diff options
Diffstat (limited to 'drivers/misc/sgi-xp/xp.h')
| -rw-r--r-- | drivers/misc/sgi-xp/xp.h | 45 |
1 files changed, 15 insertions, 30 deletions
diff --git a/drivers/misc/sgi-xp/xp.h b/drivers/misc/sgi-xp/xp.h index 9ac5758f4d0..859a5281c61 100644 --- a/drivers/misc/sgi-xp/xp.h +++ b/drivers/misc/sgi-xp/xp.h @@ -87,39 +87,18 @@ #endif /* - * The format of an XPC message is as follows: - * - * +-------+--------------------------------+ - * | flags |////////////////////////////////| - * +-------+--------------------------------+ - * | message # | - * +----------------------------------------+ - * | payload (user-defined message) | - * | | - * : - * | | - * +----------------------------------------+ - * - * The size of the payload is defined by the user via xpc_connect(). A user- - * defined message resides in the payload area. - * - * The size of a message entry (within a message queue) must be a cacheline - * sized multiple in order to facilitate the BTE transfer of messages from one - * message queue to another. A macro, XPC_MSG_SIZE(), is provided for the user + * Define macro, XPC_MSG_SIZE(), is provided for the user * that wants to fit as many msg entries as possible in a given memory size * (e.g. a memory page). */ -struct xpc_msg { - u8 flags; /* FOR XPC INTERNAL USE ONLY */ - u8 reserved[7]; /* FOR XPC INTERNAL USE ONLY */ - s64 number; /* FOR XPC INTERNAL USE ONLY */ - - u64 payload; /* user defined portion of message */ -}; +#define XPC_MSG_MAX_SIZE 128 +#define XPC_MSG_HDR_MAX_SIZE 16 +#define XPC_MSG_PAYLOAD_MAX_SIZE (XPC_MSG_MAX_SIZE - XPC_MSG_HDR_MAX_SIZE) -#define XPC_MSG_PAYLOAD_OFFSET (u64) (&((struct xpc_msg *)0)->payload) #define XPC_MSG_SIZE(_payload_size) \ - L1_CACHE_ALIGN(XPC_MSG_PAYLOAD_OFFSET + (_payload_size)) + ALIGN(XPC_MSG_HDR_MAX_SIZE + (_payload_size), \ + is_uv() ? 64 : 128) + /* * Define the return values and values passed to user's callout functions. @@ -210,7 +189,10 @@ enum xp_retval { xpGruCopyError, /* 58: gru_copy_gru() returned error */ xpGruSendMqError, /* 59: gru send message queue related error */ - xpUnknownReason /* 60: unknown reason - must be last in enum */ + xpBadChannelNumber, /* 60: invalid channel number */ + xpBadMsgType, /* 60: invalid message type */ + + xpUnknownReason /* 61: unknown reason - must be last in enum */ }; /* @@ -261,6 +243,9 @@ typedef void (*xpc_channel_func) (enum xp_retval reason, short partid, * calling xpc_received(). * * All other reason codes indicate failure. + * + * NOTE: The user defined function must be callable by an interrupt handler + * and thus cannot block. */ typedef void (*xpc_notify_func) (enum xp_retval reason, short partid, int ch_number, void *key); @@ -284,7 +269,7 @@ struct xpc_registration { xpc_channel_func func; /* function to call */ void *key; /* pointer to user's key */ u16 nentries; /* #of msg entries in local msg queue */ - u16 msg_size; /* message queue's message size */ + u16 entry_size; /* message queue's message entry size */ u32 assigned_limit; /* limit on #of assigned kthreads */ u32 idle_limit; /* limit on #of idle kthreads */ } ____cacheline_aligned; |