Chris Wilson | 8f3f862 | 2009-09-01 10:09:55 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright © 2008-9 Intel Corporation |
| 3 | * |
| 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 5 | * copy of this software and associated documentation files (the "Software"), |
| 6 | * to deal in the Software without restriction, including without limitation |
| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 8 | * and/or sell copies of the Software, and to permit persons to whom the |
| 9 | * Software is furnished to do so, subject to the following conditions: |
| 10 | * |
| 11 | * The above copyright notice and this permission notice (including the next |
| 12 | * paragraph) shall be included in all copies or substantial portions of the |
| 13 | * Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| 21 | * IN THE SOFTWARE. |
| 22 | * |
| 23 | * Authors: |
| 24 | * Eric Anholt <eric@anholt.net> |
| 25 | * Chris Wilson <chris@chris-wilson.co.uk> |
| 26 | * |
| 27 | */ |
| 28 | |
| 29 | #define _GNU_SOURCE |
| 30 | |
| 31 | #include <unistd.h> |
| 32 | #include <stdlib.h> |
| 33 | #include <stdio.h> |
| 34 | #include <string.h> |
| 35 | #include <assert.h> |
| 36 | #include <fcntl.h> |
| 37 | #include <inttypes.h> |
| 38 | #include <errno.h> |
| 39 | #include <sys/stat.h> |
| 40 | #include <sys/ioctl.h> |
| 41 | #include <sys/mman.h> |
| 42 | #include <pthread.h> |
| 43 | #include "drm.h" |
| 44 | #include "i915_drm.h" |
| 45 | #include "drmtest.h" |
| 46 | |
Daniel Vetter | 2e9e27c | 2011-10-15 13:46:19 +0200 | [diff] [blame] | 47 | #define OBJECT_SIZE (128*1024) /* restricted to 1MiB alignment on i915 fences */ |
Chris Wilson | 8f3f862 | 2009-09-01 10:09:55 +0100 | [diff] [blame] | 48 | |
| 49 | /* Before introduction of the LRU list for fences, allocation of a fence for a page |
| 50 | * fault would use the first inactive fence (i.e. in preference one with no outstanding |
| 51 | * GPU activity, or it would wait on the first to finish). Given the choice, it would simply |
| 52 | * reuse the fence that had just been allocated for the previous page-fault - the worst choice |
| 53 | * when copying between two buffers and thus constantly swapping fences. |
| 54 | */ |
| 55 | |
| 56 | static void * |
| 57 | bo_create (int fd) |
| 58 | { |
| 59 | struct drm_i915_gem_create create; |
| 60 | struct drm_i915_gem_set_tiling tiling; |
| 61 | struct drm_i915_gem_set_domain domain; |
| 62 | struct drm_i915_gem_mmap_gtt mmap_arg; |
| 63 | void *ptr; |
| 64 | int handle; |
| 65 | int ret; |
| 66 | |
| 67 | memset(&create, 0, sizeof(create)); |
| 68 | create.size = OBJECT_SIZE; |
| 69 | ret = ioctl(fd, DRM_IOCTL_I915_GEM_CREATE, &create); |
| 70 | assert(ret == 0); |
| 71 | handle = create.handle; |
| 72 | |
| 73 | memset(&tiling, 0, sizeof(tiling)); |
| 74 | tiling.handle = handle; |
| 75 | tiling.tiling_mode = I915_TILING_X; |
| 76 | tiling.stride = 1024; |
| 77 | ret = ioctl(fd, DRM_IOCTL_I915_GEM_SET_TILING, &tiling); |
| 78 | assert(ret == 0); |
| 79 | |
| 80 | memset(&mmap_arg, 0, sizeof(mmap_arg)); |
| 81 | mmap_arg.handle = handle; |
| 82 | |
| 83 | /* Get the fake offset back... */ |
| 84 | ret = ioctl(fd, DRM_IOCTL_I915_GEM_MMAP_GTT, &mmap_arg); |
| 85 | assert (ret == 0); |
| 86 | ptr = mmap64(0, OBJECT_SIZE, PROT_READ | PROT_WRITE, |
| 87 | MAP_SHARED, fd, mmap_arg.offset); |
| 88 | assert (ptr != MAP_FAILED); |
| 89 | |
| 90 | /* XXX: mmap_gtt pulls the bo into the GTT read domain. */ |
| 91 | memset(&domain, 0, sizeof(domain)); |
| 92 | domain.handle = handle; |
| 93 | domain.read_domains = I915_GEM_DOMAIN_GTT; |
| 94 | domain.write_domain = I915_GEM_DOMAIN_GTT; |
| 95 | ret = ioctl(fd, DRM_IOCTL_I915_GEM_SET_DOMAIN, &domain); |
| 96 | assert (ret == 0); |
| 97 | |
| 98 | return ptr; |
| 99 | } |
| 100 | |
| 101 | static void * |
| 102 | bo_copy (void *_arg) |
| 103 | { |
| 104 | int fd = *(int *)_arg; |
Daniel Vetter | 2e9e27c | 2011-10-15 13:46:19 +0200 | [diff] [blame] | 105 | int n; |
Chris Wilson | 8f3f862 | 2009-09-01 10:09:55 +0100 | [diff] [blame] | 106 | char *a, *b; |
| 107 | |
| 108 | a = bo_create (fd); |
| 109 | b = bo_create (fd); |
| 110 | |
Daniel Vetter | 2e9e27c | 2011-10-15 13:46:19 +0200 | [diff] [blame] | 111 | for (n = 0; n < 1000; n++) { |
| 112 | memcpy (a, b, OBJECT_SIZE); |
Alan Coopersmith | 0075159 | 2012-01-06 15:45:28 -0800 | [diff] [blame^] | 113 | sched_yield (); |
Chris Wilson | 8f3f862 | 2009-09-01 10:09:55 +0100 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | return NULL; |
| 117 | } |
| 118 | |
| 119 | int |
| 120 | main(int argc, char **argv) |
| 121 | { |
| 122 | drm_i915_getparam_t gp; |
| 123 | pthread_t threads[32]; |
| 124 | int n, num_fences; |
| 125 | int fd, ret; |
| 126 | |
| 127 | fd = drm_open_any(); |
| 128 | |
| 129 | gp.param = I915_PARAM_NUM_FENCES_AVAIL; |
| 130 | gp.value = &num_fences; |
| 131 | ret = ioctl(fd, DRM_IOCTL_I915_GETPARAM, &gp); |
| 132 | assert (ret == 0); |
| 133 | |
| 134 | printf ("creating %d threads\n", num_fences); |
| 135 | assert (num_fences < sizeof (threads) / sizeof (threads[0])); |
| 136 | |
| 137 | for (n = 0; n < num_fences; n++) |
| 138 | pthread_create (&threads[n], NULL, bo_copy, &fd); |
| 139 | |
| 140 | for (n = 0; n < num_fences; n++) |
| 141 | pthread_join (threads[n], NULL); |
| 142 | |
| 143 | close(fd); |
| 144 | |
| 145 | return 0; |
| 146 | } |