1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
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>
15 #include "nfit_test.h"
17 static LIST_HEAD(iomap_head);
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;
24 .list = LIST_HEAD_INIT(iomap_ops.list),
27 void nfit_test_setup(nfit_test_lookup_fn lookup,
28 nfit_test_evaluate_dsm_fn evaluate)
30 iomap_ops.nfit_test_lookup = lookup;
31 iomap_ops.evaluate_dsm = evaluate;
32 list_add_rcu(&iomap_ops.list, &iomap_head);
34 EXPORT_SYMBOL(nfit_test_setup);
36 void nfit_test_teardown(void)
38 list_del_rcu(&iomap_ops.list);
41 EXPORT_SYMBOL(nfit_test_teardown);
43 static struct nfit_test_resource *__get_nfit_res(resource_size_t resource)
45 struct iomap_ops *ops;
47 ops = list_first_or_null_rcu(&iomap_head, typeof(*ops), list);
49 return ops->nfit_test_lookup(resource);
53 struct nfit_test_resource *get_nfit_res(resource_size_t resource)
55 struct nfit_test_resource *res;
58 res = __get_nfit_res(resource);
63 EXPORT_SYMBOL(get_nfit_res);
65 void __iomem *__nfit_test_ioremap(resource_size_t offset, unsigned long size,
66 void __iomem *(*fallback_fn)(resource_size_t, unsigned long))
68 struct nfit_test_resource *nfit_res = get_nfit_res(offset);
71 return (void __iomem *) nfit_res->buf + offset
72 - nfit_res->res.start;
73 return fallback_fn(offset, size);
76 void __iomem *__wrap_devm_ioremap(struct device *dev,
77 resource_size_t offset, unsigned long size)
79 struct nfit_test_resource *nfit_res = get_nfit_res(offset);
82 return (void __iomem *) nfit_res->buf + offset
83 - nfit_res->res.start;
84 return devm_ioremap(dev, offset, size);
86 EXPORT_SYMBOL(__wrap_devm_ioremap);
88 void *__wrap_devm_memremap(struct device *dev, resource_size_t offset,
89 size_t size, unsigned long flags)
91 struct nfit_test_resource *nfit_res = get_nfit_res(offset);
94 return nfit_res->buf + offset - nfit_res->res.start;
95 return devm_memremap(dev, offset, size, flags);
97 EXPORT_SYMBOL(__wrap_devm_memremap);
99 static void nfit_test_kill(void *_pgmap)
101 struct dev_pagemap *pgmap = _pgmap;
103 WARN_ON(!pgmap || !pgmap->ref);
105 if (pgmap->ops && pgmap->ops->kill)
106 pgmap->ops->kill(pgmap);
108 percpu_ref_kill(pgmap->ref);
110 if (pgmap->ops && pgmap->ops->cleanup) {
111 pgmap->ops->cleanup(pgmap);
113 wait_for_completion(&pgmap->done);
114 percpu_ref_exit(pgmap->ref);
118 static void dev_pagemap_percpu_release(struct percpu_ref *ref)
120 struct dev_pagemap *pgmap =
121 container_of(ref, struct dev_pagemap, internal_ref);
123 complete(&pgmap->done);
126 void *__wrap_devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
129 resource_size_t offset = pgmap->res.start;
130 struct nfit_test_resource *nfit_res = get_nfit_res(offset);
133 return devm_memremap_pages(dev, pgmap);
136 if (pgmap->ops && (pgmap->ops->kill || pgmap->ops->cleanup))
137 return ERR_PTR(-EINVAL);
139 init_completion(&pgmap->done);
140 error = percpu_ref_init(&pgmap->internal_ref,
141 dev_pagemap_percpu_release, 0, GFP_KERNEL);
143 return ERR_PTR(error);
144 pgmap->ref = &pgmap->internal_ref;
146 if (!pgmap->ops || !pgmap->ops->kill || !pgmap->ops->cleanup) {
147 WARN(1, "Missing reference count teardown definition\n");
148 return ERR_PTR(-EINVAL);
152 error = devm_add_action_or_reset(dev, nfit_test_kill, pgmap);
154 return ERR_PTR(error);
155 return nfit_res->buf + offset - nfit_res->res.start;
157 EXPORT_SYMBOL_GPL(__wrap_devm_memremap_pages);
159 pfn_t __wrap_phys_to_pfn_t(phys_addr_t addr, unsigned long flags)
161 struct nfit_test_resource *nfit_res = get_nfit_res(addr);
165 return phys_to_pfn_t(addr, flags);
167 EXPORT_SYMBOL(__wrap_phys_to_pfn_t);
169 void *__wrap_memremap(resource_size_t offset, size_t size,
172 struct nfit_test_resource *nfit_res = get_nfit_res(offset);
175 return nfit_res->buf + offset - nfit_res->res.start;
176 return memremap(offset, size, flags);
178 EXPORT_SYMBOL(__wrap_memremap);
180 void __wrap_devm_memunmap(struct device *dev, void *addr)
182 struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
186 return devm_memunmap(dev, addr);
188 EXPORT_SYMBOL(__wrap_devm_memunmap);
190 void __iomem *__wrap_ioremap(resource_size_t offset, unsigned long size)
192 return __nfit_test_ioremap(offset, size, ioremap);
194 EXPORT_SYMBOL(__wrap_ioremap);
196 void __iomem *__wrap_ioremap_wc(resource_size_t offset, unsigned long size)
198 return __nfit_test_ioremap(offset, size, ioremap_wc);
200 EXPORT_SYMBOL(__wrap_ioremap_wc);
202 void __wrap_iounmap(volatile void __iomem *addr)
204 struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
207 return iounmap(addr);
209 EXPORT_SYMBOL(__wrap_iounmap);
211 void __wrap_memunmap(void *addr)
213 struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
217 return memunmap(addr);
219 EXPORT_SYMBOL(__wrap_memunmap);
221 static bool nfit_test_release_region(struct device *dev,
222 struct resource *parent, resource_size_t start,
225 static void nfit_devres_release(struct device *dev, void *data)
227 struct resource *res = *((struct resource **) data);
229 WARN_ON(!nfit_test_release_region(NULL, &iomem_resource, res->start,
230 resource_size(res)));
233 static int match(struct device *dev, void *__res, void *match_data)
235 struct resource *res = *((struct resource **) __res);
236 resource_size_t start = *((resource_size_t *) match_data);
238 return res->start == start;
241 static bool nfit_test_release_region(struct device *dev,
242 struct resource *parent, resource_size_t start,
245 if (parent == &iomem_resource) {
246 struct nfit_test_resource *nfit_res = get_nfit_res(start);
249 struct nfit_test_request *req;
250 struct resource *res = NULL;
253 devres_release(dev, nfit_devres_release, match,
258 spin_lock(&nfit_res->lock);
259 list_for_each_entry(req, &nfit_res->requests, list)
260 if (req->res.start == start) {
262 list_del(&req->list);
265 spin_unlock(&nfit_res->lock);
267 WARN(!res || resource_size(res) != n,
268 "%s: start: %llx n: %llx mismatch: %pr\n",
269 __func__, start, n, res);
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)
282 struct nfit_test_resource *nfit_res;
284 if (parent == &iomem_resource) {
285 nfit_res = get_nfit_res(start);
287 struct nfit_test_request *req;
288 struct resource *res = NULL;
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",
298 spin_lock(&nfit_res->lock);
299 list_for_each_entry(req, &nfit_res->requests, list)
300 if (start == req->res.start) {
304 spin_unlock(&nfit_res->lock);
307 WARN(1, "%pr already busy\n", res);
311 req = kzalloc(sizeof(*req), GFP_KERNEL);
314 INIT_LIST_HEAD(&req->list);
318 res->end = start + n - 1;
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);
329 d = devres_alloc(nfit_devres_release,
330 sizeof(struct resource *),
338 pr_debug("%s: %pr\n", __func__, res);
343 return __devm_request_region(dev, parent, start, n, name);
344 return __request_region(parent, start, n, name, flags);
347 struct resource *__wrap___request_region(struct resource *parent,
348 resource_size_t start, resource_size_t n, const char *name,
351 return nfit_test_request_region(NULL, parent, start, n, name, flags);
353 EXPORT_SYMBOL(__wrap___request_region);
355 int __wrap_insert_resource(struct resource *parent, struct resource *res)
357 if (get_nfit_res(res->start))
359 return insert_resource(parent, res);
361 EXPORT_SYMBOL(__wrap_insert_resource);
363 int __wrap_remove_resource(struct resource *res)
365 if (get_nfit_res(res->start))
367 return remove_resource(res);
369 EXPORT_SYMBOL(__wrap_remove_resource);
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)
377 return nfit_test_request_region(dev, parent, start, n, name, 0);
379 EXPORT_SYMBOL(__wrap___devm_request_region);
381 void __wrap___release_region(struct resource *parent, resource_size_t start,
384 if (!nfit_test_release_region(NULL, parent, start, n))
385 __release_region(parent, start, n);
387 EXPORT_SYMBOL(__wrap___release_region);
389 void __wrap___devm_release_region(struct device *dev, struct resource *parent,
390 resource_size_t start, resource_size_t n)
392 if (!nfit_test_release_region(dev, parent, start, n))
393 __devm_release_region(dev, parent, start, n);
395 EXPORT_SYMBOL(__wrap___devm_release_region);
397 acpi_status __wrap_acpi_evaluate_object(acpi_handle handle, acpi_string path,
398 struct acpi_object_list *p, struct acpi_buffer *buf)
400 struct nfit_test_resource *nfit_res = get_nfit_res((long) handle);
401 union acpi_object **obj;
403 if (!nfit_res || strcmp(path, "_FIT") || !buf)
404 return acpi_evaluate_object(handle, path, p, buf);
407 buf->length = sizeof(union acpi_object);
411 EXPORT_SYMBOL(__wrap_acpi_evaluate_object);
413 union acpi_object * __wrap_acpi_evaluate_dsm(acpi_handle handle, const guid_t *guid,
414 u64 rev, u64 func, union acpi_object *argv4)
416 union acpi_object *obj = ERR_PTR(-ENXIO);
417 struct iomap_ops *ops;
420 ops = list_first_or_null_rcu(&iomap_head, typeof(*ops), list);
422 obj = ops->evaluate_dsm(handle, guid, rev, func, argv4);
426 return acpi_evaluate_dsm(handle, guid, rev, func, argv4);
429 EXPORT_SYMBOL(__wrap_acpi_evaluate_dsm);
431 MODULE_LICENSE("GPL v2");