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Date: Wed, 10 Apr 2019 11:44:41 +0200
From: Noralf Trønnes <noralf@...nnes.org>
To: Gerd Hoffmann <kraxel@...hat.com>, dri-devel@...ts.freedesktop.org
Cc: David Airlie <airlied@...ux.ie>,
open list <linux-kernel@...r.kernel.org>,
"open list:DRM DRIVER FOR QEMU'S CIRRUS DEVICE"
<virtualization@...ts.linux-foundation.org>,
Maxime Ripard <maxime.ripard@...tlin.com>,
Dave Airlie <airlied@...hat.com>, Sean Paul <sean@...rly.run>
Subject: Re: [PATCH v2 2/3] drm: switch drm_fb_xrgb8888_to_rgb565_dstclip to
accept __iomem dst
Den 10.04.2019 08.38, skrev Gerd Hoffmann:
> Not all archs have the __io_virt() macro, so cirrus can't simply convert
> pointers that way. The drm format helpers have to use memcpy_toio()
> instead.
>
> This patch makes drm_fb_xrgb8888_to_rgb565_dstclip() accept a __iomem
> dst pointer and use memcpy_toio() instead of memcpy(). The helper
> function (drm_fb_xrgb8888_to_rgb565_line) has been changed to process
> a single scanline.
>
> Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
> ---
> include/drm/drm_format_helper.h | 2 +-
> drivers/gpu/drm/cirrus/cirrus.c | 2 +-
> drivers/gpu/drm/drm_format_helper.c | 113 ++++++++++++++--------------
> 3 files changed, 60 insertions(+), 57 deletions(-)
>
> diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
> index bc2e1004e166..d1b8a9ea01b4 100644
> --- a/include/drm/drm_format_helper.h
> +++ b/include/drm/drm_format_helper.h
> @@ -23,7 +23,7 @@ void drm_fb_swab16(u16 *dst, void *vaddr, struct drm_framebuffer *fb,
> void drm_fb_xrgb8888_to_rgb565(void *dst, void *vaddr,
> struct drm_framebuffer *fb,
> struct drm_rect *clip, bool swap);
> -void drm_fb_xrgb8888_to_rgb565_dstclip(void *dst, unsigned int dst_pitch,
> +void drm_fb_xrgb8888_to_rgb565_dstclip(void __iomem *dst, unsigned int dst_pitch,
> void *vaddr, struct drm_framebuffer *fb,
> struct drm_rect *clip, bool swap);
> void drm_fb_xrgb8888_to_rgb888_dstclip(void *dst, unsigned int dst_pitch,
> diff --git a/drivers/gpu/drm/cirrus/cirrus.c b/drivers/gpu/drm/cirrus/cirrus.c
> index 0fc3aa31b5a4..ed2f2d8cfb6f 100644
> --- a/drivers/gpu/drm/cirrus/cirrus.c
> +++ b/drivers/gpu/drm/cirrus/cirrus.c
> @@ -311,7 +311,7 @@ static int cirrus_fb_blit_rect(struct drm_framebuffer *fb,
> vmap, fb, rect);
>
> else if (fb->format->cpp[0] == 4 && cirrus->cpp == 2)
> - drm_fb_xrgb8888_to_rgb565_dstclip(__io_virt(cirrus->vram),
> + drm_fb_xrgb8888_to_rgb565_dstclip(cirrus->vram,
> cirrus->pitch,
> vmap, fb, rect, false);
>
> diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c
> index dace05638bc3..c9521af4e90b 100644
> --- a/drivers/gpu/drm/drm_format_helper.c
> +++ b/drivers/gpu/drm/drm_format_helper.c
> @@ -113,42 +113,22 @@ void drm_fb_swab16(u16 *dst, void *vaddr, struct drm_framebuffer *fb,
> }
> EXPORT_SYMBOL(drm_fb_swab16);
>
> -static void drm_fb_xrgb8888_to_rgb565_lines(void *dst, unsigned int dst_pitch,
> - void *src, unsigned int src_pitch,
> - unsigned int src_linelength,
> - unsigned int lines,
> - bool swap)
> +static void drm_fb_xrgb8888_to_rgb565_line(u16 *dbuf, u32 *sbuf,
> + unsigned int pixels,
> + bool swab)
Both here and further down you change the argument name: swap -> swab.
If you want that, you need to fix the function declaration and the docs
as well.
With that sorted out:
Reviewed-by: Noralf Trønnes <noralf@...nnes.org>
> {
> - unsigned int linepixels = src_linelength / sizeof(u32);
> - unsigned int x, y;
> - u32 *sbuf;
> - u16 *dbuf, val16;
> + unsigned int x;
> + u16 val16;
>
> - /*
> - * The cma memory is write-combined so reads are uncached.
> - * Speed up by fetching one line at a time.
> - */
> - sbuf = kmalloc(src_linelength, GFP_KERNEL);
> - if (!sbuf)
> - return;
> -
> - for (y = 0; y < lines; y++) {
> - memcpy(sbuf, src, src_linelength);
> - dbuf = dst;
> - for (x = 0; x < linepixels; x++) {
> - val16 = ((sbuf[x] & 0x00F80000) >> 8) |
> - ((sbuf[x] & 0x0000FC00) >> 5) |
> - ((sbuf[x] & 0x000000F8) >> 3);
> - if (swap)
> - *dbuf++ = swab16(val16);
> - else
> - *dbuf++ = val16;
> - }
> - src += src_pitch;
> - dst += dst_pitch;
> + for (x = 0; x < pixels; x++) {
> + val16 = ((sbuf[x] & 0x00F80000) >> 8) |
> + ((sbuf[x] & 0x0000FC00) >> 5) |
> + ((sbuf[x] & 0x000000F8) >> 3);
> + if (swab)
> + dbuf[x] = swab16(val16);
> + else
> + dbuf[x] = val16;
> }
> -
> - kfree(sbuf);
> }
>
> /**
> @@ -167,23 +147,37 @@ static void drm_fb_xrgb8888_to_rgb565_lines(void *dst, unsigned int dst_pitch,
> */
> void drm_fb_xrgb8888_to_rgb565(void *dst, void *vaddr,
> struct drm_framebuffer *fb,
> - struct drm_rect *clip, bool swap)
> + struct drm_rect *clip, bool swab)
> {
> - unsigned int src_offset = (clip->y1 * fb->pitches[0])
> - + (clip->x1 * sizeof(u32));
> - size_t src_len = (clip->x2 - clip->x1) * sizeof(u32);
> - size_t dst_len = (clip->x2 - clip->x1) * sizeof(u16);
> + size_t linepixels = clip->x2 - clip->x1;
> + size_t src_len = linepixels * sizeof(u32);
> + size_t dst_len = linepixels * sizeof(u16);
> + unsigned y, lines = clip->y2 - clip->y1;
> + void *sbuf;
>
> - drm_fb_xrgb8888_to_rgb565_lines(dst, dst_len,
> - vaddr + src_offset, fb->pitches[0],
> - src_len, clip->y2 - clip->y1,
> - swap);
> + /*
> + * The cma memory is write-combined so reads are uncached.
> + * Speed up by fetching one line at a time.
> + */
> + sbuf = kmalloc(src_len, GFP_KERNEL);
> + if (!sbuf)
> + return;
> +
> + vaddr += clip_offset(clip, fb->pitches[0], sizeof(u32));
> + for (y = 0; y < lines; y++) {
> + memcpy(sbuf, vaddr, src_len);
> + drm_fb_xrgb8888_to_rgb565_line(dst, sbuf, linepixels, swab);
> + vaddr += fb->pitches[0];
> + dst += dst_len;
> + }
> +
> + kfree(sbuf);
> }
> EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565);
>
> /**
> * drm_fb_xrgb8888_to_rgb565_dstclip - Convert XRGB8888 to RGB565 clip buffer
> - * @dst: RGB565 destination buffer
> + * @dst: RGB565 destination buffer (iomem)
> * @dst_pitch: destination buffer pitch
> * @vaddr: XRGB8888 source buffer
> * @fb: DRM framebuffer
> @@ -194,22 +188,31 @@ EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565);
> * support XRGB8888.
> *
> * This function applies clipping on dst, i.e. the destination is a
> - * full framebuffer but only the clip rect content is copied over.
> + * full (iomem) framebuffer but only the clip rect content is copied over.
> */
> -void drm_fb_xrgb8888_to_rgb565_dstclip(void *dst, unsigned int dst_pitch,
> +void drm_fb_xrgb8888_to_rgb565_dstclip(void __iomem *dst, unsigned int dst_pitch,
> void *vaddr, struct drm_framebuffer *fb,
> - struct drm_rect *clip, bool swap)
> + struct drm_rect *clip, bool swab)
> {
> - unsigned int src_offset = (clip->y1 * fb->pitches[0])
> - + (clip->x1 * sizeof(u32));
> - unsigned int dst_offset = (clip->y1 * dst_pitch)
> - + (clip->x1 * sizeof(u16));
> - size_t src_len = (clip->x2 - clip->x1) * sizeof(u32);
> + size_t linepixels = clip->x2 - clip->x1;
> + size_t dst_len = linepixels * sizeof(u16);
> + unsigned y, lines = clip->y2 - clip->y1;
> + void *dbuf;
>
> - drm_fb_xrgb8888_to_rgb565_lines(dst + dst_offset, dst_pitch,
> - vaddr + src_offset, fb->pitches[0],
> - src_len, clip->y2 - clip->y1,
> - swap);
> + dbuf = kmalloc(dst_len, GFP_KERNEL);
> + if (!dbuf)
> + return;
> +
> + vaddr += clip_offset(clip, fb->pitches[0], sizeof(u32));
> + dst += clip_offset(clip, dst_pitch, sizeof(u16));
> + for (y = 0; y < lines; y++) {
> + drm_fb_xrgb8888_to_rgb565_line(dbuf, vaddr, linepixels, swab);
> + memcpy_toio(dst, dbuf, dst_len);
> + vaddr += fb->pitches[0];
> + dst += dst_len;
> + }
> +
> + kfree(dbuf);
> }
> EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565_dstclip);
>
>
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