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-rw-r--r--tools/perf/Documentation/perf-record.txt16
-rw-r--r--tools/perf/util/parse-events.c84
2 files changed, 95 insertions, 5 deletions
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 0ff23de9e453..fc46c0b40f6e 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -26,11 +26,19 @@ OPTIONS
26 26
27-e:: 27-e::
28--event=:: 28--event=::
29 Select the PMU event. Selection can be a symbolic event name 29 Select the PMU event. Selection can be:
30 (use 'perf list' to list all events) or a raw PMU
31 event (eventsel+umask) in the form of rNNN where NNN is a
32 hexadecimal event descriptor.
33 30
31 - a symbolic event name (use 'perf list' to list all events)
32
33 - a raw PMU event (eventsel+umask) in the form of rNNN where NNN is a
34 hexadecimal event descriptor.
35
36 - a hardware breakpoint event in the form of '\mem:addr[:access]'
37 where addr is the address in memory you want to break in.
38 Access is the memory access type (read, write, execute) it can
39 be passed as follows: '\mem:addr[:[r][w][x]]'.
40 If you want to profile read-write accesses in 0x1000, just set
41 'mem:0x1000:rw'.
34-a:: 42-a::
35 System-wide collection. 43 System-wide collection.
36 44
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 0faf4f2bb5ca..070027469270 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1,4 +1,4 @@
1 1#include "../../../include/linux/hw_breakpoint.h"
2#include "util.h" 2#include "util.h"
3#include "../perf.h" 3#include "../perf.h"
4#include "parse-options.h" 4#include "parse-options.h"
@@ -540,6 +540,81 @@ static enum event_result parse_tracepoint_event(const char **strp,
540 attr, strp); 540 attr, strp);
541} 541}
542 542
543static enum event_result
544parse_breakpoint_type(const char *type, const char **strp,
545 struct perf_event_attr *attr)
546{
547 int i;
548
549 for (i = 0; i < 3; i++) {
550 if (!type[i])
551 break;
552
553 switch (type[i]) {
554 case 'r':
555 attr->bp_type |= HW_BREAKPOINT_R;
556 break;
557 case 'w':
558 attr->bp_type |= HW_BREAKPOINT_W;
559 break;
560 case 'x':
561 attr->bp_type |= HW_BREAKPOINT_X;
562 break;
563 default:
564 return EVT_FAILED;
565 }
566 }
567 if (!attr->bp_type) /* Default */
568 attr->bp_type = HW_BREAKPOINT_R | HW_BREAKPOINT_W;
569
570 *strp = type + i;
571
572 return EVT_HANDLED;
573}
574
575static enum event_result
576parse_breakpoint_event(const char **strp, struct perf_event_attr *attr)
577{
578 const char *target;
579 const char *type;
580 char *endaddr;
581 u64 addr;
582 enum event_result err;
583
584 target = strchr(*strp, ':');
585 if (!target)
586 return EVT_FAILED;
587
588 if (strncmp(*strp, "mem", target - *strp) != 0)
589 return EVT_FAILED;
590
591 target++;
592
593 addr = strtoull(target, &endaddr, 0);
594 if (target == endaddr)
595 return EVT_FAILED;
596
597 attr->bp_addr = addr;
598 *strp = endaddr;
599
600 type = strchr(target, ':');
601
602 /* If no type is defined, just rw as default */
603 if (!type) {
604 attr->bp_type = HW_BREAKPOINT_R | HW_BREAKPOINT_W;
605 } else {
606 err = parse_breakpoint_type(++type, strp, attr);
607 if (err == EVT_FAILED)
608 return EVT_FAILED;
609 }
610
611 /* We should find a nice way to override the access type */
612 attr->bp_len = HW_BREAKPOINT_LEN_4;
613 attr->type = PERF_TYPE_BREAKPOINT;
614
615 return EVT_HANDLED;
616}
617
543static int check_events(const char *str, unsigned int i) 618static int check_events(const char *str, unsigned int i)
544{ 619{
545 int n; 620 int n;
@@ -673,6 +748,10 @@ parse_event_symbols(const char **str, struct perf_event_attr *attr)
673 if (ret != EVT_FAILED) 748 if (ret != EVT_FAILED)
674 goto modifier; 749 goto modifier;
675 750
751 ret = parse_breakpoint_event(str, attr);
752 if (ret != EVT_FAILED)
753 goto modifier;
754
676 fprintf(stderr, "invalid or unsupported event: '%s'\n", *str); 755 fprintf(stderr, "invalid or unsupported event: '%s'\n", *str);
677 fprintf(stderr, "Run 'perf list' for a list of valid events\n"); 756 fprintf(stderr, "Run 'perf list' for a list of valid events\n");
678 return EVT_FAILED; 757 return EVT_FAILED;
@@ -859,6 +938,9 @@ void print_events(void)
859 "rNNN"); 938 "rNNN");
860 printf("\n"); 939 printf("\n");
861 940
941 printf(" %-42s [hardware breakpoint]\n", "mem:<addr>[:access]");
942 printf("\n");
943
862 print_tracepoint_events(); 944 print_tracepoint_events();
863 945
864 exit(129); 946 exit(129);