tools/testing/nvdimm/test/iomap.c

   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 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");