linux-kernel - Re: Where do we stand with the Xen patches?

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Date:	Thu, 21 May 2009 11:28:53 +0100
From:	Ian Campbell <ijc@...lion.org.uk>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	jeremy@...p.org, mingo@...e.hu, x86@...nel.org,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	gregkh@...e.de, okir@...e.de, beckyb@...nel.crashing.org
Subject: Re: Where do we stand with the Xen patches?

On Thu, 2009-05-21 at 11:27 +0100, Ian Campbell wrote:
> The corresponding the Xen updates will...
...follow.

Subject:swiotlb/xen: add implementation of swiotlb_range_needs_mapping hook

This function is now implemented via asm/dma-mapping.h rather than as
a weak hook in swiotlb.c

Signed-off-by: Ian Campbell <ian.campbell@...rix.com>

diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index a80139a..ed51bd1 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h
@@ -315,9 +315,15 @@ static inline int is_buffer_dma_capable(struct device *dev, u64 mask,
 	return addr + size <= mask;
 }
 
+#ifdef CONFIG_PCI_XEN
+extern int xen_range_needs_mapping(phys_addr_t paddr, size_t size);
+#else
+static inline int xen_range_needs_mapping(phys_addr_t paddr, size_t size) { return 0; }
+#endif
+
 static int inline swiotlb_range_needs_mapping(phys_addr_t paddr, size_t size)
 {
-	return 0;
+	return xen_range_needs_mapping(paddr, size);
 }
 
 #endif
diff --git a/arch/x86/xen/pci-swiotlb.c b/arch/x86/xen/pci-swiotlb.c
index 5a46418..e23b00b 100644
--- a/arch/x86/xen/pci-swiotlb.c
+++ b/arch/x86/xen/pci-swiotlb.c
@@ -43,11 +43,3 @@ phys_addr_t swiotlb_bus_to_phys(struct device *hwdev, dma_addr_t baddr)
 
 	return baddr;
 }
-
-int swiotlb_arch_range_needs_mapping(phys_addr_t paddr, size_t size)
-{
-	if (xen_pv_domain())
-		return xen_range_needs_mapping(paddr, size);
-
-	return 0;
-}
diff --git a/drivers/pci/xen-iommu.c b/drivers/pci/xen-iommu.c
index 41c276f..003ffe3 100644
--- a/drivers/pci/xen-iommu.c
+++ b/drivers/pci/xen-iommu.c
@@ -132,6 +132,8 @@ static int range_straddles_page_boundary(phys_addr_t p, size_t size)
 
 int xen_range_needs_mapping(phys_addr_t paddr, size_t size)
 {
+	if (!xen_pv_domain())
+		return 0;
 	return range_straddles_page_boundary(paddr, size);
 }
 


-- 
Ian Campbell
Current Noise: Isis - Wills Dissolve

"Hey Ivan, check your six."
-- Sidewinder missile jacket patch, showing a Sidewinder driving up the tail
 of a Russian Su-27

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