tests/gem_eio.c

/*
 * Copyright © 2015 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.
 *
 */

/*
 * Testcase: Test that only specific ioctl report a wedged GPU.
 *
 */

#include "igt.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <inttypes.h>
#include <errno.h>
#include <sys/ioctl.h>

#include <drm.h>


IGT_TEST_DESCRIPTION("Test that specific ioctls report a wedged GPU (EIO).");

static bool i915_reset_control(bool enable)
{
	const char *path = "/sys/module/i915/parameters/reset";
	int fd, ret;

	igt_debug("%s GPU reset\n", enable ? "Enabling" : "Disabling");

	fd = open(path, O_RDWR);
	igt_require(fd >= 0);

	ret = write(fd, &"NY"[enable], 1) == 1;
	close(fd);

	return ret;
}

static bool i915_wedged_set(void)
{
	int fd, ret;

	igt_debug("Triggering GPU reset\n");

	fd = igt_debugfs_open("i915_wedged", O_RDWR);
	igt_require(fd >= 0);

	ret = write(fd, "1\n", 2) == 2;
	close(fd);

	return ret;
}

static void trigger_reset(int fd)
{
	igt_assert(i915_wedged_set());

	/* And just check the gpu is indeed running again */
	igt_debug("Checking that the GPU recovered\n");
	gem_quiescent_gpu(fd);
}

static void wedge_gpu(int fd)
{
	/* First idle the GPU then disable GPU resets before injecting a hang */
	gem_quiescent_gpu(fd);

	igt_require(i915_reset_control(false));

	igt_debug("Wedging GPU by injecting hang\n");
	igt_post_hang_ring(fd, igt_hang_ring(fd, I915_EXEC_DEFAULT));

	igt_assert(i915_reset_control(true));
}

static int __gem_throttle(int fd)
{
	int err = 0;
	if (drmIoctl(fd, DRM_IOCTL_I915_GEM_THROTTLE, NULL))
		err = -errno;
	return err;
}

static void test_throttle(int fd)
{
	wedge_gpu(fd);

	igt_assert_eq(__gem_throttle(fd), -EIO);

	trigger_reset(fd);
}

static int __gem_execbuf(int fd, struct drm_i915_gem_execbuffer2 *eb)
{
	int err = 0;
	if (drmIoctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, eb))
		err = -errno;
	return err;
}

static void test_execbuf(int fd)
{
	struct drm_i915_gem_execbuffer2 execbuf;
	struct drm_i915_gem_exec_object2 exec;
	uint32_t tmp[] = { MI_BATCH_BUFFER_END };

	memset(&exec, 0, sizeof(exec));
	memset(&execbuf, 0, sizeof(execbuf));

	exec.handle = gem_create(fd, 4096);
	gem_write(fd, exec.handle, 0, tmp, sizeof(tmp));

	execbuf.buffers_ptr = (uintptr_t)&exec;
	execbuf.buffer_count = 1;

	wedge_gpu(fd);

	igt_assert_eq(__gem_execbuf(fd, &execbuf), -EIO);
	gem_close(fd, exec.handle);

	trigger_reset(fd);
}

static int __gem_wait(int fd, uint32_t handle, int64_t timeout)
{
	struct drm_i915_gem_wait wait;
	int err = 0;

	memset(&wait, 0, sizeof(wait));
	wait.bo_handle = handle;
	wait.timeout_ns = timeout;
	if (drmIoctl(fd, DRM_IOCTL_I915_GEM_WAIT, &wait))
		err = -errno;

	return err;
}

static void test_wait(int fd)
{
	igt_hang_ring_t hang;

	/* If the request we wait on completes due to a hang (even for
	 * that request), the user expects the return value to 0 (success).
	 */
	hang = igt_hang_ring(fd, I915_EXEC_DEFAULT);
	igt_assert_eq(__gem_wait(fd, hang.handle, -1), 0);
	igt_post_hang_ring(fd, hang);

	/* If the GPU is wedged during the wait, again we expect the return
	 * value to be 0 (success).
	 */
	igt_require(i915_reset_control(false));
	hang = igt_hang_ring(fd, I915_EXEC_DEFAULT);
	igt_assert_eq(__gem_wait(fd, hang.handle, -1), 0);
	igt_post_hang_ring(fd, hang);
	igt_require(i915_reset_control(true));

	trigger_reset(fd);
}

igt_main
{
	int fd = -1;

	igt_skip_on_simulation();

	igt_fixture {
		fd = drm_open_driver(DRIVER_INTEL);
		igt_require_hang_ring(fd, I915_EXEC_DEFAULT);
	}

	igt_subtest("throttle")
		test_throttle(fd);

	igt_subtest("execbuf")
		test_execbuf(fd);

	igt_subtest("wait")
		test_wait(fd);

	igt_fixture
		close(fd);
}