1 files changed, 658 insertions, 0 deletions

diff --git a/sys/dev/drm2/radeon/radeon_cs.c b/sys/dev/drm2/radeon/radeon_cs.c
new file mode 100644
index 0000000..ee299fa
--- /dev/null
+++ b/sys/dev/drm2/radeon/radeon_cs.c
@@ -0,0 +1,658 @@
+/*
+ * 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 <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <dev/drm2/drmP.h>
+#include <dev/drm2/radeon/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);
+
+static 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];
+	p->dma_reloc_idx = 0;
+	/* FIXME: we assume that each relocs use 4 dwords */
+	p->nrelocs = chunk->length_dw / 4;
+	p->relocs_ptr = malloc(p->nrelocs * sizeof(void *),
+	    DRM_MEM_DRIVER, M_ZERO | M_WAITOK);
+	if (p->relocs_ptr == NULL) {
+		return -ENOMEM;
+	}
+	p->relocs = malloc(p->nrelocs * sizeof(struct radeon_cs_reloc),
+	    DRM_MEM_DRIVER, M_ZERO | M_WAITOK);
+	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 < i; 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 -ENOENT;
+			}
+			p->relocs_ptr[i] = &p->relocs[i];
+			p->relocs[i].robj = gem_to_radeon_bo(p->relocs[i].gobj);
+			p->relocs[i].lobj.bo = p->relocs[i].robj;
+			p->relocs[i].lobj.wdomain = r->write_domain;
+			p->relocs[i].lobj.rdomain = r->read_domains;
+			p->relocs[i].lobj.tv.bo = &p->relocs[i].robj->tbo;
+			p->relocs[i].handle = r->handle;
+			p->relocs[i].flags = r->flags;
+			radeon_bo_list_add_object(&p->relocs[i].lobj,
+						  &p->validated);
+
+		} else
+			p->relocs[i].handle = 0;
+	}
+	return radeon_bo_list_validate(&p->validated);
+}
+
+static int radeon_cs_get_ring(struct radeon_cs_parser *p, u32 ring, s32 priority)
+{
+	p->priority = priority;
+
+	switch (ring) {
+	default:
+		DRM_ERROR("unknown ring id: %d\n", ring);
+		return -EINVAL;
+	case RADEON_CS_RING_GFX:
+		p->ring = RADEON_RING_TYPE_GFX_INDEX;
+		break;
+	case RADEON_CS_RING_COMPUTE:
+		if (p->rdev->family >= CHIP_TAHITI) {
+			if (p->priority > 0)
+				p->ring = CAYMAN_RING_TYPE_CP1_INDEX;
+			else
+				p->ring = CAYMAN_RING_TYPE_CP2_INDEX;
+		} else
+			p->ring = RADEON_RING_TYPE_GFX_INDEX;
+		break;
+	case RADEON_CS_RING_DMA:
+		if (p->rdev->family >= CHIP_CAYMAN) {
+			if (p->priority > 0)
+				p->ring = R600_RING_TYPE_DMA_INDEX;
+			else
+				p->ring = CAYMAN_RING_TYPE_DMA1_INDEX;
+		} else if (p->rdev->family >= CHIP_R600) {
+			p->ring = R600_RING_TYPE_DMA_INDEX;
+		} else {
+			return -EINVAL;
+		}
+		break;
+	}
+	return 0;
+}
+
+static void radeon_cs_sync_to(struct radeon_cs_parser *p,
+			      struct radeon_fence *fence)
+{
+	struct radeon_fence *other;
+
+	if (!fence)
+		return;
+
+	other = p->ib.sync_to[fence->ring];
+	p->ib.sync_to[fence->ring] = radeon_fence_later(fence, other);
+}
+
+static void radeon_cs_sync_rings(struct radeon_cs_parser *p)
+{
+	int i;
+
+	for (i = 0; i < p->nrelocs; i++) {
+		if (!p->relocs[i].robj)
+			continue;
+
+		radeon_cs_sync_to(p, p->relocs[i].robj->tbo.sync_obj);
+	}
+}
+
+/* XXX: note that this is called from the legacy UMS CS ioctl as well */
+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;
+	u32 ring = RADEON_CS_RING_GFX;
+	s32 priority = 0;
+
+	if (!cs->num_chunks) {
+		return 0;
+	}
+	/* get chunks */
+	INIT_LIST_HEAD(&p->validated);
+	p->idx = 0;
+	p->ib.sa_bo = NULL;
+	p->ib.semaphore = NULL;
+	p->const_ib.sa_bo = NULL;
+	p->const_ib.semaphore = NULL;
+	p->chunk_ib_idx = -1;
+	p->chunk_relocs_idx = -1;
+	p->chunk_flags_idx = -1;
+	p->chunk_const_ib_idx = -1;
+	p->chunks_array = malloc(cs->num_chunks * sizeof(uint64_t),
+	    DRM_MEM_DRIVER, M_ZERO | M_WAITOK);
+	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->cs_flags = 0;
+	p->nchunks = cs->num_chunks;
+	p->chunks = malloc(p->nchunks * sizeof(struct radeon_cs_chunk),
+	    DRM_MEM_DRIVER, M_ZERO | M_WAITOK);
+	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;
+		}
+		if (p->chunks[i].chunk_id == RADEON_CHUNK_ID_CONST_IB) {
+			p->chunk_const_ib_idx = i;
+			/* zero length CONST IB isn't useful */
+			if (p->chunks[i].length_dw == 0)
+				return -EINVAL;
+		}
+		if (p->chunks[i].chunk_id == RADEON_CHUNK_ID_FLAGS) {
+			p->chunk_flags_idx = i;
+			/* zero length flags aren'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_RELOCS) ||
+		    (p->chunks[i].chunk_id == RADEON_CHUNK_ID_FLAGS)) {
+			size = p->chunks[i].length_dw * sizeof(uint32_t);
+			p->chunks[i].kdata = malloc(size, DRM_MEM_DRIVER, M_WAITOK);
+			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;
+			}
+			if (p->chunks[i].chunk_id == RADEON_CHUNK_ID_FLAGS) {
+				p->cs_flags = p->chunks[i].kdata[0];
+				if (p->chunks[i].length_dw > 1)
+					ring = p->chunks[i].kdata[1];
+				if (p->chunks[i].length_dw > 2)
+					priority = (s32)p->chunks[i].kdata[2];
+			}
+		}
+	}
+
+	/* these are KMS only */
+	if (p->rdev) {
+		if ((p->cs_flags & RADEON_CS_USE_VM) &&
+		    !p->rdev->vm_manager.enabled) {
+			DRM_ERROR("VM not active on asic!\n");
+			return -EINVAL;
+		}
+
+		/* we only support VM on SI+ */
+		if ((p->rdev->family >= CHIP_TAHITI) &&
+		    ((p->cs_flags & RADEON_CS_USE_VM) == 0)) {
+			DRM_ERROR("VM required on SI+!\n");
+			return -EINVAL;
+		}
+
+		if (radeon_cs_get_ring(p, ring, priority))
+			return -EINVAL;
+	}
+
+	/* deal with non-vm */
+	if ((p->chunk_ib_idx != -1) &&
+	    ((p->cs_flags & RADEON_CS_USE_VM) == 0) &&
+	    (p->chunks[p->chunk_ib_idx].chunk_id == RADEON_CHUNK_ID_IB)) {
+		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;
+		}
+		if (p->rdev && (p->rdev->flags & RADEON_IS_AGP)) {
+			p->chunks[p->chunk_ib_idx].kpage[0] = malloc(PAGE_SIZE, DRM_MEM_DRIVER, M_WAITOK);
+			p->chunks[p->chunk_ib_idx].kpage[1] = malloc(PAGE_SIZE, DRM_MEM_DRIVER, M_WAITOK);
+			if (p->chunks[p->chunk_ib_idx].kpage[0] == NULL ||
+			    p->chunks[p->chunk_ib_idx].kpage[1] == NULL) {
+				free(p->chunks[p->chunk_ib_idx].kpage[0], DRM_MEM_DRIVER);
+				free(p->chunks[p->chunk_ib_idx].kpage[1], DRM_MEM_DRIVER);
+				p->chunks[p->chunk_ib_idx].kpage[0] = NULL;
+				p->chunks[p->chunk_ib_idx].kpage[1] = NULL;
+				return -ENOMEM;
+			}
+		}
+		p->chunks[p->chunk_ib_idx].kpage_idx[0] = -1;
+		p->chunks[p->chunk_ib_idx].kpage_idx[1] = -1;
+		p->chunks[p->chunk_ib_idx].last_copied_page = -1;
+		p->chunks[p->chunk_ib_idx].last_page_index =
+			((p->chunks[p->chunk_ib_idx].length_dw * 4) - 1) / PAGE_SIZE;
+	}
+
+	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) {
+		ttm_eu_fence_buffer_objects(&parser->validated,
+					    parser->ib.fence);
+	} else {
+		ttm_eu_backoff_reservation(&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);
+		}
+	}
+	free(parser->track, DRM_MEM_DRIVER);
+	free(parser->relocs, DRM_MEM_DRIVER);
+	free(parser->relocs_ptr, DRM_MEM_DRIVER);
+	for (i = 0; i < parser->nchunks; i++) {
+		free(parser->chunks[i].kdata, DRM_MEM_DRIVER);
+		if ((parser->rdev->flags & RADEON_IS_AGP)) {
+			free(parser->chunks[i].kpage[0], DRM_MEM_DRIVER);
+			free(parser->chunks[i].kpage[1], DRM_MEM_DRIVER);
+		}
+	}
+	free(parser->chunks, DRM_MEM_DRIVER);
+	free(parser->chunks_array, DRM_MEM_DRIVER);
+	radeon_ib_free(parser->rdev, &parser->ib);
+	radeon_ib_free(parser->rdev, &parser->const_ib);
+}
+
+static int radeon_cs_ib_chunk(struct radeon_device *rdev,
+			      struct radeon_cs_parser *parser)
+{
+	struct radeon_cs_chunk *ib_chunk;
+	int r;
+
+	if (parser->chunk_ib_idx == -1)
+		return 0;
+
+	if (parser->cs_flags & RADEON_CS_USE_VM)
+		return 0;
+
+	ib_chunk = &parser->chunks[parser->chunk_ib_idx];
+	/* Copy the packet into the IB, the parser will read from the
+	 * input memory (cached) and write to the IB (which can be
+	 * uncached).
+	 */
+	r =  radeon_ib_get(rdev, parser->ring, &parser->ib,
+			   NULL, ib_chunk->length_dw * 4);
+	if (r) {
+		DRM_ERROR("Failed to get ib !\n");
+		return r;
+	}
+	parser->ib.length_dw = ib_chunk->length_dw;
+	r = radeon_cs_parse(rdev, parser->ring, parser);
+	if (r || parser->parser_error) {
+		DRM_ERROR("Invalid command stream !\n");
+		return r;
+	}
+	r = radeon_cs_finish_pages(parser);
+	if (r) {
+		DRM_ERROR("Invalid command stream !\n");
+		return r;
+	}
+	radeon_cs_sync_rings(parser);
+	r = radeon_ib_schedule(rdev, &parser->ib, NULL);
+	if (r) {
+		DRM_ERROR("Failed to schedule IB !\n");
+	}
+	return r;
+}
+
+static int radeon_bo_vm_update_pte(struct radeon_cs_parser *parser,
+				   struct radeon_vm *vm)
+{
+	struct radeon_device *rdev = parser->rdev;
+	struct radeon_bo_list *lobj;
+	struct radeon_bo *bo;
+	int r;
+
+	r = radeon_vm_bo_update_pte(rdev, vm, rdev->ring_tmp_bo.bo, &rdev->ring_tmp_bo.bo->tbo.mem);
+	if (r) {
+		return r;
+	}
+	list_for_each_entry(lobj, &parser->validated, tv.head) {
+		bo = lobj->bo;
+		r = radeon_vm_bo_update_pte(parser->rdev, vm, bo, &bo->tbo.mem);
+		if (r) {
+			return r;
+		}
+	}
+	return 0;
+}
+
+static int radeon_cs_ib_vm_chunk(struct radeon_device *rdev,
+				 struct radeon_cs_parser *parser)
+{
+	struct radeon_cs_chunk *ib_chunk;
+	struct radeon_fpriv *fpriv = parser->filp->driver_priv;
+	struct radeon_vm *vm = &fpriv->vm;
+	int r;
+
+	if (parser->chunk_ib_idx == -1)
+		return 0;
+	if ((parser->cs_flags & RADEON_CS_USE_VM) == 0)
+		return 0;
+
+	if ((rdev->family >= CHIP_TAHITI) &&
+	    (parser->chunk_const_ib_idx != -1)) {
+		ib_chunk = &parser->chunks[parser->chunk_const_ib_idx];
+		if (ib_chunk->length_dw > RADEON_IB_VM_MAX_SIZE) {
+			DRM_ERROR("cs IB CONST too big: %d\n", ib_chunk->length_dw);
+			return -EINVAL;
+		}
+		r =  radeon_ib_get(rdev, parser->ring, &parser->const_ib,
+				   vm, ib_chunk->length_dw * 4);
+		if (r) {
+			DRM_ERROR("Failed to get const ib !\n");
+			return r;
+		}
+		parser->const_ib.is_const_ib = true;
+		parser->const_ib.length_dw = ib_chunk->length_dw;
+		/* Copy the packet into the IB */
+		if (DRM_COPY_FROM_USER(parser->const_ib.ptr, ib_chunk->user_ptr,
+				       ib_chunk->length_dw * 4)) {
+			return -EFAULT;
+		}
+		r = radeon_ring_ib_parse(rdev, parser->ring, &parser->const_ib);
+		if (r) {
+			return r;
+		}
+	}
+
+	ib_chunk = &parser->chunks[parser->chunk_ib_idx];
+	if (ib_chunk->length_dw > RADEON_IB_VM_MAX_SIZE) {
+		DRM_ERROR("cs IB too big: %d\n", ib_chunk->length_dw);
+		return -EINVAL;
+	}
+	r =  radeon_ib_get(rdev, parser->ring, &parser->ib,
+			   vm, ib_chunk->length_dw * 4);
+	if (r) {
+		DRM_ERROR("Failed to get ib !\n");
+		return r;
+	}
+	parser->ib.length_dw = ib_chunk->length_dw;
+	/* Copy the packet into the IB */
+	if (DRM_COPY_FROM_USER(parser->ib.ptr, ib_chunk->user_ptr,
+			       ib_chunk->length_dw * 4)) {
+		return -EFAULT;
+	}
+	r = radeon_ring_ib_parse(rdev, parser->ring, &parser->ib);
+	if (r) {
+		return r;
+	}
+
+	sx_xlock(&rdev->vm_manager.lock);
+	sx_xlock(&vm->mutex);
+	r = radeon_vm_alloc_pt(rdev, vm);
+	if (r) {
+		goto out;
+	}
+	r = radeon_bo_vm_update_pte(parser, vm);
+	if (r) {
+		goto out;
+	}
+	radeon_cs_sync_rings(parser);
+	radeon_cs_sync_to(parser, vm->fence);
+	radeon_cs_sync_to(parser, radeon_vm_grab_id(rdev, vm, parser->ring));
+
+	if ((rdev->family >= CHIP_TAHITI) &&
+	    (parser->chunk_const_ib_idx != -1)) {
+		r = radeon_ib_schedule(rdev, &parser->ib, &parser->const_ib);
+	} else {
+		r = radeon_ib_schedule(rdev, &parser->ib, NULL);
+	}
+
+	if (!r) {
+		radeon_vm_fence(rdev, vm, parser->ib.fence);
+	}
+
+out:
+	radeon_vm_add_to_lru(rdev, vm);
+	sx_xunlock(&vm->mutex);
+	sx_xunlock(&rdev->vm_manager.lock);
+	return r;
+}
+
+static int radeon_cs_handle_lockup(struct radeon_device *rdev, int r)
+{
+	if (r == -EDEADLK) {
+		r = radeon_gpu_reset(rdev);
+		if (!r)
+			r = -EAGAIN;
+	}
+	return r;
+}
+
+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;
+	int r;
+
+	sx_slock(&rdev->exclusive_lock);
+	if (!rdev->accel_working) {
+		sx_sunlock(&rdev->exclusive_lock);
+		return -EBUSY;
+	}
+	/* initialize parser */
+	memset(&parser, 0, sizeof(struct radeon_cs_parser));
+	parser.filp = filp;
+	parser.rdev = rdev;
+	parser.dev = rdev->dev;
+	parser.family = rdev->family;
+	r = radeon_cs_parser_init(&parser, data);
+	if (r) {
+		DRM_ERROR("Failed to initialize parser !\n");
+		radeon_cs_parser_fini(&parser, r);
+		sx_sunlock(&rdev->exclusive_lock);
+		r = radeon_cs_handle_lockup(rdev, r);
+		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);
+		sx_sunlock(&rdev->exclusive_lock);
+		r = radeon_cs_handle_lockup(rdev, r);
+		return r;
+	}
+	r = radeon_cs_ib_chunk(rdev, &parser);
+	if (r) {
+		goto out;
+	}
+	r = radeon_cs_ib_vm_chunk(rdev, &parser);
+	if (r) {
+		goto out;
+	}
+out:
+	radeon_cs_parser_fini(&parser, r);
+	sx_sunlock(&rdev->exclusive_lock);
+	r = radeon_cs_handle_lockup(rdev, r);
+	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)),
+				       (char *)ibc->user_ptr + (i * PAGE_SIZE),
+				       size))
+			return -EFAULT;
+	}
+	return 0;
+}
+
+static 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;
+	bool copy1 = (p->rdev && (p->rdev->flags & RADEON_IS_AGP)) ?
+		false : true;
+
+	for (i = ibc->last_copied_page + 1; i < pg_idx; i++) {
+		if (DRM_COPY_FROM_USER(p->ib.ptr + (i * (PAGE_SIZE/4)),
+				       (char *)ibc->user_ptr + (i * PAGE_SIZE),
+				       PAGE_SIZE)) {
+			p->parser_error = -EFAULT;
+			return 0;
+		}
+	}
+
+	if (pg_idx == ibc->last_page_index) {
+		size = (ibc->length_dw * 4) % PAGE_SIZE;
+		if (size == 0)
+			size = PAGE_SIZE;
+	}
+
+	new_page = ibc->kpage_idx[0] < ibc->kpage_idx[1] ? 0 : 1;
+	if (copy1)
+		ibc->kpage[new_page] = p->ib.ptr + (pg_idx * (PAGE_SIZE / 4));
+
+	if (DRM_COPY_FROM_USER(ibc->kpage[new_page],
+			       (char *)ibc->user_ptr + (pg_idx * PAGE_SIZE),
+			       size)) {
+		p->parser_error = -EFAULT;
+		return 0;
+	}
+
+	/* copy to IB for non single case */
+	if (!copy1)
+		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;
+}
+
+u32 radeon_get_ib_value(struct radeon_cs_parser *p, int idx)
+{
+	struct radeon_cs_chunk *ibc = &p->chunks[p->chunk_ib_idx];
+	u32 pg_idx, pg_offset;
+	u32 idx_value = 0;
+	int new_page;
+
+	pg_idx = (idx * 4) / PAGE_SIZE;
+	pg_offset = (idx * 4) % PAGE_SIZE;
+
+	if (ibc->kpage_idx[0] == pg_idx)
+		return ibc->kpage[0][pg_offset/4];
+	if (ibc->kpage_idx[1] == pg_idx)
+		return ibc->kpage[1][pg_offset/4];
+
+	new_page = radeon_cs_update_pages(p, pg_idx);
+	if (new_page < 0) {
+		p->parser_error = new_page;
+		return 0;
+	}
+
+	idx_value = ibc->kpage[new_page][pg_offset/4];
+	return idx_value;
+}