drivers/gpu/drm/nouveau/nouveau_irq.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (C) 2006 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.
  *
  */

 /*
  * Authors:
  *   Ben Skeggs <darktama@iinet.net.au>
  */

 #include "drmP.h"
 #include "drm.h"
 #include "nouveau_drm.h"
 #include "nouveau_drv.h"
 #include "nouveau_reg.h"
 #include <linux/ratelimit.h>

 /* needed for hotplug irq */
 #include "nouveau_connector.h"
 #include "nv50_display.h"

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

 	/* Master disable */
 	nv_wr32(dev, NV03_PMC_INTR_EN_0, 0);

 	if (dev_priv->card_type == NV_50) {
 		INIT_WORK(&dev_priv->irq_work, nv50_display_irq_handler_bh);
 		INIT_LIST_HEAD(&dev_priv->vbl_waiting);
 	}
 }

 int
 nouveau_irq_postinstall(struct drm_device *dev)
 {
 	/* Master enable */
 	nv_wr32(dev, NV03_PMC_INTR_EN_0, NV_PMC_INTR_EN_0_MASTER_ENABLE);
 	return 0;
 }

 void
 nouveau_irq_uninstall(struct drm_device *dev)
 {
 	/* Master disable */
 	nv_wr32(dev, NV03_PMC_INTR_EN_0, 0);
 }

 static int
 nouveau_call_method(struct nouveau_channel *chan, int class, int mthd, int data)
 {
 	struct drm_nouveau_private *dev_priv = chan->dev->dev_private;
 	struct nouveau_pgraph_object_method *grm;
 	struct nouveau_pgraph_object_class *grc;

 	grc = dev_priv->engine.graph.grclass;
 	while (grc->id) {
 		if (grc->id == class)
 			break;
 		grc++;
 	}

 	if (grc->id != class || !grc->methods)
 		return -ENOENT;

 	grm = grc->methods;
 	while (grm->id) {
 		if (grm->id == mthd)
 			return grm->exec(chan, class, mthd, data);
 		grm++;
 	}

 	return -ENOENT;
 }

 static bool
 nouveau_fifo_swmthd(struct nouveau_channel *chan, uint32_t addr, uint32_t data)
 {
 	struct drm_device *dev = chan->dev;
 	const int subc = (addr >> 13) & 0x7;
 	const int mthd = addr & 0x1ffc;

 	if (mthd == 0x0000) {
 		struct nouveau_gpuobj_ref *ref = NULL;

 		if (nouveau_gpuobj_ref_find(chan, data, &ref))
 			return false;

 		if (ref->gpuobj->engine != NVOBJ_ENGINE_SW)
 			return false;

 		chan->sw_subchannel[subc] = ref->gpuobj->class;
 		nv_wr32(dev, NV04_PFIFO_CACHE1_ENGINE, nv_rd32(dev,
 			NV04_PFIFO_CACHE1_ENGINE) & ~(0xf << subc * 4));
 		return true;
 	}

 	/* hw object */
 	if (nv_rd32(dev, NV04_PFIFO_CACHE1_ENGINE) & (1 << (subc*4)))
 		return false;

 	if (nouveau_call_method(chan, chan->sw_subchannel[subc], mthd, data))
 		return false;

 	return true;
 }

 static void
 nouveau_fifo_irq_handler(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)) {
 		struct nouveau_channel *chan = NULL;
 		uint32_t chid, get;

 		nv_wr32(dev, NV03_PFIFO_CACHES, 0);

 		chid = engine->fifo.channel_id(dev);
 		if (chid >= 0 && chid < engine->fifo.channels)
 			chan = dev_priv->fifos[chid];
 		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 (!chan || !nouveau_fifo_swmthd(chan, 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) {
 			NV_INFO(dev, "PFIFO_DMA_PUSHER - Ch %d\n", chid);

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

 			nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_STATE, 0x00000000);
 			if (nv_rd32(dev, NV04_PFIFO_CACHE1_DMA_PUT) != get)
 				nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_GET,
 								get + 4);
 		}

 		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 (status) {
 			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);
 }

 struct nouveau_bitfield_names {
 	uint32_t mask;
 	const char *name;
 };

 static struct nouveau_bitfield_names nstatus_names[] =
 {
 	{ NV04_PGRAPH_NSTATUS_STATE_IN_USE,       "STATE_IN_USE" },
 	{ NV04_PGRAPH_NSTATUS_INVALID_STATE,      "INVALID_STATE" },
 	{ NV04_PGRAPH_NSTATUS_BAD_ARGUMENT,       "BAD_ARGUMENT" },
 	{ NV04_PGRAPH_NSTATUS_PROTECTION_FAULT,   "PROTECTION_FAULT" }
 };

 static struct nouveau_bitfield_names nstatus_names_nv10[] =
 {
 	{ NV10_PGRAPH_NSTATUS_STATE_IN_USE,       "STATE_IN_USE" },
 	{ NV10_PGRAPH_NSTATUS_INVALID_STATE,      "INVALID_STATE" },
 	{ NV10_PGRAPH_NSTATUS_BAD_ARGUMENT,       "BAD_ARGUMENT" },
 	{ NV10_PGRAPH_NSTATUS_PROTECTION_FAULT,   "PROTECTION_FAULT" }
 };

 static struct nouveau_bitfield_names nsource_names[] =
 {
 	{ NV03_PGRAPH_NSOURCE_NOTIFICATION,       "NOTIFICATION" },
 	{ NV03_PGRAPH_NSOURCE_DATA_ERROR,         "DATA_ERROR" },
 	{ NV03_PGRAPH_NSOURCE_PROTECTION_ERROR,   "PROTECTION_ERROR" },
 	{ NV03_PGRAPH_NSOURCE_RANGE_EXCEPTION,    "RANGE_EXCEPTION" },
 	{ NV03_PGRAPH_NSOURCE_LIMIT_COLOR,        "LIMIT_COLOR" },
 	{ NV03_PGRAPH_NSOURCE_LIMIT_ZETA,         "LIMIT_ZETA" },
 	{ NV03_PGRAPH_NSOURCE_ILLEGAL_MTHD,       "ILLEGAL_MTHD" },
 	{ NV03_PGRAPH_NSOURCE_DMA_R_PROTECTION,   "DMA_R_PROTECTION" },
 	{ NV03_PGRAPH_NSOURCE_DMA_W_PROTECTION,   "DMA_W_PROTECTION" },
 	{ NV03_PGRAPH_NSOURCE_FORMAT_EXCEPTION,   "FORMAT_EXCEPTION" },
 	{ NV03_PGRAPH_NSOURCE_PATCH_EXCEPTION,    "PATCH_EXCEPTION" },
 	{ NV03_PGRAPH_NSOURCE_STATE_INVALID,      "STATE_INVALID" },
 	{ NV03_PGRAPH_NSOURCE_DOUBLE_NOTIFY,      "DOUBLE_NOTIFY" },
 	{ NV03_PGRAPH_NSOURCE_NOTIFY_IN_USE,      "NOTIFY_IN_USE" },
 	{ NV03_PGRAPH_NSOURCE_METHOD_CNT,         "METHOD_CNT" },
 	{ NV03_PGRAPH_NSOURCE_BFR_NOTIFICATION,   "BFR_NOTIFICATION" },
 	{ NV03_PGRAPH_NSOURCE_DMA_VTX_PROTECTION, "DMA_VTX_PROTECTION" },
 	{ NV03_PGRAPH_NSOURCE_DMA_WIDTH_A,        "DMA_WIDTH_A" },
 	{ NV03_PGRAPH_NSOURCE_DMA_WIDTH_B,        "DMA_WIDTH_B" },
 };

 static void
 nouveau_print_bitfield_names_(uint32_t value,
 				const struct nouveau_bitfield_names *namelist,
 				const int namelist_len)
 {
 	/*
 	 * Caller must have already printed the KERN_* log level for us.
 	 * Also the caller is responsible for adding the newline.
 	 */
 	int i;
 	for (i = 0; i < namelist_len; ++i) {
 		uint32_t mask = namelist[i].mask;
 		if (value & mask) {
 			printk(" %s", namelist[i].name);
 			value &= ~mask;
 		}
 	}
 	if (value)
 		printk(" (unknown bits 0x%08x)", value);
 }
 #define nouveau_print_bitfield_names(val, namelist) \
 	nouveau_print_bitfield_names_((val), (namelist), ARRAY_SIZE(namelist))


 static int
 nouveau_graph_chid_from_grctx(struct drm_device *dev)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	uint32_t inst;
 	int i;

 	if (dev_priv->card_type < NV_40)
 		return dev_priv->engine.fifo.channels;
 	else
 	if (dev_priv->card_type < NV_50) {
 		inst = (nv_rd32(dev, 0x40032c) & 0xfffff) << 4;

 		for (i = 0; i < dev_priv->engine.fifo.channels; i++) {
 			struct nouveau_channel *chan = dev_priv->fifos[i];

 			if (!chan || !chan->ramin_grctx)
 				continue;

 			if (inst == chan->ramin_grctx->instance)
 				break;
 		}
 	} else {
 		inst = (nv_rd32(dev, 0x40032c) & 0xfffff) << 12;

 		for (i = 0; i < dev_priv->engine.fifo.channels; i++) {
 			struct nouveau_channel *chan = dev_priv->fifos[i];

 			if (!chan || !chan->ramin)
 				continue;

 			if (inst == chan->ramin->instance)
 				break;
 		}
 	}


 	return i;
 }

 static int
 nouveau_graph_trapped_channel(struct drm_device *dev, int *channel_ret)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_engine *engine = &dev_priv->engine;
 	int channel;

 	if (dev_priv->card_type < NV_10)
 		channel = (nv_rd32(dev, NV04_PGRAPH_TRAPPED_ADDR) >> 24) & 0xf;
 	else
 	if (dev_priv->card_type < NV_40)
 		channel = (nv_rd32(dev, NV04_PGRAPH_TRAPPED_ADDR) >> 20) & 0x1f;
 	else
 		channel = nouveau_graph_chid_from_grctx(dev);

 	if (channel >= engine->fifo.channels || !dev_priv->fifos[channel]) {
 		NV_ERROR(dev, "AIII, invalid/inactive channel id %d\n", channel);
 		return -EINVAL;
 	}

 	*channel_ret = channel;
 	return 0;
 }

 struct nouveau_pgraph_trap {
 	int channel;
 	int class;
 	int subc, mthd, size;
 	uint32_t data, data2;
 	uint32_t nsource, nstatus;
 };

 static void
 nouveau_graph_trap_info(struct drm_device *dev,
 			struct nouveau_pgraph_trap *trap)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	uint32_t address;

 	trap->nsource = trap->nstatus = 0;
 	if (dev_priv->card_type < NV_50) {
 		trap->nsource = nv_rd32(dev, NV03_PGRAPH_NSOURCE);
 		trap->nstatus = nv_rd32(dev, NV03_PGRAPH_NSTATUS);
 	}

 	if (nouveau_graph_trapped_channel(dev, &trap->channel))
 		trap->channel = -1;
 	address = nv_rd32(dev, NV04_PGRAPH_TRAPPED_ADDR);

 	trap->mthd = address & 0x1FFC;
 	trap->data = nv_rd32(dev, NV04_PGRAPH_TRAPPED_DATA);
 	if (dev_priv->card_type < NV_10) {
 		trap->subc  = (address >> 13) & 0x7;
 	} else {
 		trap->subc  = (address >> 16) & 0x7;
 		trap->data2 = nv_rd32(dev, NV10_PGRAPH_TRAPPED_DATA_HIGH);
 	}

 	if (dev_priv->card_type < NV_10)
 		trap->class = nv_rd32(dev, 0x400180 + trap->subc*4) & 0xFF;
 	else if (dev_priv->card_type < NV_40)
 		trap->class = nv_rd32(dev, 0x400160 + trap->subc*4) & 0xFFF;
 	else if (dev_priv->card_type < NV_50)
 		trap->class = nv_rd32(dev, 0x400160 + trap->subc*4) & 0xFFFF;
 	else
 		trap->class = nv_rd32(dev, 0x400814);
 }

 static void
 nouveau_graph_dump_trap_info(struct drm_device *dev, const char *id,
 			     struct nouveau_pgraph_trap *trap)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	uint32_t nsource = trap->nsource, nstatus = trap->nstatus;

 	NV_INFO(dev, "%s - nSource:", id);
 	nouveau_print_bitfield_names(nsource, nsource_names);
 	printk(", nStatus:");
 	if (dev_priv->card_type < NV_10)
 		nouveau_print_bitfield_names(nstatus, nstatus_names);
 	else
 		nouveau_print_bitfield_names(nstatus, nstatus_names_nv10);
 	printk("\n");

 	NV_INFO(dev, "%s - Ch %d/%d Class 0x%04x Mthd 0x%04x "
 					"Data 0x%08x:0x%08x\n",
 					id, trap->channel, trap->subc,
 					trap->class, trap->mthd,
 					trap->data2, trap->data);
 }

 static int
 nouveau_pgraph_intr_swmthd(struct drm_device *dev,
 			   struct nouveau_pgraph_trap *trap)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;

 	if (trap->channel < 0 ||
 	    trap->channel >= dev_priv->engine.fifo.channels ||
 	    !dev_priv->fifos[trap->channel])
 		return -ENODEV;

 	return nouveau_call_method(dev_priv->fifos[trap->channel],
 				   trap->class, trap->mthd, trap->data);
 }

 static inline void
 nouveau_pgraph_intr_notify(struct drm_device *dev, uint32_t nsource)
 {
 	struct nouveau_pgraph_trap trap;
 	int unhandled = 0;

 	nouveau_graph_trap_info(dev, &trap);

 	if (nsource & NV03_PGRAPH_NSOURCE_ILLEGAL_MTHD) {
 		if (nouveau_pgraph_intr_swmthd(dev, &trap))
 			unhandled = 1;
 	} else {
 		unhandled = 1;
 	}

 	if (unhandled)
 		nouveau_graph_dump_trap_info(dev, "PGRAPH_NOTIFY", &trap);
 }

 static DEFINE_RATELIMIT_STATE(nouveau_ratelimit_state, 3 * HZ, 20);

 static int nouveau_ratelimit(void)
 {
 	return __ratelimit(&nouveau_ratelimit_state);
 }


 static inline void
 nouveau_pgraph_intr_error(struct drm_device *dev, uint32_t nsource)
 {
 	struct nouveau_pgraph_trap trap;
 	int unhandled = 0;

 	nouveau_graph_trap_info(dev, &trap);
 	trap.nsource = nsource;

 	if (nsource & NV03_PGRAPH_NSOURCE_ILLEGAL_MTHD) {
 		if (nouveau_pgraph_intr_swmthd(dev, &trap))
 			unhandled = 1;
 	} else if (nsource & NV03_PGRAPH_NSOURCE_DMA_VTX_PROTECTION) {
 		uint32_t v = nv_rd32(dev, 0x402000);
 		nv_wr32(dev, 0x402000, v);

 		/* dump the error anyway for now: it's useful for
 		   Gallium development */
 		unhandled = 1;
 	} else {
 		unhandled = 1;
 	}

 	if (unhandled && nouveau_ratelimit())
 		nouveau_graph_dump_trap_info(dev, "PGRAPH_ERROR", &trap);
 }

 static inline void
 nouveau_pgraph_intr_context_switch(struct drm_device *dev)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_engine *engine = &dev_priv->engine;
 	uint32_t chid;

 	chid = engine->fifo.channel_id(dev);
 	NV_DEBUG(dev, "PGRAPH context switch interrupt channel %x\n", chid);

 	switch (dev_priv->card_type) {
 	case NV_04:
 		nv04_graph_context_switch(dev);
 		break;
 	case NV_10:
 		nv10_graph_context_switch(dev);
 		break;
 	default:
 		NV_ERROR(dev, "Context switch not implemented\n");
 		break;
 	}
 }

 static void
 nouveau_pgraph_irq_handler(struct drm_device *dev)
 {
 	uint32_t status;

 	while ((status = nv_rd32(dev, NV03_PGRAPH_INTR))) {
 		uint32_t nsource = nv_rd32(dev, NV03_PGRAPH_NSOURCE);

 		if (status & NV_PGRAPH_INTR_NOTIFY) {
 			nouveau_pgraph_intr_notify(dev, nsource);

 			status &= ~NV_PGRAPH_INTR_NOTIFY;
 			nv_wr32(dev, NV03_PGRAPH_INTR, NV_PGRAPH_INTR_NOTIFY);
 		}

 		if (status & NV_PGRAPH_INTR_ERROR) {
 			nouveau_pgraph_intr_error(dev, nsource);

 			status &= ~NV_PGRAPH_INTR_ERROR;
 			nv_wr32(dev, NV03_PGRAPH_INTR, NV_PGRAPH_INTR_ERROR);
 		}

 		if (status & NV_PGRAPH_INTR_CONTEXT_SWITCH) {
 			nouveau_pgraph_intr_context_switch(dev);

 			status &= ~NV_PGRAPH_INTR_CONTEXT_SWITCH;
 			nv_wr32(dev, NV03_PGRAPH_INTR,
 				 NV_PGRAPH_INTR_CONTEXT_SWITCH);
 		}

 		if (status) {
 			NV_INFO(dev, "Unhandled PGRAPH_INTR - 0x%08x\n", status);
 			nv_wr32(dev, NV03_PGRAPH_INTR, status);
 		}

 		if ((nv_rd32(dev, NV04_PGRAPH_FIFO) & (1 << 0)) == 0)
 			nv_wr32(dev, NV04_PGRAPH_FIFO, 1);
 	}

 	nv_wr32(dev, NV03_PMC_INTR_0, NV_PMC_INTR_0_PGRAPH_PENDING);
 }

 static void
 nv50_pgraph_irq_handler(struct drm_device *dev)
 {
 	uint32_t status;

 	while ((status = nv_rd32(dev, NV03_PGRAPH_INTR))) {
 		uint32_t nsource = nv_rd32(dev, NV03_PGRAPH_NSOURCE);

 		if (status & 0x00000001) {
 			nouveau_pgraph_intr_notify(dev, nsource);
 			status &= ~0x00000001;
 			nv_wr32(dev, NV03_PGRAPH_INTR, 0x00000001);
 		}

 		if (status & 0x00000010) {
 			nouveau_pgraph_intr_error(dev, nsource |
 					NV03_PGRAPH_NSOURCE_ILLEGAL_MTHD);

 			status &= ~0x00000010;
 			nv_wr32(dev, NV03_PGRAPH_INTR, 0x00000010);
 		}

 		if (status & 0x00001000) {
 			nv_wr32(dev, 0x400500, 0x00000000);
 			nv_wr32(dev, NV03_PGRAPH_INTR,
 				NV_PGRAPH_INTR_CONTEXT_SWITCH);
 			nv_wr32(dev, NV40_PGRAPH_INTR_EN, nv_rd32(dev,
 				NV40_PGRAPH_INTR_EN) &
 				~NV_PGRAPH_INTR_CONTEXT_SWITCH);
 			nv_wr32(dev, 0x400500, 0x00010001);

 			nv50_graph_context_switch(dev);

 			status &= ~NV_PGRAPH_INTR_CONTEXT_SWITCH;
 		}

 		if (status & 0x00100000) {
 			nouveau_pgraph_intr_error(dev, nsource |
 					NV03_PGRAPH_NSOURCE_DATA_ERROR);

 			status &= ~0x00100000;
 			nv_wr32(dev, NV03_PGRAPH_INTR, 0x00100000);
 		}

 		if (status & 0x00200000) {
 			int r;

 			nouveau_pgraph_intr_error(dev, nsource |
 					NV03_PGRAPH_NSOURCE_PROTECTION_ERROR);

 			NV_ERROR(dev, "magic set 1:\n");
 			for (r = 0x408900; r <= 0x408910; r += 4)
 				NV_ERROR(dev, "\t0x%08x: 0x%08x\n", r,
 					nv_rd32(dev, r));
 			nv_wr32(dev, 0x408900,
 				nv_rd32(dev, 0x408904) | 0xc0000000);
 			for (r = 0x408e08; r <= 0x408e24; r += 4)
 				NV_ERROR(dev, "\t0x%08x: 0x%08x\n", r,
 							nv_rd32(dev, r));
 			nv_wr32(dev, 0x408e08,
 				nv_rd32(dev, 0x408e08) | 0xc0000000);

 			NV_ERROR(dev, "magic set 2:\n");
 			for (r = 0x409900; r <= 0x409910; r += 4)
 				NV_ERROR(dev, "\t0x%08x: 0x%08x\n", r,
 					nv_rd32(dev, r));
 			nv_wr32(dev, 0x409900,
 				nv_rd32(dev, 0x409904) | 0xc0000000);
 			for (r = 0x409e08; r <= 0x409e24; r += 4)
 				NV_ERROR(dev, "\t0x%08x: 0x%08x\n", r,
 					nv_rd32(dev, r));
 			nv_wr32(dev, 0x409e08,
 				nv_rd32(dev, 0x409e08) | 0xc0000000);

 			status &= ~0x00200000;
 			nv_wr32(dev, NV03_PGRAPH_NSOURCE, nsource);
 			nv_wr32(dev, NV03_PGRAPH_INTR, 0x00200000);
 		}

 		if (status) {
 			NV_INFO(dev, "Unhandled PGRAPH_INTR - 0x%08x\n",
 				status);
 			nv_wr32(dev, NV03_PGRAPH_INTR, status);
 		}

 		{
 			const int isb = (1 << 16) | (1 << 0);

 			if ((nv_rd32(dev, 0x400500) & isb) != isb)
 				nv_wr32(dev, 0x400500,
 					nv_rd32(dev, 0x400500) | isb);
 		}
 	}

 	nv_wr32(dev, NV03_PMC_INTR_0, NV_PMC_INTR_0_PGRAPH_PENDING);
 	nv_wr32(dev, 0x400824, nv_rd32(dev, 0x400824) & ~(1 << 31));
 }

 static void
 nouveau_crtc_irq_handler(struct drm_device *dev, int crtc)
 {
 	if (crtc & 1)
 		nv_wr32(dev, NV_CRTC0_INTSTAT, NV_CRTC_INTR_VBLANK);

 	if (crtc & 2)
 		nv_wr32(dev, NV_CRTC1_INTSTAT, NV_CRTC_INTR_VBLANK);
 }

 irqreturn_t
 nouveau_irq_handler(DRM_IRQ_ARGS)
 {
 	struct drm_device *dev = (struct drm_device *)arg;
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	uint32_t status, fbdev_flags = 0;

 	status = nv_rd32(dev, NV03_PMC_INTR_0);
 	if (!status)
 		return IRQ_NONE;

 	if (dev_priv->fbdev_info) {
 		fbdev_flags = dev_priv->fbdev_info->flags;
 		dev_priv->fbdev_info->flags |= FBINFO_HWACCEL_DISABLED;
 	}

 	if (status & NV_PMC_INTR_0_PFIFO_PENDING) {
 		nouveau_fifo_irq_handler(dev);
 		status &= ~NV_PMC_INTR_0_PFIFO_PENDING;
 	}

 	if (status & NV_PMC_INTR_0_PGRAPH_PENDING) {
 		if (dev_priv->card_type >= NV_50)
 			nv50_pgraph_irq_handler(dev);
 		else
 			nouveau_pgraph_irq_handler(dev);

 		status &= ~NV_PMC_INTR_0_PGRAPH_PENDING;
 	}

 	if (status & NV_PMC_INTR_0_CRTCn_PENDING) {
 		nouveau_crtc_irq_handler(dev, (status>>24)&3);
 		status &= ~NV_PMC_INTR_0_CRTCn_PENDING;
 	}

 	if (status & (NV_PMC_INTR_0_NV50_DISPLAY_PENDING |
 		      NV_PMC_INTR_0_NV50_I2C_PENDING)) {
 		nv50_display_irq_handler(dev);
 		status &= ~(NV_PMC_INTR_0_NV50_DISPLAY_PENDING |
 			    NV_PMC_INTR_0_NV50_I2C_PENDING);
 	}

 	if (status)
 		NV_ERROR(dev, "Unhandled PMC INTR status bits 0x%08x\n", status);

 	if (dev_priv->fbdev_info)
 		dev_priv->fbdev_info->flags = fbdev_flags;

 	return IRQ_HANDLED;
 }
	/*
	* Copyright (C) 2006 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.
	*
	*/

	/*
	* Authors:
	* Ben Skeggs <darktama@iinet.net.au>
	*/

	#include "drmP.h"
	#include "drm.h"
	#include "nouveau_drm.h"
	#include "nouveau_drv.h"
	#include "nouveau_reg.h"
	#include <linux/ratelimit.h>

	/* needed for hotplug irq */
	#include "nouveau_connector.h"
	#include "nv50_display.h"

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

	/* Master disable */
	nv_wr32(dev, NV03_PMC_INTR_EN_0, 0);

	if (dev_priv->card_type == NV_50) {
	INIT_WORK(&dev_priv->irq_work, nv50_display_irq_handler_bh);
	INIT_LIST_HEAD(&dev_priv->vbl_waiting);
	}
	}

	int
	nouveau_irq_postinstall(struct drm_device *dev)
	{
	/* Master enable */
	nv_wr32(dev, NV03_PMC_INTR_EN_0, NV_PMC_INTR_EN_0_MASTER_ENABLE);
	return 0;
	}

	void
	nouveau_irq_uninstall(struct drm_device *dev)
	{
	/* Master disable */
	nv_wr32(dev, NV03_PMC_INTR_EN_0, 0);
	}

	static int
	nouveau_call_method(struct nouveau_channel *chan, int class, int mthd, int data)
	{
	struct drm_nouveau_private *dev_priv = chan->dev->dev_private;
	struct nouveau_pgraph_object_method *grm;
	struct nouveau_pgraph_object_class *grc;

	grc = dev_priv->engine.graph.grclass;
	while (grc->id) {
	if (grc->id == class)
	break;
	grc++;
	}

	if (grc->id != class \|\| !grc->methods)
	return -ENOENT;

	grm = grc->methods;
	while (grm->id) {
	if (grm->id == mthd)
	return grm->exec(chan, class, mthd, data);
	grm++;
	}

	return -ENOENT;
	}

	static bool
	nouveau_fifo_swmthd(struct nouveau_channel *chan, uint32_t addr, uint32_t data)
	{
	struct drm_device *dev = chan->dev;
	const int subc = (addr >> 13) & 0x7;
	const int mthd = addr & 0x1ffc;

	if (mthd == 0x0000) {
	struct nouveau_gpuobj_ref *ref = NULL;

	if (nouveau_gpuobj_ref_find(chan, data, &ref))
	return false;

	if (ref->gpuobj->engine != NVOBJ_ENGINE_SW)
	return false;

	chan->sw_subchannel[subc] = ref->gpuobj->class;
	nv_wr32(dev, NV04_PFIFO_CACHE1_ENGINE, nv_rd32(dev,
	NV04_PFIFO_CACHE1_ENGINE) & ~(0xf << subc * 4));
	return true;
	}

	/* hw object */
	if (nv_rd32(dev, NV04_PFIFO_CACHE1_ENGINE) & (1 << (subc*4)))
	return false;

	if (nouveau_call_method(chan, chan->sw_subchannel[subc], mthd, data))
	return false;

	return true;
	}

	static void
	nouveau_fifo_irq_handler(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)) {
	struct nouveau_channel *chan = NULL;
	uint32_t chid, get;

	nv_wr32(dev, NV03_PFIFO_CACHES, 0);

	chid = engine->fifo.channel_id(dev);
	if (chid >= 0 && chid < engine->fifo.channels)
	chan = dev_priv->fifos[chid];
	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 (!chan \|\| !nouveau_fifo_swmthd(chan, 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) {
	NV_INFO(dev, "PFIFO_DMA_PUSHER - Ch %d\n", chid);

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

	nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_STATE, 0x00000000);
	if (nv_rd32(dev, NV04_PFIFO_CACHE1_DMA_PUT) != get)
	nv_wr32(dev, NV04_PFIFO_CACHE1_DMA_GET,
	get + 4);
	}

	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 (status) {
	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);
	}

	struct nouveau_bitfield_names {
	uint32_t mask;
	const char *name;
	};

	static struct nouveau_bitfield_names nstatus_names[] =
	{
	{ NV04_PGRAPH_NSTATUS_STATE_IN_USE, "STATE_IN_USE" },
	{ NV04_PGRAPH_NSTATUS_INVALID_STATE, "INVALID_STATE" },
	{ NV04_PGRAPH_NSTATUS_BAD_ARGUMENT, "BAD_ARGUMENT" },
	{ NV04_PGRAPH_NSTATUS_PROTECTION_FAULT, "PROTECTION_FAULT" }
	};

	static struct nouveau_bitfield_names nstatus_names_nv10[] =
	{
	{ NV10_PGRAPH_NSTATUS_STATE_IN_USE, "STATE_IN_USE" },
	{ NV10_PGRAPH_NSTATUS_INVALID_STATE, "INVALID_STATE" },
	{ NV10_PGRAPH_NSTATUS_BAD_ARGUMENT, "BAD_ARGUMENT" },
	{ NV10_PGRAPH_NSTATUS_PROTECTION_FAULT, "PROTECTION_FAULT" }
	};

	static struct nouveau_bitfield_names nsource_names[] =
	{
	{ NV03_PGRAPH_NSOURCE_NOTIFICATION, "NOTIFICATION" },
	{ NV03_PGRAPH_NSOURCE_DATA_ERROR, "DATA_ERROR" },
	{ NV03_PGRAPH_NSOURCE_PROTECTION_ERROR, "PROTECTION_ERROR" },
	{ NV03_PGRAPH_NSOURCE_RANGE_EXCEPTION, "RANGE_EXCEPTION" },
	{ NV03_PGRAPH_NSOURCE_LIMIT_COLOR, "LIMIT_COLOR" },
	{ NV03_PGRAPH_NSOURCE_LIMIT_ZETA, "LIMIT_ZETA" },
	{ NV03_PGRAPH_NSOURCE_ILLEGAL_MTHD, "ILLEGAL_MTHD" },
	{ NV03_PGRAPH_NSOURCE_DMA_R_PROTECTION, "DMA_R_PROTECTION" },
	{ NV03_PGRAPH_NSOURCE_DMA_W_PROTECTION, "DMA_W_PROTECTION" },
	{ NV03_PGRAPH_NSOURCE_FORMAT_EXCEPTION, "FORMAT_EXCEPTION" },
	{ NV03_PGRAPH_NSOURCE_PATCH_EXCEPTION, "PATCH_EXCEPTION" },
	{ NV03_PGRAPH_NSOURCE_STATE_INVALID, "STATE_INVALID" },
	{ NV03_PGRAPH_NSOURCE_DOUBLE_NOTIFY, "DOUBLE_NOTIFY" },
	{ NV03_PGRAPH_NSOURCE_NOTIFY_IN_USE, "NOTIFY_IN_USE" },
	{ NV03_PGRAPH_NSOURCE_METHOD_CNT, "METHOD_CNT" },
	{ NV03_PGRAPH_NSOURCE_BFR_NOTIFICATION, "BFR_NOTIFICATION" },
	{ NV03_PGRAPH_NSOURCE_DMA_VTX_PROTECTION, "DMA_VTX_PROTECTION" },
	{ NV03_PGRAPH_NSOURCE_DMA_WIDTH_A, "DMA_WIDTH_A" },
	{ NV03_PGRAPH_NSOURCE_DMA_WIDTH_B, "DMA_WIDTH_B" },
	};

	static void
	nouveau_print_bitfield_names_(uint32_t value,
	const struct nouveau_bitfield_names *namelist,
	const int namelist_len)
	{
	/*
	* Caller must have already printed the KERN_* log level for us.
	* Also the caller is responsible for adding the newline.
	*/
	int i;
	for (i = 0; i < namelist_len; ++i) {
	uint32_t mask = namelist[i].mask;
	if (value & mask) {
	printk(" %s", namelist[i].name);
	value &= ~mask;
	}
	}
	if (value)
	printk(" (unknown bits 0x%08x)", value);
	}
	#define nouveau_print_bitfield_names(val, namelist) \
	nouveau_print_bitfield_names_((val), (namelist), ARRAY_SIZE(namelist))


	static int
	nouveau_graph_chid_from_grctx(struct drm_device *dev)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	uint32_t inst;
	int i;

	if (dev_priv->card_type < NV_40)
	return dev_priv->engine.fifo.channels;
	else
	if (dev_priv->card_type < NV_50) {
	inst = (nv_rd32(dev, 0x40032c) & 0xfffff) << 4;

	for (i = 0; i < dev_priv->engine.fifo.channels; i++) {
	struct nouveau_channel *chan = dev_priv->fifos[i];

	if (!chan \|\| !chan->ramin_grctx)
	continue;

	if (inst == chan->ramin_grctx->instance)
	break;
	}
	} else {
	inst = (nv_rd32(dev, 0x40032c) & 0xfffff) << 12;

	for (i = 0; i < dev_priv->engine.fifo.channels; i++) {
	struct nouveau_channel *chan = dev_priv->fifos[i];

	if (!chan \|\| !chan->ramin)
	continue;

	if (inst == chan->ramin->instance)
	break;
	}
	}


	return i;
	}

	static int
	nouveau_graph_trapped_channel(struct drm_device dev, int channel_ret)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_engine *engine = &dev_priv->engine;
	int channel;

	if (dev_priv->card_type < NV_10)
	channel = (nv_rd32(dev, NV04_PGRAPH_TRAPPED_ADDR) >> 24) & 0xf;
	else
	if (dev_priv->card_type < NV_40)
	channel = (nv_rd32(dev, NV04_PGRAPH_TRAPPED_ADDR) >> 20) & 0x1f;
	else
	channel = nouveau_graph_chid_from_grctx(dev);

	if (channel >= engine->fifo.channels \|\| !dev_priv->fifos[channel]) {
	NV_ERROR(dev, "AIII, invalid/inactive channel id %d\n", channel);
	return -EINVAL;
	}

	*channel_ret = channel;
	return 0;
	}

	struct nouveau_pgraph_trap {
	int channel;
	int class;
	int subc, mthd, size;
	uint32_t data, data2;
	uint32_t nsource, nstatus;
	};

	static void
	nouveau_graph_trap_info(struct drm_device *dev,
	struct nouveau_pgraph_trap *trap)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	uint32_t address;

	trap->nsource = trap->nstatus = 0;
	if (dev_priv->card_type < NV_50) {
	trap->nsource = nv_rd32(dev, NV03_PGRAPH_NSOURCE);
	trap->nstatus = nv_rd32(dev, NV03_PGRAPH_NSTATUS);
	}

	if (nouveau_graph_trapped_channel(dev, &trap->channel))
	trap->channel = -1;
	address = nv_rd32(dev, NV04_PGRAPH_TRAPPED_ADDR);

	trap->mthd = address & 0x1FFC;
	trap->data = nv_rd32(dev, NV04_PGRAPH_TRAPPED_DATA);
	if (dev_priv->card_type < NV_10) {
	trap->subc = (address >> 13) & 0x7;
	} else {
	trap->subc = (address >> 16) & 0x7;
	trap->data2 = nv_rd32(dev, NV10_PGRAPH_TRAPPED_DATA_HIGH);
	}

	if (dev_priv->card_type < NV_10)
	trap->class = nv_rd32(dev, 0x400180 + trap->subc*4) & 0xFF;
	else if (dev_priv->card_type < NV_40)
	trap->class = nv_rd32(dev, 0x400160 + trap->subc*4) & 0xFFF;
	else if (dev_priv->card_type < NV_50)
	trap->class = nv_rd32(dev, 0x400160 + trap->subc*4) & 0xFFFF;
	else
	trap->class = nv_rd32(dev, 0x400814);
	}

	static void
	nouveau_graph_dump_trap_info(struct drm_device dev, const char id,
	struct nouveau_pgraph_trap *trap)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	uint32_t nsource = trap->nsource, nstatus = trap->nstatus;

	NV_INFO(dev, "%s - nSource:", id);
	nouveau_print_bitfield_names(nsource, nsource_names);
	printk(", nStatus:");
	if (dev_priv->card_type < NV_10)
	nouveau_print_bitfield_names(nstatus, nstatus_names);
	else
	nouveau_print_bitfield_names(nstatus, nstatus_names_nv10);
	printk("\n");

	NV_INFO(dev, "%s - Ch %d/%d Class 0x%04x Mthd 0x%04x "
	"Data 0x%08x:0x%08x\n",
	id, trap->channel, trap->subc,
	trap->class, trap->mthd,
	trap->data2, trap->data);
	}

	static int
	nouveau_pgraph_intr_swmthd(struct drm_device *dev,
	struct nouveau_pgraph_trap *trap)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;

	if (trap->channel < 0 \|\|
	trap->channel >= dev_priv->engine.fifo.channels \|\|
	!dev_priv->fifos[trap->channel])
	return -ENODEV;

	return nouveau_call_method(dev_priv->fifos[trap->channel],
	trap->class, trap->mthd, trap->data);
	}

	static inline void
	nouveau_pgraph_intr_notify(struct drm_device *dev, uint32_t nsource)
	{
	struct nouveau_pgraph_trap trap;
	int unhandled = 0;

	nouveau_graph_trap_info(dev, &trap);

	if (nsource & NV03_PGRAPH_NSOURCE_ILLEGAL_MTHD) {
	if (nouveau_pgraph_intr_swmthd(dev, &trap))
	unhandled = 1;
	} else {
	unhandled = 1;
	}

	if (unhandled)
	nouveau_graph_dump_trap_info(dev, "PGRAPH_NOTIFY", &trap);
	}

	static DEFINE_RATELIMIT_STATE(nouveau_ratelimit_state, 3 * HZ, 20);

	static int nouveau_ratelimit(void)
	{
	return __ratelimit(&nouveau_ratelimit_state);
	}


	static inline void
	nouveau_pgraph_intr_error(struct drm_device *dev, uint32_t nsource)
	{
	struct nouveau_pgraph_trap trap;
	int unhandled = 0;

	nouveau_graph_trap_info(dev, &trap);
	trap.nsource = nsource;

	if (nsource & NV03_PGRAPH_NSOURCE_ILLEGAL_MTHD) {
	if (nouveau_pgraph_intr_swmthd(dev, &trap))
	unhandled = 1;
	} else if (nsource & NV03_PGRAPH_NSOURCE_DMA_VTX_PROTECTION) {
	uint32_t v = nv_rd32(dev, 0x402000);
	nv_wr32(dev, 0x402000, v);

	/* dump the error anyway for now: it's useful for
	Gallium development */
	unhandled = 1;
	} else {
	unhandled = 1;
	}

	if (unhandled && nouveau_ratelimit())
	nouveau_graph_dump_trap_info(dev, "PGRAPH_ERROR", &trap);
	}

	static inline void
	nouveau_pgraph_intr_context_switch(struct drm_device *dev)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_engine *engine = &dev_priv->engine;
	uint32_t chid;

	chid = engine->fifo.channel_id(dev);
	NV_DEBUG(dev, "PGRAPH context switch interrupt channel %x\n", chid);

	switch (dev_priv->card_type) {
	case NV_04:
	nv04_graph_context_switch(dev);
	break;
	case NV_10:
	nv10_graph_context_switch(dev);
	break;
	default:
	NV_ERROR(dev, "Context switch not implemented\n");
	break;
	}
	}

	static void
	nouveau_pgraph_irq_handler(struct drm_device *dev)
	{
	uint32_t status;

	while ((status = nv_rd32(dev, NV03_PGRAPH_INTR))) {
	uint32_t nsource = nv_rd32(dev, NV03_PGRAPH_NSOURCE);

	if (status & NV_PGRAPH_INTR_NOTIFY) {
	nouveau_pgraph_intr_notify(dev, nsource);

	status &= ~NV_PGRAPH_INTR_NOTIFY;
	nv_wr32(dev, NV03_PGRAPH_INTR, NV_PGRAPH_INTR_NOTIFY);
	}

	if (status & NV_PGRAPH_INTR_ERROR) {
	nouveau_pgraph_intr_error(dev, nsource);

	status &= ~NV_PGRAPH_INTR_ERROR;
	nv_wr32(dev, NV03_PGRAPH_INTR, NV_PGRAPH_INTR_ERROR);
	}

	if (status & NV_PGRAPH_INTR_CONTEXT_SWITCH) {
	nouveau_pgraph_intr_context_switch(dev);

	status &= ~NV_PGRAPH_INTR_CONTEXT_SWITCH;
	nv_wr32(dev, NV03_PGRAPH_INTR,
	NV_PGRAPH_INTR_CONTEXT_SWITCH);
	}

	if (status) {
	NV_INFO(dev, "Unhandled PGRAPH_INTR - 0x%08x\n", status);
	nv_wr32(dev, NV03_PGRAPH_INTR, status);
	}

	if ((nv_rd32(dev, NV04_PGRAPH_FIFO) & (1 << 0)) == 0)
	nv_wr32(dev, NV04_PGRAPH_FIFO, 1);
	}

	nv_wr32(dev, NV03_PMC_INTR_0, NV_PMC_INTR_0_PGRAPH_PENDING);
	}

	static void
	nv50_pgraph_irq_handler(struct drm_device *dev)
	{
	uint32_t status;

	while ((status = nv_rd32(dev, NV03_PGRAPH_INTR))) {
	uint32_t nsource = nv_rd32(dev, NV03_PGRAPH_NSOURCE);

	if (status & 0x00000001) {
	nouveau_pgraph_intr_notify(dev, nsource);
	status &= ~0x00000001;
	nv_wr32(dev, NV03_PGRAPH_INTR, 0x00000001);
	}

	if (status & 0x00000010) {
	nouveau_pgraph_intr_error(dev, nsource \|
	NV03_PGRAPH_NSOURCE_ILLEGAL_MTHD);

	status &= ~0x00000010;
	nv_wr32(dev, NV03_PGRAPH_INTR, 0x00000010);
	}

	if (status & 0x00001000) {
	nv_wr32(dev, 0x400500, 0x00000000);
	nv_wr32(dev, NV03_PGRAPH_INTR,
	NV_PGRAPH_INTR_CONTEXT_SWITCH);
	nv_wr32(dev, NV40_PGRAPH_INTR_EN, nv_rd32(dev,
	NV40_PGRAPH_INTR_EN) &
	~NV_PGRAPH_INTR_CONTEXT_SWITCH);
	nv_wr32(dev, 0x400500, 0x00010001);

	nv50_graph_context_switch(dev);

	status &= ~NV_PGRAPH_INTR_CONTEXT_SWITCH;
	}

	if (status & 0x00100000) {
	nouveau_pgraph_intr_error(dev, nsource \|
	NV03_PGRAPH_NSOURCE_DATA_ERROR);

	status &= ~0x00100000;
	nv_wr32(dev, NV03_PGRAPH_INTR, 0x00100000);
	}

	if (status & 0x00200000) {
	int r;

	nouveau_pgraph_intr_error(dev, nsource \|
	NV03_PGRAPH_NSOURCE_PROTECTION_ERROR);

	NV_ERROR(dev, "magic set 1:\n");
	for (r = 0x408900; r <= 0x408910; r += 4)
	NV_ERROR(dev, "\t0x%08x: 0x%08x\n", r,
	nv_rd32(dev, r));
	nv_wr32(dev, 0x408900,
	nv_rd32(dev, 0x408904) \| 0xc0000000);
	for (r = 0x408e08; r <= 0x408e24; r += 4)
	NV_ERROR(dev, "\t0x%08x: 0x%08x\n", r,
	nv_rd32(dev, r));
	nv_wr32(dev, 0x408e08,
	nv_rd32(dev, 0x408e08) \| 0xc0000000);

	NV_ERROR(dev, "magic set 2:\n");
	for (r = 0x409900; r <= 0x409910; r += 4)
	NV_ERROR(dev, "\t0x%08x: 0x%08x\n", r,
	nv_rd32(dev, r));
	nv_wr32(dev, 0x409900,
	nv_rd32(dev, 0x409904) \| 0xc0000000);
	for (r = 0x409e08; r <= 0x409e24; r += 4)
	NV_ERROR(dev, "\t0x%08x: 0x%08x\n", r,
	nv_rd32(dev, r));
	nv_wr32(dev, 0x409e08,
	nv_rd32(dev, 0x409e08) \| 0xc0000000);

	status &= ~0x00200000;
	nv_wr32(dev, NV03_PGRAPH_NSOURCE, nsource);
	nv_wr32(dev, NV03_PGRAPH_INTR, 0x00200000);
	}

	if (status) {
	NV_INFO(dev, "Unhandled PGRAPH_INTR - 0x%08x\n",
	status);
	nv_wr32(dev, NV03_PGRAPH_INTR, status);
	}

	{
	const int isb = (1 << 16) \| (1 << 0);

	if ((nv_rd32(dev, 0x400500) & isb) != isb)
	nv_wr32(dev, 0x400500,
	nv_rd32(dev, 0x400500) \| isb);
	}
	}

	nv_wr32(dev, NV03_PMC_INTR_0, NV_PMC_INTR_0_PGRAPH_PENDING);
	nv_wr32(dev, 0x400824, nv_rd32(dev, 0x400824) & ~(1 << 31));
	}

	static void
	nouveau_crtc_irq_handler(struct drm_device *dev, int crtc)
	{
	if (crtc & 1)
	nv_wr32(dev, NV_CRTC0_INTSTAT, NV_CRTC_INTR_VBLANK);

	if (crtc & 2)
	nv_wr32(dev, NV_CRTC1_INTSTAT, NV_CRTC_INTR_VBLANK);
	}

	irqreturn_t
	nouveau_irq_handler(DRM_IRQ_ARGS)
	{
	struct drm_device dev = (struct drm_device )arg;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	uint32_t status, fbdev_flags = 0;

	status = nv_rd32(dev, NV03_PMC_INTR_0);
	if (!status)
	return IRQ_NONE;

	if (dev_priv->fbdev_info) {
	fbdev_flags = dev_priv->fbdev_info->flags;
	dev_priv->fbdev_info->flags \|= FBINFO_HWACCEL_DISABLED;
	}

	if (status & NV_PMC_INTR_0_PFIFO_PENDING) {
	nouveau_fifo_irq_handler(dev);
	status &= ~NV_PMC_INTR_0_PFIFO_PENDING;
	}

	if (status & NV_PMC_INTR_0_PGRAPH_PENDING) {
	if (dev_priv->card_type >= NV_50)
	nv50_pgraph_irq_handler(dev);
	else
	nouveau_pgraph_irq_handler(dev);

	status &= ~NV_PMC_INTR_0_PGRAPH_PENDING;
	}

	if (status & NV_PMC_INTR_0_CRTCn_PENDING) {
	nouveau_crtc_irq_handler(dev, (status>>24)&3);
	status &= ~NV_PMC_INTR_0_CRTCn_PENDING;
	}

	if (status & (NV_PMC_INTR_0_NV50_DISPLAY_PENDING \|
	NV_PMC_INTR_0_NV50_I2C_PENDING)) {
	nv50_display_irq_handler(dev);
	status &= ~(NV_PMC_INTR_0_NV50_DISPLAY_PENDING \|
	NV_PMC_INTR_0_NV50_I2C_PENDING);
	}

	if (status)
	NV_ERROR(dev, "Unhandled PMC INTR status bits 0x%08x\n", status);

	if (dev_priv->fbdev_info)
	dev_priv->fbdev_info->flags = fbdev_flags;

	return IRQ_HANDLED;
	}