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List: dri-devel
Subject: Re: [PATCH v4 2/8] drm/atomic: Add support for mouse hotspots
From: Pekka Paalanen <ppaalanen () gmail ! com>
Date: 2023-06-28 7:41:06
Message-ID: 20230628104106.30360b55 () eldfell
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On Wed, 28 Jun 2023 01:21:27 -0400
Zack Rusin <zack@kde.org> wrote:
> From: Zack Rusin <zackr@vmware.com>
>
> Atomic modesetting code lacked support for specifying mouse cursor
> hotspots. The legacy kms DRM_IOCTL_MODE_CURSOR2 had support for setting
> the hotspot but the functionality was not implemented in the new atomic
> paths.
>
> Due to the lack of hotspots in the atomic paths userspace compositors
> completely disable atomic modesetting for drivers that require it (i.e.
> all paravirtualized drivers).
>
> This change adds hotspot properties to the atomic codepaths throughtout
> the DRM core and will allow enabling atomic modesetting for virtualized
> drivers in the userspace.
>
> Signed-off-by: Zack Rusin <zackr@vmware.com>
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Maxime Ripard <mripard@kernel.org>
> Cc: Thomas Zimmermann <tzimmermann@suse.de>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Hi Zack,
I still do not see any UAPI docs for the new properties in this patch?
Thanks,
pq
> ---
> drivers/gpu/drm/drm_atomic_state_helper.c | 14 +++++++
> drivers/gpu/drm/drm_atomic_uapi.c | 20 +++++++++
> drivers/gpu/drm/drm_plane.c | 50 +++++++++++++++++++++++
> include/drm/drm_plane.h | 14 +++++++
> 4 files changed, 98 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c \
> b/drivers/gpu/drm/drm_atomic_state_helper.c index \
> 784e63d70a42..54975de44a0e 100644
> --- a/drivers/gpu/drm/drm_atomic_state_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_state_helper.c
> @@ -275,6 +275,20 @@ void __drm_atomic_helper_plane_state_reset(struct \
> drm_plane_state *plane_state, plane_state->normalized_zpos = val;
> }
> }
> +
> + if (plane->hotspot_x_property) {
> + if (!drm_object_property_get_default_value(&plane->base,
> + plane->hotspot_x_property,
> + &val))
> + plane_state->hotspot_x = val;
> + }
> +
> + if (plane->hotspot_y_property) {
> + if (!drm_object_property_get_default_value(&plane->base,
> + plane->hotspot_y_property,
> + &val))
> + plane_state->hotspot_y = val;
> + }
> }
> EXPORT_SYMBOL(__drm_atomic_helper_plane_state_reset);
>
> diff --git a/drivers/gpu/drm/drm_atomic_uapi.c \
> b/drivers/gpu/drm/drm_atomic_uapi.c index 98d3b10c08ae..07a7b3f18df2 \
> 100644
> --- a/drivers/gpu/drm/drm_atomic_uapi.c
> +++ b/drivers/gpu/drm/drm_atomic_uapi.c
> @@ -593,6 +593,22 @@ static int drm_atomic_plane_set_property(struct \
> drm_plane *plane, } else if (plane->funcs->atomic_set_property) {
> return plane->funcs->atomic_set_property(plane, state,
> property, val);
> + } else if (property == plane->hotspot_x_property) {
> + if (plane->type != DRM_PLANE_TYPE_CURSOR) {
> + drm_dbg_atomic(plane->dev,
> + "[PLANE:%d:%s] is not a cursor plane: 0x%llx\n",
> + plane->base.id, plane->name, val);
> + return -EINVAL;
> + }
> + state->hotspot_x = val;
> + } else if (property == plane->hotspot_y_property) {
> + if (plane->type != DRM_PLANE_TYPE_CURSOR) {
> + drm_dbg_atomic(plane->dev,
> + "[PLANE:%d:%s] is not a cursor plane: 0x%llx\n",
> + plane->base.id, plane->name, val);
> + return -EINVAL;
> + }
> + state->hotspot_y = val;
> } else {
> drm_dbg_atomic(plane->dev,
> "[PLANE:%d:%s] unknown property [PROP:%d:%s]\n",
> @@ -653,6 +669,10 @@ drm_atomic_plane_get_property(struct drm_plane \
> *plane,
> *val = state->scaling_filter;
> } else if (plane->funcs->atomic_get_property) {
> return plane->funcs->atomic_get_property(plane, state, property, val);
> + } else if (property == plane->hotspot_x_property) {
> + *val = state->hotspot_x;
> + } else if (property == plane->hotspot_y_property) {
> + *val = state->hotspot_y;
> } else {
> drm_dbg_atomic(dev,
> "[PLANE:%d:%s] unknown property [PROP:%d:%s]\n",
> diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
> index c6bbb0c209f4..eaca367bdc7e 100644
> --- a/drivers/gpu/drm/drm_plane.c
> +++ b/drivers/gpu/drm/drm_plane.c
> @@ -230,6 +230,47 @@ static int create_in_format_blob(struct drm_device \
> *dev, struct drm_plane *plane return 0;
> }
>
> +/**
> + * drm_plane_create_hotspot_properties - creates the mouse hotspot
> + * properties and attaches them to the given cursor plane
> + *
> + * @plane: drm cursor plane
> + *
> + * This function enables the mouse hotspot property on a given
> + * cursor plane.
> + *
> + * RETURNS:
> + * Zero for success or -errno
> + */
> +static int drm_plane_create_hotspot_properties(struct drm_plane *plane)
> +{
> + struct drm_property *prop_x;
> + struct drm_property *prop_y;
> +
> + drm_WARN_ON(plane->dev,
> + !drm_core_check_feature(plane->dev,
> + DRIVER_CURSOR_HOTSPOT));
> +
> + prop_x = drm_property_create_signed_range(plane->dev, 0, "HOTSPOT_X",
> + INT_MIN, INT_MAX);
> + if (IS_ERR(prop_x))
> + return PTR_ERR(prop_x);
> +
> + prop_y = drm_property_create_signed_range(plane->dev, 0, "HOTSPOT_Y",
> + INT_MIN, INT_MAX);
> + if (IS_ERR(prop_y)) {
> + drm_property_destroy(plane->dev, prop_x);
> + return PTR_ERR(prop_y);
> + }
> +
> + drm_object_attach_property(&plane->base, prop_x, 0);
> + drm_object_attach_property(&plane->base, prop_y, 0);
> + plane->hotspot_x_property = prop_x;
> + plane->hotspot_y_property = prop_y;
> +
> + return 0;
> +}
> +
> __printf(9, 0)
> static int __drm_universal_plane_init(struct drm_device *dev,
> struct drm_plane *plane,
> @@ -348,6 +389,10 @@ static int __drm_universal_plane_init(struct \
> drm_device *dev, drm_object_attach_property(&plane->base, \
> config->prop_src_w, 0); drm_object_attach_property(&plane->base, \
> config->prop_src_h, 0); }
> + if (drm_core_check_feature(dev, DRIVER_CURSOR_HOTSPOT) &&
> + type == DRM_PLANE_TYPE_CURSOR) {
> + drm_plane_create_hotspot_properties(plane);
> + }
>
> if (format_modifier_count)
> create_in_format_blob(dev, plane);
> @@ -1067,6 +1112,11 @@ static int drm_mode_cursor_universal(struct \
> drm_crtc *crtc,
> fb->hot_x = req->hot_x;
> fb->hot_y = req->hot_y;
> +
> + if (plane->hotspot_x_property && plane->state)
> + plane->state->hotspot_x = req->hot_x;
> + if (plane->hotspot_y_property && plane->state)
> + plane->state->hotspot_y = req->hot_y;
> } else {
> fb = NULL;
> }
> diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
> index 51291983ea44..74e62f90a1ad 100644
> --- a/include/drm/drm_plane.h
> +++ b/include/drm/drm_plane.h
> @@ -116,6 +116,10 @@ struct drm_plane_state {
> /** @src_h: height of visible portion of plane (in 16.16) */
> uint32_t src_h, src_w;
>
> + /** @hotspot_x: x offset to mouse cursor hotspot */
> + /** @hotspot_y: y offset to mouse cursor hotspot */
> + int32_t hotspot_x, hotspot_y;
> +
> /**
> * @alpha:
> * Opacity of the plane with 0 as completely transparent and 0xffff as
> @@ -748,6 +752,16 @@ struct drm_plane {
> * scaling.
> */
> struct drm_property *scaling_filter_property;
> +
> + /**
> + * @hotspot_x_property: property to set mouse hotspot x offset.
> + */
> + struct drm_property *hotspot_x_property;
> +
> + /**
> + * @hotspot_y_property: property to set mouse hotspot y offset.
> + */
> + struct drm_property *hotspot_y_property;
> };
>
> #define obj_to_plane(x) container_of(x, struct drm_plane, base)
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