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Linux 4.13.16
[linux/fpc-iii.git] / arch / sparc / kernel / ds.c
blobf87265afb1759e16b735e95067044f827dff27e7
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/sched/clock.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/hypervisor.h>
20 #include <asm/ldc.h>
21 #include <asm/vio.h>
22 #include <asm/mdesc.h>
23 #include <asm/head.h>
24 #include <asm/irq.h>
25
26 #include "kernel.h"
27
28 #define DRV_MODULE_NAME "ds"
29 #define PFX DRV_MODULE_NAME ": "
30 #define DRV_MODULE_VERSION "1.0"
31 #define DRV_MODULE_RELDATE "Jul 11, 2007"
32
33 static char version[] =
34 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
35 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
36 MODULE_DESCRIPTION("Sun LDOM domain services driver");
37 MODULE_LICENSE("GPL");
38 MODULE_VERSION(DRV_MODULE_VERSION);
39
40 struct ds_msg_tag {
41 __u32 type;
42 #define DS_INIT_REQ 0x00
43 #define DS_INIT_ACK 0x01
44 #define DS_INIT_NACK 0x02
45 #define DS_REG_REQ 0x03
46 #define DS_REG_ACK 0x04
47 #define DS_REG_NACK 0x05
48 #define DS_UNREG_REQ 0x06
49 #define DS_UNREG_ACK 0x07
50 #define DS_UNREG_NACK 0x08
51 #define DS_DATA 0x09
52 #define DS_NACK 0x0a
53
54 __u32 len;
55 };
56
57 /* Result codes */
58 #define DS_OK 0x00
59 #define DS_REG_VER_NACK 0x01
60 #define DS_REG_DUP 0x02
61 #define DS_INV_HDL 0x03
62 #define DS_TYPE_UNKNOWN 0x04
63
64 struct ds_version {
65 __u16 major;
66 __u16 minor;
67 };
68
69 struct ds_ver_req {
70 struct ds_msg_tag tag;
71 struct ds_version ver;
72 };
73
74 struct ds_ver_ack {
75 struct ds_msg_tag tag;
76 __u16 minor;
77 };
78
79 struct ds_ver_nack {
80 struct ds_msg_tag tag;
81 __u16 major;
82 };
83
84 struct ds_reg_req {
85 struct ds_msg_tag tag;
86 __u64 handle;
87 __u16 major;
88 __u16 minor;
89 char svc_id[0];
90 };
91
92 struct ds_reg_ack {
93 struct ds_msg_tag tag;
94 __u64 handle;
95 __u16 minor;
96 };
97
98 struct ds_reg_nack {
99 struct ds_msg_tag tag;
100 __u64 handle;
101 __u16 major;
102 };
103
104 struct ds_unreg_req {
105 struct ds_msg_tag tag;
106 __u64 handle;
107 };
108
109 struct ds_unreg_ack {
110 struct ds_msg_tag tag;
111 __u64 handle;
112 };
113
114 struct ds_unreg_nack {
115 struct ds_msg_tag tag;
116 __u64 handle;
117 };
118
119 struct ds_data {
120 struct ds_msg_tag tag;
121 __u64 handle;
122 };
123
124 struct ds_data_nack {
125 struct ds_msg_tag tag;
126 __u64 handle;
127 __u64 result;
128 };
129
130 struct ds_info;
131 struct ds_cap_state {
132 __u64 handle;
133
134 void (*data)(struct ds_info *dp,
135 struct ds_cap_state *cp,
136 void *buf, int len);
137
138 const char *service_id;
139
140 u8 state;
141 #define CAP_STATE_UNKNOWN 0x00
142 #define CAP_STATE_REG_SENT 0x01
143 #define CAP_STATE_REGISTERED 0x02
144 };
145
146 static void md_update_data(struct ds_info *dp, struct ds_cap_state *cp,
147 void *buf, int len);
148 static void domain_shutdown_data(struct ds_info *dp,
149 struct ds_cap_state *cp,
150 void *buf, int len);
151 static void domain_panic_data(struct ds_info *dp,
152 struct ds_cap_state *cp,
153 void *buf, int len);
154 #ifdef CONFIG_HOTPLUG_CPU
155 static void dr_cpu_data(struct ds_info *dp,
156 struct ds_cap_state *cp,
157 void *buf, int len);
158 #endif
159 static void ds_pri_data(struct ds_info *dp,
160 struct ds_cap_state *cp,
161 void *buf, int len);
162 static void ds_var_data(struct ds_info *dp,
163 struct ds_cap_state *cp,
164 void *buf, int len);
165
166 static struct ds_cap_state ds_states_template[] = {
167 {
168 .service_id = "md-update",
169 .data = md_update_data,
170 },
171 {
172 .service_id = "domain-shutdown",
173 .data = domain_shutdown_data,
174 },
175 {
176 .service_id = "domain-panic",
177 .data = domain_panic_data,
178 },
179 #ifdef CONFIG_HOTPLUG_CPU
180 {
181 .service_id = "dr-cpu",
182 .data = dr_cpu_data,
183 },
184 #endif
185 {
186 .service_id = "pri",
187 .data = ds_pri_data,
188 },
189 {
190 .service_id = "var-config",
191 .data = ds_var_data,
192 },
193 {
194 .service_id = "var-config-backup",
195 .data = ds_var_data,
196 },
197 };
198
199 static DEFINE_SPINLOCK(ds_lock);
200
201 struct ds_info {
202 struct ldc_channel *lp;
203 u8 hs_state;
204 #define DS_HS_START 0x01
205 #define DS_HS_DONE 0x02
206
207 u64 id;
208
209 void *rcv_buf;
210 int rcv_buf_len;
211
212 struct ds_cap_state *ds_states;
213 int num_ds_states;
214
215 struct ds_info *next;
216 };
217
218 static struct ds_info *ds_info_list;
219
220 static struct ds_cap_state *find_cap(struct ds_info *dp, u64 handle)
221 {
222 unsigned int index = handle >> 32;
223
224 if (index >= dp->num_ds_states)
225 return NULL;
226 return &dp->ds_states[index];
227 }
228
229 static struct ds_cap_state *find_cap_by_string(struct ds_info *dp,
230 const char *name)
231 {
232 int i;
233
234 for (i = 0; i < dp->num_ds_states; i++) {
235 if (strcmp(dp->ds_states[i].service_id, name))
236 continue;
237
238 return &dp->ds_states[i];
239 }
240 return NULL;
241 }
242
243 static int __ds_send(struct ldc_channel *lp, void *data, int len)
244 {
245 int err, limit = 1000;
246
247 err = -EINVAL;
248 while (limit-- > 0) {
249 err = ldc_write(lp, data, len);
250 if (!err || (err != -EAGAIN))
251 break;
252 udelay(1);
253 }
254
255 return err;
256 }
257
258 static int ds_send(struct ldc_channel *lp, void *data, int len)
259 {
260 unsigned long flags;
261 int err;
262
263 spin_lock_irqsave(&ds_lock, flags);
264 err = __ds_send(lp, data, len);
265 spin_unlock_irqrestore(&ds_lock, flags);
266
267 return err;
268 }
269
270 struct ds_md_update_req {
271 __u64 req_num;
272 };
273
274 struct ds_md_update_res {
275 __u64 req_num;
276 __u32 result;
277 };
278
279 static void md_update_data(struct ds_info *dp,
280 struct ds_cap_state *cp,
281 void *buf, int len)
282 {
283 struct ldc_channel *lp = dp->lp;
284 struct ds_data *dpkt = buf;
285 struct ds_md_update_req *rp;
286 struct {
287 struct ds_data data;
288 struct ds_md_update_res res;
289 } pkt;
290
291 rp = (struct ds_md_update_req *) (dpkt + 1);
292
293 printk(KERN_INFO "ds-%llu: Machine description update.\n", dp->id);
294
295 mdesc_update();
296
297 memset(&pkt, 0, sizeof(pkt));
298 pkt.data.tag.type = DS_DATA;
299 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
300 pkt.data.handle = cp->handle;
301 pkt.res.req_num = rp->req_num;
302 pkt.res.result = DS_OK;
303
304 ds_send(lp, &pkt, sizeof(pkt));
305 }
306
307 struct ds_shutdown_req {
308 __u64 req_num;
309 __u32 ms_delay;
310 };
311
312 struct ds_shutdown_res {
313 __u64 req_num;
314 __u32 result;
315 char reason[1];
316 };
317
318 static void domain_shutdown_data(struct ds_info *dp,
319 struct ds_cap_state *cp,
320 void *buf, int len)
321 {
322 struct ldc_channel *lp = dp->lp;
323 struct ds_data *dpkt = buf;
324 struct ds_shutdown_req *rp;
325 struct {
326 struct ds_data data;
327 struct ds_shutdown_res res;
328 } pkt;
329
330 rp = (struct ds_shutdown_req *) (dpkt + 1);
331
332 printk(KERN_ALERT "ds-%llu: Shutdown request from "
333 "LDOM manager received.\n", dp->id);
334
335 memset(&pkt, 0, sizeof(pkt));
336 pkt.data.tag.type = DS_DATA;
337 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
338 pkt.data.handle = cp->handle;
339 pkt.res.req_num = rp->req_num;
340 pkt.res.result = DS_OK;
341 pkt.res.reason[0] = 0;
342
343 ds_send(lp, &pkt, sizeof(pkt));
344
345 orderly_poweroff(true);
346 }
347
348 struct ds_panic_req {
349 __u64 req_num;
350 };
351
352 struct ds_panic_res {
353 __u64 req_num;
354 __u32 result;
355 char reason[1];
356 };
357
358 static void domain_panic_data(struct ds_info *dp,
359 struct ds_cap_state *cp,
360 void *buf, int len)
361 {
362 struct ldc_channel *lp = dp->lp;
363 struct ds_data *dpkt = buf;
364 struct ds_panic_req *rp;
365 struct {
366 struct ds_data data;
367 struct ds_panic_res res;
368 } pkt;
369
370 rp = (struct ds_panic_req *) (dpkt + 1);
371
372 printk(KERN_ALERT "ds-%llu: Panic request from "
373 "LDOM manager received.\n", dp->id);
374
375 memset(&pkt, 0, sizeof(pkt));
376 pkt.data.tag.type = DS_DATA;
377 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
378 pkt.data.handle = cp->handle;
379 pkt.res.req_num = rp->req_num;
380 pkt.res.result = DS_OK;
381 pkt.res.reason[0] = 0;
382
383 ds_send(lp, &pkt, sizeof(pkt));
384
385 panic("PANIC requested by LDOM manager.");
386 }
387
388 #ifdef CONFIG_HOTPLUG_CPU
389 struct dr_cpu_tag {
390 __u64 req_num;
391 __u32 type;
392 #define DR_CPU_CONFIGURE 0x43
393 #define DR_CPU_UNCONFIGURE 0x55
394 #define DR_CPU_FORCE_UNCONFIGURE 0x46
395 #define DR_CPU_STATUS 0x53
396
397 /* Responses */
398 #define DR_CPU_OK 0x6f
399 #define DR_CPU_ERROR 0x65
400
401 __u32 num_records;
402 };
403
404 struct dr_cpu_resp_entry {
405 __u32 cpu;
406 __u32 result;
407 #define DR_CPU_RES_OK 0x00
408 #define DR_CPU_RES_FAILURE 0x01
409 #define DR_CPU_RES_BLOCKED 0x02
410 #define DR_CPU_RES_CPU_NOT_RESPONDING 0x03
411 #define DR_CPU_RES_NOT_IN_MD 0x04
412
413 __u32 stat;
414 #define DR_CPU_STAT_NOT_PRESENT 0x00
415 #define DR_CPU_STAT_UNCONFIGURED 0x01
416 #define DR_CPU_STAT_CONFIGURED 0x02
417
418 __u32 str_off;
419 };
420
421 static void __dr_cpu_send_error(struct ds_info *dp,
422 struct ds_cap_state *cp,
423 struct ds_data *data)
424 {
425 struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
426 struct {
427 struct ds_data data;
428 struct dr_cpu_tag tag;
429 } pkt;
430 int msg_len;
431
432 memset(&pkt, 0, sizeof(pkt));
433 pkt.data.tag.type = DS_DATA;
434 pkt.data.handle = cp->handle;
435 pkt.tag.req_num = tag->req_num;
436 pkt.tag.type = DR_CPU_ERROR;
437 pkt.tag.num_records = 0;
438
439 msg_len = (sizeof(struct ds_data) +
440 sizeof(struct dr_cpu_tag));
441
442 pkt.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
443
444 __ds_send(dp->lp, &pkt, msg_len);
445 }
446
447 static void dr_cpu_send_error(struct ds_info *dp,
448 struct ds_cap_state *cp,
449 struct ds_data *data)
450 {
451 unsigned long flags;
452
453 spin_lock_irqsave(&ds_lock, flags);
454 __dr_cpu_send_error(dp, cp, data);
455 spin_unlock_irqrestore(&ds_lock, flags);
456 }
457
458 #define CPU_SENTINEL 0xffffffff
459
460 static void purge_dups(u32 *list, u32 num_ents)
461 {
462 unsigned int i;
463
464 for (i = 0; i < num_ents; i++) {
465 u32 cpu = list[i];
466 unsigned int j;
467
468 if (cpu == CPU_SENTINEL)
469 continue;
470
471 for (j = i + 1; j < num_ents; j++) {
472 if (list[j] == cpu)
473 list[j] = CPU_SENTINEL;
474 }
475 }
476 }
477
478 static int dr_cpu_size_response(int ncpus)
479 {
480 return (sizeof(struct ds_data) +
481 sizeof(struct dr_cpu_tag) +
482 (sizeof(struct dr_cpu_resp_entry) * ncpus));
483 }
484
485 static void dr_cpu_init_response(struct ds_data *resp, u64 req_num,
486 u64 handle, int resp_len, int ncpus,
487 cpumask_t *mask, u32 default_stat)
488 {
489 struct dr_cpu_resp_entry *ent;
490 struct dr_cpu_tag *tag;
491 int i, cpu;
492
493 tag = (struct dr_cpu_tag *) (resp + 1);
494 ent = (struct dr_cpu_resp_entry *) (tag + 1);
495
496 resp->tag.type = DS_DATA;
497 resp->tag.len = resp_len - sizeof(struct ds_msg_tag);
498 resp->handle = handle;
499 tag->req_num = req_num;
500 tag->type = DR_CPU_OK;
501 tag->num_records = ncpus;
502
503 i = 0;
504 for_each_cpu(cpu, mask) {
505 ent[i].cpu = cpu;
506 ent[i].result = DR_CPU_RES_OK;
507 ent[i].stat = default_stat;
508 i++;
509 }
510 BUG_ON(i != ncpus);
511 }
512
513 static void dr_cpu_mark(struct ds_data *resp, int cpu, int ncpus,
514 u32 res, u32 stat)
515 {
516 struct dr_cpu_resp_entry *ent;
517 struct dr_cpu_tag *tag;
518 int i;
519
520 tag = (struct dr_cpu_tag *) (resp + 1);
521 ent = (struct dr_cpu_resp_entry *) (tag + 1);
522
523 for (i = 0; i < ncpus; i++) {
524 if (ent[i].cpu != cpu)
525 continue;
526 ent[i].result = res;
527 ent[i].stat = stat;
528 break;
529 }
530 }
531
532 static int dr_cpu_configure(struct ds_info *dp, struct ds_cap_state *cp,
533 u64 req_num, cpumask_t *mask)
534 {
535 struct ds_data *resp;
536 int resp_len, ncpus, cpu;
537 unsigned long flags;
538
539 ncpus = cpumask_weight(mask);
540 resp_len = dr_cpu_size_response(ncpus);
541 resp = kzalloc(resp_len, GFP_KERNEL);
542 if (!resp)
543 return -ENOMEM;
544
545 dr_cpu_init_response(resp, req_num, cp->handle,
546 resp_len, ncpus, mask,
547 DR_CPU_STAT_CONFIGURED);
548
549 mdesc_populate_present_mask(mask);
550 mdesc_fill_in_cpu_data(mask);
551
552 for_each_cpu(cpu, mask) {
553 int err;
554
555 printk(KERN_INFO "ds-%llu: Starting cpu %d...\n",
556 dp->id, cpu);
557 err = cpu_up(cpu);
558 if (err) {
559 __u32 res = DR_CPU_RES_FAILURE;
560 __u32 stat = DR_CPU_STAT_UNCONFIGURED;
561
562 if (!cpu_present(cpu)) {
563 /* CPU not present in MD */
564 res = DR_CPU_RES_NOT_IN_MD;
565 stat = DR_CPU_STAT_NOT_PRESENT;
566 } else if (err == -ENODEV) {
567 /* CPU did not call in successfully */
568 res = DR_CPU_RES_CPU_NOT_RESPONDING;
569 }
570
571 printk(KERN_INFO "ds-%llu: CPU startup failed err=%d\n",
572 dp->id, err);
573 dr_cpu_mark(resp, cpu, ncpus, res, stat);
574 }
575 }
576
577 spin_lock_irqsave(&ds_lock, flags);
578 __ds_send(dp->lp, resp, resp_len);
579 spin_unlock_irqrestore(&ds_lock, flags);
580
581 kfree(resp);
582
583 /* Redistribute IRQs, taking into account the new cpus. */
584 fixup_irqs();
585
586 return 0;
587 }
588
589 static int dr_cpu_unconfigure(struct ds_info *dp,
590 struct ds_cap_state *cp,
591 u64 req_num,
592 cpumask_t *mask)
593 {
594 struct ds_data *resp;
595 int resp_len, ncpus, cpu;
596 unsigned long flags;
597
598 ncpus = cpumask_weight(mask);
599 resp_len = dr_cpu_size_response(ncpus);
600 resp = kzalloc(resp_len, GFP_KERNEL);
601 if (!resp)
602 return -ENOMEM;
603
604 dr_cpu_init_response(resp, req_num, cp->handle,
605 resp_len, ncpus, mask,
606 DR_CPU_STAT_UNCONFIGURED);
607
608 for_each_cpu(cpu, mask) {
609 int err;
610
611 printk(KERN_INFO "ds-%llu: Shutting down cpu %d...\n",
612 dp->id, cpu);
613 err = cpu_down(cpu);
614 if (err)
615 dr_cpu_mark(resp, cpu, ncpus,
616 DR_CPU_RES_FAILURE,
617 DR_CPU_STAT_CONFIGURED);
618 }
619
620 spin_lock_irqsave(&ds_lock, flags);
621 __ds_send(dp->lp, resp, resp_len);
622 spin_unlock_irqrestore(&ds_lock, flags);
623
624 kfree(resp);
625
626 return 0;
627 }
628
629 static void dr_cpu_data(struct ds_info *dp, struct ds_cap_state *cp, void *buf,
630 int len)
631 {
632 struct ds_data *data = buf;
633 struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
634 u32 *cpu_list = (u32 *) (tag + 1);
635 u64 req_num = tag->req_num;
636 cpumask_t mask;
637 unsigned int i;
638 int err;
639
640 switch (tag->type) {
641 case DR_CPU_CONFIGURE:
642 case DR_CPU_UNCONFIGURE:
643 case DR_CPU_FORCE_UNCONFIGURE:
644 break;
645
646 default:
647 dr_cpu_send_error(dp, cp, data);
648 return;
649 }
650
651 purge_dups(cpu_list, tag->num_records);
652
653 cpumask_clear(&mask);
654 for (i = 0; i < tag->num_records; i++) {
655 if (cpu_list[i] == CPU_SENTINEL)
656 continue;
657
658 if (cpu_list[i] < nr_cpu_ids)
659 cpumask_set_cpu(cpu_list[i], &mask);
660 }
661
662 if (tag->type == DR_CPU_CONFIGURE)
663 err = dr_cpu_configure(dp, cp, req_num, &mask);
664 else
665 err = dr_cpu_unconfigure(dp, cp, req_num, &mask);
666
667 if (err)
668 dr_cpu_send_error(dp, cp, data);
669 }
670 #endif /* CONFIG_HOTPLUG_CPU */
671
672 struct ds_pri_msg {
673 __u64 req_num;
674 __u64 type;
675 #define DS_PRI_REQUEST 0x00
676 #define DS_PRI_DATA 0x01
677 #define DS_PRI_UPDATE 0x02
678 };
679
680 static void ds_pri_data(struct ds_info *dp,
681 struct ds_cap_state *cp,
682 void *buf, int len)
683 {
684 struct ds_data *dpkt = buf;
685 struct ds_pri_msg *rp;
686
687 rp = (struct ds_pri_msg *) (dpkt + 1);
688
689 printk(KERN_INFO "ds-%llu: PRI REQ [%llx:%llx], len=%d\n",
690 dp->id, rp->req_num, rp->type, len);
691 }
692
693 struct ds_var_hdr {
694 __u32 type;
695 #define DS_VAR_SET_REQ 0x00
696 #define DS_VAR_DELETE_REQ 0x01
697 #define DS_VAR_SET_RESP 0x02
698 #define DS_VAR_DELETE_RESP 0x03
699 };
700
701 struct ds_var_set_msg {
702 struct ds_var_hdr hdr;
703 char name_and_value[0];
704 };
705
706 struct ds_var_delete_msg {
707 struct ds_var_hdr hdr;
708 char name[0];
709 };
710
711 struct ds_var_resp {
712 struct ds_var_hdr hdr;
713 __u32 result;
714 #define DS_VAR_SUCCESS 0x00
715 #define DS_VAR_NO_SPACE 0x01
716 #define DS_VAR_INVALID_VAR 0x02
717 #define DS_VAR_INVALID_VAL 0x03
718 #define DS_VAR_NOT_PRESENT 0x04
719 };
720
721 static DEFINE_MUTEX(ds_var_mutex);
722 static int ds_var_doorbell;
723 static int ds_var_response;
724
725 static void ds_var_data(struct ds_info *dp,
726 struct ds_cap_state *cp,
727 void *buf, int len)
728 {
729 struct ds_data *dpkt = buf;
730 struct ds_var_resp *rp;
731
732 rp = (struct ds_var_resp *) (dpkt + 1);
733
734 if (rp->hdr.type != DS_VAR_SET_RESP &&
735 rp->hdr.type != DS_VAR_DELETE_RESP)
736 return;
737
738 ds_var_response = rp->result;
739 wmb();
740 ds_var_doorbell = 1;
741 }
742
743 void ldom_set_var(const char *var, const char *value)
744 {
745 struct ds_cap_state *cp;
746 struct ds_info *dp;
747 unsigned long flags;
748
749 spin_lock_irqsave(&ds_lock, flags);
750 cp = NULL;
751 for (dp = ds_info_list; dp; dp = dp->next) {
752 struct ds_cap_state *tmp;
753
754 tmp = find_cap_by_string(dp, "var-config");
755 if (tmp && tmp->state == CAP_STATE_REGISTERED) {
756 cp = tmp;
757 break;
758 }
759 }
760 if (!cp) {
761 for (dp = ds_info_list; dp; dp = dp->next) {
762 struct ds_cap_state *tmp;
763
764 tmp = find_cap_by_string(dp, "var-config-backup");
765 if (tmp && tmp->state == CAP_STATE_REGISTERED) {
766 cp = tmp;
767 break;
768 }
769 }
770 }
771 spin_unlock_irqrestore(&ds_lock, flags);
772
773 if (cp) {
774 union {
775 struct {
776 struct ds_data data;
777 struct ds_var_set_msg msg;
778 } header;
779 char all[512];
780 } pkt;
781 char *base, *p;
782 int msg_len, loops;
783
784 if (strlen(var) + strlen(value) + 2 >
785 sizeof(pkt) - sizeof(pkt.header)) {
786 printk(KERN_ERR PFX
787 "contents length: %zu, which more than max: %lu,"
788 "so could not set (%s) variable to (%s).\n",
789 strlen(var) + strlen(value) + 2,
790 sizeof(pkt) - sizeof(pkt.header), var, value);
791 return;
792 }
793
794 memset(&pkt, 0, sizeof(pkt));
795 pkt.header.data.tag.type = DS_DATA;
796 pkt.header.data.handle = cp->handle;
797 pkt.header.msg.hdr.type = DS_VAR_SET_REQ;
798 base = p = &pkt.header.msg.name_and_value[0];
799 strcpy(p, var);
800 p += strlen(var) + 1;
801 strcpy(p, value);
802 p += strlen(value) + 1;
803
804 msg_len = (sizeof(struct ds_data) +
805 sizeof(struct ds_var_set_msg) +
806 (p - base));
807 msg_len = (msg_len + 3) & ~3;
808 pkt.header.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
809
810 mutex_lock(&ds_var_mutex);
811
812 spin_lock_irqsave(&ds_lock, flags);
813 ds_var_doorbell = 0;
814 ds_var_response = -1;
815
816 __ds_send(dp->lp, &pkt, msg_len);
817 spin_unlock_irqrestore(&ds_lock, flags);
818
819 loops = 1000;
820 while (ds_var_doorbell == 0) {
821 if (loops-- < 0)
822 break;
823 barrier();
824 udelay(100);
825 }
826
827 mutex_unlock(&ds_var_mutex);
828
829 if (ds_var_doorbell == 0 ||
830 ds_var_response != DS_VAR_SUCCESS)
831 printk(KERN_ERR "ds-%llu: var-config [%s:%s] "
832 "failed, response(%d).\n",
833 dp->id, var, value,
834 ds_var_response);
835 } else {
836 printk(KERN_ERR PFX "var-config not registered so "
837 "could not set (%s) variable to (%s).\n",
838 var, value);
839 }
840 }
841
842 static char full_boot_str[256] __attribute__((aligned(32)));
843 static int reboot_data_supported;
844
845 void ldom_reboot(const char *boot_command)
846 {
847 /* Don't bother with any of this if the boot_command
848 * is empty.
849 */
850 if (boot_command && strlen(boot_command)) {
851 unsigned long len;
852
853 snprintf(full_boot_str, sizeof(full_boot_str), "boot %s",
854 boot_command);
855 len = strlen(full_boot_str);
856
857 if (reboot_data_supported) {
858 unsigned long ra = kimage_addr_to_ra(full_boot_str);
859 unsigned long hv_ret;
860
861 hv_ret = sun4v_reboot_data_set(ra, len);
862 if (hv_ret != HV_EOK)
863 pr_err("SUN4V: Unable to set reboot data "
864 "hv_ret=%lu\n", hv_ret);
865 } else {
866 ldom_set_var("reboot-command", full_boot_str);
867 }
868 }
869 sun4v_mach_sir();
870 }
871
872 void ldom_power_off(void)
873 {
874 sun4v_mach_exit(0);
875 }
876
877 static void ds_conn_reset(struct ds_info *dp)
878 {
879 printk(KERN_ERR "ds-%llu: ds_conn_reset() from %pf\n",
880 dp->id, __builtin_return_address(0));
881 }
882
883 static int register_services(struct ds_info *dp)
884 {
885 struct ldc_channel *lp = dp->lp;
886 int i;
887
888 for (i = 0; i < dp->num_ds_states; i++) {
889 struct {
890 struct ds_reg_req req;
891 u8 id_buf[256];
892 } pbuf;
893 struct ds_cap_state *cp = &dp->ds_states[i];
894 int err, msg_len;
895 u64 new_count;
896
897 if (cp->state == CAP_STATE_REGISTERED)
898 continue;
899
900 new_count = sched_clock() & 0xffffffff;
901 cp->handle = ((u64) i << 32) | new_count;
902
903 msg_len = (sizeof(struct ds_reg_req) +
904 strlen(cp->service_id));
905
906 memset(&pbuf, 0, sizeof(pbuf));
907 pbuf.req.tag.type = DS_REG_REQ;
908 pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag));
909 pbuf.req.handle = cp->handle;
910 pbuf.req.major = 1;
911 pbuf.req.minor = 0;
912 strcpy(pbuf.id_buf, cp->service_id);
913
914 err = __ds_send(lp, &pbuf, msg_len);
915 if (err > 0)
916 cp->state = CAP_STATE_REG_SENT;
917 }
918 return 0;
919 }
920
921 static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt)
922 {
923
924 if (dp->hs_state == DS_HS_START) {
925 if (pkt->type != DS_INIT_ACK)
926 goto conn_reset;
927
928 dp->hs_state = DS_HS_DONE;
929
930 return register_services(dp);
931 }
932
933 if (dp->hs_state != DS_HS_DONE)
934 goto conn_reset;
935
936 if (pkt->type == DS_REG_ACK) {
937 struct ds_reg_ack *ap = (struct ds_reg_ack *) pkt;
938 struct ds_cap_state *cp = find_cap(dp, ap->handle);
939
940 if (!cp) {
941 printk(KERN_ERR "ds-%llu: REG ACK for unknown "
942 "handle %llx\n", dp->id, ap->handle);
943 return 0;
944 }
945 printk(KERN_INFO "ds-%llu: Registered %s service.\n",
946 dp->id, cp->service_id);
947 cp->state = CAP_STATE_REGISTERED;
948 } else if (pkt->type == DS_REG_NACK) {
949 struct ds_reg_nack *np = (struct ds_reg_nack *) pkt;
950 struct ds_cap_state *cp = find_cap(dp, np->handle);
951
952 if (!cp) {
953 printk(KERN_ERR "ds-%llu: REG NACK for "
954 "unknown handle %llx\n",
955 dp->id, np->handle);
956 return 0;
957 }
958 cp->state = CAP_STATE_UNKNOWN;
959 }
960
961 return 0;
962
963 conn_reset:
964 ds_conn_reset(dp);
965 return -ECONNRESET;
966 }
967
968 static void __send_ds_nack(struct ds_info *dp, u64 handle)
969 {
970 struct ds_data_nack nack = {
971 .tag = {
972 .type = DS_NACK,
973 .len = (sizeof(struct ds_data_nack) -
974 sizeof(struct ds_msg_tag)),
975 },
976 .handle = handle,
977 .result = DS_INV_HDL,
978 };
979
980 __ds_send(dp->lp, &nack, sizeof(nack));
981 }
982
983 static LIST_HEAD(ds_work_list);
984 static DECLARE_WAIT_QUEUE_HEAD(ds_wait);
985
986 struct ds_queue_entry {
987 struct list_head list;
988 struct ds_info *dp;
989 int req_len;
990 int __pad;
991 u64 req[0];
992 };
993
994 static void process_ds_work(void)
995 {
996 struct ds_queue_entry *qp, *tmp;
997 unsigned long flags;
998 LIST_HEAD(todo);
999
1000 spin_lock_irqsave(&ds_lock, flags);
1001 list_splice_init(&ds_work_list, &todo);
1002 spin_unlock_irqrestore(&ds_lock, flags);
1003
1004 list_for_each_entry_safe(qp, tmp, &todo, list) {
1005 struct ds_data *dpkt = (struct ds_data *) qp->req;
1006 struct ds_info *dp = qp->dp;
1007 struct ds_cap_state *cp = find_cap(dp, dpkt->handle);
1008 int req_len = qp->req_len;
1009
1010 if (!cp) {
1011 printk(KERN_ERR "ds-%llu: Data for unknown "
1012 "handle %llu\n",
1013 dp->id, dpkt->handle);
1014
1015 spin_lock_irqsave(&ds_lock, flags);
1016 __send_ds_nack(dp, dpkt->handle);
1017 spin_unlock_irqrestore(&ds_lock, flags);
1018 } else {
1019 cp->data(dp, cp, dpkt, req_len);
1020 }
1021
1022 list_del(&qp->list);
1023 kfree(qp);
1024 }
1025 }
1026
1027 static int ds_thread(void *__unused)
1028 {
1029 DEFINE_WAIT(wait);
1030
1031 while (1) {
1032 prepare_to_wait(&ds_wait, &wait, TASK_INTERRUPTIBLE);
1033 if (list_empty(&ds_work_list))
1034 schedule();
1035 finish_wait(&ds_wait, &wait);
1036
1037 if (kthread_should_stop())
1038 break;
1039
1040 process_ds_work();
1041 }
1042
1043 return 0;
1044 }
1045
1046 static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len)
1047 {
1048 struct ds_data *dpkt = (struct ds_data *) pkt;
1049 struct ds_queue_entry *qp;
1050
1051 qp = kmalloc(sizeof(struct ds_queue_entry) + len, GFP_ATOMIC);
1052 if (!qp) {
1053 __send_ds_nack(dp, dpkt->handle);
1054 } else {
1055 qp->dp = dp;
1056 memcpy(&qp->req, pkt, len);
1057 list_add_tail(&qp->list, &ds_work_list);
1058 wake_up(&ds_wait);
1059 }
1060 return 0;
1061 }
1062
1063 static void ds_up(struct ds_info *dp)
1064 {
1065 struct ldc_channel *lp = dp->lp;
1066 struct ds_ver_req req;
1067 int err;
1068
1069 req.tag.type = DS_INIT_REQ;
1070 req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag);
1071 req.ver.major = 1;
1072 req.ver.minor = 0;
1073
1074 err = __ds_send(lp, &req, sizeof(req));
1075 if (err > 0)
1076 dp->hs_state = DS_HS_START;
1077 }
1078
1079 static void ds_reset(struct ds_info *dp)
1080 {
1081 int i;
1082
1083 dp->hs_state = 0;
1084
1085 for (i = 0; i < dp->num_ds_states; i++) {
1086 struct ds_cap_state *cp = &dp->ds_states[i];
1087
1088 cp->state = CAP_STATE_UNKNOWN;
1089 }
1090 }
1091
1092 static void ds_event(void *arg, int event)
1093 {
1094 struct ds_info *dp = arg;
1095 struct ldc_channel *lp = dp->lp;
1096 unsigned long flags;
1097 int err;
1098
1099 spin_lock_irqsave(&ds_lock, flags);
1100
1101 if (event == LDC_EVENT_UP) {
1102 ds_up(dp);
1103 spin_unlock_irqrestore(&ds_lock, flags);
1104 return;
1105 }
1106
1107 if (event == LDC_EVENT_RESET) {
1108 ds_reset(dp);
1109 spin_unlock_irqrestore(&ds_lock, flags);
1110 return;
1111 }
1112
1113 if (event != LDC_EVENT_DATA_READY) {
1114 printk(KERN_WARNING "ds-%llu: Unexpected LDC event %d\n",
1115 dp->id, event);
1116 spin_unlock_irqrestore(&ds_lock, flags);
1117 return;
1118 }
1119
1120 err = 0;
1121 while (1) {
1122 struct ds_msg_tag *tag;
1123
1124 err = ldc_read(lp, dp->rcv_buf, sizeof(*tag));
1125
1126 if (unlikely(err < 0)) {
1127 if (err == -ECONNRESET)
1128 ds_conn_reset(dp);
1129 break;
1130 }
1131 if (err == 0)
1132 break;
1133
1134 tag = dp->rcv_buf;
1135 err = ldc_read(lp, tag + 1, tag->len);
1136
1137 if (unlikely(err < 0)) {
1138 if (err == -ECONNRESET)
1139 ds_conn_reset(dp);
1140 break;
1141 }
1142 if (err < tag->len)
1143 break;
1144
1145 if (tag->type < DS_DATA)
1146 err = ds_handshake(dp, dp->rcv_buf);
1147 else
1148 err = ds_data(dp, dp->rcv_buf,
1149 sizeof(*tag) + err);
1150 if (err == -ECONNRESET)
1151 break;
1152 }
1153
1154 spin_unlock_irqrestore(&ds_lock, flags);
1155 }
1156
1157 static int ds_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1158 {
1159 static int ds_version_printed;
1160 struct ldc_channel_config ds_cfg = {
1161 .event = ds_event,
1162 .mtu = 4096,
1163 .mode = LDC_MODE_STREAM,
1164 };
1165 struct mdesc_handle *hp;
1166 struct ldc_channel *lp;
1167 struct ds_info *dp;
1168 const u64 *val;
1169 int err, i;
1170
1171 if (ds_version_printed++ == 0)
1172 printk(KERN_INFO "%s", version);
1173
1174 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1175 err = -ENOMEM;
1176 if (!dp)
1177 goto out_err;
1178
1179 hp = mdesc_grab();
1180 val = mdesc_get_property(hp, vdev->mp, "id", NULL);
1181 if (val)
1182 dp->id = *val;
1183 mdesc_release(hp);
1184
1185 dp->rcv_buf = kzalloc(4096, GFP_KERNEL);
1186 if (!dp->rcv_buf)
1187 goto out_free_dp;
1188
1189 dp->rcv_buf_len = 4096;
1190
1191 dp->ds_states = kmemdup(ds_states_template,
1192 sizeof(ds_states_template), GFP_KERNEL);
1193 if (!dp->ds_states)
1194 goto out_free_rcv_buf;
1195
1196 dp->num_ds_states = ARRAY_SIZE(ds_states_template);
1197
1198 for (i = 0; i < dp->num_ds_states; i++)
1199 dp->ds_states[i].handle = ((u64)i << 32);
1200
1201 ds_cfg.tx_irq = vdev->tx_irq;
1202 ds_cfg.rx_irq = vdev->rx_irq;
1203
1204 lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp, "DS");
1205 if (IS_ERR(lp)) {
1206 err = PTR_ERR(lp);
1207 goto out_free_ds_states;
1208 }
1209 dp->lp = lp;
1210
1211 err = ldc_bind(lp);
1212 if (err)
1213 goto out_free_ldc;
1214
1215 spin_lock_irq(&ds_lock);
1216 dp->next = ds_info_list;
1217 ds_info_list = dp;
1218 spin_unlock_irq(&ds_lock);
1219
1220 return err;
1221
1222 out_free_ldc:
1223 ldc_free(dp->lp);
1224
1225 out_free_ds_states:
1226 kfree(dp->ds_states);
1227
1228 out_free_rcv_buf:
1229 kfree(dp->rcv_buf);
1230
1231 out_free_dp:
1232 kfree(dp);
1233
1234 out_err:
1235 return err;
1236 }
1237
1238 static int ds_remove(struct vio_dev *vdev)
1239 {
1240 return 0;
1241 }
1242
1243 static const struct vio_device_id ds_match[] = {
1244 {
1245 .type = "domain-services-port",
1246 },
1247 {},
1248 };
1249
1250 static struct vio_driver ds_driver = {
1251 .id_table = ds_match,
1252 .probe = ds_probe,
1253 .remove = ds_remove,
1254 .name = "ds",
1255 };
1256
1257 static int __init ds_init(void)
1258 {
1259 unsigned long hv_ret, major, minor;
1260
1261 if (tlb_type == hypervisor) {
1262 hv_ret = sun4v_get_version(HV_GRP_REBOOT_DATA, &major, &minor);
1263 if (hv_ret == HV_EOK) {
1264 pr_info("SUN4V: Reboot data supported (maj=%lu,min=%lu).\n",
1265 major, minor);
1266 reboot_data_supported = 1;
1267 }
1268 }
1269 kthread_run(ds_thread, NULL, "kldomd");
1270
1271 return vio_register_driver(&ds_driver);
1272 }
1273
1274 fs_initcall(ds_init);
Linux with added FPC-III support