arch/sparc/kernel/ds.c

   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/ldc.h>
  19 #include <asm/vio.h>
  20 #include <asm/mdesc.h>
  21 #include <asm/head.h>
  22 #include <asm/irq.h>
  23
  24 #define DRV_MODULE_NAME         "ds"
  25 #define PFX DRV_MODULE_NAME     ": "
  26 #define DRV_MODULE_VERSION      "1.0"
  27 #define DRV_MODULE_RELDATE      "Jul 11, 2007"
  28
  29 static char version[] __devinitdata =
  30         DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  31 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
  32 MODULE_DESCRIPTION("Sun LDOM domain services driver");
  33 MODULE_LICENSE("GPL");
  34 MODULE_VERSION(DRV_MODULE_VERSION);
  35
  36 struct ds_msg_tag {
  37         __u32                   type;
  38 #define DS_INIT_REQ             0x00
  39 #define DS_INIT_ACK             0x01
  40 #define DS_INIT_NACK            0x02
  41 #define DS_REG_REQ              0x03
  42 #define DS_REG_ACK              0x04
  43 #define DS_REG_NACK             0x05
  44 #define DS_UNREG_REQ            0x06
  45 #define DS_UNREG_ACK            0x07
  46 #define DS_UNREG_NACK           0x08
  47 #define DS_DATA                 0x09
  48 #define DS_NACK                 0x0a
  49
  50         __u32                   len;
  51 };
  52
  53 /* Result codes */
  54 #define DS_OK                   0x00
  55 #define DS_REG_VER_NACK         0x01
  56 #define DS_REG_DUP              0x02
  57 #define DS_INV_HDL              0x03
  58 #define DS_TYPE_UNKNOWN         0x04
  59
  60 struct ds_version {
  61         __u16                   major;
  62         __u16                   minor;
  63 };
  64
  65 struct ds_ver_req {
  66         struct ds_msg_tag       tag;
  67         struct ds_version       ver;
  68 };
  69
  70 struct ds_ver_ack {
  71         struct ds_msg_tag       tag;
  72         __u16                   minor;
  73 };
  74
  75 struct ds_ver_nack {
  76         struct ds_msg_tag       tag;
  77         __u16                   major;
  78 };
  79
  80 struct ds_reg_req {
  81         struct ds_msg_tag       tag;
  82         __u64                   handle;
  83         __u16                   major;
  84         __u16                   minor;
  85         char                    svc_id[0];
  86 };
  87
  88 struct ds_reg_ack {
  89         struct ds_msg_tag       tag;
  90         __u64                   handle;
  91         __u16                   minor;
  92 };
  93
  94 struct ds_reg_nack {
  95         struct ds_msg_tag       tag;
  96         __u64                   handle;
  97         __u16                   major;
  98 };
  99
 100 struct ds_unreg_req {
 101         struct ds_msg_tag       tag;
 102         __u64                   handle;
 103 };
 104
 105 struct ds_unreg_ack {
 106         struct ds_msg_tag       tag;
 107         __u64                   handle;
 108 };
 109
 110 struct ds_unreg_nack {
 111         struct ds_msg_tag       tag;
 112         __u64                   handle;
 113 };
 114
 115 struct ds_data {
 116         struct ds_msg_tag       tag;
 117         __u64                   handle;
 118 };
 119
 120 struct ds_data_nack {
 121         struct ds_msg_tag       tag;
 122         __u64                   handle;
 123         __u64                   result;
 124 };
 125
 126 struct ds_info;
 127 struct ds_cap_state {
 128         __u64                   handle;
 129
 130         void                    (*data)(struct ds_info *dp,
 131                                         struct ds_cap_state *cp,
 132                                         void *buf, int len);
 133
 134         const char              *service_id;
 135
 136         u8                      state;
 137 #define CAP_STATE_UNKNOWN       0x00
 138 #define CAP_STATE_REG_SENT      0x01
 139 #define CAP_STATE_REGISTERED    0x02
 140 };
 141
 142 static void md_update_data(struct ds_info *dp, struct ds_cap_state *cp,
 143                            void *buf, int len);
 144 static void domain_shutdown_data(struct ds_info *dp,
 145                                  struct ds_cap_state *cp,
 146                                  void *buf, int len);
 147 static void domain_panic_data(struct ds_info *dp,
 148                               struct ds_cap_state *cp,
 149                               void *buf, int len);
 150 #ifdef CONFIG_HOTPLUG_CPU
 151 static void dr_cpu_data(struct ds_info *dp,
 152                         struct ds_cap_state *cp,
 153                         void *buf, int len);
 154 #endif
 155 static void ds_pri_data(struct ds_info *dp,
 156                         struct ds_cap_state *cp,
 157                         void *buf, int len);
 158 static void ds_var_data(struct ds_info *dp,
 159                         struct ds_cap_state *cp,
 160                         void *buf, int len);
 161
 162 static struct ds_cap_state ds_states_template[] = {
 163         {
 164                 .service_id     = "md-update",
 165                 .data           = md_update_data,
 166         },
 167         {
 168                 .service_id     = "domain-shutdown",
 169                 .data           = domain_shutdown_data,
 170         },
 171         {
 172                 .service_id     = "domain-panic",
 173                 .data           = domain_panic_data,
 174         },
 175 #ifdef CONFIG_HOTPLUG_CPU
 176         {
 177                 .service_id     = "dr-cpu",
 178                 .data           = dr_cpu_data,
 179         },
 180 #endif
 181         {
 182                 .service_id     = "pri",
 183                 .data           = ds_pri_data,
 184         },
 185         {
 186                 .service_id     = "var-config",
 187                 .data           = ds_var_data,
 188         },
 189         {
 190                 .service_id     = "var-config-backup",
 191                 .data           = ds_var_data,
 192         },
 193 };
 194
 195 static DEFINE_SPINLOCK(ds_lock);
 196
 197 struct ds_info {
 198         struct ldc_channel      *lp;
 199         u8                      hs_state;
 200 #define DS_HS_START             0x01
 201 #define DS_HS_DONE              0x02
 202
 203         u64                     id;
 204
 205         void                    *rcv_buf;
 206         int                     rcv_buf_len;
 207
 208         struct ds_cap_state     *ds_states;
 209         int                     num_ds_states;
 210
 211         struct ds_info          *next;
 212 };
 213
 214 static struct ds_info *ds_info_list;
 215
 216 static struct ds_cap_state *find_cap(struct ds_info *dp, u64 handle)
 217 {
 218         unsigned int index = handle >> 32;
 219
 220         if (index >= dp->num_ds_states)
 221                 return NULL;
 222         return &dp->ds_states[index];
 223 }
 224
 225 static struct ds_cap_state *find_cap_by_string(struct ds_info *dp,
 226                                                const char *name)
 227 {
 228         int i;
 229
 230         for (i = 0; i < dp->num_ds_states; i++) {
 231                 if (strcmp(dp->ds_states[i].service_id, name))
 232                         continue;
 233
 234                 return &dp->ds_states[i];
 235         }
 236         return NULL;
 237 }
 238
 239 static int __ds_send(struct ldc_channel *lp, void *data, int len)
 240 {
 241         int err, limit = 1000;
 242
 243         err = -EINVAL;
 244         while (limit-- > 0) {
 245                 err = ldc_write(lp, data, len);
 246                 if (!err || (err != -EAGAIN))
 247                         break;
 248                 udelay(1);
 249         }
 250
 251         return err;
 252 }
 253
 254 static int ds_send(struct ldc_channel *lp, void *data, int len)
 255 {
 256         unsigned long flags;
 257         int err;
 258
 259         spin_lock_irqsave(&ds_lock, flags);
 260         err = __ds_send(lp, data, len);
 261         spin_unlock_irqrestore(&ds_lock, flags);
 262
 263         return err;
 264 }
 265
 266 struct ds_md_update_req {
 267         __u64                           req_num;
 268 };
 269
 270 struct ds_md_update_res {
 271         __u64                           req_num;
 272         __u32                           result;
 273 };
 274
 275 static void md_update_data(struct ds_info *dp,
 276                            struct ds_cap_state *cp,
 277                            void *buf, int len)
 278 {
 279         struct ldc_channel *lp = dp->lp;
 280         struct ds_data *dpkt = buf;
 281         struct ds_md_update_req *rp;
 282         struct {
 283                 struct ds_data          data;
 284                 struct ds_md_update_res res;
 285         } pkt;
 286
 287         rp = (struct ds_md_update_req *) (dpkt + 1);
 288
 289         printk(KERN_INFO "ds-%llu: Machine description update.\n", dp->id);
 290
 291         mdesc_update();
 292
 293         memset(&pkt, 0, sizeof(pkt));
 294         pkt.data.tag.type = DS_DATA;
 295         pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
 296         pkt.data.handle = cp->handle;
 297         pkt.res.req_num = rp->req_num;
 298         pkt.res.result = DS_OK;
 299
 300         ds_send(lp, &pkt, sizeof(pkt));
 301 }
 302
 303 struct ds_shutdown_req {
 304         __u64                           req_num;
 305         __u32                           ms_delay;
 306 };
 307
 308 struct ds_shutdown_res {
 309         __u64                           req_num;
 310         __u32                           result;
 311         char                            reason[1];
 312 };
 313
 314 static void domain_shutdown_data(struct ds_info *dp,
 315                                  struct ds_cap_state *cp,
 316                                  void *buf, int len)
 317 {
 318         struct ldc_channel *lp = dp->lp;
 319         struct ds_data *dpkt = buf;
 320         struct ds_shutdown_req *rp;
 321         struct {
 322                 struct ds_data          data;
 323                 struct ds_shutdown_res  res;
 324         } pkt;
 325
 326         rp = (struct ds_shutdown_req *) (dpkt + 1);
 327
 328         printk(KERN_ALERT "ds-%llu: Shutdown request from "
 329                "LDOM manager received.\n", dp->id);
 330
 331         memset(&pkt, 0, sizeof(pkt));
 332         pkt.data.tag.type = DS_DATA;
 333         pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
 334         pkt.data.handle = cp->handle;
 335         pkt.res.req_num = rp->req_num;
 336         pkt.res.result = DS_OK;
 337         pkt.res.reason[0] = 0;
 338
 339         ds_send(lp, &pkt, sizeof(pkt));
 340
 341         orderly_poweroff(true);
 342 }
 343
 344 struct ds_panic_req {
 345         __u64                           req_num;
 346 };
 347
 348 struct ds_panic_res {
 349         __u64                           req_num;
 350         __u32                           result;
 351         char                            reason[1];
 352 };
 353
 354 static void domain_panic_data(struct ds_info *dp,
 355                               struct ds_cap_state *cp,
 356                               void *buf, int len)
 357 {
 358         struct ldc_channel *lp = dp->lp;
 359         struct ds_data *dpkt = buf;
 360         struct ds_panic_req *rp;
 361         struct {
 362                 struct ds_data          data;
 363                 struct ds_panic_res     res;
 364         } pkt;
 365
 366         rp = (struct ds_panic_req *) (dpkt + 1);
 367
 368         printk(KERN_ALERT "ds-%llu: Panic request from "
 369                "LDOM manager received.\n", dp->id);
 370
 371         memset(&pkt, 0, sizeof(pkt));
 372         pkt.data.tag.type = DS_DATA;
 373         pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
 374         pkt.data.handle = cp->handle;
 375         pkt.res.req_num = rp->req_num;
 376         pkt.res.result = DS_OK;
 377         pkt.res.reason[0] = 0;
 378
 379         ds_send(lp, &pkt, sizeof(pkt));
 380
 381         panic("PANIC requested by LDOM manager.");
 382 }
 383
 384 #ifdef CONFIG_HOTPLUG_CPU
 385 struct dr_cpu_tag {
 386         __u64                           req_num;
 387         __u32                           type;
 388 #define DR_CPU_CONFIGURE                0x43
 389 #define DR_CPU_UNCONFIGURE              0x55
 390 #define DR_CPU_FORCE_UNCONFIGURE        0x46
 391 #define DR_CPU_STATUS                   0x53
 392
 393 /* Responses */
 394 #define DR_CPU_OK                       0x6f
 395 #define DR_CPU_ERROR                    0x65
 396
 397         __u32                           num_records;
 398 };
 399
 400 struct dr_cpu_resp_entry {
 401         __u32                           cpu;
 402         __u32                           result;
 403 #define DR_CPU_RES_OK                   0x00
 404 #define DR_CPU_RES_FAILURE              0x01
 405 #define DR_CPU_RES_BLOCKED              0x02
 406 #define DR_CPU_RES_CPU_NOT_RESPONDING   0x03
 407 #define DR_CPU_RES_NOT_IN_MD            0x04
 408
 409         __u32                           stat;
 410 #define DR_CPU_STAT_NOT_PRESENT         0x00
 411 #define DR_CPU_STAT_UNCONFIGURED        0x01
 412 #define DR_CPU_STAT_CONFIGURED          0x02
 413
 414         __u32                           str_off;
 415 };
 416
 417 static void __dr_cpu_send_error(struct ds_info *dp,
 418                                 struct ds_cap_state *cp,
 419                                 struct ds_data *data)
 420 {
 421         struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
 422         struct {
 423                 struct ds_data          data;
 424                 struct dr_cpu_tag       tag;
 425         } pkt;
 426         int msg_len;
 427
 428         memset(&pkt, 0, sizeof(pkt));
 429         pkt.data.tag.type = DS_DATA;
 430         pkt.data.handle = cp->handle;
 431         pkt.tag.req_num = tag->req_num;
 432         pkt.tag.type = DR_CPU_ERROR;
 433         pkt.tag.num_records = 0;
 434
 435         msg_len = (sizeof(struct ds_data) +
 436                    sizeof(struct dr_cpu_tag));
 437
 438         pkt.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
 439
 440         __ds_send(dp->lp, &pkt, msg_len);
 441 }
 442
 443 static void dr_cpu_send_error(struct ds_info *dp,
 444                               struct ds_cap_state *cp,
 445                               struct ds_data *data)
 446 {
 447         unsigned long flags;
 448
 449         spin_lock_irqsave(&ds_lock, flags);
 450         __dr_cpu_send_error(dp, cp, data);
 451         spin_unlock_irqrestore(&ds_lock, flags);
 452 }
 453
 454 #define CPU_SENTINEL    0xffffffff
 455
 456 static void purge_dups(u32 *list, u32 num_ents)
 457 {
 458         unsigned int i;
 459
 460         for (i = 0; i < num_ents; i++) {
 461                 u32 cpu = list[i];
 462                 unsigned int j;
 463
 464                 if (cpu == CPU_SENTINEL)
 465                         continue;
 466
 467                 for (j = i + 1; j < num_ents; j++) {
 468                         if (list[j] == cpu)
 469                                 list[j] = CPU_SENTINEL;
 470                 }
 471         }
 472 }
 473
 474 static int dr_cpu_size_response(int ncpus)
 475 {
 476         return (sizeof(struct ds_data) +
 477                 sizeof(struct dr_cpu_tag) +
 478                 (sizeof(struct dr_cpu_resp_entry) * ncpus));
 479 }
 480
 481 static void dr_cpu_init_response(struct ds_data *resp, u64 req_num,
 482                                  u64 handle, int resp_len, int ncpus,
 483                                  cpumask_t *mask, u32 default_stat)
 484 {
 485         struct dr_cpu_resp_entry *ent;
 486         struct dr_cpu_tag *tag;
 487         int i, cpu;
 488
 489         tag = (struct dr_cpu_tag *) (resp + 1);
 490         ent = (struct dr_cpu_resp_entry *) (tag + 1);
 491
 492         resp->tag.type = DS_DATA;
 493         resp->tag.len = resp_len - sizeof(struct ds_msg_tag);
 494         resp->handle = handle;
 495         tag->req_num = req_num;
 496         tag->type = DR_CPU_OK;
 497         tag->num_records = ncpus;
 498
 499         i = 0;
 500         for_each_cpu(cpu, mask) {
 501                 ent[i].cpu = cpu;
 502                 ent[i].result = DR_CPU_RES_OK;
 503                 ent[i].stat = default_stat;
 504                 i++;
 505         }
 506         BUG_ON(i != ncpus);
 507 }
 508
 509 static void dr_cpu_mark(struct ds_data *resp, int cpu, int ncpus,
 510                         u32 res, u32 stat)
 511 {
 512         struct dr_cpu_resp_entry *ent;
 513         struct dr_cpu_tag *tag;
 514         int i;
 515
 516         tag = (struct dr_cpu_tag *) (resp + 1);
 517         ent = (struct dr_cpu_resp_entry *) (tag + 1);
 518
 519         for (i = 0; i < ncpus; i++) {
 520                 if (ent[i].cpu != cpu)
 521                         continue;
 522                 ent[i].result = res;
 523                 ent[i].stat = stat;
 524                 break;
 525         }
 526 }
 527
 528 static int __cpuinit dr_cpu_configure(struct ds_info *dp,
 529                                       struct ds_cap_state *cp,
 530                                       u64 req_num,
 531                                       cpumask_t *mask)
 532 {
 533         struct ds_data *resp;
 534         int resp_len, ncpus, cpu;
 535         unsigned long flags;
 536
 537         ncpus = cpumask_weight(mask);
 538         resp_len = dr_cpu_size_response(ncpus);
 539         resp = kzalloc(resp_len, GFP_KERNEL);
 540         if (!resp)
 541                 return -ENOMEM;
 542
 543         dr_cpu_init_response(resp, req_num, cp->handle,
 544                              resp_len, ncpus, mask,
 545                              DR_CPU_STAT_CONFIGURED);
 546
 547         mdesc_populate_present_mask(mask);
 548         mdesc_fill_in_cpu_data(mask);
 549
 550         for_each_cpu(cpu, mask) {
 551                 int err;
 552
 553                 printk(KERN_INFO "ds-%llu: Starting cpu %d...\n",
 554                        dp->id, cpu);
 555                 err = cpu_up(cpu);
 556                 if (err) {
 557                         __u32 res = DR_CPU_RES_FAILURE;
 558                         __u32 stat = DR_CPU_STAT_UNCONFIGURED;
 559
 560                         if (!cpu_present(cpu)) {
 561                                 /* CPU not present in MD */
 562                                 res = DR_CPU_RES_NOT_IN_MD;
 563                                 stat = DR_CPU_STAT_NOT_PRESENT;
 564                         } else if (err == -ENODEV) {
 565                                 /* CPU did not call in successfully */
 566                                 res = DR_CPU_RES_CPU_NOT_RESPONDING;
 567                         }
 568
 569                         printk(KERN_INFO "ds-%llu: CPU startup failed err=%d\n",
 570                                dp->id, err);
 571                         dr_cpu_mark(resp, cpu, ncpus, res, stat);
 572                 }
 573         }
 574
 575         spin_lock_irqsave(&ds_lock, flags);
 576         __ds_send(dp->lp, resp, resp_len);
 577         spin_unlock_irqrestore(&ds_lock, flags);
 578
 579         kfree(resp);
 580
 581         /* Redistribute IRQs, taking into account the new cpus.  */
 582         fixup_irqs();
 583
 584         return 0;
 585 }
 586
 587 static int dr_cpu_unconfigure(struct ds_info *dp,
 588                               struct ds_cap_state *cp,
 589                               u64 req_num,
 590                               cpumask_t *mask)
 591 {
 592         struct ds_data *resp;
 593         int resp_len, ncpus, cpu;
 594         unsigned long flags;
 595
 596         ncpus = cpumask_weight(mask);
 597         resp_len = dr_cpu_size_response(ncpus);
 598         resp = kzalloc(resp_len, GFP_KERNEL);
 599         if (!resp)
 600                 return -ENOMEM;
 601
 602         dr_cpu_init_response(resp, req_num, cp->handle,
 603                              resp_len, ncpus, mask,
 604                              DR_CPU_STAT_UNCONFIGURED);
 605
 606         for_each_cpu(cpu, mask) {
 607                 int err;
 608
 609                 printk(KERN_INFO "ds-%llu: Shutting down cpu %d...\n",
 610                        dp->id, cpu);
 611                 err = cpu_down(cpu);
 612                 if (err)
 613                         dr_cpu_mark(resp, cpu, ncpus,
 614                                     DR_CPU_RES_FAILURE,
 615                                     DR_CPU_STAT_CONFIGURED);
 616         }
 617
 618         spin_lock_irqsave(&ds_lock, flags);
 619         __ds_send(dp->lp, resp, resp_len);
 620         spin_unlock_irqrestore(&ds_lock, flags);
 621
 622         kfree(resp);
 623
 624         return 0;
 625 }
 626
 627 static void __cpuinit dr_cpu_data(struct ds_info *dp,
 628                                   struct ds_cap_state *cp,
 629                                   void *buf, 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                 memset(&pkt, 0, sizeof(pkt));
 784                 pkt.header.data.tag.type = DS_DATA;
 785                 pkt.header.data.handle = cp->handle;
 786                 pkt.header.msg.hdr.type = DS_VAR_SET_REQ;
 787                 base = p = &pkt.header.msg.name_and_value[0];
 788                 strcpy(p, var);
 789                 p += strlen(var) + 1;
 790                 strcpy(p, value);
 791                 p += strlen(value) + 1;
 792
 793                 msg_len = (sizeof(struct ds_data) +
 794                            sizeof(struct ds_var_set_msg) +
 795                            (p - base));
 796                 msg_len = (msg_len + 3) & ~3;
 797                 pkt.header.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
 798
 799                 mutex_lock(&ds_var_mutex);
 800
 801                 spin_lock_irqsave(&ds_lock, flags);
 802                 ds_var_doorbell = 0;
 803                 ds_var_response = -1;
 804
 805                 __ds_send(dp->lp, &pkt, msg_len);
 806                 spin_unlock_irqrestore(&ds_lock, flags);
 807
 808                 loops = 1000;
 809                 while (ds_var_doorbell == 0) {
 810                         if (loops-- < 0)
 811                                 break;
 812                         barrier();
 813                         udelay(100);
 814                 }
 815
 816                 mutex_unlock(&ds_var_mutex);
 817
 818                 if (ds_var_doorbell == 0 ||
 819                     ds_var_response != DS_VAR_SUCCESS)
 820                         printk(KERN_ERR "ds-%llu: var-config [%s:%s] "
 821                                "failed, response(%d).\n",
 822                                dp->id, var, value,
 823                                ds_var_response);
 824         } else {
 825                 printk(KERN_ERR PFX "var-config not registered so "
 826                        "could not set (%s) variable to (%s).\n",
 827                        var, value);
 828         }
 829 }
 830
 831 void ldom_reboot(const char *boot_command)
 832 {
 833         /* Don't bother with any of this if the boot_command
 834          * is empty.
 835          */
 836         if (boot_command && strlen(boot_command)) {
 837                 char full_boot_str[256];
 838
 839                 strcpy(full_boot_str, "boot ");
 840                 strcpy(full_boot_str + strlen("boot "), boot_command);
 841
 842                 ldom_set_var("reboot-command", full_boot_str);
 843         }
 844         sun4v_mach_sir();
 845 }
 846
 847 void ldom_power_off(void)
 848 {
 849         sun4v_mach_exit(0);
 850 }
 851
 852 static void ds_conn_reset(struct ds_info *dp)
 853 {
 854         printk(KERN_ERR "ds-%llu: ds_conn_reset() from %p\n",
 855                dp->id, __builtin_return_address(0));
 856 }
 857
 858 static int register_services(struct ds_info *dp)
 859 {
 860         struct ldc_channel *lp = dp->lp;
 861         int i;
 862
 863         for (i = 0; i < dp->num_ds_states; i++) {
 864                 struct {
 865                         struct ds_reg_req req;
 866                         u8 id_buf[256];
 867                 } pbuf;
 868                 struct ds_cap_state *cp = &dp->ds_states[i];
 869                 int err, msg_len;
 870                 u64 new_count;
 871
 872                 if (cp->state == CAP_STATE_REGISTERED)
 873                         continue;
 874
 875                 new_count = sched_clock() & 0xffffffff;
 876                 cp->handle = ((u64) i << 32) | new_count;
 877
 878                 msg_len = (sizeof(struct ds_reg_req) +
 879                            strlen(cp->service_id));
 880
 881                 memset(&pbuf, 0, sizeof(pbuf));
 882                 pbuf.req.tag.type = DS_REG_REQ;
 883                 pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag));
 884                 pbuf.req.handle = cp->handle;
 885                 pbuf.req.major = 1;
 886                 pbuf.req.minor = 0;
 887                 strcpy(pbuf.req.svc_id, cp->service_id);
 888
 889                 err = __ds_send(lp, &pbuf, msg_len);
 890                 if (err > 0)
 891                         cp->state = CAP_STATE_REG_SENT;
 892         }
 893         return 0;
 894 }
 895
 896 static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt)
 897 {
 898
 899         if (dp->hs_state == DS_HS_START) {
 900                 if (pkt->type != DS_INIT_ACK)
 901                         goto conn_reset;
 902
 903                 dp->hs_state = DS_HS_DONE;
 904
 905                 return register_services(dp);
 906         }
 907
 908         if (dp->hs_state != DS_HS_DONE)
 909                 goto conn_reset;
 910
 911         if (pkt->type == DS_REG_ACK) {
 912                 struct ds_reg_ack *ap = (struct ds_reg_ack *) pkt;
 913                 struct ds_cap_state *cp = find_cap(dp, ap->handle);
 914
 915                 if (!cp) {
 916                         printk(KERN_ERR "ds-%llu: REG ACK for unknown "
 917                                "handle %llx\n", dp->id, ap->handle);
 918                         return 0;
 919                 }
 920                 printk(KERN_INFO "ds-%llu: Registered %s service.\n",
 921                        dp->id, cp->service_id);
 922                 cp->state = CAP_STATE_REGISTERED;
 923         } else if (pkt->type == DS_REG_NACK) {
 924                 struct ds_reg_nack *np = (struct ds_reg_nack *) pkt;
 925                 struct ds_cap_state *cp = find_cap(dp, np->handle);
 926
 927                 if (!cp) {
 928                         printk(KERN_ERR "ds-%llu: REG NACK for "
 929                                "unknown handle %llx\n",
 930                                dp->id, np->handle);
 931                         return 0;
 932                 }
 933                 cp->state = CAP_STATE_UNKNOWN;
 934         }
 935
 936         return 0;
 937
 938 conn_reset:
 939         ds_conn_reset(dp);
 940         return -ECONNRESET;
 941 }
 942
 943 static void __send_ds_nack(struct ds_info *dp, u64 handle)
 944 {
 945         struct ds_data_nack nack = {
 946                 .tag = {
 947                         .type = DS_NACK,
 948                         .len = (sizeof(struct ds_data_nack) -
 949                                 sizeof(struct ds_msg_tag)),
 950                 },
 951                 .handle = handle,
 952                 .result = DS_INV_HDL,
 953         };
 954
 955         __ds_send(dp->lp, &nack, sizeof(nack));
 956 }
 957
 958 static LIST_HEAD(ds_work_list);
 959 static DECLARE_WAIT_QUEUE_HEAD(ds_wait);
 960
 961 struct ds_queue_entry {
 962         struct list_head                list;
 963         struct ds_info                  *dp;
 964         int                             req_len;
 965         int                             __pad;
 966         u64                             req[0];
 967 };
 968
 969 static void process_ds_work(void)
 970 {
 971         struct ds_queue_entry *qp, *tmp;
 972         unsigned long flags;
 973         LIST_HEAD(todo);
 974
 975         spin_lock_irqsave(&ds_lock, flags);
 976         list_splice_init(&ds_work_list, &todo);
 977         spin_unlock_irqrestore(&ds_lock, flags);
 978
 979         list_for_each_entry_safe(qp, tmp, &todo, list) {
 980                 struct ds_data *dpkt = (struct ds_data *) qp->req;
 981                 struct ds_info *dp = qp->dp;
 982                 struct ds_cap_state *cp = find_cap(dp, dpkt->handle);
 983                 int req_len = qp->req_len;
 984
 985                 if (!cp) {
 986                         printk(KERN_ERR "ds-%llu: Data for unknown "
 987                                "handle %llu\n",
 988                                dp->id, dpkt->handle);
 989
 990                         spin_lock_irqsave(&ds_lock, flags);
 991                         __send_ds_nack(dp, dpkt->handle);
 992                         spin_unlock_irqrestore(&ds_lock, flags);
 993                 } else {
 994                         cp->data(dp, cp, dpkt, req_len);
 995                 }
 996
 997                 list_del(&qp->list);
 998                 kfree(qp);
 999         }
1000 }
1001
1002 static int ds_thread(void *__unused)
1003 {
1004         DEFINE_WAIT(wait);
1005
1006         while (1) {
1007                 prepare_to_wait(&ds_wait, &wait, TASK_INTERRUPTIBLE);
1008                 if (list_empty(&ds_work_list))
1009                         schedule();
1010                 finish_wait(&ds_wait, &wait);
1011
1012                 if (kthread_should_stop())
1013                         break;
1014
1015                 process_ds_work();
1016         }
1017
1018         return 0;
1019 }
1020
1021 static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len)
1022 {
1023         struct ds_data *dpkt = (struct ds_data *) pkt;
1024         struct ds_queue_entry *qp;
1025
1026         qp = kmalloc(sizeof(struct ds_queue_entry) + len, GFP_ATOMIC);
1027         if (!qp) {
1028                 __send_ds_nack(dp, dpkt->handle);
1029         } else {
1030                 qp->dp = dp;
1031                 memcpy(&qp->req, pkt, len);
1032                 list_add_tail(&qp->list, &ds_work_list);
1033                 wake_up(&ds_wait);
1034         }
1035         return 0;
1036 }
1037
1038 static void ds_up(struct ds_info *dp)
1039 {
1040         struct ldc_channel *lp = dp->lp;
1041         struct ds_ver_req req;
1042         int err;
1043
1044         req.tag.type = DS_INIT_REQ;
1045         req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag);
1046         req.ver.major = 1;
1047         req.ver.minor = 0;
1048
1049         err = __ds_send(lp, &req, sizeof(req));
1050         if (err > 0)
1051                 dp->hs_state = DS_HS_START;
1052 }
1053
1054 static void ds_reset(struct ds_info *dp)
1055 {
1056         int i;
1057
1058         dp->hs_state = 0;
1059
1060         for (i = 0; i < dp->num_ds_states; i++) {
1061                 struct ds_cap_state *cp = &dp->ds_states[i];
1062
1063                 cp->state = CAP_STATE_UNKNOWN;
1064         }
1065 }
1066
1067 static void ds_event(void *arg, int event)
1068 {
1069         struct ds_info *dp = arg;
1070         struct ldc_channel *lp = dp->lp;
1071         unsigned long flags;
1072         int err;
1073
1074         spin_lock_irqsave(&ds_lock, flags);
1075
1076         if (event == LDC_EVENT_UP) {
1077                 ds_up(dp);
1078                 spin_unlock_irqrestore(&ds_lock, flags);
1079                 return;
1080         }
1081
1082         if (event == LDC_EVENT_RESET) {
1083                 ds_reset(dp);
1084                 spin_unlock_irqrestore(&ds_lock, flags);
1085                 return;
1086         }
1087
1088         if (event != LDC_EVENT_DATA_READY) {
1089                 printk(KERN_WARNING "ds-%llu: Unexpected LDC event %d\n",
1090                        dp->id, event);
1091                 spin_unlock_irqrestore(&ds_lock, flags);
1092                 return;
1093         }
1094
1095         err = 0;
1096         while (1) {
1097                 struct ds_msg_tag *tag;
1098
1099                 err = ldc_read(lp, dp->rcv_buf, sizeof(*tag));
1100
1101                 if (unlikely(err < 0)) {
1102                         if (err == -ECONNRESET)
1103                                 ds_conn_reset(dp);
1104                         break;
1105                 }
1106                 if (err == 0)
1107                         break;
1108
1109                 tag = dp->rcv_buf;
1110                 err = ldc_read(lp, tag + 1, tag->len);
1111
1112                 if (unlikely(err < 0)) {
1113                         if (err == -ECONNRESET)
1114                                 ds_conn_reset(dp);
1115                         break;
1116                 }
1117                 if (err < tag->len)
1118                         break;
1119
1120                 if (tag->type < DS_DATA)
1121                         err = ds_handshake(dp, dp->rcv_buf);
1122                 else
1123                         err = ds_data(dp, dp->rcv_buf,
1124                                       sizeof(*tag) + err);
1125                 if (err == -ECONNRESET)
1126                         break;
1127         }
1128
1129         spin_unlock_irqrestore(&ds_lock, flags);
1130 }
1131
1132 static int __devinit ds_probe(struct vio_dev *vdev,
1133                               const struct vio_device_id *id)
1134 {
1135         static int ds_version_printed;
1136         struct ldc_channel_config ds_cfg = {
1137                 .event          = ds_event,
1138                 .mtu            = 4096,
1139                 .mode           = LDC_MODE_STREAM,
1140         };
1141         struct mdesc_handle *hp;
1142         struct ldc_channel *lp;
1143         struct ds_info *dp;
1144         const u64 *val;
1145         int err, i;
1146
1147         if (ds_version_printed++ == 0)
1148                 printk(KERN_INFO "%s", version);
1149
1150         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1151         err = -ENOMEM;
1152         if (!dp)
1153                 goto out_err;
1154
1155         hp = mdesc_grab();
1156         val = mdesc_get_property(hp, vdev->mp, "id", NULL);
1157         if (val)
1158                 dp->id = *val;
1159         mdesc_release(hp);
1160
1161         dp->rcv_buf = kzalloc(4096, GFP_KERNEL);
1162         if (!dp->rcv_buf)
1163                 goto out_free_dp;
1164
1165         dp->rcv_buf_len = 4096;
1166
1167         dp->ds_states = kzalloc(sizeof(ds_states_template),
1168                                 GFP_KERNEL);
1169         if (!dp->ds_states)
1170                 goto out_free_rcv_buf;
1171
1172         memcpy(dp->ds_states, ds_states_template,
1173                sizeof(ds_states_template));
1174         dp->num_ds_states = ARRAY_SIZE(ds_states_template);
1175
1176         for (i = 0; i < dp->num_ds_states; i++)
1177                 dp->ds_states[i].handle = ((u64)i << 32);
1178
1179         ds_cfg.tx_irq = vdev->tx_irq;
1180         ds_cfg.rx_irq = vdev->rx_irq;
1181
1182         lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp);
1183         if (IS_ERR(lp)) {
1184                 err = PTR_ERR(lp);
1185                 goto out_free_ds_states;
1186         }
1187         dp->lp = lp;
1188
1189         err = ldc_bind(lp, "DS");
1190         if (err)
1191                 goto out_free_ldc;
1192
1193         spin_lock_irq(&ds_lock);
1194         dp->next = ds_info_list;
1195         ds_info_list = dp;
1196         spin_unlock_irq(&ds_lock);
1197
1198         return err;
1199
1200 out_free_ldc:
1201         ldc_free(dp->lp);
1202
1203 out_free_ds_states:
1204         kfree(dp->ds_states);
1205
1206 out_free_rcv_buf:
1207         kfree(dp->rcv_buf);
1208
1209 out_free_dp:
1210         kfree(dp);
1211
1212 out_err:
1213         return err;
1214 }
1215
1216 static int ds_remove(struct vio_dev *vdev)
1217 {
1218         return 0;
1219 }
1220
1221 static const struct vio_device_id ds_match[] = {
1222         {
1223                 .type = "domain-services-port",
1224         },
1225         {},
1226 };
1227
1228 static struct vio_driver ds_driver = {
1229         .id_table       = ds_match,
1230         .probe          = ds_probe,
1231         .remove         = ds_remove,
1232         .driver         = {
1233                 .name   = "ds",
1234                 .owner  = THIS_MODULE,
1235         }
1236 };
1237
1238 static int __init ds_init(void)
1239 {
1240         kthread_run(ds_thread, NULL, "kldomd");
1241
1242         return vio_register_driver(&ds_driver);
1243 }
1244
1245 subsys_initcall(ds_init);