linux-kernel - [PATCH] perf/arm-cmn: Fix the unhandled overflow status of counter 4 to 7

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Message-Id: <1695612152-123633-1-git-send-email-renyu.zj@linux.alibaba.com>
Date:   Mon, 25 Sep 2023 11:22:32 +0800
From:   Jing Zhang <renyu.zj@...ux.alibaba.com>
To:     Robin Murphy <robin.murphy@....com>,
        Ilkka Koskinen <ilkka@...amperecomputing.com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Shuai Xue <xueshuai@...ux.alibaba.com>,
        Zhuo Song <zhuo.song@...ux.alibaba.com>
Subject: [PATCH] perf/arm-cmn: Fix the unhandled overflow status of counter 4 to 7

The register por_dt_pmovsr Bits[7:0] indicates overflow from counters 7
to 0. But in arm_cmn_handle_irq(), only handled the overflow status of
Bits[3:0] which results in unhandled overflow status of counters 4 to 7.

So let the overflow status of DTC counters 4 to 7 to be handled.

Fixes: 0ba64770a2f2 ("perf: Add Arm CMN-600 PMU driver")
Signed-off-by: Jing Zhang <renyu.zj@...ux.alibaba.com>
---
 drivers/perf/arm-cmn.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c
index 913dc04..6b50bc5 100644
--- a/drivers/perf/arm-cmn.c
+++ b/drivers/perf/arm-cmn.c
@@ -1972,7 +1972,7 @@ static irqreturn_t arm_cmn_handle_irq(int irq, void *dev_id)
 		u64 delta;
 		int i;
 
-		for (i = 0; i < CMN_DTM_NUM_COUNTERS; i++) {
+		for (i = 0; i < CMN_DT_NUM_COUNTERS; i++) {
 			if (status & (1U << i)) {
 				ret = IRQ_HANDLED;
 				if (WARN_ON(!dtc->counters[i]))
-- 
1.8.3.1