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Date:   Mon, 25 Mar 2019 14:09:56 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Vivek Gautam <vivek.gautam@...eaurora.org>
Cc:     joro@...tes.org, andy.gross@...aro.org, will.deacon@....com,
        robin.murphy@....com, iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, david.brown@...aro.org,
        tfiga@...omium.org, swboyd@...omium.org,
        linux-kernel@...r.kernel.org, robdclark@...il.com
Subject: Re: [PATCH v2 2/4] firmware/qcom_scm: Add atomic version of io
 read/write APIs

On Sun 09 Sep 23:25 PDT 2018, Vivek Gautam wrote:

> Add atomic versions of qcom_scm_io_readl/writel to enable
> reading/writing secure registers from atomic context.
> 
> Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>

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

Regards,
Bjorn

> ---
>  drivers/firmware/qcom_scm-32.c | 12 ++++++++++++
>  drivers/firmware/qcom_scm-64.c | 32 ++++++++++++++++++++++++++++++++
>  drivers/firmware/qcom_scm.c    | 12 ++++++++++++
>  drivers/firmware/qcom_scm.h    |  4 ++++
>  include/linux/qcom_scm.h       |  4 ++++
>  5 files changed, 64 insertions(+)
> 
> diff --git a/drivers/firmware/qcom_scm-32.c b/drivers/firmware/qcom_scm-32.c
> index 4e24e591ae74..7293e5efad69 100644
> --- a/drivers/firmware/qcom_scm-32.c
> +++ b/drivers/firmware/qcom_scm-32.c
> @@ -627,3 +627,15 @@ int __qcom_scm_io_writel(struct device *dev, phys_addr_t addr, unsigned int val)
>  	return qcom_scm_call_atomic2(QCOM_SCM_SVC_IO, QCOM_SCM_IO_WRITE,
>  				     addr, val);
>  }
> +
> +int __qcom_scm_io_readl_atomic(struct device *dev, phys_addr_t addr,
> +			       unsigned int *val)
> +{
> +	return -ENODEV;
> +}
> +
> +int __qcom_scm_io_writel_atomic(struct device *dev, phys_addr_t addr,
> +				unsigned int val)
> +{
> +	return -ENODEV;
> +}
> diff --git a/drivers/firmware/qcom_scm-64.c b/drivers/firmware/qcom_scm-64.c
> index 3a8c867cdf51..6bf55403f6e3 100644
> --- a/drivers/firmware/qcom_scm-64.c
> +++ b/drivers/firmware/qcom_scm-64.c
> @@ -558,3 +558,35 @@ int __qcom_scm_io_writel(struct device *dev, phys_addr_t addr, unsigned int val)
>  	return qcom_scm_call(dev, QCOM_SCM_SVC_IO, QCOM_SCM_IO_WRITE,
>  			     &desc, &res);
>  }
> +
> +int __qcom_scm_io_readl_atomic(struct device *dev, phys_addr_t addr,
> +			       unsigned int *val)
> +{
> +	struct qcom_scm_desc desc = {0};
> +	struct arm_smccc_res res;
> +	int ret;
> +
> +	desc.args[0] = addr;
> +	desc.arginfo = QCOM_SCM_ARGS(1);
> +
> +	ret = qcom_scm_call_atomic(dev, QCOM_SCM_SVC_IO, QCOM_SCM_IO_READ,
> +				   &desc, &res);
> +	if (ret >= 0)
> +		*val = res.a1;
> +
> +	return ret < 0 ? ret : 0;
> +}
> +
> +int __qcom_scm_io_writel_atomic(struct device *dev, phys_addr_t addr,
> +				unsigned int val)
> +{
> +	struct qcom_scm_desc desc = {0};
> +	struct arm_smccc_res res;
> +
> +	desc.args[0] = addr;
> +	desc.args[1] = val;
> +	desc.arginfo = QCOM_SCM_ARGS(2);
> +
> +	return qcom_scm_call_atomic(dev, QCOM_SCM_SVC_IO, QCOM_SCM_IO_WRITE,
> +				    &desc, &res);
> +}
> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
> index e778af766fae..36da0000b37f 100644
> --- a/drivers/firmware/qcom_scm.c
> +++ b/drivers/firmware/qcom_scm.c
> @@ -365,6 +365,18 @@ int qcom_scm_io_writel(phys_addr_t addr, unsigned int val)
>  }
>  EXPORT_SYMBOL(qcom_scm_io_writel);
>  
> +int qcom_scm_io_readl_atomic(phys_addr_t addr, unsigned int *val)
> +{
> +	return __qcom_scm_io_readl_atomic(__scm->dev, addr, val);
> +}
> +EXPORT_SYMBOL(qcom_scm_io_readl_atomic);
> +
> +int qcom_scm_io_writel_atomic(phys_addr_t addr, unsigned int val)
> +{
> +	return __qcom_scm_io_writel_atomic(__scm->dev, addr, val);
> +}
> +EXPORT_SYMBOL(qcom_scm_io_writel_atomic);
> +
>  static void qcom_scm_set_download_mode(bool enable)
>  {
>  	bool avail;
> diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h
> index dcd7f7917fc7..bb176107f51e 100644
> --- a/drivers/firmware/qcom_scm.h
> +++ b/drivers/firmware/qcom_scm.h
> @@ -37,6 +37,10 @@ extern void __qcom_scm_cpu_power_down(u32 flags);
>  #define QCOM_SCM_IO_WRITE		0x2
>  extern int __qcom_scm_io_readl(struct device *dev, phys_addr_t addr, unsigned int *val);
>  extern int __qcom_scm_io_writel(struct device *dev, phys_addr_t addr, unsigned int val);
> +extern int __qcom_scm_io_readl_atomic(struct device *dev, phys_addr_t addr,
> +				      unsigned int *val);
> +extern int __qcom_scm_io_writel_atomic(struct device *dev, phys_addr_t addr,
> +				       unsigned int val);
>  
>  #define QCOM_SCM_SVC_INFO		0x6
>  #define QCOM_IS_CALL_AVAIL_CMD		0x1
> diff --git a/include/linux/qcom_scm.h b/include/linux/qcom_scm.h
> index 5d65521260b3..6a5d0c98b328 100644
> --- a/include/linux/qcom_scm.h
> +++ b/include/linux/qcom_scm.h
> @@ -64,6 +64,8 @@ extern int qcom_scm_iommu_secure_ptbl_size(u32 spare, size_t *size);
>  extern int qcom_scm_iommu_secure_ptbl_init(u64 addr, u32 size, u32 spare);
>  extern int qcom_scm_io_readl(phys_addr_t addr, unsigned int *val);
>  extern int qcom_scm_io_writel(phys_addr_t addr, unsigned int val);
> +extern int qcom_scm_io_readl_atomic(phys_addr_t addr, unsigned int *val);
> +extern int qcom_scm_io_writel_atomic(phys_addr_t addr, unsigned int val);
>  #else
>  static inline
>  int qcom_scm_set_cold_boot_addr(void *entry, const cpumask_t *cpus)
> @@ -100,5 +102,7 @@ static inline int qcom_scm_iommu_secure_ptbl_size(u32 spare, size_t *size) { ret
>  static inline int qcom_scm_iommu_secure_ptbl_init(u64 addr, u32 size, u32 spare) { return -ENODEV; }
>  static inline int qcom_scm_io_readl(phys_addr_t addr, unsigned int *val) { return -ENODEV; }
>  static inline int qcom_scm_io_writel(phys_addr_t addr, unsigned int val) { return -ENODEV; }
> +static inline int qcom_scm_io_readl_atomic(phys_addr_t addr, unsigned int *val) { return -ENODEV; }
> +static inline int qcom_scm_io_writel_atomic(phys_addr_t addr, unsigned int val) { return -ENODEV; }
>  #endif
>  #endif
> -- 
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
>

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