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/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> 18 19 #include <asm/hypervisor.h> 20 #include <asm/ldc.h> 21 #include <asm/vio.h> 22 #include <asm/mdesc.h> 23 #include <asm/head.h> 24 #include <asm/irq.h> 25 26 #include "kernel.h" 27 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" 32 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); 39 40 struct ds_msg_tag { 41 __u32 type; 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 51 #define DS_DATA 0x09 52 #define DS_NACK 0x0a 53 54 __u32 len; 55 }; 56 57 /* Result codes */ 58 #define DS_OK 0x00 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 63 64 struct ds_version { 65 __u16 major; 66 __u16 minor; 67 }; 68 69 struct ds_ver_req { 70 struct ds_msg_tag tag; 71 struct ds_version ver; 72 }; 73 74 struct ds_ver_ack { 75 struct ds_msg_tag tag; 76 __u16 minor; 77 }; 78 79 struct ds_ver_nack { 80 struct ds_msg_tag tag; 81 __u16 major; 82 }; 83 84 struct ds_reg_req { 85 struct ds_msg_tag tag; 86 __u64 handle; 87 __u16 major; 88 __u16 minor; 89 char svc_id[0]; 90 }; 91 92 struct ds_reg_ack { 93 struct ds_msg_tag tag; 94 __u64 handle; 95 __u16 minor; 96 }; 97 98 struct ds_reg_nack { 99 struct ds_msg_tag tag; 100 __u64 handle; 101 __u16 major; 102 }; 103 104 struct ds_unreg_req { 105 struct ds_msg_tag tag; 106 __u64 handle; 107 }; 108 109 struct ds_unreg_ack { 110 struct ds_msg_tag tag; 111 __u64 handle; 112 }; 113 114 struct ds_unreg_nack { 115 struct ds_msg_tag tag; 116 __u64 handle; 117 }; 118 119 struct ds_data { 120 struct ds_msg_tag tag; 121 __u64 handle; 122 }; 123 124 struct ds_data_nack { 125 struct ds_msg_tag tag; 126 __u64 handle; 127 __u64 result; 128 }; 129 130 struct ds_info; 131 struct ds_cap_state { 132 __u64 handle; 133 134 void (*data)(struct ds_info *dp, 135 struct ds_cap_state *cp, 136 void *buf, int len); 137 138 const char *service_id; 139 140 u8 state; 141 #define CAP_STATE_UNKNOWN 0x00 142 #define CAP_STATE_REG_SENT 0x01 143 #define CAP_STATE_REGISTERED 0x02 144 }; 145 146 static void md_update_data(struct ds_info *dp, struct ds_cap_state *cp, 147 void *buf, int len); 148 static void domain_shutdown_data(struct ds_info *dp, 149 struct ds_cap_state *cp, 150 void *buf, int len); 151 static void domain_panic_data(struct ds_info *dp, 152 struct ds_cap_state *cp, 153 void *buf, int len); 154 #ifdef CONFIG_HOTPLUG_CPU 155 static void dr_cpu_data(struct ds_info *dp, 156 struct ds_cap_state *cp, 157 void *buf, int len); 158 #endif 159 static void ds_pri_data(struct ds_info *dp, 160 struct ds_cap_state *cp, 161 void *buf, int len); 162 static void ds_var_data(struct ds_info *dp, 163 struct ds_cap_state *cp, 164 void *buf, int len); 165 166 static struct ds_cap_state ds_states_template[] = { 167 { 168 .service_id = "md-update", 169 .data = md_update_data, 170 }, 171 { 172 .service_id = "domain-shutdown", 173 .data = domain_shutdown_data, 174 }, 175 { 176 .service_id = "domain-panic", 177 .data = domain_panic_data, 178 }, 179 #ifdef CONFIG_HOTPLUG_CPU 180 { 181 .service_id = "dr-cpu", 182 .data = dr_cpu_data, 183 }, 184 #endif 185 { 186 .service_id = "pri", 187 .data = ds_pri_data, 188 }, 189 { 190 .service_id = "var-config", 191 .data = ds_var_data, 192 }, 193 { 194 .service_id = "var-config-backup", 195 .data = ds_var_data, 196 }, 197 }; 198 199 static DEFINE_SPINLOCK(ds_lock); 200 201 struct ds_info { 202 struct ldc_channel *lp; 203 u8 hs_state; 204 #define DS_HS_START 0x01 205 #define DS_HS_DONE 0x02 206 207 u64 id; 208 209 void *rcv_buf; 210 int rcv_buf_len; 211 212 struct ds_cap_state *ds_states; 213 int num_ds_states; 214 215 struct ds_info *next; 216 }; 217 218 static struct ds_info *ds_info_list; 219 220 static struct ds_cap_state *find_cap(struct ds_info *dp, u64 handle) 221 { 222 unsigned int index = handle >> 32; 223 224 if (index >= dp->num_ds_states) 225 return NULL; 226 return &dp->ds_states[index]; 227 } 228 229 static struct ds_cap_state *find_cap_by_string(struct ds_info *dp, 230 const char *name) 231 { 232 int i; 233 234 for (i = 0; i < dp->num_ds_states; i++) { 235 if (strcmp(dp->ds_states[i].service_id, name)) 236 continue; 237 238 return &dp->ds_states[i]; 239 } 240 return NULL; 241 } 242 243 static int __ds_send(struct ldc_channel *lp, void *data, int len) 244 { 245 int err, limit = 1000; 246 247 err = -EINVAL; 248 while (limit-- > 0) { 249 err = ldc_write(lp, data, len); 250 if (!err || (err != -EAGAIN)) 251 break; 252 udelay(1); 253 } 254 255 return err; 256 } 257 258 static int ds_send(struct ldc_channel *lp, void *data, int len) 259 { 260 unsigned long flags; 261 int err; 262 263 spin_lock_irqsave(&ds_lock, flags); 264 err = __ds_send(lp, data, len); 265 spin_unlock_irqrestore(&ds_lock, flags); 266 267 return err; 268 } 269 270 struct ds_md_update_req { 271 __u64 req_num; 272 }; 273 274 struct ds_md_update_res { 275 __u64 req_num; 276 __u32 result; 277 }; 278 279 static void md_update_data(struct ds_info *dp, 280 struct ds_cap_state *cp, 281 void *buf, int len) 282 { 283 struct ldc_channel *lp = dp->lp; 284 struct ds_data *dpkt = buf; 285 struct ds_md_update_req *rp; 286 struct { 287 struct ds_data data; 288 struct ds_md_update_res res; 289 } pkt; 290 291 rp = (struct ds_md_update_req *) (dpkt + 1); 292 293 printk(KERN_INFO "ds-%llu: Machine description update.\n", dp->id); 294 295 mdesc_update(); 296 297 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; 303 304 ds_send(lp, &pkt, sizeof(pkt)); 305 } 306 307 struct ds_shutdown_req { 308 __u64 req_num; 309 __u32 ms_delay; 310 }; 311 312 struct ds_shutdown_res { 313 __u64 req_num; 314 __u32 result; 315 char reason[1]; 316 }; 317 318 static void domain_shutdown_data(struct ds_info *dp, 319 struct ds_cap_state *cp, 320 void *buf, int len) 321 { 322 struct ldc_channel *lp = dp->lp; 323 struct ds_data *dpkt = buf; 324 struct ds_shutdown_req *rp; 325 struct { 326 struct ds_data data; 327 struct ds_shutdown_res res; 328 } pkt; 329 330 rp = (struct ds_shutdown_req *) (dpkt + 1); 331 332 printk(KERN_ALERT "ds-%llu: Shutdown request from " 333 "LDOM manager received.\n", dp->id); 334 335 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; 342 343 ds_send(lp, &pkt, sizeof(pkt)); 344 345 orderly_poweroff(true); 346 } 347 348 struct ds_panic_req { 349 __u64 req_num; 350 }; 351 352 struct ds_panic_res { 353 __u64 req_num; 354 __u32 result; 355 char reason[1]; 356 }; 357 358 static void domain_panic_data(struct ds_info *dp, 359 struct ds_cap_state *cp, 360 void *buf, int len) 361 { 362 struct ldc_channel *lp = dp->lp; 363 struct ds_data *dpkt = buf; 364 struct ds_panic_req *rp; 365 struct { 366 struct ds_data data; 367 struct ds_panic_res res; 368 } pkt; 369 370 rp = (struct ds_panic_req *) (dpkt + 1); 371 372 printk(KERN_ALERT "ds-%llu: Panic request from " 373 "LDOM manager received.\n", dp->id); 374 375 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; 382 383 ds_send(lp, &pkt, sizeof(pkt)); 384 385 panic("PANIC requested by LDOM manager."); 386 } 387 388 #ifdef CONFIG_HOTPLUG_CPU 389 struct dr_cpu_tag { 390 __u64 req_num; 391 __u32 type; 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 396 397 /* Responses */ 398 #define DR_CPU_OK 0x6f 399 #define DR_CPU_ERROR 0x65 400 401 __u32 num_records; 402 }; 403 404 struct dr_cpu_resp_entry { 405 __u32 cpu; 406 __u32 result; 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 412 413 __u32 stat; 414 #define DR_CPU_STAT_NOT_PRESENT 0x00 415 #define DR_CPU_STAT_UNCONFIGURED 0x01 416 #define DR_CPU_STAT_CONFIGURED 0x02 417 418 __u32 str_off; 419 }; 420 421 static void __dr_cpu_send_error(struct ds_info *dp, 422 struct ds_cap_state *cp, 423 struct ds_data *data) 424 { 425 struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1); 426 struct { 427 struct ds_data data; 428 struct dr_cpu_tag tag; 429 } pkt; 430 int msg_len; 431 432 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; 438 439 msg_len = (sizeof(struct ds_data) + 440 sizeof(struct dr_cpu_tag)); 441 442 pkt.data.tag.len = msg_len - sizeof(struct ds_msg_tag); 443 444 __ds_send(dp->lp, &pkt, msg_len); 445 } 446 447 static void dr_cpu_send_error(struct ds_info *dp, 448 struct ds_cap_state *cp, 449 struct ds_data *data) 450 { 451 unsigned long flags; 452 453 spin_lock_irqsave(&ds_lock, flags); 454 __dr_cpu_send_error(dp, cp, data); 455 spin_unlock_irqrestore(&ds_lock, flags); 456 } 457 458 #define CPU_SENTINEL 0xffffffff 459 460 static void purge_dups(u32 *list, u32 num_ents) 461 { 462 unsigned int i; 463 464 for (i = 0; i < num_ents; i++) { 465 u32 cpu = list[i]; 466 unsigned int j; 467 468 if (cpu == CPU_SENTINEL) 469 continue; 470 471 for (j = i + 1; j < num_ents; j++) { 472 if (list[j] == cpu) 473 list[j] = CPU_SENTINEL; 474 } 475 } 476 } 477 478 static int dr_cpu_size_response(int ncpus) 479 { 480 return (sizeof(struct ds_data) + 481 sizeof(struct dr_cpu_tag) + 482 (sizeof(struct dr_cpu_resp_entry) * ncpus)); 483 } 484 485 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) 488 { 489 struct dr_cpu_resp_entry *ent; 490 struct dr_cpu_tag *tag; 491 int i, cpu; 492 493 tag = (struct dr_cpu_tag *) (resp + 1); 494 ent = (struct dr_cpu_resp_entry *) (tag + 1); 495 496 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; 502 503 i = 0; 504 for_each_cpu(cpu, mask) { 505 ent[i].cpu = cpu; 506 ent[i].result = DR_CPU_RES_OK; 507 ent[i].stat = default_stat; 508 i++; 509 } 510 BUG_ON(i != ncpus); 511 } 512 513 static void dr_cpu_mark(struct ds_data *resp, int cpu, int ncpus, 514 u32 res, u32 stat) 515 { 516 struct dr_cpu_resp_entry *ent; 517 struct dr_cpu_tag *tag; 518 int i; 519 520 tag = (struct dr_cpu_tag *) (resp + 1); 521 ent = (struct dr_cpu_resp_entry *) (tag + 1); 522 523 for (i = 0; i < ncpus; i++) { 524 if (ent[i].cpu != cpu) 525 continue; 526 ent[i].result = res; 527 ent[i].stat = stat; 528 break; 529 } 530 } 531 532 static int dr_cpu_configure(struct ds_info *dp, struct ds_cap_state *cp, 533 u64 req_num, cpumask_t *mask) 534 { 535 struct ds_data *resp; 536 int resp_len, ncpus, cpu; 537 unsigned long flags; 538 539 ncpus = cpumask_weight(mask); 540 resp_len = dr_cpu_size_response(ncpus); 541 resp = kzalloc(resp_len, GFP_KERNEL); 542 if (!resp) 543 return -ENOMEM; 544 545 dr_cpu_init_response(resp, req_num, cp->handle, 546 resp_len, ncpus, mask, 547 DR_CPU_STAT_CONFIGURED); 548 549 mdesc_populate_present_mask(mask); 550 mdesc_fill_in_cpu_data(mask); 551 552 for_each_cpu(cpu, mask) { 553 int err; 554 555 printk(KERN_INFO "ds-%llu: Starting cpu %d...\n", 556 dp->id, cpu); 557 err = cpu_up(cpu); 558 if (err) { 559 __u32 res = DR_CPU_RES_FAILURE; 560 __u32 stat = DR_CPU_STAT_UNCONFIGURED; 561 562 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; 569 } 570 571 printk(KERN_INFO "ds-%llu: CPU startup failed err=%d\n", 572 dp->id, err); 573 dr_cpu_mark(resp, cpu, ncpus, res, stat); 574 } 575 } 576 577 spin_lock_irqsave(&ds_lock, flags); 578 __ds_send(dp->lp, resp, resp_len); 579 spin_unlock_irqrestore(&ds_lock, flags); 580 581 kfree(resp); 582 583 /* Redistribute IRQs, taking into account the new cpus. */ 584 fixup_irqs(); 585 586 return 0; 587 } 588 589 static int dr_cpu_unconfigure(struct ds_info *dp, 590 struct ds_cap_state *cp, 591 u64 req_num, 592 cpumask_t *mask) 593 { 594 struct ds_data *resp; 595 int resp_len, ncpus, cpu; 596 unsigned long flags; 597 598 ncpus = cpumask_weight(mask); 599 resp_len = dr_cpu_size_response(ncpus); 600 resp = kzalloc(resp_len, GFP_KERNEL); 601 if (!resp) 602 return -ENOMEM; 603 604 dr_cpu_init_response(resp, req_num, cp->handle, 605 resp_len, ncpus, mask, 606 DR_CPU_STAT_UNCONFIGURED); 607 608 for_each_cpu(cpu, mask) { 609 int err; 610 611 printk(KERN_INFO "ds-%llu: Shutting down cpu %d...\n", 612 dp->id, cpu); 613 err = cpu_down(cpu); 614 if (err) 615 dr_cpu_mark(resp, cpu, ncpus, 616 DR_CPU_RES_FAILURE, 617 DR_CPU_STAT_CONFIGURED); 618 } 619 620 spin_lock_irqsave(&ds_lock, flags); 621 __ds_send(dp->lp, resp, resp_len); 622 spin_unlock_irqrestore(&ds_lock, flags); 623 624 kfree(resp); 625 626 return 0; 627 } 628 629 static void dr_cpu_data(struct ds_info *dp, struct ds_cap_state *cp, void *buf, 630 int len) 631 { 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; 636 cpumask_t mask; 637 unsigned int i; 638 int err; 639 640 switch (tag->type) { 641 case DR_CPU_CONFIGURE: 642 case DR_CPU_UNCONFIGURE: 643 case DR_CPU_FORCE_UNCONFIGURE: 644 break; 645 646 default: 647 dr_cpu_send_error(dp, cp, data); 648 return; 649 } 650 651 purge_dups(cpu_list, tag->num_records); 652 653 cpumask_clear(&mask); 654 for (i = 0; i < tag->num_records; i++) { 655 if (cpu_list[i] == CPU_SENTINEL) 656 continue; 657 658 if (cpu_list[i] < nr_cpu_ids) 659 cpumask_set_cpu(cpu_list[i], &mask); 660 } 661 662 if (tag->type == DR_CPU_CONFIGURE) 663 err = dr_cpu_configure(dp, cp, req_num, &mask); 664 else 665 err = dr_cpu_unconfigure(dp, cp, req_num, &mask); 666 667 if (err) 668 dr_cpu_send_error(dp, cp, data); 669 } 670 #endif /* CONFIG_HOTPLUG_CPU */ 671 672 struct ds_pri_msg { 673 __u64 req_num; 674 __u64 type; 675 #define DS_PRI_REQUEST 0x00 676 #define DS_PRI_DATA 0x01 677 #define DS_PRI_UPDATE 0x02 678 }; 679 680 static void ds_pri_data(struct ds_info *dp, 681 struct ds_cap_state *cp, 682 void *buf, int len) 683 { 684 struct ds_data *dpkt = buf; 685 struct ds_pri_msg *rp; 686 687 rp = (struct ds_pri_msg *) (dpkt + 1); 688 689 printk(KERN_INFO "ds-%llu: PRI REQ [%llx:%llx], len=%d\n", 690 dp->id, rp->req_num, rp->type, len); 691 } 692 693 struct ds_var_hdr { 694 __u32 type; 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 699 }; 700 701 struct ds_var_set_msg { 702 struct ds_var_hdr hdr; 703 char name_and_value[0]; 704 }; 705 706 struct ds_var_delete_msg { 707 struct ds_var_hdr hdr; 708 char name[0]; 709 }; 710 711 struct ds_var_resp { 712 struct ds_var_hdr hdr; 713 __u32 result; 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 719 }; 720 721 static DEFINE_MUTEX(ds_var_mutex); 722 static int ds_var_doorbell; 723 static int ds_var_response; 724 725 static void ds_var_data(struct ds_info *dp, 726 struct ds_cap_state *cp, 727 void *buf, int len) 728 { 729 struct ds_data *dpkt = buf; 730 struct ds_var_resp *rp; 731 732 rp = (struct ds_var_resp *) (dpkt + 1); 733 734 if (rp->hdr.type != DS_VAR_SET_RESP && 735 rp->hdr.type != DS_VAR_DELETE_RESP) 736 return; 737 738 ds_var_response = rp->result; 739 wmb(); 740 ds_var_doorbell = 1; 741 } 742 743 void ldom_set_var(const char *var, const char *value) 744 { 745 struct ds_cap_state *cp; 746 struct ds_info *dp; 747 unsigned long flags; 748 749 spin_lock_irqsave(&ds_lock, flags); 750 cp = NULL; 751 for (dp = ds_info_list; dp; dp = dp->next) { 752 struct ds_cap_state *tmp; 753 754 tmp = find_cap_by_string(dp, "var-config"); 755 if (tmp && tmp->state == CAP_STATE_REGISTERED) { 756 cp = tmp; 757 break; 758 } 759 } 760 if (!cp) { 761 for (dp = ds_info_list; dp; dp = dp->next) { 762 struct ds_cap_state *tmp; 763 764 tmp = find_cap_by_string(dp, "var-config-backup"); 765 if (tmp && tmp->state == CAP_STATE_REGISTERED) { 766 cp = tmp; 767 break; 768 } 769 } 770 } 771 spin_unlock_irqrestore(&ds_lock, flags); 772 773 if (cp) { 774 union { 775 struct { 776 struct ds_data data; 777 struct ds_var_set_msg msg; 778 } header; 779 char all[512]; 780 } pkt; 781 char *base, *p; 782 int msg_len, loops; 783 784 if (strlen(var) + strlen(value) + 2 > 785 sizeof(pkt) - sizeof(pkt.header)) { 786 printk(KERN_ERR PFX 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); 791 return; 792 } 793 794 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]; 799 strcpy(p, var); 800 p += strlen(var) + 1; 801 strcpy(p, value); 802 p += strlen(value) + 1; 803 804 msg_len = (sizeof(struct ds_data) + 805 sizeof(struct ds_var_set_msg) + 806 (p - base)); 807 msg_len = (msg_len + 3) & ~3; 808 pkt.header.data.tag.len = msg_len - sizeof(struct ds_msg_tag); 809 810 mutex_lock(&ds_var_mutex); 811 812 spin_lock_irqsave(&ds_lock, flags); 813 ds_var_doorbell = 0; 814 ds_var_response = -1; 815 816 __ds_send(dp->lp, &pkt, msg_len); 817 spin_unlock_irqrestore(&ds_lock, flags); 818 819 loops = 1000; 820 while (ds_var_doorbell == 0) { 821 if (loops-- < 0) 822 break; 823 barrier(); 824 udelay(100); 825 } 826 827 mutex_unlock(&ds_var_mutex); 828 829 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", 833 dp->id, var, value, 834 ds_var_response); 835 } else { 836 printk(KERN_ERR PFX "var-config not registered so " 837 "could not set (%s) variable to (%s).\n", 838 var, value); 839 } 840 } 841 842 static char full_boot_str[256] __attribute__((aligned(32))); 843 static int reboot_data_supported; 844 845 void ldom_reboot(const char *boot_command) 846 { 847 /* Don't bother with any of this if the boot_command 848 * is empty. 849 */ 850 if (boot_command && strlen(boot_command)) { 851 unsigned long len; 852 853 snprintf(full_boot_str, sizeof(full_boot_str), "boot %s", 854 boot_command); 855 len = strlen(full_boot_str); 856 857 if (reboot_data_supported) { 858 unsigned long ra = kimage_addr_to_ra(full_boot_str); 859 unsigned long hv_ret; 860 861 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); 865 } else { 866 ldom_set_var("reboot-command", full_boot_str); 867 } 868 } 869 sun4v_mach_sir(); 870 } 871 872 void ldom_power_off(void) 873 { 874 sun4v_mach_exit(0); 875 } 876 877 static void ds_conn_reset(struct ds_info *dp) 878 { 879 printk(KERN_ERR "ds-%llu: ds_conn_reset() from %pf\n", 880 dp->id, __builtin_return_address(0)); 881 } 882 883 static int register_services(struct ds_info *dp) 884 { 885 struct ldc_channel *lp = dp->lp; 886 int i; 887 888 for (i = 0; i < dp->num_ds_states; i++) { 889 struct { 890 struct ds_reg_req req; 891 u8 id_buf[256]; 892 } pbuf; 893 struct ds_cap_state *cp = &dp->ds_states[i]; 894 int err, msg_len; 895 u64 new_count; 896 897 if (cp->state == CAP_STATE_REGISTERED) 898 continue; 899 900 new_count = sched_clock() & 0xffffffff; 901 cp->handle = ((u64) i << 32) | new_count; 902 903 msg_len = (sizeof(struct ds_reg_req) + 904 strlen(cp->service_id)); 905 906 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; 910 pbuf.req.major = 1; 911 pbuf.req.minor = 0; 912 strcpy(pbuf.id_buf, cp->service_id); 913 914 err = __ds_send(lp, &pbuf, msg_len); 915 if (err > 0) 916 cp->state = CAP_STATE_REG_SENT; 917 } 918 return 0; 919 } 920 921 static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt) 922 { 923 924 if (dp->hs_state == DS_HS_START) { 925 if (pkt->type != DS_INIT_ACK) 926 goto conn_reset; 927 928 dp->hs_state = DS_HS_DONE; 929 930 return register_services(dp); 931 } 932 933 if (dp->hs_state != DS_HS_DONE) 934 goto conn_reset; 935 936 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); 939 940 if (!cp) { 941 printk(KERN_ERR "ds-%llu: REG ACK for unknown " 942 "handle %llx\n", dp->id, ap->handle); 943 return 0; 944 } 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); 951 952 if (!cp) { 953 printk(KERN_ERR "ds-%llu: REG NACK for " 954 "unknown handle %llx\n", 955 dp->id, np->handle); 956 return 0; 957 } 958 cp->state = CAP_STATE_UNKNOWN; 959 } 960 961 return 0; 962 963 conn_reset: 964 ds_conn_reset(dp); 965 return -ECONNRESET; 966 } 967 968 static void __send_ds_nack(struct ds_info *dp, u64 handle) 969 { 970 struct ds_data_nack nack = { 971 .tag = { 972 .type = DS_NACK, 973 .len = (sizeof(struct ds_data_nack) - 974 sizeof(struct ds_msg_tag)), 975 }, 976 .handle = handle, 977 .result = DS_INV_HDL, 978 }; 979 980 __ds_send(dp->lp, &nack, sizeof(nack)); 981 } 982 983 static LIST_HEAD(ds_work_list); 984 static DECLARE_WAIT_QUEUE_HEAD(ds_wait); 985 986 struct ds_queue_entry { 987 struct list_head list; 988 struct ds_info *dp; 989 int req_len; 990 int __pad; 991 u64 req[0]; 992 }; 993 994 static void process_ds_work(void) 995 { 996 struct ds_queue_entry *qp, *tmp; 997 unsigned long flags; 998 LIST_HEAD(todo); 999 1000 spin_lock_irqsave(&ds_lock, flags); 1001 list_splice_init(&ds_work_list, &todo); 1002 spin_unlock_irqrestore(&ds_lock, flags); 1003 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; 1009 1010 if (!cp) { 1011 printk(KERN_ERR "ds-%llu: Data for unknown " 1012 "handle %llu\n", 1013 dp->id, dpkt->handle); 1014 1015 spin_lock_irqsave(&ds_lock, flags); 1016 __send_ds_nack(dp, dpkt->handle); 1017 spin_unlock_irqrestore(&ds_lock, flags); 1018 } else { 1019 cp->data(dp, cp, dpkt, req_len); 1020 } 1021 1022 list_del(&qp->list); 1023 kfree(qp); 1024 } 1025 } 1026 1027 static int ds_thread(void *__unused) 1028 { 1029 DEFINE_WAIT(wait); 1030 1031 while (1) { 1032 prepare_to_wait(&ds_wait, &wait, TASK_INTERRUPTIBLE); 1033 if (list_empty(&ds_work_list)) 1034 schedule(); 1035 finish_wait(&ds_wait, &wait); 1036 1037 if (kthread_should_stop()) 1038 break; 1039 1040 process_ds_work(); 1041 } 1042 1043 return 0; 1044 } 1045 1046 static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len) 1047 { 1048 struct ds_data *dpkt = (struct ds_data *) pkt; 1049 struct ds_queue_entry *qp; 1050 1051 qp = kmalloc(sizeof(struct ds_queue_entry) + len, GFP_ATOMIC); 1052 if (!qp) { 1053 __send_ds_nack(dp, dpkt->handle); 1054 } else { 1055 qp->dp = dp; 1056 memcpy(&qp->req, pkt, len); 1057 list_add_tail(&qp->list, &ds_work_list); 1058 wake_up(&ds_wait); 1059 } 1060 return 0; 1061 } 1062 1063 static void ds_up(struct ds_info *dp) 1064 { 1065 struct ldc_channel *lp = dp->lp; 1066 struct ds_ver_req req; 1067 int err; 1068 1069 req.tag.type = DS_INIT_REQ; 1070 req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag); 1071 req.ver.major = 1; 1072 req.ver.minor = 0; 1073 1074 err = __ds_send(lp, &req, sizeof(req)); 1075 if (err > 0) 1076 dp->hs_state = DS_HS_START; 1077 } 1078 1079 static void ds_reset(struct ds_info *dp) 1080 { 1081 int i; 1082 1083 dp->hs_state = 0; 1084 1085 for (i = 0; i < dp->num_ds_states; i++) { 1086 struct ds_cap_state *cp = &dp->ds_states[i]; 1087 1088 cp->state = CAP_STATE_UNKNOWN; 1089 } 1090 } 1091 1092 static void ds_event(void *arg, int event) 1093 { 1094 struct ds_info *dp = arg; 1095 struct ldc_channel *lp = dp->lp; 1096 unsigned long flags; 1097 int err; 1098 1099 spin_lock_irqsave(&ds_lock, flags); 1100 1101 if (event == LDC_EVENT_UP) { 1102 ds_up(dp); 1103 spin_unlock_irqrestore(&ds_lock, flags); 1104 return; 1105 } 1106 1107 if (event == LDC_EVENT_RESET) { 1108 ds_reset(dp); 1109 spin_unlock_irqrestore(&ds_lock, flags); 1110 return; 1111 } 1112 1113 if (event != LDC_EVENT_DATA_READY) { 1114 printk(KERN_WARNING "ds-%llu: Unexpected LDC event %d\n", 1115 dp->id, event); 1116 spin_unlock_irqrestore(&ds_lock, flags); 1117 return; 1118 } 1119 1120 err = 0; 1121 while (1) { 1122 struct ds_msg_tag *tag; 1123 1124 err = ldc_read(lp, dp->rcv_buf, sizeof(*tag)); 1125 1126 if (unlikely(err < 0)) { 1127 if (err == -ECONNRESET) 1128 ds_conn_reset(dp); 1129 break; 1130 } 1131 if (err == 0) 1132 break; 1133 1134 tag = dp->rcv_buf; 1135 err = ldc_read(lp, tag + 1, tag->len); 1136 1137 if (unlikely(err < 0)) { 1138 if (err == -ECONNRESET) 1139 ds_conn_reset(dp); 1140 break; 1141 } 1142 if (err < tag->len) 1143 break; 1144 1145 if (tag->type < DS_DATA) 1146 err = ds_handshake(dp, dp->rcv_buf); 1147 else 1148 err = ds_data(dp, dp->rcv_buf, 1149 sizeof(*tag) + err); 1150 if (err == -ECONNRESET) 1151 break; 1152 } 1153 1154 spin_unlock_irqrestore(&ds_lock, flags); 1155 } 1156 1157 static int ds_probe(struct vio_dev *vdev, const struct vio_device_id *id) 1158 { 1159 static int ds_version_printed; 1160 struct ldc_channel_config ds_cfg = { 1161 .event = ds_event, 1162 .mtu = 4096, 1163 .mode = LDC_MODE_STREAM, 1164 }; 1165 struct mdesc_handle *hp; 1166 struct ldc_channel *lp; 1167 struct ds_info *dp; 1168 const u64 *val; 1169 int err, i; 1170 1171 if (ds_version_printed++ == 0) 1172 printk(KERN_INFO "%s", version); 1173 1174 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1175 err = -ENOMEM; 1176 if (!dp) 1177 goto out_err; 1178 1179 hp = mdesc_grab(); 1180 val = mdesc_get_property(hp, vdev->mp, "id", NULL); 1181 if (val) 1182 dp->id = *val; 1183 mdesc_release(hp); 1184 1185 dp->rcv_buf = kzalloc(4096, GFP_KERNEL); 1186 if (!dp->rcv_buf) 1187 goto out_free_dp; 1188 1189 dp->rcv_buf_len = 4096; 1190 1191 dp->ds_states = kmemdup(ds_states_template, 1192 sizeof(ds_states_template), GFP_KERNEL); 1193 if (!dp->ds_states) 1194 goto out_free_rcv_buf; 1195 1196 dp->num_ds_states = ARRAY_SIZE(ds_states_template); 1197 1198 for (i = 0; i < dp->num_ds_states; i++) 1199 dp->ds_states[i].handle = ((u64)i << 32); 1200 1201 ds_cfg.tx_irq = vdev->tx_irq; 1202 ds_cfg.rx_irq = vdev->rx_irq; 1203 1204 lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp, "DS"); 1205 if (IS_ERR(lp)) { 1206 err = PTR_ERR(lp); 1207 goto out_free_ds_states; 1208 } 1209 dp->lp = lp; 1210 1211 err = ldc_bind(lp); 1212 if (err) 1213 goto out_free_ldc; 1214 1215 spin_lock_irq(&ds_lock); 1216 dp->next = ds_info_list; 1217 ds_info_list = dp; 1218 spin_unlock_irq(&ds_lock); 1219 1220 return err; 1221 1222 out_free_ldc: 1223 ldc_free(dp->lp); 1224 1225 out_free_ds_states: 1226 kfree(dp->ds_states); 1227 1228 out_free_rcv_buf: 1229 kfree(dp->rcv_buf); 1230 1231 out_free_dp: 1232 kfree(dp); 1233 1234 out_err: 1235 return err; 1236 } 1237 1238 static int ds_remove(struct vio_dev *vdev) 1239 { 1240 return 0; 1241 } 1242 1243 static const struct vio_device_id ds_match[] = { 1244 { 1245 .type = "domain-services-port", 1246 }, 1247 {}, 1248 }; 1249 1250 static struct vio_driver ds_driver = { 1251 .id_table = ds_match, 1252 .probe = ds_probe, 1253 .remove = ds_remove, 1254 .name = "ds", 1255 }; 1256 1257 static int __init ds_init(void) 1258 { 1259 unsigned long hv_ret, major, minor; 1260 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", 1265 major, minor); 1266 reboot_data_supported = 1; 1267 } 1268 } 1269 kthread_run(ds_thread, NULL, "kldomd"); 1270 1271 return vio_register_driver(&ds_driver); 1272 } 1273 1274 fs_initcall(ds_init); 1275