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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: Frederic 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: Ingo Molnar <mingo@elte.hu>
hifive-unleashed-5.1
Frederic Weisbecker 2009-11-23 15:42:34 +01:00 committed by Ingo Molnar
parent fdf6bc9522
commit f5ffe02e50
1 changed files with 25 additions and 9 deletions
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34
kernel/perf_event.c
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@ -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,
@ -3842,16 +3856,12 @@ 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))
return 0;
if (event->attr.exclude_kernel && !user_mode(regs))
return 0;
}
if (perf_exclude_event(event, regs))
return 0;
if (event->attr.type == PERF_TYPE_TRACEPOINT &&
!perf_tp_event_match(event, data))
@ -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)