arch/sparc/kernel/ds.c

   1 /* ds.c: Domain Services driver for Logical Domains
   2  *
   3  * Copyright (C) 2007, 2008 David S. Miller <[email protected]>
   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 ([email protected])");
  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                 snprintf(full_boot_str, sizeof(full_boot_str), "boot %s",
 853                          boot_command);
 854                 len = strlen(full_boot_str);
 855
 856                 if (reboot_data_supported) {
 857                         unsigned long ra = kimage_addr_to_ra(full_boot_str);
 858                         unsigned long hv_ret;
 859
 860                         hv_ret = sun4v_reboot_data_set(ra, len);
 861                         if (hv_ret != HV_EOK)
 862                                 pr_err("SUN4V: Unable to set reboot data "
 863                                        "hv_ret=%lu\n", hv_ret);
 864                 } else {
 865                         ldom_set_var("reboot-command", full_boot_str);
 866                 }
 867         }
 868         sun4v_mach_sir();
 869 }
 870
 871 void ldom_power_off(void)
 872 {
 873         sun4v_mach_exit(0);
 874 }
 875
 876 static void ds_conn_reset(struct ds_info *dp)
 877 {
 878         printk(KERN_ERR "ds-%llu: ds_conn_reset() from %pf\n",
 879                dp->id, __builtin_return_address(0));
 880 }
 881
 882 static int register_services(struct ds_info *dp)
 883 {
 884         struct ldc_channel *lp = dp->lp;
 885         int i;
 886
 887         for (i = 0; i < dp->num_ds_states; i++) {
 888                 struct {
 889                         struct ds_reg_req req;
 890                         u8 id_buf[256];
 891                 } pbuf;
 892                 struct ds_cap_state *cp = &dp->ds_states[i];
 893                 int err, msg_len;
 894                 u64 new_count;
 895
 896                 if (cp->state == CAP_STATE_REGISTERED)
 897                         continue;
 898
 899                 new_count = sched_clock() & 0xffffffff;
 900                 cp->handle = ((u64) i << 32) | new_count;
 901
 902                 msg_len = (sizeof(struct ds_reg_req) +
 903                            strlen(cp->service_id));
 904
 905                 memset(&pbuf, 0, sizeof(pbuf));
 906                 pbuf.req.tag.type = DS_REG_REQ;
 907                 pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag));
 908                 pbuf.req.handle = cp->handle;
 909                 pbuf.req.major = 1;
 910                 pbuf.req.minor = 0;
 911                 strcpy(pbuf.req.svc_id, cp->service_id);
 912
 913                 err = __ds_send(lp, &pbuf, msg_len);
 914                 if (err > 0)
 915                         cp->state = CAP_STATE_REG_SENT;
 916         }
 917         return 0;
 918 }
 919
 920 static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt)
 921 {
 922
 923         if (dp->hs_state == DS_HS_START) {
 924                 if (pkt->type != DS_INIT_ACK)
 925                         goto conn_reset;
 926
 927                 dp->hs_state = DS_HS_DONE;
 928
 929                 return register_services(dp);
 930         }
 931
 932         if (dp->hs_state != DS_HS_DONE)
 933                 goto conn_reset;
 934
 935         if (pkt->type == DS_REG_ACK) {
 936                 struct ds_reg_ack *ap = (struct ds_reg_ack *) pkt;
 937                 struct ds_cap_state *cp = find_cap(dp, ap->handle);
 938
 939                 if (!cp) {
 940                         printk(KERN_ERR "ds-%llu: REG ACK for unknown "
 941                                "handle %llx\n", dp->id, ap->handle);
 942                         return 0;
 943                 }
 944                 printk(KERN_INFO "ds-%llu: Registered %s service.\n",
 945                        dp->id, cp->service_id);
 946                 cp->state = CAP_STATE_REGISTERED;
 947         } else if (pkt->type == DS_REG_NACK) {
 948                 struct ds_reg_nack *np = (struct ds_reg_nack *) pkt;
 949                 struct ds_cap_state *cp = find_cap(dp, np->handle);
 950
 951                 if (!cp) {
 952                         printk(KERN_ERR "ds-%llu: REG NACK for "
 953                                "unknown handle %llx\n",
 954                                dp->id, np->handle);
 955                         return 0;
 956                 }
 957                 cp->state = CAP_STATE_UNKNOWN;
 958         }
 959
 960         return 0;
 961
 962 conn_reset:
 963         ds_conn_reset(dp);
 964         return -ECONNRESET;
 965 }
 966
 967 static void __send_ds_nack(struct ds_info *dp, u64 handle)
 968 {
 969         struct ds_data_nack nack = {
 970                 .tag = {
 971                         .type = DS_NACK,
 972                         .len = (sizeof(struct ds_data_nack) -
 973                                 sizeof(struct ds_msg_tag)),
 974                 },
 975                 .handle = handle,
 976                 .result = DS_INV_HDL,
 977         };
 978
 979         __ds_send(dp->lp, &nack, sizeof(nack));
 980 }
 981
 982 static LIST_HEAD(ds_work_list);
 983 static DECLARE_WAIT_QUEUE_HEAD(ds_wait);
 984
 985 struct ds_queue_entry {
 986         struct list_head                list;
 987         struct ds_info                  *dp;
 988         int                             req_len;
 989         int                             __pad;
 990         u64                             req[0];
 991 };
 992
 993 static void process_ds_work(void)
 994 {
 995         struct ds_queue_entry *qp, *tmp;
 996         unsigned long flags;
 997         LIST_HEAD(todo);
 998
 999         spin_lock_irqsave(&ds_lock, flags);
1000         list_splice_init(&ds_work_list, &todo);
1001         spin_unlock_irqrestore(&ds_lock, flags);
1002
1003         list_for_each_entry_safe(qp, tmp, &todo, list) {
1004                 struct ds_data *dpkt = (struct ds_data *) qp->req;
1005                 struct ds_info *dp = qp->dp;
1006                 struct ds_cap_state *cp = find_cap(dp, dpkt->handle);
1007                 int req_len = qp->req_len;
1008
1009                 if (!cp) {
1010                         printk(KERN_ERR "ds-%llu: Data for unknown "
1011                                "handle %llu\n",
1012                                dp->id, dpkt->handle);
1013
1014                         spin_lock_irqsave(&ds_lock, flags);
1015                         __send_ds_nack(dp, dpkt->handle);
1016                         spin_unlock_irqrestore(&ds_lock, flags);
1017                 } else {
1018                         cp->data(dp, cp, dpkt, req_len);
1019                 }
1020
1021                 list_del(&qp->list);
1022                 kfree(qp);
1023         }
1024 }
1025
1026 static int ds_thread(void *__unused)
1027 {
1028         DEFINE_WAIT(wait);
1029
1030         while (1) {
1031                 prepare_to_wait(&ds_wait, &wait, TASK_INTERRUPTIBLE);
1032                 if (list_empty(&ds_work_list))
1033                         schedule();
1034                 finish_wait(&ds_wait, &wait);
1035
1036                 if (kthread_should_stop())
1037                         break;
1038
1039                 process_ds_work();
1040         }
1041
1042         return 0;
1043 }
1044
1045 static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len)
1046 {
1047         struct ds_data *dpkt = (struct ds_data *) pkt;
1048         struct ds_queue_entry *qp;
1049
1050         qp = kmalloc(sizeof(struct ds_queue_entry) + len, GFP_ATOMIC);
1051         if (!qp) {
1052                 __send_ds_nack(dp, dpkt->handle);
1053         } else {
1054                 qp->dp = dp;
1055                 memcpy(&qp->req, pkt, len);
1056                 list_add_tail(&qp->list, &ds_work_list);
1057                 wake_up(&ds_wait);
1058         }
1059         return 0;
1060 }
1061
1062 static void ds_up(struct ds_info *dp)
1063 {
1064         struct ldc_channel *lp = dp->lp;
1065         struct ds_ver_req req;
1066         int err;
1067
1068         req.tag.type = DS_INIT_REQ;
1069         req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag);
1070         req.ver.major = 1;
1071         req.ver.minor = 0;
1072
1073         err = __ds_send(lp, &req, sizeof(req));
1074         if (err > 0)
1075                 dp->hs_state = DS_HS_START;
1076 }
1077
1078 static void ds_reset(struct ds_info *dp)
1079 {
1080         int i;
1081
1082         dp->hs_state = 0;
1083
1084         for (i = 0; i < dp->num_ds_states; i++) {
1085                 struct ds_cap_state *cp = &dp->ds_states[i];
1086
1087                 cp->state = CAP_STATE_UNKNOWN;
1088         }
1089 }
1090
1091 static void ds_event(void *arg, int event)
1092 {
1093         struct ds_info *dp = arg;
1094         struct ldc_channel *lp = dp->lp;
1095         unsigned long flags;
1096         int err;
1097
1098         spin_lock_irqsave(&ds_lock, flags);
1099
1100         if (event == LDC_EVENT_UP) {
1101                 ds_up(dp);
1102                 spin_unlock_irqrestore(&ds_lock, flags);
1103                 return;
1104         }
1105
1106         if (event == LDC_EVENT_RESET) {
1107                 ds_reset(dp);
1108                 spin_unlock_irqrestore(&ds_lock, flags);
1109                 return;
1110         }
1111
1112         if (event != LDC_EVENT_DATA_READY) {
1113                 printk(KERN_WARNING "ds-%llu: Unexpected LDC event %d\n",
1114                        dp->id, event);
1115                 spin_unlock_irqrestore(&ds_lock, flags);
1116                 return;
1117         }
1118
1119         err = 0;
1120         while (1) {
1121                 struct ds_msg_tag *tag;
1122
1123                 err = ldc_read(lp, dp->rcv_buf, sizeof(*tag));
1124
1125                 if (unlikely(err < 0)) {
1126                         if (err == -ECONNRESET)
1127                                 ds_conn_reset(dp);
1128                         break;
1129                 }
1130                 if (err == 0)
1131                         break;
1132
1133                 tag = dp->rcv_buf;
1134                 err = ldc_read(lp, tag + 1, tag->len);
1135
1136                 if (unlikely(err < 0)) {
1137                         if (err == -ECONNRESET)
1138                                 ds_conn_reset(dp);
1139                         break;
1140                 }
1141                 if (err < tag->len)
1142                         break;
1143
1144                 if (tag->type < DS_DATA)
1145                         err = ds_handshake(dp, dp->rcv_buf);
1146                 else
1147                         err = ds_data(dp, dp->rcv_buf,
1148                                       sizeof(*tag) + err);
1149                 if (err == -ECONNRESET)
1150                         break;
1151         }
1152
1153         spin_unlock_irqrestore(&ds_lock, flags);
1154 }
1155
1156 static int ds_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1157 {
1158         static int ds_version_printed;
1159         struct ldc_channel_config ds_cfg = {
1160                 .event          = ds_event,
1161                 .mtu            = 4096,
1162                 .mode           = LDC_MODE_STREAM,
1163         };
1164         struct mdesc_handle *hp;
1165         struct ldc_channel *lp;
1166         struct ds_info *dp;
1167         const u64 *val;
1168         int err, i;
1169
1170         if (ds_version_printed++ == 0)
1171                 printk(KERN_INFO "%s", version);
1172
1173         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1174         err = -ENOMEM;
1175         if (!dp)
1176                 goto out_err;
1177
1178         hp = mdesc_grab();
1179         val = mdesc_get_property(hp, vdev->mp, "id", NULL);
1180         if (val)
1181                 dp->id = *val;
1182         mdesc_release(hp);
1183
1184         dp->rcv_buf = kzalloc(4096, GFP_KERNEL);
1185         if (!dp->rcv_buf)
1186                 goto out_free_dp;
1187
1188         dp->rcv_buf_len = 4096;
1189
1190         dp->ds_states = kmemdup(ds_states_template,
1191                                 sizeof(ds_states_template), GFP_KERNEL);
1192         if (!dp->ds_states)
1193                 goto out_free_rcv_buf;
1194
1195         dp->num_ds_states = ARRAY_SIZE(ds_states_template);
1196
1197         for (i = 0; i < dp->num_ds_states; i++)
1198                 dp->ds_states[i].handle = ((u64)i << 32);
1199
1200         ds_cfg.tx_irq = vdev->tx_irq;
1201         ds_cfg.rx_irq = vdev->rx_irq;
1202
1203         lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp);
1204         if (IS_ERR(lp)) {
1205                 err = PTR_ERR(lp);
1206                 goto out_free_ds_states;
1207         }
1208         dp->lp = lp;
1209
1210         err = ldc_bind(lp, "DS");
1211         if (err)
1212                 goto out_free_ldc;
1213
1214         spin_lock_irq(&ds_lock);
1215         dp->next = ds_info_list;
1216         ds_info_list = dp;
1217         spin_unlock_irq(&ds_lock);
1218
1219         return err;
1220
1221 out_free_ldc:
1222         ldc_free(dp->lp);
1223
1224 out_free_ds_states:
1225         kfree(dp->ds_states);
1226
1227 out_free_rcv_buf:
1228         kfree(dp->rcv_buf);
1229
1230 out_free_dp:
1231         kfree(dp);
1232
1233 out_err:
1234         return err;
1235 }
1236
1237 static int ds_remove(struct vio_dev *vdev)
1238 {
1239         return 0;
1240 }
1241
1242 static const struct vio_device_id ds_match[] = {
1243         {
1244                 .type = "domain-services-port",
1245         },
1246         {},
1247 };
1248
1249 static struct vio_driver ds_driver = {
1250         .id_table       = ds_match,
1251         .probe          = ds_probe,
1252         .remove         = ds_remove,
1253         .name           = "ds",
1254 };
1255
1256 static int __init ds_init(void)
1257 {
1258         unsigned long hv_ret, major, minor;
1259
1260         if (tlb_type == hypervisor) {
1261                 hv_ret = sun4v_get_version(HV_GRP_REBOOT_DATA, &major, &minor);
1262                 if (hv_ret == HV_EOK) {
1263                         pr_info("SUN4V: Reboot data supported (maj=%lu,min=%lu).\n",
1264                                 major, minor);
1265                         reboot_data_supported = 1;
1266                 }
1267         }
1268         kthread_run(ds_thread, NULL, "kldomd");
1269
1270         return vio_register_driver(&ds_driver);
1271 }
1272
1273 fs_initcall(ds_init);