tests/gem_set_tiling_vs_blt.c

/*
 * Copyright © 2012 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>
 *
 */

/** @file gem_set_tiling_vs_blt.c
 *
 * Testcase: Check for proper synchronization of tiling changes vs. tiled gpu
 * access
 *
 * The blitter on gen3 and earlier needs properly set up fences. Which also
 * means that for untiled blits we may not set up a fence before that blt has
 * finished.
 *
 * Current kernels have a bug there, but it's pretty hard to hit because you
 * need:
 * - a blt on an untiled object which is aligned correctly for tiling.
 * - a set_tiling to switch that object to tiling
 * - another blt without any intervening cpu access that uses this object.
 *
 * Testcase has been extended to also check tiled->untiled and tiled->tiled
 * transitions (i.e. changing stride).
 */

#include "igt.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <inttypes.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <stdbool.h>
#include "drm.h"
#include "intel_bufmgr.h"

IGT_TEST_DESCRIPTION("Check for proper synchronization of tiling changes vs."
		     " tiled gpu access.");

static drm_intel_bufmgr *bufmgr;
struct intel_batchbuffer *batch;
uint32_t devid;

#define TEST_SIZE (1024*1024)
#define TEST_STRIDE (4*1024)
#define TEST_HEIGHT(stride)	(TEST_SIZE/(stride))
#define TEST_WIDTH(stride)	((stride)/4)

uint32_t data[TEST_SIZE/4];

static void do_test(uint32_t tiling, unsigned stride,
		    uint32_t tiling_after, unsigned stride_after)
{
	drm_intel_bo *busy_bo, *test_bo, *target_bo;
	int i, ret;
	uint32_t *ptr;
	uint32_t test_bo_handle;
	uint32_t blt_stride, blt_bits;
	bool tiling_changed = false;

	igt_info("filling ring .. ");
	busy_bo = drm_intel_bo_alloc(bufmgr, "busy bo bo", 16*1024*1024, 4096);

	for (i = 0; i < 250; i++) {
		BLIT_COPY_BATCH_START(0);
		OUT_BATCH((3 << 24) | /* 32 bits */
			  (0xcc << 16) | /* copy ROP */
			  2*1024*4);
		OUT_BATCH(0 << 16 | 1024);
		OUT_BATCH((2048) << 16 | (2048));
		OUT_RELOC_FENCED(busy_bo, I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, 0);
		OUT_BATCH(0 << 16 | 0);
		OUT_BATCH(2*1024*4);
		OUT_RELOC_FENCED(busy_bo, I915_GEM_DOMAIN_RENDER, 0, 0);
		ADVANCE_BATCH();

		if (batch->gen >= 6) {
			BEGIN_BATCH(3, 0);
			OUT_BATCH(XY_SETUP_CLIP_BLT_CMD);
			OUT_BATCH(0);
			OUT_BATCH(0);
			ADVANCE_BATCH();
		}
	}
	intel_batchbuffer_flush(batch);

	igt_info("playing tricks .. ");
	/* first allocate the target so it gets out of the way of playing funky
	 * tricks */
	target_bo = drm_intel_bo_alloc(bufmgr, "target bo", TEST_SIZE, 4096);

	/* allocate buffer with parameters _after_ transition we want to check
	 * and touch it, so that it's properly aligned in the gtt. */
	test_bo = drm_intel_bo_alloc(bufmgr, "tiled busy bo", TEST_SIZE, 4096);
	test_bo_handle = test_bo->handle;
	ret = drm_intel_bo_set_tiling(test_bo, &tiling_after, stride_after);
	igt_assert_eq(ret, 0);
	drm_intel_gem_bo_map_gtt(test_bo);
	ptr = test_bo->virtual;
	*ptr = 0;
	ptr = NULL;
	drm_intel_gem_bo_unmap_gtt(test_bo);

	drm_intel_bo_unreference(test_bo);

	test_bo = NULL;

	/* note we need a bo bigger than batches, otherwise the buffer reuse
	 * trick will fail. */
	test_bo = drm_intel_bo_alloc(bufmgr, "busy bo", TEST_SIZE, 4096);
	/* double check that the reuse trick worked */
	igt_assert(test_bo_handle == test_bo->handle);

	test_bo_handle = test_bo->handle;
	/* ensure we have the right tiling before we start. */
	ret = drm_intel_bo_set_tiling(test_bo, &tiling, stride);
	igt_assert_eq(ret, 0);

	if (tiling == I915_TILING_NONE) {
		drm_intel_bo_subdata(test_bo, 0, TEST_SIZE, data);
	} else {
		drm_intel_gem_bo_map_gtt(test_bo);
		ptr = test_bo->virtual;
		memcpy(ptr, data, TEST_SIZE);
		ptr = NULL;
		drm_intel_gem_bo_unmap_gtt(test_bo);
	}

	blt_stride = stride;
	blt_bits = 0;
	if (intel_gen(devid) >= 4 && tiling != I915_TILING_NONE) {
		blt_stride /= 4;
		blt_bits = XY_SRC_COPY_BLT_SRC_TILED;
	}

	BLIT_COPY_BATCH_START(blt_bits);
	OUT_BATCH((3 << 24) | /* 32 bits */
		  (0xcc << 16) | /* copy ROP */
		  stride);
	OUT_BATCH(0 << 16 | 0);
	OUT_BATCH((TEST_HEIGHT(stride)) << 16 | (TEST_WIDTH(stride)));
	OUT_RELOC_FENCED(target_bo, I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, 0);
	OUT_BATCH(0 << 16 | 0);
	OUT_BATCH(blt_stride);
	OUT_RELOC_FENCED(test_bo, I915_GEM_DOMAIN_RENDER, 0, 0);
	ADVANCE_BATCH();
	intel_batchbuffer_flush(batch);

	drm_intel_bo_unreference(test_bo);

	test_bo = drm_intel_bo_alloc_for_render(bufmgr, "tiled busy bo", TEST_SIZE, 4096);
	/* double check that the reuse trick worked */
	igt_assert(test_bo_handle == test_bo->handle);
	ret = drm_intel_bo_set_tiling(test_bo, &tiling_after, stride_after);
	igt_assert_eq(ret, 0);

	/* Note: We don't care about gen4+ here because the blitter doesn't use
	 * fences there. So not setting tiling flags on the tiled buffer is ok.
	 */
	BLIT_COPY_BATCH_START(0);
	OUT_BATCH((3 << 24) | /* 32 bits */
		  (0xcc << 16) | /* copy ROP */
		  stride_after);
	OUT_BATCH(0 << 16 | 0);
	OUT_BATCH((1) << 16 | (1));
	OUT_RELOC_FENCED(test_bo, I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, 0);
	OUT_BATCH(0 << 16 | 0);
	OUT_BATCH(stride_after);
	OUT_RELOC_FENCED(test_bo, I915_GEM_DOMAIN_RENDER, 0, 0);
	ADVANCE_BATCH();
	intel_batchbuffer_flush(batch);

	/* Now try to trick the kernel the kernel into changing up the fencing
	 * too early. */

	igt_info("checking .. ");
	memset(data, 0, TEST_SIZE);
	drm_intel_bo_get_subdata(target_bo, 0, TEST_SIZE, data);
	for (i = 0; i < TEST_SIZE/4; i++)
		igt_assert(data[i] == i);

	/* check whether tiling on the test_bo actually changed. */
	drm_intel_gem_bo_map_gtt(test_bo);
	ptr = test_bo->virtual;
	for (i = 0; i < TEST_SIZE/4; i++)
		if (ptr[i] != data[i])
			tiling_changed = true;
	ptr = NULL;
	drm_intel_gem_bo_unmap_gtt(test_bo);
	igt_assert(tiling_changed);

	drm_intel_bo_unreference(test_bo);
	drm_intel_bo_unreference(target_bo);
	drm_intel_bo_unreference(busy_bo);
	igt_info("done\n");
}

int fd;

igt_main
{
	int i;
	uint32_t tiling, tiling_after;

	igt_skip_on_simulation();

	igt_fixture {
		for (i = 0; i < 1024*256; i++)
			data[i] = i;

		fd = drm_open_driver(DRIVER_INTEL);

		bufmgr = drm_intel_bufmgr_gem_init(fd, 4096);
		drm_intel_bufmgr_gem_enable_reuse(bufmgr);
		devid = intel_get_drm_devid(fd);
		batch = intel_batchbuffer_alloc(bufmgr, devid);
	}

	igt_subtest("untiled-to-tiled") {
		tiling = I915_TILING_NONE;
		tiling_after = I915_TILING_X;
		do_test(tiling, TEST_STRIDE, tiling_after, TEST_STRIDE);
		igt_assert(tiling == I915_TILING_NONE);
		igt_assert(tiling_after == I915_TILING_X);
	}

	igt_subtest("tiled-to-untiled") {
		tiling = I915_TILING_X;
		tiling_after = I915_TILING_NONE;
		do_test(tiling, TEST_STRIDE, tiling_after, TEST_STRIDE);
		igt_assert(tiling == I915_TILING_X);
		igt_assert(tiling_after == I915_TILING_NONE);
	}

	igt_subtest("tiled-to-tiled") {
		tiling = I915_TILING_X;
		tiling_after = I915_TILING_X;
		do_test(tiling, TEST_STRIDE/2, tiling_after, TEST_STRIDE);
		igt_assert(tiling == I915_TILING_X);
		igt_assert(tiling_after == I915_TILING_X);
	}
}