diff options
Diffstat (limited to 'include/rdma/ib_umem.h')
| -rw-r--r-- | include/rdma/ib_umem.h | 259 |
1 files changed, 209 insertions, 50 deletions
diff --git a/include/rdma/ib_umem.h b/include/rdma/ib_umem.h index 9ee0d2e51b16..0a8e092c0ea8 100644 --- a/include/rdma/ib_umem.h +++ b/include/rdma/ib_umem.h @@ -1,33 +1,7 @@ +/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */ /* * Copyright (c) 2007 Cisco Systems. All rights reserved. - * - * This software is available to you under a choice of one of two - * licenses. You may choose to be licensed under the terms of the GNU - * General Public License (GPL) Version 2, available from the file - * COPYING in the main directory of this source tree, or the - * OpenIB.org BSD license below: - * - * Redistribution and use in source and binary forms, with or - * without modification, are permitted provided that the following - * conditions are met: - * - * - Redistributions of source code must retain the above - * copyright notice, this list of conditions and the following - * disclaimer. - * - * - Redistributions in binary form must reproduce the above - * copyright notice, this list of conditions and the following - * disclaimer in the documentation and/or other materials - * provided with the distribution. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, - * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF - * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND - * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS - * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN - * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN - * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE - * SOFTWARE. + * Copyright (c) 2020 Intel Corporation. All rights reserved. */ #ifndef IB_UMEM_H @@ -36,48 +10,233 @@ #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_ucontext *context; + struct ib_device *ibdev; + struct mm_struct *owning_mm; + u64 iova; size_t length; - int offset; - int page_size; - int writable; - int hugetlb; - struct list_head chunk_list; - struct work_struct work; - struct mm_struct *mm; - unsigned long diff; + unsigned long address; + u32 writable : 1; + u32 is_odp : 1; + u32 is_dmabuf : 1; + struct sg_append_table sgt_append; }; -struct ib_umem_chunk { - struct list_head list; - int nents; - int nmap; - struct scatterlist page_list[0]; +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; + u8 revoked : 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 dma_addr_t ib_umem_start_dma_addr(struct ib_umem *umem) +{ + return sg_dma_address(umem->sgt_append.sgt.sgl) + ib_umem_offset(umem); +} + +static inline unsigned long ib_umem_dma_offset(struct ib_umem *umem, + unsigned long pgsz) +{ + return ib_umem_start_dma_addr(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_ucontext *context, unsigned long addr, - size_t size, int access, int dmasync); +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_page_count(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) +{ + dma_addr_t dma_addr; + + dma_addr = ib_umem_start_dma_addr(umem); + return ib_umem_find_best_pgsz(umem, pgsz_bitmap, + dma_addr & pgoff_bitmask); +} + +static inline bool ib_umem_is_contiguous(struct ib_umem *umem) +{ + dma_addr_t dma_addr; + unsigned long pgsz; + + /* + * Select the smallest aligned page that can contain the whole umem if + * it was contiguous. + */ + dma_addr = ib_umem_start_dma_addr(umem); + pgsz = roundup_pow_of_two((dma_addr ^ (umem->length - 1 + dma_addr)) + 1); + return !!ib_umem_find_best_pgoff(umem, pgsz, U64_MAX); +} + +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); +struct ib_umem_dmabuf * +ib_umem_dmabuf_get_pinned_with_dma_device(struct ib_device *device, + struct device *dma_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); +void ib_umem_dmabuf_revoke(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_ucontext *context, +static inline struct ib_umem *ib_umem_get(struct ib_device *device, unsigned long addr, size_t size, - int access, int dmasync) { - return ERR_PTR(-EINVAL); + int access) +{ + return ERR_PTR(-EOPNOTSUPP); } static inline void ib_umem_release(struct ib_umem *umem) { } -static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; } +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); +} -#endif /* CONFIG_INFINIBAND_USER_MEM */ +static inline struct ib_umem_dmabuf * +ib_umem_dmabuf_get_pinned_with_dma_device(struct ib_device *device, + struct device *dma_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) { } +static inline void ib_umem_dmabuf_revoke(struct ib_umem_dmabuf *umem_dmabuf) {} + +#endif /* CONFIG_INFINIBAND_USER_MEM */ #endif /* IB_UMEM_H */ |