linux-kernel - Re: [PATCH 2/2] perf: add arm64 smmuv3 pmu driver

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Date:   Sun, 1 Apr 2018 01:44:41 -0400
From:   Neil Leeder <neil.m.leeder@...il.com>
To:     Yisheng Xie <xieyisheng1@...wei.com>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Mark Langsdorf <mlangsdo@...hat.com>,
        Mark Salter <msalter@...hat.com>, Jon Masters <jcm@...hat.com>,
        Timur Tabi <timur@...eaurora.org>,
        Mark Brown <broonie@...nel.org>,
        Agustin Vega-Frias <agustinv@...eaurora.org>,
        Neil Leeder <neil.m.leeder@...il.com>
Subject: Re: [PATCH 2/2] perf: add arm64 smmuv3 pmu driver

Hi Yisheng Xie,

On 3/29/2018 03:03 AM, Yisheng Xie wrote:
> 
> Hi Neil,
> 
> On 2017/8/5 3:59, Neil Leeder wrote:
>> +    mem_resource_0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +    mem_map_0 = devm_ioremap_resource(&pdev->dev, mem_resource_0);
>> +
> Can we use devm_ioremap instead? for the reg_base of smmu_pmu is
> IMPLEMENTATION DEFINED. If the reg of smmu_pmu is inside smmu,
> devm_ioremap_resource will failed and return -EBUSY, eg.:
> 
>   smmu reg ranges:        0x180000000 ~ 0x1801fffff
>   its smmu_pmu reg ranges:    0x180001000 ~ 0x180001fff
> 
Just to let you know that I no longer work at Qualcomm and I won't be 
able to provide updates to this patchset. I expect that others from my 
former team at Qualcomm will pick up ownership.

Neil