diff options
| author | Simon Ser <contact@emersion.fr> | 2021-09-02 10:52:43 +0200 |
|---|---|---|
| committer | Simon Ser <contact@emersion.fr> | 2021-10-14 21:23:41 +0200 |
| commit | 1b65a80e9d87a5107fadcced397ed231703d039e (patch) | |
| tree | df303aefb04f4c77c8fc149eea911090847f402b /render/allocator/allocator.c | |
| parent | 4fae8f7be39f9a1dab2657858c2f347320ab3149 (diff) | |
render/allocator: use empty DRM lease to re-open node
This allows us to obtain a new DRM file description without relying
on filesystem permissions.
Diffstat (limited to 'render/allocator/allocator.c')
| -rw-r--r-- | render/allocator/allocator.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/render/allocator/allocator.c b/render/allocator/allocator.c index daf1f716..0244e07a 100644 --- a/render/allocator/allocator.c +++ b/render/allocator/allocator.c @@ -5,6 +5,7 @@ #include <unistd.h> #include <wlr/util/log.h> #include <xf86drm.h> +#include <xf86drmMode.h> #include "backend/backend.h" #include "render/allocator/allocator.h" #include "render/allocator/drm_dumb.h" @@ -22,10 +23,22 @@ void wlr_allocator_init(struct wlr_allocator *alloc, /* Re-open the DRM node to avoid GEM handle ref'counting issues. See: * https://gitlab.freedesktop.org/mesa/drm/-/merge_requests/110 - * TODO: don't assume we have the permission to just open the DRM node, - * find another way to re-open it. */ static int reopen_drm_node(int drm_fd, bool allow_render_node) { + if (drmIsMaster(drm_fd)) { + // Only recent kernels support empty leases + uint32_t lessee_id; + int lease_fd = drmModeCreateLease(drm_fd, NULL, 0, 0, &lessee_id); + if (lease_fd >= 0) { + return lease_fd; + } else if (lease_fd != -EINVAL && lease_fd != -EOPNOTSUPP) { + wlr_log_errno(WLR_ERROR, "drmModeCreateLease failed"); + return -1; + } + wlr_log(WLR_DEBUG, "drmModeCreateLease failed, " + "falling back to plain open"); + } + char *name = NULL; if (allow_render_node) { name = drmGetRenderDeviceNameFromFd(drm_fd); |