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f7326196a7
Introduce new DMA mapping functions dma_map_phys() and dma_unmap_phys() that operate directly on physical addresses instead of page+offset parameters. This provides a more efficient interface for drivers that already have physical addresses available. The new functions are implemented as the primary mapping layer, with the existing dma_map_page_attrs()/dma_map_resource() and dma_unmap_page_attrs()/dma_unmap_resource() functions converted to simple wrappers around the phys-based implementations. In case dma_map_page_attrs(), the struct page is converted to physical address with help of page_to_phys() function and dma_map_resource() provides physical address as is together with addition of DMA_ATTR_MMIO attribute. The old page-based API is preserved in mapping.c to ensure that existing code won't be affected by changing EXPORT_SYMBOL to EXPORT_SYMBOL_GPL variant for dma_*map_phys(). Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Reviewed-by: Keith Busch <kbusch@kernel.org> Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Link: https://lore.kernel.org/r/54cc52af91777906bbe4a386113437ba0bcfba9c.1757423202.git.leonro@nvidia.com
65 lines
2.7 KiB
C
65 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2024, NVIDIA CORPORATION & AFFILIATES. All rights reserved
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*
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* DMA operations that map physical memory through IOMMU.
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*/
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#ifndef _LINUX_IOMMU_DMA_H
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#define _LINUX_IOMMU_DMA_H
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#include <linux/dma-direction.h>
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#ifdef CONFIG_IOMMU_DMA
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static inline bool use_dma_iommu(struct device *dev)
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{
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return dev->dma_iommu;
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}
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#else
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static inline bool use_dma_iommu(struct device *dev)
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{
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return false;
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}
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#endif /* CONFIG_IOMMU_DMA */
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dma_addr_t iommu_dma_map_phys(struct device *dev, phys_addr_t phys, size_t size,
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enum dma_data_direction dir, unsigned long attrs);
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void iommu_dma_unmap_phys(struct device *dev, dma_addr_t dma_handle,
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size_t size, enum dma_data_direction dir, unsigned long attrs);
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int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction dir, unsigned long attrs);
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void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction dir, unsigned long attrs);
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void *iommu_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
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gfp_t gfp, unsigned long attrs);
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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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unsigned long iommu_dma_get_merge_boundary(struct device *dev);
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size_t iommu_dma_opt_mapping_size(void);
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size_t iommu_dma_max_mapping_size(struct device *dev);
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void iommu_dma_free(struct device *dev, size_t size, void *cpu_addr,
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dma_addr_t handle, unsigned long attrs);
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struct sg_table *iommu_dma_alloc_noncontiguous(struct device *dev, size_t size,
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enum dma_data_direction dir, gfp_t gfp, unsigned long attrs);
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void iommu_dma_free_noncontiguous(struct device *dev, size_t size,
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struct sg_table *sgt, enum dma_data_direction dir);
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void *iommu_dma_vmap_noncontiguous(struct device *dev, size_t size,
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struct sg_table *sgt);
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#define iommu_dma_vunmap_noncontiguous(dev, vaddr) \
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vunmap(vaddr);
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int iommu_dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma,
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size_t size, struct sg_table *sgt);
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void iommu_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
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size_t size, enum dma_data_direction dir);
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void iommu_dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
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size_t size, enum dma_data_direction dir);
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void iommu_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sgl,
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int nelems, enum dma_data_direction dir);
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void iommu_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sgl,
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int nelems, enum dma_data_direction dir);
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#endif /* _LINUX_IOMMU_DMA_H */
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