linux/drivers/gpu/drm/nouveau/nouveau_fence.c
Ben Skeggs 8e8832e8a8 drm/nouveau/core: allow event source to handle multiple event types per index
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
2014-06-11 16:09:13 +10:00

339 lines
7.5 KiB
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 "nouveau_drm.h"
#include "nouveau_dma.h"
#include "nouveau_fence.h"
#include <engine/fifo.h>
struct fence_work {
struct work_struct base;
struct list_head head;
void (*func)(void *);
void *data;
};
static void
nouveau_fence_signal(struct nouveau_fence *fence)
{
struct fence_work *work, *temp;
list_for_each_entry_safe(work, temp, &fence->work, head) {
schedule_work(&work->base);
list_del(&work->head);
}
fence->channel = NULL;
list_del(&fence->head);
}
void
nouveau_fence_context_del(struct nouveau_fence_chan *fctx)
{
struct nouveau_fence *fence, *fnext;
spin_lock(&fctx->lock);
list_for_each_entry_safe(fence, fnext, &fctx->pending, head) {
nouveau_fence_signal(fence);
}
spin_unlock(&fctx->lock);
}
void
nouveau_fence_context_new(struct nouveau_fence_chan *fctx)
{
INIT_LIST_HEAD(&fctx->flip);
INIT_LIST_HEAD(&fctx->pending);
spin_lock_init(&fctx->lock);
}
static void
nouveau_fence_work_handler(struct work_struct *kwork)
{
struct fence_work *work = container_of(kwork, typeof(*work), base);
work->func(work->data);
kfree(work);
}
void
nouveau_fence_work(struct nouveau_fence *fence,
void (*func)(void *), void *data)
{
struct nouveau_channel *chan = fence->channel;
struct nouveau_fence_chan *fctx;
struct fence_work *work = NULL;
if (nouveau_fence_done(fence)) {
func(data);
return;
}
fctx = chan->fence;
work = kmalloc(sizeof(*work), GFP_KERNEL);
if (!work) {
WARN_ON(nouveau_fence_wait(fence, false, false));
func(data);
return;
}
spin_lock(&fctx->lock);
if (!fence->channel) {
spin_unlock(&fctx->lock);
kfree(work);
func(data);
return;
}
INIT_WORK(&work->base, nouveau_fence_work_handler);
work->func = func;
work->data = data;
list_add(&work->head, &fence->work);
spin_unlock(&fctx->lock);
}
static void
nouveau_fence_update(struct nouveau_channel *chan)
{
struct nouveau_fence_chan *fctx = chan->fence;
struct nouveau_fence *fence, *fnext;
spin_lock(&fctx->lock);
list_for_each_entry_safe(fence, fnext, &fctx->pending, head) {
if (fctx->read(chan) < fence->sequence)
break;
nouveau_fence_signal(fence);
nouveau_fence_unref(&fence);
}
spin_unlock(&fctx->lock);
}
int
nouveau_fence_emit(struct nouveau_fence *fence, struct nouveau_channel *chan)
{
struct nouveau_fence_chan *fctx = chan->fence;
int ret;
fence->channel = chan;
fence->timeout = jiffies + (15 * HZ);
fence->sequence = ++fctx->sequence;
ret = fctx->emit(fence);
if (!ret) {
kref_get(&fence->kref);
spin_lock(&fctx->lock);
list_add_tail(&fence->head, &fctx->pending);
spin_unlock(&fctx->lock);
}
return ret;
}
bool
nouveau_fence_done(struct nouveau_fence *fence)
{
if (fence->channel)
nouveau_fence_update(fence->channel);
return !fence->channel;
}
static int
nouveau_fence_wait_uevent_handler(void *data, u32 type, int index)
{
struct nouveau_fence_priv *priv = data;
wake_up_all(&priv->waiting);
return NVKM_EVENT_KEEP;
}
static int
nouveau_fence_wait_uevent(struct nouveau_fence *fence, bool intr)
{
struct nouveau_channel *chan = fence->channel;
struct nouveau_fifo *pfifo = nouveau_fifo(chan->drm->device);
struct nouveau_fence_priv *priv = chan->drm->fence;
struct nouveau_eventh *handler;
int ret = 0;
ret = nouveau_event_new(pfifo->uevent, 1, 0,
nouveau_fence_wait_uevent_handler,
priv, &handler);
if (ret)
return ret;
nouveau_event_get(handler);
if (fence->timeout) {
unsigned long timeout = fence->timeout - jiffies;
if (time_before(jiffies, fence->timeout)) {
if (intr) {
ret = wait_event_interruptible_timeout(
priv->waiting,
nouveau_fence_done(fence),
timeout);
} else {
ret = wait_event_timeout(priv->waiting,
nouveau_fence_done(fence),
timeout);
}
}
if (ret >= 0) {
fence->timeout = jiffies + ret;
if (time_after_eq(jiffies, fence->timeout))
ret = -EBUSY;
}
} else {
if (intr) {
ret = wait_event_interruptible(priv->waiting,
nouveau_fence_done(fence));
} else {
wait_event(priv->waiting, nouveau_fence_done(fence));
}
}
nouveau_event_ref(NULL, &handler);
if (unlikely(ret < 0))
return ret;
return 0;
}
int
nouveau_fence_wait(struct nouveau_fence *fence, bool lazy, bool intr)
{
struct nouveau_channel *chan = fence->channel;
struct nouveau_fence_priv *priv = chan ? chan->drm->fence : NULL;
unsigned long sleep_time = NSEC_PER_MSEC / 1000;
ktime_t t;
int ret = 0;
while (priv && priv->uevent && lazy && !nouveau_fence_done(fence)) {
ret = nouveau_fence_wait_uevent(fence, intr);
if (ret < 0)
return ret;
}
while (!nouveau_fence_done(fence)) {
if (fence->timeout && time_after_eq(jiffies, fence->timeout)) {
ret = -EBUSY;
break;
}
__set_current_state(intr ? TASK_INTERRUPTIBLE :
TASK_UNINTERRUPTIBLE);
if (lazy) {
t = ktime_set(0, sleep_time);
schedule_hrtimeout(&t, HRTIMER_MODE_REL);
sleep_time *= 2;
if (sleep_time > NSEC_PER_MSEC)
sleep_time = NSEC_PER_MSEC;
}
if (intr && signal_pending(current)) {
ret = -ERESTARTSYS;
break;
}
}
__set_current_state(TASK_RUNNING);
return ret;
}
int
nouveau_fence_sync(struct nouveau_fence *fence, struct nouveau_channel *chan)
{
struct nouveau_fence_chan *fctx = chan->fence;
struct nouveau_channel *prev;
int ret = 0;
prev = fence ? fence->channel : NULL;
if (prev) {
if (unlikely(prev != chan && !nouveau_fence_done(fence))) {
ret = fctx->sync(fence, prev, chan);
if (unlikely(ret))
ret = nouveau_fence_wait(fence, true, false);
}
}
return ret;
}
static void
nouveau_fence_del(struct kref *kref)
{
struct nouveau_fence *fence = container_of(kref, typeof(*fence), kref);
kfree(fence);
}
void
nouveau_fence_unref(struct nouveau_fence **pfence)
{
if (*pfence)
kref_put(&(*pfence)->kref, nouveau_fence_del);
*pfence = NULL;
}
struct nouveau_fence *
nouveau_fence_ref(struct nouveau_fence *fence)
{
if (fence)
kref_get(&fence->kref);
return fence;
}
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;
INIT_LIST_HEAD(&fence->work);
fence->sysmem = sysmem;
kref_init(&fence->kref);
ret = nouveau_fence_emit(fence, chan);
if (ret)
nouveau_fence_unref(&fence);
*pfence = fence;
return ret;
}