From 0c6c1c2fb8b0fd4340f78db20ee7f35d2a810907 Mon Sep 17 00:00:00 2001 From: Francisco Jerez Date: Wed, 22 Sep 2010 00:58:54 +0200 Subject: [PATCH] drm/nouveau: Use semaphores to handle inter-channel sync in hardware. Signed-off-by: Francisco Jerez Signed-off-by: Ben Skeggs --- drivers/gpu/drm/nouveau/nouveau_dma.h | 1 + drivers/gpu/drm/nouveau/nouveau_drv.h | 8 + drivers/gpu/drm/nouveau/nouveau_fence.c | 195 +++++++++++++++++++++++- drivers/gpu/drm/nouveau/nouveau_state.c | 11 +- 4 files changed, 212 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/nouveau/nouveau_dma.h b/drivers/gpu/drm/nouveau/nouveau_dma.h index 8b05c15866d..d578c21d3c8 100644 --- a/drivers/gpu/drm/nouveau/nouveau_dma.h +++ b/drivers/gpu/drm/nouveau/nouveau_dma.h @@ -72,6 +72,7 @@ enum { NvGdiRect = 0x8000000c, NvImageBlit = 0x8000000d, NvSw = 0x8000000e, + NvSema = 0x8000000f, /* G80+ display objects */ NvEvoVRAM = 0x01000000, diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h index d4f049d42ed..a308c132c19 100644 --- a/drivers/gpu/drm/nouveau/nouveau_drv.h +++ b/drivers/gpu/drm/nouveau/nouveau_drv.h @@ -622,6 +622,12 @@ struct drm_nouveau_private { atomic_t validate_sequence; } ttm; + struct { + spinlock_t lock; + struct drm_mm heap; + struct nouveau_bo *bo; + } fence; + int fifo_alloc_count; struct nouveau_channel *fifos[NOUVEAU_MAX_CHANNEL_NR]; @@ -1237,6 +1243,8 @@ extern int nouveau_bo_sync_gpu(struct nouveau_bo *, struct nouveau_channel *); /* nouveau_fence.c */ struct nouveau_fence; +extern int nouveau_fence_init(struct drm_device *); +extern void nouveau_fence_fini(struct drm_device *); extern int nouveau_fence_channel_init(struct nouveau_channel *); extern void nouveau_fence_channel_fini(struct nouveau_channel *); extern void nouveau_fence_update(struct nouveau_channel *); diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c b/drivers/gpu/drm/nouveau/nouveau_fence.c index fbb2c3b2623..f42675cc9d1 100644 --- a/drivers/gpu/drm/nouveau/nouveau_fence.c +++ b/drivers/gpu/drm/nouveau/nouveau_fence.c @@ -28,9 +28,11 @@ #include "drm.h" #include "nouveau_drv.h" +#include "nouveau_ramht.h" #include "nouveau_dma.h" #define USE_REFCNT(dev) (nouveau_private(dev)->chipset >= 0x10) +#define USE_SEMA(dev) (nouveau_private(dev)->chipset >= 0x17) struct nouveau_fence { struct nouveau_channel *channel; @@ -44,6 +46,12 @@ struct nouveau_fence { void *priv; }; +struct nouveau_semaphore { + struct kref ref; + struct drm_device *dev; + struct drm_mm_node *mem; +}; + static inline struct nouveau_fence * nouveau_fence(void *sync_obj) { @@ -236,17 +244,128 @@ nouveau_fence_wait(void *sync_obj, void *sync_arg, bool lazy, bool intr) return ret; } +static struct nouveau_semaphore * +alloc_semaphore(struct drm_device *dev) +{ + struct drm_nouveau_private *dev_priv = dev->dev_private; + struct nouveau_semaphore *sema; + + if (!USE_SEMA(dev)) + return NULL; + + sema = kmalloc(sizeof(*sema), GFP_KERNEL); + if (!sema) + goto fail; + + spin_lock(&dev_priv->fence.lock); + sema->mem = drm_mm_search_free(&dev_priv->fence.heap, 4, 0, 0); + if (sema->mem) + sema->mem = drm_mm_get_block(sema->mem, 4, 0); + spin_unlock(&dev_priv->fence.lock); + + if (!sema->mem) + goto fail; + + kref_init(&sema->ref); + sema->dev = dev; + nouveau_bo_wr32(dev_priv->fence.bo, sema->mem->start / 4, 0); + + return sema; +fail: + kfree(sema); + return NULL; +} + +static void +free_semaphore(struct kref *ref) +{ + struct nouveau_semaphore *sema = + container_of(ref, struct nouveau_semaphore, ref); + struct drm_nouveau_private *dev_priv = sema->dev->dev_private; + + spin_lock(&dev_priv->fence.lock); + drm_mm_put_block(sema->mem); + spin_unlock(&dev_priv->fence.lock); + + kfree(sema); +} + +static void +semaphore_work(void *priv, bool signalled) +{ + struct nouveau_semaphore *sema = priv; + struct drm_nouveau_private *dev_priv = sema->dev->dev_private; + + if (unlikely(!signalled)) + nouveau_bo_wr32(dev_priv->fence.bo, sema->mem->start / 4, 1); + + kref_put(&sema->ref, free_semaphore); +} + +static int +emit_semaphore(struct nouveau_channel *chan, int method, + struct nouveau_semaphore *sema) +{ + struct drm_nouveau_private *dev_priv = sema->dev->dev_private; + struct nouveau_fence *fence; + int ret; + + ret = RING_SPACE(chan, dev_priv->card_type >= NV_50 ? 6 : 4); + if (ret) + return ret; + + if (dev_priv->card_type >= NV_50) { + BEGIN_RING(chan, NvSubSw, NV_SW_DMA_SEMAPHORE, 1); + OUT_RING(chan, NvSema); + } + BEGIN_RING(chan, NvSubSw, NV_SW_SEMAPHORE_OFFSET, 1); + OUT_RING(chan, sema->mem->start); + BEGIN_RING(chan, NvSubSw, method, 1); + OUT_RING(chan, 1); + + /* Delay semaphore destruction until its work is done */ + ret = nouveau_fence_new(chan, &fence, true); + if (ret) + return ret; + + kref_get(&sema->ref); + nouveau_fence_work(fence, semaphore_work, sema); + nouveau_fence_unref((void *)&fence); + + return 0; +} + int nouveau_fence_sync(struct nouveau_fence *fence, struct nouveau_channel *wchan) { struct nouveau_channel *chan = nouveau_fence_channel(fence); + struct drm_device *dev = wchan->dev; + struct nouveau_semaphore *sema; + int ret; if (likely(!fence || chan == wchan || nouveau_fence_signalled(fence, NULL))) return 0; - return nouveau_fence_wait(fence, NULL, false, false); + sema = alloc_semaphore(dev); + if (!sema) { + /* Early card or broken userspace, fall back to + * software sync. */ + return nouveau_fence_wait(fence, NULL, false, false); + } + + /* Signal the semaphore from chan */ + ret = emit_semaphore(chan, NV_SW_SEMAPHORE_RELEASE, sema); + if (ret) + goto out; + + /* Make wchan wait until it gets signalled */ + ret = emit_semaphore(wchan, NV_SW_SEMAPHORE_ACQUIRE, sema); + +out: + kref_put(&sema->ref, free_semaphore); + return ret; } int @@ -258,6 +377,8 @@ nouveau_fence_flush(void *sync_obj, void *sync_arg) int nouveau_fence_channel_init(struct nouveau_channel *chan) { + struct drm_device *dev = chan->dev; + struct drm_nouveau_private *dev_priv = dev->dev_private; struct nouveau_gpuobj *obj = NULL; int ret; @@ -277,6 +398,30 @@ nouveau_fence_channel_init(struct nouveau_channel *chan) BEGIN_RING(chan, NvSubSw, 0, 1); OUT_RING(chan, NvSw); + /* Create a DMA object for the shared cross-channel sync area. */ + if (USE_SEMA(dev)) { + struct drm_mm_node *mem = dev_priv->fence.bo->bo.mem.mm_node; + + ret = nouveau_gpuobj_dma_new(chan, NV_CLASS_DMA_IN_MEMORY, + mem->start << PAGE_SHIFT, + mem->size << PAGE_SHIFT, + NV_DMA_ACCESS_RW, + NV_DMA_TARGET_VIDMEM, &obj); + if (ret) + return ret; + + ret = nouveau_ramht_insert(chan, NvSema, obj); + nouveau_gpuobj_ref(NULL, &obj); + if (ret) + return ret; + + ret = RING_SPACE(chan, 2); + if (ret) + return ret; + BEGIN_RING(chan, NvSubSw, NV_SW_DMA_SEMAPHORE, 1); + OUT_RING(chan, NvSema); + } + FIRE_RING(chan); INIT_LIST_HEAD(&chan->fence.pending); @@ -302,3 +447,51 @@ nouveau_fence_channel_fini(struct nouveau_channel *chan) } } +int +nouveau_fence_init(struct drm_device *dev) +{ + struct drm_nouveau_private *dev_priv = dev->dev_private; + int ret; + + /* Create a shared VRAM heap for cross-channel sync. */ + if (USE_SEMA(dev)) { + ret = nouveau_bo_new(dev, NULL, 4096, 0, TTM_PL_FLAG_VRAM, + 0, 0, false, true, &dev_priv->fence.bo); + if (ret) + return ret; + + ret = nouveau_bo_pin(dev_priv->fence.bo, TTM_PL_FLAG_VRAM); + if (ret) + goto fail; + + ret = nouveau_bo_map(dev_priv->fence.bo); + if (ret) + goto fail; + + ret = drm_mm_init(&dev_priv->fence.heap, 0, + dev_priv->fence.bo->bo.mem.size); + if (ret) + goto fail; + + spin_lock_init(&dev_priv->fence.lock); + } + + return 0; +fail: + nouveau_bo_unmap(dev_priv->fence.bo); + nouveau_bo_ref(NULL, &dev_priv->fence.bo); + return ret; +} + +void +nouveau_fence_fini(struct drm_device *dev) +{ + struct drm_nouveau_private *dev_priv = dev->dev_private; + + if (USE_SEMA(dev)) { + drm_mm_takedown(&dev_priv->fence.heap); + nouveau_bo_unmap(dev_priv->fence.bo); + nouveau_bo_unpin(dev_priv->fence.bo); + nouveau_bo_ref(NULL, &dev_priv->fence.bo); + } +} diff --git a/drivers/gpu/drm/nouveau/nouveau_state.c b/drivers/gpu/drm/nouveau/nouveau_state.c index 75bce914e7b..ed7757f1408 100644 --- a/drivers/gpu/drm/nouveau/nouveau_state.c +++ b/drivers/gpu/drm/nouveau/nouveau_state.c @@ -639,9 +639,13 @@ nouveau_card_init(struct drm_device *dev) /* what about PVIDEO/PCRTC/PRAMDAC etc? */ if (!engine->graph.accel_blocked) { - ret = nouveau_card_init_channel(dev); + ret = nouveau_fence_init(dev); if (ret) goto out_irq; + + ret = nouveau_card_init_channel(dev); + if (ret) + goto out_fence; } ret = nouveau_backlight_init(dev); @@ -652,6 +656,8 @@ nouveau_card_init(struct drm_device *dev) drm_kms_helper_poll_init(dev); return 0; +out_fence: + nouveau_fence_fini(dev); out_irq: drm_irq_uninstall(dev); out_display: @@ -695,7 +701,8 @@ static void nouveau_card_takedown(struct drm_device *dev) nouveau_backlight_exit(dev); - if (dev_priv->channel) { + if (!engine->graph.accel_blocked) { + nouveau_fence_fini(dev); nouveau_channel_free(dev_priv->channel); dev_priv->channel = NULL; } -- 2.41.0