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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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532 lines
13 KiB
C
532 lines
13 KiB
C
/*
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* Copyright (C) 2007 Ben Skeggs.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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#include <drm/drmP.h>
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#include <linux/ktime.h>
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#include <linux/hrtimer.h>
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#include <trace/events/dma_fence.h>
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#include <nvif/cl826e.h>
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#include <nvif/notify.h>
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#include <nvif/event.h>
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#include "nouveau_drv.h"
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#include "nouveau_dma.h"
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#include "nouveau_fence.h"
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static const struct dma_fence_ops nouveau_fence_ops_uevent;
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static const struct dma_fence_ops nouveau_fence_ops_legacy;
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static inline struct nouveau_fence *
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from_fence(struct dma_fence *fence)
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{
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return container_of(fence, struct nouveau_fence, base);
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}
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static inline struct nouveau_fence_chan *
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nouveau_fctx(struct nouveau_fence *fence)
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{
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return container_of(fence->base.lock, struct nouveau_fence_chan, lock);
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}
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static int
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nouveau_fence_signal(struct nouveau_fence *fence)
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{
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int drop = 0;
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dma_fence_signal_locked(&fence->base);
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list_del(&fence->head);
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rcu_assign_pointer(fence->channel, NULL);
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if (test_bit(DMA_FENCE_FLAG_USER_BITS, &fence->base.flags)) {
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struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
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if (!--fctx->notify_ref)
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drop = 1;
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}
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dma_fence_put(&fence->base);
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return drop;
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}
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static struct nouveau_fence *
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nouveau_local_fence(struct dma_fence *fence, struct nouveau_drm *drm) {
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struct nouveau_fence_priv *priv = (void*)drm->fence;
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if (fence->ops != &nouveau_fence_ops_legacy &&
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fence->ops != &nouveau_fence_ops_uevent)
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return NULL;
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if (fence->context < priv->context_base ||
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fence->context >= priv->context_base + priv->contexts)
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return NULL;
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return from_fence(fence);
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}
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void
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nouveau_fence_context_del(struct nouveau_fence_chan *fctx)
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{
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struct nouveau_fence *fence;
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spin_lock_irq(&fctx->lock);
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while (!list_empty(&fctx->pending)) {
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fence = list_entry(fctx->pending.next, typeof(*fence), head);
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if (nouveau_fence_signal(fence))
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nvif_notify_put(&fctx->notify);
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}
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spin_unlock_irq(&fctx->lock);
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nvif_notify_fini(&fctx->notify);
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fctx->dead = 1;
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/*
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* Ensure that all accesses to fence->channel complete before freeing
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* the channel.
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*/
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synchronize_rcu();
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}
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static void
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nouveau_fence_context_put(struct kref *fence_ref)
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{
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kfree(container_of(fence_ref, struct nouveau_fence_chan, fence_ref));
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}
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void
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nouveau_fence_context_free(struct nouveau_fence_chan *fctx)
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{
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kref_put(&fctx->fence_ref, nouveau_fence_context_put);
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}
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static int
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nouveau_fence_update(struct nouveau_channel *chan, struct nouveau_fence_chan *fctx)
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{
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struct nouveau_fence *fence;
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int drop = 0;
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u32 seq = fctx->read(chan);
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while (!list_empty(&fctx->pending)) {
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fence = list_entry(fctx->pending.next, typeof(*fence), head);
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if ((int)(seq - fence->base.seqno) < 0)
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break;
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drop |= nouveau_fence_signal(fence);
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}
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return drop;
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}
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static int
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nouveau_fence_wait_uevent_handler(struct nvif_notify *notify)
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{
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struct nouveau_fence_chan *fctx =
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container_of(notify, typeof(*fctx), notify);
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unsigned long flags;
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int ret = NVIF_NOTIFY_KEEP;
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spin_lock_irqsave(&fctx->lock, flags);
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if (!list_empty(&fctx->pending)) {
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struct nouveau_fence *fence;
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struct nouveau_channel *chan;
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fence = list_entry(fctx->pending.next, typeof(*fence), head);
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chan = rcu_dereference_protected(fence->channel, lockdep_is_held(&fctx->lock));
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if (nouveau_fence_update(fence->channel, fctx))
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ret = NVIF_NOTIFY_DROP;
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}
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spin_unlock_irqrestore(&fctx->lock, flags);
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return ret;
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}
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void
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nouveau_fence_context_new(struct nouveau_channel *chan, struct nouveau_fence_chan *fctx)
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{
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struct nouveau_fence_priv *priv = (void*)chan->drm->fence;
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struct nouveau_cli *cli = (void *)chan->user.client;
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int ret;
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INIT_LIST_HEAD(&fctx->flip);
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INIT_LIST_HEAD(&fctx->pending);
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spin_lock_init(&fctx->lock);
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fctx->context = priv->context_base + chan->chid;
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if (chan == chan->drm->cechan)
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strcpy(fctx->name, "copy engine channel");
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else if (chan == chan->drm->channel)
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strcpy(fctx->name, "generic kernel channel");
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else
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strcpy(fctx->name, nvxx_client(&cli->base)->name);
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kref_init(&fctx->fence_ref);
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if (!priv->uevent)
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return;
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ret = nvif_notify_init(&chan->user, nouveau_fence_wait_uevent_handler,
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false, NV826E_V0_NTFY_NON_STALL_INTERRUPT,
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&(struct nvif_notify_uevent_req) { },
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sizeof(struct nvif_notify_uevent_req),
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sizeof(struct nvif_notify_uevent_rep),
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&fctx->notify);
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WARN_ON(ret);
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}
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int
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nouveau_fence_emit(struct nouveau_fence *fence, struct nouveau_channel *chan)
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{
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struct nouveau_fence_chan *fctx = chan->fence;
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struct nouveau_fence_priv *priv = (void*)chan->drm->fence;
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int ret;
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fence->channel = chan;
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fence->timeout = jiffies + (15 * HZ);
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if (priv->uevent)
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dma_fence_init(&fence->base, &nouveau_fence_ops_uevent,
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&fctx->lock, fctx->context, ++fctx->sequence);
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else
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dma_fence_init(&fence->base, &nouveau_fence_ops_legacy,
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&fctx->lock, fctx->context, ++fctx->sequence);
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kref_get(&fctx->fence_ref);
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trace_dma_fence_emit(&fence->base);
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ret = fctx->emit(fence);
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if (!ret) {
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dma_fence_get(&fence->base);
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spin_lock_irq(&fctx->lock);
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if (nouveau_fence_update(chan, fctx))
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nvif_notify_put(&fctx->notify);
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list_add_tail(&fence->head, &fctx->pending);
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spin_unlock_irq(&fctx->lock);
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}
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return ret;
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}
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bool
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nouveau_fence_done(struct nouveau_fence *fence)
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{
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if (fence->base.ops == &nouveau_fence_ops_legacy ||
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fence->base.ops == &nouveau_fence_ops_uevent) {
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struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
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struct nouveau_channel *chan;
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unsigned long flags;
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if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->base.flags))
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return true;
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spin_lock_irqsave(&fctx->lock, flags);
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chan = rcu_dereference_protected(fence->channel, lockdep_is_held(&fctx->lock));
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if (chan && nouveau_fence_update(chan, fctx))
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nvif_notify_put(&fctx->notify);
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spin_unlock_irqrestore(&fctx->lock, flags);
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}
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return dma_fence_is_signaled(&fence->base);
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}
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static long
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nouveau_fence_wait_legacy(struct dma_fence *f, bool intr, long wait)
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{
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struct nouveau_fence *fence = from_fence(f);
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unsigned long sleep_time = NSEC_PER_MSEC / 1000;
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unsigned long t = jiffies, timeout = t + wait;
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while (!nouveau_fence_done(fence)) {
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ktime_t kt;
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t = jiffies;
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if (wait != MAX_SCHEDULE_TIMEOUT && time_after_eq(t, timeout)) {
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__set_current_state(TASK_RUNNING);
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return 0;
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}
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__set_current_state(intr ? TASK_INTERRUPTIBLE :
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TASK_UNINTERRUPTIBLE);
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kt = sleep_time;
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schedule_hrtimeout(&kt, HRTIMER_MODE_REL);
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sleep_time *= 2;
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if (sleep_time > NSEC_PER_MSEC)
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sleep_time = NSEC_PER_MSEC;
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if (intr && signal_pending(current))
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return -ERESTARTSYS;
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}
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__set_current_state(TASK_RUNNING);
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return timeout - t;
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}
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static int
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nouveau_fence_wait_busy(struct nouveau_fence *fence, bool intr)
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{
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int ret = 0;
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while (!nouveau_fence_done(fence)) {
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if (time_after_eq(jiffies, fence->timeout)) {
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ret = -EBUSY;
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break;
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}
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__set_current_state(intr ?
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TASK_INTERRUPTIBLE :
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TASK_UNINTERRUPTIBLE);
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if (intr && signal_pending(current)) {
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ret = -ERESTARTSYS;
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break;
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}
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}
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__set_current_state(TASK_RUNNING);
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return ret;
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}
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int
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nouveau_fence_wait(struct nouveau_fence *fence, bool lazy, bool intr)
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{
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long ret;
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if (!lazy)
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return nouveau_fence_wait_busy(fence, intr);
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ret = dma_fence_wait_timeout(&fence->base, intr, 15 * HZ);
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if (ret < 0)
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return ret;
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else if (!ret)
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return -EBUSY;
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else
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return 0;
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}
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int
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nouveau_fence_sync(struct nouveau_bo *nvbo, struct nouveau_channel *chan, bool exclusive, bool intr)
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{
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struct nouveau_fence_chan *fctx = chan->fence;
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struct dma_fence *fence;
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struct reservation_object *resv = nvbo->bo.resv;
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struct reservation_object_list *fobj;
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struct nouveau_fence *f;
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int ret = 0, i;
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if (!exclusive) {
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ret = reservation_object_reserve_shared(resv);
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if (ret)
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return ret;
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}
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fobj = reservation_object_get_list(resv);
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fence = reservation_object_get_excl(resv);
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if (fence && (!exclusive || !fobj || !fobj->shared_count)) {
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struct nouveau_channel *prev = NULL;
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bool must_wait = true;
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f = nouveau_local_fence(fence, chan->drm);
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if (f) {
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rcu_read_lock();
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prev = rcu_dereference(f->channel);
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if (prev && (prev == chan || fctx->sync(f, prev, chan) == 0))
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must_wait = false;
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rcu_read_unlock();
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}
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if (must_wait)
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ret = dma_fence_wait(fence, intr);
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return ret;
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}
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if (!exclusive || !fobj)
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return ret;
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for (i = 0; i < fobj->shared_count && !ret; ++i) {
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struct nouveau_channel *prev = NULL;
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bool must_wait = true;
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fence = rcu_dereference_protected(fobj->shared[i],
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reservation_object_held(resv));
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f = nouveau_local_fence(fence, chan->drm);
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if (f) {
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rcu_read_lock();
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prev = rcu_dereference(f->channel);
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if (prev && (prev == chan || fctx->sync(f, prev, chan) == 0))
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must_wait = false;
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rcu_read_unlock();
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}
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if (must_wait)
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ret = dma_fence_wait(fence, intr);
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}
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return ret;
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}
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void
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nouveau_fence_unref(struct nouveau_fence **pfence)
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{
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if (*pfence)
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dma_fence_put(&(*pfence)->base);
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*pfence = NULL;
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}
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int
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nouveau_fence_new(struct nouveau_channel *chan, bool sysmem,
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struct nouveau_fence **pfence)
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{
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struct nouveau_fence *fence;
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int ret = 0;
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if (unlikely(!chan->fence))
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return -ENODEV;
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fence = kzalloc(sizeof(*fence), GFP_KERNEL);
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if (!fence)
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return -ENOMEM;
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ret = nouveau_fence_emit(fence, chan);
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if (ret)
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nouveau_fence_unref(&fence);
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*pfence = fence;
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return ret;
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}
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static const char *nouveau_fence_get_get_driver_name(struct dma_fence *fence)
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{
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return "nouveau";
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}
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static const char *nouveau_fence_get_timeline_name(struct dma_fence *f)
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{
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struct nouveau_fence *fence = from_fence(f);
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struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
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return !fctx->dead ? fctx->name : "dead channel";
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}
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/*
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* In an ideal world, read would not assume the channel context is still alive.
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* This function may be called from another device, running into free memory as a
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* result. The drm node should still be there, so we can derive the index from
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* the fence context.
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*/
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static bool nouveau_fence_is_signaled(struct dma_fence *f)
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{
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struct nouveau_fence *fence = from_fence(f);
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struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
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struct nouveau_channel *chan;
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bool ret = false;
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rcu_read_lock();
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chan = rcu_dereference(fence->channel);
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if (chan)
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ret = (int)(fctx->read(chan) - fence->base.seqno) >= 0;
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rcu_read_unlock();
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return ret;
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}
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static bool nouveau_fence_no_signaling(struct dma_fence *f)
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{
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struct nouveau_fence *fence = from_fence(f);
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/*
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* caller should have a reference on the fence,
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* else fence could get freed here
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*/
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WARN_ON(kref_read(&fence->base.refcount) <= 1);
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/*
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* This needs uevents to work correctly, but dma_fence_add_callback relies on
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* being able to enable signaling. It will still get signaled eventually,
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* just not right away.
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*/
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if (nouveau_fence_is_signaled(f)) {
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list_del(&fence->head);
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dma_fence_put(&fence->base);
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return false;
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}
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return true;
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}
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static void nouveau_fence_release(struct dma_fence *f)
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{
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struct nouveau_fence *fence = from_fence(f);
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struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
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kref_put(&fctx->fence_ref, nouveau_fence_context_put);
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dma_fence_free(&fence->base);
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}
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static const struct dma_fence_ops nouveau_fence_ops_legacy = {
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.get_driver_name = nouveau_fence_get_get_driver_name,
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.get_timeline_name = nouveau_fence_get_timeline_name,
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.enable_signaling = nouveau_fence_no_signaling,
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.signaled = nouveau_fence_is_signaled,
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.wait = nouveau_fence_wait_legacy,
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.release = nouveau_fence_release
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};
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static bool nouveau_fence_enable_signaling(struct dma_fence *f)
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{
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struct nouveau_fence *fence = from_fence(f);
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struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
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bool ret;
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if (!fctx->notify_ref++)
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nvif_notify_get(&fctx->notify);
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ret = nouveau_fence_no_signaling(f);
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if (ret)
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set_bit(DMA_FENCE_FLAG_USER_BITS, &fence->base.flags);
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else if (!--fctx->notify_ref)
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nvif_notify_put(&fctx->notify);
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|
|
|
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,
|
|
.wait = dma_fence_default_wait,
|
|
.release = nouveau_fence_release
|
|
};
|