linux-kernel - Re: [PATCH v2 2/4] soc: qcom: smem: introduce qcom_smem_get_msm

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Date:   Wed, 24 May 2023 20:27:03 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Trilok Soni <quic_tsoni@...cinc.com>,
        Robert Marko <robimarko@...il.com>, agross@...nel.org,
        andersson@...nel.org, ilia.lin@...nel.org, rafael@...nel.org,
        viresh.kumar@...aro.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org
Cc:     ansuelsmth@...il.com
Subject: Re: [PATCH v2 2/4] soc: qcom: smem: introduce qcom_smem_get_msm_id()



On 24.05.2023 20:16, Trilok Soni wrote:
> On 5/24/2023 9:23 AM, Robert Marko wrote:
>> Introduce a helper to return the SoC SMEM ID, which is used to identify the
>> exact SoC model as there may be differences in the same SoC family.
>>
>> Currently, cpufreq-nvmem does this completely in the driver and there has
>> been more interest expresed for other drivers to use this information so
>> lets expose a common helper to prevent redoing it in individual drivers
>> since this field is present on every SMEM table version.
>>
>> Signed-off-by: Robert Marko <robimarko@...il.com>
>> ---
>>   drivers/soc/qcom/smem.c       | 19 +++++++++++++++++++
>>   include/linux/soc/qcom/smem.h |  2 ++
>>   2 files changed, 21 insertions(+)
>>
>> diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
>> index 6be7ea93c78c..0d6ba9bce8cb 100644
>> --- a/drivers/soc/qcom/smem.c
>> +++ b/drivers/soc/qcom/smem.c
>> @@ -14,6 +14,7 @@
>>   #include <linux/sizes.h>
>>   #include <linux/slab.h>
>>   #include <linux/soc/qcom/smem.h>
>> +#include <linux/soc/qcom/socinfo.h>
>>     /*
>>    * The Qualcomm shared memory system is a allocate only heap structure that
>> @@ -772,6 +773,24 @@ phys_addr_t qcom_smem_virt_to_phys(void *p)
>>   }
>>   EXPORT_SYMBOL(qcom_smem_virt_to_phys);
>>   +/**
>> + * qcom_smem_get_msm_id() - return the SoC ID
>> + *
>> + * Look up SoC ID from HW/SW build ID and return it.
>> + */
>> +int qcom_smem_get_msm_id(void)
On top of Trilok's point, this should return le32, or at least unsigned int.

Konrad
>> +{
>> +    size_t len;
>> +    struct socinfo *info;
>> +
>> +    info = qcom_smem_get(QCOM_SMEM_HOST_ANY, SMEM_HW_SW_BUILD_ID, &len);
>> +    if (IS_ERR(info))
>> +        return PTR_ERR(info);
>> +
>> +    return __le32_to_cpu(info->id);
>> +}
>> +EXPORT_SYMBOL(qcom_smem_get_msm_id);
> 
> EXPORT_SYMBOL_GPL please?
> 
> Please change it for other symbols in the driver as well w/ separate patch.
> 
> ---Trilok Soni
> 
>