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#include <assert.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include "drm.h"
#include "vgem_drm.h"
#include "libvgem.h"
int
drm_open_vgem(void)
{
char *name;
int i, fd;
for (i = 0; i < 16; i++) {
struct stat _stat;
int ret;
ret = asprintf(&name, "/sys/bus/platform/devices/vgem/drm/card%d", i);
assert(ret != -1);
if (stat(name, &_stat) == -1) {
free(name);
continue;
}
free(name);
ret = asprintf(&name, "/dev/dri/card%d", i);
assert(ret != -1);
fd = open(name, O_RDWR);
free(name);
if (fd == -1) {
perror("Couldn't open drm device read/write\n");
return -1;
}
return fd;
}
fprintf(stderr, "failed to open any drm device. retry as root?\n");
abort();
}
int
create_vgem_bo(int fd, size_t size)
{
struct drm_mode_create_dumb create;
int ret;
if (size == 0)
size = 4096;
memset(&create, 0, sizeof(create));
create.height = size;
create.width = 1;
create.bpp = 1;
ret = drmIoctl(fd, DRM_IOCTL_MODE_CREATE_DUMB, &create);
if (ret) {
fprintf(stderr, "DRM_IOCTL_MODE_CREATE_DUMB, failed with "
"%d\n", ret);
abort();
}
assert(create.size == size);
return create.handle;
}
void *
mmap_vgem_bo(int fd, int handle, size_t size)
{
struct drm_mode_map_dumb mmap_arg;
void *ptr;
int ret;
memset(&mmap_arg, 0, sizeof(mmap_arg));
mmap_arg.handle = handle;
ret = drmIoctl(fd, DRM_IOCTL_MODE_MAP_DUMB, &mmap_arg);
assert(ret == 0);
assert(mmap_arg.offset != 0);
ptr = mmap(NULL, size, (PROT_READ|PROT_WRITE), MAP_PRIVATE, fd,
mmap_arg.offset);
assert(ptr != MAP_FAILED);
return ptr;
}
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