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Working revision.

main
Thomas Hellstrom 2008-02-29 15:38:55 +01:00
parent 2305100c0f
commit 612c22f131
2 changed files with 142 additions and 100 deletions
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228
linux-core/i915_execbuf.c
View File

@ -1,5 +1,5 @@
/*
* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
* Copyright 2003-2008 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
@ -22,6 +22,10 @@
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Authors:
* Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
* Dave Airlie
* ?
*/
#include "drmP.h"
@ -48,8 +52,9 @@ struct i915_relocatee_info {
unsigned page_offset;
struct drm_bo_kmap_obj kmap;
int is_iomem;
int dst;
int dst;
int idle;
int performed_ring_relocs;
#ifdef DRM_KMAP_ATOMIC_PROT_PFN
unsigned long pfn;
pgprot_t pg_prot;
@ -65,13 +70,20 @@ struct drm_i915_validate_buffer {
enum i915_buf_idle idle;
};
/*
* I'd like to use MI_STORE_DATA_IMM here, but I can't make
* it work. Seems like GART writes are broken with that
* instruction. Also I'm not sure that MI_FLUSH will
* act as a memory barrier for that instruction. It will
* for this single dword 2D blit.
*/
static void i915_emit_ring_reloc(struct drm_device *dev, uint32_t offset,
uint32_t value)
{
struct drm_i915_private *dev_priv =
(struct drm_i915_private *) dev->dev_private;
(struct drm_i915_private *)dev->dev_private;
DRM_INFO("Ring reloc.\n");
RING_LOCALS;
i915_kernel_lost_context(dev);
BEGIN_LP_RING(6);
@ -84,8 +96,8 @@ static void i915_emit_ring_reloc(struct drm_device *dev, uint32_t offset,
ADVANCE_LP_RING();
}
static void i915_dereference_buffers_locked(struct drm_i915_validate_buffer *buffers,
unsigned num_buffers)
static void i915_dereference_buffers_locked(struct drm_i915_validate_buffer
*buffers, unsigned num_buffers)
{
while (num_buffers--)
drm_bo_usage_deref_locked(&buffers[num_buffers].buffer);
@ -93,8 +105,7 @@ static void i915_dereference_buffers_locked(struct drm_i915_validate_buffer *buf
int i915_apply_reloc(struct drm_file *file_priv, int num_buffers,
struct drm_i915_validate_buffer *buffers,
struct i915_relocatee_info *relocatee,
uint32_t *reloc)
struct i915_relocatee_info *relocatee, uint32_t * reloc)
{
unsigned index;
unsigned long new_cmd_offset;
@ -130,18 +141,19 @@ int i915_apply_reloc(struct drm_file *file_priv, int num_buffers,
relocatee->data_page = NULL;
relocatee->offset = new_cmd_offset;
/*
* Note on buffer idle:
* Since we're applying relocations, this part of the
* buffer is obviously not used by the GPU and we don't
* need to wait for buffer idle. This is an important
* consideration for user-space buffer pools.
*/
if (unlikely(relocatee->idle == i915_reloc_unchecked)) {
ret = drm_bo_wait(relocatee->buf, 0, 0, 0);
if (ret)
return ret;
relocatee->idle = i915_reloc_idle;
}
ret = drm_bo_kmap(relocatee->buf, new_cmd_offset >> PAGE_SHIFT,
1, &relocatee->kmap);
if (ret) {
DRM_ERROR("Could not map command buffer to apply relocs\n %08lx", new_cmd_offset);
DRM_ERROR
("Could not map command buffer to apply relocs\n %08lx",
new_cmd_offset);
return ret;
}
relocatee->data_page = drm_bmo_virtual(&relocatee->kmap,
@ -158,8 +170,10 @@ int i915_apply_reloc(struct drm_file *file_priv, int num_buffers,
if (DRM_DEBUG_RELOCATION) {
if (buffers[buf_index].presumed_offset_correct &&
relocatee->data_page[index] != val) {
DRM_DEBUG ("Relocation mismatch source %d target %d buffer %d user %08x kernel %08x\n",
reloc[0], reloc[1], buf_index, relocatee->data_page[index], val);
DRM_DEBUG
("Relocation mismatch source %d target %d buffer %d user %08x kernel %08x\n",
reloc[0], reloc[1], buf_index,
relocatee->data_page[index], val);
}
}
@ -172,7 +186,7 @@ int i915_apply_reloc(struct drm_file *file_priv, int num_buffers,
int i915_process_relocs(struct drm_file *file_priv,
uint32_t buf_handle,
uint32_t __user **reloc_user_ptr,
uint32_t __user ** reloc_user_ptr,
struct i915_relocatee_info *relocatee,
struct drm_i915_validate_buffer *buffers,
uint32_t num_buffers)
@ -192,7 +206,7 @@ int i915_process_relocs(struct drm_file *file_priv,
goto out;
}
ret = get_user(reloc_type, (*reloc_user_ptr)+1);
ret = get_user(reloc_type, (*reloc_user_ptr) + 1);
if (ret) {
DRM_ERROR("Could not map relocation buffer.\n");
goto out;
@ -204,7 +218,9 @@ int i915_process_relocs(struct drm_file *file_priv,
goto out;
}
reloc_buf_size = (I915_RELOC_HEADER + (reloc_count * I915_RELOC0_STRIDE)) * sizeof(uint32_t);
reloc_buf_size =
(I915_RELOC_HEADER +
(reloc_count * I915_RELOC0_STRIDE)) * sizeof(uint32_t);
reloc_buf = kmalloc(reloc_buf_size, GFP_KERNEL);
if (!reloc_buf) {
DRM_ERROR("Out of memory for reloc buffer\n");
@ -218,26 +234,27 @@ int i915_process_relocs(struct drm_file *file_priv,
}
/* get next relocate buffer handle */
*reloc_user_ptr = (uint32_t *)*(unsigned long *)&reloc_buf[2];
*reloc_user_ptr = (uint32_t *) * (unsigned long *)&reloc_buf[2];
reloc_stride = I915_RELOC0_STRIDE * sizeof(uint32_t); /* may be different for other types of relocs */
reloc_stride = I915_RELOC0_STRIDE * sizeof(uint32_t); /* may be different for other types of relocs */
DRM_DEBUG("num relocs is %d, next is %p\n", reloc_count, *reloc_user_ptr);
DRM_DEBUG("num relocs is %d, next is %p\n", reloc_count,
*reloc_user_ptr);
for (i = 0; i < reloc_count; i++) {
cur_offset = I915_RELOC_HEADER + (i * I915_RELOC0_STRIDE);
ret = i915_apply_reloc(file_priv, num_buffers, buffers,
relocatee, reloc_buf + cur_offset);
if (ret)
goto out;
}
out:
out:
if (reloc_buf)
kfree(reloc_buf);
if (relocatee->data_page) {
if (relocatee->data_page) {
drm_bo_kunmap(&relocatee->kmap);
relocatee->data_page = NULL;
}
@ -246,7 +263,7 @@ out:
}
static int i915_exec_reloc(struct drm_file *file_priv, drm_handle_t buf_handle,
uint32_t __user *reloc_user_ptr,
uint32_t __user * reloc_user_ptr,
struct drm_i915_validate_buffer *buffers,
uint32_t buf_count)
{
@ -264,12 +281,13 @@ static int i915_exec_reloc(struct drm_file *file_priv, drm_handle_t buf_handle,
for (b = 0; b < buf_count; b++)
if (!buffers[b].presumed_offset_correct)
break;
if (b == buf_count)
return 0;
}
memset(&relocatee, 0, sizeof(relocatee));
relocatee.idle = i915_reloc_unchecked;
mutex_lock(&dev->struct_mutex);
relocatee.buf = drm_lookup_buffer_object(file_priv, buf_handle, 1);
@ -280,23 +298,24 @@ static int i915_exec_reloc(struct drm_file *file_priv, drm_handle_t buf_handle,
goto out_err;
}
mutex_lock (&relocatee.buf->mutex);
mutex_lock(&relocatee.buf->mutex);
while (reloc_user_ptr) {
ret = i915_process_relocs(file_priv, buf_handle, &reloc_user_ptr, &relocatee, buffers, buf_count);
ret =
i915_process_relocs(file_priv, buf_handle, &reloc_user_ptr,
&relocatee, buffers, buf_count);
if (ret) {
DRM_ERROR("process relocs failed\n");
goto out_err1;
}
}
out_err1:
mutex_unlock (&relocatee.buf->mutex);
out_err1:
mutex_unlock(&relocatee.buf->mutex);
drm_bo_usage_deref_unlocked(&relocatee.buf);
out_err:
out_err:
return ret;
}
static void i915_clear_relocatee(struct i915_relocatee_info *relocatee)
{
if (relocatee->data_page) {
@ -311,20 +330,23 @@ static void i915_clear_relocatee(struct i915_relocatee_info *relocatee)
relocatee->dst = ~0;
}
static int i915_update_relocatee(struct i915_relocatee_info *relocatee,
struct drm_i915_validate_buffer *buffers,
unsigned int dst,
unsigned long dst_offset)
unsigned int dst, unsigned long dst_offset)
{
int ret;
if (unlikely(dst != relocatee->dst || NULL == relocatee->buf)) {
i915_clear_relocatee(relocatee);
relocatee->dst = dst;
relocatee->buf = buffers[dst].buffer;
relocatee->idle = i915_reloc_idle; buffers[dst].idle;
#if 0
relocatee->idle = buffers[dst].idle;
/*
* Check for buffer idle. If the buffer is busy, revert to
* ring relocations.
*/
if (relocatee->idle == i915_reloc_unchecked) {
preempt_enable();
ret = mutex_lock_interruptible(&relocatee->buf->mutex);
@ -332,16 +354,20 @@ static int i915_update_relocatee(struct i915_relocatee_info *relocatee,
return -EAGAIN;
ret = drm_bo_wait(relocatee->buf, 0, 0, 1);
relocatee->idle = (ret == 0) ? i915_reloc_idle : i915_reloc_busy;
if (ret == 0)
relocatee->idle = i915_reloc_idle;
else {
relocatee->idle = i915_reloc_busy;
relocatee->performed_ring_relocs = 1;
}
mutex_unlock(&relocatee->buf->mutex);
preempt_disable();
buffers[dst].idle = relocatee->idle;
}
#endif
}
if (relocatee->idle == i915_reloc_busy)
return 0;
return 0;
if (unlikely(dst_offset > relocatee->buf->num_pages * PAGE_SIZE)) {
DRM_ERROR("Relocation destination out of bounds.\n");
@ -355,15 +381,14 @@ static int i915_update_relocatee(struct i915_relocatee_info *relocatee,
relocatee->data_page = NULL;
}
ret = drm_bo_pfn_prot(relocatee->buf, dst_offset,
&relocatee->pfn,
&relocatee->pg_prot);
&relocatee->pfn, &relocatee->pg_prot);
if (ret) {
DRM_ERROR("Can't map relocation destination.\n");
return -EINVAL;
}
relocatee->data_page =
kmap_atomic_prot_pfn(relocatee->pfn, KM_USER0,
relocatee->pg_prot);
kmap_atomic_prot_pfn(relocatee->pfn, KM_USER0,
relocatee->pg_prot);
#else
if (NULL != relocatee->data_page) {
drm_bo_kunmap(&relocatee->kmap);
@ -378,7 +403,7 @@ static int i915_update_relocatee(struct i915_relocatee_info *relocatee,
}
relocatee->data_page = drm_bmo_virtual(&relocatee->kmap,
&relocatee->is_iomem);
&relocatee->is_iomem);
#endif
relocatee->page_offset = dst_offset & PAGE_MASK;
}
@ -407,8 +432,7 @@ static int i915_apply_post_reloc(uint32_t reloc[],
return -EINVAL;
}
ret = i915_update_relocatee(relocatee, buffers, dst_buffer,
reloc[0]);
ret = i915_update_relocatee(relocatee, buffers, dst_buffer, reloc[0]);
if (unlikely(ret))
return ret;
@ -417,12 +441,10 @@ static int i915_apply_post_reloc(uint32_t reloc[],
val = val + reloc[1];
if (relocatee->idle == i915_reloc_busy) {
i915_emit_ring_reloc(relocatee->buf->dev,
relocatee->buf->offset + reloc[0],
val);
i915_emit_ring_reloc(relocatee->buf->dev,
relocatee->buf->offset + reloc[0], val);
return 0;
}
#ifdef DRM_KMAP_ATOMIC_PROT_PFN
relocatee->data_page[index] = val;
#else
@ -436,7 +458,7 @@ static int i915_apply_post_reloc(uint32_t reloc[],
}
static int i915_post_relocs(struct drm_file *file_priv,
uint32_t __user *new_reloc_ptr,
uint32_t __user * new_reloc_ptr,
struct drm_i915_validate_buffer *buffers,
unsigned int num_buffers)
{
@ -455,7 +477,7 @@ static int i915_post_relocs(struct drm_file *file_priv,
uint32_t reloc_buf_size;
uint32_t *reloc_buf;
for (i=0; i<num_buffers; ++i) {
for (i = 0; i < num_buffers; ++i) {
if (unlikely(!buffers[i].presumed_offset_correct)) {
short_circuit = 0;
break;
@ -467,7 +489,7 @@ static int i915_post_relocs(struct drm_file *file_priv,
memset(&relocatee, 0, sizeof(relocatee));
while(new_reloc_ptr) {
while (new_reloc_ptr) {
reloc_ptr = new_reloc_ptr;
ret = get_user(num_relocs, reloc_ptr);
@ -475,7 +497,7 @@ static int i915_post_relocs(struct drm_file *file_priv,
goto out;
if (unlikely(!access_ok(VERIFY_READ, reloc_ptr,
header_size +
num_relocs * reloc_stride)))
num_relocs * reloc_stride)))
return -EFAULT;
ret = __get_user(reloc_type, reloc_ptr + 1);
@ -490,14 +512,15 @@ static int i915_post_relocs(struct drm_file *file_priv,
ret = __get_user(new_reloc_data, reloc_ptr + 2);
new_reloc_ptr = (uint32_t __user *) (unsigned long)
new_reloc_data;
new_reloc_data;
reloc_ptr += I915_RELOC_HEADER;
if (num_relocs == 0)
goto out;
reloc_buf_size = (num_relocs * I915_RELOC0_STRIDE) * sizeof(uint32_t);
reloc_buf_size =
(num_relocs * I915_RELOC0_STRIDE) * sizeof(uint32_t);
reloc_buf = kmalloc(reloc_buf_size, GFP_KERNEL);
if (!reloc_buf) {
DRM_ERROR("Out of memory for reloc buffer\n");
@ -527,9 +550,17 @@ static int i915_post_relocs(struct drm_file *file_priv,
reloc_buf = NULL;
}
i915_clear_relocatee(&relocatee);
}
}
out:
out:
/*
* Flush ring relocs so the command parser will pick them up.
*/
if (relocatee.performed_ring_relocs)
(void)i915_emit_mi_flush(file_priv->head->dev, 0);
i915_clear_relocatee(&relocatee);
if (reloc_buf) {
kfree(reloc_buf);
reloc_buf = NULL;
@ -540,8 +571,7 @@ out:
static int i915_check_presumed(struct drm_i915_op_arg *arg,
struct drm_buffer_object *bo,
uint32_t __user *data,
int *presumed_ok)
uint32_t __user * data, int *presumed_ok)
{
struct drm_bo_op_req *req = &arg->d.req;
uint32_t hint_offset;
@ -566,20 +596,19 @@ static int i915_check_presumed(struct drm_i915_op_arg *arg,
* Needless to say, this is a bit ugly.
*/
hint_offset = (uint32_t *)&req->bo_req.hint - (uint32_t *)arg;
hint_offset = (uint32_t *) & req->bo_req.hint - (uint32_t *) arg;
hint &= ~DRM_BO_HINT_PRESUMED_OFFSET;
return __put_user(hint, data + hint_offset);
}
/*
* Validate, add fence and relocate a block of bos from a userspace list
*/
int i915_validate_buffer_list(struct drm_file *file_priv,
unsigned int fence_class, uint64_t data,
struct drm_i915_validate_buffer *buffers,
uint32_t *num_buffers,
uint32_t __user **post_relocs)
uint32_t * num_buffers,
uint32_t __user ** post_relocs)
{
struct drm_i915_op_arg arg;
struct drm_bo_op_req *req = &arg.d.req;
@ -599,8 +628,10 @@ int i915_validate_buffer_list(struct drm_file *file_priv,
item = buffers + buf_count;
item->buffer = NULL;
item->presumed_offset_correct = 0;
item->idle = i915_reloc_unchecked;
if (copy_from_user(&arg, (void __user *)(unsigned long)data, sizeof(arg))) {
if (copy_from_user
(&arg, (void __user *)(unsigned long)data, sizeof(arg))) {
ret = -EFAULT;
goto out_err;
}
@ -613,10 +644,10 @@ int i915_validate_buffer_list(struct drm_file *file_priv,
goto out_err;
}
item->ret = 0;
item->data = (void __user *) (unsigned long) data;
item->data = (void __user *)(unsigned long)data;
buf_handle = req->bo_req.handle;
reloc_user_ptr = (uint32_t *)(unsigned long)arg.reloc_ptr;
reloc_user_ptr = (uint32_t *) (unsigned long)arg.reloc_ptr;
/*
* Switch mode to post-validation relocations?
@ -626,7 +657,7 @@ int i915_validate_buffer_list(struct drm_file *file_priv,
(reloc_user_ptr != NULL))) {
uint32_t reloc_type;
ret = get_user(reloc_type, reloc_user_ptr+1);
ret = get_user(reloc_type, reloc_user_ptr + 1);
if (ret)
goto out_err;
@ -636,18 +667,19 @@ int i915_validate_buffer_list(struct drm_file *file_priv,
}
if ((*post_relocs == NULL) && (reloc_user_ptr != NULL)) {
ret = i915_exec_reloc(file_priv, buf_handle, reloc_user_ptr, buffers, buf_count);
ret =
i915_exec_reloc(file_priv, buf_handle,
reloc_user_ptr, buffers, buf_count);
if (ret)
goto out_err;
DRM_MEMORYBARRIER();
}
ret = drm_bo_handle_validate(file_priv, req->bo_req.handle,
req->bo_req.flags, req->bo_req.mask,
req->bo_req.hint,
req->bo_req.flags,
req->bo_req.mask, req->bo_req.hint,
req->bo_req.fence_class, 0,
&item->rep,
&item->buffer);
&item->rep, &item->buffer);
if (ret) {
DRM_ERROR("error on handle validate %d\n", ret);
goto out_err;
@ -657,20 +689,19 @@ int i915_validate_buffer_list(struct drm_file *file_priv,
ret = i915_check_presumed(&arg, item->buffer,
(uint32_t __user *)
(unsigned long) data,
(unsigned long)data,
&item->presumed_offset_correct);
if (ret)
goto out_err;
data = arg.next;
} while (data != 0);
out_err:
out_err:
*num_buffers = buf_count;
item->ret = (ret != -EAGAIN) ? ret : 0;
return ret;
}
/*
* Remove all buffers from the unfenced list.
* If the execbuffer operation was aborted, for example due to a signal,
@ -719,8 +750,7 @@ void i915_fence_or_sync(struct drm_file *file_priv,
int ret;
struct drm_fence_object *fence;
ret = drm_fence_buffer_objects(dev, NULL, fence_flags,
NULL, &fence);
ret = drm_fence_buffer_objects(dev, NULL, fence_flags, NULL, &fence);
if (ret) {
@ -729,8 +759,8 @@ void i915_fence_or_sync(struct drm_file *file_priv,
* Fall back to synchronous operation and idle the engine.
*/
(void) i915_emit_mi_flush(dev, MI_READ_FLUSH);
(void) i915_quiescent(dev);
(void)i915_emit_mi_flush(dev, MI_READ_FLUSH);
(void)i915_quiescent(dev);
if (!(fence_flags & DRM_FENCE_FLAG_NO_USER)) {
@ -746,7 +776,7 @@ void i915_fence_or_sync(struct drm_file *file_priv,
drm_putback_buffer_objects(dev);
if (fence_p)
*fence_p = NULL;
*fence_p = NULL;
return;
}
@ -766,8 +796,7 @@ void i915_fence_or_sync(struct drm_file *file_priv,
* to indicate engine "sufficiently" idle.
*/
(void) drm_fence_object_wait(fence, 0, 1,
fence->type);
(void)drm_fence_object_wait(fence, 0, 1, fence->type);
drm_fence_usage_deref_unlocked(&fence);
fence_arg->handle = ~0;
fence_arg->error = ret;
@ -780,13 +809,12 @@ void i915_fence_or_sync(struct drm_file *file_priv,
drm_fence_usage_deref_unlocked(&fence);
}
int i915_execbuffer(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
drm_i915_sarea_t *sarea_priv = (drm_i915_sarea_t *)
dev_priv->sarea_priv;
dev_priv->sarea_priv;
struct drm_i915_execbuffer *exec_buf = data;
struct drm_i915_batchbuffer *batch = &exec_buf->batch;
struct drm_fence_arg *fence_arg = &exec_buf->fence_arg;
@ -802,7 +830,8 @@ int i915_execbuffer(struct drm_device *dev, void *data,
if (batch->num_cliprects && DRM_VERIFYAREA_READ(batch->cliprects,
batch->num_cliprects *
sizeof(struct drm_clip_rect)))
sizeof(struct
drm_clip_rect)))
return -EFAULT;
if (exec_buf->num_buffers > dev_priv->max_validate_buffers)
@ -825,7 +854,9 @@ int i915_execbuffer(struct drm_device *dev, void *data,
num_buffers = exec_buf->num_buffers;
buffers = drm_calloc(num_buffers, sizeof(struct drm_i915_validate_buffer), DRM_MEM_DRIVER);
buffers =
drm_calloc(num_buffers, sizeof(struct drm_i915_validate_buffer),
DRM_MEM_DRIVER);
if (!buffers) {
drm_bo_read_unlock(&dev->bm.bm_lock);
mutex_unlock(&dev_priv->cmdbuf_mutex);
@ -850,33 +881,30 @@ int i915_execbuffer(struct drm_device *dev, void *data,
if (!post_relocs) {
drm_agp_chipset_flush(dev);
batch->start = buffers[num_buffers-1].buffer->offset;
batch->start = buffers[num_buffers - 1].buffer->offset;
} else {
batch->start += buffers[0].buffer->offset;
}
#if 1
// (void) i915_emit_mi_flush(dev, MI_NO_WRITE_FLUSH | MI_READ_FLUSH | MI_EXE_FLUSH);
DRM_DEBUG("i915 exec batchbuffer, start %x used %d cliprects %d\n",
batch->start, batch->used, batch->num_cliprects);
ret = i915_dispatch_batchbuffer(dev, batch);
if (ret)
goto out_err0;
#endif
if (sarea_priv)
sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
i915_fence_or_sync(file_priv, fence_arg->flags, fence_arg, NULL);
out_err0:
/* handle errors */
out_err0:
ret = i915_handle_copyback(dev, buffers, num_buffers, ret);
mutex_lock(&dev->struct_mutex);
i915_dereference_buffers_locked(buffers, num_buffers);
mutex_unlock(&dev->struct_mutex);
drm_free(buffers, (exec_buf->num_buffers * sizeof(struct drm_buffer_object *)), DRM_MEM_DRIVER);
drm_free(buffers,
(exec_buf->num_buffers * sizeof(struct drm_buffer_object *)),
DRM_MEM_DRIVER);
mutex_unlock(&dev_priv->cmdbuf_mutex);
drm_bo_read_unlock(&dev->bm.bm_lock);

14
shared-core/i915_drm.h
View File

@ -358,8 +358,22 @@ typedef struct drm_i915_hws_addr {
* 2 - buffer handle
* 3 - reserved (for optimisations later).
*/
/*
* type 1 relocation has 4-uint32_t stride.
* Hangs off the first item in the op list.
* Performed after all valiations are done.
* Try to group relocs into the same relocatee together for
* performance reasons.
* 0 - offset into buffer
* 1 - delta to add in
* 2 - buffer index in op list.
* 3 - relocatee index in op list.
*/
#define I915_RELOC_TYPE_0 0
#define I915_RELOC0_STRIDE 4
#define I915_RELOC_TYPE_1 1
#define I915_RELOC1_STRIDE 4
struct drm_i915_op_arg {
uint64_t next;