1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. 4 */ 5 #include <linux/memremap.h> 6 #include <linux/rculist.h> 7 #include <linux/export.h> 8 #include <linux/ioport.h> 9 #include <linux/module.h> 10 #include <linux/types.h> 11 #include <linux/pfn_t.h> 12 #include <linux/acpi.h> 13 #include <linux/io.h> 14 #include <linux/mm.h> 15 #include "nfit_test.h" 16 17 static LIST_HEAD(iomap_head); 18 19 static struct iomap_ops { 20 nfit_test_lookup_fn nfit_test_lookup; 21 nfit_test_evaluate_dsm_fn evaluate_dsm; 22 struct list_head list; 23 } iomap_ops = { 24 .list = LIST_HEAD_INIT(iomap_ops.list), 25 }; 26 27 void nfit_test_setup(nfit_test_lookup_fn lookup, 28 nfit_test_evaluate_dsm_fn evaluate) 29 { 30 iomap_ops.nfit_test_lookup = lookup; 31 iomap_ops.evaluate_dsm = evaluate; 32 list_add_rcu(&iomap_ops.list, &iomap_head); 33 } 34 EXPORT_SYMBOL(nfit_test_setup); 35 36 void nfit_test_teardown(void) 37 { 38 list_del_rcu(&iomap_ops.list); 39 synchronize_rcu(); 40 } 41 EXPORT_SYMBOL(nfit_test_teardown); 42 43 static struct nfit_test_resource *__get_nfit_res(resource_size_t resource) 44 { 45 struct iomap_ops *ops; 46 47 ops = list_first_or_null_rcu(&iomap_head, typeof(*ops), list); 48 if (ops) 49 return ops->nfit_test_lookup(resource); 50 return NULL; 51 } 52 53 struct nfit_test_resource *get_nfit_res(resource_size_t resource) 54 { 55 struct nfit_test_resource *res; 56 57 rcu_read_lock(); 58 res = __get_nfit_res(resource); 59 rcu_read_unlock(); 60 61 return res; 62 } 63 EXPORT_SYMBOL(get_nfit_res); 64 65 static void __iomem *__nfit_test_ioremap(resource_size_t offset, unsigned long size, 66 void __iomem *(*fallback_fn)(resource_size_t, unsigned long)) 67 { 68 struct nfit_test_resource *nfit_res = get_nfit_res(offset); 69 70 if (nfit_res) 71 return (void __iomem *) nfit_res->buf + offset 72 - nfit_res->res.start; 73 return fallback_fn(offset, size); 74 } 75 76 void __iomem *__wrap_devm_ioremap(struct device *dev, 77 resource_size_t offset, unsigned long size) 78 { 79 struct nfit_test_resource *nfit_res = get_nfit_res(offset); 80 81 if (nfit_res) 82 return (void __iomem *) nfit_res->buf + offset 83 - nfit_res->res.start; 84 return devm_ioremap(dev, offset, size); 85 } 86 EXPORT_SYMBOL(__wrap_devm_ioremap); 87 88 void *__wrap_devm_memremap(struct device *dev, resource_size_t offset, 89 size_t size, unsigned long flags) 90 { 91 struct nfit_test_resource *nfit_res = get_nfit_res(offset); 92 93 if (nfit_res) 94 return nfit_res->buf + offset - nfit_res->res.start; 95 return devm_memremap(dev, offset, size, flags); 96 } 97 EXPORT_SYMBOL(__wrap_devm_memremap); 98 99 static void nfit_test_kill(void *_pgmap) 100 { 101 struct dev_pagemap *pgmap = _pgmap; 102 103 WARN_ON(!pgmap || !pgmap->ref); 104 105 if (pgmap->ops && pgmap->ops->kill) 106 pgmap->ops->kill(pgmap); 107 else 108 percpu_ref_kill(pgmap->ref); 109 110 if (pgmap->ops && pgmap->ops->cleanup) { 111 pgmap->ops->cleanup(pgmap); 112 } else { 113 wait_for_completion(&pgmap->done); 114 percpu_ref_exit(pgmap->ref); 115 } 116 } 117 118 static void dev_pagemap_percpu_release(struct percpu_ref *ref) 119 { 120 struct dev_pagemap *pgmap = 121 container_of(ref, struct dev_pagemap, internal_ref); 122 123 complete(&pgmap->done); 124 } 125 126 void *__wrap_devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) 127 { 128 int error; 129 resource_size_t offset = pgmap->range.start; 130 struct nfit_test_resource *nfit_res = get_nfit_res(offset); 131 132 if (!nfit_res) 133 return devm_memremap_pages(dev, pgmap); 134 135 if (!pgmap->ref) { 136 if (pgmap->ops && (pgmap->ops->kill || pgmap->ops->cleanup)) 137 return ERR_PTR(-EINVAL); 138 139 init_completion(&pgmap->done); 140 error = percpu_ref_init(&pgmap->internal_ref, 141 dev_pagemap_percpu_release, 0, GFP_KERNEL); 142 if (error) 143 return ERR_PTR(error); 144 pgmap->ref = &pgmap->internal_ref; 145 } else { 146 if (!pgmap->ops || !pgmap->ops->kill || !pgmap->ops->cleanup) { 147 WARN(1, "Missing reference count teardown definition\n"); 148 return ERR_PTR(-EINVAL); 149 } 150 } 151 152 error = devm_add_action_or_reset(dev, nfit_test_kill, pgmap); 153 if (error) 154 return ERR_PTR(error); 155 return nfit_res->buf + offset - nfit_res->res.start; 156 } 157 EXPORT_SYMBOL_GPL(__wrap_devm_memremap_pages); 158 159 pfn_t __wrap_phys_to_pfn_t(phys_addr_t addr, unsigned long flags) 160 { 161 struct nfit_test_resource *nfit_res = get_nfit_res(addr); 162 163 if (nfit_res) 164 flags &= ~PFN_MAP; 165 return phys_to_pfn_t(addr, flags); 166 } 167 EXPORT_SYMBOL(__wrap_phys_to_pfn_t); 168 169 void *__wrap_memremap(resource_size_t offset, size_t size, 170 unsigned long flags) 171 { 172 struct nfit_test_resource *nfit_res = get_nfit_res(offset); 173 174 if (nfit_res) 175 return nfit_res->buf + offset - nfit_res->res.start; 176 return memremap(offset, size, flags); 177 } 178 EXPORT_SYMBOL(__wrap_memremap); 179 180 void __wrap_devm_memunmap(struct device *dev, void *addr) 181 { 182 struct nfit_test_resource *nfit_res = get_nfit_res((long) addr); 183 184 if (nfit_res) 185 return; 186 return devm_memunmap(dev, addr); 187 } 188 EXPORT_SYMBOL(__wrap_devm_memunmap); 189 190 void __iomem *__wrap_ioremap(resource_size_t offset, unsigned long size) 191 { 192 return __nfit_test_ioremap(offset, size, ioremap); 193 } 194 EXPORT_SYMBOL(__wrap_ioremap); 195 196 void __iomem *__wrap_ioremap_wc(resource_size_t offset, unsigned long size) 197 { 198 return __nfit_test_ioremap(offset, size, ioremap_wc); 199 } 200 EXPORT_SYMBOL(__wrap_ioremap_wc); 201 202 void __wrap_iounmap(volatile void __iomem *addr) 203 { 204 struct nfit_test_resource *nfit_res = get_nfit_res((long) addr); 205 if (nfit_res) 206 return; 207 return iounmap(addr); 208 } 209 EXPORT_SYMBOL(__wrap_iounmap); 210 211 void __wrap_memunmap(void *addr) 212 { 213 struct nfit_test_resource *nfit_res = get_nfit_res((long) addr); 214 215 if (nfit_res) 216 return; 217 return memunmap(addr); 218 } 219 EXPORT_SYMBOL(__wrap_memunmap); 220 221 static bool nfit_test_release_region(struct device *dev, 222 struct resource *parent, resource_size_t start, 223 resource_size_t n); 224 225 static void nfit_devres_release(struct device *dev, void *data) 226 { 227 struct resource *res = *((struct resource **) data); 228 229 WARN_ON(!nfit_test_release_region(NULL, &iomem_resource, res->start, 230 resource_size(res))); 231 } 232 233 static int match(struct device *dev, void *__res, void *match_data) 234 { 235 struct resource *res = *((struct resource **) __res); 236 resource_size_t start = *((resource_size_t *) match_data); 237 238 return res->start == start; 239 } 240 241 static bool nfit_test_release_region(struct device *dev, 242 struct resource *parent, resource_size_t start, 243 resource_size_t n) 244 { 245 if (parent == &iomem_resource) { 246 struct nfit_test_resource *nfit_res = get_nfit_res(start); 247 248 if (nfit_res) { 249 struct nfit_test_request *req; 250 struct resource *res = NULL; 251 252 if (dev) { 253 devres_release(dev, nfit_devres_release, match, 254 &start); 255 return true; 256 } 257 258 spin_lock(&nfit_res->lock); 259 list_for_each_entry(req, &nfit_res->requests, list) 260 if (req->res.start == start) { 261 res = &req->res; 262 list_del(&req->list); 263 break; 264 } 265 spin_unlock(&nfit_res->lock); 266 267 WARN(!res || resource_size(res) != n, 268 "%s: start: %llx n: %llx mismatch: %pr\n", 269 __func__, start, n, res); 270 if (res) 271 kfree(req); 272 return true; 273 } 274 } 275 return false; 276 } 277 278 static struct resource *nfit_test_request_region(struct device *dev, 279 struct resource *parent, resource_size_t start, 280 resource_size_t n, const char *name, int flags) 281 { 282 struct nfit_test_resource *nfit_res; 283 284 if (parent == &iomem_resource) { 285 nfit_res = get_nfit_res(start); 286 if (nfit_res) { 287 struct nfit_test_request *req; 288 struct resource *res = NULL; 289 290 if (start + n > nfit_res->res.start 291 + resource_size(&nfit_res->res)) { 292 pr_debug("%s: start: %llx n: %llx overflow: %pr\n", 293 __func__, start, n, 294 &nfit_res->res); 295 return NULL; 296 } 297 298 spin_lock(&nfit_res->lock); 299 list_for_each_entry(req, &nfit_res->requests, list) 300 if (start == req->res.start) { 301 res = &req->res; 302 break; 303 } 304 spin_unlock(&nfit_res->lock); 305 306 if (res) { 307 WARN(1, "%pr already busy\n", res); 308 return NULL; 309 } 310 311 req = kzalloc(sizeof(*req), GFP_KERNEL); 312 if (!req) 313 return NULL; 314 INIT_LIST_HEAD(&req->list); 315 res = &req->res; 316 317 res->start = start; 318 res->end = start + n - 1; 319 res->name = name; 320 res->flags = resource_type(parent); 321 res->flags |= IORESOURCE_BUSY | flags; 322 spin_lock(&nfit_res->lock); 323 list_add(&req->list, &nfit_res->requests); 324 spin_unlock(&nfit_res->lock); 325 326 if (dev) { 327 struct resource **d; 328 329 d = devres_alloc(nfit_devres_release, 330 sizeof(struct resource *), 331 GFP_KERNEL); 332 if (!d) 333 return NULL; 334 *d = res; 335 devres_add(dev, d); 336 } 337 338 pr_debug("%s: %pr\n", __func__, res); 339 return res; 340 } 341 } 342 if (dev) 343 return __devm_request_region(dev, parent, start, n, name); 344 return __request_region(parent, start, n, name, flags); 345 } 346 347 struct resource *__wrap___request_region(struct resource *parent, 348 resource_size_t start, resource_size_t n, const char *name, 349 int flags) 350 { 351 return nfit_test_request_region(NULL, parent, start, n, name, flags); 352 } 353 EXPORT_SYMBOL(__wrap___request_region); 354 355 int __wrap_insert_resource(struct resource *parent, struct resource *res) 356 { 357 if (get_nfit_res(res->start)) 358 return 0; 359 return insert_resource(parent, res); 360 } 361 EXPORT_SYMBOL(__wrap_insert_resource); 362 363 int __wrap_remove_resource(struct resource *res) 364 { 365 if (get_nfit_res(res->start)) 366 return 0; 367 return remove_resource(res); 368 } 369 EXPORT_SYMBOL(__wrap_remove_resource); 370 371 struct resource *__wrap___devm_request_region(struct device *dev, 372 struct resource *parent, resource_size_t start, 373 resource_size_t n, const char *name) 374 { 375 if (!dev) 376 return NULL; 377 return nfit_test_request_region(dev, parent, start, n, name, 0); 378 } 379 EXPORT_SYMBOL(__wrap___devm_request_region); 380 381 void __wrap___release_region(struct resource *parent, resource_size_t start, 382 resource_size_t n) 383 { 384 if (!nfit_test_release_region(NULL, parent, start, n)) 385 __release_region(parent, start, n); 386 } 387 EXPORT_SYMBOL(__wrap___release_region); 388 389 void __wrap___devm_release_region(struct device *dev, struct resource *parent, 390 resource_size_t start, resource_size_t n) 391 { 392 if (!nfit_test_release_region(dev, parent, start, n)) 393 __devm_release_region(dev, parent, start, n); 394 } 395 EXPORT_SYMBOL(__wrap___devm_release_region); 396 397 acpi_status __wrap_acpi_evaluate_object(acpi_handle handle, acpi_string path, 398 struct acpi_object_list *p, struct acpi_buffer *buf) 399 { 400 struct nfit_test_resource *nfit_res = get_nfit_res((long) handle); 401 union acpi_object **obj; 402 403 if (!nfit_res || strcmp(path, "_FIT") || !buf) 404 return acpi_evaluate_object(handle, path, p, buf); 405 406 obj = nfit_res->buf; 407 buf->length = sizeof(union acpi_object); 408 buf->pointer = *obj; 409 return AE_OK; 410 } 411 EXPORT_SYMBOL(__wrap_acpi_evaluate_object); 412 413 union acpi_object * __wrap_acpi_evaluate_dsm(acpi_handle handle, const guid_t *guid, 414 u64 rev, u64 func, union acpi_object *argv4) 415 { 416 union acpi_object *obj = ERR_PTR(-ENXIO); 417 struct iomap_ops *ops; 418 419 rcu_read_lock(); 420 ops = list_first_or_null_rcu(&iomap_head, typeof(*ops), list); 421 if (ops) 422 obj = ops->evaluate_dsm(handle, guid, rev, func, argv4); 423 rcu_read_unlock(); 424 425 if (IS_ERR(obj)) 426 return acpi_evaluate_dsm(handle, guid, rev, func, argv4); 427 return obj; 428 } 429 EXPORT_SYMBOL(__wrap_acpi_evaluate_dsm); 430 431 MODULE_LICENSE("GPL v2"); 432