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drm: add support for DMA-BUFs 

Mesa's Vulkan WSI still uses wl_drm when modifiers aren't supported.
This has been fixed in [1] but will take some time to be propagated
to users. In the meantime, add a fallback.

[1]: https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4942
This commit is contained in:
Simon Ser 2021-06-30 15:41:56 +02:00 committed by Simon Zeni
parent f7e3d325fe
commit c868e509b7
2 changed files with 141 additions and 6 deletions
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16
include/wlr/types/wlr_drm.h
View File

@ -13,6 +13,15 @@
struct wlr_renderer;
struct wlr_drm_buffer {
struct wlr_buffer base;
struct wl_resource *resource; // can be NULL if the client destroyed it
struct wlr_dmabuf_attributes dmabuf;
struct wl_listener release;
};
/**
* A stub implementation of Mesa's wl_drm protocol.
*
@ -21,6 +30,7 @@ struct wlr_renderer;
*/
struct wlr_drm {
struct wl_global *global;
struct wlr_renderer *renderer;
char *node_name;
struct {
@ -28,8 +38,14 @@ struct wlr_drm {
} events;
struct wl_listener display_destroy;
struct wl_listener renderer_destroy;
};
bool wlr_drm_buffer_is_resource(struct wl_resource *resource);
struct wlr_drm_buffer *wlr_drm_buffer_from_resource(
struct wl_resource *resource);
struct wlr_drm *wlr_drm_create(struct wl_display *display,
struct wlr_renderer *renderer);

129
types/wlr_drm.c
View File

@ -1,9 +1,12 @@
#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <drm_fourcc.h>
#include <stdlib.h>
#include <unistd.h>
#include <xf86drm.h>
#include <wlr/render/drm_format_set.h>
#include <wlr/render/wlr_renderer.h>
#include <wlr/types/wlr_buffer.h>
#include <wlr/types/wlr_drm.h>
#include <wlr/util/log.h>
#include "drm-protocol.h"
@ -11,6 +14,69 @@
#define WLR_DRM_VERSION 2
static void buffer_handle_destroy(struct wl_client *client,
struct wl_resource *resource) {
wl_resource_destroy(resource);
}
static const struct wl_buffer_interface wl_buffer_impl = {
.destroy = buffer_handle_destroy,
};
static const struct wlr_buffer_impl buffer_impl;
static struct wlr_drm_buffer *drm_buffer_from_buffer(
struct wlr_buffer *buffer) {
assert(buffer->impl == &buffer_impl);
return (struct wlr_drm_buffer *)buffer;
}
static void buffer_destroy(struct wlr_buffer *wlr_buffer) {
struct wlr_drm_buffer *buffer = drm_buffer_from_buffer(wlr_buffer);
if (buffer->resource != NULL) {
wl_resource_set_user_data(buffer->resource, NULL);
}
wlr_dmabuf_attributes_finish(&buffer->dmabuf);
wl_list_remove(&buffer->release.link);
free(buffer);
}
static bool buffer_get_dmabuf(struct wlr_buffer *wlr_buffer,
struct wlr_dmabuf_attributes *dmabuf) {
struct wlr_drm_buffer *buffer = drm_buffer_from_buffer(wlr_buffer);
*dmabuf = buffer->dmabuf;
return true;
}
static const struct wlr_buffer_impl buffer_impl = {
.destroy = buffer_destroy,
.get_dmabuf = buffer_get_dmabuf,
};
bool wlr_drm_buffer_is_resource(struct wl_resource *resource) {
return wl_resource_instance_of(resource, &wl_buffer_interface,
&wl_buffer_impl);
}
struct wlr_drm_buffer *wlr_drm_buffer_from_resource(
struct wl_resource *resource) {
assert(wlr_drm_buffer_is_resource(resource));
return wl_resource_get_user_data(resource);
}
static void buffer_handle_resource_destroy(struct wl_resource *resource) {
struct wlr_drm_buffer *buffer = wlr_drm_buffer_from_resource(resource);
buffer->resource = NULL;
wlr_buffer_drop(&buffer->base);
}
static void buffer_handle_release(struct wl_listener *listener, void *data) {
struct wlr_drm_buffer *buffer = wl_container_of(listener, buffer, release);
if (buffer->resource != NULL) {
wl_buffer_send_release(buffer->resource);
}
}
static void drm_handle_authenticate(struct wl_client *client,
struct wl_resource *resource, uint32_t id) {
// We only use render nodes, which don't need authentication
@ -36,9 +102,39 @@ static void drm_handle_create_prime_buffer(struct wl_client *client,
struct wl_resource *resource, uint32_t id, int fd, int32_t width,
int32_t height, uint32_t format, int32_t offset0, int32_t stride0,
int32_t offset1, int32_t stride1, int32_t offset2, int32_t stride2) {
struct wlr_dmabuf_attributes dmabuf = {
.width = width,
.height = height,
.format = format,
.modifier = DRM_FORMAT_MOD_INVALID,
.n_planes = 1,
.offset[0] = offset0,
.stride[0] = stride0,
.fd[0] = fd,
};
struct wlr_drm_buffer *buffer = calloc(1, sizeof(*buffer));
if (buffer == NULL) {
close(fd);
wl_resource_post_error(resource, WL_DRM_ERROR_INVALID_NAME,
"DMA-BUF imports via wl_drm are not supported, use linux-dmabuf instead");
wl_resource_post_no_memory(resource);
return;
}
wlr_buffer_init(&buffer->base, &buffer_impl, width, height);
buffer->resource = wl_resource_create(client, &wl_buffer_interface, 1, id);
if (buffer->resource == NULL) {
free(buffer);
close(fd);
wl_resource_post_no_memory(resource);
return;
}
wl_resource_set_implementation(buffer->resource, &wl_buffer_impl, buffer,
buffer_handle_resource_destroy);
buffer->dmabuf = dmabuf;
buffer->release.notify = buffer_handle_release;
wl_signal_add(&buffer->base.events.release, &buffer->release);
}
static const struct wl_drm_interface drm_impl = {
@ -62,20 +158,39 @@ static void drm_bind(struct wl_client *client, void *data,
wl_drm_send_device(resource, drm->node_name);
wl_drm_send_capabilities(resource, WL_DRM_CAPABILITY_PRIME);
const struct wlr_drm_format_set *formats =
wlr_renderer_get_dmabuf_texture_formats(drm->renderer);
if (formats == NULL) {
return;
}
for (size_t i = 0; i < formats->len; i++) {
wl_drm_send_format(resource, formats->formats[i]->format);
}
}
static void handle_display_destroy(struct wl_listener *listener, void *data) {
struct wlr_drm *drm = wl_container_of(listener, drm, display_destroy);
static void drm_destroy(struct wlr_drm *drm) {
wlr_signal_emit_safe(&drm->events.destroy, NULL);
wl_list_remove(&drm->display_destroy.link);
wl_list_remove(&drm->renderer_destroy.link);
free(drm->node_name);
wl_global_destroy(drm->global);
free(drm);
}
static void handle_display_destroy(struct wl_listener *listener, void *data) {
struct wlr_drm *drm = wl_container_of(listener, drm, display_destroy);
drm_destroy(drm);
}
static void handle_renderer_destroy(struct wl_listener *listener, void *data) {
struct wlr_drm *drm = wl_container_of(listener, drm, renderer_destroy);
drm_destroy(drm);
}
struct wlr_drm *wlr_drm_create(struct wl_display *display,
struct wlr_renderer *renderer) {
int drm_fd = wlr_renderer_get_drm_fd(renderer);
@ -111,6 +226,7 @@ struct wlr_drm *wlr_drm_create(struct wl_display *display,
}
drm->node_name = node_name;
drm->renderer = renderer;
wl_signal_init(&drm->events.destroy);
drm->global = wl_global_create(display, &wl_drm_interface, WLR_DRM_VERSION,
@ -124,5 +240,8 @@ struct wlr_drm *wlr_drm_create(struct wl_display *display,
drm->display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &drm->display_destroy);
drm->renderer_destroy.notify = handle_renderer_destroy;
wl_signal_add(&renderer->events.destroy, &drm->renderer_destroy);
return drm;
}