shared-core/nv50_instmem.c - platform/external/libdrm - 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"

 typedef struct {
 	uint32_t save1700[5]; /* 0x1700->0x1710 */

 	struct nouveau_gpuobj_ref *pramin_pt;
 	struct nouveau_gpuobj_ref *pramin_bar;
 } nv50_instmem_priv;

 #define NV50_INSTMEM_PAGE_SHIFT 12
 #define NV50_INSTMEM_PAGE_SIZE  (1 << NV50_INSTMEM_PAGE_SHIFT)
 #define NV50_INSTMEM_PT_SIZE(a)	(((a) >> 12) << 3)

 /*NOTE: - Assumes 0x1700 already covers the correct MiB of PRAMIN
  */
 #define BAR0_WI32(g,o,v) do {                                     \
 	uint32_t offset;                                          \
 	if ((g)->im_backing) {                                    \
 		offset = (g)->im_backing->start;                  \
 	} else {                                                  \
 		offset  = chan->ramin->gpuobj->im_backing->start; \
 		offset += (g)->im_pramin->start;                  \
 	}                                                         \
 	offset += (o);                                            \
 	NV_WRITE(NV_RAMIN + (offset & 0xfffff), (v));             \
 } while(0)

 int
 nv50_instmem_init(struct drm_device *dev)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_channel *chan;
 	uint32_t c_offset, c_size, c_ramfc, c_vmpd, c_base, pt_size;
 	nv50_instmem_priv *priv;
 	int ret, i;
 	uint32_t v;

 	priv = drm_calloc(1, sizeof(*priv), DRM_MEM_DRIVER);
 	if (!priv)
 		return -ENOMEM;
 	dev_priv->Engine.instmem.priv = priv;

 	/* Reserve the last MiB of VRAM, we should probably try to avoid
 	 * setting up the below tables over the top of the VBIOS image at
 	 * some point.
 	 */
 	dev_priv->ramin_rsvd_vram = 1 << 20;
 	c_offset = nouveau_mem_fb_amount(dev) - dev_priv->ramin_rsvd_vram;
 	c_size   = 128 << 10;
 	c_vmpd   = ((dev_priv->chipset & 0xf0) == 0x50) ? 0x1400 : 0x200;
 	c_ramfc  = ((dev_priv->chipset & 0xf0) == 0x50) ? 0x0 : 0x20;
 	c_base   = c_vmpd + 0x4000;
 	pt_size  = NV50_INSTMEM_PT_SIZE(dev_priv->ramin->size);

 	DRM_DEBUG(" Rsvd VRAM base: 0x%08x\n", c_offset);
 	DRM_DEBUG("    VBIOS image: 0x%08x\n", (NV_READ(0x619f04)&~0xff)<<8);
 	DRM_DEBUG("  Aperture size: %d MiB\n",
 		  (uint32_t)dev_priv->ramin->size >> 20);
 	DRM_DEBUG("        PT size: %d KiB\n", pt_size >> 10);

 	NV_WRITE(NV50_PUNK_BAR0_PRAMIN, (c_offset >> 16));

 	/* Create a fake channel, and use it as our "dummy" channels 0/127.
 	 * The main reason for creating a channel is so we can use the gpuobj
 	 * code.  However, it's probably worth noting that NVIDIA also setup
 	 * their channels 0/127 with the same values they configure here.
 	 * So, there may be some other reason for doing this.
 	 *
 	 * Have to create the entire channel manually, as the real channel
 	 * creation code assumes we have PRAMIN access, and we don't until
 	 * we're done here.
 	 */
 	chan = drm_calloc(1, sizeof(*chan), DRM_MEM_DRIVER);
 	if (!chan)
 		return -ENOMEM;
 	chan->id = 0;
 	chan->dev = dev;
 	chan->file_priv = (struct drm_file *)-2;
 	dev_priv->fifos[0] = dev_priv->fifos[127] = chan;

 	/* Channel's PRAMIN object + heap */
 	if ((ret = nouveau_gpuobj_new_fake(dev, 0, c_offset, 128<<10, 0,
 					   NULL, &chan->ramin)))
 		return ret;

 	if (nouveau_mem_init_heap(&chan->ramin_heap, c_base, c_size - c_base))
 		return -ENOMEM;

 	/* RAMFC + zero channel's PRAMIN up to start of VM pagedir */
 	if ((ret = nouveau_gpuobj_new_fake(dev, c_ramfc, c_offset + c_ramfc,
 					   0x4000, 0, NULL, &chan->ramfc)))
 		return ret;

 	for (i = 0; i < c_vmpd; i += 4)
 		BAR0_WI32(chan->ramin->gpuobj, i, 0);

 	/* VM page directory */
 	if ((ret = nouveau_gpuobj_new_fake(dev, c_vmpd, c_offset + c_vmpd,
 					   0x4000, 0, &chan->vm_pd, NULL)))
 		return ret;
 	for (i = 0; i < 0x4000; i += 8) {
 		BAR0_WI32(chan->vm_pd, i + 0x00, 0x00000000);
 		BAR0_WI32(chan->vm_pd, i + 0x04, 0x00000000);
 	}

 	/* PRAMIN page table, cheat and map into VM at 0x0000000000.
 	 * We map the entire fake channel into the start of the PRAMIN BAR
 	 */
 	if ((ret = nouveau_gpuobj_new_ref(dev, chan, NULL, 0, pt_size, 0x1000,
 					  0, &priv->pramin_pt)))
 		return ret;

 	for (i = 0, v = c_offset; i < pt_size; i+=8, v+=0x1000) {
 		if (v < (c_offset + c_size))
 			BAR0_WI32(priv->pramin_pt->gpuobj, i + 0, v | 1);
 		else
 			BAR0_WI32(priv->pramin_pt->gpuobj, i + 0, 0x00000009);
 		BAR0_WI32(priv->pramin_pt->gpuobj, i + 4, 0x00000000);
 	}

 	BAR0_WI32(chan->vm_pd, 0x00, priv->pramin_pt->instance | 0x63);
 	BAR0_WI32(chan->vm_pd, 0x04, 0x00000000);

 	/* DMA object for PRAMIN BAR */
 	if ((ret = nouveau_gpuobj_new_ref(dev, chan, chan, 0, 6*4, 16, 0,
 					  &priv->pramin_bar)))
 		return ret;
 	BAR0_WI32(priv->pramin_bar->gpuobj, 0x00, 0x7fc00000);
 	BAR0_WI32(priv->pramin_bar->gpuobj, 0x04, dev_priv->ramin->size - 1);
 	BAR0_WI32(priv->pramin_bar->gpuobj, 0x08, 0x00000000);
 	BAR0_WI32(priv->pramin_bar->gpuobj, 0x0c, 0x00000000);
 	BAR0_WI32(priv->pramin_bar->gpuobj, 0x10, 0x00000000);
 	BAR0_WI32(priv->pramin_bar->gpuobj, 0x14, 0x00000000);

 	/* Poke the relevant regs, and pray it works :) */
 	NV_WRITE(NV50_PUNK_BAR_CFG_BASE, (chan->ramin->instance >> 12));
 	NV_WRITE(NV50_PUNK_UNK1710, 0);
 	NV_WRITE(NV50_PUNK_BAR_CFG_BASE, (chan->ramin->instance >> 12) |
 					 NV50_PUNK_BAR_CFG_BASE_VALID);
 	NV_WRITE(NV50_PUNK_BAR1_CTXDMA, 0);
 	NV_WRITE(NV50_PUNK_BAR3_CTXDMA, (priv->pramin_bar->instance >> 4) |
 					NV50_PUNK_BAR3_CTXDMA_VALID);

 	/* Assume that praying isn't enough, check that we can re-read the
 	 * entire fake channel back from the PRAMIN BAR */
 	for (i = 0; i < c_size; i+=4) {
 		if (NV_READ(NV_RAMIN + i) != NV_RI32(i)) {
 			DRM_ERROR("Error reading back PRAMIN at 0x%08x\n", i);
 			return -EINVAL;
 		}
 	}

 	/* Global PRAMIN heap */
 	if (nouveau_mem_init_heap(&dev_priv->ramin_heap,
 				  c_size, dev_priv->ramin->size - c_size)) {
 		dev_priv->ramin_heap = NULL;
 		DRM_ERROR("Failed to init RAMIN heap\n");
 	}

 	/*XXX: incorrect, but needed to make hash func "work" */
 	dev_priv->ramht_offset = 0x10000;
 	dev_priv->ramht_bits   = 9;
 	dev_priv->ramht_size   = (1 << dev_priv->ramht_bits);
 	return 0;
 }

 void
 nv50_instmem_takedown(struct drm_device *dev)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	nv50_instmem_priv *priv = dev_priv->Engine.instmem.priv;
 	struct nouveau_channel *chan = dev_priv->fifos[0];
 	int i;

 	DRM_DEBUG("\n");

 	if (!priv)
 		return;

 	/* Restore state from before init */
 	for (i = 0x1700; i <= 0x1710; i+=4)
 		NV_WRITE(i, priv->save1700[(i-0x1700)/4]);

 	nouveau_gpuobj_ref_del(dev, &priv->pramin_bar);
 	nouveau_gpuobj_ref_del(dev, &priv->pramin_pt);

 	/* Destroy dummy channel */
 	if (chan) {
 		nouveau_gpuobj_del(dev, &chan->vm_pd);
 		nouveau_gpuobj_ref_del(dev, &chan->ramfc);
 		nouveau_gpuobj_ref_del(dev, &chan->ramin);
 		nouveau_mem_takedown(&chan->ramin_heap);

 		dev_priv->fifos[0] = dev_priv->fifos[127] = NULL;
 		drm_free(chan, sizeof(*chan), DRM_MEM_DRIVER);
 	}

 	dev_priv->Engine.instmem.priv = NULL;
 	drm_free(priv, sizeof(*priv), DRM_MEM_DRIVER);
 }

 int
 nv50_instmem_populate(struct drm_device *dev, struct nouveau_gpuobj *gpuobj, uint32_t *sz)
 {
 	if (gpuobj->im_backing)
 		return -EINVAL;

 	*sz = (*sz + (NV50_INSTMEM_PAGE_SIZE-1)) & ~(NV50_INSTMEM_PAGE_SIZE-1);
 	if (*sz == 0)
 		return -EINVAL;

 	gpuobj->im_backing = nouveau_mem_alloc(dev, NV50_INSTMEM_PAGE_SIZE,
 					       *sz, NOUVEAU_MEM_FB,
 					       (struct drm_file *)-2);
 	if (!gpuobj->im_backing) {
 		DRM_ERROR("Couldn't allocate vram to back PRAMIN pages\n");
 		return -ENOMEM;
 	}

 	return 0;
 }

 void
 nv50_instmem_clear(struct drm_device *dev, struct nouveau_gpuobj *gpuobj)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;

 	if (gpuobj && gpuobj->im_backing) {
 		if (gpuobj->im_bound)
 			dev_priv->Engine.instmem.unbind(dev, gpuobj);
 		nouveau_mem_free(dev, gpuobj->im_backing);
 		gpuobj->im_backing = NULL;
 	}
 }

 int
 nv50_instmem_bind(struct drm_device *dev, struct nouveau_gpuobj *gpuobj)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	nv50_instmem_priv *priv = dev_priv->Engine.instmem.priv;
 	uint32_t pte, pte_end, vram;

 	if (!gpuobj->im_backing || !gpuobj->im_pramin || gpuobj->im_bound)
 		return -EINVAL;

 	DRM_DEBUG("st=0x%0llx sz=0x%0llx\n",
 		  gpuobj->im_pramin->start, gpuobj->im_pramin->size);

 	pte     = (gpuobj->im_pramin->start >> 12) << 3;
 	pte_end = ((gpuobj->im_pramin->size >> 12) << 3) + pte;
 	vram    = gpuobj->im_backing->start;

 	DRM_DEBUG("pramin=0x%llx, pte=%d, pte_end=%d\n",
 		  gpuobj->im_pramin->start, pte, pte_end);
 	DRM_DEBUG("first vram page: 0x%llx\n",
 		  gpuobj->im_backing->start);

 	while (pte < pte_end) {
 		INSTANCE_WR(priv->pramin_pt->gpuobj, (pte + 0)/4, vram | 1);
 		INSTANCE_WR(priv->pramin_pt->gpuobj, (pte + 4)/4, 0x00000000);

 		pte += 8;
 		vram += NV50_INSTMEM_PAGE_SIZE;
 	}

 	gpuobj->im_bound = 1;
 	return 0;
 }

 int
 nv50_instmem_unbind(struct drm_device *dev, struct nouveau_gpuobj *gpuobj)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	nv50_instmem_priv *priv = dev_priv->Engine.instmem.priv;
 	uint32_t pte, pte_end;

 	if (gpuobj->im_bound == 0)
 		return -EINVAL;

 	pte     = (gpuobj->im_pramin->start >> 12) << 3;
 	pte_end = ((gpuobj->im_pramin->size >> 12) << 3) + pte;
 	while (pte < pte_end) {
 		INSTANCE_WR(priv->pramin_pt->gpuobj, (pte + 0)/4, 0x00000009);
 		INSTANCE_WR(priv->pramin_pt->gpuobj, (pte + 4)/4, 0x00000000);
 		pte += 8;
 	}

 	gpuobj->im_bound = 0;
 	return 0;
 }
	/*
	* 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"

	typedef struct {
	uint32_t save1700[5]; /* 0x1700->0x1710 */

	struct nouveau_gpuobj_ref *pramin_pt;
	struct nouveau_gpuobj_ref *pramin_bar;
	} nv50_instmem_priv;

	#define NV50_INSTMEM_PAGE_SHIFT 12
	#define NV50_INSTMEM_PAGE_SIZE (1 << NV50_INSTMEM_PAGE_SHIFT)
	#define NV50_INSTMEM_PT_SIZE(a) (((a) >> 12) << 3)

	/*NOTE: - Assumes 0x1700 already covers the correct MiB of PRAMIN
	*/
	#define BAR0_WI32(g,o,v) do { \
	uint32_t offset; \
	if ((g)->im_backing) { \
	offset = (g)->im_backing->start; \
	} else { \
	offset = chan->ramin->gpuobj->im_backing->start; \
	offset += (g)->im_pramin->start; \
	} \
	offset += (o); \
	NV_WRITE(NV_RAMIN + (offset & 0xfffff), (v)); \
	} while(0)

	int
	nv50_instmem_init(struct drm_device *dev)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_channel *chan;
	uint32_t c_offset, c_size, c_ramfc, c_vmpd, c_base, pt_size;
	nv50_instmem_priv *priv;
	int ret, i;
	uint32_t v;

	priv = drm_calloc(1, sizeof(*priv), DRM_MEM_DRIVER);
	if (!priv)
	return -ENOMEM;
	dev_priv->Engine.instmem.priv = priv;

	/* Reserve the last MiB of VRAM, we should probably try to avoid
	* setting up the below tables over the top of the VBIOS image at
	* some point.
	*/
	dev_priv->ramin_rsvd_vram = 1 << 20;
	c_offset = nouveau_mem_fb_amount(dev) - dev_priv->ramin_rsvd_vram;
	c_size = 128 << 10;
	c_vmpd = ((dev_priv->chipset & 0xf0) == 0x50) ? 0x1400 : 0x200;
	c_ramfc = ((dev_priv->chipset & 0xf0) == 0x50) ? 0x0 : 0x20;
	c_base = c_vmpd + 0x4000;
	pt_size = NV50_INSTMEM_PT_SIZE(dev_priv->ramin->size);

	DRM_DEBUG(" Rsvd VRAM base: 0x%08x\n", c_offset);
	DRM_DEBUG(" VBIOS image: 0x%08x\n", (NV_READ(0x619f04)&~0xff)<<8);
	DRM_DEBUG(" Aperture size: %d MiB\n",
	(uint32_t)dev_priv->ramin->size >> 20);
	DRM_DEBUG(" PT size: %d KiB\n", pt_size >> 10);

	NV_WRITE(NV50_PUNK_BAR0_PRAMIN, (c_offset >> 16));

	/* Create a fake channel, and use it as our "dummy" channels 0/127.
	* The main reason for creating a channel is so we can use the gpuobj
	* code. However, it's probably worth noting that NVIDIA also setup
	* their channels 0/127 with the same values they configure here.
	* So, there may be some other reason for doing this.
	*
	* Have to create the entire channel manually, as the real channel
	* creation code assumes we have PRAMIN access, and we don't until
	* we're done here.
	*/
	chan = drm_calloc(1, sizeof(*chan), DRM_MEM_DRIVER);
	if (!chan)
	return -ENOMEM;
	chan->id = 0;
	chan->dev = dev;
	chan->file_priv = (struct drm_file *)-2;
	dev_priv->fifos[0] = dev_priv->fifos[127] = chan;

	/* Channel's PRAMIN object + heap */
	if ((ret = nouveau_gpuobj_new_fake(dev, 0, c_offset, 128<<10, 0,
	NULL, &chan->ramin)))
	return ret;

	if (nouveau_mem_init_heap(&chan->ramin_heap, c_base, c_size - c_base))
	return -ENOMEM;

	/* RAMFC + zero channel's PRAMIN up to start of VM pagedir */
	if ((ret = nouveau_gpuobj_new_fake(dev, c_ramfc, c_offset + c_ramfc,
	0x4000, 0, NULL, &chan->ramfc)))
	return ret;

	for (i = 0; i < c_vmpd; i += 4)
	BAR0_WI32(chan->ramin->gpuobj, i, 0);

	/* VM page directory */
	if ((ret = nouveau_gpuobj_new_fake(dev, c_vmpd, c_offset + c_vmpd,
	0x4000, 0, &chan->vm_pd, NULL)))
	return ret;
	for (i = 0; i < 0x4000; i += 8) {
	BAR0_WI32(chan->vm_pd, i + 0x00, 0x00000000);
	BAR0_WI32(chan->vm_pd, i + 0x04, 0x00000000);
	}

	/* PRAMIN page table, cheat and map into VM at 0x0000000000.
	* We map the entire fake channel into the start of the PRAMIN BAR
	*/
	if ((ret = nouveau_gpuobj_new_ref(dev, chan, NULL, 0, pt_size, 0x1000,
	0, &priv->pramin_pt)))
	return ret;

	for (i = 0, v = c_offset; i < pt_size; i+=8, v+=0x1000) {
	if (v < (c_offset + c_size))
	BAR0_WI32(priv->pramin_pt->gpuobj, i + 0, v \| 1);
	else
	BAR0_WI32(priv->pramin_pt->gpuobj, i + 0, 0x00000009);
	BAR0_WI32(priv->pramin_pt->gpuobj, i + 4, 0x00000000);
	}

	BAR0_WI32(chan->vm_pd, 0x00, priv->pramin_pt->instance \| 0x63);
	BAR0_WI32(chan->vm_pd, 0x04, 0x00000000);

	/* DMA object for PRAMIN BAR */
	if ((ret = nouveau_gpuobj_new_ref(dev, chan, chan, 0, 6*4, 16, 0,
	&priv->pramin_bar)))
	return ret;
	BAR0_WI32(priv->pramin_bar->gpuobj, 0x00, 0x7fc00000);
	BAR0_WI32(priv->pramin_bar->gpuobj, 0x04, dev_priv->ramin->size - 1);
	BAR0_WI32(priv->pramin_bar->gpuobj, 0x08, 0x00000000);
	BAR0_WI32(priv->pramin_bar->gpuobj, 0x0c, 0x00000000);
	BAR0_WI32(priv->pramin_bar->gpuobj, 0x10, 0x00000000);
	BAR0_WI32(priv->pramin_bar->gpuobj, 0x14, 0x00000000);

	/* Poke the relevant regs, and pray it works :) */
	NV_WRITE(NV50_PUNK_BAR_CFG_BASE, (chan->ramin->instance >> 12));
	NV_WRITE(NV50_PUNK_UNK1710, 0);
	NV_WRITE(NV50_PUNK_BAR_CFG_BASE, (chan->ramin->instance >> 12) \|
	NV50_PUNK_BAR_CFG_BASE_VALID);
	NV_WRITE(NV50_PUNK_BAR1_CTXDMA, 0);
	NV_WRITE(NV50_PUNK_BAR3_CTXDMA, (priv->pramin_bar->instance >> 4) \|
	NV50_PUNK_BAR3_CTXDMA_VALID);

	/* Assume that praying isn't enough, check that we can re-read the
	* entire fake channel back from the PRAMIN BAR */
	for (i = 0; i < c_size; i+=4) {
	if (NV_READ(NV_RAMIN + i) != NV_RI32(i)) {
	DRM_ERROR("Error reading back PRAMIN at 0x%08x\n", i);
	return -EINVAL;
	}
	}

	/* Global PRAMIN heap */
	if (nouveau_mem_init_heap(&dev_priv->ramin_heap,
	c_size, dev_priv->ramin->size - c_size)) {
	dev_priv->ramin_heap = NULL;
	DRM_ERROR("Failed to init RAMIN heap\n");
	}

	/XXX: incorrect, but needed to make hash func "work" /
	dev_priv->ramht_offset = 0x10000;
	dev_priv->ramht_bits = 9;
	dev_priv->ramht_size = (1 << dev_priv->ramht_bits);
	return 0;
	}

	void
	nv50_instmem_takedown(struct drm_device *dev)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	nv50_instmem_priv *priv = dev_priv->Engine.instmem.priv;
	struct nouveau_channel *chan = dev_priv->fifos[0];
	int i;

	DRM_DEBUG("\n");

	if (!priv)
	return;

	/* Restore state from before init */
	for (i = 0x1700; i <= 0x1710; i+=4)
	NV_WRITE(i, priv->save1700[(i-0x1700)/4]);

	nouveau_gpuobj_ref_del(dev, &priv->pramin_bar);
	nouveau_gpuobj_ref_del(dev, &priv->pramin_pt);

	/* Destroy dummy channel */
	if (chan) {
	nouveau_gpuobj_del(dev, &chan->vm_pd);
	nouveau_gpuobj_ref_del(dev, &chan->ramfc);
	nouveau_gpuobj_ref_del(dev, &chan->ramin);
	nouveau_mem_takedown(&chan->ramin_heap);

	dev_priv->fifos[0] = dev_priv->fifos[127] = NULL;
	drm_free(chan, sizeof(*chan), DRM_MEM_DRIVER);
	}

	dev_priv->Engine.instmem.priv = NULL;
	drm_free(priv, sizeof(*priv), DRM_MEM_DRIVER);
	}

	int
	nv50_instmem_populate(struct drm_device dev, struct nouveau_gpuobj gpuobj, uint32_t *sz)
	{
	if (gpuobj->im_backing)
	return -EINVAL;

	sz = (sz + (NV50_INSTMEM_PAGE_SIZE-1)) & ~(NV50_INSTMEM_PAGE_SIZE-1);
	if (*sz == 0)
	return -EINVAL;

	gpuobj->im_backing = nouveau_mem_alloc(dev, NV50_INSTMEM_PAGE_SIZE,
	*sz, NOUVEAU_MEM_FB,
	(struct drm_file *)-2);
	if (!gpuobj->im_backing) {
	DRM_ERROR("Couldn't allocate vram to back PRAMIN pages\n");
	return -ENOMEM;
	}

	return 0;
	}

	void
	nv50_instmem_clear(struct drm_device dev, struct nouveau_gpuobj gpuobj)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;

	if (gpuobj && gpuobj->im_backing) {
	if (gpuobj->im_bound)
	dev_priv->Engine.instmem.unbind(dev, gpuobj);
	nouveau_mem_free(dev, gpuobj->im_backing);
	gpuobj->im_backing = NULL;
	}
	}

	int
	nv50_instmem_bind(struct drm_device dev, struct nouveau_gpuobj gpuobj)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	nv50_instmem_priv *priv = dev_priv->Engine.instmem.priv;
	uint32_t pte, pte_end, vram;

	if (!gpuobj->im_backing \|\| !gpuobj->im_pramin \|\| gpuobj->im_bound)
	return -EINVAL;

	DRM_DEBUG("st=0x%0llx sz=0x%0llx\n",
	gpuobj->im_pramin->start, gpuobj->im_pramin->size);

	pte = (gpuobj->im_pramin->start >> 12) << 3;
	pte_end = ((gpuobj->im_pramin->size >> 12) << 3) + pte;
	vram = gpuobj->im_backing->start;

	DRM_DEBUG("pramin=0x%llx, pte=%d, pte_end=%d\n",
	gpuobj->im_pramin->start, pte, pte_end);
	DRM_DEBUG("first vram page: 0x%llx\n",
	gpuobj->im_backing->start);

	while (pte < pte_end) {
	INSTANCE_WR(priv->pramin_pt->gpuobj, (pte + 0)/4, vram \| 1);
	INSTANCE_WR(priv->pramin_pt->gpuobj, (pte + 4)/4, 0x00000000);

	pte += 8;
	vram += NV50_INSTMEM_PAGE_SIZE;
	}

	gpuobj->im_bound = 1;
	return 0;
	}

	int
	nv50_instmem_unbind(struct drm_device dev, struct nouveau_gpuobj gpuobj)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	nv50_instmem_priv *priv = dev_priv->Engine.instmem.priv;
	uint32_t pte, pte_end;

	if (gpuobj->im_bound == 0)
	return -EINVAL;

	pte = (gpuobj->im_pramin->start >> 12) << 3;
	pte_end = ((gpuobj->im_pramin->size >> 12) << 3) + pte;
	while (pte < pte_end) {
	INSTANCE_WR(priv->pramin_pt->gpuobj, (pte + 0)/4, 0x00000009);
	INSTANCE_WR(priv->pramin_pt->gpuobj, (pte + 4)/4, 0x00000000);
	pte += 8;
	}

	gpuobj->im_bound = 0;
	return 0;
	}