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https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 20:53:53 +08:00
drm/nv84: switch to new-style semaphores
These are the same semaphores nvc0 will use, and they potentially allow us to do much cooler things than our current inter-channel sync impl. Lets switch to them where possible now for some testing. Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs
parent
e0435120a8
commit
c3b90a7d4c
@ -259,11 +259,12 @@ __nouveau_fence_wait(void *sync_obj, void *sync_arg, bool lazy, bool intr)
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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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semaphore_alloc(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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int size = (dev_priv->chipset < 0x84) ? 4 : 16;
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int ret, i;
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if (!USE_SEMA(dev))
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return NULL;
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@ -277,9 +278,9 @@ alloc_semaphore(struct drm_device *dev)
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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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sema->mem = drm_mm_search_free(&dev_priv->fence.heap, size, 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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sema->mem = drm_mm_get_block_atomic(sema->mem, size, 0);
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spin_unlock(&dev_priv->fence.lock);
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if (!sema->mem)
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@ -287,7 +288,8 @@ alloc_semaphore(struct drm_device *dev)
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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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for (i = sema->mem->start; i < sema->mem->start + size; i += 4)
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nouveau_bo_wr32(dev_priv->fence.bo, i / 4, 0);
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return sema;
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fail:
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@ -296,7 +298,7 @@ fail:
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}
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static void
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free_semaphore(struct kref *ref)
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semaphore_free(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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@ -318,30 +320,25 @@ semaphore_work(void *priv, bool signalled)
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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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kref_put(&sema->ref, semaphore_free);
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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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semaphore_acquire(struct nouveau_channel *chan, 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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struct drm_nouveau_private *dev_priv = chan->dev->dev_private;
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struct nouveau_fence *fence = NULL;
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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 (dev_priv->chipset < 0x84) {
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ret = RING_SPACE(chan, 3);
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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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BEGIN_RING(chan, NvSubSw, NV_SW_SEMAPHORE_OFFSET, 2);
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OUT_RING (chan, sema->mem->start);
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OUT_RING (chan, 1);
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} else {
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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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@ -358,21 +355,18 @@ emit_semaphore(struct nouveau_channel *chan, int method,
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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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ret = RING_SPACE(chan, 7);
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if (ret)
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return ret;
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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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BEGIN_RING(chan, NvSubSw, 0x0080, 1);
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OUT_RING (chan, 0);
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BEGIN_RING(chan, NvSubSw, 0x0010, 4);
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OUT_RING (chan, upper_32_bits(sema->mem->start));
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OUT_RING (chan, lower_32_bits(sema->mem->start));
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OUT_RING (chan, 1);
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OUT_RING (chan, 1); /* ACQUIRE_EQ */
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}
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/* Delay semaphore destruction until its work is done */
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@ -383,7 +377,53 @@ emit_semaphore(struct nouveau_channel *chan, int method,
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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(&fence);
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return 0;
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}
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static int
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semaphore_release(struct nouveau_channel *chan, struct nouveau_semaphore *sema)
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{
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struct drm_nouveau_private *dev_priv = chan->dev->dev_private;
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struct nouveau_fence *fence = NULL;
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int ret;
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if (dev_priv->chipset < 0x84) {
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ret = RING_SPACE(chan, 4);
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if (ret)
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return ret;
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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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BEGIN_RING(chan, NvSubSw, NV_SW_SEMAPHORE_RELEASE, 1);
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OUT_RING (chan, 1);
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} else {
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/*
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* Emits release and forces the card to context switch right
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* afterwards, there may be another channel waiting for the
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* semaphore
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*/
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ret = RING_SPACE(chan, 7);
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if (ret)
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return ret;
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BEGIN_RING(chan, NvSubSw, 0x0010, 4);
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OUT_RING (chan, upper_32_bits(sema->mem->start));
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OUT_RING (chan, lower_32_bits(sema->mem->start));
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OUT_RING (chan, 1);
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OUT_RING (chan, 2); /* RELEASE */
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BEGIN_RING(chan, NvSubSw, 0x0080, 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(&fence);
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return 0;
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}
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@ -400,7 +440,7 @@ nouveau_fence_sync(struct nouveau_fence *fence,
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nouveau_fence_signalled(fence)))
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goto out;
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sema = alloc_semaphore(dev);
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sema = semaphore_alloc(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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@ -418,17 +458,17 @@ nouveau_fence_sync(struct nouveau_fence *fence,
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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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ret = semaphore_acquire(wchan, sema);
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if (ret)
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goto out_unlock;
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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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ret = semaphore_release(chan, sema);
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out_unlock:
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mutex_unlock(&chan->mutex);
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out_unref:
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kref_put(&sema->ref, free_semaphore);
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kref_put(&sema->ref, semaphore_free);
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out:
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if (chan)
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nouveau_channel_put_unlocked(&chan);
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@ -519,11 +559,12 @@ 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 size = (dev_priv->chipset < 0x84) ? 4096 : 16384;
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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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ret = nouveau_bo_new(dev, NULL, size, 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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