linux-kernel - Re: [PATCH v3 09/12] powerpc: perf/core: use PERF_PMU_CAP_NO

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Message-Id: <f82ff395-1de9-18e9-a00a-b4a186f71c2f@linux.vnet.ibm.com>
Date:   Mon, 10 Dec 2018 09:32:44 +0530
From:   Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
To:     Andrew Murray <andrew.murray@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Russell King <linux@...linux.org.uk>, suzuki.poulose@....com,
        robin.murphy@....com, Michael Ellerman <mpe@...erman.id.au>
Cc:     x86@...nel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-alpha@...r.kernel.org
Subject: Re: [PATCH v3 09/12] powerpc: perf/core: use PERF_PMU_CAP_NO_EXCLUDE
 for exclude incapable PMUs


On 06/12/18 10:17 PM, Andrew Murray wrote:
> For PowerPC PMUs that do not support context exclusion let's
> advertise the PERF_PMU_CAP_NO_EXCLUDE capability. This ensures that
> perf will prevent us from handling events where any exclusion flags
> are set. Let's also remove the now unnecessary check for exclusion
> flags.

Reviewed-by: Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>

>
> Signed-off-by: Andrew Murray <andrew.murray@....com>
> ---
>   arch/powerpc/perf/hv-24x7.c | 10 +---------
>   arch/powerpc/perf/hv-gpci.c | 10 +---------
>   arch/powerpc/perf/imc-pmu.c | 19 +------------------
>   3 files changed, 3 insertions(+), 36 deletions(-)
>
> diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c
> index 72238ee..d2b8e60 100644
> --- a/arch/powerpc/perf/hv-24x7.c
> +++ b/arch/powerpc/perf/hv-24x7.c
> @@ -1306,15 +1306,6 @@ static int h_24x7_event_init(struct perf_event *event)
>   		return -EINVAL;
>   	}
>
> -	/* unsupported modes and filters */
> -	if (event->attr.exclude_user   ||
> -	    event->attr.exclude_kernel ||
> -	    event->attr.exclude_hv     ||
> -	    event->attr.exclude_idle   ||
> -	    event->attr.exclude_host   ||
> -	    event->attr.exclude_guest)
> -		return -EINVAL;
> -
>   	/* no branch sampling */
>   	if (has_branch_stack(event))
>   		return -EOPNOTSUPP;
> @@ -1577,6 +1568,7 @@ static struct pmu h_24x7_pmu = {
>   	.start_txn   = h_24x7_event_start_txn,
>   	.commit_txn  = h_24x7_event_commit_txn,
>   	.cancel_txn  = h_24x7_event_cancel_txn,
> +	.capabilities = PERF_PMU_CAP_NO_EXCLUDE,
>   };
>
>   static int hv_24x7_init(void)
> diff --git a/arch/powerpc/perf/hv-gpci.c b/arch/powerpc/perf/hv-gpci.c
> index 43fabb3..735e77b 100644
> --- a/arch/powerpc/perf/hv-gpci.c
> +++ b/arch/powerpc/perf/hv-gpci.c
> @@ -232,15 +232,6 @@ static int h_gpci_event_init(struct perf_event *event)
>   		return -EINVAL;
>   	}
>
> -	/* unsupported modes and filters */
> -	if (event->attr.exclude_user   ||
> -	    event->attr.exclude_kernel ||
> -	    event->attr.exclude_hv     ||
> -	    event->attr.exclude_idle   ||
> -	    event->attr.exclude_host   ||
> -	    event->attr.exclude_guest)
> -		return -EINVAL;
> -
>   	/* no branch sampling */
>   	if (has_branch_stack(event))
>   		return -EOPNOTSUPP;
> @@ -285,6 +276,7 @@ static struct pmu h_gpci_pmu = {
>   	.start       = h_gpci_event_start,
>   	.stop        = h_gpci_event_stop,
>   	.read        = h_gpci_event_update,
> +	.capabilities = PERF_PMU_CAP_NO_EXCLUDE,
>   };
>
>   static int hv_gpci_init(void)
> diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c
> index 1fafc32b..1dbb0ee 100644
> --- a/arch/powerpc/perf/imc-pmu.c
> +++ b/arch/powerpc/perf/imc-pmu.c
> @@ -473,15 +473,6 @@ static int nest_imc_event_init(struct perf_event *event)
>   	if (event->hw.sample_period)
>   		return -EINVAL;
>
> -	/* unsupported modes and filters */
> -	if (event->attr.exclude_user   ||
> -	    event->attr.exclude_kernel ||
> -	    event->attr.exclude_hv     ||
> -	    event->attr.exclude_idle   ||
> -	    event->attr.exclude_host   ||
> -	    event->attr.exclude_guest)
> -		return -EINVAL;
> -
>   	if (event->cpu < 0)
>   		return -EINVAL;
>
> @@ -748,15 +739,6 @@ static int core_imc_event_init(struct perf_event *event)
>   	if (event->hw.sample_period)
>   		return -EINVAL;
>
> -	/* unsupported modes and filters */
> -	if (event->attr.exclude_user   ||
> -	    event->attr.exclude_kernel ||
> -	    event->attr.exclude_hv     ||
> -	    event->attr.exclude_idle   ||
> -	    event->attr.exclude_host   ||
> -	    event->attr.exclude_guest)
> -		return -EINVAL;
> -
>   	if (event->cpu < 0)
>   		return -EINVAL;
>
> @@ -1069,6 +1051,7 @@ static int update_pmu_ops(struct imc_pmu *pmu)
>   	pmu->pmu.stop = imc_event_stop;
>   	pmu->pmu.read = imc_event_update;
>   	pmu->pmu.attr_groups = pmu->attr_groups;
> +	pmu->pmu.capabilities = PERF_PMU_CAP_NO_EXCLUDE;
>   	pmu->attr_groups[IMC_FORMAT_ATTR] = &imc_format_group;
>
>   	switch (pmu->domain) {