[PATCH v3 6/6] ARCv2: perf: Finally introduce HS perf unit

Alexey Brodkin
2015-08-24T14:21:00Z

From: Vineet Gupta <vgupta@synopsys.com>

With all features in place, the ARC HS pct block can now be effectively
allowed to be probed/used

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
---

No changes since v2.

Compared to v1:
[1] MAINTAINERS file updated to cover new file.

Documentation/devicetree/bindings/arc/archs-pct.txt | 17 +++++++++++++++++
MAINTAINERS | 2 +-
arch/arc/include/asm/perf_event.h | 5 ++++-
arch/arc/kernel/perf_event.c | 3 ++-
4 files changed, 24 insertions(+), 3 deletions(-)
create mode 100644 Documentation/devicetree/bindings/arc/archs-pct.txt

diff --git a/Documentation/devicetree/bindings/arc/archs-pct.txt b/Documentation/devicetree/bindings/arc/archs-pct.txt
new file mode 100644
index 0000000..1ae98b8
--- /dev/null
+++ b/Documentation/devicetree/bindings/arc/archs-pct.txt
@@ -0,0 +1,17 @@
+* ARC HS Performance Counters
+
+The ARC HS can be configured with a pipeline performance monitor for counting
+CPU and cache events like cache misses and hits. Like conventional PCT there
+are 100+ hardware conditions dynamically mapped to upto 32 counters.
+It also supports overflow interrupts.
+
+Required properties:
+
+- compatible : should contain
+ "snps,archs-pct"
+
+Example:
+
+pmu {
+ compatible = "snps,archs-pct";
+};
diff --git a/MAINTAINERS b/MAINTAINERS
index 569568f..3ab63b6 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9883,7 +9883,7 @@ SYNOPSYS ARC ARCHITECTURE
M: Vineet Gupta <vgupta@synopsys.com>
S: Supported
F: arch/arc/
-F: Documentation/devicetree/bindings/arc/
+F: Documentation/devicetree/bindings/arc/*
F: drivers/tty/serial/arc_uart.c

SYNOPSYS ARC SDP platform support
diff --git a/arch/arc/include/asm/perf_event.h b/arch/arc/include/asm/perf_event.h
index 876e216..848de94 100644
--- a/arch/arc/include/asm/perf_event.h
+++ b/arch/arc/include/asm/perf_event.h
@@ -105,8 +105,11 @@ static const char * const arc_pmu_ev_hw_map[] = {
[PERF_COUNT_HW_INSTRUCTIONS] = "iall",
[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = "ijmp",
[PERF_COUNT_ARC_BPOK] = "bpok", /* NP-NT, PT-T, PNT-NT */
+#ifdef CONFIG_ISA_ARCV2
+ [PERF_COUNT_HW_BRANCH_MISSES] = "bpmp",
+#else
[PERF_COUNT_HW_BRANCH_MISSES] = "bpfail", /* NP-T, PT-NT, PNT-T */
-
+#endif
[PERF_COUNT_ARC_LDC] = "imemrdc", /* Instr: mem read cached */
[PERF_COUNT_ARC_STC] = "imemwrc", /* Instr: mem write cached */

diff --git a/arch/arc/kernel/perf_event.c b/arch/arc/kernel/perf_event.c
index 80f5a85..19d6115 100644
--- a/arch/arc/kernel/perf_event.c
+++ b/arch/arc/kernel/perf_event.c
@@ -551,6 +551,7 @@ static int arc_pmu_device_probe(struct platform_device *pdev)
#ifdef CONFIG_OF
static const struct of_device_id arc_pmu_match[] = {
{ .compatible = "snps,arc700-pct" },
+ { .compatible = "snps,archs-pct" },
{},
};
MODULE_DEVICE_TABLE(of, arc_pmu_match);
@@ -558,7 +559,7 @@ MODULE_DEVICE_TABLE(of, arc_pmu_match);

static struct platform_driver arc_pmu_driver = {
.driver = {
- .name = "arc700-pct",
+ .name = "arc-pct",
.of_match_table = of_match_ptr(arc_pmu_match),
},
.probe = arc_pmu_device_probe,
--
2.4.3