Release 4.11 drivers/gpu/drm/nouveau/nouveau_fence.c

/*
 * 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);
}

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19
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1
33.33%
Ben Skeggs
5
20.00%
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Chris Wilson
1
4.00%
1
33.33%
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25
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static inline struct nouveau_fence_chan *

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

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58.62%
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41.38%
1
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29
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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;
}

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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);
}

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Maarten Lankhorst
80
98.77%
1
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Chris Wilson
1
1.23%
1
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81
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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
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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));
}

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Maarten Lankhorst
23
95.83%
2
66.67%
Ben Skeggs
1
4.17%
1
33.33%
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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);
}

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Maarten Lankhorst
20
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20
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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
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CommitProp
Maarten Lankhorst
65
67.71%
3
37.50%
Ben Skeggs
31
32.29%
5
62.50%
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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;
}

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Maarten Lankhorst
85
62.96%
2
66.67%
Ben Skeggs
50
37.04%
1
33.33%
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135
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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);
}

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Maarten Lankhorst
134
66.34%
2
16.67%
Ben Skeggs
68
33.66%
10
83.33%
Total
202
100.00%
12
100.00%


struct nouveau_fence_work {
	
struct work_struct work;
	
struct dma_fence_cb cb;
	
void (*func)(void *);
	
void *data;
};


static void

nouveau_fence_work_handler(struct work_struct *kwork)
{
	struct nouveau_fence_work *work = container_of(kwork, typeof(*work), work);
	work->func(work->data);
	kfree(work);
}

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Maarten Lankhorst
24
55.81%
1
33.33%
Ben Skeggs
19
44.19%
2
66.67%
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43
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3
100.00%



static void nouveau_fence_work_cb(struct dma_fence *fence, struct dma_fence_cb *cb)
{
	struct nouveau_fence_work *work = container_of(cb, typeof(*work), cb);

	schedule_work(&work->work);
}

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Maarten Lankhorst
38
90.48%
1
33.33%
Chris Wilson
2
4.76%
1
33.33%
Ben Skeggs
2
4.76%
1
33.33%
Total
42
100.00%
3
100.00%


void

nouveau_fence_work(struct dma_fence *fence,
		   void (*func)(void *), void *data)
{
	struct nouveau_fence_work *work;

	if (dma_fence_is_signaled(fence))
		goto err;

	work = kmalloc(sizeof(*work), GFP_KERNEL);
	if (!work) {
		/*
                 * this might not be a nouveau fence any more,
                 * so force a lazy wait here
                 */
		WARN_ON(nouveau_fence_wait((struct nouveau_fence *)fence,
					   true, false));
		goto err;
	}

	INIT_WORK(&work->work, nouveau_fence_work_handler);
	work->func = func;
	work->data = data;

	if (dma_fence_add_callback(fence, &work->cb, nouveau_fence_work_cb) < 0)
		goto err_free;
	return;

err_free:
	kfree(work);
err:
	func(data);
}

Contributors
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Maarten Lankhorst
133
97.79%
3
75.00%
Chris Wilson
3
2.21%
1
25.00%
Total
136
100.00%
4
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;
}

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Maarten Lankhorst
201
97.57%
4
66.67%
Chris Wilson
4
1.94%
1
16.67%
Ben Skeggs
1
0.49%
1
16.67%
Total
206
100.00%
6
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);
}

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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
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Maarten Lankhorst
139
95.86%
1
33.33%
Ben Skeggs
5
3.45%
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
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Maarten Lankhorst
67
81.71%
1
50.00%
Ben Skeggs
15
18.29%
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
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CommitProp
Maarten Lankhorst
69
97.18%
1
33.33%
Chris Wilson
1
1.41%
1
33.33%
Ben Skeggs
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;
}

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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;
}

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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;

	fence->sysmem = sysmem;

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

	*pfence = fence;
	return ret;
}

Contributors
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CommitProp
Maarten Lankhorst
44
44.90%
1
25.00%
Ben Skeggs
41
41.84%
2
50.00%
Francisco Jerez
13
13.27%
1
25.00%
Total
98
100.00%
4
100.00%



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

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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";
}

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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
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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
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Commits
CommitProp
Ben Skeggs
32
46.38%
2
33.33%
Maarten Lankhorst
30
43.48%
1
16.67%
Chris Wilson
3
4.35%
1
16.67%
Francisco Jerez
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%
Francisco Jerez
3
3.23%
1
9.09%
Vasiliy Kulikov
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
2050
77.98%
7
17.50%
Ben Skeggs
494
18.79%
21
52.50%
Chris Wilson
39
1.48%
1
2.50%
Francisco Jerez
32
1.22%
6
15.00%
Marcin Ślusarz
8
0.30%
1
2.50%
Vasiliy Kulikov
3
0.11%
1
2.50%
David Howells
1
0.04%
1
2.50%
Peter Zijlstra
1
0.04%
1
2.50%
Lucas Stach
1
0.04%
1
2.50%
Total
2629
100.00%
40
100.00%
Directory: drivers/gpu/drm/nouveau

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