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/rculist.h> 14 #include <linux/export.h> 15 #include <linux/ioport.h> 16 #include <linux/module.h> 17 #include <linux/types.h> 18 #include <linux/io.h> 19 #include <linux/mm.h> 20 #include "nfit_test.h" 21 22 static LIST_HEAD(iomap_head); 23 24 static struct iomap_ops { 25 nfit_test_lookup_fn nfit_test_lookup; 26 struct list_head list; 27 } iomap_ops = { 28 .list = LIST_HEAD_INIT(iomap_ops.list), 29 }; 30 31 void nfit_test_setup(nfit_test_lookup_fn lookup) 32 { 33 iomap_ops.nfit_test_lookup = lookup; 34 list_add_rcu(&iomap_ops.list, &iomap_head); 35 } 36 EXPORT_SYMBOL(nfit_test_setup); 37 38 void nfit_test_teardown(void) 39 { 40 list_del_rcu(&iomap_ops.list); 41 synchronize_rcu(); 42 } 43 EXPORT_SYMBOL(nfit_test_teardown); 44 45 static struct nfit_test_resource *__get_nfit_res(resource_size_t resource) 46 { 47 struct iomap_ops *ops; 48 49 ops = list_first_or_null_rcu(&iomap_head, typeof(*ops), list); 50 if (ops) 51 return ops->nfit_test_lookup(resource); 52 return NULL; 53 } 54 55 struct nfit_test_resource *get_nfit_res(resource_size_t resource) 56 { 57 struct nfit_test_resource *res; 58 59 rcu_read_lock(); 60 res = __get_nfit_res(resource); 61 rcu_read_unlock(); 62 63 return res; 64 } 65 EXPORT_SYMBOL(get_nfit_res); 66 67 void __iomem *__nfit_test_ioremap(resource_size_t offset, unsigned long size, 68 void __iomem *(*fallback_fn)(resource_size_t, unsigned long)) 69 { 70 struct nfit_test_resource *nfit_res = get_nfit_res(offset); 71 72 if (nfit_res) 73 return (void __iomem *) nfit_res->buf + offset 74 - nfit_res->res->start; 75 return fallback_fn(offset, size); 76 } 77 78 void __iomem *__wrap_devm_ioremap_nocache(struct device *dev, 79 resource_size_t offset, unsigned long size) 80 { 81 struct nfit_test_resource *nfit_res = get_nfit_res(offset); 82 83 if (nfit_res) 84 return (void __iomem *) nfit_res->buf + offset 85 - nfit_res->res->start; 86 return devm_ioremap_nocache(dev, offset, size); 87 } 88 EXPORT_SYMBOL(__wrap_devm_ioremap_nocache); 89 90 void *__wrap_devm_memremap(struct device *dev, resource_size_t offset, 91 size_t size, unsigned long flags) 92 { 93 struct nfit_test_resource *nfit_res = get_nfit_res(offset); 94 95 if (nfit_res) 96 return nfit_res->buf + offset - nfit_res->res->start; 97 return devm_memremap(dev, offset, size, flags); 98 } 99 EXPORT_SYMBOL(__wrap_devm_memremap); 100 101 #ifdef __HAVE_ARCH_PTE_DEVMAP 102 #include <linux/memremap.h> 103 #include <linux/pfn_t.h> 104 105 void *__wrap_devm_memremap_pages(struct device *dev, struct resource *res, 106 struct percpu_ref *ref, struct vmem_altmap *altmap) 107 { 108 resource_size_t offset = res->start; 109 struct nfit_test_resource *nfit_res = get_nfit_res(offset); 110 111 if (nfit_res) 112 return nfit_res->buf + offset - nfit_res->res->start; 113 return devm_memremap_pages(dev, res, ref, altmap); 114 } 115 EXPORT_SYMBOL(__wrap_devm_memremap_pages); 116 117 pfn_t __wrap_phys_to_pfn_t(phys_addr_t addr, unsigned long flags) 118 { 119 struct nfit_test_resource *nfit_res = get_nfit_res(addr); 120 121 if (nfit_res) 122 flags &= ~PFN_MAP; 123 return phys_to_pfn_t(addr, flags); 124 } 125 EXPORT_SYMBOL(__wrap_phys_to_pfn_t); 126 #else 127 /* to be removed post 4.5-rc1 */ 128 void *__wrap_devm_memremap_pages(struct device *dev, struct resource *res) 129 { 130 resource_size_t offset = res->start; 131 struct nfit_test_resource *nfit_res = get_nfit_res(offset); 132 133 if (nfit_res) 134 return nfit_res->buf + offset - nfit_res->res->start; 135 return devm_memremap_pages(dev, res); 136 } 137 EXPORT_SYMBOL(__wrap_devm_memremap_pages); 138 #endif 139 140 void *__wrap_memremap(resource_size_t offset, size_t size, 141 unsigned long flags) 142 { 143 struct nfit_test_resource *nfit_res = get_nfit_res(offset); 144 145 if (nfit_res) 146 return nfit_res->buf + offset - nfit_res->res->start; 147 return memremap(offset, size, flags); 148 } 149 EXPORT_SYMBOL(__wrap_memremap); 150 151 void __wrap_devm_memunmap(struct device *dev, void *addr) 152 { 153 struct nfit_test_resource *nfit_res = get_nfit_res((long) addr); 154 155 if (nfit_res) 156 return; 157 return devm_memunmap(dev, addr); 158 } 159 EXPORT_SYMBOL(__wrap_devm_memunmap); 160 161 void __iomem *__wrap_ioremap_nocache(resource_size_t offset, unsigned long size) 162 { 163 return __nfit_test_ioremap(offset, size, ioremap_nocache); 164 } 165 EXPORT_SYMBOL(__wrap_ioremap_nocache); 166 167 void __iomem *__wrap_ioremap_wc(resource_size_t offset, unsigned long size) 168 { 169 return __nfit_test_ioremap(offset, size, ioremap_wc); 170 } 171 EXPORT_SYMBOL(__wrap_ioremap_wc); 172 173 void __wrap_iounmap(volatile void __iomem *addr) 174 { 175 struct nfit_test_resource *nfit_res = get_nfit_res((long) addr); 176 if (nfit_res) 177 return; 178 return iounmap(addr); 179 } 180 EXPORT_SYMBOL(__wrap_iounmap); 181 182 void __wrap_memunmap(void *addr) 183 { 184 struct nfit_test_resource *nfit_res = get_nfit_res((long) addr); 185 186 if (nfit_res) 187 return; 188 return memunmap(addr); 189 } 190 EXPORT_SYMBOL(__wrap_memunmap); 191 192 static struct resource *nfit_test_request_region(struct device *dev, 193 struct resource *parent, resource_size_t start, 194 resource_size_t n, const char *name, int flags) 195 { 196 struct nfit_test_resource *nfit_res; 197 198 if (parent == &iomem_resource) { 199 nfit_res = get_nfit_res(start); 200 if (nfit_res) { 201 struct resource *res = nfit_res->res + 1; 202 203 if (start + n > nfit_res->res->start 204 + resource_size(nfit_res->res)) { 205 pr_debug("%s: start: %llx n: %llx overflow: %pr\n", 206 __func__, start, n, 207 nfit_res->res); 208 return NULL; 209 } 210 211 res->start = start; 212 res->end = start + n - 1; 213 res->name = name; 214 res->flags = resource_type(parent); 215 res->flags |= IORESOURCE_BUSY | flags; 216 pr_debug("%s: %pr\n", __func__, res); 217 return res; 218 } 219 } 220 if (dev) 221 return __devm_request_region(dev, parent, start, n, name); 222 return __request_region(parent, start, n, name, flags); 223 } 224 225 struct resource *__wrap___request_region(struct resource *parent, 226 resource_size_t start, resource_size_t n, const char *name, 227 int flags) 228 { 229 return nfit_test_request_region(NULL, parent, start, n, name, flags); 230 } 231 EXPORT_SYMBOL(__wrap___request_region); 232 233 int __wrap_insert_resource(struct resource *parent, struct resource *res) 234 { 235 if (get_nfit_res(res->start)) 236 return 0; 237 return insert_resource(parent, res); 238 } 239 EXPORT_SYMBOL(__wrap_insert_resource); 240 241 int __wrap_remove_resource(struct resource *res) 242 { 243 if (get_nfit_res(res->start)) 244 return 0; 245 return remove_resource(res); 246 } 247 EXPORT_SYMBOL(__wrap_remove_resource); 248 249 struct resource *__wrap___devm_request_region(struct device *dev, 250 struct resource *parent, resource_size_t start, 251 resource_size_t n, const char *name) 252 { 253 if (!dev) 254 return NULL; 255 return nfit_test_request_region(dev, parent, start, n, name, 0); 256 } 257 EXPORT_SYMBOL(__wrap___devm_request_region); 258 259 static bool nfit_test_release_region(struct resource *parent, 260 resource_size_t start, resource_size_t n) 261 { 262 if (parent == &iomem_resource) { 263 struct nfit_test_resource *nfit_res = get_nfit_res(start); 264 if (nfit_res) { 265 struct resource *res = nfit_res->res + 1; 266 267 if (start != res->start || resource_size(res) != n) 268 pr_info("%s: start: %llx n: %llx mismatch: %pr\n", 269 __func__, start, n, res); 270 else 271 memset(res, 0, sizeof(*res)); 272 return true; 273 } 274 } 275 return false; 276 } 277 278 void __wrap___release_region(struct resource *parent, resource_size_t start, 279 resource_size_t n) 280 { 281 if (!nfit_test_release_region(parent, start, n)) 282 __release_region(parent, start, n); 283 } 284 EXPORT_SYMBOL(__wrap___release_region); 285 286 void __wrap___devm_release_region(struct device *dev, struct resource *parent, 287 resource_size_t start, resource_size_t n) 288 { 289 if (!nfit_test_release_region(parent, start, n)) 290 __devm_release_region(dev, parent, start, n); 291 } 292 EXPORT_SYMBOL(__wrap___devm_release_region); 293 294 MODULE_LICENSE("GPL v2"); 295