Back to index

libdrm  2.4.37
Defines | Functions
gem_readwrite.c File Reference
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <fcntl.h>
#include <inttypes.h>
#include <errno.h>
#include <sys/stat.h>
#include "drm.h"
#include "i915_drm.h"

Go to the source code of this file.

Defines

#define OBJECT_SIZE   16384

Functions

int do_read (int fd, int handle, void *buf, int offset, int size)
int do_write (int fd, int handle, void *buf, int offset, int size)
int main (int argc, char **argv)

Define Documentation

#define OBJECT_SIZE   16384

Definition at line 39 of file gem_readwrite.c.


Function Documentation

int do_read ( int  fd,
int  handle,
void *  buf,
int  offset,
int  size 
)

Definition at line 41 of file gem_readwrite.c.

{
       struct drm_i915_gem_pread read;

       /* Ensure that we don't have any convenient data in buf in case
        * we fail.
        */
       memset(buf, 0xd0, size);

       memset(&read, 0, sizeof(read));
       read.handle = handle;
       read.data_ptr = (uintptr_t)buf;
       read.size = size;
       read.offset = offset;

       return ioctl(fd, DRM_IOCTL_I915_GEM_PREAD, &read);
}
int do_write ( int  fd,
int  handle,
void *  buf,
int  offset,
int  size 
)

Definition at line 59 of file gem_readwrite.c.

{
       struct drm_i915_gem_pwrite write;

       memset(&write, 0, sizeof(write));
       write.handle = handle;
       write.data_ptr = (uintptr_t)buf;
       write.size = size;
       write.offset = offset;

       return ioctl(fd, DRM_IOCTL_I915_GEM_PWRITE, &write);
}
int main ( int  argc,
char **  argv 
)

Definition at line 72 of file gem_readwrite.c.

{
       int fd;
       struct drm_i915_gem_create create;
       uint8_t expected[OBJECT_SIZE];
       uint8_t buf[OBJECT_SIZE];
       int ret;
       int handle;

       fd = drm_open_matching("8086:*", 0);
       if (fd < 0) {
              fprintf(stderr, "failed to open intel drm device, skipping\n");
              return 0;
       }

       memset(&create, 0, sizeof(create));
       create.size = OBJECT_SIZE;
       ret = ioctl(fd, DRM_IOCTL_I915_GEM_CREATE, &create);
       assert(ret == 0);
       handle = create.handle;

       printf("Testing contents of newly created object.\n");
       ret = do_read(fd, handle, buf, 0, OBJECT_SIZE);
       assert(ret == 0);
       memset(&expected, 0, sizeof(expected));
       assert(memcmp(expected, buf, sizeof(expected)) == 0);

       printf("Testing read beyond end of buffer.\n");
       ret = do_read(fd, handle, buf, OBJECT_SIZE / 2, OBJECT_SIZE);
       printf("%d %d\n", ret, errno);
       assert(ret == -1 && errno == EINVAL);

       printf("Testing full write of buffer\n");
       memset(buf, 0, sizeof(buf));
       memset(buf + 1024, 0x01, 1024);
       memset(expected + 1024, 0x01, 1024);
       ret = do_write(fd, handle, buf, 0, OBJECT_SIZE);
       assert(ret == 0);
       ret = do_read(fd, handle, buf, 0, OBJECT_SIZE);
       assert(ret == 0);
       assert(memcmp(buf, expected, sizeof(buf)) == 0);

       printf("Testing partial write of buffer\n");
       memset(buf + 4096, 0x02, 1024);
       memset(expected + 4096, 0x02, 1024);
       ret = do_write(fd, handle, buf + 4096, 4096, 1024);
       assert(ret == 0);
       ret = do_read(fd, handle, buf, 0, OBJECT_SIZE);
       assert(ret == 0);
       assert(memcmp(buf, expected, sizeof(buf)) == 0);

       printf("Testing partial read of buffer\n");
       ret = do_read(fd, handle, buf, 512, 1024);
       assert(ret == 0);
       assert(memcmp(buf, expected + 512, 1024) == 0);

       printf("Testing read of bad buffer handle\n");
       ret = do_read(fd, 1234, buf, 0, 1024);
       assert(ret == -1 && errno == ENOENT);

       printf("Testing write of bad buffer handle\n");
       ret = do_write(fd, 1234, buf, 0, 1024);
       assert(ret == -1 && errno == ENOENT);

       close(fd);

       return 0;
}

Here is the call graph for this function: