- 根目录:
- 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/fence.h>
#include <nvif/notify.h>
#include <nvif/event.h>
#include "nouveau_drm.h"
#include "nouveau_dma.h"
#include "nouveau_fence.h"
static const struct fence_ops nouveau_fence_ops_uevent;
static const struct fence_ops nouveau_fence_ops_legacy;
static inline struct nouveau_fence *
from_fence(struct fence *fence)
{
return container_of(fence, struct nouveau_fence, base);
}
static inline struct nouveau_fence_chan *
nouveau_fctx(struct nouveau_fence *fence)
{
return container_of(fence->base.lock, struct nouveau_fence_chan, lock);
}
static int
nouveau_fence_signal(struct nouveau_fence *fence)
{
int drop = 0;
fence_signal_locked(&fence->base);
list_del(&fence->head);
rcu_assign_pointer(fence->channel, NULL);
if (test_bit(FENCE_FLAG_USER_BITS, &fence->base.flags)) {
struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
if (!--fctx->notify_ref)
drop = 1;
}
fence_put(&fence->base);
return drop;
}
static struct nouveau_fence *
nouveau_local_fence(struct 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);
}
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();
}
static void
nouveau_fence_context_put(struct kref *fence_ref)
{
kfree(container_of(fence_ref, struct nouveau_fence_chan, fence_ref));
}
void
nouveau_fence_context_free(struct nouveau_fence_chan *fctx)
{
kref_put(&fctx->fence_ref, nouveau_fence_context_put);
}
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;
}
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;
}
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 *)nvif_client(chan->object);
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->object, NULL,
nouveau_fence_wait_uevent_handler, false,
G82_CHANNEL_DMA_V0_NTFY_UEVENT,
&(struct nvif_notify_uevent_req) { },
sizeof(struct nvif_notify_uevent_req),
sizeof(struct nvif_notify_uevent_rep),
&fctx->notify);
WARN_ON(ret);
}
struct nouveau_fence_work {
struct work_struct work;
struct 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);
}
static void nouveau_fence_work_cb(struct fence *fence, struct fence_cb *cb)
{
struct nouveau_fence_work *work = container_of(cb, typeof(*work), cb);
schedule_work(&work->work);
}
void
nouveau_fence_work(struct fence *fence,
void (*func)(void *), void *data)
{
struct nouveau_fence_work *work;
if (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 (fence_add_callback(fence, &work->cb, nouveau_fence_work_cb) < 0)
goto err_free;
return;
err_free:
kfree(work);
err:
func(data);
}
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)
fence_init(&fence->base, &nouveau_fence_ops_uevent,
&fctx->lock, fctx->context, ++fctx->sequence);
else
fence_init(&fence->base, &nouveau_fence_ops_legacy,
&fctx->lock, fctx->context, ++fctx->sequence);
kref_get(&fctx->fence_ref);
trace_fence_emit(&fence->base);
ret = fctx->emit(fence);
if (!ret) {
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;
}
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(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 fence_is_signaled(&fence->base);
}
static long
nouveau_fence_wait_legacy(struct 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 = ktime_set(0, 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;
}
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;
}
int
nouveau_fence_wait(struct nouveau_fence *fence, bool lazy, bool intr)
{
long ret;
if (!lazy)
return nouveau_fence_wait_busy(fence, intr);
ret = fence_wait_timeout(&fence->base, intr, 15 * HZ);
if (ret < 0)
return ret;
else if (!ret)
return -EBUSY;
else
return 0;
}
int
nouveau_fence_sync(struct nouveau_bo *nvbo, struct nouveau_channel *chan, bool exclusive, bool intr)
{
struct nouveau_fence_chan *fctx = chan->fence;
struct 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 = 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 = fence_wait(fence, intr);
}
return ret;
}
void
nouveau_fence_unref(struct nouveau_fence **pfence)
{
if (*pfence)
fence_put(&(*pfence)->base);
*pfence = NULL;
}
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;
}
static const char *nouveau_fence_get_get_driver_name(struct fence *fence)
{
return "nouveau";
}
static const char *nouveau_fence_get_timeline_name(struct fence *f)
{
struct nouveau_fence *fence = from_fence(f);
struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
return !fctx->dead ? fctx->name : "dead channel";
}
/*
* 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 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;
}
static bool nouveau_fence_no_signaling(struct 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(atomic_read(&fence->base.refcount.refcount) <= 1);
/*
* This needs uevents to work correctly, but 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);
fence_put(&fence->base);
return false;
}
return true;
}
static void nouveau_fence_release(struct 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);
fence_free(&fence->base);
}
static const struct 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 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(FENCE_FLAG_USER_BITS, &fence->base.flags);
else if (!--fctx->notify_ref)
nvif_notify_put(&fctx->notify);
return ret;
}
static const struct 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 = fence_default_wait,
.release = NULL
};