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/*
* Copyright © 2008-9 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>
* Chris Wilson <chris@chris-wilson.co.uk>
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <unistd.h>
#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 <sys/ioctl.h>
#include <sys/mman.h>
#include <pthread.h>
#include "drm.h"
#include "i915_drm.h"
#include "drmtest.h"
#define OBJECT_SIZE (128*1024) /* restricted to 1MiB alignment on i915 fences */
/* Before introduction of the LRU list for fences, allocation of a fence for a page
* fault would use the first inactive fence (i.e. in preference one with no outstanding
* GPU activity, or it would wait on the first to finish). Given the choice, it would simply
* reuse the fence that had just been allocated for the previous page-fault - the worst choice
* when copying between two buffers and thus constantly swapping fences.
*/
static void *
bo_create (int fd)
{
void *ptr;
int handle;
handle = gem_create(fd, OBJECT_SIZE);
gem_set_tiling(fd, handle, I915_TILING_X, 1024);
ptr = gem_mmap(fd, handle, OBJECT_SIZE, PROT_READ | PROT_WRITE);
/* XXX: mmap_gtt pulls the bo into the GTT read domain. */
gem_sync(fd, handle);
return ptr;
}
static void *
bo_copy (void *_arg)
{
int fd = *(int *)_arg;
int n;
char *a, *b;
a = bo_create (fd);
b = bo_create (fd);
for (n = 0; n < 1000; n++) {
memcpy (a, b, OBJECT_SIZE);
sched_yield ();
}
return NULL;
}
int
main(int argc, char **argv)
{
drm_i915_getparam_t gp;
pthread_t threads[32];
int n, num_fences;
int fd, ret;
fd = drm_open_any();
gp.param = I915_PARAM_NUM_FENCES_AVAIL;
gp.value = &num_fences;
ret = ioctl(fd, DRM_IOCTL_I915_GETPARAM, &gp);
assert (ret == 0);
printf ("creating %d threads\n", num_fences);
assert (num_fences < sizeof (threads) / sizeof (threads[0]));
for (n = 0; n < num_fences; n++)
pthread_create (&threads[n], NULL, bo_copy, &fd);
for (n = 0; n < num_fences; n++)
pthread_join (threads[n], NULL);
close(fd);
return 0;
}
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