linux-kernel - Re: [PATCH V4 6/6] csky: Fix perf record in kernel/user space

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Date:   Tue, 4 Jun 2019 14:36:45 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Mao Han <han_mao@...ky.com>
Cc:     linux-kernel@...r.kernel.org, linux-csky@...r.kernel.org
Subject: Re: [PATCH V4 6/6] csky: Fix perf record in kernel/user space

Just move attr.exclude_user after switch, like this:

OK?

diff --git a/arch/csky/kernel/perf_event.c b/arch/csky/kernel/perf_event.c
index 376c972..3470cfa 100644
--- a/arch/csky/kernel/perf_event.c
+++ b/arch/csky/kernel/perf_event.c
@@ -844,15 +844,6 @@ static int csky_pmu_event_init(struct perf_event *event)
        struct hw_perf_event *hwc = &event->hw;
        int ret;

-       if (event->attr.exclude_user)
-               csky_pmu.hpcr = BIT(2);
-       else if (event->attr.exclude_kernel)
-               csky_pmu.hpcr = BIT(3);
-       else
-               csky_pmu.hpcr = BIT(2) | BIT(3);
-
-       csky_pmu.hpcr |= BIT(1) | BIT(0);
-
        switch (event->attr.type) {
        case PERF_TYPE_HARDWARE:
                if (event->attr.config >= PERF_COUNT_HW_MAX)
@@ -861,21 +852,31 @@ static int csky_pmu_event_init(struct perf_event *event)
                if (ret == HW_OP_UNSUPPORTED)
                        return -ENOENT;
                hwc->idx = ret;
-               return 0;
+               break;
        case PERF_TYPE_HW_CACHE:
                ret = csky_pmu_cache_event(event->attr.config);
                if (ret == CACHE_OP_UNSUPPORTED)
                        return -ENOENT;
                hwc->idx = ret;
-               return 0;
+               break;
        case PERF_TYPE_RAW:
                if (hw_raw_read_mapping[event->attr.config] == NULL)
                        return -ENOENT;
                hwc->idx = event->attr.config;
-               return 0;
+               break;
        default:
                return -ENOENT;
        }
+
+       if (event->attr.exclude_user)
+               csky_pmu.hpcr = BIT(2);
+       else if (event->attr.exclude_kernel)
+               csky_pmu.hpcr = BIT(3);
+       else
+               csky_pmu.hpcr = BIT(2) | BIT(3);
+
+       csky_pmu.hpcr |= BIT(1) | BIT(0);
+
 }

On Tue, Jun 4, 2019 at 10:25 AM Mao Han <han_mao@...ky.com> wrote:
>
> 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 dc84dc7..e3308ab 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
>