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sgi-xp: prepare xpc_rsvd_page to work on either sn2 or uv hardware

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Prepare XPC's reserved page header to work for either sn2 or uv.

Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dean Nelson 2008-07-29 22:34:05 -07:00 committed by Linus Torvalds
parent 908787db9b
commit 94bd2708d4
7 changed files with 268 additions and 134 deletions
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3
drivers/misc/sgi-xp/Makefile
View file

@ -7,6 +7,7 @@ xp-y := xp_main.o xp_uv.o
xp-$(CONFIG_IA64) += xp_sn2.o xp_nofault.o
obj-$(CONFIG_SGI_XP) += xpc.o
xpc-y := xpc_main.o xpc_channel.o xpc_partition.o
xpc-y := xpc_main.o xpc_uv.o xpc_channel.o xpc_partition.o
xpc-$(CONFIG_IA64) += xpc_sn2.o
obj-$(CONFIG_SGI_XP) += xpnet.o

5
drivers/misc/sgi-xp/xp.h
View file

@ -220,9 +220,10 @@ enum xp_retval {
xpBteCopyError, /* 52: bte_copy() returned error */
xpSalError, /* 53: sn SAL error */
xpRsvdPageNotSet, /* 54: the reserved page is not set up */
xpUnsupported, /* 54: unsupported functionality or resource */
xpUnknownReason /* 55: unknown reason - must be last in enum */
xpUnsupported, /* 55: unsupported functionality or resource */
xpUnknownReason /* 56: unknown reason - must be last in enum */
};
/*

57
drivers/misc/sgi-xp/xpc.h
View file

@ -71,11 +71,11 @@
*
* reserved page header
*
* The first cacheline of the reserved page contains the header
* (struct xpc_rsvd_page). Before SAL initialization has completed,
* The first two 64-byte cachelines of the reserved page contain the
* header (struct xpc_rsvd_page). Before SAL initialization has completed,
* SAL has set up the following fields of the reserved page header:
* SAL_signature, SAL_version, partid, and nasids_size. The other
* fields are set up by XPC. (xpc_rsvd_page points to the local
* SAL_signature, SAL_version, SAL_partid, and SAL_nasids_size. The
* other fields are set up by XPC. (xpc_rsvd_page points to the local
* partition's reserved page.)
*
* part_nasids mask
@ -89,11 +89,11 @@
* nasids. The part_nasids mask is located starting at the first cacheline
* following the reserved page header. The mach_nasids mask follows right
* after the part_nasids mask. The size in bytes of each mask is reflected
* by the reserved page header field 'nasids_size'. (Local partition's
* by the reserved page header field 'SAL_nasids_size'. (Local partition's
* mask pointers are xpc_part_nasids and xpc_mach_nasids.)
*
* vars
* vars part
* vars (ia64-sn2 only)
* vars part (ia64-sn2 only)
*
* Immediately following the mach_nasids mask are the XPC variables
* required by other partitions. First are those that are generic to all
@ -101,25 +101,31 @@
* which are partition specific (vars part). These are setup by XPC.
* (Local partition's vars pointers are xpc_vars and xpc_vars_part.)
*
* Note: Until vars_pa is set, the partition XPC code has not been initialized.
* Note: Until 'stamp' is set non-zero, the partition XPC code has not been
* initialized.
*/
struct xpc_rsvd_page {
u64 SAL_signature; /* SAL: unique signature */
u64 SAL_version; /* SAL: version */
u8 partid; /* SAL: partition ID */
short SAL_partid; /* SAL: partition ID */
short max_npartitions; /* value of XPC_MAX_PARTITIONS */
u8 version;
u8 pad1[6]; /* align to next u64 in cacheline */
u64 vars_pa; /* physical address of struct xpc_vars */
u8 pad1[3]; /* align to next u64 in 1st 64-byte cacheline */
union {
u64 vars_pa; /* physical address of struct xpc_vars */
u64 activate_mq_gpa; /* global phys address of activate_mq */
} sn;
struct timespec stamp; /* time when reserved page was setup by XPC */
u64 pad2[9]; /* align to last u64 in cacheline */
u64 nasids_size; /* SAL: size of each nasid mask in bytes */
u64 pad2[9]; /* align to last u64 in 2nd 64-byte cacheline */
u64 SAL_nasids_size; /* SAL: size of each nasid mask in bytes */
};
#define XPC_RP_VERSION _XPC_VERSION(1, 1) /* version 1.1 of the reserved page */
#define XPC_RP_VERSION _XPC_VERSION(2, 0) /* version 2.0 of the reserved page */
#define XPC_SUPPORTS_RP_STAMP(_version) \
(_version >= _XPC_VERSION(1, 1))
#define ZERO_STAMP ((struct timespec){0, 0})
/*
* compare stamps - the return value is:
*
@ -218,10 +224,10 @@ xpc_disallow_hb(short partid, struct xpc_vars *vars)
*
* An array of these structures, one per partition, will be defined. As a
* partition becomes active XPC will copy the array entry corresponding to
* itself from that partition. It is desirable that the size of this
* structure evenly divide into a cacheline, such that none of the entries
* in this array crosses a cacheline boundary. As it is now, each entry
* occupies half a cacheline.
* itself from that partition. It is desirable that the size of this structure
* evenly divides into a 128-byte cacheline, such that none of the entries in
* this array crosses a 128-byte cacheline boundary. As it is now, each entry
* occupies a 64-byte cacheline.
*/
struct xpc_vars_part {
u64 magic;
@ -632,16 +638,25 @@ extern void xpc_activate_kthreads(struct xpc_channel *, int);
extern void xpc_create_kthreads(struct xpc_channel *, int, int);
extern void xpc_disconnect_wait(int);
extern enum xp_retval (*xpc_rsvd_page_init) (struct xpc_rsvd_page *);
/* found in xpc_sn2.c */
extern void xpc_init_sn2(void);
extern struct xpc_vars *xpc_vars; /*>>> eliminate from here */
extern struct xpc_vars_part *xpc_vars_part; /*>>> eliminate from here */
/* found in xpc_uv.c */
extern void xpc_init_uv(void);
/* found in xpc_partition.c */
extern int xpc_exiting;
extern struct xpc_vars *xpc_vars;
extern int xp_nasid_mask_words;
extern struct xpc_rsvd_page *xpc_rsvd_page;
extern struct xpc_vars_part *xpc_vars_part;
extern struct xpc_partition *xpc_partitions;
extern char *xpc_remote_copy_buffer;
extern void *xpc_remote_copy_buffer_base;
extern void *xpc_kmalloc_cacheline_aligned(size_t, gfp_t, void **);
extern struct xpc_rsvd_page *xpc_rsvd_page_init(void);
extern struct xpc_rsvd_page *xpc_setup_rsvd_page(void);
extern void xpc_allow_IPI_ops(void);
extern void xpc_restrict_IPI_ops(void);
extern int xpc_identify_act_IRQ_sender(void);

27
drivers/misc/sgi-xp/xpc_main.c
View file

@ -175,6 +175,8 @@ static struct notifier_block xpc_die_notifier = {
.notifier_call = xpc_system_die,
};
enum xp_retval (*xpc_rsvd_page_init) (struct xpc_rsvd_page *rp);
/*
* Timer function to enforce the timelimit on the partition disengage request.
*/
@ -949,7 +951,7 @@ xpc_do_exit(enum xp_retval reason)
DBUG_ON(xpc_partition_engaged(-1UL));
/* indicate to others that our reserved page is uninitialized */
xpc_rsvd_page->vars_pa = 0;
xpc_rsvd_page->stamp = ZERO_STAMP;
/* now it's time to eliminate our heartbeat */
del_timer_sync(&xpc_hb_timer);
@ -1128,8 +1130,24 @@ xpc_init(void)
struct task_struct *kthread;
size_t buf_size;
if (!ia64_platform_is("sn2"))
if (is_shub()) {
/*
* The ia64-sn2 architecture supports at most 64 partitions.
* And the inability to unregister remote AMOs restricts us
* further to only support exactly 64 partitions on this
* architecture, no less.
*/
if (xp_max_npartitions != 64)
return -EINVAL;
xpc_init_sn2();
} else if (is_uv()) {
xpc_init_uv();
} else {
return -ENODEV;
}
snprintf(xpc_part->bus_id, BUS_ID_SIZE, "part");
snprintf(xpc_chan->bus_id, BUS_ID_SIZE, "chan");
@ -1214,7 +1232,7 @@ xpc_init(void)
* other partitions to discover we are alive and establish initial
* communications.
*/
xpc_rsvd_page = xpc_rsvd_page_init();
xpc_rsvd_page = xpc_setup_rsvd_page();
if (xpc_rsvd_page == NULL) {
dev_err(xpc_part, "can't setup our reserved page\n");
ret = -EBUSY;
@ -1273,7 +1291,8 @@ xpc_init(void)
/* initialization was not successful */
out_4:
/* indicate to others that our reserved page is uninitialized */
xpc_rsvd_page->vars_pa = 0;
xpc_rsvd_page->stamp = ZERO_STAMP;
del_timer_sync(&xpc_hb_timer);
(void)unregister_die_notifier(&xpc_die_notifier);
(void)unregister_reboot_notifier(&xpc_reboot_notifier);

151
drivers/misc/sgi-xp/xpc_partition.c
View file

@ -20,7 +20,6 @@
#include <linux/cache.h>
#include <linux/mmzone.h>
#include <linux/nodemask.h>
#include <asm/uncached.h>
#include <asm/sn/intr.h>
#include <asm/sn/sn_sal.h>
#include <asm/sn/nodepda.h>
@ -44,11 +43,10 @@ u64 xpc_prot_vec[MAX_NUMNODES];
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 */
/* >>> next two variables should be 'xpc_' if they remain here */
static int xp_sizeof_nasid_mask; /* actual size in bytes of nasid mask */
int xp_nasid_mask_words; /* actual size in words of nasid mask */
struct xpc_partition *xpc_partitions;
@ -150,12 +148,10 @@ xpc_get_rsvd_page_pa(int nasid)
* communications.
*/
struct xpc_rsvd_page *
xpc_rsvd_page_init(void)
xpc_setup_rsvd_page(void)
{
struct xpc_rsvd_page *rp;
AMO_t *amos_page;
u64 rp_pa, nasid_array = 0;
int i, ret;
u64 rp_pa;
/* get the local reserved page's address */
@ -168,110 +164,44 @@ xpc_rsvd_page_init(void)
}
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);
if (rp->SAL_version < 3) {
/* SAL_versions < 3 had a SAL_partid defined as a u8 */
rp->SAL_partid &= 0xff;
}
BUG_ON(rp->SAL_partid != sn_partition_id);
if (rp->SAL_partid < 0 || rp->SAL_partid >= xp_max_npartitions) {
dev_err(xpc_part, "the reserved page's partid of %d is outside "
"supported range (< 0 || >= %d)\n", rp->SAL_partid,
xp_max_npartitions);
return NULL;
}
rp->version = XPC_RP_VERSION;
rp->max_npartitions = xp_max_npartitions;
/* 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;
rp->SAL_nasids_size = 128;
}
xp_nasid_mask_bytes = rp->nasids_size;
xp_nasid_mask_words = xp_nasid_mask_bytes / 8;
xp_sizeof_nasid_mask = rp->SAL_nasids_size;
xp_nasid_mask_words = DIV_ROUND_UP(xp_sizeof_nasid_mask,
BYTES_PER_WORD);
/* 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.
*/
amos_page = xpc_vars->amos_page;
if (amos_page == NULL) {
amos_page = (AMO_t *)TO_AMO(uncached_alloc_page(0, 1));
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), 1);
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_npartitions);
/* 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;
if (xpc_rsvd_page_init(rp) != xpSuccess)
return NULL;
/*
* Set timestamp of when reserved page was setup by XPC.
* This signifies to the remote partition that our reserved
* page is initialized.
*/
rp->vars_pa = __pa(xpc_vars);
rp->stamp = CURRENT_TIME;
return rp;
}
@ -465,7 +395,7 @@ xpc_get_remote_rp(int nasid, u64 *discovered_nasids,
/* pull over the reserved page header and part_nasids mask */
ret = xp_remote_memcpy(remote_rp, (void *)*remote_rp_pa,
XPC_RP_HEADER_SIZE + xp_nasid_mask_bytes);
XPC_RP_HEADER_SIZE + xp_sizeof_nasid_mask);
if (ret != xpSuccess)
return ret;
@ -476,19 +406,28 @@ xpc_get_remote_rp(int nasid, u64 *discovered_nasids,
discovered_nasids[i] |= remote_part_nasids[i];
}
/* check that the partid is for another partition */
/* check that the partid is valid and is for another partition */
if (remote_rp->partid < 0 || remote_rp->partid >= xp_max_npartitions)
if (remote_rp->SAL_partid < 0 ||
remote_rp->SAL_partid >= xp_max_npartitions) {
return xpInvalidPartid;
}
if (remote_rp->partid == sn_partition_id)
if (remote_rp->SAL_partid == sn_partition_id)
return xpLocalPartid;
/* see if the rest of the reserved page has been set up by XPC */
if (timespec_equal(&remote_rp->stamp, &ZERO_STAMP))
return xpRsvdPageNotSet;
if (XPC_VERSION_MAJOR(remote_rp->version) !=
XPC_VERSION_MAJOR(XPC_RP_VERSION)) {
return xpBadVersion;
}
if (remote_rp->max_npartitions <= sn_partition_id)
return xpInvalidPartid;
return xpSuccess;
}
@ -592,7 +531,7 @@ xpc_identify_act_IRQ_req(int nasid)
int remote_rp_version;
int reactivate = 0;
int stamp_diff;
struct timespec remote_rp_stamp = { 0, 0 };
struct timespec remote_rp_stamp = { 0, 0 }; /*>>> ZERO_STAMP */
short partid;
struct xpc_partition *part;
enum xp_retval ret;
@ -608,12 +547,12 @@ xpc_identify_act_IRQ_req(int nasid)
return;
}
remote_vars_pa = remote_rp->vars_pa;
remote_vars_pa = remote_rp->sn.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;
partid = remote_rp->SAL_partid;
part = &xpc_partitions[partid];
/* pull over the cross partition variables */
@ -977,7 +916,7 @@ xpc_discovery(void)
enum xp_retval ret;
remote_rp = xpc_kmalloc_cacheline_aligned(XPC_RP_HEADER_SIZE +
xp_nasid_mask_bytes,
xp_sizeof_nasid_mask,
GFP_KERNEL, &remote_rp_base);
if (remote_rp == NULL)
return;
@ -1063,9 +1002,9 @@ xpc_discovery(void)
continue;
}
remote_vars_pa = remote_rp->vars_pa;
remote_vars_pa = remote_rp->sn.vars_pa;
partid = remote_rp->partid;
partid = remote_rp->SAL_partid;
part = &xpc_partitions[partid];
/* pull over the cross partition variables */
@ -1155,5 +1094,5 @@ xpc_initiate_partid_to_nasids(short partid, void *nasid_mask)
part_nasid_pa = (u64)XPC_RP_PART_NASIDS(part->remote_rp_pa);
return xp_remote_memcpy(nasid_mask, (void *)part_nasid_pa,
xp_nasid_mask_bytes);
xp_sizeof_nasid_mask);
}

111
drivers/misc/sgi-xp/xpc_sn2.c Normal file
View file

@ -0,0 +1,111 @@
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
*/
/*
* Cross Partition Communication (XPC) sn2-based functions.
*
* Architecture specific implementation of common functions.
*
*/
#include <linux/kernel.h>
#include <asm/uncached.h>
#include <asm/sn/sn_sal.h>
#include "xpc.h"
struct xpc_vars *xpc_vars;
struct xpc_vars_part *xpc_vars_part;
static enum xp_retval
xpc_rsvd_page_init_sn2(struct xpc_rsvd_page *rp)
{
AMO_t *amos_page;
u64 nasid_array = 0;
int i;
int ret;
xpc_vars = XPC_RP_VARS(rp);
rp->sn.vars_pa = __pa(xpc_vars);
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.
*/
amos_page = xpc_vars->amos_page;
if (amos_page == NULL) {
amos_page = (AMO_t *)TO_AMO(uncached_alloc_page(0, 1));
if (amos_page == NULL) {
dev_err(xpc_part, "can't allocate page of AMOs\n");
return xpNoMemory;
}
/*
* 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), 1);
return xpSalError;
}
}
}
/* 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_npartitions);
/* 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);
return xpSuccess;
}
void
xpc_init_sn2(void)
{
xpc_rsvd_page_init = xpc_rsvd_page_init_sn2;
}
void
xpc_exit_sn2(void)
{
}

48
drivers/misc/sgi-xp/xpc_uv.c Normal file
View file

@ -0,0 +1,48 @@
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
*/
/*
* Cross Partition Communication (XPC) uv-based functions.
*
* Architecture specific implementation of common functions.
*
*/
#include <linux/kernel.h>
/* >>> #include <gru/grukservices.h> */
/* >>> uv_gpa() is defined in <gru/grukservices.h> */
#define uv_gpa(_a) ((unsigned long)_a)
/* >>> temporarily define next three items for xpc.h */
#define SGI_XPC_ACTIVATE 23
#define SGI_XPC_NOTIFY 24
#define sn_send_IPI_phys(_a, _b, _c, _d)
#include "xpc.h"
static void *xpc_activate_mq;
static enum xp_retval
xpc_rsvd_page_init_uv(struct xpc_rsvd_page *rp)
{
/* >>> need to have established xpc_activate_mq earlier */
rp->sn.activate_mq_gpa = uv_gpa(xpc_activate_mq);
return xpSuccess;
}
void
xpc_init_uv(void)
{
xpc_rsvd_page_init = xpc_rsvd_page_init_uv;
}
void
xpc_exit_uv(void)
{
}