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 #define __nfit_test_ioremap(offset, size, fallback_fn) ({ \
66 struct nfit_test_resource *nfit_res = get_nfit_res(offset); \
67 nfit_res ? \
68 (void __iomem *) nfit_res->buf + (offset) \
69 - nfit_res->res.start \
70 : \
71 fallback_fn((offset), (size)) ; \
72 })
73
74 void __iomem *__wrap_devm_ioremap(struct device *dev,
75 resource_size_t offset, unsigned long size)
76 {
77 struct nfit_test_resource *nfit_res = get_nfit_res(offset);
78
79 if (nfit_res)
80 return (void __iomem *) nfit_res->buf + offset
81 - nfit_res->res.start;
82 return devm_ioremap(dev, offset, size);
83 }
84 EXPORT_SYMBOL(__wrap_devm_ioremap);
85
86 void *__wrap_devm_memremap(struct device *dev, resource_size_t offset,
87 size_t size, unsigned long flags)
88 {
89 struct nfit_test_resource *nfit_res = get_nfit_res(offset);
90
91 if (nfit_res)
92 return nfit_res->buf + offset - nfit_res->res.start;
93 return devm_memremap(dev, offset, size, flags);
94 }
95 EXPORT_SYMBOL(__wrap_devm_memremap);
96
97 static void nfit_test_kill(void *_pgmap)
98 {
99 struct dev_pagemap *pgmap = _pgmap;
100
101 WARN_ON(!pgmap);
102
103 percpu_ref_kill(&pgmap->ref);
104
105 wait_for_completion(&pgmap->done);
106 percpu_ref_exit(&pgmap->ref);
107 }
108
109 static void dev_pagemap_percpu_release(struct percpu_ref *ref)
110 {
111 struct dev_pagemap *pgmap = container_of(ref, struct dev_pagemap, ref);
112
113 complete(&pgmap->done);
114 }
115
116 void *__wrap_devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
117 {
118 int error;
119 resource_size_t offset = pgmap->range.start;
120 struct nfit_test_resource *nfit_res = get_nfit_res(offset);
121
122 if (!nfit_res)
123 return devm_memremap_pages(dev, pgmap);
124
125 init_completion(&pgmap->done);
126 error = percpu_ref_init(&pgmap->ref, dev_pagemap_percpu_release, 0,
127 GFP_KERNEL);
128 if (error)
129 return ERR_PTR(error);
130
131 error = devm_add_action_or_reset(dev, nfit_test_kill, pgmap);
132 if (error)
133 return ERR_PTR(error);
134 return nfit_res->buf + offset - nfit_res->res.start;
135 }
136 EXPORT_SYMBOL_GPL(__wrap_devm_memremap_pages);
137
138 pfn_t __wrap_phys_to_pfn_t(phys_addr_t addr, unsigned long flags)
139 {
140 struct nfit_test_resource *nfit_res = get_nfit_res(addr);
141
142 if (nfit_res)
143 flags &= ~PFN_MAP;
144 return phys_to_pfn_t(addr, flags);
145 }
146 EXPORT_SYMBOL(__wrap_phys_to_pfn_t);
147
148 void *__wrap_memremap(resource_size_t offset, size_t size,
149 unsigned long flags)
150 {
151 struct nfit_test_resource *nfit_res = get_nfit_res(offset);
152
153 if (nfit_res)
154 return nfit_res->buf + offset - nfit_res->res.start;
155 return memremap(offset, size, flags);
156 }
157 EXPORT_SYMBOL(__wrap_memremap);
158
159 void __wrap_devm_memunmap(struct device *dev, void *addr)
160 {
161 struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
162
163 if (nfit_res)
164 return;
165 return devm_memunmap(dev, addr);
166 }
167 EXPORT_SYMBOL(__wrap_devm_memunmap);
168
169 void __iomem *__wrap_ioremap(resource_size_t offset, unsigned long size)
170 {
171 return __nfit_test_ioremap(offset, size, ioremap);
172 }
173 EXPORT_SYMBOL(__wrap_ioremap);
174
175 void __iomem *__wrap_ioremap_wc(resource_size_t offset, unsigned long size)
176 {
177 return __nfit_test_ioremap(offset, size, ioremap_wc);
178 }
179 EXPORT_SYMBOL(__wrap_ioremap_wc);
180
181 void __wrap_iounmap(volatile void __iomem *addr)
182 {
183 struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
184 if (nfit_res)
185 return;
186 return iounmap(addr);
187 }
188 EXPORT_SYMBOL(__wrap_iounmap);
189
190 void __wrap_memunmap(void *addr)
191 {
192 struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
193
194 if (nfit_res)
195 return;
196 return memunmap(addr);
197 }
198 EXPORT_SYMBOL(__wrap_memunmap);
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 static void nfit_devres_release(struct device *dev, void *data)
205 {
206 struct resource *res = *((struct resource **) data);
207
208 WARN_ON(!nfit_test_release_region(NULL, &iomem_resource, res->start,
209 resource_size(res)));
210 }
211
212 static int match(struct device *dev, void *__res, void *match_data)
213 {
214 struct resource *res = *((struct resource **) __res);
215 resource_size_t start = *((resource_size_t *) match_data);
216
217 return res->start == start;
218 }
219
220 static bool nfit_test_release_region(struct device *dev,
221 struct resource *parent, resource_size_t start,
222 resource_size_t n)
223 {
224 if (parent == &iomem_resource) {
225 struct nfit_test_resource *nfit_res = get_nfit_res(start);
226
227 if (nfit_res) {
228 struct nfit_test_request *req;
229 struct resource *res = NULL;
230
231 if (dev) {
232 devres_release(dev, nfit_devres_release, match,
233 &start);
234 return true;
235 }
236
237 spin_lock(&nfit_res->lock);
238 list_for_each_entry(req, &nfit_res->requests, list)
239 if (req->res.start == start) {
240 res = &req->res;
241 list_del(&req->list);
242 break;
243 }
244 spin_unlock(&nfit_res->lock);
245
246 WARN(!res || resource_size(res) != n,
247 "%s: start: %llx n: %llx mismatch: %pr\n",
248 __func__, start, n, res);
249 if (res)
250 kfree(req);
251 return true;
252 }
253 }
254 return false;
255 }
256
257 static struct resource *nfit_test_request_region(struct device *dev,
258 struct resource *parent, resource_size_t start,
259 resource_size_t n, const char *name, int flags)
260 {
261 struct nfit_test_resource *nfit_res;
262
263 if (parent == &iomem_resource) {
264 nfit_res = get_nfit_res(start);
265 if (nfit_res) {
266 struct nfit_test_request *req;
267 struct resource *res = NULL;
268
269 if (start + n > nfit_res->res.start
270 + resource_size(&nfit_res->res)) {
271 pr_debug("%s: start: %llx n: %llx overflow: %pr\n",
272 __func__, start, n,
273 &nfit_res->res);
274 return NULL;
275 }
276
277 spin_lock(&nfit_res->lock);
278 list_for_each_entry(req, &nfit_res->requests, list)
279 if (start == req->res.start) {
280 res = &req->res;
281 break;
282 }
283 spin_unlock(&nfit_res->lock);
284
285 if (res) {
286 WARN(1, "%pr already busy\n", res);
287 return NULL;
288 }
289
290 req = kzalloc(sizeof(*req), GFP_KERNEL);
291 if (!req)
292 return NULL;
293 INIT_LIST_HEAD(&req->list);
294 res = &req->res;
295
296 res->start = start;
297 res->end = start + n - 1;
298 res->name = name;
299 res->flags = resource_type(parent);
300 res->flags |= IORESOURCE_BUSY | flags;
301 spin_lock(&nfit_res->lock);
302 list_add(&req->list, &nfit_res->requests);
303 spin_unlock(&nfit_res->lock);
304
305 if (dev) {
306 struct resource **d;
307
308 d = devres_alloc(nfit_devres_release,
309 sizeof(struct resource *),
310 GFP_KERNEL);
311 if (!d)
312 return NULL;
313 *d = res;
314 devres_add(dev, d);
315 }
316
317 pr_debug("%s: %pr\n", __func__, res);
318 return res;
319 }
320 }
321 if (dev)
322 return __devm_request_region(dev, parent, start, n, name);
323 return __request_region(parent, start, n, name, flags);
324 }
325
326 struct resource *__wrap___request_region(struct resource *parent,
327 resource_size_t start, resource_size_t n, const char *name,
328 int flags)
329 {
330 return nfit_test_request_region(NULL, parent, start, n, name, flags);
331 }
332 EXPORT_SYMBOL(__wrap___request_region);
333
334 int __wrap_insert_resource(struct resource *parent, struct resource *res)
335 {
336 if (get_nfit_res(res->start))
337 return 0;
338 return insert_resource(parent, res);
339 }
340 EXPORT_SYMBOL(__wrap_insert_resource);
341
342 int __wrap_remove_resource(struct resource *res)
343 {
344 if (get_nfit_res(res->start))
345 return 0;
346 return remove_resource(res);
347 }
348 EXPORT_SYMBOL(__wrap_remove_resource);
349
350 struct resource *__wrap___devm_request_region(struct device *dev,
351 struct resource *parent, resource_size_t start,
352 resource_size_t n, const char *name)
353 {
354 if (!dev)
355 return NULL;
356 return nfit_test_request_region(dev, parent, start, n, name, 0);
357 }
358 EXPORT_SYMBOL(__wrap___devm_request_region);
359
360 void __wrap___release_region(struct resource *parent, resource_size_t start,
361 resource_size_t n)
362 {
363 if (!nfit_test_release_region(NULL, parent, start, n))
364 __release_region(parent, start, n);
365 }
366 EXPORT_SYMBOL(__wrap___release_region);
367
368 void __wrap___devm_release_region(struct device *dev, struct resource *parent,
369 resource_size_t start, resource_size_t n)
370 {
371 if (!nfit_test_release_region(dev, parent, start, n))
372 __devm_release_region(dev, parent, start, n);
373 }
374 EXPORT_SYMBOL(__wrap___devm_release_region);
375
376 acpi_status __wrap_acpi_evaluate_object(acpi_handle handle, acpi_string path,
377 struct acpi_object_list *p, struct acpi_buffer *buf)
378 {
379 struct nfit_test_resource *nfit_res = get_nfit_res((long) handle);
380 union acpi_object **obj;
381
382 if (!nfit_res || strcmp(path, "_FIT") || !buf)
383 return acpi_evaluate_object(handle, path, p, buf);
384
385 obj = nfit_res->buf;
386 buf->length = sizeof(union acpi_object);
387 buf->pointer = *obj;
388 return AE_OK;
389 }
390 EXPORT_SYMBOL(__wrap_acpi_evaluate_object);
391
392 union acpi_object * __wrap_acpi_evaluate_dsm(acpi_handle handle, const guid_t *guid,
393 u64 rev, u64 func, union acpi_object *argv4)
394 {
395 union acpi_object *obj = ERR_PTR(-ENXIO);
396 struct iomap_ops *ops;
397
398 rcu_read_lock();
399 ops = list_first_or_null_rcu(&iomap_head, typeof(*ops), list);
400 if (ops)
401 obj = ops->evaluate_dsm(handle, guid, rev, func, argv4);
402 rcu_read_unlock();
403
404 if (IS_ERR(obj))
405 return acpi_evaluate_dsm(handle, guid, rev, func, argv4);
406 return obj;
407 }
408 EXPORT_SYMBOL(__wrap_acpi_evaluate_dsm);
409
410 MODULE_DESCRIPTION("NVDIMM unit test");
411 MODULE_LICENSE("GPL v2");
412
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