linux-kernel - [PATCH 4/7] swiotlb: Allow arch override of address_needs

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Date:	Fri,  3 Apr 2009 20:56:46 -0500
From:	Becky Bruce <beckyb@...nel.crashing.org>
To:	linux-kernel@...r.kernel.org, mingo@...e.hu, jeremy@...p.org,
	fujita.tomonori@....ntt.co.jp, ian.campbell@...rix.com
Cc:	Becky Bruce <beckyb@...nel.crashing.org>
Subject: [PATCH 4/7] swiotlb: Allow arch override of address_needs_mapping

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@...nel.crashing.org>
---
 lib/swiotlb.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index eb6dbbd..af2ec25 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -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)
-- 
1.5.6.6

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