907af60b93
Signed-off-by: Francisco Jerez <currojerez@riseup.net> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
534 lines
12 KiB
C
534 lines
12 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 "drmP.h"
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#include "drm.h"
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#include "nouveau_drv.h"
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#include "nouveau_ramht.h"
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#include "nouveau_dma.h"
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#define USE_REFCNT(dev) (nouveau_private(dev)->chipset >= 0x10)
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#define USE_SEMA(dev) (nouveau_private(dev)->chipset >= 0x17)
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struct nouveau_fence {
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struct nouveau_channel *channel;
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struct kref refcount;
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struct list_head entry;
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uint32_t sequence;
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bool signalled;
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void (*work)(void *priv, bool signalled);
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void *priv;
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};
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struct nouveau_semaphore {
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struct kref ref;
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struct drm_device *dev;
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struct drm_mm_node *mem;
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};
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static inline struct nouveau_fence *
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nouveau_fence(void *sync_obj)
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{
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return (struct nouveau_fence *)sync_obj;
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}
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static void
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nouveau_fence_del(struct kref *ref)
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{
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struct nouveau_fence *fence =
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container_of(ref, struct nouveau_fence, refcount);
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kfree(fence);
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}
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void
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nouveau_fence_update(struct nouveau_channel *chan)
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{
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struct drm_device *dev = chan->dev;
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struct nouveau_fence *tmp, *fence;
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uint32_t sequence;
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spin_lock(&chan->fence.lock);
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if (USE_REFCNT(dev))
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sequence = nvchan_rd32(chan, 0x48);
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else
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sequence = atomic_read(&chan->fence.last_sequence_irq);
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if (chan->fence.sequence_ack == sequence)
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goto out;
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chan->fence.sequence_ack = sequence;
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list_for_each_entry_safe(fence, tmp, &chan->fence.pending, entry) {
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sequence = fence->sequence;
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fence->signalled = true;
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list_del(&fence->entry);
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if (unlikely(fence->work))
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fence->work(fence->priv, true);
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kref_put(&fence->refcount, nouveau_fence_del);
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if (sequence == chan->fence.sequence_ack)
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break;
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}
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out:
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spin_unlock(&chan->fence.lock);
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}
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int
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nouveau_fence_new(struct nouveau_channel *chan, struct nouveau_fence **pfence,
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bool emit)
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{
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struct nouveau_fence *fence;
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int ret = 0;
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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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kref_init(&fence->refcount);
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fence->channel = chan;
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if (emit)
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ret = nouveau_fence_emit(fence);
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if (ret)
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nouveau_fence_unref((void *)&fence);
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*pfence = fence;
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return ret;
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}
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struct nouveau_channel *
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nouveau_fence_channel(struct nouveau_fence *fence)
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{
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return fence ? fence->channel : NULL;
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}
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int
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nouveau_fence_emit(struct nouveau_fence *fence)
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{
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struct nouveau_channel *chan = fence->channel;
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struct drm_device *dev = chan->dev;
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int ret;
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ret = RING_SPACE(chan, 2);
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if (ret)
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return ret;
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if (unlikely(chan->fence.sequence == chan->fence.sequence_ack - 1)) {
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nouveau_fence_update(chan);
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BUG_ON(chan->fence.sequence ==
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chan->fence.sequence_ack - 1);
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}
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fence->sequence = ++chan->fence.sequence;
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kref_get(&fence->refcount);
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spin_lock(&chan->fence.lock);
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list_add_tail(&fence->entry, &chan->fence.pending);
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spin_unlock(&chan->fence.lock);
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BEGIN_RING(chan, NvSubSw, USE_REFCNT(dev) ? 0x0050 : 0x0150, 1);
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OUT_RING(chan, fence->sequence);
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FIRE_RING(chan);
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return 0;
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}
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void
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nouveau_fence_work(struct nouveau_fence *fence,
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void (*work)(void *priv, bool signalled),
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void *priv)
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{
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BUG_ON(fence->work);
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spin_lock(&fence->channel->fence.lock);
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if (fence->signalled) {
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work(priv, true);
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} else {
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fence->work = work;
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fence->priv = priv;
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}
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spin_unlock(&fence->channel->fence.lock);
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}
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void
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nouveau_fence_unref(void **sync_obj)
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{
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struct nouveau_fence *fence = nouveau_fence(*sync_obj);
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if (fence)
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kref_put(&fence->refcount, nouveau_fence_del);
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*sync_obj = NULL;
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}
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void *
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nouveau_fence_ref(void *sync_obj)
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{
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struct nouveau_fence *fence = nouveau_fence(sync_obj);
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kref_get(&fence->refcount);
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return sync_obj;
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}
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bool
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nouveau_fence_signalled(void *sync_obj, void *sync_arg)
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{
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struct nouveau_fence *fence = nouveau_fence(sync_obj);
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struct nouveau_channel *chan = fence->channel;
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if (fence->signalled)
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return true;
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nouveau_fence_update(chan);
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return fence->signalled;
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}
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int
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nouveau_fence_wait(void *sync_obj, void *sync_arg, bool lazy, bool intr)
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{
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unsigned long timeout = jiffies + (3 * DRM_HZ);
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int ret = 0;
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while (1) {
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if (nouveau_fence_signalled(sync_obj, sync_arg))
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break;
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if (time_after_eq(jiffies, timeout)) {
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ret = -EBUSY;
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break;
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}
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__set_current_state(intr ? TASK_INTERRUPTIBLE
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: TASK_UNINTERRUPTIBLE);
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if (lazy)
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schedule_timeout(1);
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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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static struct nouveau_semaphore *
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alloc_semaphore(struct drm_device *dev)
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{
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struct drm_nouveau_private *dev_priv = dev->dev_private;
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struct nouveau_semaphore *sema;
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int ret;
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if (!USE_SEMA(dev))
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return NULL;
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sema = kmalloc(sizeof(*sema), GFP_KERNEL);
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if (!sema)
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goto fail;
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ret = drm_mm_pre_get(&dev_priv->fence.heap);
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if (ret)
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goto fail;
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spin_lock(&dev_priv->fence.lock);
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sema->mem = drm_mm_search_free(&dev_priv->fence.heap, 4, 0, 0);
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if (sema->mem)
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sema->mem = drm_mm_get_block_atomic(sema->mem, 4, 0);
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spin_unlock(&dev_priv->fence.lock);
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if (!sema->mem)
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goto fail;
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kref_init(&sema->ref);
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sema->dev = dev;
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nouveau_bo_wr32(dev_priv->fence.bo, sema->mem->start / 4, 0);
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return sema;
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fail:
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kfree(sema);
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return NULL;
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}
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static void
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free_semaphore(struct kref *ref)
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{
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struct nouveau_semaphore *sema =
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container_of(ref, struct nouveau_semaphore, ref);
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struct drm_nouveau_private *dev_priv = sema->dev->dev_private;
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spin_lock(&dev_priv->fence.lock);
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drm_mm_put_block(sema->mem);
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spin_unlock(&dev_priv->fence.lock);
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kfree(sema);
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}
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static void
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semaphore_work(void *priv, bool signalled)
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{
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struct nouveau_semaphore *sema = priv;
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struct drm_nouveau_private *dev_priv = sema->dev->dev_private;
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if (unlikely(!signalled))
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nouveau_bo_wr32(dev_priv->fence.bo, sema->mem->start / 4, 1);
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kref_put(&sema->ref, free_semaphore);
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}
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static int
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emit_semaphore(struct nouveau_channel *chan, int method,
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struct nouveau_semaphore *sema)
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{
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struct drm_nouveau_private *dev_priv = sema->dev->dev_private;
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struct nouveau_fence *fence;
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bool smart = (dev_priv->card_type >= NV_50);
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int ret;
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ret = RING_SPACE(chan, smart ? 8 : 4);
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if (ret)
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return ret;
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if (smart) {
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BEGIN_RING(chan, NvSubSw, NV_SW_DMA_SEMAPHORE, 1);
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OUT_RING(chan, NvSema);
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}
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BEGIN_RING(chan, NvSubSw, NV_SW_SEMAPHORE_OFFSET, 1);
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OUT_RING(chan, sema->mem->start);
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if (smart && method == NV_SW_SEMAPHORE_ACQUIRE) {
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/*
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* NV50 tries to be too smart and context-switch
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* between semaphores instead of doing a "first come,
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* first served" strategy like previous cards
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* do.
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*
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* That's bad because the ACQUIRE latency can get as
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* large as the PFIFO context time slice in the
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* typical DRI2 case where you have several
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* outstanding semaphores at the same moment.
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*
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* If we're going to ACQUIRE, force the card to
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* context switch before, just in case the matching
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* RELEASE is already scheduled to be executed in
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* another channel.
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*/
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BEGIN_RING(chan, NvSubSw, NV_SW_YIELD, 1);
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OUT_RING(chan, 0);
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}
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BEGIN_RING(chan, NvSubSw, method, 1);
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OUT_RING(chan, 1);
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if (smart && method == NV_SW_SEMAPHORE_RELEASE) {
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/*
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* Force the card to context switch, there may be
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* another channel waiting for the semaphore we just
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* released.
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*/
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BEGIN_RING(chan, NvSubSw, NV_SW_YIELD, 1);
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OUT_RING(chan, 0);
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}
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/* Delay semaphore destruction until its work is done */
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ret = nouveau_fence_new(chan, &fence, true);
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if (ret)
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return ret;
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kref_get(&sema->ref);
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nouveau_fence_work(fence, semaphore_work, sema);
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nouveau_fence_unref((void *)&fence);
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return 0;
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}
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int
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nouveau_fence_sync(struct nouveau_fence *fence,
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struct nouveau_channel *wchan)
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{
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struct nouveau_channel *chan = nouveau_fence_channel(fence);
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struct drm_device *dev = wchan->dev;
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struct nouveau_semaphore *sema;
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int ret;
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if (likely(!fence || chan == wchan ||
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nouveau_fence_signalled(fence, NULL)))
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return 0;
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sema = alloc_semaphore(dev);
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if (!sema) {
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/* Early card or broken userspace, fall back to
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* software sync. */
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return nouveau_fence_wait(fence, NULL, false, false);
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}
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/* Make wchan wait until it gets signalled */
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ret = emit_semaphore(wchan, NV_SW_SEMAPHORE_ACQUIRE, sema);
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if (ret)
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goto out;
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/* Signal the semaphore from chan */
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ret = emit_semaphore(chan, NV_SW_SEMAPHORE_RELEASE, sema);
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out:
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kref_put(&sema->ref, free_semaphore);
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return ret;
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}
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int
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nouveau_fence_flush(void *sync_obj, void *sync_arg)
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{
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return 0;
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}
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int
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nouveau_fence_channel_init(struct nouveau_channel *chan)
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{
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struct drm_device *dev = chan->dev;
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struct drm_nouveau_private *dev_priv = dev->dev_private;
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struct nouveau_gpuobj *obj = NULL;
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int ret;
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/* Create an NV_SW object for various sync purposes */
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ret = nouveau_gpuobj_sw_new(chan, NV_SW, &obj);
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if (ret)
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return ret;
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ret = nouveau_ramht_insert(chan, NvSw, obj);
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nouveau_gpuobj_ref(NULL, &obj);
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if (ret)
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return ret;
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ret = RING_SPACE(chan, 2);
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if (ret)
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return ret;
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BEGIN_RING(chan, NvSubSw, 0, 1);
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OUT_RING(chan, NvSw);
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/* Create a DMA object for the shared cross-channel sync area. */
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if (USE_SEMA(dev)) {
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struct drm_mm_node *mem = dev_priv->fence.bo->bo.mem.mm_node;
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ret = nouveau_gpuobj_dma_new(chan, NV_CLASS_DMA_IN_MEMORY,
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mem->start << PAGE_SHIFT,
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mem->size << PAGE_SHIFT,
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NV_DMA_ACCESS_RW,
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NV_DMA_TARGET_VIDMEM, &obj);
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if (ret)
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return ret;
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ret = nouveau_ramht_insert(chan, NvSema, obj);
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nouveau_gpuobj_ref(NULL, &obj);
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if (ret)
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return ret;
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ret = RING_SPACE(chan, 2);
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if (ret)
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return ret;
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BEGIN_RING(chan, NvSubSw, NV_SW_DMA_SEMAPHORE, 1);
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OUT_RING(chan, NvSema);
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}
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FIRE_RING(chan);
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INIT_LIST_HEAD(&chan->fence.pending);
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spin_lock_init(&chan->fence.lock);
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atomic_set(&chan->fence.last_sequence_irq, 0);
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return 0;
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}
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void
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nouveau_fence_channel_fini(struct nouveau_channel *chan)
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{
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struct nouveau_fence *tmp, *fence;
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list_for_each_entry_safe(fence, tmp, &chan->fence.pending, entry) {
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fence->signalled = true;
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list_del(&fence->entry);
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if (unlikely(fence->work))
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fence->work(fence->priv, false);
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kref_put(&fence->refcount, nouveau_fence_del);
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}
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}
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int
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nouveau_fence_init(struct drm_device *dev)
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{
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struct drm_nouveau_private *dev_priv = dev->dev_private;
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int ret;
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/* Create a shared VRAM heap for cross-channel sync. */
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if (USE_SEMA(dev)) {
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ret = nouveau_bo_new(dev, NULL, 4096, 0, TTM_PL_FLAG_VRAM,
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0, 0, false, true, &dev_priv->fence.bo);
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if (ret)
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return ret;
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ret = nouveau_bo_pin(dev_priv->fence.bo, TTM_PL_FLAG_VRAM);
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if (ret)
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goto fail;
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ret = nouveau_bo_map(dev_priv->fence.bo);
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if (ret)
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goto fail;
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ret = drm_mm_init(&dev_priv->fence.heap, 0,
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dev_priv->fence.bo->bo.mem.size);
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if (ret)
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goto fail;
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spin_lock_init(&dev_priv->fence.lock);
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}
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return 0;
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fail:
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nouveau_bo_unmap(dev_priv->fence.bo);
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nouveau_bo_ref(NULL, &dev_priv->fence.bo);
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return ret;
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}
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void
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nouveau_fence_fini(struct drm_device *dev)
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{
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struct drm_nouveau_private *dev_priv = dev->dev_private;
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if (USE_SEMA(dev)) {
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drm_mm_takedown(&dev_priv->fence.heap);
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nouveau_bo_unmap(dev_priv->fence.bo);
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nouveau_bo_unpin(dev_priv->fence.bo);
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nouveau_bo_ref(NULL, &dev_priv->fence.bo);
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}
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}
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