2281bbc545
Currently the IOVA framework automatically applies IOVA alignment to provided IOVAs based on the requested IOVA size and the alignment configs which are enabled. Some clients who don't require any IOVA alignment would benefit from the reduced fragmentation that would result from disabling IOVA alignment. Add support to allow clients to disable IOVA alignment on an IOMMU domain. Change-Id: Ifa6a75576e7a084c443abf38726d790b883f00b3 Signed-off-by: Patrick Daly <pdaly@codeaurora.org> [lmark@codeaurora.org: cleanup change] Signed-off-by: Liam Mark <lmark@codeaurora.org>
131 lines
3.4 KiB
C
131 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2014-2015 ARM Ltd.
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*/
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#ifndef __DMA_IOMMU_H
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#define __DMA_IOMMU_H
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#include <linux/errno.h>
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#include <linux/types.h>
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#ifdef CONFIG_IOMMU_DMA
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#include <linux/dma-mapping.h>
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#include <linux/iommu.h>
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#include <linux/msi.h>
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struct iova_domain;
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/* Domain management interface for IOMMU drivers */
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int iommu_get_dma_cookie(struct iommu_domain *domain);
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int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base);
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void iommu_put_dma_cookie(struct iommu_domain *domain);
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int dma_info_to_prot(enum dma_data_direction dir, bool coherent,
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unsigned long attrs);
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size_t iommu_dma_prepare_map_sg(struct device *dev, struct iova_domain *iovad,
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struct scatterlist *sg, int nents);
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int iommu_dma_finalise_sg(struct device *dev, struct scatterlist *sg,
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int nents, dma_addr_t dma_addr);
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void iommu_dma_invalidate_sg(struct scatterlist *sg, int nents);
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int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma,
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void *cpu_addr, dma_addr_t dma_addr, size_t size,
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unsigned long attrs);
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int iommu_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
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void *cpu_addr, dma_addr_t dma_addr, size_t size,
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unsigned long attrs);
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/* Setup call for arch DMA mapping code */
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void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 size);
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/* The DMA API isn't _quite_ the whole story, though... */
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/*
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* iommu_dma_prepare_msi() - Map the MSI page in the IOMMU device
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*
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* The MSI page will be stored in @desc.
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*
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* Return: 0 on success otherwise an error describing the failure.
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*/
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int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr);
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/* Update the MSI message if required. */
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void iommu_dma_compose_msi_msg(struct msi_desc *desc,
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struct msi_msg *msg);
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void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list);
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int iommu_dma_reserve_iova(struct device *dev, dma_addr_t base,
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u64 size);
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int iommu_dma_enable_best_fit_algo(struct device *dev);
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#ifdef CONFIG_DMA_CONFIGURE_ALIGNMENT
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int iommu_dma_configure_alignment(struct device *dev, bool force_no_align);
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#else /* CONFIG_DMA_CONFIGURE_ALIGNMENT */
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static inline int iommu_dma_configure_alignment(struct device *dev,
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bool force_no_align)
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{
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return -ENOTSUPP;
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}
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#endif
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#else /* CONFIG_IOMMU_DMA */
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struct iommu_domain;
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struct msi_desc;
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struct msi_msg;
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struct device;
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static inline void iommu_setup_dma_ops(struct device *dev, u64 dma_base,
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u64 size)
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{
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}
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static inline int iommu_get_dma_cookie(struct iommu_domain *domain)
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{
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return -ENODEV;
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}
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static inline int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base)
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{
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return -ENODEV;
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}
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static inline void iommu_put_dma_cookie(struct iommu_domain *domain)
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{
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}
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static inline int iommu_dma_prepare_msi(struct msi_desc *desc,
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phys_addr_t msi_addr)
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{
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return 0;
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}
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static inline void iommu_dma_compose_msi_msg(struct msi_desc *desc,
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struct msi_msg *msg)
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{
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}
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static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list)
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{
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}
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static inline int iommu_dma_reserve_iova(struct device *dev, dma_addr_t base,
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u64 size)
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{
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return -ENODEV;
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}
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static inline int iommu_dma_enable_best_fit_algo(struct device *dev)
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{
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return -ENODEV;
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}
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static inline int iommu_dma_configure_alignment(struct device *dev,
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bool force_no_align)
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{
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return -ENODEV;
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}
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#endif /* CONFIG_IOMMU_DMA */
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#endif /* __DMA_IOMMU_H */
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