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Date: Fri, 13 Mar 2009 09:59:59 -0700 From: Jeremy Fitzhardinge <jeremy@...p.org> To: "H. Peter Anvin" <hpa@...or.com> Cc: the arch/x86 maintainers <x86@...nel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Xen-devel <xen-devel@...ts.xensource.com>, David Airlie <airlied@...ux.ie>, Ian Campbell <ian.campbell@...rix.com> Subject: [PATCH 14/27] xen: enable swiotlb for xen domain 0. From: Ian Campbell <ian.campbell@...rix.com> Signed-off-by: Ian Campbell <ian.campbell@...rix.com> --- arch/x86/kernel/pci-swiotlb.c | 4 ++++ arch/x86/xen/Kconfig | 1 + drivers/pci/xen-iommu.c | 5 +++++ include/xen/swiotlb.h | 2 ++ 4 files changed, 12 insertions(+), 0 deletions(-) diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c index 5826be8..6d3ba02 100644 --- a/arch/x86/kernel/pci-swiotlb.c +++ b/arch/x86/kernel/pci-swiotlb.c @@ -94,6 +94,10 @@ void __init pci_swiotlb_init(void) if (!iommu_detected && !no_iommu && max_pfn > MAX_DMA32_PFN) swiotlb = 1; #endif +#ifdef CONFIG_PCI_XEN + if (xen_wants_swiotlb()) + swiotlb = 1; +#endif if (swiotlb_force) swiotlb = 1; if (swiotlb) { diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig index 87c13db..2c85967 100644 --- a/arch/x86/xen/Kconfig +++ b/arch/x86/xen/Kconfig @@ -6,6 +6,7 @@ config XEN bool "Xen guest support" select PARAVIRT select PARAVIRT_CLOCK + select SWIOTLB depends on X86_64 || (X86_32 && X86_PAE && !X86_VISWS) depends on X86_CMPXCHG && X86_TSC help diff --git a/drivers/pci/xen-iommu.c b/drivers/pci/xen-iommu.c index 0995ddf..80bb7ed 100644 --- a/drivers/pci/xen-iommu.c +++ b/drivers/pci/xen-iommu.c @@ -67,6 +67,11 @@ void xen_swiotlb_fixup(void *buf, size_t size, unsigned long nslabs) } } +int xen_wants_swiotlb(void) +{ + return xen_initial_domain(); +} + dma_addr_t xen_phys_to_bus(phys_addr_t paddr) { return phys_to_machine(XPADDR(paddr)).maddr; diff --git a/include/xen/swiotlb.h b/include/xen/swiotlb.h index e15caa8..defac5c 100644 --- a/include/xen/swiotlb.h +++ b/include/xen/swiotlb.h @@ -9,6 +9,8 @@ static inline void xen_swiotlb_fixup(void *buf, size_t size, unsigned long nslab } #endif +extern int xen_wants_swiotlb(void); + extern phys_addr_t xen_bus_to_phys(dma_addr_t daddr); extern dma_addr_t xen_phys_to_bus(phys_addr_t paddr); -- 1.6.0.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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