weston/libweston/backend-drm/drm-gbm.c

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/*
* 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 <errno.h>
#include <stdint.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <dlfcn.h>
#include "drm-internal.h"
#include "pixman-renderer.h"
#include "pixel-formats.h"
#include "renderer-gl/gl-renderer.h"
#include "shared/weston-egl-ext.h"
#include "linux-dmabuf.h"
#include "linux-explicit-synchronization.h"
struct gl_renderer_interface *gl_renderer;
static struct gbm_device *
create_gbm_device(int fd)
{
struct gbm_device *gbm;
gl_renderer = weston_load_module("gl-renderer.so",
"gl_renderer_interface");
if (!gl_renderer)
return NULL;
/* GBM will load a dri driver, but even though they need symbols from
* libglapi, in some version of Mesa they are not linked to it. Since
* only the gl-renderer module links to it, the call above won't make
* these symbols globally available, and loading the DRI driver fails.
* Workaround this by dlopen()'ing libglapi with RTLD_GLOBAL. */
dlopen("libglapi.so.0", RTLD_LAZY | RTLD_GLOBAL);
gbm = gbm_create_device(fd);
return gbm;
}
/* When initializing EGL, if the preferred buffer format isn't available
* we may be able to substitute an ARGB format for an XRGB one.
*
* This returns 0 if substitution isn't possible, but 0 might be a
* legitimate format for other EGL platforms, so the caller is
* responsible for checking for 0 before calling gl_renderer->create().
*
* This works around https://bugs.freedesktop.org/show_bug.cgi?id=89689
* but it's entirely possible we'll see this again on other implementations.
*/
static uint32_t
fallback_format_for(uint32_t format)
{
const struct pixel_format_info *pf;
pf = pixel_format_get_info_by_opaque_substitute(format);
if (!pf)
return 0;
return pf->format;
}
static int
drm_backend_create_gl_renderer(struct drm_backend *b)
{
uint32_t format[3] = {
b->gbm_format,
fallback_format_for(b->gbm_format),
0,
};
unsigned n_formats = 2;
if (format[1])
n_formats = 3;
if (gl_renderer->display_create(b->compositor,
EGL_PLATFORM_GBM_KHR,
(void *)b->gbm,
EGL_WINDOW_BIT,
format,
n_formats) < 0) {
return -1;
}
return 0;
}
int
init_egl(struct drm_backend *b)
{
b->gbm = create_gbm_device(b->drm.fd);
if (!b->gbm)
return -1;
if (drm_backend_create_gl_renderer(b) < 0) {
gbm_device_destroy(b->gbm);
return -1;
}
return 0;
}
static void drm_output_fini_cursor_egl(struct drm_output *output)
{
unsigned int i;
for (i = 0; i < ARRAY_LENGTH(output->gbm_cursor_fb); i++) {
drm_fb_unref(output->gbm_cursor_fb[i]);
output->gbm_cursor_fb[i] = NULL;
}
}
static int
drm_output_init_cursor_egl(struct drm_output *output, struct drm_backend *b)
{
unsigned int i;
/* No point creating cursors if we don't have a plane for them. */
if (!output->cursor_plane)
return 0;
for (i = 0; i < ARRAY_LENGTH(output->gbm_cursor_fb); i++) {
struct gbm_bo *bo;
bo = gbm_bo_create(b->gbm, b->cursor_width, b->cursor_height,
GBM_FORMAT_ARGB8888,
GBM_BO_USE_CURSOR | GBM_BO_USE_WRITE);
if (!bo)
goto err;
output->gbm_cursor_fb[i] =
drm_fb_get_from_bo(bo, b, false, BUFFER_CURSOR);
if (!output->gbm_cursor_fb[i]) {
gbm_bo_destroy(bo);
goto err;
}
output->gbm_cursor_handle[i] = gbm_bo_get_handle(bo).s32;
}
return 0;
err:
weston_log("cursor buffers unavailable, using gl cursors\n");
b->cursors_are_broken = true;
drm_output_fini_cursor_egl(output);
return -1;
}
/* Init output state that depends on gl or gbm */
int
drm_output_init_egl(struct drm_output *output, struct drm_backend *b)
{
uint32_t format[2] = {
output->gbm_format,
fallback_format_for(output->gbm_format),
};
unsigned n_formats = 1;
struct weston_mode *mode = output->base.current_mode;
struct drm_plane *plane = output->scanout_plane;
unsigned int i;
assert(output->gbm_surface == NULL);
for (i = 0; i < plane->count_formats; i++) {
if (plane->formats[i].format == output->gbm_format)
break;
}
if (i == plane->count_formats) {
weston_log("format 0x%x not supported by output %s\n",
output->gbm_format, output->base.name);
return -1;
}
#ifdef HAVE_GBM_MODIFIERS
if (plane->formats[i].count_modifiers > 0) {
output->gbm_surface =
gbm_surface_create_with_modifiers(b->gbm,
mode->width,
mode->height,
output->gbm_format,
plane->formats[i].modifiers,
plane->formats[i].count_modifiers);
}
/* If allocating with modifiers fails, try again without. This can
* happen when the KMS display device supports modifiers but the
* GBM driver does not, e.g. the old i915 Mesa driver. */
if (!output->gbm_surface)
#endif
{
output->gbm_surface =
gbm_surface_create(b->gbm, mode->width, mode->height,
output->gbm_format,
output->gbm_bo_flags);
}
if (!output->gbm_surface) {
weston_log("failed to create gbm surface\n");
return -1;
}
if (format[1])
n_formats = 2;
if (gl_renderer->output_window_create(&output->base,
(EGLNativeWindowType)output->gbm_surface,
output->gbm_surface,
format,
n_formats) < 0) {
weston_log("failed to create gl renderer output state\n");
gbm_surface_destroy(output->gbm_surface);
output->gbm_surface = NULL;
return -1;
}
drm_output_init_cursor_egl(output, b);
return 0;
}
void
drm_output_fini_egl(struct drm_output *output)
{
struct drm_backend *b = to_drm_backend(output->base.compositor);
/* Destroying the GBM surface will destroy all our GBM buffers,
* regardless of refcount. Ensure we destroy them here. */
if (!b->shutting_down &&
output->scanout_plane->state_cur->fb &&
output->scanout_plane->state_cur->fb->type == BUFFER_GBM_SURFACE) {
drm_plane_state_free(output->scanout_plane->state_cur, true);
output->scanout_plane->state_cur =
drm_plane_state_alloc(NULL, output->scanout_plane);
output->scanout_plane->state_cur->complete = true;
}
gl_renderer->output_destroy(&output->base);
gbm_surface_destroy(output->gbm_surface);
output->gbm_surface = NULL;
drm_output_fini_cursor_egl(output);
}
struct drm_fb *
drm_output_render_gl(struct drm_output_state *state, pixman_region32_t *damage)
{
struct drm_output *output = state->output;
struct drm_backend *b = to_drm_backend(output->base.compositor);
struct gbm_bo *bo;
struct drm_fb *ret;
output->base.compositor->renderer->repaint_output(&output->base,
damage);
bo = gbm_surface_lock_front_buffer(output->gbm_surface);
if (!bo) {
weston_log("failed to lock front buffer: %s\n",
strerror(errno));
return NULL;
}
/* The renderer always produces an opaque image. */
ret = drm_fb_get_from_bo(bo, b, true, BUFFER_GBM_SURFACE);
if (!ret) {
weston_log("failed to get drm_fb for bo\n");
gbm_surface_release_buffer(output->gbm_surface, bo);
return NULL;
}
ret->gbm_surface = output->gbm_surface;
return ret;
}
static void
switch_to_gl_renderer(struct drm_backend *b)
{
struct drm_output *output;
bool dmabuf_support_inited;
bool linux_explicit_sync_inited;
if (!b->use_pixman)
return;
dmabuf_support_inited = !!b->compositor->renderer->import_dmabuf;
linux_explicit_sync_inited =
b->compositor->capabilities & WESTON_CAP_EXPLICIT_SYNC;
weston_log("Switching to GL renderer\n");
b->gbm = create_gbm_device(b->drm.fd);
if (!b->gbm) {
weston_log("Failed to create gbm device. "
"Aborting renderer switch\n");
return;
}
wl_list_for_each(output, &b->compositor->output_list, base.link)
pixman_renderer_output_destroy(&output->base);
b->compositor->renderer->destroy(b->compositor);
if (drm_backend_create_gl_renderer(b) < 0) {
gbm_device_destroy(b->gbm);
weston_log("Failed to create GL renderer. Quitting.\n");
/* FIXME: we need a function to shutdown cleanly */
assert(0);
}
wl_list_for_each(output, &b->compositor->output_list, base.link)
drm_output_init_egl(output, b);
b->use_pixman = 0;
if (!dmabuf_support_inited && b->compositor->renderer->import_dmabuf) {
if (linux_dmabuf_setup(b->compositor) < 0)
weston_log("Error: initializing dmabuf "
"support failed.\n");
}
if (!linux_explicit_sync_inited &&
(b->compositor->capabilities & WESTON_CAP_EXPLICIT_SYNC)) {
if (linux_explicit_synchronization_setup(b->compositor) < 0)
weston_log("Error: initializing explicit "
" synchronization support failed.\n");
}
}
void
renderer_switch_binding(struct weston_keyboard *keyboard,
const struct timespec *time, uint32_t key, void *data)
{
struct drm_backend *b =
to_drm_backend(keyboard->seat->compositor);
switch_to_gl_renderer(b);
}