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TOMOYO Linux Cross Reference
Linux/arch/sparc/kernel/ds.c

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Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 __cpuinit dr_cpu_configure(struct ds_info *dp,
532                                       struct ds_cap_state *cp,
533                                       u64 req_num,
534                                       cpumask_t *mask)
535 {
536         struct ds_data *resp;
537         int resp_len, ncpus, cpu;
538         unsigned long flags;
539 
540         ncpus = cpumask_weight(mask);
541         resp_len = dr_cpu_size_response(ncpus);
542         resp = kzalloc(resp_len, GFP_KERNEL);
543         if (!resp)
544                 return -ENOMEM;
545 
546         dr_cpu_init_response(resp, req_num, cp->handle,
547                              resp_len, ncpus, mask,
548                              DR_CPU_STAT_CONFIGURED);
549 
550         mdesc_populate_present_mask(mask);
551         mdesc_fill_in_cpu_data(mask);
552 
553         for_each_cpu(cpu, mask) {
554                 int err;
555 
556                 printk(KERN_INFO "ds-%llu: Starting cpu %d...\n",
557                        dp->id, cpu);
558                 err = cpu_up(cpu);
559                 if (err) {
560                         __u32 res = DR_CPU_RES_FAILURE;
561                         __u32 stat = DR_CPU_STAT_UNCONFIGURED;
562 
563                         if (!cpu_present(cpu)) {
564                                 /* CPU not present in MD */
565                                 res = DR_CPU_RES_NOT_IN_MD;
566                                 stat = DR_CPU_STAT_NOT_PRESENT;
567                         } else if (err == -ENODEV) {
568                                 /* CPU did not call in successfully */
569                                 res = DR_CPU_RES_CPU_NOT_RESPONDING;
570                         }
571 
572                         printk(KERN_INFO "ds-%llu: CPU startup failed err=%d\n",
573                                dp->id, err);
574                         dr_cpu_mark(resp, cpu, ncpus, res, stat);
575                 }
576         }
577 
578         spin_lock_irqsave(&ds_lock, flags);
579         __ds_send(dp->lp, resp, resp_len);
580         spin_unlock_irqrestore(&ds_lock, flags);
581 
582         kfree(resp);
583 
584         /* Redistribute IRQs, taking into account the new cpus.  */
585         fixup_irqs();
586 
587         return 0;
588 }
589 
590 static int dr_cpu_unconfigure(struct ds_info *dp,
591                               struct ds_cap_state *cp,
592                               u64 req_num,
593                               cpumask_t *mask)
594 {
595         struct ds_data *resp;
596         int resp_len, ncpus, cpu;
597         unsigned long flags;
598 
599         ncpus = cpumask_weight(mask);
600         resp_len = dr_cpu_size_response(ncpus);
601         resp = kzalloc(resp_len, GFP_KERNEL);
602         if (!resp)
603                 return -ENOMEM;
604 
605         dr_cpu_init_response(resp, req_num, cp->handle,
606                              resp_len, ncpus, mask,
607                              DR_CPU_STAT_UNCONFIGURED);
608 
609         for_each_cpu(cpu, mask) {
610                 int err;
611 
612                 printk(KERN_INFO "ds-%llu: Shutting down cpu %d...\n",
613                        dp->id, cpu);
614                 err = cpu_down(cpu);
615                 if (err)
616                         dr_cpu_mark(resp, cpu, ncpus,
617                                     DR_CPU_RES_FAILURE,
618                                     DR_CPU_STAT_CONFIGURED);
619         }
620 
621         spin_lock_irqsave(&ds_lock, flags);
622         __ds_send(dp->lp, resp, resp_len);
623         spin_unlock_irqrestore(&ds_lock, flags);
624 
625         kfree(resp);
626 
627         return 0;
628 }
629 
630 static void __cpuinit dr_cpu_data(struct ds_info *dp,
631                                   struct ds_cap_state *cp,
632                                   void *buf, int len)
633 {
634         struct ds_data *data = buf;
635         struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
636         u32 *cpu_list = (u32 *) (tag + 1);
637         u64 req_num = tag->req_num;
638         cpumask_t mask;
639         unsigned int i;
640         int err;
641 
642         switch (tag->type) {
643         case DR_CPU_CONFIGURE:
644         case DR_CPU_UNCONFIGURE:
645         case DR_CPU_FORCE_UNCONFIGURE:
646                 break;
647 
648         default:
649                 dr_cpu_send_error(dp, cp, data);
650                 return;
651         }
652 
653         purge_dups(cpu_list, tag->num_records);
654 
655         cpumask_clear(&mask);
656         for (i = 0; i < tag->num_records; i++) {
657                 if (cpu_list[i] == CPU_SENTINEL)
658                         continue;
659 
660                 if (cpu_list[i] < nr_cpu_ids)
661                         cpumask_set_cpu(cpu_list[i], &mask);
662         }
663 
664         if (tag->type == DR_CPU_CONFIGURE)
665                 err = dr_cpu_configure(dp, cp, req_num, &mask);
666         else
667                 err = dr_cpu_unconfigure(dp, cp, req_num, &mask);
668 
669         if (err)
670                 dr_cpu_send_error(dp, cp, data);
671 }
672 #endif /* CONFIG_HOTPLUG_CPU */
673 
674 struct ds_pri_msg {
675         __u64                           req_num;
676         __u64                           type;
677 #define DS_PRI_REQUEST                  0x00
678 #define DS_PRI_DATA                     0x01
679 #define DS_PRI_UPDATE                   0x02
680 };
681 
682 static void ds_pri_data(struct ds_info *dp,
683                         struct ds_cap_state *cp,
684                         void *buf, int len)
685 {
686         struct ds_data *dpkt = buf;
687         struct ds_pri_msg *rp;
688 
689         rp = (struct ds_pri_msg *) (dpkt + 1);
690 
691         printk(KERN_INFO "ds-%llu: PRI REQ [%llx:%llx], len=%d\n",
692                dp->id, rp->req_num, rp->type, len);
693 }
694 
695 struct ds_var_hdr {
696         __u32                           type;
697 #define DS_VAR_SET_REQ                  0x00
698 #define DS_VAR_DELETE_REQ               0x01
699 #define DS_VAR_SET_RESP                 0x02
700 #define DS_VAR_DELETE_RESP              0x03
701 };
702 
703 struct ds_var_set_msg {
704         struct ds_var_hdr               hdr;
705         char                            name_and_value[0];
706 };
707 
708 struct ds_var_delete_msg {
709         struct ds_var_hdr               hdr;
710         char                            name[0];
711 };
712 
713 struct ds_var_resp {
714         struct ds_var_hdr               hdr;
715         __u32                           result;
716 #define DS_VAR_SUCCESS                  0x00
717 #define DS_VAR_NO_SPACE                 0x01
718 #define DS_VAR_INVALID_VAR              0x02
719 #define DS_VAR_INVALID_VAL              0x03
720 #define DS_VAR_NOT_PRESENT              0x04
721 };
722 
723 static DEFINE_MUTEX(ds_var_mutex);
724 static int ds_var_doorbell;
725 static int ds_var_response;
726 
727 static void ds_var_data(struct ds_info *dp,
728                         struct ds_cap_state *cp,
729                         void *buf, int len)
730 {
731         struct ds_data *dpkt = buf;
732         struct ds_var_resp *rp;
733 
734         rp = (struct ds_var_resp *) (dpkt + 1);
735 
736         if (rp->hdr.type != DS_VAR_SET_RESP &&
737             rp->hdr.type != DS_VAR_DELETE_RESP)
738                 return;
739 
740         ds_var_response = rp->result;
741         wmb();
742         ds_var_doorbell = 1;
743 }
744 
745 void ldom_set_var(const char *var, const char *value)
746 {
747         struct ds_cap_state *cp;
748         struct ds_info *dp;
749         unsigned long flags;
750 
751         spin_lock_irqsave(&ds_lock, flags);
752         cp = NULL;
753         for (dp = ds_info_list; dp; dp = dp->next) {
754                 struct ds_cap_state *tmp;
755 
756                 tmp = find_cap_by_string(dp, "var-config");
757                 if (tmp && tmp->state == CAP_STATE_REGISTERED) {
758                         cp = tmp;
759                         break;
760                 }
761         }
762         if (!cp) {
763                 for (dp = ds_info_list; dp; dp = dp->next) {
764                         struct ds_cap_state *tmp;
765 
766                         tmp = find_cap_by_string(dp, "var-config-backup");
767                         if (tmp && tmp->state == CAP_STATE_REGISTERED) {
768                                 cp = tmp;
769                                 break;
770                         }
771                 }
772         }
773         spin_unlock_irqrestore(&ds_lock, flags);
774 
775         if (cp) {
776                 union {
777                         struct {
778                                 struct ds_data          data;
779                                 struct ds_var_set_msg   msg;
780                         } header;
781                         char                    all[512];
782                 } pkt;
783                 char  *base, *p;
784                 int msg_len, loops;
785 
786                 memset(&pkt, 0, sizeof(pkt));
787                 pkt.header.data.tag.type = DS_DATA;
788                 pkt.header.data.handle = cp->handle;
789                 pkt.header.msg.hdr.type = DS_VAR_SET_REQ;
790                 base = p = &pkt.header.msg.name_and_value[0];
791                 strcpy(p, var);
792                 p += strlen(var) + 1;
793                 strcpy(p, value);
794                 p += strlen(value) + 1;
795 
796                 msg_len = (sizeof(struct ds_data) +
797                            sizeof(struct ds_var_set_msg) +
798                            (p - base));
799                 msg_len = (msg_len + 3) & ~3;
800                 pkt.header.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
801 
802                 mutex_lock(&ds_var_mutex);
803 
804                 spin_lock_irqsave(&ds_lock, flags);
805                 ds_var_doorbell = 0;
806                 ds_var_response = -1;
807 
808                 __ds_send(dp->lp, &pkt, msg_len);
809                 spin_unlock_irqrestore(&ds_lock, flags);
810 
811                 loops = 1000;
812                 while (ds_var_doorbell == 0) {
813                         if (loops-- < 0)
814                                 break;
815                         barrier();
816                         udelay(100);
817                 }
818 
819                 mutex_unlock(&ds_var_mutex);
820 
821                 if (ds_var_doorbell == 0 ||
822                     ds_var_response != DS_VAR_SUCCESS)
823                         printk(KERN_ERR "ds-%llu: var-config [%s:%s] "
824                                "failed, response(%d).\n",
825                                dp->id, var, value,
826                                ds_var_response);
827         } else {
828                 printk(KERN_ERR PFX "var-config not registered so "
829                        "could not set (%s) variable to (%s).\n",
830                        var, value);
831         }
832 }
833 
834 static char full_boot_str[256] __attribute__((aligned(32)));
835 static int reboot_data_supported;
836 
837 void ldom_reboot(const char *boot_command)
838 {
839         /* Don't bother with any of this if the boot_command
840          * is empty.
841          */
842         if (boot_command && strlen(boot_command)) {
843                 unsigned long len;
844 
845                 strcpy(full_boot_str, "boot ");
846                 strcpy(full_boot_str + strlen("boot "), boot_command);
847                 len = strlen(full_boot_str);
848 
849                 if (reboot_data_supported) {
850                         unsigned long ra = kimage_addr_to_ra(full_boot_str);
851                         unsigned long hv_ret;
852 
853                         hv_ret = sun4v_reboot_data_set(ra, len);
854                         if (hv_ret != HV_EOK)
855                                 pr_err("SUN4V: Unable to set reboot data "
856                                        "hv_ret=%lu\n", hv_ret);
857                 } else {
858                         ldom_set_var("reboot-command", full_boot_str);
859                 }
860         }
861         sun4v_mach_sir();
862 }
863 
864 void ldom_power_off(void)
865 {
866         sun4v_mach_exit(0);
867 }
868 
869 static void ds_conn_reset(struct ds_info *dp)
870 {
871         printk(KERN_ERR "ds-%llu: ds_conn_reset() from %pf\n",
872                dp->id, __builtin_return_address(0));
873 }
874 
875 static int register_services(struct ds_info *dp)
876 {
877         struct ldc_channel *lp = dp->lp;
878         int i;
879 
880         for (i = 0; i < dp->num_ds_states; i++) {
881                 struct {
882                         struct ds_reg_req req;
883                         u8 id_buf[256];
884                 } pbuf;
885                 struct ds_cap_state *cp = &dp->ds_states[i];
886                 int err, msg_len;
887                 u64 new_count;
888 
889                 if (cp->state == CAP_STATE_REGISTERED)
890                         continue;
891 
892                 new_count = sched_clock() & 0xffffffff;
893                 cp->handle = ((u64) i << 32) | new_count;
894 
895                 msg_len = (sizeof(struct ds_reg_req) +
896                            strlen(cp->service_id));
897 
898                 memset(&pbuf, 0, sizeof(pbuf));
899                 pbuf.req.tag.type = DS_REG_REQ;
900                 pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag));
901                 pbuf.req.handle = cp->handle;
902                 pbuf.req.major = 1;
903                 pbuf.req.minor = 0;
904                 strcpy(pbuf.req.svc_id, cp->service_id);
905 
906                 err = __ds_send(lp, &pbuf, msg_len);
907                 if (err > 0)
908                         cp->state = CAP_STATE_REG_SENT;
909         }
910         return 0;
911 }
912 
913 static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt)
914 {
915 
916         if (dp->hs_state == DS_HS_START) {
917                 if (pkt->type != DS_INIT_ACK)
918                         goto conn_reset;
919 
920                 dp->hs_state = DS_HS_DONE;
921 
922                 return register_services(dp);
923         }
924 
925         if (dp->hs_state != DS_HS_DONE)
926                 goto conn_reset;
927 
928         if (pkt->type == DS_REG_ACK) {
929                 struct ds_reg_ack *ap = (struct ds_reg_ack *) pkt;
930                 struct ds_cap_state *cp = find_cap(dp, ap->handle);
931 
932                 if (!cp) {
933                         printk(KERN_ERR "ds-%llu: REG ACK for unknown "
934                                "handle %llx\n", dp->id, ap->handle);
935                         return 0;
936                 }
937                 printk(KERN_INFO "ds-%llu: Registered %s service.\n",
938                        dp->id, cp->service_id);
939                 cp->state = CAP_STATE_REGISTERED;
940         } else if (pkt->type == DS_REG_NACK) {
941                 struct ds_reg_nack *np = (struct ds_reg_nack *) pkt;
942                 struct ds_cap_state *cp = find_cap(dp, np->handle);
943 
944                 if (!cp) {
945                         printk(KERN_ERR "ds-%llu: REG NACK for "
946                                "unknown handle %llx\n",
947                                dp->id, np->handle);
948                         return 0;
949                 }
950                 cp->state = CAP_STATE_UNKNOWN;
951         }
952 
953         return 0;
954 
955 conn_reset:
956         ds_conn_reset(dp);
957         return -ECONNRESET;
958 }
959 
960 static void __send_ds_nack(struct ds_info *dp, u64 handle)
961 {
962         struct ds_data_nack nack = {
963                 .tag = {
964                         .type = DS_NACK,
965                         .len = (sizeof(struct ds_data_nack) -
966                                 sizeof(struct ds_msg_tag)),
967                 },
968                 .handle = handle,
969                 .result = DS_INV_HDL,
970         };
971 
972         __ds_send(dp->lp, &nack, sizeof(nack));
973 }
974 
975 static LIST_HEAD(ds_work_list);
976 static DECLARE_WAIT_QUEUE_HEAD(ds_wait);
977 
978 struct ds_queue_entry {
979         struct list_head                list;
980         struct ds_info                  *dp;
981         int                             req_len;
982         int                             __pad;
983         u64                             req[0];
984 };
985 
986 static void process_ds_work(void)
987 {
988         struct ds_queue_entry *qp, *tmp;
989         unsigned long flags;
990         LIST_HEAD(todo);
991 
992         spin_lock_irqsave(&ds_lock, flags);
993         list_splice_init(&ds_work_list, &todo);
994         spin_unlock_irqrestore(&ds_lock, flags);
995 
996         list_for_each_entry_safe(qp, tmp, &todo, list) {
997                 struct ds_data *dpkt = (struct ds_data *) qp->req;
998                 struct ds_info *dp = qp->dp;
999                 struct ds_cap_state *cp = find_cap(dp, dpkt->handle);
1000                 int req_len = qp->req_len;
1001 
1002                 if (!cp) {
1003                         printk(KERN_ERR "ds-%llu: Data for unknown "
1004                                "handle %llu\n",
1005                                dp->id, dpkt->handle);
1006 
1007                         spin_lock_irqsave(&ds_lock, flags);
1008                         __send_ds_nack(dp, dpkt->handle);
1009                         spin_unlock_irqrestore(&ds_lock, flags);
1010                 } else {
1011                         cp->data(dp, cp, dpkt, req_len);
1012                 }
1013 
1014                 list_del(&qp->list);
1015                 kfree(qp);
1016         }
1017 }
1018 
1019 static int ds_thread(void *__unused)
1020 {
1021         DEFINE_WAIT(wait);
1022 
1023         while (1) {
1024                 prepare_to_wait(&ds_wait, &wait, TASK_INTERRUPTIBLE);
1025                 if (list_empty(&ds_work_list))
1026                         schedule();
1027                 finish_wait(&ds_wait, &wait);
1028 
1029                 if (kthread_should_stop())
1030                         break;
1031 
1032                 process_ds_work();
1033         }
1034 
1035         return 0;
1036 }
1037 
1038 static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len)
1039 {
1040         struct ds_data *dpkt = (struct ds_data *) pkt;
1041         struct ds_queue_entry *qp;
1042 
1043         qp = kmalloc(sizeof(struct ds_queue_entry) + len, GFP_ATOMIC);
1044         if (!qp) {
1045                 __send_ds_nack(dp, dpkt->handle);
1046         } else {
1047                 qp->dp = dp;
1048                 memcpy(&qp->req, pkt, len);
1049                 list_add_tail(&qp->list, &ds_work_list);
1050                 wake_up(&ds_wait);
1051         }
1052         return 0;
1053 }
1054 
1055 static void ds_up(struct ds_info *dp)
1056 {
1057         struct ldc_channel *lp = dp->lp;
1058         struct ds_ver_req req;
1059         int err;
1060 
1061         req.tag.type = DS_INIT_REQ;
1062         req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag);
1063         req.ver.major = 1;
1064         req.ver.minor = 0;
1065 
1066         err = __ds_send(lp, &req, sizeof(req));
1067         if (err > 0)
1068                 dp->hs_state = DS_HS_START;
1069 }
1070 
1071 static void ds_reset(struct ds_info *dp)
1072 {
1073         int i;
1074 
1075         dp->hs_state = 0;
1076 
1077         for (i = 0; i < dp->num_ds_states; i++) {
1078                 struct ds_cap_state *cp = &dp->ds_states[i];
1079 
1080                 cp->state = CAP_STATE_UNKNOWN;
1081         }
1082 }
1083 
1084 static void ds_event(void *arg, int event)
1085 {
1086         struct ds_info *dp = arg;
1087         struct ldc_channel *lp = dp->lp;
1088         unsigned long flags;
1089         int err;
1090 
1091         spin_lock_irqsave(&ds_lock, flags);
1092 
1093         if (event == LDC_EVENT_UP) {
1094                 ds_up(dp);
1095                 spin_unlock_irqrestore(&ds_lock, flags);
1096                 return;
1097         }
1098 
1099         if (event == LDC_EVENT_RESET) {
1100                 ds_reset(dp);
1101                 spin_unlock_irqrestore(&ds_lock, flags);
1102                 return;
1103         }
1104 
1105         if (event != LDC_EVENT_DATA_READY) {
1106                 printk(KERN_WARNING "ds-%llu: Unexpected LDC event %d\n",
1107                        dp->id, event);
1108                 spin_unlock_irqrestore(&ds_lock, flags);
1109                 return;
1110         }
1111 
1112         err = 0;
1113         while (1) {
1114                 struct ds_msg_tag *tag;
1115 
1116                 err = ldc_read(lp, dp->rcv_buf, sizeof(*tag));
1117 
1118                 if (unlikely(err < 0)) {
1119                         if (err == -ECONNRESET)
1120                                 ds_conn_reset(dp);
1121                         break;
1122                 }
1123                 if (err == 0)
1124                         break;
1125 
1126                 tag = dp->rcv_buf;
1127                 err = ldc_read(lp, tag + 1, tag->len);
1128 
1129                 if (unlikely(err < 0)) {
1130                         if (err == -ECONNRESET)
1131                                 ds_conn_reset(dp);
1132                         break;
1133                 }
1134                 if (err < tag->len)
1135                         break;
1136 
1137                 if (tag->type < DS_DATA)
1138                         err = ds_handshake(dp, dp->rcv_buf);
1139                 else
1140                         err = ds_data(dp, dp->rcv_buf,
1141                                       sizeof(*tag) + err);
1142                 if (err == -ECONNRESET)
1143                         break;
1144         }
1145 
1146         spin_unlock_irqrestore(&ds_lock, flags);
1147 }
1148 
1149 static int ds_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1150 {
1151         static int ds_version_printed;
1152         struct ldc_channel_config ds_cfg = {
1153                 .event          = ds_event,
1154                 .mtu            = 4096,
1155                 .mode           = LDC_MODE_STREAM,
1156         };
1157         struct mdesc_handle *hp;
1158         struct ldc_channel *lp;
1159         struct ds_info *dp;
1160         const u64 *val;
1161         int err, i;
1162 
1163         if (ds_version_printed++ == 0)
1164                 printk(KERN_INFO "%s", version);
1165 
1166         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1167         err = -ENOMEM;
1168         if (!dp)
1169                 goto out_err;
1170 
1171         hp = mdesc_grab();
1172         val = mdesc_get_property(hp, vdev->mp, "id", NULL);
1173         if (val)
1174                 dp->id = *val;
1175         mdesc_release(hp);
1176 
1177         dp->rcv_buf = kzalloc(4096, GFP_KERNEL);
1178         if (!dp->rcv_buf)
1179                 goto out_free_dp;
1180 
1181         dp->rcv_buf_len = 4096;
1182 
1183         dp->ds_states = kmemdup(ds_states_template,
1184                                 sizeof(ds_states_template), GFP_KERNEL);
1185         if (!dp->ds_states)
1186                 goto out_free_rcv_buf;
1187 
1188         dp->num_ds_states = ARRAY_SIZE(ds_states_template);
1189 
1190         for (i = 0; i < dp->num_ds_states; i++)
1191                 dp->ds_states[i].handle = ((u64)i << 32);
1192 
1193         ds_cfg.tx_irq = vdev->tx_irq;
1194         ds_cfg.rx_irq = vdev->rx_irq;
1195 
1196         lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp);
1197         if (IS_ERR(lp)) {
1198                 err = PTR_ERR(lp);
1199                 goto out_free_ds_states;
1200         }
1201         dp->lp = lp;
1202 
1203         err = ldc_bind(lp, "DS");
1204         if (err)
1205                 goto out_free_ldc;
1206 
1207         spin_lock_irq(&ds_lock);
1208         dp->next = ds_info_list;
1209         ds_info_list = dp;
1210         spin_unlock_irq(&ds_lock);
1211 
1212         return err;
1213 
1214 out_free_ldc:
1215         ldc_free(dp->lp);
1216 
1217 out_free_ds_states:
1218         kfree(dp->ds_states);
1219 
1220 out_free_rcv_buf:
1221         kfree(dp->rcv_buf);
1222 
1223 out_free_dp:
1224         kfree(dp);
1225 
1226 out_err:
1227         return err;
1228 }
1229 
1230 static int ds_remove(struct vio_dev *vdev)
1231 {
1232         return 0;
1233 }
1234 
1235 static const struct vio_device_id ds_match[] = {
1236         {
1237                 .type = "domain-services-port",
1238         },
1239         {},
1240 };
1241 
1242 static struct vio_driver ds_driver = {
1243         .id_table       = ds_match,
1244         .probe          = ds_probe,
1245         .remove         = ds_remove,
1246         .name           = "ds",
1247 };
1248 
1249 static int __init ds_init(void)
1250 {
1251         unsigned long hv_ret, major, minor;
1252 
1253         if (tlb_type == hypervisor) {
1254                 hv_ret = sun4v_get_version(HV_GRP_REBOOT_DATA, &major, &minor);
1255                 if (hv_ret == HV_EOK) {
1256                         pr_info("SUN4V: Reboot data supported (maj=%lu,min=%lu).\n",
1257                                 major, minor);
1258                         reboot_data_supported = 1;
1259                 }
1260         }
1261         kthread_run(ds_thread, NULL, "kldomd");
1262 
1263         return vio_register_driver(&ds_driver);
1264 }
1265 
1266 fs_initcall(ds_init);
1267 

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