drivers/gpu/drm/nouveau/nvc0_fifo.c - linux - Git at Google

 /*
  * Copyright 2010 Red Hat Inc.
  *
  * 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 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 HOLDER(S) OR AUTHOR(S) 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.
  *
  * Authors: Ben Skeggs
  */

 #include "drmP.h"

 #include "nouveau_drv.h"
 #include "nouveau_mm.h"

 static void nvc0_fifo_isr(struct drm_device *);

 struct nvc0_fifo_priv {
 	struct nouveau_gpuobj *playlist[2];
 	int cur_playlist;
 	struct nouveau_vma user_vma;
 	int spoon_nr;
 };

 struct nvc0_fifo_chan {
 	struct nouveau_gpuobj *user;
 	struct nouveau_gpuobj *ramfc;
 };

 static void
 nvc0_fifo_playlist_update(struct drm_device *dev)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_instmem_engine *pinstmem = &dev_priv->engine.instmem;
 	struct nouveau_fifo_engine *pfifo = &dev_priv->engine.fifo;
 	struct nvc0_fifo_priv *priv = pfifo->priv;
 	struct nouveau_gpuobj *cur;
 	int i, p;

 	cur = priv->playlist[priv->cur_playlist];
 	priv->cur_playlist = !priv->cur_playlist;

 	for (i = 0, p = 0; i < 128; i++) {
 		if (!(nv_rd32(dev, 0x3004 + (i * 8)) & 1))
 			continue;
 		nv_wo32(cur, p + 0, i);
 		nv_wo32(cur, p + 4, 0x00000004);
 		p += 8;
 	}
 	pinstmem->flush(dev);

 	nv_wr32(dev, 0x002270, cur->vinst >> 12);
 	nv_wr32(dev, 0x002274, 0x01f00000 | (p >> 3));
 	if (!nv_wait(dev, 0x00227c, 0x00100000, 0x00000000))
 		NV_ERROR(dev, "PFIFO - playlist update failed\n");
 }

 void
 nvc0_fifo_disable(struct drm_device *dev)
 {
 }

 void
 nvc0_fifo_enable(struct drm_device *dev)
 {
 }

 bool
 nvc0_fifo_reassign(struct drm_device *dev, bool enable)
 {
 	return false;
 }

 bool
 nvc0_fifo_cache_pull(struct drm_device *dev, bool enable)
 {
 	return false;
 }

 int
 nvc0_fifo_channel_id(struct drm_device *dev)
 {
 	return 127;
 }

 int
 nvc0_fifo_create_context(struct nouveau_channel *chan)
 {
 	struct drm_device *dev = chan->dev;
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_instmem_engine *pinstmem = &dev_priv->engine.instmem;
 	struct nouveau_fifo_engine *pfifo = &dev_priv->engine.fifo;
 	struct nvc0_fifo_priv *priv = pfifo->priv;
 	struct nvc0_fifo_chan *fifoch;
 	u64 ib_virt = chan->pushbuf_base + chan->dma.ib_base * 4;
 	int ret;

 	chan->fifo_priv = kzalloc(sizeof(*fifoch), GFP_KERNEL);
 	if (!chan->fifo_priv)
 		return -ENOMEM;
 	fifoch = chan->fifo_priv;

 	/* allocate vram for control regs, map into polling area */
 	ret = nouveau_gpuobj_new(dev, NULL, 0x1000, 0x1000,
 				 NVOBJ_FLAG_ZERO_ALLOC, &fifoch->user);
 	if (ret)
 		goto error;

 	nouveau_vm_map_at(&priv->user_vma, chan->id * 0x1000,
 			  *(struct nouveau_mem **)fifoch->user->node);

 	chan->user = ioremap_wc(pci_resource_start(dev->pdev, 1) +
 				priv->user_vma.offset + (chan->id * 0x1000),
 				PAGE_SIZE);
 	if (!chan->user) {
 		ret = -ENOMEM;
 		goto error;
 	}

 	/* ramfc */
 	ret = nouveau_gpuobj_new_fake(dev, chan->ramin->pinst,
 				      chan->ramin->vinst, 0x100,
 				      NVOBJ_FLAG_ZERO_ALLOC, &fifoch->ramfc);
 	if (ret)
 		goto error;

 	nv_wo32(fifoch->ramfc, 0x08, lower_32_bits(fifoch->user->vinst));
 	nv_wo32(fifoch->ramfc, 0x0c, upper_32_bits(fifoch->user->vinst));
 	nv_wo32(fifoch->ramfc, 0x10, 0x0000face);
 	nv_wo32(fifoch->ramfc, 0x30, 0xfffff902);
 	nv_wo32(fifoch->ramfc, 0x48, lower_32_bits(ib_virt));
 	nv_wo32(fifoch->ramfc, 0x4c, drm_order(chan->dma.ib_max + 1) << 16 |
 				   upper_32_bits(ib_virt));
 	nv_wo32(fifoch->ramfc, 0x54, 0x00000002);
 	nv_wo32(fifoch->ramfc, 0x84, 0x20400000);
 	nv_wo32(fifoch->ramfc, 0x94, 0x30000001);
 	nv_wo32(fifoch->ramfc, 0x9c, 0x00000100);
 	nv_wo32(fifoch->ramfc, 0xa4, 0x1f1f1f1f);
 	nv_wo32(fifoch->ramfc, 0xa8, 0x1f1f1f1f);
 	nv_wo32(fifoch->ramfc, 0xac, 0x0000001f);
 	nv_wo32(fifoch->ramfc, 0xb8, 0xf8000000);
 	nv_wo32(fifoch->ramfc, 0xf8, 0x10003080); /* 0x002310 */
 	nv_wo32(fifoch->ramfc, 0xfc, 0x10000010); /* 0x002350 */
 	pinstmem->flush(dev);

 	nv_wr32(dev, 0x003000 + (chan->id * 8), 0xc0000000 |
 						(chan->ramin->vinst >> 12));
 	nv_wr32(dev, 0x003004 + (chan->id * 8), 0x001f0001);
 	nvc0_fifo_playlist_update(dev);
 	return 0;

 error:
 	pfifo->destroy_context(chan);
 	return ret;
 }

 void
 nvc0_fifo_destroy_context(struct nouveau_channel *chan)
 {
 	struct drm_device *dev = chan->dev;
 	struct nvc0_fifo_chan *fifoch;

 	nv_mask(dev, 0x003004 + (chan->id * 8), 0x00000001, 0x00000000);
 	nv_wr32(dev, 0x002634, chan->id);
 	if (!nv_wait(dev, 0x0002634, 0xffffffff, chan->id))
 		NV_WARN(dev, "0x2634 != chid: 0x%08x\n", nv_rd32(dev, 0x2634));

 	nvc0_fifo_playlist_update(dev);

 	nv_wr32(dev, 0x003000 + (chan->id * 8), 0x00000000);

 	if (chan->user) {
 		iounmap(chan->user);
 		chan->user = NULL;
 	}

 	fifoch = chan->fifo_priv;
 	chan->fifo_priv = NULL;
 	if (!fifoch)
 		return;

 	nouveau_gpuobj_ref(NULL, &fifoch->ramfc);
 	nouveau_gpuobj_ref(NULL, &fifoch->user);
 	kfree(fifoch);
 }

 int
 nvc0_fifo_load_context(struct nouveau_channel *chan)
 {
 	return 0;
 }

 int
 nvc0_fifo_unload_context(struct drm_device *dev)
 {
 	int i;

 	for (i = 0; i < 128; i++) {
 		if (!(nv_rd32(dev, 0x003004 + (i * 4)) & 1))
 			continue;

 		nv_mask(dev, 0x003004 + (i * 4), 0x00000001, 0x00000000);
 		nv_wr32(dev, 0x002634, i);
 		if (!nv_wait(dev, 0x002634, 0xffffffff, i)) {
 			NV_INFO(dev, "PFIFO: kick ch %d failed: 0x%08x\n",
 				i, nv_rd32(dev, 0x002634));
 			return -EBUSY;
 		}
 	}

 	return 0;
 }

 static void
 nvc0_fifo_destroy(struct drm_device *dev)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_fifo_engine *pfifo = &dev_priv->engine.fifo;
 	struct nvc0_fifo_priv *priv;

 	priv = pfifo->priv;
 	if (!priv)
 		return;

 	nouveau_vm_put(&priv->user_vma);
 	nouveau_gpuobj_ref(NULL, &priv->playlist[1]);
 	nouveau_gpuobj_ref(NULL, &priv->playlist[0]);
 	kfree(priv);
 }

 void
 nvc0_fifo_takedown(struct drm_device *dev)
 {
 	nv_wr32(dev, 0x002140, 0x00000000);
 	nvc0_fifo_destroy(dev);
 }

 static int
 nvc0_fifo_create(struct drm_device *dev)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_fifo_engine *pfifo = &dev_priv->engine.fifo;
 	struct nvc0_fifo_priv *priv;
 	int ret;

 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
 	pfifo->priv = priv;

 	ret = nouveau_gpuobj_new(dev, NULL, 0x1000, 0x1000, 0,
 				 &priv->playlist[0]);
 	if (ret)
 		goto error;

 	ret = nouveau_gpuobj_new(dev, NULL, 0x1000, 0x1000, 0,
 				 &priv->playlist[1]);
 	if (ret)
 		goto error;

 	ret = nouveau_vm_get(dev_priv->bar1_vm, pfifo->channels * 0x1000,
 			     12, NV_MEM_ACCESS_RW, &priv->user_vma);
 	if (ret)
 		goto error;

 	nouveau_irq_register(dev, 8, nvc0_fifo_isr);
 	NVOBJ_CLASS(dev, 0x506e, SW); /* nvsw */
 	return 0;

 error:
 	nvc0_fifo_destroy(dev);
 	return ret;
 }

 int
 nvc0_fifo_init(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;
 	struct nvc0_fifo_priv *priv;
 	int ret, i;

 	if (!pfifo->priv) {
 		ret = nvc0_fifo_create(dev);
 		if (ret)
 			return ret;
 	}
 	priv = pfifo->priv;

 	/* reset PFIFO, enable all available PSUBFIFO areas */
 	nv_mask(dev, 0x000200, 0x00000100, 0x00000000);
 	nv_mask(dev, 0x000200, 0x00000100, 0x00000100);
 	nv_wr32(dev, 0x000204, 0xffffffff);
 	nv_wr32(dev, 0x002204, 0xffffffff);

 	priv->spoon_nr = hweight32(nv_rd32(dev, 0x002204));
 	NV_DEBUG(dev, "PFIFO: %d subfifo(s)\n", priv->spoon_nr);

 	/* assign engines to subfifos */
 	if (priv->spoon_nr >= 3) {
 		nv_wr32(dev, 0x002208, ~(1 << 0)); /* PGRAPH */
 		nv_wr32(dev, 0x00220c, ~(1 << 1)); /* PVP */
 		nv_wr32(dev, 0x002210, ~(1 << 1)); /* PPP */
 		nv_wr32(dev, 0x002214, ~(1 << 1)); /* PBSP */
 		nv_wr32(dev, 0x002218, ~(1 << 2)); /* PCE0 */
 		nv_wr32(dev, 0x00221c, ~(1 << 1)); /* PCE1 */
 	}

 	/* PSUBFIFO[n] */
 	for (i = 0; i < 3; i++) {
 		nv_mask(dev, 0x04013c + (i * 0x2000), 0x10000100, 0x00000000);
 		nv_wr32(dev, 0x040108 + (i * 0x2000), 0xffffffff); /* INTR */
 		nv_wr32(dev, 0x04010c + (i * 0x2000), 0xfffffeff); /* INTR_EN */
 	}

 	nv_mask(dev, 0x002200, 0x00000001, 0x00000001);
 	nv_wr32(dev, 0x002254, 0x10000000 | priv->user_vma.offset >> 12);

 	nv_wr32(dev, 0x002a00, 0xffffffff); /* clears PFIFO.INTR bit 30 */
 	nv_wr32(dev, 0x002100, 0xffffffff);
 	nv_wr32(dev, 0x002140, 0xbfffffff);

 	/* restore PFIFO context table */
 	for (i = 0; i < 128; i++) {
 		chan = dev_priv->channels.ptr[i];
 		if (!chan || !chan->fifo_priv)
 			continue;

 		nv_wr32(dev, 0x003000 + (i * 8), 0xc0000000 |
 						 (chan->ramin->vinst >> 12));
 		nv_wr32(dev, 0x003004 + (i * 8), 0x001f0001);
 	}
 	nvc0_fifo_playlist_update(dev);

 	return 0;
 }

 struct nouveau_enum nvc0_fifo_fault_unit[] = {
 	{ 0x00, "PGRAPH" },
 	{ 0x03, "PEEPHOLE" },
 	{ 0x04, "BAR1" },
 	{ 0x05, "BAR3" },
 	{ 0x07, "PFIFO" },
 	{ 0x10, "PBSP" },
 	{ 0x11, "PPPP" },
 	{ 0x13, "PCOUNTER" },
 	{ 0x14, "PVP" },
 	{ 0x15, "PCOPY0" },
 	{ 0x16, "PCOPY1" },
 	{ 0x17, "PDAEMON" },
 	{}
 };

 struct nouveau_enum nvc0_fifo_fault_reason[] = {
 	{ 0x00, "PT_NOT_PRESENT" },
 	{ 0x01, "PT_TOO_SHORT" },
 	{ 0x02, "PAGE_NOT_PRESENT" },
 	{ 0x03, "VM_LIMIT_EXCEEDED" },
 	{ 0x04, "NO_CHANNEL" },
 	{ 0x05, "PAGE_SYSTEM_ONLY" },
 	{ 0x06, "PAGE_READ_ONLY" },
 	{ 0x0a, "COMPRESSED_SYSRAM" },
 	{ 0x0c, "INVALID_STORAGE_TYPE" },
 	{}
 };

 struct nouveau_enum nvc0_fifo_fault_hubclient[] = {
 	{ 0x01, "PCOPY0" },
 	{ 0x02, "PCOPY1" },
 	{ 0x04, "DISPATCH" },
 	{ 0x05, "CTXCTL" },
 	{ 0x06, "PFIFO" },
 	{ 0x07, "BAR_READ" },
 	{ 0x08, "BAR_WRITE" },
 	{ 0x0b, "PVP" },
 	{ 0x0c, "PPPP" },
 	{ 0x0d, "PBSP" },
 	{ 0x11, "PCOUNTER" },
 	{ 0x12, "PDAEMON" },
 	{ 0x14, "CCACHE" },
 	{ 0x15, "CCACHE_POST" },
 	{}
 };

 struct nouveau_enum nvc0_fifo_fault_gpcclient[] = {
 	{ 0x01, "TEX" },
 	{ 0x0c, "ESETUP" },
 	{ 0x0e, "CTXCTL" },
 	{ 0x0f, "PROP" },
 	{}
 };

 struct nouveau_bitfield nvc0_fifo_subfifo_intr[] = {
 /*	{ 0x00008000, "" }	seen with null ib push */
 	{ 0x00200000, "ILLEGAL_MTHD" },
 	{ 0x00800000, "EMPTY_SUBC" },
 	{}
 };

 static void
 nvc0_fifo_isr_vm_fault(struct drm_device *dev, int unit)
 {
 	u32 inst = nv_rd32(dev, 0x2800 + (unit * 0x10));
 	u32 valo = nv_rd32(dev, 0x2804 + (unit * 0x10));
 	u32 vahi = nv_rd32(dev, 0x2808 + (unit * 0x10));
 	u32 stat = nv_rd32(dev, 0x280c + (unit * 0x10));
 	u32 client = (stat & 0x00001f00) >> 8;

 	NV_INFO(dev, "PFIFO: %s fault at 0x%010llx [",
 		(stat & 0x00000080) ? "write" : "read", (u64)vahi << 32 | valo);
 	nouveau_enum_print(nvc0_fifo_fault_reason, stat & 0x0000000f);
 	printk("] from ");
 	nouveau_enum_print(nvc0_fifo_fault_unit, unit);
 	if (stat & 0x00000040) {
 		printk("/");
 		nouveau_enum_print(nvc0_fifo_fault_hubclient, client);
 	} else {
 		printk("/GPC%d/", (stat & 0x1f000000) >> 24);
 		nouveau_enum_print(nvc0_fifo_fault_gpcclient, client);
 	}
 	printk(" on channel 0x%010llx\n", (u64)inst << 12);
 }

 static void
 nvc0_fifo_isr_subfifo_intr(struct drm_device *dev, int unit)
 {
 	u32 stat = nv_rd32(dev, 0x040108 + (unit * 0x2000));
 	u32 addr = nv_rd32(dev, 0x0400c0 + (unit * 0x2000));
 	u32 data = nv_rd32(dev, 0x0400c4 + (unit * 0x2000));
 	u32 chid = nv_rd32(dev, 0x040120 + (unit * 0x2000)) & 0x7f;
 	u32 subc = (addr & 0x00070000);
 	u32 mthd = (addr & 0x00003ffc);

 	NV_INFO(dev, "PSUBFIFO %d:", unit);
 	nouveau_bitfield_print(nvc0_fifo_subfifo_intr, stat);
 	NV_INFO(dev, "PSUBFIFO %d: ch %d subc %d mthd 0x%04x data 0x%08x\n",
 		unit, chid, subc, mthd, data);

 	nv_wr32(dev, 0x0400c0 + (unit * 0x2000), 0x80600008);
 	nv_wr32(dev, 0x040108 + (unit * 0x2000), stat);
 }

 static void
 nvc0_fifo_isr(struct drm_device *dev)
 {
 	u32 stat = nv_rd32(dev, 0x002100);

 	if (stat & 0x00000100) {
 		NV_INFO(dev, "PFIFO: unknown status 0x00000100\n");
 		nv_wr32(dev, 0x002100, 0x00000100);
 		stat &= ~0x00000100;
 	}

 	if (stat & 0x10000000) {
 		u32 units = nv_rd32(dev, 0x00259c);
 		u32 u = units;

 		while (u) {
 			int i = ffs(u) - 1;
 			nvc0_fifo_isr_vm_fault(dev, i);
 			u &= ~(1 << i);
 		}

 		nv_wr32(dev, 0x00259c, units);
 		stat &= ~0x10000000;
 	}

 	if (stat & 0x20000000) {
 		u32 units = nv_rd32(dev, 0x0025a0);
 		u32 u = units;

 		while (u) {
 			int i = ffs(u) - 1;
 			nvc0_fifo_isr_subfifo_intr(dev, i);
 			u &= ~(1 << i);
 		}

 		nv_wr32(dev, 0x0025a0, units);
 		stat &= ~0x20000000;
 	}

 	if (stat & 0x40000000) {
 		NV_INFO(dev, "PFIFO: unknown status 0x40000000\n");
 		nv_mask(dev, 0x002a00, 0x00000000, 0x00000000);
 		stat &= ~0x40000000;
 	}

 	if (stat) {
 		NV_INFO(dev, "PFIFO: unhandled status 0x%08x\n", stat);
 		nv_wr32(dev, 0x002100, stat);
 		nv_wr32(dev, 0x002140, 0);
 	}
 }
	/*
	* Copyright 2010 Red Hat Inc.
	*
	* 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 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 HOLDER(S) OR AUTHOR(S) 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.
	*
	* Authors: Ben Skeggs
	*/

	#include "drmP.h"

	#include "nouveau_drv.h"
	#include "nouveau_mm.h"

	static void nvc0_fifo_isr(struct drm_device *);

	struct nvc0_fifo_priv {
	struct nouveau_gpuobj *playlist[2];
	int cur_playlist;
	struct nouveau_vma user_vma;
	int spoon_nr;
	};

	struct nvc0_fifo_chan {
	struct nouveau_gpuobj *user;
	struct nouveau_gpuobj *ramfc;
	};

	static void
	nvc0_fifo_playlist_update(struct drm_device *dev)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_instmem_engine *pinstmem = &dev_priv->engine.instmem;
	struct nouveau_fifo_engine *pfifo = &dev_priv->engine.fifo;
	struct nvc0_fifo_priv *priv = pfifo->priv;
	struct nouveau_gpuobj *cur;
	int i, p;

	cur = priv->playlist[priv->cur_playlist];
	priv->cur_playlist = !priv->cur_playlist;

	for (i = 0, p = 0; i < 128; i++) {
	if (!(nv_rd32(dev, 0x3004 + (i * 8)) & 1))
	continue;
	nv_wo32(cur, p + 0, i);
	nv_wo32(cur, p + 4, 0x00000004);
	p += 8;
	}
	pinstmem->flush(dev);

	nv_wr32(dev, 0x002270, cur->vinst >> 12);
	nv_wr32(dev, 0x002274, 0x01f00000 \| (p >> 3));
	if (!nv_wait(dev, 0x00227c, 0x00100000, 0x00000000))
	NV_ERROR(dev, "PFIFO - playlist update failed\n");
	}

	void
	nvc0_fifo_disable(struct drm_device *dev)
	{
	}

	void
	nvc0_fifo_enable(struct drm_device *dev)
	{
	}

	bool
	nvc0_fifo_reassign(struct drm_device *dev, bool enable)
	{
	return false;
	}

	bool
	nvc0_fifo_cache_pull(struct drm_device *dev, bool enable)
	{
	return false;
	}

	int
	nvc0_fifo_channel_id(struct drm_device *dev)
	{
	return 127;
	}

	int
	nvc0_fifo_create_context(struct nouveau_channel *chan)
	{
	struct drm_device *dev = chan->dev;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_instmem_engine *pinstmem = &dev_priv->engine.instmem;
	struct nouveau_fifo_engine *pfifo = &dev_priv->engine.fifo;
	struct nvc0_fifo_priv *priv = pfifo->priv;
	struct nvc0_fifo_chan *fifoch;
	u64 ib_virt = chan->pushbuf_base + chan->dma.ib_base * 4;
	int ret;

	chan->fifo_priv = kzalloc(sizeof(*fifoch), GFP_KERNEL);
	if (!chan->fifo_priv)
	return -ENOMEM;
	fifoch = chan->fifo_priv;

	/* allocate vram for control regs, map into polling area */
	ret = nouveau_gpuobj_new(dev, NULL, 0x1000, 0x1000,
	NVOBJ_FLAG_ZERO_ALLOC, &fifoch->user);
	if (ret)
	goto error;

	nouveau_vm_map_at(&priv->user_vma, chan->id * 0x1000,
	(struct nouveau_mem *)fifoch->user->node);

	chan->user = ioremap_wc(pci_resource_start(dev->pdev, 1) +
	priv->user_vma.offset + (chan->id * 0x1000),
	PAGE_SIZE);
	if (!chan->user) {
	ret = -ENOMEM;
	goto error;
	}

	/* ramfc */
	ret = nouveau_gpuobj_new_fake(dev, chan->ramin->pinst,
	chan->ramin->vinst, 0x100,
	NVOBJ_FLAG_ZERO_ALLOC, &fifoch->ramfc);
	if (ret)
	goto error;

	nv_wo32(fifoch->ramfc, 0x08, lower_32_bits(fifoch->user->vinst));
	nv_wo32(fifoch->ramfc, 0x0c, upper_32_bits(fifoch->user->vinst));
	nv_wo32(fifoch->ramfc, 0x10, 0x0000face);
	nv_wo32(fifoch->ramfc, 0x30, 0xfffff902);
	nv_wo32(fifoch->ramfc, 0x48, lower_32_bits(ib_virt));
	nv_wo32(fifoch->ramfc, 0x4c, drm_order(chan->dma.ib_max + 1) << 16 \|
	upper_32_bits(ib_virt));
	nv_wo32(fifoch->ramfc, 0x54, 0x00000002);
	nv_wo32(fifoch->ramfc, 0x84, 0x20400000);
	nv_wo32(fifoch->ramfc, 0x94, 0x30000001);
	nv_wo32(fifoch->ramfc, 0x9c, 0x00000100);
	nv_wo32(fifoch->ramfc, 0xa4, 0x1f1f1f1f);
	nv_wo32(fifoch->ramfc, 0xa8, 0x1f1f1f1f);
	nv_wo32(fifoch->ramfc, 0xac, 0x0000001f);
	nv_wo32(fifoch->ramfc, 0xb8, 0xf8000000);
	nv_wo32(fifoch->ramfc, 0xf8, 0x10003080); /* 0x002310 */
	nv_wo32(fifoch->ramfc, 0xfc, 0x10000010); /* 0x002350 */
	pinstmem->flush(dev);

	nv_wr32(dev, 0x003000 + (chan->id * 8), 0xc0000000 \|
	(chan->ramin->vinst >> 12));
	nv_wr32(dev, 0x003004 + (chan->id * 8), 0x001f0001);
	nvc0_fifo_playlist_update(dev);
	return 0;

	error:
	pfifo->destroy_context(chan);
	return ret;
	}

	void
	nvc0_fifo_destroy_context(struct nouveau_channel *chan)
	{
	struct drm_device *dev = chan->dev;
	struct nvc0_fifo_chan *fifoch;

	nv_mask(dev, 0x003004 + (chan->id * 8), 0x00000001, 0x00000000);
	nv_wr32(dev, 0x002634, chan->id);
	if (!nv_wait(dev, 0x0002634, 0xffffffff, chan->id))
	NV_WARN(dev, "0x2634 != chid: 0x%08x\n", nv_rd32(dev, 0x2634));

	nvc0_fifo_playlist_update(dev);

	nv_wr32(dev, 0x003000 + (chan->id * 8), 0x00000000);

	if (chan->user) {
	iounmap(chan->user);
	chan->user = NULL;
	}

	fifoch = chan->fifo_priv;
	chan->fifo_priv = NULL;
	if (!fifoch)
	return;

	nouveau_gpuobj_ref(NULL, &fifoch->ramfc);
	nouveau_gpuobj_ref(NULL, &fifoch->user);
	kfree(fifoch);
	}

	int
	nvc0_fifo_load_context(struct nouveau_channel *chan)
	{
	return 0;
	}

	int
	nvc0_fifo_unload_context(struct drm_device *dev)
	{
	int i;

	for (i = 0; i < 128; i++) {
	if (!(nv_rd32(dev, 0x003004 + (i * 4)) & 1))
	continue;

	nv_mask(dev, 0x003004 + (i * 4), 0x00000001, 0x00000000);
	nv_wr32(dev, 0x002634, i);
	if (!nv_wait(dev, 0x002634, 0xffffffff, i)) {
	NV_INFO(dev, "PFIFO: kick ch %d failed: 0x%08x\n",
	i, nv_rd32(dev, 0x002634));
	return -EBUSY;
	}
	}

	return 0;
	}

	static void
	nvc0_fifo_destroy(struct drm_device *dev)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_fifo_engine *pfifo = &dev_priv->engine.fifo;
	struct nvc0_fifo_priv *priv;

	priv = pfifo->priv;
	if (!priv)
	return;

	nouveau_vm_put(&priv->user_vma);
	nouveau_gpuobj_ref(NULL, &priv->playlist[1]);
	nouveau_gpuobj_ref(NULL, &priv->playlist[0]);
	kfree(priv);
	}

	void
	nvc0_fifo_takedown(struct drm_device *dev)
	{
	nv_wr32(dev, 0x002140, 0x00000000);
	nvc0_fifo_destroy(dev);
	}

	static int
	nvc0_fifo_create(struct drm_device *dev)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_fifo_engine *pfifo = &dev_priv->engine.fifo;
	struct nvc0_fifo_priv *priv;
	int ret;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
	return -ENOMEM;
	pfifo->priv = priv;

	ret = nouveau_gpuobj_new(dev, NULL, 0x1000, 0x1000, 0,
	&priv->playlist[0]);
	if (ret)
	goto error;

	ret = nouveau_gpuobj_new(dev, NULL, 0x1000, 0x1000, 0,
	&priv->playlist[1]);
	if (ret)
	goto error;

	ret = nouveau_vm_get(dev_priv->bar1_vm, pfifo->channels * 0x1000,
	12, NV_MEM_ACCESS_RW, &priv->user_vma);
	if (ret)
	goto error;

	nouveau_irq_register(dev, 8, nvc0_fifo_isr);
	NVOBJ_CLASS(dev, 0x506e, SW); /* nvsw */
	return 0;

	error:
	nvc0_fifo_destroy(dev);
	return ret;
	}

	int
	nvc0_fifo_init(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;
	struct nvc0_fifo_priv *priv;
	int ret, i;

	if (!pfifo->priv) {
	ret = nvc0_fifo_create(dev);
	if (ret)
	return ret;
	}
	priv = pfifo->priv;

	/* reset PFIFO, enable all available PSUBFIFO areas */
	nv_mask(dev, 0x000200, 0x00000100, 0x00000000);
	nv_mask(dev, 0x000200, 0x00000100, 0x00000100);
	nv_wr32(dev, 0x000204, 0xffffffff);
	nv_wr32(dev, 0x002204, 0xffffffff);

	priv->spoon_nr = hweight32(nv_rd32(dev, 0x002204));
	NV_DEBUG(dev, "PFIFO: %d subfifo(s)\n", priv->spoon_nr);

	/* assign engines to subfifos */
	if (priv->spoon_nr >= 3) {
	nv_wr32(dev, 0x002208, ~(1 << 0)); /* PGRAPH */
	nv_wr32(dev, 0x00220c, ~(1 << 1)); /* PVP */
	nv_wr32(dev, 0x002210, ~(1 << 1)); /* PPP */
	nv_wr32(dev, 0x002214, ~(1 << 1)); /* PBSP */
	nv_wr32(dev, 0x002218, ~(1 << 2)); /* PCE0 */
	nv_wr32(dev, 0x00221c, ~(1 << 1)); /* PCE1 */
	}

	/* PSUBFIFO[n] */
	for (i = 0; i < 3; i++) {
	nv_mask(dev, 0x04013c + (i * 0x2000), 0x10000100, 0x00000000);
	nv_wr32(dev, 0x040108 + (i * 0x2000), 0xffffffff); /* INTR */
	nv_wr32(dev, 0x04010c + (i * 0x2000), 0xfffffeff); /* INTR_EN */
	}

	nv_mask(dev, 0x002200, 0x00000001, 0x00000001);
	nv_wr32(dev, 0x002254, 0x10000000 \| priv->user_vma.offset >> 12);

	nv_wr32(dev, 0x002a00, 0xffffffff); /* clears PFIFO.INTR bit 30 */
	nv_wr32(dev, 0x002100, 0xffffffff);
	nv_wr32(dev, 0x002140, 0xbfffffff);

	/* restore PFIFO context table */
	for (i = 0; i < 128; i++) {
	chan = dev_priv->channels.ptr[i];
	if (!chan \|\| !chan->fifo_priv)
	continue;

	nv_wr32(dev, 0x003000 + (i * 8), 0xc0000000 \|
	(chan->ramin->vinst >> 12));
	nv_wr32(dev, 0x003004 + (i * 8), 0x001f0001);
	}
	nvc0_fifo_playlist_update(dev);

	return 0;
	}

	struct nouveau_enum nvc0_fifo_fault_unit[] = {
	{ 0x00, "PGRAPH" },
	{ 0x03, "PEEPHOLE" },
	{ 0x04, "BAR1" },
	{ 0x05, "BAR3" },
	{ 0x07, "PFIFO" },
	{ 0x10, "PBSP" },
	{ 0x11, "PPPP" },
	{ 0x13, "PCOUNTER" },
	{ 0x14, "PVP" },
	{ 0x15, "PCOPY0" },
	{ 0x16, "PCOPY1" },
	{ 0x17, "PDAEMON" },
	{}
	};

	struct nouveau_enum nvc0_fifo_fault_reason[] = {
	{ 0x00, "PT_NOT_PRESENT" },
	{ 0x01, "PT_TOO_SHORT" },
	{ 0x02, "PAGE_NOT_PRESENT" },
	{ 0x03, "VM_LIMIT_EXCEEDED" },
	{ 0x04, "NO_CHANNEL" },
	{ 0x05, "PAGE_SYSTEM_ONLY" },
	{ 0x06, "PAGE_READ_ONLY" },
	{ 0x0a, "COMPRESSED_SYSRAM" },
	{ 0x0c, "INVALID_STORAGE_TYPE" },
	{}
	};

	struct nouveau_enum nvc0_fifo_fault_hubclient[] = {
	{ 0x01, "PCOPY0" },
	{ 0x02, "PCOPY1" },
	{ 0x04, "DISPATCH" },
	{ 0x05, "CTXCTL" },
	{ 0x06, "PFIFO" },
	{ 0x07, "BAR_READ" },
	{ 0x08, "BAR_WRITE" },
	{ 0x0b, "PVP" },
	{ 0x0c, "PPPP" },
	{ 0x0d, "PBSP" },
	{ 0x11, "PCOUNTER" },
	{ 0x12, "PDAEMON" },
	{ 0x14, "CCACHE" },
	{ 0x15, "CCACHE_POST" },
	{}
	};

	struct nouveau_enum nvc0_fifo_fault_gpcclient[] = {
	{ 0x01, "TEX" },
	{ 0x0c, "ESETUP" },
	{ 0x0e, "CTXCTL" },
	{ 0x0f, "PROP" },
	{}
	};

	struct nouveau_bitfield nvc0_fifo_subfifo_intr[] = {
	/* { 0x00008000, "" } seen with null ib push */
	{ 0x00200000, "ILLEGAL_MTHD" },
	{ 0x00800000, "EMPTY_SUBC" },
	{}
	};

	static void
	nvc0_fifo_isr_vm_fault(struct drm_device *dev, int unit)
	{
	u32 inst = nv_rd32(dev, 0x2800 + (unit * 0x10));
	u32 valo = nv_rd32(dev, 0x2804 + (unit * 0x10));
	u32 vahi = nv_rd32(dev, 0x2808 + (unit * 0x10));
	u32 stat = nv_rd32(dev, 0x280c + (unit * 0x10));
	u32 client = (stat & 0x00001f00) >> 8;

	NV_INFO(dev, "PFIFO: %s fault at 0x%010llx [",
	(stat & 0x00000080) ? "write" : "read", (u64)vahi << 32 \| valo);
	nouveau_enum_print(nvc0_fifo_fault_reason, stat & 0x0000000f);
	printk("] from ");
	nouveau_enum_print(nvc0_fifo_fault_unit, unit);
	if (stat & 0x00000040) {
	printk("/");
	nouveau_enum_print(nvc0_fifo_fault_hubclient, client);
	} else {
	printk("/GPC%d/", (stat & 0x1f000000) >> 24);
	nouveau_enum_print(nvc0_fifo_fault_gpcclient, client);
	}
	printk(" on channel 0x%010llx\n", (u64)inst << 12);
	}

	static void
	nvc0_fifo_isr_subfifo_intr(struct drm_device *dev, int unit)
	{
	u32 stat = nv_rd32(dev, 0x040108 + (unit * 0x2000));
	u32 addr = nv_rd32(dev, 0x0400c0 + (unit * 0x2000));
	u32 data = nv_rd32(dev, 0x0400c4 + (unit * 0x2000));
	u32 chid = nv_rd32(dev, 0x040120 + (unit * 0x2000)) & 0x7f;
	u32 subc = (addr & 0x00070000);
	u32 mthd = (addr & 0x00003ffc);

	NV_INFO(dev, "PSUBFIFO %d:", unit);
	nouveau_bitfield_print(nvc0_fifo_subfifo_intr, stat);
	NV_INFO(dev, "PSUBFIFO %d: ch %d subc %d mthd 0x%04x data 0x%08x\n",
	unit, chid, subc, mthd, data);

	nv_wr32(dev, 0x0400c0 + (unit * 0x2000), 0x80600008);
	nv_wr32(dev, 0x040108 + (unit * 0x2000), stat);
	}

	static void
	nvc0_fifo_isr(struct drm_device *dev)
	{
	u32 stat = nv_rd32(dev, 0x002100);

	if (stat & 0x00000100) {
	NV_INFO(dev, "PFIFO: unknown status 0x00000100\n");
	nv_wr32(dev, 0x002100, 0x00000100);
	stat &= ~0x00000100;
	}

	if (stat & 0x10000000) {
	u32 units = nv_rd32(dev, 0x00259c);
	u32 u = units;

	while (u) {
	int i = ffs(u) - 1;
	nvc0_fifo_isr_vm_fault(dev, i);
	u &= ~(1 << i);
	}

	nv_wr32(dev, 0x00259c, units);
	stat &= ~0x10000000;
	}

	if (stat & 0x20000000) {
	u32 units = nv_rd32(dev, 0x0025a0);
	u32 u = units;

	while (u) {
	int i = ffs(u) - 1;
	nvc0_fifo_isr_subfifo_intr(dev, i);
	u &= ~(1 << i);
	}

	nv_wr32(dev, 0x0025a0, units);
	stat &= ~0x20000000;
	}

	if (stat & 0x40000000) {
	NV_INFO(dev, "PFIFO: unknown status 0x40000000\n");
	nv_mask(dev, 0x002a00, 0x00000000, 0x00000000);
	stat &= ~0x40000000;
	}

	if (stat) {
	NV_INFO(dev, "PFIFO: unhandled status 0x%08x\n", stat);
	nv_wr32(dev, 0x002100, stat);
	nv_wr32(dev, 0x002140, 0);
	}
	}