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 #define USNIC_UIOM_READ (1) 43 #define USNIC_UIOM_WRITE (2) 44 45 #define USNIC_UIOM_MAX_PD_CNT (1000) 46 #define USNIC_UIOM_MAX_MR_CNT (1000000) 47 #define USNIC_UIOM_MAX_MR_SIZE (~0UL) 48 #define USNIC_UIOM_PAGE_SIZE (PAGE_SIZE) 49 50 struct usnic_uiom_dev { 51 struct device *dev; 52 struct list_head link; 53 }; 54 55 struct usnic_uiom_pd { 56 struct iommu_domain *domain; 57 spinlock_t lock; 58 struct rb_root rb_root; 59 struct list_head devs; 60 int dev_cnt; 61 }; 62 63 struct usnic_uiom_reg { 64 struct usnic_uiom_pd *pd; 65 unsigned long va; 66 size_t length; 67 int offset; 68 int page_size; 69 int writable; 70 struct list_head chunk_list; 71 struct work_struct work; 72 struct mm_struct *mm; 73 unsigned long diff; 74 }; 75 76 struct usnic_uiom_chunk { 77 struct list_head list; 78 int nents; 79 struct scatterlist page_list[0]; 80 }; 81 82 struct usnic_uiom_pd *usnic_uiom_alloc_pd(void); 83 void usnic_uiom_dealloc_pd(struct usnic_uiom_pd *pd); 84 int usnic_uiom_attach_dev_to_pd(struct usnic_uiom_pd *pd, struct device *dev); 85 void usnic_uiom_detach_dev_from_pd(struct usnic_uiom_pd *pd, 86 struct device *dev); 87 struct device **usnic_uiom_get_dev_list(struct usnic_uiom_pd *pd); 88 void usnic_uiom_free_dev_list(struct device **devs); 89 struct usnic_uiom_reg *usnic_uiom_reg_get(struct usnic_uiom_pd *pd, 90 unsigned long addr, size_t size, 91 int access, int dmasync); 92 void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr, int closing); 93 int usnic_uiom_init(char *drv_name); 94 void usnic_uiom_fini(void); 95 #endif /* USNIC_UIOM_H_ */ 96