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sgi-xpc: implement opencomplete messaging

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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>
This commit is contained in:
Robin Holt
2009-04-13 14:40:19 -07:00
committed by Linus Torvalds
parent a374c57b07
commit efdd06ed18
5 changed files with 124 additions and 61 deletions
Download Patch File Download Diff File Expand all files Collapse all files

56
drivers/misc/sgi-xp/xpc.h
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@@ -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);