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sgi-xp: separate chctl_flags from XPC's notify IRQ

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Tie current IPI references to either XPC's notify IRQ or channel control
flags.

Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dean Nelson 2008-07-29 22:34:10 -07:00 committed by Linus Torvalds
parent a47d5dac9d
commit 7fb5e59d63
5 changed files with 325 additions and 300 deletions
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122
drivers/misc/sgi-xp/xpc.h
View File

@ -186,9 +186,10 @@ struct xpc_vars_part_sn2 {
u64 openclose_args_pa; /* physical address of open and close args */
u64 GPs_pa; /* physical address of Get/Put values */
u64 IPI_amo_pa; /* physical address of IPI AMO_t structure */
int IPI_nasid; /* nasid of where to send IPIs */
int IPI_phys_cpuid; /* physical CPU ID of where to send IPIs */
u64 chctl_amo_pa; /* physical address of chctl flags' AMO_t */
int notify_IRQ_nasid; /* nasid of where to send notify IRQs */
int notify_IRQ_phys_cpuid; /* CPUID of where to send notify IRQs */
u8 nchannels; /* #of defined channels supported */
@ -407,7 +408,7 @@ struct xpc_channel {
atomic_t n_on_msg_allocate_wq; /* #on msg allocation wait queue */
wait_queue_head_t msg_allocate_wq; /* msg allocation wait queue */
u8 delayed_IPI_flags; /* IPI flags received, but delayed */
u8 delayed_chctl_flags; /* chctl flags received, but delayed */
/* action until channel disconnected */
/* queue of msg senders who want to be notified when msg received */
@ -469,6 +470,54 @@ struct xpc_channel {
0x00020000 /* disconnecting callout completed */
#define XPC_C_WDISCONNECT 0x00040000 /* waiting for channel disconnect */
/*
* The channel control flags (chctl) union consists of a 64-bit variable which
* 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 channel's byte
* can have one or more of the chctl flags set in it.
*/
union xpc_channel_ctl_flags {
u64 all_flags;
u8 flags[XPC_MAX_NCHANNELS];
};
/* chctl flags */
#define XPC_CHCTL_CLOSEREQUEST 0x01
#define XPC_CHCTL_CLOSEREPLY 0x02
#define XPC_CHCTL_OPENREQUEST 0x04
#define XPC_CHCTL_OPENREPLY 0x08
#define XPC_CHCTL_MSGREQUEST 0x10
#define XPC_OPENCLOSE_CHCTL_FLAGS \
(XPC_CHCTL_CLOSEREQUEST | XPC_CHCTL_CLOSEREPLY | \
XPC_CHCTL_OPENREQUEST | XPC_CHCTL_OPENREPLY)
#define XPC_MSG_CHCTL_FLAGS XPC_CHCTL_MSGREQUEST
static inline int
xpc_any_openclose_chctl_flags_set(union xpc_channel_ctl_flags *chctl)
{
int ch_number;
for (ch_number = 0; ch_number < XPC_MAX_NCHANNELS; ch_number++) {
if (chctl->flags[ch_number] & XPC_OPENCLOSE_CHCTL_FLAGS)
return 1;
}
return 0;
}
static inline int
xpc_any_msg_chctl_flags_set(union xpc_channel_ctl_flags *chctl)
{
int ch_number;
for (ch_number = 0; ch_number < XPC_MAX_NCHANNELS; ch_number++) {
if (chctl->flags[ch_number] & XPC_MSG_CHCTL_FLAGS)
return 1;
}
return 0;
}
/*
* Manages channels on a partition basis. There is one of these structures
* for each partition (a partition will never utilize the structure that
@ -494,12 +543,12 @@ struct xpc_partition_sn2 {
u64 remote_openclose_args_pa; /* phys addr of remote's args */
int remote_IPI_nasid; /* nasid of where to send IPIs */
int remote_IPI_phys_cpuid; /* phys CPU ID of where to send IPIs */
char IPI_owner[8]; /* IPI owner's name */
int notify_IRQ_nasid; /* nasid of where to send notify IRQs */
int notify_IRQ_phys_cpuid; /* CPUID of where to send notify IRQs */
char notify_IRQ_owner[8]; /* notify IRQ's owner's name */
AMO_t *remote_IPI_amo_va; /* address of remote IPI AMO_t structure */
AMO_t *local_IPI_amo_va; /* address of IPI AMO_t structure */
AMO_t *remote_chctl_amo_va; /* address of remote chctl flags' AMO_t */
AMO_t *local_chctl_amo_va; /* address of chctl flags' AMO_t */
struct timer_list dropped_notify_IRQ_timer; /* dropped IRQ timer */
};
@ -536,7 +585,10 @@ struct xpc_partition {
atomic_t nchannels_engaged; /* #of channels engaged with remote part */
struct xpc_channel *channels; /* array of channel structures */
/* fields used to pass args when opening or closing a channel */
/* fields used for managing channel avialability and activity */
union xpc_channel_ctl_flags chctl; /* chctl flags yet to be processed */
spinlock_t chctl_lock; /* chctl flags lock */
void *local_openclose_args_base; /* base address of kmalloc'd space */
struct xpc_openclose_args *local_openclose_args; /* local's args */
@ -544,11 +596,6 @@ struct xpc_partition {
struct xpc_openclose_args *remote_openclose_args; /* copy of remote's */
/* args */
/* IPI sending, receiving and handling related fields */
u64 local_IPI_amo; /* IPI amo flags yet to be handled */
spinlock_t IPI_lock; /* IPI handler lock */
/* channel manager related fields */
atomic_t channel_mgr_requests; /* #of requests to activate chan mgr */
@ -580,11 +627,12 @@ 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
* after the IPI was received.
* struct xpc_partition_sn2's dropped notify IRQ timer is set to wait the
* following interval #of seconds before checking for dropped notify IRQs.
* These can occur whenever an IRQ's associated amo write doesn't complete
* until after the IRQ was received.
*/
#define XPC_P_DROPPED_IPI_WAIT_INTERVAL (0.25 * HZ)
#define XPC_DROPPED_NOTIFY_IRQ_WAIT_INTERVAL (0.25 * HZ)
/* number of seconds to wait for other partitions to disengage */
#define XPC_DISENGAGE_DEFAULT_TIMELIMIT 90
@ -617,9 +665,9 @@ 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 u64 (*xpc_get_chctl_all_flags) (struct xpc_partition *);
extern void (*xpc_notify_senders_of_disconnect) (struct xpc_channel *);
extern void (*xpc_process_msg_IPI) (struct xpc_partition *, int);
extern void (*xpc_process_msg_chctl_flags) (struct xpc_partition *, int);
extern int (*xpc_n_of_deliverable_msgs) (struct xpc_channel *);
extern struct xpc_msg *(*xpc_get_deliverable_msg) (struct xpc_channel *);
extern void (*xpc_request_partition_activation) (struct xpc_rsvd_page *, u64,
@ -638,14 +686,13 @@ extern int (*xpc_any_partition_engaged) (void);
extern void (*xpc_indicate_partition_disengaged) (struct xpc_partition *);
extern void (*xpc_assume_partition_disengaged) (short);
extern void (*xpc_send_channel_closerequest) (struct xpc_channel *,
extern void (*xpc_send_chctl_closerequest) (struct xpc_channel *,
unsigned long *);
extern void (*xpc_send_channel_closereply) (struct xpc_channel *,
extern void (*xpc_send_chctl_closereply) (struct xpc_channel *,
unsigned long *);
extern void (*xpc_send_channel_openrequest) (struct xpc_channel *,
unsigned long *);
extern void (*xpc_send_channel_openreply) (struct xpc_channel *,
extern void (*xpc_send_chctl_openrequest) (struct xpc_channel *,
unsigned long *);
extern void (*xpc_send_chctl_openreply) (struct xpc_channel *, unsigned long *);
extern enum xp_retval (*xpc_send_msg) (struct xpc_channel *, u32, void *, u16,
u8, xpc_notify_func, void *);
@ -689,7 +736,7 @@ extern enum xp_retval xpc_initiate_send(short, int, u32, void *, u16);
extern enum xp_retval xpc_initiate_send_notify(short, int, u32, void *, u16,
xpc_notify_func, void *);
extern void xpc_initiate_received(short, int, void *);
extern void xpc_process_channel_activity(struct xpc_partition *);
extern void xpc_process_sent_chctl_flags(struct xpc_partition *);
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 *,
@ -799,25 +846,4 @@ xpc_part_ref(struct xpc_partition *part)
(_p)->reason_line = _line; \
}
/*
* 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
* the following IPI flags.
*/
#define XPC_IPI_CLOSEREQUEST 0x01
#define XPC_IPI_CLOSEREPLY 0x02
#define XPC_IPI_OPENREQUEST 0x04
#define XPC_IPI_OPENREPLY 0x08
#define XPC_IPI_MSGREQUEST 0x10
/* 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)
#endif /* _DRIVERS_MISC_SGIXP_XPC_H */

131
drivers/misc/sgi-xp/xpc_channel.c
View File

@ -201,7 +201,7 @@ xpc_process_connect(struct xpc_channel *ch, unsigned long *irq_flags)
if (!(ch->flags & XPC_C_OPENREPLY)) {
ch->flags |= XPC_C_OPENREPLY;
xpc_send_channel_openreply(ch, irq_flags);
xpc_send_chctl_openreply(ch, irq_flags);
}
if (!(ch->flags & XPC_C_ROPENREPLY))
@ -307,7 +307,7 @@ xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags)
if (!(ch->flags & XPC_C_CLOSEREPLY)) {
ch->flags |= XPC_C_CLOSEREPLY;
xpc_send_channel_closereply(ch, irq_flags);
xpc_send_chctl_closereply(ch, irq_flags);
}
if (!(ch->flags & XPC_C_RCLOSEREPLY))
@ -344,15 +344,15 @@ xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags)
if (ch->flags & XPC_C_WDISCONNECT) {
/* we won't lose the CPU since we're holding ch->lock */
complete(&ch->wdisconnect_wait);
} else if (ch->delayed_IPI_flags) {
} else if (ch->delayed_chctl_flags) {
if (part->act_state != XPC_P_DEACTIVATING) {
/* time to take action on any delayed IPI flags */
spin_lock(&part->IPI_lock);
XPC_SET_IPI_FLAGS(part->local_IPI_amo, ch->number,
ch->delayed_IPI_flags);
spin_unlock(&part->IPI_lock);
/* time to take action on any delayed chctl flags */
spin_lock(&part->chctl_lock);
part->chctl.flags[ch->number] |=
ch->delayed_chctl_flags;
spin_unlock(&part->chctl_lock);
}
ch->delayed_IPI_flags = 0;
ch->delayed_chctl_flags = 0;
}
}
@ -360,8 +360,8 @@ xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags)
* Process a change in the channel's remote connection state.
*/
static void
xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number,
u8 IPI_flags)
xpc_process_openclose_chctl_flags(struct xpc_partition *part, int ch_number,
u8 chctl_flags)
{
unsigned long irq_flags;
struct xpc_openclose_args *args =
@ -376,24 +376,24 @@ again:
if ((ch->flags & XPC_C_DISCONNECTED) &&
(ch->flags & XPC_C_WDISCONNECT)) {
/*
* Delay processing IPI flags until thread waiting disconnect
* Delay processing chctl flags until thread waiting disconnect
* has had a chance to see that the channel is disconnected.
*/
ch->delayed_IPI_flags |= IPI_flags;
ch->delayed_chctl_flags |= chctl_flags;
spin_unlock_irqrestore(&ch->lock, irq_flags);
return;
}
if (IPI_flags & XPC_IPI_CLOSEREQUEST) {
if (chctl_flags & XPC_CHCTL_CLOSEREQUEST) {
dev_dbg(xpc_chan, "XPC_IPI_CLOSEREQUEST (reason=%d) received "
dev_dbg(xpc_chan, "XPC_CHCTL_CLOSEREQUEST (reason=%d) received "
"from partid=%d, channel=%d\n", args->reason,
ch->partid, ch->number);
/*
* If RCLOSEREQUEST is set, we're probably waiting for
* RCLOSEREPLY. We should find it and a ROPENREQUEST packed
* with this RCLOSEREQUEST in the IPI_flags.
* with this RCLOSEREQUEST in the chctl_flags.
*/
if (ch->flags & XPC_C_RCLOSEREQUEST) {
@ -402,8 +402,8 @@ again:
DBUG_ON(!(ch->flags & XPC_C_CLOSEREPLY));
DBUG_ON(ch->flags & XPC_C_RCLOSEREPLY);
DBUG_ON(!(IPI_flags & XPC_IPI_CLOSEREPLY));
IPI_flags &= ~XPC_IPI_CLOSEREPLY;
DBUG_ON(!(chctl_flags & XPC_CHCTL_CLOSEREPLY));
chctl_flags &= ~XPC_CHCTL_CLOSEREPLY;
ch->flags |= XPC_C_RCLOSEREPLY;
/* both sides have finished disconnecting */
@ -413,17 +413,15 @@ again:
}
if (ch->flags & XPC_C_DISCONNECTED) {
if (!(IPI_flags & XPC_IPI_OPENREQUEST)) {
if ((XPC_GET_IPI_FLAGS(part->local_IPI_amo,
ch_number) &
XPC_IPI_OPENREQUEST)) {
if (!(chctl_flags & XPC_CHCTL_OPENREQUEST)) {
if (part->chctl.flags[ch_number] &
XPC_CHCTL_OPENREQUEST) {
DBUG_ON(ch->delayed_IPI_flags != 0);
spin_lock(&part->IPI_lock);
XPC_SET_IPI_FLAGS(part->local_IPI_amo,
ch_number,
XPC_IPI_CLOSEREQUEST);
spin_unlock(&part->IPI_lock);
DBUG_ON(ch->delayed_chctl_flags != 0);
spin_lock(&part->chctl_lock);
part->chctl.flags[ch_number] |=
XPC_CHCTL_CLOSEREQUEST;
spin_unlock(&part->chctl_lock);
}
spin_unlock_irqrestore(&ch->lock, irq_flags);
return;
@ -436,7 +434,7 @@ again:
ch->flags |= (XPC_C_CONNECTING | XPC_C_ROPENREQUEST);
}
IPI_flags &= ~(XPC_IPI_OPENREQUEST | XPC_IPI_OPENREPLY);
chctl_flags &= ~(XPC_CHCTL_OPENREQUEST | XPC_CHCTL_OPENREPLY);
/*
* The meaningful CLOSEREQUEST connection state fields are:
@ -454,7 +452,7 @@ again:
XPC_DISCONNECT_CHANNEL(ch, reason, &irq_flags);
DBUG_ON(IPI_flags & XPC_IPI_CLOSEREPLY);
DBUG_ON(chctl_flags & XPC_CHCTL_CLOSEREPLY);
spin_unlock_irqrestore(&ch->lock, irq_flags);
return;
}
@ -462,10 +460,10 @@ again:
xpc_process_disconnect(ch, &irq_flags);
}
if (IPI_flags & XPC_IPI_CLOSEREPLY) {
if (chctl_flags & XPC_CHCTL_CLOSEREPLY) {
dev_dbg(xpc_chan, "XPC_IPI_CLOSEREPLY received from partid=%d,"
" channel=%d\n", ch->partid, ch->number);
dev_dbg(xpc_chan, "XPC_CHCTL_CLOSEREPLY received from partid="
"%d, channel=%d\n", ch->partid, ch->number);
if (ch->flags & XPC_C_DISCONNECTED) {
DBUG_ON(part->act_state != XPC_P_DEACTIVATING);
@ -476,15 +474,14 @@ again:
DBUG_ON(!(ch->flags & XPC_C_CLOSEREQUEST));
if (!(ch->flags & XPC_C_RCLOSEREQUEST)) {
if ((XPC_GET_IPI_FLAGS(part->local_IPI_amo, ch_number)
& XPC_IPI_CLOSEREQUEST)) {
if (part->chctl.flags[ch_number] &
XPC_CHCTL_CLOSEREQUEST) {
DBUG_ON(ch->delayed_IPI_flags != 0);
spin_lock(&part->IPI_lock);
XPC_SET_IPI_FLAGS(part->local_IPI_amo,
ch_number,
XPC_IPI_CLOSEREPLY);
spin_unlock(&part->IPI_lock);
DBUG_ON(ch->delayed_chctl_flags != 0);
spin_lock(&part->chctl_lock);
part->chctl.flags[ch_number] |=
XPC_CHCTL_CLOSEREPLY;
spin_unlock(&part->chctl_lock);
}
spin_unlock_irqrestore(&ch->lock, irq_flags);
return;
@ -498,9 +495,9 @@ again:
}
}
if (IPI_flags & XPC_IPI_OPENREQUEST) {
if (chctl_flags & XPC_CHCTL_OPENREQUEST) {
dev_dbg(xpc_chan, "XPC_IPI_OPENREQUEST (msg_size=%d, "
dev_dbg(xpc_chan, "XPC_CHCTL_OPENREQUEST (msg_size=%d, "
"local_nentries=%d) received from partid=%d, "
"channel=%d\n", args->msg_size, args->local_nentries,
ch->partid, ch->number);
@ -512,7 +509,7 @@ again:
}
if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_WDISCONNECT)) {
ch->delayed_IPI_flags |= XPC_IPI_OPENREQUEST;
ch->delayed_chctl_flags |= XPC_CHCTL_OPENREQUEST;
spin_unlock_irqrestore(&ch->lock, irq_flags);
return;
}
@ -554,13 +551,13 @@ again:
xpc_process_connect(ch, &irq_flags);
}
if (IPI_flags & XPC_IPI_OPENREPLY) {
if (chctl_flags & XPC_CHCTL_OPENREPLY) {
dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY (local_msgqueue_pa=0x%lx, "
"local_nentries=%d, remote_nentries=%d) received from "
"partid=%d, channel=%d\n", args->local_msgqueue_pa,
args->local_nentries, args->remote_nentries,
ch->partid, ch->number);
dev_dbg(xpc_chan, "XPC_CHCTL_OPENREPLY (local_msgqueue_pa="
"0x%lx, local_nentries=%d, remote_nentries=%d) "
"received from partid=%d, channel=%d\n",
args->local_msgqueue_pa, args->local_nentries,
args->remote_nentries, ch->partid, ch->number);
if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_DISCONNECTED)) {
spin_unlock_irqrestore(&ch->lock, irq_flags);
@ -591,7 +588,7 @@ again:
ch->remote_msgqueue_pa = args->local_msgqueue_pa;
if (args->local_nentries < ch->remote_nentries) {
dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY: new "
dev_dbg(xpc_chan, "XPC_CHCTL_OPENREPLY: new "
"remote_nentries=%d, old remote_nentries=%d, "
"partid=%d, channel=%d\n",
args->local_nentries, ch->remote_nentries,
@ -600,7 +597,7 @@ again:
ch->remote_nentries = args->local_nentries;
}
if (args->remote_nentries < ch->local_nentries) {
dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY: new "
dev_dbg(xpc_chan, "XPC_CHCTL_OPENREPLY: new "
"local_nentries=%d, old local_nentries=%d, "
"partid=%d, channel=%d\n",
args->remote_nentries, ch->local_nentries,
@ -690,7 +687,7 @@ xpc_connect_channel(struct xpc_channel *ch)
/* initiate the connection */
ch->flags |= (XPC_C_OPENREQUEST | XPC_C_CONNECTING);
xpc_send_channel_openrequest(ch, &irq_flags);
xpc_send_chctl_openrequest(ch, &irq_flags);
xpc_process_connect(ch, &irq_flags);
@ -700,15 +697,15 @@ xpc_connect_channel(struct xpc_channel *ch)
}
void
xpc_process_channel_activity(struct xpc_partition *part)
xpc_process_sent_chctl_flags(struct xpc_partition *part)
{
unsigned long irq_flags;
u64 IPI_amo, IPI_flags;
union xpc_channel_ctl_flags chctl;
struct xpc_channel *ch;
int ch_number;
u32 ch_flags;
IPI_amo = xpc_get_IPI_flags(part);
chctl.all_flags = xpc_get_chctl_all_flags(part);
/*
* Initiate channel connections for registered channels.
@ -721,14 +718,14 @@ xpc_process_channel_activity(struct xpc_partition *part)
ch = &part->channels[ch_number];
/*
* Process any open or close related IPI flags, and then deal
* Process any open or close related chctl flags, and then deal
* with connecting or disconnecting the channel as required.
*/
IPI_flags = XPC_GET_IPI_FLAGS(IPI_amo, ch_number);
if (XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(IPI_flags))
xpc_process_openclose_IPI(part, ch_number, IPI_flags);
if (chctl.flags[ch_number] & XPC_OPENCLOSE_CHCTL_FLAGS) {
xpc_process_openclose_chctl_flags(part, ch_number,
chctl.flags[ch_number]);
}
ch_flags = ch->flags; /* need an atomic snapshot of flags */
@ -755,13 +752,13 @@ xpc_process_channel_activity(struct xpc_partition *part)
}
/*
* Process any message related IPI flags, this may involve the
* activation of kthreads to deliver any pending messages sent
* from the other partition.
* Process any message related chctl flags, this may involve
* the activation of kthreads to deliver any pending messages
* sent from the other partition.
*/
if (XPC_ANY_MSG_IPI_FLAGS_SET(IPI_flags))
xpc_process_msg_IPI(part, ch_number);
if (chctl.flags[ch_number] & XPC_MSG_CHCTL_FLAGS)
xpc_process_msg_chctl_flags(part, ch_number);
}
}
@ -937,7 +934,7 @@ xpc_disconnect_channel(const int line, struct xpc_channel *ch,
XPC_C_ROPENREQUEST | XPC_C_ROPENREPLY |
XPC_C_CONNECTING | XPC_C_CONNECTED);
xpc_send_channel_closerequest(ch, irq_flags);
xpc_send_chctl_closerequest(ch, irq_flags);
if (channel_was_connected)
ch->flags |= XPC_C_WASCONNECTED;

55
drivers/misc/sgi-xp/xpc_main.c
View File

@ -25,18 +25,18 @@
*
* Caveats:
*
* . We currently have no way to determine which nasid an IPI came
* from. Thus, >>> xpc_IPI_send() does a remote AMO write followed by
* an IPI. The AMO indicates where data is to be pulled from, so
* after the IPI arrives, the remote partition checks the AMO word.
* The IPI can actually arrive before the AMO however, so other code
* must periodically check for this case. Also, remote AMO operations
* do not reliably time out. Thus we do a remote PIO read solely to
* know whether the remote partition is down and whether we should
* stop sending IPIs to it. This remote PIO read operation is set up
* in a special nofault region so SAL knows to ignore (and cleanup)
* any errors due to the remote AMO write, PIO read, and/or PIO
* write operations.
* . Currently on sn2, we have no way to determine which nasid an IRQ
* came from. Thus, xpc_send_IRQ_sn2() does a remote AMO write
* followed by an IPI. The AMO indicates where data is to be pulled
* from, so after the IPI arrives, the remote partition checks the AMO
* word. The IPI can actually arrive before the AMO however, so other
* code must periodically check for this case. Also, remote AMO
* operations do not reliably time out. Thus we do a remote PIO read
* solely to know whether the remote partition is down and whether we
* should stop sending IPIs to it. This remote PIO read operation is
* set up in a special nofault region so SAL knows to ignore (and
* cleanup) any errors due to the remote AMO write, PIO read, and/or
* PIO write operations.
*
* If/when new hardware solves this IPI problem, we should abandon
* the current approach.
@ -185,8 +185,8 @@ void (*xpc_check_remote_hb) (void);
enum xp_retval (*xpc_make_first_contact) (struct xpc_partition *part);
void (*xpc_notify_senders_of_disconnect) (struct xpc_channel *ch);
u64 (*xpc_get_IPI_flags) (struct xpc_partition *part);
void (*xpc_process_msg_IPI) (struct xpc_partition *part, int ch_number);
u64 (*xpc_get_chctl_all_flags) (struct xpc_partition *part);
void (*xpc_process_msg_chctl_flags) (struct xpc_partition *part, int ch_number);
int (*xpc_n_of_deliverable_msgs) (struct xpc_channel *ch);
struct xpc_msg *(*xpc_get_deliverable_msg) (struct xpc_channel *ch);
@ -206,13 +206,13 @@ int (*xpc_any_partition_engaged) (void);
void (*xpc_indicate_partition_disengaged) (struct xpc_partition *part);
void (*xpc_assume_partition_disengaged) (short partid);
void (*xpc_send_channel_closerequest) (struct xpc_channel *ch,
void (*xpc_send_chctl_closerequest) (struct xpc_channel *ch,
unsigned long *irq_flags);
void (*xpc_send_channel_closereply) (struct xpc_channel *ch,
void (*xpc_send_chctl_closereply) (struct xpc_channel *ch,
unsigned long *irq_flags);
void (*xpc_send_channel_openrequest) (struct xpc_channel *ch,
void (*xpc_send_chctl_openrequest) (struct xpc_channel *ch,
unsigned long *irq_flags);
void (*xpc_send_channel_openreply) (struct xpc_channel *ch,
void (*xpc_send_chctl_openreply) (struct xpc_channel *ch,
unsigned long *irq_flags);
enum xp_retval (*xpc_send_msg) (struct xpc_channel *ch, u32 flags,
@ -302,7 +302,7 @@ xpc_hb_checker(void *ignore)
/*
* We need to periodically recheck to ensure no
* IPI/AMO pairs have been missed. That check
* IRQ/AMO pairs have been missed. That check
* must always reset xpc_hb_check_timeout.
*/
force_IRQ = 1;
@ -378,7 +378,7 @@ xpc_channel_mgr(struct xpc_partition *part)
atomic_read(&part->nchannels_active) > 0 ||
!xpc_partition_disengaged(part)) {
xpc_process_channel_activity(part);
xpc_process_sent_chctl_flags(part);
/*
* Wait until we've been requested to activate kthreads or
@ -396,7 +396,7 @@ xpc_channel_mgr(struct xpc_partition *part)
atomic_dec(&part->channel_mgr_requests);
(void)wait_event_interruptible(part->channel_mgr_wq,
(atomic_read(&part->channel_mgr_requests) > 0 ||
part->local_IPI_amo != 0 ||
part->chctl.all_flags != 0 ||
(part->act_state == XPC_P_DEACTIVATING &&
atomic_read(&part->nchannels_active) == 0 &&
xpc_partition_disengaged(part))));
@ -753,16 +753,15 @@ xpc_disconnect_wait(int ch_number)
DBUG_ON(!(ch->flags & XPC_C_DISCONNECTED));
wakeup_channel_mgr = 0;
if (ch->delayed_IPI_flags) {
if (ch->delayed_chctl_flags) {
if (part->act_state != XPC_P_DEACTIVATING) {
spin_lock(&part->IPI_lock);
XPC_SET_IPI_FLAGS(part->local_IPI_amo,
ch->number,
ch->delayed_IPI_flags);
spin_unlock(&part->IPI_lock);
spin_lock(&part->chctl_lock);
part->chctl.flags[ch->number] |=
ch->delayed_chctl_flags;
spin_unlock(&part->chctl_lock);
wakeup_channel_mgr = 1;
}
ch->delayed_IPI_flags = 0;
ch->delayed_chctl_flags = 0;
}
ch->flags &= ~XPC_C_WDISCONNECT;

297
drivers/misc/sgi-xp/xpc_sn2.c
View File

@ -104,20 +104,20 @@ xpc_disallow_IPI_ops_sn2(void)
}
/*
* 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).
* The following set of functions are used for the sending and receiving of
* IRQs (also known as IPIs). There are two flavors of IRQs, 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)
xpc_receive_IRQ_amo_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)
xpc_send_IRQ_sn2(AMO_t *amo, u64 flag, int nasid, int phys_cpuid, int vector)
{
int ret = 0;
unsigned long irq_flags;
@ -131,7 +131,7 @@ xpc_IPI_send_sn2(AMO_t *amo, u64 flag, int nasid, int phys_cpuid, int vector)
* 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.
* keep sending IRQs 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));
@ -142,16 +142,16 @@ xpc_IPI_send_sn2(AMO_t *amo, u64 flag, int nasid, int phys_cpuid, int vector)
}
static AMO_t *
xpc_IPI_init_sn2(int index)
xpc_init_IRQ_amo_sn2(int index)
{
AMO_t *amo = xpc_vars->amos_page + index;
(void)xpc_IPI_receive_sn2(amo); /* clear AMO variable */
(void)xpc_receive_IRQ_amo_sn2(amo); /* clear AMO variable */
return amo;
}
/*
* IPIs associated with SGI_XPC_ACTIVATE IRQ.
* Functions associated with SGI_XPC_ACTIVATE IRQ.
*/
/*
@ -166,10 +166,10 @@ xpc_handle_activate_IRQ_sn2(int irq, void *dev_id)
}
/*
* Flag the appropriate AMO variable and send an IPI to the specified node.
* Flag the appropriate AMO variable and send an IRQ to the specified node.
*/
static void
xpc_activate_IRQ_send_sn2(u64 amos_page_pa, int from_nasid, int to_nasid,
xpc_send_activate_IRQ_sn2(u64 amos_page_pa, int from_nasid, int to_nasid,
int to_phys_cpuid)
{
int w_index = XPC_NASID_W_INDEX(from_nasid);
@ -177,12 +177,12 @@ xpc_activate_IRQ_send_sn2(u64 amos_page_pa, int from_nasid, int to_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,
(void)xpc_send_IRQ_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)
xpc_send_local_activate_IRQ_sn2(int from_nasid)
{
int w_index = XPC_NASID_W_INDEX(from_nasid);
int b_index = XPC_NASID_B_INDEX(from_nasid);
@ -197,29 +197,29 @@ xpc_activate_IRQ_send_local_sn2(int from_nasid)
}
/*
* IPIs associated with SGI_XPC_NOTIFY IRQ.
* Functions associated with SGI_XPC_NOTIFY IRQ.
*/
/*
* Check to see if there is any channel activity to/from the specified
* partition.
* Check to see if any chctl flags were sent from the specified partition.
*/
static void
xpc_check_for_channel_activity_sn2(struct xpc_partition *part)
xpc_check_for_sent_chctl_flags_sn2(struct xpc_partition *part)
{
u64 IPI_amo;
union xpc_channel_ctl_flags chctl;
unsigned long irq_flags;
IPI_amo = xpc_IPI_receive_sn2(part->sn.sn2.local_IPI_amo_va);
if (IPI_amo == 0)
chctl.all_flags = xpc_receive_IRQ_amo_sn2(part->sn.sn2.
local_chctl_amo_va);
if (chctl.all_flags == 0)
return;
spin_lock_irqsave(&part->IPI_lock, irq_flags);
part->local_IPI_amo |= IPI_amo;
spin_unlock_irqrestore(&part->IPI_lock, irq_flags);
spin_lock_irqsave(&part->chctl_lock, irq_flags);
part->chctl.all_flags |= chctl.all_flags;
spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
dev_dbg(xpc_chan, "received IPI from partid=%d, IPI_amo=0x%lx\n",
XPC_PARTID(part), IPI_amo);
dev_dbg(xpc_chan, "received notify IRQ from partid=%d, chctl.all_flags="
"0x%lx\n", XPC_PARTID(part), chctl.all_flags);
xpc_wakeup_channel_mgr(part);
}
@ -228,17 +228,17 @@ xpc_check_for_channel_activity_sn2(struct xpc_partition *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
* than one partition, we use an AMO_t structure per partition to indicate
* whether a partition has sent an IPI or not. If it has, then wake up the
* whether a partition has sent an IRQ or not. If it has, then wake up the
* associated kthread to handle it.
*
* All SGI_XPC_NOTIFY IRQs received by XPC are the result of IPIs sent by XPC
* All SGI_XPC_NOTIFY IRQs received by XPC are the result of IRQs sent by XPC
* running on other partitions.
*
* Noteworthy Arguments:
*
* irq - Interrupt ReQuest number. NOT USED.
*
* dev_id - partid of IPI's potential sender.
* dev_id - partid of IRQ's potential sender.
*/
static irqreturn_t
xpc_handle_notify_IRQ_sn2(int irq, void *dev_id)
@ -249,7 +249,7 @@ xpc_handle_notify_IRQ_sn2(int irq, void *dev_id)
DBUG_ON(partid < 0 || partid >= xp_max_npartitions);
if (xpc_part_ref(part)) {
xpc_check_for_channel_activity_sn2(part);
xpc_check_for_sent_chctl_flags_sn2(part);
xpc_part_deref(part);
}
@ -257,45 +257,47 @@ xpc_handle_notify_IRQ_sn2(int irq, void *dev_id)
}
/*
* Check to see if xpc_handle_notify_IRQ_sn2() dropped any IPIs on the floor
* because the write to their associated IPI amo completed after the IRQ/IPI
* Check to see if xpc_handle_notify_IRQ_sn2() dropped any IRQs on the floor
* because the write to their associated amo variable completed after the IRQ
* was received.
*/
static void
xpc_dropped_notify_IRQ_check_sn2(struct xpc_partition *part)
xpc_check_for_dropped_notify_IRQ_sn2(struct xpc_partition *part)
{
struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2;
if (xpc_part_ref(part)) {
xpc_check_for_channel_activity_sn2(part);
xpc_check_for_sent_chctl_flags_sn2(part);
part_sn2->dropped_notify_IRQ_timer.expires = jiffies +
XPC_P_DROPPED_IPI_WAIT_INTERVAL;
XPC_DROPPED_NOTIFY_IRQ_WAIT_INTERVAL;
add_timer(&part_sn2->dropped_notify_IRQ_timer);
xpc_part_deref(part);
}
}
/*
* Send an IPI to the remote partition that is associated with the
* Send a notify IRQ 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)
xpc_send_notify_IRQ_sn2(struct xpc_channel *ch, u8 chctl_flag,
char *chctl_flag_string, unsigned long *irq_flags)
{
struct xpc_partition *part = &xpc_partitions[ch->partid];
struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2;
union xpc_channel_ctl_flags chctl = { 0 };
enum xp_retval ret;
if (likely(part->act_state != XPC_P_DEACTIVATING)) {
ret = xpc_IPI_send_sn2(part_sn2->remote_IPI_amo_va,
(u64)ipi_flag << (ch->number * 8),
part_sn2->remote_IPI_nasid,
part_sn2->remote_IPI_phys_cpuid,
chctl.flags[ch->number] = chctl_flag;
ret = xpc_send_IRQ_sn2(part_sn2->remote_chctl_amo_va,
chctl.all_flags,
part_sn2->notify_IRQ_nasid,
part_sn2->notify_IRQ_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);
chctl_flag_string, ch->partid, ch->number, ret);
if (unlikely(ret != xpSuccess)) {
if (irq_flags != NULL)
spin_unlock_irqrestore(&ch->lock, *irq_flags);
@ -306,78 +308,78 @@ xpc_notify_IRQ_send_sn2(struct xpc_channel *ch, u8 ipi_flag,
}
}
#define XPC_NOTIFY_IRQ_SEND_SN2(_ch, _ipi_f, _irq_f) \
xpc_notify_IRQ_send_sn2(_ch, _ipi_f, #_ipi_f, _irq_f)
#define XPC_SEND_NOTIFY_IRQ_SN2(_ch, _ipi_f, _irq_f) \
xpc_send_notify_IRQ_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_notify_IRQ_check_sn2().
* specified channel, sent us a notify IRQ. This faked IRQ will be handled
* by xpc_check_for_dropped_notify_IRQ_sn2().
*/
static void
xpc_notify_IRQ_send_local_sn2(struct xpc_channel *ch, u8 ipi_flag,
char *ipi_flag_string)
xpc_send_local_notify_IRQ_sn2(struct xpc_channel *ch, u8 chctl_flag,
char *chctl_flag_string)
{
struct xpc_partition *part = &xpc_partitions[ch->partid];
union xpc_channel_ctl_flags chctl = { 0 };
FETCHOP_STORE_OP(TO_AMO((u64)&part->sn.sn2.local_IPI_amo_va->variable),
FETCHOP_OR, ((u64)ipi_flag << (ch->number * 8)));
chctl.flags[ch->number] = chctl_flag;
FETCHOP_STORE_OP(TO_AMO((u64)&part->sn.sn2.local_chctl_amo_va->
variable), FETCHOP_OR, chctl.all_flags);
dev_dbg(xpc_chan, "%s sent local from partid=%d, channel=%d\n",
ipi_flag_string, ch->partid, ch->number);
chctl_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)
#define XPC_SEND_LOCAL_NOTIFY_IRQ_SN2(_ch, _ipi_f) \
xpc_send_local_notify_IRQ_sn2(_ch, _ipi_f, #_ipi_f)
static void
xpc_send_channel_closerequest_sn2(struct xpc_channel *ch,
xpc_send_chctl_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);
XPC_SEND_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_CLOSEREQUEST, irq_flags);
}
static void
xpc_send_channel_closereply_sn2(struct xpc_channel *ch,
unsigned long *irq_flags)
xpc_send_chctl_closereply_sn2(struct xpc_channel *ch, unsigned long *irq_flags)
{
XPC_NOTIFY_IRQ_SEND_SN2(ch, XPC_IPI_CLOSEREPLY, irq_flags);
XPC_SEND_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_CLOSEREPLY, irq_flags);
}
static void
xpc_send_channel_openrequest_sn2(struct xpc_channel *ch,
unsigned long *irq_flags)
xpc_send_chctl_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);
XPC_SEND_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_OPENREQUEST, irq_flags);
}
static void
xpc_send_channel_openreply_sn2(struct xpc_channel *ch, unsigned long *irq_flags)
xpc_send_chctl_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);
XPC_SEND_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_OPENREPLY, irq_flags);
}
static void
xpc_send_channel_msgrequest_sn2(struct xpc_channel *ch)
xpc_send_chctl_msgrequest_sn2(struct xpc_channel *ch)
{
XPC_NOTIFY_IRQ_SEND_SN2(ch, XPC_IPI_MSGREQUEST, NULL);
XPC_SEND_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_MSGREQUEST, NULL);
}
static void
xpc_send_channel_local_msgrequest_sn2(struct xpc_channel *ch)
xpc_send_chctl_local_msgrequest_sn2(struct xpc_channel *ch)
{
XPC_NOTIFY_IRQ_SEND_LOCAL_SN2(ch, XPC_IPI_MSGREQUEST);
XPC_SEND_LOCAL_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_MSGREQUEST);
}
/*
@ -402,7 +404,7 @@ xpc_indicate_partition_engaged_sn2(struct xpc_partition *part)
* 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.
* keep sending IRQs and AMOs to it until the heartbeat times out.
*/
(void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->
variable),
@ -429,7 +431,7 @@ xpc_indicate_partition_disengaged_sn2(struct xpc_partition *part)
* 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.
* keep sending IRQs and AMOs to it until the heartbeat times out.
*/
(void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->
variable),
@ -441,7 +443,7 @@ xpc_indicate_partition_disengaged_sn2(struct xpc_partition *part)
* Send activate IRQ to get other side to see that we've cleared our
* bit in their engaged partitions AMO.
*/
xpc_activate_IRQ_send_sn2(part_sn2->remote_amos_page_pa,
xpc_send_activate_IRQ_sn2(part_sn2->remote_amos_page_pa,
cnodeid_to_nasid(0),
part_sn2->activate_IRQ_nasid,
part_sn2->activate_IRQ_phys_cpuid);
@ -595,11 +597,11 @@ 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_sn2(XPC_ACTIVATE_IRQ_AMOS + i);
(void)xpc_init_IRQ_amo_sn2(XPC_ACTIVATE_IRQ_AMOS + i);
/* initialize the engaged remote partitions related AMO variables */
(void)xpc_IPI_init_sn2(XPC_ENGAGED_PARTITIONS_AMO);
(void)xpc_IPI_init_sn2(XPC_DEACTIVATE_REQUEST_AMO);
(void)xpc_init_IRQ_amo_sn2(XPC_ENGAGED_PARTITIONS_AMO);
(void)xpc_init_IRQ_amo_sn2(XPC_DEACTIVATE_REQUEST_AMO);
return xpSuccess;
}
@ -729,13 +731,13 @@ static void
xpc_request_partition_activation_sn2(struct xpc_rsvd_page *remote_rp,
u64 remote_rp_pa, int nasid)
{
xpc_activate_IRQ_send_local_sn2(nasid);
xpc_send_local_activate_IRQ_sn2(nasid);
}
static void
xpc_request_partition_reactivation_sn2(struct xpc_partition *part)
{
xpc_activate_IRQ_send_local_sn2(part->sn.sn2.activate_IRQ_nasid);
xpc_send_local_activate_IRQ_sn2(part->sn.sn2.activate_IRQ_nasid);
}
static void
@ -755,7 +757,7 @@ xpc_request_partition_deactivation_sn2(struct xpc_partition *part)
* 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.
* keep sending IRQs and AMOs to it until the heartbeat times out.
*/
(void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->
variable),
@ -767,7 +769,7 @@ xpc_request_partition_deactivation_sn2(struct xpc_partition *part)
* Send activate IRQ to get other side to see that we've set our
* bit in their deactivate request AMO.
*/
xpc_activate_IRQ_send_sn2(part_sn2->remote_amos_page_pa,
xpc_send_activate_IRQ_sn2(part_sn2->remote_amos_page_pa,
cnodeid_to_nasid(0),
part_sn2->activate_IRQ_nasid,
part_sn2->activate_IRQ_phys_cpuid);
@ -789,7 +791,7 @@ xpc_cancel_partition_deactivation_request_sn2(struct xpc_partition *part)
* 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.
* keep sending IRQs and AMOs to it until the heartbeat times out.
*/
(void)xp_nofault_PIOR((u64 *)GLOBAL_MMR_ADDR(NASID_GET(&amo->
variable),
@ -861,11 +863,11 @@ xpc_update_partition_info_sn2(struct xpc_partition *part, u8 remote_rp_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.
* Prior code has determined the nasid which generated a activate IRQ.
* Inspect that nasid to determine if its partition needs to be activated
* or deactivated.
*
* A partition is consider "awaiting activation" if our partition
* A partition is considered "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
@ -997,7 +999,7 @@ xpc_identify_activate_IRQ_sender_sn2(void)
if (xpc_exiting)
break;
nasid_mask = xpc_IPI_receive_sn2(&act_amos[word]);
nasid_mask = xpc_receive_IRQ_amo_sn2(&act_amos[word]);
if (nasid_mask == 0) {
/* no IRQs from nasids in this variable */
continue;
@ -1117,20 +1119,20 @@ xpc_setup_infrastructure_sn2(struct xpc_partition *part)
part_sn2->remote_openclose_args_pa = 0;
part_sn2->local_IPI_amo_va = xpc_IPI_init_sn2(partid);
part->local_IPI_amo = 0;
spin_lock_init(&part->IPI_lock);
part_sn2->local_chctl_amo_va = xpc_init_IRQ_amo_sn2(partid);
part->chctl.all_flags = 0;
spin_lock_init(&part->chctl_lock);
part_sn2->remote_IPI_nasid = 0;
part_sn2->remote_IPI_phys_cpuid = 0;
part_sn2->remote_IPI_amo_va = NULL;
part_sn2->notify_IRQ_nasid = 0;
part_sn2->notify_IRQ_phys_cpuid = 0;
part_sn2->remote_chctl_amo_va = NULL;
atomic_set(&part->channel_mgr_requests, 1);
init_waitqueue_head(&part->channel_mgr_wq);
sprintf(part_sn2->IPI_owner, "xpc%02d", partid);
sprintf(part_sn2->notify_IRQ_owner, "xpc%02d", partid);
ret = request_irq(SGI_XPC_NOTIFY, xpc_handle_notify_IRQ_sn2,
IRQF_SHARED, part_sn2->IPI_owner,
IRQF_SHARED, part_sn2->notify_IRQ_owner,
(void *)(u64)partid);
if (ret != 0) {
dev_err(xpc_chan, "can't register NOTIFY IRQ handler, "
@ -1139,13 +1141,13 @@ xpc_setup_infrastructure_sn2(struct xpc_partition *part)
goto out_5;
}
/* Setup a timer to check for dropped IPIs */
/* Setup a timer to check for dropped notify IRQs */
timer = &part_sn2->dropped_notify_IRQ_timer;
init_timer(timer);
timer->function =
(void (*)(unsigned long))xpc_dropped_notify_IRQ_check_sn2;
(void (*)(unsigned long))xpc_check_for_dropped_notify_IRQ_sn2;
timer->data = (unsigned long)part;
timer->expires = jiffies + XPC_P_DROPPED_IPI_WAIT_INTERVAL;
timer->expires = jiffies + XPC_DROPPED_NOTIFY_IRQ_WAIT_INTERVAL;
add_timer(timer);
part->nchannels = XPC_MAX_NCHANNELS;
@ -1196,10 +1198,10 @@ xpc_setup_infrastructure_sn2(struct xpc_partition *part)
xpc_vars_part[partid].GPs_pa = __pa(part_sn2->local_GPs);
xpc_vars_part[partid].openclose_args_pa =
__pa(part->local_openclose_args);
xpc_vars_part[partid].IPI_amo_pa = __pa(part_sn2->local_IPI_amo_va);
xpc_vars_part[partid].chctl_amo_pa = __pa(part_sn2->local_chctl_amo_va);
cpuid = raw_smp_processor_id(); /* any CPU in this partition will do */
xpc_vars_part[partid].IPI_nasid = cpuid_to_nasid(cpuid);
xpc_vars_part[partid].IPI_phys_cpuid = cpu_physical_id(cpuid);
xpc_vars_part[partid].notify_IRQ_nasid = cpuid_to_nasid(cpuid);
xpc_vars_part[partid].notify_IRQ_phys_cpuid = cpu_physical_id(cpuid);
xpc_vars_part[partid].nchannels = part->nchannels;
xpc_vars_part[partid].magic = XPC_VP_MAGIC1;
@ -1239,7 +1241,7 @@ xpc_teardown_infrastructure_sn2(struct xpc_partition *part)
* processes by marking it as no longer setup. Then we make it
* inaccessible to remote processes by clearing the XPC per partition
* specific variable's magic # (which indicates that these variables
* are no longer valid) and by ignoring all XPC notify IPIs sent to
* are no longer valid) and by ignoring all XPC notify IRQs sent to
* this partition.
*/
@ -1275,7 +1277,7 @@ xpc_teardown_infrastructure_sn2(struct xpc_partition *part)
part_sn2->local_GPs = NULL;
kfree(part->channels);
part->channels = NULL;
part_sn2->local_IPI_amo_va = NULL;
part_sn2->local_chctl_amo_va = NULL;
}
/*
@ -1370,7 +1372,7 @@ xpc_pull_remote_vars_part_sn2(struct xpc_partition *part)
if (pulled_entry->GPs_pa == 0 ||
pulled_entry->openclose_args_pa == 0 ||
pulled_entry->IPI_amo_pa == 0) {
pulled_entry->chctl_amo_pa == 0) {
dev_err(xpc_chan, "partition %d's XPC vars_part for "
"partition %d are not valid\n", partid,
@ -1383,10 +1385,11 @@ xpc_pull_remote_vars_part_sn2(struct xpc_partition *part)
part_sn2->remote_GPs_pa = pulled_entry->GPs_pa;
part_sn2->remote_openclose_args_pa =
pulled_entry->openclose_args_pa;
part_sn2->remote_IPI_amo_va =
(AMO_t *)__va(pulled_entry->IPI_amo_pa);
part_sn2->remote_IPI_nasid = pulled_entry->IPI_nasid;
part_sn2->remote_IPI_phys_cpuid = pulled_entry->IPI_phys_cpuid;
part_sn2->remote_chctl_amo_va =
(AMO_t *)__va(pulled_entry->chctl_amo_pa);
part_sn2->notify_IRQ_nasid = pulled_entry->notify_IRQ_nasid;
part_sn2->notify_IRQ_phys_cpuid =
pulled_entry->notify_IRQ_phys_cpuid;
if (part->nchannels > pulled_entry->nchannels)
part->nchannels = pulled_entry->nchannels;
@ -1437,7 +1440,7 @@ xpc_make_first_contact_sn2(struct xpc_partition *part)
* Send activate IRQ to get other side to activate if they've not
* already begun to do so.
*/
xpc_activate_IRQ_send_sn2(part_sn2->remote_amos_page_pa,
xpc_send_activate_IRQ_sn2(part_sn2->remote_amos_page_pa,
cnodeid_to_nasid(0),
part_sn2->activate_IRQ_nasid,
part_sn2->activate_IRQ_phys_cpuid);
@ -1462,28 +1465,28 @@ xpc_make_first_contact_sn2(struct xpc_partition *part)
}
/*
* Get the IPI flags and pull the openclose args and/or remote GPs as needed.
* Get the chctl flags and pull the openclose args and/or remote GPs as needed.
*/
static u64
xpc_get_IPI_flags_sn2(struct xpc_partition *part)
xpc_get_chctl_all_flags_sn2(struct xpc_partition *part)
{
struct xpc_partition_sn2 *part_sn2 = &part->sn.sn2;
unsigned long irq_flags;
u64 IPI_amo;
union xpc_channel_ctl_flags chctl;
enum xp_retval ret;
/*
* See if there are any IPI flags to be handled.
* See if there are any chctl flags to be handled.
*/
spin_lock_irqsave(&part->IPI_lock, irq_flags);
IPI_amo = part->local_IPI_amo;
if (IPI_amo != 0)
part->local_IPI_amo = 0;
spin_lock_irqsave(&part->chctl_lock, irq_flags);
chctl = part->chctl;
if (chctl.all_flags != 0)
part->chctl.all_flags = 0;
spin_unlock_irqrestore(&part->IPI_lock, irq_flags);
spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
if (XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(IPI_amo)) {
if (xpc_any_openclose_chctl_flags_set(&chctl)) {
ret = xpc_pull_remote_cachelines_sn2(part, part->
remote_openclose_args,
(void *)part_sn2->
@ -1496,12 +1499,12 @@ xpc_get_IPI_flags_sn2(struct xpc_partition *part)
"partition %d, ret=%d\n", XPC_PARTID(part),
ret);
/* don't bother processing IPIs anymore */
IPI_amo = 0;
/* don't bother processing chctl flags anymore */
chctl.all_flags = 0;
}
}
if (XPC_ANY_MSG_IPI_FLAGS_SET(IPI_amo)) {
if (xpc_any_msg_chctl_flags_set(&chctl)) {
ret = xpc_pull_remote_cachelines_sn2(part, part_sn2->remote_GPs,
(void *)part_sn2->remote_GPs_pa,
XPC_GP_SIZE);
@ -1511,12 +1514,12 @@ xpc_get_IPI_flags_sn2(struct xpc_partition *part)
dev_dbg(xpc_chan, "failed to pull GPs from partition "
"%d, ret=%d\n", XPC_PARTID(part), ret);
/* don't bother processing IPIs anymore */
IPI_amo = 0;
/* don't bother processing chctl flags anymore */
chctl.all_flags = 0;
}
}
return IPI_amo;
return chctl.all_flags;
}
/*
@ -1610,7 +1613,7 @@ xpc_clear_remote_msgqueue_flags_sn2(struct xpc_channel *ch)
}
static void
xpc_process_msg_IPI_sn2(struct xpc_partition *part, int ch_number)
xpc_process_msg_chctl_flags_sn2(struct xpc_partition *part, int ch_number)
{
struct xpc_channel *ch = &part->channels[ch_number];
struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2;
@ -1827,8 +1830,8 @@ xpc_get_deliverable_msg_sn2(struct xpc_channel *ch)
/*
* 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.
* the local message queue's Put value and then send a chctl msgrequest to the
* recipient partition.
*/
static void
xpc_send_msgs_sn2(struct xpc_channel *ch, s64 initial_put)
@ -1836,7 +1839,7 @@ xpc_send_msgs_sn2(struct xpc_channel *ch, s64 initial_put)
struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2;
struct xpc_msg *msg;
s64 put = initial_put + 1;
int send_IPI = 0;
int send_msgrequest = 0;
while (1) {
@ -1871,7 +1874,7 @@ xpc_send_msgs_sn2(struct xpc_channel *ch, s64 initial_put)
dev_dbg(xpc_chan, "local_GP->put changed to %ld, partid=%d, "
"channel=%d\n", put, ch->partid, ch->number);
send_IPI = 1;
send_msgrequest = 1;
/*
* We need to ensure that the message referenced by
@ -1881,8 +1884,8 @@ xpc_send_msgs_sn2(struct xpc_channel *ch, s64 initial_put)
initial_put = put;
}
if (send_IPI)
xpc_send_channel_msgrequest_sn2(ch);
if (send_msgrequest)
xpc_send_chctl_msgrequest_sn2(ch);
}
/*
@ -1929,13 +1932,13 @@ xpc_allocate_msg_sn2(struct xpc_channel *ch, u32 flags,
* 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.
* we set a timeout in case the other side is not sending
* completion interrupts. This lets us fake a notify IRQ
* that will cause the notify IRQ handler to fetch the latest
* GP values as if an interrupt was sent by the other side.
*/
if (ret == xpTimeout)
xpc_send_channel_local_msgrequest_sn2(ch);
xpc_send_chctl_local_msgrequest_sn2(ch);
if (flags & XPC_NOWAIT)
return xpNoWait;
@ -1962,8 +1965,8 @@ xpc_allocate_msg_sn2(struct xpc_channel *ch, u32 flags,
/*
* 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.
* local message queue's Put value and sends a chctl msgrequest to the
* partition the message is being sent to.
*/
static enum xp_retval
xpc_send_msg_sn2(struct xpc_channel *ch, u32 flags, void *payload,
@ -2055,7 +2058,7 @@ out_1:
/*
* 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.
* send a chctl msgrequest to the message sender's partition.
*/
static void
xpc_acknowledge_msgs_sn2(struct xpc_channel *ch, s64 initial_get, u8 msg_flags)
@ -2063,7 +2066,7 @@ xpc_acknowledge_msgs_sn2(struct xpc_channel *ch, s64 initial_get, u8 msg_flags)
struct xpc_channel_sn2 *ch_sn2 = &ch->sn.sn2;
struct xpc_msg *msg;
s64 get = initial_get + 1;
int send_IPI = 0;
int send_msgrequest = 0;
while (1) {
@ -2099,7 +2102,7 @@ xpc_acknowledge_msgs_sn2(struct xpc_channel *ch, s64 initial_get, u8 msg_flags)
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);
send_msgrequest = (msg_flags & XPC_M_INTERRUPT);
/*
* We need to ensure that the message referenced by
@ -2109,8 +2112,8 @@ xpc_acknowledge_msgs_sn2(struct xpc_channel *ch, s64 initial_get, u8 msg_flags)
initial_get = get;
}
if (send_IPI)
xpc_send_channel_msgrequest_sn2(ch);
if (send_msgrequest)
xpc_send_chctl_msgrequest_sn2(ch);
}
static void
@ -2168,9 +2171,9 @@ xpc_init_sn2(void)
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_chctl_all_flags = xpc_get_chctl_all_flags_sn2;
xpc_notify_senders_of_disconnect = xpc_notify_senders_of_disconnect_sn2;
xpc_process_msg_IPI = xpc_process_msg_IPI_sn2;
xpc_process_msg_chctl_flags = xpc_process_msg_chctl_flags_sn2;
xpc_n_of_deliverable_msgs = xpc_n_of_deliverable_msgs_sn2;
xpc_get_deliverable_msg = xpc_get_deliverable_msg_sn2;
@ -2181,10 +2184,10 @@ xpc_init_sn2(void)
xpc_indicate_partition_disengaged_sn2;
xpc_assume_partition_disengaged = xpc_assume_partition_disengaged_sn2;
xpc_send_channel_closerequest = xpc_send_channel_closerequest_sn2;
xpc_send_channel_closereply = xpc_send_channel_closereply_sn2;
xpc_send_channel_openrequest = xpc_send_channel_openrequest_sn2;
xpc_send_channel_openreply = xpc_send_channel_openreply_sn2;
xpc_send_chctl_closerequest = xpc_send_chctl_closerequest_sn2;
xpc_send_chctl_closereply = xpc_send_chctl_closereply_sn2;
xpc_send_chctl_openrequest = xpc_send_chctl_openrequest_sn2;
xpc_send_chctl_openreply = xpc_send_chctl_openreply_sn2;
xpc_send_msg = xpc_send_msg_sn2;
xpc_received_msg = xpc_received_msg_sn2;

10
drivers/misc/sgi-xp/xpc_uv.c
View File

@ -26,7 +26,7 @@ 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)
xpc_send_local_activate_IRQ_uv(struct xpc_partition *part)
{
/*
* >>> make our side think that the remote parition sent an activate
@ -75,13 +75,13 @@ xpc_request_partition_activation_uv(struct xpc_rsvd_page *remote_rp,
* >>> part->sn.uv.activate_mq_gpa = remote_rp->sn.activate_mq_gpa;
*/
xpc_IPI_send_local_activate_uv(part);
xpc_send_local_activate_IRQ_uv(part);
}
static void
xpc_request_partition_reactivation_uv(struct xpc_partition *part)
{
xpc_IPI_send_local_activate_uv(part);
xpc_send_local_activate_IRQ_uv(part);
}
/*
@ -114,7 +114,7 @@ xpc_make_first_contact_uv(struct xpc_partition *part)
}
static u64
xpc_get_IPI_flags_uv(struct xpc_partition *part)
xpc_get_chctl_all_flags_uv(struct xpc_partition *part)
{
/* >>> this function needs fleshing out */
return 0UL;
@ -140,7 +140,7 @@ xpc_init_uv(void)
xpc_setup_infrastructure = xpc_setup_infrastructure_uv;
xpc_teardown_infrastructure = xpc_teardown_infrastructure_uv;
xpc_make_first_contact = xpc_make_first_contact_uv;
xpc_get_IPI_flags = xpc_get_IPI_flags_uv;
xpc_get_chctl_all_flags = xpc_get_chctl_all_flags_uv;
xpc_get_deliverable_msg = xpc_get_deliverable_msg_uv;
}