1 /* 2 * Copyright (c) 2013, Cisco Systems, Inc. All rights reserved. 3 * 4 * This program is free software; you may redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; version 2 of the License. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 15 * SOFTWARE. 16 * 17 */ 18 19 #ifndef USNIC_UIOM_H_ 20 #define USNIC_UIOM_H_ 21 22 #include <linux/list.h> 23 #include <linux/scatterlist.h> 24 25 #include "usnic_uiom_interval_tree.h" 26 27 #define USNIC_UIOM_READ (1) 28 #define USNIC_UIOM_WRITE (2) 29 30 #define USNIC_UIOM_MAX_PD_CNT (1000) 31 #define USNIC_UIOM_MAX_MR_CNT (1000000) 32 #define USNIC_UIOM_MAX_MR_SIZE (~0UL) 33 #define USNIC_UIOM_PAGE_SIZE (PAGE_SIZE) 34 35 struct usnic_uiom_dev { 36 struct device *dev; 37 struct list_head link; 38 }; 39 40 struct usnic_uiom_pd { 41 struct iommu_domain *domain; 42 spinlock_t lock; 43 struct rb_root rb_root; 44 struct list_head devs; 45 int dev_cnt; 46 }; 47 48 struct usnic_uiom_reg { 49 struct usnic_uiom_pd *pd; 50 unsigned long va; 51 size_t length; 52 int offset; 53 int page_size; 54 int writable; 55 struct list_head chunk_list; 56 struct work_struct work; 57 struct mm_struct *mm; 58 unsigned long diff; 59 }; 60 61 struct usnic_uiom_chunk { 62 struct list_head list; 63 int nents; 64 struct scatterlist page_list[0]; 65 }; 66 67 struct usnic_uiom_pd *usnic_uiom_alloc_pd(void); 68 void usnic_uiom_dealloc_pd(struct usnic_uiom_pd *pd); 69 int usnic_uiom_attach_dev_to_pd(struct usnic_uiom_pd *pd, struct device *dev); 70 void usnic_uiom_detach_dev_from_pd(struct usnic_uiom_pd *pd, 71 struct device *dev); 72 struct device **usnic_uiom_get_dev_list(struct usnic_uiom_pd *pd); 73 void usnic_uiom_free_dev_list(struct device **devs); 74 struct usnic_uiom_reg *usnic_uiom_reg_get(struct usnic_uiom_pd *pd, 75 unsigned long addr, size_t size, 76 int access, int dmasync); 77 void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr, int closing); 78 int usnic_uiom_init(char *drv_name); 79 void usnic_uiom_fini(void); 80 #endif /* USNIC_UIOM_H_ */ 81