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render: only open DRM render node if necessary

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Only open a render node if we actually need one (ie, if we're about
to attempt GLES2 or Vulkan).
This commit is contained in:
Simon Ser 2023-08-23 13:24:34 +02:00
parent f5917f0247
commit 11aba53ead
1 changed files with 114 additions and 90 deletions
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206
render/wlr_renderer.c
View file

@ -245,77 +245,6 @@ bool wlr_renderer_init_wl_display(struct wlr_renderer *r,
return true; return true;
} }
static void log_creation_failure(bool is_auto, const char *msg) {
wlr_log(is_auto ? WLR_DEBUG : WLR_ERROR, "%s%s", msg, is_auto ? ". Skipping!" : "");
}
struct wlr_renderer *renderer_autocreate_with_drm_fd(int drm_fd) {
const char *renderer_options[] = {
"auto",
#if WLR_HAS_GLES2_RENDERER
"gles2",
#endif
#if WLR_HAS_VULKAN_RENDERER
"vulkan",
#endif
"pixman",
NULL
};
const char *renderer_name = renderer_options[env_parse_switch("WLR_RENDERER", renderer_options)];
bool is_auto = strcmp(renderer_name, "auto") == 0;
struct wlr_renderer *renderer = NULL;
#if WLR_HAS_GLES2_RENDERER
if (is_auto || strcmp(renderer_name, "gles2") == 0) {
if (drm_fd < 0) {
log_creation_failure(is_auto, "Cannot create GLES2 renderer: no DRM FD available");
} else {
renderer = wlr_gles2_renderer_create_with_drm_fd(drm_fd);
if (renderer) {
return renderer;
} else {
log_creation_failure(is_auto, "Failed to create a GLES2 renderer");
}
}
}
#endif
#if WLR_HAS_VULKAN_RENDERER
if (strcmp(renderer_name, "vulkan") == 0) {
if (drm_fd < 0) {
log_creation_failure(is_auto, "Cannot create Vulkan renderer: no DRM FD available");
} else {
renderer = wlr_vk_renderer_create_with_drm_fd(drm_fd);
if (renderer) {
return renderer;
} else {
log_creation_failure(is_auto, "Failed to create a Vulkan renderer");
}
}
}
#endif
bool has_render_node = false;
if (is_auto && drm_fd >= 0) {
char *render_node = drmGetRenderDeviceNameFromFd(drm_fd);
has_render_node = render_node != NULL;
free(render_node);
}
if ((is_auto && !has_render_node) || strcmp(renderer_name, "pixman") == 0) {
renderer = wlr_pixman_renderer_create();
if (renderer) {
return renderer;
} else {
log_creation_failure(is_auto, "Failed to create a pixman renderer");
}
}
wlr_log(WLR_ERROR, "Could not initialize renderer");
return NULL;
}
static int open_drm_render_node(void) { static int open_drm_render_node(void) {
uint32_t flags = 0; uint32_t flags = 0;
int devices_len = drmGetDevices2(flags, NULL, 0); int devices_len = drmGetDevices2(flags, NULL, 0);
@ -362,9 +291,11 @@ out:
return fd; return fd;
} }
struct wlr_renderer *wlr_renderer_autocreate(struct wlr_backend *backend) { static bool open_preferred_drm_fd(struct wlr_backend *backend, int *drm_fd_ptr,
int drm_fd = -1; bool *own_drm_fd) {
int render_drm_fd = -1; if (*drm_fd_ptr >= 0) {
return true;
}
// Allow the user to override the render node // Allow the user to override the render node
const char *render_name = getenv("WLR_RENDER_DRM_DEVICE"); const char *render_name = getenv("WLR_RENDER_DRM_DEVICE");
@ -372,41 +303,134 @@ struct wlr_renderer *wlr_renderer_autocreate(struct wlr_backend *backend) {
wlr_log(WLR_INFO, wlr_log(WLR_INFO,
"Opening DRM render node '%s' from WLR_RENDER_DRM_DEVICE", "Opening DRM render node '%s' from WLR_RENDER_DRM_DEVICE",
render_name); render_name);
render_drm_fd = open(render_name, O_RDWR | O_CLOEXEC); int drm_fd = open(render_name, O_RDWR | O_CLOEXEC);
if (render_drm_fd < 0) { if (drm_fd < 0) {
wlr_log_errno(WLR_ERROR, "Failed to open '%s'", render_name); wlr_log_errno(WLR_ERROR, "Failed to open '%s'", render_name);
return NULL; return false;
} }
if (drmGetNodeTypeFromFd(render_drm_fd) != DRM_NODE_RENDER) { if (drmGetNodeTypeFromFd(drm_fd) != DRM_NODE_RENDER) {
wlr_log(WLR_ERROR, "'%s' is not a DRM render node", render_name); wlr_log(WLR_ERROR, "'%s' is not a DRM render node", render_name);
close(render_drm_fd); close(drm_fd);
return NULL; return false;
} }
drm_fd = render_drm_fd; *drm_fd_ptr = drm_fd;
*own_drm_fd = true;
return true;
} }
if (drm_fd < 0) { // Prefer the backend's DRM node, if any
drm_fd = wlr_backend_get_drm_fd(backend); int backend_drm_fd = wlr_backend_get_drm_fd(backend);
if (backend_drm_fd >= 0) {
*drm_fd_ptr = backend_drm_fd;
*own_drm_fd = false;
return true;
} }
// If the backend hasn't picked a DRM FD, but accepts DMA-BUFs, pick an // If the backend hasn't picked a DRM FD, but accepts DMA-BUFs, pick an
// arbitrary render node // arbitrary render node
uint32_t backend_caps = backend_get_buffer_caps(backend); uint32_t backend_caps = backend_get_buffer_caps(backend);
if (drm_fd < 0 && (backend_caps & WLR_BUFFER_CAP_DMABUF) != 0) { if (backend_caps & WLR_BUFFER_CAP_DMABUF) {
render_drm_fd = open_drm_render_node(); int drm_fd = open_drm_render_node();
drm_fd = render_drm_fd; if (drm_fd < 0) {
return false;
}
*drm_fd_ptr = drm_fd;
*own_drm_fd = true;
return true;
} }
// Note, drm_fd may be negative if unavailable return false;
struct wlr_renderer *renderer = renderer_autocreate_with_drm_fd(drm_fd);
if (render_drm_fd >= 0) {
close(render_drm_fd);
} }
static void log_creation_failure(bool is_auto, const char *msg) {
wlr_log(is_auto ? WLR_DEBUG : WLR_ERROR, "%s%s", msg, is_auto ? ". Skipping!" : "");
}
static struct wlr_renderer *renderer_autocreate(struct wlr_backend *backend, int drm_fd) {
const char *renderer_options[] = {
"auto",
#if WLR_HAS_GLES2_RENDERER
"gles2",
#endif
#if WLR_HAS_VULKAN_RENDERER
"vulkan",
#endif
"pixman",
NULL
};
const char *renderer_name = renderer_options[env_parse_switch("WLR_RENDERER", renderer_options)];
bool is_auto = strcmp(renderer_name, "auto") == 0;
struct wlr_renderer *renderer = NULL;
bool own_drm_fd = false;
(void)open_preferred_drm_fd;
#if WLR_HAS_GLES2_RENDERER
if (is_auto || strcmp(renderer_name, "gles2") == 0) {
if (!open_preferred_drm_fd(backend, &drm_fd, &own_drm_fd)) {
log_creation_failure(is_auto, "Cannot create GLES2 renderer: no DRM FD available");
} else {
renderer = wlr_gles2_renderer_create_with_drm_fd(drm_fd);
if (renderer) {
goto out;
} else {
log_creation_failure(is_auto, "Failed to create a GLES2 renderer");
}
}
}
#endif
#if WLR_HAS_VULKAN_RENDERER
if (strcmp(renderer_name, "vulkan") == 0) {
if (!open_preferred_drm_fd(backend, &drm_fd, &own_drm_fd)) {
log_creation_failure(is_auto, "Cannot create Vulkan renderer: no DRM FD available");
} else {
renderer = wlr_vk_renderer_create_with_drm_fd(drm_fd);
if (renderer) {
goto out;
} else {
log_creation_failure(is_auto, "Failed to create a Vulkan renderer");
}
}
}
#endif
bool has_render_node = false;
int backend_drm_fd = wlr_backend_get_drm_fd(backend);
if (is_auto && backend_drm_fd >= 0) {
char *render_node = drmGetRenderDeviceNameFromFd(backend_drm_fd);
has_render_node = render_node != NULL;
free(render_node);
}
if ((is_auto && !has_render_node) || strcmp(renderer_name, "pixman") == 0) {
renderer = wlr_pixman_renderer_create();
if (renderer) {
goto out;
} else {
log_creation_failure(is_auto, "Failed to create a pixman renderer");
}
}
out:
if (renderer == NULL) {
wlr_log(WLR_ERROR, "Could not initialize renderer");
}
if (own_drm_fd && drm_fd >= 0) {
close(drm_fd);
}
return renderer; return renderer;
} }
struct wlr_renderer *renderer_autocreate_with_drm_fd(int drm_fd) {
return renderer_autocreate(NULL, drm_fd);
}
struct wlr_renderer *wlr_renderer_autocreate(struct wlr_backend *backend) {
return renderer_autocreate(backend, -1);
}
int wlr_renderer_get_drm_fd(struct wlr_renderer *r) { int wlr_renderer_get_drm_fd(struct wlr_renderer *r) {
if (!r->impl->get_drm_fd) { if (!r->impl->get_drm_fd) {
return -1; return -1;