1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (c) 2008-2009 Silicon Graphics, Inc.  All Rights Reserved.
   7 */
   8
   9/*
  10 * Cross Partition Communication (XPC) uv-based functions.
  11 *
  12 *     Architecture specific implementation of common functions.
  13 *
  14 */
  15
  16#include <linux/kernel.h>
  17#include <linux/mm.h>
  18#include <linux/interrupt.h>
  19#include <linux/delay.h>
  20#include <linux/device.h>
  21#include <linux/cpu.h>
  22#include <linux/module.h>
  23#include <linux/err.h>
  24#include <linux/slab.h>
 
  25#include <asm/uv/uv_hub.h>
  26#if defined CONFIG_X86_64
  27#include <asm/uv/bios.h>
  28#include <asm/uv/uv_irq.h>
  29#elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
  30#include <asm/sn/intr.h>
  31#include <asm/sn/sn_sal.h>
  32#endif
  33#include "../sgi-gru/gru.h"
  34#include "../sgi-gru/grukservices.h"
  35#include "xpc.h"
  36
  37#if defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
  38struct uv_IO_APIC_route_entry {
  39	__u64	vector		:  8,
  40		delivery_mode	:  3,
  41		dest_mode	:  1,
  42		delivery_status	:  1,
  43		polarity	:  1,
  44		__reserved_1	:  1,
  45		trigger		:  1,
  46		mask		:  1,
  47		__reserved_2	: 15,
  48		dest		: 32;
  49};
  50#endif
  51
  52static struct xpc_heartbeat_uv *xpc_heartbeat_uv;
  53
  54#define XPC_ACTIVATE_MSG_SIZE_UV	(1 * GRU_CACHE_LINE_BYTES)
  55#define XPC_ACTIVATE_MQ_SIZE_UV		(4 * XP_MAX_NPARTITIONS_UV * \
  56					 XPC_ACTIVATE_MSG_SIZE_UV)
  57#define XPC_ACTIVATE_IRQ_NAME		"xpc_activate"
  58
  59#define XPC_NOTIFY_MSG_SIZE_UV		(2 * GRU_CACHE_LINE_BYTES)
  60#define XPC_NOTIFY_MQ_SIZE_UV		(4 * XP_MAX_NPARTITIONS_UV * \
  61					 XPC_NOTIFY_MSG_SIZE_UV)
  62#define XPC_NOTIFY_IRQ_NAME		"xpc_notify"
  63
  64static int xpc_mq_node = -1;
  65
  66static struct xpc_gru_mq_uv *xpc_activate_mq_uv;
  67static struct xpc_gru_mq_uv *xpc_notify_mq_uv;
  68
  69static int
  70xpc_setup_partitions_uv(void)
  71{
  72	short partid;
  73	struct xpc_partition_uv *part_uv;
  74
  75	for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
  76		part_uv = &xpc_partitions[partid].sn.uv;
  77
  78		mutex_init(&part_uv->cached_activate_gru_mq_desc_mutex);
  79		spin_lock_init(&part_uv->flags_lock);
  80		part_uv->remote_act_state = XPC_P_AS_INACTIVE;
  81	}
  82	return 0;
  83}
  84
  85static void
  86xpc_teardown_partitions_uv(void)
  87{
  88	short partid;
  89	struct xpc_partition_uv *part_uv;
  90	unsigned long irq_flags;
  91
  92	for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
  93		part_uv = &xpc_partitions[partid].sn.uv;
  94
  95		if (part_uv->cached_activate_gru_mq_desc != NULL) {
  96			mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
  97			spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
  98			part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
  99			spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
 100			kfree(part_uv->cached_activate_gru_mq_desc);
 101			part_uv->cached_activate_gru_mq_desc = NULL;
 102			mutex_unlock(&part_uv->
 103				     cached_activate_gru_mq_desc_mutex);
 104		}
 105	}
 106}
 107
 108static int
 109xpc_get_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq, int cpu, char *irq_name)
 110{
 111	int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
 112
 113#if defined CONFIG_X86_64
 114	mq->irq = uv_setup_irq(irq_name, cpu, mq->mmr_blade, mq->mmr_offset,
 115			UV_AFFINITY_CPU);
 116	if (mq->irq < 0)
 117		return mq->irq;
 118
 119	mq->mmr_value = uv_read_global_mmr64(mmr_pnode, mq->mmr_offset);
 120
 121#elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
 122	if (strcmp(irq_name, XPC_ACTIVATE_IRQ_NAME) == 0)
 123		mq->irq = SGI_XPC_ACTIVATE;
 124	else if (strcmp(irq_name, XPC_NOTIFY_IRQ_NAME) == 0)
 125		mq->irq = SGI_XPC_NOTIFY;
 126	else
 127		return -EINVAL;
 128
 129	mq->mmr_value = (unsigned long)cpu_physical_id(cpu) << 32 | mq->irq;
 130	uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mq->mmr_value);
 131#else
 132	#error not a supported configuration
 133#endif
 134
 135	return 0;
 136}
 137
 138static void
 139xpc_release_gru_mq_irq_uv(struct xpc_gru_mq_uv *mq)
 140{
 141#if defined CONFIG_X86_64
 142	uv_teardown_irq(mq->irq);
 143
 144#elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
 145	int mmr_pnode;
 146	unsigned long mmr_value;
 147
 148	mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
 149	mmr_value = 1UL << 16;
 150
 151	uv_write_global_mmr64(mmr_pnode, mq->mmr_offset, mmr_value);
 152#else
 153	#error not a supported configuration
 154#endif
 155}
 156
 157static int
 158xpc_gru_mq_watchlist_alloc_uv(struct xpc_gru_mq_uv *mq)
 159{
 160	int ret;
 161
 162#if defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
 163	int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
 164
 165	ret = sn_mq_watchlist_alloc(mmr_pnode, (void *)uv_gpa(mq->address),
 166				    mq->order, &mq->mmr_offset);
 167	if (ret < 0) {
 168		dev_err(xpc_part, "sn_mq_watchlist_alloc() failed, ret=%d\n",
 169			ret);
 170		return -EBUSY;
 171	}
 172#elif defined CONFIG_X86_64
 173	ret = uv_bios_mq_watchlist_alloc(uv_gpa(mq->address),
 174					 mq->order, &mq->mmr_offset);
 175	if (ret < 0) {
 176		dev_err(xpc_part, "uv_bios_mq_watchlist_alloc() failed, "
 177			"ret=%d\n", ret);
 178		return ret;
 179	}
 180#else
 181	#error not a supported configuration
 182#endif
 183
 184	mq->watchlist_num = ret;
 185	return 0;
 186}
 187
 188static void
 189xpc_gru_mq_watchlist_free_uv(struct xpc_gru_mq_uv *mq)
 190{
 191	int ret;
 192	int mmr_pnode = uv_blade_to_pnode(mq->mmr_blade);
 193
 194#if defined CONFIG_X86_64
 195	ret = uv_bios_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
 196	BUG_ON(ret != BIOS_STATUS_SUCCESS);
 197#elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
 198	ret = sn_mq_watchlist_free(mmr_pnode, mq->watchlist_num);
 199	BUG_ON(ret != SALRET_OK);
 200#else
 201	#error not a supported configuration
 202#endif
 203}
 204
 205static struct xpc_gru_mq_uv *
 206xpc_create_gru_mq_uv(unsigned int mq_size, int cpu, char *irq_name,
 207		     irq_handler_t irq_handler)
 208{
 209	enum xp_retval xp_ret;
 210	int ret;
 211	int nid;
 212	int nasid;
 213	int pg_order;
 214	struct page *page;
 215	struct xpc_gru_mq_uv *mq;
 216	struct uv_IO_APIC_route_entry *mmr_value;
 217
 218	mq = kmalloc(sizeof(struct xpc_gru_mq_uv), GFP_KERNEL);
 219	if (mq == NULL) {
 220		dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
 221			"a xpc_gru_mq_uv structure\n");
 222		ret = -ENOMEM;
 223		goto out_0;
 224	}
 225
 226	mq->gru_mq_desc = kzalloc(sizeof(struct gru_message_queue_desc),
 227				  GFP_KERNEL);
 228	if (mq->gru_mq_desc == NULL) {
 229		dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to kmalloc() "
 230			"a gru_message_queue_desc structure\n");
 231		ret = -ENOMEM;
 232		goto out_1;
 233	}
 234
 235	pg_order = get_order(mq_size);
 236	mq->order = pg_order + PAGE_SHIFT;
 237	mq_size = 1UL << mq->order;
 238
 239	mq->mmr_blade = uv_cpu_to_blade_id(cpu);
 240
 241	nid = cpu_to_node(cpu);
 242	page = __alloc_pages_node(nid,
 243				      GFP_KERNEL | __GFP_ZERO | __GFP_THISNODE,
 244				      pg_order);
 245	if (page == NULL) {
 246		dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to alloc %d "
 247			"bytes of memory on nid=%d for GRU mq\n", mq_size, nid);
 248		ret = -ENOMEM;
 249		goto out_2;
 250	}
 251	mq->address = page_address(page);
 252
 253	/* enable generation of irq when GRU mq operation occurs to this mq */
 254	ret = xpc_gru_mq_watchlist_alloc_uv(mq);
 255	if (ret != 0)
 256		goto out_3;
 257
 258	ret = xpc_get_gru_mq_irq_uv(mq, cpu, irq_name);
 259	if (ret != 0)
 260		goto out_4;
 261
 262	ret = request_irq(mq->irq, irq_handler, 0, irq_name, NULL);
 263	if (ret != 0) {
 264		dev_err(xpc_part, "request_irq(irq=%d) returned error=%d\n",
 265			mq->irq, -ret);
 266		goto out_5;
 267	}
 268
 269	nasid = UV_PNODE_TO_NASID(uv_cpu_to_pnode(cpu));
 270
 271	mmr_value = (struct uv_IO_APIC_route_entry *)&mq->mmr_value;
 272	ret = gru_create_message_queue(mq->gru_mq_desc, mq->address, mq_size,
 273				     nasid, mmr_value->vector, mmr_value->dest);
 274	if (ret != 0) {
 275		dev_err(xpc_part, "gru_create_message_queue() returned "
 276			"error=%d\n", ret);
 277		ret = -EINVAL;
 278		goto out_6;
 279	}
 280
 281	/* allow other partitions to access this GRU mq */
 282	xp_ret = xp_expand_memprotect(xp_pa(mq->address), mq_size);
 283	if (xp_ret != xpSuccess) {
 284		ret = -EACCES;
 285		goto out_6;
 286	}
 287
 288	return mq;
 289
 290	/* something went wrong */
 291out_6:
 292	free_irq(mq->irq, NULL);
 293out_5:
 294	xpc_release_gru_mq_irq_uv(mq);
 295out_4:
 296	xpc_gru_mq_watchlist_free_uv(mq);
 297out_3:
 298	free_pages((unsigned long)mq->address, pg_order);
 299out_2:
 300	kfree(mq->gru_mq_desc);
 301out_1:
 302	kfree(mq);
 303out_0:
 304	return ERR_PTR(ret);
 305}
 306
 307static void
 308xpc_destroy_gru_mq_uv(struct xpc_gru_mq_uv *mq)
 309{
 310	unsigned int mq_size;
 311	int pg_order;
 312	int ret;
 313
 314	/* disallow other partitions to access GRU mq */
 315	mq_size = 1UL << mq->order;
 316	ret = xp_restrict_memprotect(xp_pa(mq->address), mq_size);
 317	BUG_ON(ret != xpSuccess);
 318
 319	/* unregister irq handler and release mq irq/vector mapping */
 320	free_irq(mq->irq, NULL);
 321	xpc_release_gru_mq_irq_uv(mq);
 322
 323	/* disable generation of irq when GRU mq op occurs to this mq */
 324	xpc_gru_mq_watchlist_free_uv(mq);
 325
 326	pg_order = mq->order - PAGE_SHIFT;
 327	free_pages((unsigned long)mq->address, pg_order);
 328
 329	kfree(mq);
 330}
 331
 332static enum xp_retval
 333xpc_send_gru_msg(struct gru_message_queue_desc *gru_mq_desc, void *msg,
 334		 size_t msg_size)
 335{
 336	enum xp_retval xp_ret;
 337	int ret;
 338
 339	while (1) {
 340		ret = gru_send_message_gpa(gru_mq_desc, msg, msg_size);
 341		if (ret == MQE_OK) {
 342			xp_ret = xpSuccess;
 343			break;
 344		}
 345
 346		if (ret == MQE_QUEUE_FULL) {
 347			dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
 348				"error=MQE_QUEUE_FULL\n");
 349			/* !!! handle QLimit reached; delay & try again */
 350			/* ??? Do we add a limit to the number of retries? */
 351			(void)msleep_interruptible(10);
 352		} else if (ret == MQE_CONGESTION) {
 353			dev_dbg(xpc_chan, "gru_send_message_gpa() returned "
 354				"error=MQE_CONGESTION\n");
 355			/* !!! handle LB Overflow; simply try again */
 356			/* ??? Do we add a limit to the number of retries? */
 357		} else {
 358			/* !!! Currently this is MQE_UNEXPECTED_CB_ERR */
 359			dev_err(xpc_chan, "gru_send_message_gpa() returned "
 360				"error=%d\n", ret);
 361			xp_ret = xpGruSendMqError;
 362			break;
 363		}
 364	}
 365	return xp_ret;
 366}
 367
 368static void
 369xpc_process_activate_IRQ_rcvd_uv(void)
 370{
 371	unsigned long irq_flags;
 372	short partid;
 373	struct xpc_partition *part;
 374	u8 act_state_req;
 375
 376	DBUG_ON(xpc_activate_IRQ_rcvd == 0);
 377
 378	spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 379	for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
 380		part = &xpc_partitions[partid];
 381
 382		if (part->sn.uv.act_state_req == 0)
 383			continue;
 384
 385		xpc_activate_IRQ_rcvd--;
 386		BUG_ON(xpc_activate_IRQ_rcvd < 0);
 387
 388		act_state_req = part->sn.uv.act_state_req;
 389		part->sn.uv.act_state_req = 0;
 390		spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 391
 392		if (act_state_req == XPC_P_ASR_ACTIVATE_UV) {
 393			if (part->act_state == XPC_P_AS_INACTIVE)
 394				xpc_activate_partition(part);
 395			else if (part->act_state == XPC_P_AS_DEACTIVATING)
 396				XPC_DEACTIVATE_PARTITION(part, xpReactivating);
 397
 398		} else if (act_state_req == XPC_P_ASR_REACTIVATE_UV) {
 399			if (part->act_state == XPC_P_AS_INACTIVE)
 400				xpc_activate_partition(part);
 401			else
 402				XPC_DEACTIVATE_PARTITION(part, xpReactivating);
 403
 404		} else if (act_state_req == XPC_P_ASR_DEACTIVATE_UV) {
 405			XPC_DEACTIVATE_PARTITION(part, part->sn.uv.reason);
 406
 407		} else {
 408			BUG();
 409		}
 410
 411		spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 412		if (xpc_activate_IRQ_rcvd == 0)
 413			break;
 414	}
 415	spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 416
 417}
 418
 419static void
 420xpc_handle_activate_mq_msg_uv(struct xpc_partition *part,
 421			      struct xpc_activate_mq_msghdr_uv *msg_hdr,
 422			      int part_setup,
 423			      int *wakeup_hb_checker)
 424{
 425	unsigned long irq_flags;
 426	struct xpc_partition_uv *part_uv = &part->sn.uv;
 427	struct xpc_openclose_args *args;
 428
 429	part_uv->remote_act_state = msg_hdr->act_state;
 430
 431	switch (msg_hdr->type) {
 432	case XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV:
 433		/* syncing of remote_act_state was just done above */
 434		break;
 435
 436	case XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV: {
 437		struct xpc_activate_mq_msg_activate_req_uv *msg;
 438
 439		/*
 440		 * ??? Do we deal here with ts_jiffies being different
 441		 * ??? if act_state != XPC_P_AS_INACTIVE instead of
 442		 * ??? below?
 443		 */
 444		msg = container_of(msg_hdr, struct
 445				   xpc_activate_mq_msg_activate_req_uv, hdr);
 446
 447		spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 448		if (part_uv->act_state_req == 0)
 449			xpc_activate_IRQ_rcvd++;
 450		part_uv->act_state_req = XPC_P_ASR_ACTIVATE_UV;
 451		part->remote_rp_pa = msg->rp_gpa; /* !!! _pa is _gpa */
 452		part->remote_rp_ts_jiffies = msg_hdr->rp_ts_jiffies;
 453		part_uv->heartbeat_gpa = msg->heartbeat_gpa;
 454
 455		if (msg->activate_gru_mq_desc_gpa !=
 456		    part_uv->activate_gru_mq_desc_gpa) {
 457			spin_lock(&part_uv->flags_lock);
 458			part_uv->flags &= ~XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
 459			spin_unlock(&part_uv->flags_lock);
 460			part_uv->activate_gru_mq_desc_gpa =
 461			    msg->activate_gru_mq_desc_gpa;
 462		}
 463		spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 464
 465		(*wakeup_hb_checker)++;
 466		break;
 467	}
 468	case XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV: {
 469		struct xpc_activate_mq_msg_deactivate_req_uv *msg;
 470
 471		msg = container_of(msg_hdr, struct
 472				   xpc_activate_mq_msg_deactivate_req_uv, hdr);
 473
 474		spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 475		if (part_uv->act_state_req == 0)
 476			xpc_activate_IRQ_rcvd++;
 477		part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
 478		part_uv->reason = msg->reason;
 479		spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 480
 481		(*wakeup_hb_checker)++;
 482		return;
 483	}
 484	case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV: {
 485		struct xpc_activate_mq_msg_chctl_closerequest_uv *msg;
 486
 487		if (!part_setup)
 488			break;
 489
 490		msg = container_of(msg_hdr, struct
 491				   xpc_activate_mq_msg_chctl_closerequest_uv,
 492				   hdr);
 493		args = &part->remote_openclose_args[msg->ch_number];
 494		args->reason = msg->reason;
 495
 496		spin_lock_irqsave(&part->chctl_lock, irq_flags);
 497		part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREQUEST;
 498		spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
 499
 500		xpc_wakeup_channel_mgr(part);
 501		break;
 502	}
 503	case XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV: {
 504		struct xpc_activate_mq_msg_chctl_closereply_uv *msg;
 505
 506		if (!part_setup)
 507			break;
 508
 509		msg = container_of(msg_hdr, struct
 510				   xpc_activate_mq_msg_chctl_closereply_uv,
 511				   hdr);
 512
 513		spin_lock_irqsave(&part->chctl_lock, irq_flags);
 514		part->chctl.flags[msg->ch_number] |= XPC_CHCTL_CLOSEREPLY;
 515		spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
 516
 517		xpc_wakeup_channel_mgr(part);
 518		break;
 519	}
 520	case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV: {
 521		struct xpc_activate_mq_msg_chctl_openrequest_uv *msg;
 522
 523		if (!part_setup)
 524			break;
 525
 526		msg = container_of(msg_hdr, struct
 527				   xpc_activate_mq_msg_chctl_openrequest_uv,
 528				   hdr);
 529		args = &part->remote_openclose_args[msg->ch_number];
 530		args->entry_size = msg->entry_size;
 531		args->local_nentries = msg->local_nentries;
 532
 533		spin_lock_irqsave(&part->chctl_lock, irq_flags);
 534		part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREQUEST;
 535		spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
 536
 537		xpc_wakeup_channel_mgr(part);
 538		break;
 539	}
 540	case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV: {
 541		struct xpc_activate_mq_msg_chctl_openreply_uv *msg;
 542
 543		if (!part_setup)
 544			break;
 545
 546		msg = container_of(msg_hdr, struct
 547				   xpc_activate_mq_msg_chctl_openreply_uv, hdr);
 548		args = &part->remote_openclose_args[msg->ch_number];
 549		args->remote_nentries = msg->remote_nentries;
 550		args->local_nentries = msg->local_nentries;
 551		args->local_msgqueue_pa = msg->notify_gru_mq_desc_gpa;
 552
 553		spin_lock_irqsave(&part->chctl_lock, irq_flags);
 554		part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENREPLY;
 555		spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
 556
 557		xpc_wakeup_channel_mgr(part);
 558		break;
 559	}
 560	case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV: {
 561		struct xpc_activate_mq_msg_chctl_opencomplete_uv *msg;
 562
 563		if (!part_setup)
 564			break;
 565
 566		msg = container_of(msg_hdr, struct
 567				xpc_activate_mq_msg_chctl_opencomplete_uv, hdr);
 568		spin_lock_irqsave(&part->chctl_lock, irq_flags);
 569		part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENCOMPLETE;
 570		spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
 571
 572		xpc_wakeup_channel_mgr(part);
 573	}
 
 574	case XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV:
 575		spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
 576		part_uv->flags |= XPC_P_ENGAGED_UV;
 577		spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
 578		break;
 579
 580	case XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV:
 581		spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
 582		part_uv->flags &= ~XPC_P_ENGAGED_UV;
 583		spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
 584		break;
 585
 586	default:
 587		dev_err(xpc_part, "received unknown activate_mq msg type=%d "
 588			"from partition=%d\n", msg_hdr->type, XPC_PARTID(part));
 589
 590		/* get hb checker to deactivate from the remote partition */
 591		spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 592		if (part_uv->act_state_req == 0)
 593			xpc_activate_IRQ_rcvd++;
 594		part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
 595		part_uv->reason = xpBadMsgType;
 596		spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 597
 598		(*wakeup_hb_checker)++;
 599		return;
 600	}
 601
 602	if (msg_hdr->rp_ts_jiffies != part->remote_rp_ts_jiffies &&
 603	    part->remote_rp_ts_jiffies != 0) {
 604		/*
 605		 * ??? Does what we do here need to be sensitive to
 606		 * ??? act_state or remote_act_state?
 607		 */
 608		spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 609		if (part_uv->act_state_req == 0)
 610			xpc_activate_IRQ_rcvd++;
 611		part_uv->act_state_req = XPC_P_ASR_REACTIVATE_UV;
 612		spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 613
 614		(*wakeup_hb_checker)++;
 615	}
 616}
 617
 618static irqreturn_t
 619xpc_handle_activate_IRQ_uv(int irq, void *dev_id)
 620{
 621	struct xpc_activate_mq_msghdr_uv *msg_hdr;
 622	short partid;
 623	struct xpc_partition *part;
 624	int wakeup_hb_checker = 0;
 625	int part_referenced;
 626
 627	while (1) {
 628		msg_hdr = gru_get_next_message(xpc_activate_mq_uv->gru_mq_desc);
 629		if (msg_hdr == NULL)
 630			break;
 631
 632		partid = msg_hdr->partid;
 633		if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
 634			dev_err(xpc_part, "xpc_handle_activate_IRQ_uv() "
 635				"received invalid partid=0x%x in message\n",
 636				partid);
 637		} else {
 638			part = &xpc_partitions[partid];
 639
 640			part_referenced = xpc_part_ref(part);
 641			xpc_handle_activate_mq_msg_uv(part, msg_hdr,
 642						      part_referenced,
 643						      &wakeup_hb_checker);
 644			if (part_referenced)
 645				xpc_part_deref(part);
 646		}
 647
 648		gru_free_message(xpc_activate_mq_uv->gru_mq_desc, msg_hdr);
 649	}
 650
 651	if (wakeup_hb_checker)
 652		wake_up_interruptible(&xpc_activate_IRQ_wq);
 653
 654	return IRQ_HANDLED;
 655}
 656
 657static enum xp_retval
 658xpc_cache_remote_gru_mq_desc_uv(struct gru_message_queue_desc *gru_mq_desc,
 659				unsigned long gru_mq_desc_gpa)
 660{
 661	enum xp_retval ret;
 662
 663	ret = xp_remote_memcpy(uv_gpa(gru_mq_desc), gru_mq_desc_gpa,
 664			       sizeof(struct gru_message_queue_desc));
 665	if (ret == xpSuccess)
 666		gru_mq_desc->mq = NULL;
 667
 668	return ret;
 669}
 670
 671static enum xp_retval
 672xpc_send_activate_IRQ_uv(struct xpc_partition *part, void *msg, size_t msg_size,
 673			 int msg_type)
 674{
 675	struct xpc_activate_mq_msghdr_uv *msg_hdr = msg;
 676	struct xpc_partition_uv *part_uv = &part->sn.uv;
 677	struct gru_message_queue_desc *gru_mq_desc;
 678	unsigned long irq_flags;
 679	enum xp_retval ret;
 680
 681	DBUG_ON(msg_size > XPC_ACTIVATE_MSG_SIZE_UV);
 682
 683	msg_hdr->type = msg_type;
 684	msg_hdr->partid = xp_partition_id;
 685	msg_hdr->act_state = part->act_state;
 686	msg_hdr->rp_ts_jiffies = xpc_rsvd_page->ts_jiffies;
 687
 688	mutex_lock(&part_uv->cached_activate_gru_mq_desc_mutex);
 689again:
 690	if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV)) {
 691		gru_mq_desc = part_uv->cached_activate_gru_mq_desc;
 692		if (gru_mq_desc == NULL) {
 693			gru_mq_desc = kmalloc(sizeof(struct
 694					      gru_message_queue_desc),
 695					      GFP_KERNEL);
 696			if (gru_mq_desc == NULL) {
 697				ret = xpNoMemory;
 698				goto done;
 699			}
 700			part_uv->cached_activate_gru_mq_desc = gru_mq_desc;
 701		}
 702
 703		ret = xpc_cache_remote_gru_mq_desc_uv(gru_mq_desc,
 704						      part_uv->
 705						      activate_gru_mq_desc_gpa);
 706		if (ret != xpSuccess)
 707			goto done;
 708
 709		spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
 710		part_uv->flags |= XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV;
 711		spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
 712	}
 713
 714	/* ??? Is holding a spin_lock (ch->lock) during this call a bad idea? */
 715	ret = xpc_send_gru_msg(part_uv->cached_activate_gru_mq_desc, msg,
 716			       msg_size);
 717	if (ret != xpSuccess) {
 718		smp_rmb();	/* ensure a fresh copy of part_uv->flags */
 719		if (!(part_uv->flags & XPC_P_CACHED_ACTIVATE_GRU_MQ_DESC_UV))
 720			goto again;
 721	}
 722done:
 723	mutex_unlock(&part_uv->cached_activate_gru_mq_desc_mutex);
 724	return ret;
 725}
 726
 727static void
 728xpc_send_activate_IRQ_part_uv(struct xpc_partition *part, void *msg,
 729			      size_t msg_size, int msg_type)
 730{
 731	enum xp_retval ret;
 732
 733	ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
 734	if (unlikely(ret != xpSuccess))
 735		XPC_DEACTIVATE_PARTITION(part, ret);
 736}
 737
 738static void
 739xpc_send_activate_IRQ_ch_uv(struct xpc_channel *ch, unsigned long *irq_flags,
 740			 void *msg, size_t msg_size, int msg_type)
 741{
 742	struct xpc_partition *part = &xpc_partitions[ch->partid];
 743	enum xp_retval ret;
 744
 745	ret = xpc_send_activate_IRQ_uv(part, msg, msg_size, msg_type);
 746	if (unlikely(ret != xpSuccess)) {
 747		if (irq_flags != NULL)
 748			spin_unlock_irqrestore(&ch->lock, *irq_flags);
 749
 750		XPC_DEACTIVATE_PARTITION(part, ret);
 751
 752		if (irq_flags != NULL)
 753			spin_lock_irqsave(&ch->lock, *irq_flags);
 754	}
 755}
 756
 757static void
 758xpc_send_local_activate_IRQ_uv(struct xpc_partition *part, int act_state_req)
 759{
 760	unsigned long irq_flags;
 761	struct xpc_partition_uv *part_uv = &part->sn.uv;
 762
 763	/*
 764	 * !!! Make our side think that the remote partition sent an activate
 765	 * !!! mq message our way by doing what the activate IRQ handler would
 766	 * !!! do had one really been sent.
 767	 */
 768
 769	spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 770	if (part_uv->act_state_req == 0)
 771		xpc_activate_IRQ_rcvd++;
 772	part_uv->act_state_req = act_state_req;
 773	spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
 774
 775	wake_up_interruptible(&xpc_activate_IRQ_wq);
 776}
 777
 778static enum xp_retval
 779xpc_get_partition_rsvd_page_pa_uv(void *buf, u64 *cookie, unsigned long *rp_pa,
 780				  size_t *len)
 781{
 782	s64 status;
 783	enum xp_retval ret;
 784
 785#if defined CONFIG_X86_64
 786	status = uv_bios_reserved_page_pa((u64)buf, cookie, (u64 *)rp_pa,
 787					  (u64 *)len);
 788	if (status == BIOS_STATUS_SUCCESS)
 789		ret = xpSuccess;
 790	else if (status == BIOS_STATUS_MORE_PASSES)
 791		ret = xpNeedMoreInfo;
 792	else
 793		ret = xpBiosError;
 794
 795#elif defined CONFIG_IA64_GENERIC || defined CONFIG_IA64_SGI_UV
 796	status = sn_partition_reserved_page_pa((u64)buf, cookie, rp_pa, len);
 797	if (status == SALRET_OK)
 798		ret = xpSuccess;
 799	else if (status == SALRET_MORE_PASSES)
 800		ret = xpNeedMoreInfo;
 801	else
 802		ret = xpSalError;
 803
 804#else
 805	#error not a supported configuration
 806#endif
 807
 808	return ret;
 809}
 810
 811static int
 812xpc_setup_rsvd_page_uv(struct xpc_rsvd_page *rp)
 813{
 814	xpc_heartbeat_uv =
 815	    &xpc_partitions[sn_partition_id].sn.uv.cached_heartbeat;
 816	rp->sn.uv.heartbeat_gpa = uv_gpa(xpc_heartbeat_uv);
 817	rp->sn.uv.activate_gru_mq_desc_gpa =
 818	    uv_gpa(xpc_activate_mq_uv->gru_mq_desc);
 819	return 0;
 820}
 821
 822static void
 823xpc_allow_hb_uv(short partid)
 824{
 825}
 826
 827static void
 828xpc_disallow_hb_uv(short partid)
 829{
 830}
 831
 832static void
 833xpc_disallow_all_hbs_uv(void)
 834{
 835}
 836
 837static void
 838xpc_increment_heartbeat_uv(void)
 839{
 840	xpc_heartbeat_uv->value++;
 841}
 842
 843static void
 844xpc_offline_heartbeat_uv(void)
 845{
 846	xpc_increment_heartbeat_uv();
 847	xpc_heartbeat_uv->offline = 1;
 848}
 849
 850static void
 851xpc_online_heartbeat_uv(void)
 852{
 853	xpc_increment_heartbeat_uv();
 854	xpc_heartbeat_uv->offline = 0;
 855}
 856
 857static void
 858xpc_heartbeat_init_uv(void)
 859{
 860	xpc_heartbeat_uv->value = 1;
 861	xpc_heartbeat_uv->offline = 0;
 862}
 863
 864static void
 865xpc_heartbeat_exit_uv(void)
 866{
 867	xpc_offline_heartbeat_uv();
 868}
 869
 870static enum xp_retval
 871xpc_get_remote_heartbeat_uv(struct xpc_partition *part)
 872{
 873	struct xpc_partition_uv *part_uv = &part->sn.uv;
 874	enum xp_retval ret;
 875
 876	ret = xp_remote_memcpy(uv_gpa(&part_uv->cached_heartbeat),
 877			       part_uv->heartbeat_gpa,
 878			       sizeof(struct xpc_heartbeat_uv));
 879	if (ret != xpSuccess)
 880		return ret;
 881
 882	if (part_uv->cached_heartbeat.value == part->last_heartbeat &&
 883	    !part_uv->cached_heartbeat.offline) {
 884
 885		ret = xpNoHeartbeat;
 886	} else {
 887		part->last_heartbeat = part_uv->cached_heartbeat.value;
 888	}
 889	return ret;
 890}
 891
 892static void
 893xpc_request_partition_activation_uv(struct xpc_rsvd_page *remote_rp,
 894				    unsigned long remote_rp_gpa, int nasid)
 895{
 896	short partid = remote_rp->SAL_partid;
 897	struct xpc_partition *part = &xpc_partitions[partid];
 898	struct xpc_activate_mq_msg_activate_req_uv msg;
 899
 900	part->remote_rp_pa = remote_rp_gpa; /* !!! _pa here is really _gpa */
 901	part->remote_rp_ts_jiffies = remote_rp->ts_jiffies;
 902	part->sn.uv.heartbeat_gpa = remote_rp->sn.uv.heartbeat_gpa;
 903	part->sn.uv.activate_gru_mq_desc_gpa =
 904	    remote_rp->sn.uv.activate_gru_mq_desc_gpa;
 905
 906	/*
 907	 * ??? Is it a good idea to make this conditional on what is
 908	 * ??? potentially stale state information?
 909	 */
 910	if (part->sn.uv.remote_act_state == XPC_P_AS_INACTIVE) {
 911		msg.rp_gpa = uv_gpa(xpc_rsvd_page);
 912		msg.heartbeat_gpa = xpc_rsvd_page->sn.uv.heartbeat_gpa;
 913		msg.activate_gru_mq_desc_gpa =
 914		    xpc_rsvd_page->sn.uv.activate_gru_mq_desc_gpa;
 915		xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
 916					   XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV);
 917	}
 918
 919	if (part->act_state == XPC_P_AS_INACTIVE)
 920		xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
 921}
 922
 923static void
 924xpc_request_partition_reactivation_uv(struct xpc_partition *part)
 925{
 926	xpc_send_local_activate_IRQ_uv(part, XPC_P_ASR_ACTIVATE_UV);
 927}
 928
 929static void
 930xpc_request_partition_deactivation_uv(struct xpc_partition *part)
 931{
 932	struct xpc_activate_mq_msg_deactivate_req_uv msg;
 933
 934	/*
 935	 * ??? Is it a good idea to make this conditional on what is
 936	 * ??? potentially stale state information?
 937	 */
 938	if (part->sn.uv.remote_act_state != XPC_P_AS_DEACTIVATING &&
 939	    part->sn.uv.remote_act_state != XPC_P_AS_INACTIVE) {
 940
 941		msg.reason = part->reason;
 942		xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
 943					 XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV);
 944	}
 945}
 946
 947static void
 948xpc_cancel_partition_deactivation_request_uv(struct xpc_partition *part)
 949{
 950	/* nothing needs to be done */
 951	return;
 952}
 953
 954static void
 955xpc_init_fifo_uv(struct xpc_fifo_head_uv *head)
 956{
 957	head->first = NULL;
 958	head->last = NULL;
 959	spin_lock_init(&head->lock);
 960	head->n_entries = 0;
 961}
 962
 963static void *
 964xpc_get_fifo_entry_uv(struct xpc_fifo_head_uv *head)
 965{
 966	unsigned long irq_flags;
 967	struct xpc_fifo_entry_uv *first;
 968
 969	spin_lock_irqsave(&head->lock, irq_flags);
 970	first = head->first;
 971	if (head->first != NULL) {
 972		head->first = first->next;
 973		if (head->first == NULL)
 974			head->last = NULL;
 975
 976		head->n_entries--;
 977		BUG_ON(head->n_entries < 0);
 978
 979		first->next = NULL;
 980	}
 981	spin_unlock_irqrestore(&head->lock, irq_flags);
 982	return first;
 983}
 984
 985static void
 986xpc_put_fifo_entry_uv(struct xpc_fifo_head_uv *head,
 987		      struct xpc_fifo_entry_uv *last)
 988{
 989	unsigned long irq_flags;
 990
 991	last->next = NULL;
 992	spin_lock_irqsave(&head->lock, irq_flags);
 993	if (head->last != NULL)
 994		head->last->next = last;
 995	else
 996		head->first = last;
 997	head->last = last;
 998	head->n_entries++;
 999	spin_unlock_irqrestore(&head->lock, irq_flags);
1000}
1001
1002static int
1003xpc_n_of_fifo_entries_uv(struct xpc_fifo_head_uv *head)
1004{
1005	return head->n_entries;
1006}
1007
1008/*
1009 * Setup the channel structures that are uv specific.
1010 */
1011static enum xp_retval
1012xpc_setup_ch_structures_uv(struct xpc_partition *part)
1013{
1014	struct xpc_channel_uv *ch_uv;
1015	int ch_number;
1016
1017	for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
1018		ch_uv = &part->channels[ch_number].sn.uv;
1019
1020		xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1021		xpc_init_fifo_uv(&ch_uv->recv_msg_list);
1022	}
1023
1024	return xpSuccess;
1025}
1026
1027/*
1028 * Teardown the channel structures that are uv specific.
1029 */
1030static void
1031xpc_teardown_ch_structures_uv(struct xpc_partition *part)
1032{
1033	/* nothing needs to be done */
1034	return;
1035}
1036
1037static enum xp_retval
1038xpc_make_first_contact_uv(struct xpc_partition *part)
1039{
1040	struct xpc_activate_mq_msg_uv msg;
1041
1042	/*
1043	 * We send a sync msg to get the remote partition's remote_act_state
1044	 * updated to our current act_state which at this point should
1045	 * be XPC_P_AS_ACTIVATING.
1046	 */
1047	xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1048				      XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV);
1049
1050	while (!((part->sn.uv.remote_act_state == XPC_P_AS_ACTIVATING) ||
1051		 (part->sn.uv.remote_act_state == XPC_P_AS_ACTIVE))) {
1052
1053		dev_dbg(xpc_part, "waiting to make first contact with "
1054			"partition %d\n", XPC_PARTID(part));
1055
1056		/* wait a 1/4 of a second or so */
1057		(void)msleep_interruptible(250);
1058
1059		if (part->act_state == XPC_P_AS_DEACTIVATING)
1060			return part->reason;
1061	}
1062
1063	return xpSuccess;
1064}
1065
1066static u64
1067xpc_get_chctl_all_flags_uv(struct xpc_partition *part)
1068{
1069	unsigned long irq_flags;
1070	union xpc_channel_ctl_flags chctl;
1071
1072	spin_lock_irqsave(&part->chctl_lock, irq_flags);
1073	chctl = part->chctl;
1074	if (chctl.all_flags != 0)
1075		part->chctl.all_flags = 0;
1076
1077	spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1078	return chctl.all_flags;
1079}
1080
1081static enum xp_retval
1082xpc_allocate_send_msg_slot_uv(struct xpc_channel *ch)
1083{
1084	struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1085	struct xpc_send_msg_slot_uv *msg_slot;
1086	unsigned long irq_flags;
1087	int nentries;
1088	int entry;
1089	size_t nbytes;
1090
1091	for (nentries = ch->local_nentries; nentries > 0; nentries--) {
1092		nbytes = nentries * sizeof(struct xpc_send_msg_slot_uv);
1093		ch_uv->send_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1094		if (ch_uv->send_msg_slots == NULL)
1095			continue;
1096
1097		for (entry = 0; entry < nentries; entry++) {
1098			msg_slot = &ch_uv->send_msg_slots[entry];
1099
1100			msg_slot->msg_slot_number = entry;
1101			xpc_put_fifo_entry_uv(&ch_uv->msg_slot_free_list,
1102					      &msg_slot->next);
1103		}
1104
1105		spin_lock_irqsave(&ch->lock, irq_flags);
1106		if (nentries < ch->local_nentries)
1107			ch->local_nentries = nentries;
1108		spin_unlock_irqrestore(&ch->lock, irq_flags);
1109		return xpSuccess;
1110	}
1111
1112	return xpNoMemory;
1113}
1114
1115static enum xp_retval
1116xpc_allocate_recv_msg_slot_uv(struct xpc_channel *ch)
1117{
1118	struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1119	struct xpc_notify_mq_msg_uv *msg_slot;
1120	unsigned long irq_flags;
1121	int nentries;
1122	int entry;
1123	size_t nbytes;
1124
1125	for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
1126		nbytes = nentries * ch->entry_size;
1127		ch_uv->recv_msg_slots = kzalloc(nbytes, GFP_KERNEL);
1128		if (ch_uv->recv_msg_slots == NULL)
1129			continue;
1130
1131		for (entry = 0; entry < nentries; entry++) {
1132			msg_slot = ch_uv->recv_msg_slots +
1133			    entry * ch->entry_size;
1134
1135			msg_slot->hdr.msg_slot_number = entry;
1136		}
1137
1138		spin_lock_irqsave(&ch->lock, irq_flags);
1139		if (nentries < ch->remote_nentries)
1140			ch->remote_nentries = nentries;
1141		spin_unlock_irqrestore(&ch->lock, irq_flags);
1142		return xpSuccess;
1143	}
1144
1145	return xpNoMemory;
1146}
1147
1148/*
1149 * Allocate msg_slots associated with the channel.
1150 */
1151static enum xp_retval
1152xpc_setup_msg_structures_uv(struct xpc_channel *ch)
1153{
1154	static enum xp_retval ret;
1155	struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1156
1157	DBUG_ON(ch->flags & XPC_C_SETUP);
1158
1159	ch_uv->cached_notify_gru_mq_desc = kmalloc(sizeof(struct
1160						   gru_message_queue_desc),
1161						   GFP_KERNEL);
1162	if (ch_uv->cached_notify_gru_mq_desc == NULL)
1163		return xpNoMemory;
1164
1165	ret = xpc_allocate_send_msg_slot_uv(ch);
1166	if (ret == xpSuccess) {
1167
1168		ret = xpc_allocate_recv_msg_slot_uv(ch);
1169		if (ret != xpSuccess) {
1170			kfree(ch_uv->send_msg_slots);
1171			xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1172		}
1173	}
1174	return ret;
1175}
1176
1177/*
1178 * Free up msg_slots and clear other stuff that were setup for the specified
1179 * channel.
1180 */
1181static void
1182xpc_teardown_msg_structures_uv(struct xpc_channel *ch)
1183{
1184	struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1185
1186	DBUG_ON(!spin_is_locked(&ch->lock));
1187
1188	kfree(ch_uv->cached_notify_gru_mq_desc);
1189	ch_uv->cached_notify_gru_mq_desc = NULL;
1190
1191	if (ch->flags & XPC_C_SETUP) {
1192		xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
1193		kfree(ch_uv->send_msg_slots);
1194		xpc_init_fifo_uv(&ch_uv->recv_msg_list);
1195		kfree(ch_uv->recv_msg_slots);
1196	}
1197}
1198
1199static void
1200xpc_send_chctl_closerequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1201{
1202	struct xpc_activate_mq_msg_chctl_closerequest_uv msg;
1203
1204	msg.ch_number = ch->number;
1205	msg.reason = ch->reason;
1206	xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1207				    XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV);
1208}
1209
1210static void
1211xpc_send_chctl_closereply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1212{
1213	struct xpc_activate_mq_msg_chctl_closereply_uv msg;
1214
1215	msg.ch_number = ch->number;
1216	xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1217				    XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV);
1218}
1219
1220static void
1221xpc_send_chctl_openrequest_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1222{
1223	struct xpc_activate_mq_msg_chctl_openrequest_uv msg;
1224
1225	msg.ch_number = ch->number;
1226	msg.entry_size = ch->entry_size;
1227	msg.local_nentries = ch->local_nentries;
1228	xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1229				    XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV);
1230}
1231
1232static void
1233xpc_send_chctl_openreply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1234{
1235	struct xpc_activate_mq_msg_chctl_openreply_uv msg;
1236
1237	msg.ch_number = ch->number;
1238	msg.local_nentries = ch->local_nentries;
1239	msg.remote_nentries = ch->remote_nentries;
1240	msg.notify_gru_mq_desc_gpa = uv_gpa(xpc_notify_mq_uv->gru_mq_desc);
1241	xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1242				    XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV);
1243}
1244
1245static void
1246xpc_send_chctl_opencomplete_uv(struct xpc_channel *ch, unsigned long *irq_flags)
1247{
1248	struct xpc_activate_mq_msg_chctl_opencomplete_uv msg;
1249
1250	msg.ch_number = ch->number;
1251	xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
1252				    XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV);
1253}
1254
1255static void
1256xpc_send_chctl_local_msgrequest_uv(struct xpc_partition *part, int ch_number)
1257{
1258	unsigned long irq_flags;
1259
1260	spin_lock_irqsave(&part->chctl_lock, irq_flags);
1261	part->chctl.flags[ch_number] |= XPC_CHCTL_MSGREQUEST;
1262	spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
1263
1264	xpc_wakeup_channel_mgr(part);
1265}
1266
1267static enum xp_retval
1268xpc_save_remote_msgqueue_pa_uv(struct xpc_channel *ch,
1269			       unsigned long gru_mq_desc_gpa)
1270{
1271	struct xpc_channel_uv *ch_uv = &ch->sn.uv;
1272
1273	DBUG_ON(ch_uv->cached_notify_gru_mq_desc == NULL);
1274	return xpc_cache_remote_gru_mq_desc_uv(ch_uv->cached_notify_gru_mq_desc,
1275					       gru_mq_desc_gpa);
1276}
1277
1278static void
1279xpc_indicate_partition_engaged_uv(struct xpc_partition *part)
1280{
1281	struct xpc_activate_mq_msg_uv msg;
1282
1283	xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1284				      XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV);
1285}
1286
1287static void
1288xpc_indicate_partition_disengaged_uv(struct xpc_partition *part)
1289{
1290	struct xpc_activate_mq_msg_uv msg;
1291
1292	xpc_send_activate_IRQ_part_uv(part, &msg, sizeof(msg),
1293				      XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV);
1294}
1295
1296static void
1297xpc_assume_partition_disengaged_uv(short partid)
1298{
1299	struct xpc_partition_uv *part_uv = &xpc_partitions[partid].sn.uv;
1300	unsigned long irq_flags;
1301
1302	spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
1303	part_uv->flags &= ~XPC_P_ENGAGED_UV;
1304	spin_unlock_irqrestore(&part_uv->flags_lock, irq_flags);
1305}
1306
1307static int
1308xpc_partition_engaged_uv(short partid)
1309{
1310	return (xpc_partitions[partid].sn.uv.flags & XPC_P_ENGAGED_UV) != 0;
1311}
1312
1313static int
1314xpc_any_partition_engaged_uv(void)
1315{
1316	struct xpc_partition_uv *part_uv;
1317	short partid;
1318
1319	for (partid = 0; partid < XP_MAX_NPARTITIONS_UV; partid++) {
1320		part_uv = &xpc_partitions[partid].sn.uv;
1321		if ((part_uv->flags & XPC_P_ENGAGED_UV) != 0)
1322			return 1;
1323	}
1324	return 0;
1325}
1326
1327static enum xp_retval
1328xpc_allocate_msg_slot_uv(struct xpc_channel *ch, u32 flags,
1329			 struct xpc_send_msg_slot_uv **address_of_msg_slot)
1330{
1331	enum xp_retval ret;
1332	struct xpc_send_msg_slot_uv *msg_slot;
1333	struct xpc_fifo_entry_uv *entry;
1334
1335	while (1) {
1336		entry = xpc_get_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list);
1337		if (entry != NULL)
1338			break;
1339
1340		if (flags & XPC_NOWAIT)
1341			return xpNoWait;
1342
1343		ret = xpc_allocate_msg_wait(ch);
1344		if (ret != xpInterrupted && ret != xpTimeout)
1345			return ret;
1346	}
1347
1348	msg_slot = container_of(entry, struct xpc_send_msg_slot_uv, next);
1349	*address_of_msg_slot = msg_slot;
1350	return xpSuccess;
1351}
1352
1353static void
1354xpc_free_msg_slot_uv(struct xpc_channel *ch,
1355		     struct xpc_send_msg_slot_uv *msg_slot)
1356{
1357	xpc_put_fifo_entry_uv(&ch->sn.uv.msg_slot_free_list, &msg_slot->next);
1358
1359	/* wakeup anyone waiting for a free msg slot */
1360	if (atomic_read(&ch->n_on_msg_allocate_wq) > 0)
1361		wake_up(&ch->msg_allocate_wq);
1362}
1363
1364static void
1365xpc_notify_sender_uv(struct xpc_channel *ch,
1366		     struct xpc_send_msg_slot_uv *msg_slot,
1367		     enum xp_retval reason)
1368{
1369	xpc_notify_func func = msg_slot->func;
1370
1371	if (func != NULL && cmpxchg(&msg_slot->func, func, NULL) == func) {
1372
1373		atomic_dec(&ch->n_to_notify);
1374
1375		dev_dbg(xpc_chan, "msg_slot->func() called, msg_slot=0x%p "
1376			"msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1377			msg_slot->msg_slot_number, ch->partid, ch->number);
1378
1379		func(reason, ch->partid, ch->number, msg_slot->key);
1380
1381		dev_dbg(xpc_chan, "msg_slot->func() returned, msg_slot=0x%p "
1382			"msg_slot_number=%d partid=%d channel=%d\n", msg_slot,
1383			msg_slot->msg_slot_number, ch->partid, ch->number);
1384	}
1385}
1386
1387static void
1388xpc_handle_notify_mq_ack_uv(struct xpc_channel *ch,
1389			    struct xpc_notify_mq_msg_uv *msg)
1390{
1391	struct xpc_send_msg_slot_uv *msg_slot;
1392	int entry = msg->hdr.msg_slot_number % ch->local_nentries;
1393
1394	msg_slot = &ch->sn.uv.send_msg_slots[entry];
1395
1396	BUG_ON(msg_slot->msg_slot_number != msg->hdr.msg_slot_number);
1397	msg_slot->msg_slot_number += ch->local_nentries;
1398
1399	if (msg_slot->func != NULL)
1400		xpc_notify_sender_uv(ch, msg_slot, xpMsgDelivered);
1401
1402	xpc_free_msg_slot_uv(ch, msg_slot);
1403}
1404
1405static void
1406xpc_handle_notify_mq_msg_uv(struct xpc_partition *part,
1407			    struct xpc_notify_mq_msg_uv *msg)
1408{
1409	struct xpc_partition_uv *part_uv = &part->sn.uv;
1410	struct xpc_channel *ch;
1411	struct xpc_channel_uv *ch_uv;
1412	struct xpc_notify_mq_msg_uv *msg_slot;
1413	unsigned long irq_flags;
1414	int ch_number = msg->hdr.ch_number;
1415
1416	if (unlikely(ch_number >= part->nchannels)) {
1417		dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received invalid "
1418			"channel number=0x%x in message from partid=%d\n",
1419			ch_number, XPC_PARTID(part));
1420
1421		/* get hb checker to deactivate from the remote partition */
1422		spin_lock_irqsave(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1423		if (part_uv->act_state_req == 0)
1424			xpc_activate_IRQ_rcvd++;
1425		part_uv->act_state_req = XPC_P_ASR_DEACTIVATE_UV;
1426		part_uv->reason = xpBadChannelNumber;
1427		spin_unlock_irqrestore(&xpc_activate_IRQ_rcvd_lock, irq_flags);
1428
1429		wake_up_interruptible(&xpc_activate_IRQ_wq);
1430		return;
1431	}
1432
1433	ch = &part->channels[ch_number];
1434	xpc_msgqueue_ref(ch);
1435
1436	if (!(ch->flags & XPC_C_CONNECTED)) {
1437		xpc_msgqueue_deref(ch);
1438		return;
1439	}
1440
1441	/* see if we're really dealing with an ACK for a previously sent msg */
1442	if (msg->hdr.size == 0) {
1443		xpc_handle_notify_mq_ack_uv(ch, msg);
1444		xpc_msgqueue_deref(ch);
1445		return;
1446	}
1447
1448	/* we're dealing with a normal message sent via the notify_mq */
1449	ch_uv = &ch->sn.uv;
1450
1451	msg_slot = ch_uv->recv_msg_slots +
1452	    (msg->hdr.msg_slot_number % ch->remote_nentries) * ch->entry_size;
1453
1454	BUG_ON(msg_slot->hdr.size != 0);
1455
1456	memcpy(msg_slot, msg, msg->hdr.size);
1457
1458	xpc_put_fifo_entry_uv(&ch_uv->recv_msg_list, &msg_slot->hdr.u.next);
1459
1460	if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) {
1461		/*
1462		 * If there is an existing idle kthread get it to deliver
1463		 * the payload, otherwise we'll have to get the channel mgr
1464		 * for this partition to create a kthread to do the delivery.
1465		 */
1466		if (atomic_read(&ch->kthreads_idle) > 0)
1467			wake_up_nr(&ch->idle_wq, 1);
1468		else
1469			xpc_send_chctl_local_msgrequest_uv(part, ch->number);
1470	}
1471	xpc_msgqueue_deref(ch);
1472}
1473
1474static irqreturn_t
1475xpc_handle_notify_IRQ_uv(int irq, void *dev_id)
1476{
1477	struct xpc_notify_mq_msg_uv *msg;
1478	short partid;
1479	struct xpc_partition *part;
1480
1481	while ((msg = gru_get_next_message(xpc_notify_mq_uv->gru_mq_desc)) !=
1482	       NULL) {
1483
1484		partid = msg->hdr.partid;
1485		if (partid < 0 || partid >= XP_MAX_NPARTITIONS_UV) {
1486			dev_err(xpc_part, "xpc_handle_notify_IRQ_uv() received "
1487				"invalid partid=0x%x in message\n", partid);
1488		} else {
1489			part = &xpc_partitions[partid];
1490
1491			if (xpc_part_ref(part)) {
1492				xpc_handle_notify_mq_msg_uv(part, msg);
1493				xpc_part_deref(part);
1494			}
1495		}
1496
1497		gru_free_message(xpc_notify_mq_uv->gru_mq_desc, msg);
1498	}
1499
1500	return IRQ_HANDLED;
1501}
1502
1503static int
1504xpc_n_of_deliverable_payloads_uv(struct xpc_channel *ch)
1505{
1506	return xpc_n_of_fifo_entries_uv(&ch->sn.uv.recv_msg_list);
1507}
1508
1509static void
1510xpc_process_msg_chctl_flags_uv(struct xpc_partition *part, int ch_number)
1511{
1512	struct xpc_channel *ch = &part->channels[ch_number];
1513	int ndeliverable_payloads;
1514
1515	xpc_msgqueue_ref(ch);
1516
1517	ndeliverable_payloads = xpc_n_of_deliverable_payloads_uv(ch);
1518
1519	if (ndeliverable_payloads > 0 &&
1520	    (ch->flags & XPC_C_CONNECTED) &&
1521	    (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE)) {
1522
1523		xpc_activate_kthreads(ch, ndeliverable_payloads);
1524	}
1525
1526	xpc_msgqueue_deref(ch);
1527}
1528
1529static enum xp_retval
1530xpc_send_payload_uv(struct xpc_channel *ch, u32 flags, void *payload,
1531		    u16 payload_size, u8 notify_type, xpc_notify_func func,
1532		    void *key)
1533{
1534	enum xp_retval ret = xpSuccess;
1535	struct xpc_send_msg_slot_uv *msg_slot = NULL;
1536	struct xpc_notify_mq_msg_uv *msg;
1537	u8 msg_buffer[XPC_NOTIFY_MSG_SIZE_UV];
1538	size_t msg_size;
1539
1540	DBUG_ON(notify_type != XPC_N_CALL);
1541
1542	msg_size = sizeof(struct xpc_notify_mq_msghdr_uv) + payload_size;
1543	if (msg_size > ch->entry_size)
1544		return xpPayloadTooBig;
1545
1546	xpc_msgqueue_ref(ch);
1547
1548	if (ch->flags & XPC_C_DISCONNECTING) {
1549		ret = ch->reason;
1550		goto out_1;
1551	}
1552	if (!(ch->flags & XPC_C_CONNECTED)) {
1553		ret = xpNotConnected;
1554		goto out_1;
1555	}
1556
1557	ret = xpc_allocate_msg_slot_uv(ch, flags, &msg_slot);
1558	if (ret != xpSuccess)
1559		goto out_1;
1560
1561	if (func != NULL) {
1562		atomic_inc(&ch->n_to_notify);
1563
1564		msg_slot->key = key;
1565		smp_wmb(); /* a non-NULL func must hit memory after the key */
1566		msg_slot->func = func;
1567
1568		if (ch->flags & XPC_C_DISCONNECTING) {
1569			ret = ch->reason;
1570			goto out_2;
1571		}
1572	}
1573
1574	msg = (struct xpc_notify_mq_msg_uv *)&msg_buffer;
1575	msg->hdr.partid = xp_partition_id;
1576	msg->hdr.ch_number = ch->number;
1577	msg->hdr.size = msg_size;
1578	msg->hdr.msg_slot_number = msg_slot->msg_slot_number;
1579	memcpy(&msg->payload, payload, payload_size);
1580
1581	ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1582			       msg_size);
1583	if (ret == xpSuccess)
1584		goto out_1;
1585
1586	XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1587out_2:
1588	if (func != NULL) {
1589		/*
1590		 * Try to NULL the msg_slot's func field. If we fail, then
1591		 * xpc_notify_senders_of_disconnect_uv() beat us to it, in which
1592		 * case we need to pretend we succeeded to send the message
1593		 * since the user will get a callout for the disconnect error
1594		 * by xpc_notify_senders_of_disconnect_uv(), and to also get an
1595		 * error returned here will confuse them. Additionally, since
1596		 * in this case the channel is being disconnected we don't need
1597		 * to put the the msg_slot back on the free list.
1598		 */
1599		if (cmpxchg(&msg_slot->func, func, NULL) != func) {
1600			ret = xpSuccess;
1601			goto out_1;
1602		}
1603
1604		msg_slot->key = NULL;
1605		atomic_dec(&ch->n_to_notify);
1606	}
1607	xpc_free_msg_slot_uv(ch, msg_slot);
1608out_1:
1609	xpc_msgqueue_deref(ch);
1610	return ret;
1611}
1612
1613/*
1614 * Tell the callers of xpc_send_notify() that the status of their payloads
1615 * is unknown because the channel is now disconnecting.
1616 *
1617 * We don't worry about putting these msg_slots on the free list since the
1618 * msg_slots themselves are about to be kfree'd.
1619 */
1620static void
1621xpc_notify_senders_of_disconnect_uv(struct xpc_channel *ch)
1622{
1623	struct xpc_send_msg_slot_uv *msg_slot;
1624	int entry;
1625
1626	DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING));
1627
1628	for (entry = 0; entry < ch->local_nentries; entry++) {
1629
1630		if (atomic_read(&ch->n_to_notify) == 0)
1631			break;
1632
1633		msg_slot = &ch->sn.uv.send_msg_slots[entry];
1634		if (msg_slot->func != NULL)
1635			xpc_notify_sender_uv(ch, msg_slot, ch->reason);
1636	}
1637}
1638
1639/*
1640 * Get the next deliverable message's payload.
1641 */
1642static void *
1643xpc_get_deliverable_payload_uv(struct xpc_channel *ch)
1644{
1645	struct xpc_fifo_entry_uv *entry;
1646	struct xpc_notify_mq_msg_uv *msg;
1647	void *payload = NULL;
1648
1649	if (!(ch->flags & XPC_C_DISCONNECTING)) {
1650		entry = xpc_get_fifo_entry_uv(&ch->sn.uv.recv_msg_list);
1651		if (entry != NULL) {
1652			msg = container_of(entry, struct xpc_notify_mq_msg_uv,
1653					   hdr.u.next);
1654			payload = &msg->payload;
1655		}
1656	}
1657	return payload;
1658}
1659
1660static void
1661xpc_received_payload_uv(struct xpc_channel *ch, void *payload)
1662{
1663	struct xpc_notify_mq_msg_uv *msg;
1664	enum xp_retval ret;
1665
1666	msg = container_of(payload, struct xpc_notify_mq_msg_uv, payload);
1667
1668	/* return an ACK to the sender of this message */
1669
1670	msg->hdr.partid = xp_partition_id;
1671	msg->hdr.size = 0;	/* size of zero indicates this is an ACK */
1672
1673	ret = xpc_send_gru_msg(ch->sn.uv.cached_notify_gru_mq_desc, msg,
1674			       sizeof(struct xpc_notify_mq_msghdr_uv));
1675	if (ret != xpSuccess)
1676		XPC_DEACTIVATE_PARTITION(&xpc_partitions[ch->partid], ret);
1677}
1678
1679static struct xpc_arch_operations xpc_arch_ops_uv = {
1680	.setup_partitions = xpc_setup_partitions_uv,
1681	.teardown_partitions = xpc_teardown_partitions_uv,
1682	.process_activate_IRQ_rcvd = xpc_process_activate_IRQ_rcvd_uv,
1683	.get_partition_rsvd_page_pa = xpc_get_partition_rsvd_page_pa_uv,
1684	.setup_rsvd_page = xpc_setup_rsvd_page_uv,
1685
1686	.allow_hb = xpc_allow_hb_uv,
1687	.disallow_hb = xpc_disallow_hb_uv,
1688	.disallow_all_hbs = xpc_disallow_all_hbs_uv,
1689	.increment_heartbeat = xpc_increment_heartbeat_uv,
1690	.offline_heartbeat = xpc_offline_heartbeat_uv,
1691	.online_heartbeat = xpc_online_heartbeat_uv,
1692	.heartbeat_init = xpc_heartbeat_init_uv,
1693	.heartbeat_exit = xpc_heartbeat_exit_uv,
1694	.get_remote_heartbeat = xpc_get_remote_heartbeat_uv,
1695
1696	.request_partition_activation =
1697		xpc_request_partition_activation_uv,
1698	.request_partition_reactivation =
1699		xpc_request_partition_reactivation_uv,
1700	.request_partition_deactivation =
1701		xpc_request_partition_deactivation_uv,
1702	.cancel_partition_deactivation_request =
1703		xpc_cancel_partition_deactivation_request_uv,
1704
1705	.setup_ch_structures = xpc_setup_ch_structures_uv,
1706	.teardown_ch_structures = xpc_teardown_ch_structures_uv,
1707
1708	.make_first_contact = xpc_make_first_contact_uv,
1709
1710	.get_chctl_all_flags = xpc_get_chctl_all_flags_uv,
1711	.send_chctl_closerequest = xpc_send_chctl_closerequest_uv,
1712	.send_chctl_closereply = xpc_send_chctl_closereply_uv,
1713	.send_chctl_openrequest = xpc_send_chctl_openrequest_uv,
1714	.send_chctl_openreply = xpc_send_chctl_openreply_uv,
1715	.send_chctl_opencomplete = xpc_send_chctl_opencomplete_uv,
1716	.process_msg_chctl_flags = xpc_process_msg_chctl_flags_uv,
1717
1718	.save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_uv,
1719
1720	.setup_msg_structures = xpc_setup_msg_structures_uv,
1721	.teardown_msg_structures = xpc_teardown_msg_structures_uv,
1722
1723	.indicate_partition_engaged = xpc_indicate_partition_engaged_uv,
1724	.indicate_partition_disengaged = xpc_indicate_partition_disengaged_uv,
1725	.assume_partition_disengaged = xpc_assume_partition_disengaged_uv,
1726	.partition_engaged = xpc_partition_engaged_uv,
1727	.any_partition_engaged = xpc_any_partition_engaged_uv,
1728
1729	.n_of_deliverable_payloads = xpc_n_of_deliverable_payloads_uv,
1730	.send_payload = xpc_send_payload_uv,
1731	.get_deliverable_payload = xpc_get_deliverable_payload_uv,
1732	.received_payload = xpc_received_payload_uv,
1733	.notify_senders_of_disconnect = xpc_notify_senders_of_disconnect_uv,
1734};
1735
1736static int
1737xpc_init_mq_node(int nid)
1738{
1739	int cpu;
1740
1741	get_online_cpus();
1742
1743	for_each_cpu(cpu, cpumask_of_node(nid)) {
1744		xpc_activate_mq_uv =
1745			xpc_create_gru_mq_uv(XPC_ACTIVATE_MQ_SIZE_UV, nid,
1746					     XPC_ACTIVATE_IRQ_NAME,
1747					     xpc_handle_activate_IRQ_uv);
1748		if (!IS_ERR(xpc_activate_mq_uv))
1749			break;
1750	}
1751	if (IS_ERR(xpc_activate_mq_uv)) {
1752		put_online_cpus();
1753		return PTR_ERR(xpc_activate_mq_uv);
1754	}
1755
1756	for_each_cpu(cpu, cpumask_of_node(nid)) {
1757		xpc_notify_mq_uv =
1758			xpc_create_gru_mq_uv(XPC_NOTIFY_MQ_SIZE_UV, nid,
1759					     XPC_NOTIFY_IRQ_NAME,
1760					     xpc_handle_notify_IRQ_uv);
1761		if (!IS_ERR(xpc_notify_mq_uv))
1762			break;
1763	}
1764	if (IS_ERR(xpc_notify_mq_uv)) {
1765		xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1766		put_online_cpus();
1767		return PTR_ERR(xpc_notify_mq_uv);
1768	}
1769
1770	put_online_cpus();
1771	return 0;
1772}
1773
1774int
1775xpc_init_uv(void)
1776{
1777	int nid;
1778	int ret = 0;
1779
1780	xpc_arch_ops = xpc_arch_ops_uv;
1781
1782	if (sizeof(struct xpc_notify_mq_msghdr_uv) > XPC_MSG_HDR_MAX_SIZE) {
1783		dev_err(xpc_part, "xpc_notify_mq_msghdr_uv is larger than %d\n",
1784			XPC_MSG_HDR_MAX_SIZE);
1785		return -E2BIG;
1786	}
1787
1788	if (xpc_mq_node < 0)
1789		for_each_online_node(nid) {
1790			ret = xpc_init_mq_node(nid);
1791
1792			if (!ret)
1793				break;
1794		}
1795	else
1796		ret = xpc_init_mq_node(xpc_mq_node);
1797
1798	if (ret < 0)
1799		dev_err(xpc_part, "xpc_init_mq_node() returned error=%d\n",
1800			-ret);
1801
1802	return ret;
1803}
1804
1805void
1806xpc_exit_uv(void)
1807{
1808	xpc_destroy_gru_mq_uv(xpc_notify_mq_uv);
1809	xpc_destroy_gru_mq_uv(xpc_activate_mq_uv);
1810}
1811
1812module_param(xpc_mq_node, int, 0);
1813MODULE_PARM_DESC(xpc_mq_node, "Node number on which to allocate message queues.");