Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <68600ea4-9f65-f365-382a-444c60b4a25d@kali.org>
Date:   Tue, 26 Jul 2022 10:15:49 -0500
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0)
 Gecko/20100101 Thunderbird/91.11.0
Subject: Re: [PATCH 10/10] arm64: dts: qcom: sdm845: add LLCC BWMON
Content-Language: en-US
To:     Sibi Sankar <quic_sibis@quicinc.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Konrad Dybcio <konrad.dybcio@somainline.org>,
        Georgi Djakov <djakov@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     Rajendra Nayak <quic_rjendra@quicinc.com>
References: <20220720192807.130098-1-krzysztof.kozlowski@linaro.org>
 <20220720192807.130098-11-krzysztof.kozlowski@linaro.org>
 <25673493-4171-62b0-f696-1316d115f388@kali.org>
 <96552a95-8939-3ac2-c9b3-14dabaf53923@linaro.org>
 <d814a6da-b0d7-2fd1-fd14-8f1f3b88666f@kali.org>
 <d89a540f-672d-83de-d19d-00f10e4370d1@kali.org>
 <fec6bd98-5efd-fe34-6d75-1765219acd82@linaro.org>
 <25321f37-dbea-188b-1b11-e983a00701b2@quicinc.com>
From:   Steev Klimaszewski <steev@kali.org>
In-Reply-To: <25321f37-dbea-188b-1b11-e983a00701b2@quicinc.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
Precedence: bulk


On 7/26/22 6:31 AM, Sibi Sankar wrote:
> On 7/23/22 2:06 PM, Krzysztof Kozlowski wrote:
>> On 23/07/2022 04:37, Steev Klimaszewski wrote:
>>>>
>>>> Currently it's 5.19.0-rc7 (torvalds tree at 4ba1329c) with a few extra
>>>> patches on top, the bwmon set included.  It's possible that secure
>>>> world uses it, but I do not know enough about that to say one way or
>>>> the other.
>>
>> To test patches you should apply them on maintainer's tree or
>> linux-next. Applying on other trees of course might be useful for
>> testing some backports, but it is independent process and different 
>> issue.
>>
>>>>
>>>> -- steev
>>>>
>>> I think you may be right; I just applied this patchset to -next
>>> (20220722) and i do not see the error message there.  On my 5.19-rc7
>>> tree, i am also testing a patchset that enables qcom devices to access
>>> efivars, so possibly we are ending up in secure world there?
>>
>> Actually mapping of IO space should not touch secure world, so this was
>> a long shot assuming you test it on the next.
>>
>
> The memory region specified in device tree overlaps with the llcc system
> cache controller node. Steev probably had the QCOM_LLCC config enabled 
> when he tested it out on his branch.
>
>>
>> Best regards,
>> Krzysztof
>>
Good catch!  You are correct, my -next config did not have QCOM_LLCC 
set, and I am using QCOM_LLCC=m on the 5.19.0 release candidate.