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[SPARC64]: Improve VIO device naming further.
[linux-2.6-block.git] / arch / sparc64 / kernel / ds.c
CommitLineData
e450992d
DM		 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>
b3e13fbe 14#include <linux/mutex.h>
bd0e11ff 15#include <linux/kthread.h>
a3761780 16#include <linux/reboot.h>
4f0234f4 17#include <linux/cpu.h>
e450992d
DM		 18
19#include <asm/ldc.h>
20#include <asm/vio.h>
43fdf274 21#include <asm/mdesc.h>
4f0234f4 22#include <asm/head.h>
e0204409 23#include <asm/irq.h>
e450992d
DM		 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
30static char version[] __devinitdata =
31 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
32MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
33MODULE_DESCRIPTION("Sun LDOM domain services driver");
34MODULE_LICENSE("GPL");
35MODULE_VERSION(DRV_MODULE_VERSION);
36
37struct 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
61struct ds_version {
62 __u16 major;
63 __u16 minor;
64};
65
66struct ds_ver_req {
67 struct ds_msg_tag tag;
68 struct ds_version ver;
69};
70
71struct ds_ver_ack {
72 struct ds_msg_tag tag;
73 __u16 minor;
74};
75
76struct ds_ver_nack {
77 struct ds_msg_tag tag;
78 __u16 major;
79};
80
81struct 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
89struct ds_reg_ack {
90 struct ds_msg_tag tag;
91 __u64 handle;
92 __u16 minor;
93};
94
95struct ds_reg_nack {
96 struct ds_msg_tag tag;
97 __u64 handle;
98 __u16 major;
99};
100
101struct ds_unreg_req {
102 struct ds_msg_tag tag;
103 __u64 handle;
104};
105
106struct ds_unreg_ack {
107 struct ds_msg_tag tag;
108 __u64 handle;
109};
110
111struct ds_unreg_nack {
112 struct ds_msg_tag tag;
113 __u64 handle;
114};
115
116struct ds_data {
117 struct ds_msg_tag tag;
118 __u64 handle;
119};
120
121struct ds_data_nack {
122 struct ds_msg_tag tag;
123 __u64 handle;
124 __u64 result;
125};
126
127struct ds_cap_state {
128 __u64 handle;
129
130 void (*data)(struct ldc_channel *lp,
4f0234f4 131 struct ds_cap_state *cp,
e450992d
DM		 132 void *buf, int len);
133
134 const char *service_id;
135
136 u8 state;
137#define CAP_STATE_UNKNOWN 0x00
138#define CAP_STATE_REG_SENT 0x01
139#define CAP_STATE_REGISTERED 0x02
140};
141
4f0234f4
DM		 142static void md_update_data(struct ldc_channel *lp, struct ds_cap_state *cp,
143 void *buf, int len);
144static void domain_shutdown_data(struct ldc_channel *lp,
145 struct ds_cap_state *cp,
146 void *buf, int len);
147static void domain_panic_data(struct ldc_channel *lp,
148 struct ds_cap_state *cp,
149 void *buf, int len);
b14f5c10 150#ifdef CONFIG_HOTPLUG_CPU
4f0234f4
DM		 151static void dr_cpu_data(struct ldc_channel *lp,
152 struct ds_cap_state *cp,
153 void *buf, int len);
b14f5c10 154#endif
4f0234f4
DM		 155static void ds_pri_data(struct ldc_channel *lp,
156 struct ds_cap_state *cp,
157 void *buf, int len);
158static void ds_var_data(struct ldc_channel *lp,
159 struct ds_cap_state *cp,
160 void *buf, int len);
161
162struct ds_cap_state ds_states[] = {
163 {
164 .service_id = "md-update",
165 .data = md_update_data,
166 },
167 {
168 .service_id = "domain-shutdown",
169 .data = domain_shutdown_data,
170 },
171 {
172 .service_id = "domain-panic",
173 .data = domain_panic_data,
174 },
b14f5c10 175#ifdef CONFIG_HOTPLUG_CPU
4f0234f4
DM		 176 {
177 .service_id = "dr-cpu",
178 .data = dr_cpu_data,
179 },
b14f5c10 180#endif
4f0234f4
DM		 181 {
182 .service_id = "pri",
183 .data = ds_pri_data,
184 },
185 {
186 .service_id = "var-config",
187 .data = ds_var_data,
188 },
189 {
190 .service_id = "var-config-backup",
191 .data = ds_var_data,
192 },
193};
194
195static DEFINE_SPINLOCK(ds_lock);
196
197struct ds_info {
198 struct ldc_channel *lp;
199 u8 hs_state;
200#define DS_HS_START 0x01
201#define DS_HS_DONE 0x02
202
203 void *rcv_buf;
204 int rcv_buf_len;
205};
206
207static struct ds_info *ds_info;
208
209static struct ds_cap_state *find_cap(u64 handle)
210{
211 unsigned int index = handle >> 32;
212
213 if (index >= ARRAY_SIZE(ds_states))
214 return NULL;
215 return &ds_states[index];
216}
217
218static struct ds_cap_state *find_cap_by_string(const char *name)
219{
220 int i;
221
222 for (i = 0; i < ARRAY_SIZE(ds_states); i++) {
223 if (strcmp(ds_states[i].service_id, name))
224 continue;
225
226 return &ds_states[i];
227 }
228 return NULL;
229}
230
778feeb4 231static int __ds_send(struct ldc_channel *lp, void *data, int len)
e450992d
DM		 232{
233 int err, limit = 1000;
234
235 err = -EINVAL;
236 while (limit-- > 0) {
237 err = ldc_write(lp, data, len);
238 if (!err || (err != -EAGAIN))
239 break;
240 udelay(1);
241 }
242
243 return err;
244}
245
778feeb4
DM		 246static int ds_send(struct ldc_channel *lp, void *data, int len)
247{
248 unsigned long flags;
249 int err;
250
251 spin_lock_irqsave(&ds_lock, flags);
252 err = __ds_send(lp, data, len);
253 spin_unlock_irqrestore(&ds_lock, flags);
254
255 return err;
256}
257
e450992d
DM		 258struct ds_md_update_req {
259 __u64 req_num;
260};
261
262struct ds_md_update_res {
263 __u64 req_num;
264 __u32 result;
265};
266
267static void md_update_data(struct ldc_channel *lp,
268 struct ds_cap_state *dp,
269 void *buf, int len)
270{
271 struct ds_data *dpkt = buf;
272 struct ds_md_update_req *rp;
273 struct {
274 struct ds_data data;
275 struct ds_md_update_res res;
276 } pkt;
277
278 rp = (struct ds_md_update_req *) (dpkt + 1);
279
b3e13fbe 280 printk(KERN_INFO PFX "Machine description update.\n");
e450992d 281
778feeb4
DM		 282 mdesc_update();
283
e450992d
DM		 284 memset(&pkt, 0, sizeof(pkt));
285 pkt.data.tag.type = DS_DATA;
286 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
287 pkt.data.handle = dp->handle;
288 pkt.res.req_num = rp->req_num;
289 pkt.res.result = DS_OK;
290
291 ds_send(lp, &pkt, sizeof(pkt));
292}
293
294struct ds_shutdown_req {
295 __u64 req_num;
296 __u32 ms_delay;
297};
298
299struct ds_shutdown_res {
300 __u64 req_num;
301 __u32 result;
302 char reason[1];
303};
304
305static void domain_shutdown_data(struct ldc_channel *lp,
306 struct ds_cap_state *dp,
307 void *buf, int len)
308{
309 struct ds_data *dpkt = buf;
310 struct ds_shutdown_req *rp;
311 struct {
312 struct ds_data data;
313 struct ds_shutdown_res res;
314 } pkt;
315
316 rp = (struct ds_shutdown_req *) (dpkt + 1);
317
318 printk(KERN_ALERT PFX "Shutdown request from "
319 "LDOM manager received.\n");
320
321 memset(&pkt, 0, sizeof(pkt));
322 pkt.data.tag.type = DS_DATA;
323 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
324 pkt.data.handle = dp->handle;
325 pkt.res.req_num = rp->req_num;
326 pkt.res.result = DS_OK;
327 pkt.res.reason[0] = 0;
328
329 ds_send(lp, &pkt, sizeof(pkt));
330
a3761780 331 orderly_poweroff(true);
e450992d
DM		 332}
333
334struct ds_panic_req {
335 __u64 req_num;
336};
337
338struct ds_panic_res {
339 __u64 req_num;
340 __u32 result;
341 char reason[1];
342};
343
344static void domain_panic_data(struct ldc_channel *lp,
345 struct ds_cap_state *dp,
346 void *buf, int len)
347{
348 struct ds_data *dpkt = buf;
349 struct ds_panic_req *rp;
350 struct {
351 struct ds_data data;
352 struct ds_panic_res res;
353 } pkt;
354
355 rp = (struct ds_panic_req *) (dpkt + 1);
356
b3e13fbe
DM		 357 printk(KERN_ALERT PFX "Panic request from "
358 "LDOM manager received.\n");
e450992d
DM		 359
360 memset(&pkt, 0, sizeof(pkt));
361 pkt.data.tag.type = DS_DATA;
362 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
363 pkt.data.handle = dp->handle;
364 pkt.res.req_num = rp->req_num;
365 pkt.res.result = DS_OK;
366 pkt.res.reason[0] = 0;
367
368 ds_send(lp, &pkt, sizeof(pkt));
369
370 panic("PANIC requested by LDOM manager.");
371}
372
b14f5c10 373#ifdef CONFIG_HOTPLUG_CPU
4f0234f4 374struct dr_cpu_tag {
e450992d
DM		 375 __u64 req_num;
376 __u32 type;
4f0234f4
DM		 377#define DR_CPU_CONFIGURE 0x43
378#define DR_CPU_UNCONFIGURE 0x55
379#define DR_CPU_FORCE_UNCONFIGURE 0x46
380#define DR_CPU_STATUS 0x53
e450992d
DM		 381
382/* Responses */
4f0234f4
DM		 383#define DR_CPU_OK 0x6f
384#define DR_CPU_ERROR 0x65
e450992d
DM		 385
386 __u32 num_records;
387};
388
4f0234f4
DM		 389struct dr_cpu_resp_entry {
390 __u32 cpu;
391 __u32 result;
392#define DR_CPU_RES_OK 0x00
393#define DR_CPU_RES_FAILURE 0x01
394#define DR_CPU_RES_BLOCKED 0x02
395#define DR_CPU_RES_CPU_NOT_RESPONDING 0x03
396#define DR_CPU_RES_NOT_IN_MD 0x04
397
398 __u32 stat;
399#define DR_CPU_STAT_NOT_PRESENT 0x00
400#define DR_CPU_STAT_UNCONFIGURED 0x01
401#define DR_CPU_STAT_CONFIGURED 0x02
402
403 __u32 str_off;
e450992d
DM		 404};
405
4f0234f4
DM		 406static void __dr_cpu_send_error(struct ds_cap_state *cp, struct ds_data *data)
407{
408 struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
409 struct ds_info *dp = ds_info;
410 struct {
411 struct ds_data data;
412 struct dr_cpu_tag tag;
413 } pkt;
414 int msg_len;
415
416 memset(&pkt, 0, sizeof(pkt));
417 pkt.data.tag.type = DS_DATA;
418 pkt.data.handle = cp->handle;
419 pkt.tag.req_num = tag->req_num;
420 pkt.tag.type = DR_CPU_ERROR;
421 pkt.tag.num_records = 0;
422
423 msg_len = (sizeof(struct ds_data) +
424 sizeof(struct dr_cpu_tag));
425
426 pkt.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
427
778feeb4 428 __ds_send(dp->lp, &pkt, msg_len);
4f0234f4
DM		 429}
430
431static void dr_cpu_send_error(struct ds_cap_state *cp, struct ds_data *data)
432{
433 unsigned long flags;
434
435 spin_lock_irqsave(&ds_lock, flags);
436 __dr_cpu_send_error(cp, data);
437 spin_unlock_irqrestore(&ds_lock, flags);
438}
439
440#define CPU_SENTINEL 0xffffffff
441
442static void purge_dups(u32 *list, u32 num_ents)
443{
444 unsigned int i;
445
446 for (i = 0; i < num_ents; i++) {
447 u32 cpu = list[i];
448 unsigned int j;
449
450 if (cpu == CPU_SENTINEL)
451 continue;
452
453 for (j = i + 1; j < num_ents; j++) {
454 if (list[j] == cpu)
455 list[j] = CPU_SENTINEL;
456 }
457 }
458}
459
460static int dr_cpu_size_response(int ncpus)
461{
462 return (sizeof(struct ds_data) +
463 sizeof(struct dr_cpu_tag) +
464 (sizeof(struct dr_cpu_resp_entry) * ncpus));
465}
466
467static void dr_cpu_init_response(struct ds_data *resp, u64 req_num,
468 u64 handle, int resp_len, int ncpus,
469 cpumask_t *mask, u32 default_stat)
470{
471 struct dr_cpu_resp_entry *ent;
472 struct dr_cpu_tag *tag;
473 int i, cpu;
474
475 tag = (struct dr_cpu_tag *) (resp + 1);
476 ent = (struct dr_cpu_resp_entry *) (tag + 1);
477
478 resp->tag.type = DS_DATA;
479 resp->tag.len = resp_len - sizeof(struct ds_msg_tag);
480 resp->handle = handle;
481 tag->req_num = req_num;
482 tag->type = DR_CPU_OK;
483 tag->num_records = ncpus;
484
485 i = 0;
486 for_each_cpu_mask(cpu, *mask) {
487 ent[i].cpu = cpu;
488 ent[i].result = DR_CPU_RES_OK;
489 ent[i].stat = default_stat;
490 i++;
491 }
492 BUG_ON(i != ncpus);
493}
494
495static void dr_cpu_mark(struct ds_data *resp, int cpu, int ncpus,
496 u32 res, u32 stat)
497{
498 struct dr_cpu_resp_entry *ent;
499 struct dr_cpu_tag *tag;
500 int i;
501
502 tag = (struct dr_cpu_tag *) (resp + 1);
503 ent = (struct dr_cpu_resp_entry *) (tag + 1);
504
505 for (i = 0; i < ncpus; i++) {
506 if (ent[i].cpu != cpu)
507 continue;
508 ent[i].result = res;
509 ent[i].stat = stat;
510 break;
511 }
512}
513
514static int dr_cpu_configure(struct ds_cap_state *cp, u64 req_num,
515 cpumask_t *mask)
516{
517 struct ds_data *resp;
518 int resp_len, ncpus, cpu;
519 unsigned long flags;
520
521 ncpus = cpus_weight(*mask);
522 resp_len = dr_cpu_size_response(ncpus);
523 resp = kzalloc(resp_len, GFP_KERNEL);
524 if (!resp)
525 return -ENOMEM;
526
527 dr_cpu_init_response(resp, req_num, cp->handle,
528 resp_len, ncpus, mask,
529 DR_CPU_STAT_CONFIGURED);
530
531 mdesc_fill_in_cpu_data(*mask);
532
533 for_each_cpu_mask(cpu, *mask) {
534 int err;
535
536 printk(KERN_INFO PFX "Starting cpu %d...\n", cpu);
537 err = cpu_up(cpu);
bd0e11ff 538 if (err) {
9918cc2e
DM		 539 __u32 res = DR_CPU_RES_FAILURE;
540 __u32 stat = DR_CPU_STAT_UNCONFIGURED;
541
542 if (!cpu_present(cpu)) {
543 /* CPU not present in MD */
544 res = DR_CPU_RES_NOT_IN_MD;
545 stat = DR_CPU_STAT_NOT_PRESENT;
546 } else if (err == -ENODEV) {
547 /* CPU did not call in successfully */
548 res = DR_CPU_RES_CPU_NOT_RESPONDING;
549 }
550
bd0e11ff
DM		 551 printk(KERN_INFO PFX "CPU startup failed err=%d\n",
552 err);
9918cc2e 553 dr_cpu_mark(resp, cpu, ncpus, res, stat);
bd0e11ff 554 }
4f0234f4
DM		 555 }
556
557 spin_lock_irqsave(&ds_lock, flags);
778feeb4 558 __ds_send(ds_info->lp, resp, resp_len);
4f0234f4
DM		 559 spin_unlock_irqrestore(&ds_lock, flags);
560
561 kfree(resp);
562
e0204409
DM		 563 /* Redistribute IRQs, taking into account the new cpus. */
564 fixup_irqs();
565
4f0234f4
DM		 566 return 0;
567}
568
569static int dr_cpu_unconfigure(struct ds_cap_state *cp, u64 req_num,
570 cpumask_t *mask)
571{
572 struct ds_data *resp;
e0204409
DM		 573 int resp_len, ncpus, cpu;
574 unsigned long flags;
4f0234f4
DM		 575
576 ncpus = cpus_weight(*mask);
577 resp_len = dr_cpu_size_response(ncpus);
578 resp = kzalloc(resp_len, GFP_KERNEL);
579 if (!resp)
580 return -ENOMEM;
581
582 dr_cpu_init_response(resp, req_num, cp->handle,
583 resp_len, ncpus, mask,
584 DR_CPU_STAT_UNCONFIGURED);
585
e0204409
DM		 586 for_each_cpu_mask(cpu, *mask) {
587 int err;
588
589 printk(KERN_INFO PFX "CPU[%d]: Shutting down cpu %d...\n",
590 smp_processor_id(), cpu);
591 err = cpu_down(cpu);
592 if (err)
593 dr_cpu_mark(resp, cpu, ncpus,
594 DR_CPU_RES_FAILURE,
595 DR_CPU_STAT_CONFIGURED);
596 }
597
598 spin_lock_irqsave(&ds_lock, flags);
778feeb4 599 __ds_send(ds_info->lp, resp, resp_len);
e0204409
DM		 600 spin_unlock_irqrestore(&ds_lock, flags);
601
4f0234f4
DM		 602 kfree(resp);
603
e0204409 604 return 0;
4f0234f4
DM		 605}
606
778feeb4
DM		 607static void dr_cpu_data(struct ldc_channel *lp,
608 struct ds_cap_state *cp,
609 void *buf, int len)
4f0234f4 610{
778feeb4
DM		 611 struct ds_data *data = buf;
612 struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
613 u32 *cpu_list = (u32 *) (tag + 1);
614 u64 req_num = tag->req_num;
4f0234f4 615 cpumask_t mask;
778feeb4
DM		 616 unsigned int i;
617 int err;
4f0234f4 618
778feeb4
DM		 619 switch (tag->type) {
620 case DR_CPU_CONFIGURE:
621 case DR_CPU_UNCONFIGURE:
622 case DR_CPU_FORCE_UNCONFIGURE:
623 break;
4f0234f4 624
778feeb4
DM		 625 default:
626 dr_cpu_send_error(cp, data);
627 return;
4f0234f4 628 }
4f0234f4 629
778feeb4 630 purge_dups(cpu_list, tag->num_records);
bd0e11ff 631
778feeb4
DM		 632 cpus_clear(mask);
633 for (i = 0; i < tag->num_records; i++) {
634 if (cpu_list[i] == CPU_SENTINEL)
635 continue;
bd0e11ff 636
778feeb4
DM		 637 if (cpu_list[i] < NR_CPUS)
638 cpu_set(cpu_list[i], mask);
bd0e11ff
DM		 639 }
640
778feeb4
DM		 641 if (tag->type == DR_CPU_CONFIGURE)
642 err = dr_cpu_configure(cp, req_num, &mask);
643 else
644 err = dr_cpu_unconfigure(cp, req_num, &mask);
e450992d 645
778feeb4
DM		 646 if (err)
647 dr_cpu_send_error(cp, data);
e450992d 648}
778feeb4 649#endif /* CONFIG_HOTPLUG_CPU */
e450992d
DM		 650
651struct ds_pri_msg {
652 __u64 req_num;
653 __u64 type;
654#define DS_PRI_REQUEST 0x00
655#define DS_PRI_DATA 0x01
656#define DS_PRI_UPDATE 0x02
657};
658
659static void ds_pri_data(struct ldc_channel *lp,
660 struct ds_cap_state *dp,
661 void *buf, int len)
662{
663 struct ds_data *dpkt = buf;
664 struct ds_pri_msg *rp;
665
666 rp = (struct ds_pri_msg *) (dpkt + 1);
667
b3e13fbe 668 printk(KERN_INFO PFX "PRI REQ [%lx:%lx], len=%d\n",
e450992d
DM		 669 rp->req_num, rp->type, len);
670}
671
b3e13fbe
DM		 672struct ds_var_hdr {
673 __u32 type;
674#define DS_VAR_SET_REQ 0x00
675#define DS_VAR_DELETE_REQ 0x01
676#define DS_VAR_SET_RESP 0x02
677#define DS_VAR_DELETE_RESP 0x03
678};
679
680struct ds_var_set_msg {
681 struct ds_var_hdr hdr;
682 char name_and_value[0];
683};
684
685struct ds_var_delete_msg {
686 struct ds_var_hdr hdr;
687 char name[0];
688};
689
690struct ds_var_resp {
691 struct ds_var_hdr hdr;
692 __u32 result;
693#define DS_VAR_SUCCESS 0x00
694#define DS_VAR_NO_SPACE 0x01
695#define DS_VAR_INVALID_VAR 0x02
696#define DS_VAR_INVALID_VAL 0x03
697#define DS_VAR_NOT_PRESENT 0x04
698};
699
700static DEFINE_MUTEX(ds_var_mutex);
701static int ds_var_doorbell;
702static int ds_var_response;
703
704static void ds_var_data(struct ldc_channel *lp,
705 struct ds_cap_state *dp,
706 void *buf, int len)
707{
708 struct ds_data *dpkt = buf;
709 struct ds_var_resp *rp;
710
711 rp = (struct ds_var_resp *) (dpkt + 1);
712
713 if (rp->hdr.type != DS_VAR_SET_RESP &&
714 rp->hdr.type != DS_VAR_DELETE_RESP)
715 return;
716
717 ds_var_response = rp->result;
718 wmb();
719 ds_var_doorbell = 1;
720}
721
b3e13fbe
DM		 722void ldom_set_var(const char *var, const char *value)
723{
724 struct ds_info *dp = ds_info;
725 struct ds_cap_state *cp;
726
727 cp = find_cap_by_string("var-config");
728 if (cp->state != CAP_STATE_REGISTERED)
729 cp = find_cap_by_string("var-config-backup");
730
731 if (cp->state == CAP_STATE_REGISTERED) {
732 union {
733 struct {
734 struct ds_data data;
735 struct ds_var_set_msg msg;
736 } header;
737 char all[512];
738 } pkt;
739 unsigned long flags;
740 char *base, *p;
741 int msg_len, loops;
742
743 memset(&pkt, 0, sizeof(pkt));
744 pkt.header.data.tag.type = DS_DATA;
745 pkt.header.data.handle = cp->handle;
746 pkt.header.msg.hdr.type = DS_VAR_SET_REQ;
747 base = p = &pkt.header.msg.name_and_value[0];
748 strcpy(p, var);
749 p += strlen(var) + 1;
750 strcpy(p, value);
751 p += strlen(value) + 1;
752
753 msg_len = (sizeof(struct ds_data) +
4f0234f4
DM		 754 sizeof(struct ds_var_set_msg) +
755 (p - base));
b3e13fbe
DM		 756 msg_len = (msg_len + 3) & ~3;
757 pkt.header.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
758
759 mutex_lock(&ds_var_mutex);
760
761 spin_lock_irqsave(&ds_lock, flags);
762 ds_var_doorbell = 0;
763 ds_var_response = -1;
764
778feeb4 765 __ds_send(dp->lp, &pkt, msg_len);
b3e13fbe
DM		 766 spin_unlock_irqrestore(&ds_lock, flags);
767
768 loops = 1000;
769 while (ds_var_doorbell == 0) {
770 if (loops-- < 0)
771 break;
772 barrier();
773 udelay(100);
774 }
775
776 mutex_unlock(&ds_var_mutex);
777
778 if (ds_var_doorbell == 0 ||
779 ds_var_response != DS_VAR_SUCCESS)
780 printk(KERN_ERR PFX "var-config [%s:%s] "
781 "failed, response(%d).\n",
782 var, value,
783 ds_var_response);
784 } else {
785 printk(KERN_ERR PFX "var-config not registered so "
786 "could not set (%s) variable to (%s).\n",
787 var, value);
788 }
789}
790
791void ldom_reboot(const char *boot_command)
792{
793 /* Don't bother with any of this if the boot_command
794 * is empty.
795 */
796 if (boot_command && strlen(boot_command)) {
797 char full_boot_str[256];
798
799 strcpy(full_boot_str, "boot ");
800 strcpy(full_boot_str + strlen("boot "), boot_command);
801
802 ldom_set_var("reboot-command", full_boot_str);
803 }
804 sun4v_mach_sir();
805}
806
4f0234f4
DM		 807void ldom_power_off(void)
808{
809 sun4v_mach_exit(0);
810}
811
e450992d
DM		 812static void ds_conn_reset(struct ds_info *dp)
813{
814 printk(KERN_ERR PFX "ds_conn_reset() from %p\n",
815 __builtin_return_address(0));
816}
817
818static int register_services(struct ds_info *dp)
819{
820 struct ldc_channel *lp = dp->lp;
821 int i;
822
823 for (i = 0; i < ARRAY_SIZE(ds_states); i++) {
824 struct {
825 struct ds_reg_req req;
826 u8 id_buf[256];
827 } pbuf;
828 struct ds_cap_state *cp = &ds_states[i];
829 int err, msg_len;
830 u64 new_count;
831
832 if (cp->state == CAP_STATE_REGISTERED)
833 continue;
834
835 new_count = sched_clock() & 0xffffffff;
836 cp->handle = ((u64) i << 32) | new_count;
837
838 msg_len = (sizeof(struct ds_reg_req) +
839 strlen(cp->service_id));
840
841 memset(&pbuf, 0, sizeof(pbuf));
842 pbuf.req.tag.type = DS_REG_REQ;
843 pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag));
844 pbuf.req.handle = cp->handle;
845 pbuf.req.major = 1;
846 pbuf.req.minor = 0;
847 strcpy(pbuf.req.svc_id, cp->service_id);
848
778feeb4 849 err = __ds_send(lp, &pbuf, msg_len);
e450992d
DM		 850 if (err > 0)
851 cp->state = CAP_STATE_REG_SENT;
852 }
853 return 0;
854}
855
856static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt)
857{
858
859 if (dp->hs_state == DS_HS_START) {
860 if (pkt->type != DS_INIT_ACK)
861 goto conn_reset;
862
863 dp->hs_state = DS_HS_DONE;
864
865 return register_services(dp);
866 }
867
868 if (dp->hs_state != DS_HS_DONE)
869 goto conn_reset;
870
871 if (pkt->type == DS_REG_ACK) {
872 struct ds_reg_ack *ap = (struct ds_reg_ack *) pkt;
873 struct ds_cap_state *cp = find_cap(ap->handle);
874
875 if (!cp) {
876 printk(KERN_ERR PFX "REG ACK for unknown handle %lx\n",
877 ap->handle);
878 return 0;
879 }
880 printk(KERN_INFO PFX "Registered %s service.\n",
881 cp->service_id);
882 cp->state = CAP_STATE_REGISTERED;
883 } else if (pkt->type == DS_REG_NACK) {
884 struct ds_reg_nack *np = (struct ds_reg_nack *) pkt;
885 struct ds_cap_state *cp = find_cap(np->handle);
886
887 if (!cp) {
888 printk(KERN_ERR PFX "REG NACK for "
889 "unknown handle %lx\n",
890 np->handle);
891 return 0;
892 }
4f0234f4 893 printk(KERN_INFO PFX "Could not register %s service\n",
e450992d
DM		 894 cp->service_id);
895 cp->state = CAP_STATE_UNKNOWN;
896 }
897
898 return 0;
899
900conn_reset:
901 ds_conn_reset(dp);
902 return -ECONNRESET;
903}
904
778feeb4
DM		 905static void __send_ds_nack(struct ds_info *dp, u64 handle)
906{
907 struct ds_data_nack nack = {
908 .tag = {
909 .type = DS_NACK,
910 .len = (sizeof(struct ds_data_nack) -
911 sizeof(struct ds_msg_tag)),
912 },
913 .handle = handle,
914 .result = DS_INV_HDL,
915 };
916
917 __ds_send(dp->lp, &nack, sizeof(nack));
918}
919
920static LIST_HEAD(ds_work_list);
921static DECLARE_WAIT_QUEUE_HEAD(ds_wait);
922
923struct ds_queue_entry {
924 struct list_head list;
925 int req_len;
926 int __pad;
927 u64 req[0];
928};
929
930static void process_ds_work(void)
931{
932 struct ds_queue_entry *qp, *tmp;
933 static struct ds_info *dp;
934 unsigned long flags;
935 LIST_HEAD(todo);
936
937 spin_lock_irqsave(&ds_lock, flags);
938 list_splice(&ds_work_list, &todo);
939 INIT_LIST_HEAD(&ds_work_list);
940 spin_unlock_irqrestore(&ds_lock, flags);
941
942 dp = ds_info;
943
944 list_for_each_entry_safe(qp, tmp, &todo, list) {
945 struct ds_data *dpkt = (struct ds_data *) qp->req;
946 struct ds_cap_state *cp = find_cap(dpkt->handle);
947 int req_len = qp->req_len;
948
949 if (!cp) {
950 printk(KERN_ERR PFX "Data for unknown handle %lu\n",
951 dpkt->handle);
952
953 spin_lock_irqsave(&ds_lock, flags);
954 __send_ds_nack(dp, dpkt->handle);
955 spin_unlock_irqrestore(&ds_lock, flags);
956 } else {
957 cp->data(dp->lp, cp, dpkt, req_len);
958 }
959
960 list_del(&qp->list);
961 kfree(qp);
962 }
963}
964
965static int ds_thread(void *__unused)
966{
967 DEFINE_WAIT(wait);
968
969 while (1) {
970 prepare_to_wait(&ds_wait, &wait, TASK_INTERRUPTIBLE);
971 if (list_empty(&ds_work_list))
972 schedule();
973 finish_wait(&ds_wait, &wait);
974
975 if (kthread_should_stop())
976 break;
977
978 process_ds_work();
979 }
980
981 return 0;
982}
983
e450992d
DM		 984static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len)
985{
986 struct ds_data *dpkt = (struct ds_data *) pkt;
778feeb4
DM		 987 struct ds_queue_entry *qp;
988
989 qp = kmalloc(sizeof(struct ds_queue_entry) + len, GFP_ATOMIC);
990 if (!qp) {
991 __send_ds_nack(dp, dpkt->handle);
e450992d 992 } else {
778feeb4
DM		 993 memcpy(&qp->req, pkt, len);
994 list_add_tail(&qp->list, &ds_work_list);
995 wake_up(&ds_wait);
e450992d
DM		 996 }
997 return 0;
998}
999
1000static void ds_up(struct ds_info *dp)
1001{
1002 struct ldc_channel *lp = dp->lp;
1003 struct ds_ver_req req;
1004 int err;
1005
1006 req.tag.type = DS_INIT_REQ;
1007 req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag);
1008 req.ver.major = 1;
1009 req.ver.minor = 0;
1010
778feeb4 1011 err = __ds_send(lp, &req, sizeof(req));
e450992d
DM		 1012 if (err > 0)
1013 dp->hs_state = DS_HS_START;
1014}
1015
8a2950cc
DM		 1016static void ds_reset(struct ds_info *dp)
1017{
1018 int i;
1019
1020 dp->hs_state = 0;
1021
1022 for (i = 0; i < ARRAY_SIZE(ds_states); i++) {
1023 struct ds_cap_state *cp = &ds_states[i];
1024
1025 cp->state = CAP_STATE_UNKNOWN;
1026 }
1027}
1028
e450992d
DM		 1029static void ds_event(void *arg, int event)
1030{
1031 struct ds_info *dp = arg;
1032 struct ldc_channel *lp = dp->lp;
1033 unsigned long flags;
1034 int err;
1035
1036 spin_lock_irqsave(&ds_lock, flags);
1037
1038 if (event == LDC_EVENT_UP) {
1039 ds_up(dp);
1040 spin_unlock_irqrestore(&ds_lock, flags);
1041 return;
1042 }
1043
8a2950cc
DM		 1044 if (event == LDC_EVENT_RESET) {
1045 ds_reset(dp);
1046 spin_unlock_irqrestore(&ds_lock, flags);
1047 return;
1048 }
1049
e450992d
DM		 1050 if (event != LDC_EVENT_DATA_READY) {
1051 printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event);
1052 spin_unlock_irqrestore(&ds_lock, flags);
1053 return;
1054 }
1055
1056 err = 0;
1057 while (1) {
1058 struct ds_msg_tag *tag;
1059
1060 err = ldc_read(lp, dp->rcv_buf, sizeof(*tag));
1061
1062 if (unlikely(err < 0)) {
1063 if (err == -ECONNRESET)
1064 ds_conn_reset(dp);
1065 break;
1066 }
1067 if (err == 0)
1068 break;
1069
1070 tag = dp->rcv_buf;
1071 err = ldc_read(lp, tag + 1, tag->len);
1072
1073 if (unlikely(err < 0)) {
1074 if (err == -ECONNRESET)
1075 ds_conn_reset(dp);
1076 break;
1077 }
1078 if (err < tag->len)
1079 break;
1080
1081 if (tag->type < DS_DATA)
1082 err = ds_handshake(dp, dp->rcv_buf);
1083 else
1084 err = ds_data(dp, dp->rcv_buf,
1085 sizeof(*tag) + err);
1086 if (err == -ECONNRESET)
1087 break;
1088 }
1089
1090 spin_unlock_irqrestore(&ds_lock, flags);
1091}
1092
1093static int __devinit ds_probe(struct vio_dev *vdev,
1094 const struct vio_device_id *id)
1095{
1096 static int ds_version_printed;
e450992d
DM		 1097 struct ldc_channel_config ds_cfg = {
1098 .event = ds_event,
1099 .mtu = 4096,
1100 .mode = LDC_MODE_STREAM,
1101 };
1102 struct ldc_channel *lp;
1103 struct ds_info *dp;
e450992d
DM		 1104 int err;
1105
1106 if (ds_version_printed++ == 0)
1107 printk(KERN_INFO "%s", version);
1108
e450992d
DM		 1109 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1110 err = -ENOMEM;
1111 if (!dp)
1112 goto out_err;
1113
1114 dp->rcv_buf = kzalloc(4096, GFP_KERNEL);
1115 if (!dp->rcv_buf)
1116 goto out_free_dp;
1117
1118 dp->rcv_buf_len = 4096;
1119
43fdf274
DM		 1120 ds_cfg.tx_irq = vdev->tx_irq;
1121 ds_cfg.rx_irq = vdev->rx_irq;
e450992d 1122
43fdf274 1123 lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp);
e450992d
DM		 1124 if (IS_ERR(lp)) {
1125 err = PTR_ERR(lp);
1126 goto out_free_rcv_buf;
1127 }
1128 dp->lp = lp;
1129
133f09a1 1130 err = ldc_bind(lp, "DS");
e450992d
DM		 1131 if (err)
1132 goto out_free_ldc;
1133
b3e13fbe
DM		 1134 ds_info = dp;
1135
e450992d
DM		 1136 return err;
1137
1138out_free_ldc:
1139 ldc_free(dp->lp);
1140
1141out_free_rcv_buf:
1142 kfree(dp->rcv_buf);
1143
1144out_free_dp:
1145 kfree(dp);
1146
1147out_err:
1148 return err;
1149}
1150
1151static int ds_remove(struct vio_dev *vdev)
1152{
1153 return 0;
1154}
1155
1156static struct vio_device_id ds_match[] = {
1157 {
1158 .type = "domain-services-port",
1159 },
1160 {},
1161};
1162
1163static struct vio_driver ds_driver = {
1164 .id_table = ds_match,
1165 .probe = ds_probe,
1166 .remove = ds_remove,
1167 .driver = {
1168 .name = "ds",
1169 .owner = THIS_MODULE,
1170 }
1171};
1172
1173static int __init ds_init(void)
1174{
1175 int i;
1176
1177 for (i = 0; i < ARRAY_SIZE(ds_states); i++)
1178 ds_states[i].handle = ((u64)i << 32);
1179
778feeb4 1180 kthread_run(ds_thread, NULL, "kldomd");
bd0e11ff 1181
e450992d
DM		 1182 return vio_register_driver(&ds_driver);
1183}
1184
1185subsys_initcall(ds_init);
Linux 6.x block layer and io_uring tree(s)