/*
* 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 <linux/ktime.h>
#include <linux/hrtimer.h>
#include <linux/sched/signal.h>
#include <trace/events/dma_fence.h>
#include <nvif/if0020.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);
}
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;
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;
}
static struct nouveau_fence *
nouveau_local_fence(struct dma_fence *fence, struct nouveau_drm *drm)
{
if (fence->ops != &nouveau_fence_ops_legacy &&
fence->ops != &nouveau_fence_ops_uevent)
return NULL;
return from_fence(fence);
}
void
nouveau_fence_context_kill(struct nouveau_fence_chan *fctx, int error)
{
struct nouveau_fence *fence;
unsigned long flags;
spin_lock_irqsave(&fctx->lock, flags);
while (!list_empty(&fctx->pending)) {
fence = list_entry(fctx->pending.next, typeof(*fence), head);
if (error)
dma_fence_set_error(&fence->base, error);
if (nouveau_fence_signal(fence))
nvif_event_block(&fctx->event);
}
fctx->killed = 1;
spin_unlock_irqrestore(&fctx->lock, flags);
}
void
nouveau_fence_context_del(struct nouveau_fence_chan *fctx)
{
cancel_work_sync(&fctx->uevent_work);
nouveau_fence_context_kill(fctx, 0);
nvif_event_dtor(&fctx->event);
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 void
nouveau_fence_uevent_work(struct work_struct *work)
{
struct nouveau_fence_chan *fctx = container_of(work, struct nouveau_fence_chan,
uevent_work);
unsigned long flags;
int drop = 0;
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(chan, fctx))
drop = 1;
}
if (drop)
nvif_event_block(&fctx->event);
spin_unlock_irqrestore(&fctx->lock, flags);
}
static int
nouveau_fence_wait_uevent_handler(struct nvif_event *event, void *repv, u32 repc)
{
struct nouveau_fence_chan *fctx = container_of(event, typeof(*fctx), event);
schedule_work(&fctx->uevent_work);
return NVIF_EVENT_KEEP;
}
void
nouveau_fence_context_new(struct nouveau_channel *chan, struct nouveau_fence_chan *fctx)
{
struct nouveau_cli *cli = chan->cli;
struct nouveau_drm *drm = cli->drm;
struct nouveau_fence_priv *priv = (void*)drm->fence;
struct {
struct nvif_event_v0 base;
struct nvif_chan_event_v0 host;
} args;
int ret;
INIT_WORK(&fctx->uevent_work, nouveau_fence_uevent_work);
INIT_LIST_HEAD(&fctx->flip);
INIT_LIST_HEAD(&fctx->pending);
spin_lock_init(&fctx->lock);
fctx->context = drm->runl[chan->runlist].context_base + chan->chid;
if (chan == drm->cechan)
strcpy(fctx->name, "copy engine channel");
else if (chan == drm->channel)
strcpy(fctx->name, "generic kernel channel");
else
strcpy(fctx->name, cli->name);
kref_init(&fctx->fence_ref);
if (!priv->uevent)
return;
args.host.version = 0;
args.host.type = NVIF_CHAN_EVENT_V0_NON_STALL_INTR;
ret = nvif_event_ctor(&chan->user, "fenceNonStallIntr", (chan->runlist << 16) | chan->chid,
nouveau_fence_wait_uevent_handler, false,
&args.base, sizeof(args), &fctx->event);
WARN_ON(ret);
}
int
nouveau_fence_emit(struct nouveau_fence *fence)
{
struct nouveau_channel *chan = unrcu_pointer(fence->channel);
struct nouveau_fence_chan *fctx = chan->fence;
struct nouveau_fence_priv *priv = (void*)chan->cli->drm->fence;
int ret;
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);
ret = fctx->emit(fence);
if (!ret) {
dma_fence_get(&fence->base);
spin_lock_irq(&fctx->lock);
if (unlikely(fctx->killed)) {
spin_unlock_irq(&fctx->lock);
dma_fence_put(&fence->base);
return -ENODEV;
}
if (nouveau_fence_update(chan, fctx))
nvif_event_block(&fctx->event);
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(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_event_block(&fctx->event);
spin_unlock_irqrestore(&fctx->lock, flags);
}
return dma_fence_is_signaled(&fence->base);
}
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;
}
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 = dma_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 dma_resv *resv = nvbo->bo.base.resv;
int i, ret;
ret = dma_resv_reserve_fences(resv, 1);
if (ret)
return ret;
/* Waiting for the writes first causes performance regressions
* under some circumstances. So manually wait for the reads first.
*/
for (i = 0; i < 2; ++i) {
struct dma_resv_iter cursor;
struct dma_fence *fence;
dma_resv_for_each_fence(&cursor, resv,
dma_resv_usage_rw(exclusive),
fence) {
enum dma_resv_usage usage;
struct nouveau_fence *f;
usage = dma_resv_iter_usage(&cursor);
if (i == 0 && usage == DMA_RESV_USAGE_WRITE)
continue;
f = nouveau_local_fence(fence, chan->cli->drm);
if (f) {
struct nouveau_channel *prev;
bool must_wait = true;
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)
continue;
}
ret = dma_fence_wait(fence, intr);
if (ret)
return ret;
}
}
return 0;
}
void
nouveau_fence_unref(struct nouveau_fence **pfence)
{
if (*pfence)
dma_fence_put(&(*pfence)->base);
*pfence = NULL;
}
int
nouveau_fence_create(struct nouveau_fence **pfence,
struct nouveau_channel *chan)
{
struct nouveau_fence *fence;
if (unlikely(!chan->fence))
return -ENODEV;
fence = kzalloc(sizeof(*fence), GFP_KERNEL);
if (!fence)
return -ENOMEM;
fence->channel = chan;
*pfence = fence;
return 0;
}
int
nouveau_fence_new(struct nouveau_fence **pfence,
struct nouveau_channel *chan)
{
int ret = 0;
ret = nouveau_fence_create(pfence, chan);
if (ret)
return ret;
ret = nouveau_fence_emit(*pfence);
if (ret)
nouveau_fence_unref(pfence);
return ret;
}
static const char *nouveau_fence_get_get_driver_name(struct dma_fence *fence)
{
return "nouveau";
}
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";
}
/*
* 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;
}
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;
}
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);
}
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_event_allow(&fctx->event);
ret = nouveau_fence_no_signaling(f);
if (ret)
set_bit(DMA_FENCE_FLAG_USER_BITS, &fence->base.flags);
else if (!--fctx->notify_ref)
nvif_event_block(&fctx->event);
return ret;
}
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,
.release = nouveau_fence_release
};
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