mirror of
https://gitlab.freedesktop.org/emersion/libliftoff.git
synced 2024-12-25 21:59:11 +01:00
f6b4cd6197
From the kernel docs: > -EINTR, -EAGAIN or -ERESTARTSYS, if the IOCTL should be restarted. This can > either be due to a pending signal, or because the driver needs to completely > bail out to recover from an exceptional situation like a GPU hang. From a > userspace point of view all errors are treated equally. We're not handling ERESTARTSYS because it's non-POSIX.
106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "log.h"
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#include "private.h"
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struct liftoff_device *liftoff_device_create(int drm_fd)
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{
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struct liftoff_device *device;
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drmModeRes *drm_res;
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drmModePlaneRes *drm_plane_res;
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uint32_t i;
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device = calloc(1, sizeof(*device));
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if (device == NULL) {
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liftoff_log_errno(LIFTOFF_ERROR, "calloc");
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return NULL;
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}
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liftoff_list_init(&device->planes);
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liftoff_list_init(&device->outputs);
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device->drm_fd = dup(drm_fd);
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if (device->drm_fd < 0) {
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liftoff_log_errno(LIFTOFF_ERROR, "dup");
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liftoff_device_destroy(device);
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return NULL;
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}
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drm_res = drmModeGetResources(drm_fd);
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if (drm_res == NULL) {
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liftoff_log_errno(LIFTOFF_ERROR, "drmModeGetResources");
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liftoff_device_destroy(device);
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return NULL;
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}
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device->crtcs = malloc(drm_res->count_crtcs * sizeof(uint32_t));
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if (device->crtcs == NULL) {
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liftoff_log_errno(LIFTOFF_ERROR, "malloc");
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drmModeFreeResources(drm_res);
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liftoff_device_destroy(device);
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return NULL;
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}
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device->crtcs_len = drm_res->count_crtcs;
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memcpy(device->crtcs, drm_res->crtcs,
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drm_res->count_crtcs * sizeof(uint32_t));
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drmModeFreeResources(drm_res);
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/* TODO: allow users to choose which layers to hand over */
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drm_plane_res = drmModeGetPlaneResources(drm_fd);
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if (drm_plane_res == NULL) {
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liftoff_log_errno(LIFTOFF_ERROR, "drmModeGetPlaneResources");
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liftoff_device_destroy(device);
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return NULL;
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}
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for (i = 0; i < drm_plane_res->count_planes; i++) {
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if (plane_create(device, drm_plane_res->planes[i]) == NULL) {
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liftoff_device_destroy(device);
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return NULL;
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}
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}
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drmModeFreePlaneResources(drm_plane_res);
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return device;
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}
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void liftoff_device_destroy(struct liftoff_device *device)
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{
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struct liftoff_plane *plane, *tmp;
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if (device == NULL) {
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return;
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}
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close(device->drm_fd);
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liftoff_list_for_each_safe(plane, tmp, &device->planes, link) {
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plane_destroy(plane);
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}
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free(device->crtcs);
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free(device);
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}
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bool device_test_commit(struct liftoff_device *device,
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drmModeAtomicReq *req, bool *compatible)
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{
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int ret;
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do {
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ret = drmModeAtomicCommit(device->drm_fd, req,
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DRM_MODE_ATOMIC_TEST_ONLY, NULL);
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} while (-ret == EINTR || -ret == EAGAIN);
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if (ret == 0) {
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*compatible = true;
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} else if (-ret == EINVAL || -ret == ERANGE) {
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*compatible = false;
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} else {
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liftoff_log_errno(LIFTOFF_ERROR, "drmModeAtomicCommit");
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*compatible = false;
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return false;
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}
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return true;
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}
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