linux-kernel - Re: [PATCH v3 1/2] remoteproc: elf_loader: Update resource table name check

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Date:   Wed, 21 Dec 2022 11:24:40 +0530
From:   Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
To:     Mukesh Ojha <quic_mojha@...cinc.com>,
        <linux-remoteproc@...r.kernel.org>, <agross@...nel.org>,
        <andersson@...nel.org>, <lgirdwood@...il.com>,
        <broonie@...nel.org>, <robh+dt@...nel.org>,
        <quic_plai@...cinc.com>, <bgoswami@...cinc.com>, <perex@...ex.cz>,
        <tiwai@...e.com>, <srinivas.kandagatla@...aro.org>,
        <quic_rohkumar@...cinc.com>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <swboyd@...omium.org>,
        <judyhsiao@...omium.org>, <devicetree@...r.kernel.org>,
        <krzysztof.kozlowski@...aro.org>, <mathieu.poirier@...aro.org>,
        <corbet@....net>
Subject: Re: [PATCH v3 1/2] remoteproc: elf_loader: Update resource table name
 check


On 12/20/2022 6:20 PM, Mukesh Ojha wrote:
Thanks for your time Mukesh!!!
> Hi,
>
> On 12/20/2022 1:31 PM, Srinivasa Rao Mandadapu wrote:
>> Update the way of checking resource table name with prefix
>> substring search instead of complete string search.
>> In general Qualcomm DSP binary is prepared by combining different ELFs',
>> hence section header name (e.g. .resource_table), appended with ELF name
>> to differentiate with same section(e.g. 
>> resource_table.ac_bin_process) of
>> different ELFs'.
>> Example readelf output of DSP binary:
>>      [60] .start.ac_bin_process PROGBITS
>>      [61] .resource_table.ac_bin_process PROGBITS
>>      [62] .comment.ac_bin_process PROGBITS
>>
>
> Could we rephrase above like below ? It could be also taken why 
> applying the patch.
>
> Update the way of checking resource table name with prefix substring 
> search instead of complete string search.
>
> In general, Qualcomm DSP binary is prepared by combining different 
> ELF's. Hence, section header name (e.g. .resource_table), appended
> with ELF name to differentiate with same section(e.g. 
> resource_table.ac_bin_process) of different ELFs'.
>
> Example readelf output of DSP binary:
>       [60] .start.ac_bin_process PROGBITS
>       [61] .resource_table.ac_bin_process PROGBITS
>       [62] .comment.ac_bin_process PROGBITS
>
Okay. will change accordingly.
>
> Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
>
> Otherwise, LGTM.
> Reviewed-by: Mukesh Ojha <quic_mojha@...cinc.com>
>
> -Mukesh
>> ---
>>   drivers/remoteproc/remoteproc_elf_loader.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/remoteproc/remoteproc_elf_loader.c 
>> b/drivers/remoteproc/remoteproc_elf_loader.c
>> index 5a412d7..77330d6 100644
>> --- a/drivers/remoteproc/remoteproc_elf_loader.c
>> +++ b/drivers/remoteproc/remoteproc_elf_loader.c
>> @@ -272,7 +272,7 @@ find_table(struct device *dev, const struct 
>> firmware *fw)
>>           u64 offset = elf_shdr_get_sh_offset(class, shdr);
>>           u32 name = elf_shdr_get_sh_name(class, shdr);
>>   -        if (strcmp(name_table + name, ".resource_table"))
>> +        if (!strstarts(name_table + name, ".resource_table"))
>>               continue;
>>             table = (struct resource_table *)(elf_data + offset);