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render: introduce WLR_RENDER_DRM_DEVICE 

This env var allows to override the DRM node used by the GLES2 and
Vulkan renderers. It's especially useful to select a DRM node when
running with the headless backend.

References: https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/2656
This commit is contained in:
Simon Ser 2021-11-24 10:52:39 +01:00 committed by Simon Zeni
parent f29abe4c77
commit 2e33139ef7
2 changed files with 28 additions and 3 deletions
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2
docs/env_vars.md
View File

@ -10,6 +10,8 @@ wlroots reads these environment variables
of following shell search semantics for "Xwayland")
* *WLR_RENDERER*: forces the creation of a specified renderer (available
renderers: gles2, pixman, vulkan)
* *WLR_RENDER_DRM_DEVICE*: specifies the DRM node to use for
hardware-accelerated renderers.
## DRM backend

29
render/wlr_renderer.c
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@ -348,18 +348,41 @@ out:
}
struct wlr_renderer *wlr_renderer_autocreate(struct wlr_backend *backend) {
// Note, drm_fd may be negative if unavailable
int drm_fd = wlr_backend_get_drm_fd(backend);
int drm_fd = -1;
int render_drm_fd = -1;
// Allow the user to override the render node
const char *render_name = getenv("WLR_RENDER_DRM_DEVICE");
if (render_name != NULL) {
wlr_log(WLR_INFO,
"Opening DRM render node '%s' from WLR_RENDER_DRM_DEVICE",
render_name);
render_drm_fd = open(render_name, O_RDWR | O_CLOEXEC);
if (render_drm_fd < 0) {
wlr_log_errno(WLR_ERROR, "Failed to open '%s'", render_name);
return NULL;
}
if (drmGetNodeTypeFromFd(render_drm_fd) != DRM_NODE_RENDER) {
wlr_log(WLR_ERROR, "'%s' is not a DRM render node", render_name);
close(render_drm_fd);
return NULL;
}
drm_fd = render_drm_fd;
}
if (drm_fd < 0) {
drm_fd = wlr_backend_get_drm_fd(backend);
}
// If the backend hasn't picked a DRM FD, but accepts DMA-BUFs, pick an
// arbitrary render node
int render_drm_fd = -1;
uint32_t backend_caps = backend_get_buffer_caps(backend);
if (drm_fd < 0 && (backend_caps & WLR_BUFFER_CAP_DMABUF) != 0) {
render_drm_fd = open_drm_render_node();
drm_fd = render_drm_fd;
}
// Note, drm_fd may be negative if unavailable
struct wlr_renderer *renderer = renderer_autocreate_with_drm_fd(drm_fd);
if (render_drm_fd >= 0) {