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