linux-kernel - [PATCH] driver: perf: arm_pmuv3: Read PMMIR

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Message-Id: <20231009075631.193208-1-anshuman.khandual@arm.com>
Date:   Mon,  9 Oct 2023 13:26:31 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] driver: perf: arm_pmuv3: Read PMMIR_EL1 unconditionally

PMMIR_EL1 needs to be captured in 'armpmu->reg_pmmir', for all appropriate
PMU version implementations where the register is available and reading it
is valid . Hence checking for bus slot event presence is redundant and can
be dropped.

Cc: Will Deacon <will@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
This applies on v6.6-rc5.
 
 drivers/perf/arm_pmuv3.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/perf/arm_pmuv3.c b/drivers/perf/arm_pmuv3.c
index 1e72b486c033..9fc1b6da5106 100644
--- a/drivers/perf/arm_pmuv3.c
+++ b/drivers/perf/arm_pmuv3.c
@@ -1129,7 +1129,7 @@ static void __armv8pmu_probe_pmu(void *info)
 			     pmceid, ARMV8_PMUV3_MAX_COMMON_EVENTS);
 
 	/* store PMMIR register for sysfs */
-	if (is_pmuv3p4(pmuver) && (pmceid_raw[1] & BIT(31)))
+	if (is_pmuv3p4(pmuver))
 		cpu_pmu->reg_pmmir = read_pmmir();
 	else
 		cpu_pmu->reg_pmmir = 0;
-- 
2.25.1