/* * Copyright (C) 2014-2015 ARM Ltd. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #ifndef __DMA_IOMMU_H #define __DMA_IOMMU_H #ifdef __KERNEL__ #include <asm/errno.h> #ifdef CONFIG_IOMMU_DMA #include <linux/iommu.h> int iommu_dma_init(void); /* Domain management interface for IOMMU drivers */ int iommu_get_dma_cookie(struct iommu_domain *domain); void iommu_put_dma_cookie(struct iommu_domain *domain); /* Setup call for arch DMA mapping code */ int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base, u64 size); /* General helpers for DMA-API <-> IOMMU-API interaction */ int dma_direction_to_prot(enum dma_data_direction dir, bool coherent); /* * These implement the bulk of the relevant DMA mapping callbacks, but require * the arch code to take care of attributes and cache maintenance */ struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp, int prot, dma_addr_t *handle, void (*flush_page)(struct device *, const void *, phys_addr_t)); void iommu_dma_free(struct device *dev, struct page **pages, size_t size, dma_addr_t *handle); int iommu_dma_mmap(struct page **pages, size_t size, struct vm_area_struct *vma); dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, int prot); int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, int prot); /* * Arch code with no special attribute handling may use these * directly as DMA mapping callbacks for simplicity */ void iommu_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size, enum dma_data_direction dir, struct dma_attrs *attrs); void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir, struct dma_attrs *attrs); int iommu_dma_supported(struct device *dev, u64 mask); int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr); #else struct iommu_domain; static inline int iommu_dma_init(void) { return 0; } static inline int iommu_get_dma_cookie(struct iommu_domain *domain) { return -ENODEV; } static inline void iommu_put_dma_cookie(struct iommu_domain *domain) { } #endif /* CONFIG_IOMMU_DMA */ #endif /* __KERNEL__ */ #endif /* __DMA_IOMMU_H */