[IA64] move XP and XPC to drivers/misc/sgi-xp

Move XPC and XPNET from arch/ia64/sn/kernel to drivers/misc/sgi-xp.

Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 0 insertions, 1239 deletions

diff --git a/arch/ia64/sn/kernel/xpc_partition.c b/arch/ia64/sn/kernel/xpc_partition.c
deleted file mode 100644
index 9e97c268483..00000000000
--- a/arch/ia64/sn/kernel/xpc_partition.c
+++ /dev/null
@@ -1,1239 +0,0 @@
-/*
- * 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) 2004-2006 Silicon Graphics, Inc.  All Rights Reserved.
- */
-
-
-/*
- * Cross Partition Communication (XPC) partition support.
- *
- *	This is the part of XPC that detects the presence/absence of
- *	other partitions. It provides a heartbeat and monitors the
- *	heartbeats of other partitions.
- *
- */
-
-
-#include <linux/kernel.h>
-#include <linux/sysctl.h>
-#include <linux/cache.h>
-#include <linux/mmzone.h>
-#include <linux/nodemask.h>
-#include <asm/uncached.h>
-#include <asm/sn/bte.h>
-#include <asm/sn/intr.h>
-#include <asm/sn/sn_sal.h>
-#include <asm/sn/nodepda.h>
-#include <asm/sn/addrs.h>
-#include <asm/sn/xpc.h>
-
-
-/* XPC is exiting flag */
-int xpc_exiting;
-
-
-/* SH_IPI_ACCESS shub register value on startup */
-static u64 xpc_sh1_IPI_access;
-static u64 xpc_sh2_IPI_access0;
-static u64 xpc_sh2_IPI_access1;
-static u64 xpc_sh2_IPI_access2;
-static u64 xpc_sh2_IPI_access3;
-
-
-/* original protection values for each node */
-u64 xpc_prot_vec[MAX_NUMNODES];
-
-
-/* this partition's reserved page pointers */
-struct xpc_rsvd_page *xpc_rsvd_page;
-static u64 *xpc_part_nasids;
-static u64 *xpc_mach_nasids;
-struct xpc_vars *xpc_vars;
-struct xpc_vars_part *xpc_vars_part;
-
-static int xp_nasid_mask_bytes;	/* actual size in bytes of nasid mask */
-static int xp_nasid_mask_words;	/* actual size in words of nasid mask */
-
-
-/*
- * For performance reasons, each entry of xpc_partitions[] is cacheline
- * aligned. And xpc_partitions[] is padded with an additional entry at the
- * end so that the last legitimate entry doesn't share its cacheline with
- * another variable.
- */
-struct xpc_partition xpc_partitions[XP_MAX_PARTITIONS + 1];
-
-
-/*
- * Generic buffer used to store a local copy of portions of a remote
- * partition's reserved page (either its header and part_nasids mask,
- * or its vars).
- */
-char *xpc_remote_copy_buffer;
-void *xpc_remote_copy_buffer_base;
-
-
-/*
- * Guarantee that the kmalloc'd memory is cacheline aligned.
- */
-void *
-xpc_kmalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
-{
-	/* see if kmalloc will give us cachline aligned memory by default */
-	*base = kmalloc(size, flags);
-	if (*base == NULL) {
-		return NULL;
-	}
-	if ((u64) *base == L1_CACHE_ALIGN((u64) *base)) {
-		return *base;
-	}
-	kfree(*base);
-
-	/* nope, we'll have to do it ourselves */
-	*base = kmalloc(size + L1_CACHE_BYTES, flags);
-	if (*base == NULL) {
-		return NULL;
-	}
-	return (void *) L1_CACHE_ALIGN((u64) *base);
-}
-
-
-/*
- * Given a nasid, get the physical address of the  partition's reserved page
- * for that nasid. This function returns 0 on any error.
- */
-static u64
-xpc_get_rsvd_page_pa(int nasid)
-{
-	bte_result_t bte_res;
-	s64 status;
-	u64 cookie = 0;
-	u64 rp_pa = nasid;	/* seed with nasid */
-	u64 len = 0;
-	u64 buf = buf;
-	u64 buf_len = 0;
-	void *buf_base = NULL;
-
-
-	while (1) {
-
-		status = sn_partition_reserved_page_pa(buf, &cookie, &rp_pa,
-								&len);
-
-		dev_dbg(xpc_part, "SAL returned with status=%li, cookie="
-			"0x%016lx, address=0x%016lx, len=0x%016lx\n",
-			status, cookie, rp_pa, len);
-
-		if (status != SALRET_MORE_PASSES) {
-			break;
-		}
-
-		if (L1_CACHE_ALIGN(len) > buf_len) {
-			kfree(buf_base);
-			buf_len = L1_CACHE_ALIGN(len);
-			buf = (u64) xpc_kmalloc_cacheline_aligned(buf_len,
-							GFP_KERNEL, &buf_base);
-			if (buf_base == NULL) {
-				dev_err(xpc_part, "unable to kmalloc "
-					"len=0x%016lx\n", buf_len);
-				status = SALRET_ERROR;
-				break;
-			}
-		}
-
-		bte_res = xp_bte_copy(rp_pa, buf, buf_len,
-					(BTE_NOTIFY | BTE_WACQUIRE), NULL);
-		if (bte_res != BTE_SUCCESS) {
-			dev_dbg(xpc_part, "xp_bte_copy failed %i\n", bte_res);
-			status = SALRET_ERROR;
-			break;
-		}
-	}
-
-	kfree(buf_base);
-
-	if (status != SALRET_OK) {
-		rp_pa = 0;
-	}
-	dev_dbg(xpc_part, "reserved page at phys address 0x%016lx\n", rp_pa);
-	return rp_pa;
-}
-
-
-/*
- * Fill the partition reserved page with the information needed by
- * other partitions to discover we are alive and establish initial
- * communications.
- */
-struct xpc_rsvd_page *
-xpc_rsvd_page_init(void)
-{
-	struct xpc_rsvd_page *rp;
-	AMO_t *amos_page;
-	u64 rp_pa, nasid_array = 0;
-	int i, ret;
-
-
-	/* get the local reserved page's address */
-
-	preempt_disable();
-	rp_pa = xpc_get_rsvd_page_pa(cpuid_to_nasid(smp_processor_id()));
-	preempt_enable();
-	if (rp_pa == 0) {
-		dev_err(xpc_part, "SAL failed to locate the reserved page\n");
-		return NULL;
-	}
-	rp = (struct xpc_rsvd_page *) __va(rp_pa);
-
-	if (rp->partid != sn_partition_id) {
-		dev_err(xpc_part, "the reserved page's partid of %d should be "
-			"%d\n", rp->partid, sn_partition_id);
-		return NULL;
-	}
-
-	rp->version = XPC_RP_VERSION;
-
-	/* establish the actual sizes of the nasid masks */
-	if (rp->SAL_version == 1) {
-		/* SAL_version 1 didn't set the nasids_size field */
-		rp->nasids_size = 128;
-	}
-	xp_nasid_mask_bytes = rp->nasids_size;
-	xp_nasid_mask_words = xp_nasid_mask_bytes / 8;
-
-	/* setup the pointers to the various items in the reserved page */
-	xpc_part_nasids = XPC_RP_PART_NASIDS(rp);
-	xpc_mach_nasids = XPC_RP_MACH_NASIDS(rp);
-	xpc_vars = XPC_RP_VARS(rp);
-	xpc_vars_part = XPC_RP_VARS_PART(rp);
-
-	/*
-	 * Before clearing xpc_vars, see if a page of AMOs had been previously
-	 * allocated. If not we'll need to allocate one and set permissions
-	 * so that cross-partition AMOs are allowed.
-	 *
-	 * The allocated AMO page needs MCA reporting to remain disabled after
-	 * XPC has unloaded.  To make this work, we keep a copy of the pointer
-	 * to this page (i.e., amos_page) in the struct xpc_vars structure,
-	 * which is pointed to by the reserved page, and re-use that saved copy
-	 * on subsequent loads of XPC. This AMO page is never freed, and its
-	 * memory protections are never restricted.
-	 */
-	if ((amos_page = xpc_vars->amos_page) == NULL) {
-		amos_page = (AMO_t *) TO_AMO(uncached_alloc_page(0));
-		if (amos_page == NULL) {
-			dev_err(xpc_part, "can't allocate page of AMOs\n");
-			return NULL;
-		}
-
-		/*
-		 * Open up AMO-R/W to cpu.  This is done for Shub 1.1 systems
-		 * when xpc_allow_IPI_ops() is called via xpc_hb_init().
-		 */
-		if (!enable_shub_wars_1_1()) {
-			ret = sn_change_memprotect(ia64_tpa((u64) amos_page),
-					PAGE_SIZE, SN_MEMPROT_ACCESS_CLASS_1,
-					&nasid_array);
-			if (ret != 0) {
-				dev_err(xpc_part, "can't change memory "
-					"protections\n");
-				uncached_free_page(__IA64_UNCACHED_OFFSET |
-						   TO_PHYS((u64) amos_page));
-				return NULL;
-			}
-		}
-	} else if (!IS_AMO_ADDRESS((u64) amos_page)) {
-		/*
-		 * EFI's XPBOOT can also set amos_page in the reserved page,
-		 * but it happens to leave it as an uncached physical address
-		 * and we need it to be an uncached virtual, so we'll have to
-		 * convert it.
-		 */
-		if (!IS_AMO_PHYS_ADDRESS((u64) amos_page)) {
-			dev_err(xpc_part, "previously used amos_page address "
-				"is bad = 0x%p\n", (void *) amos_page);
-			return NULL;
-		}
-		amos_page = (AMO_t *) TO_AMO((u64) amos_page);
-	}
-
-	/* clear xpc_vars */
-	memset(xpc_vars, 0, sizeof(struct xpc_vars));
-
-	xpc_vars->version = XPC_V_VERSION;
-	xpc_vars->act_nasid = cpuid_to_nasid(0);
-	xpc_vars->act_phys_cpuid = cpu_physical_id(0);
-	xpc_vars->vars_part_pa = __pa(xpc_vars_part);
-	xpc_vars->amos_page_pa = ia64_tpa((u64) amos_page);
-	xpc_vars->amos_page = amos_page;  /* save for next load of XPC */
-
-
-	/* clear xpc_vars_part */
-	memset((u64 *) xpc_vars_part, 0, sizeof(struct xpc_vars_part) *
-							XP_MAX_PARTITIONS);
-
-	/* initialize the activate IRQ related AMO variables */
-	for (i = 0; i < xp_nasid_mask_words; i++) {
-		(void) xpc_IPI_init(XPC_ACTIVATE_IRQ_AMOS + i);
-	}
-
-	/* initialize the engaged remote partitions related AMO variables */
-	(void) xpc_IPI_init(XPC_ENGAGED_PARTITIONS_AMO);
-	(void) xpc_IPI_init(XPC_DISENGAGE_REQUEST_AMO);
-
-	/* timestamp of when reserved page was setup by XPC */
-	rp->stamp = CURRENT_TIME;
-
-	/*
-	 * This signifies to the remote partition that our reserved
-	 * page is initialized.
-	 */
-	rp->vars_pa = __pa(xpc_vars);
-
-	return rp;
-}
-
-
-/*
- * Change protections to allow IPI operations (and AMO operations on
- * Shub 1.1 systems).
- */
-void
-xpc_allow_IPI_ops(void)
-{
-	int node;
-	int nasid;
-
-
-	// >>> Change SH_IPI_ACCESS code to use SAL call once it is available.
-
-	if (is_shub2()) {
-		xpc_sh2_IPI_access0 =
-			(u64) HUB_L((u64 *) LOCAL_MMR_ADDR(SH2_IPI_ACCESS0));
-		xpc_sh2_IPI_access1 =
-			(u64) HUB_L((u64 *) LOCAL_MMR_ADDR(SH2_IPI_ACCESS1));
-		xpc_sh2_IPI_access2 =
-			(u64) HUB_L((u64 *) LOCAL_MMR_ADDR(SH2_IPI_ACCESS2));
-		xpc_sh2_IPI_access3 =
-			(u64) HUB_L((u64 *) LOCAL_MMR_ADDR(SH2_IPI_ACCESS3));
-
-		for_each_online_node(node) {
-			nasid = cnodeid_to_nasid(node);
-			HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS0),
-								-1UL);
-			HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS1),
-								-1UL);
-			HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS2),
-								-1UL);
-			HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS3),
-								-1UL);
-		}
-
-	} else {
-		xpc_sh1_IPI_access =
-			(u64) HUB_L((u64 *) LOCAL_MMR_ADDR(SH1_IPI_ACCESS));
-
-		for_each_online_node(node) {
-			nasid = cnodeid_to_nasid(node);
-			HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH1_IPI_ACCESS),
-								-1UL);
-
-			/*
-			 * Since the BIST collides with memory operations on
-			 * SHUB 1.1 sn_change_memprotect() cannot be used.
-			 */
-			if (enable_shub_wars_1_1()) {
-				/* open up everything */
-				xpc_prot_vec[node] = (u64) HUB_L((u64 *)
-						GLOBAL_MMR_ADDR(nasid,
-						SH1_MD_DQLP_MMR_DIR_PRIVEC0));
-				HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid,
-						SH1_MD_DQLP_MMR_DIR_PRIVEC0),
-								-1UL);
-				HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid,
-						SH1_MD_DQRP_MMR_DIR_PRIVEC0),
-								-1UL);
-			}
-		}
-	}
-}
-
-
-/*
- * Restrict protections to disallow IPI operations (and AMO operations on
- * Shub 1.1 systems).
- */
-void
-xpc_restrict_IPI_ops(void)
-{
-	int node;
-	int nasid;
-
-
-	// >>> Change SH_IPI_ACCESS code to use SAL call once it is available.
-
-	if (is_shub2()) {
-
-		for_each_online_node(node) {
-			nasid = cnodeid_to_nasid(node);
-			HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS0),
-							xpc_sh2_IPI_access0);
-			HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS1),
-							xpc_sh2_IPI_access1);
-			HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS2),
-							xpc_sh2_IPI_access2);
-			HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH2_IPI_ACCESS3),
-							xpc_sh2_IPI_access3);
-		}
-
-	} else {
-
-		for_each_online_node(node) {
-			nasid = cnodeid_to_nasid(node);
-			HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid, SH1_IPI_ACCESS),
-							xpc_sh1_IPI_access);
-
-			if (enable_shub_wars_1_1()) {
-				HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid,
-						SH1_MD_DQLP_MMR_DIR_PRIVEC0),
-							xpc_prot_vec[node]);
-				HUB_S((u64 *) GLOBAL_MMR_ADDR(nasid,
-						SH1_MD_DQRP_MMR_DIR_PRIVEC0),
-							xpc_prot_vec[node]);
-			}
-		}
-	}
-}
-
-
-/*
- * At periodic intervals, scan through all active partitions and ensure
- * their heartbeat is still active.  If not, the partition is deactivated.
- */
-void
-xpc_check_remote_hb(void)
-{
-	struct xpc_vars *remote_vars;
-	struct xpc_partition *part;
-	partid_t partid;
-	bte_result_t bres;
-
-
-	remote_vars = (struct xpc_vars *) xpc_remote_copy_buffer;
-
-	for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
-
-		if (xpc_exiting) {
-			break;
-		}
-
-		if (partid == sn_partition_id) {
-			continue;
-		}
-
-		part = &xpc_partitions[partid];
-
-		if (part->act_state == XPC_P_INACTIVE ||
-				part->act_state == XPC_P_DEACTIVATING) {
-			continue;
-		}
-
-		/* pull the remote_hb cache line */
-		bres = xp_bte_copy(part->remote_vars_pa,
-					(u64) remote_vars,
-					XPC_RP_VARS_SIZE,
-					(BTE_NOTIFY | BTE_WACQUIRE), NULL);
-		if (bres != BTE_SUCCESS) {
-			XPC_DEACTIVATE_PARTITION(part,
-						xpc_map_bte_errors(bres));
-			continue;
-		}
-
-		dev_dbg(xpc_part, "partid = %d, heartbeat = %ld, last_heartbeat"
-			" = %ld, heartbeat_offline = %ld, HB_mask = 0x%lx\n",
-			partid, remote_vars->heartbeat, part->last_heartbeat,
-			remote_vars->heartbeat_offline,
-			remote_vars->heartbeating_to_mask);
-
-		if (((remote_vars->heartbeat == part->last_heartbeat) &&
-			(remote_vars->heartbeat_offline == 0)) ||
-			     !xpc_hb_allowed(sn_partition_id, remote_vars)) {
-
-			XPC_DEACTIVATE_PARTITION(part, xpcNoHeartbeat);
-			continue;
-		}
-
-		part->last_heartbeat = remote_vars->heartbeat;
-	}
-}
-
-
-/*
- * Get a copy of a portion of the remote partition's rsvd page.
- *
- * remote_rp points to a buffer that is cacheline aligned for BTE copies and
- * is large enough to contain a copy of their reserved page header and
- * part_nasids mask.
- */
-static enum xpc_retval
-xpc_get_remote_rp(int nasid, u64 *discovered_nasids,
-		struct xpc_rsvd_page *remote_rp, u64 *remote_rp_pa)
-{
-	int bres, i;
-
-
-	/* get the reserved page's physical address */
-
-	*remote_rp_pa = xpc_get_rsvd_page_pa(nasid);
-	if (*remote_rp_pa == 0) {
-		return xpcNoRsvdPageAddr;
-	}
-
-
-	/* pull over the reserved page header and part_nasids mask */
-	bres = xp_bte_copy(*remote_rp_pa, (u64) remote_rp,
-				XPC_RP_HEADER_SIZE + xp_nasid_mask_bytes,
-				(BTE_NOTIFY | BTE_WACQUIRE), NULL);
-	if (bres != BTE_SUCCESS) {
-		return xpc_map_bte_errors(bres);
-	}
-
-
-	if (discovered_nasids != NULL) {
-		u64 *remote_part_nasids = XPC_RP_PART_NASIDS(remote_rp);
-
-
-		for (i = 0; i < xp_nasid_mask_words; i++) {
-			discovered_nasids[i] |= remote_part_nasids[i];
-		}
-	}
-
-
-	/* check that the partid is for another partition */
-
-	if (remote_rp->partid < 1 ||
-				remote_rp->partid > (XP_MAX_PARTITIONS - 1)) {
-		return xpcInvalidPartid;
-	}
-
-	if (remote_rp->partid == sn_partition_id) {
-		return xpcLocalPartid;
-	}
-
-
-	if (XPC_VERSION_MAJOR(remote_rp->version) !=
-					XPC_VERSION_MAJOR(XPC_RP_VERSION)) {
-		return xpcBadVersion;
-	}
-
-	return xpcSuccess;
-}
-
-
-/*
- * Get a copy of the remote partition's XPC variables from the reserved page.
- *
- * remote_vars points to a buffer that is cacheline aligned for BTE copies and
- * assumed to be of size XPC_RP_VARS_SIZE.
- */
-static enum xpc_retval
-xpc_get_remote_vars(u64 remote_vars_pa, struct xpc_vars *remote_vars)
-{
-	int bres;
-
-
-	if (remote_vars_pa == 0) {
-		return xpcVarsNotSet;
-	}
-
-	/* pull over the cross partition variables */
-	bres = xp_bte_copy(remote_vars_pa, (u64) remote_vars, XPC_RP_VARS_SIZE,
-				(BTE_NOTIFY | BTE_WACQUIRE), NULL);
-	if (bres != BTE_SUCCESS) {
-		return xpc_map_bte_errors(bres);
-	}
-
-	if (XPC_VERSION_MAJOR(remote_vars->version) !=
-					XPC_VERSION_MAJOR(XPC_V_VERSION)) {
-		return xpcBadVersion;
-	}
-
-	return xpcSuccess;
-}
-
-
-/*
- * Update the remote partition's info.
- */
-static void
-xpc_update_partition_info(struct xpc_partition *part, u8 remote_rp_version,
-		struct timespec *remote_rp_stamp, u64 remote_rp_pa,
-		u64 remote_vars_pa, struct xpc_vars *remote_vars)
-{
-	part->remote_rp_version = remote_rp_version;
-	dev_dbg(xpc_part, "  remote_rp_version = 0x%016x\n",
-		part->remote_rp_version);
-
-	part->remote_rp_stamp = *remote_rp_stamp;
-	dev_dbg(xpc_part, "  remote_rp_stamp (tv_sec = 0x%lx tv_nsec = 0x%lx\n",
-		part->remote_rp_stamp.tv_sec, part->remote_rp_stamp.tv_nsec);
-
-	part->remote_rp_pa = remote_rp_pa;
-	dev_dbg(xpc_part, "  remote_rp_pa = 0x%016lx\n", part->remote_rp_pa);
-
-	part->remote_vars_pa = remote_vars_pa;
-	dev_dbg(xpc_part, "  remote_vars_pa = 0x%016lx\n",
-		part->remote_vars_pa);
-
-	part->last_heartbeat = remote_vars->heartbeat;
-	dev_dbg(xpc_part, "  last_heartbeat = 0x%016lx\n",
-		part->last_heartbeat);
-
-	part->remote_vars_part_pa = remote_vars->vars_part_pa;
-	dev_dbg(xpc_part, "  remote_vars_part_pa = 0x%016lx\n",
-		part->remote_vars_part_pa);
-
-	part->remote_act_nasid = remote_vars->act_nasid;
-	dev_dbg(xpc_part, "  remote_act_nasid = 0x%x\n",
-		part->remote_act_nasid);
-
-	part->remote_act_phys_cpuid = remote_vars->act_phys_cpuid;
-	dev_dbg(xpc_part, "  remote_act_phys_cpuid = 0x%x\n",
-		part->remote_act_phys_cpuid);
-
-	part->remote_amos_page_pa = remote_vars->amos_page_pa;
-	dev_dbg(xpc_part, "  remote_amos_page_pa = 0x%lx\n",
-		part->remote_amos_page_pa);
-
-	part->remote_vars_version = remote_vars->version;
-	dev_dbg(xpc_part, "  remote_vars_version = 0x%x\n",
-		part->remote_vars_version);
-}
-
-
-/*
- * Prior code has determined the nasid which generated an IPI.  Inspect
- * that nasid to determine if its partition needs to be activated or
- * deactivated.
- *
- * A partition is consider "awaiting activation" if our partition
- * flags indicate it is not active and it has a heartbeat.  A
- * partition is considered "awaiting deactivation" if our partition
- * flags indicate it is active but it has no heartbeat or it is not
- * sending its heartbeat to us.
- *
- * To determine the heartbeat, the remote nasid must have a properly
- * initialized reserved page.
- */
-static void
-xpc_identify_act_IRQ_req(int nasid)
-{
-	struct xpc_rsvd_page *remote_rp;
-	struct xpc_vars *remote_vars;
-	u64 remote_rp_pa;
-	u64 remote_vars_pa;
-	int remote_rp_version;
-	int reactivate = 0;
-	int stamp_diff;
-	struct timespec remote_rp_stamp = { 0, 0 };
-	partid_t partid;
-	struct xpc_partition *part;
-	enum xpc_retval ret;
-
-
-	/* pull over the reserved page structure */
-
-	remote_rp = (struct xpc_rsvd_page *) xpc_remote_copy_buffer;
-
-	ret = xpc_get_remote_rp(nasid, NULL, remote_rp, &remote_rp_pa);
-	if (ret != xpcSuccess) {
-		dev_warn(xpc_part, "unable to get reserved page from nasid %d, "
-			"which sent interrupt, reason=%d\n", nasid, ret);
-		return;
-	}
-
-	remote_vars_pa = remote_rp->vars_pa;
-	remote_rp_version = remote_rp->version;
-	if (XPC_SUPPORTS_RP_STAMP(remote_rp_version)) {
-		remote_rp_stamp = remote_rp->stamp;
-	}
-	partid = remote_rp->partid;
-	part = &xpc_partitions[partid];
-
-
-	/* pull over the cross partition variables */
-
-	remote_vars = (struct xpc_vars *) xpc_remote_copy_buffer;
-
-	ret = xpc_get_remote_vars(remote_vars_pa, remote_vars);
-	if (ret != xpcSuccess) {
-
-		dev_warn(xpc_part, "unable to get XPC variables from nasid %d, "
-			"which sent interrupt, reason=%d\n", nasid, ret);
-
-		XPC_DEACTIVATE_PARTITION(part, ret);
-		return;
-	}
-
-
-	part->act_IRQ_rcvd++;
-
-	dev_dbg(xpc_part, "partid for nasid %d is %d; IRQs = %d; HB = "
-		"%ld:0x%lx\n", (int) nasid, (int) partid, part->act_IRQ_rcvd,
-		remote_vars->heartbeat, remote_vars->heartbeating_to_mask);
-
-	if (xpc_partition_disengaged(part) &&
-					part->act_state == XPC_P_INACTIVE) {
-
-		xpc_update_partition_info(part, remote_rp_version,
-					&remote_rp_stamp, remote_rp_pa,
-					remote_vars_pa, remote_vars);
-
-		if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version)) {
-			if (xpc_partition_disengage_requested(1UL << partid)) {
-				/*
-				 * Other side is waiting on us to disengage,
-				 * even though we already have.
-				 */
-				return;
-			}
-		} else {
-			/* other side doesn't support disengage requests */
-			xpc_clear_partition_disengage_request(1UL << partid);
-		}
-
-		xpc_activate_partition(part);
-		return;
-	}
-
-	DBUG_ON(part->remote_rp_version == 0);
-	DBUG_ON(part->remote_vars_version == 0);
-
-	if (!XPC_SUPPORTS_RP_STAMP(part->remote_rp_version)) {
-		DBUG_ON(XPC_SUPPORTS_DISENGAGE_REQUEST(part->
-							remote_vars_version));
-
-		if (!XPC_SUPPORTS_RP_STAMP(remote_rp_version)) {
-			DBUG_ON(XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->
-								version));
-			/* see if the other side rebooted */
-			if (part->remote_amos_page_pa ==
-				remote_vars->amos_page_pa &&
-					xpc_hb_allowed(sn_partition_id,
-								remote_vars)) {
-				/* doesn't look that way, so ignore the IPI */
-				return;
-			}
-		}
-
-		/*
-		 * Other side rebooted and previous XPC didn't support the
-		 * disengage request, so we don't need to do anything special.
-		 */
-
-		xpc_update_partition_info(part, remote_rp_version,
-						&remote_rp_stamp, remote_rp_pa,
-						remote_vars_pa, remote_vars);
-		part->reactivate_nasid = nasid;
-		XPC_DEACTIVATE_PARTITION(part, xpcReactivating);
-		return;
-	}
-
-	DBUG_ON(!XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version));
-
-	if (!XPC_SUPPORTS_RP_STAMP(remote_rp_version)) {
-		DBUG_ON(!XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->version));
-
-		/*
-		 * Other side rebooted and previous XPC did support the
-		 * disengage request, but the new one doesn't.
-		 */
-
-		xpc_clear_partition_engaged(1UL << partid);
-		xpc_clear_partition_disengage_request(1UL << partid);
-
-		xpc_update_partition_info(part, remote_rp_version,
-						&remote_rp_stamp, remote_rp_pa,
-						remote_vars_pa, remote_vars);
-		reactivate = 1;
-
-	} else {
-		DBUG_ON(!XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->version));
-
-		stamp_diff = xpc_compare_stamps(&part->remote_rp_stamp,
-							&remote_rp_stamp);
-		if (stamp_diff != 0) {
-			DBUG_ON(stamp_diff >= 0);
-
-			/*
-			 * Other side rebooted and the previous XPC did support
-			 * the disengage request, as does the new one.
-			 */
-
-			DBUG_ON(xpc_partition_engaged(1UL << partid));
-			DBUG_ON(xpc_partition_disengage_requested(1UL <<
-								partid));
-
-			xpc_update_partition_info(part, remote_rp_version,
-						&remote_rp_stamp, remote_rp_pa,
-						remote_vars_pa, remote_vars);
-			reactivate = 1;
-		}
-	}
-
-	if (part->disengage_request_timeout > 0 &&
-					!xpc_partition_disengaged(part)) {
-		/* still waiting on other side to disengage from us */
-		return;
-	}
-
-	if (reactivate) {
-		part->reactivate_nasid = nasid;
-		XPC_DEACTIVATE_PARTITION(part, xpcReactivating);
-
-	} else if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version) &&
-			xpc_partition_disengage_requested(1UL << partid)) {
-		XPC_DEACTIVATE_PARTITION(part, xpcOtherGoingDown);
-	}
-}
-
-
-/*
- * Loop through the activation AMO variables and process any bits
- * which are set.  Each bit indicates a nasid sending a partition
- * activation or deactivation request.
- *
- * Return #of IRQs detected.
- */
-int
-xpc_identify_act_IRQ_sender(void)
-{
-	int word, bit;
-	u64 nasid_mask;
-	u64 nasid;			/* remote nasid */
-	int n_IRQs_detected = 0;
-	AMO_t *act_amos;
-
-
-	act_amos = xpc_vars->amos_page + XPC_ACTIVATE_IRQ_AMOS;
-
-
-	/* scan through act AMO variable looking for non-zero entries */
-	for (word = 0; word < xp_nasid_mask_words; word++) {
-
-		if (xpc_exiting) {
-			break;
-		}
-
-		nasid_mask = xpc_IPI_receive(&act_amos[word]);
-		if (nasid_mask == 0) {
-			/* no IRQs from nasids in this variable */
-			continue;
-		}
-
-		dev_dbg(xpc_part, "AMO[%d] gave back 0x%lx\n", word,
-			nasid_mask);
-
-
-		/*
-		 * If this nasid has been added to the machine since
-		 * our partition was reset, this will retain the
-		 * remote nasid in our reserved pages machine mask.
-		 * This is used in the event of module reload.
-		 */
-		xpc_mach_nasids[word] |= nasid_mask;
-
-
-		/* locate the nasid(s) which sent interrupts */
-
-		for (bit = 0; bit < (8 * sizeof(u64)); bit++) {
-			if (nasid_mask & (1UL << bit)) {
-				n_IRQs_detected++;
-				nasid = XPC_NASID_FROM_W_B(word, bit);
-				dev_dbg(xpc_part, "interrupt from nasid %ld\n",
-					nasid);
-				xpc_identify_act_IRQ_req(nasid);
-			}
-		}
-	}
-	return n_IRQs_detected;
-}
-
-
-/*
- * See if the other side has responded to a partition disengage request
- * from us.
- */
-int
-xpc_partition_disengaged(struct xpc_partition *part)
-{
-	partid_t partid = XPC_PARTID(part);
-	int disengaged;
-
-
-	disengaged = (xpc_partition_engaged(1UL << partid) == 0);
-	if (part->disengage_request_timeout) {
-		if (!disengaged) {
-			if (time_before(jiffies, part->disengage_request_timeout)) {
-				/* timelimit hasn't been reached yet */
-				return 0;
-			}
-
-			/*
-			 * Other side hasn't responded to our disengage
-			 * request in a timely fashion, so assume it's dead.
-			 */
-
-			dev_info(xpc_part, "disengage from remote partition %d "
-				"timed out\n", partid);
-			xpc_disengage_request_timedout = 1;
-			xpc_clear_partition_engaged(1UL << partid);
-			disengaged = 1;
-		}
-		part->disengage_request_timeout = 0;
-
-		/* cancel the timer function, provided it's not us */
-		if (!in_interrupt()) {
-			del_singleshot_timer_sync(&part->
-						      disengage_request_timer);
-		}
-
-		DBUG_ON(part->act_state != XPC_P_DEACTIVATING &&
-					part->act_state != XPC_P_INACTIVE);
-		if (part->act_state != XPC_P_INACTIVE) {
-			xpc_wakeup_channel_mgr(part);
-		}
-
-		if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version)) {
-			xpc_cancel_partition_disengage_request(part);
-		}
-	}
-	return disengaged;
-}
-
-
-/*
- * Mark specified partition as active.
- */
-enum xpc_retval
-xpc_mark_partition_active(struct xpc_partition *part)
-{
-	unsigned long irq_flags;
-	enum xpc_retval ret;
-
-
-	dev_dbg(xpc_part, "setting partition %d to ACTIVE\n", XPC_PARTID(part));
-
-	spin_lock_irqsave(&part->act_lock, irq_flags);
-	if (part->act_state == XPC_P_ACTIVATING) {
-		part->act_state = XPC_P_ACTIVE;
-		ret = xpcSuccess;
-	} else {
-		DBUG_ON(part->reason == xpcSuccess);
-		ret = part->reason;
-	}
-	spin_unlock_irqrestore(&part->act_lock, irq_flags);
-
-	return ret;
-}
-
-
-/*
- * Notify XPC that the partition is down.
- */
-void
-xpc_deactivate_partition(const int line, struct xpc_partition *part,
-				enum xpc_retval reason)
-{
-	unsigned long irq_flags;
-
-
-	spin_lock_irqsave(&part->act_lock, irq_flags);
-
-	if (part->act_state == XPC_P_INACTIVE) {
-		XPC_SET_REASON(part, reason, line);
-		spin_unlock_irqrestore(&part->act_lock, irq_flags);
-		if (reason == xpcReactivating) {
-			/* we interrupt ourselves to reactivate partition */
-			xpc_IPI_send_reactivate(part);
-		}
-		return;
-	}
-	if (part->act_state == XPC_P_DEACTIVATING) {
-		if ((part->reason == xpcUnloading && reason != xpcUnloading) ||
-					reason == xpcReactivating) {
-			XPC_SET_REASON(part, reason, line);
-		}
-		spin_unlock_irqrestore(&part->act_lock, irq_flags);
-		return;
-	}
-
-	part->act_state = XPC_P_DEACTIVATING;
-	XPC_SET_REASON(part, reason, line);
-
-	spin_unlock_irqrestore(&part->act_lock, irq_flags);
-
-	if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version)) {
-		xpc_request_partition_disengage(part);
-		xpc_IPI_send_disengage(part);
-
-		/* set a timelimit on the disengage request */
-		part->disengage_request_timeout = jiffies +
-					(xpc_disengage_request_timelimit * HZ);
-		part->disengage_request_timer.expires =
-					part->disengage_request_timeout;
-		add_timer(&part->disengage_request_timer);
-	}
-
-	dev_dbg(xpc_part, "bringing partition %d down, reason = %d\n",
-		XPC_PARTID(part), reason);
-
-	xpc_partition_going_down(part, reason);
-}
-
-
-/*
- * Mark specified partition as inactive.
- */
-void
-xpc_mark_partition_inactive(struct xpc_partition *part)
-{
-	unsigned long irq_flags;
-
-
-	dev_dbg(xpc_part, "setting partition %d to INACTIVE\n",
-		XPC_PARTID(part));
-
-	spin_lock_irqsave(&part->act_lock, irq_flags);
-	part->act_state = XPC_P_INACTIVE;
-	spin_unlock_irqrestore(&part->act_lock, irq_flags);
-	part->remote_rp_pa = 0;
-}
-
-
-/*
- * SAL has provided a partition and machine mask.  The partition mask
- * contains a bit for each even nasid in our partition.  The machine
- * mask contains a bit for each even nasid in the entire machine.
- *
- * Using those two bit arrays, we can determine which nasids are
- * known in the machine.  Each should also have a reserved page
- * initialized if they are available for partitioning.
- */
-void
-xpc_discovery(void)
-{
-	void *remote_rp_base;
-	struct xpc_rsvd_page *remote_rp;
-	struct xpc_vars *remote_vars;
-	u64 remote_rp_pa;
-	u64 remote_vars_pa;
-	int region;
-	int region_size;
-	int max_regions;
-	int nasid;
-	struct xpc_rsvd_page *rp;
-	partid_t partid;
-	struct xpc_partition *part;
-	u64 *discovered_nasids;
-	enum xpc_retval ret;
-
-
-	remote_rp = xpc_kmalloc_cacheline_aligned(XPC_RP_HEADER_SIZE +
-						xp_nasid_mask_bytes,
-						GFP_KERNEL, &remote_rp_base);
-	if (remote_rp == NULL) {
-		return;
-	}
-	remote_vars = (struct xpc_vars *) remote_rp;
-
-
-	discovered_nasids = kzalloc(sizeof(u64) * xp_nasid_mask_words,
-							GFP_KERNEL);
-	if (discovered_nasids == NULL) {
-		kfree(remote_rp_base);
-		return;
-	}
-
-	rp = (struct xpc_rsvd_page *) xpc_rsvd_page;
-
-	/*
-	 * The term 'region' in this context refers to the minimum number of
-	 * nodes that can comprise an access protection grouping. The access
-	 * protection is in regards to memory, IOI and IPI.
-	 */
-	max_regions = 64;
-	region_size = sn_region_size;
-
-	switch (region_size) {
-	case 128:
-		max_regions *= 2;
-	case 64:
-		max_regions *= 2;
-	case 32:
-		max_regions *= 2;
-		region_size = 16;
-		DBUG_ON(!is_shub2());
-	}
-
-	for (region = 0; region < max_regions; region++) {
-
-		if ((volatile int) xpc_exiting) {
-			break;
-		}
-
-		dev_dbg(xpc_part, "searching region %d\n", region);
-
-		for (nasid = (region * region_size * 2);
-		     nasid < ((region + 1) * region_size * 2);
-		     nasid += 2) {
-
-			if ((volatile int) xpc_exiting) {
-				break;
-			}
-
-			dev_dbg(xpc_part, "checking nasid %d\n", nasid);
-
-
-			if (XPC_NASID_IN_ARRAY(nasid, xpc_part_nasids)) {
-				dev_dbg(xpc_part, "PROM indicates Nasid %d is "
-					"part of the local partition; skipping "
-					"region\n", nasid);
-				break;
-			}
-
-			if (!(XPC_NASID_IN_ARRAY(nasid, xpc_mach_nasids))) {
-				dev_dbg(xpc_part, "PROM indicates Nasid %d was "
-					"not on Numa-Link network at reset\n",
-					nasid);
-				continue;
-			}
-
-			if (XPC_NASID_IN_ARRAY(nasid, discovered_nasids)) {
-				dev_dbg(xpc_part, "Nasid %d is part of a "
-					"partition which was previously "
-					"discovered\n", nasid);
-				continue;
-			}
-
-
-			/* pull over the reserved page structure */
-
-			ret = xpc_get_remote_rp(nasid, discovered_nasids,
-					      remote_rp, &remote_rp_pa);
-			if (ret != xpcSuccess) {
-				dev_dbg(xpc_part, "unable to get reserved page "
-					"from nasid %d, reason=%d\n", nasid,
-					ret);
-
-				if (ret == xpcLocalPartid) {
-					break;
-				}
-				continue;
-			}
-
-			remote_vars_pa = remote_rp->vars_pa;
-
-			partid = remote_rp->partid;
-			part = &xpc_partitions[partid];
-
-
-			/* pull over the cross partition variables */
-
-			ret = xpc_get_remote_vars(remote_vars_pa, remote_vars);
-			if (ret != xpcSuccess) {
-				dev_dbg(xpc_part, "unable to get XPC variables "
-					"from nasid %d, reason=%d\n", nasid,
-					ret);
-
-				XPC_DEACTIVATE_PARTITION(part, ret);
-				continue;
-			}
-
-			if (part->act_state != XPC_P_INACTIVE) {
-				dev_dbg(xpc_part, "partition %d on nasid %d is "
-					"already activating\n", partid, nasid);
-				break;
-			}
-
-			/*
-			 * Register the remote partition's AMOs with SAL so it
-			 * can handle and cleanup errors within that address
-			 * range should the remote partition go down. We don't
-			 * unregister this range because it is difficult to
-			 * tell when outstanding writes to the remote partition
-			 * are finished and thus when it is thus safe to
-			 * unregister. This should not result in wasted space
-			 * in the SAL xp_addr_region table because we should
-			 * get the same page for remote_act_amos_pa after
-			 * module reloads and system reboots.
-			 */
-			if (sn_register_xp_addr_region(
-					    remote_vars->amos_page_pa,
-							PAGE_SIZE, 1) < 0) {
-				dev_dbg(xpc_part, "partition %d failed to "
-					"register xp_addr region 0x%016lx\n",
-					partid, remote_vars->amos_page_pa);
-
-				XPC_SET_REASON(part, xpcPhysAddrRegFailed,
-						__LINE__);
-				break;
-			}
-
-			/*
-			 * The remote nasid is valid and available.
-			 * Send an interrupt to that nasid to notify
-			 * it that we are ready to begin activation.
-			 */
-			dev_dbg(xpc_part, "sending an interrupt to AMO 0x%lx, "
-				"nasid %d, phys_cpuid 0x%x\n",
-				remote_vars->amos_page_pa,
-				remote_vars->act_nasid,
-				remote_vars->act_phys_cpuid);
-
-			if (XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->
-								version)) {
-				part->remote_amos_page_pa =
-						remote_vars->amos_page_pa;
-				xpc_mark_partition_disengaged(part);
-				xpc_cancel_partition_disengage_request(part);
-			}
-			xpc_IPI_send_activate(remote_vars);
-		}
-	}
-
-	kfree(discovered_nasids);
-	kfree(remote_rp_base);
-}
-
-
-/*
- * Given a partid, get the nasids owned by that partition from the
- * remote partition's reserved page.
- */
-enum xpc_retval
-xpc_initiate_partid_to_nasids(partid_t partid, void *nasid_mask)
-{
-	struct xpc_partition *part;
-	u64 part_nasid_pa;
-	int bte_res;
-
-
-	part = &xpc_partitions[partid];
-	if (part->remote_rp_pa == 0) {
-		return xpcPartitionDown;
-	}
-
-	memset(nasid_mask, 0, XP_NASID_MASK_BYTES);
-
-	part_nasid_pa = (u64) XPC_RP_PART_NASIDS(part->remote_rp_pa);
-
-	bte_res = xp_bte_copy(part_nasid_pa, (u64) nasid_mask,
-			xp_nasid_mask_bytes, (BTE_NOTIFY | BTE_WACQUIRE), NULL);
-
-	return xpc_map_bte_errors(bte_res);
-}
-