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kmsdrm: find available card if called without index. 

This work was done by Michael Grzeschik, I just cleaned up the patch a little.

Fixes Bugzilla #4241.
Ryan C. Gordon 2018-10-09 00:27:55 -04:00
parent 62f806ed6c
commit 88b3252555
1 changed files with 77 additions and 6 deletions
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83
src/video/kmsdrm/SDL_kmsdrmvideo.c
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@ -41,20 +41,27 @@
#include "SDL_kmsdrmopengles.h"
#include "SDL_kmsdrmmouse.h"
#include "SDL_kmsdrmdyn.h"
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#define KMSDRM_DRI_CARD_0 "/dev/dri/card0"
#define KMSDRM_DRI_PATH "/dev/dri/"
static int
KMSDRM_Available(void)
check_modestting(int devindex)
{
int available = 0;
SDL_bool available = SDL_FALSE;
char device[512];
int drm_fd;
int drm_fd = open(KMSDRM_DRI_CARD_0, O_RDWR | O_CLOEXEC);
SDL_snprintf(device, sizeof (device), "%scard%d", KMSDRM_DRI_PATH, devindex);
drm_fd = open(device, O_RDWR | O_CLOEXEC);
if (drm_fd >= 0) {
if (SDL_KMSDRM_LoadSymbols()) {
drmModeRes *resources = KMSDRM_drmModeGetResources(drm_fd);
if (resources != NULL) {
available = 1;
available = SDL_TRUE;
KMSDRM_drmModeFreeResources(resources);
}
SDL_KMSDRM_UnloadSymbols();
@ -65,6 +72,66 @@ KMSDRM_Available(void)
return available;
}
static int get_dricount(void)
{
int devcount = 0;
struct dirent *res;
struct stat sb;
DIR *folder;
if (!(stat(KMSDRM_DRI_PATH, &sb) == 0
&& S_ISDIR(sb.st_mode))) {
printf("The path %s cannot be opened or is not available\n",
KMSDRM_DRI_PATH);
return 0;
}
if (access(KMSDRM_DRI_PATH, F_OK) == -1) {
printf("The path %s cannot be opened\n",
KMSDRM_DRI_PATH);
return 0;
}
folder = opendir(KMSDRM_DRI_PATH);
if (folder) {
while ((res = readdir(folder))) {
if (res->d_type == DT_CHR) {
devcount++;
}
}
closedir(folder);
}
return devcount;
}
static int
get_driindex(void)
{
const int devcount = get_dricount();
int i;
for (i = 0; i < devcount; i++) {
if (check_modestting(i)) {
return i;
}
}
return -ENOENT;
}
static int
KMSDRM_Available(void)
{
int ret = -ENOENT;
ret = get_driindex();
if (ret >= 0)
return 1;
return ret;
}
static void
KMSDRM_Destroy(SDL_VideoDevice * device)
{
@ -83,7 +150,11 @@ KMSDRM_Create(int devindex)
SDL_VideoDevice *device;
SDL_VideoData *vdata;
if (devindex < 0 || devindex > 99) {
if (!devindex || (devindex > 99)) {
devindex = get_driindex();
}
if (devindex < 0) {
SDL_SetError("devindex (%d) must be between 0 and 99.\n", devindex);
return NULL;
}