linux-kernel - [PATCH V3 6/6] csky: Fix perf record in kernel/user space

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Message-Id: <79c0094b29f2315045a9a2544c9837bcf6f78fea.1559544301.git.han_mao@c-sky.com>
Date:   Mon,  3 Jun 2019 14:46:25 +0800
From:   Mao Han <han_mao@...ky.com>
To:     linux-kernel@...r.kernel.org
Cc:     Mao Han <han_mao@...ky.com>, Guo Ren <guoren@...nel.org>,
        linux-csky@...r.kernel.org
Subject: [PATCH V3 6/6] csky: Fix perf record in kernel/user space

csky_pmu_event_init is called several times during the perf record
initialzation. After configure the event counter in either kernel
space or user space, csky_pmu_event_init is called twice with no
attr specified. Configuration will be overwritten with sampling in
both kernel space and user space. --all-kernel/--all-user is
useless without this patch applied.

Signed-off-by: Mao Han <han_mao@...ky.com>
CC: Guo Ren <guoren@...nel.org>
CC: linux-csky@...r.kernel.org
---
 arch/csky/kernel/perf_event.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/csky/kernel/perf_event.c b/arch/csky/kernel/perf_event.c
index de95005..011fd9b 100644
--- a/arch/csky/kernel/perf_event.c
+++ b/arch/csky/kernel/perf_event.c
@@ -983,6 +983,12 @@ static int csky_pmu_event_init(struct perf_event *event)
 	struct hw_perf_event *hwc = &event->hw;
 	int ret;
 
+	if (event->attr.type != PERF_TYPE_HARDWARE &&
+	    event->attr.type != PERF_TYPE_HW_CACHE &&
+	    event->attr.type != PERF_TYPE_RAW) {
+		return -ENOENT;
+	}
+
 	if (event->attr.exclude_user)
 		csky_pmu.hpcr = BIT(2);
 	else if (event->attr.exclude_kernel)
-- 
2.7.4