tests: add gem_cs_prefetch

Tested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

tests/Makefile.am

@@ -33,6 +33,7 @@ TESTS_progs = \
 	gem_fence_thrash \
 	gem_fenced_exec_thrash \
 	gem_gtt_speed \
+	gem_cs_prefetch \
 	gen3_render_linear_blits \
 	gen3_render_tiledx_blits \
 	gen3_render_tiledy_blits \

tests/gem_cs_prefetch.c

@@ -0,0 +1,167 @@
+/*
+ * Copyright © 2011 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:
+ *    Daniel Vetter <daniel.vetter@ffwll.ch>
+ *
+ */
+
+/*
+ * Testcase: Test the CS prefetch behaviour on batches
+ *
+ * Historically the batch prefetcher doesn't check whether it's crossing page
+ * boundaries and likes to throw up when it gets a pagefault in return for his
+ * over-eager behaviour. Check for this.
+ */
+#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/time.h>
+#include "drm.h"
+#include "i915_drm.h"
+#include "drmtest.h"
+#include "intel_bufmgr.h"
+#include "intel_batchbuffer.h"
+#include "intel_gpu_tools.h"
+
+static drm_intel_bufmgr *bufmgr;
+struct intel_batchbuffer *batch;
+
+static void exec(int fd, uint32_t handle)
+{
+	struct drm_i915_gem_execbuffer2 execbuf;
+	struct drm_i915_gem_exec_object2 gem_exec[1];
+	int ret = 0;
+
+	gem_exec[0].handle = handle;
+	gem_exec[0].relocation_count = 0;
+	gem_exec[0].relocs_ptr = 0;
+	gem_exec[0].alignment = 0;
+	gem_exec[0].offset = 0;
+	gem_exec[0].flags = 0;
+	gem_exec[0].rsvd1 = 0;
+	gem_exec[0].rsvd2 = 0;
+
+	execbuf.buffers_ptr = (uintptr_t)gem_exec;
+	execbuf.buffer_count = 1;
+	execbuf.batch_start_offset = 0;
+	execbuf.batch_len = 4096;
+	execbuf.cliprects_ptr = 0;
+	execbuf.num_cliprects = 0;
+	execbuf.DR1 = 0;
+	execbuf.DR4 = 0;
+	execbuf.flags = 0;
+	execbuf.rsvd1 = 0;
+	execbuf.rsvd2 = 0;
+
+	ret = drmIoctl(fd,
+		       DRM_IOCTL_I915_GEM_EXECBUFFER2,
+		       &execbuf);
+	gem_sync(fd, handle);
+	assert(ret == 0);
+}
+
+int main(int argc, char **argv)
+{
+	uint32_t batch_end[2] = {MI_BATCH_BUFFER_END};
+	int fd, i, ret;
+	uint64_t aper_size;
+	int count;
+	drm_intel_bo *sample_batch_bo;
+
+	fd = drm_open_any();
+
+	bufmgr = drm_intel_bufmgr_gem_init(fd, 4096);
+	if (!bufmgr) {
+		fprintf(stderr, "failed to init libdrm\n");
+		exit(-1);
+	}
+
+	drm_intel_bufmgr_gem_enable_reuse(bufmgr);
+	
+	aper_size = gem_aperture_size(fd);
+
+	/* presume a big per-bo overhead */
+	if (intel_get_total_ram_mb() < (aper_size / (1024*1024)) * 3 / 2) {
+		fprintf(stderr, "not enough mem to run test\n");
+		return 77;
+	}
+
+	count = aper_size / 4096;
+
+	batch = intel_batchbuffer_alloc(bufmgr, intel_get_drm_devid(fd));
+	assert(batch);
+
+	sample_batch_bo = drm_intel_bo_alloc(bufmgr, "", 4096, 4096);
+	assert(sample_batch_bo);
+	ret = drm_intel_bo_subdata(sample_batch_bo, 4096-sizeof(batch_end),
+				   sizeof(batch_end), batch_end);
+	assert(ret == 0);
+
+	/* fill the entire gart with batches and run them */
+	for (i = 0; i < count; i++) {
+		drm_intel_bo *batch_bo;
+
+		batch_bo = drm_intel_bo_alloc(bufmgr, "", 4096, 4096);
+		assert(batch_bo);
+
+		/* copy the sample batch with the gpu to the new one, so that we
+		 * also test the unmappable part of the gtt. */
+		BEGIN_BATCH(8);
+		OUT_BATCH(XY_SRC_COPY_BLT_CMD |
+			  XY_SRC_COPY_BLT_WRITE_ALPHA |
+			  XY_SRC_COPY_BLT_WRITE_RGB);
+		OUT_BATCH((3 << 24) | /* 32 bits */
+			  (0xcc << 16) | /* copy ROP */
+			  4096);
+		OUT_BATCH(0); /* dst y1,x1 */
+		OUT_BATCH((1 << 16) | 1024);
+		OUT_RELOC(batch_bo, I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, 0);
+		OUT_BATCH((0 << 16) | 0); /* src x1, y1 */
+		OUT_BATCH(4096);
+		OUT_RELOC(sample_batch_bo, I915_GEM_DOMAIN_RENDER, 0, 0);
+		ADVANCE_BATCH();
+
+		intel_batchbuffer_flush(batch);
+		if (i % 100 == 0)
+			gem_sync(fd, batch_bo->handle);
+
+		drm_intel_bo_disable_reuse(batch_bo);
+
+		/* launch the newly created batch */
+		exec(fd, batch_bo->handle);
+
+		// leak buffers
+		//drm_intel_bo_unreference(batch_bo);
+	}
+
+	drm_intel_bufmgr_destroy(bufmgr);
+
+	close(fd);
+
+	return 0;
+}