[PATCH] drm/qxl: reapply cursor after resetting primary

[Ray Strode <halfline@gmail.com>]

From: Ray Strode <rstrode@redhat.com>

QXL associates mouse state with its primary plane.

Destroying a primary plane and putting a new one in place has the side
effect of destroying the cursor as well.

This commit changes the driver to reapply the cursor any time a new
primary is created. It achieves this by keeping a reference to the
cursor bo on the qxl_crtc struct.

This fix is very similar to

commit 4532b241a4b7 ("drm/qxl: reapply cursor after SetCrtc calls")

which got implicitly reverted as part of implementing the atomic
modeset feature.

Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Dave Airlie <airlied@redhat.com>
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1512097
Fixes: 1277eed5fecb ("drm: qxl: Atomic phase 1: convert cursor to universal plane")
Signed-off-by: Ray Strode <rstrode@redhat.com>
---
 drivers/gpu/drm/qxl/qxl_display.c | 59 +++++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/qxl/qxl_drv.h     |  2 ++
 2 files changed, 61 insertions(+)

diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
index fc9e86f3811f..a51a5abb977d 100644
--- a/drivers/gpu/drm/qxl/qxl_display.c
+++ b/drivers/gpu/drm/qxl/qxl_display.c
@@ -262,60 +262,61 @@ static int qxl_add_common_modes(struct drm_connector *connector,
 		mode = drm_cvt_mode(dev, common_modes[i].w, common_modes[i].h,
 				    60, false, false, false);
 		if (common_modes[i].w == pwidth && common_modes[i].h == pheight)
 			mode->type |= DRM_MODE_TYPE_PREFERRED;
 		drm_mode_probed_add(connector, mode);
 	}
 	return i - 1;
 }
 
 static void qxl_crtc_atomic_flush(struct drm_crtc *crtc,
 				  struct drm_crtc_state *old_crtc_state)
 {
 	struct drm_device *dev = crtc->dev;
 	struct drm_pending_vblank_event *event;
 	unsigned long flags;
 
 	if (crtc->state && crtc->state->event) {
 		event = crtc->state->event;
 		crtc->state->event = NULL;
 
 		spin_lock_irqsave(&dev->event_lock, flags);
 		drm_crtc_send_vblank_event(crtc, event);
 		spin_unlock_irqrestore(&dev->event_lock, flags);
 	}
 }
 
 static void qxl_crtc_destroy(struct drm_crtc *crtc)
 {
 	struct qxl_crtc *qxl_crtc = to_qxl_crtc(crtc);
 
+	qxl_bo_unref(&qxl_crtc->cursor_bo);
 	drm_crtc_cleanup(crtc);
 	kfree(qxl_crtc);
 }
 
 static const struct drm_crtc_funcs qxl_crtc_funcs = {
 	.set_config = drm_atomic_helper_set_config,
 	.destroy = qxl_crtc_destroy,
 	.page_flip = drm_atomic_helper_page_flip,
 	.reset = drm_atomic_helper_crtc_reset,
 	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
 };
 
 void qxl_user_framebuffer_destroy(struct drm_framebuffer *fb)
 {
 	struct qxl_framebuffer *qxl_fb = to_qxl_framebuffer(fb);
 	struct qxl_bo *bo = gem_to_qxl_bo(qxl_fb->obj);
 
 	WARN_ON(bo->shadow);
 	drm_gem_object_unreference_unlocked(qxl_fb->obj);
 	drm_framebuffer_cleanup(fb);
 	kfree(qxl_fb);
 }
 
 static int qxl_framebuffer_surface_dirty(struct drm_framebuffer *fb,
 					 struct drm_file *file_priv,
 					 unsigned flags, unsigned color,
 					 struct drm_clip_rect *clips,
 					 unsigned num_clips)
 {
@@ -468,193 +469,251 @@ static void qxl_crtc_atomic_disable(struct drm_crtc *crtc,
 
 static const struct drm_crtc_helper_funcs qxl_crtc_helper_funcs = {
 	.mode_fixup = qxl_crtc_mode_fixup,
 	.mode_set_nofb = qxl_mode_set_nofb,
 	.atomic_flush = qxl_crtc_atomic_flush,
 	.atomic_enable = qxl_crtc_atomic_enable,
 	.atomic_disable = qxl_crtc_atomic_disable,
 };
 
 static int qxl_primary_atomic_check(struct drm_plane *plane,
 				    struct drm_plane_state *state)
 {
 	struct qxl_device *qdev = plane->dev->dev_private;
 	struct qxl_framebuffer *qfb;
 	struct qxl_bo *bo;
 
 	if (!state->crtc || !state->fb)
 		return 0;
 
 	qfb = to_qxl_framebuffer(state->fb);
 	bo = gem_to_qxl_bo(qfb->obj);
 
 	if (bo->surf.stride * bo->surf.height > qdev->vram_size) {
 		DRM_ERROR("Mode doesn't fit in vram size (vgamem)");
 		return -EINVAL;
 	}
 
 	return 0;
 }
 
+static int qxl_primary_apply_cursor(struct drm_plane *plane)
+{
+	struct drm_device *dev = plane->dev;
+	struct qxl_device *qdev = dev->dev_private;
+	struct drm_framebuffer *fb = plane->state->fb;
+	struct qxl_crtc *qcrtc = to_qxl_crtc(plane->state->crtc);
+	struct qxl_cursor_cmd *cmd;
+	struct qxl_release *release;
+	int ret = 0;
+
+	if (!qcrtc->cursor_bo)
+		return 0;
+
+	ret = qxl_alloc_release_reserved(qdev, sizeof(*cmd),
+					 QXL_RELEASE_CURSOR_CMD,
+					 &release, NULL);
+	if (ret)
+		return ret;
+
+	ret = qxl_release_list_add(release, qcrtc->cursor_bo);
+	if (ret)
+		goto out_free_release;
+
+	ret = qxl_release_reserve_list(release, false);
+	if (ret)
+		goto out_free_release;
+
+	cmd = (struct qxl_cursor_cmd *)qxl_release_map(qdev, release);
+	cmd->type = QXL_CURSOR_SET;
+	cmd->u.set.position.x = plane->state->crtc_x + fb->hot_x;
+	cmd->u.set.position.y = plane->state->crtc_y + fb->hot_y;
+
+	cmd->u.set.shape = qxl_bo_physical_address(qdev, qcrtc->cursor_bo, 0);
+
+	cmd->u.set.visible = 1;
+	qxl_release_unmap(qdev, release, &cmd->release_info);
+
+	qxl_push_cursor_ring_release(qdev, release, QXL_CMD_CURSOR, false);
+	qxl_release_fence_buffer_objects(release);
+
+	return ret;
+
+out_free_release:
+	qxl_release_free(qdev, release);
+	return ret;
+}
+
 static void qxl_primary_atomic_update(struct drm_plane *plane,
 				      struct drm_plane_state *old_state)
 {
 	struct qxl_device *qdev = plane->dev->dev_private;
 	struct qxl_framebuffer *qfb =
 		to_qxl_framebuffer(plane->state->fb);
 	struct qxl_framebuffer *qfb_old;
 	struct qxl_bo *bo = gem_to_qxl_bo(qfb->obj);
 	struct qxl_bo *bo_old;
 	struct drm_clip_rect norect = {
 	    .x1 = 0,
 	    .y1 = 0,
 	    .x2 = qfb->base.width,
 	    .y2 = qfb->base.height
 	};
+	int ret;
 	bool same_shadow = false;
 
 	if (old_state->fb) {
 		qfb_old = to_qxl_framebuffer(old_state->fb);
 		bo_old = gem_to_qxl_bo(qfb_old->obj);
 	} else {
 		bo_old = NULL;
 	}
 
 	if (bo == bo_old)
 		return;
 
 	if (bo_old && bo_old->shadow && bo->shadow &&
 	    bo_old->shadow == bo->shadow) {
 		same_shadow = true;
 	}
 
 	if (bo_old && bo_old->is_primary) {
 		if (!same_shadow)
 			qxl_io_destroy_primary(qdev);
 		bo_old->is_primary = false;
+
+		ret = qxl_primary_apply_cursor(plane);
+		if (ret)
+			DRM_ERROR(
+			"could not set cursor after creating primary");
 	}
 
 	if (!bo->is_primary) {
 		if (!same_shadow)
 			qxl_io_create_primary(qdev, 0, bo);
 		bo->is_primary = true;
 	}
 
 	qxl_draw_dirty_fb(qdev, qfb, bo, 0, 0, &norect, 1, 1);
 }
 
 static void qxl_primary_atomic_disable(struct drm_plane *plane,
 				       struct drm_plane_state *old_state)
 {
 	struct qxl_device *qdev = plane->dev->dev_private;
 
 	if (old_state->fb) {
 		struct qxl_framebuffer *qfb =
 			to_qxl_framebuffer(old_state->fb);
 		struct qxl_bo *bo = gem_to_qxl_bo(qfb->obj);
 
 		if (bo->is_primary) {
 			qxl_io_destroy_primary(qdev);
 			bo->is_primary = false;
 		}
 	}
 }
 
 static int qxl_plane_atomic_check(struct drm_plane *plane,
 				  struct drm_plane_state *state)
 {
 	return 0;
 }
 
 static void qxl_cursor_atomic_update(struct drm_plane *plane,
 				     struct drm_plane_state *old_state)
 {
 	struct drm_device *dev = plane->dev;
 	struct qxl_device *qdev = dev->dev_private;
 	struct drm_framebuffer *fb = plane->state->fb;
+	struct qxl_crtc *qcrtc = to_qxl_crtc(plane->state->crtc);
 	struct qxl_release *release;
 	struct qxl_cursor_cmd *cmd;
 	struct qxl_cursor *cursor;
 	struct drm_gem_object *obj;
 	struct qxl_bo *cursor_bo = NULL, *user_bo = NULL;
 	int ret;
 	void *user_ptr;
 	int size = 64*64*4;
 
 	ret = qxl_alloc_release_reserved(qdev, sizeof(*cmd),
 					 QXL_RELEASE_CURSOR_CMD,
 					 &release, NULL);
 	if (ret)
 		return;
 
 	if (fb != old_state->fb) {
 		obj = to_qxl_framebuffer(fb)->obj;
 		user_bo = gem_to_qxl_bo(obj);
 
 		/* pinning is done in the prepare/cleanup framevbuffer */
 		ret = qxl_bo_kmap(user_bo, &user_ptr);
 		if (ret)
 			goto out_free_release;
 
 		ret = qxl_alloc_bo_reserved(qdev, release,
 					    sizeof(struct qxl_cursor) + size,
 					    &cursor_bo);
 		if (ret)
 			goto out_kunmap;
 
 		ret = qxl_release_reserve_list(release, true);
 		if (ret)
 			goto out_free_bo;
 
 		ret = qxl_bo_kmap(cursor_bo, (void **)&cursor);
 		if (ret)
 			goto out_backoff;
 
 		cursor->header.unique = 0;
 		cursor->header.type = SPICE_CURSOR_TYPE_ALPHA;
 		cursor->header.width = 64;
 		cursor->header.height = 64;
 		cursor->header.hot_spot_x = fb->hot_x;
 		cursor->header.hot_spot_y = fb->hot_y;
 		cursor->data_size = size;
 		cursor->chunk.next_chunk = 0;
 		cursor->chunk.prev_chunk = 0;
 		cursor->chunk.data_size = size;
 		memcpy(cursor->chunk.data, user_ptr, size);
 		qxl_bo_kunmap(cursor_bo);
 		qxl_bo_kunmap(user_bo);
 
 		cmd = (struct qxl_cursor_cmd *) qxl_release_map(qdev, release);
 		cmd->u.set.visible = 1;
 		cmd->u.set.shape = qxl_bo_physical_address(qdev,
 							   cursor_bo, 0);
 		cmd->type = QXL_CURSOR_SET;
+
+		qxl_bo_unref(&qcrtc->cursor_bo);
+		qcrtc->cursor_bo = cursor_bo;
+		cursor_bo = NULL;
 	} else {
 
 		ret = qxl_release_reserve_list(release, true);
 		if (ret)
 			goto out_free_release;
 
 		cmd = (struct qxl_cursor_cmd *) qxl_release_map(qdev, release);
 		cmd->type = QXL_CURSOR_MOVE;
 	}
 
 	cmd->u.position.x = plane->state->crtc_x + fb->hot_x;
 	cmd->u.position.y = plane->state->crtc_y + fb->hot_y;
 
 	qxl_release_unmap(qdev, release, &cmd->release_info);
 	qxl_push_cursor_ring_release(qdev, release, QXL_CMD_CURSOR, false);
 	qxl_release_fence_buffer_objects(release);
 
 	qxl_bo_unref (&cursor_bo);
 
 	return;
 
 out_backoff:
 	qxl_release_backoff_reserve_list(release);
 out_free_bo:
 	qxl_bo_unref(&cursor_bo);
 out_kunmap:
 	qxl_bo_kunmap(user_bo);
 out_free_release:
 	qxl_release_free(qdev, release);
 	return;
diff --git a/drivers/gpu/drm/qxl/qxl_drv.h b/drivers/gpu/drm/qxl/qxl_drv.h
index 08752c0ffb35..00a1a66b052a 100644
--- a/drivers/gpu/drm/qxl/qxl_drv.h
+++ b/drivers/gpu/drm/qxl/qxl_drv.h
@@ -84,60 +84,62 @@ struct qxl_bo {
 	struct ttm_bo_kmap_obj		kmap;
 	unsigned			pin_count;
 	void				*kptr;
 	int                             type;
 
 	/* Constant after initialization */
 	struct drm_gem_object		gem_base;
 	bool is_primary; /* is this now a primary surface */
 	bool is_dumb;
 	struct qxl_bo *shadow;
 	bool hw_surf_alloc;
 	struct qxl_surface surf;
 	uint32_t surface_id;
 	struct qxl_release *surf_create;
 };
 #define gem_to_qxl_bo(gobj) container_of((gobj), struct qxl_bo, gem_base)
 #define to_qxl_bo(tobj) container_of((tobj), struct qxl_bo, tbo)
 
 struct qxl_gem {
 	struct mutex		mutex;
 	struct list_head	objects;
 };
 
 struct qxl_bo_list {
 	struct ttm_validate_buffer tv;
 };
 
 struct qxl_crtc {
 	struct drm_crtc base;
 	int index;
+
+	struct qxl_bo *cursor_bo;
 };
 
 struct qxl_output {
 	int index;
 	struct drm_connector base;
 	struct drm_encoder enc;
 };
 
 struct qxl_framebuffer {
 	struct drm_framebuffer base;
 	struct drm_gem_object *obj;
 };
 
 #define to_qxl_crtc(x) container_of(x, struct qxl_crtc, base)
 #define drm_connector_to_qxl_output(x) container_of(x, struct qxl_output, base)
 #define drm_encoder_to_qxl_output(x) container_of(x, struct qxl_output, enc)
 #define to_qxl_framebuffer(x) container_of(x, struct qxl_framebuffer, base)
 
 struct qxl_mman {
 	struct ttm_bo_global_ref        bo_global_ref;
 	struct drm_global_reference	mem_global_ref;
 	bool				mem_global_referenced;
 	struct ttm_bo_device		bdev;
 };
 
 struct qxl_mode_info {
 	bool mode_config_initialized;
 
 	/* pointer to fbdev info structure */
 	struct qxl_fbdev *qfbdev;
-- 
2.14.3

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