diff mbox

[v2,3/9] x86, dma: Support allocate memory from bottom upwards in dma_contiguous_reserve().

Message ID 1378894057-30946-4-git-send-email-tangchen@cn.fujitsu.com (mailing list archive)
State Not Applicable, archived
Headers show

Commit Message

tangchen Sept. 11, 2013, 10:07 a.m. UTC 
During early boot, if the bottom up mode is set, just
try allocating bottom up from the end of kernel image,
and if that fails, do normal top down allocation.

So in function dma_contiguous_reserve(), we add the
above logic.

Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Reviewed-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
---
 drivers/base/dma-contiguous.c |   17 ++++++++++++++---
 1 files changed, 14 insertions(+), 3 deletions(-)
diff mbox

Patch

diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
index 6c9cdaa..3b4e031 100644
--- a/drivers/base/dma-contiguous.c
+++ b/drivers/base/dma-contiguous.c
@@ -260,17 +260,28 @@  int __init dma_declare_contiguous(struct device *dev, phys_addr_t size,
 			goto err;
 		}
 	} else {
+		phys_addr_t addr;
+
+		if (memblock_direction_bottom_up()) {
+			addr = memblock_alloc_bottom_up(
+						MEMBLOCK_ALLOC_ACCESSIBLE,
+						limit, size, alignment);
+			if (addr)
+				goto success;
+		}
+
 		/*
 		 * Use __memblock_alloc_base() since
 		 * memblock_alloc_base() panic()s.
 		 */
-		phys_addr_t addr = __memblock_alloc_base(size, alignment, limit);
+		addr = __memblock_alloc_base(size, alignment, limit);
 		if (!addr) {
 			base = -ENOMEM;
 			goto err;
-		} else {
-			base = addr;
 		}
+
+success:
+		base = addr;
 	}
 
 	/*