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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
17static LIST_HEAD(iomap_head);
18
19static 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
27void 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}
34EXPORT_SYMBOL(nfit_test_setup);
35
36void nfit_test_teardown(void)
37{
38 list_del_rcu(&iomap_ops.list);
39 synchronize_rcu();
40}
41EXPORT_SYMBOL(nfit_test_teardown);
42
43static 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
53struct 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}
63EXPORT_SYMBOL(get_nfit_res);
64
65void __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
76void __iomem *__wrap_devm_ioremap_nocache(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_nocache(dev, offset, size);
85}
86EXPORT_SYMBOL(__wrap_devm_ioremap_nocache);
87
88void *__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}
97EXPORT_SYMBOL(__wrap_devm_memremap);
98
99static 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
118static 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
126void *__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 pgmap->dev = dev;
136 if (!pgmap->ref) {
137 if (pgmap->ops && (pgmap->ops->kill || pgmap->ops->cleanup))
138 return ERR_PTR(-EINVAL);
139
140 init_completion(&pgmap->done);
141 error = percpu_ref_init(&pgmap->internal_ref,
142 dev_pagemap_percpu_release, 0, GFP_KERNEL);
143 if (error)
144 return ERR_PTR(error);
145 pgmap->ref = &pgmap->internal_ref;
146 } else {
147 if (!pgmap->ops || !pgmap->ops->kill || !pgmap->ops->cleanup) {
148 WARN(1, "Missing reference count teardown definition\n");
149 return ERR_PTR(-EINVAL);
150 }
151 }
152
153 error = devm_add_action_or_reset(dev, nfit_test_kill, pgmap);
154 if (error)
155 return ERR_PTR(error);
156 return nfit_res->buf + offset - nfit_res->res.start;
157}
158EXPORT_SYMBOL_GPL(__wrap_devm_memremap_pages);
159
160pfn_t __wrap_phys_to_pfn_t(phys_addr_t addr, unsigned long flags)
161{
162 struct nfit_test_resource *nfit_res = get_nfit_res(addr);
163
164 if (nfit_res)
165 flags &= ~PFN_MAP;
166 return phys_to_pfn_t(addr, flags);
167}
168EXPORT_SYMBOL(__wrap_phys_to_pfn_t);
169
170void *__wrap_memremap(resource_size_t offset, size_t size,
171 unsigned long flags)
172{
173 struct nfit_test_resource *nfit_res = get_nfit_res(offset);
174
175 if (nfit_res)
176 return nfit_res->buf + offset - nfit_res->res.start;
177 return memremap(offset, size, flags);
178}
179EXPORT_SYMBOL(__wrap_memremap);
180
181void __wrap_devm_memunmap(struct device *dev, void *addr)
182{
183 struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
184
185 if (nfit_res)
186 return;
187 return devm_memunmap(dev, addr);
188}
189EXPORT_SYMBOL(__wrap_devm_memunmap);
190
191void __iomem *__wrap_ioremap_nocache(resource_size_t offset, unsigned long size)
192{
193 return __nfit_test_ioremap(offset, size, ioremap_nocache);
194}
195EXPORT_SYMBOL(__wrap_ioremap_nocache);
196
197void __iomem *__wrap_ioremap_wc(resource_size_t offset, unsigned long size)
198{
199 return __nfit_test_ioremap(offset, size, ioremap_wc);
200}
201EXPORT_SYMBOL(__wrap_ioremap_wc);
202
203void __wrap_iounmap(volatile void __iomem *addr)
204{
205 struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
206 if (nfit_res)
207 return;
208 return iounmap(addr);
209}
210EXPORT_SYMBOL(__wrap_iounmap);
211
212void __wrap_memunmap(void *addr)
213{
214 struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
215
216 if (nfit_res)
217 return;
218 return memunmap(addr);
219}
220EXPORT_SYMBOL(__wrap_memunmap);
221
222static bool nfit_test_release_region(struct device *dev,
223 struct resource *parent, resource_size_t start,
224 resource_size_t n);
225
226static void nfit_devres_release(struct device *dev, void *data)
227{
228 struct resource *res = *((struct resource **) data);
229
230 WARN_ON(!nfit_test_release_region(NULL, &iomem_resource, res->start,
231 resource_size(res)));
232}
233
234static int match(struct device *dev, void *__res, void *match_data)
235{
236 struct resource *res = *((struct resource **) __res);
237 resource_size_t start = *((resource_size_t *) match_data);
238
239 return res->start == start;
240}
241
242static bool nfit_test_release_region(struct device *dev,
243 struct resource *parent, resource_size_t start,
244 resource_size_t n)
245{
246 if (parent == &iomem_resource) {
247 struct nfit_test_resource *nfit_res = get_nfit_res(start);
248
249 if (nfit_res) {
250 struct nfit_test_request *req;
251 struct resource *res = NULL;
252
253 if (dev) {
254 devres_release(dev, nfit_devres_release, match,
255 &start);
256 return true;
257 }
258
259 spin_lock(&nfit_res->lock);
260 list_for_each_entry(req, &nfit_res->requests, list)
261 if (req->res.start == start) {
262 res = &req->res;
263 list_del(&req->list);
264 break;
265 }
266 spin_unlock(&nfit_res->lock);
267
268 WARN(!res || resource_size(res) != n,
269 "%s: start: %llx n: %llx mismatch: %pr\n",
270 __func__, start, n, res);
271 if (res)
272 kfree(req);
273 return true;
274 }
275 }
276 return false;
277}
278
279static struct resource *nfit_test_request_region(struct device *dev,
280 struct resource *parent, resource_size_t start,
281 resource_size_t n, const char *name, int flags)
282{
283 struct nfit_test_resource *nfit_res;
284
285 if (parent == &iomem_resource) {
286 nfit_res = get_nfit_res(start);
287 if (nfit_res) {
288 struct nfit_test_request *req;
289 struct resource *res = NULL;
290
291 if (start + n > nfit_res->res.start
292 + resource_size(&nfit_res->res)) {
293 pr_debug("%s: start: %llx n: %llx overflow: %pr\n",
294 __func__, start, n,
295 &nfit_res->res);
296 return NULL;
297 }
298
299 spin_lock(&nfit_res->lock);
300 list_for_each_entry(req, &nfit_res->requests, list)
301 if (start == req->res.start) {
302 res = &req->res;
303 break;
304 }
305 spin_unlock(&nfit_res->lock);
306
307 if (res) {
308 WARN(1, "%pr already busy\n", res);
309 return NULL;
310 }
311
312 req = kzalloc(sizeof(*req), GFP_KERNEL);
313 if (!req)
314 return NULL;
315 INIT_LIST_HEAD(&req->list);
316 res = &req->res;
317
318 res->start = start;
319 res->end = start + n - 1;
320 res->name = name;
321 res->flags = resource_type(parent);
322 res->flags |= IORESOURCE_BUSY | flags;
323 spin_lock(&nfit_res->lock);
324 list_add(&req->list, &nfit_res->requests);
325 spin_unlock(&nfit_res->lock);
326
327 if (dev) {
328 struct resource **d;
329
330 d = devres_alloc(nfit_devres_release,
331 sizeof(struct resource *),
332 GFP_KERNEL);
333 if (!d)
334 return NULL;
335 *d = res;
336 devres_add(dev, d);
337 }
338
339 pr_debug("%s: %pr\n", __func__, res);
340 return res;
341 }
342 }
343 if (dev)
344 return __devm_request_region(dev, parent, start, n, name);
345 return __request_region(parent, start, n, name, flags);
346}
347
348struct resource *__wrap___request_region(struct resource *parent,
349 resource_size_t start, resource_size_t n, const char *name,
350 int flags)
351{
352 return nfit_test_request_region(NULL, parent, start, n, name, flags);
353}
354EXPORT_SYMBOL(__wrap___request_region);
355
356int __wrap_insert_resource(struct resource *parent, struct resource *res)
357{
358 if (get_nfit_res(res->start))
359 return 0;
360 return insert_resource(parent, res);
361}
362EXPORT_SYMBOL(__wrap_insert_resource);
363
364int __wrap_remove_resource(struct resource *res)
365{
366 if (get_nfit_res(res->start))
367 return 0;
368 return remove_resource(res);
369}
370EXPORT_SYMBOL(__wrap_remove_resource);
371
372struct resource *__wrap___devm_request_region(struct device *dev,
373 struct resource *parent, resource_size_t start,
374 resource_size_t n, const char *name)
375{
376 if (!dev)
377 return NULL;
378 return nfit_test_request_region(dev, parent, start, n, name, 0);
379}
380EXPORT_SYMBOL(__wrap___devm_request_region);
381
382void __wrap___release_region(struct resource *parent, resource_size_t start,
383 resource_size_t n)
384{
385 if (!nfit_test_release_region(NULL, parent, start, n))
386 __release_region(parent, start, n);
387}
388EXPORT_SYMBOL(__wrap___release_region);
389
390void __wrap___devm_release_region(struct device *dev, struct resource *parent,
391 resource_size_t start, resource_size_t n)
392{
393 if (!nfit_test_release_region(dev, parent, start, n))
394 __devm_release_region(dev, parent, start, n);
395}
396EXPORT_SYMBOL(__wrap___devm_release_region);
397
398acpi_status __wrap_acpi_evaluate_object(acpi_handle handle, acpi_string path,
399 struct acpi_object_list *p, struct acpi_buffer *buf)
400{
401 struct nfit_test_resource *nfit_res = get_nfit_res((long) handle);
402 union acpi_object **obj;
403
404 if (!nfit_res || strcmp(path, "_FIT") || !buf)
405 return acpi_evaluate_object(handle, path, p, buf);
406
407 obj = nfit_res->buf;
408 buf->length = sizeof(union acpi_object);
409 buf->pointer = *obj;
410 return AE_OK;
411}
412EXPORT_SYMBOL(__wrap_acpi_evaluate_object);
413
414union acpi_object * __wrap_acpi_evaluate_dsm(acpi_handle handle, const guid_t *guid,
415 u64 rev, u64 func, union acpi_object *argv4)
416{
417 union acpi_object *obj = ERR_PTR(-ENXIO);
418 struct iomap_ops *ops;
419
420 rcu_read_lock();
421 ops = list_first_or_null_rcu(&iomap_head, typeof(*ops), list);
422 if (ops)
423 obj = ops->evaluate_dsm(handle, guid, rev, func, argv4);
424 rcu_read_unlock();
425
426 if (IS_ERR(obj))
427 return acpi_evaluate_dsm(handle, guid, rev, func, argv4);
428 return obj;
429}
430EXPORT_SYMBOL(__wrap_acpi_evaluate_dsm);
431
432MODULE_LICENSE("GPL v2");
433
