On Fri, Apr 27, 2018 at 05:44:53PM +0530, Nautiyal, Ankit K wrote:
> From: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
>
> If the user-space does not support aspect-ratio, and requests for a
> modeset with mode having aspect ratio bits set, then the given
> user-mode must be rejected. Secondly, while preparing a user-mode from
> kernel mode, the aspect-ratio info must not be given, if aspect-ratio
> is not supported by the user.
>
> This patch:
> 1. rejects the modes with aspect-ratio info, during modeset, if the
> user does not support aspect ratio.
> 2. does not load the aspect-ratio info in user-mode structure, if
> aspect ratio is not supported.
> 3. adds helper functions for determining if aspect-ratio is expected
> in user-mode and for allowing/disallowing the aspect-ratio, if its
> not expected.
>
> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
>
> V3: Addressed review comments from Ville:
> Do not corrupt the current crtc state by updating aspect-ratio on
> the fly.
> V4: rebase
> V5: As suggested by Ville, rejected the modeset calls for modes with
> aspect ratio, if the user does not set aspect-ratio cap.
> V6: Used the helper functions for determining if aspect-ratio is
> expected in the user-mode.
> V7: rebase
> V8: rebase
> V9: rebase
> v10: Modified the commit-message
> v11: rebase
> v12: Merged the patch for adding aspect-ratio helper functions
> with this patch.
> ---
> drivers/gpu/drm/drm_crtc.c | 8 ++++++++
> drivers/gpu/drm/drm_modes.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
> include/drm/drm_modes.h | 4 ++++
> 3 files changed, 57 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index a231dd5..98323f4 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -449,6 +449,7 @@ int drm_mode_getcrtc(struct drm_device *dev,
> crtc_resp->mode_valid = 0;
> }
> }
> + drm_mode_filter_aspect_ratio_flags(file_priv, &crtc_resp->mode);
> drm_modeset_unlock(&crtc->mutex);
>
> return 0;
> @@ -628,6 +629,13 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
> ret = -ENOMEM;
> goto out;
> }
> + if (!drm_mode_aspect_ratio_allowed(file_priv,
> + &crtc_req->mode)) {
> + DRM_DEBUG_KMS("Unexpected aspect-ratio flag bits\n");
> + ret = -EINVAL;
> + goto out;
> + }
> +
>
> ret = drm_mode_convert_umode(dev, mode, &crtc_req->mode);
> if (ret) {
> diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
> index c395a24..d6f68c8 100644
> --- a/drivers/gpu/drm/drm_modes.c
> +++ b/drivers/gpu/drm/drm_modes.c
> @@ -1759,3 +1759,48 @@ bool drm_mode_is_420(const struct drm_display_info *display,
> drm_mode_is_420_also(display, mode);
> }
> EXPORT_SYMBOL(drm_mode_is_420);
> +
> +/**
> + * drm_mode_aspect_ratio_allowed - checks if the aspect-ratio information
> + * is expected from the user-mode.
> + *
> + * If the user has set aspect-ratio cap, then the flag of the user-mode is
> + * allowed to contain aspect-ratio value.
> + * If the user does not set aspect-ratio cap, then the only value allowed in the
> + * flags bits is aspect-ratio NONE.
> + *
> + * @file_priv: file private structure to get the user capabilities
> + * @umode: drm_mode_modeinfo struct, whose flag carry the aspect ratio
> + * information.
> + *
> + * Returns:
> + * true if the aspect-ratio info is allowed in the user-mode flags.
> + * false, otherwise.
> + */
> +bool
> +drm_mode_aspect_ratio_allowed(const struct drm_file *file_priv,
> + struct drm_mode_modeinfo *umode)
> +{
> + return file_priv->aspect_ratio_allowed || (umode->flags &
> + DRM_MODE_FLAG_PIC_AR_MASK) == DRM_MODE_FLAG_PIC_AR_NONE;
Still looks funny.
> +}
> +
> +/**
> + * drm_mode_filter_aspect_ratio_flags - filters the aspect-ratio bits in the
> + * user-mode flags.
> + *
> + * Checks if the aspect-ratio information is allowed. Resets the aspect-ratio
> + * bits in the user-mode flags, if aspect-ratio info is not allowed.
> + *
> + * @file_priv: file private structure to get the user capabilities.
> + * @umode: drm_mode_modeinfo struct, whose flags' aspect-ratio bits needs to
> + * be filtered.
> + *
> + */
> +void
> +drm_mode_filter_aspect_ratio_flags(const struct drm_file *file_priv,
> + struct drm_mode_modeinfo *umode)
> +{
> + if (!drm_mode_aspect_ratio_allowed(file_priv, umode))
> + umode->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
> +}
> diff --git a/include/drm/drm_modes.h b/include/drm/drm_modes.h
> index 2f78b7e..e0b060d 100644
> --- a/include/drm/drm_modes.h
> +++ b/include/drm/drm_modes.h
> @@ -461,6 +461,10 @@ bool drm_mode_is_420_also(const struct drm_display_info *display,
> const struct drm_display_mode *mode);
> bool drm_mode_is_420(const struct drm_display_info *display,
> const struct drm_display_mode *mode);
> +bool drm_mode_aspect_ratio_allowed(const struct drm_file *file_priv,
> + struct drm_mode_modeinfo *umode);
> +void drm_mode_filter_aspect_ratio_flags(const struct drm_file *file_priv,
> + struct drm_mode_modeinfo *umode);
Since these are no longer exported the prototypes should go into
drivers/gpu/drm/drm_crtc_internal.h
>
> struct drm_display_mode *drm_cvt_mode(struct drm_device *dev,
> int hdisplay, int vdisplay, int vrefresh,
> --
> 2.7.4
--
Ville Syrjälä
Intel
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