linux-kernel - Re: [PATCH v4 2/3] firmware: arm_ffa: Move the ffa_to

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Message-ID: <Z-QvCvGBCtkxNG-e@google.com>
Date: Wed, 26 Mar 2025 16:44:58 +0000
From: Quentin Perret <qperret@...gle.com>
To: Sebastian Ene <sebastianene@...gle.com>
Cc: catalin.marinas@....com, joey.gouly@....com, maz@...nel.org,
	oliver.upton@...ux.dev, snehalreddy@...gle.com,
	sudeep.holla@....com, suzuki.poulose@....com, vdonnefort@...gle.com,
	will@...nel.org, yuzenghui@...wei.com, kvmarm@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel-team@...roid.com
Subject: Re: [PATCH v4 2/3] firmware: arm_ffa: Move the ffa_to_linux
 definition to the ffa header

On Wednesday 26 Mar 2025 at 11:39:00 (+0000), Sebastian Ene wrote:
> Keep the ffa_to_linux error map in the header and move it away
> from the arm ffa driver to make it accessible for other components.
> 
> Signed-off-by: Sebastian Ene <sebastianene@...gle.com>
> Reviewed-by: Sudeep Holla <sudeep.holla@....com>

Reviewed-by: Quentin Perret <qperret@...gle.com>

> ---
>  drivers/firmware/arm_ffa/driver.c | 26 --------------------------
>  include/linux/arm_ffa.h           | 27 +++++++++++++++++++++++++++
>  2 files changed, 27 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
> index 2c2ec3c35f15..3f88509a15b7 100644
> --- a/drivers/firmware/arm_ffa/driver.c
> +++ b/drivers/firmware/arm_ffa/driver.c
> @@ -61,30 +61,6 @@
>  
>  static ffa_fn *invoke_ffa_fn;
>  
> -static const int ffa_linux_errmap[] = {
> -	/* better than switch case as long as return value is continuous */
> -	0,		/* FFA_RET_SUCCESS */
> -	-EOPNOTSUPP,	/* FFA_RET_NOT_SUPPORTED */
> -	-EINVAL,	/* FFA_RET_INVALID_PARAMETERS */
> -	-ENOMEM,	/* FFA_RET_NO_MEMORY */
> -	-EBUSY,		/* FFA_RET_BUSY */
> -	-EINTR,		/* FFA_RET_INTERRUPTED */
> -	-EACCES,	/* FFA_RET_DENIED */
> -	-EAGAIN,	/* FFA_RET_RETRY */
> -	-ECANCELED,	/* FFA_RET_ABORTED */
> -	-ENODATA,	/* FFA_RET_NO_DATA */
> -	-EAGAIN,	/* FFA_RET_NOT_READY */
> -};
> -
> -static inline int ffa_to_linux_errno(int errno)
> -{
> -	int err_idx = -errno;
> -
> -	if (err_idx >= 0 && err_idx < ARRAY_SIZE(ffa_linux_errmap))
> -		return ffa_linux_errmap[err_idx];
> -	return -EINVAL;
> -}
> -
>  struct ffa_pcpu_irq {
>  	struct ffa_drv_info *info;
>  };
> @@ -238,8 +214,6 @@ static int ffa_features(u32 func_feat_id, u32 input_props,
>  	return 0;
>  }
>  
> -#define PARTITION_INFO_GET_RETURN_COUNT_ONLY	BIT(0)
> -
>  /* buffer must be sizeof(struct ffa_partition_info) * num_partitions */
>  static int
>  __ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3,
> diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h
> index 74169dd0f659..cdaa162060f4 100644
> --- a/include/linux/arm_ffa.h
> +++ b/include/linux/arm_ffa.h
> @@ -223,6 +223,9 @@ extern const struct bus_type ffa_bus_type;
>  /* The FF-A 1.0 partition structure lacks the uuid[4] */
>  #define FFA_1_0_PARTITON_INFO_SZ	(8)
>  
> +/* Return the count of partitions deployed in the system */
> +#define PARTITION_INFO_GET_RETURN_COUNT_ONLY	BIT(0)
> +
>  /* FFA transport related */
>  struct ffa_partition_info {
>  	u16 id;
> @@ -475,4 +478,28 @@ struct ffa_ops {
>  	const struct ffa_notifier_ops *notifier_ops;
>  };
>  
> +static const int ffa_linux_errmap[] = {
> +	/* better than switch case as long as return value is continuous */
> +	0,		/* FFA_RET_SUCCESS */
> +	-EOPNOTSUPP,	/* FFA_RET_NOT_SUPPORTED */
> +	-EINVAL,	/* FFA_RET_INVALID_PARAMETERS */
> +	-ENOMEM,	/* FFA_RET_NO_MEMORY */
> +	-EBUSY,		/* FFA_RET_BUSY */
> +	-EINTR,		/* FFA_RET_INTERRUPTED */
> +	-EACCES,	/* FFA_RET_DENIED */
> +	-EAGAIN,	/* FFA_RET_RETRY */
> +	-ECANCELED,	/* FFA_RET_ABORTED */
> +	-ENODATA,	/* FFA_RET_NO_DATA */
> +	-EAGAIN,	/* FFA_RET_NOT_READY */
> +};
> +
> +static inline int ffa_to_linux_errno(int errno)
> +{
> +	int err_idx = -errno;
> +
> +	if (err_idx >= 0 && err_idx < ARRAY_SIZE(ffa_linux_errmap))
> +		return ffa_linux_errmap[err_idx];
> +	return -EINVAL;
> +}
> +
>  #endif /* _LINUX_ARM_FFA_H */
> -- 
> 2.49.0.395.g12beb8f557-goog
>