diff options
Diffstat (limited to 'drivers/gpu/drm/vkms/vkms_drv.h')
| -rw-r--r-- | drivers/gpu/drm/vkms/vkms_drv.h | 101 |
1 files changed, 88 insertions, 13 deletions
diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h index 5e46ea5b96dc..672fe191e239 100644 --- a/drivers/gpu/drm/vkms/vkms_drv.h +++ b/drivers/gpu/drm/vkms/vkms_drv.h @@ -25,6 +25,17 @@ #define VKMS_LUT_SIZE 256 +/** + * struct vkms_frame_info - Structure to store the state of a frame + * + * @fb: backing drm framebuffer + * @src: source rectangle of this frame in the source framebuffer, stored in 16.16 fixed-point form + * @dst: destination rectangle in the crtc buffer, stored in whole pixel units + * @map: see @drm_shadow_plane_state.data + * @rotation: rotation applied to the source. + * + * @src and @dst should have the same size modulo the rotation. + */ struct vkms_frame_info { struct drm_framebuffer *fb; struct drm_rect src, dst; @@ -52,9 +63,11 @@ struct vkms_writeback_job { }; /** - * vkms_plane_state - Driver specific plane state + * struct vkms_plane_state - Driver specific plane state * @base: base plane state * @frame_info: data required for composing computation + * @pixel_read: function to read a pixel in this plane. The creator of a struct vkms_plane_state + * must ensure that this pointer is valid */ struct vkms_plane_state { struct drm_shadow_plane_state base; @@ -73,29 +86,56 @@ struct vkms_color_lut { }; /** - * vkms_crtc_state - Driver specific CRTC state + * struct vkms_crtc_state - Driver specific CRTC state + * * @base: base CRTC state * @composer_work: work struct to compose and add CRC entries - * @n_frame_start: start frame number for computed CRC - * @n_frame_end: end frame number for computed CRC + * + * @num_active_planes: Number of active planes + * @active_planes: List containing all the active planes (counted by + * @num_active_planes). They should be stored in z-order. + * @active_writeback: Current active writeback job + * @gamma_lut: Look up table for gamma used in this CRTC + * @crc_pending: Protected by @vkms_output.composer_lock, true when the frame CRC is not computed + * yet. Used by vblank to detect if the composer is too slow. + * @wb_pending: Protected by @vkms_output.composer_lock, true when a writeback frame is requested. + * @frame_start: Protected by @vkms_output.composer_lock, saves the frame number before the start + * of the composition process. + * @frame_end: Protected by @vkms_output.composer_lock, saves the last requested frame number. + * This is used to generate enough CRC entries when the composition worker is too slow. */ struct vkms_crtc_state { struct drm_crtc_state base; struct work_struct composer_work; int num_active_planes; - /* stack of active planes for crc computation, should be in z order */ struct vkms_plane_state **active_planes; struct vkms_writeback_job *active_writeback; struct vkms_color_lut gamma_lut; - /* below four are protected by vkms_output.composer_lock */ bool crc_pending; bool wb_pending; u64 frame_start; u64 frame_end; }; +/** + * struct vkms_output - Internal representation of all output components in VKMS + * + * @crtc: Base CRTC in DRM + * @encoder: DRM encoder used for this output + * @connector: DRM connector used for this output + * @wb_connecter: DRM writeback connector used for this output + * @vblank_hrtimer: Timer used to trigger the vblank + * @period_ns: vblank period, in nanoseconds, used to configure @vblank_hrtimer and to compute + * vblank timestamps + * @composer_workq: Ordered workqueue for @composer_state.composer_work. + * @lock: Lock used to protect concurrent access to the composer + * @composer_enabled: Protected by @lock, true when the VKMS composer is active (crc needed or + * writeback) + * @composer_state: Protected by @lock, current state of this VKMS output + * @composer_lock: Lock used internally to protect @composer_state members + */ struct vkms_output { struct drm_crtc crtc; struct drm_encoder encoder; @@ -103,28 +143,38 @@ struct vkms_output { struct drm_writeback_connector wb_connector; struct hrtimer vblank_hrtimer; ktime_t period_ns; - /* ordered wq for composer_work */ struct workqueue_struct *composer_workq; - /* protects concurrent access to composer */ spinlock_t lock; - /* protected by @lock */ bool composer_enabled; struct vkms_crtc_state *composer_state; spinlock_t composer_lock; }; -struct vkms_device; - +/** + * struct vkms_config - General configuration for VKMS driver + * + * @writeback: If true, a writeback buffer can be attached to the CRTC + * @cursor: If true, a cursor plane is created in the VKMS device + * @overlay: If true, NUM_OVERLAY_PLANES will be created for the VKMS device + * @dev: Used to store the current VKMS device. Only set when the device is instantiated. + */ struct vkms_config { bool writeback; bool cursor; bool overlay; - /* only set when instantiated */ struct vkms_device *dev; }; +/** + * struct vkms_device - Description of a VKMS device + * + * @drm - Base device in DRM + * @platform - Associated platform device + * @output - Configuration and sub-components of the VKMS device + * @config: Configuration used in this VKMS device + */ struct vkms_device { struct drm_device drm; struct platform_device *platform; @@ -132,6 +182,10 @@ struct vkms_device { const struct vkms_config *config; }; +/* + * The following helpers are used to convert a member of a struct into its parent. + */ + #define drm_crtc_to_vkms_output(target) \ container_of(target, struct vkms_output, crtc) @@ -144,12 +198,33 @@ struct vkms_device { #define to_vkms_plane_state(target)\ container_of(target, struct vkms_plane_state, base.base) -/* CRTC */ +/** + * vkms_crtc_init() - Initialize a CRTC for VKMS + * @dev: DRM device associated with the VKMS buffer + * @crtc: uninitialized CRTC device + * @primary: primary plane to attach to the CRTC + * @cursor: plane to attach to the CRTC + */ int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc, struct drm_plane *primary, struct drm_plane *cursor); +/** + * vkms_output_init() - Initialize all sub-components needed for a VKMS device. + * + * @vkmsdev: VKMS device to initialize + * @index: CRTC which can be attached to the planes. The caller must ensure that + * @index is positive and less or equals to 31. + */ int vkms_output_init(struct vkms_device *vkmsdev, int index); +/** + * vkms_plane_init() - Initialize a plane + * + * @vkmsdev: VKMS device containing the plane + * @type: type of plane to initialize + * @index: CRTC which can be attached to the plane. The caller must ensure that + * @index is positive and less or equals to 31. + */ struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev, enum drm_plane_type type, int index); |