From 32e09870eedfb501a6cb5729d8c23f44f8a7cbdd Mon Sep 17 00:00:00 2001 From: Julien Grall Date: Fri, 7 Aug 2015 17:34:35 +0100 Subject: xen: Make clear that swiotlb and biomerge are dealing with DMA address The swiotlb is required when programming a DMA address on ARM when a device is not protected by an IOMMU. In this case, the DMA address should always be equal to the machine address. For DOM0 memory, Xen ensure it by have an identity mapping between the guest address and host address. However, when mapping a foreign grant reference, the 1:1 model doesn't work. For ARM guest, most of the callers of pfn_to_mfn expects to get a GFN (Guest Frame Number), i.e a PFN (Page Frame Number) from the Linux point of view given that all ARM guest are auto-translated. Even though the name pfn_to_mfn is misleading, we need to ensure that those caller get a GFN and not by mistake a MFN. In pratical, I haven't seen error related to this but we should fix it for the sake of correctness. In order to fix the implementation of pfn_to_mfn on ARM in a follow-up patch, we have to introduce new helpers to return the DMA from a PFN and the invert. On x86, the new helpers will be an alias of pfn_to_mfn and mfn_to_pfn. The helpers will be used in swiotlb and xen_biovec_phys_mergeable. This is necessary in the latter because we have to ensure that the biovec code will not try to merge a biovec using foreign page and another using Linux memory. Lastly, the helper mfn_to_local_pfn has been renamed to bfn_to_local_pfn given that the only usage was in swiotlb. Signed-off-by: Julien Grall Reviewed-by: Stefano Stabellini Signed-off-by: David Vrabel --- arch/arm/include/asm/xen/page.h | 23 +++++++++++++++++++++-- arch/arm/xen/mm.c | 4 ++-- 2 files changed, 23 insertions(+), 4 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/include/asm/xen/page.h b/arch/arm/include/asm/xen/page.h index 98b1084f8282..5f76a9e7ef1b 100644 --- a/arch/arm/include/asm/xen/page.h +++ b/arch/arm/include/asm/xen/page.h @@ -52,7 +52,26 @@ static inline unsigned long mfn_to_pfn(unsigned long mfn) return mfn; } -#define mfn_to_local_pfn(mfn) mfn_to_pfn(mfn) +/* Pseudo-physical <-> BUS conversion */ +static inline unsigned long pfn_to_bfn(unsigned long pfn) +{ + unsigned long mfn; + + if (phys_to_mach.rb_node != NULL) { + mfn = __pfn_to_mfn(pfn); + if (mfn != INVALID_P2M_ENTRY) + return mfn; + } + + return pfn; +} + +static inline unsigned long bfn_to_pfn(unsigned long bfn) +{ + return bfn; +} + +#define bfn_to_local_pfn(bfn) bfn_to_pfn(bfn) /* VIRT <-> MACHINE conversion */ #define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v))) @@ -96,7 +115,7 @@ static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn) bool xen_arch_need_swiotlb(struct device *dev, unsigned long pfn, - unsigned long mfn); + unsigned long bfn); unsigned long xen_get_swiotlb_free_pages(unsigned int order); #endif /* _ASM_ARM_XEN_PAGE_H */ diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c index 03e75fef15b8..6dd911d1f0ac 100644 --- a/arch/arm/xen/mm.c +++ b/arch/arm/xen/mm.c @@ -139,9 +139,9 @@ void __xen_dma_sync_single_for_device(struct device *hwdev, bool xen_arch_need_swiotlb(struct device *dev, unsigned long pfn, - unsigned long mfn) + unsigned long bfn) { - return (!hypercall_cflush && (pfn != mfn) && !is_device_dma_coherent(dev)); + return (!hypercall_cflush && (pfn != bfn) && !is_device_dma_coherent(dev)); } int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order, -- cgit v1.2.3