Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1817 insertions, 0 deletions

diff --git a/drivers/misc/sgi-xp/xpc_uv.c b/drivers/misc/sgi-xp/xpc_uv.c
new file mode 100644
index 000000000..7791bde81
--- /dev/null
+++ b/drivers/misc/sgi-xp/xpc_uv.c
@@ -0,0 +1,1817 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2008-2009 Silicon Graphics, Inc.  All Rights Reserved.
+ */
+
+/*
+ * Cross Partition Communication (XPC) uv-based functions.
+ *
+ *     Architecture specific implementation of common functions.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/cpu.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/numa.h>
+#include <asm/uv/uv_hub.h>
+#if defined CONFIG_X86_64
+#include <asm/uv/bios.h>
+#include <asm/uv/uv_irq.h>
+#elif defined CONFIG_IA64_SGI_UV
+#include <asm/sn/intr.h>
+#include <asm/sn/sn_sal.h>
+#endif
+#include "../sgi-gru/gru.h"
+#include "../sgi-gru/grukservices.h"
+#include "xpc.h"
+
+#if defined CONFIG_IA64_SGI_UV
+struct uv_IO_APIC_route_entry {
+	__u64	vector		:  8,
+		delivery_mode	:  3,
+		dest_mode	:  1,
+		delivery_status	:  1,
+		polarity	:  1,
+		__reserved_1	:  1,
+		trigger		:  1,
+		mask		:  1,
+		__reserved_2	: 15,
+		dest		: 32;
+};
+
+#define sn_partition_id 0
+#endif
+
+static struct xpc_heartbeat_uv *xpc_heartbeat_uv;
+
+#define XPC_ACTIVATE_MSG_SIZE_UV	(1 * GRU_CACHE_LINE_BYTES)
+#define XPC_ACTIVATE_MQ_SIZE_UV		(4 * XP_MAX_NPARTITIONS_UV * \
+					 XPC_ACTIVATE_MSG_SIZE_UV)
+#define XPC_ACTIVATE_IRQ_NAME		"xpc_activate"
+
+#define XPC_NOTIFY_MSG_SIZE_UV		(2 * GRU_CACHE_LINE_BYTES)
+#define XPC_NOTIFY_MQ_SIZE_UV		(4 * XP_MAX_NPARTITIONS_UV * \
+					 XPC_NOTIFY_MSG_SIZE_UV)
+#define XPC_NOTIFY_IRQ_NAME		"xpc_notify"
+
+static int xpc_mq_node = NUMA_NO_NODE;
+
+static struct xpc_gru_mq_uv *xpc_activate_mq_uv;
+static struct xpc_gru_mq_uv *xpc_notify_mq_uv;
+
+static int
+xpc_setup_partitions_uv(void)
+{
+	short partid;
+	struct xpc_partition_uv *part_uv;
+
+	for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
+		part_uv = &xpc_partitions[partid].sn.uv;
+
+		mutex_init(&part_uv->cached_activate_gru_mq_desc_mutex);
+		spin_lock_init(&part_uv->flags_lock);
+		part_uv->remote_act_state = XPC_P_AS_INACTIVE;
+	}
+	return 0;
+}
+
+static void
+xpc_teardown_partitions_uv(void)
+{
+	short partid;
+	struct xpc_partition_uv *part_uv;
+	unsigned long irq_flags;
+
+	for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
+		part_uv = &xpc_partitions[partid].sn.uv;
+
+		if (part_uv->cached_activate_gru_mq_desc != NULL) {
+			mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
+			spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
+			part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
+			spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
+			kfree(part_uv->cached_activate_gru_mq_desc);
+			part_uv->cached_activate_gru_mq_desc = NULL;
+			mutex_unlock(&part_uv->
+				     cached_activate_gru_mq_desc_mutex);
+		}
+	}
+}
+
+static int
+xpc_get_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq, int cpu, char *irq_name)
+{
+	int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
+
+#if defined CONFIG_X86_64
+	mq->irq = uv_setup_irq(irq_name, cpu, mq->mmr_blade, mq->mmr_offset,
+			UV_AFFINITY_CPU);
+	if (mq->irq < 0)
+		return mq->irq;
+
+	mq->mmr_value = uv_read_global_mmr64(mmr_pnode, mq->mmr_offset);
+
+#elif defined CONFIG_IA64_SGI_UV
+	if (strcmp(irq_name, XPC_ACTIVATE_IRQ_NAME) == 0)
+		mq->irq = SGI_XPC_ACTIVATE;
+	else if (strcmp(irq_name, XPC_NOTIFY_IRQ_NAME) == 0)
+		mq->irq = SGI_XPC_NOTIFY;
+	else
+		return -EINVAL;
+
+	mq->mmr_value = (unsigned long)cpu_physical_id(cpu) << 32 | mq->irq;
+	uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mq->mmr_value);
+#else
+	#error not a supported configuration
+#endif
+
+	return 0;
+}
+
+static void
+xpc_release_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq)
+{
+#if defined CONFIG_X86_64
+	uv_teardown_irq(mq->irq);
+
+#elif defined CONFIG_IA64_SGI_UV
+	int mmr_pnode;
+	unsigned long mmr_value;
+
+	mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
+	mmr_value = 1UL << 16;
+
+	uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mmr_value);
+#else
+	#error not a supported configuration
+#endif
+}
+
+static int
+xpc_gru_mq_watchlist_alloc_uv(struct xpc_gru_mq_uv *mq)
+{
+	int ret;
+
+#if defined CONFIG_IA64_SGI_UV
+	int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
+
+	ret = sn_mq_watchlist_alloc(mmr_pnode, (void *)uv_gpa(mq->address),
+				    mq->order, &mq->mmr_offset);
+	if (ret < 0) {
+		dev_err(xpc_part, "sn_mq_watchlist_alloc() failed, ret=%d\n",
+			ret);
+		return -EBUSY;
+	}
+#elif defined CONFIG_X86_64
+	ret = uv_bios_mq_watchlist_alloc(uv_gpa(mq->address),
+					 mq->order, &mq->mmr_offset);
+	if (ret < 0) {
+		dev_err(xpc_part, "uv_bios_mq_watchlist_alloc() failed, "
+			"ret=%d\n", ret);
+		return ret;
+	}
+#else
+	#error not a supported configuration
+#endif
+
+	mq->watchlist_num = ret;
+	return 0;
+}
+
+static void
+xpc_gru_mq_watchlist_free_uv(struct xpc_gru_mq_uv *mq)
+{
+	int ret;
+	int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
+
+#if defined CONFIG_X86_64
+	ret = uv_bios_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
+	BUG_ON(ret != BIOS_STATUS_SUCCESS);
+#elif defined CONFIG_IA64_SGI_UV
+	ret = sn_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
+	BUG_ON(ret != SALRET_OK);
+#else
+	#error not a supported configuration
+#endif
+}
+
+static struct xpc_gru_mq_uv *
+xpc_create_gru_mq_uv(unsigned int mq_size, int cpu, char *irq_name,
+		     irq_handler_t irq_handler)
+{
+	enum xp_retval xp_ret;
+	int ret;
+	int nid;
+	int nasid;
+	int pg_order;
+	struct page *page;
+	struct xpc_gru_mq_uv *mq;
+	struct uv_IO_APIC_route_entry *mmr_value;
+
+	mq = kmalloc(sizeof(struct xpc_gru_mq_uv), GFP_KERNEL);
+	if (mq == NULL) {
+		dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
+			"a xpc_gru_mq_uv structure\n");
+		ret = -ENOMEM;
+		goto out_0;
+	}
+
+	mq->gru_mq_desc = kzalloc(sizeof(struct gru_message_queue_desc),
+				  GFP_KERNEL);
+	if (mq->gru_mq_desc == NULL) {
+		dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
+			"a gru_message_queue_desc structure\n");
+		ret = -ENOMEM;
+		goto out_1;
+	}
+
+	pg_order = get_order(mq_size);
+	mq->order = pg_order + PAGE_SHIFT;
+	mq_size = 1UL << mq->order;
+
+	mq->mmr_blade = uv_cpu_to_blade_id(cpu);
+
+	nid = cpu_to_node(cpu);
+	page = __alloc_pages_node(nid,
+				      GFP_KERNEL | __GFP_ZERO | __GFP_THISNODE,
+				      pg_order);
+	if (page == NULL) {
+		dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to alloc %d "
+			"bytes of memory on nid=%d for GRU mq\n", mq_size, nid);
+		ret = -ENOMEM;
+		goto out_2;
+	}
+	mq->address = page_address(page);
+
+	/* enable generation of irq when GRU mq operation occurs to this mq */
+	ret = xpc_gru_mq_watchlist_alloc_uv(mq);
+	if (ret != 0)
+		goto out_3;
+
+	ret = xpc_get_gru_mq_irq_uv(mq, cpu, irq_name);
+	if (ret != 0)
+		goto out_4;
+
+	ret = request_irq(mq->irq, irq_handler, 0, irq_name, NULL);
+	if (ret != 0) {
+		dev_err(xpc_part, "request_irq(irq=%d) returned error=%d\n",
+			mq->irq, -ret);
+		goto out_5;
+	}
+
+	nasid = UV_PNODE_TO_NASID(uv_cpu_to_pnode(cpu));
+
+	mmr_value = (struct uv_IO_APIC_route_entry *)&mq->mmr_value;
+	ret = gru_create_message_queue(mq->gru_mq_desc, mq->address, mq_size,
+				     nasid, mmr_value->vector, mmr_value->dest);
+	if (ret != 0) {
+		dev_err(xpc_part, "gru_create_message_queue() returned "
+			"error=%d\n", ret);
+		ret = -EINVAL;
+		goto out_6;
+	}
+
+	/* allow other partitions to access this GRU mq */
+	xp_ret = xp_expand_memprotect(xp_pa(mq->address), mq_size);
+	if (xp_ret != xpSuccess) {
+		ret = -EACCES;
+		goto out_6;
+	}
+
+	return mq;
+
+	/* something went wrong */
+out_6:
+	free_irq(mq->irq, NULL);
+out_5:
+	xpc_release_gru_mq_irq_uv(mq);
+out_4:
+	xpc_gru_mq_watchlist_free_uv(mq);
+out_3:
+	free_pages((unsigned long)mq->address, pg_order);
+out_2:
+	kfree(mq->gru_mq_desc);
+out_1:
+	kfree(mq);
+out_0:
+	return ERR_PTR(ret);
+}
+
+static void
+xpc_destroy_gru_mq_uv(struct xpc_gru_mq_uv *mq)
+{
+	unsigned int mq_size;
+	int pg_order;
+	int ret;
+
+	/* disallow other partitions to access GRU mq */
+	mq_size = 1UL << mq->order;
+	ret = xp_restrict_memprotect(xp_pa(mq->address), mq_size);
+	BUG_ON(ret != xpSuccess);
+
+	/* unregister irq handler and release mq irq/vector mapping */
+	free_irq(mq->irq, NULL);
+	xpc_release_gru_mq_irq_uv(mq);
+
+	/* disable generation of irq when GRU mq op occurs to this mq */
+	xpc_gru_mq_watchlist_free_uv(mq);
+
+	pg_order = mq->order - PAGE_SHIFT;
+	free_pages((unsigned long)mq->address, pg_order);
+
+	kfree(mq);
+}
+
+static enum xp_retval
+xpc_send_gru_msg(struct gru_message_queue_desc *gru_mq_desc, void *msg,
+		 size_t msg_size)
+{
+	enum xp_retval xp_ret;
+	int ret;
+
+	while (1) {
+		ret = gru_send_message_gpa(gru_mq_desc, msg, msg_size);
+		if (ret == MQE_OK) {
+			xp_ret = xpSuccess;
+			break;
+		}
+
+		if (ret == MQE_QUEUE_FULL) {
+			dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
+				"error=MQE_QUEUE_FULL\n");
+			/* !!! handle QLimit reached; delay & try again */
+			/* ??? Do we add a limit to the number of retries? */
+			(void)msleep_interruptible(10);
+		} else if (ret == MQE_CONGESTION) {
+			dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
+				"error=MQE_CONGESTION\n");
+			/* !!! handle LB Overflow; simply try again */
+			/* ??? Do we add a limit to the number of retries? */
+		} else {
+			/* !!! Currently this is MQE_UNEXPECTED_CB_ERR */
+			dev_err(xpc_chan, "gru_send_message_gpa() returned "
+				"error=%d\n", ret);
+			xp_ret = xpGruSendMqError;
+			break;
+		}
+	}
+	return xp_ret;
+}
+
+static void
+xpc_process_activate_IRQ_rcvd_uv(void)
+{
+	unsigned long irq_flags;
+	short partid;
+	struct xpc_partition *part;
+	u8 act_state_req;
+
+	DBUG_ON(xpc_activate_IRQ_rcvd == 0);
+
+	spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+	for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
+		part = &xpc_partitions[partid];
+
+		if (part->sn.uv.act_state_req == 0)
+			continue;
+
+		xpc_activate_IRQ_rcvd--;
+		BUG_ON(xpc_activate_IRQ_rcvd < 0);
+
+		act_state_req = part->sn.uv.act_state_req;
+		part->sn.uv.act_state_req = 0;
+		spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+
+		if (act_state_req == XPC_P_ASR_ACTIVATE_UV) {
+			if (part->act_state == XPC_P_AS_INACTIVE)
+				xpc_activate_partition(part);
+			else if (part->act_state == XPC_P_AS_DEACTIVATING)
+				XPC_DEACTIVATE_PARTITION(part, xpReactivating);
+
+		} else if (act_state_req == XPC_P_ASR_REACTIVATE_UV) {
+			if (part->act_state == XPC_P_AS_INACTIVE)
+				xpc_activate_partition(part);
+			else
+				XPC_DEACTIVATE_PARTITION(part, xpReactivating);
+
+		} else if (act_state_req == XPC_P_ASR_DEACTIVATE_UV) {
+			XPC_DEACTIVATE_PARTITION(part, part->sn.uv.reason);
+
+		} else {
+			BUG();
+		}
+
+		spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+		if (xpc_activate_IRQ_rcvd == 0)
+			break;
+	}
+	spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+
+}
+
+static void
+xpc_handle_activate_mq_msg_uv(struct xpc_partition *part,
+			      struct xpc_activate_mq_msghdr_uv *msg_hdr,
+			      int part_setup,
+			      int *wakeup_hb_checker)
+{
+	unsigned long irq_flags;
+	struct xpc_partition_uv *part_uv = &part->sn.uv;
+	struct xpc_openclose_args *args;
+
+	part_uv->remote_act_state = msg_hdr->act_state;
+
+	switch (msg_hdr->type) {
+	case XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV:
+		/* syncing of remote_act_state was just done above */
+		break;
+
+	case XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV: {
+		struct xpc_activate_mq_msg_activate_req_uv *msg;
+
+		/*
+		 * ??? Do we deal here with ts_jiffies being different
+		 * ??? if act_state != XPC_P_AS_INACTIVE instead of
+		 * ??? below?
+		 */
+		msg = container_of(msg_hdr, struct
+				   xpc_activate_mq_msg_activate_req_uv, hdr);
+
+		spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+		if (part_uv->act_state_req == 0)
+			xpc_activate_IRQ_rcvd++;
+		part_uv->act_state_req = XPC_P_ASR_ACTIVATE_UV;
+		part->remote_rp_pa = msg->rp_gpa; /* !!! _pa is _gpa */
+		part->remote_rp_ts_jiffies = msg_hdr->rp_ts_jiffies;
+		part_uv->heartbeat_gpa = msg->heartbeat_gpa;
+
+		if (msg->activate_gru_mq_desc_gpa !=
+		    part_uv->activate_gru_mq_desc_gpa) {
+			spin_lock(&part_uv->flags_lock);
+			part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
+			spin_unlock(&part_uv->flags_lock);
+			part_uv->activate_gru_mq_desc_gpa =
+			    msg->activate_gru_mq_desc_gpa;
+		}
+		spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+
+		(*wakeup_hb_checker)++;
+		break;
+	}
+	case XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV: {
+		struct xpc_activate_mq_msg_deactivate_req_uv *msg;
+
+		msg = container_of(msg_hdr, struct
+				   xpc_activate_mq_msg_deactivate_req_uv, hdr);
+
+		spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+		if (part_uv->act_state_req == 0)
+			xpc_activate_IRQ_rcvd++;
+		part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
+		part_uv->reason = msg->reason;
+		spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+
+		(*wakeup_hb_checker)++;
+		return;
+	}
+	case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV: {
+		struct xpc_activate_mq_msg_chctl_closerequest_uv *msg;
+
+		if (!part_setup)
+			break;
+
+		msg = container_of(msg_hdr, struct
+				   xpc_activate_mq_msg_chctl_closerequest_uv,
+				   hdr);
+		args = &part->remote_openclose_args[msg->ch_number];
+		args->reason = msg->reason;
+
+		spin_lock_irqsave(&part->chctl_lock, irq_flags);
+		part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREQUEST;
+		spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
+
+		xpc_wakeup_channel_mgr(part);
+		break;
+	}
+	case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV: {
+		struct xpc_activate_mq_msg_chctl_closereply_uv *msg;
+
+		if (!part_setup)
+			break;
+
+		msg = container_of(msg_hdr, struct
+				   xpc_activate_mq_msg_chctl_closereply_uv,
+				   hdr);
+
+		spin_lock_irqsave(&part->chctl_lock, irq_flags);
+		part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREPLY;
+		spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
+
+		xpc_wakeup_channel_mgr(part);
+		break;
+	}
+	case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV: {
+		struct xpc_activate_mq_msg_chctl_openrequest_uv *msg;
+
+		if (!part_setup)
+			break;
+
+		msg = container_of(msg_hdr, struct
+				   xpc_activate_mq_msg_chctl_openrequest_uv,
+				   hdr);
+		args = &part->remote_openclose_args[msg->ch_number];
+		args->entry_size = msg->entry_size;
+		args->local_nentries = msg->local_nentries;
+
+		spin_lock_irqsave(&part->chctl_lock, irq_flags);
+		part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREQUEST;
+		spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
+
+		xpc_wakeup_channel_mgr(part);
+		break;
+	}
+	case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV: {
+		struct xpc_activate_mq_msg_chctl_openreply_uv *msg;
+
+		if (!part_setup)
+			break;
+
+		msg = container_of(msg_hdr, struct
+				   xpc_activate_mq_msg_chctl_openreply_uv, hdr);
+		args = &part->remote_openclose_args[msg->ch_number];
+		args->remote_nentries = msg->remote_nentries;
+		args->local_nentries = msg->local_nentries;
+		args->local_msgqueue_pa = msg->notify_gru_mq_desc_gpa;
+
+		spin_lock_irqsave(&part->chctl_lock, irq_flags);
+		part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREPLY;
+		spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
+
+		xpc_wakeup_channel_mgr(part);
+		break;
+	}
+	case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV: {
+		struct xpc_activate_mq_msg_chctl_opencomplete_uv *msg;
+
+		if (!part_setup)
+			break;
+
+		msg = container_of(msg_hdr, struct
+				xpc_activate_mq_msg_chctl_opencomplete_uv, hdr);
+		spin_lock_irqsave(&part->chctl_lock, irq_flags);
+		part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENCOMPLETE;
+		spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
+
+		xpc_wakeup_channel_mgr(part);
+	}
+		fallthrough;
+	case XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV:
+		spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
+		part_uv->flags |= XPC_P_ENGAGED_UV;
+		spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
+		break;
+
+	case XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV:
+		spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
+		part_uv->flags &= ~XPC_P_ENGAGED_UV;
+		spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
+		break;
+
+	default:
+		dev_err(xpc_part, "received unknown activate_mq msg type=%d "
+			"from partition=%d\n", msg_hdr->type, XPC_PARTID(part));
+
+		/* get hb checker to deactivate from the remote partition */
+		spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+		if (part_uv->act_state_req == 0)
+			xpc_activate_IRQ_rcvd++;
+		part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
+		part_uv->reason = xpBadMsgType;
+		spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+
+		(*wakeup_hb_checker)++;
+		return;
+	}
+
+	if (msg_hdr->rp_ts_jiffies != part->remote_rp_ts_jiffies &&
+	    part->remote_rp_ts_jiffies != 0) {
+		/*
+		 * ??? Does what we do here need to be sensitive to
+		 * ??? act_state or remote_act_state?
+		 */
+		spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+		if (part_uv->act_state_req == 0)
+			xpc_activate_IRQ_rcvd++;
+		part_uv->act_state_req = XPC_P_ASR_REACTIVATE_UV;
+		spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+
+		(*wakeup_hb_checker)++;
+	}
+}
+
+static irqreturn_t
+xpc_handle_activate_IRQ_uv(int irq, void *dev_id)
+{
+	struct xpc_activate_mq_msghdr_uv *msg_hdr;
+	short partid;
+	struct xpc_partition *part;
+	int wakeup_hb_checker = 0;
+	int part_referenced;
+
+	while (1) {
+		msg_hdr = gru_get_next_message(xpc_activate_mq_uv->gru_mq_desc);
+		if (msg_hdr == NULL)
+			break;
+
+		partid = msg_hdr->partid;
+		if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
+			dev_err(xpc_part, "xpc_handle_activate_IRQ_uv() "
+				"received invalid partid=0x%x in message\n",
+				partid);
+		} else {
+			part = &xpc_partitions[partid];
+
+			part_referenced = xpc_part_ref(part);
+			xpc_handle_activate_mq_msg_uv(part, msg_hdr,
+						      part_referenced,
+						      &wakeup_hb_checker);
+			if (part_referenced)
+				xpc_part_deref(part);
+		}
+
+		gru_free_message(xpc_activate_mq_uv->gru_mq_desc, msg_hdr);
+	}
+
+	if (wakeup_hb_checker)
+		wake_up_interruptible(&xpc_activate_IRQ_wq);
+
+	return IRQ_HANDLED;
+}
+
+static enum xp_retval
+xpc_cache_remote_gru_mq_desc_uv(struct gru_message_queue_desc *gru_mq_desc,
+				unsigned long gru_mq_desc_gpa)
+{
+	enum xp_retval ret;
+
+	ret = xp_remote_memcpy(uv_gpa(gru_mq_desc), gru_mq_desc_gpa,
+			       sizeof(struct gru_message_queue_desc));
+	if (ret == xpSuccess)
+		gru_mq_desc->mq = NULL;
+
+	return ret;
+}
+
+static enum xp_retval
+xpc_send_activate_IRQ_uv(struct xpc_partition *part, void *msg, size_t msg_size,
+			 int msg_type)
+{
+	struct xpc_activate_mq_msghdr_uv *msg_hdr = msg;
+	struct xpc_partition_uv *part_uv = &part->sn.uv;
+	struct gru_message_queue_desc *gru_mq_desc;
+	unsigned long irq_flags;
+	enum xp_retval ret;
+
+	DBUG_ON(msg_size > XPC_ACTIVATE_MSG_SIZE_UV);
+
+	msg_hdr->type = msg_type;
+	msg_hdr->partid = xp_partition_id;
+	msg_hdr->act_state = part->act_state;
+	msg_hdr->rp_ts_jiffies = xpc_rsvd_page->ts_jiffies;
+
+	mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
+again:
+	if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV)) {
+		gru_mq_desc = part_uv->cached_activate_gru_mq_desc;
+		if (gru_mq_desc == NULL) {
+			gru_mq_desc = kmalloc(sizeof(struct
+					      gru_message_queue_desc),
+					      GFP_ATOMIC);
+			if (gru_mq_desc == NULL) {
+				ret = xpNoMemory;
+				goto done;
+			}
+			part_uv->cached_activate_gru_mq_desc = gru_mq_desc;
+		}
+
+		ret = xpc_cache_remote_gru_mq_desc_uv(gru_mq_desc,
+						      part_uv->
+						      activate_gru_mq_desc_gpa);
+		if (ret != xpSuccess)
+			goto done;
+
+		spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
+		part_uv->flags |= XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
+		spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
+	}
+
+	/* ??? Is holding a spin_lock (ch->lock) during this call a bad idea? */
+	ret = xpc_send_gru_msg(part_uv->cached_activate_gru_mq_desc, msg,
+			       msg_size);
+	if (ret != xpSuccess) {
+		smp_rmb();	/* ensure a fresh copy of part_uv->flags */
+		if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV))
+			goto again;
+	}
+done:
+	mutex_unlock(&part_uv->cached_activate_gru_mq_desc_mutex);
+	return ret;
+}
+
+static void
+xpc_send_activate_IRQ_part_uv(struct xpc_partition *part, void *msg,
+			      size_t msg_size, int msg_type)
+{
+	enum xp_retval ret;
+
+	ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
+	if (unlikely(ret != xpSuccess))
+		XPC_DEACTIVATE_PARTITION(part, ret);
+}
+
+static void
+xpc_send_activate_IRQ_ch_uv(struct xpc_channel *ch, unsigned long *irq_flags,
+			 void *msg, size_t msg_size, int msg_type)
+{
+	struct xpc_partition *part = &xpc_partitions[ch->partid];
+	enum xp_retval ret;
+
+	ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
+	if (unlikely(ret != xpSuccess)) {
+		if (irq_flags != NULL)
+			spin_unlock_irqrestore(&ch->lock, *irq_flags);
+
+		XPC_DEACTIVATE_PARTITION(part, ret);
+
+		if (irq_flags != NULL)
+			spin_lock_irqsave(&ch->lock, *irq_flags);
+	}
+}
+
+static void
+xpc_send_local_activate_IRQ_uv(struct xpc_partition *part, int act_state_req)
+{
+	unsigned long irq_flags;
+	struct xpc_partition_uv *part_uv = &part->sn.uv;
+
+	/*
+	 * !!! Make our side think that the remote partition sent an activate
+	 * !!! mq message our way by doing what the activate IRQ handler would
+	 * !!! do had one really been sent.
+	 */
+
+	spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+	if (part_uv->act_state_req == 0)
+		xpc_activate_IRQ_rcvd++;
+	part_uv->act_state_req = act_state_req;
+	spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+
+	wake_up_interruptible(&xpc_activate_IRQ_wq);
+}
+
+static enum xp_retval
+xpc_get_partition_rsvd_page_pa_uv(void *buf, u64 *cookie, unsigned long *rp_pa,
+				  size_t *len)
+{
+	s64 status;
+	enum xp_retval ret;
+
+#if defined CONFIG_X86_64
+	status = uv_bios_reserved_page_pa((u64)buf, cookie, (u64 *)rp_pa,
+					  (u64 *)len);
+	if (status == BIOS_STATUS_SUCCESS)
+		ret = xpSuccess;
+	else if (status == BIOS_STATUS_MORE_PASSES)
+		ret = xpNeedMoreInfo;
+	else
+		ret = xpBiosError;
+
+#elif defined CONFIG_IA64_SGI_UV
+	status = sn_partition_reserved_page_pa((u64)buf, cookie, rp_pa, len);
+	if (status == SALRET_OK)
+		ret = xpSuccess;
+	else if (status == SALRET_MORE_PASSES)
+		ret = xpNeedMoreInfo;
+	else
+		ret = xpSalError;
+
+#else
+	#error not a supported configuration
+#endif
+
+	return ret;
+}
+
+static int
+xpc_setup_rsvd_page_uv(struct xpc_rsvd_page *rp)
+{
+	xpc_heartbeat_uv =
+	    &xpc_partitions[sn_partition_id].sn.uv.cached_heartbeat;
+	rp->sn.uv.heartbeat_gpa = uv_gpa(xpc_heartbeat_uv);
+	rp->sn.uv.activate_gru_mq_desc_gpa =
+	    uv_gpa(xpc_activate_mq_uv->gru_mq_desc);
+	return 0;
+}
+
+static void
+xpc_allow_hb_uv(short partid)
+{
+}
+
+static void
+xpc_disallow_hb_uv(short partid)
+{
+}
+
+static void
+xpc_disallow_all_hbs_uv(void)
+{
+}
+
+static void
+xpc_increment_heartbeat_uv(void)
+{
+	xpc_heartbeat_uv->value++;
+}
+
+static void
+xpc_offline_heartbeat_uv(void)
+{
+	xpc_increment_heartbeat_uv();
+	xpc_heartbeat_uv->offline = 1;
+}
+
+static void
+xpc_online_heartbeat_uv(void)
+{
+	xpc_increment_heartbeat_uv();
+	xpc_heartbeat_uv->offline = 0;
+}
+
+static void
+xpc_heartbeat_init_uv(void)
+{
+	xpc_heartbeat_uv->value = 1;
+	xpc_heartbeat_uv->offline = 0;
+}
+
+static void
+xpc_heartbeat_exit_uv(void)
+{
+	xpc_offline_heartbeat_uv();
+}
+
+static enum xp_retval
+xpc_get_remote_heartbeat_uv(struct xpc_partition *part)
+{
+	struct xpc_partition_uv *part_uv = &part->sn.uv;
+	enum xp_retval ret;
+
+	ret = xp_remote_memcpy(uv_gpa(&part_uv->cached_heartbeat),
+			       part_uv->heartbeat_gpa,
+			       sizeof(struct xpc_heartbeat_uv));
+	if (ret != xpSuccess)
+		return ret;
+
+	if (part_uv->cached_heartbeat.value == part->last_heartbeat &&
+	    !part_uv->cached_heartbeat.offline) {
+
+		ret = xpNoHeartbeat;
+	} else {
+		part->last_heartbeat = part_uv->cached_heartbeat.value;
+	}
+	return ret;
+}
+
+static void
+xpc_request_partition_activation_uv(struct xpc_rsvd_page *remote_rp,
+				    unsigned long remote_rp_gpa, int nasid)
+{
+	short partid = remote_rp->SAL_partid;
+	struct xpc_partition *part = &xpc_partitions[partid];
+	struct xpc_activate_mq_msg_activate_req_uv msg;
+
+	part->remote_rp_pa = remote_rp_gpa; /* !!! _pa here is really _gpa */
+	part->remote_rp_ts_jiffies = remote_rp->ts_jiffies;
+	part->sn.uv.heartbeat_gpa = remote_rp->sn.uv.heartbeat_gpa;
+	part->sn.uv.activate_gru_mq_desc_gpa =
+	    remote_rp->sn.uv.activate_gru_mq_desc_gpa;
+
+	/*
+	 * ??? Is it a good idea to make this conditional on what is
+	 * ??? potentially stale state information?
+	 */
+	if (part->sn.uv.remote_act_state == XPC_P_AS_INACTIVE) {
+		msg.rp_gpa = uv_gpa(xpc_rsvd_page);
+		msg.heartbeat_gpa = xpc_rsvd_page->sn.uv.heartbeat_gpa;
+		msg.activate_gru_mq_desc_gpa =
+		    xpc_rsvd_page->sn.uv.activate_gru_mq_desc_gpa;
+		xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
+					   XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV);
+	}
+
+	if (part->act_state == XPC_P_AS_INACTIVE)
+		xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
+}
+
+static void
+xpc_request_partition_reactivation_uv(struct xpc_partition *part)
+{
+	xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
+}
+
+static void
+xpc_request_partition_deactivation_uv(struct xpc_partition *part)
+{
+	struct xpc_activate_mq_msg_deactivate_req_uv msg;
+
+	/*
+	 * ??? Is it a good idea to make this conditional on what is
+	 * ??? potentially stale state information?
+	 */
+	if (part->sn.uv.remote_act_state != XPC_P_AS_DEACTIVATING &&
+	    part->sn.uv.remote_act_state != XPC_P_AS_INACTIVE) {
+
+		msg.reason = part->reason;
+		xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
+					 XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV);
+	}
+}
+
+static void
+xpc_cancel_partition_deactivation_request_uv(struct xpc_partition *part)
+{
+	/* nothing needs to be done */
+	return;
+}
+
+static void
+xpc_init_fifo_uv(struct xpc_fifo_head_uv *head)
+{
+	head->first = NULL;
+	head->last = NULL;
+	spin_lock_init(&head->lock);
+	head->n_entries = 0;
+}
+
+static void *
+xpc_get_fifo_entry_uv(struct xpc_fifo_head_uv *head)
+{
+	unsigned long irq_flags;
+	struct xpc_fifo_entry_uv *first;
+
+	spin_lock_irqsave(&head->lock, irq_flags);
+	first = head->first;
+	if (head->first != NULL) {
+		head->first = first->next;
+		if (head->first == NULL)
+			head->last = NULL;
+
+		head->n_entries--;
+		BUG_ON(head->n_entries < 0);
+
+		first->next = NULL;
+	}
+	spin_unlock_irqrestore(&head->lock, irq_flags);
+	return first;
+}
+
+static void
+xpc_put_fifo_entry_uv(struct xpc_fifo_head_uv *head,
+		      struct xpc_fifo_entry_uv *last)
+{
+	unsigned long irq_flags;
+
+	last->next = NULL;
+	spin_lock_irqsave(&head->lock, irq_flags);
+	if (head->last != NULL)
+		head->last->next = last;
+	else
+		head->first = last;
+	head->last = last;
+	head->n_entries++;
+	spin_unlock_irqrestore(&head->lock, irq_flags);
+}
+
+static int
+xpc_n_of_fifo_entries_uv(struct xpc_fifo_head_uv *head)
+{
+	return head->n_entries;
+}
+
+/*
+ * Setup the channel structures that are uv specific.
+ */
+static enum xp_retval
+xpc_setup_ch_structures_uv(struct xpc_partition *part)
+{
+	struct xpc_channel_uv *ch_uv;
+	int ch_number;
+
+	for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
+		ch_uv = &part->channels[ch_number].sn.uv;
+
+		xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
+		xpc_init_fifo_uv(&ch_uv->recv_msg_list);
+	}
+
+	return xpSuccess;
+}
+
+/*
+ * Teardown the channel structures that are uv specific.
+ */
+static void
+xpc_teardown_ch_structures_uv(struct xpc_partition *part)
+{
+	/* nothing needs to be done */
+	return;
+}
+
+static enum xp_retval
+xpc_make_first_contact_uv(struct xpc_partition *part)
+{
+	struct xpc_activate_mq_msg_uv msg;
+
+	/*
+	 * We send a sync msg to get the remote partition's remote_act_state
+	 * updated to our current act_state which at this point should
+	 * be XPC_P_AS_ACTIVATING.
+	 */
+	xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
+				      XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV);
+
+	while (!((part->sn.uv.remote_act_state == XPC_P_AS_ACTIVATING) ||
+		 (part->sn.uv.remote_act_state == XPC_P_AS_ACTIVE))) {
+
+		dev_dbg(xpc_part, "waiting to make first contact with "
+			"partition %d\n", XPC_PARTID(part));
+
+		/* wait a 1/4 of a second or so */
+		(void)msleep_interruptible(250);
+
+		if (part->act_state == XPC_P_AS_DEACTIVATING)
+			return part->reason;
+	}
+
+	return xpSuccess;
+}
+
+static u64
+xpc_get_chctl_all_flags_uv(struct xpc_partition *part)
+{
+	unsigned long irq_flags;
+	union xpc_channel_ctl_flags chctl;
+
+	spin_lock_irqsave(&part->chctl_lock, irq_flags);
+	chctl = part->chctl;
+	if (chctl.all_flags != 0)
+		part->chctl.all_flags = 0;
+
+	spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
+	return chctl.all_flags;
+}
+
+static enum xp_retval
+xpc_allocate_send_msg_slot_uv(struct xpc_channel *ch)
+{
+	struct xpc_channel_uv *ch_uv = &ch->sn.uv;
+	struct xpc_send_msg_slot_uv *msg_slot;
+	unsigned long irq_flags;
+	int nentries;
+	int entry;
+	size_t nbytes;
+
+	for (nentries = ch->local_nentries; nentries > 0; nentries--) {
+		nbytes = nentries * sizeof(struct xpc_send_msg_slot_uv);
+		ch_uv->send_msg_slots = kzalloc(nbytes, GFP_KERNEL);
+		if (ch_uv->send_msg_slots == NULL)
+			continue;
+
+		for (entry = 0; entry < nentries; entry++) {
+			msg_slot = &ch_uv->send_msg_slots[entry];
+
+			msg_slot->msg_slot_number = entry;
+			xpc_put_fifo_entry_uv(&ch_uv->msg_slot_free_list,
+					      &msg_slot->next);
+		}
+
+		spin_lock_irqsave(&ch->lock, irq_flags);
+		if (nentries < ch->local_nentries)
+			ch->local_nentries = nentries;
+		spin_unlock_irqrestore(&ch->lock, irq_flags);
+		return xpSuccess;
+	}
+
+	return xpNoMemory;
+}
+
+static enum xp_retval
+xpc_allocate_recv_msg_slot_uv(struct xpc_channel *ch)
+{
+	struct xpc_channel_uv *ch_uv = &ch->sn.uv;
+	struct xpc_notify_mq_msg_uv *msg_slot;
+	unsigned long irq_flags;
+	int nentries;
+	int entry;
+	size_t nbytes;
+
+	for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
+		nbytes = nentries * ch->entry_size;
+		ch_uv->recv_msg_slots = kzalloc(nbytes, GFP_KERNEL);
+		if (ch_uv->recv_msg_slots == NULL)
+			continue;
+
+		for (entry = 0; entry < nentries; entry++) {
+			msg_slot = ch_uv->recv_msg_slots +
+			    entry * ch->entry_size;
+
+			msg_slot->hdr.msg_slot_number = entry;
+		}
+
+		spin_lock_irqsave(&ch->lock, irq_flags);
+		if (nentries < ch->remote_nentries)
+			ch->remote_nentries = nentries;
+		spin_unlock_irqrestore(&ch->lock, irq_flags);
+		return xpSuccess;
+	}
+
+	return xpNoMemory;
+}
+
+/*
+ * Allocate msg_slots associated with the channel.
+ */
+static enum xp_retval
+xpc_setup_msg_structures_uv(struct xpc_channel *ch)
+{
+	static enum xp_retval ret;
+	struct xpc_channel_uv *ch_uv = &ch->sn.uv;
+
+	DBUG_ON(ch->flags & XPC_C_SETUP);
+
+	ch_uv->cached_notify_gru_mq_desc = kmalloc(sizeof(struct
+						   gru_message_queue_desc),
+						   GFP_KERNEL);
+	if (ch_uv->cached_notify_gru_mq_desc == NULL)
+		return xpNoMemory;
+
+	ret = xpc_allocate_send_msg_slot_uv(ch);
+	if (ret == xpSuccess) {
+
+		ret = xpc_allocate_recv_msg_slot_uv(ch);
+		if (ret != xpSuccess) {
+			kfree(ch_uv->send_msg_slots);
+			xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
+		}
+	}
+	return ret;
+}
+
+/*
+ * Free up msg_slots and clear other stuff that were setup for the specified
+ * channel.
+ */
+static void
+xpc_teardown_msg_structures_uv(struct xpc_channel *ch)
+{
+	struct xpc_channel_uv *ch_uv = &ch->sn.uv;
+
+	lockdep_assert_held(&ch->lock);
+
+	kfree(ch_uv->cached_notify_gru_mq_desc);
+	ch_uv->cached_notify_gru_mq_desc = NULL;
+
+	if (ch->flags & XPC_C_SETUP) {
+		xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
+		kfree(ch_uv->send_msg_slots);
+		xpc_init_fifo_uv(&ch_uv->recv_msg_list);
+		kfree(ch_uv->recv_msg_slots);
+	}
+}
+
+static void
+xpc_send_chctl_closerequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+	struct xpc_activate_mq_msg_chctl_closerequest_uv msg;
+
+	msg.ch_number = ch->number;
+	msg.reason = ch->reason;
+	xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
+				    XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV);
+}
+
+static void
+xpc_send_chctl_closereply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+	struct xpc_activate_mq_msg_chctl_closereply_uv msg;
+
+	msg.ch_number = ch->number;
+	xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
+				    XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV);
+}
+
+static void
+xpc_send_chctl_openrequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+	struct xpc_activate_mq_msg_chctl_openrequest_uv msg;
+
+	msg.ch_number = ch->number;
+	msg.entry_size = ch->entry_size;
+	msg.local_nentries = ch->local_nentries;
+	xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
+				    XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV);
+}
+
+static void
+xpc_send_chctl_openreply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+	struct xpc_activate_mq_msg_chctl_openreply_uv msg;
+
+	msg.ch_number = ch->number;
+	msg.local_nentries = ch->local_nentries;
+	msg.remote_nentries = ch->remote_nentries;
+	msg.notify_gru_mq_desc_gpa = uv_gpa(xpc_notify_mq_uv->gru_mq_desc);
+	xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
+				    XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV);
+}
+
+static void
+xpc_send_chctl_opencomplete_uv(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+	struct xpc_activate_mq_msg_chctl_opencomplete_uv msg;
+
+	msg.ch_number = ch->number;
+	xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
+				    XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV);
+}
+
+static void
+xpc_send_chctl_local_msgrequest_uv(struct xpc_partition *part, int ch_number)
+{
+	unsigned long irq_flags;
+
+	spin_lock_irqsave(&part->chctl_lock, irq_flags);
+	part->chctl.flags[ch_number] |= XPC_CHCTL_MSGREQUEST;
+	spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
+
+	xpc_wakeup_channel_mgr(part);
+}
+
+static enum xp_retval
+xpc_save_remote_msgqueue_pa_uv(struct xpc_channel *ch,
+			       unsigned long gru_mq_desc_gpa)
+{
+	struct xpc_channel_uv *ch_uv = &ch->sn.uv;
+
+	DBUG_ON(ch_uv->cached_notify_gru_mq_desc == NULL);
+	return xpc_cache_remote_gru_mq_desc_uv(ch_uv->cached_notify_gru_mq_desc,
+					       gru_mq_desc_gpa);
+}
+
+static void
+xpc_indicate_partition_engaged_uv(struct xpc_partition *part)
+{
+	struct xpc_activate_mq_msg_uv msg;
+
+	xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
+				      XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV);
+}
+
+static void
+xpc_indicate_partition_disengaged_uv(struct xpc_partition *part)
+{
+	struct xpc_activate_mq_msg_uv msg;
+
+	xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
+				      XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV);
+}
+
+static void
+xpc_assume_partition_disengaged_uv(short partid)
+{
+	struct xpc_partition_uv *part_uv = &xpc_partitions[partid].sn.uv;
+	unsigned long irq_flags;
+
+	spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
+	part_uv->flags &= ~XPC_P_ENGAGED_UV;
+	spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
+}
+
+static int
+xpc_partition_engaged_uv(short partid)
+{
+	return (xpc_partitions[partid].sn.uv.flags & XPC_P_ENGAGED_UV) != 0;
+}
+
+static int
+xpc_any_partition_engaged_uv(void)
+{
+	struct xpc_partition_uv *part_uv;
+	short partid;
+
+	for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
+		part_uv = &xpc_partitions[partid].sn.uv;
+		if ((part_uv->flags & XPC_P_ENGAGED_UV) != 0)
+			return 1;
+	}
+	return 0;
+}
+
+static enum xp_retval
+xpc_allocate_msg_slot_uv(struct xpc_channel *ch, u32 flags,
+			 struct xpc_send_msg_slot_uv **address_of_msg_slot)
+{
+	enum xp_retval ret;
+	struct xpc_send_msg_slot_uv *msg_slot;
+	struct xpc_fifo_entry_uv *entry;
+
+	while (1) {
+		entry = xpc_get_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list);
+		if (entry != NULL)
+			break;
+
+		if (flags & XPC_NOWAIT)
+			return xpNoWait;
+
+		ret = xpc_allocate_msg_wait(ch);
+		if (ret != xpInterrupted && ret != xpTimeout)
+			return ret;
+	}
+
+	msg_slot = container_of(entry, struct xpc_send_msg_slot_uv, next);
+	*address_of_msg_slot = msg_slot;
+	return xpSuccess;
+}
+
+static void
+xpc_free_msg_slot_uv(struct xpc_channel *ch,
+		     struct xpc_send_msg_slot_uv *msg_slot)
+{
+	xpc_put_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list, &msg_slot->next);
+
+	/* wakeup anyone waiting for a free msg slot */
+	if (atomic_read(&ch->n_on_msg_allocate_wq) > 0)
+		wake_up(&ch->msg_allocate_wq);
+}
+
+static void
+xpc_notify_sender_uv(struct xpc_channel *ch,
+		     struct xpc_send_msg_slot_uv *msg_slot,
+		     enum xp_retval reason)
+{
+	xpc_notify_func func = msg_slot->func;
+
+	if (func != NULL && cmpxchg(&msg_slot->func, func, NULL) == func) {
+
+		atomic_dec(&ch->n_to_notify);
+
+		dev_dbg(xpc_chan, "msg_slot->func() called, msg_slot=0x%p "
+			"msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
+			msg_slot->msg_slot_number, ch->partid, ch->number);
+
+		func(reason, ch->partid, ch->number, msg_slot->key);
+
+		dev_dbg(xpc_chan, "msg_slot->func() returned, msg_slot=0x%p "
+			"msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
+			msg_slot->msg_slot_number, ch->partid, ch->number);
+	}
+}
+
+static void
+xpc_handle_notify_mq_ack_uv(struct xpc_channel *ch,
+			    struct xpc_notify_mq_msg_uv *msg)
+{
+	struct xpc_send_msg_slot_uv *msg_slot;
+	int entry = msg->hdr.msg_slot_number % ch->local_nentries;
+
+	msg_slot = &ch->sn.uv.send_msg_slots[entry];
+
+	BUG_ON(msg_slot->msg_slot_number != msg->hdr.msg_slot_number);
+	msg_slot->msg_slot_number += ch->local_nentries;
+
+	if (msg_slot->func != NULL)
+		xpc_notify_sender_uv(ch, msg_slot, xpMsgDelivered);
+
+	xpc_free_msg_slot_uv(ch, msg_slot);
+}
+
+static void
+xpc_handle_notify_mq_msg_uv(struct xpc_partition *part,
+			    struct xpc_notify_mq_msg_uv *msg)
+{
+	struct xpc_partition_uv *part_uv = &part->sn.uv;
+	struct xpc_channel *ch;
+	struct xpc_channel_uv *ch_uv;
+	struct xpc_notify_mq_msg_uv *msg_slot;
+	unsigned long irq_flags;
+	int ch_number = msg->hdr.ch_number;
+
+	if (unlikely(ch_number >= part->nchannels)) {
+		dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received invalid "
+			"channel number=0x%x in message from partid=%d\n",
+			ch_number, XPC_PARTID(part));
+
+		/* get hb checker to deactivate from the remote partition */
+		spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+		if (part_uv->act_state_req == 0)
+			xpc_activate_IRQ_rcvd++;
+		part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
+		part_uv->reason = xpBadChannelNumber;
+		spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
+
+		wake_up_interruptible(&xpc_activate_IRQ_wq);
+		return;
+	}
+
+	ch = &part->channels[ch_number];
+	xpc_msgqueue_ref(ch);
+
+	if (!(ch->flags & XPC_C_CONNECTED)) {
+		xpc_msgqueue_deref(ch);
+		return;
+	}
+
+	/* see if we're really dealing with an ACK for a previously sent msg */
+	if (msg->hdr.size == 0) {
+		xpc_handle_notify_mq_ack_uv(ch, msg);
+		xpc_msgqueue_deref(ch);
+		return;
+	}
+
+	/* we're dealing with a normal message sent via the notify_mq */
+	ch_uv = &ch->sn.uv;
+
+	msg_slot = ch_uv->recv_msg_slots +
+	    (msg->hdr.msg_slot_number % ch->remote_nentries) * ch->entry_size;
+
+	BUG_ON(msg_slot->hdr.size != 0);
+
+	memcpy(msg_slot, msg, msg->hdr.size);
+
+	xpc_put_fifo_entry_uv(&ch_uv->recv_msg_list, &msg_slot->hdr.u.next);
+
+	if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) {
+		/*
+		 * If there is an existing idle kthread get it to deliver
+		 * the payload, otherwise we'll have to get the channel mgr
+		 * for this partition to create a kthread to do the delivery.
+		 */
+		if (atomic_read(&ch->kthreads_idle) > 0)
+			wake_up_nr(&ch->idle_wq, 1);
+		else
+			xpc_send_chctl_local_msgrequest_uv(part, ch->number);
+	}
+	xpc_msgqueue_deref(ch);
+}
+
+static irqreturn_t
+xpc_handle_notify_IRQ_uv(int irq, void *dev_id)
+{
+	struct xpc_notify_mq_msg_uv *msg;
+	short partid;
+	struct xpc_partition *part;
+
+	while ((msg = gru_get_next_message(xpc_notify_mq_uv->gru_mq_desc)) !=
+	       NULL) {
+
+		partid = msg->hdr.partid;
+		if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
+			dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received "
+				"invalid partid=0x%x in message\n", partid);
+		} else {
+			part = &xpc_partitions[partid];
+
+			if (xpc_part_ref(part)) {
+				xpc_handle_notify_mq_msg_uv(part, msg);
+				xpc_part_deref(part);
+			}
+		}
+
+		gru_free_message(xpc_notify_mq_uv->gru_mq_desc, msg);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int
+xpc_n_of_deliverable_payloads_uv(struct xpc_channel *ch)
+{
+	return xpc_n_of_fifo_entries_uv(&ch->sn.uv.recv_msg_list);
+}
+
+static void
+xpc_process_msg_chctl_flags_uv(struct xpc_partition *part, int ch_number)
+{
+	struct xpc_channel *ch = &part->channels[ch_number];
+	int ndeliverable_payloads;
+
+	xpc_msgqueue_ref(ch);
+
+	ndeliverable_payloads = xpc_n_of_deliverable_payloads_uv(ch);
+
+	if (ndeliverable_payloads > 0 &&
+	    (ch->flags & XPC_C_CONNECTED) &&
+	    (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE)) {
+
+		xpc_activate_kthreads(ch, ndeliverable_payloads);
+	}
+
+	xpc_msgqueue_deref(ch);
+}
+
+static enum xp_retval
+xpc_send_payload_uv(struct xpc_channel *ch, u32 flags, void *payload,
+		    u16 payload_size, u8 notify_type, xpc_notify_func func,
+		    void *key)
+{
+	enum xp_retval ret = xpSuccess;
+	struct xpc_send_msg_slot_uv *msg_slot = NULL;
+	struct xpc_notify_mq_msg_uv *msg;
+	u8 msg_buffer[XPC_NOTIFY_MSG_SIZE_UV];
+	size_t msg_size;
+
+	DBUG_ON(notify_type != XPC_N_CALL);
+
+	msg_size = sizeof(struct xpc_notify_mq_msghdr_uv) + payload_size;
+	if (msg_size > ch->entry_size)
+		return xpPayloadTooBig;
+
+	xpc_msgqueue_ref(ch);
+
+	if (ch->flags & XPC_C_DISCONNECTING) {
+		ret = ch->reason;
+		goto out_1;
+	}
+	if (!(ch->flags & XPC_C_CONNECTED)) {
+		ret = xpNotConnected;
+		goto out_1;
+	}
+
+	ret = xpc_allocate_msg_slot_uv(ch, flags, &msg_slot);
+	if (ret != xpSuccess)
+		goto out_1;
+
+	if (func != NULL) {
+		atomic_inc(&ch->n_to_notify);
+
+		msg_slot->key = key;
+		smp_wmb(); /* a non-NULL func must hit memory after the key */
+		msg_slot->func = func;
+
+		if (ch->flags & XPC_C_DISCONNECTING) {
+			ret = ch->reason;
+			goto out_2;
+		}
+	}
+
+	msg = (struct xpc_notify_mq_msg_uv *)&msg_buffer;
+	msg->hdr.partid = xp_partition_id;
+	msg->hdr.ch_number = ch->number;
+	msg->hdr.size = msg_size;
+	msg->hdr.msg_slot_number = msg_slot->msg_slot_number;
+	memcpy(&msg->payload, payload, payload_size);
+
+	ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
+			       msg_size);
+	if (ret == xpSuccess)
+		goto out_1;
+
+	XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
+out_2:
+	if (func != NULL) {
+		/*
+		 * Try to NULL the msg_slot's func field. If we fail, then
+		 * xpc_notify_senders_of_disconnect_uv() beat us to it, in which
+		 * case we need to pretend we succeeded to send the message
+		 * since the user will get a callout for the disconnect error
+		 * by xpc_notify_senders_of_disconnect_uv(), and to also get an
+		 * error returned here will confuse them. Additionally, since
+		 * in this case the channel is being disconnected we don't need
+		 * to put the the msg_slot back on the free list.
+		 */
+		if (cmpxchg(&msg_slot->func, func, NULL) != func) {
+			ret = xpSuccess;
+			goto out_1;
+		}
+
+		msg_slot->key = NULL;
+		atomic_dec(&ch->n_to_notify);
+	}
+	xpc_free_msg_slot_uv(ch, msg_slot);
+out_1:
+	xpc_msgqueue_deref(ch);
+	return ret;
+}
+
+/*
+ * Tell the callers of xpc_send_notify() that the status of their payloads
+ * is unknown because the channel is now disconnecting.
+ *
+ * We don't worry about putting these msg_slots on the free list since the
+ * msg_slots themselves are about to be kfree'd.
+ */
+static void
+xpc_notify_senders_of_disconnect_uv(struct xpc_channel *ch)
+{
+	struct xpc_send_msg_slot_uv *msg_slot;
+	int entry;
+
+	DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING));
+
+	for (entry = 0; entry < ch->local_nentries; entry++) {
+
+		if (atomic_read(&ch->n_to_notify) == 0)
+			break;
+
+		msg_slot = &ch->sn.uv.send_msg_slots[entry];
+		if (msg_slot->func != NULL)
+			xpc_notify_sender_uv(ch, msg_slot, ch->reason);
+	}
+}
+
+/*
+ * Get the next deliverable message's payload.
+ */
+static void *
+xpc_get_deliverable_payload_uv(struct xpc_channel *ch)
+{
+	struct xpc_fifo_entry_uv *entry;
+	struct xpc_notify_mq_msg_uv *msg;
+	void *payload = NULL;
+
+	if (!(ch->flags & XPC_C_DISCONNECTING)) {
+		entry = xpc_get_fifo_entry_uv(&ch->sn.uv.recv_msg_list);
+		if (entry != NULL) {
+			msg = container_of(entry, struct xpc_notify_mq_msg_uv,
+					   hdr.u.next);
+			payload = &msg->payload;
+		}
+	}
+	return payload;
+}
+
+static void
+xpc_received_payload_uv(struct xpc_channel *ch, void *payload)
+{
+	struct xpc_notify_mq_msg_uv *msg;
+	enum xp_retval ret;
+
+	msg = container_of(payload, struct xpc_notify_mq_msg_uv, payload);
+
+	/* return an ACK to the sender of this message */
+
+	msg->hdr.partid = xp_partition_id;
+	msg->hdr.size = 0;	/* size of zero indicates this is an ACK */
+
+	ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
+			       sizeof(struct xpc_notify_mq_msghdr_uv));
+	if (ret != xpSuccess)
+		XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
+}
+
+static const struct xpc_arch_operations xpc_arch_ops_uv = {
+	.setup_partitions = xpc_setup_partitions_uv,
+	.teardown_partitions = xpc_teardown_partitions_uv,
+	.process_activate_IRQ_rcvd = xpc_process_activate_IRQ_rcvd_uv,
+	.get_partition_rsvd_page_pa = xpc_get_partition_rsvd_page_pa_uv,
+	.setup_rsvd_page = xpc_setup_rsvd_page_uv,
+
+	.allow_hb = xpc_allow_hb_uv,
+	.disallow_hb = xpc_disallow_hb_uv,
+	.disallow_all_hbs = xpc_disallow_all_hbs_uv,
+	.increment_heartbeat = xpc_increment_heartbeat_uv,
+	.offline_heartbeat = xpc_offline_heartbeat_uv,
+	.online_heartbeat = xpc_online_heartbeat_uv,
+	.heartbeat_init = xpc_heartbeat_init_uv,
+	.heartbeat_exit = xpc_heartbeat_exit_uv,
+	.get_remote_heartbeat = xpc_get_remote_heartbeat_uv,
+
+	.request_partition_activation =
+		xpc_request_partition_activation_uv,
+	.request_partition_reactivation =
+		xpc_request_partition_reactivation_uv,
+	.request_partition_deactivation =
+		xpc_request_partition_deactivation_uv,
+	.cancel_partition_deactivation_request =
+		xpc_cancel_partition_deactivation_request_uv,
+
+	.setup_ch_structures = xpc_setup_ch_structures_uv,
+	.teardown_ch_structures = xpc_teardown_ch_structures_uv,
+
+	.make_first_contact = xpc_make_first_contact_uv,
+
+	.get_chctl_all_flags = xpc_get_chctl_all_flags_uv,
+	.send_chctl_closerequest = xpc_send_chctl_closerequest_uv,
+	.send_chctl_closereply = xpc_send_chctl_closereply_uv,
+	.send_chctl_openrequest = xpc_send_chctl_openrequest_uv,
+	.send_chctl_openreply = xpc_send_chctl_openreply_uv,
+	.send_chctl_opencomplete = xpc_send_chctl_opencomplete_uv,
+	.process_msg_chctl_flags = xpc_process_msg_chctl_flags_uv,
+
+	.save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_uv,
+
+	.setup_msg_structures = xpc_setup_msg_structures_uv,
+	.teardown_msg_structures = xpc_teardown_msg_structures_uv,
+
+	.indicate_partition_engaged = xpc_indicate_partition_engaged_uv,
+	.indicate_partition_disengaged = xpc_indicate_partition_disengaged_uv,
+	.assume_partition_disengaged = xpc_assume_partition_disengaged_uv,
+	.partition_engaged = xpc_partition_engaged_uv,
+	.any_partition_engaged = xpc_any_partition_engaged_uv,
+
+	.n_of_deliverable_payloads = xpc_n_of_deliverable_payloads_uv,
+	.send_payload = xpc_send_payload_uv,
+	.get_deliverable_payload = xpc_get_deliverable_payload_uv,
+	.received_payload = xpc_received_payload_uv,
+	.notify_senders_of_disconnect = xpc_notify_senders_of_disconnect_uv,
+};
+
+static int
+xpc_init_mq_node(int nid)
+{
+	int cpu;
+
+	get_online_cpus();
+
+	for_each_cpu(cpu, cpumask_of_node(nid)) {
+		xpc_activate_mq_uv =
+			xpc_create_gru_mq_uv(XPC_ACTIVATE_MQ_SIZE_UV, nid,
+					     XPC_ACTIVATE_IRQ_NAME,
+					     xpc_handle_activate_IRQ_uv);
+		if (!IS_ERR(xpc_activate_mq_uv))
+			break;
+	}
+	if (IS_ERR(xpc_activate_mq_uv)) {
+		put_online_cpus();
+		return PTR_ERR(xpc_activate_mq_uv);
+	}
+
+	for_each_cpu(cpu, cpumask_of_node(nid)) {
+		xpc_notify_mq_uv =
+			xpc_create_gru_mq_uv(XPC_NOTIFY_MQ_SIZE_UV, nid,
+					     XPC_NOTIFY_IRQ_NAME,
+					     xpc_handle_notify_IRQ_uv);
+		if (!IS_ERR(xpc_notify_mq_uv))
+			break;
+	}
+	if (IS_ERR(xpc_notify_mq_uv)) {
+		xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
+		put_online_cpus();
+		return PTR_ERR(xpc_notify_mq_uv);
+	}
+
+	put_online_cpus();
+	return 0;
+}
+
+int
+xpc_init_uv(void)
+{
+	int nid;
+	int ret = 0;
+
+	xpc_arch_ops = xpc_arch_ops_uv;
+
+	if (sizeof(struct xpc_notify_mq_msghdr_uv) > XPC_MSG_HDR_MAX_SIZE) {
+		dev_err(xpc_part, "xpc_notify_mq_msghdr_uv is larger than %d\n",
+			XPC_MSG_HDR_MAX_SIZE);
+		return -E2BIG;
+	}
+
+	if (xpc_mq_node < 0)
+		for_each_online_node(nid) {
+			ret = xpc_init_mq_node(nid);
+
+			if (!ret)
+				break;
+		}
+	else
+		ret = xpc_init_mq_node(xpc_mq_node);
+
+	if (ret < 0)
+		dev_err(xpc_part, "xpc_init_mq_node() returned error=%d\n",
+			-ret);
+
+	return ret;
+}
+
+void
+xpc_exit_uv(void)
+{
+	xpc_destroy_gru_mq_uv(xpc_notify_mq_uv);
+	xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
+}
+
+module_param(xpc_mq_node, int, 0);
+MODULE_PARM_DESC(xpc_mq_node, "Node number on which to allocate message queues.");