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SubjectRe: [PATCH 1/2] drm/vkms: Use index instead of 0 in possible crtc
On Thu, Jun 06, 2019 at 07:40:38PM -0300, Rodrigo Siqueira wrote:
> When vkms calls drm_universal_plane_init(), it sets 0 for the
> possible_crtcs parameter which works well for a single encoder and
> connector; however, this approach is not flexible and does not fit well
> for vkms. This commit adds an index parameter for vkms_plane_init()
> which makes code flexible and enables vkms to support other DRM features.
>
> Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>

I think a core patch to WARN_ON if this is NULL would be good. Since
that's indeed a bit broken ... We'd need to check all callers to make sure
there's not other such bugs anywhere ofc.
-Daniel

> ---
> drivers/gpu/drm/vkms/vkms_drv.c | 2 +-
> drivers/gpu/drm/vkms/vkms_drv.h | 4 ++--
> drivers/gpu/drm/vkms/vkms_output.c | 6 +++---
> drivers/gpu/drm/vkms/vkms_plane.c | 4 ++--
> 4 files changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
> index 738dd6206d85..92296bd8f623 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.c
> +++ b/drivers/gpu/drm/vkms/vkms_drv.c
> @@ -92,7 +92,7 @@ static int vkms_modeset_init(struct vkms_device *vkmsdev)
> dev->mode_config.max_height = YRES_MAX;
> dev->mode_config.preferred_depth = 24;
>
> - return vkms_output_init(vkmsdev);
> + return vkms_output_init(vkmsdev, 0);
> }
>
> static int __init vkms_init(void)
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
> index 81f1cfbeb936..e81073dea154 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.h
> +++ b/drivers/gpu/drm/vkms/vkms_drv.h
> @@ -113,10 +113,10 @@ bool vkms_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
> int *max_error, ktime_t *vblank_time,
> bool in_vblank_irq);
>
> -int vkms_output_init(struct vkms_device *vkmsdev);
> +int vkms_output_init(struct vkms_device *vkmsdev, int index);
>
> struct drm_plane *vkms_plane_init(struct vkms_device *vkmsdev,
> - enum drm_plane_type type);
> + enum drm_plane_type type, int index);
>
> /* Gem stuff */
> struct drm_gem_object *vkms_gem_create(struct drm_device *dev,
> diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c
> index 3b162b25312e..1442b447c707 100644
> --- a/drivers/gpu/drm/vkms/vkms_output.c
> +++ b/drivers/gpu/drm/vkms/vkms_output.c
> @@ -36,7 +36,7 @@ static const struct drm_connector_helper_funcs vkms_conn_helper_funcs = {
> .get_modes = vkms_conn_get_modes,
> };
>
> -int vkms_output_init(struct vkms_device *vkmsdev)
> +int vkms_output_init(struct vkms_device *vkmsdev, int index)
> {
> struct vkms_output *output = &vkmsdev->output;
> struct drm_device *dev = &vkmsdev->drm;
> @@ -46,12 +46,12 @@ int vkms_output_init(struct vkms_device *vkmsdev)
> struct drm_plane *primary, *cursor = NULL;
> int ret;
>
> - primary = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_PRIMARY);
> + primary = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_PRIMARY, index);
> if (IS_ERR(primary))
> return PTR_ERR(primary);
>
> if (enable_cursor) {
> - cursor = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_CURSOR);
> + cursor = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_CURSOR, index);
> if (IS_ERR(cursor)) {
> ret = PTR_ERR(cursor);
> goto err_cursor;
> diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
> index 0e67d2d42f0c..20ffc52f9194 100644
> --- a/drivers/gpu/drm/vkms/vkms_plane.c
> +++ b/drivers/gpu/drm/vkms/vkms_plane.c
> @@ -168,7 +168,7 @@ static const struct drm_plane_helper_funcs vkms_primary_helper_funcs = {
> };
>
> struct drm_plane *vkms_plane_init(struct vkms_device *vkmsdev,
> - enum drm_plane_type type)
> + enum drm_plane_type type, int index)
> {
> struct drm_device *dev = &vkmsdev->drm;
> const struct drm_plane_helper_funcs *funcs;
> @@ -190,7 +190,7 @@ struct drm_plane *vkms_plane_init(struct vkms_device *vkmsdev,
> funcs = &vkms_primary_helper_funcs;
> }
>
> - ret = drm_universal_plane_init(dev, plane, 0,
> + ret = drm_universal_plane_init(dev, plane, 1 << index,
> &vkms_plane_funcs,
> formats, nformats,
> NULL, type, NULL);
> --
> 2.21.0



--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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