Edit File: ib_umem.h
/* * 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. */ #ifndef IB_UMEM_H #define IB_UMEM_H #include <linux/list.h> #include <linux/scatterlist.h> #include <linux/workqueue.h> struct ib_ucontext; struct ib_umem_odp; struct ib_umem { struct ib_ucontext *context; struct mm_struct *owning_mm; size_t length; unsigned long address; int page_shift; u32 writable : 1; u32 hugetlb : 1; u32 is_odp : 1; struct work_struct work; struct sg_table sg_head; int nmap; int npages; }; /* 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 & (BIT(umem->page_shift) - 1); } /* Returns the first page of an ODP umem. */ static inline unsigned long ib_umem_start(struct ib_umem *umem) { return umem->address - ib_umem_offset(umem); } /* Returns the address of the page after the last one of an ODP umem. */ static inline unsigned long ib_umem_end(struct ib_umem *umem) { return ALIGN(umem->address + umem->length, BIT(umem->page_shift)); } static inline size_t ib_umem_num_pages(struct ib_umem *umem) { return (ib_umem_end(umem) - ib_umem_start(umem)) >> umem->page_shift; } #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); 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); #else /* CONFIG_INFINIBAND_USER_MEM */ #include <linux/err.h> static inline struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, size_t size, int access, int dmasync) { return ERR_PTR(-EINVAL); } 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 -EINVAL; } #endif /* CONFIG_INFINIBAND_USER_MEM */ #endif /* IB_UMEM_H */