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Commit 33ba3c77 authored by Dean Nelson's avatar Dean Nelson Committed by Linus Torvalds
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sgi-xp: isolate xpc_vars structure to sn2 only 

Isolate the xpc_vars structure of XPC's reserved page to sn2 only.
Signed-off-by: default avatarDean Nelson <dcn@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e17d416b
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Showing with 1433 additions and 1255 deletions
drivers/misc/sgi-xp/xpc.h
View file @ 33ba3c77
......@@ -159,10 +159,10 @@ xpc_compare_stamps(struct timespec *stamp1, struct timespec *stamp2)
* reflected by incrementing either the major or minor version numbers
* of struct xpc_vars.
*/
struct xpc_vars {
struct xpc_vars_sn2 {
u8 version;
u64 heartbeat;
u64 heartbeating_to_mask;
DECLARE_BITMAP(heartbeating_to_mask, XP_MAX_NPARTITIONS_SN2);
u64 heartbeat_offline; /* if 0, heartbeat should be changing */
int act_nasid;
int act_phys_cpuid;
......@@ -176,43 +176,20 @@ struct xpc_vars {
#define XPC_SUPPORTS_DISENGAGE_REQUEST(_version) \
(_version >= _XPC_VERSION(3, 1))
static inline int
xpc_hb_allowed(short partid, struct xpc_vars *vars)
{
return ((vars->heartbeating_to_mask & (1UL << partid)) != 0);
}
static inline void
xpc_allow_hb(short partid, struct xpc_vars *vars)
{
u64 old_mask, new_mask;
do {
old_mask = vars->heartbeating_to_mask;
new_mask = (old_mask | (1UL << partid));
} while (cmpxchg(&vars->heartbeating_to_mask, old_mask, new_mask) !=
old_mask);
}
static inline void
xpc_disallow_hb(short partid, struct xpc_vars *vars)
{
u64 old_mask, new_mask;
do {
old_mask = vars->heartbeating_to_mask;
new_mask = (old_mask & ~(1UL << partid));
} while (cmpxchg(&vars->heartbeating_to_mask, old_mask, new_mask) !=
old_mask);
}
/*
* The AMOs page consists of a number of AMO variables which are divided into
* four groups, The first two groups are used to identify an IRQ's sender.
* These two groups consist of 64 and 128 AMO variables respectively. The last
* two groups, consisting of just one AMO variable each, are used to identify
* the remote partitions that are currently engaged (from the viewpoint of
* the XPC running on the remote partition).
* The following pertains to ia64-sn2 only.
*
* Memory for XPC's AMO variables is allocated by the MSPEC driver. These
* pages are located in the lowest granule. The lowest granule uses 4k pages
* for cached references and an alternate TLB handler to never provide a
* cacheable mapping for the entire region. This will prevent speculative
* reading of cached copies of our lines from being issued which will cause
* a PI FSB Protocol error to be generated by the SHUB. For XPC, we need 64
* AMO variables (based on XP_MAX_NPARTITIONS_SN2) to identify the senders of
* NOTIFY IRQs, 128 AMO variables (based on XP_NASID_MASK_WORDS) to identify
* the senders of ACTIVATE IRQs, and 2 AMO variables to identify which remote
* partitions (i.e., XPCs) consider themselves currently engaged with the
* local XPC.
*/
#define XPC_NOTIFY_IRQ_AMOS 0
#define XPC_ACTIVATE_IRQ_AMOS (XPC_NOTIFY_IRQ_AMOS + XP_MAX_NPARTITIONS_SN2)
......@@ -259,11 +236,11 @@ struct xpc_vars_part_sn2 {
/* the reserved page sizes and offsets */
#define XPC_RP_HEADER_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_rsvd_page))
#define XPC_RP_VARS_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_vars))
#define XPC_RP_VARS_SIZE L1_CACHE_ALIGN(sizeof(struct xpc_vars_sn2))
#define XPC_RP_PART_NASIDS(_rp) ((u64 *)((u8 *)(_rp) + XPC_RP_HEADER_SIZE))
#define XPC_RP_MACH_NASIDS(_rp) (XPC_RP_PART_NASIDS(_rp) + xp_nasid_mask_words)
#define XPC_RP_VARS(_rp) ((struct xpc_vars *)(XPC_RP_MACH_NASIDS(_rp) + \
#define XPC_RP_VARS(_rp) ((struct xpc_vars_sn2 *)(XPC_RP_MACH_NASIDS(_rp) + \
xp_nasid_mask_words))
/*
......@@ -344,6 +321,7 @@ struct xpc_notify {
* allocated at the time a partition becomes active. The array contains one
* of these structures for each potential channel connection to that partition.
*
>>> sn2 only!!!
* Each of these structures manages two message queues (circular buffers).
* They are allocated at the time a channel connection is made. One of
* these message queues (local_msgqueue) holds the locally created messages
......@@ -622,6 +600,9 @@ extern struct device *xpc_part;
extern struct device *xpc_chan;
extern int xpc_disengage_request_timelimit;
extern int xpc_disengage_request_timedout;
extern atomic_t xpc_act_IRQ_rcvd;
extern wait_queue_head_t xpc_act_IRQ_wq;
extern void *xpc_heartbeating_to_mask;
extern irqreturn_t xpc_notify_IRQ_handler(int, void *);
extern void xpc_dropped_IPI_check(struct xpc_partition *);
extern void xpc_activate_partition(struct xpc_partition *);
......@@ -629,15 +610,48 @@ 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 *);
extern void (*xpc_heartbeat_init) (void);
extern void (*xpc_heartbeat_exit) (void);
extern void (*xpc_increment_heartbeat) (void);
extern void (*xpc_offline_heartbeat) (void);
extern void (*xpc_online_heartbeat) (void);
extern void (*xpc_check_remote_hb) (void);
extern enum xp_retval (*xpc_make_first_contact) (struct xpc_partition *);
extern u64 (*xpc_get_IPI_flags) (struct xpc_partition *);
extern struct xpc_msg *(*xpc_get_deliverable_msg) (struct xpc_channel *);
extern void (*xpc_initiate_partition_activation) (struct xpc_rsvd_page *, u64,
int);
extern void (*xpc_process_act_IRQ_rcvd) (int);
extern enum xp_retval (*xpc_setup_infrastructure) (struct xpc_partition *);
extern void (*xpc_teardown_infrastructure) (struct xpc_partition *);
extern void (*xpc_mark_partition_engaged) (struct xpc_partition *);
extern void (*xpc_mark_partition_disengaged) (struct xpc_partition *);
extern void (*xpc_request_partition_disengage) (struct xpc_partition *);
extern void (*xpc_cancel_partition_disengage_request) (struct xpc_partition *);
extern u64 (*xpc_partition_engaged) (u64);
extern u64 (*xpc_partition_disengage_requested) (u64);;
extern void (*xpc_clear_partition_engaged) (u64);
extern void (*xpc_clear_partition_disengage_request) (u64);
extern void (*xpc_IPI_send_local_activate) (int);
extern void (*xpc_IPI_send_activated) (struct xpc_partition *);
extern void (*xpc_IPI_send_local_reactivate) (int);
extern void (*xpc_IPI_send_disengage) (struct xpc_partition *);
extern void (*xpc_IPI_send_closerequest) (struct xpc_channel *,
unsigned long *);
extern void (*xpc_IPI_send_closereply) (struct xpc_channel *, unsigned long *);
extern void (*xpc_IPI_send_openrequest) (struct xpc_channel *, unsigned long *);
extern void (*xpc_IPI_send_openreply) (struct xpc_channel *, unsigned long *);
extern enum xp_retval (*xpc_allocate_msg) (struct xpc_channel *, u32,
struct xpc_msg **);
extern enum xp_retval (*xpc_send_msg) (struct xpc_channel *, struct xpc_msg *,
u8, xpc_notify_func, void *);
extern void (*xpc_received_msg) (struct xpc_channel *, struct xpc_msg *);
/* found in xpc_sn2.c */
extern void xpc_init_sn2(void);
extern struct xpc_vars *xpc_vars; /*>>> eliminate from here */
/* found in xpc_uv.c */
extern void xpc_init_uv(void);
......@@ -646,6 +660,7 @@ extern void xpc_init_uv(void);
extern int xpc_exiting;
extern int xp_nasid_mask_words;
extern struct xpc_rsvd_page *xpc_rsvd_page;
extern u64 *xpc_mach_nasids;
extern struct xpc_partition *xpc_partitions;
extern char *xpc_remote_copy_buffer;
extern void *xpc_remote_copy_buffer_base;
......@@ -658,7 +673,8 @@ extern int xpc_partition_disengaged(struct xpc_partition *);
extern enum xp_retval xpc_mark_partition_active(struct xpc_partition *);
extern void xpc_mark_partition_inactive(struct xpc_partition *);
extern void xpc_discovery(void);
extern void xpc_check_remote_hb(void);
extern enum xp_retval xpc_get_remote_rp(int, u64 *, struct xpc_rsvd_page *,
u64 *);
extern void xpc_deactivate_partition(const int, struct xpc_partition *,
enum xp_retval);
extern enum xp_retval xpc_initiate_partid_to_nasids(short, void *);
......@@ -667,6 +683,7 @@ extern enum xp_retval xpc_initiate_partid_to_nasids(short, void *);
extern void *xpc_kzalloc_cacheline_aligned(size_t, gfp_t, void **);
extern void xpc_initiate_connect(int);
extern void xpc_initiate_disconnect(int);
extern enum xp_retval xpc_allocate_msg_wait(struct xpc_channel *);
extern enum xp_retval xpc_initiate_allocate(short, int, u32, void **);
extern enum xp_retval xpc_initiate_send(short, int, void *);
extern enum xp_retval xpc_initiate_send_notify(short, int, void *,
......@@ -680,6 +697,40 @@ extern void xpc_disconnect_channel(const int, struct xpc_channel *,
extern void xpc_disconnect_callout(struct xpc_channel *, enum xp_retval);
extern void xpc_partition_going_down(struct xpc_partition *, enum xp_retval);
static inline int
xpc_hb_allowed(short partid, void *heartbeating_to_mask)
{
return test_bit(partid, heartbeating_to_mask);
}
static inline int
xpc_any_hbs_allowed(void)
{
DBUG_ON(xpc_heartbeating_to_mask == NULL);
return !bitmap_empty(xpc_heartbeating_to_mask, xp_max_npartitions);
}
static inline void
xpc_allow_hb(short partid)
{
DBUG_ON(xpc_heartbeating_to_mask == NULL);
set_bit(partid, xpc_heartbeating_to_mask);
}
static inline void
xpc_disallow_hb(short partid)
{
DBUG_ON(xpc_heartbeating_to_mask == NULL);
clear_bit(partid, xpc_heartbeating_to_mask);
}
static inline void
xpc_disallow_all_hbs(void)
{
DBUG_ON(xpc_heartbeating_to_mask == NULL);
bitmap_zero(xpc_heartbeating_to_mask, xp_max_npartitions);
}
static inline void
xpc_wakeup_channel_mgr(struct xpc_partition *part)
{
......@@ -749,297 +800,7 @@ xpc_part_ref(struct xpc_partition *part)
}
/*
* This next set of inlines are used to keep track of when a partition is
* potentially engaged in accessing memory belonging to another partition.
*/
static inline void
xpc_mark_partition_engaged(struct xpc_partition *part)
{
unsigned long irq_flags;
AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa +
(XPC_ENGAGED_PARTITIONS_AMO *
sizeof(AMO_t)));
local_irq_save(irq_flags);
/* set bit corresponding to our partid in remote partition's AMO */
FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR,
(1UL << sn_partition_id));
/*
* We must always use the nofault function regardless of whether we
* are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
* didn't, we'd never know that the other partition is down and would
* keep sending IPIs and AMOs to it until the heartbeat times out.
*/
(void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->
variable),
xp_nofault_PIOR_target));
local_irq_restore(irq_flags);
}
static inline void
xpc_mark_partition_disengaged(struct xpc_partition *part)
{
unsigned long irq_flags;
AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa +
(XPC_ENGAGED_PARTITIONS_AMO *
sizeof(AMO_t)));
local_irq_save(irq_flags);
/* clear bit corresponding to our partid in remote partition's AMO */
FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND,
~(1UL << sn_partition_id));
/*
* We must always use the nofault function regardless of whether we
* are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
* didn't, we'd never know that the other partition is down and would
* keep sending IPIs and AMOs to it until the heartbeat times out.
*/
(void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->
variable),
xp_nofault_PIOR_target));
local_irq_restore(irq_flags);
}
static inline void
xpc_request_partition_disengage(struct xpc_partition *part)
{
unsigned long irq_flags;
AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa +
(XPC_DISENGAGE_REQUEST_AMO * sizeof(AMO_t)));
local_irq_save(irq_flags);
/* set bit corresponding to our partid in remote partition's AMO */
FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR,
(1UL << sn_partition_id));
/*
* We must always use the nofault function regardless of whether we
* are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
* didn't, we'd never know that the other partition is down and would
* keep sending IPIs and AMOs to it until the heartbeat times out.
*/
(void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->
variable),
xp_nofault_PIOR_target));
local_irq_restore(irq_flags);
}
static inline void
xpc_cancel_partition_disengage_request(struct xpc_partition *part)
{
unsigned long irq_flags;
AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa +
(XPC_DISENGAGE_REQUEST_AMO * sizeof(AMO_t)));
local_irq_save(irq_flags);
/* clear bit corresponding to our partid in remote partition's AMO */
FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND,
~(1UL << sn_partition_id));
/*
* We must always use the nofault function regardless of whether we
* are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
* didn't, we'd never know that the other partition is down and would
* keep sending IPIs and AMOs to it until the heartbeat times out.
*/
(void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->
variable),
xp_nofault_PIOR_target));
local_irq_restore(irq_flags);
}
static inline u64
xpc_partition_engaged(u64 partid_mask)
{
AMO_t *amo = xpc_vars->amos_page + XPC_ENGAGED_PARTITIONS_AMO;
/* return our partition's AMO variable ANDed with partid_mask */
return (FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_LOAD) &
partid_mask);
}
static inline u64
xpc_partition_disengage_requested(u64 partid_mask)
{
AMO_t *amo = xpc_vars->amos_page + XPC_DISENGAGE_REQUEST_AMO;
/* return our partition's AMO variable ANDed with partid_mask */
return (FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_LOAD) &
partid_mask);
}
static inline void
xpc_clear_partition_engaged(u64 partid_mask)
{
AMO_t *amo = xpc_vars->amos_page + XPC_ENGAGED_PARTITIONS_AMO;
/* clear bit(s) based on partid_mask in our partition's AMO */
FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND,
~partid_mask);
}
static inline void
xpc_clear_partition_disengage_request(u64 partid_mask)
{
AMO_t *amo = xpc_vars->amos_page + XPC_DISENGAGE_REQUEST_AMO;
/* clear bit(s) based on partid_mask in our partition's AMO */
FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND,
~partid_mask);
}
/*
* The following set of macros and inlines are used for the sending and
* receiving of IPIs (also known as IRQs). There are two flavors of IPIs,
* one that is associated with partition activity (SGI_XPC_ACTIVATE) and
* the other that is associated with channel activity (SGI_XPC_NOTIFY).
*/
static inline u64
xpc_IPI_receive(AMO_t *amo)
{
return FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_CLEAR);
}
static inline enum xp_retval
xpc_IPI_send(AMO_t *amo, u64 flag, int nasid, int phys_cpuid, int vector)
{
int ret = 0;
unsigned long irq_flags;
local_irq_save(irq_flags);
FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR, flag);
sn_send_IPI_phys(nasid, phys_cpuid, vector, 0);
/*
* We must always use the nofault function regardless of whether we
* are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
* didn't, we'd never know that the other partition is down and would
* keep sending IPIs and AMOs to it until the heartbeat times out.
*/
ret = xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->variable),
xp_nofault_PIOR_target));
local_irq_restore(irq_flags);
return ((ret == 0) ? xpSuccess : xpPioReadError);
}
/*
* IPIs associated with SGI_XPC_ACTIVATE IRQ.
*/
/*
* Flag the appropriate AMO variable and send an IPI to the specified node.
*/
static inline void
xpc_activate_IRQ_send(u64 amos_page_pa, int from_nasid, int to_nasid,
int to_phys_cpuid)
{
int w_index = XPC_NASID_W_INDEX(from_nasid);
int b_index = XPC_NASID_B_INDEX(from_nasid);
AMO_t *amos = (AMO_t *)__va(amos_page_pa +
(XPC_ACTIVATE_IRQ_AMOS * sizeof(AMO_t)));
(void)xpc_IPI_send(&amos[w_index], (1UL << b_index), to_nasid,
to_phys_cpuid, SGI_XPC_ACTIVATE);
}
static inline void
xpc_IPI_send_activate(struct xpc_vars *vars)
{
xpc_activate_IRQ_send(vars->amos_page_pa, cnodeid_to_nasid(0),
vars->act_nasid, vars->act_phys_cpuid);
}
static inline void
xpc_IPI_send_activated(struct xpc_partition *part)
{
xpc_activate_IRQ_send(part->remote_amos_page_pa, cnodeid_to_nasid(0),
part->remote_act_nasid,
part->remote_act_phys_cpuid);
}
static inline void
xpc_IPI_send_reactivate(struct xpc_partition *part)
{
xpc_activate_IRQ_send(xpc_vars->amos_page_pa, part->reactivate_nasid,
xpc_vars->act_nasid, xpc_vars->act_phys_cpuid);
}
static inline void
xpc_IPI_send_disengage(struct xpc_partition *part)
{
xpc_activate_IRQ_send(part->remote_amos_page_pa, cnodeid_to_nasid(0),
part->remote_act_nasid,
part->remote_act_phys_cpuid);
}
/*
* IPIs associated with SGI_XPC_NOTIFY IRQ.
*/
/*
* Send an IPI to the remote partition that is associated with the
* specified channel.
*/
#define XPC_NOTIFY_IRQ_SEND(_ch, _ipi_f, _irq_f) \
xpc_notify_IRQ_send(_ch, _ipi_f, #_ipi_f, _irq_f)
static inline void
xpc_notify_IRQ_send(struct xpc_channel *ch, u8 ipi_flag, char *ipi_flag_string,
unsigned long *irq_flags)
{
struct xpc_partition *part = &xpc_partitions[ch->partid];
enum xp_retval ret;
if (likely(part->act_state != XPC_P_DEACTIVATING)) {
ret = xpc_IPI_send(part->remote_IPI_amo_va,
(u64)ipi_flag << (ch->number * 8),
part->remote_IPI_nasid,
part->remote_IPI_phys_cpuid, SGI_XPC_NOTIFY);
dev_dbg(xpc_chan, "%s sent to partid=%d, channel=%d, ret=%d\n",
ipi_flag_string, ch->partid, ch->number, ret);
if (unlikely(ret != xpSuccess)) {
if (irq_flags != NULL)
spin_unlock_irqrestore(&ch->lock, *irq_flags);
XPC_DEACTIVATE_PARTITION(part, ret);
if (irq_flags != NULL)
spin_lock_irqsave(&ch->lock, *irq_flags);
}
}
}
/*
* Make it look like the remote partition, which is associated with the
* specified channel, sent us an IPI. This faked IPI will be handled
* by xpc_dropped_IPI_check().
*/
#define XPC_NOTIFY_IRQ_SEND_LOCAL(_ch, _ipi_f) \
xpc_notify_IRQ_send_local(_ch, _ipi_f, #_ipi_f)
static inline void
xpc_notify_IRQ_send_local(struct xpc_channel *ch, u8 ipi_flag,
char *ipi_flag_string)
{
struct xpc_partition *part = &xpc_partitions[ch->partid];
FETCHOP_STORE_OP(TO_AMO((u64)&part->local_IPI_amo_va->variable),
FETCHOP_OR, ((u64)ipi_flag << (ch->number * 8)));
dev_dbg(xpc_chan, "%s sent local from partid=%d, channel=%d\n",
ipi_flag_string, ch->partid, ch->number);
}
/*
* The sending and receiving of IPIs includes the setting of an AMO variable
* The sending and receiving of IPIs includes the setting of an >>>AMO variable
* to indicate the reason the IPI was sent. The 64-bit variable is divided
* up into eight bytes, ordered from right to left. Byte zero pertains to
* channel 0, byte one to channel 1, and so on. Each byte is described by
......@@ -1052,107 +813,11 @@ xpc_notify_IRQ_send_local(struct xpc_channel *ch, u8 ipi_flag,
#define XPC_IPI_OPENREPLY 0x08
#define XPC_IPI_MSGREQUEST 0x10
/* given an AMO variable and a channel#, get its associated IPI flags */
/* given an >>>AMO variable and a channel#, get its associated IPI flags */
#define XPC_GET_IPI_FLAGS(_amo, _c) ((u8) (((_amo) >> ((_c) * 8)) & 0xff))
#define XPC_SET_IPI_FLAGS(_amo, _c, _f) (_amo) |= ((u64) (_f) << ((_c) * 8))
#define XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(_amo) ((_amo) & 0x0f0f0f0f0f0f0f0fUL)
#define XPC_ANY_MSG_IPI_FLAGS_SET(_amo) ((_amo) & 0x1010101010101010UL)
static inline void
xpc_IPI_send_closerequest(struct xpc_channel *ch, unsigned long *irq_flags)
{
struct xpc_openclose_args *args = ch->local_openclose_args;
args->reason = ch->reason;
XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_CLOSEREQUEST, irq_flags);
}
static inline void
xpc_IPI_send_closereply(struct xpc_channel *ch, unsigned long *irq_flags)
{
XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_CLOSEREPLY, irq_flags);
}
static inline void
xpc_IPI_send_openrequest(struct xpc_channel *ch, unsigned long *irq_flags)
{
struct xpc_openclose_args *args = ch->local_openclose_args;
args->msg_size = ch->msg_size;
args->local_nentries = ch->local_nentries;
XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_OPENREQUEST, irq_flags);
}
static inline void
xpc_IPI_send_openreply(struct xpc_channel *ch, unsigned long *irq_flags)
{
struct xpc_openclose_args *args = ch->local_openclose_args;
args->remote_nentries = ch->remote_nentries;
args->local_nentries = ch->local_nentries;
args->local_msgqueue_pa = __pa(ch->local_msgqueue);
XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_OPENREPLY, irq_flags);
}
static inline void
xpc_IPI_send_msgrequest(struct xpc_channel *ch)
{
XPC_NOTIFY_IRQ_SEND(ch, XPC_IPI_MSGREQUEST, NULL);
}
static inline void
xpc_IPI_send_local_msgrequest(struct xpc_channel *ch)
{
XPC_NOTIFY_IRQ_SEND_LOCAL(ch, XPC_IPI_MSGREQUEST);
}
/*
>>> this block comment needs to be moved and re-written.
* Memory for XPC's AMO variables is allocated by the MSPEC driver. These
* pages are located in the lowest granule. The lowest granule uses 4k pages
* for cached references and an alternate TLB handler to never provide a
* cacheable mapping for the entire region. This will prevent speculative
* reading of cached copies of our lines from being issued which will cause
* a PI FSB Protocol error to be generated by the SHUB. For XPC, we need 64
* AMO variables (based on xp_max_npartitions) for message notification and an
* additional 128 AMO variables (based on XP_NASID_MASK_WORDS) for partition
* activation and 2 AMO variables for partition deactivation.
*/
static inline AMO_t *
xpc_IPI_init(int index)
{
AMO_t *amo = xpc_vars->amos_page + index;
(void)xpc_IPI_receive(amo); /* clear AMO variable */
return amo;
}
/*
* Check to see if there is any channel activity to/from the specified
* partition.
*/
static inline void
xpc_check_for_channel_activity(struct xpc_partition *part)
{
u64 IPI_amo;
unsigned long irq_flags;
IPI_amo = xpc_IPI_receive(part->local_IPI_amo_va);
if (IPI_amo == 0)
return;
spin_lock_irqsave(&part->IPI_lock, irq_flags);
part->local_IPI_amo |= IPI_amo;
spin_unlock_irqrestore(&part->IPI_lock, irq_flags);
dev_dbg(xpc_chan, "received IPI from partid=%d, IPI_amo=0x%lx\n",
XPC_PARTID(part), IPI_amo);
xpc_wakeup_channel_mgr(part);
}
#endif /* _DRIVERS_MISC_SGIXP_XPC_H */
drivers/misc/sgi-xp/xpc_channel.c
View file @ 33ba3c77
......@@ -1165,7 +1165,7 @@ xpc_disconnect_callout(struct xpc_channel *ch, enum xp_retval reason)
* Wait for a message entry to become available for the specified channel,
* but don't wait any longer than 1 jiffy.
*/
static enum xp_retval
enum xp_retval
xpc_allocate_msg_wait(struct xpc_channel *ch)
{
enum xp_retval ret;
......@@ -1191,96 +1191,6 @@ xpc_allocate_msg_wait(struct xpc_channel *ch)
return ret;
}
/*
* Allocate an entry for a message from the message queue associated with the
* specified channel.
*/
static enum xp_retval
xpc_allocate_msg(struct xpc_channel *ch, u32 flags,
struct xpc_msg **address_of_msg)
{
struct xpc_msg *msg;
enum xp_retval ret;
s64 put;
/* this reference will be dropped in xpc_send_msg() */
xpc_msgqueue_ref(ch);
if (ch->flags & XPC_C_DISCONNECTING) {
xpc_msgqueue_deref(ch);
return ch->reason;
}
if (!(ch->flags & XPC_C_CONNECTED)) {
xpc_msgqueue_deref(ch);
return xpNotConnected;
}
/*
* Get the next available message entry from the local message queue.
* If none are available, we'll make sure that we grab the latest
* GP values.
*/
ret = xpTimeout;
while (1) {
put = ch->w_local_GP.put;
rmb(); /* guarantee that .put loads before .get */
if (put - ch->w_remote_GP.get < ch->local_nentries) {
/* There are available message entries. We need to try
* to secure one for ourselves. We'll do this by trying
* to increment w_local_GP.put as long as someone else
* doesn't beat us to it. If they do, we'll have to
* try again.
*/
if (cmpxchg(&ch->w_local_GP.put, put, put + 1) == put) {
/* we got the entry referenced by put */
break;
}
continue; /* try again */
}
/*
* There aren't any available msg entries at this time.
*
* In waiting for a message entry to become available,
* we set a timeout in case the other side is not
* sending completion IPIs. This lets us fake an IPI
* that will cause the IPI handler to fetch the latest
* GP values as if an IPI was sent by the other side.
*/
if (ret == xpTimeout)
xpc_IPI_send_local_msgrequest(ch);
if (flags & XPC_NOWAIT) {
xpc_msgqueue_deref(ch);
return xpNoWait;
}
ret = xpc_allocate_msg_wait(ch);
if (ret != xpInterrupted && ret != xpTimeout) {
xpc_msgqueue_deref(ch);
return ret;
}
}
/* get the message's address and initialize it */
msg = (struct xpc_msg *)((u64)ch->local_msgqueue +
(put % ch->local_nentries) * ch->msg_size);
DBUG_ON(msg->flags != 0);
msg->number = put;
dev_dbg(xpc_chan, "w_local_GP.put changed to %ld; msg=0x%p, "
"msg_number=%ld, partid=%d, channel=%d\n", put + 1,
(void *)msg, msg->number, ch->partid, ch->number);
*address_of_msg = msg;
return xpSuccess;
}
/*
* Allocate an entry for a message from the message queue associated with the
* specified channel. NOTE that this routine can sleep waiting for a message
......@@ -1317,144 +1227,6 @@ xpc_initiate_allocate(short partid, int ch_number, u32 flags, void **payload)
return ret;
}
/*
* Now we actually send the messages that are ready to be sent by advancing
* the local message queue's Put value and then send an IPI to the recipient
* partition.
*/
static void
xpc_send_msgs(struct xpc_channel *ch, s64 initial_put)
{
struct xpc_msg *msg;
s64 put = initial_put + 1;
int send_IPI = 0;
while (1) {
while (1) {
if (put == ch->w_local_GP.put)
break;
msg = (struct xpc_msg *)((u64)ch->local_msgqueue +
(put % ch->local_nentries) *
ch->msg_size);
if (!(msg->flags & XPC_M_READY))
break;
put++;
}
if (put == initial_put) {
/* nothing's changed */
break;
}
if (cmpxchg_rel(&ch->local_GP->put, initial_put, put) !=
initial_put) {
/* someone else beat us to it */
DBUG_ON(ch->local_GP->put < initial_put);
break;
}
/* we just set the new value of local_GP->put */
dev_dbg(xpc_chan, "local_GP->put changed to %ld, partid=%d, "
"channel=%d\n", put, ch->partid, ch->number);
send_IPI = 1;
/*
* We need to ensure that the message referenced by
* local_GP->put is not XPC_M_READY or that local_GP->put
* equals w_local_GP.put, so we'll go have a look.
*/
initial_put = put;
}
if (send_IPI)
xpc_IPI_send_msgrequest(ch);
}
/*
* Common code that does the actual sending of the message by advancing the
* local message queue's Put value and sends an IPI to the partition the
* message is being sent to.
*/
static enum xp_retval
xpc_send_msg(struct xpc_channel *ch, struct xpc_msg *msg, u8 notify_type,
xpc_notify_func func, void *key)
{
enum xp_retval ret = xpSuccess;
struct xpc_notify *notify = notify;
s64 put, msg_number = msg->number;
DBUG_ON(notify_type == XPC_N_CALL && func == NULL);
DBUG_ON((((u64)msg - (u64)ch->local_msgqueue) / ch->msg_size) !=
msg_number % ch->local_nentries);
DBUG_ON(msg->flags & XPC_M_READY);
if (ch->flags & XPC_C_DISCONNECTING) {
/* drop the reference grabbed in xpc_allocate_msg() */
xpc_msgqueue_deref(ch);
return ch->reason;
}
if (notify_type != 0) {
/*
* Tell the remote side to send an ACK interrupt when the
* message has been delivered.
*/
msg->flags |= XPC_M_INTERRUPT;
atomic_inc(&ch->n_to_notify);
notify = &ch->notify_queue[msg_number % ch->local_nentries];
notify->func = func;
notify->key = key;
notify->type = notify_type;
/* >>> is a mb() needed here? */
if (ch->flags & XPC_C_DISCONNECTING) {
/*
* An error occurred between our last error check and
* this one. We will try to clear the type field from
* the notify entry. If we succeed then
* xpc_disconnect_channel() didn't already process
* the notify entry.
*/
if (cmpxchg(&notify->type, notify_type, 0) ==
notify_type) {
atomic_dec(&ch->n_to_notify);
ret = ch->reason;
}
/* drop the reference grabbed in xpc_allocate_msg() */
xpc_msgqueue_deref(ch);
return ret;
}
}
msg->flags |= XPC_M_READY;
/*
* The preceding store of msg->flags must occur before the following
* load of ch->local_GP->put.
*/
mb();
/* see if the message is next in line to be sent, if so send it */
put = ch->local_GP->put;
if (put == msg_number)
xpc_send_msgs(ch, put);
/* drop the reference grabbed in xpc_allocate_msg() */
xpc_msgqueue_deref(ch);
return ret;
}
/*
* Send a message previously allocated using xpc_initiate_allocate() on the
* specified channel connected to the specified partition.
......@@ -1585,66 +1357,6 @@ xpc_deliver_msg(struct xpc_channel *ch)
}
}
/*
* Now we actually acknowledge the messages that have been delivered and ack'd
* by advancing the cached remote message queue's Get value and if requested
* send an IPI to the message sender's partition.
*/
static void
xpc_acknowledge_msgs(struct xpc_channel *ch, s64 initial_get, u8 msg_flags)
{
struct xpc_msg *msg;
s64 get = initial_get + 1;
int send_IPI = 0;
while (1) {
while (1) {
if (get == ch->w_local_GP.get)
break;
msg = (struct xpc_msg *)((u64)ch->remote_msgqueue +
(get % ch->remote_nentries) *
ch->msg_size);
if (!(msg->flags & XPC_M_DONE))
break;
msg_flags |= msg->flags;
get++;
}
if (get == initial_get) {
/* nothing's changed */
break;
}
if (cmpxchg_rel(&ch->local_GP->get, initial_get, get) !=
initial_get) {
/* someone else beat us to it */
DBUG_ON(ch->local_GP->get <= initial_get);
break;
}
/* we just set the new value of local_GP->get */
dev_dbg(xpc_chan, "local_GP->get changed to %ld, partid=%d, "
"channel=%d\n", get, ch->partid, ch->number);
send_IPI = (msg_flags & XPC_M_INTERRUPT);
/*
* We need to ensure that the message referenced by
* local_GP->get is not XPC_M_DONE or that local_GP->get
* equals w_local_GP.get, so we'll go have a look.
*/
initial_get = get;
}
if (send_IPI)
xpc_IPI_send_msgrequest(ch);
}
/*
* Acknowledge receipt of a delivered message.
*
......@@ -1668,35 +1380,12 @@ xpc_initiate_received(short partid, int ch_number, void *payload)
struct xpc_partition *part = &xpc_partitions[partid];
struct xpc_channel *ch;
struct xpc_msg *msg = XPC_MSG_ADDRESS(payload);
s64 get, msg_number = msg->number;
DBUG_ON(partid < 0 || partid >= xp_max_npartitions);
DBUG_ON(ch_number < 0 || ch_number >= part->nchannels);
ch = &part->channels[ch_number];
dev_dbg(xpc_chan, "msg=0x%p, msg_number=%ld, partid=%d, channel=%d\n",
(void *)msg, msg_number, ch->partid, ch->number);
DBUG_ON((((u64)msg - (u64)ch->remote_msgqueue) / ch->msg_size) !=
msg_number % ch->remote_nentries);
DBUG_ON(msg->flags & XPC_M_DONE);
msg->flags |= XPC_M_DONE;
/*
* The preceding store of msg->flags must occur before the following
* load of ch->local_GP->get.
*/
mb();
/*
* See if this message is next in line to be acknowledged as having
* been delivered.
*/
get = ch->local_GP->get;
if (get == msg_number)
xpc_acknowledge_msgs(ch, get, msg->flags);
xpc_received_msg(ch, msg);
/* the call to xpc_msgqueue_ref() was done by xpc_deliver_msg() */
xpc_msgqueue_deref(ch);
......
drivers/misc/sgi-xp/xpc_main.c
View file @ 33ba3c77
......@@ -148,12 +148,14 @@ static struct ctl_table_header *xpc_sysctl;
int xpc_disengage_request_timedout;
/* #of IRQs received */
static atomic_t xpc_act_IRQ_rcvd;
atomic_t xpc_act_IRQ_rcvd;
/* IRQ handler notifies this wait queue on receipt of an IRQ */
static DECLARE_WAIT_QUEUE_HEAD(xpc_act_IRQ_wq);
DECLARE_WAIT_QUEUE_HEAD(xpc_act_IRQ_wq);
static unsigned long xpc_hb_check_timeout;
static struct timer_list xpc_hb_timer;
void *xpc_heartbeating_to_mask;
/* notification that the xpc_hb_checker thread has exited */
static DECLARE_COMPLETION(xpc_hb_checker_exited);
......@@ -161,8 +163,6 @@ static DECLARE_COMPLETION(xpc_hb_checker_exited);
/* notification that the xpc_discovery thread has exited */
static DECLARE_COMPLETION(xpc_discovery_exited);
static struct timer_list xpc_hb_timer;
static void xpc_kthread_waitmsgs(struct xpc_partition *, struct xpc_channel *);
static int xpc_system_reboot(struct notifier_block *, unsigned long, void *);
......@@ -176,12 +176,54 @@ static struct notifier_block xpc_die_notifier = {
};
enum xp_retval (*xpc_rsvd_page_init) (struct xpc_rsvd_page *rp);
void (*xpc_heartbeat_init) (void);
void (*xpc_heartbeat_exit) (void);
void (*xpc_increment_heartbeat) (void);
void (*xpc_offline_heartbeat) (void);
void (*xpc_online_heartbeat) (void);
void (*xpc_check_remote_hb) (void);
enum xp_retval (*xpc_make_first_contact) (struct xpc_partition *part);
u64 (*xpc_get_IPI_flags) (struct xpc_partition *part);
struct xpc_msg *(*xpc_get_deliverable_msg) (struct xpc_channel *ch);
void (*xpc_initiate_partition_activation) (struct xpc_rsvd_page *remote_rp,
u64 remote_rp_pa, int nasid);
void (*xpc_process_act_IRQ_rcvd) (int n_IRQs_expected);
enum xp_retval (*xpc_setup_infrastructure) (struct xpc_partition *part);
void (*xpc_teardown_infrastructure) (struct xpc_partition *part);
void (*xpc_mark_partition_engaged) (struct xpc_partition *part);
void (*xpc_mark_partition_disengaged) (struct xpc_partition *part);
void (*xpc_request_partition_disengage) (struct xpc_partition *part);
void (*xpc_cancel_partition_disengage_request) (struct xpc_partition *part);
u64 (*xpc_partition_engaged) (u64 partid_mask);
u64 (*xpc_partition_disengage_requested) (u64 partid_mask);
void (*xpc_clear_partition_engaged) (u64 partid_mask);
void (*xpc_clear_partition_disengage_request) (u64 partid_mask);
void (*xpc_IPI_send_local_activate) (int from_nasid);
void (*xpc_IPI_send_activated) (struct xpc_partition *part);
void (*xpc_IPI_send_local_reactivate) (int from_nasid);
void (*xpc_IPI_send_disengage) (struct xpc_partition *part);
void (*xpc_IPI_send_closerequest) (struct xpc_channel *ch,
unsigned long *irq_flags);
void (*xpc_IPI_send_closereply) (struct xpc_channel *ch,
unsigned long *irq_flags);
void (*xpc_IPI_send_openrequest) (struct xpc_channel *ch,
unsigned long *irq_flags);
void (*xpc_IPI_send_openreply) (struct xpc_channel *ch,
unsigned long *irq_flags);
enum xp_retval (*xpc_allocate_msg) (struct xpc_channel *ch, u32 flags,
struct xpc_msg **address_of_msg);
enum xp_retval (*xpc_send_msg) (struct xpc_channel *ch, struct xpc_msg *msg,
u8 notify_type, xpc_notify_func func,
void *key);
void (*xpc_received_msg) (struct xpc_channel *ch, struct xpc_msg *msg);
/*
* Timer function to enforce the timelimit on the partition disengage request.
......@@ -218,7 +260,7 @@ xpc_act_IRQ_handler(int irq, void *dev_id)
static void
xpc_hb_beater(unsigned long dummy)
{
xpc_vars->heartbeat++;
xpc_increment_heartbeat();
if (time_after_eq(jiffies, xpc_hb_check_timeout))
wake_up_interruptible(&xpc_act_IRQ_wq);
......@@ -227,6 +269,22 @@ xpc_hb_beater(unsigned long dummy)
add_timer(&xpc_hb_timer);
}
static void
xpc_start_hb_beater(void)
{
xpc_heartbeat_init();
init_timer(&xpc_hb_timer);
xpc_hb_timer.function = xpc_hb_beater;
xpc_hb_beater(0);
}
static void
xpc_stop_hb_beater(void)
{
del_timer_sync(&xpc_hb_timer);
xpc_heartbeat_exit();
}
/*
* This thread is responsible for nearly all of the partition
* activation/deactivation.
......@@ -244,7 +302,7 @@ xpc_hb_checker(void *ignore)
/* set our heartbeating to other partitions into motion */
xpc_hb_check_timeout = jiffies + (xpc_hb_check_interval * HZ);
xpc_hb_beater(0);
xpc_start_hb_beater();
while (!xpc_exiting) {
......@@ -274,11 +332,8 @@ xpc_hb_checker(void *ignore)
dev_dbg(xpc_part, "found an IRQ to process; will be "
"resetting xpc_hb_check_timeout\n");
last_IRQ_count += xpc_identify_act_IRQ_sender();
if (last_IRQ_count < new_IRQ_count) {
/* retry once to help avoid missing AMO */
(void)xpc_identify_act_IRQ_sender();
}
xpc_process_act_IRQ_rcvd(new_IRQ_count -
last_IRQ_count);
last_IRQ_count = new_IRQ_count;
xpc_hb_check_timeout = jiffies +
......@@ -294,6 +349,8 @@ xpc_hb_checker(void *ignore)
xpc_exiting));
}
xpc_stop_hb_beater();
dev_dbg(xpc_part, "heartbeat checker is exiting\n");
/* mark this thread as having exited */
......@@ -401,31 +458,7 @@ xpc_activating(void *__partid)
dev_dbg(xpc_part, "activating partition %d\n", partid);
/*
* 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 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_amos_page_pa after module
* reloads and system reboots.
*/
if (sn_register_xp_addr_region(part->remote_amos_page_pa,
PAGE_SIZE, 1) < 0) {
dev_warn(xpc_part, "xpc_activating(%d) failed to register "
"xp_addr region\n", partid);
spin_lock_irqsave(&part->act_lock, irq_flags);
part->act_state = XPC_P_INACTIVE;
XPC_SET_REASON(part, xpPhysAddrRegFailed, __LINE__);
spin_unlock_irqrestore(&part->act_lock, irq_flags);
part->remote_rp_pa = 0;
return 0;
}
xpc_allow_hb(partid, xpc_vars);
xpc_IPI_send_activated(part);
xpc_allow_hb(partid);
if (xpc_setup_infrastructure(part) == xpSuccess) {
(void)xpc_part_ref(part); /* this will always succeed */
......@@ -440,12 +473,12 @@ xpc_activating(void *__partid)
xpc_teardown_infrastructure(part);
}
xpc_disallow_hb(partid, xpc_vars);
xpc_disallow_hb(partid);
xpc_mark_partition_inactive(part);
if (part->reason == xpReactivating) {
/* interrupting ourselves results in activating partition */
xpc_IPI_send_reactivate(part);
xpc_IPI_send_local_reactivate(part->reactivate_nasid);
}
return 0;
......@@ -477,6 +510,32 @@ xpc_activate_partition(struct xpc_partition *part)
}
}
/*
* Check to see if there is any channel activity to/from the specified
* partition.
*/
static void
xpc_check_for_channel_activity(struct xpc_partition *part)
{
u64 IPI_amo;
unsigned long irq_flags;
/* this needs to be uncommented, but I'm thinking this function and the */
/* ones that call it need to be moved into xpc_sn2.c... */
IPI_amo = 0; /* = xpc_IPI_receive(part->local_IPI_amo_va); */
if (IPI_amo == 0)
return;
spin_lock_irqsave(&part->IPI_lock, irq_flags);
part->local_IPI_amo |= IPI_amo;
spin_unlock_irqrestore(&part->IPI_lock, irq_flags);
dev_dbg(xpc_chan, "received IPI from partid=%d, IPI_amo=0x%lx\n",
XPC_PARTID(part), IPI_amo);
xpc_wakeup_channel_mgr(part);
}
/*
* Handle the receipt of a SGI_XPC_NOTIFY IRQ by seeing whether the specified
* partition actually sent it. Since SGI_XPC_NOTIFY IRQs may be shared by more
......@@ -902,14 +961,11 @@ xpc_do_exit(enum xp_retval reason)
} while (1);
DBUG_ON(xpc_partition_engaged(-1UL));
DBUG_ON(xpc_any_hbs_allowed() != 0);
/* indicate to others that our reserved page is uninitialized */
xpc_rsvd_page->stamp = ZERO_STAMP;
/* now it's time to eliminate our heartbeat */
del_timer_sync(&xpc_hb_timer);
DBUG_ON(xpc_vars->heartbeating_to_mask != 0);
if (reason == xpUnloading) {
(void)unregister_die_notifier(&xpc_die_notifier);
(void)unregister_reboot_notifier(&xpc_reboot_notifier);
......@@ -968,7 +1024,7 @@ xpc_die_disengage(void)
/* keep xpc_hb_checker thread from doing anything (just in case) */
xpc_exiting = 1;
xpc_vars->heartbeating_to_mask = 0; /* indicate we're deactivated */
xpc_disallow_all_hbs(); /*indicate we're deactivated */
for (partid = 0; partid < xp_max_npartitions; partid++) {
part = &xpc_partitions[partid];
......@@ -1054,8 +1110,7 @@ xpc_system_die(struct notifier_block *nb, unsigned long event, void *unused)
/* fall through */
case DIE_MCA_MONARCH_ENTER:
case DIE_INIT_MONARCH_ENTER:
xpc_vars->heartbeat++;
xpc_vars->heartbeat_offline = 1;
xpc_offline_heartbeat();
break;
case DIE_KDEBUG_LEAVE:
......@@ -1066,8 +1121,7 @@ xpc_system_die(struct notifier_block *nb, unsigned long event, void *unused)
/* fall through */
case DIE_MCA_MONARCH_LEAVE:
case DIE_INIT_MONARCH_LEAVE:
xpc_vars->heartbeat++;
xpc_vars->heartbeat_offline = 0;
xpc_online_heartbeat();
break;
}
......@@ -1202,9 +1256,6 @@ xpc_init(void)
if (ret != 0)
dev_warn(xpc_part, "can't register die notifier\n");
init_timer(&xpc_hb_timer);
xpc_hb_timer.function = xpc_hb_beater;
/*
* The real work-horse behind xpc. This processes incoming
* interrupts and monitors remote heartbeats.
......@@ -1246,7 +1297,6 @@ xpc_init(void)
/* indicate to others that our reserved page is uninitialized */
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);
out_3:
......
drivers/misc/sgi-xp/xpc_partition.c
View file @ 33ba3c77
......@@ -42,7 +42,7 @@ 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;
u64 *xpc_mach_nasids;
/* >>> next two variables should be 'xpc_' if they remain here */
static int xp_sizeof_nasid_mask; /* actual size in bytes of nasid mask */
......@@ -317,62 +317,6 @@ xpc_restrict_IPI_ops(void)
}
}
/*
* 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;
short partid;
enum xp_retval ret;
remote_vars = (struct xpc_vars *)xpc_remote_copy_buffer;
for (partid = 0; partid < xp_max_npartitions; 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 */
ret = xp_remote_memcpy(remote_vars,
(void *)part->remote_vars_pa,
XPC_RP_VARS_SIZE);
if (ret != xpSuccess) {
XPC_DEACTIVATE_PARTITION(part, ret);
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, xpNoHeartbeat);
continue;
}
part->last_heartbeat = remote_vars->heartbeat;
}
}
/*
* Get a copy of a portion of the remote partition's rsvd page.
*
......@@ -380,7 +324,7 @@ xpc_check_remote_hb(void)
* is large enough to contain a copy of their reserved page header and
* part_nasids mask.
*/
static enum xp_retval
enum xp_retval
xpc_get_remote_rp(int nasid, u64 *discovered_nasids,
struct xpc_rsvd_page *remote_rp, u64 *remote_rp_pa)
{
......@@ -431,322 +375,6 @@ xpc_get_remote_rp(int nasid, u64 *discovered_nasids,
return xpSuccess;
}
/*
* 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 xp_retval
xpc_get_remote_vars(u64 remote_vars_pa, struct xpc_vars *remote_vars)
{
enum xp_retval ret;
if (remote_vars_pa == 0)
return xpVarsNotSet;
/* pull over the cross partition variables */
ret = xp_remote_memcpy(remote_vars, (void *)remote_vars_pa,
XPC_RP_VARS_SIZE);
if (ret != xpSuccess)
return ret;
if (XPC_VERSION_MAJOR(remote_vars->version) !=
XPC_VERSION_MAJOR(XPC_V_VERSION)) {
return xpBadVersion;
}
return xpSuccess;
}
/*
* 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);
/* >>> remote_vars_part_pa and vars_part_pa are sn2 only!!! */
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 }; /*>>> ZERO_STAMP */
short partid;
struct xpc_partition *part;
enum xp_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 != xpSuccess) {
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->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->SAL_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 != xpSuccess) {
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, xpReactivating);
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, xpReactivating);
} else if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version) &&
xpc_partition_disengage_requested(1UL << partid)) {
XPC_DEACTIVATE_PARTITION(part, xpOtherGoingDown);
}
}
/*
* 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.
......@@ -836,7 +464,7 @@ xpc_deactivate_partition(const int line, struct xpc_partition *part,
spin_unlock_irqrestore(&part->act_lock, irq_flags);
if (reason == xpReactivating) {
/* we interrupt ourselves to reactivate partition */
xpc_IPI_send_reactivate(part);
xpc_IPI_send_local_reactivate(part->reactivate_nasid);
}
return;
}
......@@ -903,16 +531,12 @@ 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;
short partid;
struct xpc_partition *part;
u64 *discovered_nasids;
enum xp_retval ret;
......@@ -922,8 +546,6 @@ xpc_discovery(void)
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) {
......@@ -988,7 +610,7 @@ xpc_discovery(void)
continue;
}
/* pull over the reserved page structure */
/* pull over the rsvd page header & part_nasids mask */
ret = xpc_get_remote_rp(nasid, discovered_nasids,
remote_rp, &remote_rp_pa);
......@@ -1003,72 +625,8 @@ xpc_discovery(void)
continue;
}
remote_vars_pa = remote_rp->sn.vars_pa;
partid = remote_rp->SAL_partid;
part = &xpc_partitions[partid];
/* pull over the cross partition variables */
ret = xpc_get_remote_vars(remote_vars_pa, remote_vars);
if (ret != xpSuccess) {
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, xpPhysAddrRegFailed,
__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);
xpc_initiate_partition_activation(remote_rp,
remote_rp_pa, nasid);
}
}
......
drivers/misc/sgi-xp/xpc_sn2.c
View file @ 33ba3c77
......@@ -19,9 +19,370 @@
#include <asm/sn/sn_sal.h>
#include "xpc.h"
struct xpc_vars *xpc_vars;
static struct xpc_vars_sn2 *xpc_vars; /* >>> Add _sn2 suffix? */
static struct xpc_vars_part_sn2 *xpc_vars_part; /* >>> Add _sn2 suffix? */
/*
* The following set of macros and functions are used for the sending and
* receiving of IPIs (also known as IRQs). There are two flavors of IPIs,
* one that is associated with partition activity (SGI_XPC_ACTIVATE) and
* the other that is associated with channel activity (SGI_XPC_NOTIFY).
*/
static u64
xpc_IPI_receive_sn2(AMO_t *amo)
{
return FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_CLEAR);
}
static enum xp_retval
xpc_IPI_send_sn2(AMO_t *amo, u64 flag, int nasid, int phys_cpuid, int vector)
{
int ret = 0;
unsigned long irq_flags;
local_irq_save(irq_flags);
FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR, flag);
sn_send_IPI_phys(nasid, phys_cpuid, vector, 0);
/*
* We must always use the nofault function regardless of whether we
* are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
* didn't, we'd never know that the other partition is down and would
* keep sending IPIs and AMOs to it until the heartbeat times out.
*/
ret = xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->variable),
xp_nofault_PIOR_target));
local_irq_restore(irq_flags);
return ((ret == 0) ? xpSuccess : xpPioReadError);
}
static AMO_t *
xpc_IPI_init_sn2(int index)
{
AMO_t *amo = xpc_vars->amos_page + index;
(void)xpc_IPI_receive_sn2(amo); /* clear AMO variable */
return amo;
}
/*
* IPIs associated with SGI_XPC_ACTIVATE IRQ.
*/
/*
* Flag the appropriate AMO variable and send an IPI to the specified node.
*/
static void
xpc_activate_IRQ_send_sn2(u64 amos_page_pa, int from_nasid, int to_nasid,
int to_phys_cpuid)
{
int w_index = XPC_NASID_W_INDEX(from_nasid);
int b_index = XPC_NASID_B_INDEX(from_nasid);
AMO_t *amos = (AMO_t *)__va(amos_page_pa +
(XPC_ACTIVATE_IRQ_AMOS * sizeof(AMO_t)));
(void)xpc_IPI_send_sn2(&amos[w_index], (1UL << b_index), to_nasid,
to_phys_cpuid, SGI_XPC_ACTIVATE);
}
static void
xpc_activate_IRQ_send_local_sn2(int from_nasid)
{
int w_index = XPC_NASID_W_INDEX(from_nasid);
int b_index = XPC_NASID_B_INDEX(from_nasid);
AMO_t *amos = (AMO_t *)__va(xpc_vars->amos_page_pa +
(XPC_ACTIVATE_IRQ_AMOS * sizeof(AMO_t)));
/* fake the sending and receipt of an activate IRQ from remote nasid */
FETCHOP_STORE_OP(TO_AMO((u64)&amos[w_index].variable), FETCHOP_OR,
(1UL << b_index));
atomic_inc(&xpc_act_IRQ_rcvd);
wake_up_interruptible(&xpc_act_IRQ_wq);
}
static void
xpc_IPI_send_local_activate_sn2(int from_nasid)
{
xpc_activate_IRQ_send_local_sn2(from_nasid);
}
static void
xpc_IPI_send_activated_sn2(struct xpc_partition *part)
{
xpc_activate_IRQ_send_sn2(part->remote_amos_page_pa,
cnodeid_to_nasid(0), part->remote_act_nasid,
part->remote_act_phys_cpuid);
}
static void
xpc_IPI_send_local_reactivate_sn2(int from_nasid)
{
xpc_activate_IRQ_send_local_sn2(from_nasid);
}
static void
xpc_IPI_send_disengage_sn2(struct xpc_partition *part)
{
xpc_activate_IRQ_send_sn2(part->remote_amos_page_pa,
cnodeid_to_nasid(0), part->remote_act_nasid,
part->remote_act_phys_cpuid);
}
/*
* IPIs associated with SGI_XPC_NOTIFY IRQ.
*/
/*
* Send an IPI to the remote partition that is associated with the
* specified channel.
*/
static void
xpc_notify_IRQ_send_sn2(struct xpc_channel *ch, u8 ipi_flag,
char *ipi_flag_string, unsigned long *irq_flags)
{
struct xpc_partition *part = &xpc_partitions[ch->partid];
enum xp_retval ret;
if (likely(part->act_state != XPC_P_DEACTIVATING)) {
ret = xpc_IPI_send_sn2(part->remote_IPI_amo_va,
(u64)ipi_flag << (ch->number * 8),
part->remote_IPI_nasid,
part->remote_IPI_phys_cpuid,
SGI_XPC_NOTIFY);
dev_dbg(xpc_chan, "%s sent to partid=%d, channel=%d, ret=%d\n",
ipi_flag_string, ch->partid, ch->number, ret);
if (unlikely(ret != xpSuccess)) {
if (irq_flags != NULL)
spin_unlock_irqrestore(&ch->lock, *irq_flags);
XPC_DEACTIVATE_PARTITION(part, ret);
if (irq_flags != NULL)
spin_lock_irqsave(&ch->lock, *irq_flags);
}
}
}
#define XPC_NOTIFY_IRQ_SEND_SN2(_ch, _ipi_f, _irq_f) \
xpc_notify_IRQ_send_sn2(_ch, _ipi_f, #_ipi_f, _irq_f)
/*
* Make it look like the remote partition, which is associated with the
* specified channel, sent us an IPI. This faked IPI will be handled
* by xpc_dropped_IPI_check().
*/
static void
xpc_notify_IRQ_send_local_sn2(struct xpc_channel *ch, u8 ipi_flag,
char *ipi_flag_string)
{
struct xpc_partition *part = &xpc_partitions[ch->partid];
FETCHOP_STORE_OP(TO_AMO((u64)&part->local_IPI_amo_va->variable),
FETCHOP_OR, ((u64)ipi_flag << (ch->number * 8)));
dev_dbg(xpc_chan, "%s sent local from partid=%d, channel=%d\n",
ipi_flag_string, ch->partid, ch->number);
}
#define XPC_NOTIFY_IRQ_SEND_LOCAL_SN2(_ch, _ipi_f) \
xpc_notify_IRQ_send_local_sn2(_ch, _ipi_f, #_ipi_f)
static void
xpc_IPI_send_closerequest_sn2(struct xpc_channel *ch, unsigned long *irq_flags)
{
struct xpc_openclose_args *args = ch->local_openclose_args;
args->reason = ch->reason;
XPC_NOTIFY_IRQ_SEND_SN2(ch, XPC_IPI_CLOSEREQUEST, irq_flags);
}
static void
xpc_IPI_send_closereply_sn2(struct xpc_channel *ch, unsigned long *irq_flags)
{
XPC_NOTIFY_IRQ_SEND_SN2(ch, XPC_IPI_CLOSEREPLY, irq_flags);
}
static void
xpc_IPI_send_openrequest_sn2(struct xpc_channel *ch, unsigned long *irq_flags)
{
struct xpc_openclose_args *args = ch->local_openclose_args;
args->msg_size = ch->msg_size;
args->local_nentries = ch->local_nentries;
XPC_NOTIFY_IRQ_SEND_SN2(ch, XPC_IPI_OPENREQUEST, irq_flags);
}
static void
xpc_IPI_send_openreply_sn2(struct xpc_channel *ch, unsigned long *irq_flags)
{
struct xpc_openclose_args *args = ch->local_openclose_args;
args->remote_nentries = ch->remote_nentries;
args->local_nentries = ch->local_nentries;
args->local_msgqueue_pa = __pa(ch->local_msgqueue);
XPC_NOTIFY_IRQ_SEND_SN2(ch, XPC_IPI_OPENREPLY, irq_flags);
}
static void
xpc_IPI_send_msgrequest_sn2(struct xpc_channel *ch)
{
XPC_NOTIFY_IRQ_SEND_SN2(ch, XPC_IPI_MSGREQUEST, NULL);
}
static void
xpc_IPI_send_local_msgrequest_sn2(struct xpc_channel *ch)
{
XPC_NOTIFY_IRQ_SEND_LOCAL_SN2(ch, XPC_IPI_MSGREQUEST);
}
/*
* This next set of functions are used to keep track of when a partition is
* potentially engaged in accessing memory belonging to another partition.
*/
static void
xpc_mark_partition_engaged_sn2(struct xpc_partition *part)
{
unsigned long irq_flags;
AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa +
(XPC_ENGAGED_PARTITIONS_AMO *
sizeof(AMO_t)));
local_irq_save(irq_flags);
/* set bit corresponding to our partid in remote partition's AMO */
FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR,
(1UL << sn_partition_id));
/*
* We must always use the nofault function regardless of whether we
* are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
* didn't, we'd never know that the other partition is down and would
* keep sending IPIs and AMOs to it until the heartbeat times out.
*/
(void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->
variable),
xp_nofault_PIOR_target));
local_irq_restore(irq_flags);
}
static void
xpc_mark_partition_disengaged_sn2(struct xpc_partition *part)
{
unsigned long irq_flags;
AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa +
(XPC_ENGAGED_PARTITIONS_AMO *
sizeof(AMO_t)));
local_irq_save(irq_flags);
/* clear bit corresponding to our partid in remote partition's AMO */
FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND,
~(1UL << sn_partition_id));
/*
* We must always use the nofault function regardless of whether we
* are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
* didn't, we'd never know that the other partition is down and would
* keep sending IPIs and AMOs to it until the heartbeat times out.
*/
(void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->
variable),
xp_nofault_PIOR_target));
local_irq_restore(irq_flags);
}
static void
xpc_request_partition_disengage_sn2(struct xpc_partition *part)
{
unsigned long irq_flags;
AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa +
(XPC_DISENGAGE_REQUEST_AMO * sizeof(AMO_t)));
local_irq_save(irq_flags);
/* set bit corresponding to our partid in remote partition's AMO */
FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_OR,
(1UL << sn_partition_id));
/*
* We must always use the nofault function regardless of whether we
* are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
* didn't, we'd never know that the other partition is down and would
* keep sending IPIs and AMOs to it until the heartbeat times out.
*/
(void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->
variable),
xp_nofault_PIOR_target));
local_irq_restore(irq_flags);
}
static void
xpc_cancel_partition_disengage_request_sn2(struct xpc_partition *part)
{
unsigned long irq_flags;
AMO_t *amo = (AMO_t *)__va(part->remote_amos_page_pa +
(XPC_DISENGAGE_REQUEST_AMO * sizeof(AMO_t)));
local_irq_save(irq_flags);
/* clear bit corresponding to our partid in remote partition's AMO */
FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND,
~(1UL << sn_partition_id));
/*
* We must always use the nofault function regardless of whether we
* are on a Shub 1.1 system or a Shub 1.2 slice 0xc processor. If we
* didn't, we'd never know that the other partition is down and would
* keep sending IPIs and AMOs to it until the heartbeat times out.
*/
(void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->
variable),
xp_nofault_PIOR_target));
local_irq_restore(irq_flags);
}
static u64
xpc_partition_engaged_sn2(u64 partid_mask)
{
AMO_t *amo = xpc_vars->amos_page + XPC_ENGAGED_PARTITIONS_AMO;
/* return our partition's AMO variable ANDed with partid_mask */
return (FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_LOAD) &
partid_mask);
}
static u64
xpc_partition_disengage_requested_sn2(u64 partid_mask)
{
AMO_t *amo = xpc_vars->amos_page + XPC_DISENGAGE_REQUEST_AMO;
/* return our partition's AMO variable ANDed with partid_mask */
return (FETCHOP_LOAD_OP(TO_AMO((u64)&amo->variable), FETCHOP_LOAD) &
partid_mask);
}
static void
xpc_clear_partition_engaged_sn2(u64 partid_mask)
{
AMO_t *amo = xpc_vars->amos_page + XPC_ENGAGED_PARTITIONS_AMO;
/* clear bit(s) based on partid_mask in our partition's AMO */
FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND,
~partid_mask);
}
static void
xpc_clear_partition_disengage_request_sn2(u64 partid_mask)
{
AMO_t *amo = xpc_vars->amos_page + XPC_DISENGAGE_REQUEST_AMO;
/* clear bit(s) based on partid_mask in our partition's AMO */
FETCHOP_STORE_OP(TO_AMO((u64)&amo->variable), FETCHOP_AND,
~partid_mask);
}
static enum xp_retval
xpc_rsvd_page_init_sn2(struct xpc_rsvd_page *rp)
{
......@@ -79,7 +440,7 @@ xpc_rsvd_page_init_sn2(struct xpc_rsvd_page *rp)
}
/* clear xpc_vars */
memset(xpc_vars, 0, sizeof(struct xpc_vars));
memset(xpc_vars, 0, sizeof(struct xpc_vars_sn2));
xpc_vars->version = XPC_V_VERSION;
xpc_vars->act_nasid = cpuid_to_nasid(0);
......@@ -94,15 +455,446 @@ xpc_rsvd_page_init_sn2(struct xpc_rsvd_page *rp)
/* 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);
(void)xpc_IPI_init_sn2(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);
(void)xpc_IPI_init_sn2(XPC_ENGAGED_PARTITIONS_AMO);
(void)xpc_IPI_init_sn2(XPC_DISENGAGE_REQUEST_AMO);
return xpSuccess;
}
static void
xpc_increment_heartbeat_sn2(void)
{
xpc_vars->heartbeat++;
}
static void
xpc_offline_heartbeat_sn2(void)
{
xpc_increment_heartbeat_sn2();
xpc_vars->heartbeat_offline = 1;
}
static void
xpc_online_heartbeat_sn2(void)
{
xpc_increment_heartbeat_sn2();
xpc_vars->heartbeat_offline = 0;
}
static void
xpc_heartbeat_init_sn2(void)
{
DBUG_ON(xpc_vars == NULL);
bitmap_zero(xpc_vars->heartbeating_to_mask, XP_MAX_NPARTITIONS_SN2);
xpc_heartbeating_to_mask = &xpc_vars->heartbeating_to_mask[0];
xpc_online_heartbeat_sn2();
}
static void
xpc_heartbeat_exit_sn2(void)
{
xpc_offline_heartbeat_sn2();
}
/*
* At periodic intervals, scan through all active partitions and ensure
* their heartbeat is still active. If not, the partition is deactivated.
*/
static void
xpc_check_remote_hb_sn2(void)
{
struct xpc_vars_sn2 *remote_vars;
struct xpc_partition *part;
short partid;
enum xp_retval ret;
remote_vars = (struct xpc_vars_sn2 *)xpc_remote_copy_buffer;
for (partid = 0; partid < xp_max_npartitions; 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 */
ret = xp_remote_memcpy(remote_vars,
(void *)part->remote_vars_pa,
XPC_RP_VARS_SIZE);
if (ret != xpSuccess) {
XPC_DEACTIVATE_PARTITION(part, ret);
continue;
}
dev_dbg(xpc_part, "partid = %d, heartbeat = %ld, last_heartbeat"
" = %ld, heartbeat_offline = %ld, HB_mask[0] = 0x%lx\n",
partid, remote_vars->heartbeat, part->last_heartbeat,
remote_vars->heartbeat_offline,
remote_vars->heartbeating_to_mask[0]);
if (((remote_vars->heartbeat == part->last_heartbeat) &&
(remote_vars->heartbeat_offline == 0)) ||
!xpc_hb_allowed(sn_partition_id,
&remote_vars->heartbeating_to_mask)) {
XPC_DEACTIVATE_PARTITION(part, xpNoHeartbeat);
continue;
}
part->last_heartbeat = remote_vars->heartbeat;
}
}
/*
* 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 xp_retval
xpc_get_remote_vars_sn2(u64 remote_vars_pa, struct xpc_vars_sn2 *remote_vars)
{
enum xp_retval ret;
if (remote_vars_pa == 0)
return xpVarsNotSet;
/* pull over the cross partition variables */
ret = xp_remote_memcpy(remote_vars, (void *)remote_vars_pa,
XPC_RP_VARS_SIZE);
if (ret != xpSuccess)
return ret;
if (XPC_VERSION_MAJOR(remote_vars->version) !=
XPC_VERSION_MAJOR(XPC_V_VERSION)) {
return xpBadVersion;
}
return xpSuccess;
}
static void
xpc_initiate_partition_activation_sn2(struct xpc_rsvd_page *remote_rp,
u64 remote_rp_pa, int nasid)
{
xpc_IPI_send_local_activate(nasid);
}
/*
* Update the remote partition's info.
*/
static void
xpc_update_partition_info_sn2(struct xpc_partition *part, u8 remote_rp_version,
struct timespec *remote_rp_stamp,
u64 remote_rp_pa, u64 remote_vars_pa,
struct xpc_vars_sn2 *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_sn2(int nasid)
{
struct xpc_rsvd_page *remote_rp;
struct xpc_vars_sn2 *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 }; /*>>> ZERO_STAMP */
short partid;
struct xpc_partition *part;
enum xp_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 != xpSuccess) {
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->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->SAL_partid;
part = &xpc_partitions[partid];
/* pull over the cross partition variables */
remote_vars = (struct xpc_vars_sn2 *)xpc_remote_copy_buffer;
ret = xpc_get_remote_vars_sn2(remote_vars_pa, remote_vars);
if (ret != xpSuccess) {
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[0]);
if (xpc_partition_disengaged(part) &&
part->act_state == XPC_P_INACTIVE) {
xpc_update_partition_info_sn2(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->heartbeating_to_mask)) {
/* 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_sn2(part, remote_rp_version,
&remote_rp_stamp, remote_rp_pa,
remote_vars_pa, remote_vars);
part->reactivate_nasid = nasid;
XPC_DEACTIVATE_PARTITION(part, xpReactivating);
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_sn2(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_sn2(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, xpReactivating);
} else if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version) &&
xpc_partition_disengage_requested(1UL << partid)) {
XPC_DEACTIVATE_PARTITION(part, xpOtherGoingDown);
}
}
/*
* 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_sn2(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_sn2(&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_sn2(nasid);
}
}
}
return n_IRQs_detected;
}
static void
xpc_process_act_IRQ_rcvd_sn2(int n_IRQs_expected)
{
int n_IRQs_detected;
n_IRQs_detected = xpc_identify_act_IRQ_sender_sn2();
if (n_IRQs_detected < n_IRQs_expected) {
/* retry once to help avoid missing AMO */
(void)xpc_identify_act_IRQ_sender_sn2();
}
}
/*
* Setup the infrastructure necessary to support XPartition Communication
* between the specified remote partition and the local one.
......@@ -177,7 +969,7 @@ xpc_setup_infrastructure_sn2(struct xpc_partition *part)
part->remote_openclose_args_pa = 0;
part->local_IPI_amo_va = xpc_IPI_init(partid);
part->local_IPI_amo_va = xpc_IPI_init_sn2(partid);
part->local_IPI_amo = 0;
spin_lock_init(&part->IPI_lock);
......@@ -468,6 +1260,28 @@ xpc_make_first_contact_sn2(struct xpc_partition *part)
{
enum xp_retval ret;
/*
* 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 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_amos_page_pa after module
* reloads and system reboots.
*/
if (sn_register_xp_addr_region(part->remote_amos_page_pa,
PAGE_SIZE, 1) < 0) {
dev_warn(xpc_part, "xpc_activating(%d) failed to register "
"xp_addr region\n", XPC_PARTID(part));
ret = xpPhysAddrRegFailed;
XPC_DEACTIVATE_PARTITION(part, ret);
return ret;
}
xpc_IPI_send_activated(part);
while ((ret = xpc_pull_remote_vars_part_sn2(part)) != xpSuccess) {
if (ret != xpRetry) {
XPC_DEACTIVATE_PARTITION(part, ret);
......@@ -651,15 +1465,370 @@ xpc_get_deliverable_msg_sn2(struct xpc_channel *ch)
return msg;
}
/*
* Now we actually send the messages that are ready to be sent by advancing
* the local message queue's Put value and then send an IPI to the recipient
* partition.
*/
static void
xpc_send_msgs_sn2(struct xpc_channel *ch, s64 initial_put)
{
struct xpc_msg *msg;
s64 put = initial_put + 1;
int send_IPI = 0;
while (1) {
while (1) {
if (put == ch->w_local_GP.put)
break;
msg = (struct xpc_msg *)((u64)ch->local_msgqueue +
(put % ch->local_nentries) *
ch->msg_size);
if (!(msg->flags & XPC_M_READY))
break;
put++;
}
if (put == initial_put) {
/* nothing's changed */
break;
}
if (cmpxchg_rel(&ch->local_GP->put, initial_put, put) !=
initial_put) {
/* someone else beat us to it */
DBUG_ON(ch->local_GP->put < initial_put);
break;
}
/* we just set the new value of local_GP->put */
dev_dbg(xpc_chan, "local_GP->put changed to %ld, partid=%d, "
"channel=%d\n", put, ch->partid, ch->number);
send_IPI = 1;
/*
* We need to ensure that the message referenced by
* local_GP->put is not XPC_M_READY or that local_GP->put
* equals w_local_GP.put, so we'll go have a look.
*/
initial_put = put;
}
if (send_IPI)
xpc_IPI_send_msgrequest_sn2(ch);
}
/*
* Allocate an entry for a message from the message queue associated with the
* specified channel.
*/
static enum xp_retval
xpc_allocate_msg_sn2(struct xpc_channel *ch, u32 flags,
struct xpc_msg **address_of_msg)
{
struct xpc_msg *msg;
enum xp_retval ret;
s64 put;
/* this reference will be dropped in xpc_send_msg_sn2() */
xpc_msgqueue_ref(ch);
if (ch->flags & XPC_C_DISCONNECTING) {
xpc_msgqueue_deref(ch);
return ch->reason;
}
if (!(ch->flags & XPC_C_CONNECTED)) {
xpc_msgqueue_deref(ch);
return xpNotConnected;
}
/*
* Get the next available message entry from the local message queue.
* If none are available, we'll make sure that we grab the latest
* GP values.
*/
ret = xpTimeout;
while (1) {
put = ch->w_local_GP.put;
rmb(); /* guarantee that .put loads before .get */
if (put - ch->w_remote_GP.get < ch->local_nentries) {
/* There are available message entries. We need to try
* to secure one for ourselves. We'll do this by trying
* to increment w_local_GP.put as long as someone else
* doesn't beat us to it. If they do, we'll have to
* try again.
*/
if (cmpxchg(&ch->w_local_GP.put, put, put + 1) == put) {
/* we got the entry referenced by put */
break;
}
continue; /* try again */
}
/*
* There aren't any available msg entries at this time.
*
* In waiting for a message entry to become available,
* we set a timeout in case the other side is not
* sending completion IPIs. This lets us fake an IPI
* that will cause the IPI handler to fetch the latest
* GP values as if an IPI was sent by the other side.
*/
if (ret == xpTimeout)
xpc_IPI_send_local_msgrequest_sn2(ch);
if (flags & XPC_NOWAIT) {
xpc_msgqueue_deref(ch);
return xpNoWait;
}
ret = xpc_allocate_msg_wait(ch);
if (ret != xpInterrupted && ret != xpTimeout) {
xpc_msgqueue_deref(ch);
return ret;
}
}
/* get the message's address and initialize it */
msg = (struct xpc_msg *)((u64)ch->local_msgqueue +
(put % ch->local_nentries) * ch->msg_size);
DBUG_ON(msg->flags != 0);
msg->number = put;
dev_dbg(xpc_chan, "w_local_GP.put changed to %ld; msg=0x%p, "
"msg_number=%ld, partid=%d, channel=%d\n", put + 1,
(void *)msg, msg->number, ch->partid, ch->number);
*address_of_msg = msg;
return xpSuccess;
}
/*
* Common code that does the actual sending of the message by advancing the
* local message queue's Put value and sends an IPI to the partition the
* message is being sent to.
*/
static enum xp_retval
xpc_send_msg_sn2(struct xpc_channel *ch, struct xpc_msg *msg, u8 notify_type,
xpc_notify_func func, void *key)
{
enum xp_retval ret = xpSuccess;
struct xpc_notify *notify = notify;
s64 put, msg_number = msg->number;
DBUG_ON(notify_type == XPC_N_CALL && func == NULL);
DBUG_ON((((u64)msg - (u64)ch->local_msgqueue) / ch->msg_size) !=
msg_number % ch->local_nentries);
DBUG_ON(msg->flags & XPC_M_READY);
if (ch->flags & XPC_C_DISCONNECTING) {
/* drop the reference grabbed in xpc_allocate_msg_sn2() */
xpc_msgqueue_deref(ch);
return ch->reason;
}
if (notify_type != 0) {
/*
* Tell the remote side to send an ACK interrupt when the
* message has been delivered.
*/
msg->flags |= XPC_M_INTERRUPT;
atomic_inc(&ch->n_to_notify);
notify = &ch->notify_queue[msg_number % ch->local_nentries];
notify->func = func;
notify->key = key;
notify->type = notify_type;
/* >>> is a mb() needed here? */
if (ch->flags & XPC_C_DISCONNECTING) {
/*
* An error occurred between our last error check and
* this one. We will try to clear the type field from
* the notify entry. If we succeed then
* xpc_disconnect_channel() didn't already process
* the notify entry.
*/
if (cmpxchg(&notify->type, notify_type, 0) ==
notify_type) {
atomic_dec(&ch->n_to_notify);
ret = ch->reason;
}
/* drop reference grabbed in xpc_allocate_msg_sn2() */
xpc_msgqueue_deref(ch);
return ret;
}
}
msg->flags |= XPC_M_READY;
/*
* The preceding store of msg->flags must occur before the following
* load of ch->local_GP->put.
*/
mb();
/* see if the message is next in line to be sent, if so send it */
put = ch->local_GP->put;
if (put == msg_number)
xpc_send_msgs_sn2(ch, put);
/* drop the reference grabbed in xpc_allocate_msg_sn2() */
xpc_msgqueue_deref(ch);
return ret;
}
/*
* Now we actually acknowledge the messages that have been delivered and ack'd
* by advancing the cached remote message queue's Get value and if requested
* send an IPI to the message sender's partition.
*/
static void
xpc_acknowledge_msgs_sn2(struct xpc_channel *ch, s64 initial_get, u8 msg_flags)
{
struct xpc_msg *msg;
s64 get = initial_get + 1;
int send_IPI = 0;
while (1) {
while (1) {
if (get == ch->w_local_GP.get)
break;
msg = (struct xpc_msg *)((u64)ch->remote_msgqueue +
(get % ch->remote_nentries) *
ch->msg_size);
if (!(msg->flags & XPC_M_DONE))
break;
msg_flags |= msg->flags;
get++;
}
if (get == initial_get) {
/* nothing's changed */
break;
}
if (cmpxchg_rel(&ch->local_GP->get, initial_get, get) !=
initial_get) {
/* someone else beat us to it */
DBUG_ON(ch->local_GP->get <= initial_get);
break;
}
/* we just set the new value of local_GP->get */
dev_dbg(xpc_chan, "local_GP->get changed to %ld, partid=%d, "
"channel=%d\n", get, ch->partid, ch->number);
send_IPI = (msg_flags & XPC_M_INTERRUPT);
/*
* We need to ensure that the message referenced by
* local_GP->get is not XPC_M_DONE or that local_GP->get
* equals w_local_GP.get, so we'll go have a look.
*/
initial_get = get;
}
if (send_IPI)
xpc_IPI_send_msgrequest_sn2(ch);
}
static void
xpc_received_msg_sn2(struct xpc_channel *ch, struct xpc_msg *msg)
{
s64 get;
s64 msg_number = msg->number;
dev_dbg(xpc_chan, "msg=0x%p, msg_number=%ld, partid=%d, channel=%d\n",
(void *)msg, msg_number, ch->partid, ch->number);
DBUG_ON((((u64)msg - (u64)ch->remote_msgqueue) / ch->msg_size) !=
msg_number % ch->remote_nentries);
DBUG_ON(msg->flags & XPC_M_DONE);
msg->flags |= XPC_M_DONE;
/*
* The preceding store of msg->flags must occur before the following
* load of ch->local_GP->get.
*/
mb();
/*
* See if this message is next in line to be acknowledged as having
* been delivered.
*/
get = ch->local_GP->get;
if (get == msg_number)
xpc_acknowledge_msgs_sn2(ch, get, msg->flags);
}
void
xpc_init_sn2(void)
{
xpc_rsvd_page_init = xpc_rsvd_page_init_sn2;
xpc_increment_heartbeat = xpc_increment_heartbeat_sn2;
xpc_offline_heartbeat = xpc_offline_heartbeat_sn2;
xpc_online_heartbeat = xpc_online_heartbeat_sn2;
xpc_heartbeat_init = xpc_heartbeat_init_sn2;
xpc_heartbeat_exit = xpc_heartbeat_exit_sn2;
xpc_check_remote_hb = xpc_check_remote_hb_sn2;
xpc_initiate_partition_activation =
xpc_initiate_partition_activation_sn2;
xpc_process_act_IRQ_rcvd = xpc_process_act_IRQ_rcvd_sn2;
xpc_setup_infrastructure = xpc_setup_infrastructure_sn2;
xpc_teardown_infrastructure = xpc_teardown_infrastructure_sn2;
xpc_make_first_contact = xpc_make_first_contact_sn2;
xpc_get_IPI_flags = xpc_get_IPI_flags_sn2;
xpc_get_deliverable_msg = xpc_get_deliverable_msg_sn2;
xpc_mark_partition_engaged = xpc_mark_partition_engaged_sn2;
xpc_mark_partition_disengaged = xpc_mark_partition_disengaged_sn2;
xpc_request_partition_disengage = xpc_request_partition_disengage_sn2;
xpc_cancel_partition_disengage_request =
xpc_cancel_partition_disengage_request_sn2;
xpc_partition_engaged = xpc_partition_engaged_sn2;
xpc_partition_disengage_requested =
xpc_partition_disengage_requested_sn2;
xpc_clear_partition_engaged = xpc_clear_partition_engaged_sn2;
xpc_clear_partition_disengage_request =
xpc_clear_partition_disengage_request_sn2;
xpc_IPI_send_local_activate = xpc_IPI_send_local_activate_sn2;
xpc_IPI_send_activated = xpc_IPI_send_activated_sn2;
xpc_IPI_send_local_reactivate = xpc_IPI_send_local_reactivate_sn2;
xpc_IPI_send_disengage = xpc_IPI_send_disengage_sn2;
xpc_IPI_send_closerequest = xpc_IPI_send_closerequest_sn2;
xpc_IPI_send_closereply = xpc_IPI_send_closereply_sn2;
xpc_IPI_send_openrequest = xpc_IPI_send_openrequest_sn2;
xpc_IPI_send_openreply = xpc_IPI_send_openreply_sn2;
xpc_allocate_msg = xpc_allocate_msg_sn2;
xpc_send_msg = xpc_send_msg_sn2;
xpc_received_msg = xpc_received_msg_sn2;
}
void
......
drivers/misc/sgi-xp/xpc_uv.c
View file @ 33ba3c77
......@@ -19,15 +19,22 @@
/* >>> 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 DECLARE_BITMAP(xpc_heartbeating_to_mask_uv, XP_MAX_NPARTITIONS_UV);
static void *xpc_activate_mq;
static void
xpc_IPI_send_local_activate_uv(struct xpc_partition *part)
{
/*
* >>> make our side think that the remote parition sent an activate
* >>> message our way. Also do what the activate IRQ handler would
* >>> do had one really been sent.
*/
}
static enum xp_retval
xpc_rsvd_page_init_uv(struct xpc_rsvd_page *rp)
{
......@@ -36,6 +43,41 @@ xpc_rsvd_page_init_uv(struct xpc_rsvd_page *rp)
return xpSuccess;
}
static void
xpc_increment_heartbeat_uv(void)
{
/* >>> send heartbeat msg to xpc_heartbeating_to_mask partids */
}
static void
xpc_heartbeat_init_uv(void)
{
bitmap_zero(xpc_heartbeating_to_mask_uv, XP_MAX_NPARTITIONS_UV);
xpc_heartbeating_to_mask = &xpc_heartbeating_to_mask_uv[0];
}
static void
xpc_heartbeat_exit_uv(void)
{
/* >>> send heartbeat_offline msg to xpc_heartbeating_to_mask partids */
}
static void
xpc_initiate_partition_activation_uv(struct xpc_rsvd_page *remote_rp,
u64 remote_rp_pa, int nasid)
{
short partid = remote_rp->SAL_partid;
struct xpc_partition *part = &xpc_partitions[partid];
/*
* >>> setup part structure with the bits of info we can glean from the rp
* >>> part->remote_rp_pa = remote_rp_pa;
* >>> part->sn.uv.activate_mq_gpa = remote_rp->sn.activate_mq_gpa;
*/
xpc_IPI_send_local_activate_uv(part);
}
/*
* Setup the infrastructure necessary to support XPartition Communication
* between the specified remote partition and the local one.
......@@ -83,6 +125,11 @@ void
xpc_init_uv(void)
{
xpc_rsvd_page_init = xpc_rsvd_page_init_uv;
xpc_increment_heartbeat = xpc_increment_heartbeat_uv;
xpc_heartbeat_init = xpc_heartbeat_init_uv;
xpc_heartbeat_exit = xpc_heartbeat_exit_uv;
xpc_initiate_partition_activation =
xpc_initiate_partition_activation_uv;
xpc_setup_infrastructure = xpc_setup_infrastructure_uv;
xpc_teardown_infrastructure = xpc_teardown_infrastructure_uv;
xpc_make_first_contact = xpc_make_first_contact_uv;
......
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