[PATCH 06/18] drm/vmwgfx: Add a new interface for plane update on a display unit

[Deepak Rawat <drawat@vmware.com>]

Add a new struct vmw_du_update_plane similar to vmw_kms_dirty which
represent the flow of operations needed to update a display unit from
surface or bo (blit a new framebuffer).

v2:
- Kernel doc correction.
- Rebase.

Signed-off-by: Deepak Rawat <drawat@vmware.com>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c |  99 ++++++++++++++++++++++
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.h | 125 ++++++++++++++++++++++++++++
 2 files changed, 224 insertions(+)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
index 292e48feba83..8a0b31f1b89b 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -30,6 +30,7 @@
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_rect.h>
+#include <drm/drm_damage_helper.h>
 
 /* Might need a hrtimer here? */
 #define VMWGFX_PRESENT_RATE ((HZ / 60 > 0) ? HZ / 60 : 1)
@@ -3092,3 +3093,101 @@ void vmw_kms_lost_device(struct drm_device *dev)
 {
 	drm_atomic_helper_shutdown(dev);
 }
+
+/**
+ * vmw_du_helper_plane_update - Helper to do plane update on a display unit.
+ * @update: The closure structure.
+ *
+ * Call this helper after setting callbacks in &vmw_du_update_plane to do plane
+ * update on display unit.
+ *
+ * RETURNS: 0 on success or a negative error code on failure.
+ */
+int vmw_du_helper_plane_update(struct vmw_du_update_plane *update)
+{
+	struct drm_plane_state *state = update->plane->state;
+	struct drm_plane_state *old_state = update->old_state;
+	struct drm_atomic_helper_damage_iter iter;
+	struct drm_rect clip;
+	struct drm_rect bb;
+	uint32_t reserved_size = 0;
+	uint32_t submit_size = 0;
+	uint32_t curr_size = 0;
+	uint32_t num_hits = 0;
+	void *cmd_start;
+	char *cmd_next;
+	int ret;
+
+	/*
+	 * Iterate in advance to check if really need plane update and find the
+	 * number of clips that actually are in plane src for fifo allocation.
+	 */
+	drm_atomic_helper_damage_iter_init(&iter, old_state, state);
+	drm_atomic_for_each_plane_damage(&iter, &clip)
+		num_hits++;
+
+	if (num_hits == 0)
+		return 0;
+
+	ret = update->prepare(update);
+	if (ret) {
+		DRM_ERROR("Failed to validate FB for command submission\n");
+		return ret;
+	}
+
+	reserved_size = update->calc_fifo_size(update, num_hits);
+	cmd_start = vmw_fifo_reserve(update->dev_priv, reserved_size);
+	if (!cmd_start) {
+		DRM_ERROR("Failed to allocate FIFO space for plane update\n");
+		update->revert(update);
+		return -ENOMEM;
+	}
+	cmd_next = cmd_start;
+
+	if (update->post_prepare) {
+		curr_size = update->post_prepare(update, cmd_next);
+		cmd_next += curr_size;
+		submit_size += curr_size;
+	}
+
+	if (update->pre_clip) {
+		curr_size = update->pre_clip(update, cmd_next, num_hits);
+		cmd_next += curr_size;
+		submit_size += curr_size;
+	}
+
+	bb.x1 = INT_MAX;
+	bb.y1 = INT_MAX;
+	bb.x2 = INT_MIN;
+	bb.y2 = INT_MIN;
+
+	drm_atomic_helper_damage_iter_init(&iter, old_state, state);
+	drm_atomic_for_each_plane_damage(&iter, &clip) {
+		uint32_t fb_x = clip.x1;
+		uint32_t fb_y = clip.y1;
+
+		vmw_du_translate_to_crtc(state, &clip);
+		if (update->clip) {
+			curr_size = update->clip(update, cmd_next, &clip, fb_x,
+						 fb_y);
+			cmd_next += curr_size;
+			submit_size += curr_size;
+		}
+		bb.x1 = min_t(int, bb.x1, clip.x1);
+		bb.y1 = min_t(int, bb.y1, clip.y1);
+		bb.x2 = max_t(int, bb.x2, clip.x2);
+		bb.y2 = max_t(int, bb.y2, clip.y2);
+	}
+
+	curr_size = update->post_clip(update, cmd_next, &bb);
+	submit_size += curr_size;
+
+	if (reserved_size < submit_size)
+		submit_size = 0;
+
+	vmw_fifo_commit(update->dev_priv, submit_size);
+
+	update->finish(update);
+
+	return ret;
+}
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.h b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.h
index 31311298ec0b..26cad7e73afa 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.h
@@ -33,7 +33,115 @@
 #include <drm/drm_encoder.h>
 #include "vmwgfx_drv.h"
 
+/**
+ * struct vmw_du_update_plane - Closure structure for vmw_du_helper_plane_update
+ * @plane: Plane which is being updated.
+ * @old_state: Old state of plane.
+ * @dev_priv: Device private.
+ * @du: Display unit on which to update the plane.
+ * @vfb: Framebuffer which is blitted to display unit.
+ * @out_fence: Out fence for resource finish. (optional)
+ *
+ * This structure loosely represent the set of operations needed to perform a
+ * plane update on a display unit. Implementer will define that functionality
+ * according to the function callbacks for this structure. In brief it involves
+ * surface/buffer object validation, populate FIFO commands and command
+ * submission to the device.
+ */
+struct vmw_du_update_plane {
+	/**
+	 * @prepare: Resource preparation and validation.
+	 *
+	 * This callback should be called to prepare the surface resource or the
+	 * buffer object to validate it before command submission.
+	 *
+	 * RETURNS: 0 on success or a negative error code on failure.
+	 */
+	int (*prepare)(struct vmw_du_update_plane *update);
 
+	/**
+	 * @calc_fifo_size: Calculate fifo size.
+	 *
+	 * Determine fifo size for the commands needed for update. The number of
+	 * damage clips on display unit @num_hits will be passed to allocate
+	 * sufficient fifo space.
+	 *
+	 * RETURNS: Fifo size needed
+	 */
+	uint32_t (*calc_fifo_size)(struct vmw_du_update_plane *update,
+				   uint32_t num_hits);
+
+	/**
+	 * @post_prepare: Populate fifo for resource preparation.
+	 *
+	 * Some surface resource or buffer object need some extra cmd submission
+	 * like update GB image for proxy surface and define a GMRFB for screen
+	 * object. That should should be done here as this callback will be
+	 * called after FIFO allocation with the address of command buufer.
+	 *
+	 * This callback is optional.
+	 *
+	 * RETURNS: Size of commands populated to command buffer.
+	 */
+	uint32_t (*post_prepare)(struct vmw_du_update_plane *update, void *cmd);
+
+	/**
+	 * @pre_clip: Populate fifo before clip.
+	 *
+	 * This is where pre clip related command should be populated like
+	 * surface copy/DMA, etc.
+	 *
+	 * This callback is optional.
+	 *
+	 * RETURNS: Size of commands populated to command buffer.
+	 */
+	uint32_t (*pre_clip)(struct vmw_du_update_plane *update, void *cmd,
+			     uint32_t num_hits);
+
+	/**
+	 * @clip: Populate fifo for clip.
+	 *
+	 * This is where to populate clips for surface copy/dma or blit commands
+	 * if needed. This will be called times have damage in display unit,
+	 * which is one if doing full update. @clip is the damage in destination
+	 * coordinates which is crtc/DU and @src_x, @src_y is damage clip src in
+	 * framebuffer coordinate.
+	 *
+	 * This callback is optional.
+	 *
+	 * RETURNS: Size of commands populated to command buffer.
+	 */
+	uint32_t (*clip)(struct vmw_du_update_plane *update, void *cmd,
+			 struct drm_rect *clip, uint32_t src_x, uint32_t src_y);
+
+	/**
+	 * @post_clip: Populate fifo after clip.
+	 *
+	 * This is where to populate display unit update commands or blit
+	 * commands.
+	 *
+	 * RETURNS: Size of commands populated to command buffer.
+	 */
+	uint32_t (*post_clip)(struct vmw_du_update_plane *update, void *cmd,
+				    struct drm_rect *bb);
+
+	/**
+	 * @finish: Finish surface resource or buffer object.
+	 */
+	void (*finish)(struct vmw_du_update_plane *update);
+
+	/**
+	 * @revert: Revert surface resource or buffer object in case of failure.
+	 */
+	void (*revert)(struct vmw_du_update_plane *update);
+
+	struct drm_plane *plane;
+	struct drm_plane_state *old_state;
+	struct vmw_private *dev_priv;
+	struct vmw_display_unit *du;
+	struct vmw_framebuffer *vfb;
+	struct vmw_fence_obj **out_fence;
+};
 
 /**
  * struct vmw_kms_dirty - closure structure for the vmw_kms_helper_dirty
@@ -470,4 +578,21 @@ int vmw_kms_stdu_dma(struct vmw_private *dev_priv,
 
 int vmw_kms_set_config(struct drm_mode_set *set,
 		       struct drm_modeset_acquire_ctx *ctx);
+
+int vmw_du_helper_plane_update(struct vmw_du_update_plane *update);
+
+/**
+ * vmw_du_translate_to_crtc - Translate a rect from framebuffer to crtc
+ * @state: Plane state.
+ * @r: Rectangle to translate.
+ */
+static inline void vmw_du_translate_to_crtc(struct drm_plane_state *state,
+					    struct drm_rect *r)
+{
+	int translate_crtc_x = -((state->src_x >> 16) - state->crtc_x);
+	int translate_crtc_y = -((state->src_y >> 16) - state->crtc_y);
+
+	drm_rect_translate(r, translate_crtc_x, translate_crtc_y);
+}
+
 #endif
-- 
2.17.1

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