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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 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 guid_t *guid,
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, guid, rev, func, argv4);
383         rcu_read_unlock();
384 
385         if (IS_ERR(obj))
386                 return acpi_evaluate_dsm(handle, guid, rev, func, argv4);
387         return obj;
388 }
389 EXPORT_SYMBOL(__wrap_acpi_evaluate_dsm);
390 
391 MODULE_LICENSE("GPL v2");
392 

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