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Linux/tools/testing/nvdimm/test/iomap.c

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  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 dev_pagemap *pgmap)
108 {
109         resource_size_t offset = pgmap->res.start;
110         struct nfit_test_resource *nfit_res = get_nfit_res(offset);
111 
112         if (nfit_res)
113                 return nfit_res->buf + offset - nfit_res->res.start;
114         return devm_memremap_pages(dev, pgmap);
115 }
116 EXPORT_SYMBOL(__wrap_devm_memremap_pages);
117 
118 pfn_t __wrap_phys_to_pfn_t(phys_addr_t addr, unsigned long flags)
119 {
120         struct nfit_test_resource *nfit_res = get_nfit_res(addr);
121 
122         if (nfit_res)
123                 flags &= ~PFN_MAP;
124         return phys_to_pfn_t(addr, flags);
125 }
126 EXPORT_SYMBOL(__wrap_phys_to_pfn_t);
127 
128 void *__wrap_memremap(resource_size_t offset, size_t size,
129                 unsigned long flags)
130 {
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 memremap(offset, size, flags);
136 }
137 EXPORT_SYMBOL(__wrap_memremap);
138 
139 void __wrap_devm_memunmap(struct device *dev, void *addr)
140 {
141         struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
142 
143         if (nfit_res)
144                 return;
145         return devm_memunmap(dev, addr);
146 }
147 EXPORT_SYMBOL(__wrap_devm_memunmap);
148 
149 void __iomem *__wrap_ioremap_nocache(resource_size_t offset, unsigned long size)
150 {
151         return __nfit_test_ioremap(offset, size, ioremap_nocache);
152 }
153 EXPORT_SYMBOL(__wrap_ioremap_nocache);
154 
155 void __iomem *__wrap_ioremap_wc(resource_size_t offset, unsigned long size)
156 {
157         return __nfit_test_ioremap(offset, size, ioremap_wc);
158 }
159 EXPORT_SYMBOL(__wrap_ioremap_wc);
160 
161 void __wrap_iounmap(volatile void __iomem *addr)
162 {
163         struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
164         if (nfit_res)
165                 return;
166         return iounmap(addr);
167 }
168 EXPORT_SYMBOL(__wrap_iounmap);
169 
170 void __wrap_memunmap(void *addr)
171 {
172         struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
173 
174         if (nfit_res)
175                 return;
176         return memunmap(addr);
177 }
178 EXPORT_SYMBOL(__wrap_memunmap);
179 
180 static bool nfit_test_release_region(struct device *dev,
181                 struct resource *parent, resource_size_t start,
182                 resource_size_t n);
183 
184 static void nfit_devres_release(struct device *dev, void *data)
185 {
186         struct resource *res = *((struct resource **) data);
187 
188         WARN_ON(!nfit_test_release_region(NULL, &iomem_resource, res->start,
189                         resource_size(res)));
190 }
191 
192 static int match(struct device *dev, void *__res, void *match_data)
193 {
194         struct resource *res = *((struct resource **) __res);
195         resource_size_t start = *((resource_size_t *) match_data);
196 
197         return res->start == start;
198 }
199 
200 static bool nfit_test_release_region(struct device *dev,
201                 struct resource *parent, resource_size_t start,
202                 resource_size_t n)
203 {
204         if (parent == &iomem_resource) {
205                 struct nfit_test_resource *nfit_res = get_nfit_res(start);
206 
207                 if (nfit_res) {
208                         struct nfit_test_request *req;
209                         struct resource *res = NULL;
210 
211                         if (dev) {
212                                 devres_release(dev, nfit_devres_release, match,
213                                                 &start);
214                                 return true;
215                         }
216 
217                         spin_lock(&nfit_res->lock);
218                         list_for_each_entry(req, &nfit_res->requests, list)
219                                 if (req->res.start == start) {
220                                         res = &req->res;
221                                         list_del(&req->list);
222                                         break;
223                                 }
224                         spin_unlock(&nfit_res->lock);
225 
226                         WARN(!res || resource_size(res) != n,
227                                         "%s: start: %llx n: %llx mismatch: %pr\n",
228                                                 __func__, start, n, res);
229                         if (res)
230                                 kfree(req);
231                         return true;
232                 }
233         }
234         return false;
235 }
236 
237 static struct resource *nfit_test_request_region(struct device *dev,
238                 struct resource *parent, resource_size_t start,
239                 resource_size_t n, const char *name, int flags)
240 {
241         struct nfit_test_resource *nfit_res;
242 
243         if (parent == &iomem_resource) {
244                 nfit_res = get_nfit_res(start);
245                 if (nfit_res) {
246                         struct nfit_test_request *req;
247                         struct resource *res = NULL;
248 
249                         if (start + n > nfit_res->res.start
250                                         + resource_size(&nfit_res->res)) {
251                                 pr_debug("%s: start: %llx n: %llx overflow: %pr\n",
252                                                 __func__, start, n,
253                                                 &nfit_res->res);
254                                 return NULL;
255                         }
256 
257                         spin_lock(&nfit_res->lock);
258                         list_for_each_entry(req, &nfit_res->requests, list)
259                                 if (start == req->res.start) {
260                                         res = &req->res;
261                                         break;
262                                 }
263                         spin_unlock(&nfit_res->lock);
264 
265                         if (res) {
266                                 WARN(1, "%pr already busy\n", res);
267                                 return NULL;
268                         }
269 
270                         req = kzalloc(sizeof(*req), GFP_KERNEL);
271                         if (!req)
272                                 return NULL;
273                         INIT_LIST_HEAD(&req->list);
274                         res = &req->res;
275 
276                         res->start = start;
277                         res->end = start + n - 1;
278                         res->name = name;
279                         res->flags = resource_type(parent);
280                         res->flags |= IORESOURCE_BUSY | flags;
281                         spin_lock(&nfit_res->lock);
282                         list_add(&req->list, &nfit_res->requests);
283                         spin_unlock(&nfit_res->lock);
284 
285                         if (dev) {
286                                 struct resource **d;
287 
288                                 d = devres_alloc(nfit_devres_release,
289                                                 sizeof(struct resource *),
290                                                 GFP_KERNEL);
291                                 if (!d)
292                                         return NULL;
293                                 *d = res;
294                                 devres_add(dev, d);
295                         }
296 
297                         pr_debug("%s: %pr\n", __func__, res);
298                         return res;
299                 }
300         }
301         if (dev)
302                 return __devm_request_region(dev, parent, start, n, name);
303         return __request_region(parent, start, n, name, flags);
304 }
305 
306 struct resource *__wrap___request_region(struct resource *parent,
307                 resource_size_t start, resource_size_t n, const char *name,
308                 int flags)
309 {
310         return nfit_test_request_region(NULL, parent, start, n, name, flags);
311 }
312 EXPORT_SYMBOL(__wrap___request_region);
313 
314 int __wrap_insert_resource(struct resource *parent, struct resource *res)
315 {
316         if (get_nfit_res(res->start))
317                 return 0;
318         return insert_resource(parent, res);
319 }
320 EXPORT_SYMBOL(__wrap_insert_resource);
321 
322 int __wrap_remove_resource(struct resource *res)
323 {
324         if (get_nfit_res(res->start))
325                 return 0;
326         return remove_resource(res);
327 }
328 EXPORT_SYMBOL(__wrap_remove_resource);
329 
330 struct resource *__wrap___devm_request_region(struct device *dev,
331                 struct resource *parent, resource_size_t start,
332                 resource_size_t n, const char *name)
333 {
334         if (!dev)
335                 return NULL;
336         return nfit_test_request_region(dev, parent, start, n, name, 0);
337 }
338 EXPORT_SYMBOL(__wrap___devm_request_region);
339 
340 void __wrap___release_region(struct resource *parent, resource_size_t start,
341                 resource_size_t n)
342 {
343         if (!nfit_test_release_region(NULL, parent, start, n))
344                 __release_region(parent, start, n);
345 }
346 EXPORT_SYMBOL(__wrap___release_region);
347 
348 void __wrap___devm_release_region(struct device *dev, struct resource *parent,
349                 resource_size_t start, resource_size_t n)
350 {
351         if (!nfit_test_release_region(dev, parent, start, n))
352                 __devm_release_region(dev, parent, start, n);
353 }
354 EXPORT_SYMBOL(__wrap___devm_release_region);
355 
356 acpi_status __wrap_acpi_evaluate_object(acpi_handle handle, acpi_string path,
357                 struct acpi_object_list *p, struct acpi_buffer *buf)
358 {
359         struct nfit_test_resource *nfit_res = get_nfit_res((long) handle);
360         union acpi_object **obj;
361 
362         if (!nfit_res || strcmp(path, "_FIT") || !buf)
363                 return acpi_evaluate_object(handle, path, p, buf);
364 
365         obj = nfit_res->buf;
366         buf->length = sizeof(union acpi_object);
367         buf->pointer = *obj;
368         return AE_OK;
369 }
370 EXPORT_SYMBOL(__wrap_acpi_evaluate_object);
371 
372 union acpi_object * __wrap_acpi_evaluate_dsm(acpi_handle handle, const guid_t *guid,
373                 u64 rev, u64 func, union acpi_object *argv4)
374 {
375         union acpi_object *obj = ERR_PTR(-ENXIO);
376         struct iomap_ops *ops;
377 
378         rcu_read_lock();
379         ops = list_first_or_null_rcu(&iomap_head, typeof(*ops), list);
380         if (ops)
381                 obj = ops->evaluate_dsm(handle, guid, rev, func, argv4);
382         rcu_read_unlock();
383 
384         if (IS_ERR(obj))
385                 return acpi_evaluate_dsm(handle, guid, rev, func, argv4);
386         return obj;
387 }
388 EXPORT_SYMBOL(__wrap_acpi_evaluate_dsm);
389 
390 MODULE_LICENSE("GPL v2");
391 

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