[igt-dev] [PATCH 2/2] lib/intel_batchbuffer: allow GTT size be not power of 2

[Andrzej Hajda]

GTT size reported by the driver can be shorter than
the actual size due to possible reserved addresses.
Rounding it up to power of 2 should give us back
actual GTT size.
The patch is prerequisite for upcoming driver changes
introducing per context batch buffers.

Signed-off-by: Andrzej Hajda <andrzej.hajda at intel.com>
---
 lib/intel_batchbuffer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/intel_batchbuffer.c b/lib/intel_batchbuffer.c
index df82ef5f5ca..c32d04302fe 100644
--- a/lib/intel_batchbuffer.c
+++ b/lib/intel_batchbuffer.c
@@ -1675,7 +1675,7 @@ __intel_bb_add_object(struct intel_bb *ibb, uint32_t handle, uint64_t size,
 			offset = __intel_bb_get_offset(ibb, handle, size,
 						       alignment);
 		} else {
-			offset = offset & (ibb->gtt_size - 1);
+			offset = offset & (roundup_power_of_two(ibb->gtt_size) - 1);
 
 			/*
 			 * For simple allocator check entry consistency

-- 
2.34.1