Hi Thomas,
On Wed, Jul 27, 2022 at 01:33:01PM +0200, Thomas Zimmermann wrote:
> 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@xxxxxxx>
> ---
> 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
The rename confused me since this function continue to operate only on
io memory, but I see that this is all fixed up in later patches.
It would be nice to have this mentioned in the changelog, just in case
someone else takes a deeper look at it.
With the changelog updated:
Reviewed-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
See also comments below.
> * @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;
Maybe
struct iosys_map dst = IOSYS_MAP_INIT_VADDR(sdev->screen_base);
> 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;
Likewise:
struct iosys_map dst = IOSYS_MAP_INIT_VADDR(sdev->screen_base);
> 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
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