path: root/tests/kms_flip.c

/*
 * Copyright 2012 Intel Corporation
 *   Jesse Barnes <jesse.barnes@intel.com>
 *
 * 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 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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <cairo.h>
#include <errno.h>
#include <fcntl.h>
#include <math.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/poll.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <linux/kd.h>
#include <time.h>
#include <pthread.h>

#include "ioctl_wrappers.h"
#include "drmtest.h"
#include "intel_chipset.h"
#include "intel_batchbuffer.h"
#include "igt_kms.h"
#include "igt_aux.h"
#include "igt_debugfs.h"

#define TEST_DPMS		(1 << 0)
#define TEST_WITH_DUMMY_BCS	(1 << 1)
#define TEST_WITH_DUMMY_RCS	(1 << 2)
#define TEST_PAN		(1 << 3)
#define TEST_MODESET		(1 << 4)
#define TEST_CHECK_TS		(1 << 5)
#define TEST_EBUSY		(1 << 6)
#define TEST_EINVAL		(1 << 7)
#define TEST_FLIP		(1 << 8)
#define TEST_VBLANK		(1 << 9)
#define TEST_VBLANK_BLOCK	(1 << 10)
#define TEST_VBLANK_ABSOLUTE	(1 << 11)
#define TEST_VBLANK_EXPIRED_SEQ	(1 << 12)
#define TEST_FB_RECREATE	(1 << 13)
#define TEST_RMFB		(1 << 14)
#define TEST_HANG		(1 << 15)
#define TEST_NOEVENT		(1 << 16)
#define TEST_FB_BAD_TILING	(1 << 17)
#define TEST_SINGLE_BUFFER	(1 << 18)
#define TEST_DPMS_OFF		(1 << 19)
#define TEST_NO_2X_OUTPUT	(1 << 20)
#define TEST_DPMS_OFF_OTHERS	(1 << 21)
#define TEST_ENOENT		(1 << 22)
#define TEST_FENCE_STRESS	(1 << 23)
#define TEST_VBLANK_RACE	(1 << 24)
#define TEST_RPM		(1 << 25)
#define TEST_SUSPEND		(1 << 26)
#define TEST_TS_CONT		(1 << 27)
#define TEST_BO_TOOBIG		(1 << 28)
#define TEST_HANG_ONCE		(1 << 29)

#define EVENT_FLIP		(1 << 0)
#define EVENT_VBLANK		(1 << 1)

#ifndef DRM_CAP_TIMESTAMP_MONOTONIC
#define DRM_CAP_TIMESTAMP_MONOTONIC 6
#endif

#define max(a, b) ((a) > (b) ? (a) : (b))

drmModeRes *resources;
int drm_fd;
static drm_intel_bufmgr *bufmgr;
struct intel_batchbuffer *batch;
uint32_t devid;
int test_time = 3;
static bool monotonic_timestamp;
static pthread_t vblank_wait_thread;

static drmModeConnector *last_connector;

uint32_t *fb_ptr;

struct type_name {
	int type;
	const char *name;
};

struct event_state {
	const char *name;

	/*
	 * Event data for the last event that has already passed our check.
	 * Updated using the below current_* vars in update_state().
	 */
	struct timeval last_ts;			/* kernel reported timestamp */
	struct timeval last_received_ts;	/* the moment we received it */
	unsigned int last_seq;			/* kernel reported seq. num */

	/*
	 * Event data for for the current event that we just received and
	 * going to check for validity. Set in event_handler().
	 */
	struct timeval current_ts;		/* kernel reported timestamp */
	struct timeval current_received_ts;	/* the moment we received it */
	unsigned int current_seq;		/* kernel reported seq. num */

	int count;				/* # of events of this type */

	/* Step between the current and next 'target' sequence number. */
	int seq_step;
};

struct test_output {
	int mode_valid;
	drmModeModeInfo kmode[4];
	drmModeEncoder *kencoder[4];
	drmModeConnector *kconnector[4];
	uint32_t _connector[4];
	uint32_t _crtc[4];
	int count; /* 1:1 mapping between crtc:connector */
	int flags;
	int pipe; /* primary pipe for vblank */
	unsigned int current_fb_id;
	unsigned int fb_width;
	unsigned int fb_height;
	unsigned int fb_ids[3];
	int bpp, depth;
	struct igt_fb fb_info[3];

	struct event_state flip_state;
	struct event_state vblank_state;
	/* Overall step between each round */
	int seq_step;
	unsigned int pending_events;
	int flip_count;
};


static unsigned long gettime_us(void)
{
	struct timespec ts;

	clock_gettime(CLOCK_MONOTONIC, &ts);

	return ts.tv_sec * 1000000 + ts.tv_nsec / 1000;
}

static void emit_dummy_load__bcs(struct test_output *o)
{
	int i, limit;
	drm_intel_bo *dummy_bo, *target_bo, *tmp_bo;
	struct igt_fb *fb_info = &o->fb_info[o->current_fb_id];
	unsigned pitch = fb_info->stride;

	limit = intel_gen(devid) < 6 ? 500 : 5000;

	dummy_bo = drm_intel_bo_alloc(bufmgr, "dummy_bo", fb_info->size, 4096);
	igt_assert(dummy_bo);
	target_bo = gem_handle_to_libdrm_bo(bufmgr, drm_fd, "imported", fb_info->gem_handle);
	igt_assert(target_bo);

	for (i = 0; i < limit; i++) {
		BLIT_COPY_BATCH_START(devid, 0);
		OUT_BATCH((3 << 24) | /* 32 bits */
			  (0xcc << 16) | /* copy ROP */
			  pitch);
		OUT_BATCH(0 << 16 | 0);
		OUT_BATCH(o->fb_height << 16 | o->fb_width);
		OUT_RELOC_FENCED(dummy_bo, I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, 0);
		BLIT_RELOC_UDW(devid);
		OUT_BATCH(0 << 16 | 0);
		OUT_BATCH(pitch);
		OUT_RELOC_FENCED(target_bo, I915_GEM_DOMAIN_RENDER, 0, 0);
		BLIT_RELOC_UDW(devid);
		ADVANCE_BATCH();

		if (IS_GEN6(devid) || IS_GEN7(devid)) {
			BEGIN_BATCH(3);
			OUT_BATCH(XY_SETUP_CLIP_BLT_CMD);
			OUT_BATCH(0);
			OUT_BATCH(0);
			ADVANCE_BATCH();
		}

		tmp_bo = dummy_bo;
		dummy_bo = target_bo;
		target_bo = tmp_bo;
	}
	intel_batchbuffer_flush(batch);

	drm_intel_bo_unreference(dummy_bo);
	drm_intel_bo_unreference(target_bo);
}

static void emit_fence_stress(struct test_output *o)
{
	const int num_fences = gem_available_fences(drm_fd);
	struct igt_fb *fb_info = &o->fb_info[o->current_fb_id];
	struct drm_i915_gem_execbuffer2 execbuf;
	struct drm_i915_gem_exec_object2 *exec;
	uint32_t buf[2] = { MI_BATCH_BUFFER_END, 0 };
	drm_intel_bo **bo;
	int i;

	bo = calloc(sizeof(*bo), num_fences);
	exec = calloc(sizeof(*exec), num_fences+1);
	for (i = 0; i < num_fences - 1; i++) {
		uint32_t tiling = I915_TILING_X;
		unsigned long pitch = 0;
		bo[i] = drm_intel_bo_alloc_tiled(bufmgr,
						 "tiled bo", 1024, 1024, 4,
						 &tiling, &pitch, 0);
		exec[i].handle = bo[i]->handle;
		exec[i].flags = EXEC_OBJECT_NEEDS_FENCE;
	}
	exec[i].handle = fb_info->gem_handle;
	exec[i].flags = EXEC_OBJECT_NEEDS_FENCE;
	exec[++i].handle = gem_create(drm_fd, 4096);
	gem_write(drm_fd, exec[i].handle, 0, buf, sizeof(buf));

	memset(&execbuf, 0, sizeof(execbuf));
	execbuf.buffers_ptr = (uintptr_t)exec;
	execbuf.buffer_count = i + 1;
	execbuf.batch_len = sizeof(buf);
	if (HAS_BLT_RING(intel_get_drm_devid(drm_fd)))
		execbuf.flags = I915_EXEC_BLT;

	gem_execbuf(drm_fd, &execbuf);

	gem_close(drm_fd, exec[i].handle);
	for (i = 0; i < num_fences - 1; i++)
		drm_intel_bo_unreference(bo[i]);
	free(bo);
	free(exec);
}

static void emit_dummy_load__rcs(struct test_output *o)
{
	const struct igt_fb *fb_info = &o->fb_info[o->current_fb_id];
	igt_render_copyfunc_t copyfunc;
	struct igt_buf sb[2], *src, *dst;
	int i, limit;

	copyfunc = igt_get_render_copyfunc(devid);
	if (copyfunc == NULL)
		return emit_dummy_load__bcs(o);

	limit = intel_gen(devid) < 6 ? 500 : 5000;

	sb[0].bo = drm_intel_bo_alloc(bufmgr, "dummy_bo", fb_info->size, 4096);
	igt_assert(sb[0].bo);
	sb[0].size = sb[0].bo->size;
	sb[0].tiling = I915_TILING_NONE;
	sb[0].data = NULL;
	sb[0].num_tiles = sb[0].bo->size;
	sb[0].stride = 4 * o->fb_width;

	sb[1].bo = gem_handle_to_libdrm_bo(bufmgr, drm_fd, "imported", fb_info->gem_handle);
	igt_assert(sb[1].bo);
	sb[1].size = sb[1].bo->size;
	sb[1].tiling = fb_info->tiling;
	sb[1].data = NULL;
	sb[1].num_tiles = sb[1].bo->size;
	sb[1].stride = fb_info->stride;

	src = &sb[0];
	dst = &sb[1];

	for (i = 0; i < limit; i++) {
		struct igt_buf *tmp;

		copyfunc(batch, NULL,
			 src, 0, 0,
			 o->fb_width, o->fb_height,
			 dst, 0, 0);

		tmp = src;
		src = dst;
		dst = tmp;
	}
	intel_batchbuffer_flush(batch);

	drm_intel_bo_unreference(sb[0].bo);
	drm_intel_bo_unreference(sb[1].bo);
}

static void dpms_off_other_outputs(struct test_output *o)
{
	int i, n;
	drmModeConnector *connector;
	uint32_t connector_id;

	for (i = 0; i < resources->count_connectors; i++) {
		connector_id = resources->connectors[i];

		for (n = 0; n < o->count; n++) {
			if (connector_id == o->kconnector[n]->connector_id)
				goto next;
		}

		connector = drmModeGetConnector(drm_fd, connector_id);

		kmstest_set_connector_dpms(drm_fd, connector,  DRM_MODE_DPMS_ON);
		kmstest_set_connector_dpms(drm_fd, connector,  DRM_MODE_DPMS_OFF);

		drmModeFreeConnector(connector);
next:
		;
	}
}

static void set_dpms(struct test_output *o, int mode)
{
	for (int n = 0; n < o->count; n++)
		kmstest_set_connector_dpms(drm_fd, o->kconnector[n], mode);
}

static void set_flag(unsigned int *v, unsigned int flag)
{
	igt_assert(!(*v & flag));
	*v |= flag;
}

static void clear_flag(unsigned int *v, unsigned int flag)
{
	igt_assert(*v & flag);
	*v &= ~flag;
}

static int do_page_flip(struct test_output *o, uint32_t fb_id, bool event)
{
	int n, ret = 0;

	o->flip_count = 0;

	for (n = 0; ret == 0 && n < o->count; n++)
		ret = drmModePageFlip(drm_fd, o->_crtc[n], fb_id,
				      event ? DRM_MODE_PAGE_FLIP_EVENT : 0,
				      event ? (void *)((unsigned long)o | (n==0)) : NULL);

	if (ret == 0 && event)
		set_flag(&o->pending_events, EVENT_FLIP);

	return ret;
}

struct vblank_reply {
	unsigned int sequence;
	struct timeval ts;
};

static int __wait_for_vblank(unsigned int flags, int crtc_idx,
			      int target_seq, unsigned long ret_data,
			      struct vblank_reply *reply)
{
	drmVBlank wait_vbl;
	int ret;
	unsigned crtc_idx_mask;
	bool event = !(flags & TEST_VBLANK_BLOCK);

	memset(&wait_vbl, 0, sizeof(wait_vbl));

	crtc_idx_mask = crtc_idx << DRM_VBLANK_HIGH_CRTC_SHIFT;
	igt_assert(!(crtc_idx_mask & ~DRM_VBLANK_HIGH_CRTC_MASK));

	wait_vbl.request.type = crtc_idx_mask;
	if (flags & TEST_VBLANK_ABSOLUTE)
		wait_vbl.request.type |= DRM_VBLANK_ABSOLUTE;
	else
		wait_vbl.request.type |= DRM_VBLANK_RELATIVE;
	if (event) {
		wait_vbl.request.type |= DRM_VBLANK_EVENT;
		wait_vbl.request.signal = ret_data;
	}
	wait_vbl.request.sequence = target_seq;

	ret = drmWaitVBlank(drm_fd, &wait_vbl);

	if (ret == 0) {
		reply->ts.tv_sec = wait_vbl.reply.tval_sec;
		reply->ts.tv_usec = wait_vbl.reply.tval_usec;
		reply->sequence = wait_vbl.reply.sequence;
	} else
		ret = -errno;

	return ret;
}

static int do_wait_for_vblank(struct test_output *o, int pipe_id,
			      int target_seq, struct vblank_reply *reply)
{
	int ret;
	unsigned flags = o->flags;

	/* Absolute waits only works once we have a frame counter. */
	if (!(o->vblank_state.count > 0))
		flags &= ~TEST_VBLANK_ABSOLUTE;

	ret = __wait_for_vblank(flags, pipe_id, target_seq, (unsigned long)o,
				reply);
	if (ret == 0 && !(o->flags & TEST_VBLANK_BLOCK))
		set_flag(&o->pending_events, EVENT_VBLANK);

	return ret;
}

static bool
analog_tv_connector(struct test_output *o)
{
	uint32_t connector_type = o->kconnector[0]->connector_type;

	return connector_type == DRM_MODE_CONNECTOR_TV ||
		connector_type == DRM_MODE_CONNECTOR_9PinDIN ||
		connector_type == DRM_MODE_CONNECTOR_SVIDEO ||
		connector_type == DRM_MODE_CONNECTOR_Composite;
}

static void event_handler(struct event_state *es, unsigned int frame,
			  unsigned int sec, unsigned int usec)
{
	struct timeval now;

	if (monotonic_timestamp) {
		struct timespec ts;

		clock_gettime(CLOCK_MONOTONIC, &ts);
		now.tv_sec = ts.tv_sec;
		now.tv_usec = ts.tv_nsec / 1000;
	} else {
		gettimeofday(&now, NULL);
	}
	es->current_received_ts = now;

	es->current_ts.tv_sec = sec;
	es->current_ts.tv_usec = usec;
	es->current_seq = frame;
}

static void page_flip_handler(int fd, unsigned int frame, unsigned int sec,
			      unsigned int usec, void *data)
{
	int primary = (unsigned long)data & 1;
	struct test_output *o = (void *)((unsigned long)data & ~ 1);

	if (++o->flip_count == o->count)
		clear_flag(&o->pending_events, EVENT_FLIP);
	if (primary)
		event_handler(&o->flip_state, frame, sec, usec);
}

static double frame_time(struct test_output *o)
{
	return 1000.0 * 1000.0 / o->kmode[0].vrefresh;
}

static void *vblank_wait_thread_func(void *data)
{
	struct test_output *o = data;
	struct vblank_reply reply;
	int i;

	for (i = 0; i < 32; i++) {
		unsigned long start = gettime_us();
		__wait_for_vblank(TEST_VBLANK_BLOCK, o->pipe, 20, (unsigned long)o, &reply);
		if (gettime_us() - start > 2 * frame_time(o))
			return (void*)1;
	}

	return 0;
}

static void spawn_vblank_wait_thread(struct test_output *o)
{
	igt_assert(pthread_create(&vblank_wait_thread, NULL,
				  vblank_wait_thread_func, o) == 0);
}

static void join_vblank_wait_thread(void)
{
	igt_assert(pthread_join(vblank_wait_thread, NULL) == 0);
}

static void fixup_premature_vblank_ts(struct test_output *o,
				      struct event_state *es)
{
	/*
	 * In case a power off event preempts the completion of a
	 * wait-for-vblank event the kernel will return a wf-vblank event with
	 * a zeroed-out timestamp. In order that check_state() doesn't
	 * complain replace this ts with a valid ts. As we can't calculate the
	 * exact timestamp, just use the time we received the event.
	 */
	struct timeval tv;

	if (!(o->flags & (TEST_DPMS | TEST_MODESET)))
		return;

	if (o->vblank_state.current_ts.tv_sec != 0 ||
	    o->vblank_state.current_ts.tv_usec != 0)
		return;

	tv.tv_sec = 0;
	tv.tv_usec = 1;
	timersub(&es->current_received_ts, &tv, &es->current_ts);
}

static void vblank_handler(int fd, unsigned int frame, unsigned int sec,
			      unsigned int usec, void *data)
{
	struct test_output *o = data;

	clear_flag(&o->pending_events, EVENT_VBLANK);
	event_handler(&o->vblank_state, frame, sec, usec);
	fixup_premature_vblank_ts(o, &o->vblank_state);
}

static void check_state(struct test_output *o, struct event_state *es)
{
	struct timeval diff;
	double usec_interflip;

	timersub(&es->current_ts, &es->current_received_ts, &diff);
	if (!analog_tv_connector(o)) {
		igt_assert_f(diff.tv_sec < 0 || (diff.tv_sec == 0 && diff.tv_usec <= 2000),
			     "%s ts delayed for too long: %is, %iusec\n",
			     es->name, (int)diff.tv_sec, (int)diff.tv_usec);

	}

	if (es->count == 0)
		return;

	timersub(&es->current_ts, &es->last_received_ts, &diff);
	igt_assert_f(timercmp(&es->last_received_ts, &es->current_ts, <),
		     "%s ts before the %s was issued!\n"
		     "timerdiff %is, %ius\n",
		     es->name, es->name,
		     (int) diff.tv_sec, (int) diff.tv_usec);

	/* check only valid if no modeset happens in between, that increments by
	 * (1 << 23) on each step. This bounding matches the one in
	 * DRM_IOCTL_WAIT_VBLANK. */
	if (!(o->flags & (TEST_DPMS | TEST_MODESET)))
		igt_assert_f(es->current_seq - (es->last_seq + o->seq_step) <= 1UL << 23,
			     "unexpected %s seq %u, should be >= %u\n",
			     es->name, es->current_seq, es->last_seq + o->seq_step);

	/* Check that the vblank frame didn't wrap unexpectedly. */
	if (o->flags & TEST_TS_CONT) {
		/* Ignore seq_step here since vblank waits time out immediately
		 * when we kill the crtc. */
		igt_assert_f(es->current_seq - es->last_seq >= 0,
			     "unexpected %s seq %u, should be >= %u\n",
			     es->name, es->current_seq, es->last_seq);
		igt_assert_f(es->current_seq - es->last_seq <= 100,
			     "unexpected %s seq %u, should be < %u\n",
			     es->name, es->current_seq, es->last_seq + 100);

		igt_debug("testing ts continuity: Current frame %u, old frame %u\n",
			  es->current_seq, es->last_seq);
	}

	if ((o->flags & TEST_CHECK_TS) && (!analog_tv_connector(o))) {
		timersub(&es->current_ts, &es->last_ts, &diff);
		usec_interflip = (double)o->seq_step * frame_time(o);

		igt_assert_f(fabs((((double) diff.tv_usec) - usec_interflip) /
				  usec_interflip) <= 0.005,
			     "inter-%s ts jitter: %is, %ius\n",
			     es->name, (int) diff.tv_sec, (int) diff.tv_usec);

		igt_assert_f(es->current_seq == es->last_seq + o->seq_step,
			     "unexpected %s seq %u, expected %u\n",
			     es->name, es->current_seq,
			     es->last_seq + o->seq_step);
	}
}

static void check_state_correlation(struct test_output *o,
				    struct event_state *es1,
				    struct event_state *es2)
{
	struct timeval tv_diff;
	double ftime;
	double usec_diff;
	int seq_diff;

	if (es1->count == 0 || es2->count == 0)
		return;

	timersub(&es2->current_ts, &es1->current_ts, &tv_diff);
	usec_diff = tv_diff.tv_sec * 1000 * 1000 + tv_diff.tv_usec;

	seq_diff = es2->current_seq - es1->current_seq;
	ftime = frame_time(o);
	usec_diff -= seq_diff * ftime;

	igt_assert_f(fabs(usec_diff) / ftime <= 0.005,
		     "timestamp mismatch between %s and %s (diff %.4f sec)\n",
		     es1->name, es2->name, usec_diff / 1000 / 1000);
}

static void check_all_state(struct test_output *o,
			    unsigned int completed_events)
{
	bool flip, vblank;

	flip = completed_events & EVENT_FLIP;
	vblank = completed_events & EVENT_VBLANK;

	if (flip)
		check_state(o, &o->flip_state);
	if (vblank)
		check_state(o, &o->vblank_state);

	/* FIXME: Correlation check is broken. */
	if (flip && vblank && 0)
		check_state_correlation(o, &o->flip_state, &o->vblank_state);
}

static void recreate_fb(struct test_output *o)
{
	drmModeFBPtr r;
	struct igt_fb *fb_info = &o->fb_info[o->current_fb_id];
	uint32_t new_fb_id;

	/* Call rmfb/getfb/addfb to ensure those don't introduce stalls */
	r = drmModeGetFB(drm_fd, fb_info->fb_id);
	igt_assert(r);

	do_or_die(drmModeAddFB(drm_fd, o->fb_width, o->fb_height, o->depth,
			       o->bpp, fb_info->stride,
			       r->handle, &new_fb_id));

	gem_close(drm_fd, r->handle);
	drmFree(r);
	do_or_die(drmModeRmFB(drm_fd, fb_info->fb_id));

	o->fb_ids[o->current_fb_id] = new_fb_id;
	o->fb_info[o->current_fb_id].fb_id = new_fb_id;
}

static void set_y_tiling(struct test_output *o, int fb_idx)
{
	drmModeFBPtr r;
	struct igt_fb *fb_info = &o->fb_info[fb_idx];

	/* Call rmfb/getfb/addfb to ensure those don't introduce stalls */
	r = drmModeGetFB(drm_fd, fb_info->fb_id);
	igt_assert(r);
	/* Newer kernels don't allow such shenagians any more, so skip the test. */
	igt_require(__gem_set_tiling(drm_fd, r->handle, I915_TILING_Y, fb_info->stride) == 0);
	gem_close(drm_fd, r->handle);
	drmFree(r);
}

static void stop_rings(bool stop)
{
	if (stop)
		igt_set_stop_rings(STOP_RING_DEFAULTS);
	else
		igt_set_stop_rings(STOP_RING_NONE);
}

static void eat_error_state(void)
{
	static const char dfs_base[] = "/sys/kernel/debug/dri";
	static const char dfs_entry_error[] = "i915_error_state";
	static const char data[] = "";
	char fname[FILENAME_MAX];
	int card_index = drm_get_card();
	int fd;

	igt_assert(card_index != -1);

	/* clear the error state */
	snprintf(fname, FILENAME_MAX, "%s/%i/%s",
		 dfs_base, card_index, dfs_entry_error);

	fd = open(fname, O_WRONLY);
	igt_assert(fd >= 0);

	igt_assert(write(fd, data, sizeof(data)) == sizeof(data));
	close(fd);

	/* and check whether stop_rings is not reset, i.e. the hang has indeed
	 * happened */
	igt_assert_f(igt_get_stop_rings() == STOP_RING_NONE,
		     "no gpu hang detected, stop_rings is still 0x%x\n",
		     igt_get_stop_rings());

	close(fd);
}

static void unhang_gpu(int fd, uint32_t handle)
{
	gem_sync(drm_fd, handle);
	gem_close(drm_fd, handle);
	eat_error_state();
	stop_rings(false);
}

static uint32_t hang_gpu(int fd)
{
	struct drm_i915_gem_execbuffer2 execbuf;
	struct drm_i915_gem_exec_object2 gem_exec;
	uint32_t b[2] = {MI_BATCH_BUFFER_END};

	stop_rings(true);

	memset(&gem_exec, 0, sizeof(gem_exec));
	gem_exec.handle = gem_create(fd, 4096);
	gem_write(fd, gem_exec.handle, 0, b, sizeof(b));

	memset(&execbuf, 0, sizeof(execbuf));
	execbuf.buffers_ptr = (uintptr_t)&gem_exec;
	execbuf.buffer_count = 1;
	execbuf.batch_len = sizeof(b);

	if (drmIoctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf)) {
		igt_assert_f(errno == EIO,
			     "failed to exercise page flip hang recovery\n");

		unhang_gpu(fd, gem_exec.handle);
		gem_exec.handle = 0;
	}

	return gem_exec.handle;
}

static bool is_hung(int fd)
{
	if (drmIoctl(fd, DRM_IOCTL_I915_GEM_THROTTLE, 0) == 0)
		return false;

	return errno == EIO;
}

static int set_mode(struct test_output *o, uint32_t fb, int x, int y)
{
	int n;

	for (n = 0; n < o->count; n++) {
		if (fb == 0) {
			int ret = drmModeSetCrtc(drm_fd, o->_crtc[n],
						 0, 0, 0,
						 0, 0, 0);
			if (ret)
				return ret;
		} else {
			int ret = drmModeSetCrtc(drm_fd, o->_crtc[n],
						 fb, x, y,
						 &o->_connector[n], 1, &o->kmode[n]);
			if (ret)
				return ret;
		}
	}

	return 0;
}

/* Return mask of completed events. */
static unsigned int run_test_step(struct test_output *o)
{
	unsigned int new_fb_id;
	/* for funny reasons page_flip returns -EBUSY on disabled crtcs ... */
	int expected_einval = o->flags & TEST_MODESET ? -EBUSY : -EINVAL;
	unsigned int completed_events = 0;
	bool do_flip;
	bool do_vblank;
	struct vblank_reply vbl_reply;
	unsigned int target_seq;
	uint32_t hang = 0;	/* Suppress GCC warning */

	target_seq = o->vblank_state.seq_step;
	/* Absolute waits only works once we have a frame counter. */
	if (o->flags & TEST_VBLANK_ABSOLUTE && o->vblank_state.count > 0)
		target_seq += o->vblank_state.last_seq;

	/*
	 * It's possible that we don't have a pending flip here, in case both
	 * wf-vblank and flip were scheduled and the wf-vblank event was
	 * delivered earlier. The same applies to vblank events w.r.t flip.
	 */
	do_flip = (o->flags & TEST_FLIP) && !(o->pending_events & EVENT_FLIP);
	do_vblank = (o->flags & TEST_VBLANK) &&
		    !(o->pending_events & EVENT_VBLANK);

	if (o->flags & TEST_DPMS_OFF_OTHERS)
		dpms_off_other_outputs(o);

	if (o->flags & TEST_WITH_DUMMY_BCS)
		emit_dummy_load__bcs(o);

	if (o->flags & TEST_WITH_DUMMY_RCS)
		emit_dummy_load__rcs(o);

	if (!(o->flags & TEST_SINGLE_BUFFER))
		o->current_fb_id = !o->current_fb_id;

	if (o->flags & TEST_FB_RECREATE)
		recreate_fb(o);
	new_fb_id = o->fb_ids[o->current_fb_id];

	if (o->flags & TEST_FB_BAD_TILING)
		new_fb_id = o->fb_ids[2];

	if ((o->flags & TEST_VBLANK_EXPIRED_SEQ) &&
	    !(o->pending_events & EVENT_VBLANK) && o->flip_state.count > 0) {
		struct vblank_reply reply;
		unsigned int exp_seq;
		unsigned long start;

		exp_seq = o->flip_state.current_seq;
		start = gettime_us();
		do_or_die(__wait_for_vblank(TEST_VBLANK_ABSOLUTE |
					    TEST_VBLANK_BLOCK, o->pipe, exp_seq,
					    0, &reply));
		igt_assert(gettime_us() - start < 500);
		igt_assert(reply.sequence == exp_seq);
		igt_assert(timercmp(&reply.ts, &o->flip_state.last_ts, ==));
	}

	if (o->flags & TEST_ENOENT) {
		/* hope that fb 0xfffffff0 does not exist */
		igt_assert(do_page_flip(o, 0xfffffff0, false) == -ENOENT);
		igt_assert(set_mode(o, 0xfffffff0, 0, 0) == -ENOENT);
	}

	if (do_flip && (o->flags & TEST_EINVAL) && o->flip_state.count > 0)
		igt_assert(do_page_flip(o, new_fb_id, true) == expected_einval);

	if (o->flags & TEST_FB_BAD_TILING)
		new_fb_id = o->fb_ids[o->current_fb_id];

	if (do_vblank && (o->flags & TEST_EINVAL) && o->vblank_state.count > 0)
		igt_assert(do_wait_for_vblank(o, o->pipe, target_seq, &vbl_reply)
		       == -EINVAL);

	if (o->flags & TEST_VBLANK_RACE) {
		spawn_vblank_wait_thread(o);

		if (o->flags & TEST_MODESET)
			igt_assert_f(set_mode(o, 0 /* no fb */, 0, 0) == 0,
				     "failed to disable output: %s\n",
				     strerror(errno));
	}

	if (o->flags & TEST_DPMS_OFF)
		set_dpms(o, DRM_MODE_DPMS_OFF);

	if (o->flags & TEST_MODESET)
		igt_assert(set_mode(o, o->fb_ids[o->current_fb_id], 0, 0) == 0);

	if (o->flags & TEST_DPMS)
		set_dpms(o, DRM_MODE_DPMS_ON);

	if (o->flags & TEST_VBLANK_RACE) {
		struct vblank_reply reply;
		unsigned long start, end;

		/* modeset/DPMS is done, vblank wait should work normally now */
		start = gettime_us();
		igt_assert(__wait_for_vblank(TEST_VBLANK_BLOCK, o->pipe, 1, 0, &reply) == 0);
		end = gettime_us();
		igt_assert(end - start > 1 * frame_time(o) / 2 &&
			   end - start < 3 * frame_time(o) / 2);
		join_vblank_wait_thread();
	}

	igt_info("."); fflush(stdout);

	if (do_flip && (o->flags & TEST_HANG)) {
		hang = hang_gpu(drm_fd);
		igt_assert_f(hang, "failed to exercise page flip hang recovery\n");
	}

	/* try to make sure we can issue two flips during the same frame */
	if (do_flip && (o->flags & TEST_EBUSY)) {
		struct vblank_reply reply;
		igt_assert(__wait_for_vblank(TEST_VBLANK_BLOCK, o->pipe, 1, 0, &reply) == 0);
	}

	if (do_flip)
		do_or_die(do_page_flip(o, new_fb_id, !(o->flags & TEST_NOEVENT)));

	if (o->flags & TEST_FENCE_STRESS)
		emit_fence_stress(o);

	if (do_vblank) {
		do_or_die(do_wait_for_vblank(o, o->pipe, target_seq,
					     &vbl_reply));
		if (o->flags & TEST_VBLANK_BLOCK) {
			event_handler(&o->vblank_state, vbl_reply.sequence,
				      vbl_reply.ts.tv_sec,
				      vbl_reply.ts.tv_usec);
			completed_events = EVENT_VBLANK;
		}
	}

	if (do_flip && (o->flags & TEST_EBUSY))
		igt_assert(do_page_flip(o, new_fb_id, true) == -EBUSY);

	if (do_flip && (o->flags & TEST_RMFB))
		recreate_fb(o);

	/* pan before the flip completes */
	if (o->flags & TEST_PAN) {
		int count = do_flip ?
			o->flip_state.count : o->vblank_state.count;
		int x_ofs = count * 10 > o->fb_width - o->kmode[0].hdisplay ? o->fb_width - o->kmode[0].hdisplay : count * 10;

		/* Make sure DSPSURF changes value */
		if (o->flags & TEST_HANG)
			o->current_fb_id = !o->current_fb_id;

		igt_assert_f(set_mode(o, o->fb_ids[o->current_fb_id], x_ofs, 0) == 0,
			     "failed to pan (%dx%d@%dHz)+%d: %s\n",
			     o->kmode[0].hdisplay, o->kmode[0].vdisplay, o->kmode[0].vrefresh,
			     x_ofs, strerror(errno));
	}

	if (o->flags & TEST_DPMS)
		set_dpms(o, DRM_MODE_DPMS_OFF);

	if (o->flags & TEST_MODESET && !(o->flags & TEST_RMFB) && !(o->flags & TEST_VBLANK_RACE))
		igt_assert_f(set_mode(o, 0 /* no fb */, 0, 0) == 0,
			     "failed to disable output: %s\n",
			     strerror(errno));

	if (o->flags & TEST_RPM)
		igt_assert(igt_wait_for_pm_status(IGT_RUNTIME_PM_STATUS_SUSPENDED));

	if (o->flags & TEST_SUSPEND)
		igt_system_suspend_autoresume();

	if (do_vblank && (o->flags & TEST_EINVAL) && o->vblank_state.count > 0)
		igt_assert(do_wait_for_vblank(o, o->pipe, target_seq, &vbl_reply)
			   == -EINVAL);

	if (do_flip && (o->flags & TEST_EINVAL) && !(o->flags & TEST_FB_BAD_TILING))
		igt_assert(do_page_flip(o, new_fb_id, true) == expected_einval);

	if (hang)
		unhang_gpu(drm_fd, hang);

	return completed_events;
}

static void update_state(struct event_state *es)
{
	es->last_received_ts = es->current_received_ts;
	es->last_ts = es->current_ts;
	es->last_seq = es->current_seq;
	es->count++;
}

static void update_all_state(struct test_output *o,
			     unsigned int completed_events)
{
	if (completed_events & EVENT_FLIP)
		update_state(&o->flip_state);

	if (completed_events & EVENT_VBLANK)
		update_state(&o->vblank_state);
}

static void connector_find_preferred_mode(uint32_t connector_id, int crtc_idx,
					  struct test_output *o)
{
	struct kmstest_connector_config config;

	if (kmstest_get_connector_config(drm_fd, connector_id, 1 << crtc_idx,
					 &config) < 0) {
		o->mode_valid = 0;
		return;
	}

	o->pipe = config.pipe;
	o->kconnector[0] = config.connector;
	o->kencoder[0] = config.encoder;
	o->_crtc[0] = config.crtc->crtc_id;
	o->kmode[0] = config.default_mode;
	o->mode_valid = 1;

	o->fb_width = o->kmode[0].hdisplay;
	o->fb_height = o->kmode[0].vdisplay;

	drmModeFreeCrtc(config.crtc);
}

static bool mode_compatible(const drmModeModeInfo *a, const drmModeModeInfo *b)
{
	int d_refresh;

	if (a->hdisplay != b->hdisplay)
		return false;

	if (a->vdisplay != b->vdisplay)
		return false;

	d_refresh = a->vrefresh - b->vrefresh;
	if (d_refresh < -1 || d_refresh > 1)
		return false;

	return true;
}

static void connector_find_compatible_mode(int crtc_idx0, int crtc_idx1,
					   struct test_output *o)
{
	struct kmstest_connector_config config[2];
	drmModeModeInfo *mode[2];
	int n, m;

	if (kmstest_get_connector_config(drm_fd, o->_connector[0],
					 1 << crtc_idx0, &config[0]) < 0)
		return;

	if (kmstest_get_connector_config(drm_fd, o->_connector[1],
					 1 << crtc_idx1, &config[1]) < 0) {
		kmstest_free_connector_config(&config[0]);
		return;
	}

	mode[0] = &config[0].default_mode;
	mode[1] = &config[1].default_mode;
	if (!mode_compatible(mode[0], mode[1])) {
		for (n = 0; n < config[0].connector->count_modes; n++) {
			mode[0] = &config[0].connector->modes[n];
			for (m = 0; m < config[1].connector->count_modes; m++) {
				mode[1] = &config[1].connector->modes[m];
				if (mode_compatible(mode[0], mode[1]))
					goto found;
			}
		}

		/* hope for the best! */
		mode[1] = mode[0] = &config[0].default_mode;
	}

found:
	o->pipe = config[0].pipe;
	o->fb_width = mode[0]->hdisplay;
	o->fb_height = mode[0]->vdisplay;
	o->mode_valid = 1;

	o->kconnector[0] = config[0].connector;
	o->kencoder[0] = config[0].encoder;
	o->_crtc[0] = config[0].crtc->crtc_id;
	o->kmode[0] = *mode[0];

	o->kconnector[1] = config[1].connector;
	o->kencoder[1] = config[1].encoder;
	o->_crtc[1] = config[1].crtc->crtc_id;
	o->kmode[1] = *mode[1];

	drmModeFreeCrtc(config[0].crtc);
	drmModeFreeCrtc(config[1].crtc);
}

static void paint_flip_mode(struct igt_fb *fb, bool odd_frame)
{
	cairo_t *cr = igt_get_cairo_ctx(drm_fd, fb);
	int width = fb->width;
	int height = fb->height;

	igt_paint_test_pattern(cr, width, height);

	if (odd_frame)
		cairo_rectangle(cr, width/4, height/2, width/4, height/8);
	else
		cairo_rectangle(cr, width/2, height/2, width/4, height/8);

	cairo_set_source_rgb(cr, 1, 1, 1);
	cairo_fill(cr);

	igt_assert(!cairo_status(cr));
	cairo_destroy(cr);
}

static int
fb_is_bound(struct test_output *o, int fb)
{
	int n;

	for (n = 0; n < o->count; n++) {
		struct drm_mode_crtc mode;

		mode.crtc_id = o->_crtc[n];
		if (drmIoctl(drm_fd, DRM_IOCTL_MODE_GETCRTC, &mode))
			return 0;

		if (!mode.mode_valid || mode.fb_id != fb)
			return false;
	}

	return true;
}

static void check_final_state(struct test_output *o, struct event_state *es,
			      unsigned int elapsed)
{
	igt_assert_f(es->count > 0,
		     "no %s event received\n", es->name);

	/* Verify we drop no frames, but only if it's not a TV encoder, since
	 * those use some funny fake timings behind userspace's back. */
	if (o->flags & TEST_CHECK_TS && !analog_tv_connector(o)) {
		int expected;
		int count = es->count;

		count *= o->seq_step;
		expected = elapsed * o->kmode[0].vrefresh / (1000 * 1000);
		igt_assert_f(count >= expected * 99/100 && count <= expected * 101/100,
			     "dropped frames, expected %d, counted %d, encoder type %d\n",
			     expected, count, o->kencoder[0]->encoder_type);
	}
}

/*
 * Wait until at least one pending event completes. Return mask of completed
 * events.
 */
static unsigned int wait_for_events(struct test_output *o)
{
	drmEventContext evctx;
	struct timeval timeout = { .tv_sec = 3, .tv_usec = 0 };
	fd_set fds;
	unsigned int event_mask;
	int ret;

	event_mask = o->pending_events;
	igt_assert(event_mask);

	memset(&evctx, 0, sizeof evctx);
	evctx.version = DRM_EVENT_CONTEXT_VERSION;
	evctx.vblank_handler = vblank_handler;
	evctx.page_flip_handler = page_flip_handler;

	/* make timeout lax with the dummy load */
	if (o->flags & (TEST_WITH_DUMMY_BCS | TEST_WITH_DUMMY_RCS))
		timeout.tv_sec *= 60;

	FD_ZERO(&fds);
	FD_SET(drm_fd, &fds);
	do {
		do {
			ret = select(drm_fd + 1, &fds, NULL, NULL, &timeout);
		} while (ret < 0 && errno == EINTR);

		igt_assert_f(ret >= 0,
			     "select error (errno %i)\n", errno);
		igt_assert_f(ret > 0,
			     "select timed out or error (ret %d)\n", ret);
		igt_assert_f(!FD_ISSET(0, &fds),
			     "no fds active, breaking\n");

		do_or_die(drmHandleEvent(drm_fd, &evctx));
	} while (o->pending_events);

	event_mask ^= o->pending_events;
	igt_assert(event_mask);

	return event_mask;
}

/* Returned the elapsed time in us */
static unsigned event_loop(struct test_output *o, unsigned duration_ms)
{
	unsigned long start, end;
	uint32_t hang = 0;	/* Suppress GCC warning */
	int count = 0;

	if (o->flags & TEST_HANG_ONCE) {
		hang = hang_gpu(drm_fd);
		igt_assert_f(hang, "failed to exercise page flip hang recovery\n");
	}

	start = gettime_us();

	while (1) {
		unsigned int completed_events;

		completed_events = run_test_step(o);
		if (o->pending_events)
			completed_events |= wait_for_events(o);
		check_all_state(o, completed_events);
		update_all_state(o, completed_events);

		if (count && (gettime_us() - start) / 1000 >= duration_ms)
			break;

		count++;
	}

	end = gettime_us();

	if (hang)
		unhang_gpu(drm_fd, hang);

	/* Flush any remaining events */
	if (o->pending_events)
		wait_for_events(o);

	return end - start;
}

static void free_test_output(struct test_output *o)
{
	int i;

	for (i = 0; i < o->count; i++) {
		drmModeFreeEncoder(o->kencoder[i]);
		drmModeFreeConnector(o->kconnector[i]);
	}
}

static void run_test_on_crtc_set(struct test_output *o, int *crtc_idxs,
				 int crtc_count, int duration_ms)
{
	char test_name[128];
	unsigned elapsed;
	unsigned bo_size = 0;
	bool tiled;
	int i;

	switch (crtc_count) {
	case 1:
		connector_find_preferred_mode(o->_connector[0], crtc_idxs[0], o);
		snprintf(test_name, sizeof(test_name),
			  "%s on crtc %d, connector %d",
			  igt_subtest_name(), o->_crtc[0], o->_connector[0]);
		break;
	case 2:
		connector_find_compatible_mode(crtc_idxs[0], crtc_idxs[1], o);
		snprintf(test_name, sizeof(test_name),
			 "%s on crtc %d:%d, connector %d:%d",
			 igt_subtest_name(), o->_crtc[0], o->_crtc[1],
			 o->_connector[0], o->_connector[1]);
		break;
	default:
		igt_assert(0);
	}
	if (!o->mode_valid)
		return;

	igt_assert(o->count == crtc_count);

	last_connector = o->kconnector[0];

	igt_info("Beginning %s\n", test_name);

	if (o->flags & TEST_PAN)
		o->fb_width *= 2;

	tiled = false;
	if (o->flags & TEST_FENCE_STRESS)
		tiled = true;

	/* 256 MB is usually the maximum mappable aperture,
	 * (make it 4x times that to ensure failure) */
	if (o->flags & TEST_BO_TOOBIG)
		bo_size = 4*256*1024*1024;

	o->fb_ids[0] = igt_create_fb(drm_fd, o->fb_width, o->fb_height,
					 igt_bpp_depth_to_drm_format(o->bpp, o->depth),
					 tiled, &o->fb_info[0]);
	o->fb_ids[1] = igt_create_fb_with_bo_size(drm_fd, o->fb_width, o->fb_height,
					 igt_bpp_depth_to_drm_format(o->bpp, o->depth),
					 tiled, &o->fb_info[1], bo_size);
	o->fb_ids[2] = igt_create_fb(drm_fd, o->fb_width, o->fb_height,
					 igt_bpp_depth_to_drm_format(o->bpp, o->depth),
					 true, &o->fb_info[2]);
	igt_assert(o->fb_ids[0]);
	igt_assert(o->fb_ids[1]);
	if (o->flags & TEST_FB_BAD_TILING)
		igt_require(o->fb_ids[2]);

	paint_flip_mode(&o->fb_info[0], false);
	if (!(o->flags & TEST_BO_TOOBIG))
		paint_flip_mode(&o->fb_info[1], true);
	if (o->fb_ids[2])
		paint_flip_mode(&o->fb_info[2], true);

	if (o->flags & TEST_FB_BAD_TILING)
		set_y_tiling(o, 2);

	for (i = 0; i < o->count; i++)
		kmstest_dump_mode(&o->kmode[i]);

	if (set_mode(o, o->fb_ids[0], 0, 0)) {
		/* We may fail to apply the mode if there are hidden
		 * constraints, such as bandwidth on the third pipe.
		 */
		igt_assert_f(crtc_count > 1 || crtc_idxs[0] < 2,
			     "set_mode may only fail on the 3rd pipe or in multiple crtc tests\n");
		goto out;
	}
	igt_assert(fb_is_bound(o, o->fb_ids[0]));

	/* quiescent the hw a bit so ensure we don't miss a single frame */
	if (o->flags & TEST_CHECK_TS)
		sleep(1);

	if (o->flags & TEST_BO_TOOBIG) {
		igt_assert(do_page_flip(o, o->fb_ids[1], true) == -E2BIG);
		goto out;
	} else
		igt_assert(do_page_flip(o, o->fb_ids[1], true) == 0);
	wait_for_events(o);

	o->current_fb_id = 1;

	if (o->flags & TEST_FLIP)
		o->flip_state.seq_step = 1;
	else
		o->flip_state.seq_step = 0;
	if (o->flags & TEST_VBLANK)
		o->vblank_state.seq_step = 10;
	else
		o->vblank_state.seq_step = 0;

	/* We run the vblank and flip actions in parallel by default. */
	o->seq_step = max(o->vblank_state.seq_step, o->flip_state.seq_step);

	elapsed = event_loop(o, duration_ms);

	if (o->flags & TEST_FLIP && !(o->flags & TEST_NOEVENT))
		check_final_state(o, &o->flip_state, elapsed);
	if (o->flags & TEST_VBLANK)
		check_final_state(o, &o->vblank_state, elapsed);

	igt_info("\n%s: PASSED\n\n", test_name);

out:
	if (o->fb_ids[2])
		igt_remove_fb(drm_fd, &o->fb_info[2]);
	igt_remove_fb(drm_fd, &o->fb_info[1]);
	igt_remove_fb(drm_fd, &o->fb_info[0]);

	last_connector = NULL;

	free_test_output(o);
}

static int run_test(int duration, int flags)
{
	struct test_output o;
	int i, n, modes = 0;

	igt_require((flags & TEST_HANG) == 0 || !is_hung(drm_fd));

	if (flags & TEST_RPM)
		igt_require(igt_setup_runtime_pm());

	resources = drmModeGetResources(drm_fd);
	igt_assert(resources);

	/* Count output configurations to scale test runtime. */
	for (i = 0; i < resources->count_connectors; i++) {
		for (n = 0; n < resources->count_crtcs; n++) {
			memset(&o, 0, sizeof(o));
			o.count = 1;
			o._connector[0] = resources->connectors[i];
			o.flags = flags;
			o.flip_state.name = "flip";
			o.vblank_state.name = "vblank";
			o.bpp = 32;
			o.depth = 24;

			connector_find_preferred_mode(o._connector[0], n, &o);
			if (o.mode_valid)
				modes++;

			free_test_output(&o);
		}
	}

	igt_require(modes);
	duration = duration * 1000 / modes;
	duration = duration < 500 ? 500 : duration;

	/* Find any connected displays */
	for (i = 0; i < resources->count_connectors; i++) {
		for (n = 0; n < resources->count_crtcs; n++) {
			int crtc_idx;

			memset(&o, 0, sizeof(o));
			o.count = 1;
			o._connector[0] = resources->connectors[i];
			o.flags = flags;
			o.flip_state.name = "flip";
			o.vblank_state.name = "vblank";
			o.bpp = 32;
			o.depth = 24;

			crtc_idx = n;
			run_test_on_crtc_set(&o, &crtc_idx, 1, duration);
		}
	}

	drmModeFreeResources(resources);
	return 1;
}

static int run_pair(int duration, int flags)
{
	struct test_output o;
	int i, j, m, n, modes = 0;

	igt_require((flags & TEST_HANG) == 0 || !is_hung(drm_fd));

	resources = drmModeGetResources(drm_fd);
	igt_assert(resources);

	/* Find a pair of connected displays */
	for (i = 0; i < resources->count_connectors; i++) {
		for (n = 0; n < resources->count_crtcs; n++) {
			for (j = i + 1; j < resources->count_connectors; j++) {
				for (m = n + 1; m < resources->count_crtcs; m++) {
					memset(&o, 0, sizeof(o));
					o.count = 2;
					o._connector[0] = resources->connectors[i];
					o._connector[1] = resources->connectors[j];
					o.flags = flags;
					o.flip_state.name = "flip";
					o.vblank_state.name = "vblank";
					o.bpp = 32;
					o.depth = 24;

					connector_find_compatible_mode(n, m, &o);
					if (o.mode_valid)
						modes++;

					free_test_output(&o);
				}
			}
		}
	}

	/* If we have fewer than 2 connected outputs then we won't have any
	 * configuration at all. So skip in that case. */
	igt_require(modes);
	duration = duration * 1000 / modes;
	duration = duration < 500 ? 500 : duration;

	/* Find a pair of connected displays */
	for (i = 0; i < resources->count_connectors; i++) {
		for (n = 0; n < resources->count_crtcs; n++) {
			for (j = i + 1; j < resources->count_connectors; j++) {
				for (m = n + 1; m < resources->count_crtcs; m++) {
					int crtc_idxs[2];

					memset(&o, 0, sizeof(o));
					o.count = 2;
					o._connector[0] = resources->connectors[i];
					o._connector[1] = resources->connectors[j];
					o.flags = flags;
					o.flip_state.name = "flip";
					o.vblank_state.name = "vblank";
					o.bpp = 32;
					o.depth = 24;

					crtc_idxs[0] = n;
					crtc_idxs[1] = m;

					run_test_on_crtc_set(&o, crtc_idxs, 2,
							     duration);
				}
			}
		}
	}

	drmModeFreeResources(resources);
	return 1;
}

static void get_timestamp_format(void)
{
	uint64_t cap_mono;
	int ret;

	ret = drmGetCap(drm_fd, DRM_CAP_TIMESTAMP_MONOTONIC, &cap_mono);
	igt_assert(ret == 0 || errno == EINVAL);
	monotonic_timestamp = ret == 0 && cap_mono == 1;
	igt_info("Using %s timestamps\n",
		 monotonic_timestamp ? "monotonic" : "real");
}

static void kms_flip_exit_handler(int sig)
{
	igt_fixture {
		if (last_connector)
			kmstest_set_connector_dpms(drm_fd, last_connector, DRM_MODE_DPMS_ON);
	}
}

int main(int argc, char **argv)
{
	struct {
		int duration;
		int flags;
		const char *name;
	} tests[] = {
		{ 30, TEST_VBLANK, "wf_vblank" },
		{ 30, TEST_VBLANK | TEST_CHECK_TS, "wf_vblank-ts-check" },
		{ 30, TEST_VBLANK | TEST_VBLANK_BLOCK | TEST_CHECK_TS,
					"blocking-wf_vblank" },
		{ 30,  TEST_VBLANK | TEST_VBLANK_ABSOLUTE,
					"absolute-wf_vblank" },
		{ 30,  TEST_VBLANK | TEST_VBLANK_BLOCK | TEST_VBLANK_ABSOLUTE,
					"blocking-absolute-wf_vblank" },
		{ 60,  TEST_VBLANK | TEST_DPMS | TEST_EINVAL, "wf_vblank-vs-dpms" },
		{ 60,  TEST_VBLANK | TEST_DPMS | TEST_WITH_DUMMY_BCS,
					"bcs-wf_vblank-vs-dpms" },
		{ 60,  TEST_VBLANK | TEST_DPMS | TEST_WITH_DUMMY_RCS,
					"rcs-wf_vblank-vs-dpms" },
		{ 60,  TEST_VBLANK | TEST_MODESET | TEST_EINVAL, "wf_vblank-vs-modeset" },
		{ 60,  TEST_VBLANK | TEST_MODESET | TEST_WITH_DUMMY_BCS,
					"bcs-wf_vblank-vs-modeset" },
		{ 60,  TEST_VBLANK | TEST_MODESET | TEST_WITH_DUMMY_RCS,
					"rcs-wf_vblank-vs-modeset" },

		{ 30, TEST_FLIP , "plain-flip" },
		{ 30, TEST_FLIP | TEST_EBUSY , "busy-flip" },
		{ 30, TEST_FLIP | TEST_FENCE_STRESS , "flip-vs-fences" },
		{ 30, TEST_FLIP | TEST_CHECK_TS, "plain-flip-ts-check" },
		{ 30, TEST_FLIP | TEST_CHECK_TS | TEST_FB_RECREATE,
			"plain-flip-fb-recreate" },
		{ 30, TEST_FLIP | TEST_RMFB | TEST_MODESET , "flip-vs-rmfb" },
		{ 60, TEST_FLIP | TEST_DPMS | TEST_EINVAL, "flip-vs-dpms" },
		{ 60, TEST_FLIP | TEST_DPMS | TEST_WITH_DUMMY_BCS, "bcs-flip-vs-dpms" },
		{ 60, TEST_FLIP | TEST_DPMS | TEST_WITH_DUMMY_RCS, "rcs-flip-vs-dpms" },
		{ 30,  TEST_FLIP | TEST_PAN, "flip-vs-panning" },
		{ 60, TEST_FLIP | TEST_PAN | TEST_WITH_DUMMY_BCS, "bcs-flip-vs-panning" },
		{ 60, TEST_FLIP | TEST_PAN | TEST_WITH_DUMMY_RCS, "rcs-flip-vs-panning" },
		{ 60, TEST_FLIP | TEST_MODESET | TEST_EINVAL, "flip-vs-modeset" },
		{ 60, TEST_FLIP | TEST_MODESET | TEST_WITH_DUMMY_BCS, "bcs-flip-vs-modeset" },
		{ 60, TEST_FLIP | TEST_MODESET | TEST_WITH_DUMMY_RCS, "rcs-flip-vs-modeset" },
		{ 30,  TEST_FLIP | TEST_VBLANK_EXPIRED_SEQ,
					"flip-vs-expired-vblank" },

		{ 30, TEST_FLIP | TEST_VBLANK | TEST_VBLANK_ABSOLUTE |
		      TEST_CHECK_TS, "flip-vs-absolute-wf_vblank" },
		{ 30, TEST_FLIP | TEST_VBLANK | TEST_CHECK_TS,
					"flip-vs-wf_vblank" },
		{ 30, TEST_FLIP | TEST_VBLANK | TEST_VBLANK_BLOCK |
			TEST_CHECK_TS, "flip-vs-blocking-wf-vblank" },
		{ 30, TEST_FLIP | TEST_MODESET | TEST_HANG | TEST_NOEVENT, "flip-vs-modeset-vs-hang" },
		{ 30, TEST_FLIP | TEST_PAN | TEST_HANG, "flip-vs-panning-vs-hang" },
		{ 30, TEST_VBLANK | TEST_HANG_ONCE, "vblank-vs-hang" },
		{ 1, TEST_FLIP | TEST_EINVAL | TEST_FB_BAD_TILING, "flip-vs-bad-tiling" },

		{ 1, TEST_DPMS_OFF | TEST_MODESET | TEST_FLIP,
					"flip-vs-dpms-off-vs-modeset" },
		{ 1, TEST_DPMS_OFF | TEST_MODESET | TEST_FLIP | TEST_SINGLE_BUFFER,
					"single-buffer-flip-vs-dpms-off-vs-modeset" },
		{ 30, TEST_FLIP | TEST_NO_2X_OUTPUT | TEST_DPMS_OFF_OTHERS , "dpms-off-confusion" },
		{ 0, TEST_ENOENT | TEST_NOEVENT, "nonexisting-fb" },
		{ 10, TEST_DPMS_OFF | TEST_DPMS | TEST_VBLANK_RACE, "dpms-vs-vblank-race" },
		{ 10, TEST_MODESET | TEST_VBLANK_RACE, "modeset-vs-vblank-race" },
		{ 10, TEST_VBLANK | TEST_DPMS | TEST_RPM | TEST_TS_CONT, "vblank-vs-dpms-rpm" },
		{ 10, TEST_VBLANK | TEST_MODESET | TEST_RPM | TEST_TS_CONT, "vblank-vs-modeset-rpm" },
		{ 0, TEST_VBLANK | TEST_DPMS | TEST_SUSPEND | TEST_TS_CONT, "vblank-vs-dpms-suspend" },
		{ 0, TEST_VBLANK | TEST_MODESET | TEST_SUSPEND | TEST_TS_CONT, "vblank-vs-modeset-suspend" },
		{ 0, TEST_VBLANK | TEST_SUSPEND | TEST_TS_CONT, "vblank-vs-suspend" },
		{ 0, TEST_BO_TOOBIG | TEST_NO_2X_OUTPUT, "bo-too-big" },
	};
	int i;

	igt_subtest_init(argc, argv);
	igt_skip_on_simulation();

	igt_fixture {
		drm_fd = drm_open_any();

		igt_enable_connectors();

		kmstest_set_vt_graphics_mode();
		igt_install_exit_handler(kms_flip_exit_handler);
		get_timestamp_format();

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

	for (i = 0; i < sizeof(tests) / sizeof (tests[0]); i++) {
		igt_subtest(tests[i].name)
			run_test(tests[i].duration, tests[i].flags);

		if (tests[i].flags & TEST_NO_2X_OUTPUT)
			continue;

		/* code doesn't disable all crtcs, so skip rpm tests */
		if (tests[i].flags & TEST_RPM)
			continue;

		igt_subtest_f( "2x-%s", tests[i].name)
			run_pair(tests[i].duration, tests[i].flags);
	}

	igt_fork_signal_helper();
	for (i = 0; i < sizeof(tests) / sizeof (tests[0]); i++) {
		/* relative blocking vblank waits that get constantly interrupt
		 * take forver. So don't do them. */
		if ((tests[i].flags & TEST_VBLANK_BLOCK) &&
		    !(tests[i].flags & TEST_VBLANK_ABSOLUTE))
			continue;

		igt_subtest_f( "%s-interruptible", tests[i].name)
			run_test(tests[i].duration, tests[i].flags);

		if (tests[i].flags & TEST_NO_2X_OUTPUT)
			continue;

		/* code doesn't disable all crtcs, so skip rpm tests */
		if (tests[i].flags & TEST_RPM)
			continue;

		igt_subtest_f( "2x-%s-interruptible", tests[i].name)
			run_pair(tests[i].duration, tests[i].flags);
	}
	igt_stop_signal_helper();

	/*
	 * Let drm_fd leak, since it's needed by the dpms restore
	 * exit_handler and igt_exit() won't return.
	 */

	igt_exit();
}