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