Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/arch/sparc/kernel/ds.c

  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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
724 static void ds_var_data(struct ds_info *dp,
725                         struct ds_cap_state *cp,
726                         void *buf, int len)
727 {
728         struct ds_data *dpkt = buf;
729         struct ds_var_resp *rp;
730 
731         rp = (struct ds_var_resp *) (dpkt + 1);
732 
733         if (rp->hdr.type != DS_VAR_SET_RESP &&
734             rp->hdr.type != DS_VAR_DELETE_RESP)
735                 return;
736 
737         ds_var_response = rp->result;
738         wmb();
739         ds_var_doorbell = 1;
740 }
741 
742 void ldom_set_var(const char *var, const char *value)
743 {
744         struct ds_cap_state *cp;
745         struct ds_info *dp;
746         unsigned long flags;
747 
748         spin_lock_irqsave(&ds_lock, flags);
749         cp = NULL;
750         for (dp = ds_info_list; dp; dp = dp->next) {
751                 struct ds_cap_state *tmp;
752 
753                 tmp = find_cap_by_string(dp, "var-config");
754                 if (tmp && tmp->state == CAP_STATE_REGISTERED) {
755                         cp = tmp;
756                         break;
757                 }
758         }
759         if (!cp) {
760                 for (dp = ds_info_list; dp; dp = dp->next) {
761                         struct ds_cap_state *tmp;
762 
763                         tmp = find_cap_by_string(dp, "var-config-backup");
764                         if (tmp && tmp->state == CAP_STATE_REGISTERED) {
765                                 cp = tmp;
766                                 break;
767                         }
768                 }
769         }
770         spin_unlock_irqrestore(&ds_lock, flags);
771 
772         if (cp) {
773                 union {
774                         struct {
775                                 struct ds_data          data;
776                                 struct ds_var_set_msg   msg;
777                         } header;
778                         char                    all[512];
779                 } pkt;
780                 char  *base, *p;
781                 int msg_len, loops;
782 
783                 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 
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 
871 void ldom_power_off(void)
872 {
873         sun4v_mach_exit(0);
874 }
875 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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);
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, "DS");
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 
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 
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 

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