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 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 } 587 588 static 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 } 627 628 static 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 */ 670 671 struct 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 }; 678 679 static 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 } 691 692 struct 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 }; 699 700 struct ds_var_set_msg { 701 struct ds_var_hdr hdr; 702 char name_and_value[0]; 703 }; 704 705 struct ds_var_delete_msg { 706 struct ds_var_hdr hdr; 707 char name[0]; 708 }; 709 710 struct 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 }; 719 720 static DEFINE_MUTEX(ds_var_mutex); 721 static int ds_var_doorbell; 722 static int ds_var_response; 723 724 static 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 } 741 742 void 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 } 840 841 static char full_boot_str[256] __attribute__((aligned(32))); 842 static int reboot_data_supported; 843 844 void 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 strcpy(full_boot_str, "boot "); 853 strlcpy(full_boot_str + strlen("boot "), boot_command, 854 sizeof(full_boot_str + strlen("boot "))); 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.req.svc_id, 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); 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, "DS"); 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