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Commit f5ffe02e authored by Frederic Weisbecker's avatar Frederic Weisbecker Committed by Ingo Molnar
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perf: Add kernel side syscall events support for breakpoints 



Add the remaining necessary bits to support breakpoints created
through perf syscall.

We don't use the software counter interface as:

- We don't need to check against recursion, this is already done
  in hardware breakpoints arch level.

- We already know the perf event we are dealing with when the
  event is to be committed.

Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Prasad <prasad@linux.vnet.ibm.com>
LKML-Reference: <1258987355-8751-3-git-send-email-fweisbec@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent fdf6bc95

kernel/perf_event.c

+25 −9
Original line number Diff line number Diff line
@@ -3831,6 +3831,20 @@ static int perf_swevent_is_counting(struct perf_event *event) 
static int perf_tp_event_match(struct perf_event *event,

				struct perf_sample_data *data);



static int perf_exclude_event(struct perf_event *event,

			      struct pt_regs *regs)

{

	if (regs) {

		if (event->attr.exclude_user && user_mode(regs))

			return 1;



		if (event->attr.exclude_kernel && !user_mode(regs))

			return 1;

	}



	return 0;

}



static int perf_swevent_match(struct perf_event *event,

				enum perf_type_id type,

				u32 event_id,
@@ -3842,17 +3856,13 @@ static int perf_swevent_match(struct perf_event *event, 


	if (event->attr.type != type)

		return 0;



	if (event->attr.config != event_id)

		return 0;



	if (regs) {

		if (event->attr.exclude_user && user_mode(regs))

	if (perf_exclude_event(event, regs))

		return 0;



		if (event->attr.exclude_kernel && !user_mode(regs))

			return 0;

	}



	if (event->attr.type == PERF_TYPE_TRACEPOINT &&

	    !perf_tp_event_match(event, data))

		return 0;
@@ -4282,9 +4292,15 @@ static const struct pmu *bp_perf_event_init(struct perf_event *bp) 
	return &perf_ops_bp;

}



void perf_bp_event(struct perf_event *bp, void *regs)

void perf_bp_event(struct perf_event *bp, void *data)

{

	/* TODO */

	struct perf_sample_data sample;

	struct pt_regs *regs = data;



	sample.addr = bp->attr.bp_addr;



	if (!perf_exclude_event(bp, regs))

		perf_swevent_add(bp, 1, 1, &sample, regs);

}

#else

static void bp_perf_event_destroy(struct perf_event *event)