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
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(new: &iomap_ops.list, head: &iomap_head);
33}
34EXPORT_SYMBOL(nfit_test_setup);
35
36void nfit_test_teardown(void)
37{
38 list_del_rcu(entry: &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
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
74void __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}
84EXPORT_SYMBOL(__wrap_devm_ioremap);
85
86void *__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}
95EXPORT_SYMBOL(__wrap_devm_memremap);
96
97static void nfit_test_kill(void *_pgmap)
98{
99 struct dev_pagemap *pgmap = _pgmap;
100
101 WARN_ON(!pgmap);
102
103 percpu_ref_kill(ref: &pgmap->ref);
104
105 wait_for_completion(&pgmap->done);
106 percpu_ref_exit(ref: &pgmap->ref);
107}
108
109static 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
116void *__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(x: &pgmap->done);
126 error = percpu_ref_init(ref: &pgmap->ref, release: dev_pagemap_percpu_release, flags: 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}
136EXPORT_SYMBOL_GPL(__wrap_devm_memremap_pages);
137
138pfn_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}
146EXPORT_SYMBOL(__wrap_phys_to_pfn_t);
147
148void *__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}
157EXPORT_SYMBOL(__wrap_memremap);
158
159void __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}
167EXPORT_SYMBOL(__wrap_devm_memunmap);
168
169void __iomem *__wrap_ioremap(resource_size_t offset, unsigned long size)
170{
171 return __nfit_test_ioremap(offset, size, ioremap);
172}
173EXPORT_SYMBOL(__wrap_ioremap);
174
175void __iomem *__wrap_ioremap_wc(resource_size_t offset, unsigned long size)
176{
177 return __nfit_test_ioremap(offset, size, ioremap_wc);
178}
179EXPORT_SYMBOL(__wrap_ioremap_wc);
180
181void __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}
188EXPORT_SYMBOL(__wrap_iounmap);
189
190void __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}
198EXPORT_SYMBOL(__wrap_memunmap);
199
200static bool nfit_test_release_region(struct device *dev,
201 struct resource *parent, resource_size_t start,
202 resource_size_t n);
203
204static 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
212static 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
220static 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, release: nfit_devres_release, match,
233 match_data: &start);
234 return true;
235 }
236
237 spin_lock(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(entry: &req->list);
242 break;
243 }
244 spin_unlock(lock: &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(objp: req);
251 return true;
252 }
253 }
254 return false;
255}
256
257static 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(res: &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(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(lock: &nfit_res->lock);
284
285 if (res) {
286 WARN(1, "%pr already busy\n", res);
287 return NULL;
288 }
289
290 req = kzalloc(size: sizeof(*req), GFP_KERNEL);
291 if (!req)
292 return NULL;
293 INIT_LIST_HEAD(list: &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(res: parent);
300 res->flags |= IORESOURCE_BUSY | flags;
301 spin_lock(lock: &nfit_res->lock);
302 list_add(new: &req->list, head: &nfit_res->requests);
303 spin_unlock(lock: &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, res: 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
326struct 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}
332EXPORT_SYMBOL(__wrap___request_region);
333
334int __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, new: res);
339}
340EXPORT_SYMBOL(__wrap_insert_resource);
341
342int __wrap_remove_resource(struct resource *res)
343{
344 if (get_nfit_res(res->start))
345 return 0;
346 return remove_resource(old: res);
347}
348EXPORT_SYMBOL(__wrap_remove_resource);
349
350struct 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, flags: 0);
357}
358EXPORT_SYMBOL(__wrap___devm_request_region);
359
360void __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}
366EXPORT_SYMBOL(__wrap___release_region);
367
368void __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}
374EXPORT_SYMBOL(__wrap___devm_release_region);
375
376acpi_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(object: handle, pathname: path, parameter_objects: p, return_object_buffer: buf);
384
385 obj = nfit_res->buf;
386 buf->length = sizeof(union acpi_object);
387 buf->pointer = *obj;
388 return AE_OK;
389}
390EXPORT_SYMBOL(__wrap_acpi_evaluate_object);
391
392union 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(error: -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(ptr: obj))
405 return acpi_evaluate_dsm(handle, guid, rev, func, argv4);
406 return obj;
407}
408EXPORT_SYMBOL(__wrap_acpi_evaluate_dsm);
409
410MODULE_LICENSE("GPL v2");
411

source code of linux/tools/testing/nvdimm/test/iomap.c