linux/drivers/gpu/drm/nouveau/nv50_graph.c - nest-guard/1.0/linux - Git at Google

 /*
  * 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_grctx.h"

 static void
 nv50_graph_init_reset(struct drm_device *dev)
 {
 	uint32_t pmc_e = NV_PMC_ENABLE_PGRAPH | (1 << 21);

 	NV_DEBUG(dev, "\n");

 	nv_wr32(dev, NV03_PMC_ENABLE, nv_rd32(dev, NV03_PMC_ENABLE) & ~pmc_e);
 	nv_wr32(dev, NV03_PMC_ENABLE, nv_rd32(dev, NV03_PMC_ENABLE) |  pmc_e);
 }

 static void
 nv50_graph_init_intr(struct drm_device *dev)
 {
 	NV_DEBUG(dev, "\n");

 	nv_wr32(dev, NV03_PGRAPH_INTR, 0xffffffff);
 	nv_wr32(dev, 0x400138, 0xffffffff);
 	nv_wr32(dev, NV40_PGRAPH_INTR_EN, 0xffffffff);
 }

 static void
 nv50_graph_init_regs__nv(struct drm_device *dev)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	uint32_t units = nv_rd32(dev, 0x1540);
 	int i;

 	NV_DEBUG(dev, "\n");

 	nv_wr32(dev, 0x400804, 0xc0000000);
 	nv_wr32(dev, 0x406800, 0xc0000000);
 	nv_wr32(dev, 0x400c04, 0xc0000000);
 	nv_wr32(dev, 0x401800, 0xc0000000);
 	nv_wr32(dev, 0x405018, 0xc0000000);
 	nv_wr32(dev, 0x402000, 0xc0000000);

 	for (i = 0; i < 16; i++) {
 		if (units & 1 << i) {
 			if (dev_priv->chipset < 0xa0) {
 				nv_wr32(dev, 0x408900 + (i << 12), 0xc0000000);
 				nv_wr32(dev, 0x408e08 + (i << 12), 0xc0000000);
 				nv_wr32(dev, 0x408314 + (i << 12), 0xc0000000);
 			} else {
 				nv_wr32(dev, 0x408600 + (i << 11), 0xc0000000);
 				nv_wr32(dev, 0x408708 + (i << 11), 0xc0000000);
 				nv_wr32(dev, 0x40831c + (i << 11), 0xc0000000);
 			}
 		}
 	}

 	nv_wr32(dev, 0x400108, 0xffffffff);

 	nv_wr32(dev, 0x400824, 0x00004000);
 	nv_wr32(dev, 0x400500, 0x00010001);
 }

 static void
 nv50_graph_init_regs(struct drm_device *dev)
 {
 	NV_DEBUG(dev, "\n");

 	nv_wr32(dev, NV04_PGRAPH_DEBUG_3,
 				(1 << 2) /* HW_CONTEXT_SWITCH_ENABLED */);
 	nv_wr32(dev, 0x402ca8, 0x800);
 }

 static int
 nv50_graph_init_ctxctl(struct drm_device *dev)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_grctx ctx = {};
 	uint32_t *cp;
 	int i;

 	NV_DEBUG(dev, "\n");

 	cp = kmalloc(512 * 4, GFP_KERNEL);
 	if (!cp) {
 		NV_ERROR(dev, "failed to allocate ctxprog\n");
 		dev_priv->engine.graph.accel_blocked = true;
 		return 0;
 	}

 	ctx.dev = dev;
 	ctx.mode = NOUVEAU_GRCTX_PROG;
 	ctx.data = cp;
 	ctx.ctxprog_max = 512;
 	if (!nv50_grctx_init(&ctx)) {
 		dev_priv->engine.graph.grctx_size = ctx.ctxvals_pos * 4;

 		nv_wr32(dev, NV40_PGRAPH_CTXCTL_UCODE_INDEX, 0);
 		for (i = 0; i < ctx.ctxprog_len; i++)
 			nv_wr32(dev, NV40_PGRAPH_CTXCTL_UCODE_DATA, cp[i]);
 	} else {
 		dev_priv->engine.graph.accel_blocked = true;
 	}
 	kfree(cp);

 	nv_wr32(dev, 0x400320, 4);
 	nv_wr32(dev, NV40_PGRAPH_CTXCTL_CUR, 0);
 	nv_wr32(dev, NV20_PGRAPH_CHANNEL_CTX_POINTER, 0);
 	return 0;
 }

 int
 nv50_graph_init(struct drm_device *dev)
 {
 	int ret;

 	NV_DEBUG(dev, "\n");

 	nv50_graph_init_reset(dev);
 	nv50_graph_init_regs__nv(dev);
 	nv50_graph_init_regs(dev);
 	nv50_graph_init_intr(dev);

 	ret = nv50_graph_init_ctxctl(dev);
 	if (ret)
 		return ret;

 	return 0;
 }

 void
 nv50_graph_takedown(struct drm_device *dev)
 {
 	NV_DEBUG(dev, "\n");
 }

 void
 nv50_graph_fifo_access(struct drm_device *dev, bool enabled)
 {
 	const uint32_t mask = 0x00010001;

 	if (enabled)
 		nv_wr32(dev, 0x400500, nv_rd32(dev, 0x400500) | mask);
 	else
 		nv_wr32(dev, 0x400500, nv_rd32(dev, 0x400500) & ~mask);
 }

 struct nouveau_channel *
 nv50_graph_channel(struct drm_device *dev)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	uint32_t inst;
 	int i;

 	/* Be sure we're not in the middle of a context switch or bad things
 	 * will happen, such as unloading the wrong pgraph context.
 	 */
 	if (!nv_wait(dev, 0x400300, 0x00000001, 0x00000000))
 		NV_ERROR(dev, "Ctxprog is still running\n");

 	inst = nv_rd32(dev, NV50_PGRAPH_CTXCTL_CUR);
 	if (!(inst & NV50_PGRAPH_CTXCTL_CUR_LOADED))
 		return NULL;
 	inst = (inst & NV50_PGRAPH_CTXCTL_CUR_INSTANCE) << 12;

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

 		if (chan && chan->ramin && chan->ramin->vinst == inst)
 			return chan;
 	}

 	return NULL;
 }

 int
 nv50_graph_create_context(struct nouveau_channel *chan)
 {
 	struct drm_device *dev = chan->dev;
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_gpuobj *ramin = chan->ramin;
 	struct nouveau_pgraph_engine *pgraph = &dev_priv->engine.graph;
 	struct nouveau_grctx ctx = {};
 	int hdr, ret;

 	NV_DEBUG(dev, "ch%d\n", chan->id);

 	ret = nouveau_gpuobj_new(dev, chan, pgraph->grctx_size, 0x1000,
 				 NVOBJ_FLAG_ZERO_ALLOC |
 				 NVOBJ_FLAG_ZERO_FREE, &chan->ramin_grctx);
 	if (ret)
 		return ret;

 	hdr = (dev_priv->chipset == 0x50) ? 0x200 : 0x20;
 	nv_wo32(ramin, hdr + 0x00, 0x00190002);
 	nv_wo32(ramin, hdr + 0x04, chan->ramin_grctx->vinst +
 				   pgraph->grctx_size - 1);
 	nv_wo32(ramin, hdr + 0x08, chan->ramin_grctx->vinst);
 	nv_wo32(ramin, hdr + 0x0c, 0);
 	nv_wo32(ramin, hdr + 0x10, 0);
 	nv_wo32(ramin, hdr + 0x14, 0x00010000);

 	ctx.dev = chan->dev;
 	ctx.mode = NOUVEAU_GRCTX_VALS;
 	ctx.data = chan->ramin_grctx;
 	nv50_grctx_init(&ctx);

 	nv_wo32(chan->ramin_grctx, 0x00000, chan->ramin->vinst >> 12);

 	dev_priv->engine.instmem.flush(dev);
 	return 0;
 }

 void
 nv50_graph_destroy_context(struct nouveau_channel *chan)
 {
 	struct drm_device *dev = chan->dev;
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	int i, hdr = (dev_priv->chipset == 0x50) ? 0x200 : 0x20;

 	NV_DEBUG(dev, "ch%d\n", chan->id);

 	if (!chan->ramin)
 		return;

 	for (i = hdr; i < hdr + 24; i += 4)
 		nv_wo32(chan->ramin, i, 0);
 	dev_priv->engine.instmem.flush(dev);

 	nouveau_gpuobj_ref(NULL, &chan->ramin_grctx);
 }

 static int
 nv50_graph_do_load_context(struct drm_device *dev, uint32_t inst)
 {
 	uint32_t fifo = nv_rd32(dev, 0x400500);

 	nv_wr32(dev, 0x400500, fifo & ~1);
 	nv_wr32(dev, 0x400784, inst);
 	nv_wr32(dev, 0x400824, nv_rd32(dev, 0x400824) | 0x40);
 	nv_wr32(dev, 0x400320, nv_rd32(dev, 0x400320) | 0x11);
 	nv_wr32(dev, 0x400040, 0xffffffff);
 	(void)nv_rd32(dev, 0x400040);
 	nv_wr32(dev, 0x400040, 0x00000000);
 	nv_wr32(dev, 0x400304, nv_rd32(dev, 0x400304) | 1);

 	if (nouveau_wait_for_idle(dev))
 		nv_wr32(dev, 0x40032c, inst | (1<<31));
 	nv_wr32(dev, 0x400500, fifo);

 	return 0;
 }

 int
 nv50_graph_load_context(struct nouveau_channel *chan)
 {
 	uint32_t inst = chan->ramin->vinst >> 12;

 	NV_DEBUG(chan->dev, "ch%d\n", chan->id);
 	return nv50_graph_do_load_context(chan->dev, inst);
 }

 int
 nv50_graph_unload_context(struct drm_device *dev)
 {
 	uint32_t inst;

 	inst  = nv_rd32(dev, NV50_PGRAPH_CTXCTL_CUR);
 	if (!(inst & NV50_PGRAPH_CTXCTL_CUR_LOADED))
 		return 0;
 	inst &= NV50_PGRAPH_CTXCTL_CUR_INSTANCE;

 	nouveau_wait_for_idle(dev);
 	nv_wr32(dev, 0x400784, inst);
 	nv_wr32(dev, 0x400824, nv_rd32(dev, 0x400824) | 0x20);
 	nv_wr32(dev, 0x400304, nv_rd32(dev, 0x400304) | 0x01);
 	nouveau_wait_for_idle(dev);

 	nv_wr32(dev, NV50_PGRAPH_CTXCTL_CUR, inst);
 	return 0;
 }

 void
 nv50_graph_context_switch(struct drm_device *dev)
 {
 	uint32_t inst;

 	nv50_graph_unload_context(dev);

 	inst  = nv_rd32(dev, NV50_PGRAPH_CTXCTL_NEXT);
 	inst &= NV50_PGRAPH_CTXCTL_NEXT_INSTANCE;
 	nv50_graph_do_load_context(dev, inst);

 	nv_wr32(dev, NV40_PGRAPH_INTR_EN, nv_rd32(dev,
 		NV40_PGRAPH_INTR_EN) | NV_PGRAPH_INTR_CONTEXT_SWITCH);
 }

 static int
 nv50_graph_nvsw_dma_vblsem(struct nouveau_channel *chan, int grclass,
 			   int mthd, uint32_t data)
 {
 	struct nouveau_gpuobj *gpuobj;

 	gpuobj = nouveau_ramht_find(chan, data);
 	if (!gpuobj)
 		return -ENOENT;

 	if (nouveau_notifier_offset(gpuobj, NULL))
 		return -EINVAL;

 	chan->nvsw.vblsem = gpuobj;
 	chan->nvsw.vblsem_offset = ~0;
 	return 0;
 }

 static int
 nv50_graph_nvsw_vblsem_offset(struct nouveau_channel *chan, int grclass,
 			      int mthd, uint32_t data)
 {
 	if (nouveau_notifier_offset(chan->nvsw.vblsem, &data))
 		return -ERANGE;

 	chan->nvsw.vblsem_offset = data >> 2;
 	return 0;
 }

 static int
 nv50_graph_nvsw_vblsem_release_val(struct nouveau_channel *chan, int grclass,
 				   int mthd, uint32_t data)
 {
 	chan->nvsw.vblsem_rval = data;
 	return 0;
 }

 static int
 nv50_graph_nvsw_vblsem_release(struct nouveau_channel *chan, int grclass,
 			       int mthd, uint32_t data)
 {
 	struct drm_device *dev = chan->dev;
 	struct drm_nouveau_private *dev_priv = dev->dev_private;

 	if (!chan->nvsw.vblsem || chan->nvsw.vblsem_offset == ~0 || data > 1)
 		return -EINVAL;

 	if (!(nv_rd32(dev, NV50_PDISPLAY_INTR_EN) &
 		      NV50_PDISPLAY_INTR_EN_VBLANK_CRTC_(data))) {
 		nv_wr32(dev, NV50_PDISPLAY_INTR_1,
 			NV50_PDISPLAY_INTR_1_VBLANK_CRTC_(data));
 		nv_wr32(dev, NV50_PDISPLAY_INTR_EN, nv_rd32(dev,
 			NV50_PDISPLAY_INTR_EN) |
 			NV50_PDISPLAY_INTR_EN_VBLANK_CRTC_(data));
 	}

 	list_add(&chan->nvsw.vbl_wait, &dev_priv->vbl_waiting);
 	return 0;
 }

 static struct nouveau_pgraph_object_method nv50_graph_nvsw_methods[] = {
 	{ 0x018c, nv50_graph_nvsw_dma_vblsem },
 	{ 0x0400, nv50_graph_nvsw_vblsem_offset },
 	{ 0x0404, nv50_graph_nvsw_vblsem_release_val },
 	{ 0x0408, nv50_graph_nvsw_vblsem_release },
 	{}
 };

 struct nouveau_pgraph_object_class nv50_graph_grclass[] = {
 	{ 0x506e, true, nv50_graph_nvsw_methods }, /* nvsw */
 	{ 0x0030, false, NULL }, /* null */
 	{ 0x5039, false, NULL }, /* m2mf */
 	{ 0x502d, false, NULL }, /* 2d */
 	{ 0x50c0, false, NULL }, /* compute */
 	{ 0x85c0, false, NULL }, /* compute (nva3, nva5, nva8) */
 	{ 0x5097, false, NULL }, /* tesla (nv50) */
 	{ 0x8297, false, NULL }, /* tesla (nv8x/nv9x) */
 	{ 0x8397, false, NULL }, /* tesla (nva0, nvaa, nvac) */
 	{ 0x8597, false, NULL }, /* tesla (nva3, nva5, nva8) */
 	{}
 };

 void
 nv50_graph_tlb_flush(struct drm_device *dev)
 {
 	nv50_vm_flush(dev, 0);
 }

 void
 nv86_graph_tlb_flush(struct drm_device *dev)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_timer_engine *ptimer = &dev_priv->engine.timer;
 	bool idle, timeout = false;
 	unsigned long flags;
 	u64 start;
 	u32 tmp;

 	spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
 	nv_mask(dev, 0x400500, 0x00000001, 0x00000000);

 	start = ptimer->read(dev);
 	do {
 		idle = true;

 		for (tmp = nv_rd32(dev, 0x400380); tmp && idle; tmp >>= 3) {
 			if ((tmp & 7) == 1)
 				idle = false;
 		}

 		for (tmp = nv_rd32(dev, 0x400384); tmp && idle; tmp >>= 3) {
 			if ((tmp & 7) == 1)
 				idle = false;
 		}

 		for (tmp = nv_rd32(dev, 0x400388); tmp && idle; tmp >>= 3) {
 			if ((tmp & 7) == 1)
 				idle = false;
 		}
 	} while (!idle && !(timeout = ptimer->read(dev) - start > 2000000000));

 	if (timeout) {
 		NV_ERROR(dev, "PGRAPH TLB flush idle timeout fail: "
 			      "0x%08x 0x%08x 0x%08x 0x%08x\n",
 			 nv_rd32(dev, 0x400700), nv_rd32(dev, 0x400380),
 			 nv_rd32(dev, 0x400384), nv_rd32(dev, 0x400388));
 	}

 	nv50_vm_flush(dev, 0);

 	nv_mask(dev, 0x400500, 0x00000001, 0x00000001);
 	spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
 }
	/*
	* 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_grctx.h"

	static void
	nv50_graph_init_reset(struct drm_device *dev)
	{
	uint32_t pmc_e = NV_PMC_ENABLE_PGRAPH \| (1 << 21);

	NV_DEBUG(dev, "\n");

	nv_wr32(dev, NV03_PMC_ENABLE, nv_rd32(dev, NV03_PMC_ENABLE) & ~pmc_e);
	nv_wr32(dev, NV03_PMC_ENABLE, nv_rd32(dev, NV03_PMC_ENABLE) \| pmc_e);
	}

	static void
	nv50_graph_init_intr(struct drm_device *dev)
	{
	NV_DEBUG(dev, "\n");

	nv_wr32(dev, NV03_PGRAPH_INTR, 0xffffffff);
	nv_wr32(dev, 0x400138, 0xffffffff);
	nv_wr32(dev, NV40_PGRAPH_INTR_EN, 0xffffffff);
	}

	static void
	nv50_graph_init_regs__nv(struct drm_device *dev)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	uint32_t units = nv_rd32(dev, 0x1540);
	int i;

	NV_DEBUG(dev, "\n");

	nv_wr32(dev, 0x400804, 0xc0000000);
	nv_wr32(dev, 0x406800, 0xc0000000);
	nv_wr32(dev, 0x400c04, 0xc0000000);
	nv_wr32(dev, 0x401800, 0xc0000000);
	nv_wr32(dev, 0x405018, 0xc0000000);
	nv_wr32(dev, 0x402000, 0xc0000000);

	for (i = 0; i < 16; i++) {
	if (units & 1 << i) {
	if (dev_priv->chipset < 0xa0) {
	nv_wr32(dev, 0x408900 + (i << 12), 0xc0000000);
	nv_wr32(dev, 0x408e08 + (i << 12), 0xc0000000);
	nv_wr32(dev, 0x408314 + (i << 12), 0xc0000000);
	} else {
	nv_wr32(dev, 0x408600 + (i << 11), 0xc0000000);
	nv_wr32(dev, 0x408708 + (i << 11), 0xc0000000);
	nv_wr32(dev, 0x40831c + (i << 11), 0xc0000000);
	}
	}
	}

	nv_wr32(dev, 0x400108, 0xffffffff);

	nv_wr32(dev, 0x400824, 0x00004000);
	nv_wr32(dev, 0x400500, 0x00010001);
	}

	static void
	nv50_graph_init_regs(struct drm_device *dev)
	{
	NV_DEBUG(dev, "\n");

	nv_wr32(dev, NV04_PGRAPH_DEBUG_3,
	(1 << 2) /* HW_CONTEXT_SWITCH_ENABLED */);
	nv_wr32(dev, 0x402ca8, 0x800);
	}

	static int
	nv50_graph_init_ctxctl(struct drm_device *dev)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_grctx ctx = {};
	uint32_t *cp;
	int i;

	NV_DEBUG(dev, "\n");

	cp = kmalloc(512 * 4, GFP_KERNEL);
	if (!cp) {
	NV_ERROR(dev, "failed to allocate ctxprog\n");
	dev_priv->engine.graph.accel_blocked = true;
	return 0;
	}

	ctx.dev = dev;
	ctx.mode = NOUVEAU_GRCTX_PROG;
	ctx.data = cp;
	ctx.ctxprog_max = 512;
	if (!nv50_grctx_init(&ctx)) {
	dev_priv->engine.graph.grctx_size = ctx.ctxvals_pos * 4;

	nv_wr32(dev, NV40_PGRAPH_CTXCTL_UCODE_INDEX, 0);
	for (i = 0; i < ctx.ctxprog_len; i++)
	nv_wr32(dev, NV40_PGRAPH_CTXCTL_UCODE_DATA, cp[i]);
	} else {
	dev_priv->engine.graph.accel_blocked = true;
	}
	kfree(cp);

	nv_wr32(dev, 0x400320, 4);
	nv_wr32(dev, NV40_PGRAPH_CTXCTL_CUR, 0);
	nv_wr32(dev, NV20_PGRAPH_CHANNEL_CTX_POINTER, 0);
	return 0;
	}

	int
	nv50_graph_init(struct drm_device *dev)
	{
	int ret;

	NV_DEBUG(dev, "\n");

	nv50_graph_init_reset(dev);
	nv50_graph_init_regs__nv(dev);
	nv50_graph_init_regs(dev);
	nv50_graph_init_intr(dev);

	ret = nv50_graph_init_ctxctl(dev);
	if (ret)
	return ret;

	return 0;
	}

	void
	nv50_graph_takedown(struct drm_device *dev)
	{
	NV_DEBUG(dev, "\n");
	}

	void
	nv50_graph_fifo_access(struct drm_device *dev, bool enabled)
	{
	const uint32_t mask = 0x00010001;

	if (enabled)
	nv_wr32(dev, 0x400500, nv_rd32(dev, 0x400500) \| mask);
	else
	nv_wr32(dev, 0x400500, nv_rd32(dev, 0x400500) & ~mask);
	}

	struct nouveau_channel *
	nv50_graph_channel(struct drm_device *dev)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	uint32_t inst;
	int i;

	/* Be sure we're not in the middle of a context switch or bad things
	* will happen, such as unloading the wrong pgraph context.
	*/
	if (!nv_wait(dev, 0x400300, 0x00000001, 0x00000000))
	NV_ERROR(dev, "Ctxprog is still running\n");

	inst = nv_rd32(dev, NV50_PGRAPH_CTXCTL_CUR);
	if (!(inst & NV50_PGRAPH_CTXCTL_CUR_LOADED))
	return NULL;
	inst = (inst & NV50_PGRAPH_CTXCTL_CUR_INSTANCE) << 12;

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

	if (chan && chan->ramin && chan->ramin->vinst == inst)
	return chan;
	}

	return NULL;
	}

	int
	nv50_graph_create_context(struct nouveau_channel *chan)
	{
	struct drm_device *dev = chan->dev;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_gpuobj *ramin = chan->ramin;
	struct nouveau_pgraph_engine *pgraph = &dev_priv->engine.graph;
	struct nouveau_grctx ctx = {};
	int hdr, ret;

	NV_DEBUG(dev, "ch%d\n", chan->id);

	ret = nouveau_gpuobj_new(dev, chan, pgraph->grctx_size, 0x1000,
	NVOBJ_FLAG_ZERO_ALLOC \|
	NVOBJ_FLAG_ZERO_FREE, &chan->ramin_grctx);
	if (ret)
	return ret;

	hdr = (dev_priv->chipset == 0x50) ? 0x200 : 0x20;
	nv_wo32(ramin, hdr + 0x00, 0x00190002);
	nv_wo32(ramin, hdr + 0x04, chan->ramin_grctx->vinst +
	pgraph->grctx_size - 1);
	nv_wo32(ramin, hdr + 0x08, chan->ramin_grctx->vinst);
	nv_wo32(ramin, hdr + 0x0c, 0);
	nv_wo32(ramin, hdr + 0x10, 0);
	nv_wo32(ramin, hdr + 0x14, 0x00010000);

	ctx.dev = chan->dev;
	ctx.mode = NOUVEAU_GRCTX_VALS;
	ctx.data = chan->ramin_grctx;
	nv50_grctx_init(&ctx);

	nv_wo32(chan->ramin_grctx, 0x00000, chan->ramin->vinst >> 12);

	dev_priv->engine.instmem.flush(dev);
	return 0;
	}

	void
	nv50_graph_destroy_context(struct nouveau_channel *chan)
	{
	struct drm_device *dev = chan->dev;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	int i, hdr = (dev_priv->chipset == 0x50) ? 0x200 : 0x20;

	NV_DEBUG(dev, "ch%d\n", chan->id);

	if (!chan->ramin)
	return;

	for (i = hdr; i < hdr + 24; i += 4)
	nv_wo32(chan->ramin, i, 0);
	dev_priv->engine.instmem.flush(dev);

	nouveau_gpuobj_ref(NULL, &chan->ramin_grctx);
	}

	static int
	nv50_graph_do_load_context(struct drm_device *dev, uint32_t inst)
	{
	uint32_t fifo = nv_rd32(dev, 0x400500);

	nv_wr32(dev, 0x400500, fifo & ~1);
	nv_wr32(dev, 0x400784, inst);
	nv_wr32(dev, 0x400824, nv_rd32(dev, 0x400824) \| 0x40);
	nv_wr32(dev, 0x400320, nv_rd32(dev, 0x400320) \| 0x11);
	nv_wr32(dev, 0x400040, 0xffffffff);
	(void)nv_rd32(dev, 0x400040);
	nv_wr32(dev, 0x400040, 0x00000000);
	nv_wr32(dev, 0x400304, nv_rd32(dev, 0x400304) \| 1);

	if (nouveau_wait_for_idle(dev))
	nv_wr32(dev, 0x40032c, inst \| (1<<31));
	nv_wr32(dev, 0x400500, fifo);

	return 0;
	}

	int
	nv50_graph_load_context(struct nouveau_channel *chan)
	{
	uint32_t inst = chan->ramin->vinst >> 12;

	NV_DEBUG(chan->dev, "ch%d\n", chan->id);
	return nv50_graph_do_load_context(chan->dev, inst);
	}

	int
	nv50_graph_unload_context(struct drm_device *dev)
	{
	uint32_t inst;

	inst = nv_rd32(dev, NV50_PGRAPH_CTXCTL_CUR);
	if (!(inst & NV50_PGRAPH_CTXCTL_CUR_LOADED))
	return 0;
	inst &= NV50_PGRAPH_CTXCTL_CUR_INSTANCE;

	nouveau_wait_for_idle(dev);
	nv_wr32(dev, 0x400784, inst);
	nv_wr32(dev, 0x400824, nv_rd32(dev, 0x400824) \| 0x20);
	nv_wr32(dev, 0x400304, nv_rd32(dev, 0x400304) \| 0x01);
	nouveau_wait_for_idle(dev);

	nv_wr32(dev, NV50_PGRAPH_CTXCTL_CUR, inst);
	return 0;
	}

	void
	nv50_graph_context_switch(struct drm_device *dev)
	{
	uint32_t inst;

	nv50_graph_unload_context(dev);

	inst = nv_rd32(dev, NV50_PGRAPH_CTXCTL_NEXT);
	inst &= NV50_PGRAPH_CTXCTL_NEXT_INSTANCE;
	nv50_graph_do_load_context(dev, inst);

	nv_wr32(dev, NV40_PGRAPH_INTR_EN, nv_rd32(dev,
	NV40_PGRAPH_INTR_EN) \| NV_PGRAPH_INTR_CONTEXT_SWITCH);
	}

	static int
	nv50_graph_nvsw_dma_vblsem(struct nouveau_channel *chan, int grclass,
	int mthd, uint32_t data)
	{
	struct nouveau_gpuobj *gpuobj;

	gpuobj = nouveau_ramht_find(chan, data);
	if (!gpuobj)
	return -ENOENT;

	if (nouveau_notifier_offset(gpuobj, NULL))
	return -EINVAL;

	chan->nvsw.vblsem = gpuobj;
	chan->nvsw.vblsem_offset = ~0;
	return 0;
	}

	static int
	nv50_graph_nvsw_vblsem_offset(struct nouveau_channel *chan, int grclass,
	int mthd, uint32_t data)
	{
	if (nouveau_notifier_offset(chan->nvsw.vblsem, &data))
	return -ERANGE;

	chan->nvsw.vblsem_offset = data >> 2;
	return 0;
	}

	static int
	nv50_graph_nvsw_vblsem_release_val(struct nouveau_channel *chan, int grclass,
	int mthd, uint32_t data)
	{
	chan->nvsw.vblsem_rval = data;
	return 0;
	}

	static int
	nv50_graph_nvsw_vblsem_release(struct nouveau_channel *chan, int grclass,
	int mthd, uint32_t data)
	{
	struct drm_device *dev = chan->dev;
	struct drm_nouveau_private *dev_priv = dev->dev_private;

	if (!chan->nvsw.vblsem \|\| chan->nvsw.vblsem_offset == ~0 \|\| data > 1)
	return -EINVAL;

	if (!(nv_rd32(dev, NV50_PDISPLAY_INTR_EN) &
	NV50_PDISPLAY_INTR_EN_VBLANK_CRTC_(data))) {
	nv_wr32(dev, NV50_PDISPLAY_INTR_1,
	NV50_PDISPLAY_INTR_1_VBLANK_CRTC_(data));
	nv_wr32(dev, NV50_PDISPLAY_INTR_EN, nv_rd32(dev,
	NV50_PDISPLAY_INTR_EN) \|
	NV50_PDISPLAY_INTR_EN_VBLANK_CRTC_(data));
	}

	list_add(&chan->nvsw.vbl_wait, &dev_priv->vbl_waiting);
	return 0;
	}

	static struct nouveau_pgraph_object_method nv50_graph_nvsw_methods[] = {
	{ 0x018c, nv50_graph_nvsw_dma_vblsem },
	{ 0x0400, nv50_graph_nvsw_vblsem_offset },
	{ 0x0404, nv50_graph_nvsw_vblsem_release_val },
	{ 0x0408, nv50_graph_nvsw_vblsem_release },
	{}
	};

	struct nouveau_pgraph_object_class nv50_graph_grclass[] = {
	{ 0x506e, true, nv50_graph_nvsw_methods }, /* nvsw */
	{ 0x0030, false, NULL }, /* null */
	{ 0x5039, false, NULL }, /* m2mf */
	{ 0x502d, false, NULL }, /* 2d */
	{ 0x50c0, false, NULL }, /* compute */
	{ 0x85c0, false, NULL }, /* compute (nva3, nva5, nva8) */
	{ 0x5097, false, NULL }, /* tesla (nv50) */
	{ 0x8297, false, NULL }, /* tesla (nv8x/nv9x) */
	{ 0x8397, false, NULL }, /* tesla (nva0, nvaa, nvac) */
	{ 0x8597, false, NULL }, /* tesla (nva3, nva5, nva8) */
	{}
	};

	void
	nv50_graph_tlb_flush(struct drm_device *dev)
	{
	nv50_vm_flush(dev, 0);
	}

	void
	nv86_graph_tlb_flush(struct drm_device *dev)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_timer_engine *ptimer = &dev_priv->engine.timer;
	bool idle, timeout = false;
	unsigned long flags;
	u64 start;
	u32 tmp;

	spin_lock_irqsave(&dev_priv->context_switch_lock, flags);
	nv_mask(dev, 0x400500, 0x00000001, 0x00000000);

	start = ptimer->read(dev);
	do {
	idle = true;

	for (tmp = nv_rd32(dev, 0x400380); tmp && idle; tmp >>= 3) {
	if ((tmp & 7) == 1)
	idle = false;
	}

	for (tmp = nv_rd32(dev, 0x400384); tmp && idle; tmp >>= 3) {
	if ((tmp & 7) == 1)
	idle = false;
	}

	for (tmp = nv_rd32(dev, 0x400388); tmp && idle; tmp >>= 3) {
	if ((tmp & 7) == 1)
	idle = false;
	}
	} while (!idle && !(timeout = ptimer->read(dev) - start > 2000000000));

	if (timeout) {
	NV_ERROR(dev, "PGRAPH TLB flush idle timeout fail: "
	"0x%08x 0x%08x 0x%08x 0x%08x\n",
	nv_rd32(dev, 0x400700), nv_rd32(dev, 0x400380),
	nv_rd32(dev, 0x400384), nv_rd32(dev, 0x400388));
	}

	nv50_vm_flush(dev, 0);

	nv_mask(dev, 0x400500, 0x00000001, 0x00000001);
	spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags);
	}