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backend/session: use drmIsKMS

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This moves the magic incantation into libdrm and is clearer. See
[1] for details.

While at it, fixup the doc comment and improve logging.

[1]: 523b3658aa
This commit is contained in:
Simon Ser 2021-06-15 09:54:29 +02:00 committed by Kenny Levinsen
parent 6c3d080e25
commit fb933d3204
2 changed files with 7 additions and 20 deletions
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25
backend/session/session.c
View file

@ -337,9 +337,8 @@ bool wlr_session_change_vt(struct wlr_session *session, unsigned vt) {
return libseat_switch_session(session->seat_handle, vt) == 0;
}
/* Tests if 'path' is KMS compatible by trying to open it.
* It leaves the open device in *fd_out it it succeeds.
*/
/* Tests if 'path' is KMS compatible by trying to open it. Returns the opened
* device on success. */
static struct wlr_device *open_if_kms(struct wlr_session *restrict session,
const char *restrict path) {
if (!path) {
@ -351,25 +350,13 @@ static struct wlr_device *open_if_kms(struct wlr_session *restrict session,
return NULL;
}
// The kernel errors out with EOPNOTSUPP if DRIVER_MODESET isn't set
drmModeRes *res = drmModeGetResources(dev->fd);
if (!res) {
if (errno != EOPNOTSUPP) {
wlr_log_errno(WLR_ERROR, "drmModeGetResources(%s) failed", path);
}
goto out_dev;
if (!drmIsKMS(dev->fd)) {
wlr_log(WLR_DEBUG, "Ignoring '%s': not a KMS device", path);
wlr_session_close_file(session, dev);
return NULL;
}
if (res->count_crtcs == 0) {
drmModeFreeResources(res);
goto out_dev;
}
drmModeFreeResources(res);
return dev;
out_dev:
wlr_session_close_file(session, dev);
return NULL;
}
static ssize_t explicit_find_gpus(struct wlr_session *session,

2
meson.build
View file

@ -96,7 +96,7 @@ internal_features = {
wayland_server = dependency('wayland-server', version: '>=1.19')
wayland_client = dependency('wayland-client')
drm = dependency('libdrm', version: '>=2.4.95')
drm = dependency('libdrm', version: '>=2.4.105')
gbm = dependency('gbm', version: '>=17.1.0')
libinput = dependency('libinput', version: '>=1.14.0')
xkbcommon = dependency('xkbcommon')