[RESEND v6 7/9] drm: vkms: Supports to the case where primary plane doesn't match the CRTC
Igor Torrente
igormtorrente at gmail.com
Fri Aug 19 18:24:09 UTC 2022
We will remove the current assumption that the primary plane has the
same size and position as CRTC and that the primary plane is the
bottom-most in zpos order, or is even enabled. At least as far
as the blending machinery is concerned.
For that we will add CRTC dimension information to `vkms_crtc_state`
and add a opaque black backgound color.
Because now we need to fill the background, we had a loss in
performance with this change. Results running the IGT[1] test
`igt at kms_cursor_crc@pipe-a-cursor-512x512-onscreen` ten times:
| Frametime |
|:--------------------------------------------:|
| Implementation | Previous | This commit |
|:---------------:|:---------:|:--------------:|
| frametime range | 5~18 ms | 10~22 ms |
| Average | 8.47 ms | 12.32 ms |
[1] IGT commit id: bc3f6833a12221a46659535dac06ebb312490eb4
V6: Improve the commit description (Pekka Paalanen).
Update some comments (Pekka Paalanen).
Remove some fields from `vkms_crtc_state` and move where
some variables are set (Pekka Paalanen).
Signed-off-by: Igor Torrente <igormtorrente at gmail.com>
---
Documentation/gpu/vkms.rst | 3 +-
drivers/gpu/drm/vkms/vkms_composer.c | 59 +++++++++++++--------------
drivers/gpu/drm/vkms/vkms_writeback.c | 4 ++
3 files changed, 33 insertions(+), 33 deletions(-)
diff --git a/Documentation/gpu/vkms.rst b/Documentation/gpu/vkms.rst
index a49e4ae92653..49db221c0f52 100644
--- a/Documentation/gpu/vkms.rst
+++ b/Documentation/gpu/vkms.rst
@@ -121,8 +121,7 @@ There's lots of plane features we could add support for:
- ARGB format on primary plane: blend the primary plane into background with
translucent alpha.
-- Support when the primary plane isn't exactly matching the output size: blend
- the primary plane into the black background.
+- Add background color KMS property[Good to get started].
- Full alpha blending on all planes.
diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vkms_composer.c
index 5b1a8bdd8268..8e53fa80742b 100644
--- a/drivers/gpu/drm/vkms/vkms_composer.c
+++ b/drivers/gpu/drm/vkms/vkms_composer.c
@@ -61,6 +61,13 @@ static bool check_y_limit(struct vkms_frame_info *frame_info, int y)
return false;
}
+static void fill_background(const struct pixel_argb_u16 *background_color,
+ struct line_buffer *output_buffer)
+{
+ for (size_t i = 0; i < output_buffer->n_pixels; i++)
+ output_buffer->pixels[i] = *background_color;
+}
+
/**
* @wb_frame_info: The writeback frame buffer metadata
* @crtc_state: The crtc state
@@ -78,21 +85,17 @@ static void blend(struct vkms_writeback_job *wb,
struct line_buffer *output_buffer, size_t row_size)
{
struct vkms_plane_state **plane = crtc_state->active_planes;
- struct vkms_frame_info *primary_plane_info = plane[0]->frame_info;
u32 n_active_planes = crtc_state->num_active_planes;
- int y_dst = primary_plane_info->dst.y1;
- int h_dst = drm_rect_height(&primary_plane_info->dst);
- int y_limit = y_dst + h_dst;
+ const struct pixel_argb_u16 background_color = { .a = 0xffff };
- for (size_t y = y_dst; y < y_limit; y++) {
- plane[0]->plane_read(output_buffer, primary_plane_info, y);
+ size_t crtc_y_limit = crtc_state->base.crtc->mode.vdisplay;
- /* If there are other planes besides primary, we consider the active
- * planes should be in z-order and compose them associatively:
- * ((primary <- overlay) <- cursor)
- */
- for (size_t i = 1; i < n_active_planes; i++) {
+ for (size_t y = 0; y < crtc_y_limit; y++) {
+ fill_background(&background_color, output_buffer);
+
+ /* The active planes are composed associatively in z-order. */
+ for (size_t i = 0; i < n_active_planes; i++) {
if (!check_y_limit(plane[i]->frame_info, y))
continue;
@@ -124,14 +127,24 @@ static int check_format_funcs(struct vkms_crtc_state *crtc_state,
return 0;
}
+static int check_iosys_map(struct vkms_crtc_state *crtc_state)
+{
+ struct vkms_plane_state **plane_state = crtc_state->active_planes;
+ u32 n_active_planes = crtc_state->num_active_planes;
+
+ for (size_t i = 0; i < n_active_planes; i++)
+ if (iosys_map_is_null(&plane_state[i]->frame_info->map[0]))
+ return -1;
+
+ return 0;
+}
+
static int compose_active_planes(struct vkms_writeback_job *active_wb,
struct vkms_crtc_state *crtc_state,
u32 *crc32)
{
size_t line_width, pixel_size = sizeof(struct pixel_argb_u16);
- struct vkms_frame_info *primary_plane_info = NULL;
struct line_buffer output_buffer, stage_buffer;
- struct vkms_plane_state *act_plane = NULL;
int ret = 0;
/*
@@ -142,22 +155,13 @@ static int compose_active_planes(struct vkms_writeback_job *active_wb,
*/
static_assert(sizeof(struct pixel_argb_u16) == 8);
- if (crtc_state->num_active_planes >= 1) {
- act_plane = crtc_state->active_planes[0];
- if (act_plane->base.base.plane->type == DRM_PLANE_TYPE_PRIMARY)
- primary_plane_info = act_plane->frame_info;
- }
-
- if (!primary_plane_info)
- return -EINVAL;
-
- if (WARN_ON(iosys_map_is_null(&primary_plane_info->map[0])))
+ if (WARN_ON(check_iosys_map(crtc_state)))
return -EINVAL;
if (WARN_ON(check_format_funcs(crtc_state, active_wb)))
return -EINVAL;
- line_width = drm_rect_width(&primary_plane_info->dst);
+ line_width = crtc_state->base.crtc->mode.hdisplay;
stage_buffer.n_pixels = line_width;
output_buffer.n_pixels = line_width;
@@ -174,13 +178,6 @@ static int compose_active_planes(struct vkms_writeback_job *active_wb,
goto free_stage_buffer;
}
- if (active_wb) {
- struct vkms_frame_info *wb_frame_info = &active_wb->wb_frame_info;
-
- wb_frame_info->src = primary_plane_info->src;
- wb_frame_info->dst = primary_plane_info->dst;
- }
-
blend(active_wb, crtc_state, crc32, &stage_buffer,
&output_buffer, line_width * pixel_size);
diff --git a/drivers/gpu/drm/vkms/vkms_writeback.c b/drivers/gpu/drm/vkms/vkms_writeback.c
index d2aabb52cb46..974db5defce4 100644
--- a/drivers/gpu/drm/vkms/vkms_writeback.c
+++ b/drivers/gpu/drm/vkms/vkms_writeback.c
@@ -122,6 +122,8 @@ static void vkms_wb_atomic_commit(struct drm_connector *conn,
struct drm_connector_state *conn_state = wb_conn->base.state;
struct vkms_crtc_state *crtc_state = output->composer_state;
struct drm_framebuffer *fb = connector_state->writeback_job->fb;
+ u16 crtc_height = crtc_state->base.crtc->mode.vdisplay;
+ u16 crtc_width = crtc_state->base.crtc->mode.hdisplay;
struct vkms_writeback_job *active_wb;
struct vkms_frame_info *wb_frame_info;
u32 wb_format = fb->format->format;
@@ -143,6 +145,8 @@ static void vkms_wb_atomic_commit(struct drm_connector *conn,
spin_unlock_irq(&output->composer_lock);
drm_writeback_queue_job(wb_conn, connector_state);
active_wb->wb_write = get_line_to_frame_function(wb_format);
+ drm_rect_init(&wb_frame_info->src, 0, 0, crtc_width, crtc_height);
+ drm_rect_init(&wb_frame_info->dst, 0, 0, crtc_width, crtc_height);
}
static const struct drm_connector_helper_funcs vkms_wb_conn_helper_funcs = {
--
2.30.2
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