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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 "drmP.h"

#include "drm.h"

#include "radeon_reg.h"

#include "radeon.h"

int radeon_fence_emit(struct radeon_device *rdev, struct radeon_fence *fence)

{

	unsigned long irq_flags;

	write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);

	if (fence->emited) {

		write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);

		return 0;

	}

	fence->seq = atomic_add_return(1, &rdev->fence_drv.seq);

	if (!rdev->cp.ready) {

		/* FIXME: cp is not running assume everythings is done right

		 * away

		 */

		WREG32(rdev->fence_drv.scratch_reg, fence->seq);

	} else

		radeon_fence_ring_emit(rdev, fence);

	fence->emited = true;

	list_del(&fence->list);

	list_add_tail(&fence->list, &rdev->fence_drv.emited);

	write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);

	return 0;

}

static bool radeon_fence_poll_locked(struct radeon_device *rdev)

{

	struct radeon_fence *fence;

	struct list_head *i, *n;

	uint32_t seq;

	bool wake = false;

	unsigned long cjiffies;

	if (rdev->wb.enabled) {

		u32 scratch_index;

		if (rdev->wb.use_event)

			scratch_index = R600_WB_EVENT_OFFSET + rdev->fence_drv.scratch_reg - rdev->scratch.reg_base;

		else

			scratch_index = RADEON_WB_SCRATCH_OFFSET + rdev->fence_drv.scratch_reg - rdev->scratch.reg_base;

		seq = rdev->wb.wb[scratch_index/4];

	} else

	seq = RREG32(rdev->fence_drv.scratch_reg);

	if (seq != rdev->fence_drv.last_seq) {

		rdev->fence_drv.last_seq = seq;

		rdev->fence_drv.last_jiffies = jiffies;

		rdev->fence_drv.last_timeout = RADEON_FENCE_JIFFIES_TIMEOUT;

	} else {

		cjiffies = jiffies;

		if (time_after(cjiffies, rdev->fence_drv.last_jiffies)) {

			cjiffies -= rdev->fence_drv.last_jiffies;

			if (time_after(rdev->fence_drv.last_timeout, cjiffies)) {

				/* update the timeout */

				rdev->fence_drv.last_timeout -= cjiffies;

			} else {

				/* the 500ms timeout is elapsed we should test

				 * for GPU lockup

				 */

				rdev->fence_drv.last_timeout = 1;

			}

		} else {

			/* wrap around update last jiffies, we will just wait

			 * a little longer

			 */

			rdev->fence_drv.last_jiffies = cjiffies;

	}

		return false;

	}

	n = NULL;

	list_for_each(i, &rdev->fence_drv.emited) {

		fence = list_entry(i, struct radeon_fence, list);

		if (fence->seq == seq) {

			n = i;

			break;

		}

	}

	/* all fence previous to this one are considered as signaled */

	if (n) {

		i = n;

		do {

			n = i->prev;

			list_del(i);

			list_add_tail(i, &rdev->fence_drv.signaled);

			fence = list_entry(i, struct radeon_fence, list);

			fence->signaled = true;

			i = n;

		} while (i != &rdev->fence_drv.emited);

		wake = true;

	}

	return wake;

}

static void radeon_fence_destroy(struct kref *kref)

{

	unsigned long irq_flags;

        struct radeon_fence *fence;

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

	write_lock_irqsave(&fence->rdev->fence_drv.lock, irq_flags);

	list_del(&fence->list);

	fence->emited = false;

	write_unlock_irqrestore(&fence->rdev->fence_drv.lock, irq_flags);

	kfree(fence);

}

int radeon_fence_create(struct radeon_device *rdev, struct radeon_fence **fence)

{

	unsigned long irq_flags;

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

	if ((*fence) == NULL) {

		return -ENOMEM;

	}

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

	(*fence)->rdev = rdev;

	(*fence)->emited = false;

	(*fence)->signaled = false;

	(*fence)->seq = 0;

	INIT_LIST_HEAD(&(*fence)->list);

	write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);

	list_add_tail(&(*fence)->list, &rdev->fence_drv.created);

	write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);

	return 0;

}

bool radeon_fence_signaled(struct radeon_fence *fence)

{

	unsigned long irq_flags;

	bool signaled = false;

	if (!fence)

		return true;

	if (fence->rdev->gpu_lockup)

		return true;

	write_lock_irqsave(&fence->rdev->fence_drv.lock, irq_flags);

	signaled = fence->signaled;

	/* if we are shuting down report all fence as signaled */

	if (fence->rdev->shutdown) {

		signaled = true;

	}

	if (!fence->emited) {

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

		signaled = true;

	}

	if (!signaled) {

		radeon_fence_poll_locked(fence->rdev);

		signaled = fence->signaled;

	}

	write_unlock_irqrestore(&fence->rdev->fence_drv.lock, irq_flags);

	return signaled;

}

int radeon_fence_wait(struct radeon_fence *fence, bool intr)

{

	struct radeon_device *rdev;

	unsigned long irq_flags, timeout;

	u32 seq;

	int r;

	if (fence == NULL) {

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

		return 0;

	}

	rdev = fence->rdev;

	if (radeon_fence_signaled(fence)) {

		return 0;

	}

	timeout = rdev->fence_drv.last_timeout;

retry:

	/* save current sequence used to check for GPU lockup */

	seq = rdev->fence_drv.last_seq;

	if (intr) {

		radeon_irq_kms_sw_irq_get(rdev);

		r = wait_event_interruptible_timeout(rdev->fence_drv.queue,

				radeon_fence_signaled(fence), timeout);

		radeon_irq_kms_sw_irq_put(rdev);

		if (unlikely(r < 0)) {

			return r;

		}

	} else {

		radeon_irq_kms_sw_irq_get(rdev);

		r = wait_event_timeout(rdev->fence_drv.queue,

			 radeon_fence_signaled(fence), timeout);

		radeon_irq_kms_sw_irq_put(rdev);

	}

	if (unlikely(!radeon_fence_signaled(fence))) {

		/* we were interrupted for some reason and fence isn't

		 * isn't signaled yet, resume wait

		 */

		if (r) {

			timeout = r;

			goto retry;

		}

		/* don't protect read access to rdev->fence_drv.last_seq

		 * if we experiencing a lockup the value doesn't change

		 */

		if (seq == rdev->fence_drv.last_seq && radeon_gpu_is_lockup(rdev)) {

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

			WARN(1, "GPU lockup (waiting for 0x%08X last fence id 0x%08X)\n",

			     fence->seq, seq);

			/* FIXME: what should we do ? marking everyone

			 * as signaled for now

			 */

			rdev->gpu_lockup = true;

			r = radeon_gpu_reset(rdev);

			if (r)

				return r;

				WREG32(rdev->fence_drv.scratch_reg, fence->seq);

			rdev->gpu_lockup = false;

			}

		timeout = RADEON_FENCE_JIFFIES_TIMEOUT;

		write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);

		rdev->fence_drv.last_timeout = RADEON_FENCE_JIFFIES_TIMEOUT;

		rdev->fence_drv.last_jiffies = jiffies;

		write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);

		goto retry;

	}

	return 0;

}

int radeon_fence_wait_next(struct radeon_device *rdev)

{

	unsigned long irq_flags;

	struct radeon_fence *fence;

	int r;

	if (rdev->gpu_lockup) {

		return 0;

	}

	write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);

	if (list_empty(&rdev->fence_drv.emited)) {

		write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);

		return 0;

	}

	fence = list_entry(rdev->fence_drv.emited.next,

			   struct radeon_fence, list);

	radeon_fence_ref(fence);

	write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);

	r = radeon_fence_wait(fence, false);

	radeon_fence_unref(&fence);

	return r;

}

int radeon_fence_wait_last(struct radeon_device *rdev)

{

	unsigned long irq_flags;

	struct radeon_fence *fence;

	int r;

	if (rdev->gpu_lockup) {

		return 0;

	}

	write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);

	if (list_empty(&rdev->fence_drv.emited)) {

		write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);

		return 0;

	}

	fence = list_entry(rdev->fence_drv.emited.prev,

			   struct radeon_fence, list);

	radeon_fence_ref(fence);

	write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);

	r = radeon_fence_wait(fence, false);

	radeon_fence_unref(&fence);

	return r;

}

struct radeon_fence *radeon_fence_ref(struct radeon_fence *fence)

{

	kref_get(&fence->kref);

	return fence;

}

void radeon_fence_unref(struct radeon_fence **fence)

{

	struct radeon_fence *tmp = *fence;

	*fence = NULL;

	if (tmp) {

		kref_put(&tmp->kref, &radeon_fence_destroy);

	}

}

void radeon_fence_process(struct radeon_device *rdev)

{

	unsigned long irq_flags;

	bool wake;

	write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);

	wake = radeon_fence_poll_locked(rdev);

	write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);

	if (wake) {

		wake_up_all(&rdev->fence_drv.queue);

	}

}

int radeon_fence_driver_init(struct radeon_device *rdev)

{

	unsigned long irq_flags;

	int r;

	write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);

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

	if (r) {

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

		write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);

		return r;

	}

	WREG32(rdev->fence_drv.scratch_reg, 0);

	atomic_set(&rdev->fence_drv.seq, 0);

	INIT_LIST_HEAD(&rdev->fence_drv.created);

	INIT_LIST_HEAD(&rdev->fence_drv.emited);

	INIT_LIST_HEAD(&rdev->fence_drv.signaled);

	init_waitqueue_head(&rdev->fence_drv.queue);

	rdev->fence_drv.initialized = true;

	write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);

	if (radeon_debugfs_fence_init(rdev)) {

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

	}

	return 0;

}

void radeon_fence_driver_fini(struct radeon_device *rdev)

{

	unsigned long irq_flags;

	if (!rdev->fence_drv.initialized)

		return;

	wake_up_all(&rdev->fence_drv.queue);

	write_lock_irqsave(&rdev->fence_drv.lock, irq_flags);

	radeon_scratch_free(rdev, rdev->fence_drv.scratch_reg);

	write_unlock_irqrestore(&rdev->fence_drv.lock, irq_flags);

	rdev->fence_drv.initialized = false;

}

/*

 * 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;

	struct radeon_fence *fence;

	seq_printf(m, "Last signaled fence 0x%08X\n",

		   RREG32(rdev->fence_drv.scratch_reg));

	if (!list_empty(&rdev->fence_drv.emited)) {

		   fence = list_entry(rdev->fence_drv.emited.prev,

				      struct radeon_fence, list);

		   seq_printf(m, "Last emited fence %p with 0x%08X\n",

			      fence,  fence->seq);

	}

	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

}