From: Ian Campbell <ian.campbell@xxxxxxxxxx>
Add hook so that Xen can determine whether a particular address range needs
pfn<->mfn mapping.
Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
arch/x86/kernel/pci-swiotlb.c | 4 ++++
drivers/pci/xen-iommu.c | 5 +++++
include/xen/swiotlb.h | 2 ++
3 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
index 0943813..5826be8 100644
--- a/arch/x86/kernel/pci-swiotlb.c
+++ b/arch/x86/kernel/pci-swiotlb.c
@@ -51,6 +51,10 @@ phys_addr_t swiotlb_bus_to_phys(dma_addr_t baddr)
int __weak swiotlb_arch_range_needs_mapping(phys_addr_t paddr, size_t size)
{
+#ifdef CONFIG_PCI_XEN
+ if (xen_pv_domain())
+ return xen_range_needs_mapping(paddr, size);
+#endif
return 0;
}
diff --git a/drivers/pci/xen-iommu.c b/drivers/pci/xen-iommu.c
index e7ba06b..0995ddf 100644
--- a/drivers/pci/xen-iommu.c
+++ b/drivers/pci/xen-iommu.c
@@ -126,6 +126,11 @@ static int range_straddles_page_boundary(phys_addr_t p,
size_t size)
return 1;
}
+int xen_range_needs_mapping(phys_addr_t paddr, size_t size)
+{
+ return range_straddles_page_boundary(paddr, size);
+}
+
static inline void xen_dma_unmap_page(struct page *page)
{
/* Xen TODO: 2.6.18 xen calls __gnttab_dma_unmap_page here
diff --git a/include/xen/swiotlb.h b/include/xen/swiotlb.h
index 9ecaff1..e15caa8 100644
--- a/include/xen/swiotlb.h
+++ b/include/xen/swiotlb.h
@@ -12,4 +12,6 @@ static inline void xen_swiotlb_fixup(void *buf, size_t size,
unsigned long nslab
extern phys_addr_t xen_bus_to_phys(dma_addr_t daddr);
extern dma_addr_t xen_phys_to_bus(phys_addr_t paddr);
+extern int xen_range_needs_mapping(phys_addr_t phys, size_t size);
+
#endif /* _XEN_SWIOTLB_H */
--
1.6.0.6
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