linux-kernel - Re: [PATCH v4 3/5] soc: qcom: smem: introduce qcom_smem_get_soc

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Message-ID: <20230526190437.yekx5ufpwxkowlrp@ripper>
Date:   Fri, 26 May 2023 12:04:37 -0700
From:   Bjorn Andersson <andersson@...nel.org>
To:     Robert Marko <robimarko@...il.com>
Cc:     agross@...nel.org, konrad.dybcio@...aro.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, ansuelsmth@...il.com
Subject: Re: [PATCH v4 3/5] soc: qcom: smem: introduce qcom_smem_get_soc_id()

On Thu, May 25, 2023 at 11:02:12PM +0200, 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>
> ---
> Changes in v4:
> * Change helper name to qcom_smem_get_soc_id()
> * Remove len and just pass NULL, that is sufficient here
> 
> Changes in v3:
> * Change export to EXPORT_SYMBOL_GPL
> * Use an argument for returning SoC ID
> * Update kerneldoc
> ---
>  drivers/soc/qcom/smem.c       | 23 +++++++++++++++++++++++
>  include/linux/soc/qcom/smem.h |  2 ++
>  2 files changed, 25 insertions(+)
> 
> diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
> index bc98520c4969..78cf79ea4924 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 +773,28 @@ phys_addr_t qcom_smem_virt_to_phys(void *p)
>  }
>  EXPORT_SYMBOL_GPL(qcom_smem_virt_to_phys);
>  
> +/**
> + * qcom_smem_get_soc_id() - return the SoC ID
> + * @id:	On success, we return the SoC ID here.
> + *
> + * Look up SoC ID from HW/SW build ID and return it.
> + *
> + * Return: 0 on success, negative errno on failure.
> + */
> +int qcom_smem_get_soc_id(u32 *id)
> +{
> +	struct socinfo *info;
> +
> +	info = qcom_smem_get(QCOM_SMEM_HOST_ANY, SMEM_HW_SW_BUILD_ID, NULL);
> +	if (IS_ERR(info))
> +		return PTR_ERR(info);
> +
> +	*id = info->id;

So just to make the discussion between Konrad and me clear, please wrap
the info->id access in __le32_to_cpu() and the series is ready to go.

Thanks,
Bjorn

> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(qcom_smem_get_soc_id);
> +
>  static int qcom_smem_get_sbl_version(struct qcom_smem *smem)
>  {
>  	struct smem_header *header;
> diff --git a/include/linux/soc/qcom/smem.h b/include/linux/soc/qcom/smem.h
> index 86e1b358688a..223db6a9c733 100644
> --- a/include/linux/soc/qcom/smem.h
> +++ b/include/linux/soc/qcom/smem.h
> @@ -11,4 +11,6 @@ int qcom_smem_get_free_space(unsigned host);
>  
>  phys_addr_t qcom_smem_virt_to_phys(void *p);
>  
> +int qcom_smem_get_soc_id(u32 *id);
> +
>  #endif
> -- 
> 2.40.1
>