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 if (strlen(var) + strlen(value) + 2 > 787 sizeof(pkt) - sizeof(pkt.header)) { 788 printk(KERN_ERR PFX 789 "contents length: %zu, which more than max: %lu," 790 "so could not set (%s) variable to (%s).\n", 791 strlen(var) + strlen(value) + 2, 792 sizeof(pkt) - sizeof(pkt.header), var, value); 793 return; 794 } 795 796 memset(&pkt, 0, sizeof(pkt)); 797 pkt.header.data.tag.type = DS_DATA; 798 pkt.header.data.handle = cp->handle; 799 pkt.header.msg.hdr.type = DS_VAR_SET_REQ; 800 base = p = &pkt.header.msg.name_and_value[0]; 801 strcpy(p, var); 802 p += strlen(var) + 1; 803 strcpy(p, value); 804 p += strlen(value) + 1; 805 806 msg_len = (sizeof(struct ds_data) + 807 sizeof(struct ds_var_set_msg) + 808 (p - base)); 809 msg_len = (msg_len + 3) & ~3; 810 pkt.header.data.tag.len = msg_len - sizeof(struct ds_msg_tag); 811 812 mutex_lock(&ds_var_mutex); 813 814 spin_lock_irqsave(&ds_lock, flags); 815 ds_var_doorbell = 0; 816 ds_var_response = -1; 817 818 __ds_send(dp->lp, &pkt, msg_len); 819 spin_unlock_irqrestore(&ds_lock, flags); 820 821 loops = 1000; 822 while (ds_var_doorbell == 0) { 823 if (loops-- < 0) 824 break; 825 barrier(); 826 udelay(100); 827 } 828 829 mutex_unlock(&ds_var_mutex); 830 831 if (ds_var_doorbell == 0 || 832 ds_var_response != DS_VAR_SUCCESS) 833 printk(KERN_ERR "ds-%llu: var-config [%s:%s] " 834 "failed, response(%d).\n", 835 dp->id, var, value, 836 ds_var_response); 837 } else { 838 printk(KERN_ERR PFX "var-config not registered so " 839 "could not set (%s) variable to (%s).\n", 840 var, value); 841 } 842 } 843 844 static char full_boot_str[256] __attribute__((aligned(32))); 845 static int reboot_data_supported; 846 847 void ldom_reboot(const char *boot_command) 848 { 849 /* Don't bother with any of this if the boot_command 850 * is empty. 851 */ 852 if (boot_command && strlen(boot_command)) { 853 unsigned long len; 854 855 strcpy(full_boot_str, "boot "); 856 strlcpy(full_boot_str + strlen("boot "), boot_command, 857 sizeof(full_boot_str + strlen("boot "))); 858 len = strlen(full_boot_str); 859 860 if (reboot_data_supported) { 861 unsigned long ra = kimage_addr_to_ra(full_boot_str); 862 unsigned long hv_ret; 863 864 hv_ret = sun4v_reboot_data_set(ra, len); 865 if (hv_ret != HV_EOK) 866 pr_err("SUN4V: Unable to set reboot data " 867 "hv_ret=%lu\n", hv_ret); 868 } else { 869 ldom_set_var("reboot-command", full_boot_str); 870 } 871 } 872 sun4v_mach_sir(); 873 } 874 875 void ldom_power_off(void) 876 { 877 sun4v_mach_exit(0); 878 } 879 880 static void ds_conn_reset(struct ds_info *dp) 881 { 882 printk(KERN_ERR "ds-%llu: ds_conn_reset() from %pf\n", 883 dp->id, __builtin_return_address(0)); 884 } 885 886 static int register_services(struct ds_info *dp) 887 { 888 struct ldc_channel *lp = dp->lp; 889 int i; 890 891 for (i = 0; i < dp->num_ds_states; i++) { 892 struct { 893 struct ds_reg_req req; 894 u8 id_buf[256]; 895 } pbuf; 896 struct ds_cap_state *cp = &dp->ds_states[i]; 897 int err, msg_len; 898 u64 new_count; 899 900 if (cp->state == CAP_STATE_REGISTERED) 901 continue; 902 903 new_count = sched_clock() & 0xffffffff; 904 cp->handle = ((u64) i << 32) | new_count; 905 906 msg_len = (sizeof(struct ds_reg_req) + 907 strlen(cp->service_id)); 908 909 memset(&pbuf, 0, sizeof(pbuf)); 910 pbuf.req.tag.type = DS_REG_REQ; 911 pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag)); 912 pbuf.req.handle = cp->handle; 913 pbuf.req.major = 1; 914 pbuf.req.minor = 0; 915 strcpy(pbuf.req.svc_id, cp->service_id); 916 917 err = __ds_send(lp, &pbuf, msg_len); 918 if (err > 0) 919 cp->state = CAP_STATE_REG_SENT; 920 } 921 return 0; 922 } 923 924 static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt) 925 { 926 927 if (dp->hs_state == DS_HS_START) { 928 if (pkt->type != DS_INIT_ACK) 929 goto conn_reset; 930 931 dp->hs_state = DS_HS_DONE; 932 933 return register_services(dp); 934 } 935 936 if (dp->hs_state != DS_HS_DONE) 937 goto conn_reset; 938 939 if (pkt->type == DS_REG_ACK) { 940 struct ds_reg_ack *ap = (struct ds_reg_ack *) pkt; 941 struct ds_cap_state *cp = find_cap(dp, ap->handle); 942 943 if (!cp) { 944 printk(KERN_ERR "ds-%llu: REG ACK for unknown " 945 "handle %llx\n", dp->id, ap->handle); 946 return 0; 947 } 948 printk(KERN_INFO "ds-%llu: Registered %s service.\n", 949 dp->id, cp->service_id); 950 cp->state = CAP_STATE_REGISTERED; 951 } else if (pkt->type == DS_REG_NACK) { 952 struct ds_reg_nack *np = (struct ds_reg_nack *) pkt; 953 struct ds_cap_state *cp = find_cap(dp, np->handle); 954 955 if (!cp) { 956 printk(KERN_ERR "ds-%llu: REG NACK for " 957 "unknown handle %llx\n", 958 dp->id, np->handle); 959 return 0; 960 } 961 cp->state = CAP_STATE_UNKNOWN; 962 } 963 964 return 0; 965 966 conn_reset: 967 ds_conn_reset(dp); 968 return -ECONNRESET; 969 } 970 971 static void __send_ds_nack(struct ds_info *dp, u64 handle) 972 { 973 struct ds_data_nack nack = { 974 .tag = { 975 .type = DS_NACK, 976 .len = (sizeof(struct ds_data_nack) - 977 sizeof(struct ds_msg_tag)), 978 }, 979 .handle = handle, 980 .result = DS_INV_HDL, 981 }; 982 983 __ds_send(dp->lp, &nack, sizeof(nack)); 984 } 985 986 static LIST_HEAD(ds_work_list); 987 static DECLARE_WAIT_QUEUE_HEAD(ds_wait); 988 989 struct ds_queue_entry { 990 struct list_head list; 991 struct ds_info *dp; 992 int req_len; 993 int __pad; 994 u64 req[0]; 995 }; 996 997 static void process_ds_work(void) 998 { 999 struct ds_queue_entry *qp, *tmp; 1000 unsigned long flags; 1001 LIST_HEAD(todo); 1002 1003 spin_lock_irqsave(&ds_lock, flags); 1004 list_splice_init(&ds_work_list, &todo); 1005 spin_unlock_irqrestore(&ds_lock, flags); 1006 1007 list_for_each_entry_safe(qp, tmp, &todo, list) { 1008 struct ds_data *dpkt = (struct ds_data *) qp->req; 1009 struct ds_info *dp = qp->dp; 1010 struct ds_cap_state *cp = find_cap(dp, dpkt->handle); 1011 int req_len = qp->req_len; 1012 1013 if (!cp) { 1014 printk(KERN_ERR "ds-%llu: Data for unknown " 1015 "handle %llu\n", 1016 dp->id, dpkt->handle); 1017 1018 spin_lock_irqsave(&ds_lock, flags); 1019 __send_ds_nack(dp, dpkt->handle); 1020 spin_unlock_irqrestore(&ds_lock, flags); 1021 } else { 1022 cp->data(dp, cp, dpkt, req_len); 1023 } 1024 1025 list_del(&qp->list); 1026 kfree(qp); 1027 } 1028 } 1029 1030 static int ds_thread(void *__unused) 1031 { 1032 DEFINE_WAIT(wait); 1033 1034 while (1) { 1035 prepare_to_wait(&ds_wait, &wait, TASK_INTERRUPTIBLE); 1036 if (list_empty(&ds_work_list)) 1037 schedule(); 1038 finish_wait(&ds_wait, &wait); 1039 1040 if (kthread_should_stop()) 1041 break; 1042 1043 process_ds_work(); 1044 } 1045 1046 return 0; 1047 } 1048 1049 static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len) 1050 { 1051 struct ds_data *dpkt = (struct ds_data *) pkt; 1052 struct ds_queue_entry *qp; 1053 1054 qp = kmalloc(sizeof(struct ds_queue_entry) + len, GFP_ATOMIC); 1055 if (!qp) { 1056 __send_ds_nack(dp, dpkt->handle); 1057 } else { 1058 qp->dp = dp; 1059 memcpy(&qp->req, pkt, len); 1060 list_add_tail(&qp->list, &ds_work_list); 1061 wake_up(&ds_wait); 1062 } 1063 return 0; 1064 } 1065 1066 static void ds_up(struct ds_info *dp) 1067 { 1068 struct ldc_channel *lp = dp->lp; 1069 struct ds_ver_req req; 1070 int err; 1071 1072 req.tag.type = DS_INIT_REQ; 1073 req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag); 1074 req.ver.major = 1; 1075 req.ver.minor = 0; 1076 1077 err = __ds_send(lp, &req, sizeof(req)); 1078 if (err > 0) 1079 dp->hs_state = DS_HS_START; 1080 } 1081 1082 static void ds_reset(struct ds_info *dp) 1083 { 1084 int i; 1085 1086 dp->hs_state = 0; 1087 1088 for (i = 0; i < dp->num_ds_states; i++) { 1089 struct ds_cap_state *cp = &dp->ds_states[i]; 1090 1091 cp->state = CAP_STATE_UNKNOWN; 1092 } 1093 } 1094 1095 static void ds_event(void *arg, int event) 1096 { 1097 struct ds_info *dp = arg; 1098 struct ldc_channel *lp = dp->lp; 1099 unsigned long flags; 1100 int err; 1101 1102 spin_lock_irqsave(&ds_lock, flags); 1103 1104 if (event == LDC_EVENT_UP) { 1105 ds_up(dp); 1106 spin_unlock_irqrestore(&ds_lock, flags); 1107 return; 1108 } 1109 1110 if (event == LDC_EVENT_RESET) { 1111 ds_reset(dp); 1112 spin_unlock_irqrestore(&ds_lock, flags); 1113 return; 1114 } 1115 1116 if (event != LDC_EVENT_DATA_READY) { 1117 printk(KERN_WARNING "ds-%llu: Unexpected LDC event %d\n", 1118 dp->id, event); 1119 spin_unlock_irqrestore(&ds_lock, flags); 1120 return; 1121 } 1122 1123 err = 0; 1124 while (1) { 1125 struct ds_msg_tag *tag; 1126 1127 err = ldc_read(lp, dp->rcv_buf, sizeof(*tag)); 1128 1129 if (unlikely(err < 0)) { 1130 if (err == -ECONNRESET) 1131 ds_conn_reset(dp); 1132 break; 1133 } 1134 if (err == 0) 1135 break; 1136 1137 tag = dp->rcv_buf; 1138 err = ldc_read(lp, tag + 1, tag->len); 1139 1140 if (unlikely(err < 0)) { 1141 if (err == -ECONNRESET) 1142 ds_conn_reset(dp); 1143 break; 1144 } 1145 if (err < tag->len) 1146 break; 1147 1148 if (tag->type < DS_DATA) 1149 err = ds_handshake(dp, dp->rcv_buf); 1150 else 1151 err = ds_data(dp, dp->rcv_buf, 1152 sizeof(*tag) + err); 1153 if (err == -ECONNRESET) 1154 break; 1155 } 1156 1157 spin_unlock_irqrestore(&ds_lock, flags); 1158 } 1159 1160 static int ds_probe(struct vio_dev *vdev, const struct vio_device_id *id) 1161 { 1162 static int ds_version_printed; 1163 struct ldc_channel_config ds_cfg = { 1164 .event = ds_event, 1165 .mtu = 4096, 1166 .mode = LDC_MODE_STREAM, 1167 }; 1168 struct mdesc_handle *hp; 1169 struct ldc_channel *lp; 1170 struct ds_info *dp; 1171 const u64 *val; 1172 int err, i; 1173 1174 if (ds_version_printed++ == 0) 1175 printk(KERN_INFO "%s", version); 1176 1177 dp = kzalloc(sizeof(*dp), GFP_KERNEL); 1178 err = -ENOMEM; 1179 if (!dp) 1180 goto out_err; 1181 1182 hp = mdesc_grab(); 1183 val = mdesc_get_property(hp, vdev->mp, "id", NULL); 1184 if (val) 1185 dp->id = *val; 1186 mdesc_release(hp); 1187 1188 dp->rcv_buf = kzalloc(4096, GFP_KERNEL); 1189 if (!dp->rcv_buf) 1190 goto out_free_dp; 1191 1192 dp->rcv_buf_len = 4096; 1193 1194 dp->ds_states = kmemdup(ds_states_template, 1195 sizeof(ds_states_template), GFP_KERNEL); 1196 if (!dp->ds_states) 1197 goto out_free_rcv_buf; 1198 1199 dp->num_ds_states = ARRAY_SIZE(ds_states_template); 1200 1201 for (i = 0; i < dp->num_ds_states; i++) 1202 dp->ds_states[i].handle = ((u64)i << 32); 1203 1204 ds_cfg.tx_irq = vdev->tx_irq; 1205 ds_cfg.rx_irq = vdev->rx_irq; 1206 1207 lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp); 1208 if (IS_ERR(lp)) { 1209 err = PTR_ERR(lp); 1210 goto out_free_ds_states; 1211 } 1212 dp->lp = lp; 1213 1214 err = ldc_bind(lp, "DS"); 1215 if (err) 1216 goto out_free_ldc; 1217 1218 spin_lock_irq(&ds_lock); 1219 dp->next = ds_info_list; 1220 ds_info_list = dp; 1221 spin_unlock_irq(&ds_lock); 1222 1223 return err; 1224 1225 out_free_ldc: 1226 ldc_free(dp->lp); 1227 1228 out_free_ds_states: 1229 kfree(dp->ds_states); 1230 1231 out_free_rcv_buf: 1232 kfree(dp->rcv_buf); 1233 1234 out_free_dp: 1235 kfree(dp); 1236 1237 out_err: 1238 return err; 1239 } 1240 1241 static int ds_remove(struct vio_dev *vdev) 1242 { 1243 return 0; 1244 } 1245 1246 static const struct vio_device_id ds_match[] = { 1247 { 1248 .type = "domain-services-port", 1249 }, 1250 {}, 1251 }; 1252 1253 static struct vio_driver ds_driver = { 1254 .id_table = ds_match, 1255 .probe = ds_probe, 1256 .remove = ds_remove, 1257 .name = "ds", 1258 }; 1259 1260 static int __init ds_init(void) 1261 { 1262 unsigned long hv_ret, major, minor; 1263 1264 if (tlb_type == hypervisor) { 1265 hv_ret = sun4v_get_version(HV_GRP_REBOOT_DATA, &major, &minor); 1266 if (hv_ret == HV_EOK) { 1267 pr_info("SUN4V: Reboot data supported (maj=%lu,min=%lu).\n", 1268 major, minor); 1269 reboot_data_supported = 1; 1270 } 1271 } 1272 kthread_run(ds_thread, NULL, "kldomd"); 1273 1274 return vio_register_driver(&ds_driver); 1275 } 1276 1277 fs_initcall(ds_init); 1278