--- /dev/null
+/*
+ * 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
+};
Code Review / kvmfornfv.git / blobdiff