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authorMilton Miller <miltonm@bga.com>2011-06-24 13:05:23 +0400
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-09-20 03:18:38 +0400
commit3a8f7558e475b68254d8bc3a2211f3f89bf67a71 (patch)
tree798872b1cef90988846350f4d420954238107427 /include/linux/dma-mapping.h
parent6a5c7be5e484bda5b2639fedf7dbe3f25c15c962 (diff)
downloadlinux-3a8f7558e475b68254d8bc3a2211f3f89bf67a71.tar.xz
dma-mapping: Add get_required_mask if arch overrides default
If an architecture sets ARCH_HAS_DMA_GET_REQUIRED_MASK and has settable dma_map_ops, the required mask may change by the ops implementation. For example, a system that always has an mmu inline may only require 32 bits while a swiotlb would desire bits to cover all of memory. Therefore add the field if the architecture does not use the generic definition of dma_get_required_mask. The first use will by by powerpc. Note that this does add some dependency on the order in which files are visible here. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Diffstat (limited to 'include/linux/dma-mapping.h')
-rw-r--r--include/linux/dma-mapping.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 347fdc32177a..aa32fecd1d34 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -41,6 +41,9 @@ struct dma_map_ops {
int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
int (*dma_supported)(struct device *dev, u64 mask);
int (*set_dma_mask)(struct device *dev, u64 mask);
+#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
+ u64 (*get_required_mask)(struct device *dev);
+#endif
int is_phys;
};