perf: Don't use 4 bytes as a default instruction breakpoint length

4 bytes is fine as a default access for data breakpoints. But
instruction breakpoints should take the native pointer length,
otherwise we get a -EINVAL in x86-64.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Prasad <prasad@linux.vnet.ibm.com>
Cc: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Jason Wessel <jason.wessel@windriver.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 9bf0f402ca73..4af5bd59cfd1 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -602,8 +602,15 @@ parse_breakpoint_event(const char **strp, struct perf_event_attr *attr)
                         return EVT_FAILED;
         }
 
-        /* We should find a nice way to override the access type */
-        attr->bp_len = HW_BREAKPOINT_LEN_4;
+        /*
+         * We should find a nice way to override the access length
+         * Provide some defaults for now
+         */
+        if (attr->bp_type == HW_BREAKPOINT_X)
+                attr->bp_len = sizeof(long);
+        else
+                attr->bp_len = HW_BREAKPOINT_LEN_4;
+
         attr->type = PERF_TYPE_BREAKPOINT;
 
         return EVT_HANDLED;