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[IA64-SGI] get XPC to cleanly disengage from remote memory references

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When XPC is being shutdown (i.e., rmmod, reboot) it doesn't ensure that
other partitions with whom it was connected have completely disengaged
from any attempt at cross-partition memory references. This can lead to
MCAs in any of these other partitions when the partition is reset.

Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Dean Nelson 2005-09-01 14:01:37 -05:00 committed by Tony Luck
parent 4706df3d3c
commit a607c38971
5 changed files with 830 additions and 246 deletions
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288
arch/ia64/sn/kernel/xpc.h
View File

@ -57,7 +57,7 @@
#define XPC_NASID_FROM_W_B(_w, _b) (((_w) * 64 + (_b)) * 2)
#define XPC_HB_DEFAULT_INTERVAL 5 /* incr HB every x secs */
#define XPC_HB_CHECK_DEFAULT_TIMEOUT 20 /* check HB every x secs */
#define XPC_HB_CHECK_DEFAULT_INTERVAL 20 /* check HB every x secs */
/* define the process name of HB checker and the CPU it is pinned to */
#define XPC_HB_CHECK_THREAD_NAME "xpc_hb"
@ -67,11 +67,6 @@
#define XPC_DISCOVERY_THREAD_NAME "xpc_discovery"
#define XPC_HB_ALLOWED(_p, _v) ((_v)->heartbeating_to_mask & (1UL << (_p)))
#define XPC_ALLOW_HB(_p, _v) (_v)->heartbeating_to_mask |= (1UL << (_p))
#define XPC_DISALLOW_HB(_p, _v) (_v)->heartbeating_to_mask &= (~(1UL << (_p)))
/*
* Reserved Page provided by SAL.
*
@ -88,14 +83,38 @@ struct xpc_rsvd_page {
u8 version;
u8 pad[6]; /* pad to u64 align */
volatile u64 vars_pa;
struct timespec stamp; /* time when reserved page was initialized */
u64 part_nasids[XP_NASID_MASK_WORDS] ____cacheline_aligned;
u64 mach_nasids[XP_NASID_MASK_WORDS] ____cacheline_aligned;
};
#define XPC_RP_VERSION _XPC_VERSION(1,0) /* version 1.0 of the reserved page */
#define XPC_RSVD_PAGE_ALIGNED_SIZE \
(L1_CACHE_ALIGN(sizeof(struct xpc_rsvd_page)))
#define XPC_RP_VERSION _XPC_VERSION(1,1) /* version 1.1 of the reserved page */
#define XPC_SUPPORTS_RP_STAMP(_version) \
(_version >= _XPC_VERSION(1,1))
/*
* compare stamps - the return value is:
*
* < 0, if stamp1 < stamp2
* = 0, if stamp1 == stamp2
* > 0, if stamp1 > stamp2
*/
static inline int
xpc_compare_stamps(struct timespec *stamp1, struct timespec *stamp2)
{
int ret;
if ((ret = stamp1->tv_sec - stamp2->tv_sec) == 0) {
ret = stamp1->tv_nsec - stamp2->tv_nsec;
}
return ret;
}
/*
* Define the structures by which XPC variables can be exported to other
@ -121,12 +140,61 @@ struct xpc_vars {
u64 vars_part_pa;
u64 amos_page_pa; /* paddr of page of AMOs from MSPEC driver */
AMO_t *amos_page; /* vaddr of page of AMOs from MSPEC driver */
AMO_t *act_amos; /* pointer to the first activation AMO */
};
#define XPC_V_VERSION _XPC_VERSION(3,0) /* version 3.0 of the cross vars */
#define XPC_VARS_ALIGNED_SIZE (L1_CACHE_ALIGN(sizeof(struct xpc_vars)))
#define XPC_V_VERSION _XPC_VERSION(3,1) /* version 3.1 of the cross vars */
#define XPC_SUPPORTS_DISENGAGE_REQUEST(_version) \
(_version >= _XPC_VERSION(3,1))
static inline int
xpc_hb_allowed(partid_t partid, struct xpc_vars *vars)
{
return ((vars->heartbeating_to_mask & (1UL << partid)) != 0);
}
static inline void
xpc_allow_hb(partid_t 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(partid_t 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 16 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).
*/
#define XPC_NOTIFY_IRQ_AMOS 0
#define XPC_ACTIVATE_IRQ_AMOS (XPC_NOTIFY_IRQ_AMOS + XP_MAX_PARTITIONS)
#define XPC_ENGAGED_PARTITIONS_AMO (XPC_ACTIVATE_IRQ_AMOS + XP_NASID_MASK_WORDS)
#define XPC_DISENGAGE_REQUEST_AMO (XPC_ENGAGED_PARTITIONS_AMO + 1)
/*
* The following structure describes the per partition specific variables.
*
@ -358,7 +426,7 @@ struct xpc_channel {
void *key; /* pointer to user's key */
struct semaphore msg_to_pull_sema; /* next msg to pull serialization */
struct semaphore teardown_sema; /* wait for teardown completion */
struct semaphore wdisconnect_sema; /* wait for channel disconnect */
struct xpc_openclose_args *local_openclose_args; /* args passed on */
/* opening or closing of channel */
@ -410,6 +478,7 @@ struct xpc_channel {
#define XPC_C_DISCONNECTED 0x00002000 /* channel is disconnected */
#define XPC_C_DISCONNECTING 0x00004000 /* channel is being disconnected */
#define XPC_C_WDISCONNECT 0x00008000 /* waiting for channel disconnect */
@ -422,6 +491,8 @@ struct xpc_partition {
/* XPC HB infrastructure */
u8 remote_rp_version; /* version# of partition's rsvd pg */
struct timespec remote_rp_stamp;/* time when rsvd pg was initialized */
u64 remote_rp_pa; /* phys addr of partition's rsvd pg */
u64 remote_vars_pa; /* phys addr of partition's vars */
u64 remote_vars_part_pa; /* phys addr of partition's vars part */
@ -432,10 +503,14 @@ struct xpc_partition {
u32 act_IRQ_rcvd; /* IRQs since activation */
spinlock_t act_lock; /* protect updating of act_state */
u8 act_state; /* from XPC HB viewpoint */
u8 remote_vars_version; /* version# of partition's vars */
enum xpc_retval reason; /* reason partition is deactivating */
int reason_line; /* line# deactivation initiated from */
int reactivate_nasid; /* nasid in partition to reactivate */
unsigned long disengage_request_timeout; /* timeout in XPC_TICKS */
struct timer_list disengage_request_timer;
/* XPC infrastructure referencing and teardown control */
@ -454,6 +529,7 @@ struct xpc_partition {
u8 nchannels; /* #of defined channels supported */
atomic_t nchannels_active; /* #of channels that are not DISCONNECTED */
atomic_t nchannels_engaged;/* #of channels engaged with remote part */
struct xpc_channel *channels;/* array of channel structures */
void *local_GPs_base; /* base address of kmalloc'd space */
@ -518,6 +594,7 @@ struct xpc_partition {
#define XPC_P_TORNDOWN 0x03 /* infrastructure is torndown */
/*
* struct xpc_partition IPI_timer #of seconds to wait before checking for
* dropped IPIs. These occur whenever an IPI amo write doesn't complete until
@ -526,6 +603,13 @@ struct xpc_partition {
#define XPC_P_DROPPED_IPI_WAIT (0.25 * HZ)
/* number of seconds to wait for other partitions to disengage */
#define XPC_DISENGAGE_REQUEST_TIMELIMIT 90
/* interval in seconds to print 'waiting disengagement' messages */
#define XPC_DISENGAGE_PRINTMSG_INTERVAL 10
#define XPC_PARTID(_p) ((partid_t) ((_p) - &xpc_partitions[0]))
@ -550,8 +634,6 @@ extern void xpc_activate_partition(struct xpc_partition *);
/* found in xpc_partition.c */
extern int xpc_exiting;
extern int xpc_hb_interval;
extern int xpc_hb_check_interval;
extern struct xpc_vars *xpc_vars;
extern struct xpc_rsvd_page *xpc_rsvd_page;
extern struct xpc_vars_part *xpc_vars_part;
@ -561,6 +643,7 @@ extern struct xpc_rsvd_page *xpc_rsvd_page_init(void);
extern void xpc_allow_IPI_ops(void);
extern void xpc_restrict_IPI_ops(void);
extern int xpc_identify_act_IRQ_sender(void);
extern int xpc_partition_disengaged(struct xpc_partition *);
extern enum xpc_retval xpc_mark_partition_active(struct xpc_partition *);
extern void xpc_mark_partition_inactive(struct xpc_partition *);
extern void xpc_discovery(void);
@ -585,8 +668,8 @@ extern void xpc_connected_callout(struct xpc_channel *);
extern void xpc_deliver_msg(struct xpc_channel *);
extern void xpc_disconnect_channel(const int, struct xpc_channel *,
enum xpc_retval, unsigned long *);
extern void xpc_disconnected_callout(struct xpc_channel *);
extern void xpc_partition_down(struct xpc_partition *, enum xpc_retval);
extern void xpc_disconnecting_callout(struct xpc_channel *);
extern void xpc_partition_going_down(struct xpc_partition *, enum xpc_retval);
extern void xpc_teardown_infrastructure(struct xpc_partition *);
@ -673,6 +756,157 @@ 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,
@ -722,13 +956,13 @@ xpc_IPI_send(AMO_t *amo, u64 flag, int nasid, int phys_cpuid, int vector)
* Flag the appropriate AMO variable and send an IPI to the specified node.
*/
static inline void
xpc_activate_IRQ_send(u64 amos_page, int from_nasid, int to_nasid,
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 +
(XP_MAX_PARTITIONS * sizeof(AMO_t)));
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,
@ -756,6 +990,13 @@ xpc_IPI_send_reactivate(struct xpc_partition *part)
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.
@ -903,17 +1144,18 @@ xpc_IPI_send_local_msgrequest(struct xpc_channel *ch)
* 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
* (XP_MAX_PARTITIONS) AMO variables for message notification (xpc_main.c)
* and an additional 16 AMO variables for partition activation (xpc_hb.c).
* (XP_MAX_PARTITIONS) AMO variables for message notification and an
* additional 16 (XP_NASID_MASK_WORDS) AMO variables for partition activation
* and 2 AMO variables for partition deactivation.
*/
static inline AMO_t *
xpc_IPI_init(partid_t partid)
xpc_IPI_init(int index)
{
AMO_t *part_amo = xpc_vars->amos_page + partid;
AMO_t *amo = xpc_vars->amos_page + index;
xpc_IPI_receive(part_amo);
return part_amo;
(void) xpc_IPI_receive(amo); /* clear AMO variable */
return amo;
}

222
arch/ia64/sn/kernel/xpc_channel.c
View File

@ -57,6 +57,7 @@ xpc_initialize_channels(struct xpc_partition *part, partid_t partid)
spin_lock_init(&ch->lock);
sema_init(&ch->msg_to_pull_sema, 1); /* mutex */
sema_init(&ch->wdisconnect_sema, 0); /* event wait */
atomic_set(&ch->n_on_msg_allocate_wq, 0);
init_waitqueue_head(&ch->msg_allocate_wq);
@ -166,6 +167,7 @@ xpc_setup_infrastructure(struct xpc_partition *part)
xpc_initialize_channels(part, partid);
atomic_set(&part->nchannels_active, 0);
atomic_set(&part->nchannels_engaged, 0);
/* local_IPI_amo were set to 0 by an earlier memset() */
@ -555,8 +557,6 @@ xpc_allocate_msgqueues(struct xpc_channel *ch)
sema_init(&ch->notify_queue[i].sema, 0);
}
sema_init(&ch->teardown_sema, 0); /* event wait */
spin_lock_irqsave(&ch->lock, irq_flags);
ch->flags |= XPC_C_SETUP;
spin_unlock_irqrestore(&ch->lock, irq_flags);
@ -625,6 +625,55 @@ xpc_process_connect(struct xpc_channel *ch, unsigned long *irq_flags)
}
/*
* Notify those who wanted to be notified upon delivery of their message.
*/
static void
xpc_notify_senders(struct xpc_channel *ch, enum xpc_retval reason, s64 put)
{
struct xpc_notify *notify;
u8 notify_type;
s64 get = ch->w_remote_GP.get - 1;
while (++get < put && atomic_read(&ch->n_to_notify) > 0) {
notify = &ch->notify_queue[get % ch->local_nentries];
/*
* See if the notify entry indicates it was associated with
* a message who's sender wants to be notified. It is possible
* that it is, but someone else is doing or has done the
* notification.
*/
notify_type = notify->type;
if (notify_type == 0 ||
cmpxchg(&notify->type, notify_type, 0) !=
notify_type) {
continue;
}
DBUG_ON(notify_type != XPC_N_CALL);
atomic_dec(&ch->n_to_notify);
if (notify->func != NULL) {
dev_dbg(xpc_chan, "notify->func() called, notify=0x%p, "
"msg_number=%ld, partid=%d, channel=%d\n",
(void *) notify, get, ch->partid, ch->number);
notify->func(reason, ch->partid, ch->number,
notify->key);
dev_dbg(xpc_chan, "notify->func() returned, "
"notify=0x%p, msg_number=%ld, partid=%d, "
"channel=%d\n", (void *) notify, get,
ch->partid, ch->number);
}
}
}
/*
* Free up message queues and other stuff that were allocated for the specified
* channel.
@ -669,9 +718,6 @@ xpc_free_msgqueues(struct xpc_channel *ch)
ch->remote_msgqueue = NULL;
kfree(ch->notify_queue);
ch->notify_queue = NULL;
/* in case someone is waiting for the teardown to complete */
up(&ch->teardown_sema);
}
}
@ -683,7 +729,7 @@ static void
xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags)
{
struct xpc_partition *part = &xpc_partitions[ch->partid];
u32 ch_flags = ch->flags;
u32 channel_was_connected = (ch->flags & XPC_C_WASCONNECTED);
DBUG_ON(!spin_is_locked(&ch->lock));
@ -701,12 +747,13 @@ xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags)
}
DBUG_ON(atomic_read(&ch->kthreads_assigned) != 0);
/* it's now safe to free the channel's message queues */
if (part->act_state == XPC_P_DEACTIVATING) {
/* can't proceed until the other side disengages from us */
if (xpc_partition_engaged(1UL << ch->partid)) {
return;
}
xpc_free_msgqueues(ch);
DBUG_ON(ch->flags & XPC_C_SETUP);
if (part->act_state != XPC_P_DEACTIVATING) {
} else {
/* as long as the other side is up do the full protocol */
@ -724,16 +771,33 @@ xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags)
}
}
/* wake those waiting for notify completion */
if (atomic_read(&ch->n_to_notify) > 0) {
/* >>> we do callout while holding ch->lock */
xpc_notify_senders(ch, ch->reason, ch->w_local_GP.put);
}
/* both sides are disconnected now */
ch->flags = XPC_C_DISCONNECTED; /* clear all flags, but this one */
/* it's now safe to free the channel's message queues */
xpc_free_msgqueues(ch);
/* mark disconnected, clear all other flags except XPC_C_WDISCONNECT */
ch->flags = (XPC_C_DISCONNECTED | (ch->flags & XPC_C_WDISCONNECT));
atomic_dec(&part->nchannels_active);
if (ch_flags & XPC_C_WASCONNECTED) {
if (channel_was_connected) {
dev_info(xpc_chan, "channel %d to partition %d disconnected, "
"reason=%d\n", ch->number, ch->partid, ch->reason);
}
/* wake the thread that is waiting for this channel to disconnect */
if (ch->flags & XPC_C_WDISCONNECT) {
spin_unlock_irqrestore(&ch->lock, *irq_flags);
up(&ch->wdisconnect_sema);
spin_lock_irqsave(&ch->lock, *irq_flags);
}
}
@ -764,7 +828,7 @@ xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number,
/*
* If RCLOSEREQUEST is set, we're probably waiting for
* RCLOSEREPLY. We should find it and a ROPENREQUEST packed
* with this RCLOSEQREUQEST in the IPI_flags.
* with this RCLOSEREQUEST in the IPI_flags.
*/
if (ch->flags & XPC_C_RCLOSEREQUEST) {
@ -852,7 +916,7 @@ xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number,
"channel=%d\n", args->msg_size, args->local_nentries,
ch->partid, ch->number);
if ((ch->flags & XPC_C_DISCONNECTING) ||
if ((ch->flags & (XPC_C_DISCONNECTING | XPC_C_WDISCONNECT)) ||
part->act_state == XPC_P_DEACTIVATING) {
spin_unlock_irqrestore(&ch->lock, irq_flags);
return;
@ -1039,55 +1103,6 @@ xpc_connect_channel(struct xpc_channel *ch)
}
/*
* Notify those who wanted to be notified upon delivery of their message.
*/
static void
xpc_notify_senders(struct xpc_channel *ch, enum xpc_retval reason, s64 put)
{
struct xpc_notify *notify;
u8 notify_type;
s64 get = ch->w_remote_GP.get - 1;
while (++get < put && atomic_read(&ch->n_to_notify) > 0) {
notify = &ch->notify_queue[get % ch->local_nentries];
/*
* See if the notify entry indicates it was associated with
* a message who's sender wants to be notified. It is possible
* that it is, but someone else is doing or has done the
* notification.
*/
notify_type = notify->type;
if (notify_type == 0 ||
cmpxchg(&notify->type, notify_type, 0) !=
notify_type) {
continue;
}
DBUG_ON(notify_type != XPC_N_CALL);
atomic_dec(&ch->n_to_notify);
if (notify->func != NULL) {
dev_dbg(xpc_chan, "notify->func() called, notify=0x%p, "
"msg_number=%ld, partid=%d, channel=%d\n",
(void *) notify, get, ch->partid, ch->number);
notify->func(reason, ch->partid, ch->number,
notify->key);
dev_dbg(xpc_chan, "notify->func() returned, "
"notify=0x%p, msg_number=%ld, partid=%d, "
"channel=%d\n", (void *) notify, get,
ch->partid, ch->number);
}
}
}
/*
* Clear some of the msg flags in the local message queue.
*/
@ -1240,6 +1255,7 @@ xpc_process_channel_activity(struct xpc_partition *part)
u64 IPI_amo, IPI_flags;
struct xpc_channel *ch;
int ch_number;
u32 ch_flags;
IPI_amo = xpc_get_IPI_flags(part);
@ -1266,8 +1282,9 @@ xpc_process_channel_activity(struct xpc_partition *part)
xpc_process_openclose_IPI(part, ch_number, IPI_flags);
}
ch_flags = ch->flags; /* need an atomic snapshot of flags */
if (ch->flags & XPC_C_DISCONNECTING) {
if (ch_flags & XPC_C_DISCONNECTING) {
spin_lock_irqsave(&ch->lock, irq_flags);
xpc_process_disconnect(ch, &irq_flags);
spin_unlock_irqrestore(&ch->lock, irq_flags);
@ -1278,9 +1295,9 @@ xpc_process_channel_activity(struct xpc_partition *part)
continue;
}
if (!(ch->flags & XPC_C_CONNECTED)) {
if (!(ch->flags & XPC_C_OPENREQUEST)) {
DBUG_ON(ch->flags & XPC_C_SETUP);
if (!(ch_flags & XPC_C_CONNECTED)) {
if (!(ch_flags & XPC_C_OPENREQUEST)) {
DBUG_ON(ch_flags & XPC_C_SETUP);
(void) xpc_connect_channel(ch);
} else {
spin_lock_irqsave(&ch->lock, irq_flags);
@ -1305,8 +1322,8 @@ xpc_process_channel_activity(struct xpc_partition *part)
/*
* XPC's heartbeat code calls this function to inform XPC that a partition has
* gone down. XPC responds by tearing down the XPartition Communication
* XPC's heartbeat code calls this function to inform XPC that a partition is
* going down. XPC responds by tearing down the XPartition Communication
* infrastructure used for the just downed partition.
*
* XPC's heartbeat code will never call this function and xpc_partition_up()
@ -1314,7 +1331,7 @@ xpc_process_channel_activity(struct xpc_partition *part)
* at the same time.
*/
void
xpc_partition_down(struct xpc_partition *part, enum xpc_retval reason)
xpc_partition_going_down(struct xpc_partition *part, enum xpc_retval reason)
{
unsigned long irq_flags;
int ch_number;
@ -1330,12 +1347,11 @@ xpc_partition_down(struct xpc_partition *part, enum xpc_retval reason)
}
/* disconnect all channels associated with the downed partition */
/* disconnect channels associated with the partition going down */
for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
ch = &part->channels[ch_number];
xpc_msgqueue_ref(ch);
spin_lock_irqsave(&ch->lock, irq_flags);
@ -1370,6 +1386,7 @@ xpc_teardown_infrastructure(struct xpc_partition *part)
* this partition.
*/
DBUG_ON(atomic_read(&part->nchannels_engaged) != 0);
DBUG_ON(atomic_read(&part->nchannels_active) != 0);
DBUG_ON(part->setup_state != XPC_P_SETUP);
part->setup_state = XPC_P_WTEARDOWN;
@ -1506,8 +1523,12 @@ xpc_initiate_disconnect(int ch_number)
spin_lock_irqsave(&ch->lock, irq_flags);
XPC_DISCONNECT_CHANNEL(ch, xpcUnregistering,
if (!(ch->flags & XPC_C_DISCONNECTED)) {
ch->flags |= XPC_C_WDISCONNECT;
XPC_DISCONNECT_CHANNEL(ch, xpcUnregistering,
&irq_flags);
}
spin_unlock_irqrestore(&ch->lock, irq_flags);
@ -1523,8 +1544,9 @@ xpc_initiate_disconnect(int ch_number)
/*
* To disconnect a channel, and reflect it back to all who may be waiting.
*
* >>> An OPEN is not allowed until XPC_C_DISCONNECTING is cleared by
* >>> xpc_free_msgqueues().
* An OPEN is not allowed until XPC_C_DISCONNECTING is cleared by
* xpc_process_disconnect(), and if set, XPC_C_WDISCONNECT is cleared by
* xpc_disconnect_wait().
*
* THE CHANNEL IS TO BE LOCKED BY THE CALLER AND WILL REMAIN LOCKED UPON RETURN.
*/
@ -1532,7 +1554,7 @@ void
xpc_disconnect_channel(const int line, struct xpc_channel *ch,
enum xpc_retval reason, unsigned long *irq_flags)
{
u32 flags;
u32 channel_was_connected = (ch->flags & XPC_C_CONNECTED);
DBUG_ON(!spin_is_locked(&ch->lock));
@ -1547,37 +1569,28 @@ xpc_disconnect_channel(const int line, struct xpc_channel *ch,
XPC_SET_REASON(ch, reason, line);
flags = ch->flags;
ch->flags |= (XPC_C_CLOSEREQUEST | XPC_C_DISCONNECTING);
/* some of these may not have been set */
ch->flags &= ~(XPC_C_OPENREQUEST | XPC_C_OPENREPLY |
XPC_C_ROPENREQUEST | XPC_C_ROPENREPLY |
XPC_C_CONNECTING | XPC_C_CONNECTED);
ch->flags |= (XPC_C_CLOSEREQUEST | XPC_C_DISCONNECTING);
xpc_IPI_send_closerequest(ch, irq_flags);
if (flags & XPC_C_CONNECTED) {
if (channel_was_connected) {
ch->flags |= XPC_C_WASCONNECTED;
}
if (atomic_read(&ch->kthreads_idle) > 0) {
/* wake all idle kthreads so they can exit */
wake_up_all(&ch->idle_wq);
}
spin_unlock_irqrestore(&ch->lock, *irq_flags);
/* wake those waiting to allocate an entry from the local msg queue */
if (atomic_read(&ch->n_on_msg_allocate_wq) > 0) {
wake_up(&ch->msg_allocate_wq);
/* wake all idle kthreads so they can exit */
if (atomic_read(&ch->kthreads_idle) > 0) {
wake_up_all(&ch->idle_wq);
}
/* wake those waiting for notify completion */
if (atomic_read(&ch->n_to_notify) > 0) {
xpc_notify_senders(ch, reason, ch->w_local_GP.put);
/* wake those waiting to allocate an entry from the local msg queue */
if (atomic_read(&ch->n_on_msg_allocate_wq) > 0) {
wake_up(&ch->msg_allocate_wq);
}
spin_lock_irqsave(&ch->lock, *irq_flags);
@ -1585,23 +1598,24 @@ xpc_disconnect_channel(const int line, struct xpc_channel *ch,
void
xpc_disconnected_callout(struct xpc_channel *ch)
xpc_disconnecting_callout(struct xpc_channel *ch)
{
/*
* Let the channel's registerer know that the channel is now
* Let the channel's registerer know that the channel is being
* disconnected. We don't want to do this if the registerer was never
* informed of a connection being made, unless the disconnect was for
* abnormal reasons.
* informed of a connection being made.
*/
if (ch->func != NULL) {
dev_dbg(xpc_chan, "ch->func() called, reason=%d, partid=%d, "
"channel=%d\n", ch->reason, ch->partid, ch->number);
dev_dbg(xpc_chan, "ch->func() called, reason=xpcDisconnecting,"
" partid=%d, channel=%d\n", ch->partid, ch->number);
ch->func(ch->reason, ch->partid, ch->number, NULL, ch->key);
ch->func(xpcDisconnecting, ch->partid, ch->number, NULL,
ch->key);
dev_dbg(xpc_chan, "ch->func() returned, reason=%d, partid=%d, "
"channel=%d\n", ch->reason, ch->partid, ch->number);
dev_dbg(xpc_chan, "ch->func() returned, reason="
"xpcDisconnecting, partid=%d, channel=%d\n",
ch->partid, ch->number);
}
}
@ -1848,7 +1862,7 @@ xpc_send_msg(struct xpc_channel *ch, struct xpc_msg *msg, u8 notify_type,
xpc_notify_func func, void *key)
{
enum xpc_retval ret = xpcSuccess;
struct xpc_notify *notify = NULL; // >>> to keep the compiler happy!!
struct xpc_notify *notify = notify;
s64 put, msg_number = msg->number;

242
arch/ia64/sn/kernel/xpc_main.c
View File

@ -54,6 +54,7 @@
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/reboot.h>
#include <asm/sn/intr.h>
#include <asm/sn/sn_sal.h>
#include <asm/uaccess.h>
@ -82,11 +83,13 @@ struct device *xpc_chan = &xpc_chan_dbg_subname;
/* systune related variables for /proc/sys directories */
static int xpc_hb_min = 1;
static int xpc_hb_max = 10;
static int xpc_hb_interval = XPC_HB_DEFAULT_INTERVAL;
static int xpc_hb_min_interval = 1;
static int xpc_hb_max_interval = 10;
static int xpc_hb_check_min = 10;
static int xpc_hb_check_max = 120;
static int xpc_hb_check_interval = XPC_HB_CHECK_DEFAULT_INTERVAL;
static int xpc_hb_check_min_interval = 10;
static int xpc_hb_check_max_interval = 120;
static ctl_table xpc_sys_xpc_hb_dir[] = {
{
@ -99,7 +102,8 @@ static ctl_table xpc_sys_xpc_hb_dir[] = {
&proc_dointvec_minmax,
&sysctl_intvec,
NULL,
&xpc_hb_min, &xpc_hb_max
&xpc_hb_min_interval,
&xpc_hb_max_interval
},
{
2,
@ -111,7 +115,8 @@ static ctl_table xpc_sys_xpc_hb_dir[] = {
&proc_dointvec_minmax,
&sysctl_intvec,
NULL,
&xpc_hb_check_min, &xpc_hb_check_max
&xpc_hb_check_min_interval,
&xpc_hb_check_max_interval
},
{0}
};
@ -148,11 +153,11 @@ static DECLARE_WAIT_QUEUE_HEAD(xpc_act_IRQ_wq);
static unsigned long xpc_hb_check_timeout;
/* xpc_hb_checker thread exited notification */
static DECLARE_MUTEX_LOCKED(xpc_hb_checker_exited);
/* used as an indication of when the xpc_hb_checker thread is inactive */
static DECLARE_MUTEX_LOCKED(xpc_hb_checker_inactive);
/* xpc_discovery thread exited notification */
static DECLARE_MUTEX_LOCKED(xpc_discovery_exited);
/* used as an indication of when the xpc_discovery thread is inactive */
static DECLARE_MUTEX_LOCKED(xpc_discovery_inactive);
static struct timer_list xpc_hb_timer;
@ -161,6 +166,30 @@ 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 *);
static struct notifier_block xpc_reboot_notifier = {
.notifier_call = xpc_system_reboot,
};
/*
* Timer function to enforce the timelimit on the partition disengage request.
*/
static void
xpc_timeout_partition_disengage_request(unsigned long data)
{
struct xpc_partition *part = (struct xpc_partition *) data;
DBUG_ON(XPC_TICKS < part->disengage_request_timeout);
(void) xpc_partition_disengaged(part);
DBUG_ON(part->disengage_request_timeout != 0);
DBUG_ON(xpc_partition_engaged(1UL << XPC_PARTID(part)) != 0);
}
/*
* Notify the heartbeat check thread that an IRQ has been received.
*/
@ -214,12 +243,6 @@ xpc_hb_checker(void *ignore)
while (!(volatile int) xpc_exiting) {
/* wait for IRQ or timeout */
(void) wait_event_interruptible(xpc_act_IRQ_wq,
(last_IRQ_count < atomic_read(&xpc_act_IRQ_rcvd) ||
jiffies >= xpc_hb_check_timeout ||
(volatile int) xpc_exiting));
dev_dbg(xpc_part, "woke up with %d ticks rem; %d IRQs have "
"been received\n",
(int) (xpc_hb_check_timeout - jiffies),
@ -240,6 +263,7 @@ xpc_hb_checker(void *ignore)
}
/* check for outstanding IRQs */
new_IRQ_count = atomic_read(&xpc_act_IRQ_rcvd);
if (last_IRQ_count < new_IRQ_count || force_IRQ != 0) {
force_IRQ = 0;
@ -257,13 +281,19 @@ xpc_hb_checker(void *ignore)
xpc_hb_check_timeout = jiffies +
(xpc_hb_check_interval * HZ);
}
/* wait for IRQ or timeout */
(void) wait_event_interruptible(xpc_act_IRQ_wq,
(last_IRQ_count < atomic_read(&xpc_act_IRQ_rcvd) ||
jiffies >= xpc_hb_check_timeout ||
(volatile int) xpc_exiting));
}
dev_dbg(xpc_part, "heartbeat checker is exiting\n");
/* mark this thread as inactive */
up(&xpc_hb_checker_exited);
up(&xpc_hb_checker_inactive);
return 0;
}
@ -283,7 +313,7 @@ xpc_initiate_discovery(void *ignore)
dev_dbg(xpc_part, "discovery thread is exiting\n");
/* mark this thread as inactive */
up(&xpc_discovery_exited);
up(&xpc_discovery_inactive);
return 0;
}
@ -309,7 +339,7 @@ xpc_make_first_contact(struct xpc_partition *part)
"partition %d\n", XPC_PARTID(part));
/* wait a 1/4 of a second or so */
msleep_interruptible(250);
(void) msleep_interruptible(250);
if (part->act_state == XPC_P_DEACTIVATING) {
return part->reason;
@ -336,7 +366,8 @@ static void
xpc_channel_mgr(struct xpc_partition *part)
{
while (part->act_state != XPC_P_DEACTIVATING ||
atomic_read(&part->nchannels_active) > 0) {
atomic_read(&part->nchannels_active) > 0 ||
!xpc_partition_disengaged(part)) {
xpc_process_channel_activity(part);
@ -360,7 +391,8 @@ xpc_channel_mgr(struct xpc_partition *part)
(volatile u64) part->local_IPI_amo != 0 ||
((volatile u8) part->act_state ==
XPC_P_DEACTIVATING &&
atomic_read(&part->nchannels_active) == 0)));
atomic_read(&part->nchannels_active) == 0 &&
xpc_partition_disengaged(part))));
atomic_set(&part->channel_mgr_requests, 1);
// >>> Does it need to wakeup periodically as well? In case we
@ -482,7 +514,7 @@ xpc_activating(void *__partid)
return 0;
}
XPC_ALLOW_HB(partid, xpc_vars);
xpc_allow_hb(partid, xpc_vars);
xpc_IPI_send_activated(part);
@ -492,6 +524,7 @@ xpc_activating(void *__partid)
*/
(void) xpc_partition_up(part);
xpc_disallow_hb(partid, xpc_vars);
xpc_mark_partition_inactive(part);
if (part->reason == xpcReactivating) {
@ -704,11 +737,14 @@ xpc_daemonize_kthread(void *args)
xpc_kthread_waitmsgs(part, ch);
}
if (atomic_dec_return(&ch->kthreads_assigned) == 0 &&
((ch->flags & XPC_C_CONNECTCALLOUT) ||
(ch->reason != xpcUnregistering &&
ch->reason != xpcOtherUnregistering))) {
xpc_disconnected_callout(ch);
if (atomic_dec_return(&ch->kthreads_assigned) == 0) {
if (ch->flags & XPC_C_CONNECTCALLOUT) {
xpc_disconnecting_callout(ch);
}
if (atomic_dec_return(&part->nchannels_engaged) == 0) {
xpc_mark_partition_disengaged(part);
xpc_IPI_send_disengage(part);
}
}
@ -740,6 +776,7 @@ xpc_create_kthreads(struct xpc_channel *ch, int needed)
unsigned long irq_flags;
pid_t pid;
u64 args = XPC_PACK_ARGS(ch->partid, ch->number);
struct xpc_partition *part = &xpc_partitions[ch->partid];
while (needed-- > 0) {
@ -770,9 +807,13 @@ xpc_create_kthreads(struct xpc_channel *ch, int needed)
* kthread. That kthread is responsible for doing the
* counterpart to the following before it exits.
*/
(void) xpc_part_ref(&xpc_partitions[ch->partid]);
(void) xpc_part_ref(part);
xpc_msgqueue_ref(ch);
atomic_inc(&ch->kthreads_assigned);
if (atomic_inc_return(&ch->kthreads_assigned) == 1) {
if (atomic_inc_return(&part->nchannels_engaged) == 1) {
xpc_mark_partition_engaged(part);
}
}
ch->kthreads_created++; // >>> temporary debug only!!!
}
}
@ -781,6 +822,7 @@ xpc_create_kthreads(struct xpc_channel *ch, int needed)
void
xpc_disconnect_wait(int ch_number)
{
unsigned long irq_flags;
partid_t partid;
struct xpc_partition *part;
struct xpc_channel *ch;
@ -793,10 +835,13 @@ xpc_disconnect_wait(int ch_number)
if (xpc_part_ref(part)) {
ch = &part->channels[ch_number];
// >>> how do we keep from falling into the window between our check and going
// >>> down and coming back up where sema is re-inited?
if (ch->flags & XPC_C_SETUP) {
(void) down(&ch->teardown_sema);
if (ch->flags & XPC_C_WDISCONNECT) {
if (!(ch->flags & XPC_C_DISCONNECTED)) {
(void) down(&ch->wdisconnect_sema);
}
spin_lock_irqsave(&ch->lock, irq_flags);
ch->flags &= ~XPC_C_WDISCONNECT;
spin_unlock_irqrestore(&ch->lock, irq_flags);
}
xpc_part_deref(part);
@ -806,62 +851,89 @@ xpc_disconnect_wait(int ch_number)
static void
xpc_do_exit(void)
xpc_do_exit(enum xpc_retval reason)
{
partid_t partid;
int active_part_count;
struct xpc_partition *part;
unsigned long printmsg_time;
/* now it's time to eliminate our heartbeat */
del_timer_sync(&xpc_hb_timer);
xpc_vars->heartbeating_to_mask = 0;
/* indicate to others that our reserved page is uninitialized */
xpc_rsvd_page->vars_pa = 0;
/* a 'rmmod XPC' and a 'reboot' cannot both end up here together */
DBUG_ON(xpc_exiting == 1);
/*
* Ignore all incoming interrupts. Without interupts the heartbeat
* checker won't activate any new partitions that may come up.
*/
free_irq(SGI_XPC_ACTIVATE, NULL);
/*
* Cause the heartbeat checker and the discovery threads to exit.
* We don't want them attempting to activate new partitions as we
* try to deactivate the existing ones.
* Let the heartbeat checker thread and the discovery thread
* (if one is running) know that they should exit. Also wake up
* the heartbeat checker thread in case it's sleeping.
*/
xpc_exiting = 1;
wake_up_interruptible(&xpc_act_IRQ_wq);
/* wait for the heartbeat checker thread to mark itself inactive */
down(&xpc_hb_checker_exited);
/* ignore all incoming interrupts */
free_irq(SGI_XPC_ACTIVATE, NULL);
/* wait for the discovery thread to mark itself inactive */
down(&xpc_discovery_exited);
down(&xpc_discovery_inactive);
/* wait for the heartbeat checker thread to mark itself inactive */
down(&xpc_hb_checker_inactive);
msleep_interruptible(300);
/* sleep for a 1/3 of a second or so */
(void) msleep_interruptible(300);
/* wait for all partitions to become inactive */
printmsg_time = jiffies;
do {
active_part_count = 0;
for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
part = &xpc_partitions[partid];
if (part->act_state != XPC_P_INACTIVE) {
active_part_count++;
XPC_DEACTIVATE_PARTITION(part, xpcUnloading);
if (xpc_partition_disengaged(part) &&
part->act_state == XPC_P_INACTIVE) {
continue;
}
active_part_count++;
XPC_DEACTIVATE_PARTITION(part, reason);
}
if (active_part_count)
msleep_interruptible(300);
} while (active_part_count > 0);
if (active_part_count == 0) {
break;
}
if (jiffies >= printmsg_time) {
dev_info(xpc_part, "waiting for partitions to "
"deactivate/disengage, active count=%d, remote "
"engaged=0x%lx\n", active_part_count,
xpc_partition_engaged(1UL << partid));
printmsg_time = jiffies +
(XPC_DISENGAGE_PRINTMSG_INTERVAL * HZ);
}
/* sleep for a 1/3 of a second or so */
(void) msleep_interruptible(300);
} while (1);
DBUG_ON(xpc_partition_engaged(-1UL));
/* indicate to others that our reserved page is uninitialized */
xpc_rsvd_page->vars_pa = 0;
/* now it's time to eliminate our heartbeat */
del_timer_sync(&xpc_hb_timer);
DBUG_ON(xpc_vars->heartbeating_to_mask == 0);
/* take ourselves off of the reboot_notifier_list */
(void) unregister_reboot_notifier(&xpc_reboot_notifier);
/* close down protections for IPI operations */
xpc_restrict_IPI_ops();
@ -876,6 +948,34 @@ xpc_do_exit(void)
}
/*
* This function is called when the system is being rebooted.
*/
static int
xpc_system_reboot(struct notifier_block *nb, unsigned long event, void *unused)
{
enum xpc_retval reason;
switch (event) {
case SYS_RESTART:
reason = xpcSystemReboot;
break;
case SYS_HALT:
reason = xpcSystemHalt;
break;
case SYS_POWER_OFF:
reason = xpcSystemPoweroff;
break;
default:
reason = xpcSystemGoingDown;
}
xpc_do_exit(reason);
return NOTIFY_DONE;
}
int __init
xpc_init(void)
{
@ -920,6 +1020,12 @@ xpc_init(void)
spin_lock_init(&part->act_lock);
part->act_state = XPC_P_INACTIVE;
XPC_SET_REASON(part, 0, 0);
init_timer(&part->disengage_request_timer);
part->disengage_request_timer.function =
xpc_timeout_partition_disengage_request;
part->disengage_request_timer.data = (unsigned long) part;
part->setup_state = XPC_P_UNSET;
init_waitqueue_head(&part->teardown_wq);
atomic_set(&part->references, 0);
@ -976,6 +1082,13 @@ xpc_init(void)
}
/* add ourselves to the reboot_notifier_list */
ret = register_reboot_notifier(&xpc_reboot_notifier);
if (ret != 0) {
dev_warn(xpc_part, "can't register reboot notifier\n");
}
/*
* Set the beating to other partitions into motion. This is
* the last requirement for other partitions' discovery to
@ -997,6 +1110,9 @@ xpc_init(void)
/* indicate to others that our reserved page is uninitialized */
xpc_rsvd_page->vars_pa = 0;
/* take ourselves off of the reboot_notifier_list */
(void) unregister_reboot_notifier(&xpc_reboot_notifier);
del_timer_sync(&xpc_hb_timer);
free_irq(SGI_XPC_ACTIVATE, NULL);
xpc_restrict_IPI_ops();
@ -1018,9 +1134,9 @@ xpc_init(void)
dev_err(xpc_part, "failed while forking discovery thread\n");
/* mark this new thread as a non-starter */
up(&xpc_discovery_exited);
up(&xpc_discovery_inactive);
xpc_do_exit();
xpc_do_exit(xpcUnloading);
return -EBUSY;
}
@ -1039,7 +1155,7 @@ module_init(xpc_init);
void __exit
xpc_exit(void)
{
xpc_do_exit();
xpc_do_exit(xpcUnloading);
}
module_exit(xpc_exit);

314
arch/ia64/sn/kernel/xpc_partition.c
View File

@ -76,11 +76,6 @@ char ____cacheline_aligned
xpc_remote_copy_buffer[XPC_RSVD_PAGE_ALIGNED_SIZE];
/* systune related variables */
int xpc_hb_interval = XPC_HB_DEFAULT_INTERVAL;
int xpc_hb_check_interval = XPC_HB_CHECK_DEFAULT_TIMEOUT;
/*
* Given a nasid, get the physical address of the partition's reserved page
* for that nasid. This function returns 0 on any error.
@ -239,16 +234,21 @@ xpc_rsvd_page_init(void)
xpc_vars->amos_page = amos_page; /* save for next load of XPC */
/*
* Initialize the activation related AMO variables.
*/
xpc_vars->act_amos = xpc_IPI_init(XP_MAX_PARTITIONS);
for (i = 1; i < XP_NASID_MASK_WORDS; i++) {
xpc_IPI_init(i + XP_MAX_PARTITIONS);
/* 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);
/* export AMO page's physical address to other partitions */
xpc_vars->amos_page_pa = ia64_tpa((u64) xpc_vars->amos_page);
/* timestamp of when reserved page was initialized */
rp->stamp = CURRENT_TIME;
/*
* This signifies to the remote partition that our reserved
* page is initialized.
@ -387,6 +387,11 @@ xpc_check_remote_hb(void)
remote_vars = (struct xpc_vars *) xpc_remote_copy_buffer;
for (partid = 1; partid < XP_MAX_PARTITIONS; partid++) {
if (xpc_exiting) {
break;
}
if (partid == sn_partition_id) {
continue;
}
@ -417,7 +422,7 @@ xpc_check_remote_hb(void)
if (((remote_vars->heartbeat == part->last_heartbeat) &&
(remote_vars->kdb_status == 0)) ||
!XPC_HB_ALLOWED(sn_partition_id, remote_vars)) {
!xpc_hb_allowed(sn_partition_id, remote_vars)) {
XPC_DEACTIVATE_PARTITION(part, xpcNoHeartbeat);
continue;
@ -436,23 +441,23 @@ xpc_check_remote_hb(void)
*/
static enum xpc_retval
xpc_get_remote_rp(int nasid, u64 *discovered_nasids,
struct xpc_rsvd_page *remote_rp, u64 *remote_rsvd_page_pa)
struct xpc_rsvd_page *remote_rp, u64 *remote_rp_pa)
{
int bres, i;
/* get the reserved page's physical address */
*remote_rsvd_page_pa = xpc_get_rsvd_page_pa(nasid, (u64) remote_rp,
*remote_rp_pa = xpc_get_rsvd_page_pa(nasid, (u64) remote_rp,
XPC_RSVD_PAGE_ALIGNED_SIZE);
if (*remote_rsvd_page_pa == 0) {
if (*remote_rp_pa == 0) {
return xpcNoRsvdPageAddr;
}
/* pull over the reserved page structure */
bres = xp_bte_copy(*remote_rsvd_page_pa, ia64_tpa((u64) remote_rp),
bres = xp_bte_copy(*remote_rp_pa, ia64_tpa((u64) remote_rp),
XPC_RSVD_PAGE_ALIGNED_SIZE,
(BTE_NOTIFY | BTE_WACQUIRE), NULL);
if (bres != BTE_SUCCESS) {
@ -523,6 +528,55 @@ xpc_get_remote_vars(u64 remote_vars_pa, struct xpc_vars *remote_vars)
}
/*
* 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%016lx\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 determine the nasid which generated an IPI. Inspect
* that nasid to determine if its partition needs to be activated or
@ -542,8 +596,12 @@ xpc_identify_act_IRQ_req(int nasid)
{
struct xpc_rsvd_page *remote_rp;
struct xpc_vars *remote_vars;
u64 remote_rsvd_page_pa;
u64 remote_rp_pa;
u64 remote_vars_pa;
int remote_rp_version;
int reactivate = 0;
int stamp_diff;
struct timespec remote_rp_stamp = { 0, 0 };
partid_t partid;
struct xpc_partition *part;
enum xpc_retval ret;
@ -553,7 +611,7 @@ xpc_identify_act_IRQ_req(int nasid)
remote_rp = (struct xpc_rsvd_page *) xpc_remote_copy_buffer;
ret = xpc_get_remote_rp(nasid, NULL, remote_rp, &remote_rsvd_page_pa);
ret = xpc_get_remote_rp(nasid, NULL, remote_rp, &remote_rp_pa);
if (ret != xpcSuccess) {
dev_warn(xpc_part, "unable to get reserved page from nasid %d, "
"which sent interrupt, reason=%d\n", nasid, ret);
@ -561,6 +619,10 @@ xpc_identify_act_IRQ_req(int nasid)
}
remote_vars_pa = remote_rp->vars_pa;
remote_rp_version = remote_rp->version;
if (XPC_SUPPORTS_RP_STAMP(remote_rp_version)) {
remote_rp_stamp = remote_rp->stamp;
}
partid = remote_rp->partid;
part = &xpc_partitions[partid];
@ -586,44 +648,117 @@ xpc_identify_act_IRQ_req(int nasid)
"%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) {
if (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);
part->remote_rp_pa = remote_rsvd_page_pa;
dev_dbg(xpc_part, " remote_rp_pa = 0x%016lx\n",
part->remote_rp_pa);
part->remote_vars_pa = remote_vars_pa;
dev_dbg(xpc_part, " remote_vars_pa = 0x%016lx\n",
part->remote_vars_pa);
part->last_heartbeat = remote_vars->heartbeat;
dev_dbg(xpc_part, " last_heartbeat = 0x%016lx\n",
part->last_heartbeat);
part->remote_vars_part_pa = remote_vars->vars_part_pa;
dev_dbg(xpc_part, " remote_vars_part_pa = 0x%016lx\n",
part->remote_vars_part_pa);
part->remote_act_nasid = remote_vars->act_nasid;
dev_dbg(xpc_part, " remote_act_nasid = 0x%x\n",
part->remote_act_nasid);
part->remote_act_phys_cpuid = remote_vars->act_phys_cpuid;
dev_dbg(xpc_part, " remote_act_phys_cpuid = 0x%x\n",
part->remote_act_phys_cpuid);
part->remote_amos_page_pa = remote_vars->amos_page_pa;
dev_dbg(xpc_part, " remote_amos_page_pa = 0x%lx\n",
part->remote_amos_page_pa);
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;
}
} else if (part->remote_amos_page_pa != remote_vars->amos_page_pa ||
!XPC_HB_ALLOWED(sn_partition_id, remote_vars)) {
DBUG_ON(part->remote_rp_version == 0);
DBUG_ON(part->remote_vars_version == 0);
if (!XPC_SUPPORTS_RP_STAMP(part->remote_rp_version)) {
DBUG_ON(XPC_SUPPORTS_DISENGAGE_REQUEST(part->
remote_vars_version));
if (!XPC_SUPPORTS_RP_STAMP(remote_rp_version)) {
DBUG_ON(XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->
version));
/* see if the other side rebooted */
if (part->remote_amos_page_pa ==
remote_vars->amos_page_pa &&
xpc_hb_allowed(sn_partition_id,
remote_vars)) {
/* doesn't look that way, so ignore the IPI */
return;
}
}
/*
* Other side rebooted and previous XPC didn't support the
* disengage request, so we don't need to do anything special.
*/
xpc_update_partition_info(part, remote_rp_version,
&remote_rp_stamp, remote_rp_pa,
remote_vars_pa, remote_vars);
part->reactivate_nasid = nasid;
XPC_DEACTIVATE_PARTITION(part, xpcReactivating);
return;
}
DBUG_ON(!XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version));
if (!XPC_SUPPORTS_RP_STAMP(remote_rp_version)) {
DBUG_ON(!XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->version));
/*
* Other side rebooted and previous XPC did support the
* disengage request, but the new one doesn't.
*/
xpc_clear_partition_engaged(1UL << partid);
xpc_clear_partition_disengage_request(1UL << partid);
xpc_update_partition_info(part, remote_rp_version,
&remote_rp_stamp, remote_rp_pa,
remote_vars_pa, remote_vars);
reactivate = 1;
} else {
DBUG_ON(!XPC_SUPPORTS_DISENGAGE_REQUEST(remote_vars->version));
stamp_diff = xpc_compare_stamps(&part->remote_rp_stamp,
&remote_rp_stamp);
if (stamp_diff != 0) {
DBUG_ON(stamp_diff >= 0);
/*
* Other side rebooted and the previous XPC did support
* the disengage request, as does the new one.
*/
DBUG_ON(xpc_partition_engaged(1UL << partid));
DBUG_ON(xpc_partition_disengage_requested(1UL <<
partid));
xpc_update_partition_info(part, remote_rp_version,
&remote_rp_stamp, remote_rp_pa,
remote_vars_pa, remote_vars);
reactivate = 1;
}
}
if (!xpc_partition_disengaged(part)) {
/* still waiting on other side to disengage from us */
return;
}
if (reactivate) {
part->reactivate_nasid = nasid;
XPC_DEACTIVATE_PARTITION(part, xpcReactivating);
} else if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version) &&
xpc_partition_disengage_requested(1UL << partid)) {
XPC_DEACTIVATE_PARTITION(part, xpcOtherGoingDown);
}
}
@ -646,12 +781,16 @@ xpc_identify_act_IRQ_sender(void)
struct xpc_rsvd_page *rp = (struct xpc_rsvd_page *) xpc_rsvd_page;
act_amos = xpc_vars->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 */
@ -687,6 +826,55 @@ xpc_identify_act_IRQ_sender(void)
}
/*
* See if the other side has responded to a partition disengage request
* from us.
*/
int
xpc_partition_disengaged(struct xpc_partition *part)
{
partid_t partid = XPC_PARTID(part);
int disengaged;
disengaged = (xpc_partition_engaged(1UL << partid) == 0);
if (part->disengage_request_timeout) {
if (!disengaged) {
if (jiffies < part->disengage_request_timeout) {
/* timelimit hasn't been reached yet */
return 0;
}
/*
* Other side hasn't responded to our disengage
* request in a timely fashion, so assume it's dead.
*/
xpc_clear_partition_engaged(1UL << partid);
disengaged = 1;
}
part->disengage_request_timeout = 0;
/* cancel the timer function, provided it's not us */
if (!in_interrupt()) {
del_singleshot_timer_sync(&part->
disengage_request_timer);
}
DBUG_ON(part->act_state != XPC_P_DEACTIVATING &&
part->act_state != XPC_P_INACTIVE);
if (part->act_state != XPC_P_INACTIVE) {
xpc_wakeup_channel_mgr(part);
}
if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version)) {
xpc_cancel_partition_disengage_request(part);
}
}
return disengaged;
}
/*
* Mark specified partition as active.
*/
@ -721,7 +909,6 @@ xpc_deactivate_partition(const int line, struct xpc_partition *part,
enum xpc_retval reason)
{
unsigned long irq_flags;
partid_t partid = XPC_PARTID(part);
spin_lock_irqsave(&part->act_lock, irq_flags);
@ -749,17 +936,27 @@ xpc_deactivate_partition(const int line, struct xpc_partition *part,
spin_unlock_irqrestore(&part->act_lock, irq_flags);
XPC_DISALLOW_HB(partid, xpc_vars);
if (XPC_SUPPORTS_DISENGAGE_REQUEST(part->remote_vars_version)) {
xpc_request_partition_disengage(part);
xpc_IPI_send_disengage(part);
/* set a timelimit on the disengage request */
part->disengage_request_timeout = jiffies +
(XPC_DISENGAGE_REQUEST_TIMELIMIT * HZ);
part->disengage_request_timer.expires =
part->disengage_request_timeout;
add_timer(&part->disengage_request_timer);
}
dev_dbg(xpc_part, "bringing partition %d down, reason = %d\n", partid,
reason);
xpc_partition_down(part, reason);
xpc_partition_going_down(part, reason);
}
/*
* Mark specified partition as active.
* Mark specified partition as inactive.
*/
void
xpc_mark_partition_inactive(struct xpc_partition *part)
@ -792,7 +989,7 @@ xpc_discovery(void)
void *remote_rp_base;
struct xpc_rsvd_page *remote_rp;
struct xpc_vars *remote_vars;
u64 remote_rsvd_page_pa;
u64 remote_rp_pa;
u64 remote_vars_pa;
int region;
int max_regions;
@ -877,7 +1074,7 @@ xpc_discovery(void)
/* pull over the reserved page structure */
ret = xpc_get_remote_rp(nasid, discovered_nasids,
remote_rp, &remote_rsvd_page_pa);
remote_rp, &remote_rp_pa);
if (ret != xpcSuccess) {
dev_dbg(xpc_part, "unable to get reserved page "
"from nasid %d, reason=%d\n", nasid,
@ -948,6 +1145,13 @@ xpc_discovery(void)
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);
}
}

10
include/asm-ia64/sn/xp.h
View File

@ -217,7 +217,15 @@ enum xpc_retval {
xpcInvalidPartid, /* 42: invalid partition ID */
xpcLocalPartid, /* 43: local partition ID */
xpcUnknownReason /* 44: unknown reason -- must be last in list */
xpcOtherGoingDown, /* 44: other side going down, reason unknown */
xpcSystemGoingDown, /* 45: system is going down, reason unknown */
xpcSystemHalt, /* 46: system is being halted */
xpcSystemReboot, /* 47: system is being rebooted */
xpcSystemPoweroff, /* 48: system is being powered off */
xpcDisconnecting, /* 49: channel disconnecting (closing) */
xpcUnknownReason /* 50: unknown reason -- must be last in list */
};