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/*

 * Copyright 2009 Jerome Glisse.

 * All Rights Reserved.

 *

 * 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, sub license, 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 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 NON-INFRINGEMENT. IN NO EVENT SHALL

 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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.

 *

 * The above copyright notice and this permission notice (including the

 * next paragraph) shall be included in all copies or substantial portions

 * of the Software.

 *

 */

/*

 * Authors:

 *    Jerome Glisse 

 *    Dave Airlie

 */

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include "radeon_reg.h"

#include "radeon.h"

/*

 * Fences

 * Fences mark an event in the GPUs pipeline and are used

 * for GPU/CPU synchronization.  When the fence is written,

 * it is expected that all buffers associated with that fence

 * are no longer in use by the associated ring on the GPU and

 * that the the relevant GPU caches have been flushed.  Whether

 * we use a scratch register or memory location depends on the asic

 * and whether writeback is enabled.

 */

/**

 * radeon_fence_write - write a fence value

 *

 * @rdev: radeon_device pointer

 * @seq: sequence number to write

 * @ring: ring index the fence is associated with

 *

 * Writes a fence value to memory or a scratch register (all asics).

 */

static void radeon_fence_write(struct radeon_device *rdev, u32 seq, int ring)

{

	struct radeon_fence_driver *drv = &rdev->fence_drv[ring];

	if (likely(rdev->wb.enabled || !drv->scratch_reg)) {

		*drv->cpu_addr = cpu_to_le32(seq);

	} else {

		WREG32(drv->scratch_reg, seq);

	}

}

/**

 * radeon_fence_read - read a fence value

 *

 * @rdev: radeon_device pointer

 * @ring: ring index the fence is associated with

 *

 * Reads a fence value from memory or a scratch register (all asics).

 * Returns the value of the fence read from memory or register.

 */

static u32 radeon_fence_read(struct radeon_device *rdev, int ring)

{

	struct radeon_fence_driver *drv = &rdev->fence_drv[ring];

	u32 seq = 0;

	if (likely(rdev->wb.enabled || !drv->scratch_reg)) {

		seq = le32_to_cpu(*drv->cpu_addr);

	} else {

		seq = RREG32(drv->scratch_reg);

	}

	return seq;

}

/**

 * radeon_fence_emit - emit a fence on the requested ring

 *

 * @rdev: radeon_device pointer

 * @fence: radeon fence object

 * @ring: ring index the fence is associated with

 *

 * Emits a fence command on the requested ring (all asics).

 * Returns 0 on success, -ENOMEM on failure.

 */

int radeon_fence_emit(struct radeon_device *rdev,

		      struct radeon_fence **fence,

		      int ring)

{

	/* we are protected by the ring emission mutex */

	*fence = kmalloc(sizeof(struct radeon_fence), GFP_KERNEL);

	if ((*fence) == NULL) {

		return -ENOMEM;

	}

	kref_init(&((*fence)->kref));

	(*fence)->rdev = rdev;

	(*fence)->seq = ++rdev->fence_drv[ring].sync_seq[ring];

	(*fence)->ring = ring;

	radeon_fence_ring_emit(rdev, ring, *fence);

//   trace_radeon_fence_emit(rdev->ddev, (*fence)->seq);

	return 0;

}

/**

 * radeon_fence_process - process a fence

 *

 * @rdev: radeon_device pointer

 * @ring: ring index the fence is associated with

 *

 * Checks the current fence value and wakes the fence queue

 * if the sequence number has increased (all asics).

 */

void radeon_fence_process(struct radeon_device *rdev, int ring)

{

	uint64_t seq, last_seq, last_emitted;

	unsigned count_loop = 0;

	bool wake = false;

	/* Note there is a scenario here for an infinite loop but it's

	 * very unlikely to happen. For it to happen, the current polling

	 * process need to be interrupted by another process and another

	 * process needs to update the last_seq btw the atomic read and

	 * xchg of the current process.

	 *

	 * More over for this to go in infinite loop there need to be

	 * continuously new fence signaled ie radeon_fence_read needs

	 * to return a different value each time for both the currently

	 * polling process and the other process that xchg the last_seq

	 * btw atomic read and xchg of the current process. And the

	 * value the other process set as last seq must be higher than

	 * the seq value we just read. Which means that current process

	 * need to be interrupted after radeon_fence_read and before

	 * atomic xchg.

	 *

	 * To be even more safe we count the number of time we loop and

	 * we bail after 10 loop just accepting the fact that we might

	 * have temporarly set the last_seq not to the true real last

	 * seq but to an older one.

	 */

	last_seq = atomic64_read(&rdev->fence_drv[ring].last_seq);

	do {

		last_emitted = rdev->fence_drv[ring].sync_seq[ring];

		seq = radeon_fence_read(rdev, ring);

		seq |= last_seq & 0xffffffff00000000LL;

		if (seq < last_seq) {

			seq &= 0xffffffff;

			seq |= last_emitted & 0xffffffff00000000LL;

		}

		if (seq <= last_seq || seq > last_emitted) {

			break;

		}

		/* If we loop over we don't want to return without

		 * checking if a fence is signaled as it means that the

		 * seq we just read is different from the previous on.

		 */

		wake = true;

		last_seq = seq;

		if ((count_loop++) > 10) {

			/* We looped over too many time leave with the

			 * fact that we might have set an older fence

			 * seq then the current real last seq as signaled

			 * by the hw.

			 */

			break;

		}

	} while (atomic64_xchg(&rdev->fence_drv[ring].last_seq, seq) > seq);

	if (wake) {

		rdev->fence_drv[ring].last_activity = GetTimerTicks();

		wake_up_all(&rdev->fence_queue);

	}

}

/**

 * radeon_fence_destroy - destroy a fence

 *

 * @kref: fence kref

 *

 * Frees the fence object (all asics).

 */

static void radeon_fence_destroy(struct kref *kref)

{

	struct radeon_fence *fence;

	fence = container_of(kref, struct radeon_fence, kref);

	kfree(fence);

}

/**

 * radeon_fence_seq_signaled - check if a fence sequeuce number has signaled

 *

 * @rdev: radeon device pointer

 * @seq: sequence number

 * @ring: ring index the fence is associated with

 *

 * Check if the last singled fence sequnce number is >= the requested

 * sequence number (all asics).

 * Returns true if the fence has signaled (current fence value

 * is >= requested value) or false if it has not (current fence

 * value is < the requested value.  Helper function for

 * radeon_fence_signaled().

 */

static bool radeon_fence_seq_signaled(struct radeon_device *rdev,

				      u64 seq, unsigned ring)

{

	if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq) {

		return true;

	}

	/* poll new last sequence at least once */

	radeon_fence_process(rdev, ring);

	if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq) {

		return true;

	}

	return false;

}

/**

 * radeon_fence_signaled - check if a fence has signaled

 *

 * @fence: radeon fence object

 *

 * Check if the requested fence has signaled (all asics).

 * Returns true if the fence has signaled or false if it has not.

				 */

bool radeon_fence_signaled(struct radeon_fence *fence)

{

	if (!fence) {

		return true;

	}

	if (fence->seq == RADEON_FENCE_SIGNALED_SEQ) {

		return true;

	}

	if (radeon_fence_seq_signaled(fence->rdev, fence->seq, fence->ring)) {

		fence->seq = RADEON_FENCE_SIGNALED_SEQ;

		return true;

	}

	return false;

}

/**

 * radeon_fence_wait_seq - wait for a specific sequence number

 *

 * @rdev: radeon device pointer

 * @target_seq: sequence number we want to wait for

 * @ring: ring index the fence is associated with

 * @intr: use interruptable sleep

 * @lock_ring: whether the ring should be locked or not

 *

 * Wait for the requested sequence number to be written (all asics).

 * @intr selects whether to use interruptable (true) or non-interruptable

 * (false) sleep when waiting for the sequence number.  Helper function

 * for radeon_fence_wait(), et al.

 * Returns 0 if the sequence number has passed, error for all other cases.

 * -EDEADLK is returned when a GPU lockup has been detected and the ring is

 * marked as not ready so no further jobs get scheduled until a successful

 * reset.

 */

static int radeon_fence_wait_seq(struct radeon_device *rdev, u64 target_seq,

				 unsigned ring, bool intr, bool lock_ring)

{

	unsigned long timeout, last_activity;

	uint64_t seq;

	unsigned i;

	bool signaled;

	int r;

	while (target_seq > atomic64_read(&rdev->fence_drv[ring].last_seq)) {

		if (!rdev->ring[ring].ready) {

			return -EBUSY;

			}

		timeout = GetTimerTicks() - RADEON_FENCE_JIFFIES_TIMEOUT;

		if (time_after(rdev->fence_drv[ring].last_activity, timeout)) {

			/* the normal case, timeout is somewhere before last_activity */

			timeout = rdev->fence_drv[ring].last_activity - timeout;

		} else {

			/* either jiffies wrapped around, or no fence was signaled in the last 500ms

			 * anyway we will just wait for the minimum amount and then check for a lockup

			 */

			timeout = 1;

	}

		seq = atomic64_read(&rdev->fence_drv[ring].last_seq);

		/* Save current last activity valuee, used to check for GPU lockups */

		last_activity = rdev->fence_drv[ring].last_activity;

//		trace_radeon_fence_wait_begin(rdev->ddev, seq);

		radeon_irq_kms_sw_irq_get(rdev, ring);

        if (intr) {

			r = wait_event_interruptible_timeout(rdev->fence_queue,

                (signaled = radeon_fence_seq_signaled(rdev, target_seq, ring)),

                timeout);

            } else {

            r = wait_event_timeout(rdev->fence_queue,

                (signaled = radeon_fence_seq_signaled(rdev, target_seq, ring)),

               timeout);

            }

		radeon_irq_kms_sw_irq_put(rdev, ring);

        if (unlikely(r < 0)) {

            return r;

        }

//		trace_radeon_fence_wait_end(rdev->ddev, seq);

		if (unlikely(!signaled)) {

			/* we were interrupted for some reason and fence

			 * isn't signaled yet, resume waiting */

			if (r) {

				continue;

	}

			/* check if sequence value has changed since last_activity */

			if (seq != atomic64_read(&rdev->fence_drv[ring].last_seq)) {

				continue;

			}

			if (lock_ring) {

				mutex_lock(&rdev->ring_lock);

	}

			/* test if somebody else has already decided that this is a lockup */

			if (last_activity != rdev->fence_drv[ring].last_activity) {

				if (lock_ring) {

					mutex_unlock(&rdev->ring_lock);

				}

				continue;

			}

			if (radeon_ring_is_lockup(rdev, ring, &rdev->ring[ring])) {

				/* good news we believe it's a lockup */

				dev_warn(rdev->dev, "GPU lockup (waiting for 0x%016llx last fence id 0x%016llx)\n",

					 target_seq, seq);

				/* change last activity so nobody else think there is a lockup */

				for (i = 0; i < RADEON_NUM_RINGS; ++i) {

                    rdev->fence_drv[i].last_activity = GetTimerTicks();

				}

				/* mark the ring as not ready any more */

				rdev->ring[ring].ready = false;

				if (lock_ring) {

					mutex_unlock(&rdev->ring_lock);

				}

				return -EDEADLK;

			}

			if (lock_ring) {

				mutex_unlock(&rdev->ring_lock);

			}

		}

	}

	return 0;

}

/**

 * radeon_fence_wait - wait for a fence to signal

 *

 * @fence: radeon fence object

 * @intr: use interruptable sleep

 *

 * Wait for the requested fence to signal (all asics).

 * @intr selects whether to use interruptable (true) or non-interruptable

 * (false) sleep when waiting for the fence.

 * Returns 0 if the fence has passed, error for all other cases.

 */

int radeon_fence_wait(struct radeon_fence *fence, bool intr)

{

	int r;

	if (fence == NULL) {

		WARN(1, "Querying an invalid fence : %p !\n", fence);

		return -EINVAL;

	}

	r = radeon_fence_wait_seq(fence->rdev, fence->seq,

				  fence->ring, intr, true);

	if (r) {

		return r;

	}

	fence->seq = RADEON_FENCE_SIGNALED_SEQ;

		return 0;

}

static bool radeon_fence_any_seq_signaled(struct radeon_device *rdev, u64 *seq)

{

	unsigned i;

	for (i = 0; i < RADEON_NUM_RINGS; ++i) {

		if (seq[i] && radeon_fence_seq_signaled(rdev, seq[i], i)) {

			return true;

		}

	}

	return false;

}

/**

 * radeon_fence_wait_any_seq - wait for a sequence number on any ring

 *

 * @rdev: radeon device pointer

 * @target_seq: sequence number(s) we want to wait for

 * @intr: use interruptable sleep

 *

 * Wait for the requested sequence number(s) to be written by any ring

 * (all asics).  Sequnce number array is indexed by ring id.

 * @intr selects whether to use interruptable (true) or non-interruptable

 * (false) sleep when waiting for the sequence number.  Helper function

 * for radeon_fence_wait_any(), et al.

 * Returns 0 if the sequence number has passed, error for all other cases.

 */

static int radeon_fence_wait_any_seq(struct radeon_device *rdev,

				     u64 *target_seq, bool intr)

{

	unsigned long timeout, last_activity, tmp;

	unsigned i, ring = RADEON_NUM_RINGS;

	bool signaled;

	int r;

	for (i = 0, last_activity = 0; i < RADEON_NUM_RINGS; ++i) {

		if (!target_seq[i]) {

			continue;

		}

		/* use the most recent one as indicator */

		if (time_after(rdev->fence_drv[i].last_activity, last_activity)) {

			last_activity = rdev->fence_drv[i].last_activity;

	}

		/* For lockup detection just pick the lowest ring we are

		 * actively waiting for

		 */

		if (i < ring) {

			ring = i;

		}

	}

	/* nothing to wait for ? */

	if (ring == RADEON_NUM_RINGS) {

		return -ENOENT;

	}

	while (!radeon_fence_any_seq_signaled(rdev, target_seq)) {

        timeout = GetTimerTicks() - RADEON_FENCE_JIFFIES_TIMEOUT;

		if (time_after(last_activity, timeout)) {

			/* the normal case, timeout is somewhere before last_activity */

			timeout = last_activity - timeout;

		} else {

			/* either jiffies wrapped around, or no fence was signaled in the last 500ms

			 * anyway we will just wait for the minimum amount and then check for a lockup

			 */

			timeout = 1;

		}

//		trace_radeon_fence_wait_begin(rdev->ddev, target_seq[ring]);

		for (i = 0; i < RADEON_NUM_RINGS; ++i) {

			if (target_seq[i]) {

				radeon_irq_kms_sw_irq_get(rdev, i);

			}

		}

		if (intr) {

			r = wait_event_interruptible_timeout(rdev->fence_queue,

				(signaled = radeon_fence_any_seq_signaled(rdev, target_seq)),

				timeout);

		} else {

			r = wait_event_timeout(rdev->fence_queue,

				(signaled = radeon_fence_any_seq_signaled(rdev, target_seq)),

				timeout);

		}

		for (i = 0; i < RADEON_NUM_RINGS; ++i) {

			if (target_seq[i]) {

				radeon_irq_kms_sw_irq_put(rdev, i);

			}

		}

		if (unlikely(r < 0)) {

			return r;

		}

//   trace_radeon_fence_wait_end(rdev->ddev, seq);

		if (unlikely(!signaled)) {

			/* we were interrupted for some reason and fence

			 * isn't signaled yet, resume waiting */

		if (r) {

				continue;

			}

			mutex_lock(&rdev->ring_lock);

			for (i = 0, tmp = 0; i < RADEON_NUM_RINGS; ++i) {

				if (time_after(rdev->fence_drv[i].last_activity, tmp)) {

					tmp = rdev->fence_drv[i].last_activity;

				}

			}

			/* test if somebody else has already decided that this is a lockup */

			if (last_activity != tmp) {

				last_activity = tmp;

				mutex_unlock(&rdev->ring_lock);

				continue;

		}

			if (radeon_ring_is_lockup(rdev, ring, &rdev->ring[ring])) {

			/* good news we believe it's a lockup */

				dev_warn(rdev->dev, "GPU lockup (waiting for 0x%016llx)\n",

					 target_seq[ring]);

				/* change last activity so nobody else think there is a lockup */

				for (i = 0; i < RADEON_NUM_RINGS; ++i) {

					rdev->fence_drv[i].last_activity = GetTimerTicks();

				}

				/* mark the ring as not ready any more */

				rdev->ring[ring].ready = false;

				mutex_unlock(&rdev->ring_lock);

				return -EDEADLK;

			}

			mutex_unlock(&rdev->ring_lock);

			}

	}

    return 0;

}

/**

 * radeon_fence_wait_any - wait for a fence to signal on any ring

 *

 * @rdev: radeon device pointer

 * @fences: radeon fence object(s)

 * @intr: use interruptable sleep

 *

 * Wait for any requested fence to signal (all asics).  Fence

 * array is indexed by ring id.  @intr selects whether to use

 * interruptable (true) or non-interruptable (false) sleep when

 * waiting for the fences. Used by the suballocator.

 * Returns 0 if any fence has passed, error for all other cases.

 */

int radeon_fence_wait_any(struct radeon_device *rdev,

			  struct radeon_fence **fences,

			  bool intr)

{

	uint64_t seq[RADEON_NUM_RINGS];

	unsigned i;

	int r;

	for (i = 0; i < RADEON_NUM_RINGS; ++i) {

		seq[i] = 0;

		if (!fences[i]) {

			continue;

		}

		if (fences[i]->seq == RADEON_FENCE_SIGNALED_SEQ) {

			/* something was allready signaled */

		return 0;

	}

		seq[i] = fences[i]->seq;

	}

	r = radeon_fence_wait_any_seq(rdev, seq, intr);

	if (r) {

		return r;

	}

	return 0;

}

/**

 * radeon_fence_wait_next_locked - wait for the next fence to signal

 *

 * @rdev: radeon device pointer

 * @ring: ring index the fence is associated with

 *

 * Wait for the next fence on the requested ring to signal (all asics).

 * Returns 0 if the next fence has passed, error for all other cases.

 * Caller must hold ring lock.

 */

int radeon_fence_wait_next_locked(struct radeon_device *rdev, int ring)

{

	uint64_t seq;

	seq = atomic64_read(&rdev->fence_drv[ring].last_seq) + 1ULL;

	if (seq >= rdev->fence_drv[ring].sync_seq[ring]) {

		/* nothing to wait for, last_seq is

		   already the last emited fence */

		return -ENOENT;

	}

	return radeon_fence_wait_seq(rdev, seq, ring, false, false);

}

/**

 * radeon_fence_wait_empty_locked - wait for all fences to signal

 *

 * @rdev: radeon device pointer

 * @ring: ring index the fence is associated with

 *

 * Wait for all fences on the requested ring to signal (all asics).

 * Returns 0 if the fences have passed, error for all other cases.

 * Caller must hold ring lock.

 */

int radeon_fence_wait_empty_locked(struct radeon_device *rdev, int ring)

{

	uint64_t seq = rdev->fence_drv[ring].sync_seq[ring];

	int r;

		r = radeon_fence_wait_seq(rdev, seq, ring, false, false);

	if (r) {

		if (r == -EDEADLK) {

			return -EDEADLK;

	}

		dev_err(rdev->dev, "error waiting for ring[%d] to become idle (%d)\n",

			ring, r);

	}

	return 0;

}

/**

 * radeon_fence_ref - take a ref on a fence

 *

 * @fence: radeon fence object

 *

 * Take a reference on a fence (all asics).

 * Returns the fence.

 */

struct radeon_fence *radeon_fence_ref(struct radeon_fence *fence)

{

	kref_get(&fence->kref);

	return fence;

}

/**

 * radeon_fence_unref - remove a ref on a fence

 *

 * @fence: radeon fence object

 *

 * Remove a reference on a fence (all asics).

 */

void radeon_fence_unref(struct radeon_fence **fence)

{

    struct radeon_fence *tmp = *fence;

    *fence = NULL;

	if (tmp) {

		kref_put(&tmp->kref, radeon_fence_destroy);

	}

}

/**

 * radeon_fence_count_emitted - get the count of emitted fences

 *

 * @rdev: radeon device pointer

 * @ring: ring index the fence is associated with

 *

 * Get the number of fences emitted on the requested ring (all asics).

 * Returns the number of emitted fences on the ring.  Used by the

 * dynpm code to ring track activity.

 */

unsigned radeon_fence_count_emitted(struct radeon_device *rdev, int ring)

{

	uint64_t emitted;

	/* We are not protected by ring lock when reading the last sequence

	 * but it's ok to report slightly wrong fence count here.

	 */

	radeon_fence_process(rdev, ring);

	emitted = rdev->fence_drv[ring].sync_seq[ring]

		- atomic64_read(&rdev->fence_drv[ring].last_seq);

	/* to avoid 32bits warp around */

	if (emitted > 0x10000000) {

		emitted = 0x10000000;

	}

	return (unsigned)emitted;

}

/**

 * radeon_fence_need_sync - do we need a semaphore

 *

 * @fence: radeon fence object

 * @dst_ring: which ring to check against

 *

 * Check if the fence needs to be synced against another ring

 * (all asics).  If so, we need to emit a semaphore.

 * Returns true if we need to sync with another ring, false if

 * not.

 */

bool radeon_fence_need_sync(struct radeon_fence *fence, int dst_ring)

{

	struct radeon_fence_driver *fdrv;

	if (!fence) {

		return false;

	}

	if (fence->ring == dst_ring) {

		return false;

	}

	/* we are protected by the ring mutex */

	fdrv = &fence->rdev->fence_drv[dst_ring];

	if (fence->seq <= fdrv->sync_seq[fence->ring]) {

		return false;

	}

	return true;

}

/**

 * radeon_fence_note_sync - record the sync point

 *

 * @fence: radeon fence object

 * @dst_ring: which ring to check against

 *

 * Note the sequence number at which point the fence will

 * be synced with the requested ring (all asics).

 */

void radeon_fence_note_sync(struct radeon_fence *fence, int dst_ring)

{

	struct radeon_fence_driver *dst, *src;

	unsigned i;

	if (!fence) {

		return;

	}

	if (fence->ring == dst_ring) {

		return;

	}

	/* we are protected by the ring mutex */

	src = &fence->rdev->fence_drv[fence->ring];

	dst = &fence->rdev->fence_drv[dst_ring];

	for (i = 0; i < RADEON_NUM_RINGS; ++i) {

		if (i == dst_ring) {

			continue;

		}

		dst->sync_seq[i] = max(dst->sync_seq[i], src->sync_seq[i]);

	}

}

/**

 * radeon_fence_driver_start_ring - make the fence driver

 * ready for use on the requested ring.

 *

 * @rdev: radeon device pointer

 * @ring: ring index to start the fence driver on

 *

 * Make the fence driver ready for processing (all asics).

 * Not all asics have all rings, so each asic will only

 * start the fence driver on the rings it has.

 * Returns 0 for success, errors for failure.

 */

int radeon_fence_driver_start_ring(struct radeon_device *rdev, int ring)

{

	uint64_t index;

	int r;

	radeon_scratch_free(rdev, rdev->fence_drv[ring].scratch_reg);

	if (rdev->wb.use_event || !radeon_ring_supports_scratch_reg(rdev, &rdev->ring[ring])) {

		rdev->fence_drv[ring].scratch_reg = 0;

		index = R600_WB_EVENT_OFFSET + ring * 4;

	} else {

		r = radeon_scratch_get(rdev, &rdev->fence_drv[ring].scratch_reg);

	if (r) {

		dev_err(rdev->dev, "fence failed to get scratch register\n");

		return r;

	}

		index = RADEON_WB_SCRATCH_OFFSET +

			rdev->fence_drv[ring].scratch_reg -

			rdev->scratch.reg_base;

	}

	rdev->fence_drv[ring].cpu_addr = &rdev->wb.wb[index/4];

	rdev->fence_drv[ring].gpu_addr = rdev->wb.gpu_addr + index;

	radeon_fence_write(rdev, atomic64_read(&rdev->fence_drv[ring].last_seq), ring);

	rdev->fence_drv[ring].initialized = true;

	dev_info(rdev->dev, "fence driver on ring %d use gpu addr 0x%016llx and cpu addr 0x%p\n",

		 ring, rdev->fence_drv[ring].gpu_addr, rdev->fence_drv[ring].cpu_addr);

    return 0;

}

/**

 * radeon_fence_driver_init_ring - init the fence driver

 * for the requested ring.

 *

 * @rdev: radeon device pointer

 * @ring: ring index to start the fence driver on

 *

 * Init the fence driver for the requested ring (all asics).

 * Helper function for radeon_fence_driver_init().

 */

static void radeon_fence_driver_init_ring(struct radeon_device *rdev, int ring)

{

	int i;

	rdev->fence_drv[ring].scratch_reg = -1;

	rdev->fence_drv[ring].cpu_addr = NULL;

	rdev->fence_drv[ring].gpu_addr = 0;

	for (i = 0; i < RADEON_NUM_RINGS; ++i)

		rdev->fence_drv[ring].sync_seq[i] = 0;

	atomic64_set(&rdev->fence_drv[ring].last_seq, 0);

    rdev->fence_drv[ring].last_activity = GetTimerTicks();

	rdev->fence_drv[ring].initialized = false;

}

/**

 * radeon_fence_driver_init - init the fence driver

 * for all possible rings.

 *

 * @rdev: radeon device pointer

 *

 * Init the fence driver for all possible rings (all asics).

 * Not all asics have all rings, so each asic will only

 * start the fence driver on the rings it has using

 * radeon_fence_driver_start_ring().

 * Returns 0 for success.

 */

int radeon_fence_driver_init(struct radeon_device *rdev)

{

	int ring;

	init_waitqueue_head(&rdev->fence_queue);

	for (ring = 0; ring < RADEON_NUM_RINGS; ring++) {

		radeon_fence_driver_init_ring(rdev, ring);

	}

	if (radeon_debugfs_fence_init(rdev)) {

		dev_err(rdev->dev, "fence debugfs file creation failed\n");

	}

	return 0;

}

/**

 * radeon_fence_driver_fini - tear down the fence driver

 * for all possible rings.

 *

 * @rdev: radeon device pointer

 *

 * Tear down the fence driver for all possible rings (all asics).

 */

void radeon_fence_driver_fini(struct radeon_device *rdev)

{

	int ring, r;

	mutex_lock(&rdev->ring_lock);

	for (ring = 0; ring < RADEON_NUM_RINGS; ring++) {

		if (!rdev->fence_drv[ring].initialized)

			continue;

		r = radeon_fence_wait_empty_locked(rdev, ring);

		if (r) {

			/* no need to trigger GPU reset as we are unloading */

			radeon_fence_driver_force_completion(rdev);

		}

		wake_up_all(&rdev->fence_queue);

		radeon_scratch_free(rdev, rdev->fence_drv[ring].scratch_reg);

		rdev->fence_drv[ring].initialized = false;

	}

	mutex_unlock(&rdev->ring_lock);

}

/**

 * radeon_fence_driver_force_completion - force all fence waiter to complete

 *

 * @rdev: radeon device pointer

 *

 * In case of GPU reset failure make sure no process keep waiting on fence

 * that will never complete.

 */

void radeon_fence_driver_force_completion(struct radeon_device *rdev)

{

	int ring;

	for (ring = 0; ring < RADEON_NUM_RINGS; ring++) {

		if (!rdev->fence_drv[ring].initialized)

			continue;

		radeon_fence_write(rdev, rdev->fence_drv[ring].sync_seq[ring], ring);

	}

}

/*

 * Fence debugfs

 */

#if defined(CONFIG_DEBUG_FS)

static int radeon_debugfs_fence_info(struct seq_file *m, void *data)

{

	struct drm_info_node *node = (struct drm_info_node *)m->private;

	struct drm_device *dev = node->minor->dev;

	struct radeon_device *rdev = dev->dev_private;

	int i, j;

	for (i = 0; i < RADEON_NUM_RINGS; ++i) {

		if (!rdev->fence_drv[i].initialized)

			continue;

		seq_printf(m, "--- ring %d ---\n", i);

		seq_printf(m, "Last signaled fence 0x%016llx\n",

			   (unsigned long long)atomic64_read(&rdev->fence_drv[i].last_seq));

		seq_printf(m, "Last emitted        0x%016llx\n",

			   rdev->fence_drv[i].sync_seq[i]);

		for (j = 0; j < RADEON_NUM_RINGS; ++j) {

			if (i != j && rdev->fence_drv[j].initialized)

				seq_printf(m, "Last sync to ring %d 0x%016llx\n",

					   j, rdev->fence_drv[i].sync_seq[j]);

		}

	}

	return 0;

}

static struct drm_info_list radeon_debugfs_fence_list[] = {

	{"radeon_fence_info", &radeon_debugfs_fence_info, 0, NULL},

};

#endif

int radeon_debugfs_fence_init(struct radeon_device *rdev)

{

#if defined(CONFIG_DEBUG_FS)

	return radeon_debugfs_add_files(rdev, radeon_debugfs_fence_list, 1);

#else

	return 0;

#endif

}