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minigbm: add minigbm_create_default_device helper

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Variants of minigbm_create_default_device are open-coded in multiple
places.  This should be used wherever minigbm can be assumed.

BUG=none
TEST=manual check that the function works

Change-Id: I3ad9897355ab72080fdca329674df09087b9adfd
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/4163418
Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org>
Tested-by: Chia-I Wu <olv@google.com>
Commit-Queue: Chia-I Wu <olv@google.com>
This commit is contained in:
Chia-I Wu 2023-01-12 10:58:58 -08:00 • committed by Chromeos LUCI
parent afa4dedecd
commit 52fca9c2cd
3 changed files with 69 additions and 1 deletions
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58
minigbm_helpers.c
View file

@ -17,6 +17,7 @@
#include <xf86drm.h>
#include <xf86drmMode.h>
#include "gbm.h"
#include "minigbm_helpers.h"
#include "util.h"
@ -312,3 +313,60 @@ PUBLIC int gbm_detect_device_info_path(unsigned int detect_flags, const char *de
close(fd);
return ret;
}
static struct gbm_device *
try_drm_devices(drmDevicePtr *devs, int dev_count, int type, int *out_fd)
{
int i;
for (i = 0; i < dev_count; i++) {
drmDevicePtr dev = devs[i];
int fd;
if (!(dev->available_nodes & (1 << type)))
continue;
fd = open(dev->nodes[type], O_RDWR | O_CLOEXEC);
if (fd >= 0) {
struct gbm_device *gbm = gbm_create_device(fd);
if (gbm) {
*out_fd = fd;
return gbm;
}
close(fd);
}
}
return NULL;
}
PUBLIC struct gbm_device *
minigbm_create_default_device(int *out_fd)
{
struct gbm_device *gbm;
drmDevicePtr devs[64];
int dev_count;
int fd;
/* try gbm_get_default_device_fd first */
fd = gbm_get_default_device_fd();
if (fd >= 0) {
gbm = gbm_create_device(fd);
if (gbm) {
*out_fd = fd;
return gbm;
}
close(fd);
}
dev_count = drmGetDevices2(0, devs, sizeof(devs) / sizeof(devs[0]));
/* try render nodes and then primary nodes */
gbm = try_drm_devices(devs, dev_count, DRM_NODE_RENDER, out_fd);
if (!gbm)
gbm = try_drm_devices(devs, dev_count, DRM_NODE_PRIMARY, out_fd);
drmFreeDevices(devs, dev_count);
return gbm;
}