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

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Message-ID: <46632fb9-e07e-fa40-5f13-fb45b4014e03@codeaurora.org>
Date:   Wed, 29 Jul 2020 10:15:36 -0700
From:   Elliot Berman <eberman@...eaurora.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>
Subject: Re: [PATCH 1/2] firmware: qcom_scm: Add memory protect virtual
 address ranges

++

On 7/24/2020 8:04 AM, Stanimir Varbanov wrote:
> 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);
>> +

Small nit, can you bump the function above assign_mem? It would keep order aligned with
the macros in qcom_scm.h

>>  /**
>>   * 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);

Same here.

>>  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; }

Same here.

>>  
>>  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,
>>
> 

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