Prepare for 64bit relocation addresses

[platform/upstream/intel-gpu-tools.git] / 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);
                OUT_BATCH(0 << 16 | 0);
                OUT_BATCH(pitch);
                OUT_RELOC_FENCED(target_bo, I915_GEM_DOMAIN_RENDER, 0, 0);
                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,
                                                 "X 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)) {
                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]))
                return;

        if (!kmstest_get_connector_config(drm_fd, o->_connector[1],
                                          1 << crtc_idx1, &config[1])) {
                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;
        unsigned int tiling;
        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;

        tiling = I915_TILING_NONE;
        if (o->flags & TEST_FENCE_STRESS)
                tiling = I915_TILING_X;

        /* 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),
                                         tiling, &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),
                                         tiling, &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),
                                         I915_TILING_X, &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();
}