| /* |
| * 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; |
| } |