drivers/gpu/drm/radeon/radeon_cs.c - kernel/msm - Gitiles

 /*
  * Copyright 2008 Jerome Glisse.
  * 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
  * PRECISION INSIGHT 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:
  *    Jerome Glisse <glisse@freedesktop.org>
  */
 #include "drmP.h"
 #include "radeon_drm.h"
 #include "radeon_reg.h"
 #include "radeon.h"

 void r100_cs_dump_packet(struct radeon_cs_parser *p,
 			 struct radeon_cs_packet *pkt);

 int radeon_cs_parser_relocs(struct radeon_cs_parser *p)
 {
 	struct drm_device *ddev = p->rdev->ddev;
 	struct radeon_cs_chunk *chunk;
 	unsigned i, j;
 	bool duplicate;

 	if (p->chunk_relocs_idx == -1) {
 		return 0;
 	}
 	chunk = &p->chunks[p->chunk_relocs_idx];
 	/* FIXME: we assume that each relocs use 4 dwords */
 	p->nrelocs = chunk->length_dw / 4;
 	p->relocs_ptr = kcalloc(p->nrelocs, sizeof(void *), GFP_KERNEL);
 	if (p->relocs_ptr == NULL) {
 		return -ENOMEM;
 	}
 	p->relocs = kcalloc(p->nrelocs, sizeof(struct radeon_cs_reloc), GFP_KERNEL);
 	if (p->relocs == NULL) {
 		return -ENOMEM;
 	}
 	for (i = 0; i < p->nrelocs; i++) {
 		struct drm_radeon_cs_reloc *r;

 		duplicate = false;
 		r = (struct drm_radeon_cs_reloc *)&chunk->kdata[i*4];
 		for (j = 0; j < p->nrelocs; j++) {
 			if (r->handle == p->relocs[j].handle) {
 				p->relocs_ptr[i] = &p->relocs[j];
 				duplicate = true;
 				break;
 			}
 		}
 		if (!duplicate) {
 			p->relocs[i].gobj = drm_gem_object_lookup(ddev,
 								  p->filp,
 								  r->handle);
 			if (p->relocs[i].gobj == NULL) {
 				DRM_ERROR("gem object lookup failed 0x%x\n",
 					  r->handle);
 				return -EINVAL;
 			}
 			p->relocs_ptr[i] = &p->relocs[i];
 			p->relocs[i].robj = p->relocs[i].gobj->driver_private;
 			p->relocs[i].lobj.bo = p->relocs[i].robj;
 			p->relocs[i].lobj.rdomain = r->read_domains;
 			p->relocs[i].lobj.wdomain = r->write_domain;
 			p->relocs[i].handle = r->handle;
 			p->relocs[i].flags = r->flags;
 			INIT_LIST_HEAD(&p->relocs[i].lobj.list);
 			radeon_bo_list_add_object(&p->relocs[i].lobj,
 						&p->validated);
 		}
 	}
 	return radeon_bo_list_validate(&p->validated);
 }

 int radeon_cs_parser_init(struct radeon_cs_parser *p, void *data)
 {
 	struct drm_radeon_cs *cs = data;
 	uint64_t *chunk_array_ptr;
 	unsigned size, i;

 	if (!cs->num_chunks) {
 		return 0;
 	}
 	/* get chunks */
 	INIT_LIST_HEAD(&p->validated);
 	p->idx = 0;
 	p->chunk_ib_idx = -1;
 	p->chunk_relocs_idx = -1;
 	p->chunks_array = kcalloc(cs->num_chunks, sizeof(uint64_t), GFP_KERNEL);
 	if (p->chunks_array == NULL) {
 		return -ENOMEM;
 	}
 	chunk_array_ptr = (uint64_t *)(unsigned long)(cs->chunks);
 	if (DRM_COPY_FROM_USER(p->chunks_array, chunk_array_ptr,
 			       sizeof(uint64_t)*cs->num_chunks)) {
 		return -EFAULT;
 	}
 	p->nchunks = cs->num_chunks;
 	p->chunks = kcalloc(p->nchunks, sizeof(struct radeon_cs_chunk), GFP_KERNEL);
 	if (p->chunks == NULL) {
 		return -ENOMEM;
 	}
 	for (i = 0; i < p->nchunks; i++) {
 		struct drm_radeon_cs_chunk __user **chunk_ptr = NULL;
 		struct drm_radeon_cs_chunk user_chunk;
 		uint32_t __user *cdata;

 		chunk_ptr = (void __user*)(unsigned long)p->chunks_array[i];
 		if (DRM_COPY_FROM_USER(&user_chunk, chunk_ptr,
 				       sizeof(struct drm_radeon_cs_chunk))) {
 			return -EFAULT;
 		}
 		p->chunks[i].length_dw = user_chunk.length_dw;
 		p->chunks[i].kdata = NULL;
 		p->chunks[i].chunk_id = user_chunk.chunk_id;

 		if (p->chunks[i].chunk_id == RADEON_CHUNK_ID_RELOCS) {
 			p->chunk_relocs_idx = i;
 		}
 		if (p->chunks[i].chunk_id == RADEON_CHUNK_ID_IB) {
 			p->chunk_ib_idx = i;
 			/* zero length IB isn't useful */
 			if (p->chunks[i].length_dw == 0)
 				return -EINVAL;
 		}

 		p->chunks[i].length_dw = user_chunk.length_dw;
 		p->chunks[i].user_ptr = (void __user *)(unsigned long)user_chunk.chunk_data;

 		cdata = (uint32_t *)(unsigned long)user_chunk.chunk_data;
 		if (p->chunks[i].chunk_id != RADEON_CHUNK_ID_IB) {
 			size = p->chunks[i].length_dw * sizeof(uint32_t);
 			p->chunks[i].kdata = kmalloc(size, GFP_KERNEL);
 			if (p->chunks[i].kdata == NULL) {
 				return -ENOMEM;
 			}
 			if (DRM_COPY_FROM_USER(p->chunks[i].kdata,
 					       p->chunks[i].user_ptr, size)) {
 				return -EFAULT;
 			}
 		} else {
 			p->chunks[i].kpage[0] = kmalloc(PAGE_SIZE, GFP_KERNEL);
 			p->chunks[i].kpage[1] = kmalloc(PAGE_SIZE, GFP_KERNEL);
 			if (p->chunks[i].kpage[0] == NULL || p->chunks[i].kpage[1] == NULL) {
 				kfree(p->chunks[i].kpage[0]);
 				kfree(p->chunks[i].kpage[1]);
 				return -ENOMEM;
 			}
 			p->chunks[i].kpage_idx[0] = -1;
 			p->chunks[i].kpage_idx[1] = -1;
 			p->chunks[i].last_copied_page = -1;
 			p->chunks[i].last_page_index = ((p->chunks[i].length_dw * 4) - 1) / PAGE_SIZE;
 		}
 	}
 	if (p->chunks[p->chunk_ib_idx].length_dw > (16 * 1024)) {
 		DRM_ERROR("cs IB too big: %d\n",
 			  p->chunks[p->chunk_ib_idx].length_dw);
 		return -EINVAL;
 	}
 	return 0;
 }

 /**
  * cs_parser_fini() - clean parser states
  * @parser:	parser structure holding parsing context.
  * @error:	error number
  *
  * If error is set than unvalidate buffer, otherwise just free memory
  * used by parsing context.
  **/
 static void radeon_cs_parser_fini(struct radeon_cs_parser *parser, int error)
 {
 	unsigned i;

 	if (!error && parser->ib) {
 		radeon_bo_list_fence(&parser->validated, parser->ib->fence);
 	}
 	radeon_bo_list_unreserve(&parser->validated);
 	if (parser->relocs != NULL) {
 		for (i = 0; i < parser->nrelocs; i++) {
 			if (parser->relocs[i].gobj)
 				drm_gem_object_unreference_unlocked(parser->relocs[i].gobj);
 		}
 	}
 	kfree(parser->track);
 	kfree(parser->relocs);
 	kfree(parser->relocs_ptr);
 	for (i = 0; i < parser->nchunks; i++) {
 		kfree(parser->chunks[i].kdata);
 		kfree(parser->chunks[i].kpage[0]);
 		kfree(parser->chunks[i].kpage[1]);
 	}
 	kfree(parser->chunks);
 	kfree(parser->chunks_array);
 	radeon_ib_free(parser->rdev, &parser->ib);
 }

 int radeon_cs_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
 {
 	struct radeon_device *rdev = dev->dev_private;
 	struct radeon_cs_parser parser;
 	struct radeon_cs_chunk *ib_chunk;
 	int r;

 	mutex_lock(&rdev->cs_mutex);
 	if (rdev->gpu_lockup) {
 		mutex_unlock(&rdev->cs_mutex);
 		return -EINVAL;
 	}
 	/* initialize parser */
 	memset(&parser, 0, sizeof(struct radeon_cs_parser));
 	parser.filp = filp;
 	parser.rdev = rdev;
 	parser.dev = rdev->dev;
 	r = radeon_cs_parser_init(&parser, data);
 	if (r) {
 		DRM_ERROR("Failed to initialize parser !\n");
 		radeon_cs_parser_fini(&parser, r);
 		mutex_unlock(&rdev->cs_mutex);
 		return r;
 	}
 	r =  radeon_ib_get(rdev, &parser.ib);
 	if (r) {
 		DRM_ERROR("Failed to get ib !\n");
 		radeon_cs_parser_fini(&parser, r);
 		mutex_unlock(&rdev->cs_mutex);
 		return r;
 	}
 	r = radeon_cs_parser_relocs(&parser);
 	if (r) {
 		if (r != -ERESTARTSYS)
 			DRM_ERROR("Failed to parse relocation %d!\n", r);
 		radeon_cs_parser_fini(&parser, r);
 		mutex_unlock(&rdev->cs_mutex);
 		return r;
 	}
 	/* Copy the packet into the IB, the parser will read from the
 	 * input memory (cached) and write to the IB (which can be
 	 * uncached). */
 	ib_chunk = &parser.chunks[parser.chunk_ib_idx];
 	parser.ib->length_dw = ib_chunk->length_dw;
 	r = radeon_cs_parse(&parser);
 	if (r || parser.parser_error) {
 		DRM_ERROR("Invalid command stream !\n");
 		radeon_cs_parser_fini(&parser, r);
 		mutex_unlock(&rdev->cs_mutex);
 		return r;
 	}
 	r = radeon_cs_finish_pages(&parser);
 	if (r) {
 		DRM_ERROR("Invalid command stream !\n");
 		radeon_cs_parser_fini(&parser, r);
 		mutex_unlock(&rdev->cs_mutex);
 		return r;
 	}
 	r = radeon_ib_schedule(rdev, parser.ib);
 	if (r) {
 		DRM_ERROR("Faild to schedule IB !\n");
 	}
 	radeon_cs_parser_fini(&parser, r);
 	mutex_unlock(&rdev->cs_mutex);
 	return r;
 }

 int radeon_cs_finish_pages(struct radeon_cs_parser *p)
 {
 	struct radeon_cs_chunk *ibc = &p->chunks[p->chunk_ib_idx];
 	int i;
 	int size = PAGE_SIZE;

 	for (i = ibc->last_copied_page + 1; i <= ibc->last_page_index; i++) {
 		if (i == ibc->last_page_index) {
 			size = (ibc->length_dw * 4) % PAGE_SIZE;
 			if (size == 0)
 				size = PAGE_SIZE;
 		}

 		if (DRM_COPY_FROM_USER(p->ib->ptr + (i * (PAGE_SIZE/4)),
 				       ibc->user_ptr + (i * PAGE_SIZE),
 				       size))
 			return -EFAULT;
 	}
 	return 0;
 }

 int radeon_cs_update_pages(struct radeon_cs_parser *p, int pg_idx)
 {
 	int new_page;
 	struct radeon_cs_chunk *ibc = &p->chunks[p->chunk_ib_idx];
 	int i;
 	int size = PAGE_SIZE;

 	for (i = ibc->last_copied_page + 1; i < pg_idx; i++) {
 		if (DRM_COPY_FROM_USER(p->ib->ptr + (i * (PAGE_SIZE/4)),
 				       ibc->user_ptr + (i * PAGE_SIZE),
 				       PAGE_SIZE)) {
 			p->parser_error = -EFAULT;
 			return 0;
 		}
 	}

 	new_page = ibc->kpage_idx[0] < ibc->kpage_idx[1] ? 0 : 1;

 	if (pg_idx == ibc->last_page_index) {
 		size = (ibc->length_dw * 4) % PAGE_SIZE;
 			if (size == 0)
 				size = PAGE_SIZE;
 	}

 	if (DRM_COPY_FROM_USER(ibc->kpage[new_page],
 			       ibc->user_ptr + (pg_idx * PAGE_SIZE),
 			       size)) {
 		p->parser_error = -EFAULT;
 		return 0;
 	}

 	/* copy to IB here */
 	memcpy((void *)(p->ib->ptr+(pg_idx*(PAGE_SIZE/4))), ibc->kpage[new_page], size);

 	ibc->last_copied_page = pg_idx;
 	ibc->kpage_idx[new_page] = pg_idx;

 	return new_page;
 }
	/*
	* Copyright 2008 Jerome Glisse.
	* 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
	* PRECISION INSIGHT 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:
	* Jerome Glisse <glisse@freedesktop.org>
	*/
	#include "drmP.h"
	#include "radeon_drm.h"
	#include "radeon_reg.h"
	#include "radeon.h"

	void r100_cs_dump_packet(struct radeon_cs_parser *p,
	struct radeon_cs_packet *pkt);

	int radeon_cs_parser_relocs(struct radeon_cs_parser *p)
	{
	struct drm_device *ddev = p->rdev->ddev;
	struct radeon_cs_chunk *chunk;
	unsigned i, j;
	bool duplicate;

	if (p->chunk_relocs_idx == -1) {
	return 0;
	}
	chunk = &p->chunks[p->chunk_relocs_idx];
	/* FIXME: we assume that each relocs use 4 dwords */
	p->nrelocs = chunk->length_dw / 4;
	p->relocs_ptr = kcalloc(p->nrelocs, sizeof(void *), GFP_KERNEL);
	if (p->relocs_ptr == NULL) {
	return -ENOMEM;
	}
	p->relocs = kcalloc(p->nrelocs, sizeof(struct radeon_cs_reloc), GFP_KERNEL);
	if (p->relocs == NULL) {
	return -ENOMEM;
	}
	for (i = 0; i < p->nrelocs; i++) {
	struct drm_radeon_cs_reloc *r;

	duplicate = false;
	r = (struct drm_radeon_cs_reloc )&chunk->kdata[i4];
	for (j = 0; j < p->nrelocs; j++) {
	if (r->handle == p->relocs[j].handle) {
	p->relocs_ptr[i] = &p->relocs[j];
	duplicate = true;
	break;
	}
	}
	if (!duplicate) {
	p->relocs[i].gobj = drm_gem_object_lookup(ddev,
	p->filp,
	r->handle);
	if (p->relocs[i].gobj == NULL) {
	DRM_ERROR("gem object lookup failed 0x%x\n",
	r->handle);
	return -EINVAL;
	}
	p->relocs_ptr[i] = &p->relocs[i];
	p->relocs[i].robj = p->relocs[i].gobj->driver_private;
	p->relocs[i].lobj.bo = p->relocs[i].robj;
	p->relocs[i].lobj.rdomain = r->read_domains;
	p->relocs[i].lobj.wdomain = r->write_domain;
	p->relocs[i].handle = r->handle;
	p->relocs[i].flags = r->flags;
	INIT_LIST_HEAD(&p->relocs[i].lobj.list);
	radeon_bo_list_add_object(&p->relocs[i].lobj,
	&p->validated);
	}
	}
	return radeon_bo_list_validate(&p->validated);
	}

	int radeon_cs_parser_init(struct radeon_cs_parser p, void data)
	{
	struct drm_radeon_cs *cs = data;
	uint64_t *chunk_array_ptr;
	unsigned size, i;

	if (!cs->num_chunks) {
	return 0;
	}
	/* get chunks */
	INIT_LIST_HEAD(&p->validated);
	p->idx = 0;
	p->chunk_ib_idx = -1;
	p->chunk_relocs_idx = -1;
	p->chunks_array = kcalloc(cs->num_chunks, sizeof(uint64_t), GFP_KERNEL);
	if (p->chunks_array == NULL) {
	return -ENOMEM;
	}
	chunk_array_ptr = (uint64_t *)(unsigned long)(cs->chunks);
	if (DRM_COPY_FROM_USER(p->chunks_array, chunk_array_ptr,
	sizeof(uint64_t)*cs->num_chunks)) {
	return -EFAULT;
	}
	p->nchunks = cs->num_chunks;
	p->chunks = kcalloc(p->nchunks, sizeof(struct radeon_cs_chunk), GFP_KERNEL);
	if (p->chunks == NULL) {
	return -ENOMEM;
	}
	for (i = 0; i < p->nchunks; i++) {
	struct drm_radeon_cs_chunk __user **chunk_ptr = NULL;
	struct drm_radeon_cs_chunk user_chunk;
	uint32_t __user *cdata;

	chunk_ptr = (void __user*)(unsigned long)p->chunks_array[i];
	if (DRM_COPY_FROM_USER(&user_chunk, chunk_ptr,
	sizeof(struct drm_radeon_cs_chunk))) {
	return -EFAULT;
	}
	p->chunks[i].length_dw = user_chunk.length_dw;
	p->chunks[i].kdata = NULL;
	p->chunks[i].chunk_id = user_chunk.chunk_id;

	if (p->chunks[i].chunk_id == RADEON_CHUNK_ID_RELOCS) {
	p->chunk_relocs_idx = i;
	}
	if (p->chunks[i].chunk_id == RADEON_CHUNK_ID_IB) {
	p->chunk_ib_idx = i;
	/* zero length IB isn't useful */
	if (p->chunks[i].length_dw == 0)
	return -EINVAL;
	}

	p->chunks[i].length_dw = user_chunk.length_dw;
	p->chunks[i].user_ptr = (void __user *)(unsigned long)user_chunk.chunk_data;

	cdata = (uint32_t *)(unsigned long)user_chunk.chunk_data;
	if (p->chunks[i].chunk_id != RADEON_CHUNK_ID_IB) {
	size = p->chunks[i].length_dw * sizeof(uint32_t);
	p->chunks[i].kdata = kmalloc(size, GFP_KERNEL);
	if (p->chunks[i].kdata == NULL) {
	return -ENOMEM;
	}
	if (DRM_COPY_FROM_USER(p->chunks[i].kdata,
	p->chunks[i].user_ptr, size)) {
	return -EFAULT;
	}
	} else {
	p->chunks[i].kpage[0] = kmalloc(PAGE_SIZE, GFP_KERNEL);
	p->chunks[i].kpage[1] = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (p->chunks[i].kpage[0] == NULL \|\| p->chunks[i].kpage[1] == NULL) {
	kfree(p->chunks[i].kpage[0]);
	kfree(p->chunks[i].kpage[1]);
	return -ENOMEM;
	}
	p->chunks[i].kpage_idx[0] = -1;
	p->chunks[i].kpage_idx[1] = -1;
	p->chunks[i].last_copied_page = -1;
	p->chunks[i].last_page_index = ((p->chunks[i].length_dw * 4) - 1) / PAGE_SIZE;
	}
	}
	if (p->chunks[p->chunk_ib_idx].length_dw > (16 * 1024)) {
	DRM_ERROR("cs IB too big: %d\n",
	p->chunks[p->chunk_ib_idx].length_dw);
	return -EINVAL;
	}
	return 0;
	}

	/**
	* cs_parser_fini() - clean parser states
	* @parser: parser structure holding parsing context.
	* @error: error number
	*
	* If error is set than unvalidate buffer, otherwise just free memory
	* used by parsing context.
	**/
	static void radeon_cs_parser_fini(struct radeon_cs_parser *parser, int error)
	{
	unsigned i;

	if (!error && parser->ib) {
	radeon_bo_list_fence(&parser->validated, parser->ib->fence);
	}
	radeon_bo_list_unreserve(&parser->validated);
	if (parser->relocs != NULL) {
	for (i = 0; i < parser->nrelocs; i++) {
	if (parser->relocs[i].gobj)
	drm_gem_object_unreference_unlocked(parser->relocs[i].gobj);
	}
	}
	kfree(parser->track);
	kfree(parser->relocs);
	kfree(parser->relocs_ptr);
	for (i = 0; i < parser->nchunks; i++) {
	kfree(parser->chunks[i].kdata);
	kfree(parser->chunks[i].kpage[0]);
	kfree(parser->chunks[i].kpage[1]);
	}
	kfree(parser->chunks);
	kfree(parser->chunks_array);
	radeon_ib_free(parser->rdev, &parser->ib);
	}

	int radeon_cs_ioctl(struct drm_device dev, void data, struct drm_file *filp)
	{
	struct radeon_device *rdev = dev->dev_private;
	struct radeon_cs_parser parser;
	struct radeon_cs_chunk *ib_chunk;
	int r;

	mutex_lock(&rdev->cs_mutex);
	if (rdev->gpu_lockup) {
	mutex_unlock(&rdev->cs_mutex);
	return -EINVAL;
	}
	/* initialize parser */
	memset(&parser, 0, sizeof(struct radeon_cs_parser));
	parser.filp = filp;
	parser.rdev = rdev;
	parser.dev = rdev->dev;
	r = radeon_cs_parser_init(&parser, data);
	if (r) {
	DRM_ERROR("Failed to initialize parser !\n");
	radeon_cs_parser_fini(&parser, r);
	mutex_unlock(&rdev->cs_mutex);
	return r;
	}
	r = radeon_ib_get(rdev, &parser.ib);
	if (r) {
	DRM_ERROR("Failed to get ib !\n");
	radeon_cs_parser_fini(&parser, r);
	mutex_unlock(&rdev->cs_mutex);
	return r;
	}
	r = radeon_cs_parser_relocs(&parser);
	if (r) {
	if (r != -ERESTARTSYS)
	DRM_ERROR("Failed to parse relocation %d!\n", r);
	radeon_cs_parser_fini(&parser, r);
	mutex_unlock(&rdev->cs_mutex);
	return r;
	}
	/* Copy the packet into the IB, the parser will read from the
	* input memory (cached) and write to the IB (which can be
	* uncached). */
	ib_chunk = &parser.chunks[parser.chunk_ib_idx];
	parser.ib->length_dw = ib_chunk->length_dw;
	r = radeon_cs_parse(&parser);
	if (r \|\| parser.parser_error) {
	DRM_ERROR("Invalid command stream !\n");
	radeon_cs_parser_fini(&parser, r);
	mutex_unlock(&rdev->cs_mutex);
	return r;
	}
	r = radeon_cs_finish_pages(&parser);
	if (r) {
	DRM_ERROR("Invalid command stream !\n");
	radeon_cs_parser_fini(&parser, r);
	mutex_unlock(&rdev->cs_mutex);
	return r;
	}
	r = radeon_ib_schedule(rdev, parser.ib);
	if (r) {
	DRM_ERROR("Faild to schedule IB !\n");
	}
	radeon_cs_parser_fini(&parser, r);
	mutex_unlock(&rdev->cs_mutex);
	return r;
	}

	int radeon_cs_finish_pages(struct radeon_cs_parser *p)
	{
	struct radeon_cs_chunk *ibc = &p->chunks[p->chunk_ib_idx];
	int i;
	int size = PAGE_SIZE;

	for (i = ibc->last_copied_page + 1; i <= ibc->last_page_index; i++) {
	if (i == ibc->last_page_index) {
	size = (ibc->length_dw * 4) % PAGE_SIZE;
	if (size == 0)
	size = PAGE_SIZE;
	}

	if (DRM_COPY_FROM_USER(p->ib->ptr + (i * (PAGE_SIZE/4)),
	ibc->user_ptr + (i * PAGE_SIZE),
	size))
	return -EFAULT;
	}
	return 0;
	}

	int radeon_cs_update_pages(struct radeon_cs_parser *p, int pg_idx)
	{
	int new_page;
	struct radeon_cs_chunk *ibc = &p->chunks[p->chunk_ib_idx];
	int i;
	int size = PAGE_SIZE;

	for (i = ibc->last_copied_page + 1; i < pg_idx; i++) {
	if (DRM_COPY_FROM_USER(p->ib->ptr + (i * (PAGE_SIZE/4)),
	ibc->user_ptr + (i * PAGE_SIZE),
	PAGE_SIZE)) {
	p->parser_error = -EFAULT;
	return 0;
	}
	}

	new_page = ibc->kpage_idx[0] < ibc->kpage_idx[1] ? 0 : 1;

	if (pg_idx == ibc->last_page_index) {
	size = (ibc->length_dw * 4) % PAGE_SIZE;
	if (size == 0)
	size = PAGE_SIZE;
	}

	if (DRM_COPY_FROM_USER(ibc->kpage[new_page],
	ibc->user_ptr + (pg_idx * PAGE_SIZE),
	size)) {
	p->parser_error = -EFAULT;
	return 0;
	}

	/* copy to IB here */
	memcpy((void )(p->ib->ptr+(pg_idx(PAGE_SIZE/4))), ibc->kpage[new_page], size);

	ibc->last_copied_page = pg_idx;
	ibc->kpage_idx[new_page] = pg_idx;

	return new_page;
	}