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compositor-drm: Split assign_planes() into separate file 

drm_assign_planes() is called to separate views out and decide what will
be taken out for plane composition and what will be left for the
renderer to compose.

It calls drm_output_propose_state() in order to find a good
configuration, which itself has a number of helpers that it calls. Break
these out into a separate file.

Signed-off-by: Daniel Stone <daniels@collabora.com>
This commit is contained in:
Daniel Stone 2019-06-22 18:40:31 +01:00
parent 6b466f25af
commit e404b72fd5
4 changed files with 812 additions and 764 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
libweston/backend-drm/drm-internal.h
View File

@ -665,3 +665,9 @@ drm_plane_state_put_back(struct drm_plane_state *state);
bool
drm_plane_state_coords_for_view(struct drm_plane_state *state,
struct weston_view *ev);
void
drm_assign_planes(struct weston_output *output_base, void *repaint_data);
bool
drm_plane_is_available(struct drm_plane *plane, struct drm_output *output);

765
libweston/backend-drm/drm.c
View File

@ -69,18 +69,6 @@
#include "linux-dmabuf-unstable-v1-server-protocol.h"
#include "linux-explicit-synchronization.h"
enum drm_output_propose_state_mode {
DRM_OUTPUT_PROPOSE_STATE_MIXED, /**< mix renderer & planes */
DRM_OUTPUT_PROPOSE_STATE_RENDERER_ONLY, /**< only assign to renderer & cursor */
DRM_OUTPUT_PROPOSE_STATE_PLANES_ONLY, /**< no renderer use, only planes */
};
static const char *const drm_output_propose_state_mode_as_string[] = {
[DRM_OUTPUT_PROPOSE_STATE_MIXED] = "mixed state",
[DRM_OUTPUT_PROPOSE_STATE_RENDERER_ONLY] = "render-only state",
[DRM_OUTPUT_PROPOSE_STATE_PLANES_ONLY] = "plane-only state"
};
static struct gl_renderer_interface *gl_renderer;
static const char default_seat[] = "seat0";
@ -155,7 +143,7 @@ drm_virtual_output_destroy(struct weston_output *output_base);
* Returns true if the plane can be used on the given output for its current
* repaint cycle.
*/
static bool
bool
drm_plane_is_available(struct drm_plane *plane, struct drm_output *output)
{
assert(plane->state_cur);
@ -289,73 +277,6 @@ drm_output_update_complete(struct drm_output *output, uint32_t flags,
weston_output_schedule_repaint(&output->base);
}
static struct drm_plane_state *
drm_output_prepare_scanout_view(struct drm_output_state *output_state,
struct weston_view *ev,
enum drm_output_propose_state_mode mode)
{
struct drm_output *output = output_state->output;
struct drm_backend *b = to_drm_backend(output->base.compositor);
struct drm_plane *scanout_plane = output->scanout_plane;
struct drm_plane_state *state;
struct drm_fb *fb;
pixman_box32_t *extents;
assert(!b->sprites_are_broken);
assert(b->atomic_modeset);
assert(mode == DRM_OUTPUT_PROPOSE_STATE_PLANES_ONLY);
/* Check the view spans exactly the output size, calculated in the
* logical co-ordinate space. */
extents = pixman_region32_extents(&ev->transform.boundingbox);
if (extents->x1 != output->base.x ||
extents->y1 != output->base.y ||
extents->x2 != output->base.x + output->base.width ||
extents->y2 != output->base.y + output->base.height)
return NULL;
/* If the surface buffer has an in-fence fd, but the plane doesn't
* support fences, we can't place the buffer on this plane. */
if (ev->surface->acquire_fence_fd >= 0 &&
scanout_plane->props[WDRM_PLANE_IN_FENCE_FD].prop_id == 0)
return NULL;
fb = drm_fb_get_from_view(output_state, ev);
if (!fb) {
drm_debug(b, "\t\t\t\t[scanout] not placing view %p on scanout: "
" couldn't get fb\n", ev);
return NULL;
}
state = drm_output_state_get_plane(output_state, scanout_plane);
/* The only way we can already have a buffer in the scanout plane is
* if we are in mixed mode, or if a client buffer has already been
* placed into scanout. The former case will never call into here,
* and in the latter case, the view must have been marked as occluded,
* meaning we should never have ended up here. */
assert(!state->fb);
state->fb = fb;
state->ev = ev;
state->output = output;
if (!drm_plane_state_coords_for_view(state, ev))
goto err;
if (state->dest_x != 0 || state->dest_y != 0 ||
state->dest_w != (unsigned) output->base.current_mode->width ||
state->dest_h != (unsigned) output->base.current_mode->height)
goto err;
state->in_fence_fd = ev->surface->acquire_fence_fd;
/* In plane-only mode, we don't need to test the state now, as we
* will only test it once at the end. */
return state;
err:
drm_plane_state_put_back(state);
return NULL;
}
static struct drm_fb *
drm_output_render_gl(struct drm_output_state *state, pixman_region32_t *damage)
@ -478,7 +399,6 @@ drm_output_render(struct drm_output_state *state, pixman_region32_t *damage)
&c->primary_plane.damage, damage);
}
static int
drm_output_repaint(struct weston_output *output_base,
pixman_region32_t *damage,
@ -694,689 +614,6 @@ drm_repaint_cancel(struct weston_compositor *compositor, void *repaint_data)
b->repaint_data = NULL;
}
static struct drm_plane_state *
drm_output_prepare_overlay_view(struct drm_output_state *output_state,
struct weston_view *ev,
enum drm_output_propose_state_mode mode)
{
struct drm_output *output = output_state->output;
struct weston_compositor *ec = output->base.compositor;
struct drm_backend *b = to_drm_backend(ec);
struct drm_plane *p;
struct drm_plane_state *state = NULL;
struct drm_fb *fb;
unsigned int i;
int ret;
enum {
NO_PLANES,
NO_PLANES_WITH_FORMAT,
NO_PLANES_ACCEPTED,
PLACED_ON_PLANE,
} availability = NO_PLANES;
assert(!b->sprites_are_broken);
assert(b->atomic_modeset);
fb = drm_fb_get_from_view(output_state, ev);
if (!fb) {
drm_debug(b, "\t\t\t\t[overlay] not placing view %p on overlay: "
" couldn't get fb\n", ev);
return NULL;
}
wl_list_for_each(p, &b->plane_list, link) {
if (p->type != WDRM_PLANE_TYPE_OVERLAY)
continue;
if (!drm_plane_is_available(p, output))
continue;
state = drm_output_state_get_plane(output_state, p);
if (state->fb) {
state = NULL;
continue;
}
if (availability == NO_PLANES)
availability = NO_PLANES_WITH_FORMAT;
/* Check whether the format is supported */
for (i = 0; i < p->count_formats; i++) {
unsigned int j;
if (p->formats[i].format != fb->format->format)
continue;
if (fb->modifier == DRM_FORMAT_MOD_INVALID)
break;
for (j = 0; j < p->formats[i].count_modifiers; j++) {
if (p->formats[i].modifiers[j] == fb->modifier)
break;
}
if (j != p->formats[i].count_modifiers)
break;
}
if (i == p->count_formats) {
drm_plane_state_put_back(state);
state = NULL;
continue;
}
if (availability == NO_PLANES_WITH_FORMAT)
availability = NO_PLANES_ACCEPTED;
state->ev = ev;
state->output = output;
if (!drm_plane_state_coords_for_view(state, ev)) {
drm_debug(b, "\t\t\t\t[overlay] not placing view %p on overlay: "
"unsuitable transform\n", ev);
drm_plane_state_put_back(state);
state = NULL;
continue;
}
/* If the surface buffer has an in-fence fd, but the plane
* doesn't support fences, we can't place the buffer on this
* plane. */
if (ev->surface->acquire_fence_fd >= 0 &&
p->props[WDRM_PLANE_IN_FENCE_FD].prop_id == 0) {
drm_debug(b, "\t\t\t\t[overlay] not placing view %p on overlay: "
"no in-fence support\n", ev);
drm_plane_state_put_back(state);
state = NULL;
continue;
}
/* We hold one reference for the lifetime of this function;
* from calling drm_fb_get_from_view, to the out label where
* we unconditionally drop the reference. So, we take another
* reference here to live within the state. */
state->fb = drm_fb_ref(fb);
state->in_fence_fd = ev->surface->acquire_fence_fd;
/* In planes-only mode, we don't have an incremental state to
* test against, so we just hope it'll work. */
if (mode == DRM_OUTPUT_PROPOSE_STATE_PLANES_ONLY) {
drm_debug(b, "\t\t\t\t[overlay] provisionally placing "
"view %p on overlay %lu in planes-only mode\n",
ev, (unsigned long) p->plane_id);
availability = PLACED_ON_PLANE;
goto out;
}
ret = drm_pending_state_test(output_state->pending_state);
if (ret == 0) {
drm_debug(b, "\t\t\t\t[overlay] provisionally placing "
"view %p on overlay %d in mixed mode\n",
ev, p->plane_id);
availability = PLACED_ON_PLANE;
goto out;
}
drm_debug(b, "\t\t\t\t[overlay] not placing view %p on overlay %lu "
"in mixed mode: kernel test failed\n",
ev, (unsigned long) p->plane_id);
drm_plane_state_put_back(state);
state = NULL;
}
switch (availability) {
case NO_PLANES:
drm_debug(b, "\t\t\t\t[overlay] not placing view %p on overlay: "
"no free overlay planes\n", ev);
break;
case NO_PLANES_WITH_FORMAT:
drm_debug(b, "\t\t\t\t[overlay] not placing view %p on overlay: "
"no free overlay planes matching format %s (0x%lx) "
"modifier 0x%llx\n",
ev, fb->format->drm_format_name,
(unsigned long) fb->format,
(unsigned long long) fb->modifier);
break;
case NO_PLANES_ACCEPTED:
case PLACED_ON_PLANE:
break;
}
out:
drm_fb_unref(fb);
return state;
}
/**
* Update the image for the current cursor surface
*
* @param plane_state DRM cursor plane state
* @param ev Source view for cursor
*/
static void
cursor_bo_update(struct drm_plane_state *plane_state, struct weston_view *ev)
{
struct drm_backend *b = plane_state->plane->backend;
struct gbm_bo *bo = plane_state->fb->bo;
struct weston_buffer *buffer = ev->surface->buffer_ref.buffer;
uint32_t buf[b->cursor_width * b->cursor_height];
int32_t stride;
uint8_t *s;
int i;
assert(buffer && buffer->shm_buffer);
assert(buffer->shm_buffer == wl_shm_buffer_get(buffer->resource));
assert(buffer->width <= b->cursor_width);
assert(buffer->height <= b->cursor_height);
memset(buf, 0, sizeof buf);
stride = wl_shm_buffer_get_stride(buffer->shm_buffer);
s = wl_shm_buffer_get_data(buffer->shm_buffer);
wl_shm_buffer_begin_access(buffer->shm_buffer);
for (i = 0; i < buffer->height; i++)
memcpy(buf + i * b->cursor_width,
s + i * stride,
buffer->width * 4);
wl_shm_buffer_end_access(buffer->shm_buffer);
if (gbm_bo_write(bo, buf, sizeof buf) < 0)
weston_log("failed update cursor: %s\n", strerror(errno));
}
static struct drm_plane_state *
drm_output_prepare_cursor_view(struct drm_output_state *output_state,
struct weston_view *ev)
{
struct drm_output *output = output_state->output;
struct drm_backend *b = to_drm_backend(output->base.compositor);
struct drm_plane *plane = output->cursor_plane;
struct drm_plane_state *plane_state;
struct wl_shm_buffer *shmbuf;
bool needs_update = false;
assert(!b->cursors_are_broken);
if (!plane)
return NULL;
if (!plane->state_cur->complete)
return NULL;
if (plane->state_cur->output && plane->state_cur->output != output)
return NULL;
/* We use GBM to import SHM buffers. */
if (b->gbm == NULL)
return NULL;
if (ev->surface->buffer_ref.buffer == NULL) {
drm_debug(b, "\t\t\t\t[cursor] not assigning view %p to cursor plane "
"(no buffer available)\n", ev);
return NULL;
}
shmbuf = wl_shm_buffer_get(ev->surface->buffer_ref.buffer->resource);
if (!shmbuf) {
drm_debug(b, "\t\t\t\t[cursor] not assigning view %p to cursor plane "
"(buffer isn't SHM)\n", ev);
return NULL;
}
if (wl_shm_buffer_get_format(shmbuf) != WL_SHM_FORMAT_ARGB8888) {
drm_debug(b, "\t\t\t\t[cursor] not assigning view %p to cursor plane "
"(format 0x%lx unsuitable)\n",
ev, (unsigned long) wl_shm_buffer_get_format(shmbuf));
return NULL;
}
plane_state =
drm_output_state_get_plane(output_state, output->cursor_plane);
if (plane_state && plane_state->fb)
return NULL;
/* We can't scale with the legacy API, and we don't try to account for
* simple cropping/translation in cursor_bo_update. */
plane_state->output = output;
if (!drm_plane_state_coords_for_view(plane_state, ev))
goto err;
if (plane_state->src_x != 0 || plane_state->src_y != 0 ||
plane_state->src_w > (unsigned) b->cursor_width << 16 ||
plane_state->src_h > (unsigned) b->cursor_height << 16 ||
plane_state->src_w != plane_state->dest_w << 16 ||
plane_state->src_h != plane_state->dest_h << 16) {
drm_debug(b, "\t\t\t\t[cursor] not assigning view %p to cursor plane "
"(positioning requires cropping or scaling)\n", ev);
goto err;
}
/* Since we're setting plane state up front, we need to work out
* whether or not we need to upload a new cursor. We can't use the
* plane damage, since the planes haven't actually been calculated
* yet: instead try to figure it out directly. KMS cursor planes are
* pretty unique here, in that they lie partway between a Weston plane
* (direct scanout) and a renderer. */
if (ev != output->cursor_view ||
pixman_region32_not_empty(&ev->surface->damage)) {
output->current_cursor++;
output->current_cursor =
output->current_cursor %
ARRAY_LENGTH(output->gbm_cursor_fb);
needs_update = true;
}
output->cursor_view = ev;
plane_state->ev = ev;
plane_state->fb =
drm_fb_ref(output->gbm_cursor_fb[output->current_cursor]);
if (needs_update) {
drm_debug(b, "\t\t\t\t[cursor] copying new content to cursor BO\n");
cursor_bo_update(plane_state, ev);
}
/* The cursor API is somewhat special: in cursor_bo_update(), we upload
* a buffer which is always cursor_width x cursor_height, even if the
* surface we want to promote is actually smaller than this. Manually
* mangle the plane state to deal with this. */
plane_state->src_w = b->cursor_width << 16;
plane_state->src_h = b->cursor_height << 16;
plane_state->dest_w = b->cursor_width;
plane_state->dest_h = b->cursor_height;
drm_debug(b, "\t\t\t\t[cursor] provisionally assigned view %p to cursor\n",
ev);
return plane_state;
err:
drm_plane_state_put_back(plane_state);
return NULL;
}
static struct drm_output_state *
drm_output_propose_state(struct weston_output *output_base,
struct drm_pending_state *pending_state,
enum drm_output_propose_state_mode mode)
{
struct drm_output *output = to_drm_output(output_base);
struct drm_backend *b = to_drm_backend(output->base.compositor);
struct drm_output_state *state;
struct drm_plane_state *scanout_state = NULL;
struct weston_view *ev;
pixman_region32_t surface_overlap, renderer_region, occluded_region;
bool planes_ok = (mode != DRM_OUTPUT_PROPOSE_STATE_RENDERER_ONLY);
bool renderer_ok = (mode != DRM_OUTPUT_PROPOSE_STATE_PLANES_ONLY);
int ret;
assert(!output->state_last);
state = drm_output_state_duplicate(output->state_cur,
pending_state,
DRM_OUTPUT_STATE_CLEAR_PLANES);
/* We implement mixed mode by progressively creating and testing
* incremental states, of scanout + overlay + cursor. Since we
* walk our views top to bottom, the scanout plane is last, however
* we always need it in our scene for the test modeset to be
* meaningful. To do this, we steal a reference to the last
* renderer framebuffer we have, if we think it's basically
* compatible. If we don't have that, then we conservatively fall
* back to only using the renderer for this repaint. */
if (mode == DRM_OUTPUT_PROPOSE_STATE_MIXED) {
struct drm_plane *plane = output->scanout_plane;
struct drm_fb *scanout_fb = plane->state_cur->fb;
if (!scanout_fb ||
(scanout_fb->type != BUFFER_GBM_SURFACE &&
scanout_fb->type != BUFFER_PIXMAN_DUMB)) {
drm_debug(b, "\t\t[state] cannot propose mixed mode: "
"for output %s (%lu): no previous renderer "
"fb\n",
output->base.name,
(unsigned long) output->base.id);
drm_output_state_free(state);
return NULL;
}
if (scanout_fb->width != output_base->current_mode->width ||
scanout_fb->height != output_base->current_mode->height) {
drm_debug(b, "\t\t[state] cannot propose mixed mode "
"for output %s (%lu): previous fb has "
"different size\n",
output->base.name,
(unsigned long) output->base.id);
drm_output_state_free(state);
return NULL;
}
scanout_state = drm_plane_state_duplicate(state,
plane->state_cur);
drm_debug(b, "\t\t[state] using renderer FB ID %lu for mixed "
"mode for output %s (%lu)\n",
(unsigned long) scanout_fb->fb_id, output->base.name,
(unsigned long) output->base.id);
}
/*
* Find a surface for each sprite in the output using some heuristics:
* 1) size
* 2) frequency of update
* 3) opacity (though some hw might support alpha blending)
* 4) clipping (this can be fixed with color keys)
*
* The idea is to save on blitting since this should save power.
* If we can get a large video surface on the sprite for example,
* the main display surface may not need to update at all, and
* the client buffer can be used directly for the sprite surface
* as we do for flipping full screen surfaces.
*/
pixman_region32_init(&renderer_region);
pixman_region32_init(&occluded_region);
wl_list_for_each(ev, &output_base->compositor->view_list, link) {
struct drm_plane_state *ps = NULL;
bool force_renderer = false;
pixman_region32_t clipped_view;
bool totally_occluded = false;
bool overlay_occluded = false;
drm_debug(b, "\t\t\t[view] evaluating view %p for "
"output %s (%lu)\n",
ev, output->base.name,
(unsigned long) output->base.id);
/* If this view doesn't touch our output at all, there's no
* reason to do anything with it. */
if (!(ev->output_mask & (1u << output->base.id))) {
drm_debug(b, "\t\t\t\t[view] ignoring view %p "
"(not on our output)\n", ev);
continue;
}
/* We only assign planes to views which are exclusively present
* on our output. */
if (ev->output_mask != (1u << output->base.id)) {
drm_debug(b, "\t\t\t\t[view] not assigning view %p to plane "
"(on multiple outputs)\n", ev);
force_renderer = true;
}
if (!ev->surface->buffer_ref.buffer) {
drm_debug(b, "\t\t\t\t[view] not assigning view %p to plane "
"(no buffer available)\n", ev);
force_renderer = true;
}
/* Ignore views we know to be totally occluded. */
pixman_region32_init(&clipped_view);
pixman_region32_intersect(&clipped_view,
&ev->transform.boundingbox,
&output->base.region);
pixman_region32_init(&surface_overlap);
pixman_region32_subtract(&surface_overlap, &clipped_view,
&occluded_region);
totally_occluded = !pixman_region32_not_empty(&surface_overlap);
if (totally_occluded) {
drm_debug(b, "\t\t\t\t[view] ignoring view %p "
"(occluded on our output)\n", ev);
pixman_region32_fini(&surface_overlap);
pixman_region32_fini(&clipped_view);
continue;
}
/* Since we process views from top to bottom, we know that if
* the view intersects the calculated renderer region, it must
* be part of, or occluded by, it, and cannot go on a plane. */
pixman_region32_intersect(&surface_overlap, &renderer_region,
&clipped_view);
if (pixman_region32_not_empty(&surface_overlap)) {
drm_debug(b, "\t\t\t\t[view] not assigning view %p to plane "
"(occluded by renderer views)\n", ev);
force_renderer = true;
}
/* We do not control the stacking order of overlay planes;
* the scanout plane is strictly stacked bottom and the cursor
* plane top, but the ordering of overlay planes with respect
* to each other is undefined. Make sure we do not have two
* planes overlapping each other. */
pixman_region32_intersect(&surface_overlap, &occluded_region,
&clipped_view);
if (pixman_region32_not_empty(&surface_overlap)) {
drm_debug(b, "\t\t\t\t[view] not assigning view %p to plane "
"(occluded by other overlay planes)\n", ev);
overlay_occluded = true;
}
pixman_region32_fini(&surface_overlap);
/* The cursor plane is 'special' in the sense that we can still
* place it in the legacy API, and we gate that with a separate
* cursors_are_broken flag. */
if (!force_renderer && !overlay_occluded && !b->cursors_are_broken)
ps = drm_output_prepare_cursor_view(state, ev);
/* If sprites are disabled or the view is not fully opaque, we
* must put the view into the renderer - unless it has already
* been placed in the cursor plane, which can handle alpha. */
if (!ps && !planes_ok) {
drm_debug(b, "\t\t\t\t[view] not assigning view %p to plane "
"(precluded by mode)\n", ev);
force_renderer = true;
}
if (!ps && !weston_view_is_opaque(ev, &clipped_view)) {
drm_debug(b, "\t\t\t\t[view] not assigning view %p to plane "
"(view not fully opaque)\n", ev);
force_renderer = true;
}
/* Only try to place scanout surfaces in planes-only mode; in
* mixed mode, we have already failed to place a view on the
* scanout surface, forcing usage of the renderer on the
* scanout plane. */
if (!ps && !force_renderer && !renderer_ok)
ps = drm_output_prepare_scanout_view(state, ev, mode);
if (!ps && !overlay_occluded && !force_renderer)
ps = drm_output_prepare_overlay_view(state, ev, mode);
if (ps) {
/* If we have been assigned to an overlay or scanout
* plane, add this area to the occluded region, so
* other views are known to be behind it. The cursor
* plane, however, is special, in that it blends with
* the content underneath it: the area should neither
* be added to the renderer region nor the occluded
* region. */
if (ps->plane->type != WDRM_PLANE_TYPE_CURSOR) {
pixman_region32_union(&occluded_region,
&occluded_region,
&clipped_view);
pixman_region32_fini(&clipped_view);
}
continue;
}
/* We have been assigned to the primary (renderer) plane:
* check if this is OK, and add ourselves to the renderer
* region if so. */
if (!renderer_ok) {
drm_debug(b, "\t\t[view] failing state generation: "
"placing view %p to renderer not allowed\n",
ev);
pixman_region32_fini(&clipped_view);
goto err_region;
}
pixman_region32_union(&renderer_region,
&renderer_region,
&clipped_view);
pixman_region32_fini(&clipped_view);
}
pixman_region32_fini(&renderer_region);
pixman_region32_fini(&occluded_region);
/* In renderer-only mode, we can't test the state as we don't have a
* renderer buffer yet. */
if (mode == DRM_OUTPUT_PROPOSE_STATE_RENDERER_ONLY)
return state;
/* Check to see if this state will actually work. */
ret = drm_pending_state_test(state->pending_state);
if (ret != 0) {
drm_debug(b, "\t\t[view] failing state generation: "
"atomic test not OK\n");
goto err;
}
/* Counterpart to duplicating scanout state at the top of this
* function: if we have taken a renderer framebuffer and placed it in
* the pending state in order to incrementally test overlay planes,
* remove it now. */
if (mode == DRM_OUTPUT_PROPOSE_STATE_MIXED) {
assert(scanout_state->fb->type == BUFFER_GBM_SURFACE ||
scanout_state->fb->type == BUFFER_PIXMAN_DUMB);
drm_plane_state_put_back(scanout_state);
}
return state;
err_region:
pixman_region32_fini(&renderer_region);
pixman_region32_fini(&occluded_region);
err:
drm_output_state_free(state);
return NULL;
}
static const char *
drm_propose_state_mode_to_string(enum drm_output_propose_state_mode mode)
{
if (mode < 0 || mode >= ARRAY_LENGTH(drm_output_propose_state_mode_as_string))
return " unknown compositing mode";
return drm_output_propose_state_mode_as_string[mode];
}
static void
drm_assign_planes(struct weston_output *output_base, void *repaint_data)
{
struct drm_backend *b = to_drm_backend(output_base->compositor);
struct drm_pending_state *pending_state = repaint_data;
struct drm_output *output = to_drm_output(output_base);
struct drm_output_state *state = NULL;
struct drm_plane_state *plane_state;
struct weston_view *ev;
struct weston_plane *primary = &output_base->compositor->primary_plane;
enum drm_output_propose_state_mode mode = DRM_OUTPUT_PROPOSE_STATE_PLANES_ONLY;
drm_debug(b, "\t[repaint] preparing state for output %s (%lu)\n",
output_base->name, (unsigned long) output_base->id);
if (!b->sprites_are_broken && !output->virtual) {
drm_debug(b, "\t[repaint] trying planes-only build state\n");
state = drm_output_propose_state(output_base, pending_state, mode);
if (!state) {
drm_debug(b, "\t[repaint] could not build planes-only "
"state, trying mixed\n");
mode = DRM_OUTPUT_PROPOSE_STATE_MIXED;
state = drm_output_propose_state(output_base,
pending_state,
mode);
}
if (!state) {
drm_debug(b, "\t[repaint] could not build mixed-mode "
"state, trying renderer-only\n");
}
} else {
drm_debug(b, "\t[state] no overlay plane support\n");
}
if (!state) {
mode = DRM_OUTPUT_PROPOSE_STATE_RENDERER_ONLY;
state = drm_output_propose_state(output_base, pending_state,
mode);
}
assert(state);
drm_debug(b, "\t[repaint] Using %s composition\n",
drm_propose_state_mode_to_string(mode));
wl_list_for_each(ev, &output_base->compositor->view_list, link) {
struct drm_plane *target_plane = NULL;
/* If this view doesn't touch our output at all, there's no
* reason to do anything with it. */
if (!(ev->output_mask & (1u << output->base.id)))
continue;
/* Test whether this buffer can ever go into a plane:
* non-shm, or small enough to be a cursor.
*
* Also, keep a reference when using the pixman renderer.
* That makes it possible to do a seamless switch to the GL
* renderer and since the pixman renderer keeps a reference
* to the buffer anyway, there is no side effects.
*/
if (b->use_pixman ||
(ev->surface->buffer_ref.buffer &&
(!wl_shm_buffer_get(ev->surface->buffer_ref.buffer->resource) ||
(ev->surface->width <= b->cursor_width &&
ev->surface->height <= b->cursor_height))))
ev->surface->keep_buffer = true;
else
ev->surface->keep_buffer = false;
/* This is a bit unpleasant, but lacking a temporary place to
* hang a plane off the view, we have to do a nested walk.
* Our first-order iteration has to be planes rather than
* views, because otherwise we won't reset views which were
* previously on planes to being on the primary plane. */
wl_list_for_each(plane_state, &state->plane_list, link) {
if (plane_state->ev == ev) {
plane_state->ev = NULL;
target_plane = plane_state->plane;
break;
}
}
if (target_plane) {
drm_debug(b, "\t[repaint] view %p on %s plane %lu\n",
ev, plane_type_enums[target_plane->type].name,
(unsigned long) target_plane->plane_id);
weston_view_move_to_plane(ev, &target_plane->base);
} else {
drm_debug(b, "\t[repaint] view %p using renderer "
"composition\n", ev);
weston_view_move_to_plane(ev, primary);
}
if (!target_plane ||
target_plane->type == WDRM_PLANE_TYPE_CURSOR) {
/* cursor plane & renderer involve a copy */
ev->psf_flags = 0;
} else {
/* All other planes are a direct scanout of a
* single client buffer.
*/
ev->psf_flags = WP_PRESENTATION_FEEDBACK_KIND_ZERO_COPY;
}
}
/* We rely on output->cursor_view being both an accurate reflection of
* the cursor plane's state, but also being maintained across repaints
* to avoid unnecessary damage uploads, per the comment in
* drm_output_prepare_cursor_view. In the event that we go from having
* a cursor view to not having a cursor view, we need to clear it. */
if (output->cursor_view) {
plane_state =
drm_output_state_get_existing_plane(state,
output->cursor_plane);
if (!plane_state || !plane_state->fb)
output->cursor_view = NULL;
}
}
static int
drm_output_init_egl(struct drm_output *output, struct drm_backend *b);
static void

1
libweston/backend-drm/meson.build
View File

@ -25,6 +25,7 @@ srcs_drm = [
'modes.c',
'kms.c',
'state-helpers.c',
'state-propose.c',
linux_dmabuf_unstable_v1_protocol_c,
linux_dmabuf_unstable_v1_server_protocol_h,
presentation_time_server_protocol_h,

804
libweston/backend-drm/state-propose.c Normal file
View File

@ -0,0 +1,804 @@
/*
* Copyright © 2008-2011 Kristian Høgsberg
* Copyright © 2011 Intel Corporation
* Copyright © 2017, 2018 Collabora, Ltd.
* Copyright © 2017, 2018 General Electric Company
* Copyright (c) 2018 DisplayLink (UK) Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "config.h"
#include <xf86drm.h>
#include <xf86drmMode.h>
#include <libweston/libweston.h>
#include <libweston/backend-drm.h>
#include <libweston/pixel-formats.h>
#include "drm-internal.h"
#include "linux-dmabuf.h"
#include "presentation-time-server-protocol.h"
enum drm_output_propose_state_mode {
DRM_OUTPUT_PROPOSE_STATE_MIXED, /**< mix renderer & planes */
DRM_OUTPUT_PROPOSE_STATE_RENDERER_ONLY, /**< only assign to renderer & cursor */
DRM_OUTPUT_PROPOSE_STATE_PLANES_ONLY, /**< no renderer use, only planes */
};
static const char *const drm_output_propose_state_mode_as_string[] = {
[DRM_OUTPUT_PROPOSE_STATE_MIXED] = "mixed state",
[DRM_OUTPUT_PROPOSE_STATE_RENDERER_ONLY] = "render-only state",
[DRM_OUTPUT_PROPOSE_STATE_PLANES_ONLY] = "plane-only state"
};
static const char *
drm_propose_state_mode_to_string(enum drm_output_propose_state_mode mode)
{
if (mode < 0 || mode >= ARRAY_LENGTH(drm_output_propose_state_mode_as_string))
return " unknown compositing mode";
return drm_output_propose_state_mode_as_string[mode];
}
static struct drm_plane_state *
drm_output_prepare_overlay_view(struct drm_output_state *output_state,
struct weston_view *ev,
enum drm_output_propose_state_mode mode)
{
struct drm_output *output = output_state->output;
struct weston_compositor *ec = output->base.compositor;
struct drm_backend *b = to_drm_backend(ec);
struct drm_plane *p;
struct drm_plane_state *state = NULL;
struct drm_fb *fb;
unsigned int i;
int ret;
enum {
NO_PLANES,
NO_PLANES_WITH_FORMAT,
NO_PLANES_ACCEPTED,
PLACED_ON_PLANE,
} availability = NO_PLANES;
assert(!b->sprites_are_broken);
assert(b->atomic_modeset);
fb = drm_fb_get_from_view(output_state, ev);
if (!fb) {
drm_debug(b, "\t\t\t\t[overlay] not placing view %p on overlay: "
" couldn't get fb\n", ev);
return NULL;
}
wl_list_for_each(p, &b->plane_list, link) {
if (p->type != WDRM_PLANE_TYPE_OVERLAY)
continue;
if (!drm_plane_is_available(p, output))
continue;
state = drm_output_state_get_plane(output_state, p);
if (state->fb) {
state = NULL;
continue;
}
if (availability == NO_PLANES)
availability = NO_PLANES_WITH_FORMAT;
/* Check whether the format is supported */
for (i = 0; i < p->count_formats; i++) {
unsigned int j;
if (p->formats[i].format != fb->format->format)
continue;
if (fb->modifier == DRM_FORMAT_MOD_INVALID)
break;
for (j = 0; j < p->formats[i].count_modifiers; j++) {
if (p->formats[i].modifiers[j] == fb->modifier)
break;
}
if (j != p->formats[i].count_modifiers)
break;
}
if (i == p->count_formats) {
drm_plane_state_put_back(state);
state = NULL;
continue;
}
if (availability == NO_PLANES_WITH_FORMAT)
availability = NO_PLANES_ACCEPTED;
state->ev = ev;
state->output = output;
if (!drm_plane_state_coords_for_view(state, ev)) {
drm_debug(b, "\t\t\t\t[overlay] not placing view %p on overlay: "
"unsuitable transform\n", ev);
drm_plane_state_put_back(state);
state = NULL;
continue;
}
/* If the surface buffer has an in-fence fd, but the plane
* doesn't support fences, we can't place the buffer on this
* plane. */
if (ev->surface->acquire_fence_fd >= 0 &&
p->props[WDRM_PLANE_IN_FENCE_FD].prop_id == 0) {
drm_debug(b, "\t\t\t\t[overlay] not placing view %p on overlay: "
"no in-fence support\n", ev);
drm_plane_state_put_back(state);
state = NULL;
continue;
}
/* We hold one reference for the lifetime of this function;
* from calling drm_fb_get_from_view, to the out label where
* we unconditionally drop the reference. So, we take another
* reference here to live within the state. */
state->fb = drm_fb_ref(fb);
state->in_fence_fd = ev->surface->acquire_fence_fd;
/* In planes-only mode, we don't have an incremental state to
* test against, so we just hope it'll work. */
if (mode == DRM_OUTPUT_PROPOSE_STATE_PLANES_ONLY) {
drm_debug(b, "\t\t\t\t[overlay] provisionally placing "
"view %p on overlay %lu in planes-only mode\n",
ev, (unsigned long) p->plane_id);
availability = PLACED_ON_PLANE;
goto out;
}
ret = drm_pending_state_test(output_state->pending_state);
if (ret == 0) {
drm_debug(b, "\t\t\t\t[overlay] provisionally placing "
"view %p on overlay %d in mixed mode\n",
ev, p->plane_id);
availability = PLACED_ON_PLANE;
goto out;
}
drm_debug(b, "\t\t\t\t[overlay] not placing view %p on overlay %lu "
"in mixed mode: kernel test failed\n",
ev, (unsigned long) p->plane_id);
drm_plane_state_put_back(state);
state = NULL;
}
switch (availability) {
case NO_PLANES:
drm_debug(b, "\t\t\t\t[overlay] not placing view %p on overlay: "
"no free overlay planes\n", ev);
break;
case NO_PLANES_WITH_FORMAT:
drm_debug(b, "\t\t\t\t[overlay] not placing view %p on overlay: "
"no free overlay planes matching format %s (0x%lx) "
"modifier 0x%llx\n",
ev, fb->format->drm_format_name,
(unsigned long) fb->format,
(unsigned long long) fb->modifier);
break;
case NO_PLANES_ACCEPTED:
case PLACED_ON_PLANE:
break;
}
out:
drm_fb_unref(fb);
return state;
}
/**
* Update the image for the current cursor surface
*
* @param plane_state DRM cursor plane state
* @param ev Source view for cursor
*/
static void
cursor_bo_update(struct drm_plane_state *plane_state, struct weston_view *ev)
{
struct drm_backend *b = plane_state->plane->backend;
struct gbm_bo *bo = plane_state->fb->bo;
struct weston_buffer *buffer = ev->surface->buffer_ref.buffer;
uint32_t buf[b->cursor_width * b->cursor_height];
int32_t stride;
uint8_t *s;
int i;
assert(buffer && buffer->shm_buffer);
assert(buffer->shm_buffer == wl_shm_buffer_get(buffer->resource));
assert(buffer->width <= b->cursor_width);
assert(buffer->height <= b->cursor_height);
memset(buf, 0, sizeof buf);
stride = wl_shm_buffer_get_stride(buffer->shm_buffer);
s = wl_shm_buffer_get_data(buffer->shm_buffer);
wl_shm_buffer_begin_access(buffer->shm_buffer);
for (i = 0; i < buffer->height; i++)
memcpy(buf + i * b->cursor_width,
s + i * stride,
buffer->width * 4);
wl_shm_buffer_end_access(buffer->shm_buffer);
if (gbm_bo_write(bo, buf, sizeof buf) < 0)
weston_log("failed update cursor: %s\n", strerror(errno));
}
static struct drm_plane_state *
drm_output_prepare_cursor_view(struct drm_output_state *output_state,
struct weston_view *ev)
{
struct drm_output *output = output_state->output;
struct drm_backend *b = to_drm_backend(output->base.compositor);
struct drm_plane *plane = output->cursor_plane;
struct drm_plane_state *plane_state;
struct wl_shm_buffer *shmbuf;
bool needs_update = false;
assert(!b->cursors_are_broken);
if (!plane)
return NULL;
if (!plane->state_cur->complete)
return NULL;
if (plane->state_cur->output && plane->state_cur->output != output)
return NULL;
/* We use GBM to import SHM buffers. */
if (b->gbm == NULL)
return NULL;
if (ev->surface->buffer_ref.buffer == NULL) {
drm_debug(b, "\t\t\t\t[cursor] not assigning view %p to cursor plane "
"(no buffer available)\n", ev);
return NULL;
}
shmbuf = wl_shm_buffer_get(ev->surface->buffer_ref.buffer->resource);
if (!shmbuf) {
drm_debug(b, "\t\t\t\t[cursor] not assigning view %p to cursor plane "
"(buffer isn't SHM)\n", ev);
return NULL;
}
if (wl_shm_buffer_get_format(shmbuf) != WL_SHM_FORMAT_ARGB8888) {
drm_debug(b, "\t\t\t\t[cursor] not assigning view %p to cursor plane "
"(format 0x%lx unsuitable)\n",
ev, (unsigned long) wl_shm_buffer_get_format(shmbuf));
return NULL;
}
plane_state =
drm_output_state_get_plane(output_state, output->cursor_plane);
if (plane_state && plane_state->fb)
return NULL;
/* We can't scale with the legacy API, and we don't try to account for
* simple cropping/translation in cursor_bo_update. */
plane_state->output = output;
if (!drm_plane_state_coords_for_view(plane_state, ev))
goto err;
if (plane_state->src_x != 0 || plane_state->src_y != 0 ||
plane_state->src_w > (unsigned) b->cursor_width << 16 ||
plane_state->src_h > (unsigned) b->cursor_height << 16 ||
plane_state->src_w != plane_state->dest_w << 16 ||
plane_state->src_h != plane_state->dest_h << 16) {
drm_debug(b, "\t\t\t\t[cursor] not assigning view %p to cursor plane "
"(positioning requires cropping or scaling)\n", ev);
goto err;
}
/* Since we're setting plane state up front, we need to work out
* whether or not we need to upload a new cursor. We can't use the
* plane damage, since the planes haven't actually been calculated
* yet: instead try to figure it out directly. KMS cursor planes are
* pretty unique here, in that they lie partway between a Weston plane
* (direct scanout) and a renderer. */
if (ev != output->cursor_view ||
pixman_region32_not_empty(&ev->surface->damage)) {
output->current_cursor++;
output->current_cursor =
output->current_cursor %
ARRAY_LENGTH(output->gbm_cursor_fb);
needs_update = true;
}
output->cursor_view = ev;
plane_state->ev = ev;
plane_state->fb =
drm_fb_ref(output->gbm_cursor_fb[output->current_cursor]);
if (needs_update) {
drm_debug(b, "\t\t\t\t[cursor] copying new content to cursor BO\n");
cursor_bo_update(plane_state, ev);
}
/* The cursor API is somewhat special: in cursor_bo_update(), we upload
* a buffer which is always cursor_width x cursor_height, even if the
* surface we want to promote is actually smaller than this. Manually
* mangle the plane state to deal with this. */
plane_state->src_w = b->cursor_width << 16;
plane_state->src_h = b->cursor_height << 16;
plane_state->dest_w = b->cursor_width;
plane_state->dest_h = b->cursor_height;
drm_debug(b, "\t\t\t\t[cursor] provisionally assigned view %p to cursor\n",
ev);
return plane_state;
err:
drm_plane_state_put_back(plane_state);
return NULL;
}
static struct drm_plane_state *
drm_output_prepare_scanout_view(struct drm_output_state *output_state,
struct weston_view *ev,
enum drm_output_propose_state_mode mode)
{
struct drm_output *output = output_state->output;
struct drm_backend *b = to_drm_backend(output->base.compositor);
struct drm_plane *scanout_plane = output->scanout_plane;
struct drm_plane_state *state;
struct drm_fb *fb;
pixman_box32_t *extents;
assert(!b->sprites_are_broken);
assert(b->atomic_modeset);
assert(mode == DRM_OUTPUT_PROPOSE_STATE_PLANES_ONLY);
/* Check the view spans exactly the output size, calculated in the
* logical co-ordinate space. */
extents = pixman_region32_extents(&ev->transform.boundingbox);
if (extents->x1 != output->base.x ||
extents->y1 != output->base.y ||
extents->x2 != output->base.x + output->base.width ||
extents->y2 != output->base.y + output->base.height)
return NULL;
/* If the surface buffer has an in-fence fd, but the plane doesn't
* support fences, we can't place the buffer on this plane. */
if (ev->surface->acquire_fence_fd >= 0 &&
scanout_plane->props[WDRM_PLANE_IN_FENCE_FD].prop_id == 0)
return NULL;
fb = drm_fb_get_from_view(output_state, ev);
if (!fb) {
drm_debug(b, "\t\t\t\t[scanout] not placing view %p on scanout: "
" couldn't get fb\n", ev);
return NULL;
}
state = drm_output_state_get_plane(output_state, scanout_plane);
/* The only way we can already have a buffer in the scanout plane is
* if we are in mixed mode, or if a client buffer has already been
* placed into scanout. The former case will never call into here,
* and in the latter case, the view must have been marked as occluded,
* meaning we should never have ended up here. */
assert(!state->fb);
state->fb = fb;
state->ev = ev;
state->output = output;
if (!drm_plane_state_coords_for_view(state, ev))
goto err;
if (state->dest_x != 0 || state->dest_y != 0 ||
state->dest_w != (unsigned) output->base.current_mode->width ||
state->dest_h != (unsigned) output->base.current_mode->height)
goto err;
state->in_fence_fd = ev->surface->acquire_fence_fd;
/* In plane-only mode, we don't need to test the state now, as we
* will only test it once at the end. */
return state;
err:
drm_plane_state_put_back(state);
return NULL;
}
static struct drm_output_state *
drm_output_propose_state(struct weston_output *output_base,
struct drm_pending_state *pending_state,
enum drm_output_propose_state_mode mode)
{
struct drm_output *output = to_drm_output(output_base);
struct drm_backend *b = to_drm_backend(output->base.compositor);
struct drm_output_state *state;
struct drm_plane_state *scanout_state = NULL;
struct weston_view *ev;
pixman_region32_t surface_overlap, renderer_region, occluded_region;
bool planes_ok = (mode != DRM_OUTPUT_PROPOSE_STATE_RENDERER_ONLY);
bool renderer_ok = (mode != DRM_OUTPUT_PROPOSE_STATE_PLANES_ONLY);
int ret;
assert(!output->state_last);
state = drm_output_state_duplicate(output->state_cur,
pending_state,
DRM_OUTPUT_STATE_CLEAR_PLANES);
/* We implement mixed mode by progressively creating and testing
* incremental states, of scanout + overlay + cursor. Since we
* walk our views top to bottom, the scanout plane is last, however
* we always need it in our scene for the test modeset to be
* meaningful. To do this, we steal a reference to the last
* renderer framebuffer we have, if we think it's basically
* compatible. If we don't have that, then we conservatively fall
* back to only using the renderer for this repaint. */
if (mode == DRM_OUTPUT_PROPOSE_STATE_MIXED) {
struct drm_plane *plane = output->scanout_plane;
struct drm_fb *scanout_fb = plane->state_cur->fb;
if (!scanout_fb ||
(scanout_fb->type != BUFFER_GBM_SURFACE &&
scanout_fb->type != BUFFER_PIXMAN_DUMB)) {
drm_debug(b, "\t\t[state] cannot propose mixed mode: "
"for output %s (%lu): no previous renderer "
"fb\n",
output->base.name,
(unsigned long) output->base.id);
drm_output_state_free(state);
return NULL;
}
if (scanout_fb->width != output_base->current_mode->width ||
scanout_fb->height != output_base->current_mode->height) {
drm_debug(b, "\t\t[state] cannot propose mixed mode "
"for output %s (%lu): previous fb has "
"different size\n",
output->base.name,
(unsigned long) output->base.id);
drm_output_state_free(state);
return NULL;
}
scanout_state = drm_plane_state_duplicate(state,
plane->state_cur);
drm_debug(b, "\t\t[state] using renderer FB ID %lu for mixed "
"mode for output %s (%lu)\n",
(unsigned long) scanout_fb->fb_id, output->base.name,
(unsigned long) output->base.id);
}
/*
* Find a surface for each sprite in the output using some heuristics:
* 1) size
* 2) frequency of update
* 3) opacity (though some hw might support alpha blending)
* 4) clipping (this can be fixed with color keys)
*
* The idea is to save on blitting since this should save power.
* If we can get a large video surface on the sprite for example,
* the main display surface may not need to update at all, and
* the client buffer can be used directly for the sprite surface
* as we do for flipping full screen surfaces.
*/
pixman_region32_init(&renderer_region);
pixman_region32_init(&occluded_region);
wl_list_for_each(ev, &output_base->compositor->view_list, link) {
struct drm_plane_state *ps = NULL;
bool force_renderer = false;
pixman_region32_t clipped_view;
bool totally_occluded = false;
bool overlay_occluded = false;
drm_debug(b, "\t\t\t[view] evaluating view %p for "
"output %s (%lu)\n",
ev, output->base.name,
(unsigned long) output->base.id);
/* If this view doesn't touch our output at all, there's no
* reason to do anything with it. */
if (!(ev->output_mask & (1u << output->base.id))) {
drm_debug(b, "\t\t\t\t[view] ignoring view %p "
"(not on our output)\n", ev);
continue;
}
/* We only assign planes to views which are exclusively present
* on our output. */
if (ev->output_mask != (1u << output->base.id)) {
drm_debug(b, "\t\t\t\t[view] not assigning view %p to plane "
"(on multiple outputs)\n", ev);
force_renderer = true;
}
if (!ev->surface->buffer_ref.buffer) {
drm_debug(b, "\t\t\t\t[view] not assigning view %p to plane "
"(no buffer available)\n", ev);
force_renderer = true;
}
/* Ignore views we know to be totally occluded. */
pixman_region32_init(&clipped_view);
pixman_region32_intersect(&clipped_view,
&ev->transform.boundingbox,
&output->base.region);
pixman_region32_init(&surface_overlap);
pixman_region32_subtract(&surface_overlap, &clipped_view,
&occluded_region);
totally_occluded = !pixman_region32_not_empty(&surface_overlap);
if (totally_occluded) {
drm_debug(b, "\t\t\t\t[view] ignoring view %p "
"(occluded on our output)\n", ev);
pixman_region32_fini(&surface_overlap);
pixman_region32_fini(&clipped_view);
continue;
}
/* Since we process views from top to bottom, we know that if
* the view intersects the calculated renderer region, it must
* be part of, or occluded by, it, and cannot go on a plane. */
pixman_region32_intersect(&surface_overlap, &renderer_region,
&clipped_view);
if (pixman_region32_not_empty(&surface_overlap)) {
drm_debug(b, "\t\t\t\t[view] not assigning view %p to plane "
"(occluded by renderer views)\n", ev);
force_renderer = true;
}
/* We do not control the stacking order of overlay planes;
* the scanout plane is strictly stacked bottom and the cursor
* plane top, but the ordering of overlay planes with respect
* to each other is undefined. Make sure we do not have two
* planes overlapping each other. */
pixman_region32_intersect(&surface_overlap, &occluded_region,
&clipped_view);
if (pixman_region32_not_empty(&surface_overlap)) {
drm_debug(b, "\t\t\t\t[view] not assigning view %p to plane "
"(occluded by other overlay planes)\n", ev);
overlay_occluded = true;
}
pixman_region32_fini(&surface_overlap);
/* The cursor plane is 'special' in the sense that we can still
* place it in the legacy API, and we gate that with a separate
* cursors_are_broken flag. */
if (!force_renderer && !overlay_occluded && !b->cursors_are_broken)
ps = drm_output_prepare_cursor_view(state, ev);
/* If sprites are disabled or the view is not fully opaque, we
* must put the view into the renderer - unless it has already
* been placed in the cursor plane, which can handle alpha. */
if (!ps && !planes_ok) {
drm_debug(b, "\t\t\t\t[view] not assigning view %p to plane "
"(precluded by mode)\n", ev);
force_renderer = true;
}
if (!ps && !weston_view_is_opaque(ev, &clipped_view)) {
drm_debug(b, "\t\t\t\t[view] not assigning view %p to plane "
"(view not fully opaque)\n", ev);
force_renderer = true;
}
/* Only try to place scanout surfaces in planes-only mode; in
* mixed mode, we have already failed to place a view on the
* scanout surface, forcing usage of the renderer on the
* scanout plane. */
if (!ps && !force_renderer && !renderer_ok)
ps = drm_output_prepare_scanout_view(state, ev, mode);
if (!ps && !overlay_occluded && !force_renderer)
ps = drm_output_prepare_overlay_view(state, ev, mode);
if (ps) {
/* If we have been assigned to an overlay or scanout
* plane, add this area to the occluded region, so
* other views are known to be behind it. The cursor
* plane, however, is special, in that it blends with
* the content underneath it: the area should neither
* be added to the renderer region nor the occluded
* region. */
if (ps->plane->type != WDRM_PLANE_TYPE_CURSOR) {
pixman_region32_union(&occluded_region,
&occluded_region,
&clipped_view);
pixman_region32_fini(&clipped_view);
}
continue;
}
/* We have been assigned to the primary (renderer) plane:
* check if this is OK, and add ourselves to the renderer
* region if so. */
if (!renderer_ok) {
drm_debug(b, "\t\t[view] failing state generation: "
"placing view %p to renderer not allowed\n",
ev);
pixman_region32_fini(&clipped_view);
goto err_region;
}
pixman_region32_union(&renderer_region,
&renderer_region,
&clipped_view);
pixman_region32_fini(&clipped_view);
}
pixman_region32_fini(&renderer_region);
pixman_region32_fini(&occluded_region);
/* In renderer-only mode, we can't test the state as we don't have a
* renderer buffer yet. */
if (mode == DRM_OUTPUT_PROPOSE_STATE_RENDERER_ONLY)
return state;
/* Check to see if this state will actually work. */
ret = drm_pending_state_test(state->pending_state);
if (ret != 0) {
drm_debug(b, "\t\t[view] failing state generation: "
"atomic test not OK\n");
goto err;
}
/* Counterpart to duplicating scanout state at the top of this
* function: if we have taken a renderer framebuffer and placed it in
* the pending state in order to incrementally test overlay planes,
* remove it now. */
if (mode == DRM_OUTPUT_PROPOSE_STATE_MIXED) {
assert(scanout_state->fb->type == BUFFER_GBM_SURFACE ||
scanout_state->fb->type == BUFFER_PIXMAN_DUMB);
drm_plane_state_put_back(scanout_state);
}
return state;
err_region:
pixman_region32_fini(&renderer_region);
pixman_region32_fini(&occluded_region);
err:
drm_output_state_free(state);
return NULL;
}
void
drm_assign_planes(struct weston_output *output_base, void *repaint_data)
{
struct drm_backend *b = to_drm_backend(output_base->compositor);
struct drm_pending_state *pending_state = repaint_data;
struct drm_output *output = to_drm_output(output_base);
struct drm_output_state *state = NULL;
struct drm_plane_state *plane_state;
struct weston_view *ev;
struct weston_plane *primary = &output_base->compositor->primary_plane;
enum drm_output_propose_state_mode mode = DRM_OUTPUT_PROPOSE_STATE_PLANES_ONLY;
drm_debug(b, "\t[repaint] preparing state for output %s (%lu)\n",
output_base->name, (unsigned long) output_base->id);
if (!b->sprites_are_broken && !output->virtual) {
drm_debug(b, "\t[repaint] trying planes-only build state\n");
state = drm_output_propose_state(output_base, pending_state, mode);
if (!state) {
drm_debug(b, "\t[repaint] could not build planes-only "
"state, trying mixed\n");
mode = DRM_OUTPUT_PROPOSE_STATE_MIXED;
state = drm_output_propose_state(output_base,
pending_state,
mode);
}
if (!state) {
drm_debug(b, "\t[repaint] could not build mixed-mode "
"state, trying renderer-only\n");
}
} else {
drm_debug(b, "\t[state] no overlay plane support\n");
}
if (!state) {
mode = DRM_OUTPUT_PROPOSE_STATE_RENDERER_ONLY;
state = drm_output_propose_state(output_base, pending_state,
mode);
}
assert(state);
drm_debug(b, "\t[repaint] Using %s composition\n",
drm_propose_state_mode_to_string(mode));
wl_list_for_each(ev, &output_base->compositor->view_list, link) {
struct drm_plane *target_plane = NULL;
/* If this view doesn't touch our output at all, there's no
* reason to do anything with it. */
if (!(ev->output_mask & (1u << output->base.id)))
continue;
/* Test whether this buffer can ever go into a plane:
* non-shm, or small enough to be a cursor.
*
* Also, keep a reference when using the pixman renderer.
* That makes it possible to do a seamless switch to the GL
* renderer and since the pixman renderer keeps a reference
* to the buffer anyway, there is no side effects.
*/
if (b->use_pixman ||
(ev->surface->buffer_ref.buffer &&
(!wl_shm_buffer_get(ev->surface->buffer_ref.buffer->resource) ||
(ev->surface->width <= b->cursor_width &&
ev->surface->height <= b->cursor_height))))
ev->surface->keep_buffer = true;
else
ev->surface->keep_buffer = false;
/* This is a bit unpleasant, but lacking a temporary place to
* hang a plane off the view, we have to do a nested walk.
* Our first-order iteration has to be planes rather than
* views, because otherwise we won't reset views which were
* previously on planes to being on the primary plane. */
wl_list_for_each(plane_state, &state->plane_list, link) {
if (plane_state->ev == ev) {
plane_state->ev = NULL;
target_plane = plane_state->plane;
break;
}
}
if (target_plane) {
drm_debug(b, "\t[repaint] view %p on %s plane %lu\n",
ev, plane_type_enums[target_plane->type].name,
(unsigned long) target_plane->plane_id);
weston_view_move_to_plane(ev, &target_plane->base);
} else {
drm_debug(b, "\t[repaint] view %p using renderer "
"composition\n", ev);
weston_view_move_to_plane(ev, primary);
}
if (!target_plane ||
target_plane->type == WDRM_PLANE_TYPE_CURSOR) {
/* cursor plane & renderer involve a copy */
ev->psf_flags = 0;
} else {
/* All other planes are a direct scanout of a
* single client buffer.
*/
ev->psf_flags = WP_PRESENTATION_FEEDBACK_KIND_ZERO_COPY;
}
}
/* We rely on output->cursor_view being both an accurate reflection of
* the cursor plane's state, but also being maintained across repaints
* to avoid unnecessary damage uploads, per the comment in
* drm_output_prepare_cursor_view. In the event that we go from having
* a cursor view to not having a cursor view, we need to clear it. */
if (output->cursor_view) {
plane_state =
drm_output_state_get_existing_plane(state,
output->cursor_plane);
if (!plane_state || !plane_state->fb)
output->cursor_view = NULL;
}
}