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   1 /* ds.c: Domain Services driver for Logical Domains
   2  *
   3  * Copyright (C) 2007 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 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-%lu: 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-%lu: 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-%lu: 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_mask(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 = cpus_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_fill_in_cpu_data(*mask);
 548
 549         for_each_cpu_mask(cpu, *mask) {
 550                 int err;
 551
 552                 printk(KERN_INFO "ds-%lu: Starting cpu %d...\n",
 553                        dp->id, cpu);
 554                 err = cpu_up(cpu);
 555                 if (err) {
 556                         __u32 res = DR_CPU_RES_FAILURE;
 557                         __u32 stat = DR_CPU_STAT_UNCONFIGURED;
 558
 559                         if (!cpu_present(cpu)) {
 560                                 /* CPU not present in MD */
 561                                 res = DR_CPU_RES_NOT_IN_MD;
 562                                 stat = DR_CPU_STAT_NOT_PRESENT;
 563                         } else if (err == -ENODEV) {
 564                                 /* CPU did not call in successfully */
 565                                 res = DR_CPU_RES_CPU_NOT_RESPONDING;
 566                         }
 567
 568                         printk(KERN_INFO "ds-%lu: CPU startup failed err=%d\n",
 569                                dp->id, err);
 570                         dr_cpu_mark(resp, cpu, ncpus, res, stat);
 571                 }
 572         }
 573
 574         spin_lock_irqsave(&ds_lock, flags);
 575         __ds_send(dp->lp, resp, resp_len);
 576         spin_unlock_irqrestore(&ds_lock, flags);
 577
 578         kfree(resp);
 579
 580         /* Redistribute IRQs, taking into account the new cpus.  */
 581         fixup_irqs();
 582
 583         return 0;
 584 }
 585
 586 static int dr_cpu_unconfigure(struct ds_info *dp,
 587                               struct ds_cap_state *cp,
 588                               u64 req_num,
 589                               cpumask_t *mask)
 590 {
 591         struct ds_data *resp;
 592         int resp_len, ncpus, cpu;
 593         unsigned long flags;
 594
 595         ncpus = cpus_weight(*mask);
 596         resp_len = dr_cpu_size_response(ncpus);
 597         resp = kzalloc(resp_len, GFP_KERNEL);
 598         if (!resp)
 599                 return -ENOMEM;
 600
 601         dr_cpu_init_response(resp, req_num, cp->handle,
 602                              resp_len, ncpus, mask,
 603                              DR_CPU_STAT_UNCONFIGURED);
 604
 605         for_each_cpu_mask(cpu, *mask) {
 606                 int err;
 607
 608                 printk(KERN_INFO "ds-%lu: Shutting down cpu %d...\n",
 609                        dp->id, cpu);
 610                 err = cpu_down(cpu);
 611                 if (err)
 612                         dr_cpu_mark(resp, cpu, ncpus,
 613                                     DR_CPU_RES_FAILURE,
 614                                     DR_CPU_STAT_CONFIGURED);
 615         }
 616
 617         spin_lock_irqsave(&ds_lock, flags);
 618         __ds_send(dp->lp, resp, resp_len);
 619         spin_unlock_irqrestore(&ds_lock, flags);
 620
 621         kfree(resp);
 622
 623         return 0;
 624 }
 625
 626 static void __cpuinit dr_cpu_data(struct ds_info *dp,
 627                                   struct ds_cap_state *cp,
 628                                   void *buf, int len)
 629 {
 630         struct ds_data *data = buf;
 631         struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
 632         u32 *cpu_list = (u32 *) (tag + 1);
 633         u64 req_num = tag->req_num;
 634         cpumask_t mask;
 635         unsigned int i;
 636         int err;
 637
 638         switch (tag->type) {
 639         case DR_CPU_CONFIGURE:
 640         case DR_CPU_UNCONFIGURE:
 641         case DR_CPU_FORCE_UNCONFIGURE:
 642                 break;
 643
 644         default:
 645                 dr_cpu_send_error(dp, cp, data);
 646                 return;
 647         }
 648
 649         purge_dups(cpu_list, tag->num_records);
 650
 651         cpus_clear(mask);
 652         for (i = 0; i < tag->num_records; i++) {
 653                 if (cpu_list[i] == CPU_SENTINEL)
 654                         continue;
 655
 656                 if (cpu_list[i] < NR_CPUS)
 657                         cpu_set(cpu_list[i], mask);
 658         }
 659
 660         if (tag->type == DR_CPU_CONFIGURE)
 661                 err = dr_cpu_configure(dp, cp, req_num, &mask);
 662         else
 663                 err = dr_cpu_unconfigure(dp, cp, req_num, &mask);
 664
 665         if (err)
 666                 dr_cpu_send_error(dp, cp, data);
 667 }
 668 #endif /* CONFIG_HOTPLUG_CPU */
 669
 670 struct ds_pri_msg {
 671         __u64                           req_num;
 672         __u64                           type;
 673 #define DS_PRI_REQUEST                  0x00
 674 #define DS_PRI_DATA                     0x01
 675 #define DS_PRI_UPDATE                   0x02
 676 };
 677
 678 static void ds_pri_data(struct ds_info *dp,
 679                         struct ds_cap_state *cp,
 680                         void *buf, int len)
 681 {
 682         struct ds_data *dpkt = buf;
 683         struct ds_pri_msg *rp;
 684
 685         rp = (struct ds_pri_msg *) (dpkt + 1);
 686
 687         printk(KERN_INFO "ds-%lu: PRI REQ [%lx:%lx], len=%d\n",
 688                dp->id, rp->req_num, rp->type, len);
 689 }
 690
 691 struct ds_var_hdr {
 692         __u32                           type;
 693 #define DS_VAR_SET_REQ                  0x00
 694 #define DS_VAR_DELETE_REQ               0x01
 695 #define DS_VAR_SET_RESP                 0x02
 696 #define DS_VAR_DELETE_RESP              0x03
 697 };
 698
 699 struct ds_var_set_msg {
 700         struct ds_var_hdr               hdr;
 701         char                            name_and_value[0];
 702 };
 703
 704 struct ds_var_delete_msg {
 705         struct ds_var_hdr               hdr;
 706         char                            name[0];
 707 };
 708
 709 struct ds_var_resp {
 710         struct ds_var_hdr               hdr;
 711         __u32                           result;
 712 #define DS_VAR_SUCCESS                  0x00
 713 #define DS_VAR_NO_SPACE                 0x01
 714 #define DS_VAR_INVALID_VAR              0x02
 715 #define DS_VAR_INVALID_VAL              0x03
 716 #define DS_VAR_NOT_PRESENT              0x04
 717 };
 718
 719 static DEFINE_MUTEX(ds_var_mutex);
 720 static int ds_var_doorbell;
 721 static int ds_var_response;
 722
 723 static void ds_var_data(struct ds_info *dp,
 724                         struct ds_cap_state *cp,
 725                         void *buf, int len)
 726 {
 727         struct ds_data *dpkt = buf;
 728         struct ds_var_resp *rp;
 729
 730         rp = (struct ds_var_resp *) (dpkt + 1);
 731
 732         if (rp->hdr.type != DS_VAR_SET_RESP &&
 733             rp->hdr.type != DS_VAR_DELETE_RESP)
 734                 return;
 735
 736         ds_var_response = rp->result;
 737         wmb();
 738         ds_var_doorbell = 1;
 739 }
 740
 741 void ldom_set_var(const char *var, const char *value)
 742 {
 743         struct ds_cap_state *cp;
 744         struct ds_info *dp;
 745         unsigned long flags;
 746
 747         spin_lock_irqsave(&ds_lock, flags);
 748         cp = NULL;
 749         for (dp = ds_info_list; dp; dp = dp->next) {
 750                 struct ds_cap_state *tmp;
 751
 752                 tmp = find_cap_by_string(dp, "var-config");
 753                 if (tmp && tmp->state == CAP_STATE_REGISTERED) {
 754                         cp = tmp;
 755                         break;
 756                 }
 757         }
 758         if (!cp) {
 759                 for (dp = ds_info_list; dp; dp = dp->next) {
 760                         struct ds_cap_state *tmp;
 761
 762                         tmp = find_cap_by_string(dp, "var-config-backup");
 763                         if (tmp && tmp->state == CAP_STATE_REGISTERED) {
 764                                 cp = tmp;
 765                                 break;
 766                         }
 767                 }
 768         }
 769         spin_unlock_irqrestore(&ds_lock, flags);
 770
 771         if (cp) {
 772                 union {
 773                         struct {
 774                                 struct ds_data          data;
 775                                 struct ds_var_set_msg   msg;
 776                         } header;
 777                         char                    all[512];
 778                 } pkt;
 779                 char  *base, *p;
 780                 int msg_len, loops;
 781
 782                 memset(&pkt, 0, sizeof(pkt));
 783                 pkt.header.data.tag.type = DS_DATA;
 784                 pkt.header.data.handle = cp->handle;
 785                 pkt.header.msg.hdr.type = DS_VAR_SET_REQ;
 786                 base = p = &pkt.header.msg.name_and_value[0];
 787                 strcpy(p, var);
 788                 p += strlen(var) + 1;
 789                 strcpy(p, value);
 790                 p += strlen(value) + 1;
 791
 792                 msg_len = (sizeof(struct ds_data) +
 793                            sizeof(struct ds_var_set_msg) +
 794                            (p - base));
 795                 msg_len = (msg_len + 3) & ~3;
 796                 pkt.header.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
 797
 798                 mutex_lock(&ds_var_mutex);
 799
 800                 spin_lock_irqsave(&ds_lock, flags);
 801                 ds_var_doorbell = 0;
 802                 ds_var_response = -1;
 803
 804                 __ds_send(dp->lp, &pkt, msg_len);
 805                 spin_unlock_irqrestore(&ds_lock, flags);
 806
 807                 loops = 1000;
 808                 while (ds_var_doorbell == 0) {
 809                         if (loops-- < 0)
 810                                 break;
 811                         barrier();
 812                         udelay(100);
 813                 }
 814
 815                 mutex_unlock(&ds_var_mutex);
 816
 817                 if (ds_var_doorbell == 0 ||
 818                     ds_var_response != DS_VAR_SUCCESS)
 819                         printk(KERN_ERR "ds-%lu: var-config [%s:%s] "
 820                                "failed, response(%d).\n",
 821                                dp->id, var, value,
 822                                ds_var_response);
 823         } else {
 824                 printk(KERN_ERR PFX "var-config not registered so "
 825                        "could not set (%s) variable to (%s).\n",
 826                        var, value);
 827         }
 828 }
 829
 830 void ldom_reboot(const char *boot_command)
 831 {
 832         /* Don't bother with any of this if the boot_command
 833          * is empty.
 834          */
 835         if (boot_command && strlen(boot_command)) {
 836                 char full_boot_str[256];
 837
 838                 strcpy(full_boot_str, "boot ");
 839                 strcpy(full_boot_str + strlen("boot "), boot_command);
 840
 841                 ldom_set_var("reboot-command", full_boot_str);
 842         }
 843         sun4v_mach_sir();
 844 }
 845
 846 void ldom_power_off(void)
 847 {
 848         sun4v_mach_exit(0);
 849 }
 850
 851 static void ds_conn_reset(struct ds_info *dp)
 852 {
 853         printk(KERN_ERR "ds-%lu: ds_conn_reset() from %p\n",
 854                dp->id, __builtin_return_address(0));
 855 }
 856
 857 static int register_services(struct ds_info *dp)
 858 {
 859         struct ldc_channel *lp = dp->lp;
 860         int i;
 861
 862         for (i = 0; i < dp->num_ds_states; i++) {
 863                 struct {
 864                         struct ds_reg_req req;
 865                         u8 id_buf[256];
 866                 } pbuf;
 867                 struct ds_cap_state *cp = &dp->ds_states[i];
 868                 int err, msg_len;
 869                 u64 new_count;
 870
 871                 if (cp->state == CAP_STATE_REGISTERED)
 872                         continue;
 873
 874                 new_count = sched_clock() & 0xffffffff;
 875                 cp->handle = ((u64) i << 32) | new_count;
 876
 877                 msg_len = (sizeof(struct ds_reg_req) +
 878                            strlen(cp->service_id));
 879
 880                 memset(&pbuf, 0, sizeof(pbuf));
 881                 pbuf.req.tag.type = DS_REG_REQ;
 882                 pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag));
 883                 pbuf.req.handle = cp->handle;
 884                 pbuf.req.major = 1;
 885                 pbuf.req.minor = 0;
 886                 strcpy(pbuf.req.svc_id, cp->service_id);
 887
 888                 err = __ds_send(lp, &pbuf, msg_len);
 889                 if (err > 0)
 890                         cp->state = CAP_STATE_REG_SENT;
 891         }
 892         return 0;
 893 }
 894
 895 static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt)
 896 {
 897
 898         if (dp->hs_state == DS_HS_START) {
 899                 if (pkt->type != DS_INIT_ACK)
 900                         goto conn_reset;
 901
 902                 dp->hs_state = DS_HS_DONE;
 903
 904                 return register_services(dp);
 905         }
 906
 907         if (dp->hs_state != DS_HS_DONE)
 908                 goto conn_reset;
 909
 910         if (pkt->type == DS_REG_ACK) {
 911                 struct ds_reg_ack *ap = (struct ds_reg_ack *) pkt;
 912                 struct ds_cap_state *cp = find_cap(dp, ap->handle);
 913
 914                 if (!cp) {
 915                         printk(KERN_ERR "ds-%lu: REG ACK for unknown "
 916                                "handle %lx\n", dp->id, ap->handle);
 917                         return 0;
 918                 }
 919                 printk(KERN_INFO "ds-%lu: Registered %s service.\n",
 920                        dp->id, cp->service_id);
 921                 cp->state = CAP_STATE_REGISTERED;
 922         } else if (pkt->type == DS_REG_NACK) {
 923                 struct ds_reg_nack *np = (struct ds_reg_nack *) pkt;
 924                 struct ds_cap_state *cp = find_cap(dp, np->handle);
 925
 926                 if (!cp) {
 927                         printk(KERN_ERR "ds-%lu: REG NACK for "
 928                                "unknown handle %lx\n",
 929                                dp->id, np->handle);
 930                         return 0;
 931                 }
 932                 cp->state = CAP_STATE_UNKNOWN;
 933         }
 934
 935         return 0;
 936
 937 conn_reset:
 938         ds_conn_reset(dp);
 939         return -ECONNRESET;
 940 }
 941
 942 static void __send_ds_nack(struct ds_info *dp, u64 handle)
 943 {
 944         struct ds_data_nack nack = {
 945                 .tag = {
 946                         .type = DS_NACK,
 947                         .len = (sizeof(struct ds_data_nack) -
 948                                 sizeof(struct ds_msg_tag)),
 949                 },
 950                 .handle = handle,
 951                 .result = DS_INV_HDL,
 952         };
 953
 954         __ds_send(dp->lp, &nack, sizeof(nack));
 955 }
 956
 957 static LIST_HEAD(ds_work_list);
 958 static DECLARE_WAIT_QUEUE_HEAD(ds_wait);
 959
 960 struct ds_queue_entry {
 961         struct list_head                list;
 962         struct ds_info                  *dp;
 963         int                             req_len;
 964         int                             __pad;
 965         u64                             req[0];
 966 };
 967
 968 static void process_ds_work(void)
 969 {
 970         struct ds_queue_entry *qp, *tmp;
 971         unsigned long flags;
 972         LIST_HEAD(todo);
 973
 974         spin_lock_irqsave(&ds_lock, flags);
 975         list_splice_init(&ds_work_list, &todo);
 976         spin_unlock_irqrestore(&ds_lock, flags);
 977
 978         list_for_each_entry_safe(qp, tmp, &todo, list) {
 979                 struct ds_data *dpkt = (struct ds_data *) qp->req;
 980                 struct ds_info *dp = qp->dp;
 981                 struct ds_cap_state *cp = find_cap(dp, dpkt->handle);
 982                 int req_len = qp->req_len;
 983
 984                 if (!cp) {
 985                         printk(KERN_ERR "ds-%lu: Data for unknown "
 986                                "handle %lu\n",
 987                                dp->id, dpkt->handle);
 988
 989                         spin_lock_irqsave(&ds_lock, flags);
 990                         __send_ds_nack(dp, dpkt->handle);
 991                         spin_unlock_irqrestore(&ds_lock, flags);
 992                 } else {
 993                         cp->data(dp, cp, dpkt, req_len);
 994                 }
 995
 996                 list_del(&qp->list);
 997                 kfree(qp);
 998         }
 999 }
1000
1001 static int ds_thread(void *__unused)
1002 {
1003         DEFINE_WAIT(wait);
1004
1005         while (1) {
1006                 prepare_to_wait(&ds_wait, &wait, TASK_INTERRUPTIBLE);
1007                 if (list_empty(&ds_work_list))
1008                         schedule();
1009                 finish_wait(&ds_wait, &wait);
1010
1011                 if (kthread_should_stop())
1012                         break;
1013
1014                 process_ds_work();
1015         }
1016
1017         return 0;
1018 }
1019
1020 static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len)
1021 {
1022         struct ds_data *dpkt = (struct ds_data *) pkt;
1023         struct ds_queue_entry *qp;
1024
1025         qp = kmalloc(sizeof(struct ds_queue_entry) + len, GFP_ATOMIC);
1026         if (!qp) {
1027                 __send_ds_nack(dp, dpkt->handle);
1028         } else {
1029                 qp->dp = dp;
1030                 memcpy(&qp->req, pkt, len);
1031                 list_add_tail(&qp->list, &ds_work_list);
1032                 wake_up(&ds_wait);
1033         }
1034         return 0;
1035 }
1036
1037 static void ds_up(struct ds_info *dp)
1038 {
1039         struct ldc_channel *lp = dp->lp;
1040         struct ds_ver_req req;
1041         int err;
1042
1043         req.tag.type = DS_INIT_REQ;
1044         req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag);
1045         req.ver.major = 1;
1046         req.ver.minor = 0;
1047
1048         err = __ds_send(lp, &req, sizeof(req));
1049         if (err > 0)
1050                 dp->hs_state = DS_HS_START;
1051 }
1052
1053 static void ds_reset(struct ds_info *dp)
1054 {
1055         int i;
1056
1057         dp->hs_state = 0;
1058
1059         for (i = 0; i < dp->num_ds_states; i++) {
1060                 struct ds_cap_state *cp = &dp->ds_states[i];
1061
1062                 cp->state = CAP_STATE_UNKNOWN;
1063         }
1064 }
1065
1066 static void ds_event(void *arg, int event)
1067 {
1068         struct ds_info *dp = arg;
1069         struct ldc_channel *lp = dp->lp;
1070         unsigned long flags;
1071         int err;
1072
1073         spin_lock_irqsave(&ds_lock, flags);
1074
1075         if (event == LDC_EVENT_UP) {
1076                 ds_up(dp);
1077                 spin_unlock_irqrestore(&ds_lock, flags);
1078                 return;
1079         }
1080
1081         if (event == LDC_EVENT_RESET) {
1082                 ds_reset(dp);
1083                 spin_unlock_irqrestore(&ds_lock, flags);
1084                 return;
1085         }
1086
1087         if (event != LDC_EVENT_DATA_READY) {
1088                 printk(KERN_WARNING "ds-%lu: Unexpected LDC event %d\n",
1089                        dp->id, event);
1090                 spin_unlock_irqrestore(&ds_lock, flags);
1091                 return;
1092         }
1093
1094         err = 0;
1095         while (1) {
1096                 struct ds_msg_tag *tag;
1097
1098                 err = ldc_read(lp, dp->rcv_buf, sizeof(*tag));
1099
1100                 if (unlikely(err < 0)) {
1101                         if (err == -ECONNRESET)
1102                                 ds_conn_reset(dp);
1103                         break;
1104                 }
1105                 if (err == 0)
1106                         break;
1107
1108                 tag = dp->rcv_buf;
1109                 err = ldc_read(lp, tag + 1, tag->len);
1110
1111                 if (unlikely(err < 0)) {
1112                         if (err == -ECONNRESET)
1113                                 ds_conn_reset(dp);
1114                         break;
1115                 }
1116                 if (err < tag->len)
1117                         break;
1118
1119                 if (tag->type < DS_DATA)
1120                         err = ds_handshake(dp, dp->rcv_buf);
1121                 else
1122                         err = ds_data(dp, dp->rcv_buf,
1123                                       sizeof(*tag) + err);
1124                 if (err == -ECONNRESET)
1125                         break;
1126         }
1127
1128         spin_unlock_irqrestore(&ds_lock, flags);
1129 }
1130
1131 static int __devinit ds_probe(struct vio_dev *vdev,
1132                               const struct vio_device_id *id)
1133 {
1134         static int ds_version_printed;
1135         struct ldc_channel_config ds_cfg = {
1136                 .event          = ds_event,
1137                 .mtu            = 4096,
1138                 .mode           = LDC_MODE_STREAM,
1139         };
1140         struct mdesc_handle *hp;
1141         struct ldc_channel *lp;
1142         struct ds_info *dp;
1143         const u64 *val;
1144         int err, i;
1145
1146         if (ds_version_printed++ == 0)
1147                 printk(KERN_INFO "%s", version);
1148
1149         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1150         err = -ENOMEM;
1151         if (!dp)
1152                 goto out_err;
1153
1154         hp = mdesc_grab();
1155         val = mdesc_get_property(hp, vdev->mp, "id", NULL);
1156         if (val)
1157                 dp->id = *val;
1158         mdesc_release(hp);
1159
1160         dp->rcv_buf = kzalloc(4096, GFP_KERNEL);
1161         if (!dp->rcv_buf)
1162                 goto out_free_dp;
1163
1164         dp->rcv_buf_len = 4096;
1165
1166         dp->ds_states = kzalloc(sizeof(ds_states_template),
1167                                 GFP_KERNEL);
1168         if (!dp->ds_states)
1169                 goto out_free_rcv_buf;
1170
1171         memcpy(dp->ds_states, ds_states_template,
1172                sizeof(ds_states_template));
1173         dp->num_ds_states = ARRAY_SIZE(ds_states_template);
1174
1175         for (i = 0; i < dp->num_ds_states; i++)
1176                 dp->ds_states[i].handle = ((u64)i << 32);
1177
1178         ds_cfg.tx_irq = vdev->tx_irq;
1179         ds_cfg.rx_irq = vdev->rx_irq;
1180
1181         lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp);
1182         if (IS_ERR(lp)) {
1183                 err = PTR_ERR(lp);
1184                 goto out_free_ds_states;
1185         }
1186         dp->lp = lp;
1187
1188         err = ldc_bind(lp, "DS");
1189         if (err)
1190                 goto out_free_ldc;
1191
1192         spin_lock_irq(&ds_lock);
1193         dp->next = ds_info_list;
1194         ds_info_list = dp;
1195         spin_unlock_irq(&ds_lock);
1196
1197         return err;
1198
1199 out_free_ldc:
1200         ldc_free(dp->lp);
1201
1202 out_free_ds_states:
1203         kfree(dp->ds_states);
1204
1205 out_free_rcv_buf:
1206         kfree(dp->rcv_buf);
1207
1208 out_free_dp:
1209         kfree(dp);
1210
1211 out_err:
1212         return err;
1213 }
1214
1215 static int ds_remove(struct vio_dev *vdev)
1216 {
1217         return 0;
1218 }
1219
1220 static struct vio_device_id ds_match[] = {
1221         {
1222                 .type = "domain-services-port",
1223         },
1224         {},
1225 };
1226
1227 static struct vio_driver ds_driver = {
1228         .id_table       = ds_match,
1229         .probe          = ds_probe,
1230         .remove         = ds_remove,
1231         .driver         = {
1232                 .name   = "ds",
1233                 .owner  = THIS_MODULE,
1234         }
1235 };
1236
1237 static int __init ds_init(void)
1238 {
1239         kthread_run(ds_thread, NULL, "kldomd");
1240
1241         return vio_register_driver(&ds_driver);
1242 }
1243
1244 subsys_initcall(ds_init);