[igt-dev] [PATCH i-g-t 1/2] lib/intel_blt: Release an offset in the allocator on buffer destroy

["Zbigniew Kempczyński" <zbigniew.kempczynski@intel.com>]

Blitter library code requires allocator handle only at the execution
time. That means blt_copy_object structure is allocator agnostic and
offsets are taken for block-copy or fast-copy just before operation.
Operations on bo's like close/create requires to reflect on the
allocator state, otherwise allocator will contain outdated
offsets + sizes leading to fail on allocator operations or the exec.

Helpers blt_create_object() and blt_destroy_object() are unaware
of allocator so if in the meantime object was used in block-copy or
fast-copy it has assigned offset in the allocator. Destroying object
with blt_destroy_object() doesn't release this offset what might
cause failures described above.

There're two possibilities how to solve this - to couple blitter
library with allocator or provide additional helpers which will
release offset in the allocator on destroy path. Latter one is
easier to provide so this is a subject of this change.

Signed-off-by: Zbigniew Kempczyński <zbigniew.kempczynski@intel.com>
Cc: Karolina Stolarek <karolina.stolarek@intel.com>
---
 lib/intel_blt.c | 15 ++++++++++++++-
 lib/intel_blt.h |  2 ++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/lib/intel_blt.c b/lib/intel_blt.c
index b55fa9b529..d2ea88d95f 100644
--- a/lib/intel_blt.c
+++ b/lib/intel_blt.c
@@ -1470,15 +1470,28 @@ blt_create_object(const struct blt_copy_data *blt, uint32_t region,
 	return obj;
 }
 
-void blt_destroy_object(int fd, struct blt_copy_object *obj)
+static void __blt_destroy_object(int fd, uint64_t ahnd, struct blt_copy_object *obj)
 {
 	if (obj->ptr)
 		munmap(obj->ptr, obj->size);
 
 	gem_close(fd, obj->handle);
+	if (ahnd)
+		intel_allocator_free(ahnd, obj->handle);
 	free(obj);
 }
 
+void blt_destroy_object(int fd, struct blt_copy_object *obj)
+{
+	__blt_destroy_object(fd, 0, obj);
+}
+
+void blt_destroy_object_and_alloc_free(int fd, uint64_t ahnd,
+				       struct blt_copy_object *obj)
+{
+	__blt_destroy_object(fd, ahnd, obj);
+}
+
 void blt_set_object(struct blt_copy_object *obj,
 		    uint32_t handle, uint64_t size, uint32_t region,
 		    uint8_t mocs, enum blt_tiling_type tiling,
diff --git a/lib/intel_blt.h b/lib/intel_blt.h
index d9c8883c7d..a9ddb99647 100644
--- a/lib/intel_blt.h
+++ b/lib/intel_blt.h
@@ -245,6 +245,8 @@ blt_create_object(const struct blt_copy_data *blt, uint32_t region,
 		  enum blt_compression_type compression_type,
 		  bool create_mapping);
 void blt_destroy_object(int fd, struct blt_copy_object *obj);
+void blt_destroy_object_and_alloc_free(int fd, uint64_t ahnd,
+				       struct blt_copy_object *obj);
 void blt_set_object(struct blt_copy_object *obj,
 		    uint32_t handle, uint64_t size, uint32_t region,
 		    uint8_t mocs, enum blt_tiling_type tiling,
-- 
2.34.1