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x86 mmiotrace: comment about user space ABI

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Signed-off-by: Pekka Paalanen <pq@iki.fi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Pekka Paalanen 2008-05-12 21:20:57 +02:00 committed by Thomas Gleixner
parent fe1ffafa80
commit 63ffa3e456
1 changed files with 5 additions and 1 deletions
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6
include/linux/mmiotrace.h
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@ -3,6 +3,10 @@
#include <asm/types.h> #include <asm/types.h>
/*
* If you change anything here, you must bump MMIO_VERSION.
* This is the relay data format for user space.
*/
#define MMIO_VERSION 0x04 #define MMIO_VERSION 0x04
/* mm_io_header.type */ /* mm_io_header.type */
@ -23,7 +27,7 @@ enum mm_io_opcode { /* payload type: */
}; };
struct mm_io_header { struct mm_io_header {
__u32 type; __u32 type; /* see MMIO_* macros above */
__u32 sec; /* timestamp */ __u32 sec; /* timestamp */
__u32 nsec; __u32 nsec;
__u32 pid; /* PID of the process, or 0 for kernel core */ __u32 pid; /* PID of the process, or 0 for kernel core */