Mesa (main): zink: handle device-local unsynchronized maps

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Module: Mesa
Branch: main
Commit: d7256043b3ac3652a070ed0384db80effc99ed96
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=d7256043b3ac3652a070ed0384db80effc99ed96

Author: Mike Blumenkrantz <michael.blumenkrantz at gmail.com>
Date:   Fri Apr 15 13:25:00 2022 -0400

zink: handle device-local unsynchronized maps

this is only possible when tc determines the buffer is not in use
and decides to return a pointer immediately, so just give back a staging
buffer

cc: mesa-stable

Reviewed-by: Dave Airlie <airlied at redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15979>

---

 src/gallium/drivers/zink/zink_resource.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/gallium/drivers/zink/zink_resource.c b/src/gallium/drivers/zink/zink_resource.c
index d72aa5fa1e5..80c74449130 100644
--- a/src/gallium/drivers/zink/zink_resource.c
+++ b/src/gallium/drivers/zink/zink_resource.c
@@ -1506,6 +1506,15 @@ zink_buffer_map(struct pipe_context *pctx,
          ptr = map_resource(screen, res);
          ptr = ((uint8_t *)ptr) + trans->offset;
       }
+   } else if ((usage & PIPE_MAP_UNSYNCHRONIZED) && !res->obj->host_visible) {
+      trans->offset = box->x % screen->info.props.limits.minMemoryMapAlignment;
+      trans->staging_res = pipe_buffer_create(&screen->base, PIPE_BIND_LINEAR, PIPE_USAGE_STAGING, box->width + trans->offset);
+      if (!trans->staging_res)
+         goto fail;
+      struct zink_resource *staging_res = zink_resource(trans->staging_res);
+      res = staging_res;
+      ptr = map_resource(screen, res);
+      ptr = ((uint8_t *)ptr) + trans->offset;
    }
 
    if (!(usage & PIPE_MAP_UNSYNCHRONIZED)) {