io-mapping.h revision 1.2.10.3
1 1.2.10.2 tls /* $NetBSD: io-mapping.h,v 1.2.10.3 2017/12/03 11:37:59 jdolecek Exp $ */ 2 1.2.10.2 tls 3 1.2.10.2 tls /*- 4 1.2.10.2 tls * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 1.2.10.2 tls * All rights reserved. 6 1.2.10.2 tls * 7 1.2.10.2 tls * This code is derived from software contributed to The NetBSD Foundation 8 1.2.10.2 tls * by Taylor R. Campbell. 9 1.2.10.2 tls * 10 1.2.10.2 tls * Redistribution and use in source and binary forms, with or without 11 1.2.10.2 tls * modification, are permitted provided that the following conditions 12 1.2.10.2 tls * are met: 13 1.2.10.2 tls * 1. Redistributions of source code must retain the above copyright 14 1.2.10.2 tls * notice, this list of conditions and the following disclaimer. 15 1.2.10.2 tls * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.10.2 tls * notice, this list of conditions and the following disclaimer in the 17 1.2.10.2 tls * documentation and/or other materials provided with the distribution. 18 1.2.10.2 tls * 19 1.2.10.2 tls * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.2.10.2 tls * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.2.10.2 tls * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.2.10.2 tls * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.2.10.2 tls * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.2.10.2 tls * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.2.10.2 tls * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.2.10.2 tls * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.2.10.2 tls * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.2.10.2 tls * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.2.10.2 tls * POSSIBILITY OF SUCH DAMAGE. 30 1.2.10.2 tls */ 31 1.2.10.2 tls 32 1.2.10.2 tls #ifndef _LINUX_IO_MAPPING_H_ 33 1.2.10.2 tls #define _LINUX_IO_MAPPING_H_ 34 1.2.10.2 tls 35 1.2.10.3 jdolecek #include <sys/param.h> 36 1.2.10.2 tls #include <sys/bus.h> 37 1.2.10.2 tls #include <sys/kmem.h> 38 1.2.10.2 tls #include <sys/systm.h> 39 1.2.10.3 jdolecek #include <sys/mman.h> 40 1.2.10.3 jdolecek 41 1.2.10.3 jdolecek #include <uvm/uvm_extern.h> 42 1.2.10.2 tls 43 1.2.10.2 tls struct io_mapping { 44 1.2.10.2 tls bus_space_tag_t diom_bst; 45 1.2.10.2 tls bus_addr_t diom_addr; 46 1.2.10.2 tls bus_size_t diom_size; 47 1.2.10.3 jdolecek vaddr_t diom_va; 48 1.2.10.3 jdolecek bool diom_mapped; 49 1.2.10.2 tls }; 50 1.2.10.2 tls 51 1.2.10.2 tls static inline struct io_mapping * 52 1.2.10.2 tls bus_space_io_mapping_create_wc(bus_space_tag_t bst, bus_addr_t addr, 53 1.2.10.2 tls bus_size_t size) 54 1.2.10.2 tls { 55 1.2.10.3 jdolecek struct io_mapping *mapping; 56 1.2.10.3 jdolecek bus_size_t offset; 57 1.2.10.3 jdolecek 58 1.2.10.3 jdolecek KASSERT(PAGE_SIZE <= size); 59 1.2.10.3 jdolecek KASSERT(0 == (size & (PAGE_SIZE - 1))); 60 1.2.10.3 jdolecek KASSERT(__type_fit(off_t, size)); 61 1.2.10.3 jdolecek 62 1.2.10.3 jdolecek /* 63 1.2.10.3 jdolecek * XXX For x86: Reserve the region (bus_space_reserve) and set 64 1.2.10.3 jdolecek * an MTRR to make it write-combining. Doesn't matter if we 65 1.2.10.3 jdolecek * have PAT and we use pmap_kenter_pa, but matters if we don't 66 1.2.10.3 jdolecek * have PAT or if we later make this use direct map. 67 1.2.10.3 jdolecek */ 68 1.2.10.3 jdolecek 69 1.2.10.3 jdolecek /* Make sure the region is mappable. */ 70 1.2.10.3 jdolecek for (offset = 0; offset < size; offset += PAGE_SIZE) { 71 1.2.10.3 jdolecek if (bus_space_mmap(bst, addr, offset, PROT_READ|PROT_WRITE, 72 1.2.10.3 jdolecek BUS_SPACE_MAP_LINEAR|BUS_SPACE_MAP_PREFETCHABLE) 73 1.2.10.3 jdolecek == (paddr_t)-1) 74 1.2.10.3 jdolecek return NULL; 75 1.2.10.3 jdolecek } 76 1.2.10.3 jdolecek 77 1.2.10.3 jdolecek /* Create a mapping record. */ 78 1.2.10.3 jdolecek mapping = kmem_alloc(sizeof(*mapping), KM_SLEEP); 79 1.2.10.2 tls mapping->diom_bst = bst; 80 1.2.10.2 tls mapping->diom_addr = addr; 81 1.2.10.2 tls mapping->diom_size = size; 82 1.2.10.3 jdolecek mapping->diom_mapped = false; 83 1.2.10.3 jdolecek 84 1.2.10.3 jdolecek /* Allocate kva for one page. */ 85 1.2.10.3 jdolecek mapping->diom_va = uvm_km_alloc(kernel_map, PAGE_SIZE, PAGE_SIZE, 86 1.2.10.3 jdolecek UVM_KMF_VAONLY | UVM_KMF_WAITVA); 87 1.2.10.3 jdolecek KASSERT(mapping->diom_va != 0); 88 1.2.10.2 tls 89 1.2.10.2 tls return mapping; 90 1.2.10.2 tls } 91 1.2.10.2 tls 92 1.2.10.2 tls static inline void 93 1.2.10.2 tls io_mapping_free(struct io_mapping *mapping) 94 1.2.10.2 tls { 95 1.2.10.2 tls 96 1.2.10.3 jdolecek KASSERT(!mapping->diom_mapped); 97 1.2.10.3 jdolecek 98 1.2.10.3 jdolecek uvm_km_free(kernel_map, mapping->diom_va, PAGE_SIZE, UVM_KMF_VAONLY); 99 1.2.10.2 tls kmem_free(mapping, sizeof(*mapping)); 100 1.2.10.2 tls } 101 1.2.10.2 tls 102 1.2.10.2 tls static inline void * 103 1.2.10.2 tls io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset) 104 1.2.10.2 tls { 105 1.2.10.3 jdolecek paddr_t cookie; 106 1.2.10.2 tls 107 1.2.10.3 jdolecek KASSERT(0 == (offset & (PAGE_SIZE - 1))); 108 1.2.10.3 jdolecek KASSERT(PAGE_SIZE <= mapping->diom_size); 109 1.2.10.3 jdolecek KASSERT(offset <= (mapping->diom_size - PAGE_SIZE)); 110 1.2.10.3 jdolecek KASSERT(__type_fit(off_t, offset)); 111 1.2.10.3 jdolecek KASSERT(!mapping->diom_mapped); 112 1.2.10.3 jdolecek 113 1.2.10.3 jdolecek cookie = bus_space_mmap(mapping->diom_bst, mapping->diom_addr, offset, 114 1.2.10.3 jdolecek PROT_READ|PROT_WRITE, 115 1.2.10.3 jdolecek BUS_SPACE_MAP_LINEAR|BUS_SPACE_MAP_PREFETCHABLE); 116 1.2.10.3 jdolecek KASSERT(cookie != (paddr_t)-1); 117 1.2.10.3 jdolecek 118 1.2.10.3 jdolecek pmap_kenter_pa(mapping->diom_va, pmap_phys_address(cookie), 119 1.2.10.3 jdolecek PROT_READ|PROT_WRITE, pmap_mmap_flags(cookie)); 120 1.2.10.3 jdolecek pmap_update(pmap_kernel()); 121 1.2.10.2 tls 122 1.2.10.3 jdolecek mapping->diom_mapped = true; 123 1.2.10.3 jdolecek return (void *)mapping->diom_va; 124 1.2.10.2 tls } 125 1.2.10.2 tls 126 1.2.10.2 tls static inline void 127 1.2.10.3 jdolecek io_mapping_unmap(struct io_mapping *mapping, void *ptr __diagused) 128 1.2.10.2 tls { 129 1.2.10.2 tls 130 1.2.10.3 jdolecek KASSERT(mapping->diom_mapped); 131 1.2.10.3 jdolecek KASSERT(mapping->diom_va == (vaddr_t)ptr); 132 1.2.10.3 jdolecek 133 1.2.10.3 jdolecek pmap_kremove(mapping->diom_va, PAGE_SIZE); 134 1.2.10.3 jdolecek pmap_update(pmap_kernel()); 135 1.2.10.3 jdolecek 136 1.2.10.3 jdolecek mapping->diom_mapped = false; 137 1.2.10.2 tls } 138 1.2.10.2 tls 139 1.2.10.2 tls static inline void * 140 1.2.10.2 tls io_mapping_map_atomic_wc(struct io_mapping *mapping, unsigned long offset) 141 1.2.10.2 tls { 142 1.2.10.3 jdolecek 143 1.2.10.2 tls return io_mapping_map_wc(mapping, offset); 144 1.2.10.2 tls } 145 1.2.10.2 tls 146 1.2.10.2 tls static inline void 147 1.2.10.3 jdolecek io_mapping_unmap_atomic(struct io_mapping *mapping, void *ptr) 148 1.2.10.2 tls { 149 1.2.10.3 jdolecek 150 1.2.10.3 jdolecek io_mapping_unmap(mapping, ptr); 151 1.2.10.2 tls } 152 1.2.10.2 tls 153 1.2.10.2 tls #endif /* _LINUX_IO_MAPPING_H_ */ 154
Indexes created Wed Oct 01 18:09:54 GMT 2025