1 /* ds.c: Domain Services driver for Logical Domains
3 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
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/sched/clock.h>
13 #include <linux/delay.h>
14 #include <linux/mutex.h>
15 #include <linux/kthread.h>
16 #include <linux/reboot.h>
17 #include <linux/cpu.h>
19 #include <asm/hypervisor.h>
22 #include <asm/mdesc.h>
28 #define DRV_MODULE_NAME "ds"
29 #define PFX DRV_MODULE_NAME ": "
30 #define DRV_MODULE_VERSION "1.0"
31 #define DRV_MODULE_RELDATE "Jul 11, 2007"
33 static char version[] =
34 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
35 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
36 MODULE_DESCRIPTION("Sun LDOM domain services driver");
37 MODULE_LICENSE("GPL");
38 MODULE_VERSION(DRV_MODULE_VERSION);
42 #define DS_INIT_REQ 0x00
43 #define DS_INIT_ACK 0x01
44 #define DS_INIT_NACK 0x02
45 #define DS_REG_REQ 0x03
46 #define DS_REG_ACK 0x04
47 #define DS_REG_NACK 0x05
48 #define DS_UNREG_REQ 0x06
49 #define DS_UNREG_ACK 0x07
50 #define DS_UNREG_NACK 0x08
59 #define DS_REG_VER_NACK 0x01
60 #define DS_REG_DUP 0x02
61 #define DS_INV_HDL 0x03
62 #define DS_TYPE_UNKNOWN 0x04
70 struct ds_msg_tag tag;
71 struct ds_version ver;
75 struct ds_msg_tag tag;
80 struct ds_msg_tag tag;
85 struct ds_msg_tag tag;
93 struct ds_msg_tag tag;
99 struct ds_msg_tag tag;
104 struct ds_unreg_req {
105 struct ds_msg_tag tag;
109 struct ds_unreg_ack {
110 struct ds_msg_tag tag;
114 struct ds_unreg_nack {
115 struct ds_msg_tag tag;
120 struct ds_msg_tag tag;
124 struct ds_data_nack {
125 struct ds_msg_tag tag;
131 struct ds_cap_state {
134 void (*data)(struct ds_info *dp,
135 struct ds_cap_state *cp,
138 const char *service_id;
141 #define CAP_STATE_UNKNOWN 0x00
142 #define CAP_STATE_REG_SENT 0x01
143 #define CAP_STATE_REGISTERED 0x02
146 static void md_update_data(struct ds_info *dp, struct ds_cap_state *cp,
148 static void domain_shutdown_data(struct ds_info *dp,
149 struct ds_cap_state *cp,
151 static void domain_panic_data(struct ds_info *dp,
152 struct ds_cap_state *cp,
154 #ifdef CONFIG_HOTPLUG_CPU
155 static void dr_cpu_data(struct ds_info *dp,
156 struct ds_cap_state *cp,
159 static void ds_pri_data(struct ds_info *dp,
160 struct ds_cap_state *cp,
162 static void ds_var_data(struct ds_info *dp,
163 struct ds_cap_state *cp,
166 static struct ds_cap_state ds_states_template[] = {
168 .service_id = "md-update",
169 .data = md_update_data,
172 .service_id = "domain-shutdown",
173 .data = domain_shutdown_data,
176 .service_id = "domain-panic",
177 .data = domain_panic_data,
179 #ifdef CONFIG_HOTPLUG_CPU
181 .service_id = "dr-cpu",
190 .service_id = "var-config",
194 .service_id = "var-config-backup",
199 static DEFINE_SPINLOCK(ds_lock);
202 struct ldc_channel *lp;
204 #define DS_HS_START 0x01
205 #define DS_HS_DONE 0x02
212 struct ds_cap_state *ds_states;
215 struct ds_info *next;
218 static struct ds_info *ds_info_list;
220 static struct ds_cap_state *find_cap(struct ds_info *dp, u64 handle)
222 unsigned int index = handle >> 32;
224 if (index >= dp->num_ds_states)
226 return &dp->ds_states[index];
229 static struct ds_cap_state *find_cap_by_string(struct ds_info *dp,
234 for (i = 0; i < dp->num_ds_states; i++) {
235 if (strcmp(dp->ds_states[i].service_id, name))
238 return &dp->ds_states[i];
243 static int __ds_send(struct ldc_channel *lp, void *data, int len)
245 int err, limit = 1000;
248 while (limit-- > 0) {
249 err = ldc_write(lp, data, len);
250 if (!err || (err != -EAGAIN))
258 static int ds_send(struct ldc_channel *lp, void *data, int len)
263 spin_lock_irqsave(&ds_lock, flags);
264 err = __ds_send(lp, data, len);
265 spin_unlock_irqrestore(&ds_lock, flags);
270 struct ds_md_update_req {
274 struct ds_md_update_res {
279 static void md_update_data(struct ds_info *dp,
280 struct ds_cap_state *cp,
283 struct ldc_channel *lp = dp->lp;
284 struct ds_data *dpkt = buf;
285 struct ds_md_update_req *rp;
288 struct ds_md_update_res res;
291 rp = (struct ds_md_update_req *) (dpkt + 1);
293 printk(KERN_INFO "ds-%llu: Machine description update.\n", dp->id);
297 memset(&pkt, 0, sizeof(pkt));
298 pkt.data.tag.type = DS_DATA;
299 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
300 pkt.data.handle = cp->handle;
301 pkt.res.req_num = rp->req_num;
302 pkt.res.result = DS_OK;
304 ds_send(lp, &pkt, sizeof(pkt));
307 struct ds_shutdown_req {
312 struct ds_shutdown_res {
318 static void domain_shutdown_data(struct ds_info *dp,
319 struct ds_cap_state *cp,
322 struct ldc_channel *lp = dp->lp;
323 struct ds_data *dpkt = buf;
324 struct ds_shutdown_req *rp;
327 struct ds_shutdown_res res;
330 rp = (struct ds_shutdown_req *) (dpkt + 1);
332 printk(KERN_ALERT "ds-%llu: Shutdown request from "
333 "LDOM manager received.\n", dp->id);
335 memset(&pkt, 0, sizeof(pkt));
336 pkt.data.tag.type = DS_DATA;
337 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
338 pkt.data.handle = cp->handle;
339 pkt.res.req_num = rp->req_num;
340 pkt.res.result = DS_OK;
341 pkt.res.reason[0] = 0;
343 ds_send(lp, &pkt, sizeof(pkt));
345 orderly_poweroff(true);
348 struct ds_panic_req {
352 struct ds_panic_res {
358 static void domain_panic_data(struct ds_info *dp,
359 struct ds_cap_state *cp,
362 struct ldc_channel *lp = dp->lp;
363 struct ds_data *dpkt = buf;
364 struct ds_panic_req *rp;
367 struct ds_panic_res res;
370 rp = (struct ds_panic_req *) (dpkt + 1);
372 printk(KERN_ALERT "ds-%llu: Panic request from "
373 "LDOM manager received.\n", dp->id);
375 memset(&pkt, 0, sizeof(pkt));
376 pkt.data.tag.type = DS_DATA;
377 pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
378 pkt.data.handle = cp->handle;
379 pkt.res.req_num = rp->req_num;
380 pkt.res.result = DS_OK;
381 pkt.res.reason[0] = 0;
383 ds_send(lp, &pkt, sizeof(pkt));
385 panic("PANIC requested by LDOM manager.");
388 #ifdef CONFIG_HOTPLUG_CPU
392 #define DR_CPU_CONFIGURE 0x43
393 #define DR_CPU_UNCONFIGURE 0x55
394 #define DR_CPU_FORCE_UNCONFIGURE 0x46
395 #define DR_CPU_STATUS 0x53
398 #define DR_CPU_OK 0x6f
399 #define DR_CPU_ERROR 0x65
404 struct dr_cpu_resp_entry {
407 #define DR_CPU_RES_OK 0x00
408 #define DR_CPU_RES_FAILURE 0x01
409 #define DR_CPU_RES_BLOCKED 0x02
410 #define DR_CPU_RES_CPU_NOT_RESPONDING 0x03
411 #define DR_CPU_RES_NOT_IN_MD 0x04
414 #define DR_CPU_STAT_NOT_PRESENT 0x00
415 #define DR_CPU_STAT_UNCONFIGURED 0x01
416 #define DR_CPU_STAT_CONFIGURED 0x02
421 static void __dr_cpu_send_error(struct ds_info *dp,
422 struct ds_cap_state *cp,
423 struct ds_data *data)
425 struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
428 struct dr_cpu_tag tag;
432 memset(&pkt, 0, sizeof(pkt));
433 pkt.data.tag.type = DS_DATA;
434 pkt.data.handle = cp->handle;
435 pkt.tag.req_num = tag->req_num;
436 pkt.tag.type = DR_CPU_ERROR;
437 pkt.tag.num_records = 0;
439 msg_len = (sizeof(struct ds_data) +
440 sizeof(struct dr_cpu_tag));
442 pkt.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
444 __ds_send(dp->lp, &pkt, msg_len);
447 static void dr_cpu_send_error(struct ds_info *dp,
448 struct ds_cap_state *cp,
449 struct ds_data *data)
453 spin_lock_irqsave(&ds_lock, flags);
454 __dr_cpu_send_error(dp, cp, data);
455 spin_unlock_irqrestore(&ds_lock, flags);
458 #define CPU_SENTINEL 0xffffffff
460 static void purge_dups(u32 *list, u32 num_ents)
464 for (i = 0; i < num_ents; i++) {
468 if (cpu == CPU_SENTINEL)
471 for (j = i + 1; j < num_ents; j++) {
473 list[j] = CPU_SENTINEL;
478 static int dr_cpu_size_response(int ncpus)
480 return (sizeof(struct ds_data) +
481 sizeof(struct dr_cpu_tag) +
482 (sizeof(struct dr_cpu_resp_entry) * ncpus));
485 static void dr_cpu_init_response(struct ds_data *resp, u64 req_num,
486 u64 handle, int resp_len, int ncpus,
487 cpumask_t *mask, u32 default_stat)
489 struct dr_cpu_resp_entry *ent;
490 struct dr_cpu_tag *tag;
493 tag = (struct dr_cpu_tag *) (resp + 1);
494 ent = (struct dr_cpu_resp_entry *) (tag + 1);
496 resp->tag.type = DS_DATA;
497 resp->tag.len = resp_len - sizeof(struct ds_msg_tag);
498 resp->handle = handle;
499 tag->req_num = req_num;
500 tag->type = DR_CPU_OK;
501 tag->num_records = ncpus;
504 for_each_cpu(cpu, mask) {
506 ent[i].result = DR_CPU_RES_OK;
507 ent[i].stat = default_stat;
513 static void dr_cpu_mark(struct ds_data *resp, int cpu, int ncpus,
516 struct dr_cpu_resp_entry *ent;
517 struct dr_cpu_tag *tag;
520 tag = (struct dr_cpu_tag *) (resp + 1);
521 ent = (struct dr_cpu_resp_entry *) (tag + 1);
523 for (i = 0; i < ncpus; i++) {
524 if (ent[i].cpu != cpu)
532 static int dr_cpu_configure(struct ds_info *dp, struct ds_cap_state *cp,
533 u64 req_num, cpumask_t *mask)
535 struct ds_data *resp;
536 int resp_len, ncpus, cpu;
539 ncpus = cpumask_weight(mask);
540 resp_len = dr_cpu_size_response(ncpus);
541 resp = kzalloc(resp_len, GFP_KERNEL);
545 dr_cpu_init_response(resp, req_num, cp->handle,
546 resp_len, ncpus, mask,
547 DR_CPU_STAT_CONFIGURED);
549 mdesc_populate_present_mask(mask);
550 mdesc_fill_in_cpu_data(mask);
552 for_each_cpu(cpu, mask) {
555 printk(KERN_INFO "ds-%llu: Starting cpu %d...\n",
559 __u32 res = DR_CPU_RES_FAILURE;
560 __u32 stat = DR_CPU_STAT_UNCONFIGURED;
562 if (!cpu_present(cpu)) {
563 /* CPU not present in MD */
564 res = DR_CPU_RES_NOT_IN_MD;
565 stat = DR_CPU_STAT_NOT_PRESENT;
566 } else if (err == -ENODEV) {
567 /* CPU did not call in successfully */
568 res = DR_CPU_RES_CPU_NOT_RESPONDING;
571 printk(KERN_INFO "ds-%llu: CPU startup failed err=%d\n",
573 dr_cpu_mark(resp, cpu, ncpus, res, stat);
577 spin_lock_irqsave(&ds_lock, flags);
578 __ds_send(dp->lp, resp, resp_len);
579 spin_unlock_irqrestore(&ds_lock, flags);
583 /* Redistribute IRQs, taking into account the new cpus. */
589 static int dr_cpu_unconfigure(struct ds_info *dp,
590 struct ds_cap_state *cp,
594 struct ds_data *resp;
595 int resp_len, ncpus, cpu;
598 ncpus = cpumask_weight(mask);
599 resp_len = dr_cpu_size_response(ncpus);
600 resp = kzalloc(resp_len, GFP_KERNEL);
604 dr_cpu_init_response(resp, req_num, cp->handle,
605 resp_len, ncpus, mask,
606 DR_CPU_STAT_UNCONFIGURED);
608 for_each_cpu(cpu, mask) {
611 printk(KERN_INFO "ds-%llu: Shutting down cpu %d...\n",
615 dr_cpu_mark(resp, cpu, ncpus,
617 DR_CPU_STAT_CONFIGURED);
620 spin_lock_irqsave(&ds_lock, flags);
621 __ds_send(dp->lp, resp, resp_len);
622 spin_unlock_irqrestore(&ds_lock, flags);
629 static void dr_cpu_data(struct ds_info *dp, struct ds_cap_state *cp, void *buf,
632 struct ds_data *data = buf;
633 struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
634 u32 *cpu_list = (u32 *) (tag + 1);
635 u64 req_num = tag->req_num;
641 case DR_CPU_CONFIGURE:
642 case DR_CPU_UNCONFIGURE:
643 case DR_CPU_FORCE_UNCONFIGURE:
647 dr_cpu_send_error(dp, cp, data);
651 purge_dups(cpu_list, tag->num_records);
653 cpumask_clear(&mask);
654 for (i = 0; i < tag->num_records; i++) {
655 if (cpu_list[i] == CPU_SENTINEL)
658 if (cpu_list[i] < nr_cpu_ids)
659 cpumask_set_cpu(cpu_list[i], &mask);
662 if (tag->type == DR_CPU_CONFIGURE)
663 err = dr_cpu_configure(dp, cp, req_num, &mask);
665 err = dr_cpu_unconfigure(dp, cp, req_num, &mask);
668 dr_cpu_send_error(dp, cp, data);
670 #endif /* CONFIG_HOTPLUG_CPU */
675 #define DS_PRI_REQUEST 0x00
676 #define DS_PRI_DATA 0x01
677 #define DS_PRI_UPDATE 0x02
680 static void ds_pri_data(struct ds_info *dp,
681 struct ds_cap_state *cp,
684 struct ds_data *dpkt = buf;
685 struct ds_pri_msg *rp;
687 rp = (struct ds_pri_msg *) (dpkt + 1);
689 printk(KERN_INFO "ds-%llu: PRI REQ [%llx:%llx], len=%d\n",
690 dp->id, rp->req_num, rp->type, len);
695 #define DS_VAR_SET_REQ 0x00
696 #define DS_VAR_DELETE_REQ 0x01
697 #define DS_VAR_SET_RESP 0x02
698 #define DS_VAR_DELETE_RESP 0x03
701 struct ds_var_set_msg {
702 struct ds_var_hdr hdr;
703 char name_and_value[0];
706 struct ds_var_delete_msg {
707 struct ds_var_hdr hdr;
712 struct ds_var_hdr hdr;
714 #define DS_VAR_SUCCESS 0x00
715 #define DS_VAR_NO_SPACE 0x01
716 #define DS_VAR_INVALID_VAR 0x02
717 #define DS_VAR_INVALID_VAL 0x03
718 #define DS_VAR_NOT_PRESENT 0x04
721 static DEFINE_MUTEX(ds_var_mutex);
722 static int ds_var_doorbell;
723 static int ds_var_response;
725 static void ds_var_data(struct ds_info *dp,
726 struct ds_cap_state *cp,
729 struct ds_data *dpkt = buf;
730 struct ds_var_resp *rp;
732 rp = (struct ds_var_resp *) (dpkt + 1);
734 if (rp->hdr.type != DS_VAR_SET_RESP &&
735 rp->hdr.type != DS_VAR_DELETE_RESP)
738 ds_var_response = rp->result;
743 void ldom_set_var(const char *var, const char *value)
745 struct ds_cap_state *cp;
749 spin_lock_irqsave(&ds_lock, flags);
751 for (dp = ds_info_list; dp; dp = dp->next) {
752 struct ds_cap_state *tmp;
754 tmp = find_cap_by_string(dp, "var-config");
755 if (tmp && tmp->state == CAP_STATE_REGISTERED) {
761 for (dp = ds_info_list; dp; dp = dp->next) {
762 struct ds_cap_state *tmp;
764 tmp = find_cap_by_string(dp, "var-config-backup");
765 if (tmp && tmp->state == CAP_STATE_REGISTERED) {
771 spin_unlock_irqrestore(&ds_lock, flags);
777 struct ds_var_set_msg msg;
784 if (strlen(var) + strlen(value) + 2 >
785 sizeof(pkt) - sizeof(pkt.header)) {
787 "contents length: %zu, which more than max: %lu,"
788 "so could not set (%s) variable to (%s).\n",
789 strlen(var) + strlen(value) + 2,
790 sizeof(pkt) - sizeof(pkt.header), var, value);
794 memset(&pkt, 0, sizeof(pkt));
795 pkt.header.data.tag.type = DS_DATA;
796 pkt.header.data.handle = cp->handle;
797 pkt.header.msg.hdr.type = DS_VAR_SET_REQ;
798 base = p = &pkt.header.msg.name_and_value[0];
800 p += strlen(var) + 1;
802 p += strlen(value) + 1;
804 msg_len = (sizeof(struct ds_data) +
805 sizeof(struct ds_var_set_msg) +
807 msg_len = (msg_len + 3) & ~3;
808 pkt.header.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
810 mutex_lock(&ds_var_mutex);
812 spin_lock_irqsave(&ds_lock, flags);
814 ds_var_response = -1;
816 __ds_send(dp->lp, &pkt, msg_len);
817 spin_unlock_irqrestore(&ds_lock, flags);
820 while (ds_var_doorbell == 0) {
827 mutex_unlock(&ds_var_mutex);
829 if (ds_var_doorbell == 0 ||
830 ds_var_response != DS_VAR_SUCCESS)
831 printk(KERN_ERR "ds-%llu: var-config [%s:%s] "
832 "failed, response(%d).\n",
836 printk(KERN_ERR PFX "var-config not registered so "
837 "could not set (%s) variable to (%s).\n",
842 static char full_boot_str[256] __attribute__((aligned(32)));
843 static int reboot_data_supported;
845 void ldom_reboot(const char *boot_command)
847 /* Don't bother with any of this if the boot_command
850 if (boot_command && strlen(boot_command)) {
853 snprintf(full_boot_str, sizeof(full_boot_str), "boot %s",
855 len = strlen(full_boot_str);
857 if (reboot_data_supported) {
858 unsigned long ra = kimage_addr_to_ra(full_boot_str);
859 unsigned long hv_ret;
861 hv_ret = sun4v_reboot_data_set(ra, len);
862 if (hv_ret != HV_EOK)
863 pr_err("SUN4V: Unable to set reboot data "
864 "hv_ret=%lu\n", hv_ret);
866 ldom_set_var("reboot-command", full_boot_str);
872 void ldom_power_off(void)
877 static void ds_conn_reset(struct ds_info *dp)
879 printk(KERN_ERR "ds-%llu: ds_conn_reset() from %pf\n",
880 dp->id, __builtin_return_address(0));
883 static int register_services(struct ds_info *dp)
885 struct ldc_channel *lp = dp->lp;
888 for (i = 0; i < dp->num_ds_states; i++) {
890 struct ds_reg_req req;
893 struct ds_cap_state *cp = &dp->ds_states[i];
897 if (cp->state == CAP_STATE_REGISTERED)
900 new_count = sched_clock() & 0xffffffff;
901 cp->handle = ((u64) i << 32) | new_count;
903 msg_len = (sizeof(struct ds_reg_req) +
904 strlen(cp->service_id));
906 memset(&pbuf, 0, sizeof(pbuf));
907 pbuf.req.tag.type = DS_REG_REQ;
908 pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag));
909 pbuf.req.handle = cp->handle;
912 strcpy(pbuf.id_buf, cp->service_id);
914 err = __ds_send(lp, &pbuf, msg_len);
916 cp->state = CAP_STATE_REG_SENT;
921 static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt)
924 if (dp->hs_state == DS_HS_START) {
925 if (pkt->type != DS_INIT_ACK)
928 dp->hs_state = DS_HS_DONE;
930 return register_services(dp);
933 if (dp->hs_state != DS_HS_DONE)
936 if (pkt->type == DS_REG_ACK) {
937 struct ds_reg_ack *ap = (struct ds_reg_ack *) pkt;
938 struct ds_cap_state *cp = find_cap(dp, ap->handle);
941 printk(KERN_ERR "ds-%llu: REG ACK for unknown "
942 "handle %llx\n", dp->id, ap->handle);
945 printk(KERN_INFO "ds-%llu: Registered %s service.\n",
946 dp->id, cp->service_id);
947 cp->state = CAP_STATE_REGISTERED;
948 } else if (pkt->type == DS_REG_NACK) {
949 struct ds_reg_nack *np = (struct ds_reg_nack *) pkt;
950 struct ds_cap_state *cp = find_cap(dp, np->handle);
953 printk(KERN_ERR "ds-%llu: REG NACK for "
954 "unknown handle %llx\n",
958 cp->state = CAP_STATE_UNKNOWN;
968 static void __send_ds_nack(struct ds_info *dp, u64 handle)
970 struct ds_data_nack nack = {
973 .len = (sizeof(struct ds_data_nack) -
974 sizeof(struct ds_msg_tag)),
977 .result = DS_INV_HDL,
980 __ds_send(dp->lp, &nack, sizeof(nack));
983 static LIST_HEAD(ds_work_list);
984 static DECLARE_WAIT_QUEUE_HEAD(ds_wait);
986 struct ds_queue_entry {
987 struct list_head list;
994 static void process_ds_work(void)
996 struct ds_queue_entry *qp, *tmp;
1000 spin_lock_irqsave(&ds_lock, flags);
1001 list_splice_init(&ds_work_list, &todo);
1002 spin_unlock_irqrestore(&ds_lock, flags);
1004 list_for_each_entry_safe(qp, tmp, &todo, list) {
1005 struct ds_data *dpkt = (struct ds_data *) qp->req;
1006 struct ds_info *dp = qp->dp;
1007 struct ds_cap_state *cp = find_cap(dp, dpkt->handle);
1008 int req_len = qp->req_len;
1011 printk(KERN_ERR "ds-%llu: Data for unknown "
1013 dp->id, dpkt->handle);
1015 spin_lock_irqsave(&ds_lock, flags);
1016 __send_ds_nack(dp, dpkt->handle);
1017 spin_unlock_irqrestore(&ds_lock, flags);
1019 cp->data(dp, cp, dpkt, req_len);
1022 list_del(&qp->list);
1027 static int ds_thread(void *__unused)
1032 prepare_to_wait(&ds_wait, &wait, TASK_INTERRUPTIBLE);
1033 if (list_empty(&ds_work_list))
1035 finish_wait(&ds_wait, &wait);
1037 if (kthread_should_stop())
1046 static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len)
1048 struct ds_data *dpkt = (struct ds_data *) pkt;
1049 struct ds_queue_entry *qp;
1051 qp = kmalloc(sizeof(struct ds_queue_entry) + len, GFP_ATOMIC);
1053 __send_ds_nack(dp, dpkt->handle);
1056 memcpy(&qp->req, pkt, len);
1057 list_add_tail(&qp->list, &ds_work_list);
1063 static void ds_up(struct ds_info *dp)
1065 struct ldc_channel *lp = dp->lp;
1066 struct ds_ver_req req;
1069 req.tag.type = DS_INIT_REQ;
1070 req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag);
1074 err = __ds_send(lp, &req, sizeof(req));
1076 dp->hs_state = DS_HS_START;
1079 static void ds_reset(struct ds_info *dp)
1085 for (i = 0; i < dp->num_ds_states; i++) {
1086 struct ds_cap_state *cp = &dp->ds_states[i];
1088 cp->state = CAP_STATE_UNKNOWN;
1092 static void ds_event(void *arg, int event)
1094 struct ds_info *dp = arg;
1095 struct ldc_channel *lp = dp->lp;
1096 unsigned long flags;
1099 spin_lock_irqsave(&ds_lock, flags);
1101 if (event == LDC_EVENT_UP) {
1103 spin_unlock_irqrestore(&ds_lock, flags);
1107 if (event == LDC_EVENT_RESET) {
1109 spin_unlock_irqrestore(&ds_lock, flags);
1113 if (event != LDC_EVENT_DATA_READY) {
1114 printk(KERN_WARNING "ds-%llu: Unexpected LDC event %d\n",
1116 spin_unlock_irqrestore(&ds_lock, flags);
1122 struct ds_msg_tag *tag;
1124 err = ldc_read(lp, dp->rcv_buf, sizeof(*tag));
1126 if (unlikely(err < 0)) {
1127 if (err == -ECONNRESET)
1135 err = ldc_read(lp, tag + 1, tag->len);
1137 if (unlikely(err < 0)) {
1138 if (err == -ECONNRESET)
1145 if (tag->type < DS_DATA)
1146 err = ds_handshake(dp, dp->rcv_buf);
1148 err = ds_data(dp, dp->rcv_buf,
1149 sizeof(*tag) + err);
1150 if (err == -ECONNRESET)
1154 spin_unlock_irqrestore(&ds_lock, flags);
1157 static int ds_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1159 static int ds_version_printed;
1160 struct ldc_channel_config ds_cfg = {
1163 .mode = LDC_MODE_STREAM,
1165 struct mdesc_handle *hp;
1166 struct ldc_channel *lp;
1171 if (ds_version_printed++ == 0)
1172 printk(KERN_INFO "%s", version);
1174 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1180 val = mdesc_get_property(hp, vdev->mp, "id", NULL);
1185 dp->rcv_buf = kzalloc(4096, GFP_KERNEL);
1189 dp->rcv_buf_len = 4096;
1191 dp->ds_states = kmemdup(ds_states_template,
1192 sizeof(ds_states_template), GFP_KERNEL);
1194 goto out_free_rcv_buf;
1196 dp->num_ds_states = ARRAY_SIZE(ds_states_template);
1198 for (i = 0; i < dp->num_ds_states; i++)
1199 dp->ds_states[i].handle = ((u64)i << 32);
1201 ds_cfg.tx_irq = vdev->tx_irq;
1202 ds_cfg.rx_irq = vdev->rx_irq;
1204 lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp, "DS");
1207 goto out_free_ds_states;
1215 spin_lock_irq(&ds_lock);
1216 dp->next = ds_info_list;
1218 spin_unlock_irq(&ds_lock);
1226 kfree(dp->ds_states);
1238 static int ds_remove(struct vio_dev *vdev)
1243 static const struct vio_device_id ds_match[] = {
1245 .type = "domain-services-port",
1250 static struct vio_driver ds_driver = {
1251 .id_table = ds_match,
1253 .remove = ds_remove,
1257 static int __init ds_init(void)
1259 unsigned long hv_ret, major, minor;
1261 if (tlb_type == hypervisor) {
1262 hv_ret = sun4v_get_version(HV_GRP_REBOOT_DATA, &major, &minor);
1263 if (hv_ret == HV_EOK) {
1264 pr_info("SUN4V: Reboot data supported (maj=%lu,min=%lu).\n",
1266 reboot_data_supported = 1;
1269 kthread_run(ds_thread, NULL, "kldomd");
1271 return vio_register_driver(&ds_driver);
1274 fs_initcall(ds_init);