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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2009-04-15 18:22:41 +0900 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-04-15 12:22:37 +0200 |
| commit | e6a1a89d572c31b62d6dcf11a371c7323852d9b2 (patch) | |
| tree | bca6ff9d83ae6820c3dd4270e165705c12b66f56 /include/linux/dma-debug.h | |
| parent | 7e05575c422d45f393c2d9b5900e97a30bf69bea (diff) | |
| download | lwn-e6a1a89d572c31b62d6dcf11a371c7323852d9b2.tar.gz lwn-e6a1a89d572c31b62d6dcf11a371c7323852d9b2.zip | |
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.h | 7 |
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, |