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0001 /*
0002  * This file is subject to the terms and conditions of the GNU General Public
0003  * License.  See the file "COPYING" in the main directory of this archive
0004  * for more details.
0005  *
0006  * Copyright (c) 2008-2009 Silicon Graphics, Inc.  All Rights Reserved.
0007  */
0008 
0009 /*
0010  * Cross Partition Communication (XPC) uv-based functions.
0011  *
0012  *     Architecture specific implementation of common functions.
0013  *
0014  */
0015 
0016 #include <linux/kernel.h>
0017 #include <linux/mm.h>
0018 #include <linux/interrupt.h>
0019 #include <linux/delay.h>
0020 #include <linux/device.h>
0021 #include <linux/cpu.h>
0022 #include <linux/module.h>
0023 #include <linux/err.h>
0024 #include <linux/slab.h>
0025 #include <linux/numa.h>
0026 #include <asm/uv/uv_hub.h>
0027 #if defined CONFIG_X86_64
0028 #include <asm/uv/bios.h>
0029 #include <asm/uv/uv_irq.h>
0030 #elif defined CONFIG_IA64_SGI_UV
0031 #include <asm/sn/intr.h>
0032 #include <asm/sn/sn_sal.h>
0033 #endif
0034 #include "../sgi-gru/gru.h"
0035 #include "../sgi-gru/grukservices.h"
0036 #include "xpc.h"
0037 
0038 #if defined CONFIG_IA64_SGI_UV
0039 struct uv_IO_APIC_route_entry {
0040     __u64   vector      :  8,
0041         delivery_mode   :  3,
0042         dest_mode   :  1,
0043         delivery_status :  1,
0044         polarity    :  1,
0045         __reserved_1    :  1,
0046         trigger     :  1,
0047         mask        :  1,
0048         __reserved_2    : 15,
0049         dest        : 32;
0050 };
0051 
0052 #define sn_partition_id 0
0053 #endif
0054 
0055 static struct xpc_heartbeat_uv *xpc_heartbeat_uv;
0056 
0057 #define XPC_ACTIVATE_MSG_SIZE_UV    (1 * GRU_CACHE_LINE_BYTES)
0058 #define XPC_ACTIVATE_MQ_SIZE_UV     (4 * XP_MAX_NPARTITIONS_UV * \
0059                      XPC_ACTIVATE_MSG_SIZE_UV)
0060 #define XPC_ACTIVATE_IRQ_NAME       "xpc_activate"
0061 
0062 #define XPC_NOTIFY_MSG_SIZE_UV      (2 * GRU_CACHE_LINE_BYTES)
0063 #define XPC_NOTIFY_MQ_SIZE_UV       (4 * XP_MAX_NPARTITIONS_UV * \
0064                      XPC_NOTIFY_MSG_SIZE_UV)
0065 #define XPC_NOTIFY_IRQ_NAME     "xpc_notify"
0066 
0067 static int xpc_mq_node = NUMA_NO_NODE;
0068 
0069 static struct xpc_gru_mq_uv *xpc_activate_mq_uv;
0070 static struct xpc_gru_mq_uv *xpc_notify_mq_uv;
0071 
0072 static int
0073 xpc_setup_partitions_uv(void)
0074 {
0075     short partid;
0076     struct xpc_partition_uv *part_uv;
0077 
0078     for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
0079         part_uv = &xpc_partitions[partid].sn.uv;
0080 
0081         mutex_init(&part_uv->cached_activate_gru_mq_desc_mutex);
0082         spin_lock_init(&part_uv->flags_lock);
0083         part_uv->remote_act_state = XPC_P_AS_INACTIVE;
0084     }
0085     return 0;
0086 }
0087 
0088 static void
0089 xpc_teardown_partitions_uv(void)
0090 {
0091     short partid;
0092     struct xpc_partition_uv *part_uv;
0093     unsigned long irq_flags;
0094 
0095     for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
0096         part_uv = &xpc_partitions[partid].sn.uv;
0097 
0098         if (part_uv->cached_activate_gru_mq_desc != NULL) {
0099             mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
0100             spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
0101             part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
0102             spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
0103             kfree(part_uv->cached_activate_gru_mq_desc);
0104             part_uv->cached_activate_gru_mq_desc = NULL;
0105             mutex_unlock(&part_uv->
0106                      cached_activate_gru_mq_desc_mutex);
0107         }
0108     }
0109 }
0110 
0111 static int
0112 xpc_get_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq, int cpu, char *irq_name)
0113 {
0114     int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
0115 
0116 #if defined CONFIG_X86_64
0117     mq->irq = uv_setup_irq(irq_name, cpu, mq->mmr_blade, mq->mmr_offset,
0118             UV_AFFINITY_CPU);
0119     if (mq->irq < 0)
0120         return mq->irq;
0121 
0122     mq->mmr_value = uv_read_global_mmr64(mmr_pnode, mq->mmr_offset);
0123 
0124 #elif defined CONFIG_IA64_SGI_UV
0125     if (strcmp(irq_name, XPC_ACTIVATE_IRQ_NAME) == 0)
0126         mq->irq = SGI_XPC_ACTIVATE;
0127     else if (strcmp(irq_name, XPC_NOTIFY_IRQ_NAME) == 0)
0128         mq->irq = SGI_XPC_NOTIFY;
0129     else
0130         return -EINVAL;
0131 
0132     mq->mmr_value = (unsigned long)cpu_physical_id(cpu) << 32 | mq->irq;
0133     uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mq->mmr_value);
0134 #else
0135     #error not a supported configuration
0136 #endif
0137 
0138     return 0;
0139 }
0140 
0141 static void
0142 xpc_release_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq)
0143 {
0144 #if defined CONFIG_X86_64
0145     uv_teardown_irq(mq->irq);
0146 
0147 #elif defined CONFIG_IA64_SGI_UV
0148     int mmr_pnode;
0149     unsigned long mmr_value;
0150 
0151     mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
0152     mmr_value = 1UL << 16;
0153 
0154     uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mmr_value);
0155 #else
0156     #error not a supported configuration
0157 #endif
0158 }
0159 
0160 static int
0161 xpc_gru_mq_watchlist_alloc_uv(struct xpc_gru_mq_uv *mq)
0162 {
0163     int ret;
0164 
0165 #if defined CONFIG_IA64_SGI_UV
0166     int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
0167 
0168     ret = sn_mq_watchlist_alloc(mmr_pnode, (void *)uv_gpa(mq->address),
0169                     mq->order, &mq->mmr_offset);
0170     if (ret < 0) {
0171         dev_err(xpc_part, "sn_mq_watchlist_alloc() failed, ret=%d\n",
0172             ret);
0173         return -EBUSY;
0174     }
0175 #elif defined CONFIG_X86_64
0176     ret = uv_bios_mq_watchlist_alloc(uv_gpa(mq->address),
0177                      mq->order, &mq->mmr_offset);
0178     if (ret < 0) {
0179         dev_err(xpc_part, "uv_bios_mq_watchlist_alloc() failed, "
0180             "ret=%d\n", ret);
0181         return ret;
0182     }
0183 #else
0184     #error not a supported configuration
0185 #endif
0186 
0187     mq->watchlist_num = ret;
0188     return 0;
0189 }
0190 
0191 static void
0192 xpc_gru_mq_watchlist_free_uv(struct xpc_gru_mq_uv *mq)
0193 {
0194     int ret;
0195     int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
0196 
0197 #if defined CONFIG_X86_64
0198     ret = uv_bios_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
0199     BUG_ON(ret != BIOS_STATUS_SUCCESS);
0200 #elif defined CONFIG_IA64_SGI_UV
0201     ret = sn_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
0202     BUG_ON(ret != SALRET_OK);
0203 #else
0204     #error not a supported configuration
0205 #endif
0206 }
0207 
0208 static struct xpc_gru_mq_uv *
0209 xpc_create_gru_mq_uv(unsigned int mq_size, int cpu, char *irq_name,
0210              irq_handler_t irq_handler)
0211 {
0212     enum xp_retval xp_ret;
0213     int ret;
0214     int nid;
0215     int nasid;
0216     int pg_order;
0217     struct page *page;
0218     struct xpc_gru_mq_uv *mq;
0219     struct uv_IO_APIC_route_entry *mmr_value;
0220 
0221     mq = kmalloc(sizeof(struct xpc_gru_mq_uv), GFP_KERNEL);
0222     if (mq == NULL) {
0223         dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
0224             "a xpc_gru_mq_uv structure\n");
0225         ret = -ENOMEM;
0226         goto out_0;
0227     }
0228 
0229     mq->gru_mq_desc = kzalloc(sizeof(struct gru_message_queue_desc),
0230                   GFP_KERNEL);
0231     if (mq->gru_mq_desc == NULL) {
0232         dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
0233             "a gru_message_queue_desc structure\n");
0234         ret = -ENOMEM;
0235         goto out_1;
0236     }
0237 
0238     pg_order = get_order(mq_size);
0239     mq->order = pg_order + PAGE_SHIFT;
0240     mq_size = 1UL << mq->order;
0241 
0242     mq->mmr_blade = uv_cpu_to_blade_id(cpu);
0243 
0244     nid = cpu_to_node(cpu);
0245     page = __alloc_pages_node(nid,
0246                       GFP_KERNEL | __GFP_ZERO | __GFP_THISNODE,
0247                       pg_order);
0248     if (page == NULL) {
0249         dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to alloc %d "
0250             "bytes of memory on nid=%d for GRU mq\n", mq_size, nid);
0251         ret = -ENOMEM;
0252         goto out_2;
0253     }
0254     mq->address = page_address(page);
0255 
0256     /* enable generation of irq when GRU mq operation occurs to this mq */
0257     ret = xpc_gru_mq_watchlist_alloc_uv(mq);
0258     if (ret != 0)
0259         goto out_3;
0260 
0261     ret = xpc_get_gru_mq_irq_uv(mq, cpu, irq_name);
0262     if (ret != 0)
0263         goto out_4;
0264 
0265     ret = request_irq(mq->irq, irq_handler, 0, irq_name, NULL);
0266     if (ret != 0) {
0267         dev_err(xpc_part, "request_irq(irq=%d) returned error=%d\n",
0268             mq->irq, -ret);
0269         goto out_5;
0270     }
0271 
0272     nasid = UV_PNODE_TO_NASID(uv_cpu_to_pnode(cpu));
0273 
0274     mmr_value = (struct uv_IO_APIC_route_entry *)&mq->mmr_value;
0275     ret = gru_create_message_queue(mq->gru_mq_desc, mq->address, mq_size,
0276                      nasid, mmr_value->vector, mmr_value->dest);
0277     if (ret != 0) {
0278         dev_err(xpc_part, "gru_create_message_queue() returned "
0279             "error=%d\n", ret);
0280         ret = -EINVAL;
0281         goto out_6;
0282     }
0283 
0284     /* allow other partitions to access this GRU mq */
0285     xp_ret = xp_expand_memprotect(xp_pa(mq->address), mq_size);
0286     if (xp_ret != xpSuccess) {
0287         ret = -EACCES;
0288         goto out_6;
0289     }
0290 
0291     return mq;
0292 
0293     /* something went wrong */
0294 out_6:
0295     free_irq(mq->irq, NULL);
0296 out_5:
0297     xpc_release_gru_mq_irq_uv(mq);
0298 out_4:
0299     xpc_gru_mq_watchlist_free_uv(mq);
0300 out_3:
0301     free_pages((unsigned long)mq->address, pg_order);
0302 out_2:
0303     kfree(mq->gru_mq_desc);
0304 out_1:
0305     kfree(mq);
0306 out_0:
0307     return ERR_PTR(ret);
0308 }
0309 
0310 static void
0311 xpc_destroy_gru_mq_uv(struct xpc_gru_mq_uv *mq)
0312 {
0313     unsigned int mq_size;
0314     int pg_order;
0315     int ret;
0316 
0317     /* disallow other partitions to access GRU mq */
0318     mq_size = 1UL << mq->order;
0319     ret = xp_restrict_memprotect(xp_pa(mq->address), mq_size);
0320     BUG_ON(ret != xpSuccess);
0321 
0322     /* unregister irq handler and release mq irq/vector mapping */
0323     free_irq(mq->irq, NULL);
0324     xpc_release_gru_mq_irq_uv(mq);
0325 
0326     /* disable generation of irq when GRU mq op occurs to this mq */
0327     xpc_gru_mq_watchlist_free_uv(mq);
0328 
0329     pg_order = mq->order - PAGE_SHIFT;
0330     free_pages((unsigned long)mq->address, pg_order);
0331 
0332     kfree(mq);
0333 }
0334 
0335 static enum xp_retval
0336 xpc_send_gru_msg(struct gru_message_queue_desc *gru_mq_desc, void *msg,
0337          size_t msg_size)
0338 {
0339     enum xp_retval xp_ret;
0340     int ret;
0341 
0342     while (1) {
0343         ret = gru_send_message_gpa(gru_mq_desc, msg, msg_size);
0344         if (ret == MQE_OK) {
0345             xp_ret = xpSuccess;
0346             break;
0347         }
0348 
0349         if (ret == MQE_QUEUE_FULL) {
0350             dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
0351                 "error=MQE_QUEUE_FULL\n");
0352             /* !!! handle QLimit reached; delay & try again */
0353             /* ??? Do we add a limit to the number of retries? */
0354             (void)msleep_interruptible(10);
0355         } else if (ret == MQE_CONGESTION) {
0356             dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
0357                 "error=MQE_CONGESTION\n");
0358             /* !!! handle LB Overflow; simply try again */
0359             /* ??? Do we add a limit to the number of retries? */
0360         } else {
0361             /* !!! Currently this is MQE_UNEXPECTED_CB_ERR */
0362             dev_err(xpc_chan, "gru_send_message_gpa() returned "
0363                 "error=%d\n", ret);
0364             xp_ret = xpGruSendMqError;
0365             break;
0366         }
0367     }
0368     return xp_ret;
0369 }
0370 
0371 static void
0372 xpc_process_activate_IRQ_rcvd_uv(void)
0373 {
0374     unsigned long irq_flags;
0375     short partid;
0376     struct xpc_partition *part;
0377     u8 act_state_req;
0378 
0379     DBUG_ON(xpc_activate_IRQ_rcvd == 0);
0380 
0381     spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
0382     for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
0383         part = &xpc_partitions[partid];
0384 
0385         if (part->sn.uv.act_state_req == 0)
0386             continue;
0387 
0388         xpc_activate_IRQ_rcvd--;
0389         BUG_ON(xpc_activate_IRQ_rcvd < 0);
0390 
0391         act_state_req = part->sn.uv.act_state_req;
0392         part->sn.uv.act_state_req = 0;
0393         spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
0394 
0395         if (act_state_req == XPC_P_ASR_ACTIVATE_UV) {
0396             if (part->act_state == XPC_P_AS_INACTIVE)
0397                 xpc_activate_partition(part);
0398             else if (part->act_state == XPC_P_AS_DEACTIVATING)
0399                 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
0400 
0401         } else if (act_state_req == XPC_P_ASR_REACTIVATE_UV) {
0402             if (part->act_state == XPC_P_AS_INACTIVE)
0403                 xpc_activate_partition(part);
0404             else
0405                 XPC_DEACTIVATE_PARTITION(part, xpReactivating);
0406 
0407         } else if (act_state_req == XPC_P_ASR_DEACTIVATE_UV) {
0408             XPC_DEACTIVATE_PARTITION(part, part->sn.uv.reason);
0409 
0410         } else {
0411             BUG();
0412         }
0413 
0414         spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
0415         if (xpc_activate_IRQ_rcvd == 0)
0416             break;
0417     }
0418     spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
0419 
0420 }
0421 
0422 static void
0423 xpc_handle_activate_mq_msg_uv(struct xpc_partition *part,
0424                   struct xpc_activate_mq_msghdr_uv *msg_hdr,
0425                   int part_setup,
0426                   int *wakeup_hb_checker)
0427 {
0428     unsigned long irq_flags;
0429     struct xpc_partition_uv *part_uv = &part->sn.uv;
0430     struct xpc_openclose_args *args;
0431 
0432     part_uv->remote_act_state = msg_hdr->act_state;
0433 
0434     switch (msg_hdr->type) {
0435     case XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV:
0436         /* syncing of remote_act_state was just done above */
0437         break;
0438 
0439     case XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV: {
0440         struct xpc_activate_mq_msg_activate_req_uv *msg;
0441 
0442         /*
0443          * ??? Do we deal here with ts_jiffies being different
0444          * ??? if act_state != XPC_P_AS_INACTIVE instead of
0445          * ??? below?
0446          */
0447         msg = container_of(msg_hdr, struct
0448                    xpc_activate_mq_msg_activate_req_uv, hdr);
0449 
0450         spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
0451         if (part_uv->act_state_req == 0)
0452             xpc_activate_IRQ_rcvd++;
0453         part_uv->act_state_req = XPC_P_ASR_ACTIVATE_UV;
0454         part->remote_rp_pa = msg->rp_gpa; /* !!! _pa is _gpa */
0455         part->remote_rp_ts_jiffies = msg_hdr->rp_ts_jiffies;
0456         part_uv->heartbeat_gpa = msg->heartbeat_gpa;
0457 
0458         if (msg->activate_gru_mq_desc_gpa !=
0459             part_uv->activate_gru_mq_desc_gpa) {
0460             spin_lock(&part_uv->flags_lock);
0461             part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
0462             spin_unlock(&part_uv->flags_lock);
0463             part_uv->activate_gru_mq_desc_gpa =
0464                 msg->activate_gru_mq_desc_gpa;
0465         }
0466         spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
0467 
0468         (*wakeup_hb_checker)++;
0469         break;
0470     }
0471     case XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV: {
0472         struct xpc_activate_mq_msg_deactivate_req_uv *msg;
0473 
0474         msg = container_of(msg_hdr, struct
0475                    xpc_activate_mq_msg_deactivate_req_uv, hdr);
0476 
0477         spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
0478         if (part_uv->act_state_req == 0)
0479             xpc_activate_IRQ_rcvd++;
0480         part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
0481         part_uv->reason = msg->reason;
0482         spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
0483 
0484         (*wakeup_hb_checker)++;
0485         return;
0486     }
0487     case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV: {
0488         struct xpc_activate_mq_msg_chctl_closerequest_uv *msg;
0489 
0490         if (!part_setup)
0491             break;
0492 
0493         msg = container_of(msg_hdr, struct
0494                    xpc_activate_mq_msg_chctl_closerequest_uv,
0495                    hdr);
0496         args = &part->remote_openclose_args[msg->ch_number];
0497         args->reason = msg->reason;
0498 
0499         spin_lock_irqsave(&part->chctl_lock, irq_flags);
0500         part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREQUEST;
0501         spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
0502 
0503         xpc_wakeup_channel_mgr(part);
0504         break;
0505     }
0506     case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV: {
0507         struct xpc_activate_mq_msg_chctl_closereply_uv *msg;
0508 
0509         if (!part_setup)
0510             break;
0511 
0512         msg = container_of(msg_hdr, struct
0513                    xpc_activate_mq_msg_chctl_closereply_uv,
0514                    hdr);
0515 
0516         spin_lock_irqsave(&part->chctl_lock, irq_flags);
0517         part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREPLY;
0518         spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
0519 
0520         xpc_wakeup_channel_mgr(part);
0521         break;
0522     }
0523     case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV: {
0524         struct xpc_activate_mq_msg_chctl_openrequest_uv *msg;
0525 
0526         if (!part_setup)
0527             break;
0528 
0529         msg = container_of(msg_hdr, struct
0530                    xpc_activate_mq_msg_chctl_openrequest_uv,
0531                    hdr);
0532         args = &part->remote_openclose_args[msg->ch_number];
0533         args->entry_size = msg->entry_size;
0534         args->local_nentries = msg->local_nentries;
0535 
0536         spin_lock_irqsave(&part->chctl_lock, irq_flags);
0537         part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREQUEST;
0538         spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
0539 
0540         xpc_wakeup_channel_mgr(part);
0541         break;
0542     }
0543     case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV: {
0544         struct xpc_activate_mq_msg_chctl_openreply_uv *msg;
0545 
0546         if (!part_setup)
0547             break;
0548 
0549         msg = container_of(msg_hdr, struct
0550                    xpc_activate_mq_msg_chctl_openreply_uv, hdr);
0551         args = &part->remote_openclose_args[msg->ch_number];
0552         args->remote_nentries = msg->remote_nentries;
0553         args->local_nentries = msg->local_nentries;
0554         args->local_msgqueue_pa = msg->notify_gru_mq_desc_gpa;
0555 
0556         spin_lock_irqsave(&part->chctl_lock, irq_flags);
0557         part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREPLY;
0558         spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
0559 
0560         xpc_wakeup_channel_mgr(part);
0561         break;
0562     }
0563     case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV: {
0564         struct xpc_activate_mq_msg_chctl_opencomplete_uv *msg;
0565 
0566         if (!part_setup)
0567             break;
0568 
0569         msg = container_of(msg_hdr, struct
0570                 xpc_activate_mq_msg_chctl_opencomplete_uv, hdr);
0571         spin_lock_irqsave(&part->chctl_lock, irq_flags);
0572         part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENCOMPLETE;
0573         spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
0574 
0575         xpc_wakeup_channel_mgr(part);
0576     }
0577         fallthrough;
0578     case XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV:
0579         spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
0580         part_uv->flags |= XPC_P_ENGAGED_UV;
0581         spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
0582         break;
0583 
0584     case XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV:
0585         spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
0586         part_uv->flags &= ~XPC_P_ENGAGED_UV;
0587         spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
0588         break;
0589 
0590     default:
0591         dev_err(xpc_part, "received unknown activate_mq msg type=%d "
0592             "from partition=%d\n", msg_hdr->type, XPC_PARTID(part));
0593 
0594         /* get hb checker to deactivate from the remote partition */
0595         spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
0596         if (part_uv->act_state_req == 0)
0597             xpc_activate_IRQ_rcvd++;
0598         part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
0599         part_uv->reason = xpBadMsgType;
0600         spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
0601 
0602         (*wakeup_hb_checker)++;
0603         return;
0604     }
0605 
0606     if (msg_hdr->rp_ts_jiffies != part->remote_rp_ts_jiffies &&
0607         part->remote_rp_ts_jiffies != 0) {
0608         /*
0609          * ??? Does what we do here need to be sensitive to
0610          * ??? act_state or remote_act_state?
0611          */
0612         spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
0613         if (part_uv->act_state_req == 0)
0614             xpc_activate_IRQ_rcvd++;
0615         part_uv->act_state_req = XPC_P_ASR_REACTIVATE_UV;
0616         spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
0617 
0618         (*wakeup_hb_checker)++;
0619     }
0620 }
0621 
0622 static irqreturn_t
0623 xpc_handle_activate_IRQ_uv(int irq, void *dev_id)
0624 {
0625     struct xpc_activate_mq_msghdr_uv *msg_hdr;
0626     short partid;
0627     struct xpc_partition *part;
0628     int wakeup_hb_checker = 0;
0629     int part_referenced;
0630 
0631     while (1) {
0632         msg_hdr = gru_get_next_message(xpc_activate_mq_uv->gru_mq_desc);
0633         if (msg_hdr == NULL)
0634             break;
0635 
0636         partid = msg_hdr->partid;
0637         if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
0638             dev_err(xpc_part, "xpc_handle_activate_IRQ_uv() "
0639                 "received invalid partid=0x%x in message\n",
0640                 partid);
0641         } else {
0642             part = &xpc_partitions[partid];
0643 
0644             part_referenced = xpc_part_ref(part);
0645             xpc_handle_activate_mq_msg_uv(part, msg_hdr,
0646                               part_referenced,
0647                               &wakeup_hb_checker);
0648             if (part_referenced)
0649                 xpc_part_deref(part);
0650         }
0651 
0652         gru_free_message(xpc_activate_mq_uv->gru_mq_desc, msg_hdr);
0653     }
0654 
0655     if (wakeup_hb_checker)
0656         wake_up_interruptible(&xpc_activate_IRQ_wq);
0657 
0658     return IRQ_HANDLED;
0659 }
0660 
0661 static enum xp_retval
0662 xpc_cache_remote_gru_mq_desc_uv(struct gru_message_queue_desc *gru_mq_desc,
0663                 unsigned long gru_mq_desc_gpa)
0664 {
0665     enum xp_retval ret;
0666 
0667     ret = xp_remote_memcpy(uv_gpa(gru_mq_desc), gru_mq_desc_gpa,
0668                    sizeof(struct gru_message_queue_desc));
0669     if (ret == xpSuccess)
0670         gru_mq_desc->mq = NULL;
0671 
0672     return ret;
0673 }
0674 
0675 static enum xp_retval
0676 xpc_send_activate_IRQ_uv(struct xpc_partition *part, void *msg, size_t msg_size,
0677              int msg_type)
0678 {
0679     struct xpc_activate_mq_msghdr_uv *msg_hdr = msg;
0680     struct xpc_partition_uv *part_uv = &part->sn.uv;
0681     struct gru_message_queue_desc *gru_mq_desc;
0682     unsigned long irq_flags;
0683     enum xp_retval ret;
0684 
0685     DBUG_ON(msg_size > XPC_ACTIVATE_MSG_SIZE_UV);
0686 
0687     msg_hdr->type = msg_type;
0688     msg_hdr->partid = xp_partition_id;
0689     msg_hdr->act_state = part->act_state;
0690     msg_hdr->rp_ts_jiffies = xpc_rsvd_page->ts_jiffies;
0691 
0692     mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
0693 again:
0694     if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV)) {
0695         gru_mq_desc = part_uv->cached_activate_gru_mq_desc;
0696         if (gru_mq_desc == NULL) {
0697             gru_mq_desc = kmalloc(sizeof(struct
0698                           gru_message_queue_desc),
0699                           GFP_ATOMIC);
0700             if (gru_mq_desc == NULL) {
0701                 ret = xpNoMemory;
0702                 goto done;
0703             }
0704             part_uv->cached_activate_gru_mq_desc = gru_mq_desc;
0705         }
0706 
0707         ret = xpc_cache_remote_gru_mq_desc_uv(gru_mq_desc,
0708                               part_uv->
0709                               activate_gru_mq_desc_gpa);
0710         if (ret != xpSuccess)
0711             goto done;
0712 
0713         spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
0714         part_uv->flags |= XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
0715         spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
0716     }
0717 
0718     /* ??? Is holding a spin_lock (ch->lock) during this call a bad idea? */
0719     ret = xpc_send_gru_msg(part_uv->cached_activate_gru_mq_desc, msg,
0720                    msg_size);
0721     if (ret != xpSuccess) {
0722         smp_rmb();  /* ensure a fresh copy of part_uv->flags */
0723         if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV))
0724             goto again;
0725     }
0726 done:
0727     mutex_unlock(&part_uv->cached_activate_gru_mq_desc_mutex);
0728     return ret;
0729 }
0730 
0731 static void
0732 xpc_send_activate_IRQ_part_uv(struct xpc_partition *part, void *msg,
0733                   size_t msg_size, int msg_type)
0734 {
0735     enum xp_retval ret;
0736 
0737     ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
0738     if (unlikely(ret != xpSuccess))
0739         XPC_DEACTIVATE_PARTITION(part, ret);
0740 }
0741 
0742 static void
0743 xpc_send_activate_IRQ_ch_uv(struct xpc_channel *ch, unsigned long *irq_flags,
0744              void *msg, size_t msg_size, int msg_type)
0745 {
0746     struct xpc_partition *part = &xpc_partitions[ch->partid];
0747     enum xp_retval ret;
0748 
0749     ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
0750     if (unlikely(ret != xpSuccess)) {
0751         if (irq_flags != NULL)
0752             spin_unlock_irqrestore(&ch->lock, *irq_flags);
0753 
0754         XPC_DEACTIVATE_PARTITION(part, ret);
0755 
0756         if (irq_flags != NULL)
0757             spin_lock_irqsave(&ch->lock, *irq_flags);
0758     }
0759 }
0760 
0761 static void
0762 xpc_send_local_activate_IRQ_uv(struct xpc_partition *part, int act_state_req)
0763 {
0764     unsigned long irq_flags;
0765     struct xpc_partition_uv *part_uv = &part->sn.uv;
0766 
0767     /*
0768      * !!! Make our side think that the remote partition sent an activate
0769      * !!! mq message our way by doing what the activate IRQ handler would
0770      * !!! do had one really been sent.
0771      */
0772 
0773     spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
0774     if (part_uv->act_state_req == 0)
0775         xpc_activate_IRQ_rcvd++;
0776     part_uv->act_state_req = act_state_req;
0777     spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
0778 
0779     wake_up_interruptible(&xpc_activate_IRQ_wq);
0780 }
0781 
0782 static enum xp_retval
0783 xpc_get_partition_rsvd_page_pa_uv(void *buf, u64 *cookie, unsigned long *rp_pa,
0784                   size_t *len)
0785 {
0786     s64 status;
0787     enum xp_retval ret;
0788 
0789 #if defined CONFIG_X86_64
0790     status = uv_bios_reserved_page_pa((u64)buf, cookie, (u64 *)rp_pa,
0791                       (u64 *)len);
0792     if (status == BIOS_STATUS_SUCCESS)
0793         ret = xpSuccess;
0794     else if (status == BIOS_STATUS_MORE_PASSES)
0795         ret = xpNeedMoreInfo;
0796     else
0797         ret = xpBiosError;
0798 
0799 #elif defined CONFIG_IA64_SGI_UV
0800     status = sn_partition_reserved_page_pa((u64)buf, cookie, rp_pa, len);
0801     if (status == SALRET_OK)
0802         ret = xpSuccess;
0803     else if (status == SALRET_MORE_PASSES)
0804         ret = xpNeedMoreInfo;
0805     else
0806         ret = xpSalError;
0807 
0808 #else
0809     #error not a supported configuration
0810 #endif
0811 
0812     return ret;
0813 }
0814 
0815 static int
0816 xpc_setup_rsvd_page_uv(struct xpc_rsvd_page *rp)
0817 {
0818     xpc_heartbeat_uv =
0819         &xpc_partitions[sn_partition_id].sn.uv.cached_heartbeat;
0820     rp->sn.uv.heartbeat_gpa = uv_gpa(xpc_heartbeat_uv);
0821     rp->sn.uv.activate_gru_mq_desc_gpa =
0822         uv_gpa(xpc_activate_mq_uv->gru_mq_desc);
0823     return 0;
0824 }
0825 
0826 static void
0827 xpc_allow_hb_uv(short partid)
0828 {
0829 }
0830 
0831 static void
0832 xpc_disallow_hb_uv(short partid)
0833 {
0834 }
0835 
0836 static void
0837 xpc_disallow_all_hbs_uv(void)
0838 {
0839 }
0840 
0841 static void
0842 xpc_increment_heartbeat_uv(void)
0843 {
0844     xpc_heartbeat_uv->value++;
0845 }
0846 
0847 static void
0848 xpc_offline_heartbeat_uv(void)
0849 {
0850     xpc_increment_heartbeat_uv();
0851     xpc_heartbeat_uv->offline = 1;
0852 }
0853 
0854 static void
0855 xpc_online_heartbeat_uv(void)
0856 {
0857     xpc_increment_heartbeat_uv();
0858     xpc_heartbeat_uv->offline = 0;
0859 }
0860 
0861 static void
0862 xpc_heartbeat_init_uv(void)
0863 {
0864     xpc_heartbeat_uv->value = 1;
0865     xpc_heartbeat_uv->offline = 0;
0866 }
0867 
0868 static void
0869 xpc_heartbeat_exit_uv(void)
0870 {
0871     xpc_offline_heartbeat_uv();
0872 }
0873 
0874 static enum xp_retval
0875 xpc_get_remote_heartbeat_uv(struct xpc_partition *part)
0876 {
0877     struct xpc_partition_uv *part_uv = &part->sn.uv;
0878     enum xp_retval ret;
0879 
0880     ret = xp_remote_memcpy(uv_gpa(&part_uv->cached_heartbeat),
0881                    part_uv->heartbeat_gpa,
0882                    sizeof(struct xpc_heartbeat_uv));
0883     if (ret != xpSuccess)
0884         return ret;
0885 
0886     if (part_uv->cached_heartbeat.value == part->last_heartbeat &&
0887         !part_uv->cached_heartbeat.offline) {
0888 
0889         ret = xpNoHeartbeat;
0890     } else {
0891         part->last_heartbeat = part_uv->cached_heartbeat.value;
0892     }
0893     return ret;
0894 }
0895 
0896 static void
0897 xpc_request_partition_activation_uv(struct xpc_rsvd_page *remote_rp,
0898                     unsigned long remote_rp_gpa, int nasid)
0899 {
0900     short partid = remote_rp->SAL_partid;
0901     struct xpc_partition *part = &xpc_partitions[partid];
0902     struct xpc_activate_mq_msg_activate_req_uv msg;
0903 
0904     part->remote_rp_pa = remote_rp_gpa; /* !!! _pa here is really _gpa */
0905     part->remote_rp_ts_jiffies = remote_rp->ts_jiffies;
0906     part->sn.uv.heartbeat_gpa = remote_rp->sn.uv.heartbeat_gpa;
0907     part->sn.uv.activate_gru_mq_desc_gpa =
0908         remote_rp->sn.uv.activate_gru_mq_desc_gpa;
0909 
0910     /*
0911      * ??? Is it a good idea to make this conditional on what is
0912      * ??? potentially stale state information?
0913      */
0914     if (part->sn.uv.remote_act_state == XPC_P_AS_INACTIVE) {
0915         msg.rp_gpa = uv_gpa(xpc_rsvd_page);
0916         msg.heartbeat_gpa = xpc_rsvd_page->sn.uv.heartbeat_gpa;
0917         msg.activate_gru_mq_desc_gpa =
0918             xpc_rsvd_page->sn.uv.activate_gru_mq_desc_gpa;
0919         xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
0920                        XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV);
0921     }
0922 
0923     if (part->act_state == XPC_P_AS_INACTIVE)
0924         xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
0925 }
0926 
0927 static void
0928 xpc_request_partition_reactivation_uv(struct xpc_partition *part)
0929 {
0930     xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
0931 }
0932 
0933 static void
0934 xpc_request_partition_deactivation_uv(struct xpc_partition *part)
0935 {
0936     struct xpc_activate_mq_msg_deactivate_req_uv msg;
0937 
0938     /*
0939      * ??? Is it a good idea to make this conditional on what is
0940      * ??? potentially stale state information?
0941      */
0942     if (part->sn.uv.remote_act_state != XPC_P_AS_DEACTIVATING &&
0943         part->sn.uv.remote_act_state != XPC_P_AS_INACTIVE) {
0944 
0945         msg.reason = part->reason;
0946         xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
0947                      XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV);
0948     }
0949 }
0950 
0951 static void
0952 xpc_cancel_partition_deactivation_request_uv(struct xpc_partition *part)
0953 {
0954     /* nothing needs to be done */
0955     return;
0956 }
0957 
0958 static void
0959 xpc_init_fifo_uv(struct xpc_fifo_head_uv *head)
0960 {
0961     head->first = NULL;
0962     head->last = NULL;
0963     spin_lock_init(&head->lock);
0964     head->n_entries = 0;
0965 }
0966 
0967 static void *
0968 xpc_get_fifo_entry_uv(struct xpc_fifo_head_uv *head)
0969 {
0970     unsigned long irq_flags;
0971     struct xpc_fifo_entry_uv *first;
0972 
0973     spin_lock_irqsave(&head->lock, irq_flags);
0974     first = head->first;
0975     if (head->first != NULL) {
0976         head->first = first->next;
0977         if (head->first == NULL)
0978             head->last = NULL;
0979 
0980         head->n_entries--;
0981         BUG_ON(head->n_entries < 0);
0982 
0983         first->next = NULL;
0984     }
0985     spin_unlock_irqrestore(&head->lock, irq_flags);
0986     return first;
0987 }
0988 
0989 static void
0990 xpc_put_fifo_entry_uv(struct xpc_fifo_head_uv *head,
0991               struct xpc_fifo_entry_uv *last)
0992 {
0993     unsigned long irq_flags;
0994 
0995     last->next = NULL;
0996     spin_lock_irqsave(&head->lock, irq_flags);
0997     if (head->last != NULL)
0998         head->last->next = last;
0999     else
1000         head->first = last;
1001     head->last = last;
1002     head->n_entries++;
1003     spin_unlock_irqrestore(&head->lock, irq_flags);
1004 }
1005 
1006 static int
1007 xpc_n_of_fifo_entries_uv(struct xpc_fifo_head_uv *head)
1008 {
1009     return head->n_entries;
1010 }
1011 
1012 /*
1013  * Setup the channel structures that are uv specific.
1014  */
1015 static enum xp_retval
1016 xpc_setup_ch_structures_uv(struct xpc_partition *part)
1017 {
1018     struct xpc_channel_uv *ch_uv;
1019     int ch_number;
1020 
1021     for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
1022         ch_uv = &part->channels[ch_number].sn.uv;
1023 
1024         xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1025         xpc_init_fifo_uv(&ch_uv->recv_msg_list);
1026     }
1027 
1028     return xpSuccess;
1029 }
1030 
1031 /*
1032  * Teardown the channel structures that are uv specific.
1033  */
1034 static void
1035 xpc_teardown_ch_structures_uv(struct xpc_partition *part)
1036 {
1037     /* nothing needs to be done */
1038     return;
1039 }
1040 
1041 static enum xp_retval
1042 xpc_make_first_contact_uv(struct xpc_partition *part)
1043 {
1044     struct xpc_activate_mq_msg_uv msg;
1045 
1046     /*
1047      * We send a sync msg to get the remote partition's remote_act_state
1048      * updated to our current act_state which at this point should
1049      * be XPC_P_AS_ACTIVATING.
1050      */
1051     xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1052                       XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV);
1053 
1054     while (!((part->sn.uv.remote_act_state == XPC_P_AS_ACTIVATING) ||
1055          (part->sn.uv.remote_act_state == XPC_P_AS_ACTIVE))) {
1056 
1057         dev_dbg(xpc_part, "waiting to make first contact with "
1058             "partition %d\n", XPC_PARTID(part));
1059 
1060         /* wait a 1/4 of a second or so */
1061         (void)msleep_interruptible(250);
1062 
1063         if (part->act_state == XPC_P_AS_DEACTIVATING)
1064             return part->reason;
1065     }
1066 
1067     return xpSuccess;
1068 }
1069 
1070 static u64
1071 xpc_get_chctl_all_flags_uv(struct xpc_partition *part)
1072 {
1073     unsigned long irq_flags;
1074     union xpc_channel_ctl_flags chctl;
1075 
1076     spin_lock_irqsave(&part->chctl_lock, irq_flags);
1077     chctl = part->chctl;
1078     if (chctl.all_flags != 0)
1079         part->chctl.all_flags = 0;
1080 
1081     spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1082     return chctl.all_flags;
1083 }
1084 
1085 static enum xp_retval
1086 xpc_allocate_send_msg_slot_uv(struct xpc_channel *ch)
1087 {
1088     struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1089     struct xpc_send_msg_slot_uv *msg_slot;
1090     unsigned long irq_flags;
1091     int nentries;
1092     int entry;
1093     size_t nbytes;
1094 
1095     for (nentries = ch->local_nentries; nentries > 0; nentries--) {
1096         nbytes = nentries * sizeof(struct xpc_send_msg_slot_uv);
1097         ch_uv->send_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1098         if (ch_uv->send_msg_slots == NULL)
1099             continue;
1100 
1101         for (entry = 0; entry < nentries; entry++) {
1102             msg_slot = &ch_uv->send_msg_slots[entry];
1103 
1104             msg_slot->msg_slot_number = entry;
1105             xpc_put_fifo_entry_uv(&ch_uv->msg_slot_free_list,
1106                           &msg_slot->next);
1107         }
1108 
1109         spin_lock_irqsave(&ch->lock, irq_flags);
1110         if (nentries < ch->local_nentries)
1111             ch->local_nentries = nentries;
1112         spin_unlock_irqrestore(&ch->lock, irq_flags);
1113         return xpSuccess;
1114     }
1115 
1116     return xpNoMemory;
1117 }
1118 
1119 static enum xp_retval
1120 xpc_allocate_recv_msg_slot_uv(struct xpc_channel *ch)
1121 {
1122     struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1123     struct xpc_notify_mq_msg_uv *msg_slot;
1124     unsigned long irq_flags;
1125     int nentries;
1126     int entry;
1127     size_t nbytes;
1128 
1129     for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
1130         nbytes = nentries * ch->entry_size;
1131         ch_uv->recv_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1132         if (ch_uv->recv_msg_slots == NULL)
1133             continue;
1134 
1135         for (entry = 0; entry < nentries; entry++) {
1136             msg_slot = ch_uv->recv_msg_slots +
1137                 entry * ch->entry_size;
1138 
1139             msg_slot->hdr.msg_slot_number = entry;
1140         }
1141 
1142         spin_lock_irqsave(&ch->lock, irq_flags);
1143         if (nentries < ch->remote_nentries)
1144             ch->remote_nentries = nentries;
1145         spin_unlock_irqrestore(&ch->lock, irq_flags);
1146         return xpSuccess;
1147     }
1148 
1149     return xpNoMemory;
1150 }
1151 
1152 /*
1153  * Allocate msg_slots associated with the channel.
1154  */
1155 static enum xp_retval
1156 xpc_setup_msg_structures_uv(struct xpc_channel *ch)
1157 {
1158     static enum xp_retval ret;
1159     struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1160 
1161     DBUG_ON(ch->flags & XPC_C_SETUP);
1162 
1163     ch_uv->cached_notify_gru_mq_desc = kmalloc(sizeof(struct
1164                            gru_message_queue_desc),
1165                            GFP_KERNEL);
1166     if (ch_uv->cached_notify_gru_mq_desc == NULL)
1167         return xpNoMemory;
1168 
1169     ret = xpc_allocate_send_msg_slot_uv(ch);
1170     if (ret == xpSuccess) {
1171 
1172         ret = xpc_allocate_recv_msg_slot_uv(ch);
1173         if (ret != xpSuccess) {
1174             kfree(ch_uv->send_msg_slots);
1175             xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1176         }
1177     }
1178     return ret;
1179 }
1180 
1181 /*
1182  * Free up msg_slots and clear other stuff that were setup for the specified
1183  * channel.
1184  */
1185 static void
1186 xpc_teardown_msg_structures_uv(struct xpc_channel *ch)
1187 {
1188     struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1189 
1190     lockdep_assert_held(&ch->lock);
1191 
1192     kfree(ch_uv->cached_notify_gru_mq_desc);
1193     ch_uv->cached_notify_gru_mq_desc = NULL;
1194 
1195     if (ch->flags & XPC_C_SETUP) {
1196         xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1197         kfree(ch_uv->send_msg_slots);
1198         xpc_init_fifo_uv(&ch_uv->recv_msg_list);
1199         kfree(ch_uv->recv_msg_slots);
1200     }
1201 }
1202 
1203 static void
1204 xpc_send_chctl_closerequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1205 {
1206     struct xpc_activate_mq_msg_chctl_closerequest_uv msg;
1207 
1208     msg.ch_number = ch->number;
1209     msg.reason = ch->reason;
1210     xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1211                     XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV);
1212 }
1213 
1214 static void
1215 xpc_send_chctl_closereply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1216 {
1217     struct xpc_activate_mq_msg_chctl_closereply_uv msg;
1218 
1219     msg.ch_number = ch->number;
1220     xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1221                     XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV);
1222 }
1223 
1224 static void
1225 xpc_send_chctl_openrequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1226 {
1227     struct xpc_activate_mq_msg_chctl_openrequest_uv msg;
1228 
1229     msg.ch_number = ch->number;
1230     msg.entry_size = ch->entry_size;
1231     msg.local_nentries = ch->local_nentries;
1232     xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1233                     XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV);
1234 }
1235 
1236 static void
1237 xpc_send_chctl_openreply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1238 {
1239     struct xpc_activate_mq_msg_chctl_openreply_uv msg;
1240 
1241     msg.ch_number = ch->number;
1242     msg.local_nentries = ch->local_nentries;
1243     msg.remote_nentries = ch->remote_nentries;
1244     msg.notify_gru_mq_desc_gpa = uv_gpa(xpc_notify_mq_uv->gru_mq_desc);
1245     xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1246                     XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV);
1247 }
1248 
1249 static void
1250 xpc_send_chctl_opencomplete_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1251 {
1252     struct xpc_activate_mq_msg_chctl_opencomplete_uv msg;
1253 
1254     msg.ch_number = ch->number;
1255     xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1256                     XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV);
1257 }
1258 
1259 static void
1260 xpc_send_chctl_local_msgrequest_uv(struct xpc_partition *part, int ch_number)
1261 {
1262     unsigned long irq_flags;
1263 
1264     spin_lock_irqsave(&part->chctl_lock, irq_flags);
1265     part->chctl.flags[ch_number] |= XPC_CHCTL_MSGREQUEST;
1266     spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1267 
1268     xpc_wakeup_channel_mgr(part);
1269 }
1270 
1271 static enum xp_retval
1272 xpc_save_remote_msgqueue_pa_uv(struct xpc_channel *ch,
1273                    unsigned long gru_mq_desc_gpa)
1274 {
1275     struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1276 
1277     DBUG_ON(ch_uv->cached_notify_gru_mq_desc == NULL);
1278     return xpc_cache_remote_gru_mq_desc_uv(ch_uv->cached_notify_gru_mq_desc,
1279                            gru_mq_desc_gpa);
1280 }
1281 
1282 static void
1283 xpc_indicate_partition_engaged_uv(struct xpc_partition *part)
1284 {
1285     struct xpc_activate_mq_msg_uv msg;
1286 
1287     xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1288                       XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV);
1289 }
1290 
1291 static void
1292 xpc_indicate_partition_disengaged_uv(struct xpc_partition *part)
1293 {
1294     struct xpc_activate_mq_msg_uv msg;
1295 
1296     xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1297                       XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV);
1298 }
1299 
1300 static void
1301 xpc_assume_partition_disengaged_uv(short partid)
1302 {
1303     struct xpc_partition_uv *part_uv = &xpc_partitions[partid].sn.uv;
1304     unsigned long irq_flags;
1305 
1306     spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
1307     part_uv->flags &= ~XPC_P_ENGAGED_UV;
1308     spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
1309 }
1310 
1311 static int
1312 xpc_partition_engaged_uv(short partid)
1313 {
1314     return (xpc_partitions[partid].sn.uv.flags & XPC_P_ENGAGED_UV) != 0;
1315 }
1316 
1317 static int
1318 xpc_any_partition_engaged_uv(void)
1319 {
1320     struct xpc_partition_uv *part_uv;
1321     short partid;
1322 
1323     for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
1324         part_uv = &xpc_partitions[partid].sn.uv;
1325         if ((part_uv->flags & XPC_P_ENGAGED_UV) != 0)
1326             return 1;
1327     }
1328     return 0;
1329 }
1330 
1331 static enum xp_retval
1332 xpc_allocate_msg_slot_uv(struct xpc_channel *ch, u32 flags,
1333              struct xpc_send_msg_slot_uv **address_of_msg_slot)
1334 {
1335     enum xp_retval ret;
1336     struct xpc_send_msg_slot_uv *msg_slot;
1337     struct xpc_fifo_entry_uv *entry;
1338 
1339     while (1) {
1340         entry = xpc_get_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list);
1341         if (entry != NULL)
1342             break;
1343 
1344         if (flags & XPC_NOWAIT)
1345             return xpNoWait;
1346 
1347         ret = xpc_allocate_msg_wait(ch);
1348         if (ret != xpInterrupted && ret != xpTimeout)
1349             return ret;
1350     }
1351 
1352     msg_slot = container_of(entry, struct xpc_send_msg_slot_uv, next);
1353     *address_of_msg_slot = msg_slot;
1354     return xpSuccess;
1355 }
1356 
1357 static void
1358 xpc_free_msg_slot_uv(struct xpc_channel *ch,
1359              struct xpc_send_msg_slot_uv *msg_slot)
1360 {
1361     xpc_put_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list, &msg_slot->next);
1362 
1363     /* wakeup anyone waiting for a free msg slot */
1364     if (atomic_read(&ch->n_on_msg_allocate_wq) > 0)
1365         wake_up(&ch->msg_allocate_wq);
1366 }
1367 
1368 static void
1369 xpc_notify_sender_uv(struct xpc_channel *ch,
1370              struct xpc_send_msg_slot_uv *msg_slot,
1371              enum xp_retval reason)
1372 {
1373     xpc_notify_func func = msg_slot->func;
1374 
1375     if (func != NULL && cmpxchg(&msg_slot->func, func, NULL) == func) {
1376 
1377         atomic_dec(&ch->n_to_notify);
1378 
1379         dev_dbg(xpc_chan, "msg_slot->func() called, msg_slot=0x%p "
1380             "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1381             msg_slot->msg_slot_number, ch->partid, ch->number);
1382 
1383         func(reason, ch->partid, ch->number, msg_slot->key);
1384 
1385         dev_dbg(xpc_chan, "msg_slot->func() returned, msg_slot=0x%p "
1386             "msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1387             msg_slot->msg_slot_number, ch->partid, ch->number);
1388     }
1389 }
1390 
1391 static void
1392 xpc_handle_notify_mq_ack_uv(struct xpc_channel *ch,
1393                 struct xpc_notify_mq_msg_uv *msg)
1394 {
1395     struct xpc_send_msg_slot_uv *msg_slot;
1396     int entry = msg->hdr.msg_slot_number % ch->local_nentries;
1397 
1398     msg_slot = &ch->sn.uv.send_msg_slots[entry];
1399 
1400     BUG_ON(msg_slot->msg_slot_number != msg->hdr.msg_slot_number);
1401     msg_slot->msg_slot_number += ch->local_nentries;
1402 
1403     if (msg_slot->func != NULL)
1404         xpc_notify_sender_uv(ch, msg_slot, xpMsgDelivered);
1405 
1406     xpc_free_msg_slot_uv(ch, msg_slot);
1407 }
1408 
1409 static void
1410 xpc_handle_notify_mq_msg_uv(struct xpc_partition *part,
1411                 struct xpc_notify_mq_msg_uv *msg)
1412 {
1413     struct xpc_partition_uv *part_uv = &part->sn.uv;
1414     struct xpc_channel *ch;
1415     struct xpc_channel_uv *ch_uv;
1416     struct xpc_notify_mq_msg_uv *msg_slot;
1417     unsigned long irq_flags;
1418     int ch_number = msg->hdr.ch_number;
1419 
1420     if (unlikely(ch_number >= part->nchannels)) {
1421         dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received invalid "
1422             "channel number=0x%x in message from partid=%d\n",
1423             ch_number, XPC_PARTID(part));
1424 
1425         /* get hb checker to deactivate from the remote partition */
1426         spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1427         if (part_uv->act_state_req == 0)
1428             xpc_activate_IRQ_rcvd++;
1429         part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
1430         part_uv->reason = xpBadChannelNumber;
1431         spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1432 
1433         wake_up_interruptible(&xpc_activate_IRQ_wq);
1434         return;
1435     }
1436 
1437     ch = &part->channels[ch_number];
1438     xpc_msgqueue_ref(ch);
1439 
1440     if (!(ch->flags & XPC_C_CONNECTED)) {
1441         xpc_msgqueue_deref(ch);
1442         return;
1443     }
1444 
1445     /* see if we're really dealing with an ACK for a previously sent msg */
1446     if (msg->hdr.size == 0) {
1447         xpc_handle_notify_mq_ack_uv(ch, msg);
1448         xpc_msgqueue_deref(ch);
1449         return;
1450     }
1451 
1452     /* we're dealing with a normal message sent via the notify_mq */
1453     ch_uv = &ch->sn.uv;
1454 
1455     msg_slot = ch_uv->recv_msg_slots +
1456         (msg->hdr.msg_slot_number % ch->remote_nentries) * ch->entry_size;
1457 
1458     BUG_ON(msg_slot->hdr.size != 0);
1459 
1460     memcpy(msg_slot, msg, msg->hdr.size);
1461 
1462     xpc_put_fifo_entry_uv(&ch_uv->recv_msg_list, &msg_slot->hdr.u.next);
1463 
1464     if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) {
1465         /*
1466          * If there is an existing idle kthread get it to deliver
1467          * the payload, otherwise we'll have to get the channel mgr
1468          * for this partition to create a kthread to do the delivery.
1469          */
1470         if (atomic_read(&ch->kthreads_idle) > 0)
1471             wake_up_nr(&ch->idle_wq, 1);
1472         else
1473             xpc_send_chctl_local_msgrequest_uv(part, ch->number);
1474     }
1475     xpc_msgqueue_deref(ch);
1476 }
1477 
1478 static irqreturn_t
1479 xpc_handle_notify_IRQ_uv(int irq, void *dev_id)
1480 {
1481     struct xpc_notify_mq_msg_uv *msg;
1482     short partid;
1483     struct xpc_partition *part;
1484 
1485     while ((msg = gru_get_next_message(xpc_notify_mq_uv->gru_mq_desc)) !=
1486            NULL) {
1487 
1488         partid = msg->hdr.partid;
1489         if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
1490             dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received "
1491                 "invalid partid=0x%x in message\n", partid);
1492         } else {
1493             part = &xpc_partitions[partid];
1494 
1495             if (xpc_part_ref(part)) {
1496                 xpc_handle_notify_mq_msg_uv(part, msg);
1497                 xpc_part_deref(part);
1498             }
1499         }
1500 
1501         gru_free_message(xpc_notify_mq_uv->gru_mq_desc, msg);
1502     }
1503 
1504     return IRQ_HANDLED;
1505 }
1506 
1507 static int
1508 xpc_n_of_deliverable_payloads_uv(struct xpc_channel *ch)
1509 {
1510     return xpc_n_of_fifo_entries_uv(&ch->sn.uv.recv_msg_list);
1511 }
1512 
1513 static void
1514 xpc_process_msg_chctl_flags_uv(struct xpc_partition *part, int ch_number)
1515 {
1516     struct xpc_channel *ch = &part->channels[ch_number];
1517     int ndeliverable_payloads;
1518 
1519     xpc_msgqueue_ref(ch);
1520 
1521     ndeliverable_payloads = xpc_n_of_deliverable_payloads_uv(ch);
1522 
1523     if (ndeliverable_payloads > 0 &&
1524         (ch->flags & XPC_C_CONNECTED) &&
1525         (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE)) {
1526 
1527         xpc_activate_kthreads(ch, ndeliverable_payloads);
1528     }
1529 
1530     xpc_msgqueue_deref(ch);
1531 }
1532 
1533 static enum xp_retval
1534 xpc_send_payload_uv(struct xpc_channel *ch, u32 flags, void *payload,
1535             u16 payload_size, u8 notify_type, xpc_notify_func func,
1536             void *key)
1537 {
1538     enum xp_retval ret = xpSuccess;
1539     struct xpc_send_msg_slot_uv *msg_slot = NULL;
1540     struct xpc_notify_mq_msg_uv *msg;
1541     u8 msg_buffer[XPC_NOTIFY_MSG_SIZE_UV];
1542     size_t msg_size;
1543 
1544     DBUG_ON(notify_type != XPC_N_CALL);
1545 
1546     msg_size = sizeof(struct xpc_notify_mq_msghdr_uv) + payload_size;
1547     if (msg_size > ch->entry_size)
1548         return xpPayloadTooBig;
1549 
1550     xpc_msgqueue_ref(ch);
1551 
1552     if (ch->flags & XPC_C_DISCONNECTING) {
1553         ret = ch->reason;
1554         goto out_1;
1555     }
1556     if (!(ch->flags & XPC_C_CONNECTED)) {
1557         ret = xpNotConnected;
1558         goto out_1;
1559     }
1560 
1561     ret = xpc_allocate_msg_slot_uv(ch, flags, &msg_slot);
1562     if (ret != xpSuccess)
1563         goto out_1;
1564 
1565     if (func != NULL) {
1566         atomic_inc(&ch->n_to_notify);
1567 
1568         msg_slot->key = key;
1569         smp_wmb(); /* a non-NULL func must hit memory after the key */
1570         msg_slot->func = func;
1571 
1572         if (ch->flags & XPC_C_DISCONNECTING) {
1573             ret = ch->reason;
1574             goto out_2;
1575         }
1576     }
1577 
1578     msg = (struct xpc_notify_mq_msg_uv *)&msg_buffer;
1579     msg->hdr.partid = xp_partition_id;
1580     msg->hdr.ch_number = ch->number;
1581     msg->hdr.size = msg_size;
1582     msg->hdr.msg_slot_number = msg_slot->msg_slot_number;
1583     memcpy(&msg->payload, payload, payload_size);
1584 
1585     ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1586                    msg_size);
1587     if (ret == xpSuccess)
1588         goto out_1;
1589 
1590     XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1591 out_2:
1592     if (func != NULL) {
1593         /*
1594          * Try to NULL the msg_slot's func field. If we fail, then
1595          * xpc_notify_senders_of_disconnect_uv() beat us to it, in which
1596          * case we need to pretend we succeeded to send the message
1597          * since the user will get a callout for the disconnect error
1598          * by xpc_notify_senders_of_disconnect_uv(), and to also get an
1599          * error returned here will confuse them. Additionally, since
1600          * in this case the channel is being disconnected we don't need
1601          * to put the msg_slot back on the free list.
1602          */
1603         if (cmpxchg(&msg_slot->func, func, NULL) != func) {
1604             ret = xpSuccess;
1605             goto out_1;
1606         }
1607 
1608         msg_slot->key = NULL;
1609         atomic_dec(&ch->n_to_notify);
1610     }
1611     xpc_free_msg_slot_uv(ch, msg_slot);
1612 out_1:
1613     xpc_msgqueue_deref(ch);
1614     return ret;
1615 }
1616 
1617 /*
1618  * Tell the callers of xpc_send_notify() that the status of their payloads
1619  * is unknown because the channel is now disconnecting.
1620  *
1621  * We don't worry about putting these msg_slots on the free list since the
1622  * msg_slots themselves are about to be kfree'd.
1623  */
1624 static void
1625 xpc_notify_senders_of_disconnect_uv(struct xpc_channel *ch)
1626 {
1627     struct xpc_send_msg_slot_uv *msg_slot;
1628     int entry;
1629 
1630     DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING));
1631 
1632     for (entry = 0; entry < ch->local_nentries; entry++) {
1633 
1634         if (atomic_read(&ch->n_to_notify) == 0)
1635             break;
1636 
1637         msg_slot = &ch->sn.uv.send_msg_slots[entry];
1638         if (msg_slot->func != NULL)
1639             xpc_notify_sender_uv(ch, msg_slot, ch->reason);
1640     }
1641 }
1642 
1643 /*
1644  * Get the next deliverable message's payload.
1645  */
1646 static void *
1647 xpc_get_deliverable_payload_uv(struct xpc_channel *ch)
1648 {
1649     struct xpc_fifo_entry_uv *entry;
1650     struct xpc_notify_mq_msg_uv *msg;
1651     void *payload = NULL;
1652 
1653     if (!(ch->flags & XPC_C_DISCONNECTING)) {
1654         entry = xpc_get_fifo_entry_uv(&ch->sn.uv.recv_msg_list);
1655         if (entry != NULL) {
1656             msg = container_of(entry, struct xpc_notify_mq_msg_uv,
1657                        hdr.u.next);
1658             payload = &msg->payload;
1659         }
1660     }
1661     return payload;
1662 }
1663 
1664 static void
1665 xpc_received_payload_uv(struct xpc_channel *ch, void *payload)
1666 {
1667     struct xpc_notify_mq_msg_uv *msg;
1668     enum xp_retval ret;
1669 
1670     msg = container_of(payload, struct xpc_notify_mq_msg_uv, payload);
1671 
1672     /* return an ACK to the sender of this message */
1673 
1674     msg->hdr.partid = xp_partition_id;
1675     msg->hdr.size = 0;  /* size of zero indicates this is an ACK */
1676 
1677     ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1678                    sizeof(struct xpc_notify_mq_msghdr_uv));
1679     if (ret != xpSuccess)
1680         XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1681 }
1682 
1683 static const struct xpc_arch_operations xpc_arch_ops_uv = {
1684     .setup_partitions = xpc_setup_partitions_uv,
1685     .teardown_partitions = xpc_teardown_partitions_uv,
1686     .process_activate_IRQ_rcvd = xpc_process_activate_IRQ_rcvd_uv,
1687     .get_partition_rsvd_page_pa = xpc_get_partition_rsvd_page_pa_uv,
1688     .setup_rsvd_page = xpc_setup_rsvd_page_uv,
1689 
1690     .allow_hb = xpc_allow_hb_uv,
1691     .disallow_hb = xpc_disallow_hb_uv,
1692     .disallow_all_hbs = xpc_disallow_all_hbs_uv,
1693     .increment_heartbeat = xpc_increment_heartbeat_uv,
1694     .offline_heartbeat = xpc_offline_heartbeat_uv,
1695     .online_heartbeat = xpc_online_heartbeat_uv,
1696     .heartbeat_init = xpc_heartbeat_init_uv,
1697     .heartbeat_exit = xpc_heartbeat_exit_uv,
1698     .get_remote_heartbeat = xpc_get_remote_heartbeat_uv,
1699 
1700     .request_partition_activation =
1701         xpc_request_partition_activation_uv,
1702     .request_partition_reactivation =
1703         xpc_request_partition_reactivation_uv,
1704     .request_partition_deactivation =
1705         xpc_request_partition_deactivation_uv,
1706     .cancel_partition_deactivation_request =
1707         xpc_cancel_partition_deactivation_request_uv,
1708 
1709     .setup_ch_structures = xpc_setup_ch_structures_uv,
1710     .teardown_ch_structures = xpc_teardown_ch_structures_uv,
1711 
1712     .make_first_contact = xpc_make_first_contact_uv,
1713 
1714     .get_chctl_all_flags = xpc_get_chctl_all_flags_uv,
1715     .send_chctl_closerequest = xpc_send_chctl_closerequest_uv,
1716     .send_chctl_closereply = xpc_send_chctl_closereply_uv,
1717     .send_chctl_openrequest = xpc_send_chctl_openrequest_uv,
1718     .send_chctl_openreply = xpc_send_chctl_openreply_uv,
1719     .send_chctl_opencomplete = xpc_send_chctl_opencomplete_uv,
1720     .process_msg_chctl_flags = xpc_process_msg_chctl_flags_uv,
1721 
1722     .save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_uv,
1723 
1724     .setup_msg_structures = xpc_setup_msg_structures_uv,
1725     .teardown_msg_structures = xpc_teardown_msg_structures_uv,
1726 
1727     .indicate_partition_engaged = xpc_indicate_partition_engaged_uv,
1728     .indicate_partition_disengaged = xpc_indicate_partition_disengaged_uv,
1729     .assume_partition_disengaged = xpc_assume_partition_disengaged_uv,
1730     .partition_engaged = xpc_partition_engaged_uv,
1731     .any_partition_engaged = xpc_any_partition_engaged_uv,
1732 
1733     .n_of_deliverable_payloads = xpc_n_of_deliverable_payloads_uv,
1734     .send_payload = xpc_send_payload_uv,
1735     .get_deliverable_payload = xpc_get_deliverable_payload_uv,
1736     .received_payload = xpc_received_payload_uv,
1737     .notify_senders_of_disconnect = xpc_notify_senders_of_disconnect_uv,
1738 };
1739 
1740 static int
1741 xpc_init_mq_node(int nid)
1742 {
1743     int cpu;
1744 
1745     cpus_read_lock();
1746 
1747     for_each_cpu(cpu, cpumask_of_node(nid)) {
1748         xpc_activate_mq_uv =
1749             xpc_create_gru_mq_uv(XPC_ACTIVATE_MQ_SIZE_UV, nid,
1750                          XPC_ACTIVATE_IRQ_NAME,
1751                          xpc_handle_activate_IRQ_uv);
1752         if (!IS_ERR(xpc_activate_mq_uv))
1753             break;
1754     }
1755     if (IS_ERR(xpc_activate_mq_uv)) {
1756         cpus_read_unlock();
1757         return PTR_ERR(xpc_activate_mq_uv);
1758     }
1759 
1760     for_each_cpu(cpu, cpumask_of_node(nid)) {
1761         xpc_notify_mq_uv =
1762             xpc_create_gru_mq_uv(XPC_NOTIFY_MQ_SIZE_UV, nid,
1763                          XPC_NOTIFY_IRQ_NAME,
1764                          xpc_handle_notify_IRQ_uv);
1765         if (!IS_ERR(xpc_notify_mq_uv))
1766             break;
1767     }
1768     if (IS_ERR(xpc_notify_mq_uv)) {
1769         xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1770         cpus_read_unlock();
1771         return PTR_ERR(xpc_notify_mq_uv);
1772     }
1773 
1774     cpus_read_unlock();
1775     return 0;
1776 }
1777 
1778 int
1779 xpc_init_uv(void)
1780 {
1781     int nid;
1782     int ret = 0;
1783 
1784     xpc_arch_ops = xpc_arch_ops_uv;
1785 
1786     if (sizeof(struct xpc_notify_mq_msghdr_uv) > XPC_MSG_HDR_MAX_SIZE) {
1787         dev_err(xpc_part, "xpc_notify_mq_msghdr_uv is larger than %d\n",
1788             XPC_MSG_HDR_MAX_SIZE);
1789         return -E2BIG;
1790     }
1791 
1792     if (xpc_mq_node < 0)
1793         for_each_online_node(nid) {
1794             ret = xpc_init_mq_node(nid);
1795 
1796             if (!ret)
1797                 break;
1798         }
1799     else
1800         ret = xpc_init_mq_node(xpc_mq_node);
1801 
1802     if (ret < 0)
1803         dev_err(xpc_part, "xpc_init_mq_node() returned error=%d\n",
1804             -ret);
1805 
1806     return ret;
1807 }
1808 
1809 void
1810 xpc_exit_uv(void)
1811 {
1812     xpc_destroy_gru_mq_uv(xpc_notify_mq_uv);
1813     xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1814 }
1815 
1816 module_param(xpc_mq_node, int, 0);
1817 MODULE_PARM_DESC(xpc_mq_node, "Node number on which to allocate message queues.");
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