linux-kernel - Re: [PATCH RFC DNM] perf: Add support for Qualcomm Last-Level Cache Controller PMU

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Message-ID: <f71bc35a-c45c-0429-1164-d047d61ef061@quicinc.com>
Date:   Thu, 24 Aug 2023 14:31:00 -0700
From:   Trilok Soni <quic_tsoni@...cinc.com>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>
CC:     Marijn Suijten <marijn.suijten@...ainline.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH RFC DNM] perf: Add support for Qualcomm Last-Level Cache
 Controller PMU

On 8/9/2023 1:09 PM, Konrad Dybcio wrote:
> Add support for the Qualcomm LLCC (Last-Level Cache Controller) PMU,
> which provides a single event, expressing cache read misses.
> 
> Based on the vendor driver found in the msm-5.10 downstream kernel.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
> Hi, I've been trying to get this driver going upstream by cleaning it
> up and adding the necessary perf boilerplate (the original Qualcomm one
> only pokes at the PMU from within the kernel itself) to use the
> userspace tool.
> 
> I can not however get it to cooperate.. in this iteration I get a PMU
> event registered (though with only a "raw" name - no "x OR y" like with
> other PMUs on the system) as:
> 
> llcc_pmu/read_miss/                                [Kernel PMU event]
> 
> but the .read callback is never called when I run:
> 
> sudo perf stat -C 0 -a -e llcc_pmu/read_miss/ stress-ng -C 8 -c 8 -m 10
> 
> which always returns 0
> 
> if I add --always-kernel I get:
> <not supported>      llcc_pmu/read_miss/

Which SOC you are trying this on?


-- 
---Trilok Soni