arch/sparc/kernel/ds.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* ds.c: Domain Services driver for Logical Domains
   3  *
   4  * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/module.h>
   9 #include <linux/types.h>
  10 #include <linux/string.h>
  11 #include <linux/slab.h>
  12 #include <linux/sched.h>
  13 #include <linux/sched/clock.h>
  14 #include <linux/delay.h>
  15 #include <linux/mutex.h>
  16 #include <linux/kthread.h>
  17 #include <linux/reboot.h>
  18 #include <linux/cpu.h>
  19
  20 #include <asm/hypervisor.h>
  21 #include <asm/ldc.h>
  22 #include <asm/vio.h>
  23 #include <asm/mdesc.h>
  24 #include <asm/head.h>
  25 #include <asm/irq.h>
  26
  27 #include "kernel.h"
  28
  29 #define DRV_MODULE_NAME         "ds"
  30 #define PFX DRV_MODULE_NAME     ": "
  31 #define DRV_MODULE_VERSION      "1.0"
  32 #define DRV_MODULE_RELDATE      "Jul 11, 2007"
  33
  34 static char version[] =
  35         DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  36 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
  37 MODULE_DESCRIPTION("Sun LDOM domain services driver");
  38 MODULE_LICENSE("GPL");
  39 MODULE_VERSION(DRV_MODULE_VERSION);
  40
  41 struct ds_msg_tag {
  42         __u32                   type;
  43 #define DS_INIT_REQ             0x00
  44 #define DS_INIT_ACK             0x01
  45 #define DS_INIT_NACK            0x02
  46 #define DS_REG_REQ              0x03
  47 #define DS_REG_ACK              0x04
  48 #define DS_REG_NACK             0x05
  49 #define DS_UNREG_REQ            0x06
  50 #define DS_UNREG_ACK            0x07
  51 #define DS_UNREG_NACK           0x08
  52 #define DS_DATA                 0x09
  53 #define DS_NACK                 0x0a
  54
  55         __u32                   len;
  56 };
  57
  58 /* Result codes */
  59 #define DS_OK                   0x00
  60 #define DS_REG_VER_NACK         0x01
  61 #define DS_REG_DUP              0x02
  62 #define DS_INV_HDL              0x03
  63 #define DS_TYPE_UNKNOWN         0x04
  64
  65 struct ds_version {
  66         __u16                   major;
  67         __u16                   minor;
  68 };
  69
  70 struct ds_ver_req {
  71         struct ds_msg_tag       tag;
  72         struct ds_version       ver;
  73 };
  74
  75 struct ds_ver_ack {
  76         struct ds_msg_tag       tag;
  77         __u16                   minor;
  78 };
  79
  80 struct ds_ver_nack {
  81         struct ds_msg_tag       tag;
  82         __u16                   major;
  83 };
  84
  85 struct ds_reg_req {
  86         struct ds_msg_tag       tag;
  87         __u64                   handle;
  88         __u16                   major;
  89         __u16                   minor;
  90         char                    svc_id[];
  91 };
  92
  93 struct ds_reg_ack {
  94         struct ds_msg_tag       tag;
  95         __u64                   handle;
  96         __u16                   minor;
  97 };
  98
  99 struct ds_reg_nack {
 100         struct ds_msg_tag       tag;
 101         __u64                   handle;
 102         __u16                   major;
 103 };
 104
 105 struct ds_unreg_req {
 106         struct ds_msg_tag       tag;
 107         __u64                   handle;
 108 };
 109
 110 struct ds_unreg_ack {
 111         struct ds_msg_tag       tag;
 112         __u64                   handle;
 113 };
 114
 115 struct ds_unreg_nack {
 116         struct ds_msg_tag       tag;
 117         __u64                   handle;
 118 };
 119
 120 struct ds_data {
 121         struct ds_msg_tag       tag;
 122         __u64                   handle;
 123 };
 124
 125 struct ds_data_nack {
 126         struct ds_msg_tag       tag;
 127         __u64                   handle;
 128         __u64                   result;
 129 };
 130
 131 struct ds_info;
 132 struct ds_cap_state {
 133         __u64                   handle;
 134
 135         void                    (*data)(struct ds_info *dp,
 136                                         struct ds_cap_state *cp,
 137                                         void *buf, int len);
 138
 139         const char              *service_id;
 140
 141         u8                      state;
 142 #define CAP_STATE_UNKNOWN       0x00
 143 #define CAP_STATE_REG_SENT      0x01
 144 #define CAP_STATE_REGISTERED    0x02
 145 };
 146
 147 static void md_update_data(struct ds_info *dp, struct ds_cap_state *cp,
 148                            void *buf, int len);
 149 static void domain_shutdown_data(struct ds_info *dp,
 150                                  struct ds_cap_state *cp,
 151                                  void *buf, int len);
 152 static void domain_panic_data(struct ds_info *dp,
 153                               struct ds_cap_state *cp,
 154                               void *buf, int len);
 155 #ifdef CONFIG_HOTPLUG_CPU
 156 static void dr_cpu_data(struct ds_info *dp,
 157                         struct ds_cap_state *cp,
 158                         void *buf, int len);
 159 #endif
 160 static void ds_pri_data(struct ds_info *dp,
 161                         struct ds_cap_state *cp,
 162                         void *buf, int len);
 163 static void ds_var_data(struct ds_info *dp,
 164                         struct ds_cap_state *cp,
 165                         void *buf, int len);
 166
 167 static struct ds_cap_state ds_states_template[] = {
 168         {
 169                 .service_id     = "md-update",
 170                 .data           = md_update_data,
 171         },
 172         {
 173                 .service_id     = "domain-shutdown",
 174                 .data           = domain_shutdown_data,
 175         },
 176         {
 177                 .service_id     = "domain-panic",
 178                 .data           = domain_panic_data,
 179         },
 180 #ifdef CONFIG_HOTPLUG_CPU
 181         {
 182                 .service_id     = "dr-cpu",
 183                 .data           = dr_cpu_data,
 184         },
 185 #endif
 186         {
 187                 .service_id     = "pri",
 188                 .data           = ds_pri_data,
 189         },
 190         {
 191                 .service_id     = "var-config",
 192                 .data           = ds_var_data,
 193         },
 194         {
 195                 .service_id     = "var-config-backup",
 196                 .data           = ds_var_data,
 197         },
 198 };
 199
 200 static DEFINE_SPINLOCK(ds_lock);
 201
 202 struct ds_info {
 203         struct ldc_channel      *lp;
 204         u8                      hs_state;
 205 #define DS_HS_START             0x01
 206 #define DS_HS_DONE              0x02
 207
 208         u64                     id;
 209
 210         void                    *rcv_buf;
 211         int                     rcv_buf_len;
 212
 213         struct ds_cap_state     *ds_states;
 214         int                     num_ds_states;
 215
 216         struct ds_info          *next;
 217 };
 218
 219 static struct ds_info *ds_info_list;
 220
 221 static struct ds_cap_state *find_cap(struct ds_info *dp, u64 handle)
 222 {
 223         unsigned int index = handle >> 32;
 224
 225         if (index >= dp->num_ds_states)
 226                 return NULL;
 227         return &dp->ds_states[index];
 228 }
 229
 230 static struct ds_cap_state *find_cap_by_string(struct ds_info *dp,
 231                                                const char *name)
 232 {
 233         int i;
 234
 235         for (i = 0; i < dp->num_ds_states; i++) {
 236                 if (strcmp(dp->ds_states[i].service_id, name))
 237                         continue;
 238
 239                 return &dp->ds_states[i];
 240         }
 241         return NULL;
 242 }
 243
 244 static int __ds_send(struct ldc_channel *lp, void *data, int len)
 245 {
 246         int err, limit = 1000;
 247
 248         err = -EINVAL;
 249         while (limit-- > 0) {
 250                 err = ldc_write(lp, data, len);
 251                 if (!err || (err != -EAGAIN))
 252                         break;
 253                 udelay(1);
 254         }
 255
 256         return err;
 257 }
 258
 259 static int ds_send(struct ldc_channel *lp, void *data, int len)
 260 {
 261         unsigned long flags;
 262         int err;
 263
 264         spin_lock_irqsave(&ds_lock, flags);
 265         err = __ds_send(lp, data, len);
 266         spin_unlock_irqrestore(&ds_lock, flags);
 267
 268         return err;
 269 }
 270
 271 struct ds_md_update_req {
 272         __u64                           req_num;
 273 };
 274
 275 struct ds_md_update_res {
 276         __u64                           req_num;
 277         __u32                           result;
 278 };
 279
 280 static void md_update_data(struct ds_info *dp,
 281                            struct ds_cap_state *cp,
 282                            void *buf, int len)
 283 {
 284         struct ldc_channel *lp = dp->lp;
 285         struct ds_data *dpkt = buf;
 286         struct ds_md_update_req *rp;
 287         struct {
 288                 struct ds_data          data;
 289                 struct ds_md_update_res res;
 290         } pkt;
 291
 292         rp = (struct ds_md_update_req *) (dpkt + 1);
 293
 294         printk(KERN_INFO "ds-%llu: Machine description update.\n", dp->id);
 295
 296         mdesc_update();
 297
 298         memset(&pkt, 0, sizeof(pkt));
 299         pkt.data.tag.type = DS_DATA;
 300         pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
 301         pkt.data.handle = cp->handle;
 302         pkt.res.req_num = rp->req_num;
 303         pkt.res.result = DS_OK;
 304
 305         ds_send(lp, &pkt, sizeof(pkt));
 306 }
 307
 308 struct ds_shutdown_req {
 309         __u64                           req_num;
 310         __u32                           ms_delay;
 311 };
 312
 313 struct ds_shutdown_res {
 314         __u64                           req_num;
 315         __u32                           result;
 316         char                            reason[1];
 317 };
 318
 319 static void domain_shutdown_data(struct ds_info *dp,
 320                                  struct ds_cap_state *cp,
 321                                  void *buf, int len)
 322 {
 323         struct ldc_channel *lp = dp->lp;
 324         struct ds_data *dpkt = buf;
 325         struct ds_shutdown_req *rp;
 326         struct {
 327                 struct ds_data          data;
 328                 struct ds_shutdown_res  res;
 329         } pkt;
 330
 331         rp = (struct ds_shutdown_req *) (dpkt + 1);
 332
 333         printk(KERN_ALERT "ds-%llu: Shutdown request from "
 334                "LDOM manager received.\n", dp->id);
 335
 336         memset(&pkt, 0, sizeof(pkt));
 337         pkt.data.tag.type = DS_DATA;
 338         pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
 339         pkt.data.handle = cp->handle;
 340         pkt.res.req_num = rp->req_num;
 341         pkt.res.result = DS_OK;
 342         pkt.res.reason[0] = 0;
 343
 344         ds_send(lp, &pkt, sizeof(pkt));
 345
 346         orderly_poweroff(true);
 347 }
 348
 349 struct ds_panic_req {
 350         __u64                           req_num;
 351 };
 352
 353 struct ds_panic_res {
 354         __u64                           req_num;
 355         __u32                           result;
 356         char                            reason[1];
 357 };
 358
 359 static void domain_panic_data(struct ds_info *dp,
 360                               struct ds_cap_state *cp,
 361                               void *buf, int len)
 362 {
 363         struct ldc_channel *lp = dp->lp;
 364         struct ds_data *dpkt = buf;
 365         struct ds_panic_req *rp;
 366         struct {
 367                 struct ds_data          data;
 368                 struct ds_panic_res     res;
 369         } pkt;
 370
 371         rp = (struct ds_panic_req *) (dpkt + 1);
 372
 373         printk(KERN_ALERT "ds-%llu: Panic request from "
 374                "LDOM manager received.\n", dp->id);
 375
 376         memset(&pkt, 0, sizeof(pkt));
 377         pkt.data.tag.type = DS_DATA;
 378         pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
 379         pkt.data.handle = cp->handle;
 380         pkt.res.req_num = rp->req_num;
 381         pkt.res.result = DS_OK;
 382         pkt.res.reason[0] = 0;
 383
 384         ds_send(lp, &pkt, sizeof(pkt));
 385
 386         panic("PANIC requested by LDOM manager.");
 387 }
 388
 389 #ifdef CONFIG_HOTPLUG_CPU
 390 struct dr_cpu_tag {
 391         __u64                           req_num;
 392         __u32                           type;
 393 #define DR_CPU_CONFIGURE                0x43
 394 #define DR_CPU_UNCONFIGURE              0x55
 395 #define DR_CPU_FORCE_UNCONFIGURE        0x46
 396 #define DR_CPU_STATUS                   0x53
 397
 398 /* Responses */
 399 #define DR_CPU_OK                       0x6f
 400 #define DR_CPU_ERROR                    0x65
 401
 402         __u32                           num_records;
 403 };
 404
 405 struct dr_cpu_resp_entry {
 406         __u32                           cpu;
 407         __u32                           result;
 408 #define DR_CPU_RES_OK                   0x00
 409 #define DR_CPU_RES_FAILURE              0x01
 410 #define DR_CPU_RES_BLOCKED              0x02
 411 #define DR_CPU_RES_CPU_NOT_RESPONDING   0x03
 412 #define DR_CPU_RES_NOT_IN_MD            0x04
 413
 414         __u32                           stat;
 415 #define DR_CPU_STAT_NOT_PRESENT         0x00
 416 #define DR_CPU_STAT_UNCONFIGURED        0x01
 417 #define DR_CPU_STAT_CONFIGURED          0x02
 418
 419         __u32                           str_off;
 420 };
 421
 422 static void __dr_cpu_send_error(struct ds_info *dp,
 423                                 struct ds_cap_state *cp,
 424                                 struct ds_data *data)
 425 {
 426         struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
 427         struct {
 428                 struct ds_data          data;
 429                 struct dr_cpu_tag       tag;
 430         } pkt;
 431         int msg_len;
 432
 433         memset(&pkt, 0, sizeof(pkt));
 434         pkt.data.tag.type = DS_DATA;
 435         pkt.data.handle = cp->handle;
 436         pkt.tag.req_num = tag->req_num;
 437         pkt.tag.type = DR_CPU_ERROR;
 438         pkt.tag.num_records = 0;
 439
 440         msg_len = (sizeof(struct ds_data) +
 441                    sizeof(struct dr_cpu_tag));
 442
 443         pkt.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
 444
 445         __ds_send(dp->lp, &pkt, msg_len);
 446 }
 447
 448 static void dr_cpu_send_error(struct ds_info *dp,
 449                               struct ds_cap_state *cp,
 450                               struct ds_data *data)
 451 {
 452         unsigned long flags;
 453
 454         spin_lock_irqsave(&ds_lock, flags);
 455         __dr_cpu_send_error(dp, cp, data);
 456         spin_unlock_irqrestore(&ds_lock, flags);
 457 }
 458
 459 #define CPU_SENTINEL    0xffffffff
 460
 461 static void purge_dups(u32 *list, u32 num_ents)
 462 {
 463         unsigned int i;
 464
 465         for (i = 0; i < num_ents; i++) {
 466                 u32 cpu = list[i];
 467                 unsigned int j;
 468
 469                 if (cpu == CPU_SENTINEL)
 470                         continue;
 471
 472                 for (j = i + 1; j < num_ents; j++) {
 473                         if (list[j] == cpu)
 474                                 list[j] = CPU_SENTINEL;
 475                 }
 476         }
 477 }
 478
 479 static int dr_cpu_size_response(int ncpus)
 480 {
 481         return (sizeof(struct ds_data) +
 482                 sizeof(struct dr_cpu_tag) +
 483                 (sizeof(struct dr_cpu_resp_entry) * ncpus));
 484 }
 485
 486 static void dr_cpu_init_response(struct ds_data *resp, u64 req_num,
 487                                  u64 handle, int resp_len, int ncpus,
 488                                  cpumask_t *mask, u32 default_stat)
 489 {
 490         struct dr_cpu_resp_entry *ent;
 491         struct dr_cpu_tag *tag;
 492         int i, cpu;
 493
 494         tag = (struct dr_cpu_tag *) (resp + 1);
 495         ent = (struct dr_cpu_resp_entry *) (tag + 1);
 496
 497         resp->tag.type = DS_DATA;
 498         resp->tag.len = resp_len - sizeof(struct ds_msg_tag);
 499         resp->handle = handle;
 500         tag->req_num = req_num;
 501         tag->type = DR_CPU_OK;
 502         tag->num_records = ncpus;
 503
 504         i = 0;
 505         for_each_cpu(cpu, mask) {
 506                 ent[i].cpu = cpu;
 507                 ent[i].result = DR_CPU_RES_OK;
 508                 ent[i].stat = default_stat;
 509                 i++;
 510         }
 511         BUG_ON(i != ncpus);
 512 }
 513
 514 static void dr_cpu_mark(struct ds_data *resp, int cpu, int ncpus,
 515                         u32 res, u32 stat)
 516 {
 517         struct dr_cpu_resp_entry *ent;
 518         struct dr_cpu_tag *tag;
 519         int i;
 520
 521         tag = (struct dr_cpu_tag *) (resp + 1);
 522         ent = (struct dr_cpu_resp_entry *) (tag + 1);
 523
 524         for (i = 0; i < ncpus; i++) {
 525                 if (ent[i].cpu != cpu)
 526                         continue;
 527                 ent[i].result = res;
 528                 ent[i].stat = stat;
 529                 break;
 530         }
 531 }
 532
 533 static int dr_cpu_configure(struct ds_info *dp, struct ds_cap_state *cp,
 534                             u64 req_num, cpumask_t *mask)
 535 {
 536         struct ds_data *resp;
 537         int resp_len, ncpus, cpu;
 538         unsigned long flags;
 539
 540         ncpus = cpumask_weight(mask);
 541         resp_len = dr_cpu_size_response(ncpus);
 542         resp = kzalloc(resp_len, GFP_KERNEL);
 543         if (!resp)
 544                 return -ENOMEM;
 545
 546         dr_cpu_init_response(resp, req_num, cp->handle,
 547                              resp_len, ncpus, mask,
 548                              DR_CPU_STAT_CONFIGURED);
 549
 550         mdesc_populate_present_mask(mask);
 551         mdesc_fill_in_cpu_data(mask);
 552
 553         for_each_cpu(cpu, mask) {
 554                 int err;
 555
 556                 printk(KERN_INFO "ds-%llu: Starting cpu %d...\n",
 557                        dp->id, cpu);
 558                 err = add_cpu(cpu);
 559                 if (err) {
 560                         __u32 res = DR_CPU_RES_FAILURE;
 561                         __u32 stat = DR_CPU_STAT_UNCONFIGURED;
 562
 563                         if (!cpu_present(cpu)) {
 564                                 /* CPU not present in MD */
 565                                 res = DR_CPU_RES_NOT_IN_MD;
 566                                 stat = DR_CPU_STAT_NOT_PRESENT;
 567                         } else if (err == -ENODEV) {
 568                                 /* CPU did not call in successfully */
 569                                 res = DR_CPU_RES_CPU_NOT_RESPONDING;
 570                         }
 571
 572                         printk(KERN_INFO "ds-%llu: CPU startup failed err=%d\n",
 573                                dp->id, err);
 574                         dr_cpu_mark(resp, cpu, ncpus, res, stat);
 575                 }
 576         }
 577
 578         spin_lock_irqsave(&ds_lock, flags);
 579         __ds_send(dp->lp, resp, resp_len);
 580         spin_unlock_irqrestore(&ds_lock, flags);
 581
 582         kfree(resp);
 583
 584         /* Redistribute IRQs, taking into account the new cpus.  */
 585         fixup_irqs();
 586
 587         return 0;
 588 }
 589
 590 static int dr_cpu_unconfigure(struct ds_info *dp,
 591                               struct ds_cap_state *cp,
 592                               u64 req_num,
 593                               cpumask_t *mask)
 594 {
 595         struct ds_data *resp;
 596         int resp_len, ncpus, cpu;
 597         unsigned long flags;
 598
 599         ncpus = cpumask_weight(mask);
 600         resp_len = dr_cpu_size_response(ncpus);
 601         resp = kzalloc(resp_len, GFP_KERNEL);
 602         if (!resp)
 603                 return -ENOMEM;
 604
 605         dr_cpu_init_response(resp, req_num, cp->handle,
 606                              resp_len, ncpus, mask,
 607                              DR_CPU_STAT_UNCONFIGURED);
 608
 609         for_each_cpu(cpu, mask) {
 610                 int err;
 611
 612                 printk(KERN_INFO "ds-%llu: Shutting down cpu %d...\n",
 613                        dp->id, cpu);
 614                 err = remove_cpu(cpu);
 615                 if (err)
 616                         dr_cpu_mark(resp, cpu, ncpus,
 617                                     DR_CPU_RES_FAILURE,
 618                                     DR_CPU_STAT_CONFIGURED);
 619         }
 620
 621         spin_lock_irqsave(&ds_lock, flags);
 622         __ds_send(dp->lp, resp, resp_len);
 623         spin_unlock_irqrestore(&ds_lock, flags);
 624
 625         kfree(resp);
 626
 627         return 0;
 628 }
 629
 630 static void dr_cpu_data(struct ds_info *dp, struct ds_cap_state *cp, void *buf,
 631                         int len)
 632 {
 633         struct ds_data *data = buf;
 634         struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
 635         u32 *cpu_list = (u32 *) (tag + 1);
 636         u64 req_num = tag->req_num;
 637         cpumask_t mask;
 638         unsigned int i;
 639         int err;
 640
 641         switch (tag->type) {
 642         case DR_CPU_CONFIGURE:
 643         case DR_CPU_UNCONFIGURE:
 644         case DR_CPU_FORCE_UNCONFIGURE:
 645                 break;
 646
 647         default:
 648                 dr_cpu_send_error(dp, cp, data);
 649                 return;
 650         }
 651
 652         purge_dups(cpu_list, tag->num_records);
 653
 654         cpumask_clear(&mask);
 655         for (i = 0; i < tag->num_records; i++) {
 656                 if (cpu_list[i] == CPU_SENTINEL)
 657                         continue;
 658
 659                 if (cpu_list[i] < nr_cpu_ids)
 660                         cpumask_set_cpu(cpu_list[i], &mask);
 661         }
 662
 663         if (tag->type == DR_CPU_CONFIGURE)
 664                 err = dr_cpu_configure(dp, cp, req_num, &mask);
 665         else
 666                 err = dr_cpu_unconfigure(dp, cp, req_num, &mask);
 667
 668         if (err)
 669                 dr_cpu_send_error(dp, cp, data);
 670 }
 671 #endif /* CONFIG_HOTPLUG_CPU */
 672
 673 struct ds_pri_msg {
 674         __u64                           req_num;
 675         __u64                           type;
 676 #define DS_PRI_REQUEST                  0x00
 677 #define DS_PRI_DATA                     0x01
 678 #define DS_PRI_UPDATE                   0x02
 679 };
 680
 681 static void ds_pri_data(struct ds_info *dp,
 682                         struct ds_cap_state *cp,
 683                         void *buf, int len)
 684 {
 685         struct ds_data *dpkt = buf;
 686         struct ds_pri_msg *rp;
 687
 688         rp = (struct ds_pri_msg *) (dpkt + 1);
 689
 690         printk(KERN_INFO "ds-%llu: PRI REQ [%llx:%llx], len=%d\n",
 691                dp->id, rp->req_num, rp->type, len);
 692 }
 693
 694 struct ds_var_hdr {
 695         __u32                           type;
 696 #define DS_VAR_SET_REQ                  0x00
 697 #define DS_VAR_DELETE_REQ               0x01
 698 #define DS_VAR_SET_RESP                 0x02
 699 #define DS_VAR_DELETE_RESP              0x03
 700 };
 701
 702 struct ds_var_set_msg {
 703         struct ds_var_hdr               hdr;
 704         char                            name_and_value[];
 705 };
 706
 707 struct ds_var_delete_msg {
 708         struct ds_var_hdr               hdr;
 709         char                            name[];
 710 };
 711
 712 struct ds_var_resp {
 713         struct ds_var_hdr               hdr;
 714         __u32                           result;
 715 #define DS_VAR_SUCCESS                  0x00
 716 #define DS_VAR_NO_SPACE                 0x01
 717 #define DS_VAR_INVALID_VAR              0x02
 718 #define DS_VAR_INVALID_VAL              0x03
 719 #define DS_VAR_NOT_PRESENT              0x04
 720 };
 721
 722 static DEFINE_MUTEX(ds_var_mutex);
 723 static int ds_var_doorbell;
 724 static int ds_var_response;
 725
 726 static void ds_var_data(struct ds_info *dp,
 727                         struct ds_cap_state *cp,
 728                         void *buf, int len)
 729 {
 730         struct ds_data *dpkt = buf;
 731         struct ds_var_resp *rp;
 732
 733         rp = (struct ds_var_resp *) (dpkt + 1);
 734
 735         if (rp->hdr.type != DS_VAR_SET_RESP &&
 736             rp->hdr.type != DS_VAR_DELETE_RESP)
 737                 return;
 738
 739         ds_var_response = rp->result;
 740         wmb();
 741         ds_var_doorbell = 1;
 742 }
 743
 744 void ldom_set_var(const char *var, const char *value)
 745 {
 746         struct ds_cap_state *cp;
 747         struct ds_info *dp;
 748         unsigned long flags;
 749
 750         spin_lock_irqsave(&ds_lock, flags);
 751         cp = NULL;
 752         for (dp = ds_info_list; dp; dp = dp->next) {
 753                 struct ds_cap_state *tmp;
 754
 755                 tmp = find_cap_by_string(dp, "var-config");
 756                 if (tmp && tmp->state == CAP_STATE_REGISTERED) {
 757                         cp = tmp;
 758                         break;
 759                 }
 760         }
 761         if (!cp) {
 762                 for (dp = ds_info_list; dp; dp = dp->next) {
 763                         struct ds_cap_state *tmp;
 764
 765                         tmp = find_cap_by_string(dp, "var-config-backup");
 766                         if (tmp && tmp->state == CAP_STATE_REGISTERED) {
 767                                 cp = tmp;
 768                                 break;
 769                         }
 770                 }
 771         }
 772         spin_unlock_irqrestore(&ds_lock, flags);
 773
 774         if (cp) {
 775                 union {
 776                         struct {
 777                                 struct ds_data          data;
 778                                 struct ds_var_set_msg   msg;
 779                         } header;
 780                         char                    all[512];
 781                 } pkt;
 782                 char  *base, *p;
 783                 int msg_len, loops;
 784
 785                 if (strlen(var) + strlen(value) + 2 >
 786                     sizeof(pkt) - sizeof(pkt.header)) {
 787                         printk(KERN_ERR PFX
 788                                 "contents length: %zu, which more than max: %lu,"
 789                                 "so could not set (%s) variable to (%s).\n",
 790                                 strlen(var) + strlen(value) + 2,
 791                                 sizeof(pkt) - sizeof(pkt.header), var, value);
 792                         return;
 793                 }
 794
 795                 memset(&pkt, 0, sizeof(pkt));
 796                 pkt.header.data.tag.type = DS_DATA;
 797                 pkt.header.data.handle = cp->handle;
 798                 pkt.header.msg.hdr.type = DS_VAR_SET_REQ;
 799                 base = p = &pkt.header.msg.name_and_value[0];
 800                 strcpy(p, var);
 801                 p += strlen(var) + 1;
 802                 strcpy(p, value);
 803                 p += strlen(value) + 1;
 804
 805                 msg_len = (sizeof(struct ds_data) +
 806                            sizeof(struct ds_var_set_msg) +
 807                            (p - base));
 808                 msg_len = (msg_len + 3) & ~3;
 809                 pkt.header.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
 810
 811                 mutex_lock(&ds_var_mutex);
 812
 813                 spin_lock_irqsave(&ds_lock, flags);
 814                 ds_var_doorbell = 0;
 815                 ds_var_response = -1;
 816
 817                 __ds_send(dp->lp, &pkt, msg_len);
 818                 spin_unlock_irqrestore(&ds_lock, flags);
 819
 820                 loops = 1000;
 821                 while (ds_var_doorbell == 0) {
 822                         if (loops-- < 0)
 823                                 break;
 824                         barrier();
 825                         udelay(100);
 826                 }
 827
 828                 mutex_unlock(&ds_var_mutex);
 829
 830                 if (ds_var_doorbell == 0 ||
 831                     ds_var_response != DS_VAR_SUCCESS)
 832                         printk(KERN_ERR "ds-%llu: var-config [%s:%s] "
 833                                "failed, response(%d).\n",
 834                                dp->id, var, value,
 835                                ds_var_response);
 836         } else {
 837                 printk(KERN_ERR PFX "var-config not registered so "
 838                        "could not set (%s) variable to (%s).\n",
 839                        var, value);
 840         }
 841 }
 842
 843 static char full_boot_str[256] __attribute__((aligned(32)));
 844 static int reboot_data_supported;
 845
 846 void ldom_reboot(const char *boot_command)
 847 {
 848         /* Don't bother with any of this if the boot_command
 849          * is empty.
 850          */
 851         if (boot_command && strlen(boot_command)) {
 852                 unsigned long len;
 853
 854                 snprintf(full_boot_str, sizeof(full_boot_str), "boot %s",
 855                          boot_command);
 856                 len = strlen(full_boot_str);
 857
 858                 if (reboot_data_supported) {
 859                         unsigned long ra = kimage_addr_to_ra(full_boot_str);
 860                         unsigned long hv_ret;
 861
 862                         hv_ret = sun4v_reboot_data_set(ra, len);
 863                         if (hv_ret != HV_EOK)
 864                                 pr_err("SUN4V: Unable to set reboot data "
 865                                        "hv_ret=%lu\n", hv_ret);
 866                 } else {
 867                         ldom_set_var("reboot-command", full_boot_str);
 868                 }
 869         }
 870         sun4v_mach_sir();
 871 }
 872
 873 void ldom_power_off(void)
 874 {
 875         sun4v_mach_exit(0);
 876 }
 877
 878 static void ds_conn_reset(struct ds_info *dp)
 879 {
 880         printk(KERN_ERR "ds-%llu: ds_conn_reset() from %ps\n",
 881                dp->id, __builtin_return_address(0));
 882 }
 883
 884 static int register_services(struct ds_info *dp)
 885 {
 886         struct ldc_channel *lp = dp->lp;
 887         int i;
 888
 889         for (i = 0; i < dp->num_ds_states; i++) {
 890                 struct {
 891                         struct ds_reg_req req;
 892                         u8 id_buf[256];
 893                 } pbuf;
 894                 struct ds_cap_state *cp = &dp->ds_states[i];
 895                 int err, msg_len;
 896                 u64 new_count;
 897
 898                 if (cp->state == CAP_STATE_REGISTERED)
 899                         continue;
 900
 901                 new_count = sched_clock() & 0xffffffff;
 902                 cp->handle = ((u64) i << 32) | new_count;
 903
 904                 msg_len = (sizeof(struct ds_reg_req) +
 905                            strlen(cp->service_id));
 906
 907                 memset(&pbuf, 0, sizeof(pbuf));
 908                 pbuf.req.tag.type = DS_REG_REQ;
 909                 pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag));
 910                 pbuf.req.handle = cp->handle;
 911                 pbuf.req.major = 1;
 912                 pbuf.req.minor = 0;
 913                 strcpy(pbuf.id_buf, cp->service_id);
 914
 915                 err = __ds_send(lp, &pbuf, msg_len);
 916                 if (err > 0)
 917                         cp->state = CAP_STATE_REG_SENT;
 918         }
 919         return 0;
 920 }
 921
 922 static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt)
 923 {
 924
 925         if (dp->hs_state == DS_HS_START) {
 926                 if (pkt->type != DS_INIT_ACK)
 927                         goto conn_reset;
 928
 929                 dp->hs_state = DS_HS_DONE;
 930
 931                 return register_services(dp);
 932         }
 933
 934         if (dp->hs_state != DS_HS_DONE)
 935                 goto conn_reset;
 936
 937         if (pkt->type == DS_REG_ACK) {
 938                 struct ds_reg_ack *ap = (struct ds_reg_ack *) pkt;
 939                 struct ds_cap_state *cp = find_cap(dp, ap->handle);
 940
 941                 if (!cp) {
 942                         printk(KERN_ERR "ds-%llu: REG ACK for unknown "
 943                                "handle %llx\n", dp->id, ap->handle);
 944                         return 0;
 945                 }
 946                 printk(KERN_INFO "ds-%llu: Registered %s service.\n",
 947                        dp->id, cp->service_id);
 948                 cp->state = CAP_STATE_REGISTERED;
 949         } else if (pkt->type == DS_REG_NACK) {
 950                 struct ds_reg_nack *np = (struct ds_reg_nack *) pkt;
 951                 struct ds_cap_state *cp = find_cap(dp, np->handle);
 952
 953                 if (!cp) {
 954                         printk(KERN_ERR "ds-%llu: REG NACK for "
 955                                "unknown handle %llx\n",
 956                                dp->id, np->handle);
 957                         return 0;
 958                 }
 959                 cp->state = CAP_STATE_UNKNOWN;
 960         }
 961
 962         return 0;
 963
 964 conn_reset:
 965         ds_conn_reset(dp);
 966         return -ECONNRESET;
 967 }
 968
 969 static void __send_ds_nack(struct ds_info *dp, u64 handle)
 970 {
 971         struct ds_data_nack nack = {
 972                 .tag = {
 973                         .type = DS_NACK,
 974                         .len = (sizeof(struct ds_data_nack) -
 975                                 sizeof(struct ds_msg_tag)),
 976                 },
 977                 .handle = handle,
 978                 .result = DS_INV_HDL,
 979         };
 980
 981         __ds_send(dp->lp, &nack, sizeof(nack));
 982 }
 983
 984 static LIST_HEAD(ds_work_list);
 985 static DECLARE_WAIT_QUEUE_HEAD(ds_wait);
 986
 987 struct ds_queue_entry {
 988         struct list_head                list;
 989         struct ds_info                  *dp;
 990         int                             req_len;
 991         int                             __pad;
 992         u64                             req[];
 993 };
 994
 995 static void process_ds_work(void)
 996 {
 997         struct ds_queue_entry *qp, *tmp;
 998         unsigned long flags;
 999         LIST_HEAD(todo);
1000
1001         spin_lock_irqsave(&ds_lock, flags);
1002         list_splice_init(&ds_work_list, &todo);
1003         spin_unlock_irqrestore(&ds_lock, flags);
1004
1005         list_for_each_entry_safe(qp, tmp, &todo, list) {
1006                 struct ds_data *dpkt = (struct ds_data *) qp->req;
1007                 struct ds_info *dp = qp->dp;
1008                 struct ds_cap_state *cp = find_cap(dp, dpkt->handle);
1009                 int req_len = qp->req_len;
1010
1011                 if (!cp) {
1012                         printk(KERN_ERR "ds-%llu: Data for unknown "
1013                                "handle %llu\n",
1014                                dp->id, dpkt->handle);
1015
1016                         spin_lock_irqsave(&ds_lock, flags);
1017                         __send_ds_nack(dp, dpkt->handle);
1018                         spin_unlock_irqrestore(&ds_lock, flags);
1019                 } else {
1020                         cp->data(dp, cp, dpkt, req_len);
1021                 }
1022
1023                 list_del(&qp->list);
1024                 kfree(qp);
1025         }
1026 }
1027
1028 static int ds_thread(void *__unused)
1029 {
1030         DEFINE_WAIT(wait);
1031
1032         while (1) {
1033                 prepare_to_wait(&ds_wait, &wait, TASK_INTERRUPTIBLE);
1034                 if (list_empty(&ds_work_list))
1035                         schedule();
1036                 finish_wait(&ds_wait, &wait);
1037
1038                 if (kthread_should_stop())
1039                         break;
1040
1041                 process_ds_work();
1042         }
1043
1044         return 0;
1045 }
1046
1047 static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len)
1048 {
1049         struct ds_data *dpkt = (struct ds_data *) pkt;
1050         struct ds_queue_entry *qp;
1051
1052         qp = kmalloc(sizeof(struct ds_queue_entry) + len, GFP_ATOMIC);
1053         if (!qp) {
1054                 __send_ds_nack(dp, dpkt->handle);
1055         } else {
1056                 qp->dp = dp;
1057                 memcpy(&qp->req, pkt, len);
1058                 list_add_tail(&qp->list, &ds_work_list);
1059                 wake_up(&ds_wait);
1060         }
1061         return 0;
1062 }
1063
1064 static void ds_up(struct ds_info *dp)
1065 {
1066         struct ldc_channel *lp = dp->lp;
1067         struct ds_ver_req req;
1068         int err;
1069
1070         req.tag.type = DS_INIT_REQ;
1071         req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag);
1072         req.ver.major = 1;
1073         req.ver.minor = 0;
1074
1075         err = __ds_send(lp, &req, sizeof(req));
1076         if (err > 0)
1077                 dp->hs_state = DS_HS_START;
1078 }
1079
1080 static void ds_reset(struct ds_info *dp)
1081 {
1082         int i;
1083
1084         dp->hs_state = 0;
1085
1086         for (i = 0; i < dp->num_ds_states; i++) {
1087                 struct ds_cap_state *cp = &dp->ds_states[i];
1088
1089                 cp->state = CAP_STATE_UNKNOWN;
1090         }
1091 }
1092
1093 static void ds_event(void *arg, int event)
1094 {
1095         struct ds_info *dp = arg;
1096         struct ldc_channel *lp = dp->lp;
1097         unsigned long flags;
1098         int err;
1099
1100         spin_lock_irqsave(&ds_lock, flags);
1101
1102         if (event == LDC_EVENT_UP) {
1103                 ds_up(dp);
1104                 spin_unlock_irqrestore(&ds_lock, flags);
1105                 return;
1106         }
1107
1108         if (event == LDC_EVENT_RESET) {
1109                 ds_reset(dp);
1110                 spin_unlock_irqrestore(&ds_lock, flags);
1111                 return;
1112         }
1113
1114         if (event != LDC_EVENT_DATA_READY) {
1115                 printk(KERN_WARNING "ds-%llu: Unexpected LDC event %d\n",
1116                        dp->id, event);
1117                 spin_unlock_irqrestore(&ds_lock, flags);
1118                 return;
1119         }
1120
1121         err = 0;
1122         while (1) {
1123                 struct ds_msg_tag *tag;
1124
1125                 err = ldc_read(lp, dp->rcv_buf, sizeof(*tag));
1126
1127                 if (unlikely(err < 0)) {
1128                         if (err == -ECONNRESET)
1129                                 ds_conn_reset(dp);
1130                         break;
1131                 }
1132                 if (err == 0)
1133                         break;
1134
1135                 tag = dp->rcv_buf;
1136                 err = ldc_read(lp, tag + 1, tag->len);
1137
1138                 if (unlikely(err < 0)) {
1139                         if (err == -ECONNRESET)
1140                                 ds_conn_reset(dp);
1141                         break;
1142                 }
1143                 if (err < tag->len)
1144                         break;
1145
1146                 if (tag->type < DS_DATA)
1147                         err = ds_handshake(dp, dp->rcv_buf);
1148                 else
1149                         err = ds_data(dp, dp->rcv_buf,
1150                                       sizeof(*tag) + err);
1151                 if (err == -ECONNRESET)
1152                         break;
1153         }
1154
1155         spin_unlock_irqrestore(&ds_lock, flags);
1156 }
1157
1158 static int ds_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1159 {
1160         static int ds_version_printed;
1161         struct ldc_channel_config ds_cfg = {
1162                 .event          = ds_event,
1163                 .mtu            = 4096,
1164                 .mode           = LDC_MODE_STREAM,
1165         };
1166         struct mdesc_handle *hp;
1167         struct ldc_channel *lp;
1168         struct ds_info *dp;
1169         const u64 *val;
1170         int err, i;
1171
1172         if (ds_version_printed++ == 0)
1173                 printk(KERN_INFO "%s", version);
1174
1175         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1176         err = -ENOMEM;
1177         if (!dp)
1178                 goto out_err;
1179
1180         hp = mdesc_grab();
1181         val = mdesc_get_property(hp, vdev->mp, "id", NULL);
1182         if (val)
1183                 dp->id = *val;
1184         mdesc_release(hp);
1185
1186         dp->rcv_buf = kzalloc(4096, GFP_KERNEL);
1187         if (!dp->rcv_buf)
1188                 goto out_free_dp;
1189
1190         dp->rcv_buf_len = 4096;
1191
1192         dp->ds_states = kmemdup(ds_states_template,
1193                                 sizeof(ds_states_template), GFP_KERNEL);
1194         if (!dp->ds_states)
1195                 goto out_free_rcv_buf;
1196
1197         dp->num_ds_states = ARRAY_SIZE(ds_states_template);
1198
1199         for (i = 0; i < dp->num_ds_states; i++)
1200                 dp->ds_states[i].handle = ((u64)i << 32);
1201
1202         ds_cfg.tx_irq = vdev->tx_irq;
1203         ds_cfg.rx_irq = vdev->rx_irq;
1204
1205         lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp, "DS");
1206         if (IS_ERR(lp)) {
1207                 err = PTR_ERR(lp);
1208                 goto out_free_ds_states;
1209         }
1210         dp->lp = lp;
1211
1212         err = ldc_bind(lp);
1213         if (err)
1214                 goto out_free_ldc;
1215
1216         spin_lock_irq(&ds_lock);
1217         dp->next = ds_info_list;
1218         ds_info_list = dp;
1219         spin_unlock_irq(&ds_lock);
1220
1221         return err;
1222
1223 out_free_ldc:
1224         ldc_free(dp->lp);
1225
1226 out_free_ds_states:
1227         kfree(dp->ds_states);
1228
1229 out_free_rcv_buf:
1230         kfree(dp->rcv_buf);
1231
1232 out_free_dp:
1233         kfree(dp);
1234
1235 out_err:
1236         return err;
1237 }
1238
1239 static int ds_remove(struct vio_dev *vdev)
1240 {
1241         return 0;
1242 }
1243
1244 static const struct vio_device_id ds_match[] = {
1245         {
1246                 .type = "domain-services-port",
1247         },
1248         {},
1249 };
1250
1251 static struct vio_driver ds_driver = {
1252         .id_table       = ds_match,
1253         .probe          = ds_probe,
1254         .remove         = ds_remove,
1255         .name           = "ds",
1256 };
1257
1258 static int __init ds_init(void)
1259 {
1260         unsigned long hv_ret, major, minor;
1261
1262         if (tlb_type == hypervisor) {
1263                 hv_ret = sun4v_get_version(HV_GRP_REBOOT_DATA, &major, &minor);
1264                 if (hv_ret == HV_EOK) {
1265                         pr_info("SUN4V: Reboot data supported (maj=%lu,min=%lu).\n",
1266                                 major, minor);
1267                         reboot_data_supported = 1;
1268                 }
1269         }
1270         kthread_run(ds_thread, NULL, "kldomd");
1271
1272         return vio_register_driver(&ds_driver);
1273 }
1274
1275 fs_initcall(ds_init);