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usr
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linux-headers-6.8.0-36-generic
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include
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rdma
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ib_umem.h
/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */ /* * Copyright (c) 2007 Cisco Systems. All rights reserved. * Copyright (c) 2020 Intel Corporation. All rights reserved. */ #ifndef IB_UMEM_H #define IB_UMEM_H #include <linux/list.h> #include <linux/scatterlist.h> #include <linux/workqueue.h> #include <rdma/ib_verbs.h> struct ib_ucontext; struct ib_umem_odp; struct dma_buf_attach_ops; struct ib_umem { struct ib_device *ibdev; struct mm_struct *owning_mm; u64 iova; size_t length; unsigned long address; u32 writable : 1; u32 is_odp : 1; u32 is_dmabuf : 1; struct sg_append_table sgt_append; }; struct ib_umem_dmabuf { struct ib_umem umem; struct dma_buf_attachment *attach; struct sg_table *sgt; struct scatterlist *first_sg; struct scatterlist *last_sg; unsigned long first_sg_offset; unsigned long last_sg_trim; void *private; u8 pinned : 1; }; static inline struct ib_umem_dmabuf *to_ib_umem_dmabuf(struct ib_umem *umem) { return container_of(umem, struct ib_umem_dmabuf, umem); } /* Returns the offset of the umem start relative to the first page. */ static inline int ib_umem_offset(struct ib_umem *umem) { return umem->address & ~PAGE_MASK; } static inline unsigned long ib_umem_dma_offset(struct ib_umem *umem, unsigned long pgsz) { return (sg_dma_address(umem->sgt_append.sgt.sgl) + ib_umem_offset(umem)) & (pgsz - 1); } static inline size_t ib_umem_num_dma_blocks(struct ib_umem *umem, unsigned long pgsz) { return (size_t)((ALIGN(umem->iova + umem->length, pgsz) - ALIGN_DOWN(umem->iova, pgsz))) / pgsz; } static inline size_t ib_umem_num_pages(struct ib_umem *umem) { return ib_umem_num_dma_blocks(umem, PAGE_SIZE); } static inline void __rdma_umem_block_iter_start(struct ib_block_iter *biter, struct ib_umem *umem, unsigned long pgsz) { __rdma_block_iter_start(biter, umem->sgt_append.sgt.sgl, umem->sgt_append.sgt.nents, pgsz); biter->__sg_advance = ib_umem_offset(umem) & ~(pgsz - 1); biter->__sg_numblocks = ib_umem_num_dma_blocks(umem, pgsz); } static inline bool __rdma_umem_block_iter_next(struct ib_block_iter *biter) { return __rdma_block_iter_next(biter) && biter->__sg_numblocks--; } /** * rdma_umem_for_each_dma_block - iterate over contiguous DMA blocks of the umem * @umem: umem to iterate over * @pgsz: Page size to split the list into * * pgsz must be <= PAGE_SIZE or computed by ib_umem_find_best_pgsz(). The * returned DMA blocks will be aligned to pgsz and span the range: * ALIGN_DOWN(umem->address, pgsz) to ALIGN(umem->address + umem->length, pgsz) * * Performs exactly ib_umem_num_dma_blocks() iterations. */ #define rdma_umem_for_each_dma_block(umem, biter, pgsz) \ for (__rdma_umem_block_iter_start(biter, umem, pgsz); \ __rdma_umem_block_iter_next(biter);) #ifdef CONFIG_INFINIBAND_USER_MEM struct ib_umem *ib_umem_get(struct ib_device *device, unsigned long addr, size_t size, int access); void ib_umem_release(struct ib_umem *umem); int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset, size_t length); unsigned long ib_umem_find_best_pgsz(struct ib_umem *umem, unsigned long pgsz_bitmap, unsigned long virt); /** * ib_umem_find_best_pgoff - Find best HW page size * * @umem: umem struct * @pgsz_bitmap bitmap of HW supported page sizes * @pgoff_bitmask: Mask of bits that can be represented with an offset * * This is very similar to ib_umem_find_best_pgsz() except instead of accepting * an IOVA it accepts a bitmask specifying what address bits can be represented * with a page offset. * * For instance if the HW has multiple page sizes, requires 64 byte alignemnt, * and can support aligned offsets up to 4032 then pgoff_bitmask would be * "111111000000". * * If the pgoff_bitmask requires either alignment in the low bit or an * unavailable page size for the high bits, this function returns 0. */ static inline unsigned long ib_umem_find_best_pgoff(struct ib_umem *umem, unsigned long pgsz_bitmap, u64 pgoff_bitmask) { struct scatterlist *sg = umem->sgt_append.sgt.sgl; dma_addr_t dma_addr; dma_addr = sg_dma_address(sg) + (umem->address & ~PAGE_MASK); return ib_umem_find_best_pgsz(umem, pgsz_bitmap, dma_addr & pgoff_bitmask); } struct ib_umem_dmabuf *ib_umem_dmabuf_get(struct ib_device *device, unsigned long offset, size_t size, int fd, int access, const struct dma_buf_attach_ops *ops); struct ib_umem_dmabuf *ib_umem_dmabuf_get_pinned(struct ib_device *device, unsigned long offset, size_t size, int fd, int access); int ib_umem_dmabuf_map_pages(struct ib_umem_dmabuf *umem_dmabuf); void ib_umem_dmabuf_unmap_pages(struct ib_umem_dmabuf *umem_dmabuf); void ib_umem_dmabuf_release(struct ib_umem_dmabuf *umem_dmabuf); #else /* CONFIG_INFINIBAND_USER_MEM */ #include <linux/err.h> static inline struct ib_umem *ib_umem_get(struct ib_device *device, unsigned long addr, size_t size, int access) { return ERR_PTR(-EOPNOTSUPP); } static inline void ib_umem_release(struct ib_umem *umem) { } static inline int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset, size_t length) { return -EOPNOTSUPP; } static inline unsigned long ib_umem_find_best_pgsz(struct ib_umem *umem, unsigned long pgsz_bitmap, unsigned long virt) { return 0; } static inline unsigned long ib_umem_find_best_pgoff(struct ib_umem *umem, unsigned long pgsz_bitmap, u64 pgoff_bitmask) { return 0; } static inline struct ib_umem_dmabuf *ib_umem_dmabuf_get(struct ib_device *device, unsigned long offset, size_t size, int fd, int access, struct dma_buf_attach_ops *ops) { return ERR_PTR(-EOPNOTSUPP); } static inline struct ib_umem_dmabuf * ib_umem_dmabuf_get_pinned(struct ib_device *device, unsigned long offset, size_t size, int fd, int access) { return ERR_PTR(-EOPNOTSUPP); } static inline int ib_umem_dmabuf_map_pages(struct ib_umem_dmabuf *umem_dmabuf) { return -EOPNOTSUPP; } static inline void ib_umem_dmabuf_unmap_pages(struct ib_umem_dmabuf *umem_dmabuf) { } static inline void ib_umem_dmabuf_release(struct ib_umem_dmabuf *umem_dmabuf) { } #endif /* CONFIG_INFINIBAND_USER_MEM */ #endif /* IB_UMEM_H */
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