i965: Track when a bo is shared with an external client

If the buffer is being shared with an external client, our own state
tracking may be stale and in some cases we may wish to double check with
the kernel/hw state. At the moment, this is synonymous with not being
reusable, but the semantics between reusable and external are quite
different and we will have more examples of non-reusable buffers in the
near future.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>

2 files changed, 9 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_bufmgr.c b/src/mesa/drivers/dri/i965/brw_bufmgr.c
index ee4a5cfa2c8..ec6ab51c12e 100644
--- a/src/mesa/drivers/dri/i965/brw_bufmgr.c
+++ b/src/mesa/drivers/dri/i965/brw_bufmgr.c
@@ -483,6 +483,7 @@ brw_bo_gem_create_from_name(struct brw_bufmgr *bufmgr,
    bo->name = name;
    bo->global_name = handle;
    bo->reusable = false;
+   bo->external = true;
 
    _mesa_hash_table_insert(bufmgr->handle_table, &bo->gem_handle, bo);
    _mesa_hash_table_insert(bufmgr->name_table, &bo->global_name, bo);
@@ -997,6 +998,7 @@ brw_bo_gem_create_from_prime(struct brw_bufmgr *bufmgr, int prime_fd)
 
    bo->name = "prime";
    bo->reusable = false;
+   bo->external = true;
 
    memclear(get_tiling);
    get_tiling.handle = bo->gem_handle;
@@ -1027,6 +1029,7 @@ brw_bo_gem_export_to_prime(struct brw_bo *bo, int *prime_fd)
       return -errno;
 
    bo->reusable = false;
+   bo->external = true;
 
    return 0;
 }
@@ -1048,6 +1051,7 @@ brw_bo_flink(struct brw_bo *bo, uint32_t *name)
       if (!bo->global_name) {
          bo->global_name = flink.name;
          bo->reusable = false;
+         bo->external = true;
 
          _mesa_hash_table_insert(bufmgr->name_table, &bo->global_name, bo);
       }
diff --git a/src/mesa/drivers/dri/i965/brw_bufmgr.h b/src/mesa/drivers/dri/i965/brw_bufmgr.h
index 80c71825e80..d388e5ad150 100644
--- a/src/mesa/drivers/dri/i965/brw_bufmgr.h
+++ b/src/mesa/drivers/dri/i965/brw_bufmgr.h
@@ -124,6 +124,11 @@ struct brw_bo {
    bool reusable;
 
    /**
+    * Boolean of whether this buffer has been shared with an external client.
+    */
+   bool external;
+
+   /**
     * Boolean of whether this buffer is cache coherent
     */
    bool cache_coherent;