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iris: Promote DISCARD_RANGE to DISCARD_WHOLE_RESOURCE where possible

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This allows us to replace the backing storage for a buffer, which
means we'd have an idle buffer and thus could do an unsynchronized
mapping where we otherwise wouldn't.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19209>
This commit is contained in:
Kenneth Graunke 2022-09-29 17:38:53 -07:00 • committed by Marge Bot
parent 465eb092ed
commit 6954a8ddbe
1 changed files with 10 additions and 0 deletions
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10
src/gallium/drivers/iris/iris_resource.c
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@ -2383,6 +2383,16 @@ iris_transfer_map(struct pipe_context *ctx,
if (res->base.is_user_ptr)
usage |= PIPE_MAP_PERSISTENT;
/* Promote discarding a range to discarding the entire buffer where
* possible. This may allow us to replace the backing storage entirely
* and let us do an unsynchronized map when we otherwise wouldn't.
*/
if (resource->target == PIPE_BUFFER &&
(usage & PIPE_MAP_DISCARD_RANGE) &&
box->x == 0 && box->width == resource->width0) {
usage |= PIPE_MAP_DISCARD_WHOLE_RESOURCE;
}
if (usage & PIPE_MAP_DISCARD_WHOLE_RESOURCE) {
/* Replace the backing storage with a fresh buffer for non-async maps */
if (!(usage & (PIPE_MAP_UNSYNCHRONIZED |