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display/drm: Try to automatically find the DRI device

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This commit is contained in:
Martin Piatka
2024-04-22 15:19:23 +02:00
parent f84a67d3c5
commit fe73cb9145
1 changed files with 52 additions and 12 deletions
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64
src/video_display/drm.cpp
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@@ -54,12 +54,19 @@ namespace{
Fd_uniq() = default;
Fd_uniq(int fd) : fd(fd) { }
Fd_uniq(const Fd_uniq&) = delete;
Fd_uniq(Fd_uniq&& o){
std::swap(fd, o.fd);
}
~Fd_uniq(){
destruct();
}
Fd_uniq& operator=(const Fd_uniq&) = delete;
Fd_uniq& operator=(Fd_uniq&& o){
std::swap(fd, o.fd);
return *this;
}
int get() { return fd; }
void reset(int fd){
@@ -302,19 +309,10 @@ struct drm_display_state {
std::vector<frame_uniq> free_frames;
};
static bool init_drm_state(drm_display_state *s){
s->drm.dri_fd.reset(open("/dev/dri/card1", O_RDWR));
int dri = s->drm.dri_fd.get();
if(dri < 0){
log_msg(LOG_LEVEL_ERROR, "Failed to open DRI device\n");
return false;
}
drmVersionPtr version = drmGetVersion(dri);
static void print_drm_driver_info(drm_display_state *s){
drmVersionPtr version = drmGetVersion(s->drm.dri_fd.get());
if(version){
log_msg(LOG_LEVEL_INFO, "DRM version: %d.%d.%d (%s), Driver: %s\n",
log_msg(LOG_LEVEL_INFO, MOD_NAME "DRM version: %d.%d.%d (%s), Driver: %s\n",
version->version_major,
version->version_minor,
version->version_patchlevel,
@@ -322,6 +320,48 @@ static bool init_drm_state(drm_display_state *s){
version->name);
drmFreeVersion(version);
}
}
static Fd_uniq open_dri(drm_display_state *s){
char buf[256] = {};
const int max_index = 32;
for(int i = 0; i < max_index; i++){
snprintf(buf, sizeof(buf), DRM_DEV_NAME, DRM_DIR_NAME, i);
int fd = open(buf, O_RDWR);
if(fd < 0){
if(errno == ENOENT)
continue;
log_msg(LOG_LEVEL_INFO, MOD_NAME "Failed to open %s (%s)\n", buf, strerror(errno));
continue;
}
uint64_t dumb_support = false;
int res = 0;
res = drmGetCap(fd, DRM_CAP_DUMB_BUFFER, &dumb_support);
if(res < 0 || !dumb_support){
close(fd);
log_msg(LOG_LEVEL_WARNING, MOD_NAME "%s does not support dumb buffers\n", buf);
continue;
}
log_msg(LOG_LEVEL_INFO, MOD_NAME "Opened %s DRI device\n", buf);
return Fd_uniq(fd);
}
log_msg(LOG_LEVEL_ERROR, MOD_NAME "No suitable DRI device found\n");
return {};
}
static bool init_drm_state(drm_display_state *s){
s->drm.dri_fd = open_dri(s);
int dri = s->drm.dri_fd.get();
if(dri < 0){
return false;
}
print_drm_driver_info(s);
s->drm.gem_manager = std::make_unique<Gem_handle_manager>(dri);