tests/gem_caching.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>
 *    Chris Wilson <chris@chris-wilson.co.uk>
 *
 */

#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 <drm.h>

#include "intel_bufmgr.h"

IGT_TEST_DESCRIPTION("Test snoop consistency when touching partial"
		     " cachelines.");

/*
 * Testcase: snoop consistency when touching partial cachelines
 *
 */

static drm_intel_bufmgr *bufmgr;
struct intel_batchbuffer *batch;

drm_intel_bo *scratch_bo;
drm_intel_bo *staging_bo;
#define BO_SIZE (4*4096)
uint32_t devid;
uint64_t mappable_gtt_limit;
int fd;

static void
copy_bo(drm_intel_bo *src, drm_intel_bo *dst)
{
	BLIT_COPY_BATCH_START(0);
	OUT_BATCH((3 << 24) | /* 32 bits */
		  (0xcc << 16) | /* copy ROP */
		  4096);
	OUT_BATCH(0 << 16 | 0);
	OUT_BATCH((BO_SIZE/4096) << 16 | 1024);
	OUT_RELOC_FENCED(dst, I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, 0);
	OUT_BATCH(0 << 16 | 0);
	OUT_BATCH(4096);
	OUT_RELOC_FENCED(src, I915_GEM_DOMAIN_RENDER, 0, 0);
	ADVANCE_BATCH();

	intel_batchbuffer_flush(batch);
}

static void
blt_bo_fill(drm_intel_bo *tmp_bo, drm_intel_bo *bo, uint8_t val)
{
	uint8_t *gtt_ptr;
	int i;

	do_or_die(drm_intel_gem_bo_map_gtt(tmp_bo));
	gtt_ptr = tmp_bo->virtual;

	for (i = 0; i < BO_SIZE; i++)
		gtt_ptr[i] = val;

	drm_intel_gem_bo_unmap_gtt(tmp_bo);

	if (bo->offset < mappable_gtt_limit &&
	    (IS_G33(devid) || intel_gen(devid) >= 4))
		igt_trash_aperture();

	copy_bo(tmp_bo, bo);
}

#define MAX_BLT_SIZE 128
#define ROUNDS 1000
#define TEST_READ 0x1
#define TEST_WRITE 0x2
#define TEST_BOTH (TEST_READ | TEST_WRITE)
igt_main
{
	unsigned flags = TEST_BOTH;
	int i, j;
	uint8_t *cpu_ptr;
	uint8_t *gtt_ptr;

	igt_skip_on_simulation();

	igt_fixture {
		srandom(0xdeadbeef);

		fd = drm_open_driver(DRIVER_INTEL);

		igt_require_gem(fd);
		gem_require_caching(fd);

		devid = intel_get_drm_devid(fd);
		if (IS_GEN2(devid)) /* chipset only handles cached -> uncached */
			flags &= ~TEST_READ;
		if (IS_BROADWATER(devid) || IS_CRESTLINE(devid)) {
			/* chipset is completely fubar */
			igt_info("coherency broken on i965g/gm\n");
			flags = 0;
		}

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

		/* overallocate the buffers we're actually using because */
		scratch_bo = drm_intel_bo_alloc(bufmgr, "scratch bo", BO_SIZE, 4096);
		gem_set_caching(fd, scratch_bo->handle, 1);

		staging_bo = drm_intel_bo_alloc(bufmgr, "staging bo", BO_SIZE, 4096);

		igt_init_aperture_trashers(bufmgr);
		mappable_gtt_limit = gem_mappable_aperture_size();
	}

	igt_subtest("reads") {
		igt_require(flags & TEST_READ);

		igt_info("checking partial reads\n");

		for (i = 0; i < ROUNDS; i++) {
			uint8_t val0 = i;
			int start, len;

			blt_bo_fill(staging_bo, scratch_bo, i);

			start = random() % BO_SIZE;
			len = random() % (BO_SIZE-start) + 1;

			drm_intel_bo_map(scratch_bo, false);
			cpu_ptr = scratch_bo->virtual;
			for (j = 0; j < len; j++) {
				igt_assert_f(cpu_ptr[j] == val0,
					     "mismatch at %i, got: %i, expected: %i\n",
					     j, cpu_ptr[j], val0);
			}
			drm_intel_bo_unmap(scratch_bo);

			igt_progress("partial reads test: ", i, ROUNDS);
		}
	}

	igt_subtest("writes") {
		igt_require(flags & TEST_WRITE);

		igt_info("checking partial writes\n");

		for (i = 0; i < ROUNDS; i++) {
			uint8_t val0 = i, val1;
			int start, len;

			blt_bo_fill(staging_bo, scratch_bo, val0);

			start = random() % BO_SIZE;
			len = random() % (BO_SIZE-start) + 1;

			val1 = val0 + 63;
			drm_intel_bo_map(scratch_bo, true);
			cpu_ptr = scratch_bo->virtual;
			memset(cpu_ptr + start, val1, len);
			drm_intel_bo_unmap(scratch_bo);

			copy_bo(scratch_bo, staging_bo);
			do_or_die(drm_intel_gem_bo_map_gtt(staging_bo));
			gtt_ptr = staging_bo->virtual;

			for (j = 0; j < start; j++) {
				igt_assert_f(gtt_ptr[j] == val0,
					     "mismatch at %i, partial=[%d+%d] got: %i, expected: %i\n",
					     j, start, len, gtt_ptr[j], val0);
			}
			for (; j < start + len; j++) {
				igt_assert_f(gtt_ptr[j] == val1,
					     "mismatch at %i, partial=[%d+%d] got: %i, expected: %i\n",
					     j, start, len, gtt_ptr[j], val1);
			}
			for (; j < BO_SIZE; j++) {
				igt_assert_f(gtt_ptr[j] == val0,
					     "mismatch at %i, partial=[%d+%d] got: %i, expected: %i\n",
					     j, start, len, gtt_ptr[j], val0);
			}
			drm_intel_gem_bo_unmap_gtt(staging_bo);

			igt_progress("partial writes test: ", i, ROUNDS);
		}
	}

	igt_subtest("read-writes") {
		igt_require((flags & TEST_BOTH) == TEST_BOTH);

		igt_info("checking partial writes after partial reads\n");

		for (i = 0; i < ROUNDS; i++) {
			uint8_t val0 = i, val1, val2;
			int start, len;

			blt_bo_fill(staging_bo, scratch_bo, val0);

			/* partial read */
			start = random() % BO_SIZE;
			len = random() % (BO_SIZE-start) + 1;

			do_or_die(drm_intel_bo_map(scratch_bo, false));
			cpu_ptr = scratch_bo->virtual;
			for (j = 0; j < len; j++) {
				igt_assert_f(cpu_ptr[j] == val0,
					     "mismatch in read at %i, got: %i, expected: %i\n",
					     j, cpu_ptr[j], val0);
			}
			drm_intel_bo_unmap(scratch_bo);

			/* Change contents through gtt to make the pread cachelines
			 * stale. */
			val1 = i + 17;
			blt_bo_fill(staging_bo, scratch_bo, val1);

			/* partial write */
			start = random() % BO_SIZE;
			len = random() % (BO_SIZE-start) + 1;

			val2 = i + 63;
			do_or_die(drm_intel_bo_map(scratch_bo, false));
			cpu_ptr = scratch_bo->virtual;
			memset(cpu_ptr + start, val2, len);

			copy_bo(scratch_bo, staging_bo);
			do_or_die(drm_intel_gem_bo_map_gtt(staging_bo));
			gtt_ptr = staging_bo->virtual;

			for (j = 0; j < start; j++) {
				igt_assert_f(gtt_ptr[j] == val1,
					     "mismatch at %i, partial=[%d+%d] got: %i, expected: %i\n",
					     j, start, len, gtt_ptr[j], val1);
			}
			for (; j < start + len; j++) {
				igt_assert_f(gtt_ptr[j] == val2,
					     "mismatch at %i, partial=[%d+%d] got: %i, expected: %i\n",
					     j, start, len, gtt_ptr[j], val2);
			}
			for (; j < BO_SIZE; j++) {
				igt_assert_f(gtt_ptr[j] == val1,
					     "mismatch at %i, partial=[%d+%d] got: %i, expected: %i\n",
					     j, start, len, gtt_ptr[j], val1);
			}
			drm_intel_gem_bo_unmap_gtt(staging_bo);
			drm_intel_bo_unmap(scratch_bo);

			igt_progress("partial read/writes test: ", i, ROUNDS);
		}
	}

	igt_fixture {
		igt_cleanup_aperture_trashers();
		drm_intel_bufmgr_destroy(bufmgr);

		close(fd);
	}
}