1 /* 2 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of version 2 of the GNU General Public License as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 */ 13 #include <linux/memremap.h> 14 #include <linux/rculist.h> 15 #include <linux/export.h> 16 #include <linux/ioport.h> 17 #include <linux/module.h> 18 #include <linux/types.h> 19 #include <linux/pfn_t.h> 20 #include <linux/io.h> 21 #include <linux/mm.h> 22 #include "nfit_test.h" 23 24 static LIST_HEAD(iomap_head); 25 26 static struct iomap_ops { 27 nfit_test_lookup_fn nfit_test_lookup; 28 struct list_head list; 29 } iomap_ops = { 30 .list = LIST_HEAD_INIT(iomap_ops.list), 31 }; 32 33 void nfit_test_setup(nfit_test_lookup_fn lookup) 34 { 35 iomap_ops.nfit_test_lookup = lookup; 36 list_add_rcu(&iomap_ops.list, &iomap_head); 37 } 38 EXPORT_SYMBOL(nfit_test_setup); 39 40 void nfit_test_teardown(void) 41 { 42 list_del_rcu(&iomap_ops.list); 43 synchronize_rcu(); 44 } 45 EXPORT_SYMBOL(nfit_test_teardown); 46 47 static struct nfit_test_resource *__get_nfit_res(resource_size_t resource) 48 { 49 struct iomap_ops *ops; 50 51 ops = list_first_or_null_rcu(&iomap_head, typeof(*ops), list); 52 if (ops) 53 return ops->nfit_test_lookup(resource); 54 return NULL; 55 } 56 57 struct nfit_test_resource *get_nfit_res(resource_size_t resource) 58 { 59 struct nfit_test_resource *res; 60 61 rcu_read_lock(); 62 res = __get_nfit_res(resource); 63 rcu_read_unlock(); 64 65 return res; 66 } 67 EXPORT_SYMBOL(get_nfit_res); 68 69 void __iomem *__nfit_test_ioremap(resource_size_t offset, unsigned long size, 70 void __iomem *(*fallback_fn)(resource_size_t, unsigned long)) 71 { 72 struct nfit_test_resource *nfit_res = get_nfit_res(offset); 73 74 if (nfit_res) 75 return (void __iomem *) nfit_res->buf + offset 76 - nfit_res->res->start; 77 return fallback_fn(offset, size); 78 } 79 80 void __iomem *__wrap_devm_ioremap_nocache(struct device *dev, 81 resource_size_t offset, unsigned long size) 82 { 83 struct nfit_test_resource *nfit_res = get_nfit_res(offset); 84 85 if (nfit_res) 86 return (void __iomem *) nfit_res->buf + offset 87 - nfit_res->res->start; 88 return devm_ioremap_nocache(dev, offset, size); 89 } 90 EXPORT_SYMBOL(__wrap_devm_ioremap_nocache); 91 92 void *__wrap_devm_memremap(struct device *dev, resource_size_t offset, 93 size_t size, unsigned long flags) 94 { 95 struct nfit_test_resource *nfit_res = get_nfit_res(offset); 96 97 if (nfit_res) 98 return nfit_res->buf + offset - nfit_res->res->start; 99 return devm_memremap(dev, offset, size, flags); 100 } 101 EXPORT_SYMBOL(__wrap_devm_memremap); 102 103 void *__wrap_devm_memremap_pages(struct device *dev, struct resource *res, 104 struct percpu_ref *ref, struct vmem_altmap *altmap) 105 { 106 resource_size_t offset = res->start; 107 struct nfit_test_resource *nfit_res = get_nfit_res(offset); 108 109 if (nfit_res) 110 return nfit_res->buf + offset - nfit_res->res->start; 111 return devm_memremap_pages(dev, res, ref, altmap); 112 } 113 EXPORT_SYMBOL(__wrap_devm_memremap_pages); 114 115 pfn_t __wrap_phys_to_pfn_t(phys_addr_t addr, unsigned long flags) 116 { 117 struct nfit_test_resource *nfit_res = get_nfit_res(addr); 118 119 if (nfit_res) 120 flags &= ~PFN_MAP; 121 return phys_to_pfn_t(addr, flags); 122 } 123 EXPORT_SYMBOL(__wrap_phys_to_pfn_t); 124 125 void *__wrap_memremap(resource_size_t offset, size_t size, 126 unsigned long flags) 127 { 128 struct nfit_test_resource *nfit_res = get_nfit_res(offset); 129 130 if (nfit_res) 131 return nfit_res->buf + offset - nfit_res->res->start; 132 return memremap(offset, size, flags); 133 } 134 EXPORT_SYMBOL(__wrap_memremap); 135 136 void __wrap_devm_memunmap(struct device *dev, void *addr) 137 { 138 struct nfit_test_resource *nfit_res = get_nfit_res((long) addr); 139 140 if (nfit_res) 141 return; 142 return devm_memunmap(dev, addr); 143 } 144 EXPORT_SYMBOL(__wrap_devm_memunmap); 145 146 void __iomem *__wrap_ioremap_nocache(resource_size_t offset, unsigned long size) 147 { 148 return __nfit_test_ioremap(offset, size, ioremap_nocache); 149 } 150 EXPORT_SYMBOL(__wrap_ioremap_nocache); 151 152 void __iomem *__wrap_ioremap_wc(resource_size_t offset, unsigned long size) 153 { 154 return __nfit_test_ioremap(offset, size, ioremap_wc); 155 } 156 EXPORT_SYMBOL(__wrap_ioremap_wc); 157 158 void __wrap_iounmap(volatile void __iomem *addr) 159 { 160 struct nfit_test_resource *nfit_res = get_nfit_res((long) addr); 161 if (nfit_res) 162 return; 163 return iounmap(addr); 164 } 165 EXPORT_SYMBOL(__wrap_iounmap); 166 167 void __wrap_memunmap(void *addr) 168 { 169 struct nfit_test_resource *nfit_res = get_nfit_res((long) addr); 170 171 if (nfit_res) 172 return; 173 return memunmap(addr); 174 } 175 EXPORT_SYMBOL(__wrap_memunmap); 176 177 static struct resource *nfit_test_request_region(struct device *dev, 178 struct resource *parent, resource_size_t start, 179 resource_size_t n, const char *name, int flags) 180 { 181 struct nfit_test_resource *nfit_res; 182 183 if (parent == &iomem_resource) { 184 nfit_res = get_nfit_res(start); 185 if (nfit_res) { 186 struct resource *res = nfit_res->res + 1; 187 188 if (start + n > nfit_res->res->start 189 + resource_size(nfit_res->res)) { 190 pr_debug("%s: start: %llx n: %llx overflow: %pr\n", 191 __func__, start, n, 192 nfit_res->res); 193 return NULL; 194 } 195 196 res->start = start; 197 res->end = start + n - 1; 198 res->name = name; 199 res->flags = resource_type(parent); 200 res->flags |= IORESOURCE_BUSY | flags; 201 pr_debug("%s: %pr\n", __func__, res); 202 return res; 203 } 204 } 205 if (dev) 206 return __devm_request_region(dev, parent, start, n, name); 207 return __request_region(parent, start, n, name, flags); 208 } 209 210 struct resource *__wrap___request_region(struct resource *parent, 211 resource_size_t start, resource_size_t n, const char *name, 212 int flags) 213 { 214 return nfit_test_request_region(NULL, parent, start, n, name, flags); 215 } 216 EXPORT_SYMBOL(__wrap___request_region); 217 218 int __wrap_insert_resource(struct resource *parent, struct resource *res) 219 { 220 if (get_nfit_res(res->start)) 221 return 0; 222 return insert_resource(parent, res); 223 } 224 EXPORT_SYMBOL(__wrap_insert_resource); 225 226 int __wrap_remove_resource(struct resource *res) 227 { 228 if (get_nfit_res(res->start)) 229 return 0; 230 return remove_resource(res); 231 } 232 EXPORT_SYMBOL(__wrap_remove_resource); 233 234 struct resource *__wrap___devm_request_region(struct device *dev, 235 struct resource *parent, resource_size_t start, 236 resource_size_t n, const char *name) 237 { 238 if (!dev) 239 return NULL; 240 return nfit_test_request_region(dev, parent, start, n, name, 0); 241 } 242 EXPORT_SYMBOL(__wrap___devm_request_region); 243 244 static bool nfit_test_release_region(struct resource *parent, 245 resource_size_t start, resource_size_t n) 246 { 247 if (parent == &iomem_resource) { 248 struct nfit_test_resource *nfit_res = get_nfit_res(start); 249 if (nfit_res) { 250 struct resource *res = nfit_res->res + 1; 251 252 if (start != res->start || resource_size(res) != n) 253 pr_info("%s: start: %llx n: %llx mismatch: %pr\n", 254 __func__, start, n, res); 255 else 256 memset(res, 0, sizeof(*res)); 257 return true; 258 } 259 } 260 return false; 261 } 262 263 void __wrap___release_region(struct resource *parent, resource_size_t start, 264 resource_size_t n) 265 { 266 if (!nfit_test_release_region(parent, start, n)) 267 __release_region(parent, start, n); 268 } 269 EXPORT_SYMBOL(__wrap___release_region); 270 271 void __wrap___devm_release_region(struct device *dev, struct resource *parent, 272 resource_size_t start, resource_size_t n) 273 { 274 if (!nfit_test_release_region(parent, start, n)) 275 __devm_release_region(dev, parent, start, n); 276 } 277 EXPORT_SYMBOL(__wrap___devm_release_region); 278 279 MODULE_LICENSE("GPL v2"); 280