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

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  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->res.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 

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