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_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
 161         int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
 162
 163         ret = sn_mq_watchlist_alloc(mmr_pnode, (void *)uv_gpa(mq->address),
 164                                     mq->order, &mq->mmr_offset);
 165         if (ret < 0) {
 166                 dev_err(xpc_part, "sn_mq_watchlist_alloc() failed, ret=%d\n",
 167                         ret);
 168                 return -EBUSY;
 169         }
 170 #elif defined CONFIG_X86_64
 171         ret = uv_bios_mq_watchlist_alloc(uv_gpa(mq->address),
 172                                          mq->order, &mq->mmr_offset);
 173         if (ret < 0) {
 174                 dev_err(xpc_part, "uv_bios_mq_watchlist_alloc() failed, "
 175                         "ret=%d\n", ret);
 176                 return ret;
 177         }
 178 #else
 179         #error not a supported configuration
 180 #endif
 181
 182         mq->watchlist_num = ret;
 183         return 0;
 184 }
 185
 186 static void
 187 xpc_gru_mq_watchlist_free_uv(struct xpc_gru_mq_uv *mq)
 188 {
 189         int ret;
 190         int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
 191
 192 #if defined CONFIG_X86_64
 193         ret = uv_bios_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
 194         BUG_ON(ret != BIOS_STATUS_SUCCESS);
 195 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
 196         ret = sn_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
 197         BUG_ON(ret != SALRET_OK);
 198 #else
 199         #error not a supported configuration
 200 #endif
 201 }
 202
 203 static struct xpc_gru_mq_uv *
 204 xpc_create_gru_mq_uv(unsigned int mq_size, int cpu, char *irq_name,
 205                      irq_handler_t irq_handler)
 206 {
 207         enum xp_retval xp_ret;
 208         int ret;
 209         int nid;
 210         int pg_order;
 211         struct page *page;
 212         struct xpc_gru_mq_uv *mq;
 213         struct uv_IO_APIC_route_entry *mmr_value;
 214
 215         mq = kmalloc(sizeof(struct xpc_gru_mq_uv), GFP_KERNEL);
 216         if (mq == NULL) {
 217                 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
 218                         "a xpc_gru_mq_uv structure\n");
 219                 ret = -ENOMEM;
 220                 goto out_0;
 221         }
 222
 223         mq->gru_mq_desc = kzalloc(sizeof(struct gru_message_queue_desc),
 224                                   GFP_KERNEL);
 225         if (mq->gru_mq_desc == NULL) {
 226                 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
 227                         "a gru_message_queue_desc structure\n");
 228                 ret = -ENOMEM;
 229                 goto out_1;
 230         }
 231
 232         pg_order = get_order(mq_size);
 233         mq->order = pg_order + PAGE_SHIFT;
 234         mq_size = 1UL << mq->order;
 235
 236         mq->mmr_blade = uv_cpu_to_blade_id(cpu);
 237
 238         nid = cpu_to_node(cpu);
 239         page = alloc_pages_exact_node(nid, GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
 240                                 pg_order);
 241         if (page == NULL) {
 242                 dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to alloc %d "
 243                         "bytes of memory on nid=%d for GRU mq\n", mq_size, nid);
 244                 ret = -ENOMEM;
 245                 goto out_2;
 246         }
 247         mq->address = page_address(page);
 248
 249         /* enable generation of irq when GRU mq operation occurs to this mq */
 250         ret = xpc_gru_mq_watchlist_alloc_uv(mq);
 251         if (ret != 0)
 252                 goto out_3;
 253
 254         ret = xpc_get_gru_mq_irq_uv(mq, cpu, irq_name);
 255         if (ret != 0)
 256                 goto out_4;
 257
 258         ret = request_irq(mq->irq, irq_handler, 0, irq_name, NULL);
 259         if (ret != 0) {
 260                 dev_err(xpc_part, "request_irq(irq=%d) returned error=%d\n",
 261                         mq->irq, -ret);
 262                 goto out_5;
 263         }
 264
 265         mmr_value = (struct uv_IO_APIC_route_entry *)&mq->mmr_value;
 266         ret = gru_create_message_queue(mq->gru_mq_desc, mq->address, mq_size,
 267                                        nid, mmr_value->vector, mmr_value->dest);
 268         if (ret != 0) {
 269                 dev_err(xpc_part, "gru_create_message_queue() returned "
 270                         "error=%d\n", ret);
 271                 ret = -EINVAL;
 272                 goto out_6;
 273         }
 274
 275         /* allow other partitions to access this GRU mq */
 276         xp_ret = xp_expand_memprotect(xp_pa(mq->address), mq_size);
 277         if (xp_ret != xpSuccess) {
 278                 ret = -EACCES;
 279                 goto out_6;
 280         }
 281
 282         return mq;
 283
 284         /* something went wrong */
 285 out_6:
 286         free_irq(mq->irq, NULL);
 287 out_5:
 288         xpc_release_gru_mq_irq_uv(mq);
 289 out_4:
 290         xpc_gru_mq_watchlist_free_uv(mq);
 291 out_3:
 292         free_pages((unsigned long)mq->address, pg_order);
 293 out_2:
 294         kfree(mq->gru_mq_desc);
 295 out_1:
 296         kfree(mq);
 297 out_0:
 298         return ERR_PTR(ret);
 299 }
 300
 301 static void
 302 xpc_destroy_gru_mq_uv(struct xpc_gru_mq_uv *mq)
 303 {
 304         unsigned int mq_size;
 305         int pg_order;
 306         int ret;
 307
 308         /* disallow other partitions to access GRU mq */
 309         mq_size = 1UL << mq->order;
 310         ret = xp_restrict_memprotect(xp_pa(mq->address), mq_size);
 311         BUG_ON(ret != xpSuccess);
 312
 313         /* unregister irq handler and release mq irq/vector mapping */
 314         free_irq(mq->irq, NULL);
 315         xpc_release_gru_mq_irq_uv(mq);
 316
 317         /* disable generation of irq when GRU mq op occurs to this mq */
 318         xpc_gru_mq_watchlist_free_uv(mq);
 319
 320         pg_order = mq->order - PAGE_SHIFT;
 321         free_pages((unsigned long)mq->address, pg_order);
 322
 323         kfree(mq);
 324 }
 325
 326 static enum xp_retval
 327 xpc_send_gru_msg(struct gru_message_queue_desc *gru_mq_desc, void *msg,
 328                  size_t msg_size)
 329 {
 330         enum xp_retval xp_ret;
 331         int ret;
 332
 333         while (1) {
 334                 ret = gru_send_message_gpa(gru_mq_desc, msg, msg_size);
 335                 if (ret == MQE_OK) {
 336                         xp_ret = xpSuccess;
 337                         break;
 338                 }
 339
 340                 if (ret == MQE_QUEUE_FULL) {
 341                         dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
 342                                 "error=MQE_QUEUE_FULL\n");
 343                         /* !!! handle QLimit reached; delay & try again */
 344                         /* ??? Do we add a limit to the number of retries? */
 345                         (void)msleep_interruptible(10);
 346                 } else if (ret == MQE_CONGESTION) {
 347                         dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
 348                                 "error=MQE_CONGESTION\n");
 349                         /* !!! handle LB Overflow; simply try again */
 350                         /* ??? Do we add a limit to the number of retries? */
 351                 } else {
 352                         /* !!! Currently this is MQE_UNEXPECTED_CB_ERR */
 353                         dev_err(xpc_chan, "gru_send_message_gpa() returned "
 354                                 "error=%d\n", ret);
 355                         xp_ret = xpGruSendMqError;
 356                         break;
 357                 }
 358         }
 359         return xp_ret;
 360 }
 361
 362 static void
 363 xpc_process_activate_IRQ_rcvd_uv(void)
 364 {
 365         unsigned long irq_flags;
 366         short partid;
 367         struct xpc_partition *part;
 368         u8 act_state_req;
 369
 370         DBUG_ON(xpc_activate_IRQ_rcvd == 0);
 371
 372         spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 373         for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
 374                 part = &xpc_partitions[partid];
 375
 376                 if (part->sn.uv.act_state_req == 0)
 377                         continue;
 378
 379                 xpc_activate_IRQ_rcvd--;
 380                 BUG_ON(xpc_activate_IRQ_rcvd < 0);
 381
 382                 act_state_req = part->sn.uv.act_state_req;
 383                 part->sn.uv.act_state_req = 0;
 384                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 385
 386                 if (act_state_req == XPC_P_ASR_ACTIVATE_UV) {
 387                         if (part->act_state == XPC_P_AS_INACTIVE)
 388                                 xpc_activate_partition(part);
 389                         else if (part->act_state == XPC_P_AS_DEACTIVATING)
 390                                 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
 391
 392                 } else if (act_state_req == XPC_P_ASR_REACTIVATE_UV) {
 393                         if (part->act_state == XPC_P_AS_INACTIVE)
 394                                 xpc_activate_partition(part);
 395                         else
 396                                 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
 397
 398                 } else if (act_state_req == XPC_P_ASR_DEACTIVATE_UV) {
 399                         XPC_DEACTIVATE_PARTITION(part, part->sn.uv.reason);
 400
 401                 } else {
 402                         BUG();
 403                 }
 404
 405                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 406                 if (xpc_activate_IRQ_rcvd == 0)
 407                         break;
 408         }
 409         spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 410
 411 }
 412
 413 static void
 414 xpc_handle_activate_mq_msg_uv(struct xpc_partition *part,
 415                               struct xpc_activate_mq_msghdr_uv *msg_hdr,
 416                               int *wakeup_hb_checker)
 417 {
 418         unsigned long irq_flags;
 419         struct xpc_partition_uv *part_uv = &part->sn.uv;
 420         struct xpc_openclose_args *args;
 421
 422         part_uv->remote_act_state = msg_hdr->act_state;
 423
 424         switch (msg_hdr->type) {
 425         case XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV:
 426                 /* syncing of remote_act_state was just done above */
 427                 break;
 428
 429         case XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV: {
 430                 struct xpc_activate_mq_msg_activate_req_uv *msg;
 431
 432                 /*
 433                  * ??? Do we deal here with ts_jiffies being different
 434                  * ??? if act_state != XPC_P_AS_INACTIVE instead of
 435                  * ??? below?
 436                  */
 437                 msg = container_of(msg_hdr, struct
 438                                    xpc_activate_mq_msg_activate_req_uv, hdr);
 439
 440                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 441                 if (part_uv->act_state_req == 0)
 442                         xpc_activate_IRQ_rcvd++;
 443                 part_uv->act_state_req = XPC_P_ASR_ACTIVATE_UV;
 444                 part->remote_rp_pa = msg->rp_gpa; /* !!! _pa is _gpa */
 445                 part->remote_rp_ts_jiffies = msg_hdr->rp_ts_jiffies;
 446                 part_uv->heartbeat_gpa = msg->heartbeat_gpa;
 447
 448                 if (msg->activate_gru_mq_desc_gpa !=
 449                     part_uv->activate_gru_mq_desc_gpa) {
 450                         spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
 451                         part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
 452                         spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
 453                         part_uv->activate_gru_mq_desc_gpa =
 454                             msg->activate_gru_mq_desc_gpa;
 455                 }
 456                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 457
 458                 (*wakeup_hb_checker)++;
 459                 break;
 460         }
 461         case XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV: {
 462                 struct xpc_activate_mq_msg_deactivate_req_uv *msg;
 463
 464                 msg = container_of(msg_hdr, struct
 465                                    xpc_activate_mq_msg_deactivate_req_uv, hdr);
 466
 467                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 468                 if (part_uv->act_state_req == 0)
 469                         xpc_activate_IRQ_rcvd++;
 470                 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
 471                 part_uv->reason = msg->reason;
 472                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 473
 474                 (*wakeup_hb_checker)++;
 475                 return;
 476         }
 477         case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV: {
 478                 struct xpc_activate_mq_msg_chctl_closerequest_uv *msg;
 479
 480                 msg = container_of(msg_hdr, struct
 481                                    xpc_activate_mq_msg_chctl_closerequest_uv,
 482                                    hdr);
 483                 args = &part->remote_openclose_args[msg->ch_number];
 484                 args->reason = msg->reason;
 485
 486                 spin_lock_irqsave(&part->chctl_lock, irq_flags);
 487                 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREQUEST;
 488                 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
 489
 490                 xpc_wakeup_channel_mgr(part);
 491                 break;
 492         }
 493         case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV: {
 494                 struct xpc_activate_mq_msg_chctl_closereply_uv *msg;
 495
 496                 msg = container_of(msg_hdr, struct
 497                                    xpc_activate_mq_msg_chctl_closereply_uv,
 498                                    hdr);
 499
 500                 spin_lock_irqsave(&part->chctl_lock, irq_flags);
 501                 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREPLY;
 502                 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
 503
 504                 xpc_wakeup_channel_mgr(part);
 505                 break;
 506         }
 507         case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV: {
 508                 struct xpc_activate_mq_msg_chctl_openrequest_uv *msg;
 509
 510                 msg = container_of(msg_hdr, struct
 511                                    xpc_activate_mq_msg_chctl_openrequest_uv,
 512                                    hdr);
 513                 args = &part->remote_openclose_args[msg->ch_number];
 514                 args->entry_size = msg->entry_size;
 515                 args->local_nentries = msg->local_nentries;
 516
 517                 spin_lock_irqsave(&part->chctl_lock, irq_flags);
 518                 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREQUEST;
 519                 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
 520
 521                 xpc_wakeup_channel_mgr(part);
 522                 break;
 523         }
 524         case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV: {
 525                 struct xpc_activate_mq_msg_chctl_openreply_uv *msg;
 526
 527                 msg = container_of(msg_hdr, struct
 528                                    xpc_activate_mq_msg_chctl_openreply_uv, hdr);
 529                 args = &part->remote_openclose_args[msg->ch_number];
 530                 args->remote_nentries = msg->remote_nentries;
 531                 args->local_nentries = msg->local_nentries;
 532                 args->local_msgqueue_pa = msg->notify_gru_mq_desc_gpa;
 533
 534                 spin_lock_irqsave(&part->chctl_lock, irq_flags);
 535                 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREPLY;
 536                 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
 537
 538                 xpc_wakeup_channel_mgr(part);
 539                 break;
 540         }
 541         case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV: {
 542                 struct xpc_activate_mq_msg_chctl_opencomplete_uv *msg;
 543
 544                 msg = container_of(msg_hdr, struct
 545                                 xpc_activate_mq_msg_chctl_opencomplete_uv, hdr);
 546                 spin_lock_irqsave(&part->chctl_lock, irq_flags);
 547                 part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENCOMPLETE;
 548                 spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
 549
 550                 xpc_wakeup_channel_mgr(part);
 551         }
 552         case XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV:
 553                 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
 554                 part_uv->flags |= XPC_P_ENGAGED_UV;
 555                 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
 556                 break;
 557
 558         case XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV:
 559                 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
 560                 part_uv->flags &= ~XPC_P_ENGAGED_UV;
 561                 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
 562                 break;
 563
 564         default:
 565                 dev_err(xpc_part, "received unknown activate_mq msg type=%d "
 566                         "from partition=%d\n", msg_hdr->type, XPC_PARTID(part));
 567
 568                 /* get hb checker to deactivate from the remote partition */
 569                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 570                 if (part_uv->act_state_req == 0)
 571                         xpc_activate_IRQ_rcvd++;
 572                 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
 573                 part_uv->reason = xpBadMsgType;
 574                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 575
 576                 (*wakeup_hb_checker)++;
 577                 return;
 578         }
 579
 580         if (msg_hdr->rp_ts_jiffies != part->remote_rp_ts_jiffies &&
 581             part->remote_rp_ts_jiffies != 0) {
 582                 /*
 583                  * ??? Does what we do here need to be sensitive to
 584                  * ??? act_state or remote_act_state?
 585                  */
 586                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 587                 if (part_uv->act_state_req == 0)
 588                         xpc_activate_IRQ_rcvd++;
 589                 part_uv->act_state_req = XPC_P_ASR_REACTIVATE_UV;
 590                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 591
 592                 (*wakeup_hb_checker)++;
 593         }
 594 }
 595
 596 static irqreturn_t
 597 xpc_handle_activate_IRQ_uv(int irq, void *dev_id)
 598 {
 599         struct xpc_activate_mq_msghdr_uv *msg_hdr;
 600         short partid;
 601         struct xpc_partition *part;
 602         int wakeup_hb_checker = 0;
 603         int part_referenced;
 604
 605         while (1) {
 606                 msg_hdr = gru_get_next_message(xpc_activate_mq_uv->gru_mq_desc);
 607                 if (msg_hdr == NULL)
 608                         break;
 609
 610                 partid = msg_hdr->partid;
 611                 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
 612                         dev_err(xpc_part, "xpc_handle_activate_IRQ_uv() "
 613                                 "received invalid partid=0x%x in message\n",
 614                                 partid);
 615                 } else {
 616                         part = &xpc_partitions[partid];
 617
 618                         part_referenced = xpc_part_ref(part);
 619                         xpc_handle_activate_mq_msg_uv(part, msg_hdr,
 620                                                       &wakeup_hb_checker);
 621                         if (part_referenced)
 622                                 xpc_part_deref(part);
 623                 }
 624
 625                 gru_free_message(xpc_activate_mq_uv->gru_mq_desc, msg_hdr);
 626         }
 627
 628         if (wakeup_hb_checker)
 629                 wake_up_interruptible(&xpc_activate_IRQ_wq);
 630
 631         return IRQ_HANDLED;
 632 }
 633
 634 static enum xp_retval
 635 xpc_cache_remote_gru_mq_desc_uv(struct gru_message_queue_desc *gru_mq_desc,
 636                                 unsigned long gru_mq_desc_gpa)
 637 {
 638         enum xp_retval ret;
 639
 640         ret = xp_remote_memcpy(uv_gpa(gru_mq_desc), gru_mq_desc_gpa,
 641                                sizeof(struct gru_message_queue_desc));
 642         if (ret == xpSuccess)
 643                 gru_mq_desc->mq = NULL;
 644
 645         return ret;
 646 }
 647
 648 static enum xp_retval
 649 xpc_send_activate_IRQ_uv(struct xpc_partition *part, void *msg, size_t msg_size,
 650                          int msg_type)
 651 {
 652         struct xpc_activate_mq_msghdr_uv *msg_hdr = msg;
 653         struct xpc_partition_uv *part_uv = &part->sn.uv;
 654         struct gru_message_queue_desc *gru_mq_desc;
 655         unsigned long irq_flags;
 656         enum xp_retval ret;
 657
 658         DBUG_ON(msg_size > XPC_ACTIVATE_MSG_SIZE_UV);
 659
 660         msg_hdr->type = msg_type;
 661         msg_hdr->partid = xp_partition_id;
 662         msg_hdr->act_state = part->act_state;
 663         msg_hdr->rp_ts_jiffies = xpc_rsvd_page->ts_jiffies;
 664
 665         mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
 666 again:
 667         if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV)) {
 668                 gru_mq_desc = part_uv->cached_activate_gru_mq_desc;
 669                 if (gru_mq_desc == NULL) {
 670                         gru_mq_desc = kmalloc(sizeof(struct
 671                                               gru_message_queue_desc),
 672                                               GFP_KERNEL);
 673                         if (gru_mq_desc == NULL) {
 674                                 ret = xpNoMemory;
 675                                 goto done;
 676                         }
 677                         part_uv->cached_activate_gru_mq_desc = gru_mq_desc;
 678                 }
 679
 680                 ret = xpc_cache_remote_gru_mq_desc_uv(gru_mq_desc,
 681                                                       part_uv->
 682                                                       activate_gru_mq_desc_gpa);
 683                 if (ret != xpSuccess)
 684                         goto done;
 685
 686                 spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
 687                 part_uv->flags |= XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
 688                 spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
 689         }
 690
 691         /* ??? Is holding a spin_lock (ch->lock) during this call a bad idea? */
 692         ret = xpc_send_gru_msg(part_uv->cached_activate_gru_mq_desc, msg,
 693                                msg_size);
 694         if (ret != xpSuccess) {
 695                 smp_rmb();      /* ensure a fresh copy of part_uv->flags */
 696                 if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV))
 697                         goto again;
 698         }
 699 done:
 700         mutex_unlock(&part_uv->cached_activate_gru_mq_desc_mutex);
 701         return ret;
 702 }
 703
 704 static void
 705 xpc_send_activate_IRQ_part_uv(struct xpc_partition *part, void *msg,
 706                               size_t msg_size, int msg_type)
 707 {
 708         enum xp_retval ret;
 709
 710         ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
 711         if (unlikely(ret != xpSuccess))
 712                 XPC_DEACTIVATE_PARTITION(part, ret);
 713 }
 714
 715 static void
 716 xpc_send_activate_IRQ_ch_uv(struct xpc_channel *ch, unsigned long *irq_flags,
 717                          void *msg, size_t msg_size, int msg_type)
 718 {
 719         struct xpc_partition *part = &xpc_partitions[ch->partid];
 720         enum xp_retval ret;
 721
 722         ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
 723         if (unlikely(ret != xpSuccess)) {
 724                 if (irq_flags != NULL)
 725                         spin_unlock_irqrestore(&ch->lock, *irq_flags);
 726
 727                 XPC_DEACTIVATE_PARTITION(part, ret);
 728
 729                 if (irq_flags != NULL)
 730                         spin_lock_irqsave(&ch->lock, *irq_flags);
 731         }
 732 }
 733
 734 static void
 735 xpc_send_local_activate_IRQ_uv(struct xpc_partition *part, int act_state_req)
 736 {
 737         unsigned long irq_flags;
 738         struct xpc_partition_uv *part_uv = &part->sn.uv;
 739
 740         /*
 741          * !!! Make our side think that the remote partition sent an activate
 742          * !!! mq message our way by doing what the activate IRQ handler would
 743          * !!! do had one really been sent.
 744          */
 745
 746         spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 747         if (part_uv->act_state_req == 0)
 748                 xpc_activate_IRQ_rcvd++;
 749         part_uv->act_state_req = act_state_req;
 750         spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 751
 752         wake_up_interruptible(&xpc_activate_IRQ_wq);
 753 }
 754
 755 static enum xp_retval
 756 xpc_get_partition_rsvd_page_pa_uv(void *buf, u64 *cookie, unsigned long *rp_pa,
 757                                   size_t *len)
 758 {
 759         s64 status;
 760         enum xp_retval ret;
 761
 762 #if defined CONFIG_X86_64
 763         status = uv_bios_reserved_page_pa((u64)buf, cookie, (u64 *)rp_pa,
 764                                           (u64 *)len);
 765         if (status == BIOS_STATUS_SUCCESS)
 766                 ret = xpSuccess;
 767         else if (status == BIOS_STATUS_MORE_PASSES)
 768                 ret = xpNeedMoreInfo;
 769         else
 770                 ret = xpBiosError;
 771
 772 #elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
 773         status = sn_partition_reserved_page_pa((u64)buf, cookie, rp_pa, len);
 774         if (status == SALRET_OK)
 775                 ret = xpSuccess;
 776         else if (status == SALRET_MORE_PASSES)
 777                 ret = xpNeedMoreInfo;
 778         else
 779                 ret = xpSalError;
 780
 781 #else
 782         #error not a supported configuration
 783 #endif
 784
 785         return ret;
 786 }
 787
 788 static int
 789 xpc_setup_rsvd_page_uv(struct xpc_rsvd_page *rp)
 790 {
 791         xpc_heartbeat_uv =
 792             &xpc_partitions[sn_partition_id].sn.uv.cached_heartbeat;
 793         rp->sn.uv.heartbeat_gpa = uv_gpa(xpc_heartbeat_uv);
 794         rp->sn.uv.activate_gru_mq_desc_gpa =
 795             uv_gpa(xpc_activate_mq_uv->gru_mq_desc);
 796         return 0;
 797 }
 798
 799 static void
 800 xpc_allow_hb_uv(short partid)
 801 {
 802 }
 803
 804 static void
 805 xpc_disallow_hb_uv(short partid)
 806 {
 807 }
 808
 809 static void
 810 xpc_disallow_all_hbs_uv(void)
 811 {
 812 }
 813
 814 static void
 815 xpc_increment_heartbeat_uv(void)
 816 {
 817         xpc_heartbeat_uv->value++;
 818 }
 819
 820 static void
 821 xpc_offline_heartbeat_uv(void)
 822 {
 823         xpc_increment_heartbeat_uv();
 824         xpc_heartbeat_uv->offline = 1;
 825 }
 826
 827 static void
 828 xpc_online_heartbeat_uv(void)
 829 {
 830         xpc_increment_heartbeat_uv();
 831         xpc_heartbeat_uv->offline = 0;
 832 }
 833
 834 static void
 835 xpc_heartbeat_init_uv(void)
 836 {
 837         xpc_heartbeat_uv->value = 1;
 838         xpc_heartbeat_uv->offline = 0;
 839 }
 840
 841 static void
 842 xpc_heartbeat_exit_uv(void)
 843 {
 844         xpc_offline_heartbeat_uv();
 845 }
 846
 847 static enum xp_retval
 848 xpc_get_remote_heartbeat_uv(struct xpc_partition *part)
 849 {
 850         struct xpc_partition_uv *part_uv = &part->sn.uv;
 851         enum xp_retval ret;
 852
 853         ret = xp_remote_memcpy(uv_gpa(&part_uv->cached_heartbeat),
 854                                part_uv->heartbeat_gpa,
 855                                sizeof(struct xpc_heartbeat_uv));
 856         if (ret != xpSuccess)
 857                 return ret;
 858
 859         if (part_uv->cached_heartbeat.value == part->last_heartbeat &&
 860             !part_uv->cached_heartbeat.offline) {
 861
 862                 ret = xpNoHeartbeat;
 863         } else {
 864                 part->last_heartbeat = part_uv->cached_heartbeat.value;
 865         }
 866         return ret;
 867 }
 868
 869 static void
 870 xpc_request_partition_activation_uv(struct xpc_rsvd_page *remote_rp,
 871                                     unsigned long remote_rp_gpa, int nasid)
 872 {
 873         short partid = remote_rp->SAL_partid;
 874         struct xpc_partition *part = &xpc_partitions[partid];
 875         struct xpc_activate_mq_msg_activate_req_uv msg;
 876
 877         part->remote_rp_pa = remote_rp_gpa; /* !!! _pa here is really _gpa */
 878         part->remote_rp_ts_jiffies = remote_rp->ts_jiffies;
 879         part->sn.uv.heartbeat_gpa = remote_rp->sn.uv.heartbeat_gpa;
 880         part->sn.uv.activate_gru_mq_desc_gpa =
 881             remote_rp->sn.uv.activate_gru_mq_desc_gpa;
 882
 883         /*
 884          * ??? Is it a good idea to make this conditional on what is
 885          * ??? potentially stale state information?
 886          */
 887         if (part->sn.uv.remote_act_state == XPC_P_AS_INACTIVE) {
 888                 msg.rp_gpa = uv_gpa(xpc_rsvd_page);
 889                 msg.heartbeat_gpa = xpc_rsvd_page->sn.uv.heartbeat_gpa;
 890                 msg.activate_gru_mq_desc_gpa =
 891                     xpc_rsvd_page->sn.uv.activate_gru_mq_desc_gpa;
 892                 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
 893                                            XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV);
 894         }
 895
 896         if (part->act_state == XPC_P_AS_INACTIVE)
 897                 xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
 898 }
 899
 900 static void
 901 xpc_request_partition_reactivation_uv(struct xpc_partition *part)
 902 {
 903         xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
 904 }
 905
 906 static void
 907 xpc_request_partition_deactivation_uv(struct xpc_partition *part)
 908 {
 909         struct xpc_activate_mq_msg_deactivate_req_uv msg;
 910
 911         /*
 912          * ??? Is it a good idea to make this conditional on what is
 913          * ??? potentially stale state information?
 914          */
 915         if (part->sn.uv.remote_act_state != XPC_P_AS_DEACTIVATING &&
 916             part->sn.uv.remote_act_state != XPC_P_AS_INACTIVE) {
 917
 918                 msg.reason = part->reason;
 919                 xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
 920                                          XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV);
 921         }
 922 }
 923
 924 static void
 925 xpc_cancel_partition_deactivation_request_uv(struct xpc_partition *part)
 926 {
 927         /* nothing needs to be done */
 928         return;
 929 }
 930
 931 static void
 932 xpc_init_fifo_uv(struct xpc_fifo_head_uv *head)
 933 {
 934         head->first = NULL;
 935         head->last = NULL;
 936         spin_lock_init(&head->lock);
 937         head->n_entries = 0;
 938 }
 939
 940 static void *
 941 xpc_get_fifo_entry_uv(struct xpc_fifo_head_uv *head)
 942 {
 943         unsigned long irq_flags;
 944         struct xpc_fifo_entry_uv *first;
 945
 946         spin_lock_irqsave(&head->lock, irq_flags);
 947         first = head->first;
 948         if (head->first != NULL) {
 949                 head->first = first->next;
 950                 if (head->first == NULL)
 951                         head->last = NULL;
 952
 953                 head->n_entries--;
 954                 BUG_ON(head->n_entries < 0);
 955
 956                 first->next = NULL;
 957         }
 958         spin_unlock_irqrestore(&head->lock, irq_flags);
 959         return first;
 960 }
 961
 962 static void
 963 xpc_put_fifo_entry_uv(struct xpc_fifo_head_uv *head,
 964                       struct xpc_fifo_entry_uv *last)
 965 {
 966         unsigned long irq_flags;
 967
 968         last->next = NULL;
 969         spin_lock_irqsave(&head->lock, irq_flags);
 970         if (head->last != NULL)
 971                 head->last->next = last;
 972         else
 973                 head->first = last;
 974         head->last = last;
 975         head->n_entries++;
 976         spin_unlock_irqrestore(&head->lock, irq_flags);
 977 }
 978
 979 static int
 980 xpc_n_of_fifo_entries_uv(struct xpc_fifo_head_uv *head)
 981 {
 982         return head->n_entries;
 983 }
 984
 985 /*
 986  * Setup the channel structures that are uv specific.
 987  */
 988 static enum xp_retval
 989 xpc_setup_ch_structures_uv(struct xpc_partition *part)
 990 {
 991         struct xpc_channel_uv *ch_uv;
 992         int ch_number;
 993
 994         for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
 995                 ch_uv = &part->channels[ch_number].sn.uv;
 996
 997                 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
 998                 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
 999         }
1000
1001         return xpSuccess;
1002 }
1003
1004 /*
1005  * Teardown the channel structures that are uv specific.
1006  */
1007 static void
1008 xpc_teardown_ch_structures_uv(struct xpc_partition *part)
1009 {
1010         /* nothing needs to be done */
1011         return;
1012 }
1013
1014 static enum xp_retval
1015 xpc_make_first_contact_uv(struct xpc_partition *part)
1016 {
1017         struct xpc_activate_mq_msg_uv msg;
1018
1019         /*
1020          * We send a sync msg to get the remote partition's remote_act_state
1021          * updated to our current act_state which at this point should
1022          * be XPC_P_AS_ACTIVATING.
1023          */
1024         xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1025                                       XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV);
1026
1027         while (!((part->sn.uv.remote_act_state == XPC_P_AS_ACTIVATING) ||
1028                  (part->sn.uv.remote_act_state == XPC_P_AS_ACTIVE))) {
1029
1030                 dev_dbg(xpc_part, "waiting to make first contact with "
1031                         "partition %d\n", XPC_PARTID(part));
1032
1033                 /* wait a 1/4 of a second or so */
1034                 (void)msleep_interruptible(250);
1035
1036                 if (part->act_state == XPC_P_AS_DEACTIVATING)
1037                         return part->reason;
1038         }
1039
1040         return xpSuccess;
1041 }
1042
1043 static u64
1044 xpc_get_chctl_all_flags_uv(struct xpc_partition *part)
1045 {
1046         unsigned long irq_flags;
1047         union xpc_channel_ctl_flags chctl;
1048
1049         spin_lock_irqsave(&part->chctl_lock, irq_flags);
1050         chctl = part->chctl;
1051         if (chctl.all_flags != 0)
1052                 part->chctl.all_flags = 0;
1053
1054         spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1055         return chctl.all_flags;
1056 }
1057
1058 static enum xp_retval
1059 xpc_allocate_send_msg_slot_uv(struct xpc_channel *ch)
1060 {
1061         struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1062         struct xpc_send_msg_slot_uv *msg_slot;
1063         unsigned long irq_flags;
1064         int nentries;
1065         int entry;
1066         size_t nbytes;
1067
1068         for (nentries = ch->local_nentries; nentries > 0; nentries--) {
1069                 nbytes = nentries * sizeof(struct xpc_send_msg_slot_uv);
1070                 ch_uv->send_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1071                 if (ch_uv->send_msg_slots == NULL)
1072                         continue;
1073
1074                 for (entry = 0; entry < nentries; entry++) {
1075                         msg_slot = &ch_uv->send_msg_slots[entry];
1076
1077                         msg_slot->msg_slot_number = entry;
1078                         xpc_put_fifo_entry_uv(&ch_uv->msg_slot_free_list,
1079                                               &msg_slot->next);
1080                 }
1081
1082                 spin_lock_irqsave(&ch->lock, irq_flags);
1083                 if (nentries < ch->local_nentries)
1084                         ch->local_nentries = nentries;
1085                 spin_unlock_irqrestore(&ch->lock, irq_flags);
1086                 return xpSuccess;
1087         }
1088
1089         return xpNoMemory;
1090 }
1091
1092 static enum xp_retval
1093 xpc_allocate_recv_msg_slot_uv(struct xpc_channel *ch)
1094 {
1095         struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1096         struct xpc_notify_mq_msg_uv *msg_slot;
1097         unsigned long irq_flags;
1098         int nentries;
1099         int entry;
1100         size_t nbytes;
1101
1102         for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
1103                 nbytes = nentries * ch->entry_size;
1104                 ch_uv->recv_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1105                 if (ch_uv->recv_msg_slots == NULL)
1106                         continue;
1107
1108                 for (entry = 0; entry < nentries; entry++) {
1109                         msg_slot = ch_uv->recv_msg_slots +
1110                             entry * ch->entry_size;
1111
1112                         msg_slot->hdr.msg_slot_number = entry;
1113                 }
1114
1115                 spin_lock_irqsave(&ch->lock, irq_flags);
1116                 if (nentries < ch->remote_nentries)
1117                         ch->remote_nentries = nentries;
1118                 spin_unlock_irqrestore(&ch->lock, irq_flags);
1119                 return xpSuccess;
1120         }
1121
1122         return xpNoMemory;
1123 }
1124
1125 /*
1126  * Allocate msg_slots associated with the channel.
1127  */
1128 static enum xp_retval
1129 xpc_setup_msg_structures_uv(struct xpc_channel *ch)
1130 {
1131         static enum xp_retval ret;
1132         struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1133
1134         DBUG_ON(ch->flags & XPC_C_SETUP);
1135
1136         ch_uv->cached_notify_gru_mq_desc = kmalloc(sizeof(struct
1137                                                    gru_message_queue_desc),
1138                                                    GFP_KERNEL);
1139         if (ch_uv->cached_notify_gru_mq_desc == NULL)
1140                 return xpNoMemory;
1141
1142         ret = xpc_allocate_send_msg_slot_uv(ch);
1143         if (ret == xpSuccess) {
1144
1145                 ret = xpc_allocate_recv_msg_slot_uv(ch);
1146                 if (ret != xpSuccess) {
1147                         kfree(ch_uv->send_msg_slots);
1148                         xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1149                 }
1150         }
1151         return ret;
1152 }
1153
1154 /*
1155  * Free up msg_slots and clear other stuff that were setup for the specified
1156  * channel.
1157  */
1158 static void
1159 xpc_teardown_msg_structures_uv(struct xpc_channel *ch)
1160 {
1161         struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1162
1163         DBUG_ON(!spin_is_locked(&ch->lock));
1164
1165         kfree(ch_uv->cached_notify_gru_mq_desc);
1166         ch_uv->cached_notify_gru_mq_desc = NULL;
1167
1168         if (ch->flags & XPC_C_SETUP) {
1169                 xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1170                 kfree(ch_uv->send_msg_slots);
1171                 xpc_init_fifo_uv(&ch_uv->recv_msg_list);
1172                 kfree(ch_uv->recv_msg_slots);
1173         }
1174 }
1175
1176 static void
1177 xpc_send_chctl_closerequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1178 {
1179         struct xpc_activate_mq_msg_chctl_closerequest_uv msg;
1180
1181         msg.ch_number = ch->number;
1182         msg.reason = ch->reason;
1183         xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1184                                     XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV);
1185 }
1186
1187 static void
1188 xpc_send_chctl_closereply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1189 {
1190         struct xpc_activate_mq_msg_chctl_closereply_uv msg;
1191
1192         msg.ch_number = ch->number;
1193         xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1194                                     XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV);
1195 }
1196
1197 static void
1198 xpc_send_chctl_openrequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1199 {
1200         struct xpc_activate_mq_msg_chctl_openrequest_uv msg;
1201
1202         msg.ch_number = ch->number;
1203         msg.entry_size = ch->entry_size;
1204         msg.local_nentries = ch->local_nentries;
1205         xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1206                                     XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV);
1207 }
1208
1209 static void
1210 xpc_send_chctl_openreply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1211 {
1212         struct xpc_activate_mq_msg_chctl_openreply_uv msg;
1213
1214         msg.ch_number = ch->number;
1215         msg.local_nentries = ch->local_nentries;
1216         msg.remote_nentries = ch->remote_nentries;
1217         msg.notify_gru_mq_desc_gpa = uv_gpa(xpc_notify_mq_uv->gru_mq_desc);
1218         xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1219                                     XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV);
1220 }
1221
1222 static void
1223 xpc_send_chctl_opencomplete_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1224 {
1225         struct xpc_activate_mq_msg_chctl_opencomplete_uv msg;
1226
1227         msg.ch_number = ch->number;
1228         xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1229                                     XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV);
1230 }
1231
1232 static void
1233 xpc_send_chctl_local_msgrequest_uv(struct xpc_partition *part, int ch_number)
1234 {
1235         unsigned long irq_flags;
1236
1237         spin_lock_irqsave(&part->chctl_lock, irq_flags);
1238         part->chctl.flags[ch_number] |= XPC_CHCTL_MSGREQUEST;
1239         spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1240
1241         xpc_wakeup_channel_mgr(part);
1242 }
1243
1244 static enum xp_retval
1245 xpc_save_remote_msgqueue_pa_uv(struct xpc_channel *ch,
1246                                unsigned long gru_mq_desc_gpa)
1247 {
1248         struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1249
1250         DBUG_ON(ch_uv->cached_notify_gru_mq_desc == NULL);
1251         return xpc_cache_remote_gru_mq_desc_uv(ch_uv->cached_notify_gru_mq_desc,
1252                                                gru_mq_desc_gpa);
1253 }
1254
1255 static void
1256 xpc_indicate_partition_engaged_uv(struct xpc_partition *part)
1257 {
1258         struct xpc_activate_mq_msg_uv msg;
1259
1260         xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1261                                       XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV);
1262 }
1263
1264 static void
1265 xpc_indicate_partition_disengaged_uv(struct xpc_partition *part)
1266 {
1267         struct xpc_activate_mq_msg_uv msg;
1268
1269         xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1270                                       XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV);
1271 }
1272
1273 static void
1274 xpc_assume_partition_disengaged_uv(short partid)
1275 {
1276         struct xpc_partition_uv *part_uv = &xpc_partitions[partid].sn.uv;
1277         unsigned long irq_flags;
1278
1279         spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
1280         part_uv->flags &= ~XPC_P_ENGAGED_UV;
1281         spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
1282 }
1283
1284 static int
1285 xpc_partition_engaged_uv(short partid)
1286 {
1287         return (xpc_partitions[partid].sn.uv.flags & XPC_P_ENGAGED_UV) != 0;
1288 }
1289
1290 static int
1291 xpc_any_partition_engaged_uv(void)
1292 {
1293         struct xpc_partition_uv *part_uv;
1294         short partid;
1295
1296         for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
1297                 part_uv = &xpc_partitions[partid].sn.uv;
1298                 if ((part_uv->flags & XPC_P_ENGAGED_UV) != 0)
1299                         return 1;
1300         }
1301         return 0;
1302 }
1303
1304 static enum xp_retval
1305 xpc_allocate_msg_slot_uv(struct xpc_channel *ch, u32 flags,
1306                          struct xpc_send_msg_slot_uv **address_of_msg_slot)
1307 {
1308         enum xp_retval ret;
1309         struct xpc_send_msg_slot_uv *msg_slot;
1310         struct xpc_fifo_entry_uv *entry;
1311
1312         while (1) {
1313                 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list);
1314                 if (entry != NULL)
1315                         break;
1316
1317                 if (flags & XPC_NOWAIT)
1318                         return xpNoWait;
1319
1320                 ret = xpc_allocate_msg_wait(ch);
1321                 if (ret != xpInterrupted && ret != xpTimeout)
1322                         return ret;
1323         }
1324
1325         msg_slot = container_of(entry, struct xpc_send_msg_slot_uv, next);
1326         *address_of_msg_slot = msg_slot;
1327         return xpSuccess;
1328 }
1329
1330 static void
1331 xpc_free_msg_slot_uv(struct xpc_channel *ch,
1332                      struct xpc_send_msg_slot_uv *msg_slot)
1333 {
1334         xpc_put_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list, &msg_slot->next);
1335
1336         /* wakeup anyone waiting for a free msg slot */
1337         if (atomic_read(&ch->n_on_msg_allocate_wq) > 0)
1338                 wake_up(&ch->msg_allocate_wq);
1339 }
1340
1341 static void
1342 xpc_notify_sender_uv(struct xpc_channel *ch,
1343                      struct xpc_send_msg_slot_uv *msg_slot,
1344                      enum xp_retval reason)
1345 {
1346         xpc_notify_func func = msg_slot->func;
1347
1348         if (func != NULL && cmpxchg(&msg_slot->func, func, NULL) == func) {
1349
1350                 atomic_dec(&ch->n_to_notify);
1351
1352                 dev_dbg(xpc_chan, "msg_slot->func() called, 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                 func(reason, ch->partid, ch->number, msg_slot->key);
1357
1358                 dev_dbg(xpc_chan, "msg_slot->func() returned, msg_slot=0x%p "
1359                         "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1360                         msg_slot->msg_slot_number, ch->partid, ch->number);
1361         }
1362 }
1363
1364 static void
1365 xpc_handle_notify_mq_ack_uv(struct xpc_channel *ch,
1366                             struct xpc_notify_mq_msg_uv *msg)
1367 {
1368         struct xpc_send_msg_slot_uv *msg_slot;
1369         int entry = msg->hdr.msg_slot_number % ch->local_nentries;
1370
1371         msg_slot = &ch->sn.uv.send_msg_slots[entry];
1372
1373         BUG_ON(msg_slot->msg_slot_number != msg->hdr.msg_slot_number);
1374         msg_slot->msg_slot_number += ch->local_nentries;
1375
1376         if (msg_slot->func != NULL)
1377                 xpc_notify_sender_uv(ch, msg_slot, xpMsgDelivered);
1378
1379         xpc_free_msg_slot_uv(ch, msg_slot);
1380 }
1381
1382 static void
1383 xpc_handle_notify_mq_msg_uv(struct xpc_partition *part,
1384                             struct xpc_notify_mq_msg_uv *msg)
1385 {
1386         struct xpc_partition_uv *part_uv = &part->sn.uv;
1387         struct xpc_channel *ch;
1388         struct xpc_channel_uv *ch_uv;
1389         struct xpc_notify_mq_msg_uv *msg_slot;
1390         unsigned long irq_flags;
1391         int ch_number = msg->hdr.ch_number;
1392
1393         if (unlikely(ch_number >= part->nchannels)) {
1394                 dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received invalid "
1395                         "channel number=0x%x in message from partid=%d\n",
1396                         ch_number, XPC_PARTID(part));
1397
1398                 /* get hb checker to deactivate from the remote partition */
1399                 spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1400                 if (part_uv->act_state_req == 0)
1401                         xpc_activate_IRQ_rcvd++;
1402                 part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
1403                 part_uv->reason = xpBadChannelNumber;
1404                 spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1405
1406                 wake_up_interruptible(&xpc_activate_IRQ_wq);
1407                 return;
1408         }
1409
1410         ch = &part->channels[ch_number];
1411         xpc_msgqueue_ref(ch);
1412
1413         if (!(ch->flags & XPC_C_CONNECTED)) {
1414                 xpc_msgqueue_deref(ch);
1415                 return;
1416         }
1417
1418         /* see if we're really dealing with an ACK for a previously sent msg */
1419         if (msg->hdr.size == 0) {
1420                 xpc_handle_notify_mq_ack_uv(ch, msg);
1421                 xpc_msgqueue_deref(ch);
1422                 return;
1423         }
1424
1425         /* we're dealing with a normal message sent via the notify_mq */
1426         ch_uv = &ch->sn.uv;
1427
1428         msg_slot = ch_uv->recv_msg_slots +
1429             (msg->hdr.msg_slot_number % ch->remote_nentries) * ch->entry_size;
1430
1431         BUG_ON(msg_slot->hdr.size != 0);
1432
1433         memcpy(msg_slot, msg, msg->hdr.size);
1434
1435         xpc_put_fifo_entry_uv(&ch_uv->recv_msg_list, &msg_slot->hdr.u.next);
1436
1437         if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) {
1438                 /*
1439                  * If there is an existing idle kthread get it to deliver
1440                  * the payload, otherwise we'll have to get the channel mgr
1441                  * for this partition to create a kthread to do the delivery.
1442                  */
1443                 if (atomic_read(&ch->kthreads_idle) > 0)
1444                         wake_up_nr(&ch->idle_wq, 1);
1445                 else
1446                         xpc_send_chctl_local_msgrequest_uv(part, ch->number);
1447         }
1448         xpc_msgqueue_deref(ch);
1449 }
1450
1451 static irqreturn_t
1452 xpc_handle_notify_IRQ_uv(int irq, void *dev_id)
1453 {
1454         struct xpc_notify_mq_msg_uv *msg;
1455         short partid;
1456         struct xpc_partition *part;
1457
1458         while ((msg = gru_get_next_message(xpc_notify_mq_uv->gru_mq_desc)) !=
1459                NULL) {
1460
1461                 partid = msg->hdr.partid;
1462                 if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
1463                         dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received "
1464                                 "invalid partid=0x%x in message\n", partid);
1465                 } else {
1466                         part = &xpc_partitions[partid];
1467
1468                         if (xpc_part_ref(part)) {
1469                                 xpc_handle_notify_mq_msg_uv(part, msg);
1470                                 xpc_part_deref(part);
1471                         }
1472                 }
1473
1474                 gru_free_message(xpc_notify_mq_uv->gru_mq_desc, msg);
1475         }
1476
1477         return IRQ_HANDLED;
1478 }
1479
1480 static int
1481 xpc_n_of_deliverable_payloads_uv(struct xpc_channel *ch)
1482 {
1483         return xpc_n_of_fifo_entries_uv(&ch->sn.uv.recv_msg_list);
1484 }
1485
1486 static void
1487 xpc_process_msg_chctl_flags_uv(struct xpc_partition *part, int ch_number)
1488 {
1489         struct xpc_channel *ch = &part->channels[ch_number];
1490         int ndeliverable_payloads;
1491
1492         xpc_msgqueue_ref(ch);
1493
1494         ndeliverable_payloads = xpc_n_of_deliverable_payloads_uv(ch);
1495
1496         if (ndeliverable_payloads > 0 &&
1497             (ch->flags & XPC_C_CONNECTED) &&
1498             (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE)) {
1499
1500                 xpc_activate_kthreads(ch, ndeliverable_payloads);
1501         }
1502
1503         xpc_msgqueue_deref(ch);
1504 }
1505
1506 static enum xp_retval
1507 xpc_send_payload_uv(struct xpc_channel *ch, u32 flags, void *payload,
1508                     u16 payload_size, u8 notify_type, xpc_notify_func func,
1509                     void *key)
1510 {
1511         enum xp_retval ret = xpSuccess;
1512         struct xpc_send_msg_slot_uv *msg_slot = NULL;
1513         struct xpc_notify_mq_msg_uv *msg;
1514         u8 msg_buffer[XPC_NOTIFY_MSG_SIZE_UV];
1515         size_t msg_size;
1516
1517         DBUG_ON(notify_type != XPC_N_CALL);
1518
1519         msg_size = sizeof(struct xpc_notify_mq_msghdr_uv) + payload_size;
1520         if (msg_size > ch->entry_size)
1521                 return xpPayloadTooBig;
1522
1523         xpc_msgqueue_ref(ch);
1524
1525         if (ch->flags & XPC_C_DISCONNECTING) {
1526                 ret = ch->reason;
1527                 goto out_1;
1528         }
1529         if (!(ch->flags & XPC_C_CONNECTED)) {
1530                 ret = xpNotConnected;
1531                 goto out_1;
1532         }
1533
1534         ret = xpc_allocate_msg_slot_uv(ch, flags, &msg_slot);
1535         if (ret != xpSuccess)
1536                 goto out_1;
1537
1538         if (func != NULL) {
1539                 atomic_inc(&ch->n_to_notify);
1540
1541                 msg_slot->key = key;
1542                 smp_wmb(); /* a non-NULL func must hit memory after the key */
1543                 msg_slot->func = func;
1544
1545                 if (ch->flags & XPC_C_DISCONNECTING) {
1546                         ret = ch->reason;
1547                         goto out_2;
1548                 }
1549         }
1550
1551         msg = (struct xpc_notify_mq_msg_uv *)&msg_buffer;
1552         msg->hdr.partid = xp_partition_id;
1553         msg->hdr.ch_number = ch->number;
1554         msg->hdr.size = msg_size;
1555         msg->hdr.msg_slot_number = msg_slot->msg_slot_number;
1556         memcpy(&msg->payload, payload, payload_size);
1557
1558         ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1559                                msg_size);
1560         if (ret == xpSuccess)
1561                 goto out_1;
1562
1563         XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1564 out_2:
1565         if (func != NULL) {
1566                 /*
1567                  * Try to NULL the msg_slot's func field. If we fail, then
1568                  * xpc_notify_senders_of_disconnect_uv() beat us to it, in which
1569                  * case we need to pretend we succeeded to send the message
1570                  * since the user will get a callout for the disconnect error
1571                  * by xpc_notify_senders_of_disconnect_uv(), and to also get an
1572                  * error returned here will confuse them. Additionally, since
1573                  * in this case the channel is being disconnected we don't need
1574                  * to put the the msg_slot back on the free list.
1575                  */
1576                 if (cmpxchg(&msg_slot->func, func, NULL) != func) {
1577                         ret = xpSuccess;
1578                         goto out_1;
1579                 }
1580
1581                 msg_slot->key = NULL;
1582                 atomic_dec(&ch->n_to_notify);
1583         }
1584         xpc_free_msg_slot_uv(ch, msg_slot);
1585 out_1:
1586         xpc_msgqueue_deref(ch);
1587         return ret;
1588 }
1589
1590 /*
1591  * Tell the callers of xpc_send_notify() that the status of their payloads
1592  * is unknown because the channel is now disconnecting.
1593  *
1594  * We don't worry about putting these msg_slots on the free list since the
1595  * msg_slots themselves are about to be kfree'd.
1596  */
1597 static void
1598 xpc_notify_senders_of_disconnect_uv(struct xpc_channel *ch)
1599 {
1600         struct xpc_send_msg_slot_uv *msg_slot;
1601         int entry;
1602
1603         DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING));
1604
1605         for (entry = 0; entry < ch->local_nentries; entry++) {
1606
1607                 if (atomic_read(&ch->n_to_notify) == 0)
1608                         break;
1609
1610                 msg_slot = &ch->sn.uv.send_msg_slots[entry];
1611                 if (msg_slot->func != NULL)
1612                         xpc_notify_sender_uv(ch, msg_slot, ch->reason);
1613         }
1614 }
1615
1616 /*
1617  * Get the next deliverable message's payload.
1618  */
1619 static void *
1620 xpc_get_deliverable_payload_uv(struct xpc_channel *ch)
1621 {
1622         struct xpc_fifo_entry_uv *entry;
1623         struct xpc_notify_mq_msg_uv *msg;
1624         void *payload = NULL;
1625
1626         if (!(ch->flags & XPC_C_DISCONNECTING)) {
1627                 entry = xpc_get_fifo_entry_uv(&ch->sn.uv.recv_msg_list);
1628                 if (entry != NULL) {
1629                         msg = container_of(entry, struct xpc_notify_mq_msg_uv,
1630                                            hdr.u.next);
1631                         payload = &msg->payload;
1632                 }
1633         }
1634         return payload;
1635 }
1636
1637 static void
1638 xpc_received_payload_uv(struct xpc_channel *ch, void *payload)
1639 {
1640         struct xpc_notify_mq_msg_uv *msg;
1641         enum xp_retval ret;
1642
1643         msg = container_of(payload, struct xpc_notify_mq_msg_uv, payload);
1644
1645         /* return an ACK to the sender of this message */
1646
1647         msg->hdr.partid = xp_partition_id;
1648         msg->hdr.size = 0;      /* size of zero indicates this is an ACK */
1649
1650         ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1651                                sizeof(struct xpc_notify_mq_msghdr_uv));
1652         if (ret != xpSuccess)
1653                 XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1654 }
1655
1656 static struct xpc_arch_operations xpc_arch_ops_uv = {
1657         .setup_partitions = xpc_setup_partitions_uv,
1658         .teardown_partitions = xpc_teardown_partitions_uv,
1659         .process_activate_IRQ_rcvd = xpc_process_activate_IRQ_rcvd_uv,
1660         .get_partition_rsvd_page_pa = xpc_get_partition_rsvd_page_pa_uv,
1661         .setup_rsvd_page = xpc_setup_rsvd_page_uv,
1662
1663         .allow_hb = xpc_allow_hb_uv,
1664         .disallow_hb = xpc_disallow_hb_uv,
1665         .disallow_all_hbs = xpc_disallow_all_hbs_uv,
1666         .increment_heartbeat = xpc_increment_heartbeat_uv,
1667         .offline_heartbeat = xpc_offline_heartbeat_uv,
1668         .online_heartbeat = xpc_online_heartbeat_uv,
1669         .heartbeat_init = xpc_heartbeat_init_uv,
1670         .heartbeat_exit = xpc_heartbeat_exit_uv,
1671         .get_remote_heartbeat = xpc_get_remote_heartbeat_uv,
1672
1673         .request_partition_activation =
1674                 xpc_request_partition_activation_uv,
1675         .request_partition_reactivation =
1676                 xpc_request_partition_reactivation_uv,
1677         .request_partition_deactivation =
1678                 xpc_request_partition_deactivation_uv,
1679         .cancel_partition_deactivation_request =
1680                 xpc_cancel_partition_deactivation_request_uv,
1681
1682         .setup_ch_structures = xpc_setup_ch_structures_uv,
1683         .teardown_ch_structures = xpc_teardown_ch_structures_uv,
1684
1685         .make_first_contact = xpc_make_first_contact_uv,
1686
1687         .get_chctl_all_flags = xpc_get_chctl_all_flags_uv,
1688         .send_chctl_closerequest = xpc_send_chctl_closerequest_uv,
1689         .send_chctl_closereply = xpc_send_chctl_closereply_uv,
1690         .send_chctl_openrequest = xpc_send_chctl_openrequest_uv,
1691         .send_chctl_openreply = xpc_send_chctl_openreply_uv,
1692         .send_chctl_opencomplete = xpc_send_chctl_opencomplete_uv,
1693         .process_msg_chctl_flags = xpc_process_msg_chctl_flags_uv,
1694
1695         .save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_uv,
1696
1697         .setup_msg_structures = xpc_setup_msg_structures_uv,
1698         .teardown_msg_structures = xpc_teardown_msg_structures_uv,
1699
1700         .indicate_partition_engaged = xpc_indicate_partition_engaged_uv,
1701         .indicate_partition_disengaged = xpc_indicate_partition_disengaged_uv,
1702         .assume_partition_disengaged = xpc_assume_partition_disengaged_uv,
1703         .partition_engaged = xpc_partition_engaged_uv,
1704         .any_partition_engaged = xpc_any_partition_engaged_uv,
1705
1706         .n_of_deliverable_payloads = xpc_n_of_deliverable_payloads_uv,
1707         .send_payload = xpc_send_payload_uv,
1708         .get_deliverable_payload = xpc_get_deliverable_payload_uv,
1709         .received_payload = xpc_received_payload_uv,
1710         .notify_senders_of_disconnect = xpc_notify_senders_of_disconnect_uv,
1711 };
1712
1713 int
1714 xpc_init_uv(void)
1715 {
1716         xpc_arch_ops = xpc_arch_ops_uv;
1717
1718         if (sizeof(struct xpc_notify_mq_msghdr_uv) > XPC_MSG_HDR_MAX_SIZE) {
1719                 dev_err(xpc_part, "xpc_notify_mq_msghdr_uv is larger than %d\n",
1720                         XPC_MSG_HDR_MAX_SIZE);
1721                 return -E2BIG;
1722         }
1723
1724         xpc_activate_mq_uv = xpc_create_gru_mq_uv(XPC_ACTIVATE_MQ_SIZE_UV, 0,
1725                                                   XPC_ACTIVATE_IRQ_NAME,
1726                                                   xpc_handle_activate_IRQ_uv);
1727         if (IS_ERR(xpc_activate_mq_uv))
1728                 return PTR_ERR(xpc_activate_mq_uv);
1729
1730         xpc_notify_mq_uv = xpc_create_gru_mq_uv(XPC_NOTIFY_MQ_SIZE_UV, 0,
1731                                                 XPC_NOTIFY_IRQ_NAME,
1732                                                 xpc_handle_notify_IRQ_uv);
1733         if (IS_ERR(xpc_notify_mq_uv)) {
1734                 xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1735                 return PTR_ERR(xpc_notify_mq_uv);
1736         }
1737
1738         return 0;
1739 }
1740
1741 void
1742 xpc_exit_uv(void)
1743 {
1744         xpc_destroy_gru_mq_uv(xpc_notify_mq_uv);
1745         xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1746 }