_SENTINEL;
471 }
472 }
473 }
474
475 static int dr_cpu_size_response(int ncpus)
476 {
477 return (sizeof(struct ds_data) +
478 sizeof(struct dr_cpu_tag) +
479 (sizeof(struct dr_cpu_resp_entry) * ncpus));
480 }
481
482 static void dr_cpu_init_response(struct ds_data *resp, u64 req_num,
483 u64 handle, int resp_len, int ncpus,
484 cpumask_t *mask, u32 default_stat)
485 {
486 struct dr_cpu_resp_entry *ent;
487 struct dr_cpu_tag *tag;
488 int i, cpu;
489
490 tag = (struct dr_cpu_tag *) (resp + 1);
491 ent = (struct dr_cpu_resp_entry *) (tag + 1);
492
493 resp->tag.type = DS_DATA;
494 resp->tag.len = resp_len - sizeof(struct ds_msg_tag);
495 resp->handle = handle;
496 tag->req_num = req_num;
497 tag->type = DR_CPU_OK;
498 tag->num_records = ncpus;
499
500 i = 0;
501 for_each_cpu_mask(cpu, *mask) {
502 ent[i].cpu = cpu;
503 ent[i].result = DR_CPU_RES_OK;
504 ent[i].stat = default_stat;
505 i++;
506 }
507 BUG_ON(i != ncpus);
508 }
509
510 static void dr_cpu_mark(struct ds_data *resp, int cpu, int ncpus,
511 u32 res, u32 stat)
512 {
513 struct dr_cpu_resp_entry *ent;
514 struct dr_cpu_tag *tag;
515 int i;
516
517 tag = (struct dr_cpu_tag *) (resp + 1);
518 ent = (struct dr_cpu_resp_entry *) (tag + 1);
519
520 for (i = 0; i < ncpus; i++) {
521 if (ent[i].cpu != cpu)
522 continue;
523 ent[i].result = res;
524 ent[i].stat = stat;
525 break;
526 }
527 }
528
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 struct ds_data *resp;
535 int resp_len, ncpus, cpu;
536 unsigned long flags;
537
538 ncpus = cpus_weight(*mask);
539 resp_len = dr_cpu_size_response(ncpus);
540 resp = kzalloc(resp_len, GFP_KERNEL);
541 if (!resp)
542 return -ENOMEM;
543
544 dr_cpu_init_response(resp, req_num, cp->handle,
545 resp_len, ncpus, mask,
546 DR_CPU_STAT_CONFIGURED);
547
548 mdesc_fill_in_cpu_data(*mask);
549
550 for_each_cpu_mask(cpu, *mask) {
551 int err;
552
553 printk(KERN_INFO "ds-%lu: 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-%lu: 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-%lu: 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 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_CPUS)
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-%lu: PRI REQ [%lx:%lx], 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-%lu: 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-%lu: 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-%lu: REG ACK for unknown "
917 "handle %lx\n", dp->id, ap->handle);
918 return 0;
919 }
920 printk(KERN_INFO "ds-%lu: 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-%lu: REG NACK for "
929 "unknown handle %lx\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(&ds_work_list, &todo);
977 INIT_LIST_HEAD(&ds_work_list);
978 spin_unlock_irqrestore(&ds_lock, flags);
979
980 list_for_each_entry_safe(qp, tmp, &todo, list) {
981 struct ds_data *dpkt = (struct ds_data *) qp->req;
982 struct ds_info *dp = qp->dp;
983 struct ds_cap_state *cp = find_cap(dp, dpkt->handle);
984 int req_len = qp->req_len;
985
986 if (!cp) {
987 printk(KERN_ERR "ds-%lu: Data for unknown "
988 "handle %lu\n",
989 dp->id, dpkt->handle);
990
991 spin_lock_irqsave(&ds_lock, flags);
992 __send_ds_nack(dp, dpkt->handle);
993 spin_unlock_irqrestore(&ds_lock, flags);
994 } else {
995 cp->data(dp, cp, dpkt, req_len);
996 }
997
998 list_del(&qp->list);
999 kfree(qp);
1000 }
1001 }
1002
1003 static int ds_thread(void *__unused)
1004 {
1005 DEFINE_WAIT(wait);
1006
1007 while (1) {
1008 prepare_to_wait(&ds_wait, &wait, TASK_INTERRUPTIBLE);
1009 if (list_empty(&ds_work_list))
1010 schedule();
1011 finish_wait(&ds_wait, &wait);
1012
1013 if (kthread_should_stop())
1014 break;
1015
1016 process_ds_work();
1017 }
1018
1019 return 0;
1020 }
1021
1022 static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len)
1023 {
1024 struct ds_data *dpkt = (struct ds_data *) pkt;
1025 struct ds_queue_entry *qp;
1026
1027 qp = kmalloc(sizeof(struct ds_queue_entry) + len, GFP_ATOMIC);
1028 if (!qp) {
1029 __send_ds_nack(dp, dpkt->handle);
1030 } else {
1031 qp->dp = dp;
1032 memcpy(&qp->req, pkt, len);
1033 list_add_tail(&qp->list, &ds_work_list);
1034 wake_up(&ds_wait);
1035 }
1036 return 0;
1037 }
1038
1039 static void ds_up(struct ds_info *dp)
1040 {
1041 struct ldc_channel *lp = dp->lp;
1042 struct ds_ver_req req;
1043 int err;
1044
1045 req.tag.type = DS_INIT_REQ;
1046 req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag);
1047 req.ver.major = 1;
1048 req.ver.minor = 0;
1049
1050 err = __ds_send(lp, &req, sizeof(req));
1051 if (err > 0)
1052 dp->hs_state = DS_HS_START;
1053 }
1054
1055 static void ds_reset(struct ds_info *dp)
1056 {
1057 int i;
1058
1059 dp->hs_state = 0;
1060
1061 for (i = 0; i < dp->num_ds_states; i++) {
1062 struct ds_cap_state *cp = &dp->ds_states[i];
1063
1064 cp->state = CAP_STATE_UNKNOWN;
1065 }
1066 }
1067
1068 static void ds_event(void *arg, int event)
1069 {
1070 struct ds_info *dp = arg;
1071 struct ldc_channel *lp = dp->lp;
1072 unsigned long flags;
1073 int err;
1074
1075 spin_lock_irqsave(&ds_lock, flags);
1076
1077 if (event == LDC_EVENT_UP) {
1078 ds_up(dp);
1079 spin_unlock_irqrestore(&ds_lock, flags);
1080 return;
1081 }
1082
1083 if (event == LDC_EVENT_RESET) {
1084 ds_reset(dp);
1085 spin_unlock_irqrestore(&ds_lock, flags);
1086 return;
1087 }
1088
1089 if (event != LDC_EVENT_DATA_READY) {
1090 printk(KERN_WARNING "ds-%lu: Unexpected LDC event %d\n",
1091 dp->id, event);
1092 spin_unlock_irqrestore(&ds_lock, flags);
1093 return;
1094 }
1095
1096 err = 0;
1097 while (1) {
1098 struct ds_msg_tag *tag;
1099
1100 err = ldc_read(lp, dp->rcv_buf, sizeof(*tag));
1101
1102 if (unlikely(err < 0)) {
1103 if (err == -ECONNRESET)
1104 ds_conn_reset(dp);
1105 break;
1106 }
1107 if (err == 0)
1108 break;
1109
1110 tag = dp->rcv_buf;
1111 err = ldc_read(lp, tag + 1, tag->len);
1112
1113 if (unlikely(err < 0)) {
1114 if (err == -ECONNRESET)
1115 ds_conn_reset(dp);
1116 break;
1117 }
1118 if (err < tag->len)
1119 break;
1120
1121 if (tag->type < DS_DATA)
1122 err = ds_handshake(dp, dp->rcv_buf);
1123 else
1124 err = ds_data(dp, dp->rcv_buf,
1125 sizeof(*tag) + err);
1126 if (err == -ECONNRESET)
1127 break;
1128 }
1129
1130 spin_unlock_irqrestore(&ds_lock, flags);
1131 }
1132
1133 static int __devinit ds_probe(struct vio_dev *vdev,
1134 const struct vio_device_id *id)
1135 {
1136 static int ds_version_printed;
1137 struct ldc_channel_config ds_cfg = {
1138 .event = ds_event,
1139 .mtu = 4096,
1140 .mode = LDC_MODE_STREAM,
1141 };
1142 struct mdesc_handle *hp;
1143 struct ldc_channel *lp;
1144 struct ds_info *dp;
1145 const u64 *val;
1146 int err, i;
1147
1148 if (ds_version_printed++ == 0)
1149 printk(KERN_INFO "%s", version);
1150
1151 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1152 err = -ENOMEM;
1153 if (!dp)
1154 goto out_err;
1155
1156 hp = mdesc_grab();
1157 val = mdesc_get_property(hp, vdev->mp, "id", NULL);
1158 if (val)
1159 dp->id = *val;
1160 mdesc_release(hp);
1161
1162 dp->rcv_buf = kzalloc(4096, GFP_KERNEL);
1163 if (!dp->rcv_buf)
1164 goto out_free_dp;
1165
1166 dp->rcv_buf_len = 4096;
1167
1168 dp->ds_states = kzalloc(sizeof(ds_states_template),
1169 GFP_KERNEL);
1170 if (!dp->ds_states)
1171 goto out_free_rcv_buf;
1172
1173 memcpy(dp->ds_states, ds_states_template,
1174 sizeof(ds_states_template));
1175 dp->num_ds_states = ARRAY_SIZE(ds_states_template);
1176
1177 for (i = 0; i < dp->num_ds_states; i++)
1178 dp->ds_states[i].handle = ((u64)i << 32);
1179
1180 ds_cfg.tx_irq = vdev->tx_irq;
1181 ds_cfg.rx_irq = vdev->rx_irq;
1182
1183 lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp);
1184 if (IS_ERR(lp)) {
1185 err = PTR_ERR(lp);
1186 goto out_free_ds_states;
1187 }
1188 dp->lp = lp;
1189
1190 err = ldc_bind(lp, "DS");
1191 if (err)
1192 goto out_free_ldc;
1193
1194 spin_lock_irq(&ds_lock);
1195 dp->next = ds_info_list;
1196 ds_info_list = dp;
1197 spin_unlock_irq(&ds_lock);
1198
1199 return err;
1200
1201 out_free_ldc:
1202 ldc_free(dp->lp);
1203
1204 out_free_ds_states:
1205 kfree(dp->ds_states);
1206
1207 out_free_rcv_buf:
1208 kfree(dp->rcv_buf);
1209
1210 out_free_dp:
1211 kfree(dp);
1212
1213 out_err:
1214 return err;
1215 }
1216
1217 static int ds_remove(struct vio_dev *vdev)
1218 {
1219 return 0;
1220 }
1221
1222 static struct vio_device_id ds_match[] = {
1223 {
1224 .type = "domain-services-port",
1225 },
1226 {},
1227 };
1228
1229 static struct vio_driver ds_driver = {
1230 .id_table = ds_match,
1231 .probe = ds_probe,
1232 .remove = ds_remove,
1233 .driver = {
1234 .name = "ds",
1235 .owner = THIS_MODULE,
1236 }
1237 };
1238
1239 static int __init ds_init(void)
1240 {
1241 kthread_run(ds_thread, NULL, "kldomd");
1242
1243 return vio_register_driver(&ds_driver);
1244 }
1245
1246 subsys_initcall(ds_init);
Support for the Chinese Samsung S3C2440 based development boards