linux-kernel - Re: [PATCH 1/2] firmware: qcom_scm: Add memory protect virtual address ranges

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Message-ID: <33a63665-2f75-1b58-8a0c-3b0a8979fb85@linaro.org>
Date:   Fri, 24 Jul 2020 18:04:24 +0300
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Elliot Berman <eberman@...eaurora.org>
Subject: Re: [PATCH 1/2] firmware: qcom_scm: Add memory protect virtual
 address ranges

Hi,

Gentle ping for review.

On 7/9/20 2:58 PM, Stanimir Varbanov wrote:
> This adds a new SCM memprotect command to set virtual address ranges.
> 
> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
> ---
>  drivers/firmware/qcom_scm.c | 24 ++++++++++++++++++++++++
>  drivers/firmware/qcom_scm.h |  1 +
>  include/linux/qcom_scm.h    |  8 +++++++-
>  3 files changed, 32 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
> index 0e7233a20f34..a73870255c2e 100644
> --- a/drivers/firmware/qcom_scm.c
> +++ b/drivers/firmware/qcom_scm.c
> @@ -864,6 +864,30 @@ int qcom_scm_assign_mem(phys_addr_t mem_addr, size_t mem_sz,
>  }
>  EXPORT_SYMBOL(qcom_scm_assign_mem);
>  
> +int qcom_scm_mem_protect_video_var(u32 cp_start, u32 cp_size,
> +				   u32 cp_nonpixel_start,
> +				   u32 cp_nonpixel_size)
> +{
> +	int ret;
> +	struct qcom_scm_desc desc = {
> +		.svc = QCOM_SCM_SVC_MP,
> +		.cmd = QCOM_SCM_MP_VIDEO_VAR,
> +		.arginfo = QCOM_SCM_ARGS(4, QCOM_SCM_VAL, QCOM_SCM_VAL,
> +					 QCOM_SCM_VAL, QCOM_SCM_VAL),
> +		.args[0] = cp_start,
> +		.args[1] = cp_size,
> +		.args[2] = cp_nonpixel_start,
> +		.args[3] = cp_nonpixel_size,
> +		.owner = ARM_SMCCC_OWNER_SIP,
> +	};
> +	struct qcom_scm_res res;
> +
> +	ret = qcom_scm_call(__scm->dev, &desc, &res);
> +
> +	return ret ? : res.result[0];
> +}
> +EXPORT_SYMBOL(qcom_scm_mem_protect_video_var);
> +
>  /**
>   * qcom_scm_ocmem_lock_available() - is OCMEM lock/unlock interface available
>   */
> diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h
> index d9ed670da222..14da834ac593 100644
> --- a/drivers/firmware/qcom_scm.h
> +++ b/drivers/firmware/qcom_scm.h
> @@ -97,6 +97,7 @@ extern int scm_legacy_call(struct device *dev, const struct qcom_scm_desc *desc,
>  #define QCOM_SCM_MP_RESTORE_SEC_CFG		0x02
>  #define QCOM_SCM_MP_IOMMU_SECURE_PTBL_SIZE	0x03
>  #define QCOM_SCM_MP_IOMMU_SECURE_PTBL_INIT	0x04
> +#define QCOM_SCM_MP_VIDEO_VAR			0x08
>  #define QCOM_SCM_MP_ASSIGN			0x16
>  
>  #define QCOM_SCM_SVC_OCMEM		0x0f
> diff --git a/include/linux/qcom_scm.h b/include/linux/qcom_scm.h
> index 3d6a24697761..19b5188d17f4 100644
> --- a/include/linux/qcom_scm.h
> +++ b/include/linux/qcom_scm.h
> @@ -81,7 +81,9 @@ extern int qcom_scm_assign_mem(phys_addr_t mem_addr, size_t mem_sz,
>  			       unsigned int *src,
>  			       const struct qcom_scm_vmperm *newvm,
>  			       unsigned int dest_cnt);
> -
> +extern int qcom_scm_mem_protect_video_var(u32 cp_start, u32 cp_size,
> +					  u32 cp_nonpixel_start,
> +					  u32 cp_nonpixel_size);
>  extern bool qcom_scm_ocmem_lock_available(void);
>  extern int qcom_scm_ocmem_lock(enum qcom_scm_ocmem_client id, u32 offset,
>  			       u32 size, u32 mode);
> @@ -131,6 +133,10 @@ static inline int qcom_scm_iommu_secure_ptbl_init(u64 addr, u32 size, u32 spare)
>  static inline int qcom_scm_assign_mem(phys_addr_t mem_addr, size_t mem_sz,
>  		unsigned int *src, const struct qcom_scm_vmperm *newvm,
>  		unsigned int dest_cnt) { return -ENODEV; }
> +extern inline int qcom_scm_mem_protect_video_var(u32 cp_start, u32 cp_size,
> +						 u32 cp_nonpixel_start,
> +						 u32 cp_nonpixel_size)
> +		{ return -ENODEV; }
>  
>  static inline bool qcom_scm_ocmem_lock_available(void) { return false; }
>  static inline int qcom_scm_ocmem_lock(enum qcom_scm_ocmem_client id, u32 offset,
> 

-- 
regards,
Stan