1 /* 2 * Copyright (c) 2013, Cisco Systems, Inc. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 * 32 */ 33 34 #ifndef USNIC_UIOM_H_ 35 #define USNIC_UIOM_H_ 36 37 #include <linux/list.h> 38 #include <linux/scatterlist.h> 39 40 #include "usnic_uiom_interval_tree.h" 41 42 struct ib_ucontext; 43 44 #define USNIC_UIOM_READ (1) 45 #define USNIC_UIOM_WRITE (2) 46 47 #define USNIC_UIOM_MAX_PD_CNT (1000) 48 #define USNIC_UIOM_MAX_MR_CNT (1000000) 49 #define USNIC_UIOM_MAX_MR_SIZE (~0UL) 50 #define USNIC_UIOM_PAGE_SIZE (PAGE_SIZE) 51 52 struct usnic_uiom_dev { 53 struct device *dev; 54 struct list_head link; 55 }; 56 57 struct usnic_uiom_pd { 58 struct iommu_domain *domain; 59 spinlock_t lock; 60 struct rb_root_cached root; 61 struct list_head devs; 62 int dev_cnt; 63 }; 64 65 struct usnic_uiom_reg { 66 struct usnic_uiom_pd *pd; 67 unsigned long va; 68 size_t length; 69 int offset; 70 int page_size; 71 int writable; 72 struct list_head chunk_list; 73 struct work_struct work; 74 struct mm_struct *owning_mm; 75 }; 76 77 struct usnic_uiom_chunk { 78 struct list_head list; 79 int nents; 80 struct scatterlist page_list[]; 81 }; 82 83 struct usnic_uiom_pd *usnic_uiom_alloc_pd(struct device *dev); 84 void usnic_uiom_dealloc_pd(struct usnic_uiom_pd *pd); 85 int usnic_uiom_attach_dev_to_pd(struct usnic_uiom_pd *pd, struct device *dev); 86 void usnic_uiom_detach_dev_from_pd(struct usnic_uiom_pd *pd, 87 struct device *dev); 88 struct device **usnic_uiom_get_dev_list(struct usnic_uiom_pd *pd); 89 void usnic_uiom_free_dev_list(struct device **devs); 90 struct usnic_uiom_reg *usnic_uiom_reg_get(struct usnic_uiom_pd *pd, 91 unsigned long addr, size_t size, 92 int access, int dmasync); 93 void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr); 94 #endif /* USNIC_UIOM_H_ */ 95