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Use previous buffer offsets to compute proposed relocations

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This takes advantage of the DRM_BO_HINT_PRESUMED_OFFSET change and allows
the kernel to avoid mapping and re-writing buffers when relocations occur.
This commit is contained in:
Keith Packard 2007-12-06 14:11:34 -08:00
parent 46c405663b
commit aeca22f97c
2 changed files with 28 additions and 1 deletions
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7
src/mesa/drivers/dri/intel/intel_batchbuffer.c
View file

@ -246,7 +246,12 @@ intel_batchbuffer_emit_reloc(struct intel_batchbuffer *batch,
GLuint flags, GLuint delta)
{
dri_emit_reloc(batch->buf, flags, delta, batch->ptr - batch->map, buffer);
batch->ptr += 4;
/*
* Using the old buffer offset, write in what the right data would be, in case
* the buffer doesn't move and we can short-circuit the relocation processing
* in the kernel
*/
intel_batchbuffer_emit_dword (batch, buffer->offset + delta);
return GL_TRUE;
}

22
src/mesa/drivers/dri/intel/intel_bufmgr_ttm.c
View file

@ -193,6 +193,10 @@ intel_setup_validate_list(dri_bufmgr_ttm *bufmgr_ttm, GLuint *count_p)
req->op = drm_bo_validate;
req->bo_req.flags = node->flags;
req->bo_req.hint = 0;
#ifdef DRM_BO_HINT_PRESUMED_OFFSET
req->bo_req.hint |= DRM_BO_HINT_PRESUMED_OFFSET;
req->bo_req.presumed_offset = ((dri_bo *) node->priv)->offset;
#endif
req->bo_req.mask = node->mask;
req->bo_req.fence_class = 0; /* Backwards compat. */
arg->reloc_handle = 0;
@ -838,11 +842,29 @@ dri_ttm_process_reloc(dri_bo *batch_buf, GLuint *count)
return ptr;
}
static void
intel_update_buffer_offsets (dri_bufmgr_ttm *bufmgr_ttm)
{
struct intel_bo_list *list = &bufmgr_ttm->list;
struct intel_bo_node *node;
drmMMListHead *l;
struct drm_i915_op_arg *arg;
struct drm_bo_arg_rep *rep;
for (l = list->list.next; l != &list->list; l = l->next) {
node = DRMLISTENTRY(struct intel_bo_node, l, head);
arg = &node->bo_arg;
rep = &arg->d.rep;
((dri_bo *) node->priv)->offset = rep->bo_info.offset;
}
}
static void
dri_ttm_post_submit(dri_bo *batch_buf, dri_fence **last_fence)
{
dri_bufmgr_ttm *bufmgr_ttm = (dri_bufmgr_ttm *)batch_buf->bufmgr;
intel_update_buffer_offsets (bufmgr_ttm);
intel_free_validate_list(bufmgr_ttm);
intel_free_reloc_list(bufmgr_ttm);