[PATCH 2/2] drm/vkms: Compute CRC with Cursor Plane
Daniel Vetter
daniel at ffwll.ch
Tue Aug 7 16:33:36 UTC 2018
On Mon, Aug 06, 2018 at 06:58:29AM +0300, Haneen Mohammed wrote:
> This patch compute CRC for output frame with cursor and primary plane.
> Blend cursor with primary plane and compute CRC on the resulted frame.
>
> Signed-off-by: Haneen Mohammed <hamohammed.sa at gmail.com>
Nice!
I assume with this you're passing all the crc based cursor tests in igt?
If so, please mention this in the commit message, so that there's a record
of the testing done on this.
One fairly huge gap we iirc have in our cursor testing is that there's not
much (if any?) alpha blending coverage. We kinda need that to make sure
this all works correctly. The usual trick is to only check the extreme
alpha values, i.e. fully opaque and fully transparent, since intermediate
values are affected by hw-specific rounding modes.
> ---
> drivers/gpu/drm/vkms/vkms_crc.c | 149 +++++++++++++++++++++++++-----
> drivers/gpu/drm/vkms/vkms_drv.h | 5 +-
> drivers/gpu/drm/vkms/vkms_plane.c | 10 +-
> 3 files changed, 137 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/gpu/drm/vkms/vkms_crc.c b/drivers/gpu/drm/vkms/vkms_crc.c
> index 37d717f38e3c..4853a739ae5a 100644
> --- a/drivers/gpu/drm/vkms/vkms_crc.c
> +++ b/drivers/gpu/drm/vkms/vkms_crc.c
> @@ -1,36 +1,137 @@
> // SPDX-License-Identifier: GPL-2.0
> #include "vkms_drv.h"
> #include <linux/crc32.h>
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> #include <drm/drm_gem_framebuffer_helper.h>
>
> -static uint32_t _vkms_get_crc(struct vkms_crc_data *crc_data)
> +/**
> + * compute_crc - Compute CRC value on output frame
> + *
> + * @vaddr_out: address to final framebuffer
> + * @crc_out: framebuffer's metadata
> + *
> + * returns CRC value computed using crc32 on the visible portion of
> + * the final framebuffer at vaddr_out
> + */
> +static uint32_t compute_crc(void *vaddr_out, struct vkms_crc_data *crc_out)
> {
> - struct drm_framebuffer *fb = &crc_data->fb;
> + int i, src_offset;
> + int x_src = crc_out->src.x1 >> 16;
> + int y_src = crc_out->src.y1 >> 16;
> + int h_src = drm_rect_height(&crc_out->src) >> 16;
> + int w_src = drm_rect_width(&crc_out->src) >> 16;
> + int size_byte = w_src * crc_out->cpp;
> + u32 crc = 0;
> +
> + for (i = y_src; i < y_src + h_src; i++) {
> + src_offset = crc_out->offset
> + + (i * crc_out->pitch)
> + + (x_src * crc_out->cpp);
> + crc = crc32_le(crc, vaddr_out + src_offset, size_byte);
> + }
> +
> + return crc;
> +}
> +
> +/**
> + * blend - belnd value at vaddr_src with value at vaddr_dst
> + * @vaddr_dst: destination address
> + * @vaddr_src: source address
> + * @crc_dst: destination framebuffer's metadata
> + * @crc_src: source framebuffer's metadata
> + *
> + * Blend value at vaddr_src with value at vaddr_dst.
> + * Currently, this function write value at vaddr_src on value
> + * at vaddr_dst using buffer's metadata to locate the new values
> + * from vaddr_src and their distenation at vaddr_dst.
> + *
> + * Todo: Use the alpha value to blend vaddr_src with vaddr_dst
> + * instead of overwriting it.
Another todo: We must clear the alpha channel in the result after
blending. This also applies to the primary plane, where the XRGB for the
pixel format mandates that we entirely ignore the alpha channel.
This is also something we should probably have an igt testcase for.
Since there's a few open ends: How many weeks are left in your outreachy
internship? We need to make sure that at least all the issues are covered
in a vkms todo file. Would be great to add that in
Documentation/gpu/vkms.rst, like we have for other drivers.
-Daniel
> + */
> +static void blend(void *vaddr_dst, void *vaddr_src,
> + struct vkms_crc_data *crc_dst,
> + struct vkms_crc_data *crc_src)
> +{
> + int i, j, j_dst, i_dst;
> + int offset_src, offset_dst;
> +
> + int x_src = crc_src->src.x1 >> 16;
> + int y_src = crc_src->src.y1 >> 16;
> +
> + int x_dst = crc_src->dst.x1;
> + int y_dst = crc_src->dst.y1;
> + int h_dst = drm_rect_height(&crc_src->dst);
> + int w_dst = drm_rect_width(&crc_src->dst);
> +
> + int y_limit = y_src + h_dst;
> + int x_limit = x_src + w_dst;
> +
> + for (i = y_src, i_dst = y_dst; i < y_limit; ++i) {
> + for (j = x_src, j_dst = x_dst; j < x_limit; ++j) {
> + offset_dst = crc_dst->offset
> + + (i_dst * crc_dst->pitch)
> + + (j_dst++ * crc_dst->cpp);
> + offset_src = crc_src->offset
> + + (i * crc_src->pitch)
> + + (j * crc_src->cpp);
> +
> + memcpy(vaddr_dst + offset_dst,
> + vaddr_src + offset_src, sizeof(u32));
> + }
> + i_dst++;
> + }
> +}
> +
> +static void compose_cursor(struct vkms_crc_data *cursor_crc,
> + struct vkms_crc_data *primary_crc, void *vaddr_out)
> +{
> + struct drm_gem_object *cursor_obj;
> + struct vkms_gem_object *cursor_vkms_obj;
> +
> + cursor_obj = drm_gem_fb_get_obj(&cursor_crc->fb, 0);
> + cursor_vkms_obj = drm_gem_to_vkms_gem(cursor_obj);
> +
> + mutex_lock(&cursor_vkms_obj->pages_lock);
> + if (WARN_ON(!cursor_vkms_obj->vaddr))
> + goto out;
> +
> + blend(vaddr_out, cursor_vkms_obj->vaddr, primary_crc, cursor_crc);
> +
> +out:
> + mutex_unlock(&cursor_vkms_obj->pages_lock);
> +}
> +
> +static uint32_t _vkms_get_crc(struct vkms_crc_data *primary_crc,
> + struct vkms_crc_data *cursor_crc)
> +{
> + struct drm_framebuffer *fb = &primary_crc->fb;
> struct drm_gem_object *gem_obj = drm_gem_fb_get_obj(fb, 0);
> struct vkms_gem_object *vkms_obj = drm_gem_to_vkms_gem(gem_obj);
> + void *vaddr_out = kzalloc(vkms_obj->gem.size, GFP_KERNEL);
> u32 crc = 0;
> - int i = 0;
> - unsigned int x = crc_data->src.x1 >> 16;
> - unsigned int y = crc_data->src.y1 >> 16;
> - unsigned int height = drm_rect_height(&crc_data->src) >> 16;
> - unsigned int width = drm_rect_width(&crc_data->src) >> 16;
> - unsigned int cpp = fb->format->cpp[0];
> - unsigned int src_offset;
> - unsigned int size_byte = width * cpp;
> - void *vaddr;
>
> - mutex_lock(&vkms_obj->pages_lock);
> - vaddr = vkms_obj->vaddr;
> - if (WARN_ON(!vaddr))
> - goto out;
> + if (!vaddr_out) {
> + DRM_ERROR("Failed to allocate memory for output frame.");
> + return 0;
> + }
>
> - for (i = y; i < y + height; i++) {
> - src_offset = fb->offsets[0] + (i * fb->pitches[0]) + (x * cpp);
> - crc = crc32_le(crc, vaddr + src_offset, size_byte);
> + mutex_lock(&vkms_obj->pages_lock);
> + if (WARN_ON(!vkms_obj->vaddr)) {
> + mutex_lock(&vkms_obj->pages_lock);
> + return crc;
> }
>
> -out:
> + memcpy(vaddr_out, vkms_obj->vaddr, vkms_obj->gem.size);
> mutex_unlock(&vkms_obj->pages_lock);
> +
> + if (cursor_crc)
> + compose_cursor(cursor_crc, primary_crc, vaddr_out);
> +
> + crc = compute_crc(vaddr_out, primary_crc);
> +
> + kfree(vaddr_out);
> +
> return crc;
> }
>
> @@ -44,8 +145,8 @@ void vkms_crc_work_handle(struct work_struct *work)
> struct vkms_device *vdev = container_of(out, struct vkms_device,
> output);
> struct vkms_crc_data *primary_crc = NULL;
> + struct vkms_crc_data *cursor_crc = NULL;
> struct drm_plane *plane;
> -
> u32 crc32 = 0;
>
> drm_for_each_plane(plane, &vdev->drm) {
> @@ -58,14 +159,14 @@ void vkms_crc_work_handle(struct work_struct *work)
> if (drm_framebuffer_read_refcount(&crc_data->fb) == 0)
> continue;
>
> - if (plane->type == DRM_PLANE_TYPE_PRIMARY) {
> + if (plane->type == DRM_PLANE_TYPE_PRIMARY)
> primary_crc = crc_data;
> - break;
> - }
> + else
> + cursor_crc = crc_data;
> }
>
> if (primary_crc)
> - crc32 = _vkms_get_crc(primary_crc);
> + crc32 = _vkms_get_crc(primary_crc, cursor_crc);
>
> drm_crtc_add_crc_entry(crtc, true, crtc_state->n_frame, &crc32);
> }
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
> index 36e524f791fe..173875dc361e 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.h
> +++ b/drivers/gpu/drm/vkms/vkms_drv.h
> @@ -25,8 +25,11 @@ static const u32 vkms_cursor_formats[] = {
> };
>
> struct vkms_crc_data {
> - struct drm_rect src;
> struct drm_framebuffer fb;
> + struct drm_rect src, dst;
> + unsigned int offset;
> + unsigned int pitch;
> + unsigned int cpp;
> };
>
> /**
> diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
> index 428247d403dc..7041007396ae 100644
> --- a/drivers/gpu/drm/vkms/vkms_plane.c
> +++ b/drivers/gpu/drm/vkms/vkms_plane.c
> @@ -85,16 +85,22 @@ static void vkms_plane_atomic_update(struct drm_plane *plane,
> struct drm_plane_state *old_state)
> {
> struct vkms_plane_state *vkms_plane_state;
> + struct drm_framebuffer *fb = plane->state->fb;
> struct vkms_crc_data *crc_data;
>
> - if (!plane->state->crtc || !plane->state->fb)
> + if (!plane->state->crtc || !fb)
> return;
>
> vkms_plane_state = to_vkms_plane_state(plane->state);
> +
> crc_data = vkms_plane_state->crc_data;
> memcpy(&crc_data->src, &plane->state->src, sizeof(struct drm_rect));
> - memcpy(&crc_data->fb, plane->state->fb, sizeof(struct drm_framebuffer));
> + memcpy(&crc_data->dst, &plane->state->dst, sizeof(struct drm_rect));
> + memcpy(&crc_data->fb, fb, sizeof(struct drm_framebuffer));
> drm_framebuffer_get(&crc_data->fb);
> + crc_data->offset = fb->offsets[0];
> + crc_data->pitch = fb->pitches[0];
> + crc_data->cpp = fb->format->cpp[0];
> }
>
> static int vkms_plane_atomic_check(struct drm_plane *plane,
> --
> 2.17.1
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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