--- /dev/null
+/*
+ * Copyright © 2014 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:
+ * Chris Wilson <chris@chris-wilson.co.uk>
+ *
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+
+#include "drm.h"
+#include "i915_drm.h"
+#include "drmtest.h"
+
+#define BLT_WRITE_ALPHA (1<<21)
+#define BLT_WRITE_RGB (1<<20)
+
+static const uint32_t canary = 0xdeadbeef;
+
+static double elapsed(const struct timeval *start,
+ const struct timeval *end)
+{
+ return 1e6*(end->tv_sec - start->tv_sec) + (end->tv_usec - start->tv_usec);
+}
+
+static void busy(int fd, uint32_t handle, int size, int loops)
+{
+ struct drm_i915_gem_relocation_entry reloc[20];
+ struct drm_i915_gem_exec_object2 gem_exec[2];
+ struct drm_i915_gem_execbuffer2 execbuf;
+ struct drm_i915_gem_pwrite gem_pwrite;
+ struct drm_i915_gem_create create;
+ uint32_t buf[102], *b;
+ int i;
+
+ memset(reloc, 0, sizeof(reloc));
+ memset(gem_exec, 0, sizeof(gem_exec));
+ memset(&execbuf, 0, sizeof(execbuf));
+
+ b = buf;
+ for (i = 0; i < 20; i++) {
+ *b++ = COLOR_BLT_CMD | BLT_WRITE_ALPHA | BLT_WRITE_RGB;
+ *b++ = 0xf0 << 16 | 1 << 25 | 1 << 24 | 4096;
+ *b++ = size >> 12 << 16 | 4096;
+ reloc[i].offset = (b - buf) * sizeof(uint32_t);
+ reloc[i].target_handle = handle;
+ reloc[i].read_domains = I915_GEM_DOMAIN_RENDER;
+ reloc[i].write_domain = I915_GEM_DOMAIN_RENDER;
+ *b++ = 0;
+ *b++ = canary;
+ }
+ *b++ = MI_BATCH_BUFFER_END;
+ *b++ = 0;
+
+ gem_exec[0].handle = handle;
+ gem_exec[0].flags = EXEC_OBJECT_NEEDS_FENCE;
+
+ create.handle = 0;
+ create.size = 4096;
+ drmIoctl(fd, DRM_IOCTL_I915_GEM_CREATE, &create);
+ gem_exec[1].handle = create.handle;
+ gem_exec[1].relocation_count = 20;
+ gem_exec[1].relocs_ptr = (uintptr_t)reloc;
+
+ execbuf.buffers_ptr = (uintptr_t)gem_exec;
+ execbuf.buffer_count = 2;
+ execbuf.batch_len = sizeof(buf);
+ execbuf.flags = 1 << 11;
+ if (HAS_BLT_RING(intel_get_drm_devid(fd)))
+ execbuf.flags |= I915_EXEC_BLT;
+
+ gem_pwrite.handle = gem_exec[1].handle;
+ gem_pwrite.offset = 0;
+ gem_pwrite.size = sizeof(buf);
+ gem_pwrite.data_ptr = (uintptr_t)buf;
+ if (drmIoctl(fd, DRM_IOCTL_I915_GEM_PWRITE, &gem_pwrite) == 0) {
+ while (loops--)
+ drmIoctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf);
+ }
+
+ drmIoctl(fd, DRM_IOCTL_GEM_CLOSE, &create.handle);
+}
+
+static void run(int child)
+{
+ const int size = 4096 * (256 + child * child);
+ const int tiling = child % 2;
+ const int write = child % 2;
+ int fd = drm_open_any();
+ uint32_t handle = gem_create(fd, size);
+ uint32_t *ptr;
+ uint32_t x;
+
+ igt_assert(handle);
+
+ if (tiling != I915_TILING_NONE)
+ gem_set_tiling(fd, handle, tiling, 4096);
+
+ /* load up the unfaulted bo */
+ busy(fd, handle, size, 100);
+
+ /* Note that we ignore the API and rely on the implict
+ * set-to-gtt-domain within the fault handler.
+ */
+ if (write) {
+ ptr = gem_mmap(fd, handle, size, PROT_READ | PROT_WRITE);
+ ptr[rand() % (size / 4)] = canary;
+ } else
+ ptr = gem_mmap(fd, handle, size, PROT_READ);
+ x = ptr[rand() % (size / 4)];
+ munmap(ptr, size);
+
+ igt_assert(x == canary);
+ igt_exit();
+}
+
+int main(int argc, char **argv)
+{
+ struct timeval start, end;
+ pid_t children[64];
+ int n;
+
+ igt_simple_init();
+ igt_skip_on_simulation();
+
+ gettimeofday(&start, NULL);
+ for (n = 0; n < ARRAY_SIZE(children); n++) {
+ switch ((children[n] = fork())) {
+ case -1: igt_assert(0);
+ case 0: run(n); break;
+ default: break;
+ }
+ }
+
+ for (n = 0; n < ARRAY_SIZE(children); n++) {
+ int status = -1;
+ while (waitpid(children[n], &status, 0) == -1 &&
+ errno == -EINTR)
+ ;
+ igt_assert(status == 0);
+ }
+ gettimeofday(&end, NULL);
+ printf("Time to execute %lu children: %7.3fµs\n",
+ ARRAY_SIZE(children), elapsed(&start, &end));
+
+ return 0;
+}