1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #ifndef _LINUXKPI_LINUX_IO_MAPPING_H_ 31 #define _LINUXKPI_LINUX_IO_MAPPING_H_ 32 33 #include <sys/types.h> 34 #include <machine/vm.h> 35 36 #include <linux/types.h> 37 #include <linux/io.h> 38 #include <linux/mm.h> 39 #include <linux/slab.h> 40 41 struct io_mapping { 42 unsigned long base; 43 unsigned long size; 44 void *mem; 45 vm_memattr_t attr; 46 }; 47 48 struct io_mapping *io_mapping_create_wc(resource_size_t base, unsigned long size); 49 50 static inline struct io_mapping * 51 io_mapping_init_wc(struct io_mapping *mapping, resource_size_t base, 52 unsigned long size) 53 { 54 55 mapping->base = base; 56 mapping->size = size; 57 #ifdef VM_MEMATTR_WRITE_COMBINING 58 mapping->mem = ioremap_wc(base, size); 59 mapping->attr = VM_MEMATTR_WRITE_COMBINING; 60 #else 61 mapping->mem = ioremap_nocache(base, size); 62 mapping->attr = VM_MEMATTR_UNCACHEABLE; 63 #endif 64 return (mapping); 65 } 66 67 static inline void 68 io_mapping_fini(struct io_mapping *mapping) 69 { 70 71 iounmap(mapping->mem); 72 } 73 74 static inline void 75 io_mapping_free(struct io_mapping *mapping) 76 { 77 78 io_mapping_fini(mapping->mem); 79 kfree(mapping); 80 } 81 82 static inline void * 83 io_mapping_map_atomic_wc(struct io_mapping *mapping, unsigned long offset) 84 { 85 86 return ((char *)mapping->mem + offset); 87 } 88 89 static inline void 90 io_mapping_unmap_atomic(void *vaddr) 91 { 92 } 93 94 static inline void * 95 io_mapping_map_local_wc(struct io_mapping *mapping, unsigned long offset) 96 { 97 98 return (io_mapping_map_atomic_wc(mapping, offset)); 99 } 100 101 static inline void 102 io_mapping_unmap_local(void *vaddr __unused) 103 { 104 } 105 106 static inline void * 107 io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset, 108 unsigned long size) 109 { 110 111 return ((char *)mapping->mem + offset); 112 } 113 114 int lkpi_io_mapping_map_user(struct io_mapping *iomap, 115 struct vm_area_struct *vma, unsigned long addr, unsigned long pfn, 116 unsigned long size); 117 118 static inline int 119 io_mapping_map_user(struct io_mapping *iomap, struct vm_area_struct *vma, 120 unsigned long addr, unsigned long pfn, unsigned long size) 121 { 122 return (lkpi_io_mapping_map_user(iomap, vma, addr, pfn, size)); 123 } 124 125 static inline void 126 io_mapping_unmap(void *vaddr) 127 { 128 } 129 130 #endif /* _LINUXKPI_LINUX_IO_MAPPING_H_ */ 131