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From: Thomas Zimmermann <tzimmermann@suse.de>
To: airlied@redhat.com, daniel@ffwll.ch
Cc: Thomas Zimmermann <tzimmermann@suse.de>, dri-devel@lists.freedesktop.org
Subject: [PATCH 08/12] drm/ast: Map HW cursor BOs permanently
Date: Wed, 27 Jan 2021 13:02:58 +0100	[thread overview]
Message-ID: <20210127120302.13532-9-tzimmermann@suse.de> (raw)
In-Reply-To: <20210127120302.13532-1-tzimmermann@suse.de>

The BOs of the hardware cursor are now mapped permanently while the
cursor plane is being used. This reduces the CPU overhead of the cursor
plane's atomic_update function.

The change also resolves a problem with the vmap call in the commit tail.
The vmap implementation could acquire the DMA reservation lock on the
BO, which is not allowed that late in the atomic update. Removing the
vmap call from atomic_update fixes the issue.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/ast/ast_drv.h  |  1 +
 drivers/gpu/drm/ast/ast_mode.c | 32 +++++++++++++++-----------------
 2 files changed, 16 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h
index 4117c49096d4..22193cfde255 100644
--- a/drivers/gpu/drm/ast/ast_drv.h
+++ b/drivers/gpu/drm/ast/ast_drv.h
@@ -107,6 +107,7 @@ struct ast_cursor_plane {
 
 	struct {
 		struct drm_gem_vram_object *gbo;
+		struct dma_buf_map map;
 	} hwc[AST_DEFAULT_HWC_NUM];
 
 	unsigned int next_hwc_index;
diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
index dfff30e3d411..b9b9badcee00 100644
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -759,10 +759,10 @@ ast_cursor_plane_helper_prepare_fb(struct drm_plane *plane,
 {
 	struct ast_cursor_plane *ast_cursor_plane = to_ast_cursor_plane(plane);
 	struct drm_framebuffer *fb = new_state->fb;
-	struct drm_gem_vram_object *dst_gbo =
-		ast_cursor_plane->hwc[ast_cursor_plane->next_hwc_index].gbo;
+	struct dma_buf_map dst_map =
+		ast_cursor_plane->hwc[ast_cursor_plane->next_hwc_index].map;
 	struct drm_gem_vram_object *src_gbo;
-	struct dma_buf_map src_map, dst_map;
+	struct dma_buf_map src_map;
 	void __iomem *dst;
 	void *src;
 	int ret;
@@ -777,22 +777,14 @@ ast_cursor_plane_helper_prepare_fb(struct drm_plane *plane,
 		return ret;
 	src = src_map.vaddr; /* TODO: Use mapping abstraction properly */
 
-	ret = drm_gem_vram_vmap(dst_gbo, &dst_map);
-	if (ret)
-		goto err_drm_gem_vram_vunmap;
 	dst = dst_map.vaddr_iomem; /* TODO: Use mapping abstraction properly */
 
 	/* do data transfer to cursor BO */
 	ast_update_cursor_image(dst, src, fb->width, fb->height);
 
-	drm_gem_vram_vunmap(dst_gbo, &dst_map);
 	drm_gem_vram_vunmap(src_gbo, &src_map);
 
 	return 0;
-
-err_drm_gem_vram_vunmap:
-	drm_gem_vram_vunmap(src_gbo, &src_map);
-	return ret;
 }
 
 static int ast_cursor_plane_helper_atomic_check(struct drm_plane *plane,
@@ -841,9 +833,9 @@ ast_cursor_plane_helper_atomic_update(struct drm_plane *plane,
 	u8 x_offset, y_offset;
 	u8 __iomem *dst;
 	u8 __iomem *sig;
-	int ret;
 
 	gbo = ast_cursor_plane->hwc[ast_cursor_plane->next_hwc_index].gbo;
+	map = ast_cursor_plane->hwc[ast_cursor_plane->next_hwc_index].map;
 
 	if (state->fb != old_state->fb) {
 		/* A new cursor image was installed. */
@@ -856,17 +848,12 @@ ast_cursor_plane_helper_atomic_update(struct drm_plane *plane,
 		ast_cursor_plane->next_hwc_index %= ARRAY_SIZE(ast_cursor_plane->hwc);
 	}
 
-	ret = drm_gem_vram_vmap(gbo, &map);
-	if (drm_WARN_ONCE(dev, ret, "drm_gem_vram_vmap() failed, ret=%d\n", ret))
-		return;
 	dst = map.vaddr_iomem; /* TODO: Use mapping abstraction properly */
 
 	sig = dst + AST_HWC_SIZE;
 	writel(state->crtc_x, sig + AST_HWC_SIGNATURE_X);
 	writel(state->crtc_y, sig + AST_HWC_SIGNATURE_Y);
 
-	drm_gem_vram_vunmap(gbo, &map);
-
 	offset_x = AST_MAX_HWC_WIDTH - fb->width;
 	offset_y = AST_MAX_HWC_HEIGHT - fb->height;
 
@@ -913,9 +900,12 @@ static void ast_cursor_plane_destroy(struct drm_plane *plane)
 	struct ast_cursor_plane *ast_cursor_plane = to_ast_cursor_plane(plane);
 	size_t i;
 	struct drm_gem_vram_object *gbo;
+	struct dma_buf_map map;
 
 	for (i = 0; i < ARRAY_SIZE(ast_cursor_plane->hwc); ++i) {
 		gbo = ast_cursor_plane->hwc[i].gbo;
+		map = ast_cursor_plane->hwc[i].map;
+		drm_gem_vram_vunmap(gbo, &map);
 		drm_gem_vram_unpin(gbo);
 		drm_gem_vram_put(gbo);
 	}
@@ -939,6 +929,7 @@ static int ast_cursor_plane_init(struct ast_private *ast)
 	struct drm_plane *cursor_plane = &ast_cursor_plane->base;
 	size_t size, i;
 	struct drm_gem_vram_object *gbo;
+	struct dma_buf_map map;
 	int ret;
 
 	/*
@@ -958,7 +949,11 @@ static int ast_cursor_plane_init(struct ast_private *ast)
 					    DRM_GEM_VRAM_PL_FLAG_TOPDOWN);
 		if (ret)
 			goto err_drm_gem_vram_put;
+		ret = drm_gem_vram_vmap(gbo, &map);
+		if (ret)
+			goto err_drm_gem_vram_unpin;
 		ast_cursor_plane->hwc[i].gbo = gbo;
+		ast_cursor_plane->hwc[i].map = map;
 	}
 
 	/*
@@ -983,6 +978,9 @@ static int ast_cursor_plane_init(struct ast_private *ast)
 	while (i) {
 		--i;
 		gbo = ast_cursor_plane->hwc[i].gbo;
+		map = ast_cursor_plane->hwc[i].map;
+		drm_gem_vram_vunmap(gbo, &map);
+err_drm_gem_vram_unpin:
 		drm_gem_vram_unpin(gbo);
 err_drm_gem_vram_put:
 		drm_gem_vram_put(gbo);
-- 
2.30.0

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  parent reply	other threads:[~2021-01-27 12:03 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-27 12:02 [PATCH 00/12] drm/ast: Move cursor vmap calls out of commit tail Thomas Zimmermann
2021-01-27 12:02 ` [PATCH 01/12] drm/ast: Add constants for VGACRCB register bits Thomas Zimmermann
2021-01-27 12:02 ` [PATCH 02/12] drm/ast: Fix invalid usage of AST_MAX_HWC_WIDTH in cursor atomic_check Thomas Zimmermann
2021-01-27 12:02 ` [PATCH 03/12] drm/ast: Initialize planes in helper functions Thomas Zimmermann
2021-01-27 12:02 ` [PATCH 04/12] drm/ast: Allocate HW cursor BOs during cursor-plane initialization Thomas Zimmermann
2021-01-27 12:02 ` [PATCH 05/12] drm/ast: Inline ast cursor-update functions into modesetting code Thomas Zimmermann
2021-01-27 12:02 ` [PATCH 06/12] drm/ast: Add cursor-plane data structure Thomas Zimmermann
2021-01-27 12:02 ` [PATCH 07/12] drm/ast: Store cursor BOs in cursor plane Thomas Zimmermann
2021-01-27 12:02 ` Thomas Zimmermann [this message]
2021-01-27 12:02 ` [PATCH 09/12] drm/ast: Introduce dedicated cursor-plane state Thomas Zimmermann
2021-01-27 12:03 ` [PATCH 10/12] drm/ast: Fix cursor BO pinning and mapping Thomas Zimmermann
2021-01-27 13:40   ` Thomas Zimmermann
2021-01-27 12:03 ` [PATCH 11/12] drm/ast: Move all of the cursor-update functionality to atomic_update Thomas Zimmermann
2021-01-27 12:03 ` [PATCH 12/12] drm/ast: Store each HW cursor offset after pinning the rsp BO Thomas Zimmermann

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