ntel-gpu-tools/tests/gem_exec_reloc.c

/*
 * Copyright © 2016 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.
 */

#include "igt.h"

IGT_TEST_DESCRIPTION("Basic sanity check of execbuf-ioctl relocations.");

static uint32_t find_last_set(uint64_t x)
{
	uint32_t i = 0;
	while (x) {
		x >>= 1;
		i++;
	}
	return i;
}

static void write_dword(int fd,
			uint32_t target_handle,
			uint64_t target_offset,
			uint32_t value)
{
	int gen = intel_gen(intel_get_drm_devid(fd));
	struct drm_i915_gem_execbuffer2 execbuf;
	struct drm_i915_gem_exec_object2 obj[2];
	struct drm_i915_gem_relocation_entry reloc;
	uint32_t buf[16];
	int i;

	memset(obj, 0, sizeof(obj));
	obj[0].handle = target_handle;
	obj[1].handle = gem_create(fd, 4096);

	i = 0;
	buf[i++] = MI_STORE_DWORD_IMM;
	if (gen >= 8) {
		buf[i++] = target_offset;
		buf[i++] = target_offset >> 32;
	} else if (gen >= 4) {
		buf[i++] = 0;
		buf[i++] = target_offset;
	} else {
		buf[i-1]--;
		buf[i-1] |= 1 << 22;
		buf[i++] = target_offset;
	}
	buf[i++] = value;
	buf[i++] = MI_BATCH_BUFFER_END;
	gem_write(fd, obj[1].handle, 0, buf, sizeof(buf));

	memset(&reloc, 0, sizeof(reloc));
	if (gen >= 8 || gen < 4)
		reloc.offset = sizeof(uint32_t);
	else
		reloc.offset = 2*sizeof(uint32_t);
	reloc.target_handle = target_handle;
	reloc.delta = target_offset;
	reloc.read_domains = I915_GEM_DOMAIN_INSTRUCTION;
	reloc.write_domain = I915_GEM_DOMAIN_INSTRUCTION;

	obj[1].relocation_count = 1;
	obj[1].relocs_ptr = (uintptr_t)&reloc;

	memset(&execbuf, 0, sizeof(execbuf));
	execbuf.buffers_ptr = (uintptr_t)obj;
	execbuf.buffer_count = 2;
	gem_execbuf(fd, &execbuf);
	gem_close(fd, obj[1].handle);
}

static void from_mmap(int fd, uint64_t size, int use_gtt)
{
	uint32_t bbe = MI_BATCH_BUFFER_END;
	struct drm_i915_gem_execbuffer2 execbuf;
	struct drm_i915_gem_exec_object2 obj;
	struct drm_i915_gem_relocation_entry *relocs;
	uint64_t value;
	uint64_t max, i;

	intel_require_memory(1, size, CHECK_RAM);

	memset(&obj, 0, sizeof(obj));
	obj.handle = gem_create(fd, 4096);
	gem_write(fd, obj.handle, 0, &bbe, sizeof(bbe));

	max = size / sizeof(*relocs);
	if (use_gtt < 0) {
		relocs = mmap(0, size,
			      PROT_WRITE, MAP_PRIVATE | MAP_ANON,
			      -1, 0);
		igt_assert(relocs != (void *)-1);
	} else if (use_gtt) {
		uint32_t reloc_handle;

		reloc_handle = gem_create(fd, size);
		relocs = gem_mmap__gtt(fd, reloc_handle, size, PROT_WRITE);
		gem_set_domain(fd, reloc_handle,
				I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT);
		gem_close(fd, reloc_handle);
	} else {
		uint32_t reloc_handle;

		reloc_handle = gem_create(fd, size);
		relocs = gem_mmap__cpu(fd, reloc_handle, 0, size, PROT_WRITE);
		gem_set_domain(fd, reloc_handle,
			       I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
		gem_close(fd, reloc_handle);
	}

	for (i = 0; i < max; i++) {
		relocs[i].target_handle = obj.handle;
		relocs[i].presumed_offset = 0;
		relocs[i].offset = 1024;
		relocs[i].delta = i;
		relocs[i].read_domains = I915_GEM_DOMAIN_INSTRUCTION;
		relocs[i].write_domain = 0;
	}
	obj.relocation_count = max;
	obj.relocs_ptr = (uintptr_t)relocs;

	memset(&execbuf, 0, sizeof(execbuf));
	execbuf.buffers_ptr = (uintptr_t)&obj;
	execbuf.buffer_count = 1;
	gem_execbuf(fd, &execbuf);
	gem_read(fd, obj.handle, 1024, &value, sizeof(value));
	gem_close(fd, obj.handle);

	igt_assert_eq_u64(value, obj.offset + max - 1);
	for (i = 0; i < max; i++) {
		if (relocs[i].presumed_offset == ~0ull)
			continue;

		igt_assert_eq_u64(relocs[i].presumed_offset, obj.offset);
	}
	munmap(relocs, size);
}

static void from_gpu(int fd)
{
	uint32_t bbe = MI_BATCH_BUFFER_END;
	struct drm_i915_gem_execbuffer2 execbuf;
	struct drm_i915_gem_exec_object2 obj;
	struct drm_i915_gem_relocation_entry *relocs;
	uint32_t reloc_handle;
	uint64_t value;

	memset(&obj, 0, sizeof(obj));
	obj.handle = gem_create(fd, 4096);
	gem_write(fd, obj.handle, 0, &bbe, sizeof(bbe));

	reloc_handle = gem_create(fd, 4096);
	write_dword(fd,
		    reloc_handle,
		    offsetof(struct drm_i915_gem_relocation_entry,
			     target_handle),
		    obj.handle);
	write_dword(fd,
		    reloc_handle,
		    offsetof(struct drm_i915_gem_relocation_entry,
			     offset),
		    1024);
	write_dword(fd,
		    reloc_handle,
		    offsetof(struct drm_i915_gem_relocation_entry,
			     read_domains),
		    I915_GEM_DOMAIN_INSTRUCTION);

	relocs = gem_mmap__cpu(fd, reloc_handle, 0, 4096, PROT_READ);
	gem_set_domain(fd, reloc_handle,
		       I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
	gem_close(fd, reloc_handle);

	obj.relocation_count = 1;
	obj.relocs_ptr = (uintptr_t)relocs;

	memset(&execbuf, 0, sizeof(execbuf));
	execbuf.buffers_ptr = (uintptr_t)&obj;
	execbuf.buffer_count = 1;
	gem_execbuf(fd, &execbuf);
	gem_read(fd, obj.handle, 1024, &value, sizeof(value));
	gem_close(fd, obj.handle);

	igt_assert_eq_u64(value, obj.offset);
	igt_assert_eq_u64(relocs->presumed_offset, obj.offset);
	munmap(relocs, 4096);
}

igt_main
{
	uint64_t size;
	int fd = -1;

	igt_fixture
		fd = drm_open_driver(DRIVER_INTEL);

	for (size = 4096; size <= 4ull*1024*1024*1024; size <<= 1) {
		igt_subtest_f("mmap-%u", find_last_set(size) - 1)
			from_mmap(fd, size, -1);
		igt_subtest_f("cpu-%u", find_last_set(size) - 1)
			from_mmap(fd, size, 0);
		igt_subtest_f("gtt-%u", find_last_set(size) - 1)
			from_mmap(fd, size, 1);
	}

	igt_subtest("gpu")
		from_gpu(fd);

	igt_fixture
		close(fd);
}