swiotlb: allow arch override of address_needs_mapping
Becky Bruce [Wed, 8 Apr 2009 14:09:18 +0000 (09:09 -0500)]
Some architectures require additional checking to determine
if a device can dma to an address and need to provide their
own address_needs_mapping..

Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Cc: jeremy@goop.org
Cc: ian.campbell@citrix.com
LKML-Reference: <1239199761-22886-5-git-send-email-galak@kernel.crashing.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

lib/swiotlb.c

index e8a47c8..d81afab 100644 (file)
@@ -145,6 +145,12 @@ static void *swiotlb_bus_to_virt(dma_addr_t address)
        return phys_to_virt(swiotlb_bus_to_phys(address));
 }
 
+int __weak swiotlb_arch_address_needs_mapping(struct device *hwdev,
+                                              dma_addr_t addr, size_t size)
+{
+       return !is_buffer_dma_capable(dma_get_mask(hwdev), addr, size);
+}
+
 int __weak swiotlb_arch_range_needs_mapping(phys_addr_t paddr, size_t size)
 {
        return 0;
@@ -309,10 +315,10 @@ cleanup1:
        return -ENOMEM;
 }
 
-static int
+static inline int
 address_needs_mapping(struct device *hwdev, dma_addr_t addr, size_t size)
 {
-       return !is_buffer_dma_capable(dma_get_mask(hwdev), addr, size);
+       return swiotlb_arch_address_needs_mapping(hwdev, addr, size);
 }
 
 static inline int range_needs_mapping(phys_addr_t paddr, size_t size)