[PATCH 01/12] drm/format-helper: Provide drm_fb_blit()

Thomas Zimmermann
Wed, 27 Jul 2022 11:33:01 -0000

Provide drm_fb_blit() that works with struct iosys_map. Update all
users of drm_fb_blit_toio(), which required a destination buffer in
I/O memory. The new function's interface works with multi-plane
color formats, although the implementation only supports a single
plane for now.

Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
 drivers/gpu/drm/drm_format_helper.c | 39 ++++++++++++++++++-----------
 drivers/gpu/drm/tiny/simpledrm.c    | 18 +++++++------
 include/drm/drm_format_helper.h     |  7 +++---
 3 files changed, 38 insertions(+), 26 deletions(-)

diff --git a/drivers/gpu/drm/drm_format_helper.c
b/drivers/gpu/drm/drm_format_helper.c
index c6182b5de78b..4d74d46ab155 100644
--- a/drivers/gpu/drm/drm_format_helper.c
+++ b/drivers/gpu/drm/drm_format_helper.c
@@ -8,9 +8,10 @@
  * (at your option) any later version.
  */

+#include <linux/io.h>
+#include <linux/iosys-map.h>
 #include <linux/module.h>
 #include <linux/slab.h>
-#include <linux/io.h>

 #include <drm/drm_device.h>
 #include <drm/drm_format_helper.h>
@@ -545,9 +546,9 @@ void drm_fb_xrgb8888_to_gray8(void *dst, unsigned int
dst_pitch, const void *vad
 EXPORT_SYMBOL(drm_fb_xrgb8888_to_gray8);

 /**
- * drm_fb_blit_toio - Copy parts of a framebuffer to display memory
- * @dst:	The display memory to copy to
- * @dst_pitch:	Number of bytes between two consecutive scanlines within dst
+ * drm_fb_blit - Copy parts of a framebuffer to display memory
+ * @dst:	Array of display-memory addresses to copy to
+ * @dst_pitch:	Array of numbers of bytes between two consecutive scanlines
within dst
  * @dst_format:	FOURCC code of the display's color format
  * @vmap:	The framebuffer memory to copy from
  * @fb:		The framebuffer to copy from
@@ -557,14 +558,18 @@ EXPORT_SYMBOL(drm_fb_xrgb8888_to_gray8);
  * formats of the display and the framebuffer mismatch, the blit function
  * will attempt to convert between them.
  *
+ * The parameters @dst, @dst_pitch and @vmap refer to arrays. Each array must
+ * have at least as many entries as there are planes in @dst_format's
format. Each
+ * entry stores the value for the format's respective color plane at the
same index.
+ *
  * Returns:
  * 0 on success, or
  * -EINVAL if the color-format conversion failed, or
  * a negative error code otherwise.
  */
-int drm_fb_blit_toio(void __iomem *dst, unsigned int dst_pitch, uint32_t
dst_format,
-		     const void *vmap, const struct drm_framebuffer *fb,
-		     const struct drm_rect *clip)
+int drm_fb_blit(struct iosys_map *dst, const unsigned int *dst_pitch, uint32_t
dst_format,
+		const struct iosys_map *vmap, const struct drm_framebuffer *fb,
+		const struct drm_rect *clip)
 {
 	uint32_t fb_format = fb->format->format;

@@ -579,30 +584,35 @@ int drm_fb_blit_toio(void __iomem *dst, unsigned int
dst_pitch, uint32_t dst_for
 		dst_format = DRM_FORMAT_XRGB2101010;

 	if (dst_format == fb_format) {
-		drm_fb_memcpy_toio(dst, dst_pitch, vmap, fb, clip);
+		drm_fb_memcpy_toio(dst[0].vaddr_iomem, dst_pitch[0], vmap[0].vaddr, fb,
clip);
 		return 0;

 	} else if (dst_format == DRM_FORMAT_RGB565) {
 		if (fb_format == DRM_FORMAT_XRGB8888) {
-			drm_fb_xrgb8888_to_rgb565_toio(dst, dst_pitch, vmap, fb, clip, false);
+			drm_fb_xrgb8888_to_rgb565_toio(dst[0].vaddr_iomem, dst_pitch[0],
+						       vmap[0].vaddr, fb, clip, false);
 			return 0;
 		}
 	} else if (dst_format == DRM_FORMAT_RGB888) {
 		if (fb_format == DRM_FORMAT_XRGB8888) {
-			drm_fb_xrgb8888_to_rgb888_toio(dst, dst_pitch, vmap, fb, clip);
+			drm_fb_xrgb8888_to_rgb888_toio(dst[0].vaddr_iomem, dst_pitch[0],
+						       vmap[0].vaddr, fb, clip);
 			return 0;
 		}
 	} else if (dst_format == DRM_FORMAT_XRGB8888) {
 		if (fb_format == DRM_FORMAT_RGB888) {
-			drm_fb_rgb888_to_xrgb8888_toio(dst, dst_pitch, vmap, fb, clip);
+			drm_fb_rgb888_to_xrgb8888_toio(dst[0].vaddr_iomem, dst_pitch[0],
+						       vmap[0].vaddr, fb, clip);
 			return 0;
 		} else if (fb_format == DRM_FORMAT_RGB565) {
-			drm_fb_rgb565_to_xrgb8888_toio(dst, dst_pitch, vmap, fb, clip);
+			drm_fb_rgb565_to_xrgb8888_toio(dst[0].vaddr_iomem, dst_pitch[0],
+						       vmap[0].vaddr, fb, clip);
 			return 0;
 		}
 	} else if (dst_format == DRM_FORMAT_XRGB2101010) {
 		if (fb_format == DRM_FORMAT_XRGB8888) {
-			drm_fb_xrgb8888_to_xrgb2101010_toio(dst, dst_pitch, vmap, fb, clip);
+			drm_fb_xrgb8888_to_xrgb2101010_toio(dst[0].vaddr_iomem, dst_pitch[0],
+							    vmap[0].vaddr, fb, clip);
 			return 0;
 		}
 	}
@@ -612,8 +622,7 @@ int drm_fb_blit_toio(void __iomem *dst, unsigned int
dst_pitch, uint32_t dst_for

 	return -EINVAL;
 }
-EXPORT_SYMBOL(drm_fb_blit_toio);
-
+EXPORT_SYMBOL(drm_fb_blit);

 static void drm_fb_gray8_to_mono_line(void *dbuf, const void *sbuf, unsigned
int pixels)
 {
diff --git a/drivers/gpu/drm/tiny/simpledrm.c b/drivers/gpu/drm/tiny/simpledrm.c
index 5422363690e7..1ec73bec0513 100644
--- a/drivers/gpu/drm/tiny/simpledrm.c
+++ b/drivers/gpu/drm/tiny/simpledrm.c
@@ -652,9 +652,8 @@ simpledrm_simple_display_pipe_enable(struct
drm_simple_display_pipe *pipe,
 	struct simpledrm_device *sdev = simpledrm_device_of_dev(pipe->crtc.dev);
 	struct drm_shadow_plane_state *shadow_plane_state =
to_drm_shadow_plane_state(plane_state);
 	struct drm_framebuffer *fb = plane_state->fb;
-	void *vmap = shadow_plane_state->data[0].vaddr; /* TODO: Use mapping
abstraction */
 	struct drm_device *dev = &sdev->dev;
-	void __iomem *dst = sdev->screen_base;
+	struct iosys_map dst;
 	struct drm_rect src_clip, dst_clip;
 	int idx;

@@ -670,8 +669,10 @@ simpledrm_simple_display_pipe_enable(struct
drm_simple_display_pipe *pipe,
 	if (!drm_dev_enter(dev, &idx))
 		return;

-	dst += drm_fb_clip_offset(sdev->pitch, sdev->format, &dst_clip);
-	drm_fb_blit_toio(dst, sdev->pitch, sdev->format->format, vmap, fb,
&src_clip);
+	iosys_map_set_vaddr_iomem(&dst, sdev->screen_base);
+	iosys_map_incr(&dst, drm_fb_clip_offset(sdev->pitch, sdev->format,
&dst_clip));
+	drm_fb_blit(&dst, &sdev->pitch, sdev->format->format,
+		    shadow_plane_state->data, fb, &src_clip);

 	drm_dev_exit(idx);
 }
@@ -699,10 +700,9 @@ simpledrm_simple_display_pipe_update(struct
drm_simple_display_pipe *pipe,
 	struct simpledrm_device *sdev = simpledrm_device_of_dev(pipe->crtc.dev);
 	struct drm_plane_state *plane_state = pipe->plane.state;
 	struct drm_shadow_plane_state *shadow_plane_state =
to_drm_shadow_plane_state(plane_state);
-	void *vmap = shadow_plane_state->data[0].vaddr; /* TODO: Use mapping
abstraction */
 	struct drm_framebuffer *fb = plane_state->fb;
 	struct drm_device *dev = &sdev->dev;
-	void __iomem *dst = sdev->screen_base;
+	struct iosys_map dst;
 	struct drm_rect src_clip, dst_clip;
 	int idx;

@@ -719,8 +719,10 @@ simpledrm_simple_display_pipe_update(struct
drm_simple_display_pipe *pipe,
 	if (!drm_dev_enter(dev, &idx))
 		return;

-	dst += drm_fb_clip_offset(sdev->pitch, sdev->format, &dst_clip);
-	drm_fb_blit_toio(dst, sdev->pitch, sdev->format->format, vmap, fb,
&src_clip);
+	iosys_map_set_vaddr_iomem(&dst, sdev->screen_base);
+	iosys_map_incr(&dst, drm_fb_clip_offset(sdev->pitch, sdev->format,
&dst_clip));
+	drm_fb_blit(&dst, &sdev->pitch, sdev->format->format,
+		    shadow_plane_state->data, fb, &src_clip);

 	drm_dev_exit(idx);
 }
diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
index 55145eca0782..21daea7fda99 100644
--- a/include/drm/drm_format_helper.h
+++ b/include/drm/drm_format_helper.h
@@ -6,6 +6,7 @@
 #ifndef __LINUX_DRM_FORMAT_HELPER_H
 #define __LINUX_DRM_FORMAT_HELPER_H

+struct iosys_map;
 struct drm_format_info;
 struct drm_framebuffer;
 struct drm_rect;
@@ -39,9 +40,9 @@ void drm_fb_xrgb8888_to_xrgb2101010_toio(void __iomem *dst,
unsigned int dst_pit
 void drm_fb_xrgb8888_to_gray8(void *dst, unsigned int dst_pitch, const void
*vaddr,
 			      const struct drm_framebuffer *fb, const struct drm_rect *clip);

-int drm_fb_blit_toio(void __iomem *dst, unsigned int dst_pitch, uint32_t
dst_format,
-		     const void *vmap, const struct drm_framebuffer *fb,
-		     const struct drm_rect *rect);
+int drm_fb_blit(struct iosys_map *dst, const unsigned int *dst_pitch, uint32_t
dst_format,
+		const struct iosys_map *vmap, const struct drm_framebuffer *fb,
+		const struct drm_rect *rect);

 void drm_fb_xrgb8888_to_mono(void *dst, unsigned int dst_pitch, const void
*src,
 			     const struct drm_framebuffer *fb, const struct drm_rect *clip);
--
2.37.1