linux-kernel - Re: [PATCH v2 1/3] soc: qcom: Add scm call to protect modem mem in qcom scm driver.

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Date:   Mon, 27 Feb 2017 14:55:58 -0800
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Avaneesh Kumar Dwivedi <akdwived@...eaurora.org>
Cc:     bjorn.andersson@...aro.org, agross@...eaurora.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-remoteproc@...r.kernel.org
Subject: Re: [PATCH v2 1/3] soc: qcom: Add scm call to protect modem mem in
 qcom scm driver.

On 01/30, Avaneesh Kumar Dwivedi wrote:
> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
> index 893f953ea..f476803 100644
> --- a/drivers/firmware/qcom_scm.c
> +++ b/drivers/firmware/qcom_scm.c
> @@ -292,6 +292,20 @@ int qcom_scm_pas_shutdown(u32 peripheral)
>  }
>  EXPORT_SYMBOL(qcom_scm_pas_shutdown);
>  
> +/**
> + * qcom_scm_assign_mem() - Apply new access permission of DDR
> + * region passed via descriptor and does second stage
> + * translation of intermediate physical address.
> + * @desc: descriptor to send to hypervisor
> + *
> + * Return 0 on success.
> + */
> +int qcom_scm_assign_mem(void *desc)

Please don't pass a void pointer here. Driver authors shouldn't
need to know about qcom_scm_desc. This should be an API that the
driver can use without knowing intimate firmware details.

> +{
> +	return __qcom_scm_assign_mem(__scm->dev, desc);
> +}
> +EXPORT_SYMBOL(qcom_scm_assign_mem);
> +
>  static int qcom_scm_pas_reset_assert(struct reset_controller_dev *rcdev,
>  				     unsigned long idx)
>  {
> diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h
> index 3584b00..d88fd4b 100644
> --- a/drivers/firmware/qcom_scm.h
> +++ b/drivers/firmware/qcom_scm.h
> @@ -47,6 +47,8 @@ extern int __qcom_scm_hdcp_req(struct device *dev,
>  #define QCOM_SCM_PAS_SHUTDOWN_CMD	0x6
>  #define QCOM_SCM_PAS_IS_SUPPORTED_CMD	0x7
>  #define QCOM_SCM_PAS_MSS_RESET		0xa
> +#define QCOM_SCM_SVC_MP				0xc
> +#define QCOM_MEM_PROT_ASSIGN_ID		0x16

Presumably these should go near the newly introduced functions
like how the rest of this file is organized.

>  extern bool __qcom_scm_pas_supported(struct device *dev, u32 peripheral);

-- 
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