drivers/misc/sgi-xp/xpc_uv.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (c) 2008-2009 Silicon Graphics, Inc.  All Rights Reserved.
   7  */
   8
   9 /*
  10  * Cross Partition Communication (XPC) uv-based functions.
  11  *
  12  *     Architecture specific implementation of common functions.
  13  *
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/mm.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/delay.h>
  20 #include <linux/device.h>
  21 #include <linux/err.h>
  22 #include <linux/slab.h>
  23 #include <asm/uv/uv_hub.h>
  24 #if defined CONFIG_X86_64
  25 #include <asm/uv/bios.h>
  26 #include <asm/uv/uv_irq.h>
  27 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
  28 #include <asm/sn/intr.h>
  29 #include <asm/sn/sn_sal.h>
  30 #endif
  31 #include "../sgi-gru/gru.h"
  32 #include "../sgi-gru/grukservices.h"
  33 #include "xpc.h"
  34
  35 #if defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
  36 struct uv_IO_APIC_route_entry {
  37         __u64   vector          :  8,
  38                 delivery_mode   :  3,
  39                 dest_mode       :  1,
  40                 delivery_status :  1,
  41                 polarity        :  1,
  42                 __reserved_1    :  1,
  43                 trigger         :  1,
  44                 mask            :  1,
  45                 __reserved_2    : 15,
  46                 dest            : 32;
  47 };
  48 #endif
  49
  50 static struct xpc_heartbeat_uv *xpc_heartbeat_uv;
  51
  52 #define XPC_ACTIVATE_MSG_SIZE_UV        (1 * GRU_CACHE_LINE_BYTES)
  53 #define XPC_ACTIVATE_MQ_SIZE_UV         (4 * XP_MAX_NPARTITIONS_UV * \
  54                                          XPC_ACTIVATE_MSG_SIZE_UV)
  55 #define XPC_ACTIVATE_IRQ_NAME           "xpc_activate"
  56
  57 #define XPC_NOTIFY_MSG_SIZE_UV          (2 * GRU_CACHE_LINE_BYTES)
  58 #define XPC_NOTIFY_MQ_SIZE_UV           (4 * XP_MAX_NPARTITIONS_UV * \
  59                                          XPC_NOTIFY_MSG_SIZE_UV)
  60 #define XPC_NOTIFY_IRQ_NAME             "xpc_notify"
  61
  62 static struct xpc_gru_mq_uv *xpc_activate_mq_uv;
  63 static struct xpc_gru_mq_uv *xpc_notify_mq_uv;
  64
  65 static int
  66 xpc_setup_partitions_uv(void)
  67 {
  68         short partid;
  69         struct xpc_partition_uv *part_uv;
  70
  71         for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
  72                 part_uv = &xpc_partitions[partid].sn.uv;
  73
  74                 mutex_init(&part_uv->cached_activate_gru_mq_desc_mutex);
  75                 spin_lock_init(&part_uv->flags_lock);
  76                 part_uv->remote_act_state = XPC_P_AS_INACTIVE;
  77         }
  78         return 0;
  79 }
  80
  81 static void
  82 xpc_teardown_partitions_uv(void)
  83 {
  84         short partid;
  85         struct xpc_partition_uv *part_uv;
  86         unsigned long irq_flags;
  87
  88         for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
  89                 part_uv = &xpc_partitions[partid].sn.uv;
  90
  91                 if (part_uv->cached_activate_gru_mq_desc != NULL) {
  92                         mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
  93                         spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
  94                         part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
  95                         spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
  96                         kfree(part_uv->cached_activate_gru_mq_desc);
  97                         part_uv->cached_activate_gru_mq_desc = NULL;
  98                         mutex_unlock(&part_uv->
  99                                      cached_activate_gru_mq_desc_mutex);
 100                 }
 101         }
 102 }
 103
 104 static int
 105 xpc_get_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq, int cpu, char *irq_name)
 106 {
 107         int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
 108
 109 #if defined CONFIG_X86_64
 110         mq->irq = uv_setup_irq(irq_name, cpu, mq->mmr_blade, mq->mmr_offset,
 111                         UV_AFFINITY_CPU);
 112         if (mq->irq < 0) {
 113                 dev_err(xpc_part, "uv_setup_irq() returned error=%d\n",
 114                         -mq->irq);
 115                 return mq->irq;
 116         }
 117
 118         mq->mmr_value = uv_read_global_mmr64(mmr_pnode, mq->mmr_offset);
 119
 120 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
 121         if (strcmp(irq_name, XPC_ACTIVATE_IRQ_NAME) == 0)
 122                 mq->irq = SGI_XPC_ACTIVATE;
 123         else if (strcmp(irq_name, XPC_NOTIFY_IRQ_NAME) == 0)
 124                 mq->irq = SGI_XPC_NOTIFY;
 125         else
 126                 return -EINVAL;
 127
 128         mq->mmr_value = (unsigned long)cpu_physical_id(cpu) << 32 | mq->irq;
 129         uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mq->mmr_value);
 130 #else
 131         #error not a supported configuration
 132 #endif
 133
 134         return 0;
 135 }
 136
 137 static void
 138 xpc_release_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq)
 139 {
 140 #if defined CONFIG_X86_64
 141         uv_teardown_irq(mq->irq);
 142
 143 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
 144         int mmr_pnode;
 145         unsigned long mmr_value;
 146
 147         mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
 148         mmr_value = 1UL << 16;
 149
 150         uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mmr_value);
 151 #else
 152         #error not a supported configuration
 153 #endif
 154 }
 155
 156 static int
 157 xpc_gru_mq_watchlist_alloc_uv(struct xpc_gru_mq_uv *mq)
 158 {
 159         int ret;
 160
 161 #if defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
 162         int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
 163
 164         ret = sn_mq_watchlist_alloc(mmr_pnode, (void *)uv_gpa(mq->address),
 165                                     mq->order, &mq->mmr_offset);
 166         if (ret < 0) {
 167                 dev_err(xpc_part, "sn_mq_watchlist_alloc() failed, ret=%d\n",
 168                         ret);
 169                 return -EBUSY;
 170         }
 171 #elif defined CONFIG_X86_64
 172         ret = uv_bios_mq_watchlist_alloc(uv_gpa(mq->address),
 173                                          mq->order, &mq->mmr_offset);
 174         if (ret < 0) {
 175                 dev_err(xpc_part, "uv_bios_mq_watchlist_alloc() failed, "
 176                         "ret=%d\n", ret);
 177                 return ret;
 178         }
 179 #else
 180         #error not a supported configuration
 181 #endif
 182
 183         mq->watchlist_num = ret;
 184         return 0;
 185 }
 186
 187 static void
 188 xpc_gru_mq_watchlist_free_uv(struct xpc_gru_mq_uv *mq)
 189 {
 190         int ret;
 191         int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
 192
 193 #if defined CONFIG_X86_64
 194         ret = uv_bios_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
 195         BUG_ON(ret != BIOS_STATUS_SUCCESS);
 196 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
 197         ret = sn_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
 198         BUG_ON(ret != SALRET_OK);
 199 #else
 200         #error not a supported configuration
 201 #endif
 202 }
 203
 204 static struct xpc_gru_mq_uv *
 205 xpc_create_gru_mq_uv(unsigned int mq_size, int cpu, char *irq_name,
 206                      irq_handler_t irq_handler)
 207 {
 208         enum xp_retval xp_ret;
 209         int ret;
 210         int nid;
 211         int nasid;
 212         int pg_order;
 213         struct page *page;
 214         struct xpc_gru_mq_uv *mq;
 215         struct uv_IO_APIC_route_entry *mmr_value;
 216
 217         mq = kmalloc(sizeof(struct xpc_gru_mq_uv), GFP_KERNEL);
 218         if (mq == NULL) {
 219                 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
 220                         "a xpc_gru_mq_uv structure\n");
 221                 ret = -ENOMEM;
 222                 goto out_0;
 223         }
 224
 225         mq->gru_mq_desc = kzalloc(sizeof(struct gru_message_queue_desc),
 226                                   GFP_KERNEL);
 227         if (mq->gru_mq_desc == NULL) {
 228                 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
 229                         "a gru_message_queue_desc structure\n");
 230                 ret = -ENOMEM;
 231                 goto out_1;
 232         }
 233
 234         pg_order = get_order(mq_size);
 235         mq->order = pg_order + PAGE_SHIFT;
 236         mq_size = 1UL << mq->order;
 237
 238         mq->mmr_blade = uv_cpu_to_blade_id(cpu);
 239
 240         nid = cpu_to_node(cpu);
 241         page = alloc_pages_exact_node(nid, GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
 242                                 pg_order);
 243         if (page == NULL) {
 244                 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to alloc %d "
 245                         "bytes of memory on nid=%d for GRU mq\n", mq_size, nid);
 246                 ret = -ENOMEM;
 247                 goto out_2;
 248         }
 249         mq->address = page_address(page);
 250
 251         /* enable generation of irq when GRU mq operation occurs to this mq */
 252         ret = xpc_gru_mq_watchlist_alloc_uv(mq);
 253         if (ret != 0)
 254                 goto out_3;
 255
 256         ret = xpc_get_gru_mq_irq_uv(mq, cpu, irq_name);
 257         if (ret != 0)
 258                 goto out_4;
 259
 260         ret = request_irq(mq->irq, irq_handler, 0, irq_name, NULL);
 261         if (ret != 0) {
 262                 dev_err(xpc_part, "request_irq(irq=%d) returned error=%d\n",
 263                         mq->irq, -ret);
 264                 goto out_5;
 265         }
 266
 267         nasid = UV_PNODE_TO_NASID(uv_cpu_to_pnode(cpu));
 268
 269         mmr_value = (struct uv_IO_APIC_route_entry *)&mq->mmr_value;
 270         ret = gru_create_message_queue(mq->gru_mq_desc, mq->address, mq_size,
 271                                      nasid, mmr_value->vector, mmr_value->dest);
 272         if (ret != 0) {
 273                 dev_err(xpc_part, "gru_create_message_queue() returned "
 274                         "error=%d\n", ret);
 275                 ret = -EINVAL;
 276                 goto out_6;
 277         }
 278
 279         /* allow other partitions to access this GRU mq */
 280         xp_ret = xp_expand_memprotect(xp_pa(mq->address), mq_size);
 281         if (xp_ret != xpSuccess) {
 282                 ret = -EACCES;
 283                 goto out_6;
 284         }
 285
 286         return mq;
 287
 288         /* something went wrong */
 289 out_6:
 290         free_irq(mq->irq, NULL);
 291 out_5:
 292         xpc_release_gru_mq_irq_uv(mq);
 293 out_4:
 294         xpc_gru_mq_watchlist_free_uv(mq);
 295 out_3:
 296         free_pages((unsigned long)mq->address, pg_order);
 297 out_2:
 298         kfree(mq->gru_mq_desc);
 299 out_1:
 300         kfree(mq);
 301 out_0:
 302         return ERR_PTR(ret);
 303 }
 304
 305 static void
 306 xpc_destroy_gru_mq_uv(struct xpc_gru_mq_uv *mq)
 307 {
 308         unsigned int mq_size;
 309         int pg_order;
 310         int ret;
 311
 312         /* disallow other partitions to access GRU mq */
 313         mq_size = 1UL << mq->order;
 314         ret = xp_restrict_memprotect(xp_pa(mq->address), mq_size);
 315         BUG_ON(ret != xpSuccess);
 316
 317         /* unregister irq handler and release mq irq/vector mapping */
 318         free_irq(mq->irq, NULL);
 319         xpc_release_gru_mq_irq_uv(mq);
 320
 321         /* disable generation of irq when GRU mq op occurs to this mq */
 322         xpc_gru_mq_watchlist_free_uv(mq);
 323
 324         pg_order = mq->order - PAGE_SHIFT;
 325         free_pages((unsigned long)mq->address, pg_order);
 326
 327         kfree(mq);
 328 }
 329
 330 static enum xp_retval
 331 xpc_send_gru_msg(struct gru_message_queue_desc *gru_mq_desc, void *msg,
 332                  size_t msg_size)
 333 {
 334         enum xp_retval xp_ret;
 335         int ret;
 336
 337         while (1) {
 338                 ret = gru_send_message_gpa(gru_mq_desc, msg, msg_size);
 339                 if (ret == MQE_OK) {
 340                         xp_ret = xpSuccess;
 341                         break;
 342                 }
 343
 344                 if (ret == MQE_QUEUE_FULL) {
 345                         dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
 346                                 "error=MQE_QUEUE_FULL\n");
 347                         /* !!! handle QLimit reached; delay & try again */
 348                         /* ??? Do we add a limit to the number of retries? */
 349                         (void)msleep_interruptible(10);
 350                 } else if (ret == MQE_CONGESTION) {
 351                         dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
 352                                 "error=MQE_CONGESTION\n");
 353                         /* !!! handle LB Overflow; simply try again */
 354                         /* ??? Do we add a limit to the number of retries? */
 355                 } else {
 356                         /* !!! Currently this is MQE_UNEXPECTED_CB_ERR */
 357                         dev_err(xpc_chan, "gru_send_message_gpa() returned "
 358                                 "error=%d\n", ret);
 359                         xp_ret = xpGruSendMqError;
 360                         break;
 361                 }
 362         }
 363         return xp_ret;
 364 }
 365
 366 static void
 367 xpc_process_activate_IRQ_rcvd_uv(void)
 368 {
 369         unsigned long irq_flags;
 370         short partid;
 371         struct xpc_partition *part;
 372         u8 act_state_req;
 373
 374         DBUG_ON(xpc_activate_IRQ_rcvd == 0);
 375
 376         spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 377         for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
 378                 part = &xpc_partitions[partid];
 379
 380                 if (part->sn.uv.act_state_req == 0)
 381                         continue;
 382
 383                 xpc_activate_IRQ_rcvd--;
 384                 BUG_ON(xpc_activate_IRQ_rcvd < 0);
 385
 386                 act_state_req = part->sn.uv.act_state_req;
 387                 part->sn.uv.act_state_req = 0;
 388                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 389
 390                 if (act_state_req == XPC_P_ASR_ACTIVATE_UV) {
 391                         if (part->act_state == XPC_P_AS_INACTIVE)
 392                                 xpc_activate_partition(part);
 393                         else if (part->act_state == XPC_P_AS_DEACTIVATING)
 394                                 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
 395
 396                 } else if (act_state_req == XPC_P_ASR_REACTIVATE_UV) {
 397                         if (part->act_state == XPC_P_AS_INACTIVE)
 398                                 xpc_activate_partition(part);
 399                         else
 400                                 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
 401
 402                 } else if (act_state_req == XPC_P_ASR_DEACTIVATE_UV) {
 403                         XPC_DEACTIVATE_PARTITION(part, part->sn.uv.reason);
 404
 405                 } else {
 406                         BUG();
 407                 }
 408
 409                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 410                 if (xpc_activate_IRQ_rcvd == 0)
 411                         break;
 412         }
 413         spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 414
 415 }
 416
 417 static void
 418 xpc_handle_activate_mq_msg_uv(struct xpc_partition *part,
 419                               struct xpc_activate_mq_msghdr_uv *msg_hdr,
 420                               int *wakeup_hb_checker)
 421 {
 422         unsigned long irq_flags;
 423         struct xpc_partition_uv *part_uv = &part->sn.uv;
 424         struct xpc_openclose_args *args;
 425
 426         part_uv->remote_act_state = msg_hdr->act_state;
 427
 428         switch (msg_hdr->type) {
 429         case XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV:
 430                 /* syncing of remote_act_state was just done above */
 431                 break;
 432
 433         case XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV: {
 434                 struct xpc_activate_mq_msg_activate_req_uv *msg;
 435
 436                 /*
 437                  * ??? Do we deal here with ts_jiffies being different
 438                  * ??? if act_state != XPC_P_AS_INACTIVE instead of
 439                  * ??? below?
 440                  */
 441                 msg = container_of(msg_hdr, struct
 442                                    xpc_activate_mq_msg_activate_req_uv, hdr);
 443
 444                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 445                 if (part_uv->act_state_req == 0)
 446                         xpc_activate_IRQ_rcvd++;
 447                 part_uv->act_state_req = XPC_P_ASR_ACTIVATE_UV;
 448                 part->remote_rp_pa = msg->rp_gpa; /* !!! _pa is _gpa */
 449                 part->remote_rp_ts_jiffies = msg_hdr->rp_ts_jiffies;
 450                 part_uv->heartbeat_gpa = msg->heartbeat_gpa;
 451
 452                 if (msg->activate_gru_mq_desc_gpa !=
 453                     part_uv->activate_gru_mq_desc_gpa) {
 454                         spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
 455                         part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
 456                         spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
 457                         part_uv->activate_gru_mq_desc_gpa =
 458                             msg->activate_gru_mq_desc_gpa;
 459                 }
 460                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 461
 462                 (*wakeup_hb_checker)++;
 463                 break;
 464         }
 465         case XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV: {
 466                 struct xpc_activate_mq_msg_deactivate_req_uv *msg;
 467
 468                 msg = container_of(msg_hdr, struct
 469                                    xpc_activate_mq_msg_deactivate_req_uv, hdr);
 470
 471                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 472                 if (part_uv->act_state_req == 0)
 473                         xpc_activate_IRQ_rcvd++;
 474                 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
 475                 part_uv->reason = msg->reason;
 476                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 477
 478                 (*wakeup_hb_checker)++;
 479                 return;
 480         }
 481         case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV: {
 482                 struct xpc_activate_mq_msg_chctl_closerequest_uv *msg;
 483
 484                 msg = container_of(msg_hdr, struct
 485                                    xpc_activate_mq_msg_chctl_closerequest_uv,
 486                                    hdr);
 487                 args = &part->remote_openclose_args[msg->ch_number];
 488                 args->reason = msg->reason;
 489
 490                 spin_lock_irqsave(&part->chctl_lock, irq_flags);
 491                 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREQUEST;
 492                 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
 493
 494                 xpc_wakeup_channel_mgr(part);
 495                 break;
 496         }
 497         case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV: {
 498                 struct xpc_activate_mq_msg_chctl_closereply_uv *msg;
 499
 500                 msg = container_of(msg_hdr, struct
 501                                    xpc_activate_mq_msg_chctl_closereply_uv,
 502                                    hdr);
 503
 504                 spin_lock_irqsave(&part->chctl_lock, irq_flags);
 505                 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREPLY;
 506                 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
 507
 508                 xpc_wakeup_channel_mgr(part);
 509                 break;
 510         }
 511         case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV: {
 512                 struct xpc_activate_mq_msg_chctl_openrequest_uv *msg;
 513
 514                 msg = container_of(msg_hdr, struct
 515                                    xpc_activate_mq_msg_chctl_openrequest_uv,
 516                                    hdr);
 517                 args = &part->remote_openclose_args[msg->ch_number];
 518                 args->entry_size = msg->entry_size;
 519                 args->local_nentries = msg->local_nentries;
 520
 521                 spin_lock_irqsave(&part->chctl_lock, irq_flags);
 522                 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREQUEST;
 523                 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
 524
 525                 xpc_wakeup_channel_mgr(part);
 526                 break;
 527         }
 528         case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV: {
 529                 struct xpc_activate_mq_msg_chctl_openreply_uv *msg;
 530
 531                 msg = container_of(msg_hdr, struct
 532                                    xpc_activate_mq_msg_chctl_openreply_uv, hdr);
 533                 args = &part->remote_openclose_args[msg->ch_number];
 534                 args->remote_nentries = msg->remote_nentries;
 535                 args->local_nentries = msg->local_nentries;
 536                 args->local_msgqueue_pa = msg->notify_gru_mq_desc_gpa;
 537
 538                 spin_lock_irqsave(&part->chctl_lock, irq_flags);
 539                 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREPLY;
 540                 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
 541
 542                 xpc_wakeup_channel_mgr(part);
 543                 break;
 544         }
 545         case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV: {
 546                 struct xpc_activate_mq_msg_chctl_opencomplete_uv *msg;
 547
 548                 msg = container_of(msg_hdr, struct
 549                                 xpc_activate_mq_msg_chctl_opencomplete_uv, hdr);
 550                 spin_lock_irqsave(&part->chctl_lock, irq_flags);
 551                 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENCOMPLETE;
 552                 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
 553
 554                 xpc_wakeup_channel_mgr(part);
 555         }
 556         case XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV:
 557                 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
 558                 part_uv->flags |= XPC_P_ENGAGED_UV;
 559                 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
 560                 break;
 561
 562         case XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV:
 563                 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
 564                 part_uv->flags &= ~XPC_P_ENGAGED_UV;
 565                 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
 566                 break;
 567
 568         default:
 569                 dev_err(xpc_part, "received unknown activate_mq msg type=%d "
 570                         "from partition=%d\n", msg_hdr->type, XPC_PARTID(part));
 571
 572                 /* get hb checker to deactivate from the remote partition */
 573                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 574                 if (part_uv->act_state_req == 0)
 575                         xpc_activate_IRQ_rcvd++;
 576                 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
 577                 part_uv->reason = xpBadMsgType;
 578                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 579
 580                 (*wakeup_hb_checker)++;
 581                 return;
 582         }
 583
 584         if (msg_hdr->rp_ts_jiffies != part->remote_rp_ts_jiffies &&
 585             part->remote_rp_ts_jiffies != 0) {
 586                 /*
 587                  * ??? Does what we do here need to be sensitive to
 588                  * ??? act_state or remote_act_state?
 589                  */
 590                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 591                 if (part_uv->act_state_req == 0)
 592                         xpc_activate_IRQ_rcvd++;
 593                 part_uv->act_state_req = XPC_P_ASR_REACTIVATE_UV;
 594                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 595
 596                 (*wakeup_hb_checker)++;
 597         }
 598 }
 599
 600 static irqreturn_t
 601 xpc_handle_activate_IRQ_uv(int irq, void *dev_id)
 602 {
 603         struct xpc_activate_mq_msghdr_uv *msg_hdr;
 604         short partid;
 605         struct xpc_partition *part;
 606         int wakeup_hb_checker = 0;
 607         int part_referenced;
 608
 609         while (1) {
 610                 msg_hdr = gru_get_next_message(xpc_activate_mq_uv->gru_mq_desc);
 611                 if (msg_hdr == NULL)
 612                         break;
 613
 614                 partid = msg_hdr->partid;
 615                 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
 616                         dev_err(xpc_part, "xpc_handle_activate_IRQ_uv() "
 617                                 "received invalid partid=0x%x in message\n",
 618                                 partid);
 619                 } else {
 620                         part = &xpc_partitions[partid];
 621
 622                         part_referenced = xpc_part_ref(part);
 623                         xpc_handle_activate_mq_msg_uv(part, msg_hdr,
 624                                                       &wakeup_hb_checker);
 625                         if (part_referenced)
 626                                 xpc_part_deref(part);
 627                 }
 628
 629                 gru_free_message(xpc_activate_mq_uv->gru_mq_desc, msg_hdr);
 630         }
 631
 632         if (wakeup_hb_checker)
 633                 wake_up_interruptible(&xpc_activate_IRQ_wq);
 634
 635         return IRQ_HANDLED;
 636 }
 637
 638 static enum xp_retval
 639 xpc_cache_remote_gru_mq_desc_uv(struct gru_message_queue_desc *gru_mq_desc,
 640                                 unsigned long gru_mq_desc_gpa)
 641 {
 642         enum xp_retval ret;
 643
 644         ret = xp_remote_memcpy(uv_gpa(gru_mq_desc), gru_mq_desc_gpa,
 645                                sizeof(struct gru_message_queue_desc));
 646         if (ret == xpSuccess)
 647                 gru_mq_desc->mq = NULL;
 648
 649         return ret;
 650 }
 651
 652 static enum xp_retval
 653 xpc_send_activate_IRQ_uv(struct xpc_partition *part, void *msg, size_t msg_size,
 654                          int msg_type)
 655 {
 656         struct xpc_activate_mq_msghdr_uv *msg_hdr = msg;
 657         struct xpc_partition_uv *part_uv = &part->sn.uv;
 658         struct gru_message_queue_desc *gru_mq_desc;
 659         unsigned long irq_flags;
 660         enum xp_retval ret;
 661
 662         DBUG_ON(msg_size > XPC_ACTIVATE_MSG_SIZE_UV);
 663
 664         msg_hdr->type = msg_type;
 665         msg_hdr->partid = xp_partition_id;
 666         msg_hdr->act_state = part->act_state;
 667         msg_hdr->rp_ts_jiffies = xpc_rsvd_page->ts_jiffies;
 668
 669         mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
 670 again:
 671         if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV)) {
 672                 gru_mq_desc = part_uv->cached_activate_gru_mq_desc;
 673                 if (gru_mq_desc == NULL) {
 674                         gru_mq_desc = kmalloc(sizeof(struct
 675                                               gru_message_queue_desc),
 676                                               GFP_KERNEL);
 677                         if (gru_mq_desc == NULL) {
 678                                 ret = xpNoMemory;
 679                                 goto done;
 680                         }
 681                         part_uv->cached_activate_gru_mq_desc = gru_mq_desc;
 682                 }
 683
 684                 ret = xpc_cache_remote_gru_mq_desc_uv(gru_mq_desc,
 685                                                       part_uv->
 686                                                       activate_gru_mq_desc_gpa);
 687                 if (ret != xpSuccess)
 688                         goto done;
 689
 690                 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
 691                 part_uv->flags |= XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
 692                 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
 693         }
 694
 695         /* ??? Is holding a spin_lock (ch->lock) during this call a bad idea? */
 696         ret = xpc_send_gru_msg(part_uv->cached_activate_gru_mq_desc, msg,
 697                                msg_size);
 698         if (ret != xpSuccess) {
 699                 smp_rmb();      /* ensure a fresh copy of part_uv->flags */
 700                 if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV))
 701                         goto again;
 702         }
 703 done:
 704         mutex_unlock(&part_uv->cached_activate_gru_mq_desc_mutex);
 705         return ret;
 706 }
 707
 708 static void
 709 xpc_send_activate_IRQ_part_uv(struct xpc_partition *part, void *msg,
 710                               size_t msg_size, int msg_type)
 711 {
 712         enum xp_retval ret;
 713
 714         ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
 715         if (unlikely(ret != xpSuccess))
 716                 XPC_DEACTIVATE_PARTITION(part, ret);
 717 }
 718
 719 static void
 720 xpc_send_activate_IRQ_ch_uv(struct xpc_channel *ch, unsigned long *irq_flags,
 721                          void *msg, size_t msg_size, int msg_type)
 722 {
 723         struct xpc_partition *part = &xpc_partitions[ch->partid];
 724         enum xp_retval ret;
 725
 726         ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
 727         if (unlikely(ret != xpSuccess)) {
 728                 if (irq_flags != NULL)
 729                         spin_unlock_irqrestore(&ch->lock, *irq_flags);
 730
 731                 XPC_DEACTIVATE_PARTITION(part, ret);
 732
 733                 if (irq_flags != NULL)
 734                         spin_lock_irqsave(&ch->lock, *irq_flags);
 735         }
 736 }
 737
 738 static void
 739 xpc_send_local_activate_IRQ_uv(struct xpc_partition *part, int act_state_req)
 740 {
 741         unsigned long irq_flags;
 742         struct xpc_partition_uv *part_uv = &part->sn.uv;
 743
 744         /*
 745          * !!! Make our side think that the remote partition sent an activate
 746          * !!! mq message our way by doing what the activate IRQ handler would
 747          * !!! do had one really been sent.
 748          */
 749
 750         spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 751         if (part_uv->act_state_req == 0)
 752                 xpc_activate_IRQ_rcvd++;
 753         part_uv->act_state_req = act_state_req;
 754         spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 755
 756         wake_up_interruptible(&xpc_activate_IRQ_wq);
 757 }
 758
 759 static enum xp_retval
 760 xpc_get_partition_rsvd_page_pa_uv(void *buf, u64 *cookie, unsigned long *rp_pa,
 761                                   size_t *len)
 762 {
 763         s64 status;
 764         enum xp_retval ret;
 765
 766 #if defined CONFIG_X86_64
 767         status = uv_bios_reserved_page_pa((u64)buf, cookie, (u64 *)rp_pa,
 768                                           (u64 *)len);
 769         if (status == BIOS_STATUS_SUCCESS)
 770                 ret = xpSuccess;
 771         else if (status == BIOS_STATUS_MORE_PASSES)
 772                 ret = xpNeedMoreInfo;
 773         else
 774                 ret = xpBiosError;
 775
 776 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
 777         status = sn_partition_reserved_page_pa((u64)buf, cookie, rp_pa, len);
 778         if (status == SALRET_OK)
 779                 ret = xpSuccess;
 780         else if (status == SALRET_MORE_PASSES)
 781                 ret = xpNeedMoreInfo;
 782         else
 783                 ret = xpSalError;
 784
 785 #else
 786         #error not a supported configuration
 787 #endif
 788
 789         return ret;
 790 }
 791
 792 static int
 793 xpc_setup_rsvd_page_uv(struct xpc_rsvd_page *rp)
 794 {
 795         xpc_heartbeat_uv =
 796             &xpc_partitions[sn_partition_id].sn.uv.cached_heartbeat;
 797         rp->sn.uv.heartbeat_gpa = uv_gpa(xpc_heartbeat_uv);
 798         rp->sn.uv.activate_gru_mq_desc_gpa =
 799             uv_gpa(xpc_activate_mq_uv->gru_mq_desc);
 800         return 0;
 801 }
 802
 803 static void
 804 xpc_allow_hb_uv(short partid)
 805 {
 806 }
 807
 808 static void
 809 xpc_disallow_hb_uv(short partid)
 810 {
 811 }
 812
 813 static void
 814 xpc_disallow_all_hbs_uv(void)
 815 {
 816 }
 817
 818 static void
 819 xpc_increment_heartbeat_uv(void)
 820 {
 821         xpc_heartbeat_uv->value++;
 822 }
 823
 824 static void
 825 xpc_offline_heartbeat_uv(void)
 826 {
 827         xpc_increment_heartbeat_uv();
 828         xpc_heartbeat_uv->offline = 1;
 829 }
 830
 831 static void
 832 xpc_online_heartbeat_uv(void)
 833 {
 834         xpc_increment_heartbeat_uv();
 835         xpc_heartbeat_uv->offline = 0;
 836 }
 837
 838 static void
 839 xpc_heartbeat_init_uv(void)
 840 {
 841         xpc_heartbeat_uv->value = 1;
 842         xpc_heartbeat_uv->offline = 0;
 843 }
 844
 845 static void
 846 xpc_heartbeat_exit_uv(void)
 847 {
 848         xpc_offline_heartbeat_uv();
 849 }
 850
 851 static enum xp_retval
 852 xpc_get_remote_heartbeat_uv(struct xpc_partition *part)
 853 {
 854         struct xpc_partition_uv *part_uv = &part->sn.uv;
 855         enum xp_retval ret;
 856
 857         ret = xp_remote_memcpy(uv_gpa(&part_uv->cached_heartbeat),
 858                                part_uv->heartbeat_gpa,
 859                                sizeof(struct xpc_heartbeat_uv));
 860         if (ret != xpSuccess)
 861                 return ret;
 862
 863         if (part_uv->cached_heartbeat.value == part->last_heartbeat &&
 864             !part_uv->cached_heartbeat.offline) {
 865
 866                 ret = xpNoHeartbeat;
 867         } else {
 868                 part->last_heartbeat = part_uv->cached_heartbeat.value;
 869         }
 870         return ret;
 871 }
 872
 873 static void
 874 xpc_request_partition_activation_uv(struct xpc_rsvd_page *remote_rp,
 875                                     unsigned long remote_rp_gpa, int nasid)
 876 {
 877         short partid = remote_rp->SAL_partid;
 878         struct xpc_partition *part = &xpc_partitions[partid];
 879         struct xpc_activate_mq_msg_activate_req_uv msg;
 880
 881         part->remote_rp_pa = remote_rp_gpa; /* !!! _pa here is really _gpa */
 882         part->remote_rp_ts_jiffies = remote_rp->ts_jiffies;
 883         part->sn.uv.heartbeat_gpa = remote_rp->sn.uv.heartbeat_gpa;
 884         part->sn.uv.activate_gru_mq_desc_gpa =
 885             remote_rp->sn.uv.activate_gru_mq_desc_gpa;
 886
 887         /*
 888          * ??? Is it a good idea to make this conditional on what is
 889          * ??? potentially stale state information?
 890          */
 891         if (part->sn.uv.remote_act_state == XPC_P_AS_INACTIVE) {
 892                 msg.rp_gpa = uv_gpa(xpc_rsvd_page);
 893                 msg.heartbeat_gpa = xpc_rsvd_page->sn.uv.heartbeat_gpa;
 894                 msg.activate_gru_mq_desc_gpa =
 895                     xpc_rsvd_page->sn.uv.activate_gru_mq_desc_gpa;
 896                 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
 897                                            XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV);
 898         }
 899
 900         if (part->act_state == XPC_P_AS_INACTIVE)
 901                 xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
 902 }
 903
 904 static void
 905 xpc_request_partition_reactivation_uv(struct xpc_partition *part)
 906 {
 907         xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
 908 }
 909
 910 static void
 911 xpc_request_partition_deactivation_uv(struct xpc_partition *part)
 912 {
 913         struct xpc_activate_mq_msg_deactivate_req_uv msg;
 914
 915         /*
 916          * ??? Is it a good idea to make this conditional on what is
 917          * ??? potentially stale state information?
 918          */
 919         if (part->sn.uv.remote_act_state != XPC_P_AS_DEACTIVATING &&
 920             part->sn.uv.remote_act_state != XPC_P_AS_INACTIVE) {
 921
 922                 msg.reason = part->reason;
 923                 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
 924                                          XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV);
 925         }
 926 }
 927
 928 static void
 929 xpc_cancel_partition_deactivation_request_uv(struct xpc_partition *part)
 930 {
 931         /* nothing needs to be done */
 932         return;
 933 }
 934
 935 static void
 936 xpc_init_fifo_uv(struct xpc_fifo_head_uv *head)
 937 {
 938         head->first = NULL;
 939         head->last = NULL;
 940         spin_lock_init(&head->lock);
 941         head->n_entries = 0;
 942 }
 943
 944 static void *
 945 xpc_get_fifo_entry_uv(struct xpc_fifo_head_uv *head)
 946 {
 947         unsigned long irq_flags;
 948         struct xpc_fifo_entry_uv *first;
 949
 950         spin_lock_irqsave(&head->lock, irq_flags);
 951         first = head->first;
 952         if (head->first != NULL) {
 953                 head->first = first->next;
 954                 if (head->first == NULL)
 955                         head->last = NULL;
 956
 957                 head->n_entries--;
 958                 BUG_ON(head->n_entries < 0);
 959
 960                 first->next = NULL;
 961         }
 962         spin_unlock_irqrestore(&head->lock, irq_flags);
 963         return first;
 964 }
 965
 966 static void
 967 xpc_put_fifo_entry_uv(struct xpc_fifo_head_uv *head,
 968                       struct xpc_fifo_entry_uv *last)
 969 {
 970         unsigned long irq_flags;
 971
 972         last->next = NULL;
 973         spin_lock_irqsave(&head->lock, irq_flags);
 974         if (head->last != NULL)
 975                 head->last->next = last;
 976         else
 977                 head->first = last;
 978         head->last = last;
 979         head->n_entries++;
 980         spin_unlock_irqrestore(&head->lock, irq_flags);
 981 }
 982
 983 static int
 984 xpc_n_of_fifo_entries_uv(struct xpc_fifo_head_uv *head)
 985 {
 986         return head->n_entries;
 987 }
 988
 989 /*
 990  * Setup the channel structures that are uv specific.
 991  */
 992 static enum xp_retval
 993 xpc_setup_ch_structures_uv(struct xpc_partition *part)
 994 {
 995         struct xpc_channel_uv *ch_uv;
 996         int ch_number;
 997
 998         for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
 999                 ch_uv = &part->channels[ch_number].sn.uv;
1000
1001                 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1002                 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
1003         }
1004
1005         return xpSuccess;
1006 }
1007
1008 /*
1009  * Teardown the channel structures that are uv specific.
1010  */
1011 static void
1012 xpc_teardown_ch_structures_uv(struct xpc_partition *part)
1013 {
1014         /* nothing needs to be done */
1015         return;
1016 }
1017
1018 static enum xp_retval
1019 xpc_make_first_contact_uv(struct xpc_partition *part)
1020 {
1021         struct xpc_activate_mq_msg_uv msg;
1022
1023         /*
1024          * We send a sync msg to get the remote partition's remote_act_state
1025          * updated to our current act_state which at this point should
1026          * be XPC_P_AS_ACTIVATING.
1027          */
1028         xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1029                                       XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV);
1030
1031         while (!((part->sn.uv.remote_act_state == XPC_P_AS_ACTIVATING) ||
1032                  (part->sn.uv.remote_act_state == XPC_P_AS_ACTIVE))) {
1033
1034                 dev_dbg(xpc_part, "waiting to make first contact with "
1035                         "partition %d\n", XPC_PARTID(part));
1036
1037                 /* wait a 1/4 of a second or so */
1038                 (void)msleep_interruptible(250);
1039
1040                 if (part->act_state == XPC_P_AS_DEACTIVATING)
1041                         return part->reason;
1042         }
1043
1044         return xpSuccess;
1045 }
1046
1047 static u64
1048 xpc_get_chctl_all_flags_uv(struct xpc_partition *part)
1049 {
1050         unsigned long irq_flags;
1051         union xpc_channel_ctl_flags chctl;
1052
1053         spin_lock_irqsave(&part->chctl_lock, irq_flags);
1054         chctl = part->chctl;
1055         if (chctl.all_flags != 0)
1056                 part->chctl.all_flags = 0;
1057
1058         spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1059         return chctl.all_flags;
1060 }
1061
1062 static enum xp_retval
1063 xpc_allocate_send_msg_slot_uv(struct xpc_channel *ch)
1064 {
1065         struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1066         struct xpc_send_msg_slot_uv *msg_slot;
1067         unsigned long irq_flags;
1068         int nentries;
1069         int entry;
1070         size_t nbytes;
1071
1072         for (nentries = ch->local_nentries; nentries > 0; nentries--) {
1073                 nbytes = nentries * sizeof(struct xpc_send_msg_slot_uv);
1074                 ch_uv->send_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1075                 if (ch_uv->send_msg_slots == NULL)
1076                         continue;
1077
1078                 for (entry = 0; entry < nentries; entry++) {
1079                         msg_slot = &ch_uv->send_msg_slots[entry];
1080
1081                         msg_slot->msg_slot_number = entry;
1082                         xpc_put_fifo_entry_uv(&ch_uv->msg_slot_free_list,
1083                                               &msg_slot->next);
1084                 }
1085
1086                 spin_lock_irqsave(&ch->lock, irq_flags);
1087                 if (nentries < ch->local_nentries)
1088                         ch->local_nentries = nentries;
1089                 spin_unlock_irqrestore(&ch->lock, irq_flags);
1090                 return xpSuccess;
1091         }
1092
1093         return xpNoMemory;
1094 }
1095
1096 static enum xp_retval
1097 xpc_allocate_recv_msg_slot_uv(struct xpc_channel *ch)
1098 {
1099         struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1100         struct xpc_notify_mq_msg_uv *msg_slot;
1101         unsigned long irq_flags;
1102         int nentries;
1103         int entry;
1104         size_t nbytes;
1105
1106         for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
1107                 nbytes = nentries * ch->entry_size;
1108                 ch_uv->recv_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1109                 if (ch_uv->recv_msg_slots == NULL)
1110                         continue;
1111
1112                 for (entry = 0; entry < nentries; entry++) {
1113                         msg_slot = ch_uv->recv_msg_slots +
1114                             entry * ch->entry_size;
1115
1116                         msg_slot->hdr.msg_slot_number = entry;
1117                 }
1118
1119                 spin_lock_irqsave(&ch->lock, irq_flags);
1120                 if (nentries < ch->remote_nentries)
1121                         ch->remote_nentries = nentries;
1122                 spin_unlock_irqrestore(&ch->lock, irq_flags);
1123                 return xpSuccess;
1124         }
1125
1126         return xpNoMemory;
1127 }
1128
1129 /*
1130  * Allocate msg_slots associated with the channel.
1131  */
1132 static enum xp_retval
1133 xpc_setup_msg_structures_uv(struct xpc_channel *ch)
1134 {
1135         static enum xp_retval ret;
1136         struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1137
1138         DBUG_ON(ch->flags & XPC_C_SETUP);
1139
1140         ch_uv->cached_notify_gru_mq_desc = kmalloc(sizeof(struct
1141                                                    gru_message_queue_desc),
1142                                                    GFP_KERNEL);
1143         if (ch_uv->cached_notify_gru_mq_desc == NULL)
1144                 return xpNoMemory;
1145
1146         ret = xpc_allocate_send_msg_slot_uv(ch);
1147         if (ret == xpSuccess) {
1148
1149                 ret = xpc_allocate_recv_msg_slot_uv(ch);
1150                 if (ret != xpSuccess) {
1151                         kfree(ch_uv->send_msg_slots);
1152                         xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1153                 }
1154         }
1155         return ret;
1156 }
1157
1158 /*
1159  * Free up msg_slots and clear other stuff that were setup for the specified
1160  * channel.
1161  */
1162 static void
1163 xpc_teardown_msg_structures_uv(struct xpc_channel *ch)
1164 {
1165         struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1166
1167         DBUG_ON(!spin_is_locked(&ch->lock));
1168
1169         kfree(ch_uv->cached_notify_gru_mq_desc);
1170         ch_uv->cached_notify_gru_mq_desc = NULL;
1171
1172         if (ch->flags & XPC_C_SETUP) {
1173                 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1174                 kfree(ch_uv->send_msg_slots);
1175                 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
1176                 kfree(ch_uv->recv_msg_slots);
1177         }
1178 }
1179
1180 static void
1181 xpc_send_chctl_closerequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1182 {
1183         struct xpc_activate_mq_msg_chctl_closerequest_uv msg;
1184
1185         msg.ch_number = ch->number;
1186         msg.reason = ch->reason;
1187         xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1188                                     XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV);
1189 }
1190
1191 static void
1192 xpc_send_chctl_closereply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1193 {
1194         struct xpc_activate_mq_msg_chctl_closereply_uv msg;
1195
1196         msg.ch_number = ch->number;
1197         xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1198                                     XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV);
1199 }
1200
1201 static void
1202 xpc_send_chctl_openrequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1203 {
1204         struct xpc_activate_mq_msg_chctl_openrequest_uv msg;
1205
1206         msg.ch_number = ch->number;
1207         msg.entry_size = ch->entry_size;
1208         msg.local_nentries = ch->local_nentries;
1209         xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1210                                     XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV);
1211 }
1212
1213 static void
1214 xpc_send_chctl_openreply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1215 {
1216         struct xpc_activate_mq_msg_chctl_openreply_uv msg;
1217
1218         msg.ch_number = ch->number;
1219         msg.local_nentries = ch->local_nentries;
1220         msg.remote_nentries = ch->remote_nentries;
1221         msg.notify_gru_mq_desc_gpa = uv_gpa(xpc_notify_mq_uv->gru_mq_desc);
1222         xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1223                                     XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV);
1224 }
1225
1226 static void
1227 xpc_send_chctl_opencomplete_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1228 {
1229         struct xpc_activate_mq_msg_chctl_opencomplete_uv msg;
1230
1231         msg.ch_number = ch->number;
1232         xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1233                                     XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV);
1234 }
1235
1236 static void
1237 xpc_send_chctl_local_msgrequest_uv(struct xpc_partition *part, int ch_number)
1238 {
1239         unsigned long irq_flags;
1240
1241         spin_lock_irqsave(&part->chctl_lock, irq_flags);
1242         part->chctl.flags[ch_number] |= XPC_CHCTL_MSGREQUEST;
1243         spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1244
1245         xpc_wakeup_channel_mgr(part);
1246 }
1247
1248 static enum xp_retval
1249 xpc_save_remote_msgqueue_pa_uv(struct xpc_channel *ch,
1250                                unsigned long gru_mq_desc_gpa)
1251 {
1252         struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1253
1254         DBUG_ON(ch_uv->cached_notify_gru_mq_desc == NULL);
1255         return xpc_cache_remote_gru_mq_desc_uv(ch_uv->cached_notify_gru_mq_desc,
1256                                                gru_mq_desc_gpa);
1257 }
1258
1259 static void
1260 xpc_indicate_partition_engaged_uv(struct xpc_partition *part)
1261 {
1262         struct xpc_activate_mq_msg_uv msg;
1263
1264         xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1265                                       XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV);
1266 }
1267
1268 static void
1269 xpc_indicate_partition_disengaged_uv(struct xpc_partition *part)
1270 {
1271         struct xpc_activate_mq_msg_uv msg;
1272
1273         xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1274                                       XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV);
1275 }
1276
1277 static void
1278 xpc_assume_partition_disengaged_uv(short partid)
1279 {
1280         struct xpc_partition_uv *part_uv = &xpc_partitions[partid].sn.uv;
1281         unsigned long irq_flags;
1282
1283         spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
1284         part_uv->flags &= ~XPC_P_ENGAGED_UV;
1285         spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
1286 }
1287
1288 static int
1289 xpc_partition_engaged_uv(short partid)
1290 {
1291         return (xpc_partitions[partid].sn.uv.flags & XPC_P_ENGAGED_UV) != 0;
1292 }
1293
1294 static int
1295 xpc_any_partition_engaged_uv(void)
1296 {
1297         struct xpc_partition_uv *part_uv;
1298         short partid;
1299
1300         for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
1301                 part_uv = &xpc_partitions[partid].sn.uv;
1302                 if ((part_uv->flags & XPC_P_ENGAGED_UV) != 0)
1303                         return 1;
1304         }
1305         return 0;
1306 }
1307
1308 static enum xp_retval
1309 xpc_allocate_msg_slot_uv(struct xpc_channel *ch, u32 flags,
1310                          struct xpc_send_msg_slot_uv **address_of_msg_slot)
1311 {
1312         enum xp_retval ret;
1313         struct xpc_send_msg_slot_uv *msg_slot;
1314         struct xpc_fifo_entry_uv *entry;
1315
1316         while (1) {
1317                 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list);
1318                 if (entry != NULL)
1319                         break;
1320
1321                 if (flags & XPC_NOWAIT)
1322                         return xpNoWait;
1323
1324                 ret = xpc_allocate_msg_wait(ch);
1325                 if (ret != xpInterrupted && ret != xpTimeout)
1326                         return ret;
1327         }
1328
1329         msg_slot = container_of(entry, struct xpc_send_msg_slot_uv, next);
1330         *address_of_msg_slot = msg_slot;
1331         return xpSuccess;
1332 }
1333
1334 static void
1335 xpc_free_msg_slot_uv(struct xpc_channel *ch,
1336                      struct xpc_send_msg_slot_uv *msg_slot)
1337 {
1338         xpc_put_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list, &msg_slot->next);
1339
1340         /* wakeup anyone waiting for a free msg slot */
1341         if (atomic_read(&ch->n_on_msg_allocate_wq) > 0)
1342                 wake_up(&ch->msg_allocate_wq);
1343 }
1344
1345 static void
1346 xpc_notify_sender_uv(struct xpc_channel *ch,
1347                      struct xpc_send_msg_slot_uv *msg_slot,
1348                      enum xp_retval reason)
1349 {
1350         xpc_notify_func func = msg_slot->func;
1351
1352         if (func != NULL && cmpxchg(&msg_slot->func, func, NULL) == func) {
1353
1354                 atomic_dec(&ch->n_to_notify);
1355
1356                 dev_dbg(xpc_chan, "msg_slot->func() called, msg_slot=0x%p "
1357                         "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1358                         msg_slot->msg_slot_number, ch->partid, ch->number);
1359
1360                 func(reason, ch->partid, ch->number, msg_slot->key);
1361
1362                 dev_dbg(xpc_chan, "msg_slot->func() returned, msg_slot=0x%p "
1363                         "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1364                         msg_slot->msg_slot_number, ch->partid, ch->number);
1365         }
1366 }
1367
1368 static void
1369 xpc_handle_notify_mq_ack_uv(struct xpc_channel *ch,
1370                             struct xpc_notify_mq_msg_uv *msg)
1371 {
1372         struct xpc_send_msg_slot_uv *msg_slot;
1373         int entry = msg->hdr.msg_slot_number % ch->local_nentries;
1374
1375         msg_slot = &ch->sn.uv.send_msg_slots[entry];
1376
1377         BUG_ON(msg_slot->msg_slot_number != msg->hdr.msg_slot_number);
1378         msg_slot->msg_slot_number += ch->local_nentries;
1379
1380         if (msg_slot->func != NULL)
1381                 xpc_notify_sender_uv(ch, msg_slot, xpMsgDelivered);
1382
1383         xpc_free_msg_slot_uv(ch, msg_slot);
1384 }
1385
1386 static void
1387 xpc_handle_notify_mq_msg_uv(struct xpc_partition *part,
1388                             struct xpc_notify_mq_msg_uv *msg)
1389 {
1390         struct xpc_partition_uv *part_uv = &part->sn.uv;
1391         struct xpc_channel *ch;
1392         struct xpc_channel_uv *ch_uv;
1393         struct xpc_notify_mq_msg_uv *msg_slot;
1394         unsigned long irq_flags;
1395         int ch_number = msg->hdr.ch_number;
1396
1397         if (unlikely(ch_number >= part->nchannels)) {
1398                 dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received invalid "
1399                         "channel number=0x%x in message from partid=%d\n",
1400                         ch_number, XPC_PARTID(part));
1401
1402                 /* get hb checker to deactivate from the remote partition */
1403                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1404                 if (part_uv->act_state_req == 0)
1405                         xpc_activate_IRQ_rcvd++;
1406                 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
1407                 part_uv->reason = xpBadChannelNumber;
1408                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1409
1410                 wake_up_interruptible(&xpc_activate_IRQ_wq);
1411                 return;
1412         }
1413
1414         ch = &part->channels[ch_number];
1415         xpc_msgqueue_ref(ch);
1416
1417         if (!(ch->flags & XPC_C_CONNECTED)) {
1418                 xpc_msgqueue_deref(ch);
1419                 return;
1420         }
1421
1422         /* see if we're really dealing with an ACK for a previously sent msg */
1423         if (msg->hdr.size == 0) {
1424                 xpc_handle_notify_mq_ack_uv(ch, msg);
1425                 xpc_msgqueue_deref(ch);
1426                 return;
1427         }
1428
1429         /* we're dealing with a normal message sent via the notify_mq */
1430         ch_uv = &ch->sn.uv;
1431
1432         msg_slot = ch_uv->recv_msg_slots +
1433             (msg->hdr.msg_slot_number % ch->remote_nentries) * ch->entry_size;
1434
1435         BUG_ON(msg_slot->hdr.size != 0);
1436
1437         memcpy(msg_slot, msg, msg->hdr.size);
1438
1439         xpc_put_fifo_entry_uv(&ch_uv->recv_msg_list, &msg_slot->hdr.u.next);
1440
1441         if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) {
1442                 /*
1443                  * If there is an existing idle kthread get it to deliver
1444                  * the payload, otherwise we'll have to get the channel mgr
1445                  * for this partition to create a kthread to do the delivery.
1446                  */
1447                 if (atomic_read(&ch->kthreads_idle) > 0)
1448                         wake_up_nr(&ch->idle_wq, 1);
1449                 else
1450                         xpc_send_chctl_local_msgrequest_uv(part, ch->number);
1451         }
1452         xpc_msgqueue_deref(ch);
1453 }
1454
1455 static irqreturn_t
1456 xpc_handle_notify_IRQ_uv(int irq, void *dev_id)
1457 {
1458         struct xpc_notify_mq_msg_uv *msg;
1459         short partid;
1460         struct xpc_partition *part;
1461
1462         while ((msg = gru_get_next_message(xpc_notify_mq_uv->gru_mq_desc)) !=
1463                NULL) {
1464
1465                 partid = msg->hdr.partid;
1466                 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
1467                         dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received "
1468                                 "invalid partid=0x%x in message\n", partid);
1469                 } else {
1470                         part = &xpc_partitions[partid];
1471
1472                         if (xpc_part_ref(part)) {
1473                                 xpc_handle_notify_mq_msg_uv(part, msg);
1474                                 xpc_part_deref(part);
1475                         }
1476                 }
1477
1478                 gru_free_message(xpc_notify_mq_uv->gru_mq_desc, msg);
1479         }
1480
1481         return IRQ_HANDLED;
1482 }
1483
1484 static int
1485 xpc_n_of_deliverable_payloads_uv(struct xpc_channel *ch)
1486 {
1487         return xpc_n_of_fifo_entries_uv(&ch->sn.uv.recv_msg_list);
1488 }
1489
1490 static void
1491 xpc_process_msg_chctl_flags_uv(struct xpc_partition *part, int ch_number)
1492 {
1493         struct xpc_channel *ch = &part->channels[ch_number];
1494         int ndeliverable_payloads;
1495
1496         xpc_msgqueue_ref(ch);
1497
1498         ndeliverable_payloads = xpc_n_of_deliverable_payloads_uv(ch);
1499
1500         if (ndeliverable_payloads > 0 &&
1501             (ch->flags & XPC_C_CONNECTED) &&
1502             (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE)) {
1503
1504                 xpc_activate_kthreads(ch, ndeliverable_payloads);
1505         }
1506
1507         xpc_msgqueue_deref(ch);
1508 }
1509
1510 static enum xp_retval
1511 xpc_send_payload_uv(struct xpc_channel *ch, u32 flags, void *payload,
1512                     u16 payload_size, u8 notify_type, xpc_notify_func func,
1513                     void *key)
1514 {
1515         enum xp_retval ret = xpSuccess;
1516         struct xpc_send_msg_slot_uv *msg_slot = NULL;
1517         struct xpc_notify_mq_msg_uv *msg;
1518         u8 msg_buffer[XPC_NOTIFY_MSG_SIZE_UV];
1519         size_t msg_size;
1520
1521         DBUG_ON(notify_type != XPC_N_CALL);
1522
1523         msg_size = sizeof(struct xpc_notify_mq_msghdr_uv) + payload_size;
1524         if (msg_size > ch->entry_size)
1525                 return xpPayloadTooBig;
1526
1527         xpc_msgqueue_ref(ch);
1528
1529         if (ch->flags & XPC_C_DISCONNECTING) {
1530                 ret = ch->reason;
1531                 goto out_1;
1532         }
1533         if (!(ch->flags & XPC_C_CONNECTED)) {
1534                 ret = xpNotConnected;
1535                 goto out_1;
1536         }
1537
1538         ret = xpc_allocate_msg_slot_uv(ch, flags, &msg_slot);
1539         if (ret != xpSuccess)
1540                 goto out_1;
1541
1542         if (func != NULL) {
1543                 atomic_inc(&ch->n_to_notify);
1544
1545                 msg_slot->key = key;
1546                 smp_wmb(); /* a non-NULL func must hit memory after the key */
1547                 msg_slot->func = func;
1548
1549                 if (ch->flags & XPC_C_DISCONNECTING) {
1550                         ret = ch->reason;
1551                         goto out_2;
1552                 }
1553         }
1554
1555         msg = (struct xpc_notify_mq_msg_uv *)&msg_buffer;
1556         msg->hdr.partid = xp_partition_id;
1557         msg->hdr.ch_number = ch->number;
1558         msg->hdr.size = msg_size;
1559         msg->hdr.msg_slot_number = msg_slot->msg_slot_number;
1560         memcpy(&msg->payload, payload, payload_size);
1561
1562         ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1563                                msg_size);
1564         if (ret == xpSuccess)
1565                 goto out_1;
1566
1567         XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1568 out_2:
1569         if (func != NULL) {
1570                 /*
1571                  * Try to NULL the msg_slot's func field. If we fail, then
1572                  * xpc_notify_senders_of_disconnect_uv() beat us to it, in which
1573                  * case we need to pretend we succeeded to send the message
1574                  * since the user will get a callout for the disconnect error
1575                  * by xpc_notify_senders_of_disconnect_uv(), and to also get an
1576                  * error returned here will confuse them. Additionally, since
1577                  * in this case the channel is being disconnected we don't need
1578                  * to put the the msg_slot back on the free list.
1579                  */
1580                 if (cmpxchg(&msg_slot->func, func, NULL) != func) {
1581                         ret = xpSuccess;
1582                         goto out_1;
1583                 }
1584
1585                 msg_slot->key = NULL;
1586                 atomic_dec(&ch->n_to_notify);
1587         }
1588         xpc_free_msg_slot_uv(ch, msg_slot);
1589 out_1:
1590         xpc_msgqueue_deref(ch);
1591         return ret;
1592 }
1593
1594 /*
1595  * Tell the callers of xpc_send_notify() that the status of their payloads
1596  * is unknown because the channel is now disconnecting.
1597  *
1598  * We don't worry about putting these msg_slots on the free list since the
1599  * msg_slots themselves are about to be kfree'd.
1600  */
1601 static void
1602 xpc_notify_senders_of_disconnect_uv(struct xpc_channel *ch)
1603 {
1604         struct xpc_send_msg_slot_uv *msg_slot;
1605         int entry;
1606
1607         DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING));
1608
1609         for (entry = 0; entry < ch->local_nentries; entry++) {
1610
1611                 if (atomic_read(&ch->n_to_notify) == 0)
1612                         break;
1613
1614                 msg_slot = &ch->sn.uv.send_msg_slots[entry];
1615                 if (msg_slot->func != NULL)
1616                         xpc_notify_sender_uv(ch, msg_slot, ch->reason);
1617         }
1618 }
1619
1620 /*
1621  * Get the next deliverable message's payload.
1622  */
1623 static void *
1624 xpc_get_deliverable_payload_uv(struct xpc_channel *ch)
1625 {
1626         struct xpc_fifo_entry_uv *entry;
1627         struct xpc_notify_mq_msg_uv *msg;
1628         void *payload = NULL;
1629
1630         if (!(ch->flags & XPC_C_DISCONNECTING)) {
1631                 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.recv_msg_list);
1632                 if (entry != NULL) {
1633                         msg = container_of(entry, struct xpc_notify_mq_msg_uv,
1634                                            hdr.u.next);
1635                         payload = &msg->payload;
1636                 }
1637         }
1638         return payload;
1639 }
1640
1641 static void
1642 xpc_received_payload_uv(struct xpc_channel *ch, void *payload)
1643 {
1644         struct xpc_notify_mq_msg_uv *msg;
1645         enum xp_retval ret;
1646
1647         msg = container_of(payload, struct xpc_notify_mq_msg_uv, payload);
1648
1649         /* return an ACK to the sender of this message */
1650
1651         msg->hdr.partid = xp_partition_id;
1652         msg->hdr.size = 0;      /* size of zero indicates this is an ACK */
1653
1654         ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1655                                sizeof(struct xpc_notify_mq_msghdr_uv));
1656         if (ret != xpSuccess)
1657                 XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1658 }
1659
1660 static struct xpc_arch_operations xpc_arch_ops_uv = {
1661         .setup_partitions = xpc_setup_partitions_uv,
1662         .teardown_partitions = xpc_teardown_partitions_uv,
1663         .process_activate_IRQ_rcvd = xpc_process_activate_IRQ_rcvd_uv,
1664         .get_partition_rsvd_page_pa = xpc_get_partition_rsvd_page_pa_uv,
1665         .setup_rsvd_page = xpc_setup_rsvd_page_uv,
1666
1667         .allow_hb = xpc_allow_hb_uv,
1668         .disallow_hb = xpc_disallow_hb_uv,
1669         .disallow_all_hbs = xpc_disallow_all_hbs_uv,
1670         .increment_heartbeat = xpc_increment_heartbeat_uv,
1671         .offline_heartbeat = xpc_offline_heartbeat_uv,
1672         .online_heartbeat = xpc_online_heartbeat_uv,
1673         .heartbeat_init = xpc_heartbeat_init_uv,
1674         .heartbeat_exit = xpc_heartbeat_exit_uv,
1675         .get_remote_heartbeat = xpc_get_remote_heartbeat_uv,
1676
1677         .request_partition_activation =
1678                 xpc_request_partition_activation_uv,
1679         .request_partition_reactivation =
1680                 xpc_request_partition_reactivation_uv,
1681         .request_partition_deactivation =
1682                 xpc_request_partition_deactivation_uv,
1683         .cancel_partition_deactivation_request =
1684                 xpc_cancel_partition_deactivation_request_uv,
1685
1686         .setup_ch_structures = xpc_setup_ch_structures_uv,
1687         .teardown_ch_structures = xpc_teardown_ch_structures_uv,
1688
1689         .make_first_contact = xpc_make_first_contact_uv,
1690
1691         .get_chctl_all_flags = xpc_get_chctl_all_flags_uv,
1692         .send_chctl_closerequest = xpc_send_chctl_closerequest_uv,
1693         .send_chctl_closereply = xpc_send_chctl_closereply_uv,
1694         .send_chctl_openrequest = xpc_send_chctl_openrequest_uv,
1695         .send_chctl_openreply = xpc_send_chctl_openreply_uv,
1696         .send_chctl_opencomplete = xpc_send_chctl_opencomplete_uv,
1697         .process_msg_chctl_flags = xpc_process_msg_chctl_flags_uv,
1698
1699         .save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_uv,
1700
1701         .setup_msg_structures = xpc_setup_msg_structures_uv,
1702         .teardown_msg_structures = xpc_teardown_msg_structures_uv,
1703
1704         .indicate_partition_engaged = xpc_indicate_partition_engaged_uv,
1705         .indicate_partition_disengaged = xpc_indicate_partition_disengaged_uv,
1706         .assume_partition_disengaged = xpc_assume_partition_disengaged_uv,
1707         .partition_engaged = xpc_partition_engaged_uv,
1708         .any_partition_engaged = xpc_any_partition_engaged_uv,
1709
1710         .n_of_deliverable_payloads = xpc_n_of_deliverable_payloads_uv,
1711         .send_payload = xpc_send_payload_uv,
1712         .get_deliverable_payload = xpc_get_deliverable_payload_uv,
1713         .received_payload = xpc_received_payload_uv,
1714         .notify_senders_of_disconnect = xpc_notify_senders_of_disconnect_uv,
1715 };
1716
1717 int
1718 xpc_init_uv(void)
1719 {
1720         xpc_arch_ops = xpc_arch_ops_uv;
1721
1722         if (sizeof(struct xpc_notify_mq_msghdr_uv) > XPC_MSG_HDR_MAX_SIZE) {
1723                 dev_err(xpc_part, "xpc_notify_mq_msghdr_uv is larger than %d\n",
1724                         XPC_MSG_HDR_MAX_SIZE);
1725                 return -E2BIG;
1726         }
1727
1728         xpc_activate_mq_uv = xpc_create_gru_mq_uv(XPC_ACTIVATE_MQ_SIZE_UV, 0,
1729                                                   XPC_ACTIVATE_IRQ_NAME,
1730                                                   xpc_handle_activate_IRQ_uv);
1731         if (IS_ERR(xpc_activate_mq_uv))
1732                 return PTR_ERR(xpc_activate_mq_uv);
1733
1734         xpc_notify_mq_uv = xpc_create_gru_mq_uv(XPC_NOTIFY_MQ_SIZE_UV, 0,
1735                                                 XPC_NOTIFY_IRQ_NAME,
1736                                                 xpc_handle_notify_IRQ_uv);
1737         if (IS_ERR(xpc_notify_mq_uv)) {
1738                 xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1739                 return PTR_ERR(xpc_notify_mq_uv);
1740         }
1741
1742         return 0;
1743 }
1744
1745 void
1746 xpc_exit_uv(void)
1747 {
1748         xpc_destroy_gru_mq_uv(xpc_notify_mq_uv);
1749         xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1750 }