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