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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2009-04-15 13:22:41 +0400
committerIngo Molnar <mingo@elte.hu>2009-04-15 14:22:37 +0400
commite6a1a89d572c31b62d6dcf11a371c7323852d9b2 (patch)
treebca6ff9d83ae6820c3dd4270e165705c12b66f56 /include/linux/dma-debug.h
parent7e05575c422d45f393c2d9b5900e97a30bf69bea (diff)
downloadlinux-e6a1a89d572c31b62d6dcf11a371c7323852d9b2.tar.xz
dma-debug: add dma_debug_resize_entries() to adjust the number of dma_debug_entries
We use a static value for the number of dma_debug_entries. It can be overwritten by a kernel command line option. Some IOMMUs (e.g. GART) can't set an appropriate value by a kernel command line option because they can't know such value until they finish initializing up their hardware. This patch adds dma_debug_resize_entries() enables IOMMUs to adjust the number of dma_debug_entries anytime. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Joerg Roedel <joerg.roedel@amd.com> Cc: fujita.tomonori@lab.ntt.co.jp Cc: akpm@linux-foundation.org LKML-Reference: <20090415182234R.fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/dma-debug.h')
-rw-r--r--include/linux/dma-debug.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/dma-debug.h b/include/linux/dma-debug.h
index 28d53cb7b5a2..171ad8aedc83 100644
--- a/include/linux/dma-debug.h
+++ b/include/linux/dma-debug.h
@@ -32,6 +32,8 @@ extern void dma_debug_add_bus(struct bus_type *bus);
extern void dma_debug_init(u32 num_entries);
+extern int dma_debug_resize_entries(u32 num_entries);
+
extern void debug_dma_map_page(struct device *dev, struct page *page,
size_t offset, size_t size,
int direction, dma_addr_t dma_addr,
@@ -91,6 +93,11 @@ static inline void dma_debug_init(u32 num_entries)
{
}
+static inline int dma_debug_resize_entries(u32 num_entries)
+{
+ return 0;
+}
+
static inline void debug_dma_map_page(struct device *dev, struct page *page,
size_t offset, size_t size,
int direction, dma_addr_t dma_addr,