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compositor-drm: add specific_device configuration option

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Developers with testing rigs having multiple graphics cards plugged in
often want to test things on a specific card. We have ways to choose a
card through seat assignments, but configuring that run by run is
awkward.

Add a new DRM backend option to try to open a specific device, and quit
if it fails.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Daniel Stone <daniels@collabora.com>
This commit is contained in:
Pekka Paalanen 2017-03-28 18:04:27 +03:00
parent b0341ae972
commit b45ed8baf0
2 changed files with 35 additions and 1 deletions
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29
libweston/compositor-drm.c
View file

@ -3813,6 +3813,30 @@ find_primary_gpu(struct drm_backend *b, const char *seat)
return drm_device;
}
static struct udev_device *
open_specific_drm_device(struct drm_backend *b, const char *name)
{
struct udev_device *device;
device = udev_device_new_from_subsystem_sysname(b->udev, "drm", name);
if (!device) {
weston_log("ERROR: could not open DRM device '%s'\n", name);
return NULL;
}
if (!drm_device_is_kms(b, device)) {
udev_device_unref(device);
weston_log("ERROR: DRM device '%s' is not a KMS device.\n", name);
return NULL;
}
/* If we're returning a device to use, we must have an open FD for
* it. */
assert(b->drm.fd >= 0);
return device;
}
static void
planes_binding(struct weston_keyboard *keyboard, const struct timespec *time,
uint32_t key, void *data)
@ -4064,7 +4088,10 @@ drm_backend_create(struct weston_compositor *compositor,
b->session_listener.notify = session_notify;
wl_signal_add(&compositor->session_signal, &b->session_listener);
drm_device = find_primary_gpu(b, seat_id);
if (config->specific_device)
drm_device = open_specific_drm_device(b, config->specific_device);
else
drm_device = find_primary_gpu(b, seat_id);
if (drm_device == NULL) {
weston_log("no drm device found\n");
goto err_udev;

7
libweston/compositor-drm.h
View file

@ -139,6 +139,13 @@ struct weston_drm_backend_config {
*
* It is exprimed in milliseconds, 0 means disabled. */
uint32_t pageflip_timeout;
/** Specific DRM device to open
*
* A DRM device name, like "card0", to open. If NULL, use heuristics
* based on seat names and boot_vga to find the right device.
*/
char *specific_device;
};
#ifdef __cplusplus