Re: [PATCH v3 01/24] firmware: arm_scmi: Add new SCMIv4.0 error codes definitions

[Usama Arif <usama.arif@linux.dev>]

On Sun, 29 Mar 2026 17:33:12 +0100 Cristian Marussi <cristian.marussi@arm.com> wrote:

> SCMIv4.0 introduces a couple of new possible protocol error codes: add
> the needed definitions and mappings to Linux error values.
> 
> Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
> ---
>  drivers/firmware/arm_scmi/common.h | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h
> index 7c35c95fddba..44af2018e21d 100644
> --- a/drivers/firmware/arm_scmi/common.h
> +++ b/drivers/firmware/arm_scmi/common.h
> @@ -45,6 +45,8 @@ enum scmi_error_codes {
>  	SCMI_ERR_GENERIC = -8,	/* Generic Error */
>  	SCMI_ERR_HARDWARE = -9,	/* Hardware Error */
>  	SCMI_ERR_PROTOCOL = -10,/* Protocol Error */
> +	SCMI_ERR_IN_USE = -11,  /* In Use Error */
> +	SCMI_ERR_PARTIAL = -12, /* Partial Error */
>  };
>  
>  static const int scmi_linux_errmap[] = {
> @@ -60,6 +62,8 @@ static const int scmi_linux_errmap[] = {
>  	-EIO,			/* SCMI_ERR_GENERIC */
>  	-EREMOTEIO,		/* SCMI_ERR_HARDWARE */
>  	-EPROTO,		/* SCMI_ERR_PROTOCOL */
> +	-EPERM,			/* SCMI_ERR_IN_USE */

"In use" reads like a resource-state failure, where -EBUSY would normally be expected.
-EPERM suggests an authorization failure,  which is already represented by SCMI_ERR_ACCESS.

> +	-EINVAL,		/* SCMI_ERR_PARTIAL */
>  };
>  
>  static inline int scmi_to_linux_errno(int errno)
> -- 
> 2.53.0
> 
>