1*fe267a55SPedro F. Giffuni /*- 2*fe267a55SPedro F. Giffuni * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0 3*fe267a55SPedro F. Giffuni * 4aa0a1e58SJeff Roberson * Copyright (c) 2007 Cisco Systems. All rights reserved. 5aa0a1e58SJeff Roberson * 6aa0a1e58SJeff Roberson * This software is available to you under a choice of one of two 7aa0a1e58SJeff Roberson * licenses. You may choose to be licensed under the terms of the GNU 8aa0a1e58SJeff Roberson * General Public License (GPL) Version 2, available from the file 9aa0a1e58SJeff Roberson * COPYING in the main directory of this source tree, or the 10aa0a1e58SJeff Roberson * OpenIB.org BSD license below: 11aa0a1e58SJeff Roberson * 12aa0a1e58SJeff Roberson * Redistribution and use in source and binary forms, with or 13aa0a1e58SJeff Roberson * without modification, are permitted provided that the following 14aa0a1e58SJeff Roberson * conditions are met: 15aa0a1e58SJeff Roberson * 16aa0a1e58SJeff Roberson * - Redistributions of source code must retain the above 17aa0a1e58SJeff Roberson * copyright notice, this list of conditions and the following 18aa0a1e58SJeff Roberson * disclaimer. 19aa0a1e58SJeff Roberson * 20aa0a1e58SJeff Roberson * - Redistributions in binary form must reproduce the above 21aa0a1e58SJeff Roberson * copyright notice, this list of conditions and the following 22aa0a1e58SJeff Roberson * disclaimer in the documentation and/or other materials 23aa0a1e58SJeff Roberson * provided with the distribution. 24aa0a1e58SJeff Roberson * 25aa0a1e58SJeff Roberson * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 26aa0a1e58SJeff Roberson * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 27aa0a1e58SJeff Roberson * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 28aa0a1e58SJeff Roberson * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 29aa0a1e58SJeff Roberson * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 30aa0a1e58SJeff Roberson * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 31aa0a1e58SJeff Roberson * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 32aa0a1e58SJeff Roberson * SOFTWARE. 33aa0a1e58SJeff Roberson */ 34aa0a1e58SJeff Roberson 35aa0a1e58SJeff Roberson #ifndef IB_UMEM_H 36aa0a1e58SJeff Roberson #define IB_UMEM_H 37aa0a1e58SJeff Roberson 38aa0a1e58SJeff Roberson #include <linux/list.h> 39aa0a1e58SJeff Roberson #include <linux/scatterlist.h> 40aa0a1e58SJeff Roberson #include <linux/workqueue.h> 41aa0a1e58SJeff Roberson 42aa0a1e58SJeff Roberson struct ib_ucontext; 43478d3005SHans Petter Selasky struct ib_umem_odp; 44aa0a1e58SJeff Roberson 45aa0a1e58SJeff Roberson struct ib_umem { 46aa0a1e58SJeff Roberson struct ib_ucontext *context; 47aa0a1e58SJeff Roberson size_t length; 48478d3005SHans Petter Selasky unsigned long address; 49aa0a1e58SJeff Roberson int page_size; 50aa0a1e58SJeff Roberson int writable; 51aa0a1e58SJeff Roberson struct work_struct work; 52478d3005SHans Petter Selasky pid_t pid; 53478d3005SHans Petter Selasky struct mm_struct *mm; 54aa0a1e58SJeff Roberson unsigned long diff; 55478d3005SHans Petter Selasky struct ib_umem_odp *odp_data; 56b5c1e0cbSHans Petter Selasky struct sg_table sg_head; 57aa0a1e58SJeff Roberson int nmap; 58b5c1e0cbSHans Petter Selasky int npages; 59aa0a1e58SJeff Roberson }; 60aa0a1e58SJeff Roberson 61478d3005SHans Petter Selasky /* Returns the offset of the umem start relative to the first page. */ 62478d3005SHans Petter Selasky static inline int ib_umem_offset(struct ib_umem *umem) 63478d3005SHans Petter Selasky { 64478d3005SHans Petter Selasky return umem->address & ((unsigned long)umem->page_size - 1); 65478d3005SHans Petter Selasky } 66478d3005SHans Petter Selasky 67478d3005SHans Petter Selasky /* Returns the first page of an ODP umem. */ 68478d3005SHans Petter Selasky static inline unsigned long ib_umem_start(struct ib_umem *umem) 69478d3005SHans Petter Selasky { 70478d3005SHans Petter Selasky return umem->address - ib_umem_offset(umem); 71478d3005SHans Petter Selasky } 72478d3005SHans Petter Selasky 73478d3005SHans Petter Selasky /* Returns the address of the page after the last one of an ODP umem. */ 74478d3005SHans Petter Selasky static inline unsigned long ib_umem_end(struct ib_umem *umem) 75478d3005SHans Petter Selasky { 76478d3005SHans Petter Selasky return PAGE_ALIGN(umem->address + umem->length); 77478d3005SHans Petter Selasky } 78478d3005SHans Petter Selasky 79478d3005SHans Petter Selasky static inline size_t ib_umem_num_pages(struct ib_umem *umem) 80478d3005SHans Petter Selasky { 81478d3005SHans Petter Selasky return (ib_umem_end(umem) - ib_umem_start(umem)) >> PAGE_SHIFT; 82478d3005SHans Petter Selasky } 83478d3005SHans Petter Selasky 84478d3005SHans Petter Selasky #ifdef CONFIG_INFINIBAND_USER_MEM 85478d3005SHans Petter Selasky 86aa0a1e58SJeff Roberson struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, 87aa0a1e58SJeff Roberson size_t size, int access, int dmasync); 88aa0a1e58SJeff Roberson void ib_umem_release(struct ib_umem *umem); 89aa0a1e58SJeff Roberson int ib_umem_page_count(struct ib_umem *umem); 90478d3005SHans Petter Selasky int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset, 91478d3005SHans Petter Selasky size_t length); 92478d3005SHans Petter Selasky 93478d3005SHans Petter Selasky #else /* CONFIG_INFINIBAND_USER_MEM */ 94478d3005SHans Petter Selasky 95478d3005SHans Petter Selasky #include <linux/err.h> 96478d3005SHans Petter Selasky 97478d3005SHans Petter Selasky static inline struct ib_umem *ib_umem_get(struct ib_ucontext *context, 98478d3005SHans Petter Selasky unsigned long addr, size_t size, 99478d3005SHans Petter Selasky int access, int dmasync) { 100478d3005SHans Petter Selasky return ERR_PTR(-EINVAL); 101478d3005SHans Petter Selasky } 102478d3005SHans Petter Selasky static inline void ib_umem_release(struct ib_umem *umem) { } 103478d3005SHans Petter Selasky static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; } 104478d3005SHans Petter Selasky static inline int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset, 105478d3005SHans Petter Selasky size_t length) { 106478d3005SHans Petter Selasky return -EINVAL; 107478d3005SHans Petter Selasky } 108478d3005SHans Petter Selasky #endif /* CONFIG_INFINIBAND_USER_MEM */ 109aa0a1e58SJeff Roberson 110aa0a1e58SJeff Roberson #endif /* IB_UMEM_H */ 111