[PATCH v2 2/2] perf/arm-cmn: Enable support for tertiary match group

Ilkka Koskinen
2024-03-07T23:10:07Z

Add support for tertiary match group.

Signed-off-by: Ilkka Koskinen <ilkka@os.amperecomputing.com>
---
drivers/perf/arm-cmn.c | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c
index 29d46e0cf1cd..4a4cbda94907 100644
--- a/drivers/perf/arm-cmn.c
+++ b/drivers/perf/arm-cmn.c
@@ -174,9 +174,8 @@
#define CMN_CONFIG_WP_COMBINE GENMASK_ULL(30, 27)
#define CMN_CONFIG_WP_DEV_SEL GENMASK_ULL(50, 48)
#define CMN_CONFIG_WP_CHN_SEL GENMASK_ULL(55, 51)
-/* Note that we don't yet support the tertiary match group on newer IPs */
-#define CMN_CONFIG_WP_GRP BIT_ULL(56)
-#define CMN_CONFIG_WP_EXCLUSIVE BIT_ULL(57)
+#define CMN_CONFIG_WP_GRP GENMASK_ULL(57, 56)
+#define CMN_CONFIG_WP_EXCLUSIVE BIT_ULL(58)
#define CMN_CONFIG1_WP_VAL GENMASK_ULL(63, 0)
#define CMN_CONFIG2_WP_MASK GENMASK_ULL(63, 0)

@@ -1389,7 +1388,7 @@ static void arm_cmn_claim_wp_idx(struct arm_cmn *cmn,
set_bit(2 * xp_idx + (wp_idx & 1), hw->wp_cfg);
}

-static u32 arm_cmn_wp_config(struct perf_event *event)
+static u32 arm_cmn_wp_config(struct perf_event *event, int wp_idx)
{
u32 config;
u32 dev = CMN_EVENT_WP_DEV_SEL(event);
@@ -1399,6 +1398,10 @@ static u32 arm_cmn_wp_config(struct perf_event *event)
u32 combine = CMN_EVENT_WP_COMBINE(event);
bool is_cmn600 = to_cmn(event->pmu)->part == PART_CMN600;

+ /* CMN-600 supports only primary and secondary matching groups */
+ if (is_cmn600)
+ grp &= 1;
+
config = FIELD_PREP(CMN_DTM_WPn_CONFIG_WP_DEV_SEL, dev) |
FIELD_PREP(CMN_DTM_WPn_CONFIG_WP_CHN_SEL, chn) |
FIELD_PREP(CMN_DTM_WPn_CONFIG_WP_GRP, grp) |
@@ -1406,7 +1409,9 @@ static u32 arm_cmn_wp_config(struct perf_event *event)
if (exc)
config |= is_cmn600 ? CMN600_WPn_CONFIG_WP_EXCLUSIVE :
CMN_DTM_WPn_CONFIG_WP_EXCLUSIVE;
- if (combine && !grp)
+
+ /* wp_combine is available only on WP0 and WP2 */
+ if (combine && !(wp_idx & 0x1))
config |= is_cmn600 ? CMN600_WPn_CONFIG_WP_COMBINE :
CMN_DTM_WPn_CONFIG_WP_COMBINE;
return config;
@@ -1919,12 +1924,14 @@ static int arm_cmn_event_add(struct perf_event *event, int flags)
input_sel = CMN__PMEVCNT0_INPUT_SEL_XP + dtm_idx;
} else if (type == CMN_TYPE_WP) {
int tmp, wp_idx;
- u32 cfg = arm_cmn_wp_config(event);
+ u32 cfg;

wp_idx = arm_cmn_find_free_wp_idx(cmn, dtm, event);
if (wp_idx < 0)
goto free_dtms;

+ cfg = arm_cmn_wp_config(event, wp_idx);
+
tmp = dtm->wp_event[wp_idx ^ 1];
if (tmp >= 0 && CMN_EVENT_WP_COMBINE(event) !=
CMN_EVENT_WP_COMBINE(cmn->dtc[d].counters[tmp]))
--
2.43.2