From: Saravana Kannan <skannan@codeaurora.org>
To: Mark Rutland <mark.rutland@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>,
will.deacon@arm.com, robh@kernel.org, sudeep.holla@arm.com,
mathieu.poirier@linaro.org, peterz@infradead.org,
jonathan.cameron@huawei.com, linux-kernel@vger.kernel.org,
marc.zyngier@arm.com, leo.yan@linaro.org, frowand.list@gmail.com,
linux-arm-kernel@lists.infradead.org, avilaj@codeaurora.org
Subject: Re: [PATCH v11 8/8] perf: ARM DynamIQ Shared Unit PMU support
Date: Fri, 23 Feb 2018 13:46:50 -0800 [thread overview]
Message-ID: <5A908BCA.3080403@codeaurora.org> (raw)
In-Reply-To: <20180223113552.2gn27h4uxbpo5zoq@lakrids.cambridge.arm.com>
On 02/23/2018 03:35 AM, Mark Rutland wrote:
> On Thu, Feb 22, 2018 at 12:38:39PM -0800, Saravana Kannan wrote:
>> On 02/22/2018 03:33 AM, Mark Rutland wrote:
>>> On Wed, Feb 21, 2018 at 06:32:46PM -0800, Saravana Kannan wrote:
>>>> I'm not exactly sure if we can add entries to perf_type_id. If that's
>>>> allowed maybe we need to add something line PERF_TYPE_DSU and use that?
>>>>
>>>> Or if that's not allowed then would it be better to offset the DSU PMU
>>>> events by some number (say 0x1000) and then delete the event type check or
>>>> pass PERF_TYPE_RAW to perf_pmu_register()?
>>>
>>> As above, neither of these should be necessary.
>>
>> For the userspace interface. How about the kernel interface though?
>> perf_event_create_kernel_counter() takes attr.type as an input. But there's
>> no way to look up the DSU PMU's "type".
>
> There is no lookup mechanism currently.
>
> I take it you want to use DSU events from a kernel module?
Yes
>
> It would be possible to have a simlar name -> type lookup mechanism
> kernel-side, if necessary.
Yeah, this is what I was thinking once you explained how user space
handles this. Just wanted to hear it from this thread. I can submit a patch.
Thanks,
Saravana
--
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2018-02-23 21:46 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-02 11:25 [PATCH v11 0/8] perf: Support for ARM DynamIQ Shared Unit Suzuki K Poulose
2018-01-02 11:25 ` [PATCH v11 1/8] perf: Export perf_event_update_userpage Suzuki K Poulose
2018-01-02 11:25 ` [PATCH v11 2/8] of: Add helper for mapping device node to logical CPU number Suzuki K Poulose
2018-01-02 11:25 ` [PATCH v11 3/8] coresight: of: Use of_cpu_node_to_id helper Suzuki K Poulose
2018-01-02 11:25 ` [PATCH v11 4/8] irqchip: gic-v3: " Suzuki K Poulose
2018-01-02 11:25 ` [PATCH v11 5/8] arm64: Use of_cpu_node_to_id helper for CPU topology parsing Suzuki K Poulose
2018-01-02 11:25 ` [PATCH v11 6/8] arm_pmu: Use of_cpu_node_to_id helper Suzuki K Poulose
2018-01-02 11:25 ` [PATCH v11 7/8] dt-bindings: Document devicetree binding for ARM DSU PMU Suzuki K Poulose
2018-01-02 11:25 ` [PATCH v11 8/8] perf: ARM DynamIQ Shared Unit PMU support Suzuki K Poulose
2018-02-22 2:32 ` Saravana Kannan
2018-02-22 11:33 ` Mark Rutland
2018-02-22 20:38 ` Saravana Kannan
2018-02-23 11:35 ` Mark Rutland
2018-02-23 21:46 ` Saravana Kannan [this message]
2018-02-24 0:53 ` Saravana Kannan
2018-02-25 14:36 ` Mark Rutland
2018-02-28 22:17 ` Saravana Kannan
2018-03-01 11:49 ` Mark Rutland
2018-03-01 20:35 ` Saravana Kannan
2018-03-02 10:42 ` Mark Rutland
2018-03-02 19:19 ` Saravana Kannan
2018-03-05 10:59 ` Mark Rutland
2018-03-05 22:10 ` Saravana Kannan
2018-03-07 14:59 ` Suzuki K Poulose
2018-03-07 21:36 ` Saravana Kannan
2018-03-19 9:50 ` Suzuki K Poulose
2018-03-08 11:42 ` Mark Rutland
2018-03-08 23:59 ` Saravana Kannan
2018-03-09 10:53 ` Suzuki K Poulose
2018-03-09 13:35 ` Mark Rutland
2018-03-09 22:49 ` Saravana Kannan
2018-03-10 15:45 ` Mark Rutland
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