> Subject: [PATCH v6 1/5] drm: Define user readable error codes for atomic ioctl
> 
> There can be multiple reasons for a failure in atomic_ioctl. Most often in 
> these
> error conditions -EINVAL is returned. User/Compositor would have to blindly
> take a call on failure of this ioctl so as to use ALLOW_MODESET or any. It 
> would

Or Any ? I think you need to rephrase

> be good if user/compositor gets a readable error code on failure so they can
> take proper corrections in the next commit.
> The struct drm_mode_atomic is being passed by the user/compositor which
> holds the properties for modeset/flip. Reusing the same struct for returning
> the error code in case of failure can save by creating a new uapi/interface 
> for
> returning the error code.

This sentence seems a little weird can you correct this.

> The element 'reserved' in the struct drm_mode_atomic is used for returning
> the user readable error code. This points to the struct

In that case why leave the element name as 'reserved' should that be changed

> drm_mode_atomic_err_code. Failure reasons have been initialized in
> DRM_MODE_ATOMIC_FAILURE_REASON.

I don't see the code for this here.

> 
> Signed-off-by: Arun R Murthy <[email protected]>
> ---
>  include/uapi/drm/drm_mode.h | 41
> +++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 41 insertions(+)
> 
> diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
> index
> 1e0e02a79b5c8db200cf9fd35edfe163d701cbd5..1e9eeae472e74bbd1b5e0b6f7
> 9f9782cafaf5b6e 100644
> --- a/include/uapi/drm/drm_mode.h
> +++ b/include/uapi/drm/drm_mode.h
> @@ -45,6 +45,7 @@ extern "C" {
>  #define DRM_CONNECTOR_NAME_LEN       32
>  #define DRM_DISPLAY_MODE_LEN 32
>  #define DRM_PROP_NAME_LEN    32
> +#define DRM_MODE_ATOMIC_FAILURE_STRING_LEN   128
> 
>  #define DRM_MODE_TYPE_BUILTIN        (1<<0) /* deprecated */
>  #define DRM_MODE_TYPE_CLOCK_C        ((1<<1) | DRM_MODE_TYPE_BUILTIN)
> /* deprecated */
> @@ -1205,6 +1206,46 @@ struct drm_mode_destroy_dumb {
>               DRM_MODE_ATOMIC_NONBLOCK |\
>               DRM_MODE_ATOMIC_ALLOW_MODESET)
> 
> +/**
> + * enum drm_mode_atomic_err_code -  error codes for failures in
> +atomic_ioctl
> + * @DRM_MODE_ATOMIC_INVALID_API_USAGE: invallid API
> usage(DRM_ATOMIC not
> + *                                  enabled, invalid falg, page_flip event
> + *                                  with test-only, etc)
> + * @DRM_MODE_ATOMIC_CRTC_NEED_FULL_MODESET: Need full modeset

Should this be just be CRTC_NEED_MODESET to make it differ from the below 
definition.

> on this
> +crtc
> + * @DRM_MODE_ATOMIC_NEED_FULL_MODESET: Need full modeset on all
> +connected crtc's
> + * @DRM_MODE_ATOMIC_ASYN_NOTSUPP_PLANE: Aync flip not supported

Typos here
* DRM_MODE_ATOMIC_ASYNC_NOT_SUPP_PLANE
* Async

Regards,
Suraj Kandpal

> on this
> +plane
> + * DRM_MODE_ATOMIC_ASYNC_MODIFIER_NOT_SUPP: Modifier not
> supported by
> +async flip
> + * @DRM_MODE_ATOMIC_ASYNC_PROP_CHANGED: Property changed in
> async flip
> +*/ enum drm_mode_atomic_failure_codes {
> +     DRM_MODE_ATOMIC_INVALID_API_USAGE,
> +     DRM_MODE_ATOMIC_CRTC_NEED_FULL_MODESET,
> +     DRM_MODE_ATOMIC_NEED_FULL_MODESET,
> +     DRM_MODE_ATOMIC_ASYNC_NOT_SUPP_PLANE,
> +     DRM_MODE_ATOMIC_ASYNC_MODIFIER_NOT_SUPP,
> +     DRM_MODE_ATOMIC_ASYNC_PROP_CHANGED,
> +};
> +
> +/**
> + * drm_mode_atomic_err_code - struct to store the error code
> + *
> + * pointer to this struct will be stored in reserved variable of
> + * struct drm_mode_atomic to report the failure cause to the user.
> + *
> + * @failure_code: error codes defined in enum
> +drm_moide_atomic_failure_code
> + * @failure_string_ptr: pointer to user readable error message string
> + * @failure_obj_ptr: pointer to the drm_object that caused error
> + * @reserved: reserved for future use
> + * @count_objs: count of drm_objects if multiple drm_objects caused
> +error  */ struct drm_mode_atomic_err_code {
> +     __u64 failure_code;
> +     __u64 failure_objs_ptr;
> +     __u64 reserved;
> +     __u32 count_objs;
> +     char failure_string[DRM_MODE_ATOMIC_FAILURE_STRING_LEN];
> +};
> +
>  struct drm_mode_atomic {
>       __u32 flags;
>       __u32 count_objs;
> 
> --
> 2.25.1

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