From: "liuqi (BA)" <liuqi115@huawei.com>
To: Will Deacon <will@kernel.org>, Qi Liu <liuqi115@huawei.com>
Cc: <linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Linuxarm <linuxarm@huawei.com>
Subject: Re: [PATCH v2 1/9] perf: Add EVENT_ATTR_ID to simplify event attributes
Date: Wed, 2 Jun 2021 16:45:23 +0800 [thread overview]
Message-ID: <30abdbec-3174-1f8a-47d4-63a4de3b1e47@huawei.com> (raw)
In-Reply-To: <20210601131020.GD28025@willie-the-truck>
Hi Will,
Thanks for reviewing this patch.
On 2021/6/1 21:10, Will Deacon wrote:
> On Wed, May 19, 2021 at 05:51:51PM +0800, Qi Liu wrote:
>> Similar EVENT_ATTR macros are defined in many PMU drivers,
>> like HiSilicon PMU driver, Arm PMU driver, Arm SMMU PMU
>> driver. So Add a generic macro to simplify code.
>>
>> Cc: Peter Zijlstra <peterz@infradead.org>
>> Cc: Ingo Molnar <mingo@redhat.com>
>> Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
>> Cc: Mark Rutland <mark.rutland@arm.com>
>> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
>> Signed-off-by: Qi Liu <liuqi115@huawei.com>
>> ---
>> include/linux/perf_event.h | 6 ++++++
>> kernel/events/core.c | 2 ++
>> 2 files changed, 8 insertions(+)
>>
>> diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
>> index f5a6a2f..d0aa74e 100644
>> --- a/include/linux/perf_event.h
>> +++ b/include/linux/perf_event.h
>> @@ -1576,6 +1576,12 @@ static struct perf_pmu_events_attr _var = { \
>> .event_str = _str, \
>> };
>>
>> +#define PMU_EVENT_ATTR_ID(_name, _id) \
>> + (&((struct perf_pmu_events_attr[]) { \
>> + { .attr = __ATTR(_name, 0444, perf_event_sysfs_show, NULL), \
>> + .id = _id, } \
>> + })[0].attr.attr)
>> +
>> #define PMU_FORMAT_ATTR(_name, _format) \
>> static ssize_t \
>> _name##_show(struct device *dev, \
>> diff --git a/kernel/events/core.c b/kernel/events/core.c
>> index 0ac818b..330d9cc 100644
>> --- a/kernel/events/core.c
>> +++ b/kernel/events/core.c
>> @@ -13295,6 +13295,8 @@ ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr,
>>
>> if (pmu_attr->event_str)
>> return sprintf(page, "%s\n", pmu_attr->event_str);
>> + else
>> + return sprintf(page, "config=%#llx\n", pmu_attr->id);
>
> I think it's a really bad idea to hardcode this here. For example, I think
> this patch series breaks user ABI for the SMMU PMU which used to print:
>
> "event=0x%02llx\n"
>
> and by the looks of it many of the other conversions are unsound too.
>
Got it, so I'll use pmu_attr->event_str here, for example,
SMMU_EVENT_ATTR(cycles, "event=0x00")
As PMU_EVENT_ATTR_STRING is already defined in linux/perf_event.h,and is
used in drivers of multi architectures, add a new common macro might be
better than modify PMU_EVENT_ATTR_STRING.
Do you have any suggestion about the name of new common macro?
Thanks,
Qi
> I'm all for a common macro, but the string needs to be determined by the
> driver.
>
> Will
> .
>
next prev parent reply other threads:[~2021-06-02 8:45 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-19 9:51 [PATCH v2 0/9] drivers/perf: Use general macro to simplify event attributes Qi Liu
2021-05-19 9:51 ` [PATCH v2 1/9] perf: Add EVENT_ATTR_ID " Qi Liu
2021-06-01 13:10 ` Will Deacon
2021-06-02 8:45 ` liuqi (BA) [this message]
2021-06-02 9:49 ` Will Deacon
2021-06-02 10:49 ` liuqi (BA)
2021-05-19 9:51 ` [PATCH v2 2/9] drivers/perf: hisi: Remove redundant macro and functions Qi Liu
2021-05-19 9:51 ` [PATCH v2 3/9] drivers/perf: Remove redundant macro and functions in SMMU PMU driver Qi Liu
2021-05-19 9:51 ` [PATCH v2 4/9] drivers/perf: Remove redundant macro and functions in qcom_l2_pmu.c Qi Liu
2021-05-19 9:51 ` [PATCH v2 5/9] drivers/perf: Remove redundant macro and functions in qcom_l3_pmu.c Qi Liu
2021-05-19 9:51 ` [PATCH v2 6/9] drivers/perf: Remove redundant macro and functions in xgene_pmu.c Qi Liu
2021-05-19 9:51 ` [PATCH v2 7/9] drivers/perf: Remove redundant macro and functions in fsl_imx8_ddr_perf.c Qi Liu
2021-05-19 14:36 ` Frank Li
2021-05-19 9:51 ` [PATCH v2 8/9] drivers/perf: Remove redundant macro and functions in arm_dsu_pmu.c Qi Liu
2021-05-19 9:51 ` [PATCH v2 9/9] arm64: perf: Remove redundant macro and functions in perf_event.c Qi Liu
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