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iris: Handle PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE somewhat

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Various places in the transfer code need to know whether they must
read the existing resource's values.  Rather than checking both flags
everywhere, just make PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE also flag
PIPE_TRANSFER_DISCARD_RANGE - if we can discard everything, we can
discard a subrange, too.

Obviously, we can do better for PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE,
but eventually u_threaded_context should handle swapping out buffers
for new idle buffers, anyway.  In the meantime, this is at least better.
This commit is contained in:
Kenneth Graunke 2018-12-31 22:03:35 -08:00
parent bacc722d13
commit 8eda6f2288
1 changed files with 6 additions and 3 deletions
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9
src/gallium/drivers/iris/iris_resource.c
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@ -824,6 +824,12 @@ iris_transfer_map(struct pipe_context *ctx,
struct iris_resource *res = (struct iris_resource *)resource;
struct isl_surf *surf = &res->surf;
/* If we can discard the whole resource, we can also discard the
* subrange being accessed.
*/
if (usage & PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE)
usage |= PIPE_TRANSFER_DISCARD_RANGE;
if (surf->tiling != ISL_TILING_LINEAR &&
(usage & PIPE_TRANSFER_MAP_DIRECTLY))
return NULL;
@ -841,9 +847,6 @@ iris_transfer_map(struct pipe_context *ctx,
struct iris_transfer *map = slab_alloc(&ice->transfer_pool);
struct pipe_transfer *xfer = &map->base;
// PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE
// PIPE_TRANSFER_DISCARD_RANGE
if (!map)
return NULL;