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 32static char version[] = 33 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; 34MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); 35MODULE_DESCRIPTION("Sun LDOM domain services driver"); 36MODULE_LICENSE("GPL"); 37MODULE_VERSION(DRV_MODULE_VERSION); 38 39struct 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 63struct ds_version { 64 __u16 major; 65 __u16 minor; 66}; 67 68struct ds_ver_req { 69 struct ds_msg_tag tag; 70 struct ds_version ver; 71}; 72 73struct ds_ver_ack { 74 struct ds_msg_tag tag; 75 __u16 minor; 76}; 77 78struct ds_ver_nack { 79 struct ds_msg_tag tag; 80 __u16 major; 81}; 82 83struct 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 91struct ds_reg_ack { 92 struct ds_msg_tag tag; 93 __u64 handle; 94 __u16 minor; 95}; 96 97struct ds_reg_nack { 98 struct ds_msg_tag tag; 99 __u64 handle; 100 __u16 major; 101}; 102 103struct ds_unreg_req { 104 struct ds_msg_tag tag; 105 __u64 handle; 106}; 107 108struct ds_unreg_ack { 109 struct ds_msg_tag tag; 110 __u64 handle; 111}; 112 113struct ds_unreg_nack { 114 struct ds_msg_tag tag; 115 __u64 handle; 116}; 117 118struct ds_data { 119 struct ds_msg_tag tag; 120 __u64 handle; 121}; 122 123struct ds_data_nack { 124 struct ds_msg_tag tag; 125 __u64 handle; 126 __u64 result; 127}; 128 129struct ds_info; 130struct 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 145static void md_update_data(struct ds_info *dp, struct ds_cap_state *cp, 146 void *buf, int len); 147static void domain_shutdown_data(struct ds_info *dp, 148 struct ds_cap_state *cp, 149 void *buf, int len); 150static void domain_panic_data(struct ds_info *dp, 151 struct ds_cap_state *cp, 152 void *buf, int len); 153#ifdef CONFIG_HOTPLUG_CPU 154static void dr_cpu_data(struct ds_info *dp, 155 struct ds_cap_state *cp, 156 void *buf, int len); 157#endif 158static void ds_pri_data(struct ds_info *dp, 159 struct ds_cap_state *cp, 160 void *buf, int len); 161static void ds_var_data(struct ds_info *dp, 162 struct ds_cap_state *cp, 163 void *buf, int len); 164 165static 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 198static DEFINE_SPINLOCK(ds_lock); 199 200struct 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 217static struct ds_info *ds_info_list; 218 219static 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 228static 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 242static 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 257static 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 269struct ds_md_update_req { 270 __u64 req_num; 271}; 272 273struct ds_md_update_res { 274 __u64 req_num; 275 __u32 result; 276}; 277 278static 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 306struct ds_shutdown_req { 307 __u64 req_num; 308 __u32 ms_delay; 309}; 310 311struct ds_shutdown_res { 312 __u64 req_num; 313 __u32 result; 314 char reason[1]; 315}; 316 317static 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 347struct ds_panic_req { 348 __u64 req_num; 349}; 350 351struct ds_panic_res { 352 __u64 req_num; 353 __u32 result; 354 char reason[1]; 355}; 356 357static 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 388struct 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 403struct 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 420static 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 446static 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 459static 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 477static 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 484static 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 512static 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 531static 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 588static 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 628static 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 671struct 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 679static 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 692struct 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 700struct ds_var_set_msg { 701 struct ds_var_hdr hdr; 702 char name_and_value[0]; 703}; 704 705struct ds_var_delete_msg { 706 struct ds_var_hdr hdr; 707 char name[0]; 708}; 709 710struct 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 720static DEFINE_MUTEX(ds_var_mutex); 721static int ds_var_doorbell; 722static int ds_var_response; 723 724static 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 742void 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 841static char full_boot_str[256] __attribute__((aligned(32))); 842static int reboot_data_supported; 843 844void 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 871void ldom_power_off(void) 872{ 873 sun4v_mach_exit(0); 874} 875 876static 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 882static 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 920static 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 962conn_reset: 963 ds_conn_reset(dp); 964 return -ECONNRESET; 965} 966 967static 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 982static LIST_HEAD(ds_work_list); 983static DECLARE_WAIT_QUEUE_HEAD(ds_wait); 984 985struct 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 993static 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 1026static 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 1045static 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 1062static 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 1078static 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 1091static 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 1156static int ds_probe(struct vio_dev *vdev, const struct vio_device_id *id) 1157{ 1158 static int ds_version_printed; 1159 struct ldc_channel_config ds_cfg = { 1160 .event = ds_event, 1161 .mtu = 4096, 1162 .mode = LDC_MODE_STREAM, 1163 }; 1164 struct mdesc_handle *hp; 1165 struct ldc_channel *lp; 1166 struct ds_info *dp; 1167 const u64 *val; 1168 int err, i; 1169 1170 if (ds_version_printed++ == 0) 1171 printk(KERN_INFO "%s", version); 1172 1173 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1174 err = -ENOMEM; 1175 if (!dp) 1176 goto out_err; 1177 1178 hp = mdesc_grab(); 1179 val = mdesc_get_property(hp, vdev->mp, "id", NULL); 1180 if (val) 1181 dp->id = *val; 1182 mdesc_release(hp); 1183 1184 dp->rcv_buf = kzalloc(4096, GFP_KERNEL); 1185 if (!dp->rcv_buf) 1186 goto out_free_dp; 1187 1188 dp->rcv_buf_len = 4096; 1189 1190 dp->ds_states = kmemdup(ds_states_template, 1191 sizeof(ds_states_template), GFP_KERNEL); 1192 if (!dp->ds_states) 1193 goto out_free_rcv_buf; 1194 1195 dp->num_ds_states = ARRAY_SIZE(ds_states_template); 1196 1197 for (i = 0; i < dp->num_ds_states; i++) 1198 dp->ds_states[i].handle = ((u64)i << 32); 1199 1200 ds_cfg.tx_irq = vdev->tx_irq; 1201 ds_cfg.rx_irq = vdev->rx_irq; 1202 1203 lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp, "DS"); 1204 if (IS_ERR(lp)) { 1205 err = PTR_ERR(lp); 1206 goto out_free_ds_states; 1207 } 1208 dp->lp = lp; 1209 1210 err = ldc_bind(lp); 1211 if (err) 1212 goto out_free_ldc; 1213 1214 spin_lock_irq(&ds_lock); 1215 dp->next = ds_info_list; 1216 ds_info_list = dp; 1217 spin_unlock_irq(&ds_lock); 1218 1219 return err; 1220 1221out_free_ldc: 1222 ldc_free(dp->lp); 1223 1224out_free_ds_states: 1225 kfree(dp->ds_states); 1226 1227out_free_rcv_buf: 1228 kfree(dp->rcv_buf); 1229 1230out_free_dp: 1231 kfree(dp); 1232 1233out_err: 1234 return err; 1235} 1236 1237static int ds_remove(struct vio_dev *vdev) 1238{ 1239 return 0; 1240} 1241 1242static const struct vio_device_id ds_match[] = { 1243 { 1244 .type = "domain-services-port", 1245 }, 1246 {}, 1247}; 1248 1249static struct vio_driver ds_driver = { 1250 .id_table = ds_match, 1251 .probe = ds_probe, 1252 .remove = ds_remove, 1253 .name = "ds", 1254}; 1255 1256static 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 1273fs_initcall(ds_init); 1274