Source
/*
* Copyright © 2008 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Eric Anholt <eric@anholt.net>
*
*/
int do_read(int fd, int handle, void *buf, int offset, int size)
{
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)
{
struct drm_i915_gem_pwrite write;
memset(&write, 0, sizeof(write));