drivers/gpu/drm/nouveau/nv04_fifo.c - kernel/msm-4.19 - Gitiles

 /*
  * 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 "drmP.h"
 #include "drm.h"
 #include "nouveau_drv.h"
 #include "nouveau_ramht.h"
 #include "nouveau_util.h"

 #define NV04_RAMFC(c) (dev_priv->ramfc->pinst + ((c) * NV04_RAMFC__SIZE))
 #define NV04_RAMFC__SIZE 32
 #define NV04_RAMFC_DMA_PUT                                       0x00
 #define NV04_RAMFC_DMA_GET                                       0x04
 #define NV04_RAMFC_DMA_INSTANCE                                  0x08
 #define NV04_RAMFC_DMA_STATE                                     0x0C
 #define NV04_RAMFC_DMA_FETCH                                     0x10
 #define NV04_RAMFC_ENGINE                                        0x14
 #define NV04_RAMFC_PULL1_ENGINE                                  0x18

 #define RAMFC_WR(offset, val) nv_wo32(chan->ramfc, NV04_RAMFC_##offset, (val))
 #define RAMFC_RD(offset)      nv_ro32(chan->ramfc, NV04_RAMFC_##offset)

 void
 nv04_fifo_disable(struct drm_device *dev)
 {
 	uint32_t tmp;

 	tmp = nv_rd32(dev, NV04_PFIFO_CACHE1_DMA_PUSH);
 	nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_PUSH, tmp & ~1);
 	nv_wr32(dev, NV03_PFIFO_CACHE1_PUSH0, 0);
 	tmp = nv_rd32(dev, NV03_PFIFO_CACHE1_PULL1);
 	nv_wr32(dev, NV04_PFIFO_CACHE1_PULL0, tmp & ~1);
 }

 void
 nv04_fifo_enable(struct drm_device *dev)
 {
 	nv_wr32(dev, NV03_PFIFO_CACHE1_PUSH0, 1);
 	nv_wr32(dev, NV04_PFIFO_CACHE1_PULL0, 1);
 }

 bool
 nv04_fifo_reassign(struct drm_device *dev, bool enable)
 {
 	uint32_t reassign = nv_rd32(dev, NV03_PFIFO_CACHES);

 	nv_wr32(dev, NV03_PFIFO_CACHES, enable ? 1 : 0);
 	return (reassign == 1);
 }

 bool
 nv04_fifo_cache_pull(struct drm_device *dev, bool enable)
 {
 	int pull = nv_mask(dev, NV04_PFIFO_CACHE1_PULL0, 1, enable);

 	if (!enable) {
 		/* In some cases the PFIFO puller may be left in an
 		 * inconsistent state if you try to stop it when it's
 		 * busy translating handles. Sometimes you get a
 		 * PFIFO_CACHE_ERROR, sometimes it just fails silently
 		 * sending incorrect instance offsets to PGRAPH after
 		 * it's started up again. To avoid the latter we
 		 * invalidate the most recently calculated instance.
 		 */
 		if (!nv_wait(dev, NV04_PFIFO_CACHE1_PULL0,
 			     NV04_PFIFO_CACHE1_PULL0_HASH_BUSY, 0))
 			NV_ERROR(dev, "Timeout idling the PFIFO puller.\n");

 		if (nv_rd32(dev, NV04_PFIFO_CACHE1_PULL0) &
 		    NV04_PFIFO_CACHE1_PULL0_HASH_FAILED)
 			nv_wr32(dev, NV03_PFIFO_INTR_0,
 				NV_PFIFO_INTR_CACHE_ERROR);

 		nv_wr32(dev, NV04_PFIFO_CACHE1_HASH, 0);
 	}

 	return pull & 1;
 }

 int
 nv04_fifo_channel_id(struct drm_device *dev)
 {
 	return nv_rd32(dev, NV03_PFIFO_CACHE1_PUSH1) &
 			NV03_PFIFO_CACHE1_PUSH1_CHID_MASK;
 }

 #ifdef __BIG_ENDIAN
 #define DMA_FETCH_ENDIANNESS NV_PFIFO_CACHE1_BIG_ENDIAN
 #else
 #define DMA_FETCH_ENDIANNESS 0
 #endif

 int
 nv04_fifo_create_context(struct nouveau_channel *chan)
 {
 	struct drm_device *dev = chan->dev;
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	unsigned long flags;
 	int ret;

 	ret = nouveau_gpuobj_new_fake(dev, NV04_RAMFC(chan->id), ~0,
 						NV04_RAMFC__SIZE,
 						NVOBJ_FLAG_ZERO_ALLOC |
 						NVOBJ_FLAG_ZERO_FREE,
 						&chan->ramfc);
 	if (ret)
 		return ret;

 	spin_lock_irqsave(&dev_priv->context_switch_lock, flags);

 	/* Setup initial state */
 	RAMFC_WR(DMA_PUT, chan->pushbuf_base);
 	RAMFC_WR(DMA_GET, chan->pushbuf_base);
 	RAMFC_WR(DMA_INSTANCE, chan->pushbuf->pinst >> 4);
 	RAMFC_WR(DMA_FETCH, (NV_PFIFO_CACHE1_DMA_FETCH_TRIG_128_BYTES |
 			     NV_PFIFO_CACHE1_DMA_FETCH_SIZE_128_BYTES |
 			     NV_PFIFO_CACHE1_DMA_FETCH_MAX_REQS_8 |
 			     DMA_FETCH_ENDIANNESS));

 	/* enable the fifo dma operation */
 	nv_wr32(dev, NV04_PFIFO_MODE,
 		nv_rd32(dev, NV04_PFIFO_MODE) | (1 << chan->id));

 	spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
 	return 0;
 }

 void
 nv04_fifo_destroy_context(struct nouveau_channel *chan)
 {
 	struct drm_device *dev = chan->dev;
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_fifo_engine *pfifo = &dev_priv->engine.fifo;
 	unsigned long flags;

 	spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
 	pfifo->reassign(dev, false);

 	/* Unload the context if it's the currently active one */
 	if (pfifo->channel_id(dev) == chan->id) {
 		pfifo->disable(dev);
 		pfifo->unload_context(dev);
 		pfifo->enable(dev);
 	}

 	/* Keep it from being rescheduled */
 	nv_mask(dev, NV04_PFIFO_MODE, 1 << chan->id, 0);

 	pfifo->reassign(dev, true);
 	spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);

 	/* Free the channel resources */
 	nouveau_gpuobj_ref(NULL, &chan->ramfc);
 }

 static void
 nv04_fifo_do_load_context(struct drm_device *dev, int chid)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	uint32_t fc = NV04_RAMFC(chid), tmp;

 	nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_PUT, nv_ri32(dev, fc + 0));
 	nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_GET, nv_ri32(dev, fc + 4));
 	tmp = nv_ri32(dev, fc + 8);
 	nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_INSTANCE, tmp & 0xFFFF);
 	nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_DCOUNT, tmp >> 16);
 	nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_STATE, nv_ri32(dev, fc + 12));
 	nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_FETCH, nv_ri32(dev, fc + 16));
 	nv_wr32(dev, NV04_PFIFO_CACHE1_ENGINE, nv_ri32(dev, fc + 20));
 	nv_wr32(dev, NV04_PFIFO_CACHE1_PULL1, nv_ri32(dev, fc + 24));

 	nv_wr32(dev, NV03_PFIFO_CACHE1_GET, 0);
 	nv_wr32(dev, NV03_PFIFO_CACHE1_PUT, 0);
 }

 int
 nv04_fifo_load_context(struct nouveau_channel *chan)
 {
 	uint32_t tmp;

 	nv_wr32(chan->dev, NV03_PFIFO_CACHE1_PUSH1,
 			   NV03_PFIFO_CACHE1_PUSH1_DMA | chan->id);
 	nv04_fifo_do_load_context(chan->dev, chan->id);
 	nv_wr32(chan->dev, NV04_PFIFO_CACHE1_DMA_PUSH, 1);

 	/* Reset NV04_PFIFO_CACHE1_DMA_CTL_AT_INFO to INVALID */
 	tmp = nv_rd32(chan->dev, NV04_PFIFO_CACHE1_DMA_CTL) & ~(1 << 31);
 	nv_wr32(chan->dev, NV04_PFIFO_CACHE1_DMA_CTL, tmp);

 	return 0;
 }

 int
 nv04_fifo_unload_context(struct drm_device *dev)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_fifo_engine *pfifo = &dev_priv->engine.fifo;
 	struct nouveau_channel *chan = NULL;
 	uint32_t tmp;
 	int chid;

 	chid = pfifo->channel_id(dev);
 	if (chid < 0 || chid >= dev_priv->engine.fifo.channels)
 		return 0;

 	chan = dev_priv->channels.ptr[chid];
 	if (!chan) {
 		NV_ERROR(dev, "Inactive channel on PFIFO: %d\n", chid);
 		return -EINVAL;
 	}

 	RAMFC_WR(DMA_PUT, nv_rd32(dev, NV04_PFIFO_CACHE1_DMA_PUT));
 	RAMFC_WR(DMA_GET, nv_rd32(dev, NV04_PFIFO_CACHE1_DMA_GET));
 	tmp  = nv_rd32(dev, NV04_PFIFO_CACHE1_DMA_DCOUNT) << 16;
 	tmp |= nv_rd32(dev, NV04_PFIFO_CACHE1_DMA_INSTANCE);
 	RAMFC_WR(DMA_INSTANCE, tmp);
 	RAMFC_WR(DMA_STATE, nv_rd32(dev, NV04_PFIFO_CACHE1_DMA_STATE));
 	RAMFC_WR(DMA_FETCH, nv_rd32(dev, NV04_PFIFO_CACHE1_DMA_FETCH));
 	RAMFC_WR(ENGINE, nv_rd32(dev, NV04_PFIFO_CACHE1_ENGINE));
 	RAMFC_WR(PULL1_ENGINE, nv_rd32(dev, NV04_PFIFO_CACHE1_PULL1));

 	nv04_fifo_do_load_context(dev, pfifo->channels - 1);
 	nv_wr32(dev, NV03_PFIFO_CACHE1_PUSH1, pfifo->channels - 1);
 	return 0;
 }

 static void
 nv04_fifo_init_reset(struct drm_device *dev)
 {
 	nv_wr32(dev, NV03_PMC_ENABLE,
 		nv_rd32(dev, NV03_PMC_ENABLE) & ~NV_PMC_ENABLE_PFIFO);
 	nv_wr32(dev, NV03_PMC_ENABLE,
 		nv_rd32(dev, NV03_PMC_ENABLE) |  NV_PMC_ENABLE_PFIFO);

 	nv_wr32(dev, 0x003224, 0x000f0078);
 	nv_wr32(dev, 0x002044, 0x0101ffff);
 	nv_wr32(dev, 0x002040, 0x000000ff);
 	nv_wr32(dev, 0x002500, 0x00000000);
 	nv_wr32(dev, 0x003000, 0x00000000);
 	nv_wr32(dev, 0x003050, 0x00000000);
 	nv_wr32(dev, 0x003200, 0x00000000);
 	nv_wr32(dev, 0x003250, 0x00000000);
 	nv_wr32(dev, 0x003220, 0x00000000);

 	nv_wr32(dev, 0x003250, 0x00000000);
 	nv_wr32(dev, 0x003270, 0x00000000);
 	nv_wr32(dev, 0x003210, 0x00000000);
 }

 static void
 nv04_fifo_init_ramxx(struct drm_device *dev)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;

 	nv_wr32(dev, NV03_PFIFO_RAMHT, (0x03 << 24) /* search 128 */ |
 				       ((dev_priv->ramht->bits - 9) << 16) |
 				       (dev_priv->ramht->gpuobj->pinst >> 8));
 	nv_wr32(dev, NV03_PFIFO_RAMRO, dev_priv->ramro->pinst >> 8);
 	nv_wr32(dev, NV03_PFIFO_RAMFC, dev_priv->ramfc->pinst >> 8);
 }

 static void
 nv04_fifo_init_intr(struct drm_device *dev)
 {
 	nouveau_irq_register(dev, 8, nv04_fifo_isr);
 	nv_wr32(dev, 0x002100, 0xffffffff);
 	nv_wr32(dev, 0x002140, 0xffffffff);
 }

 int
 nv04_fifo_init(struct drm_device *dev)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_fifo_engine *pfifo = &dev_priv->engine.fifo;
 	int i;

 	nv04_fifo_init_reset(dev);
 	nv04_fifo_init_ramxx(dev);

 	nv04_fifo_do_load_context(dev, pfifo->channels - 1);
 	nv_wr32(dev, NV03_PFIFO_CACHE1_PUSH1, pfifo->channels - 1);

 	nv04_fifo_init_intr(dev);
 	pfifo->enable(dev);
 	pfifo->reassign(dev, true);

 	for (i = 0; i < dev_priv->engine.fifo.channels; i++) {
 		if (dev_priv->channels.ptr[i]) {
 			uint32_t mode = nv_rd32(dev, NV04_PFIFO_MODE);
 			nv_wr32(dev, NV04_PFIFO_MODE, mode | (1 << i));
 		}
 	}

 	return 0;
 }

 void
 nv04_fifo_fini(struct drm_device *dev)
 {
 	nv_wr32(dev, 0x2140, 0x00000000);
 	nouveau_irq_unregister(dev, 8);
 }

 static bool
 nouveau_fifo_swmthd(struct drm_device *dev, u32 chid, u32 addr, u32 data)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_channel *chan = NULL;
 	struct nouveau_gpuobj *obj;
 	unsigned long flags;
 	const int subc = (addr >> 13) & 0x7;
 	const int mthd = addr & 0x1ffc;
 	bool handled = false;
 	u32 engine;

 	spin_lock_irqsave(&dev_priv->channels.lock, flags);
 	if (likely(chid >= 0 && chid < dev_priv->engine.fifo.channels))
 		chan = dev_priv->channels.ptr[chid];
 	if (unlikely(!chan))
 		goto out;

 	switch (mthd) {
 	case 0x0000: /* bind object to subchannel */
 		obj = nouveau_ramht_find(chan, data);
 		if (unlikely(!obj || obj->engine != NVOBJ_ENGINE_SW))
 			break;

 		chan->sw_subchannel[subc] = obj->class;
 		engine = 0x0000000f << (subc * 4);

 		nv_mask(dev, NV04_PFIFO_CACHE1_ENGINE, engine, 0x00000000);
 		handled = true;
 		break;
 	default:
 		engine = nv_rd32(dev, NV04_PFIFO_CACHE1_ENGINE);
 		if (unlikely(((engine >> (subc * 4)) & 0xf) != 0))
 			break;

 		if (!nouveau_gpuobj_mthd_call(chan, chan->sw_subchannel[subc],
 					      mthd, data))
 			handled = true;
 		break;
 	}

 out:
 	spin_unlock_irqrestore(&dev_priv->channels.lock, flags);
 	return handled;
 }

 void
 nv04_fifo_isr(struct drm_device *dev)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_engine *engine = &dev_priv->engine;
 	uint32_t status, reassign;
 	int cnt = 0;

 	reassign = nv_rd32(dev, NV03_PFIFO_CACHES) & 1;
 	while ((status = nv_rd32(dev, NV03_PFIFO_INTR_0)) && (cnt++ < 100)) {
 		uint32_t chid, get;

 		nv_wr32(dev, NV03_PFIFO_CACHES, 0);

 		chid = engine->fifo.channel_id(dev);
 		get  = nv_rd32(dev, NV03_PFIFO_CACHE1_GET);

 		if (status & NV_PFIFO_INTR_CACHE_ERROR) {
 			uint32_t mthd, data;
 			int ptr;

 			/* NV_PFIFO_CACHE1_GET actually goes to 0xffc before
 			 * wrapping on my G80 chips, but CACHE1 isn't big
 			 * enough for this much data.. Tests show that it
 			 * wraps around to the start at GET=0x800.. No clue
 			 * as to why..
 			 */
 			ptr = (get & 0x7ff) >> 2;

 			if (dev_priv->card_type < NV_40) {
 				mthd = nv_rd32(dev,
 					NV04_PFIFO_CACHE1_METHOD(ptr));
 				data = nv_rd32(dev,
 					NV04_PFIFO_CACHE1_DATA(ptr));
 			} else {
 				mthd = nv_rd32(dev,
 					NV40_PFIFO_CACHE1_METHOD(ptr));
 				data = nv_rd32(dev,
 					NV40_PFIFO_CACHE1_DATA(ptr));
 			}

 			if (!nouveau_fifo_swmthd(dev, chid, mthd, data)) {
 				NV_INFO(dev, "PFIFO_CACHE_ERROR - Ch %d/%d "
 					     "Mthd 0x%04x Data 0x%08x\n",
 					chid, (mthd >> 13) & 7, mthd & 0x1ffc,
 					data);
 			}

 			nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_PUSH, 0);
 			nv_wr32(dev, NV03_PFIFO_INTR_0,
 						NV_PFIFO_INTR_CACHE_ERROR);

 			nv_wr32(dev, NV03_PFIFO_CACHE1_PUSH0,
 				nv_rd32(dev, NV03_PFIFO_CACHE1_PUSH0) & ~1);
 			nv_wr32(dev, NV03_PFIFO_CACHE1_GET, get + 4);
 			nv_wr32(dev, NV03_PFIFO_CACHE1_PUSH0,
 				nv_rd32(dev, NV03_PFIFO_CACHE1_PUSH0) | 1);
 			nv_wr32(dev, NV04_PFIFO_CACHE1_HASH, 0);

 			nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_PUSH,
 				nv_rd32(dev, NV04_PFIFO_CACHE1_DMA_PUSH) | 1);
 			nv_wr32(dev, NV04_PFIFO_CACHE1_PULL0, 1);

 			status &= ~NV_PFIFO_INTR_CACHE_ERROR;
 		}

 		if (status & NV_PFIFO_INTR_DMA_PUSHER) {
 			u32 dma_get = nv_rd32(dev, 0x003244);
 			u32 dma_put = nv_rd32(dev, 0x003240);
 			u32 push = nv_rd32(dev, 0x003220);
 			u32 state = nv_rd32(dev, 0x003228);

 			if (dev_priv->card_type == NV_50) {
 				u32 ho_get = nv_rd32(dev, 0x003328);
 				u32 ho_put = nv_rd32(dev, 0x003320);
 				u32 ib_get = nv_rd32(dev, 0x003334);
 				u32 ib_put = nv_rd32(dev, 0x003330);

 				if (nouveau_ratelimit())
 					NV_INFO(dev, "PFIFO_DMA_PUSHER - Ch %d Get 0x%02x%08x "
 					     "Put 0x%02x%08x IbGet 0x%08x IbPut 0x%08x "
 					     "State 0x%08x Push 0x%08x\n",
 						chid, ho_get, dma_get, ho_put,
 						dma_put, ib_get, ib_put, state,
 						push);

 				/* METHOD_COUNT, in DMA_STATE on earlier chipsets */
 				nv_wr32(dev, 0x003364, 0x00000000);
 				if (dma_get != dma_put || ho_get != ho_put) {
 					nv_wr32(dev, 0x003244, dma_put);
 					nv_wr32(dev, 0x003328, ho_put);
 				} else
 				if (ib_get != ib_put) {
 					nv_wr32(dev, 0x003334, ib_put);
 				}
 			} else {
 				NV_INFO(dev, "PFIFO_DMA_PUSHER - Ch %d Get 0x%08x "
 					     "Put 0x%08x State 0x%08x Push 0x%08x\n",
 					chid, dma_get, dma_put, state, push);

 				if (dma_get != dma_put)
 					nv_wr32(dev, 0x003244, dma_put);
 			}

 			nv_wr32(dev, 0x003228, 0x00000000);
 			nv_wr32(dev, 0x003220, 0x00000001);
 			nv_wr32(dev, 0x002100, NV_PFIFO_INTR_DMA_PUSHER);
 			status &= ~NV_PFIFO_INTR_DMA_PUSHER;
 		}

 		if (status & NV_PFIFO_INTR_SEMAPHORE) {
 			uint32_t sem;

 			status &= ~NV_PFIFO_INTR_SEMAPHORE;
 			nv_wr32(dev, NV03_PFIFO_INTR_0,
 				NV_PFIFO_INTR_SEMAPHORE);

 			sem = nv_rd32(dev, NV10_PFIFO_CACHE1_SEMAPHORE);
 			nv_wr32(dev, NV10_PFIFO_CACHE1_SEMAPHORE, sem | 0x1);

 			nv_wr32(dev, NV03_PFIFO_CACHE1_GET, get + 4);
 			nv_wr32(dev, NV04_PFIFO_CACHE1_PULL0, 1);
 		}

 		if (dev_priv->card_type == NV_50) {
 			if (status & 0x00000010) {
 				nv50_fb_vm_trap(dev, 1, "PFIFO_BAR_FAULT");
 				status &= ~0x00000010;
 				nv_wr32(dev, 0x002100, 0x00000010);
 			}
 		}

 		if (status) {
 			if (nouveau_ratelimit())
 				NV_INFO(dev, "PFIFO_INTR 0x%08x - Ch %d\n",
 					status, chid);
 			nv_wr32(dev, NV03_PFIFO_INTR_0, status);
 			status = 0;
 		}

 		nv_wr32(dev, NV03_PFIFO_CACHES, reassign);
 	}

 	if (status) {
 		NV_INFO(dev, "PFIFO still angry after %d spins, halt\n", cnt);
 		nv_wr32(dev, 0x2140, 0);
 		nv_wr32(dev, 0x140, 0);
 	}

 	nv_wr32(dev, NV03_PMC_INTR_0, NV_PMC_INTR_0_PFIFO_PENDING);
 }
	/*
	* 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 "drmP.h"
	#include "drm.h"
	#include "nouveau_drv.h"
	#include "nouveau_ramht.h"
	#include "nouveau_util.h"

	#define NV04_RAMFC(c) (dev_priv->ramfc->pinst + ((c) * NV04_RAMFC__SIZE))
	#define NV04_RAMFC__SIZE 32
	#define NV04_RAMFC_DMA_PUT 0x00
	#define NV04_RAMFC_DMA_GET 0x04
	#define NV04_RAMFC_DMA_INSTANCE 0x08
	#define NV04_RAMFC_DMA_STATE 0x0C
	#define NV04_RAMFC_DMA_FETCH 0x10
	#define NV04_RAMFC_ENGINE 0x14
	#define NV04_RAMFC_PULL1_ENGINE 0x18

	#define RAMFC_WR(offset, val) nv_wo32(chan->ramfc, NV04_RAMFC_##offset, (val))
	#define RAMFC_RD(offset) nv_ro32(chan->ramfc, NV04_RAMFC_##offset)

	void
	nv04_fifo_disable(struct drm_device *dev)
	{
	uint32_t tmp;

	tmp = nv_rd32(dev, NV04_PFIFO_CACHE1_DMA_PUSH);
	nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_PUSH, tmp & ~1);
	nv_wr32(dev, NV03_PFIFO_CACHE1_PUSH0, 0);
	tmp = nv_rd32(dev, NV03_PFIFO_CACHE1_PULL1);
	nv_wr32(dev, NV04_PFIFO_CACHE1_PULL0, tmp & ~1);
	}

	void
	nv04_fifo_enable(struct drm_device *dev)
	{
	nv_wr32(dev, NV03_PFIFO_CACHE1_PUSH0, 1);
	nv_wr32(dev, NV04_PFIFO_CACHE1_PULL0, 1);
	}

	bool
	nv04_fifo_reassign(struct drm_device *dev, bool enable)
	{
	uint32_t reassign = nv_rd32(dev, NV03_PFIFO_CACHES);

	nv_wr32(dev, NV03_PFIFO_CACHES, enable ? 1 : 0);
	return (reassign == 1);
	}

	bool
	nv04_fifo_cache_pull(struct drm_device *dev, bool enable)
	{
	int pull = nv_mask(dev, NV04_PFIFO_CACHE1_PULL0, 1, enable);

	if (!enable) {
	/* In some cases the PFIFO puller may be left in an
	* inconsistent state if you try to stop it when it's
	* busy translating handles. Sometimes you get a
	* PFIFO_CACHE_ERROR, sometimes it just fails silently
	* sending incorrect instance offsets to PGRAPH after
	* it's started up again. To avoid the latter we
	* invalidate the most recently calculated instance.
	*/
	if (!nv_wait(dev, NV04_PFIFO_CACHE1_PULL0,
	NV04_PFIFO_CACHE1_PULL0_HASH_BUSY, 0))
	NV_ERROR(dev, "Timeout idling the PFIFO puller.\n");

	if (nv_rd32(dev, NV04_PFIFO_CACHE1_PULL0) &
	NV04_PFIFO_CACHE1_PULL0_HASH_FAILED)
	nv_wr32(dev, NV03_PFIFO_INTR_0,
	NV_PFIFO_INTR_CACHE_ERROR);

	nv_wr32(dev, NV04_PFIFO_CACHE1_HASH, 0);
	}

	return pull & 1;
	}

	int
	nv04_fifo_channel_id(struct drm_device *dev)
	{
	return nv_rd32(dev, NV03_PFIFO_CACHE1_PUSH1) &
	NV03_PFIFO_CACHE1_PUSH1_CHID_MASK;
	}

	#ifdef __BIG_ENDIAN
	#define DMA_FETCH_ENDIANNESS NV_PFIFO_CACHE1_BIG_ENDIAN
	#else
	#define DMA_FETCH_ENDIANNESS 0
	#endif

	int
	nv04_fifo_create_context(struct nouveau_channel *chan)
	{
	struct drm_device *dev = chan->dev;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	unsigned long flags;
	int ret;

	ret = nouveau_gpuobj_new_fake(dev, NV04_RAMFC(chan->id), ~0,
	NV04_RAMFC__SIZE,
	NVOBJ_FLAG_ZERO_ALLOC \|
	NVOBJ_FLAG_ZERO_FREE,
	&chan->ramfc);
	if (ret)
	return ret;

	spin_lock_irqsave(&dev_priv->context_switch_lock, flags);

	/* Setup initial state */
	RAMFC_WR(DMA_PUT, chan->pushbuf_base);
	RAMFC_WR(DMA_GET, chan->pushbuf_base);
	RAMFC_WR(DMA_INSTANCE, chan->pushbuf->pinst >> 4);
	RAMFC_WR(DMA_FETCH, (NV_PFIFO_CACHE1_DMA_FETCH_TRIG_128_BYTES \|
	NV_PFIFO_CACHE1_DMA_FETCH_SIZE_128_BYTES \|
	NV_PFIFO_CACHE1_DMA_FETCH_MAX_REQS_8 \|
	DMA_FETCH_ENDIANNESS));

	/* enable the fifo dma operation */
	nv_wr32(dev, NV04_PFIFO_MODE,
	nv_rd32(dev, NV04_PFIFO_MODE) \| (1 << chan->id));

	spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
	return 0;
	}

	void
	nv04_fifo_destroy_context(struct nouveau_channel *chan)
	{
	struct drm_device *dev = chan->dev;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_fifo_engine *pfifo = &dev_priv->engine.fifo;
	unsigned long flags;

	spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
	pfifo->reassign(dev, false);

	/* Unload the context if it's the currently active one */
	if (pfifo->channel_id(dev) == chan->id) {
	pfifo->disable(dev);
	pfifo->unload_context(dev);
	pfifo->enable(dev);
	}

	/* Keep it from being rescheduled */
	nv_mask(dev, NV04_PFIFO_MODE, 1 << chan->id, 0);

	pfifo->reassign(dev, true);
	spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);

	/* Free the channel resources */
	nouveau_gpuobj_ref(NULL, &chan->ramfc);
	}

	static void
	nv04_fifo_do_load_context(struct drm_device *dev, int chid)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	uint32_t fc = NV04_RAMFC(chid), tmp;

	nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_PUT, nv_ri32(dev, fc + 0));
	nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_GET, nv_ri32(dev, fc + 4));
	tmp = nv_ri32(dev, fc + 8);
	nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_INSTANCE, tmp & 0xFFFF);
	nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_DCOUNT, tmp >> 16);
	nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_STATE, nv_ri32(dev, fc + 12));
	nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_FETCH, nv_ri32(dev, fc + 16));
	nv_wr32(dev, NV04_PFIFO_CACHE1_ENGINE, nv_ri32(dev, fc + 20));
	nv_wr32(dev, NV04_PFIFO_CACHE1_PULL1, nv_ri32(dev, fc + 24));

	nv_wr32(dev, NV03_PFIFO_CACHE1_GET, 0);
	nv_wr32(dev, NV03_PFIFO_CACHE1_PUT, 0);
	}

	int
	nv04_fifo_load_context(struct nouveau_channel *chan)
	{
	uint32_t tmp;

	nv_wr32(chan->dev, NV03_PFIFO_CACHE1_PUSH1,
	NV03_PFIFO_CACHE1_PUSH1_DMA \| chan->id);
	nv04_fifo_do_load_context(chan->dev, chan->id);
	nv_wr32(chan->dev, NV04_PFIFO_CACHE1_DMA_PUSH, 1);

	/* Reset NV04_PFIFO_CACHE1_DMA_CTL_AT_INFO to INVALID */
	tmp = nv_rd32(chan->dev, NV04_PFIFO_CACHE1_DMA_CTL) & ~(1 << 31);
	nv_wr32(chan->dev, NV04_PFIFO_CACHE1_DMA_CTL, tmp);

	return 0;
	}

	int
	nv04_fifo_unload_context(struct drm_device *dev)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_fifo_engine *pfifo = &dev_priv->engine.fifo;
	struct nouveau_channel *chan = NULL;
	uint32_t tmp;
	int chid;

	chid = pfifo->channel_id(dev);
	if (chid < 0 \|\| chid >= dev_priv->engine.fifo.channels)
	return 0;

	chan = dev_priv->channels.ptr[chid];
	if (!chan) {
	NV_ERROR(dev, "Inactive channel on PFIFO: %d\n", chid);
	return -EINVAL;
	}

	RAMFC_WR(DMA_PUT, nv_rd32(dev, NV04_PFIFO_CACHE1_DMA_PUT));
	RAMFC_WR(DMA_GET, nv_rd32(dev, NV04_PFIFO_CACHE1_DMA_GET));
	tmp = nv_rd32(dev, NV04_PFIFO_CACHE1_DMA_DCOUNT) << 16;
	tmp \|= nv_rd32(dev, NV04_PFIFO_CACHE1_DMA_INSTANCE);
	RAMFC_WR(DMA_INSTANCE, tmp);
	RAMFC_WR(DMA_STATE, nv_rd32(dev, NV04_PFIFO_CACHE1_DMA_STATE));
	RAMFC_WR(DMA_FETCH, nv_rd32(dev, NV04_PFIFO_CACHE1_DMA_FETCH));
	RAMFC_WR(ENGINE, nv_rd32(dev, NV04_PFIFO_CACHE1_ENGINE));
	RAMFC_WR(PULL1_ENGINE, nv_rd32(dev, NV04_PFIFO_CACHE1_PULL1));

	nv04_fifo_do_load_context(dev, pfifo->channels - 1);
	nv_wr32(dev, NV03_PFIFO_CACHE1_PUSH1, pfifo->channels - 1);
	return 0;
	}

	static void
	nv04_fifo_init_reset(struct drm_device *dev)
	{
	nv_wr32(dev, NV03_PMC_ENABLE,
	nv_rd32(dev, NV03_PMC_ENABLE) & ~NV_PMC_ENABLE_PFIFO);
	nv_wr32(dev, NV03_PMC_ENABLE,
	nv_rd32(dev, NV03_PMC_ENABLE) \| NV_PMC_ENABLE_PFIFO);

	nv_wr32(dev, 0x003224, 0x000f0078);
	nv_wr32(dev, 0x002044, 0x0101ffff);
	nv_wr32(dev, 0x002040, 0x000000ff);
	nv_wr32(dev, 0x002500, 0x00000000);
	nv_wr32(dev, 0x003000, 0x00000000);
	nv_wr32(dev, 0x003050, 0x00000000);
	nv_wr32(dev, 0x003200, 0x00000000);
	nv_wr32(dev, 0x003250, 0x00000000);
	nv_wr32(dev, 0x003220, 0x00000000);

	nv_wr32(dev, 0x003250, 0x00000000);
	nv_wr32(dev, 0x003270, 0x00000000);
	nv_wr32(dev, 0x003210, 0x00000000);
	}

	static void
	nv04_fifo_init_ramxx(struct drm_device *dev)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;

	nv_wr32(dev, NV03_PFIFO_RAMHT, (0x03 << 24) /* search 128 */ \|
	((dev_priv->ramht->bits - 9) << 16) \|
	(dev_priv->ramht->gpuobj->pinst >> 8));
	nv_wr32(dev, NV03_PFIFO_RAMRO, dev_priv->ramro->pinst >> 8);
	nv_wr32(dev, NV03_PFIFO_RAMFC, dev_priv->ramfc->pinst >> 8);
	}

	static void
	nv04_fifo_init_intr(struct drm_device *dev)
	{
	nouveau_irq_register(dev, 8, nv04_fifo_isr);
	nv_wr32(dev, 0x002100, 0xffffffff);
	nv_wr32(dev, 0x002140, 0xffffffff);
	}

	int
	nv04_fifo_init(struct drm_device *dev)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_fifo_engine *pfifo = &dev_priv->engine.fifo;
	int i;

	nv04_fifo_init_reset(dev);
	nv04_fifo_init_ramxx(dev);

	nv04_fifo_do_load_context(dev, pfifo->channels - 1);
	nv_wr32(dev, NV03_PFIFO_CACHE1_PUSH1, pfifo->channels - 1);

	nv04_fifo_init_intr(dev);
	pfifo->enable(dev);
	pfifo->reassign(dev, true);

	for (i = 0; i < dev_priv->engine.fifo.channels; i++) {
	if (dev_priv->channels.ptr[i]) {
	uint32_t mode = nv_rd32(dev, NV04_PFIFO_MODE);
	nv_wr32(dev, NV04_PFIFO_MODE, mode \| (1 << i));
	}
	}

	return 0;
	}

	void
	nv04_fifo_fini(struct drm_device *dev)
	{
	nv_wr32(dev, 0x2140, 0x00000000);
	nouveau_irq_unregister(dev, 8);
	}

	static bool
	nouveau_fifo_swmthd(struct drm_device *dev, u32 chid, u32 addr, u32 data)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_channel *chan = NULL;
	struct nouveau_gpuobj *obj;
	unsigned long flags;
	const int subc = (addr >> 13) & 0x7;
	const int mthd = addr & 0x1ffc;
	bool handled = false;
	u32 engine;

	spin_lock_irqsave(&dev_priv->channels.lock, flags);
	if (likely(chid >= 0 && chid < dev_priv->engine.fifo.channels))
	chan = dev_priv->channels.ptr[chid];
	if (unlikely(!chan))
	goto out;

	switch (mthd) {
	case 0x0000: /* bind object to subchannel */
	obj = nouveau_ramht_find(chan, data);
	if (unlikely(!obj \|\| obj->engine != NVOBJ_ENGINE_SW))
	break;

	chan->sw_subchannel[subc] = obj->class;
	engine = 0x0000000f << (subc * 4);

	nv_mask(dev, NV04_PFIFO_CACHE1_ENGINE, engine, 0x00000000);
	handled = true;
	break;
	default:
	engine = nv_rd32(dev, NV04_PFIFO_CACHE1_ENGINE);
	if (unlikely(((engine >> (subc * 4)) & 0xf) != 0))
	break;

	if (!nouveau_gpuobj_mthd_call(chan, chan->sw_subchannel[subc],
	mthd, data))
	handled = true;
	break;
	}

	out:
	spin_unlock_irqrestore(&dev_priv->channels.lock, flags);
	return handled;
	}

	void
	nv04_fifo_isr(struct drm_device *dev)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_engine *engine = &dev_priv->engine;
	uint32_t status, reassign;
	int cnt = 0;

	reassign = nv_rd32(dev, NV03_PFIFO_CACHES) & 1;
	while ((status = nv_rd32(dev, NV03_PFIFO_INTR_0)) && (cnt++ < 100)) {
	uint32_t chid, get;

	nv_wr32(dev, NV03_PFIFO_CACHES, 0);

	chid = engine->fifo.channel_id(dev);
	get = nv_rd32(dev, NV03_PFIFO_CACHE1_GET);

	if (status & NV_PFIFO_INTR_CACHE_ERROR) {
	uint32_t mthd, data;
	int ptr;

	/* NV_PFIFO_CACHE1_GET actually goes to 0xffc before
	* wrapping on my G80 chips, but CACHE1 isn't big
	* enough for this much data.. Tests show that it
	* wraps around to the start at GET=0x800.. No clue
	* as to why..
	*/
	ptr = (get & 0x7ff) >> 2;

	if (dev_priv->card_type < NV_40) {
	mthd = nv_rd32(dev,
	NV04_PFIFO_CACHE1_METHOD(ptr));
	data = nv_rd32(dev,
	NV04_PFIFO_CACHE1_DATA(ptr));
	} else {
	mthd = nv_rd32(dev,
	NV40_PFIFO_CACHE1_METHOD(ptr));
	data = nv_rd32(dev,
	NV40_PFIFO_CACHE1_DATA(ptr));
	}

	if (!nouveau_fifo_swmthd(dev, chid, mthd, data)) {
	NV_INFO(dev, "PFIFO_CACHE_ERROR - Ch %d/%d "
	"Mthd 0x%04x Data 0x%08x\n",
	chid, (mthd >> 13) & 7, mthd & 0x1ffc,
	data);
	}

	nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_PUSH, 0);
	nv_wr32(dev, NV03_PFIFO_INTR_0,
	NV_PFIFO_INTR_CACHE_ERROR);

	nv_wr32(dev, NV03_PFIFO_CACHE1_PUSH0,
	nv_rd32(dev, NV03_PFIFO_CACHE1_PUSH0) & ~1);
	nv_wr32(dev, NV03_PFIFO_CACHE1_GET, get + 4);
	nv_wr32(dev, NV03_PFIFO_CACHE1_PUSH0,
	nv_rd32(dev, NV03_PFIFO_CACHE1_PUSH0) \| 1);
	nv_wr32(dev, NV04_PFIFO_CACHE1_HASH, 0);

	nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_PUSH,
	nv_rd32(dev, NV04_PFIFO_CACHE1_DMA_PUSH) \| 1);
	nv_wr32(dev, NV04_PFIFO_CACHE1_PULL0, 1);

	status &= ~NV_PFIFO_INTR_CACHE_ERROR;
	}

	if (status & NV_PFIFO_INTR_DMA_PUSHER) {
	u32 dma_get = nv_rd32(dev, 0x003244);
	u32 dma_put = nv_rd32(dev, 0x003240);
	u32 push = nv_rd32(dev, 0x003220);
	u32 state = nv_rd32(dev, 0x003228);

	if (dev_priv->card_type == NV_50) {
	u32 ho_get = nv_rd32(dev, 0x003328);
	u32 ho_put = nv_rd32(dev, 0x003320);
	u32 ib_get = nv_rd32(dev, 0x003334);
	u32 ib_put = nv_rd32(dev, 0x003330);

	if (nouveau_ratelimit())
	NV_INFO(dev, "PFIFO_DMA_PUSHER - Ch %d Get 0x%02x%08x "
	"Put 0x%02x%08x IbGet 0x%08x IbPut 0x%08x "
	"State 0x%08x Push 0x%08x\n",
	chid, ho_get, dma_get, ho_put,
	dma_put, ib_get, ib_put, state,
	push);

	/* METHOD_COUNT, in DMA_STATE on earlier chipsets */
	nv_wr32(dev, 0x003364, 0x00000000);
	if (dma_get != dma_put \|\| ho_get != ho_put) {
	nv_wr32(dev, 0x003244, dma_put);
	nv_wr32(dev, 0x003328, ho_put);
	} else
	if (ib_get != ib_put) {
	nv_wr32(dev, 0x003334, ib_put);
	}
	} else {
	NV_INFO(dev, "PFIFO_DMA_PUSHER - Ch %d Get 0x%08x "
	"Put 0x%08x State 0x%08x Push 0x%08x\n",
	chid, dma_get, dma_put, state, push);

	if (dma_get != dma_put)
	nv_wr32(dev, 0x003244, dma_put);
	}

	nv_wr32(dev, 0x003228, 0x00000000);
	nv_wr32(dev, 0x003220, 0x00000001);
	nv_wr32(dev, 0x002100, NV_PFIFO_INTR_DMA_PUSHER);
	status &= ~NV_PFIFO_INTR_DMA_PUSHER;
	}

	if (status & NV_PFIFO_INTR_SEMAPHORE) {
	uint32_t sem;

	status &= ~NV_PFIFO_INTR_SEMAPHORE;
	nv_wr32(dev, NV03_PFIFO_INTR_0,
	NV_PFIFO_INTR_SEMAPHORE);

	sem = nv_rd32(dev, NV10_PFIFO_CACHE1_SEMAPHORE);
	nv_wr32(dev, NV10_PFIFO_CACHE1_SEMAPHORE, sem \| 0x1);

	nv_wr32(dev, NV03_PFIFO_CACHE1_GET, get + 4);
	nv_wr32(dev, NV04_PFIFO_CACHE1_PULL0, 1);
	}

	if (dev_priv->card_type == NV_50) {
	if (status & 0x00000010) {
	nv50_fb_vm_trap(dev, 1, "PFIFO_BAR_FAULT");
	status &= ~0x00000010;
	nv_wr32(dev, 0x002100, 0x00000010);
	}
	}

	if (status) {
	if (nouveau_ratelimit())
	NV_INFO(dev, "PFIFO_INTR 0x%08x - Ch %d\n",
	status, chid);
	nv_wr32(dev, NV03_PFIFO_INTR_0, status);
	status = 0;
	}

	nv_wr32(dev, NV03_PFIFO_CACHES, reassign);
	}

	if (status) {
	NV_INFO(dev, "PFIFO still angry after %d spins, halt\n", cnt);
	nv_wr32(dev, 0x2140, 0);
	nv_wr32(dev, 0x140, 0);
	}

	nv_wr32(dev, NV03_PMC_INTR_0, NV_PMC_INTR_0_PFIFO_PENDING);
	}