Release 4.15 drivers/gpu/drm/nouveau/nouveau_fence.c

Directory: drivers/gpu/drm/nouveau
/*
 * Copyright (C) 2007 Ben Skeggs.
 * 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, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) 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.
 *
 */

#include <drm/drmP.h>

#include <linux/ktime.h>
#include <linux/hrtimer.h>
#include <trace/events/dma_fence.h>

#include <nvif/cl826e.h>
#include <nvif/notify.h>
#include <nvif/event.h>

#include "nouveau_drv.h"
#include "nouveau_dma.h"
#include "nouveau_fence.h"


static const struct dma_fence_ops nouveau_fence_ops_uevent;

static const struct dma_fence_ops nouveau_fence_ops_legacy;


static inline struct nouveau_fence *

from_fence(struct dma_fence *fence)
{
	return container_of(fence, struct nouveau_fence, base);
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 19 76.00% 1 33.33%
Ben Skeggs 5 20.00% 1 33.33%
Chris Wilson 1 4.00% 1 33.33%
Total 25 100.00% 3 100.00%


static inline struct nouveau_fence_chan *

nouveau_fctx(struct nouveau_fence *fence)
{
	return container_of(fence->base.lock, struct nouveau_fence_chan, lock);
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 17 58.62% 1 50.00%
Ben Skeggs 12 41.38% 1 50.00%
Total 29 100.00% 2 100.00%


static int

nouveau_fence_signal(struct nouveau_fence *fence)
{
	int drop = 0;

	dma_fence_signal_locked(&fence->base);
	list_del(&fence->head);
	rcu_assign_pointer(fence->channel, NULL);

	if (test_bit(DMA_FENCE_FLAG_USER_BITS, &fence->base.flags)) {
		struct nouveau_fence_chan *fctx = nouveau_fctx(fence);

		if (!--fctx->notify_ref)
			drop = 1;
	}

	dma_fence_put(&fence->base);
	return drop;
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 63 70.00% 2 50.00%
Ben Skeggs 24 26.67% 1 25.00%
Chris Wilson 3 3.33% 1 25.00%
Total 90 100.00% 4 100.00%


static struct nouveau_fence *

nouveau_local_fence(struct dma_fence *fence, struct nouveau_drm *drm) {
	struct nouveau_fence_priv *priv = (void*)drm->fence;

	if (fence->ops != &nouveau_fence_ops_legacy &&
	    fence->ops != &nouveau_fence_ops_uevent)
		return NULL;

	if (fence->context < priv->context_base ||
	    fence->context >= priv->context_base + priv->contexts)
		return NULL;

	return from_fence(fence);
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 80 98.77% 1 50.00%
Chris Wilson 1 1.23% 1 50.00%
Total 81 100.00% 2 100.00%


void

nouveau_fence_context_del(struct nouveau_fence_chan *fctx)
{
	struct nouveau_fence *fence;

	spin_lock_irq(&fctx->lock);
	while (!list_empty(&fctx->pending)) {
		fence = list_entry(fctx->pending.next, typeof(*fence), head);

		if (nouveau_fence_signal(fence))
			nvif_notify_put(&fctx->notify);
	}
	spin_unlock_irq(&fctx->lock);

	nvif_notify_fini(&fctx->notify);
	fctx->dead = 1;

	/*
         * Ensure that all accesses to fence->channel complete before freeing
         * the channel.
         */
	synchronize_rcu();
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 58 60.42% 2 25.00%
Ben Skeggs 27 28.12% 3 37.50%
Francisco Jerez 11 11.46% 3 37.50%
Total 96 100.00% 8 100.00%


static void

nouveau_fence_context_put(struct kref *fence_ref)
{
	kfree(container_of(fence_ref, struct nouveau_fence_chan, fence_ref));
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 23 95.83% 2 66.67%
Ben Skeggs 1 4.17% 1 33.33%
Total 24 100.00% 3 100.00%


void

nouveau_fence_context_free(struct nouveau_fence_chan *fctx)
{
	kref_put(&fctx->fence_ref, nouveau_fence_context_put);
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 20 100.00% 1 100.00%
Total 20 100.00% 1 100.00%


static int

nouveau_fence_update(struct nouveau_channel *chan, struct nouveau_fence_chan *fctx)
{
	struct nouveau_fence *fence;
	int drop = 0;
	u32 seq = fctx->read(chan);

	while (!list_empty(&fctx->pending)) {
		fence = list_entry(fctx->pending.next, typeof(*fence), head);

		if ((int)(seq - fence->base.seqno) < 0)
			break;

		drop |= nouveau_fence_signal(fence);
	}

	return drop;
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 63 65.62% 3 37.50%
Ben Skeggs 33 34.38% 5 62.50%
Total 96 100.00% 8 100.00%


static int

nouveau_fence_wait_uevent_handler(struct nvif_notify *notify)
{
	struct nouveau_fence_chan *fctx =
		container_of(notify, typeof(*fctx), notify);
	unsigned long flags;
	int ret = NVIF_NOTIFY_KEEP;

	spin_lock_irqsave(&fctx->lock, flags);
	if (!list_empty(&fctx->pending)) {
		struct nouveau_fence *fence;
		struct nouveau_channel *chan;

		fence = list_entry(fctx->pending.next, typeof(*fence), head);
		chan = rcu_dereference_protected(fence->channel, lockdep_is_held(&fctx->lock));
		if (nouveau_fence_update(fence->channel, fctx))
			ret = NVIF_NOTIFY_DROP;
	}
	spin_unlock_irqrestore(&fctx->lock, flags);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 85 62.96% 2 66.67%
Ben Skeggs 50 37.04% 1 33.33%
Total 135 100.00% 3 100.00%


void

nouveau_fence_context_new(struct nouveau_channel *chan, struct nouveau_fence_chan *fctx)
{
	struct nouveau_fence_priv *priv = (void*)chan->drm->fence;
	struct nouveau_cli *cli = (void *)chan->user.client;
	int ret;

	INIT_LIST_HEAD(&fctx->flip);
	INIT_LIST_HEAD(&fctx->pending);
	spin_lock_init(&fctx->lock);
	fctx->context = priv->context_base + chan->chid;

	if (chan == chan->drm->cechan)
		strcpy(fctx->name, "copy engine channel");
	else if (chan == chan->drm->channel)
		strcpy(fctx->name, "generic kernel channel");
	else
		strcpy(fctx->name, nvxx_client(&cli->base)->name);

	kref_init(&fctx->fence_ref);
	if (!priv->uevent)
		return;

	ret = nvif_notify_init(&chan->user, nouveau_fence_wait_uevent_handler,
			       false, NV826E_V0_NTFY_NON_STALL_INTERRUPT,
			       &(struct nvif_notify_uevent_req) { },
			       sizeof(struct nvif_notify_uevent_req),
			       sizeof(struct nvif_notify_uevent_rep),
			       &fctx->notify);

	WARN_ON(ret);
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 134 66.34% 2 16.67%
Ben Skeggs 68 33.66% 10 83.33%
Total 202 100.00% 12 100.00%


int

nouveau_fence_emit(struct nouveau_fence *fence, struct nouveau_channel *chan)
{
	struct nouveau_fence_chan *fctx = chan->fence;
	struct nouveau_fence_priv *priv = (void*)chan->drm->fence;
	int ret;

	fence->channel  = chan;
	fence->timeout  = jiffies + (15 * HZ);

	if (priv->uevent)
		dma_fence_init(&fence->base, &nouveau_fence_ops_uevent,
			       &fctx->lock, fctx->context, ++fctx->sequence);
	else
		dma_fence_init(&fence->base, &nouveau_fence_ops_legacy,
			       &fctx->lock, fctx->context, ++fctx->sequence);
	kref_get(&fctx->fence_ref);

	trace_dma_fence_emit(&fence->base);
	ret = fctx->emit(fence);
	if (!ret) {
		dma_fence_get(&fence->base);
		spin_lock_irq(&fctx->lock);

		if (nouveau_fence_update(chan, fctx))
			nvif_notify_put(&fctx->notify);

		list_add_tail(&fence->head, &fctx->pending);
		spin_unlock_irq(&fctx->lock);
	}

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 202 98.06% 4 80.00%
Chris Wilson 4 1.94% 1 20.00%
Total 206 100.00% 5 100.00%


bool

nouveau_fence_done(struct nouveau_fence *fence)
{
	if (fence->base.ops == &nouveau_fence_ops_legacy ||
	    fence->base.ops == &nouveau_fence_ops_uevent) {
		struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
		struct nouveau_channel *chan;
		unsigned long flags;

		if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->base.flags))
			return true;

		spin_lock_irqsave(&fctx->lock, flags);
		chan = rcu_dereference_protected(fence->channel, lockdep_is_held(&fctx->lock));
		if (chan && nouveau_fence_update(chan, fctx))
			nvif_notify_put(&fctx->notify);
		spin_unlock_irqrestore(&fctx->lock, flags);
	}
	return dma_fence_is_signaled(&fence->base);
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 131 98.50% 2 66.67%
Chris Wilson 2 1.50% 1 33.33%
Total 133 100.00% 3 100.00%


static long

nouveau_fence_wait_legacy(struct dma_fence *f, bool intr, long wait)
{
	struct nouveau_fence *fence = from_fence(f);
	unsigned long sleep_time = NSEC_PER_MSEC / 1000;
	unsigned long t = jiffies, timeout = t + wait;

	while (!nouveau_fence_done(fence)) {
		ktime_t kt;

		t = jiffies;

		if (wait != MAX_SCHEDULE_TIMEOUT && time_after_eq(t, timeout)) {
			__set_current_state(TASK_RUNNING);
			return 0;
		}

		__set_current_state(intr ? TASK_INTERRUPTIBLE :
					   TASK_UNINTERRUPTIBLE);

		kt = sleep_time;
		schedule_hrtimeout(&kt, HRTIMER_MODE_REL);
		sleep_time *= 2;
		if (sleep_time > NSEC_PER_MSEC)
			sleep_time = NSEC_PER_MSEC;

		if (intr && signal_pending(current))
			return -ERESTARTSYS;
	}

	__set_current_state(TASK_RUNNING);

	return timeout - t;
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 143 98.62% 1 33.33%
Ben Skeggs 1 0.69% 1 33.33%
Chris Wilson 1 0.69% 1 33.33%
Total 145 100.00% 3 100.00%


static int

nouveau_fence_wait_busy(struct nouveau_fence *fence, bool intr)
{
	int ret = 0;

	while (!nouveau_fence_done(fence)) {
		if (time_after_eq(jiffies, fence->timeout)) {
			ret = -EBUSY;
			break;
		}

		__set_current_state(intr ?
				    TASK_INTERRUPTIBLE :
				    TASK_UNINTERRUPTIBLE);

		if (intr && signal_pending(current)) {
			ret = -ERESTARTSYS;
			break;
		}
	}

	__set_current_state(TASK_RUNNING);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 74 90.24% 1 50.00%
Ben Skeggs 8 9.76% 1 50.00%
Total 82 100.00% 2 100.00%


int

nouveau_fence_wait(struct nouveau_fence *fence, bool lazy, bool intr)
{
	long ret;

	if (!lazy)
		return nouveau_fence_wait_busy(fence, intr);

	ret = dma_fence_wait_timeout(&fence->base, intr, 15 * HZ);
	if (ret < 0)
		return ret;
	else if (!ret)
		return -EBUSY;
	else
		return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 59 83.10% 1 33.33%
Ben Skeggs 11 15.49% 1 33.33%
Chris Wilson 1 1.41% 1 33.33%
Total 71 100.00% 3 100.00%


int

nouveau_fence_sync(struct nouveau_bo *nvbo, struct nouveau_channel *chan, bool exclusive, bool intr)
{
	struct nouveau_fence_chan *fctx = chan->fence;
	struct dma_fence *fence;
	struct reservation_object *resv = nvbo->bo.resv;
	struct reservation_object_list *fobj;
	struct nouveau_fence *f;
	int ret = 0, i;

	if (!exclusive) {
		ret = reservation_object_reserve_shared(resv);

		if (ret)
			return ret;
	}

	fobj = reservation_object_get_list(resv);
	fence = reservation_object_get_excl(resv);

	if (fence && (!exclusive || !fobj || !fobj->shared_count)) {
		struct nouveau_channel *prev = NULL;
		bool must_wait = true;

		f = nouveau_local_fence(fence, chan->drm);
		if (f) {
			rcu_read_lock();
			prev = rcu_dereference(f->channel);
			if (prev && (prev == chan || fctx->sync(f, prev, chan) == 0))
				must_wait = false;
			rcu_read_unlock();
		}

		if (must_wait)
			ret = dma_fence_wait(fence, intr);

		return ret;
	}

	if (!exclusive || !fobj)
		return ret;

	for (i = 0; i < fobj->shared_count && !ret; ++i) {
		struct nouveau_channel *prev = NULL;
		bool must_wait = true;

		fence = rcu_dereference_protected(fobj->shared[i],
						reservation_object_held(resv));

		f = nouveau_local_fence(fence, chan->drm);
		if (f) {
			rcu_read_lock();
			prev = rcu_dereference(f->channel);
			if (prev && (prev == chan || fctx->sync(f, prev, chan) == 0))
				must_wait = false;
			rcu_read_unlock();
		}

		if (must_wait)
			ret = dma_fence_wait(fence, intr);
	}

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 280 82.60% 5 55.56%
Ben Skeggs 56 16.52% 3 33.33%
Chris Wilson 3 0.88% 1 11.11%
Total 339 100.00% 9 100.00%


void

nouveau_fence_unref(struct nouveau_fence **pfence)
{
	if (*pfence)
		dma_fence_put(&(*pfence)->base);
	*pfence = NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 27 84.38% 1 33.33%
Ben Skeggs 4 12.50% 1 33.33%
Chris Wilson 1 3.12% 1 33.33%
Total 32 100.00% 3 100.00%


int

nouveau_fence_new(struct nouveau_channel *chan, bool sysmem,
		  struct nouveau_fence **pfence)
{
	struct nouveau_fence *fence;
	int ret = 0;

	if (unlikely(!chan->fence))
		return -ENODEV;

	fence = kzalloc(sizeof(*fence), GFP_KERNEL);
	if (!fence)
		return -ENOMEM;

	ret = nouveau_fence_emit(fence, chan);
	if (ret)
		nouveau_fence_unref(&fence);

	*pfence = fence;
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 44 47.83% 1 25.00%
Ben Skeggs 39 42.39% 2 50.00%
Francisco Jerez 9 9.78% 1 25.00%
Total 92 100.00% 4 100.00%



static const char *nouveau_fence_get_get_driver_name(struct dma_fence *fence)
{
	return "nouveau";
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 11 68.75% 1 33.33%
Ben Skeggs 4 25.00% 1 33.33%
Chris Wilson 1 6.25% 1 33.33%
Total 16 100.00% 3 100.00%



static const char *nouveau_fence_get_timeline_name(struct dma_fence *f)
{
	struct nouveau_fence *fence = from_fence(f);
	struct nouveau_fence_chan *fctx = nouveau_fctx(fence);

	return !fctx->dead ? fctx->name : "dead channel";
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 30 66.67% 2 33.33%
Ben Skeggs 14 31.11% 3 50.00%
Chris Wilson 1 2.22% 1 16.67%
Total 45 100.00% 6 100.00%

/*
 * In an ideal world, read would not assume the channel context is still alive.
 * This function may be called from another device, running into free memory as a
 * result. The drm node should still be there, so we can derive the index from
 * the fence context.
 */


static bool nouveau_fence_is_signaled(struct dma_fence *f)
{
	struct nouveau_fence *fence = from_fence(f);
	struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
	struct nouveau_channel *chan;
	bool ret = false;

	rcu_read_lock();
	chan = rcu_dereference(fence->channel);
	if (chan)
		ret = (int)(fctx->read(chan) - fence->base.seqno) >= 0;
	rcu_read_unlock();

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 70 82.35% 2 33.33%
Ben Skeggs 14 16.47% 3 50.00%
Chris Wilson 1 1.18% 1 16.67%
Total 85 100.00% 6 100.00%



static bool nouveau_fence_no_signaling(struct dma_fence *f)
{
	struct nouveau_fence *fence = from_fence(f);

	/*
         * caller should have a reference on the fence,
         * else fence could get freed here
         */
	WARN_ON(kref_read(&fence->base.refcount) <= 1);

	/*
         * This needs uevents to work correctly, but dma_fence_add_callback relies on
         * being able to enable signaling. It will still get signaled eventually,
         * just not right away.
         */
	if (nouveau_fence_is_signaled(f)) {
		list_del(&fence->head);

		dma_fence_put(&fence->base);
		return false;
	}

	return true;
}

Contributors
Person Tokens Prop Commits CommitProp
Ben Skeggs 32 46.38% 2 33.33%
Maarten Lankhorst 30 43.48% 1 16.67%
Francisco Jerez 3 4.35% 1 16.67%
Chris Wilson 3 4.35% 1 16.67%
Peter Zijlstra 1 1.45% 1 16.67%
Total 69 100.00% 6 100.00%



static void nouveau_fence_release(struct dma_fence *f)
{
	struct nouveau_fence *fence = from_fence(f);
	struct nouveau_fence_chan *fctx = nouveau_fctx(fence);

	kref_put(&fctx->fence_ref, nouveau_fence_context_put);
	dma_fence_free(&fence->base);
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 47 95.92% 1 50.00%
Chris Wilson 2 4.08% 1 50.00%
Total 49 100.00% 2 100.00%


static const struct dma_fence_ops nouveau_fence_ops_legacy = {
	.get_driver_name = nouveau_fence_get_get_driver_name,
	.get_timeline_name = nouveau_fence_get_timeline_name,
	.enable_signaling = nouveau_fence_no_signaling,
	.signaled = nouveau_fence_is_signaled,
	.wait = nouveau_fence_wait_legacy,
	.release = nouveau_fence_release
};



static bool nouveau_fence_enable_signaling(struct dma_fence *f)
{
	struct nouveau_fence *fence = from_fence(f);
	struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
	bool ret;

	if (!fctx->notify_ref++)
		nvif_notify_get(&fctx->notify);

	ret = nouveau_fence_no_signaling(f);
	if (ret)
		set_bit(DMA_FENCE_FLAG_USER_BITS, &fence->base.flags);
	else if (!--fctx->notify_ref)
		nvif_notify_put(&fctx->notify);

	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 47 50.54% 1 9.09%
Ben Skeggs 36 38.71% 6 54.55%
Vasiliy Kulikov 3 3.23% 1 9.09%
Francisco Jerez 3 3.23% 1 9.09%
Marcin Ślusarz 2 2.15% 1 9.09%
Chris Wilson 2 2.15% 1 9.09%
Total 93 100.00% 11 100.00%


static const struct dma_fence_ops nouveau_fence_ops_uevent = {
	.get_driver_name = nouveau_fence_get_get_driver_name,
	.get_timeline_name = nouveau_fence_get_timeline_name,
	.enable_signaling = nouveau_fence_enable_signaling,
	.signaled = nouveau_fence_is_signaled,
	.wait = dma_fence_default_wait,
	.release = nouveau_fence_release
};
Overall Contributors
Person Tokens Prop Commits CommitProp
Maarten Lankhorst 1837 77.35% 6 15.38%
Ben Skeggs 463 19.49% 21 53.85%
Chris Wilson 33 1.39% 1 2.56%
Francisco Jerez 28 1.18% 6 15.38%
Marcin Ślusarz 8 0.34% 1 2.56%
Vasiliy Kulikov 3 0.13% 1 2.56%
David Howells 1 0.04% 1 2.56%
Lucas Stach 1 0.04% 1 2.56%
Peter Zijlstra 1 0.04% 1 2.56%
Total 2375 100.00% 39 100.00%
Directory: drivers/gpu/drm/nouveau

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Maarten Lankhorst	19	76.00%	1	33.33%
Ben Skeggs	5	20.00%	1	33.33%
Chris Wilson	1	4.00%	1	33.33%
Total	25	100.00%	3	100.00%
cregit-Linux how code gets into the kernel

Release 4.15 drivers/gpu/drm/nouveau/nouveau_fence.c

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