linux-kernel - Re: [PATCH v2 2/5] soc: qcom: smem: Read version by using the smem header

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Date:   Thu, 14 Sep 2017 18:09:59 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Chris Lew <clew@...eaurora.org>
Cc:     andy.gross@...aro.org, david.brown@...aro.org,
        aneela@...eaurora.org, linux-arm-msm@...r.kernel.org,
        linux-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/5] soc: qcom: smem: Read version by using the smem
 header

On Thu 14 Sep 14:24 PDT 2017, Chris Lew wrote:

> The SMEM header structure includes the version information.
> Read the version directly from the header instead of getting
> an item from the global heap.
> 
> Signed-off-by: Chris Lew <clew@...eaurora.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
> 
> Changes since v1:
> - Remove unused smem item version macro
> - Move smem get version change to separate commit
> 
>  drivers/soc/qcom/smem.c | 25 ++++++++-----------------
>  1 file changed, 8 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
> index db04c45d4132..540322ae409e 100644
> --- a/drivers/soc/qcom/smem.c
> +++ b/drivers/soc/qcom/smem.c
> @@ -63,13 +63,12 @@
>   */
>  
>  /*
> - * Item 3 of the global heap contains an array of versions for the various
> - * software components in the SoC. We verify that the boot loader version is
> - * what the expected version (SMEM_EXPECTED_VERSION) as a sanity check.
> + * The version member of the smem header contains an array of versions for the
> + * various software components in the SoC. We verify that the boot loader
> + * version is a valid version as a sanity check.
>   */
> -#define SMEM_ITEM_VERSION	3
> -#define  SMEM_MASTER_SBL_VERSION_INDEX	7
> -#define  SMEM_EXPECTED_VERSION		11
> +#define SMEM_MASTER_SBL_VERSION_INDEX	7
> +#define SMEM_EXPECTED_VERSION		11
>  
>  /*
>   * The first 8 items are only to be allocated by the boot loader while
> @@ -604,19 +603,11 @@ int qcom_smem_get_free_space(unsigned host)
>  
>  static int qcom_smem_get_sbl_version(struct qcom_smem *smem)
>  {
> +	struct smem_header *header;
>  	__le32 *versions;
> -	size_t size;
> -
> -	versions = qcom_smem_get_global(smem, SMEM_ITEM_VERSION, &size);
> -	if (IS_ERR(versions)) {
> -		dev_err(smem->dev, "Unable to read the version item\n");
> -		return -ENOENT;
> -	}
>  
> -	if (size < sizeof(unsigned) * SMEM_MASTER_SBL_VERSION_INDEX) {
> -		dev_err(smem->dev, "Version item is too small\n");
> -		return -EINVAL;
> -	}
> +	header = smem->regions[0].virt_base;
> +	versions = header->version;
>  
>  	return le32_to_cpu(versions[SMEM_MASTER_SBL_VERSION_INDEX]);
>  }
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>