/*
* 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) 2004-2005 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 "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_COMPACT_NODES];
/* this partition's reserved page */
struct xpc_rsvd_page *xpc_rsvd_page;
/* this partition's XPC variables (within the reserved page) */
struct xpc_vars *xpc_vars;
struct xpc_vars_part *xpc_vars_part;
/*
* 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 the remote partitions
* reserved page or XPC variables.
*
* xpc_discovery runs only once and is a seperate thread that is
* very likely going to be processing in parallel with receiving
* interrupts.
*/
char ____cacheline_aligned
xpc_remote_copy_buffer[XPC_RSVD_PAGE_ALIGNED_SIZE];
/* systune related variables */
int xpc_hb_interval = XPC_HB_DEFAULT_INTERVAL;
int xpc_hb_check_interval = XPC_HB_CHECK_DEFAULT_TIMEOUT;
/*
* 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, u64 buf, u64 buf_size)
{
bte_result_t bte_res;
s64 status;
u64 cookie = 0;
u64 rp_pa = nasid; /* seed with nasid */
u64 len = 0;
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 (len > buf_size) {
dev_err(xpc_part, "len (=0x%016lx) > buf_size\n", len);
status = SALRET_ERROR;
break;
}
bte_res = xp_bte_copy(rp_pa, ia64_tpa(buf), buf_size,
(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;
}
}
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, next_cl, nasid_array = 0;
int i, ret;
/* get the local reserved page's address */
rp_pa = xpc_get_rsvd_page_pa(cnodeid_to_nasid(0),
(u64) xpc_remote_copy_buffer,
XPC_RSVD_PAGE_ALIGNED_SIZE);
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;
/*
* Place the XPC variables on the cache line following the
* reserved page structure.
*/
next_cl = (u64) rp + XPC_RSVD_PAGE_ALIGNED_SIZE;
xpc_vars = (struct xpc_vars *) next_cl;
/*
* 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);
}
memset(xpc_vars, 0, sizeof(struct xpc_vars));
/*
* Place the XPC per partition specific variables on the cache line
* following the XPC variables structure.
*/
next_cl += XPC_VARS_ALIGNED_SIZE;
memset((u64 *) next_cl, 0, sizeof(struct xpc_vars_part) *
XP_MAX_PARTITIONS);
xpc_vars_part = (struct xpc_vars_part *) next_cl;
xpc_vars->vars_part_pa = __pa(next_cl);
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->amos_page = amos_page; /* save for next load of XPC */
/*
* Initialize the activation related AMO variables.
*/
xpc_vars->act_amos = xpc_IPI_init(XP_MAX_PARTITIONS);
for (i = 1; i < XP_NASID_MASK_WORDS; i++) {
xpc_IPI_init(i + XP_MAX_PARTITIONS);
}
/* export AMO page's physical address to other partitions */
xpc_vars->amos_page_pa = ia64_tpa((u64) xpc_vars->amos_page);
/*
* 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 (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,
ia64_tpa((u64) remote_vars),
XPC_VARS_ALIGNED_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, kdb_status = %ld, HB_mask = 0x%lx\n", partid,
remote_vars->heartbeat, part->last_heartbeat,
remote_vars->kdb_status,
remote_vars->heartbeating_to_mask);
if (((remote_vars->heartbeat == part->last_heartbeat) &&
(remote_vars->kdb_status == 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 the remote partition's rsvd page.
*
* remote_rp points to a buffer that is cacheline aligned for BTE copies and
* assumed to be of size XPC_RSVD_PAGE_ALIGNED_SIZE.
*/
static enum xpc_retval
xpc_get_remote_rp(int nasid, u64 *discovered_nasids,
struct xpc_rsvd_page *remote_rp, u64 *remote_rsvd_page_pa)
{
int bres, i;
/* get the reserved page's physical address */
*remote_rsvd_page_pa = xpc_get_rsvd_page_pa(nasid, (u64) remote_rp,
XPC_RSVD_PAGE_ALIGNED_SIZE);
if (*remote_rsvd_page_pa == 0) {
return xpcNoRsvdPageAddr;
}
/* pull over the reserved page structure */
bres = xp_bte_copy(*remote_rsvd_page_pa, ia64_tpa((u64) remote_rp),
XPC_RSVD_PAGE_ALIGNED_SIZE,
(BTE_NOTIFY | BTE_WACQUIRE), NULL);
if (bres != BTE_SUCCESS) {
return xpc_map_bte_errors(bres);
}
if (discovered_nasids != NULL) {
for (i = 0; i < XP_NASID_MASK_WORDS; i++) {
discovered_nasids[i] |= remote_rp->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.
*
* remote_vars points to a buffer that is cacheline aligned for BTE copies and
* assumed to be of size XPC_VARS_ALIGNED_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, ia64_tpa((u64) remote_vars),
XPC_VARS_ALIGNED_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;
}
/*
* Prior code has determine 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_rsvd_page_pa;
u64 remote_vars_pa;
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_rsvd_page_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;
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 (part->act_state == XPC_P_INACTIVE) {
part->remote_rp_pa = remote_rsvd_page_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);
xpc_activate_partition(part);
} else if (part->remote_amos_page_pa != remote_vars->amos_page_pa ||
!XPC_HB_ALLOWED(sn_partition_id, remote_vars)) {
part->reactivate_nasid = nasid;
XPC_DEACTIVATE_PARTITION(part, xpcReactivating);
}
}
/*
* 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;
struct xpc_rsvd_page *rp = (struct xpc_rsvd_page *) xpc_rsvd_page;
act_amos = xpc_vars->act_amos;
/* scan through act AMO variable looking for non-zero entries */
for (word = 0; word < XP_NASID_MASK_WORDS; word++) {
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.
*/
rp->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;
}
/*
* 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;
partid_t partid = XPC_PARTID(part);
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);
XPC_DISALLOW_HB(partid, xpc_vars);
dev_dbg(xpc_part, "bringing partition %d down, reason = %d\n", partid,
reason);
xpc_partition_down(part, reason);
}
/*
* Mark specified partition as active.
*/
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_rsvd_page_pa;
u64 remote_vars_pa;
int region;
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_RSVD_PAGE_ALIGNED_SIZE,
GFP_KERNEL, &remote_rp_base);
if (remote_rp == NULL) {
return;
}
remote_vars = (struct xpc_vars *) remote_rp;
discovered_nasids = kmalloc(sizeof(u64) * XP_NASID_MASK_WORDS,
GFP_KERNEL);
if (discovered_nasids == NULL) {
kfree(remote_rp_base);
return;
}
memset(discovered_nasids, 0, sizeof(u64) * XP_NASID_MASK_WORDS);
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.
*/
//>>> move the next two #defines into either include/asm-ia64/sn/arch.h or
//>>> include/asm-ia64/sn/addrs.h
#define SH1_MAX_REGIONS 64
#define SH2_MAX_REGIONS 256
max_regions = is_shub2() ? SH2_MAX_REGIONS : SH1_MAX_REGIONS;
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 * sn_region_size * 2);
nasid < ((region + 1) * sn_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, rp->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, rp->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_rsvd_page_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);
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;
}
part_nasid_pa = part->remote_rp_pa +
(u64) &((struct xpc_rsvd_page *) 0)->part_nasids;
bte_res = xp_bte_copy(part_nasid_pa, ia64_tpa((u64) nasid_mask),
L1_CACHE_ALIGN(XP_NASID_MASK_BYTES),
(BTE_NOTIFY | BTE_WACQUIRE), NULL);
return xpc_map_bte_errors(bte_res);
}
