1 // SPDX-License-Identifier: GPL-2.0-only
2 /* ds.c: Domain Services driver for Logical Domains
3 *
4 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
5 */
6
7 #include <linux/kernel.h>
8 #include <linux/module.h>
9 #include <linux/types.h>
10 #include <linux/string.h>
11 #include <linux/slab.h>
12 #include <linux/sched.h>
13 #include <linux/sched/clock.h>
14 #include <linux/delay.h>
15 #include <linux/mutex.h>
16 #include <linux/kthread.h>
17 #include <linux/reboot.h>
18 #include <linux/cpu.h>
19
20 #include <asm/hypervisor.h>
21 #include <asm/ldc.h>
22 #include <asm/vio.h>
23 #include <asm/mdesc.h>
24 #include <asm/head.h>
25 #include <asm/irq.h>
26
27 #include "kernel.h"
28
29 #define DRV_MODULE_NAME "ds"
30 #define PFX DRV_MODULE_NAME ": "
31 #define DRV_MODULE_VERSION "1.0"
32 #define DRV_MODULE_RELDATE "Jul 11, 2007"
33
34 static char version[] =
35 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
36 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
37 MODULE_DESCRIPTION("Sun LDOM domain services driver");
38 MODULE_LICENSE("GPL");
39 MODULE_VERSION(DRV_MODULE_VERSION);
40
41 struct ds_msg_tag {
42 __u32 type;
43 #define DS_INIT_REQ 0x00
44 #define DS_INIT_ACK 0x01
45 #define DS_INIT_NACK 0x02
46 #define DS_REG_REQ 0x03
47 #define DS_REG_ACK 0x04
48 #define DS_REG_NACK 0x05
49 #define DS_UNREG_REQ 0x06
50 #define DS_UNREG_ACK 0x07
51 #define DS_UNREG_NACK 0x08
52 #define DS_DATA 0x09
53 #define DS_NACK 0x0a
54
55 __u32 len;
56 };
57
58 /* Result codes */
59 #define DS_OK 0x00
60 #define DS_REG_VER_NACK 0x01
61 #define DS_REG_DUP 0x02
62 #define DS_INV_HDL 0x03
63 #define DS_TYPE_UNKNOWN 0x04
64
65 struct ds_version {
66 __u16 major;
67 __u16 minor;
68 };
69
70 struct ds_ver_req {
71 struct ds_msg_tag tag;
72 struct ds_version ver;
73 };
74
75 struct ds_ver_ack {
76 struct ds_msg_tag tag;
77 __u16 minor;
78 };
79
80 struct ds_ver_nack {
81 struct ds_msg_tag tag;
82 __u16 major;
83 };
84
85 struct ds_reg_req {
86 struct ds_msg_tag tag;
87 __u64 handle;
88 __u16 major;
89 __u16 minor;
90 char svc_id[];
91 };
92
93 struct ds_reg_ack {
94 struct ds_msg_tag tag;
95 __u64 handle;
96 __u16 minor;
97 };
98
99 struct ds_reg_nack {
100 struct ds_msg_tag tag;
101 __u64 handle;
102 __u16 major;
103 };
104
105 struct ds_unreg_req {
106 struct ds_msg_tag tag;
107 __u64 handle;
108 };
109
110 struct ds_unreg_ack {
111 struct ds_msg_tag tag;
112 __u64 handle;
113 };
114
115 struct ds_unreg_nack {
116 struct ds_msg_tag tag;
117 __u64 handle;
118 };
119
120 struct ds_data {
121 struct ds_msg_tag tag;
122 __u64 handle;
123 };
124
125 struct ds_data_nack {
126 struct ds_msg_tag tag;
127 __u64 handle;
128 __u64 result;
129 };
130
131 struct ds_info;
132 struct ds_cap_state {
133 __u64 handle;
134
135 void (*data)(struct ds_info *dp,
136 struct ds_cap_state *cp,
137 void *buf, int len);
138
139 const char *service_id;
140
141 u8 state;
142 #define CAP_STATE_UNKNOWN 0x00
143 #define CAP_STATE_REG_SENT 0x01
144 #define CAP_STATE_REGISTERED 0x02
145 };
146
147 static void md_update_data(struct ds_info *dp, struct ds_cap_state *cp,
148 void *buf, int len);
149 static void domain_shutdown_data(struct ds_info *dp,
150 struct ds_cap_state *cp,
151 void *buf, int len);
152 static void domain_panic_data(struct ds_info *dp,
153 struct ds_cap_state *cp,
154 void *buf, int len);
155 #ifdef CONFIG_HOTPLUG_CPU
156 static void dr_cpu_data(struct ds_info *dp,
157 struct ds_cap_state *cp,
158 void *buf, int len);
159 #endif
160 static void ds_pri_data(struct ds_info *dp,
161 struct ds_cap_state *cp,
162 void *buf, int len);
163 static void ds_var_data(struct ds_info *dp,
164 struct ds_cap_state *cp,
165 void *buf, int len);
166
167 static struct ds_cap_state ds_states_template[] = {
168 {
169 .service_id = "md-update",
170 .data = md_update_data,
171 },
172 {
173 .service_id = "domain-shutdown",
174 .data = domain_shutdown_data,
175 },
176 {
177 .service_id = "domain-panic",
178 .data = domain_panic_data,
179 },
180 #ifdef CONFIG_HOTPLUG_CPU
181 {
182 .service_id = "dr-cpu",
183 .data = dr_cpu_data,
184 },
185 #endif
186 {
187 .service_id = "pri",
188 .data = ds_pri_data,
189 },
190 {
191 .service_id = "var-config",
192 .data = ds_var_data,
193 },
194 {
195 .service_id = "var-config-backup",
196 .data = ds_var_data,
197 },
198 };
199
200 static DEFINE_SPINLOCK(ds_lock);
201
202 struct ds_info {
203 struct ldc_channel *lp;
204 u8 hs_state;
205 #define DS_HS_START 0x01
206 #define DS_HS_DONE 0x02
207
208 u64 id;
209
210 void *rcv_buf;
211 int rcv_buf_len;
212
213 struct ds_cap_state *ds_states;
214 int num_ds_states;
215
216 struct ds_info *next;
217 };
218
219 static struct ds_info *ds_info_list;
220
221 static struct ds_cap_state *find_cap(struct ds_info *dp, u64 handle)
222 {
223 unsigned int index = handle >> 32;
224
225 if (index >= dp->num_ds_states)
226 return NULL;
227 return &dp->ds_states[index];
228 }
229
230 static struct ds_cap_state *find_cap_by_string(struct ds_info *dp,
231 const char *name)
232 {
233 int i;
234
235 for (i = 0; i < dp->num_ds_states; i++) {
236 if (strcmp(dp->ds_states[i].service_id, name))
237 continue;
238
239 return &dp->ds_states[i];
240 }
241 return NULL;
242 }
243
244 static int __ds_send(struct ldc_channel *lp, void *data, int len)
245 {
246 int err, limit = 1000;
247
248 err = -EINVAL;
249 while (limit-- > 0) {
250 err = ldc_write(lp, data, len);
251 if (!err || (err != -EAGAIN))
252 break;
253 udelay(1);
254 }
255
256 return err;
257 }
258
259 static int ds_send(struct ldc_channel *lp, void *data, int len)
260 {
261 unsigned long flags;
262 int err;
263
264 spin_lock_irqsave(&ds_lock, flags);
265 err = __ds_send(lp, data, len);
266 spin_unlock_irqrestore(&ds_lock, flags);
267
268 return err;
269 }
270
271 struct ds_md_update_req {
272 __u64 req_num;
273 };
274
275 struct ds_md_update_res {
276 __u64 req_num;
277 __u32 result;
278 };
279
280 static void md_update_data(struct ds_info *dp,
281 struct ds_cap_state *cp,
282 void *buf, int len)
283 {
284 struct ldc_channel *lp = dp->lp;
285 struct ds_data *dpkt = buf;
286 struct ds_md_update_req *rp;
287 struct {
288 struct ds_data data;
289 struct ds_md_update_res res;
290 } pkt;
291
292 rp = (struct ds_md_update_req *) (dpkt + 1);
293
294 printk(KERN_INFO "ds-%llu: Machine description update.\n", dp->id);
295
296 mdesc_update();
297
298 memset(&pkt, 0, sizeof(pkt));
299 pkt.data.tag.type = DS_DATA;
300 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
301 pkt.data.handle = cp->handle;
302 pkt.res.req_num = rp->req_num;
303 pkt.res.result = DS_OK;
304
305 ds_send(lp, &pkt, sizeof(pkt));
306 }
307
308 struct ds_shutdown_req {
309 __u64 req_num;
310 __u32 ms_delay;
311 };
312
313 struct ds_shutdown_res {
314 __u64 req_num;
315 __u32 result;
316 char reason[1];
317 };
318
319 static void domain_shutdown_data(struct ds_info *dp,
320 struct ds_cap_state *cp,
321 void *buf, int len)
322 {
323 struct ldc_channel *lp = dp->lp;
324 struct ds_data *dpkt = buf;
325 struct ds_shutdown_req *rp;
326 struct {
327 struct ds_data data;
328 struct ds_shutdown_res res;
329 } pkt;
330
331 rp = (struct ds_shutdown_req *) (dpkt + 1);
332
333 printk(KERN_ALERT "ds-%llu: Shutdown request from "
334 "LDOM manager received.\n", dp->id);
335
336 memset(&pkt, 0, sizeof(pkt));
337 pkt.data.tag.type = DS_DATA;
338 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
339 pkt.data.handle = cp->handle;
340 pkt.res.req_num = rp->req_num;
341 pkt.res.result = DS_OK;
342 pkt.res.reason[0] = 0;
343
344 ds_send(lp, &pkt, sizeof(pkt));
345
346 orderly_poweroff(true);
347 }
348
349 struct ds_panic_req {
350 __u64 req_num;
351 };
352
353 struct ds_panic_res {
354 __u64 req_num;
355 __u32 result;
356 char reason[1];
357 };
358
359 static void domain_panic_data(struct ds_info *dp,
360 struct ds_cap_state *cp,
361 void *buf, int len)
362 {
363 struct ldc_channel *lp = dp->lp;
364 struct ds_data *dpkt = buf;
365 struct ds_panic_req *rp;
366 struct {
367 struct ds_data data;
368 struct ds_panic_res res;
369 } pkt;
370
371 rp = (struct ds_panic_req *) (dpkt + 1);
372
373 printk(KERN_ALERT "ds-%llu: Panic request from "
374 "LDOM manager received.\n", dp->id);
375
376 memset(&pkt, 0, sizeof(pkt));
377 pkt.data.tag.type = DS_DATA;
378 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
379 pkt.data.handle = cp->handle;
380 pkt.res.req_num = rp->req_num;
381 pkt.res.result = DS_OK;
382 pkt.res.reason[0] = 0;
383
384 ds_send(lp, &pkt, sizeof(pkt));
385
386 panic("PANIC requested by LDOM manager.");
387 }
388
389 #ifdef CONFIG_HOTPLUG_CPU
390 struct dr_cpu_tag {
391 __u64 req_num;
392 __u32 type;
393 #define DR_CPU_CONFIGURE 0x43
394 #define DR_CPU_UNCONFIGURE 0x55
395 #define DR_CPU_FORCE_UNCONFIGURE 0x46
396 #define DR_CPU_STATUS 0x53
397
398 /* Responses */
399 #define DR_CPU_OK 0x6f
400 #define DR_CPU_ERROR 0x65
401
402 __u32 num_records;
403 };
404
405 struct dr_cpu_resp_entry {
406 __u32 cpu;
407 __u32 result;
408 #define DR_CPU_RES_OK 0x00
409 #define DR_CPU_RES_FAILURE 0x01
410 #define DR_CPU_RES_BLOCKED 0x02
411 #define DR_CPU_RES_CPU_NOT_RESPONDING 0x03
412 #define DR_CPU_RES_NOT_IN_MD 0x04
413
414 __u32 stat;
415 #define DR_CPU_STAT_NOT_PRESENT 0x00
416 #define DR_CPU_STAT_UNCONFIGURED 0x01
417 #define DR_CPU_STAT_CONFIGURED 0x02
418
419 __u32 str_off;
420 };
421
422 static void __dr_cpu_send_error(struct ds_info *dp,
423 struct ds_cap_state *cp,
424 struct ds_data *data)
425 {
426 struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
427 struct {
428 struct ds_data data;
429 struct dr_cpu_tag tag;
430 } pkt;
431 int msg_len;
432
433 memset(&pkt, 0, sizeof(pkt));
434 pkt.data.tag.type = DS_DATA;
435 pkt.data.handle = cp->handle;
436 pkt.tag.req_num = tag->req_num;
437 pkt.tag.type = DR_CPU_ERROR;
438 pkt.tag.num_records = 0;
439
440 msg_len = (sizeof(struct ds_data) +
441 sizeof(struct dr_cpu_tag));
442
443 pkt.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
444
445 __ds_send(dp->lp, &pkt, msg_len);
446 }
447
448 static void dr_cpu_send_error(struct ds_info *dp,
449 struct ds_cap_state *cp,
450 struct ds_data *data)
451 {
452 unsigned long flags;
453
454 spin_lock_irqsave(&ds_lock, flags);
455 __dr_cpu_send_error(dp, cp, data);
456 spin_unlock_irqrestore(&ds_lock, flags);
457 }
458
459 #define CPU_SENTINEL 0xffffffff
460
461 static void purge_dups(u32 *list, u32 num_ents)
462 {
463 unsigned int i;
464
465 for (i = 0; i < num_ents; i++) {
466 u32 cpu = list[i];
467 unsigned int j;
468
469 if (cpu == CPU_SENTINEL)
470 continue;
471
472 for (j = i + 1; j < num_ents; j++) {
473 if (list[j] == cpu)
474 list[j] = CPU_SENTINEL;
475 }
476 }
477 }
478
479 static int dr_cpu_size_response(int ncpus)
480 {
481 return (sizeof(struct ds_data) +
482 sizeof(struct dr_cpu_tag) +
483 (sizeof(struct dr_cpu_resp_entry) * ncpus));
484 }
485
486 static void dr_cpu_init_response(struct ds_data *resp, u64 req_num,
487 u64 handle, int resp_len, int ncpus,
488 cpumask_t *mask, u32 default_stat)
489 {
490 struct dr_cpu_resp_entry *ent;
491 struct dr_cpu_tag *tag;
492 int i, cpu;
493
494 tag = (struct dr_cpu_tag *) (resp + 1);
495 ent = (struct dr_cpu_resp_entry *) (tag + 1);
496
497 resp->tag.type = DS_DATA;
498 resp->tag.len = resp_len - sizeof(struct ds_msg_tag);
499 resp->handle = handle;
500 tag->req_num = req_num;
501 tag->type = DR_CPU_OK;
502 tag->num_records = ncpus;
503
504 i = 0;
505 for_each_cpu(cpu, mask) {
506 ent[i].cpu = cpu;
507 ent[i].result = DR_CPU_RES_OK;
508 ent[i].stat = default_stat;
509 i++;
510 }
511 BUG_ON(i != ncpus);
512 }
513
514 static void dr_cpu_mark(struct ds_data *resp, int cpu, int ncpus,
515 u32 res, u32 stat)
516 {
517 struct dr_cpu_resp_entry *ent;
518 struct dr_cpu_tag *tag;
519 int i;
520
521 tag = (struct dr_cpu_tag *) (resp + 1);
522 ent = (struct dr_cpu_resp_entry *) (tag + 1);
523
524 for (i = 0; i < ncpus; i++) {
525 if (ent[i].cpu != cpu)
526 continue;
527 ent[i].result = res;
528 ent[i].stat = stat;
529 break;
530 }
531 }
532
533 static int dr_cpu_configure(struct ds_info *dp, struct ds_cap_state *cp,
534 u64 req_num, cpumask_t *mask)
535 {
536 struct ds_data *resp;
537 int resp_len, ncpus, cpu;
538 unsigned long flags;
539
540 ncpus = cpumask_weight(mask);
541 resp_len = dr_cpu_size_response(ncpus);
542 resp = kzalloc(resp_len, GFP_KERNEL);
543 if (!resp)
544 return -ENOMEM;
545
546 dr_cpu_init_response(resp, req_num, cp->handle,
547 resp_len, ncpus, mask,
548 DR_CPU_STAT_CONFIGURED);
549
550 mdesc_populate_present_mask(mask);
551 mdesc_fill_in_cpu_data(mask);
552
553 for_each_cpu(cpu, mask) {
554 int err;
555
556 printk(KERN_INFO "ds-%llu: Starting cpu %d...\n",
557 dp->id, cpu);
558 err = add_cpu(cpu);
559 if (err) {
560 __u32 res = DR_CPU_RES_FAILURE;
561 __u32 stat = DR_CPU_STAT_UNCONFIGURED;
562
563 if (!cpu_present(cpu)) {
564 /* CPU not present in MD */
565 res = DR_CPU_RES_NOT_IN_MD;
566 stat = DR_CPU_STAT_NOT_PRESENT;
567 } else if (err == -ENODEV) {
568 /* CPU did not call in successfully */
569 res = DR_CPU_RES_CPU_NOT_RESPONDING;
570 }
571
572 printk(KERN_INFO "ds-%llu: CPU startup failed err=%d\n",
573 dp->id, err);
574 dr_cpu_mark(resp, cpu, ncpus, res, stat);
575 }
576 }
577
578 spin_lock_irqsave(&ds_lock, flags);
579 __ds_send(dp->lp, resp, resp_len);
580 spin_unlock_irqrestore(&ds_lock, flags);
581
582 kfree(resp);
583
584 /* Redistribute IRQs, taking into account the new cpus. */
585 fixup_irqs();
586
587 return 0;
588 }
589
590 static int dr_cpu_unconfigure(struct ds_info *dp,
591 struct ds_cap_state *cp,
592 u64 req_num,
593 cpumask_t *mask)
594 {
595 struct ds_data *resp;
596 int resp_len, ncpus, cpu;
597 unsigned long flags;
598
599 ncpus = cpumask_weight(mask);
600 resp_len = dr_cpu_size_response(ncpus);
601 resp = kzalloc(resp_len, GFP_KERNEL);
602 if (!resp)
603 return -ENOMEM;
604
605 dr_cpu_init_response(resp, req_num, cp->handle,
606 resp_len, ncpus, mask,
607 DR_CPU_STAT_UNCONFIGURED);
608
609 for_each_cpu(cpu, mask) {
610 int err;
611
612 printk(KERN_INFO "ds-%llu: Shutting down cpu %d...\n",
613 dp->id, cpu);
614 err = remove_cpu(cpu);
615 if (err)
616 dr_cpu_mark(resp, cpu, ncpus,
617 DR_CPU_RES_FAILURE,
618 DR_CPU_STAT_CONFIGURED);
619 }
620
621 spin_lock_irqsave(&ds_lock, flags);
622 __ds_send(dp->lp, resp, resp_len);
623 spin_unlock_irqrestore(&ds_lock, flags);
624
625 kfree(resp);
626
627 return 0;
628 }
629
630 static void dr_cpu_data(struct ds_info *dp, struct ds_cap_state *cp, void *buf,
631 int len)
632 {
633 struct ds_data *data = buf;
634 struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
635 u32 *cpu_list = (u32 *) (tag + 1);
636 u64 req_num = tag->req_num;
637 cpumask_t mask;
638 unsigned int i;
639 int err;
640
641 switch (tag->type) {
642 case DR_CPU_CONFIGURE:
643 case DR_CPU_UNCONFIGURE:
644 case DR_CPU_FORCE_UNCONFIGURE:
645 break;
646
647 default:
648 dr_cpu_send_error(dp, cp, data);
649 return;
650 }
651
652 purge_dups(cpu_list, tag->num_records);
653
654 cpumask_clear(&mask);
655 for (i = 0; i < tag->num_records; i++) {
656 if (cpu_list[i] == CPU_SENTINEL)
657 continue;
658
659 if (cpu_list[i] < nr_cpu_ids)
660 cpumask_set_cpu(cpu_list[i], &mask);
661 }
662
663 if (tag->type == DR_CPU_CONFIGURE)
664 err = dr_cpu_configure(dp, cp, req_num, &mask);
665 else
666 err = dr_cpu_unconfigure(dp, cp, req_num, &mask);
667
668 if (err)
669 dr_cpu_send_error(dp, cp, data);
670 }
671 #endif /* CONFIG_HOTPLUG_CPU */
672
673 struct ds_pri_msg {
674 __u64 req_num;
675 __u64 type;
676 #define DS_PRI_REQUEST 0x00
677 #define DS_PRI_DATA 0x01
678 #define DS_PRI_UPDATE 0x02
679 };
680
681 static void ds_pri_data(struct ds_info *dp,
682 struct ds_cap_state *cp,
683 void *buf, int len)
684 {
685 struct ds_data *dpkt = buf;
686 struct ds_pri_msg *rp;
687
688 rp = (struct ds_pri_msg *) (dpkt + 1);
689
690 printk(KERN_INFO "ds-%llu: PRI REQ [%llx:%llx], len=%d\n",
691 dp->id, rp->req_num, rp->type, len);
692 }
693
694 struct ds_var_hdr {
695 __u32 type;
696 #define DS_VAR_SET_REQ 0x00
697 #define DS_VAR_DELETE_REQ 0x01
698 #define DS_VAR_SET_RESP 0x02
699 #define DS_VAR_DELETE_RESP 0x03
700 };
701
702 struct ds_var_set_msg {
703 struct ds_var_hdr hdr;
704 char name_and_value[];
705 };
706
707 struct ds_var_delete_msg {
708 struct ds_var_hdr hdr;
709 char name[];
710 };
711
712 struct ds_var_resp {
713 struct ds_var_hdr hdr;
714 __u32 result;
715 #define DS_VAR_SUCCESS 0x00
716 #define DS_VAR_NO_SPACE 0x01
717 #define DS_VAR_INVALID_VAR 0x02
718 #define DS_VAR_INVALID_VAL 0x03
719 #define DS_VAR_NOT_PRESENT 0x04
720 };
721
722 static DEFINE_MUTEX(ds_var_mutex);
723 static int ds_var_doorbell;
724 static int ds_var_response;
725
726 static void ds_var_data(struct ds_info *dp,
727 struct ds_cap_state *cp,
728 void *buf, int len)
729 {
730 struct ds_data *dpkt = buf;
731 struct ds_var_resp *rp;
732
733 rp = (struct ds_var_resp *) (dpkt + 1);
734
735 if (rp->hdr.type != DS_VAR_SET_RESP &&
736 rp->hdr.type != DS_VAR_DELETE_RESP)
737 return;
738
739 ds_var_response = rp->result;
740 wmb();
741 ds_var_doorbell = 1;
742 }
743
744 void ldom_set_var(const char *var, const char *value)
745 {
746 struct ds_cap_state *cp;
747 struct ds_info *dp;
748 unsigned long flags;
749
750 spin_lock_irqsave(&ds_lock, flags);
751 cp = NULL;
752 for (dp = ds_info_list; dp; dp = dp->next) {
753 struct ds_cap_state *tmp;
754
755 tmp = find_cap_by_string(dp, "var-config");
756 if (tmp && tmp->state == CAP_STATE_REGISTERED) {
757 cp = tmp;
758 break;
759 }
760 }
761 if (!cp) {
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-backup");
766 if (tmp && tmp->state == CAP_STATE_REGISTERED) {
767 cp = tmp;
768 break;
769 }
770 }
771 }
772 spin_unlock_irqrestore(&ds_lock, flags);
773
774 if (cp) {
775 union {
776 struct {
777 struct ds_data data;
778 struct ds_var_set_msg msg;
779 } header;
780 char all[512];
781 } pkt;
782 char *base, *p;
783 int msg_len, loops;
784
785 if (strlen(var) + strlen(value) + 2 >
786 sizeof(pkt) - sizeof(pkt.header)) {
787 printk(KERN_ERR PFX
788 "contents length: %zu, which more than max: %lu,"
789 "so could not set (%s) variable to (%s).\n",
790 strlen(var) + strlen(value) + 2,
791 sizeof(pkt) - sizeof(pkt.header), var, value);
792 return;
793 }
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-%llu: 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 static char full_boot_str[256] __attribute__((aligned(32)));
844 static int reboot_data_supported;
845
846 void ldom_reboot(const char *boot_command)
847 {
848 /* Don't bother with any of this if the boot_command
849 * is empty.
850 */
851 if (boot_command && strlen(boot_command)) {
852 unsigned long len;
853
854 snprintf(full_boot_str, sizeof(full_boot_str), "boot %s",
855 boot_command);
856 len = strlen(full_boot_str);
857
858 if (reboot_data_supported) {
859 unsigned long ra = kimage_addr_to_ra(full_boot_str);
860 unsigned long hv_ret;
861
862 hv_ret = sun4v_reboot_data_set(ra, len);
863 if (hv_ret != HV_EOK)
864 pr_err("SUN4V: Unable to set reboot data "
865 "hv_ret=%lu\n", hv_ret);
866 } else {
867 ldom_set_var("reboot-command", full_boot_str);
868 }
869 }
870 sun4v_mach_sir();
871 }
872
873 void ldom_power_off(void)
874 {
875 sun4v_mach_exit(0);
876 }
877
878 static void ds_conn_reset(struct ds_info *dp)
879 {
880 printk(KERN_ERR "ds-%llu: ds_conn_reset() from %ps\n",
881 dp->id, __builtin_return_address(0));
882 }
883
884 static int register_services(struct ds_info *dp)
885 {
886 struct ldc_channel *lp = dp->lp;
887 int i;
888
889 for (i = 0; i < dp->num_ds_states; i++) {
890 struct {
891 struct ds_reg_req req;
892 u8 id_buf[256];
893 } pbuf;
894 struct ds_cap_state *cp = &dp->ds_states[i];
895 int err, msg_len;
896 u64 new_count;
897
898 if (cp->state == CAP_STATE_REGISTERED)
899 continue;
900
901 new_count = sched_clock() & 0xffffffff;
902 cp->handle = ((u64) i << 32) | new_count;
903
904 msg_len = (sizeof(struct ds_reg_req) +
905 strlen(cp->service_id));
906
907 memset(&pbuf, 0, sizeof(pbuf));
908 pbuf.req.tag.type = DS_REG_REQ;
909 pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag));
910 pbuf.req.handle = cp->handle;
911 pbuf.req.major = 1;
912 pbuf.req.minor = 0;
913 strcpy(pbuf.id_buf, cp->service_id);
914
915 err = __ds_send(lp, &pbuf, msg_len);
916 if (err > 0)
917 cp->state = CAP_STATE_REG_SENT;
918 }
919 return 0;
920 }
921
922 static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt)
923 {
924
925 if (dp->hs_state == DS_HS_START) {
926 if (pkt->type != DS_INIT_ACK)
927 goto conn_reset;
928
929 dp->hs_state = DS_HS_DONE;
930
931 return register_services(dp);
932 }
933
934 if (dp->hs_state != DS_HS_DONE)
935 goto conn_reset;
936
937 if (pkt->type == DS_REG_ACK) {
938 struct ds_reg_ack *ap = (struct ds_reg_ack *) pkt;
939 struct ds_cap_state *cp = find_cap(dp, ap->handle);
940
941 if (!cp) {
942 printk(KERN_ERR "ds-%llu: REG ACK for unknown "
943 "handle %llx\n", dp->id, ap->handle);
944 return 0;
945 }
946 printk(KERN_INFO "ds-%llu: Registered %s service.\n",
947 dp->id, cp->service_id);
948 cp->state = CAP_STATE_REGISTERED;
949 } else if (pkt->type == DS_REG_NACK) {
950 struct ds_reg_nack *np = (struct ds_reg_nack *) pkt;
951 struct ds_cap_state *cp = find_cap(dp, np->handle);
952
953 if (!cp) {
954 printk(KERN_ERR "ds-%llu: REG NACK for "
955 "unknown handle %llx\n",
956 dp->id, np->handle);
957 return 0;
958 }
959 cp->state = CAP_STATE_UNKNOWN;
960 }
961
962 return 0;
963
964 conn_reset:
965 ds_conn_reset(dp);
966 return -ECONNRESET;
967 }
968
969 static void __send_ds_nack(struct ds_info *dp, u64 handle)
970 {
971 struct ds_data_nack nack = {
972 .tag = {
973 .type = DS_NACK,
974 .len = (sizeof(struct ds_data_nack) -
975 sizeof(struct ds_msg_tag)),
976 },
977 .handle = handle,
978 .result = DS_INV_HDL,
979 };
980
981 __ds_send(dp->lp, &nack, sizeof(nack));
982 }
983
984 static LIST_HEAD(ds_work_list);
985 static DECLARE_WAIT_QUEUE_HEAD(ds_wait);
986
987 struct ds_queue_entry {
988 struct list_head list;
989 struct ds_info *dp;
990 int req_len;
991 int __pad;
992 u64 req[];
993 };
994
995 static void process_ds_work(void)
996 {
997 struct ds_queue_entry *qp, *tmp;
998 unsigned long flags;
999 LIST_HEAD(todo);
1000
1001 spin_lock_irqsave(&ds_lock, flags);
1002 list_splice_init(&ds_work_list, &todo);
1003 spin_unlock_irqrestore(&ds_lock, flags);
1004
1005 list_for_each_entry_safe(qp, tmp, &todo, list) {
1006 struct ds_data *dpkt = (struct ds_data *) qp->req;
1007 struct ds_info *dp = qp->dp;
1008 struct ds_cap_state *cp = find_cap(dp, dpkt->handle);
1009 int req_len = qp->req_len;
1010
1011 if (!cp) {
1012 printk(KERN_ERR "ds-%llu: Data for unknown "
1013 "handle %llu\n",
1014 dp->id, dpkt->handle);
1015
1016 spin_lock_irqsave(&ds_lock, flags);
1017 __send_ds_nack(dp, dpkt->handle);
1018 spin_unlock_irqrestore(&ds_lock, flags);
1019 } else {
1020 cp->data(dp, cp, dpkt, req_len);
1021 }
1022
1023 list_del(&qp->list);
1024 kfree(qp);
1025 }
1026 }
1027
1028 static int ds_thread(void *__unused)
1029 {
1030 DEFINE_WAIT(wait);
1031
1032 while (1) {
1033 prepare_to_wait(&ds_wait, &wait, TASK_INTERRUPTIBLE);
1034 if (list_empty(&ds_work_list))
1035 schedule();
1036 finish_wait(&ds_wait, &wait);
1037
1038 if (kthread_should_stop())
1039 break;
1040
1041 process_ds_work();
1042 }
1043
1044 return 0;
1045 }
1046
1047 static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len)
1048 {
1049 struct ds_data *dpkt = (struct ds_data *) pkt;
1050 struct ds_queue_entry *qp;
1051
1052 qp = kmalloc(sizeof(struct ds_queue_entry) + len, GFP_ATOMIC);
1053 if (!qp) {
1054 __send_ds_nack(dp, dpkt->handle);
1055 } else {
1056 qp->dp = dp;
1057 memcpy(&qp->req, pkt, len);
1058 list_add_tail(&qp->list, &ds_work_list);
1059 wake_up(&ds_wait);
1060 }
1061 return 0;
1062 }
1063
1064 static void ds_up(struct ds_info *dp)
1065 {
1066 struct ldc_channel *lp = dp->lp;
1067 struct ds_ver_req req;
1068 int err;
1069
1070 req.tag.type = DS_INIT_REQ;
1071 req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag);
1072 req.ver.major = 1;
1073 req.ver.minor = 0;
1074
1075 err = __ds_send(lp, &req, sizeof(req));
1076 if (err > 0)
1077 dp->hs_state = DS_HS_START;
1078 }
1079
1080 static void ds_reset(struct ds_info *dp)
1081 {
1082 int i;
1083
1084 dp->hs_state = 0;
1085
1086 for (i = 0; i < dp->num_ds_states; i++) {
1087 struct ds_cap_state *cp = &dp->ds_states[i];
1088
1089 cp->state = CAP_STATE_UNKNOWN;
1090 }
1091 }
1092
1093 static void ds_event(void *arg, int event)
1094 {
1095 struct ds_info *dp = arg;
1096 struct ldc_channel *lp = dp->lp;
1097 unsigned long flags;
1098 int err;
1099
1100 spin_lock_irqsave(&ds_lock, flags);
1101
1102 if (event == LDC_EVENT_UP) {
1103 ds_up(dp);
1104 spin_unlock_irqrestore(&ds_lock, flags);
1105 return;
1106 }
1107
1108 if (event == LDC_EVENT_RESET) {
1109 ds_reset(dp);
1110 spin_unlock_irqrestore(&ds_lock, flags);
1111 return;
1112 }
1113
1114 if (event != LDC_EVENT_DATA_READY) {
1115 printk(KERN_WARNING "ds-%llu: Unexpected LDC event %d\n",
1116 dp->id, event);
1117 spin_unlock_irqrestore(&ds_lock, flags);
1118 return;
1119 }
1120
1121 err = 0;
1122 while (1) {
1123 struct ds_msg_tag *tag;
1124
1125 err = ldc_read(lp, dp->rcv_buf, sizeof(*tag));
1126
1127 if (unlikely(err < 0)) {
1128 if (err == -ECONNRESET)
1129 ds_conn_reset(dp);
1130 break;
1131 }
1132 if (err == 0)
1133 break;
1134
1135 tag = dp->rcv_buf;
1136 err = ldc_read(lp, tag + 1, tag->len);
1137
1138 if (unlikely(err < 0)) {
1139 if (err == -ECONNRESET)
1140 ds_conn_reset(dp);
1141 break;
1142 }
1143 if (err < tag->len)
1144 break;
1145
1146 if (tag->type < DS_DATA)
1147 err = ds_handshake(dp, dp->rcv_buf);
1148 else
1149 err = ds_data(dp, dp->rcv_buf,
1150 sizeof(*tag) + err);
1151 if (err == -ECONNRESET)
1152 break;
1153 }
1154
1155 spin_unlock_irqrestore(&ds_lock, flags);
1156 }
1157
1158 static int ds_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1159 {
1160 static int ds_version_printed;
1161 struct ldc_channel_config ds_cfg = {
1162 .event = ds_event,
1163 .mtu = 4096,
1164 .mode = LDC_MODE_STREAM,
1165 };
1166 struct mdesc_handle *hp;
1167 struct ldc_channel *lp;
1168 struct ds_info *dp;
1169 const u64 *val;
1170 int err, i;
1171
1172 if (ds_version_printed++ == 0)
1173 printk(KERN_INFO "%s", version);
1174
1175 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1176 err = -ENOMEM;
1177 if (!dp)
1178 goto out_err;
1179
1180 hp = mdesc_grab();
1181 val = mdesc_get_property(hp, vdev->mp, "id", NULL);
1182 if (val)
1183 dp->id = *val;
1184 mdesc_release(hp);
1185
1186 dp->rcv_buf = kzalloc(4096, GFP_KERNEL);
1187 if (!dp->rcv_buf)
1188 goto out_free_dp;
1189
1190 dp->rcv_buf_len = 4096;
1191
1192 dp->ds_states = kmemdup(ds_states_template,
1193 sizeof(ds_states_template), GFP_KERNEL);
1194 if (!dp->ds_states)
1195 goto out_free_rcv_buf;
1196
1197 dp->num_ds_states = ARRAY_SIZE(ds_states_template);
1198
1199 for (i = 0; i < dp->num_ds_states; i++)
1200 dp->ds_states[i].handle = ((u64)i << 32);
1201
1202 ds_cfg.tx_irq = vdev->tx_irq;
1203 ds_cfg.rx_irq = vdev->rx_irq;
1204
1205 lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp, "DS");
1206 if (IS_ERR(lp)) {
1207 err = PTR_ERR(lp);
1208 goto out_free_ds_states;
1209 }
1210 dp->lp = lp;
1211
1212 err = ldc_bind(lp);
1213 if (err)
1214 goto out_free_ldc;
1215
1216 spin_lock_irq(&ds_lock);
1217 dp->next = ds_info_list;
1218 ds_info_list = dp;
1219 spin_unlock_irq(&ds_lock);
1220
1221 return err;
1222
1223 out_free_ldc:
1224 ldc_free(dp->lp);
1225
1226 out_free_ds_states:
1227 kfree(dp->ds_states);
1228
1229 out_free_rcv_buf:
1230 kfree(dp->rcv_buf);
1231
1232 out_free_dp:
1233 kfree(dp);
1234
1235 out_err:
1236 return err;
1237 }
1238
1239 static const struct vio_device_id ds_match[] = {
1240 {
1241 .type = "domain-services-port",
1242 },
1243 {},
1244 };
1245
1246 static struct vio_driver ds_driver = {
1247 .id_table = ds_match,
1248 .probe = ds_probe,
1249 .name = "ds",
1250 };
1251
1252 static int __init ds_init(void)
1253 {
1254 unsigned long hv_ret, major, minor;
1255
1256 if (tlb_type == hypervisor) {
1257 hv_ret = sun4v_get_version(HV_GRP_REBOOT_DATA, &major, &minor);
1258 if (hv_ret == HV_EOK) {
1259 pr_info("SUN4V: Reboot data supported (maj=%lu,min=%lu).\n",
1260 major, minor);
1261 reboot_data_supported = 1;
1262 }
1263 }
1264 kthread_run(ds_thread, NULL, "kldomd");
1265
1266 return vio_register_driver(&ds_driver);
1267 }
1268
1269 fs_initcall(ds_init);
1270
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