tools/testing/nvdimm/test/iomap.c

   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/acpi.h>
  21 #include <linux/io.h>
  22 #include <linux/mm.h>
  23 #include "nfit_test.h"
  24
  25 static LIST_HEAD(iomap_head);
  26
  27 static struct iomap_ops {
  28         nfit_test_lookup_fn nfit_test_lookup;
  29         nfit_test_evaluate_dsm_fn evaluate_dsm;
  30         struct list_head list;
  31 } iomap_ops = {
  32         .list = LIST_HEAD_INIT(iomap_ops.list),
  33 };
  34
  35 void nfit_test_setup(nfit_test_lookup_fn lookup,
  36                 nfit_test_evaluate_dsm_fn evaluate)
  37 {
  38         iomap_ops.nfit_test_lookup = lookup;
  39         iomap_ops.evaluate_dsm = evaluate;
  40         list_add_rcu(&iomap_ops.list, &iomap_head);
  41 }
  42 EXPORT_SYMBOL(nfit_test_setup);
  43
  44 void nfit_test_teardown(void)
  45 {
  46         list_del_rcu(&iomap_ops.list);
  47         synchronize_rcu();
  48 }
  49 EXPORT_SYMBOL(nfit_test_teardown);
  50
  51 static struct nfit_test_resource *__get_nfit_res(resource_size_t resource)
  52 {
  53         struct iomap_ops *ops;
  54
  55         ops = list_first_or_null_rcu(&iomap_head, typeof(*ops), list);
  56         if (ops)
  57                 return ops->nfit_test_lookup(resource);
  58         return NULL;
  59 }
  60
  61 struct nfit_test_resource *get_nfit_res(resource_size_t resource)
  62 {
  63         struct nfit_test_resource *res;
  64
  65         rcu_read_lock();
  66         res = __get_nfit_res(resource);
  67         rcu_read_unlock();
  68
  69         return res;
  70 }
  71 EXPORT_SYMBOL(get_nfit_res);
  72
  73 void __iomem *__nfit_test_ioremap(resource_size_t offset, unsigned long size,
  74                 void __iomem *(*fallback_fn)(resource_size_t, unsigned long))
  75 {
  76         struct nfit_test_resource *nfit_res = get_nfit_res(offset);
  77
  78         if (nfit_res)
  79                 return (void __iomem *) nfit_res->buf + offset
  80                         - nfit_res->res.start;
  81         return fallback_fn(offset, size);
  82 }
  83
  84 void __iomem *__wrap_devm_ioremap_nocache(struct device *dev,
  85                 resource_size_t offset, unsigned long size)
  86 {
  87         struct nfit_test_resource *nfit_res = get_nfit_res(offset);
  88
  89         if (nfit_res)
  90                 return (void __iomem *) nfit_res->buf + offset
  91                         - nfit_res->res.start;
  92         return devm_ioremap_nocache(dev, offset, size);
  93 }
  94 EXPORT_SYMBOL(__wrap_devm_ioremap_nocache);
  95
  96 void *__wrap_devm_memremap(struct device *dev, resource_size_t offset,
  97                 size_t size, unsigned long flags)
  98 {
  99         struct nfit_test_resource *nfit_res = get_nfit_res(offset);
 100
 101         if (nfit_res)
 102                 return nfit_res->buf + offset - nfit_res->res.start;
 103         return devm_memremap(dev, offset, size, flags);
 104 }
 105 EXPORT_SYMBOL(__wrap_devm_memremap);
 106
 107 void *__wrap_devm_memremap_pages(struct device *dev, struct resource *res,
 108                 struct percpu_ref *ref, struct vmem_altmap *altmap)
 109 {
 110         resource_size_t offset = res->start;
 111         struct nfit_test_resource *nfit_res = get_nfit_res(offset);
 112
 113         if (nfit_res)
 114                 return nfit_res->buf + offset - nfit_res->res.start;
 115         return devm_memremap_pages(dev, res, ref, altmap);
 116 }
 117 EXPORT_SYMBOL(__wrap_devm_memremap_pages);
 118
 119 pfn_t __wrap_phys_to_pfn_t(phys_addr_t addr, unsigned long flags)
 120 {
 121         struct nfit_test_resource *nfit_res = get_nfit_res(addr);
 122
 123         if (nfit_res)
 124                 flags &= ~PFN_MAP;
 125         return phys_to_pfn_t(addr, flags);
 126 }
 127 EXPORT_SYMBOL(__wrap_phys_to_pfn_t);
 128
 129 void *__wrap_memremap(resource_size_t offset, size_t size,
 130                 unsigned long flags)
 131 {
 132         struct nfit_test_resource *nfit_res = get_nfit_res(offset);
 133
 134         if (nfit_res)
 135                 return nfit_res->buf + offset - nfit_res->res.start;
 136         return memremap(offset, size, flags);
 137 }
 138 EXPORT_SYMBOL(__wrap_memremap);
 139
 140 void __wrap_devm_memunmap(struct device *dev, void *addr)
 141 {
 142         struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
 143
 144         if (nfit_res)
 145                 return;
 146         return devm_memunmap(dev, addr);
 147 }
 148 EXPORT_SYMBOL(__wrap_devm_memunmap);
 149
 150 void __iomem *__wrap_ioremap_nocache(resource_size_t offset, unsigned long size)
 151 {
 152         return __nfit_test_ioremap(offset, size, ioremap_nocache);
 153 }
 154 EXPORT_SYMBOL(__wrap_ioremap_nocache);
 155
 156 void __iomem *__wrap_ioremap_wc(resource_size_t offset, unsigned long size)
 157 {
 158         return __nfit_test_ioremap(offset, size, ioremap_wc);
 159 }
 160 EXPORT_SYMBOL(__wrap_ioremap_wc);
 161
 162 void __wrap_iounmap(volatile void __iomem *addr)
 163 {
 164         struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
 165         if (nfit_res)
 166                 return;
 167         return iounmap(addr);
 168 }
 169 EXPORT_SYMBOL(__wrap_iounmap);
 170
 171 void __wrap_memunmap(void *addr)
 172 {
 173         struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
 174
 175         if (nfit_res)
 176                 return;
 177         return memunmap(addr);
 178 }
 179 EXPORT_SYMBOL(__wrap_memunmap);
 180
 181 static bool nfit_test_release_region(struct device *dev,
 182                 struct resource *parent, resource_size_t start,
 183                 resource_size_t n);
 184
 185 static void nfit_devres_release(struct device *dev, void *data)
 186 {
 187         struct resource *res = *((struct resource **) data);
 188
 189         WARN_ON(!nfit_test_release_region(NULL, &iomem_resource, res->start,
 190                         resource_size(res)));
 191 }
 192
 193 static int match(struct device *dev, void *__res, void *match_data)
 194 {
 195         struct resource *res = *((struct resource **) __res);
 196         resource_size_t start = *((resource_size_t *) match_data);
 197
 198         return res->start == start;
 199 }
 200
 201 static bool nfit_test_release_region(struct device *dev,
 202                 struct resource *parent, resource_size_t start,
 203                 resource_size_t n)
 204 {
 205         if (parent == &iomem_resource) {
 206                 struct nfit_test_resource *nfit_res = get_nfit_res(start);
 207
 208                 if (nfit_res) {
 209                         struct nfit_test_request *req;
 210                         struct resource *res = NULL;
 211
 212                         if (dev) {
 213                                 devres_release(dev, nfit_devres_release, match,
 214                                                 &start);
 215                                 return true;
 216                         }
 217
 218                         spin_lock(&nfit_res->lock);
 219                         list_for_each_entry(req, &nfit_res->requests, list)
 220                                 if (req->res.start == start) {
 221                                         res = &req->res;
 222                                         list_del(&req->list);
 223                                         break;
 224                                 }
 225                         spin_unlock(&nfit_res->lock);
 226
 227                         WARN(!res || resource_size(res) != n,
 228                                         "%s: start: %llx n: %llx mismatch: %pr\n",
 229                                                 __func__, start, n, res);
 230                         if (res)
 231                                 kfree(req);
 232                         return true;
 233                 }
 234         }
 235         return false;
 236 }
 237
 238 static struct resource *nfit_test_request_region(struct device *dev,
 239                 struct resource *parent, resource_size_t start,
 240                 resource_size_t n, const char *name, int flags)
 241 {
 242         struct nfit_test_resource *nfit_res;
 243
 244         if (parent == &iomem_resource) {
 245                 nfit_res = get_nfit_res(start);
 246                 if (nfit_res) {
 247                         struct nfit_test_request *req;
 248                         struct resource *res = NULL;
 249
 250                         if (start + n > nfit_res->res.start
 251                                         + resource_size(&nfit_res->res)) {
 252                                 pr_debug("%s: start: %llx n: %llx overflow: %pr\n",
 253                                                 __func__, start, n,
 254                                                 &nfit_res->res);
 255                                 return NULL;
 256                         }
 257
 258                         spin_lock(&nfit_res->lock);
 259                         list_for_each_entry(req, &nfit_res->requests, list)
 260                                 if (start == req->res.start) {
 261                                         res = &req->res;
 262                                         break;
 263                                 }
 264                         spin_unlock(&nfit_res->lock);
 265
 266                         if (res) {
 267                                 WARN(1, "%pr already busy\n", res);
 268                                 return NULL;
 269                         }
 270
 271                         req = kzalloc(sizeof(*req), GFP_KERNEL);
 272                         if (!req)
 273                                 return NULL;
 274                         INIT_LIST_HEAD(&req->list);
 275                         res = &req->res;
 276
 277                         res->start = start;
 278                         res->end = start + n - 1;
 279                         res->name = name;
 280                         res->flags = resource_type(parent);
 281                         res->flags |= IORESOURCE_BUSY | flags;
 282                         spin_lock(&nfit_res->lock);
 283                         list_add(&req->list, &nfit_res->requests);
 284                         spin_unlock(&nfit_res->lock);
 285
 286                         if (dev) {
 287                                 struct resource **d;
 288
 289                                 d = devres_alloc(nfit_devres_release,
 290                                                 sizeof(struct resource *),
 291                                                 GFP_KERNEL);
 292                                 if (!d)
 293                                         return NULL;
 294                                 *d = res;
 295                                 devres_add(dev, d);
 296                         }
 297
 298                         pr_debug("%s: %pr\n", __func__, res);
 299                         return res;
 300                 }
 301         }
 302         if (dev)
 303                 return __devm_request_region(dev, parent, start, n, name);
 304         return __request_region(parent, start, n, name, flags);
 305 }
 306
 307 struct resource *__wrap___request_region(struct resource *parent,
 308                 resource_size_t start, resource_size_t n, const char *name,
 309                 int flags)
 310 {
 311         return nfit_test_request_region(NULL, parent, start, n, name, flags);
 312 }
 313 EXPORT_SYMBOL(__wrap___request_region);
 314
 315 int __wrap_insert_resource(struct resource *parent, struct resource *res)
 316 {
 317         if (get_nfit_res(res->start))
 318                 return 0;
 319         return insert_resource(parent, res);
 320 }
 321 EXPORT_SYMBOL(__wrap_insert_resource);
 322
 323 int __wrap_remove_resource(struct resource *res)
 324 {
 325         if (get_nfit_res(res->start))
 326                 return 0;
 327         return remove_resource(res);
 328 }
 329 EXPORT_SYMBOL(__wrap_remove_resource);
 330
 331 struct resource *__wrap___devm_request_region(struct device *dev,
 332                 struct resource *parent, resource_size_t start,
 333                 resource_size_t n, const char *name)
 334 {
 335         if (!dev)
 336                 return NULL;
 337         return nfit_test_request_region(dev, parent, start, n, name, 0);
 338 }
 339 EXPORT_SYMBOL(__wrap___devm_request_region);
 340
 341 void __wrap___release_region(struct resource *parent, resource_size_t start,
 342                 resource_size_t n)
 343 {
 344         if (!nfit_test_release_region(NULL, parent, start, n))
 345                 __release_region(parent, start, n);
 346 }
 347 EXPORT_SYMBOL(__wrap___release_region);
 348
 349 void __wrap___devm_release_region(struct device *dev, struct resource *parent,
 350                 resource_size_t start, resource_size_t n)
 351 {
 352         if (!nfit_test_release_region(dev, parent, start, n))
 353                 __devm_release_region(dev, parent, start, n);
 354 }
 355 EXPORT_SYMBOL(__wrap___devm_release_region);
 356
 357 acpi_status __wrap_acpi_evaluate_object(acpi_handle handle, acpi_string path,
 358                 struct acpi_object_list *p, struct acpi_buffer *buf)
 359 {
 360         struct nfit_test_resource *nfit_res = get_nfit_res((long) handle);
 361         union acpi_object **obj;
 362
 363         if (!nfit_res || strcmp(path, "_FIT") || !buf)
 364                 return acpi_evaluate_object(handle, path, p, buf);
 365
 366         obj = nfit_res->buf;
 367         buf->length = sizeof(union acpi_object);
 368         buf->pointer = *obj;
 369         return AE_OK;
 370 }
 371 EXPORT_SYMBOL(__wrap_acpi_evaluate_object);
 372
 373 union acpi_object * __wrap_acpi_evaluate_dsm(acpi_handle handle, const u8 *uuid,
 374                 u64 rev, u64 func, union acpi_object *argv4)
 375 {
 376         union acpi_object *obj = ERR_PTR(-ENXIO);
 377         struct iomap_ops *ops;
 378
 379         rcu_read_lock();
 380         ops = list_first_or_null_rcu(&iomap_head, typeof(*ops), list);
 381         if (ops)
 382                 obj = ops->evaluate_dsm(handle, uuid, rev, func, argv4);
 383         rcu_read_unlock();
 384
 385         if (IS_ERR(obj))
 386                 return acpi_evaluate_dsm(handle, uuid, rev, func, argv4);
 387         return obj;
 388 }
 389 EXPORT_SYMBOL(__wrap_acpi_evaluate_dsm);
 390
 391 MODULE_LICENSE("GPL v2");