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b827760053
With this patch we provide the functionality to initialize the Xen-SWIOTLB late in the bootup cycle - specifically for Xen PCI-frontend. We still will work if the user had supplied 'iommu=soft' on the Linux command line. Note: We cannot depend on after_bootmem to automatically determine whether this is early or not. This is because when PCI IOMMUs are initialized it is after after_bootmem but before a lot of "other" subsystems are initialized. CC: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> [v1: Fix smatch warnings] [v2: Added check for xen_swiotlb] [v3: Rebased with new xen-swiotlb changes] [v4: squashed xen/swiotlb: Depending on after_bootmem is not correct in] Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
#ifndef __LINUX_SWIOTLB_XEN_H
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#define __LINUX_SWIOTLB_XEN_H
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#include <linux/swiotlb.h>
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extern int xen_swiotlb_init(int verbose, bool early);
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extern void
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*xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
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dma_addr_t *dma_handle, gfp_t flags,
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struct dma_attrs *attrs);
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extern void
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xen_swiotlb_free_coherent(struct device *hwdev, size_t size,
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void *vaddr, dma_addr_t dma_handle,
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struct dma_attrs *attrs);
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extern dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size,
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enum dma_data_direction dir,
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struct dma_attrs *attrs);
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extern void xen_swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
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size_t size, enum dma_data_direction dir,
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struct dma_attrs *attrs);
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/*
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extern int
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xen_swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
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enum dma_data_direction dir);
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extern void
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xen_swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
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enum dma_data_direction dir);
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*/
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extern int
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xen_swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
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int nelems, enum dma_data_direction dir,
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struct dma_attrs *attrs);
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extern void
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xen_swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
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int nelems, enum dma_data_direction dir,
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struct dma_attrs *attrs);
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extern void
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xen_swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
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size_t size, enum dma_data_direction dir);
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extern void
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xen_swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
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int nelems, enum dma_data_direction dir);
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extern void
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xen_swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
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size_t size, enum dma_data_direction dir);
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extern void
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xen_swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
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int nelems, enum dma_data_direction dir);
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extern int
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xen_swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
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extern int
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xen_swiotlb_dma_supported(struct device *hwdev, u64 mask);
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#endif /* __LINUX_SWIOTLB_XEN_H */
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