/*
 * Copyright (C) 2013-2015 ARM Limited. All rights reserved.
 * 
 * This program is free software and is provided to you under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
 * 
 * A copy of the licence is included with the program, and can also be obtained from Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include "mali_timeline.h"
#include "mali_kernel_common.h"
#include "mali_scheduler.h"
#include "mali_soft_job.h"
#include "mali_timeline_fence_wait.h"
#include "mali_timeline_sync_fence.h"
#include "mali_executor.h"
#include "mali_pp_job.h"

#define MALI_TIMELINE_SYSTEM_LOCKED(system) (mali_spinlock_reentrant_is_held((system)->spinlock, _mali_osk_get_tid()))

/*
 * Following three elements are used to record how many
 * gp, physical pp or virtual pp jobs are delayed in the whole
 * timeline system, we can use these three value to decide
 * if need to deactivate idle group.
 */
_mali_osk_atomic_t gp_tracker_count;
_mali_osk_atomic_t phy_pp_tracker_count;
_mali_osk_atomic_t virt_pp_tracker_count;

static mali_scheduler_mask mali_timeline_system_release_waiter(struct mali_timeline_system *system,
                struct mali_timeline_waiter *waiter);

#if defined(CONFIG_SYNC)
#include <linux/version.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,5,0)
#include <linux/list.h>
#include <linux/workqueue.h>
#include <linux/spinlock.h>

struct mali_deferred_fence_put_entry {
        struct hlist_node list;
        struct sync_fence *fence;
};

static HLIST_HEAD(mali_timeline_sync_fence_to_free_list);
static DEFINE_SPINLOCK(mali_timeline_sync_fence_to_free_lock);

static void put_sync_fences(struct work_struct *ignore)
{
        struct hlist_head list;
        struct hlist_node *tmp, *pos;
        unsigned long flags;
        struct mali_deferred_fence_put_entry *o;

        spin_lock_irqsave(&mali_timeline_sync_fence_to_free_lock, flags);
        hlist_move_list(&mali_timeline_sync_fence_to_free_list, &list);
        spin_unlock_irqrestore(&mali_timeline_sync_fence_to_free_lock, flags);

        hlist_for_each_entry_safe(o, pos, tmp, &list, list) {
                sync_fence_put(o->fence);
                kfree(o);
        }
}

static DECLARE_DELAYED_WORK(delayed_sync_fence_put, put_sync_fences);
#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,5,0) */

/* Callback that is called when a sync fence a tracker is waiting on is signaled. */
static void mali_timeline_sync_fence_callback(struct sync_fence *sync_fence, struct sync_fence_waiter *sync_fence_waiter)
{
        struct mali_timeline_system  *system;
        struct mali_timeline_waiter  *waiter;
        struct mali_timeline_tracker *tracker;
        mali_scheduler_mask schedule_mask = MALI_SCHEDULER_MASK_EMPTY;
        u32 tid = _mali_osk_get_tid();
        mali_bool is_aborting = MALI_FALSE;
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 17, 0)
        int fence_status = sync_fence->status;
#else
        int fence_status = atomic_read(&sync_fence->status);
#endif

        MALI_DEBUG_ASSERT_POINTER(sync_fence);
        MALI_DEBUG_ASSERT_POINTER(sync_fence_waiter);

        tracker = _MALI_OSK_CONTAINER_OF(sync_fence_waiter, struct mali_timeline_tracker, sync_fence_waiter);
        MALI_DEBUG_ASSERT_POINTER(tracker);

        system = tracker->system;
        MALI_DEBUG_ASSERT_POINTER(system);
        MALI_DEBUG_ASSERT_POINTER(system->session);

        mali_spinlock_reentrant_wait(system->spinlock, tid);

        is_aborting = system->session->is_aborting;
        if (!is_aborting && (0 > fence_status)) {
                MALI_PRINT_ERROR(("Mali Timeline: sync fence fd %d signaled with error %d\n", tracker->fence.sync_fd, fence_status));
                tracker->activation_error |= MALI_TIMELINE_ACTIVATION_ERROR_SYNC_BIT;
        }

        waiter = tracker->waiter_sync;
        MALI_DEBUG_ASSERT_POINTER(waiter);

        tracker->sync_fence = NULL;
        tracker->fence.sync_fd = -1;

        schedule_mask |= mali_timeline_system_release_waiter(system, waiter);

        /* If aborting, wake up sleepers that are waiting for sync fence callbacks to complete. */
        if (is_aborting) {
                _mali_osk_wait_queue_wake_up(system->wait_queue);
        }

        mali_spinlock_reentrant_signal(system->spinlock, tid);

        /*
         * Older versions of Linux, before 3.5, doesn't support fput() in interrupt
         * context. For those older kernels, allocate a list object and put the
         * fence object on that and defer the call to sync_fence_put() to a workqueue.
         */
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,5,0)
        {
                struct mali_deferred_fence_put_entry *obj;

                obj = kzalloc(sizeof(struct mali_deferred_fence_put_entry), GFP_ATOMIC);
                if (obj) {
                        unsigned long flags;
                        mali_bool schedule = MALI_FALSE;

                        obj->fence = sync_fence;

                        spin_lock_irqsave(&mali_timeline_sync_fence_to_free_lock, flags);
                        if (hlist_empty(&mali_timeline_sync_fence_to_free_list))
                                schedule = MALI_TRUE;
                        hlist_add_head(&obj->list, &mali_timeline_sync_fence_to_free_list);
                        spin_unlock_irqrestore(&mali_timeline_sync_fence_to_free_lock, flags);

                        if (schedule)
                                schedule_delayed_work(&delayed_sync_fence_put, 0);
                }
        }
#else
        sync_fence_put(sync_fence);
#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,5,0) */

        if (!is_aborting) {
                mali_executor_schedule_from_mask(schedule_mask, MALI_TRUE);
        }
}
#endif /* defined(CONFIG_SYNC) */

static mali_scheduler_mask mali_timeline_tracker_time_out(struct mali_timeline_tracker *tracker)
{
        MALI_DEBUG_ASSERT_POINTER(tracker);
        MALI_DEBUG_ASSERT(MALI_TIMELINE_TRACKER_SOFT == tracker->type);

        return mali_soft_job_system_timeout_job((struct mali_soft_job *) tracker->job);
}

static void mali_timeline_timer_callback(void *data)
{
        struct mali_timeline_system *system;
        struct mali_timeline_tracker *tracker;
        struct mali_timeline *timeline;
        mali_scheduler_mask schedule_mask = MALI_SCHEDULER_MASK_EMPTY;
        u32 tid = _mali_osk_get_tid();

        timeline = (struct mali_timeline *) data;
        MALI_DEBUG_ASSERT_POINTER(timeline);

        system = timeline->system;
        MALI_DEBUG_ASSERT_POINTER(system);

        mali_spinlock_reentrant_wait(system->spinlock, tid);

        if (!system->timer_enabled) {
                mali_spinlock_reentrant_signal(system->spinlock, tid);
                return;
        }

        tracker = timeline->tracker_tail;
        timeline->timer_active = MALI_FALSE;

        if (NULL != tracker && MALI_TRUE == tracker->timer_active) {
                /* This is likely the delayed work that has been schedule out before cancelled. */
                if (MALI_TIMELINE_TIMEOUT_HZ > (_mali_osk_time_tickcount() - tracker->os_tick_activate)) {
                        mali_spinlock_reentrant_signal(system->spinlock, tid);
                        return;
                }

                schedule_mask = mali_timeline_tracker_time_out(tracker);
                tracker->timer_active = MALI_FALSE;
        } else {
                MALI_PRINT_ERROR(("Mali Timeline: Soft job timer callback without a waiting tracker.\n"));
        }

        mali_spinlock_reentrant_signal(system->spinlock, tid);

        mali_executor_schedule_from_mask(schedule_mask, MALI_FALSE);
}

void mali_timeline_system_stop_timer(struct mali_timeline_system *system)
{
        u32 i;
        u32 tid = _mali_osk_get_tid();

        MALI_DEBUG_ASSERT_POINTER(system);

        mali_spinlock_reentrant_wait(system->spinlock, tid);
        system->timer_enabled = MALI_FALSE;
        mali_spinlock_reentrant_signal(system->spinlock, tid);

        for (i = 0; i < MALI_TIMELINE_MAX; ++i) {
                struct mali_timeline *timeline = system->timelines[i];

                MALI_DEBUG_ASSERT_POINTER(timeline);

                if (NULL != timeline->delayed_work) {
                        _mali_osk_wq_delayed_cancel_work_sync(timeline->delayed_work);
                        timeline->timer_active = MALI_FALSE;
                }
        }
}

static void mali_timeline_destroy(struct mali_timeline *timeline)
{
        MALI_DEBUG_ASSERT_POINTER(timeline);
        if (NULL != timeline) {
                /* Assert that the timeline object has been properly cleaned up before destroying it. */
                MALI_DEBUG_ASSERT(timeline->point_oldest == timeline->point_next);
                MALI_DEBUG_ASSERT(NULL == timeline->tracker_head);
                MALI_DEBUG_ASSERT(NULL == timeline->tracker_tail);
                MALI_DEBUG_ASSERT(NULL == timeline->waiter_head);
                MALI_DEBUG_ASSERT(NULL == timeline->waiter_tail);
                MALI_DEBUG_ASSERT(NULL != timeline->system);
                MALI_DEBUG_ASSERT(MALI_TIMELINE_MAX > timeline->id);

#if defined(CONFIG_SYNC)
                if (NULL != timeline->sync_tl) {
                        sync_timeline_destroy(timeline->sync_tl);
                }
#endif /* defined(CONFIG_SYNC) */

                if (NULL != timeline->delayed_work) {
                        _mali_osk_wq_delayed_cancel_work_sync(timeline->delayed_work);
                        _mali_osk_wq_delayed_delete_work_nonflush(timeline->delayed_work);
                }

                _mali_osk_free(timeline);
        }
}

static struct mali_timeline *mali_timeline_create(struct mali_timeline_system *system, enum mali_timeline_id id)
{
        struct mali_timeline *timeline;

        MALI_DEBUG_ASSERT_POINTER(system);
        MALI_DEBUG_ASSERT(id < MALI_TIMELINE_MAX);

        timeline = (struct mali_timeline *) _mali_osk_calloc(1, sizeof(struct mali_timeline));
        if (NULL == timeline) {
                return NULL;
        }

        /* Initially the timeline is empty. */
#if defined(MALI_TIMELINE_DEBUG_START_POINT)
        /* Start the timeline a bit before wrapping when debugging. */
        timeline->point_next = UINT_MAX - MALI_TIMELINE_MAX_POINT_SPAN - 128;
#else
        timeline->point_next = 1;
#endif
        timeline->point_oldest = timeline->point_next;

        /* The tracker and waiter lists will initially be empty. */

        timeline->system = system;
        timeline->id = id;

        timeline->delayed_work = _mali_osk_wq_delayed_create_work(mali_timeline_timer_callback, timeline);
        if (NULL == timeline->delayed_work) {
                mali_timeline_destroy(timeline);
                return NULL;
        }

        timeline->timer_active = MALI_FALSE;

#if defined(CONFIG_SYNC)
        {
                char timeline_name[32];

                switch (id) {
                case MALI_TIMELINE_GP:
                        _mali_osk_snprintf(timeline_name, 32, "mali-%u-gp", _mali_osk_get_pid());
                        break;
                case MALI_TIMELINE_PP:
                        _mali_osk_snprintf(timeline_name, 32, "mali-%u-pp", _mali_osk_get_pid());
                        break;
                case MALI_TIMELINE_SOFT:
                        _mali_osk_snprintf(timeline_name, 32, "mali-%u-soft", _mali_osk_get_pid());
                        break;
                default:
                        MALI_PRINT_ERROR(("Mali Timeline: Invalid timeline id %d\n", id));
                        mali_timeline_destroy(timeline);
                        return NULL;
                }

                timeline->sync_tl = mali_sync_timeline_create(timeline, timeline_name);
                if (NULL == timeline->sync_tl) {
                        mali_timeline_destroy(timeline);
                        return NULL;
                }
        }
#endif /* defined(CONFIG_SYNC) */

        return timeline;
}

static void mali_timeline_insert_tracker(struct mali_timeline *timeline, struct mali_timeline_tracker *tracker)
{
        MALI_DEBUG_ASSERT_POINTER(timeline);
        MALI_DEBUG_ASSERT_POINTER(tracker);

        if (mali_timeline_is_full(timeline)) {
                /* Don't add tracker if timeline is full. */
                tracker->point = MALI_TIMELINE_NO_POINT;
                return;
        }

        tracker->timeline = timeline;
        tracker->point    = timeline->point_next;

        /* Find next available point. */
        timeline->point_next++;
        if (MALI_TIMELINE_NO_POINT == timeline->point_next) {
                timeline->point_next++;
        }

        MALI_DEBUG_ASSERT(!mali_timeline_is_empty(timeline));

        if (MALI_TIMELINE_TRACKER_GP == tracker->type) {
                _mali_osk_atomic_inc(&gp_tracker_count);
        } else if (MALI_TIMELINE_TRACKER_PP == tracker->type) {
                if (mali_pp_job_is_virtual((struct mali_pp_job *)tracker->job)) {
                        _mali_osk_atomic_inc(&virt_pp_tracker_count);
                } else {
                        _mali_osk_atomic_inc(&phy_pp_tracker_count);
                }
        }

        /* Add tracker as new head on timeline's tracker list. */
        if (NULL == timeline->tracker_head) {
                /* Tracker list is empty. */
                MALI_DEBUG_ASSERT(NULL == timeline->tracker_tail);

                timeline->tracker_tail = tracker;

                MALI_DEBUG_ASSERT(NULL == tracker->timeline_next);
                MALI_DEBUG_ASSERT(NULL == tracker->timeline_prev);
        } else {
                MALI_DEBUG_ASSERT(NULL == timeline->tracker_head->timeline_next);

                tracker->timeline_prev = timeline->tracker_head;
                timeline->tracker_head->timeline_next = tracker;

                MALI_DEBUG_ASSERT(NULL == tracker->timeline_next);
        }
        timeline->tracker_head = tracker;

        MALI_DEBUG_ASSERT(NULL == timeline->tracker_head->timeline_next);
        MALI_DEBUG_ASSERT(NULL == timeline->tracker_tail->timeline_prev);
}

/* Inserting the waiter object into the given timeline */
static void mali_timeline_insert_waiter(struct mali_timeline *timeline, struct mali_timeline_waiter *waiter_new)
{
        struct mali_timeline_waiter *waiter_prev;
        struct mali_timeline_waiter *waiter_next;

        /* Waiter time must be between timeline head and tail, and there must
         * be less than MALI_TIMELINE_MAX_POINT_SPAN elements between */
        MALI_DEBUG_ASSERT((waiter_new->point - timeline->point_oldest) < MALI_TIMELINE_MAX_POINT_SPAN);
        MALI_DEBUG_ASSERT((-waiter_new->point + timeline->point_next) < MALI_TIMELINE_MAX_POINT_SPAN);

        /* Finding out where to put this waiter, in the linked waiter list of the given timeline **/
        waiter_prev = timeline->waiter_head; /* Insert new after  waiter_prev */
        waiter_next = NULL;                  /* Insert new before waiter_next */

        /* Iterating backwards from head (newest) to tail (oldest) until we
         * find the correct spot to insert the new waiter */
        while (waiter_prev && mali_timeline_point_after(waiter_prev->point, waiter_new->point)) {
                waiter_next = waiter_prev;
                waiter_prev = waiter_prev->timeline_prev;
        }

        if (NULL == waiter_prev && NULL == waiter_next) {
                /* list is empty */
                timeline->waiter_head = waiter_new;
                timeline->waiter_tail = waiter_new;
        } else if (NULL == waiter_next) {
                /* insert at head */
                waiter_new->timeline_prev = timeline->waiter_head;
                timeline->waiter_head->timeline_next = waiter_new;
                timeline->waiter_head = waiter_new;
        } else if (NULL == waiter_prev) {
                /* insert at tail */
                waiter_new->timeline_next = timeline->waiter_tail;
                timeline->waiter_tail->timeline_prev = waiter_new;
                timeline->waiter_tail = waiter_new;
        } else {
                /* insert between */
                waiter_new->timeline_next = waiter_next;
                waiter_new->timeline_prev = waiter_prev;
                waiter_next->timeline_prev = waiter_new;
                waiter_prev->timeline_next = waiter_new;
        }
}

static void mali_timeline_update_delayed_work(struct mali_timeline *timeline)
{
        struct mali_timeline_system *system;
        struct mali_timeline_tracker *oldest_tracker;

        MALI_DEBUG_ASSERT_POINTER(timeline);
        MALI_DEBUG_ASSERT(MALI_TIMELINE_SOFT == timeline->id);

        system = timeline->system;
        MALI_DEBUG_ASSERT_POINTER(system);

        MALI_DEBUG_ASSERT(MALI_TIMELINE_SYSTEM_LOCKED(system));

        /* Timer is disabled, early out. */
        if (!system->timer_enabled) return;

        oldest_tracker = timeline->tracker_tail;
        if (NULL != oldest_tracker && 0 == oldest_tracker->trigger_ref_count) {
                if (MALI_FALSE == oldest_tracker->timer_active) {
                        if (MALI_TRUE == timeline->timer_active) {
                                _mali_osk_wq_delayed_cancel_work_async(timeline->delayed_work);
                        }
                        _mali_osk_wq_delayed_schedule_work(timeline->delayed_work, MALI_TIMELINE_TIMEOUT_HZ);
                        oldest_tracker->timer_active = MALI_TRUE;
                        timeline->timer_active = MALI_TRUE;
                }
        } else if (MALI_TRUE == timeline->timer_active) {
                _mali_osk_wq_delayed_cancel_work_async(timeline->delayed_work);
                timeline->timer_active = MALI_FALSE;
        }
}

static mali_scheduler_mask mali_timeline_update_oldest_point(struct mali_timeline *timeline)
{
        mali_scheduler_mask schedule_mask = MALI_SCHEDULER_MASK_EMPTY;

        MALI_DEBUG_ASSERT_POINTER(timeline);

        MALI_DEBUG_CODE({
                struct mali_timeline_system *system = timeline->system;
                MALI_DEBUG_ASSERT_POINTER(system);

                MALI_DEBUG_ASSERT(MALI_TIMELINE_SYSTEM_LOCKED(system));
        });

        if (NULL != timeline->tracker_tail) {
                /* Set oldest point to oldest tracker's point */
                timeline->point_oldest = timeline->tracker_tail->point;
        } else {
                /* No trackers, mark point list as empty */
                timeline->point_oldest = timeline->point_next;
        }

        /* Release all waiters no longer on the timeline's point list.
         * Releasing a waiter can trigger this function to be called again, so
         * we do not store any pointers on stack. */
        while (NULL != timeline->waiter_tail) {
                u32 waiter_time_relative;
                u32 time_head_relative;
                struct mali_timeline_waiter *waiter = timeline->waiter_tail;

                time_head_relative = timeline->point_next - timeline->point_oldest;
                waiter_time_relative = waiter->point - timeline->point_oldest;

                if (waiter_time_relative < time_head_relative) {
                        /* This and all following waiters are on the point list, so we are done. */
                        break;
                }

                /* Remove waiter from timeline's waiter list. */
                if (NULL != waiter->timeline_next) {
                        waiter->timeline_next->timeline_prev = NULL;
                } else {
                        /* This was the last waiter */
                        timeline->waiter_head = NULL;
                }
                timeline->waiter_tail = waiter->timeline_next;

                /* Release waiter.  This could activate a tracker, if this was
                 * the last waiter for the tracker. */
                schedule_mask |= mali_timeline_system_release_waiter(timeline->system, waiter);
        }

        return schedule_mask;
}

void mali_timeline_tracker_init(struct mali_timeline_tracker *tracker,
                                mali_timeline_tracker_type type,
                                struct mali_timeline_fence *fence,
                                void *job)
{
        MALI_DEBUG_ASSERT_POINTER(tracker);
        MALI_DEBUG_ASSERT_POINTER(job);

        MALI_DEBUG_ASSERT(MALI_TIMELINE_TRACKER_MAX > type);

        /* Zero out all tracker members. */
        _mali_osk_memset(tracker, 0, sizeof(*tracker));

        tracker->type = type;
        tracker->job = job;
        tracker->trigger_ref_count = 1;  /* Prevents any callback from trigging while adding it */
        tracker->os_tick_create = _mali_osk_time_tickcount();
        MALI_DEBUG_CODE(tracker->magic = MALI_TIMELINE_TRACKER_MAGIC);

        tracker->activation_error = MALI_TIMELINE_ACTIVATION_ERROR_NONE;

        /* Copy fence. */
        if (NULL != fence) {
                _mali_osk_memcpy(&tracker->fence, fence, sizeof(struct mali_timeline_fence));
        }
}

mali_scheduler_mask mali_timeline_tracker_release(struct mali_timeline_tracker *tracker)
{
        struct mali_timeline *timeline;
        struct mali_timeline_system *system;
        struct mali_timeline_tracker *tracker_next, *tracker_prev;
        mali_scheduler_mask schedule_mask = MALI_SCHEDULER_MASK_EMPTY;
        u32 tid = _mali_osk_get_tid();

        /* Upon entry a group lock will be held, but not a scheduler lock. */
        MALI_DEBUG_ASSERT_POINTER(tracker);
        MALI_DEBUG_ASSERT(MALI_TIMELINE_TRACKER_MAGIC == tracker->magic);

        /* Tracker should have been triggered */
        MALI_DEBUG_ASSERT(0 == tracker->trigger_ref_count);

        /* All waiters should have been released at this point */
        MALI_DEBUG_ASSERT(NULL == tracker->waiter_head);
        MALI_DEBUG_ASSERT(NULL == tracker->waiter_tail);

        MALI_DEBUG_PRINT(3, ("Mali Timeline: releasing tracker for job 0x%08X\n", tracker->job));

        timeline = tracker->timeline;
        if (NULL == timeline) {
                /* Tracker was not on a timeline, there is nothing to release. */
                return MALI_SCHEDULER_MASK_EMPTY;
        }

        system = timeline->system;
        MALI_DEBUG_ASSERT_POINTER(system);

        mali_spinlock_reentrant_wait(system->spinlock, tid);

        /* Tracker should still be on timeline */
        MALI_DEBUG_ASSERT(!mali_timeline_is_empty(timeline));
        MALI_DEBUG_ASSERT(mali_timeline_is_point_on(timeline, tracker->point));

        /* Tracker is no longer valid. */
        MALI_DEBUG_CODE(tracker->magic = 0);

        tracker_next = tracker->timeline_next;
        tracker_prev = tracker->timeline_prev;
        tracker->timeline_next = NULL;
        tracker->timeline_prev = NULL;

        /* Removing tracker from timeline's tracker list */
        if (NULL == tracker_next) {
                /* This tracker was the head */
                timeline->tracker_head = tracker_prev;
        } else {
                tracker_next->timeline_prev = tracker_prev;
        }

        if (NULL == tracker_prev) {
                /* This tracker was the tail */
                timeline->tracker_tail = tracker_next;
                MALI_DEBUG_ASSERT(MALI_TIMELINE_SYSTEM_LOCKED(system));
                /* Update the timeline's oldest time and release any waiters */
                schedule_mask |= mali_timeline_update_oldest_point(timeline);
                MALI_DEBUG_ASSERT(MALI_TIMELINE_SYSTEM_LOCKED(system));
        } else {
                tracker_prev->timeline_next = tracker_next;
        }

        MALI_DEBUG_ASSERT(MALI_TIMELINE_SYSTEM_LOCKED(system));

        /* Update delayed work only when it is the soft job timeline */
        if (MALI_TIMELINE_SOFT == tracker->timeline->id) {
                mali_timeline_update_delayed_work(tracker->timeline);
        }

        mali_spinlock_reentrant_signal(system->spinlock, tid);

        return schedule_mask;
}

void mali_timeline_system_release_waiter_list(struct mali_timeline_system *system,
                struct mali_timeline_waiter *tail,
                struct mali_timeline_waiter *head)
{
        MALI_DEBUG_ASSERT_POINTER(system);
        MALI_DEBUG_ASSERT_POINTER(head);
        MALI_DEBUG_ASSERT_POINTER(tail);
        MALI_DEBUG_ASSERT(MALI_TIMELINE_SYSTEM_LOCKED(system));

        head->tracker_next = system->waiter_empty_list;
        system->waiter_empty_list = tail;
}

static mali_scheduler_mask mali_timeline_tracker_activate(struct mali_timeline_tracker *tracker)
{
        mali_scheduler_mask schedule_mask = MALI_SCHEDULER_MASK_EMPTY;
        struct mali_timeline_system *system;
        struct mali_timeline *timeline;
        u32 tid = _mali_osk_get_tid();

        MALI_DEBUG_ASSERT_POINTER(tracker);
        MALI_DEBUG_ASSERT(MALI_TIMELINE_TRACKER_MAGIC == tracker->magic);

        system = tracker->system;
        MALI_DEBUG_ASSERT_POINTER(system);
        MALI_DEBUG_ASSERT(MALI_TIMELINE_SYSTEM_LOCKED(system));

        tracker->os_tick_activate = _mali_osk_time_tickcount();

        if (NULL != tracker->waiter_head) {
                mali_timeline_system_release_waiter_list(system, tracker->waiter_tail, tracker->waiter_head);
                tracker->waiter_head = NULL;
                tracker->waiter_tail = NULL;
        }

        switch (tracker->type) {
        case MALI_TIMELINE_TRACKER_GP:
                schedule_mask = mali_scheduler_activate_gp_job((struct mali_gp_job *) tracker->job);

                _mali_osk_atomic_dec(&gp_tracker_count);
                break;
        case MALI_TIMELINE_TRACKER_PP:
                schedule_mask = mali_scheduler_activate_pp_job((struct mali_pp_job *) tracker->job);

                if (mali_pp_job_is_virtual((struct mali_pp_job *)tracker->job)) {
                        _mali_osk_atomic_dec(&virt_pp_tracker_count);
                } else {
                        _mali_osk_atomic_dec(&phy_pp_tracker_count);
                }
                break;
        case MALI_TIMELINE_TRACKER_SOFT:
                timeline = tracker->timeline;
                MALI_DEBUG_ASSERT_POINTER(timeline);

                schedule_mask |= mali_soft_job_system_activate_job((struct mali_soft_job *) tracker->job);

                /* Start a soft timer to make sure the soft job be released in a limited time */
                mali_spinlock_reentrant_wait(system->spinlock, tid);
                mali_timeline_update_delayed_work(timeline);
                mali_spinlock_reentrant_signal(system->spinlock, tid);
                break;
        case MALI_TIMELINE_TRACKER_WAIT:
                mali_timeline_fence_wait_activate((struct mali_timeline_fence_wait_tracker *) tracker->job);
                break;
        case MALI_TIMELINE_TRACKER_SYNC:
#if defined(CONFIG_SYNC)
                mali_timeline_sync_fence_activate((struct mali_timeline_sync_fence_tracker *) tracker->job);
#else
                MALI_PRINT_ERROR(("Mali Timeline: sync tracker not supported\n", tracker->type));
#endif /* defined(CONFIG_SYNC) */
                break;
        default:
                MALI_PRINT_ERROR(("Mali Timeline - Illegal tracker type: %d\n", tracker->type));
                break;
        }

        return schedule_mask;
}

void mali_timeline_system_tracker_get(struct mali_timeline_system *system, struct mali_timeline_tracker *tracker)
{
        u32 tid = _mali_osk_get_tid();

        MALI_DEBUG_ASSERT_POINTER(tracker);
        MALI_DEBUG_ASSERT_POINTER(system);

        mali_spinlock_reentrant_wait(system->spinlock, tid);

        MALI_DEBUG_ASSERT(0 < tracker->trigger_ref_count);
        tracker->trigger_ref_count++;

        mali_spinlock_reentrant_signal(system->spinlock, tid);
}

mali_scheduler_mask mali_timeline_system_tracker_put(struct mali_timeline_system *system, struct mali_timeline_tracker *tracker, mali_timeline_activation_error activation_error)
{
        u32 tid = _mali_osk_get_tid();
        mali_scheduler_mask schedule_mask = MALI_SCHEDULER_MASK_EMPTY;

        MALI_DEBUG_ASSERT_POINTER(tracker);
        MALI_DEBUG_ASSERT_POINTER(system);

        mali_spinlock_reentrant_wait(system->spinlock, tid);

        MALI_DEBUG_ASSERT(0 < tracker->trigger_ref_count);
        tracker->trigger_ref_count--;

        tracker->activation_error |= activation_error;

        if (0 == tracker->trigger_ref_count) {
                schedule_mask |= mali_timeline_tracker_activate(tracker);
                tracker = NULL;
        }

        mali_spinlock_reentrant_signal(system->spinlock, tid);

        return schedule_mask;
}

void mali_timeline_fence_copy_uk_fence(struct mali_timeline_fence *fence, _mali_uk_fence_t *uk_fence)
{
        u32 i;

        MALI_DEBUG_ASSERT_POINTER(fence);
        MALI_DEBUG_ASSERT_POINTER(uk_fence);

        for (i = 0; i < MALI_TIMELINE_MAX; ++i) {
                fence->points[i] = uk_fence->points[i];
        }

        fence->sync_fd = uk_fence->sync_fd;
}

struct mali_timeline_system *mali_timeline_system_create(struct mali_session_data *session)
{
        u32 i;
        struct mali_timeline_system *system;

        MALI_DEBUG_ASSERT_POINTER(session);
        MALI_DEBUG_PRINT(4, ("Mali Timeline: creating timeline system\n"));

        system = (struct mali_timeline_system *) _mali_osk_calloc(1, sizeof(struct mali_timeline_system));
        if (NULL == system) {
                return NULL;
        }

        system->spinlock = mali_spinlock_reentrant_init(_MALI_OSK_LOCK_ORDER_TIMELINE_SYSTEM);
        if (NULL == system->spinlock) {
                mali_timeline_system_destroy(system);
                return NULL;
        }

        for (i = 0; i < MALI_TIMELINE_MAX; ++i) {
                system->timelines[i] = mali_timeline_create(system, (enum mali_timeline_id)i);
                if (NULL == system->timelines[i]) {
                        mali_timeline_system_destroy(system);
                        return NULL;
                }
        }

#if defined(CONFIG_SYNC)
        system->signaled_sync_tl = mali_sync_timeline_create(NULL, "mali-always-signaled");
        if (NULL == system->signaled_sync_tl) {
                mali_timeline_system_destroy(system);
                return NULL;
        }
#endif /* defined(CONFIG_SYNC) */

        system->waiter_empty_list = NULL;
        system->session = session;
        system->timer_enabled = MALI_TRUE;

        system->wait_queue = _mali_osk_wait_queue_init();
        if (NULL == system->wait_queue) {
                mali_timeline_system_destroy(system);
                return NULL;
        }

        return system;
}

#if defined(CONFIG_SYNC)

/**
 * Check if there are any trackers left on timeline.
 *
 * Used as a wait queue conditional.
 *
 * @param data Timeline.
 * @return MALI_TRUE if there are no trackers on timeline, MALI_FALSE if not.
 */
static mali_bool mali_timeline_has_no_trackers(void *data)
{
        struct mali_timeline *timeline = (struct mali_timeline *) data;

        MALI_DEBUG_ASSERT_POINTER(timeline);

        return mali_timeline_is_empty(timeline);
}

/**
 * Cancel sync fence waiters waited upon by trackers on all timelines.
 *
 * Will return after all timelines have no trackers left.
 *
 * @param system Timeline system.
 */
static void mali_timeline_cancel_sync_fence_waiters(struct mali_timeline_system *system)
{
        u32 i;
        u32 tid = _mali_osk_get_tid();
        struct mali_timeline_tracker *tracker, *tracker_next;
        _MALI_OSK_LIST_HEAD_STATIC_INIT(tracker_list);

        MALI_DEBUG_ASSERT_POINTER(system);
        MALI_DEBUG_ASSERT_POINTER(system->session);
        MALI_DEBUG_ASSERT(system->session->is_aborting);

        mali_spinlock_reentrant_wait(system->spinlock, tid);

        /* Cancel sync fence waiters. */
        for (i = 0; i < MALI_TIMELINE_MAX; ++i) {
                struct mali_timeline *timeline = system->timelines[i];

                MALI_DEBUG_ASSERT_POINTER(timeline);

                tracker_next = timeline->tracker_tail;
                while (NULL != tracker_next) {
                        tracker = tracker_next;
                        tracker_next = tracker->timeline_next;

                        if (NULL == tracker->sync_fence) continue;

                        MALI_DEBUG_PRINT(3, ("Mali Timeline: Cancelling sync fence wait for tracker 0x%08X.\n", tracker));

                        /* Cancel sync fence waiter. */
                        if (0 == sync_fence_cancel_async(tracker->sync_fence, &tracker->sync_fence_waiter)) {
                                /* Callback was not called, move tracker to local list. */
                                _mali_osk_list_add(&tracker->sync_fence_cancel_list, &tracker_list);
                        }
                }
        }

        mali_spinlock_reentrant_signal(system->spinlock, tid);

        /* Manually call sync fence callback in order to release waiter and trigger activation of tracker. */
        _MALI_OSK_LIST_FOREACHENTRY(tracker, tracker_next, &tracker_list, struct mali_timeline_tracker, sync_fence_cancel_list) {
                mali_timeline_sync_fence_callback(tracker->sync_fence, &tracker->sync_fence_waiter);
        }

        /* Sleep until all sync fence callbacks are done and all timelines are empty. */
        for (i = 0; i < MALI_TIMELINE_MAX; ++i) {
                struct mali_timeline *timeline = system->timelines[i];

                MALI_DEBUG_ASSERT_POINTER(timeline);

                _mali_osk_wait_queue_wait_event(system->wait_queue, mali_timeline_has_no_trackers, (void *) timeline);
        }
}

#endif /* defined(CONFIG_SYNC) */

void mali_timeline_system_abort(struct mali_timeline_system *system)
{
        MALI_DEBUG_CODE(u32 tid = _mali_osk_get_tid(););

        MALI_DEBUG_ASSERT_POINTER(system);
        MALI_DEBUG_ASSERT_POINTER(system->session);
        MALI_DEBUG_ASSERT(system->session->is_aborting);

        MALI_DEBUG_PRINT(3, ("Mali Timeline: Aborting timeline system for session 0x%08X.\n", system->session));

#if defined(CONFIG_SYNC)
        mali_timeline_cancel_sync_fence_waiters(system);
#endif /* defined(CONFIG_SYNC) */

        /* Should not be any waiters or trackers left at this point. */
        MALI_DEBUG_CODE({
                u32 i;
                mali_spinlock_reentrant_wait(system->spinlock, tid);
                for (i = 0; i < MALI_TIMELINE_MAX; ++i)
                {
                        struct mali_timeline *timeline = system->timelines[i];
                        MALI_DEBUG_ASSERT_POINTER(timeline);
                        MALI_DEBUG_ASSERT(timeline->point_oldest == timeline->point_next);
                        MALI_DEBUG_ASSERT(NULL == timeline->tracker_head);
                        MALI_DEBUG_ASSERT(NULL == timeline->tracker_tail);
                        MALI_DEBUG_ASSERT(NULL == timeline->waiter_head);
                        MALI_DEBUG_ASSERT(NULL == timeline->waiter_tail);
                }
                mali_spinlock_reentrant_signal(system->spinlock, tid);
        });
}

void mali_timeline_system_destroy(struct mali_timeline_system *system)
{
        u32 i;
        struct mali_timeline_waiter *waiter, *next;

        MALI_DEBUG_ASSERT_POINTER(system);
        MALI_DEBUG_ASSERT_POINTER(system->session);

        MALI_DEBUG_PRINT(4, ("Mali Timeline: destroying timeline system\n"));

        if (NULL != system) {
                /* There should be no waiters left on this queue. */
                if (NULL != system->wait_queue) {
                        _mali_osk_wait_queue_term(system->wait_queue);
                        system->wait_queue = NULL;
                }

                /* Free all waiters in empty list */
                waiter = system->waiter_empty_list;
                while (NULL != waiter) {
                        next = waiter->tracker_next;
                        _mali_osk_free(waiter);
                        waiter = next;
                }

#if defined(CONFIG_SYNC)
                if (NULL != system->signaled_sync_tl) {
                        sync_timeline_destroy(system->signaled_sync_tl);
                }
#endif /* defined(CONFIG_SYNC) */

                for (i = 0; i < MALI_TIMELINE_MAX; ++i) {
                        if (NULL != system->timelines[i]) {
                                mali_timeline_destroy(system->timelines[i]);
                        }
                }
                if (NULL != system->spinlock) {
                        mali_spinlock_reentrant_term(system->spinlock);
                }

                _mali_osk_free(system);
        }
}

/**
 * Find how many waiters are needed for a given fence.
 *
 * @param fence The fence to check.
 * @return Number of waiters needed for fence.
 */
static u32 mali_timeline_fence_num_waiters(struct mali_timeline_fence *fence)
{
        u32 i, num_waiters = 0;

        MALI_DEBUG_ASSERT_POINTER(fence);

        for (i = 0; i < MALI_TIMELINE_MAX; ++i) {
                if (MALI_TIMELINE_NO_POINT != fence->points[i]) {
                        ++num_waiters;
                }
        }

#if defined(CONFIG_SYNC)
        if (-1 != fence->sync_fd) ++num_waiters;
#endif /* defined(CONFIG_SYNC) */

        return num_waiters;
}

static struct mali_timeline_waiter *mali_timeline_system_get_zeroed_waiter(struct mali_timeline_system *system)
{
        struct mali_timeline_waiter *waiter;

        MALI_DEBUG_ASSERT_POINTER(system);
        MALI_DEBUG_ASSERT(MALI_TIMELINE_SYSTEM_LOCKED(system));

        waiter = system->waiter_empty_list;
        if (NULL != waiter) {
                /* Remove waiter from empty list and zero it */
                system->waiter_empty_list = waiter->tracker_next;
                _mali_osk_memset(waiter, 0, sizeof(*waiter));
        }

        /* Return NULL if list was empty. */
        return waiter;
}

static void mali_timeline_system_allocate_waiters(struct mali_timeline_system *system,
                struct mali_timeline_waiter **tail,
                struct mali_timeline_waiter **head,
                int max_num_waiters)
{
        u32 i, tid = _mali_osk_get_tid();
        mali_bool do_alloc;
        struct mali_timeline_waiter *waiter;

        MALI_DEBUG_ASSERT_POINTER(system);
        MALI_DEBUG_ASSERT_POINTER(tail);
        MALI_DEBUG_ASSERT_POINTER(head);

        MALI_DEBUG_ASSERT(MALI_TIMELINE_SYSTEM_LOCKED(system));

        *head = *tail = NULL;
        do_alloc = MALI_FALSE;
        i = 0;
        while (i < max_num_waiters) {
                if (MALI_FALSE == do_alloc) {
                        waiter = mali_timeline_system_get_zeroed_waiter(system);
                        if (NULL == waiter) {
                                do_alloc = MALI_TRUE;
                                mali_spinlock_reentrant_signal(system->spinlock, tid);
                                continue;
                        }
                } else {
                        waiter = _mali_osk_calloc(1, sizeof(struct mali_timeline_waiter));
                        if (NULL == waiter) break;
                }
                ++i;
                if (NULL == *tail) {
                        *tail = waiter;
                        *head = waiter;
                } else {
                        (*head)->tracker_next = waiter;
                        *head = waiter;
                }
        }
        if (MALI_TRUE == do_alloc) {
                mali_spinlock_reentrant_wait(system->spinlock, tid);
        }
}

/**
 * Create waiters for the given tracker. The tracker is activated when all waiters are release.
 *
 * @note Tracker can potentially be activated before this function returns.
 *
 * @param system Timeline system.
 * @param tracker Tracker we will create waiters for.
 * @param waiter_tail List of pre-allocated waiters.
 * @param waiter_head List of pre-allocated waiters.
 */
static void mali_timeline_system_create_waiters_and_unlock(struct mali_timeline_system *system,
                struct mali_timeline_tracker *tracker,
                struct mali_timeline_waiter *waiter_tail,
                struct mali_timeline_waiter *waiter_head)
{
        int i;
        u32 tid = _mali_osk_get_tid();
        mali_scheduler_mask schedule_mask = MALI_SCHEDULER_MASK_EMPTY;
#if defined(CONFIG_SYNC)
        struct sync_fence *sync_fence = NULL;
#endif /* defined(CONFIG_SYNC) */

        MALI_DEBUG_ASSERT_POINTER(system);
        MALI_DEBUG_ASSERT_POINTER(tracker);

        MALI_DEBUG_ASSERT(MALI_TIMELINE_SYSTEM_LOCKED(system));

        MALI_DEBUG_ASSERT(NULL == tracker->waiter_head);
        MALI_DEBUG_ASSERT(NULL == tracker->waiter_tail);
        MALI_DEBUG_ASSERT(NULL != tracker->job);

        /* Creating waiter object for all the timelines the fence is put on. Inserting this waiter
         * into the timelines sorted list of waiters */
        for (i = 0; i < MALI_TIMELINE_MAX; ++i) {
                mali_timeline_point point;
                struct mali_timeline *timeline;
                struct mali_timeline_waiter *waiter;

                /* Get point on current timeline from tracker's fence. */
                point = tracker->fence.points[i];

                if (likely(MALI_TIMELINE_NO_POINT == point)) {
                        /* Fence contains no point on this timeline so we don't need a waiter. */
                        continue;
                }

                timeline = system->timelines[i];
                MALI_DEBUG_ASSERT_POINTER(timeline);

                if (unlikely(!mali_timeline_is_point_valid(timeline, point))) {
                        MALI_PRINT_ERROR(("Mali Timeline: point %d is not valid (oldest=%d, next=%d)\n",
                                          point, timeline->point_oldest, timeline->point_next));
                        continue;
                }

                if (likely(mali_timeline_is_point_released(timeline, point))) {
                        /* Tracker representing the point has been released so we don't need a
                         * waiter. */
                        continue;
                }

                /* The point is on timeline. */
                MALI_DEBUG_ASSERT(mali_timeline_is_point_on(timeline, point));

                /* Get a new zeroed waiter object. */
                if (likely(NULL != waiter_tail)) {
                        waiter = waiter_tail;
                        waiter_tail = waiter_tail->tracker_next;
                } else {
                        MALI_PRINT_ERROR(("Mali Timeline: failed to allocate memory for waiter\n"));
                        continue;
                }

                /* Yanking the trigger ref count of the tracker. */
                tracker->trigger_ref_count++;

                waiter->point   = point;
                waiter->tracker = tracker;

                /* Insert waiter on tracker's singly-linked waiter list. */
                if (NULL == tracker->waiter_head) {
                        /* list is empty */
                        MALI_DEBUG_ASSERT(NULL == tracker->waiter_tail);
                        tracker->waiter_tail = waiter;
                } else {
                        tracker->waiter_head->tracker_next = waiter;
                }
                tracker->waiter_head = waiter;

                /* Add waiter to timeline. */
                mali_timeline_insert_waiter(timeline, waiter);
        }
#if defined(CONFIG_SYNC)
        if (-1 != tracker->fence.sync_fd) {
                int ret;
                struct mali_timeline_waiter *waiter;

                sync_fence = sync_fence_fdget(tracker->fence.sync_fd);
                if (unlikely(NULL == sync_fence)) {
                        MALI_PRINT_ERROR(("Mali Timeline: failed to get sync fence from fd %d\n", tracker->fence.sync_fd));
                        goto exit;
                }

                /* Check if we have a zeroed waiter object available. */
                if (unlikely(NULL == waiter_tail)) {
                        MALI_PRINT_ERROR(("Mali Timeline: failed to allocate memory for waiter\n"));
                        goto exit;
                }

                /* Start asynchronous wait that will release waiter when the fence is signaled. */
                sync_fence_waiter_init(&tracker->sync_fence_waiter, mali_timeline_sync_fence_callback);
                ret = sync_fence_wait_async(sync_fence, &tracker->sync_fence_waiter);
                if (1 == ret) {
                        /* Fence already signaled, no waiter needed. */
                        tracker->fence.sync_fd = -1;
                        goto exit;
                } else if (0 != ret) {
                        MALI_PRINT_ERROR(("Mali Timeline: sync fence fd %d signaled with error %d\n", tracker->fence.sync_fd, ret));
                        tracker->activation_error |= MALI_TIMELINE_ACTIVATION_ERROR_SYNC_BIT;
                        goto exit;
                }

                /* Grab new zeroed waiter object. */
                waiter = waiter_tail;
                waiter_tail = waiter_tail->tracker_next;

                /* Increase the trigger ref count of the tracker. */
                tracker->trigger_ref_count++;

                waiter->point   = MALI_TIMELINE_NO_POINT;
                waiter->tracker = tracker;

                /* Insert waiter on tracker's singly-linked waiter list. */
                if (NULL == tracker->waiter_head) {
                        /* list is empty */
                        MALI_DEBUG_ASSERT(NULL == tracker->waiter_tail);
                        tracker->waiter_tail = waiter;
                } else {
                        tracker->waiter_head->tracker_next = waiter;
                }
                tracker->waiter_head = waiter;

                /* Also store waiter in separate field for easy access by sync callback. */
                tracker->waiter_sync = waiter;

                /* Store the sync fence in tracker so we can retrieve in abort session, if needed. */
                tracker->sync_fence = sync_fence;

                sync_fence = NULL;
        }
exit:
#endif /* defined(CONFIG_SYNC) */

        if (NULL != waiter_tail) {
                mali_timeline_system_release_waiter_list(system, waiter_tail, waiter_head);
        }

        /* Release the initial trigger ref count. */
        tracker->trigger_ref_count--;

        /* If there were no waiters added to this tracker we activate immediately. */
        if (0 == tracker->trigger_ref_count) {
                schedule_mask |= mali_timeline_tracker_activate(tracker);
        }

        mali_spinlock_reentrant_signal(system->spinlock, tid);

#if defined(CONFIG_SYNC)
        if (NULL != sync_fence) {
                sync_fence_put(sync_fence);
        }
#endif /* defined(CONFIG_SYNC) */

        mali_executor_schedule_from_mask(schedule_mask, MALI_FALSE);
}

mali_timeline_point mali_timeline_system_add_tracker(struct mali_timeline_system *system,
                struct mali_timeline_tracker *tracker,
                enum mali_timeline_id timeline_id)
{
        int num_waiters = 0;
        struct mali_timeline_waiter *waiter_tail, *waiter_head;
        u32 tid = _mali_osk_get_tid();
        mali_timeline_point point = MALI_TIMELINE_NO_POINT;

        MALI_DEBUG_ASSERT_POINTER(system);
        MALI_DEBUG_ASSERT_POINTER(system->session);
        MALI_DEBUG_ASSERT_POINTER(tracker);

        MALI_DEBUG_ASSERT(MALI_FALSE == system->session->is_aborting);
        MALI_DEBUG_ASSERT(MALI_TIMELINE_TRACKER_MAX > tracker->type);
        MALI_DEBUG_ASSERT(MALI_TIMELINE_TRACKER_MAGIC == tracker->magic);

        MALI_DEBUG_PRINT(4, ("Mali Timeline: adding tracker for job %p, timeline: %d\n", tracker->job, timeline_id));

        MALI_DEBUG_ASSERT(0 < tracker->trigger_ref_count);
        tracker->system = system;

        mali_spinlock_reentrant_wait(system->spinlock, tid);

        num_waiters = mali_timeline_fence_num_waiters(&tracker->fence);

        /* Allocate waiters. */
        mali_timeline_system_allocate_waiters(system, &waiter_tail, &waiter_head, num_waiters);
        MALI_DEBUG_ASSERT(MALI_TIMELINE_SYSTEM_LOCKED(system));

        /* Add tracker to timeline.  This will allocate a point for the tracker on the timeline. If
         * timeline ID is MALI_TIMELINE_NONE the tracker will NOT be added to a timeline and the
         * point will be MALI_TIMELINE_NO_POINT.
         *
         * NOTE: the tracker can fail to be added if the timeline is full.  If this happens, the
         * point will be MALI_TIMELINE_NO_POINT. */
        MALI_DEBUG_ASSERT(timeline_id < MALI_TIMELINE_MAX || timeline_id == MALI_TIMELINE_NONE);
        if (likely(timeline_id < MALI_TIMELINE_MAX)) {
                struct mali_timeline *timeline = system->timelines[timeline_id];
                mali_timeline_insert_tracker(timeline, tracker);
                MALI_DEBUG_ASSERT(!mali_timeline_is_empty(timeline));
        }

        point = tracker->point;

        /* Create waiters for tracker based on supplied fence.  Each waiter will increase the
         * trigger ref count. */
        mali_timeline_system_create_waiters_and_unlock(system, tracker, waiter_tail, waiter_head);
        tracker = NULL;

        /* At this point the tracker object might have been freed so we should no longer
         * access it. */


        /* The tracker will always be activated after calling add_tracker, even if NO_POINT is
         * returned. */
        return point;
}

static mali_scheduler_mask mali_timeline_system_release_waiter(struct mali_timeline_system *system,
                struct mali_timeline_waiter *waiter)
{
        struct mali_timeline_tracker *tracker;
        mali_scheduler_mask schedule_mask = MALI_SCHEDULER_MASK_EMPTY;

        MALI_DEBUG_ASSERT_POINTER(system);
        MALI_DEBUG_ASSERT_POINTER(waiter);

        MALI_DEBUG_ASSERT(MALI_TIMELINE_SYSTEM_LOCKED(system));

        tracker = waiter->tracker;
        MALI_DEBUG_ASSERT_POINTER(tracker);

        /* At this point the waiter has been removed from the timeline's waiter list, but it is
         * still on the tracker's waiter list.  All of the tracker's waiters will be released when
         * the tracker is activated. */

        waiter->point   = MALI_TIMELINE_NO_POINT;
        waiter->tracker = NULL;

        tracker->trigger_ref_count--;
        if (0 == tracker->trigger_ref_count) {
                /* This was the last waiter; activate tracker */
                schedule_mask |= mali_timeline_tracker_activate(tracker);
                tracker = NULL;
        }

        return schedule_mask;
}

mali_timeline_point mali_timeline_system_get_latest_point(struct mali_timeline_system *system,
                enum mali_timeline_id timeline_id)
{
        mali_timeline_point point;
        struct mali_timeline *timeline;
        u32 tid = _mali_osk_get_tid();

        MALI_DEBUG_ASSERT_POINTER(system);

        if (MALI_TIMELINE_MAX <= timeline_id) {
                return MALI_TIMELINE_NO_POINT;
        }

        mali_spinlock_reentrant_wait(system->spinlock, tid);

        timeline = system->timelines[timeline_id];
        MALI_DEBUG_ASSERT_POINTER(timeline);

        point = MALI_TIMELINE_NO_POINT;
        if (timeline->point_oldest != timeline->point_next) {
                point = timeline->point_next - 1;
                if (MALI_TIMELINE_NO_POINT == point) point--;
        }

        mali_spinlock_reentrant_signal(system->spinlock, tid);

        return point;
}

void mali_timeline_initialize(void)
{
        _mali_osk_atomic_init(&gp_tracker_count, 0);
        _mali_osk_atomic_init(&phy_pp_tracker_count, 0);
        _mali_osk_atomic_init(&virt_pp_tracker_count, 0);
}

void mali_timeline_terminate(void)
{
        _mali_osk_atomic_term(&gp_tracker_count);
        _mali_osk_atomic_term(&phy_pp_tracker_count);
        _mali_osk_atomic_term(&virt_pp_tracker_count);
}

#if defined(MALI_TIMELINE_DEBUG_FUNCTIONS)

static mali_bool is_waiting_on_timeline(struct mali_timeline_tracker *tracker, enum mali_timeline_id id)
{
        struct mali_timeline *timeline;
        struct mali_timeline_system *system;

        MALI_DEBUG_ASSERT_POINTER(tracker);

        MALI_DEBUG_ASSERT_POINTER(tracker->timeline);
        timeline = tracker->timeline;

        MALI_DEBUG_ASSERT_POINTER(timeline->system);
        system = timeline->system;

        if (MALI_TIMELINE_MAX > id) {
                if (MALI_TIMELINE_NO_POINT != tracker->fence.points[id]) {
                        return mali_timeline_is_point_on(system->timelines[id], tracker->fence.points[id]);
                } else {
                        return MALI_FALSE;
                }
        } else {
                MALI_DEBUG_ASSERT(MALI_TIMELINE_NONE == id);
                return MALI_FALSE;
        }
}

static const char *timeline_id_to_string(enum mali_timeline_id id)
{
        switch (id) {
        case MALI_TIMELINE_GP:
                return "GP";
        case MALI_TIMELINE_PP:
                return "PP";
        case MALI_TIMELINE_SOFT:
                return "SOFT";
        default:
                return "NONE";
        }
}

static const char *timeline_tracker_type_to_string(enum mali_timeline_tracker_type type)
{
        switch (type) {
        case MALI_TIMELINE_TRACKER_GP:
                return "GP";
        case MALI_TIMELINE_TRACKER_PP:
                return "PP";
        case MALI_TIMELINE_TRACKER_SOFT:
                return "SOFT";
        case MALI_TIMELINE_TRACKER_WAIT:
                return "WAIT";
        case MALI_TIMELINE_TRACKER_SYNC:
                return "SYNC";
        default:
                return "INVALID";
        }
}

mali_timeline_tracker_state mali_timeline_debug_get_tracker_state(struct mali_timeline_tracker *tracker)
{
        struct mali_timeline *timeline = NULL;

        MALI_DEBUG_ASSERT_POINTER(tracker);
        timeline = tracker->timeline;

        if (0 != tracker->trigger_ref_count) {
                return MALI_TIMELINE_TS_WAITING;
        }

        if (timeline && (timeline->tracker_tail == tracker || NULL != tracker->timeline_prev)) {
                return MALI_TIMELINE_TS_ACTIVE;
        }

        if (timeline && (MALI_TIMELINE_NO_POINT == tracker->point)) {
                return MALI_TIMELINE_TS_INIT;
        }

        return MALI_TIMELINE_TS_FINISH;
}

void mali_timeline_debug_print_tracker(struct mali_timeline_tracker *tracker, _mali_osk_print_ctx *print_ctx)
{
        const char *tracker_state = "IWAF";
        char state_char = 'I';
        char tracker_type[32] = {0};

        MALI_DEBUG_ASSERT_POINTER(tracker);

        state_char = *(tracker_state + mali_timeline_debug_get_tracker_state(tracker));
        _mali_osk_snprintf(tracker_type, sizeof(tracker_type), "%s", timeline_tracker_type_to_string(tracker->type));

#if defined(CONFIG_SYNC)
        if (0 != tracker->trigger_ref_count) {
                _mali_osk_ctxprintf(print_ctx, "TL:  %s %u %c - ref_wait:%u [%s(%u),%s(%u),%s(%u), fd:%d, fence:(0x%08X)]  job:(0x%08X)\n",
                                    tracker_type, tracker->point, state_char, tracker->trigger_ref_count,
                                    is_waiting_on_timeline(tracker, MALI_TIMELINE_GP) ? "WaitGP" : " ", tracker->fence.points[0],
                                    is_waiting_on_timeline(tracker, MALI_TIMELINE_PP) ? "WaitPP" : " ", tracker->fence.points[1],
                                    is_waiting_on_timeline(tracker, MALI_TIMELINE_SOFT) ? "WaitSOFT" : " ", tracker->fence.points[2],
                                    tracker->fence.sync_fd, tracker->sync_fence, tracker->job);
        } else {
                _mali_osk_ctxprintf(print_ctx, "TL:  %s %u %c  fd:%d  fence:(0x%08X)  job:(0x%08X)\n",
                                    tracker_type, tracker->point, state_char,
                                    tracker->fence.sync_fd, tracker->sync_fence, tracker->job);
        }
#else
        if (0 != tracker->trigger_ref_count) {
                _mali_osk_ctxprintf(print_ctx, "TL:  %s %u %c - ref_wait:%u [%s(%u),%s(%u),%s(%u)]  job:(0x%08X)\n",
                                    tracker_type, tracker->point, state_char, tracker->trigger_ref_count,
                                    is_waiting_on_timeline(tracker, MALI_TIMELINE_GP) ? "WaitGP" : " ", tracker->fence.points[0],
                                    is_waiting_on_timeline(tracker, MALI_TIMELINE_PP) ? "WaitPP" : " ", tracker->fence.points[1],
                                    is_waiting_on_timeline(tracker, MALI_TIMELINE_SOFT) ? "WaitSOFT" : " ", tracker->fence.points[2],
                                    tracker->job);
        } else {
                _mali_osk_ctxprintf(print_ctx, "TL:  %s %u %c  job:(0x%08X)\n",
                                    tracker_type, tracker->point, state_char,
                                    tracker->job);
        }
#endif
}

void mali_timeline_debug_print_timeline(struct mali_timeline *timeline, _mali_osk_print_ctx *print_ctx)
{
        struct mali_timeline_tracker *tracker = NULL;

        MALI_DEBUG_ASSERT_POINTER(timeline);

        tracker = timeline->tracker_tail;
        while (NULL != tracker) {
                mali_timeline_debug_print_tracker(tracker, print_ctx);
                tracker = tracker->timeline_next;
        }
}

void mali_timeline_debug_print_system(struct mali_timeline_system *system, _mali_osk_print_ctx *print_ctx)
{
        int i;
        int num_printed = 0;
        u32 tid = _mali_osk_get_tid();

        MALI_DEBUG_ASSERT_POINTER(system);

        mali_spinlock_reentrant_wait(system->spinlock, tid);

        /* Print all timelines */
        for (i = 0; i < MALI_TIMELINE_MAX; ++i) {
                struct mali_timeline *timeline = system->timelines[i];

                MALI_DEBUG_ASSERT_POINTER(timeline);

                if (NULL == timeline->tracker_head) continue;

                _mali_osk_ctxprintf(print_ctx, "TL: Timeline %s:\n",
                                    timeline_id_to_string((enum mali_timeline_id)i));

                mali_timeline_debug_print_timeline(timeline, print_ctx);
                num_printed++;
        }

        if (0 == num_printed) {
                _mali_osk_ctxprintf(print_ctx, "TL: All timelines empty\n");
        }

        mali_spinlock_reentrant_signal(system->spinlock, tid);
}

#endif /* defined(MALI_TIMELINE_DEBUG_FUNCTIONS) */