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authorRobin Holt <holt@sgi.com>2009-04-13 14:40:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-13 15:04:33 -0700
commitefdd06ed181a88a11e612238c1ac04668e665395 (patch)
tree6d66f74c82edf9986eeab5b3edef4697d5b6bb5c
parenta374c57b0764432a80303abee3d1afd1939b5a0a (diff)
sgi-xpc: implement opencomplete messaging
sgi-xpc has a window of failure where an open message can be sent and a subsequent data message can get lost. We have added a new message (opencomplete) which closes that window. Signed-off-by: Robin Holt <holt@sgi.com> 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>
-rw-r--r--drivers/misc/sgi-xp/xpc.h56
-rw-r--r--drivers/misc/sgi-xp/xpc_channel.c97
-rw-r--r--drivers/misc/sgi-xp/xpc_main.c2
-rw-r--r--drivers/misc/sgi-xp/xpc_sn2.c8
-rw-r--r--drivers/misc/sgi-xp/xpc_uv.c22
5 files changed, 124 insertions, 61 deletions
diff --git a/drivers/misc/sgi-xp/xpc.h b/drivers/misc/sgi-xp/xpc.h
index da32bbe8caa..a5404767478 100644
--- a/drivers/misc/sgi-xp/xpc.h
+++ b/drivers/misc/sgi-xp/xpc.h
@@ -232,9 +232,10 @@ struct xpc_activate_mq_msghdr_uv {
#define XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV 4
#define XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV 5
#define XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV 6
+#define XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV 7
-#define XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV 7
-#define XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV 8
+#define XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV 8
+#define XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV 9
struct xpc_activate_mq_msg_uv {
struct xpc_activate_mq_msghdr_uv hdr;
@@ -278,6 +279,11 @@ struct xpc_activate_mq_msg_chctl_openreply_uv {
unsigned long notify_gru_mq_desc_gpa;
};
+struct xpc_activate_mq_msg_chctl_opencomplete_uv {
+ struct xpc_activate_mq_msghdr_uv hdr;
+ short ch_number;
+};
+
/*
* Functions registered by add_timer() or called by kernel_thread() only
* allow for a single 64-bit argument. The following macros can be used to
@@ -583,30 +589,32 @@ struct xpc_channel {
#define XPC_C_WASCONNECTED 0x00000001 /* channel was connected */
-#define XPC_C_ROPENREPLY 0x00000002 /* remote open channel reply */
-#define XPC_C_OPENREPLY 0x00000004 /* local open channel reply */
-#define XPC_C_ROPENREQUEST 0x00000008 /* remote open channel request */
-#define XPC_C_OPENREQUEST 0x00000010 /* local open channel request */
+#define XPC_C_ROPENCOMPLETE 0x00000002 /* remote open channel complete */
+#define XPC_C_OPENCOMPLETE 0x00000004 /* local open channel complete */
+#define XPC_C_ROPENREPLY 0x00000008 /* remote open channel reply */
+#define XPC_C_OPENREPLY 0x00000010 /* local open channel reply */
+#define XPC_C_ROPENREQUEST 0x00000020 /* remote open channel request */
+#define XPC_C_OPENREQUEST 0x00000040 /* local open channel request */
-#define XPC_C_SETUP 0x00000020 /* channel's msgqueues are alloc'd */
-#define XPC_C_CONNECTEDCALLOUT 0x00000040 /* connected callout initiated */
+#define XPC_C_SETUP 0x00000080 /* channel's msgqueues are alloc'd */
+#define XPC_C_CONNECTEDCALLOUT 0x00000100 /* connected callout initiated */
#define XPC_C_CONNECTEDCALLOUT_MADE \
- 0x00000080 /* connected callout completed */
-#define XPC_C_CONNECTED 0x00000100 /* local channel is connected */
-#define XPC_C_CONNECTING 0x00000200 /* channel is being connected */
+ 0x00000200 /* connected callout completed */
+#define XPC_C_CONNECTED 0x00000400 /* local channel is connected */
+#define XPC_C_CONNECTING 0x00000800 /* channel is being connected */
-#define XPC_C_RCLOSEREPLY 0x00000400 /* remote close channel reply */
-#define XPC_C_CLOSEREPLY 0x00000800 /* local close channel reply */
-#define XPC_C_RCLOSEREQUEST 0x00001000 /* remote close channel request */
-#define XPC_C_CLOSEREQUEST 0x00002000 /* local close channel request */
+#define XPC_C_RCLOSEREPLY 0x00001000 /* remote close channel reply */
+#define XPC_C_CLOSEREPLY 0x00002000 /* local close channel reply */
+#define XPC_C_RCLOSEREQUEST 0x00004000 /* remote close channel request */
+#define XPC_C_CLOSEREQUEST 0x00008000 /* local close channel request */
-#define XPC_C_DISCONNECTED 0x00004000 /* channel is disconnected */
-#define XPC_C_DISCONNECTING 0x00008000 /* channel is being disconnected */
+#define XPC_C_DISCONNECTED 0x00010000 /* channel is disconnected */
+#define XPC_C_DISCONNECTING 0x00020000 /* channel is being disconnected */
#define XPC_C_DISCONNECTINGCALLOUT \
- 0x00010000 /* disconnecting callout initiated */
+ 0x00040000 /* disconnecting callout initiated */
#define XPC_C_DISCONNECTINGCALLOUT_MADE \
- 0x00020000 /* disconnecting callout completed */
-#define XPC_C_WDISCONNECT 0x00040000 /* waiting for channel disconnect */
+ 0x00080000 /* disconnecting callout completed */
+#define XPC_C_WDISCONNECT 0x00100000 /* waiting for channel disconnect */
/*
* The channel control flags (chctl) union consists of a 64-bit variable which
@@ -625,11 +633,13 @@ union xpc_channel_ctl_flags {
#define XPC_CHCTL_CLOSEREPLY 0x02
#define XPC_CHCTL_OPENREQUEST 0x04
#define XPC_CHCTL_OPENREPLY 0x08
-#define XPC_CHCTL_MSGREQUEST 0x10
+#define XPC_CHCTL_OPENCOMPLETE 0x10
+#define XPC_CHCTL_MSGREQUEST 0x20
#define XPC_OPENCLOSE_CHCTL_FLAGS \
(XPC_CHCTL_CLOSEREQUEST | XPC_CHCTL_CLOSEREPLY | \
- XPC_CHCTL_OPENREQUEST | XPC_CHCTL_OPENREPLY)
+ XPC_CHCTL_OPENREQUEST | XPC_CHCTL_OPENREPLY | \
+ XPC_CHCTL_OPENCOMPLETE)
#define XPC_MSG_CHCTL_FLAGS XPC_CHCTL_MSGREQUEST
static inline int
@@ -866,6 +876,8 @@ extern void (*xpc_send_chctl_closereply) (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 void (*xpc_send_chctl_opencomplete) (struct xpc_channel *,
+ unsigned long *);
extern enum xp_retval (*xpc_save_remote_msgqueue_pa) (struct xpc_channel *,
unsigned long);
diff --git a/drivers/misc/sgi-xp/xpc_channel.c b/drivers/misc/sgi-xp/xpc_channel.c
index 99a2534c38a..2eb3abff0e3 100644
--- a/drivers/misc/sgi-xp/xpc_channel.c
+++ b/drivers/misc/sgi-xp/xpc_channel.c
@@ -3,7 +3,7 @@
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
- * Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (c) 2004-2009 Silicon Graphics, Inc. All Rights Reserved.
*/
/*
@@ -44,10 +44,10 @@ xpc_process_connect(struct xpc_channel *ch, unsigned long *irq_flags)
if (ret != xpSuccess)
XPC_DISCONNECT_CHANNEL(ch, ret, irq_flags);
+ else
+ ch->flags |= XPC_C_SETUP;
- ch->flags |= XPC_C_SETUP;
-
- if (ch->flags & (XPC_C_CONNECTED | XPC_C_DISCONNECTING))
+ if (ch->flags & XPC_C_DISCONNECTING)
return;
}
@@ -59,14 +59,18 @@ xpc_process_connect(struct xpc_channel *ch, unsigned long *irq_flags)
if (!(ch->flags & XPC_C_ROPENREPLY))
return;
- ch->flags = (XPC_C_CONNECTED | XPC_C_SETUP); /* clear all else */
+ if (!(ch->flags & XPC_C_OPENCOMPLETE)) {
+ ch->flags |= (XPC_C_OPENCOMPLETE | XPC_C_CONNECTED);
+ xpc_send_chctl_opencomplete(ch, irq_flags);
+ }
+
+ if (!(ch->flags & XPC_C_ROPENCOMPLETE))
+ return;
dev_info(xpc_chan, "channel %d to partition %d connected\n",
ch->number, ch->partid);
- spin_unlock_irqrestore(&ch->lock, *irq_flags);
- xpc_create_kthreads(ch, 1, 0);
- spin_lock_irqsave(&ch->lock, *irq_flags);
+ ch->flags = (XPC_C_CONNECTED | XPC_C_SETUP); /* clear all else */
}
/*
@@ -184,6 +188,7 @@ xpc_process_openclose_chctl_flags(struct xpc_partition *part, int ch_number,
struct xpc_channel *ch = &part->channels[ch_number];
enum xp_retval reason;
enum xp_retval ret;
+ int create_kthread = 0;
spin_lock_irqsave(&ch->lock, irq_flags);
@@ -196,8 +201,7 @@ again:
* has had a chance to see that the channel is disconnected.
*/
ch->delayed_chctl_flags |= chctl_flags;
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
+ goto out;
}
if (chctl_flags & XPC_CHCTL_CLOSEREQUEST) {
@@ -239,8 +243,7 @@ again:
XPC_CHCTL_CLOSEREQUEST;
spin_unlock(&part->chctl_lock);
}
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
+ goto out;
}
XPC_SET_REASON(ch, 0, 0);
@@ -250,7 +253,8 @@ again:
ch->flags |= (XPC_C_CONNECTING | XPC_C_ROPENREQUEST);
}
- chctl_flags &= ~(XPC_CHCTL_OPENREQUEST | XPC_CHCTL_OPENREPLY);
+ chctl_flags &= ~(XPC_CHCTL_OPENREQUEST | XPC_CHCTL_OPENREPLY |
+ XPC_CHCTL_OPENCOMPLETE);
/*
* The meaningful CLOSEREQUEST connection state fields are:
@@ -269,8 +273,7 @@ again:
XPC_DISCONNECT_CHANNEL(ch, reason, &irq_flags);
DBUG_ON(chctl_flags & XPC_CHCTL_CLOSEREPLY);
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
+ goto out;
}
xpc_process_disconnect(ch, &irq_flags);
@@ -283,8 +286,7 @@ again:
if (ch->flags & XPC_C_DISCONNECTED) {
DBUG_ON(part->act_state != XPC_P_AS_DEACTIVATING);
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
+ goto out;
}
DBUG_ON(!(ch->flags & XPC_C_CLOSEREQUEST));
@@ -299,8 +301,7 @@ again:
XPC_CHCTL_CLOSEREPLY;
spin_unlock(&part->chctl_lock);
}
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
+ goto out;
}
ch->flags |= XPC_C_RCLOSEREPLY;
@@ -320,14 +321,12 @@ again:
if (part->act_state == XPC_P_AS_DEACTIVATING ||
(ch->flags & XPC_C_ROPENREQUEST)) {
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
+ goto out;
}
if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_WDISCONNECT)) {
ch->delayed_chctl_flags |= XPC_CHCTL_OPENREQUEST;
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
+ goto out;
}
DBUG_ON(!(ch->flags & (XPC_C_DISCONNECTED |
XPC_C_OPENREQUEST)));
@@ -341,8 +340,7 @@ again:
*/
if (args->entry_size == 0 || args->local_nentries == 0) {
/* assume OPENREQUEST was delayed by mistake */
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
+ goto out;
}
ch->flags |= (XPC_C_ROPENREQUEST | XPC_C_CONNECTING);
@@ -352,8 +350,7 @@ again:
if (args->entry_size != ch->entry_size) {
XPC_DISCONNECT_CHANNEL(ch, xpUnequalMsgSizes,
&irq_flags);
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
+ goto out;
}
} else {
ch->entry_size = args->entry_size;
@@ -375,15 +372,13 @@ again:
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);
- return;
- }
+ if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_DISCONNECTED))
+ goto out;
+
if (!(ch->flags & XPC_C_OPENREQUEST)) {
XPC_DISCONNECT_CHANNEL(ch, xpOpenCloseError,
&irq_flags);
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
+ goto out;
}
DBUG_ON(!(ch->flags & XPC_C_ROPENREQUEST));
@@ -403,8 +398,7 @@ again:
ret = xpc_save_remote_msgqueue_pa(ch, args->local_msgqueue_pa);
if (ret != xpSuccess) {
XPC_DISCONNECT_CHANNEL(ch, ret, &irq_flags);
- spin_unlock_irqrestore(&ch->lock, irq_flags);
- return;
+ goto out;
}
ch->flags |= XPC_C_ROPENREPLY;
@@ -430,7 +424,36 @@ again:
xpc_process_connect(ch, &irq_flags);
}
+ if (chctl_flags & XPC_CHCTL_OPENCOMPLETE) {
+
+ dev_dbg(xpc_chan, "XPC_CHCTL_OPENCOMPLETE received from "
+ "partid=%d, channel=%d\n", ch->partid, ch->number);
+
+ if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_DISCONNECTED))
+ goto out;
+
+ if (!(ch->flags & XPC_C_OPENREQUEST) ||
+ !(ch->flags & XPC_C_OPENREPLY)) {
+ XPC_DISCONNECT_CHANNEL(ch, xpOpenCloseError,
+ &irq_flags);
+ goto out;
+ }
+
+ DBUG_ON(!(ch->flags & XPC_C_ROPENREQUEST));
+ DBUG_ON(!(ch->flags & XPC_C_ROPENREPLY));
+ DBUG_ON(!(ch->flags & XPC_C_CONNECTED));
+
+ ch->flags |= XPC_C_ROPENCOMPLETE;
+
+ xpc_process_connect(ch, &irq_flags);
+ create_kthread = 1;
+ }
+
+out:
spin_unlock_irqrestore(&ch->lock, irq_flags);
+
+ if (create_kthread)
+ xpc_create_kthreads(ch, 1, 0);
}
/*
@@ -564,10 +587,6 @@ xpc_process_sent_chctl_flags(struct xpc_partition *part)
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);
- xpc_process_connect(ch, &irq_flags);
- spin_unlock_irqrestore(&ch->lock, irq_flags);
}
continue;
}
diff --git a/drivers/misc/sgi-xp/xpc_main.c b/drivers/misc/sgi-xp/xpc_main.c
index 34b084cd63d..2bb070e1722 100644
--- a/drivers/misc/sgi-xp/xpc_main.c
+++ b/drivers/misc/sgi-xp/xpc_main.c
@@ -220,6 +220,8 @@ void (*xpc_send_chctl_openrequest) (struct xpc_channel *ch,
unsigned long *irq_flags);
void (*xpc_send_chctl_openreply) (struct xpc_channel *ch,
unsigned long *irq_flags);
+void (*xpc_send_chctl_opencomplete) (struct xpc_channel *ch,
+ unsigned long *irq_flags);
enum xp_retval (*xpc_save_remote_msgqueue_pa) (struct xpc_channel *ch,
unsigned long msgqueue_pa);
diff --git a/drivers/misc/sgi-xp/xpc_sn2.c b/drivers/misc/sgi-xp/xpc_sn2.c
index 43ad2968daf..09bc1989f21 100644
--- a/drivers/misc/sgi-xp/xpc_sn2.c
+++ b/drivers/misc/sgi-xp/xpc_sn2.c
@@ -431,6 +431,13 @@ xpc_send_chctl_openreply_sn2(struct xpc_channel *ch, unsigned long *irq_flags)
}
static void
+xpc_send_chctl_opencomplete_sn2(struct xpc_channel *ch,
+ unsigned long *irq_flags)
+{
+ XPC_SEND_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_OPENCOMPLETE, irq_flags);
+}
+
+static void
xpc_send_chctl_msgrequest_sn2(struct xpc_channel *ch)
{
XPC_SEND_NOTIFY_IRQ_SN2(ch, XPC_CHCTL_MSGREQUEST, NULL);
@@ -2380,6 +2387,7 @@ xpc_init_sn2(void)
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_chctl_opencomplete = xpc_send_chctl_opencomplete_sn2;
xpc_save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_sn2;
diff --git a/drivers/misc/sgi-xp/xpc_uv.c b/drivers/misc/sgi-xp/xpc_uv.c
index 97f7cb21a0a..1e475b4c088 100644
--- a/drivers/misc/sgi-xp/xpc_uv.c
+++ b/drivers/misc/sgi-xp/xpc_uv.c
@@ -534,6 +534,17 @@ xpc_handle_activate_mq_msg_uv(struct xpc_partition *part,
xpc_wakeup_channel_mgr(part);
break;
}
+ case XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV: {
+ struct xpc_activate_mq_msg_chctl_opencomplete_uv *msg;
+
+ msg = container_of(msg_hdr, struct
+ xpc_activate_mq_msg_chctl_opencomplete_uv, hdr);
+ spin_lock_irqsave(&part->chctl_lock, irq_flags);
+ part->chctl.flags[msg->ch_number] |= XPC_CHCTL_OPENCOMPLETE;
+ spin_unlock_irqrestore(&part->chctl_lock, irq_flags);
+
+ xpc_wakeup_channel_mgr(part);
+ }
case XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV:
spin_lock_irqsave(&part_uv->flags_lock, irq_flags);
part_uv->flags |= XPC_P_ENGAGED_UV;
@@ -1202,6 +1213,16 @@ xpc_send_chctl_openreply_uv(struct xpc_channel *ch, unsigned long *irq_flags)
}
static void
+xpc_send_chctl_opencomplete_uv(struct xpc_channel *ch, unsigned long *irq_flags)
+{
+ struct xpc_activate_mq_msg_chctl_opencomplete_uv msg;
+
+ msg.ch_number = ch->number;
+ xpc_send_activate_IRQ_ch_uv(ch, irq_flags, &msg, sizeof(msg),
+ XPC_ACTIVATE_MQ_MSG_CHCTL_OPENCOMPLETE_UV);
+}
+
+static void
xpc_send_chctl_local_msgrequest_uv(struct xpc_partition *part, int ch_number)
{
unsigned long irq_flags;
@@ -1665,6 +1686,7 @@ xpc_init_uv(void)
xpc_send_chctl_closereply = xpc_send_chctl_closereply_uv;
xpc_send_chctl_openrequest = xpc_send_chctl_openrequest_uv;
xpc_send_chctl_openreply = xpc_send_chctl_openreply_uv;
+ xpc_send_chctl_opencomplete = xpc_send_chctl_opencomplete_uv;
xpc_save_remote_msgqueue_pa = xpc_save_remote_msgqueue_pa_uv;