summaryrefslogtreecommitdiff
path: root/tools/testing/nvdimm/test/iomap.c
blob: b752ce47ead3c9599c01f5c476c26ac8431a42b6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
 */
#include <linux/memremap.h>
#include <linux/rculist.h>
#include <linux/export.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/pfn_t.h>
#include <linux/acpi.h>
#include <linux/io.h>
#include <linux/mm.h>
#include "nfit_test.h"

static LIST_HEAD(iomap_head);

static struct iomap_ops {
	nfit_test_lookup_fn nfit_test_lookup;
	nfit_test_evaluate_dsm_fn evaluate_dsm;
	struct list_head list;
} iomap_ops = {
	.list = LIST_HEAD_INIT(iomap_ops.list),
};

void nfit_test_setup(nfit_test_lookup_fn lookup,
		nfit_test_evaluate_dsm_fn evaluate)
{
	iomap_ops.nfit_test_lookup = lookup;
	iomap_ops.evaluate_dsm = evaluate;
	list_add_rcu(&iomap_ops.list, &iomap_head);
}
EXPORT_SYMBOL(nfit_test_setup);

void nfit_test_teardown(void)
{
	list_del_rcu(&iomap_ops.list);
	synchronize_rcu();
}
EXPORT_SYMBOL(nfit_test_teardown);

static struct nfit_test_resource *__get_nfit_res(resource_size_t resource)
{
	struct iomap_ops *ops;

	ops = list_first_or_null_rcu(&iomap_head, typeof(*ops), list);
	if (ops)
		return ops->nfit_test_lookup(resource);
	return NULL;
}

struct nfit_test_resource *get_nfit_res(resource_size_t resource)
{
	struct nfit_test_resource *res;

	rcu_read_lock();
	res = __get_nfit_res(resource);
	rcu_read_unlock();

	return res;
}
EXPORT_SYMBOL(get_nfit_res);

static void __iomem *__nfit_test_ioremap(resource_size_t offset, unsigned long size,
		void __iomem *(*fallback_fn)(resource_size_t, unsigned long))
{
	struct nfit_test_resource *nfit_res = get_nfit_res(offset);

	if (nfit_res)
		return (void __iomem *) nfit_res->buf + offset
			- nfit_res->res.start;
	return fallback_fn(offset, size);
}

void __iomem *__wrap_devm_ioremap(struct device *dev,
		resource_size_t offset, unsigned long size)
{
	struct nfit_test_resource *nfit_res = get_nfit_res(offset);

	if (nfit_res)
		return (void __iomem *) nfit_res->buf + offset
			- nfit_res->res.start;
	return devm_ioremap(dev, offset, size);
}
EXPORT_SYMBOL(__wrap_devm_ioremap);

void *__wrap_devm_memremap(struct device *dev, resource_size_t offset,
		size_t size, unsigned long flags)
{
	struct nfit_test_resource *nfit_res = get_nfit_res(offset);

	if (nfit_res)
		return nfit_res->buf + offset - nfit_res->res.start;
	return devm_memremap(dev, offset, size, flags);
}
EXPORT_SYMBOL(__wrap_devm_memremap);

static void nfit_test_kill(void *_pgmap)
{
	struct dev_pagemap *pgmap = _pgmap;

	WARN_ON(!pgmap);

	percpu_ref_kill(&pgmap->ref);

	wait_for_completion(&pgmap->done);
	percpu_ref_exit(&pgmap->ref);
}

static void dev_pagemap_percpu_release(struct percpu_ref *ref)
{
	struct dev_pagemap *pgmap = container_of(ref, struct dev_pagemap, ref);

	complete(&pgmap->done);
}

void *__wrap_devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
{
	int error;
	resource_size_t offset = pgmap->range.start;
	struct nfit_test_resource *nfit_res = get_nfit_res(offset);

	if (!nfit_res)
		return devm_memremap_pages(dev, pgmap);

	init_completion(&pgmap->done);
	error = percpu_ref_init(&pgmap->ref, dev_pagemap_percpu_release, 0,
				GFP_KERNEL);
	if (error)
		return ERR_PTR(error);

	error = devm_add_action_or_reset(dev, nfit_test_kill, pgmap);
	if (error)
		return ERR_PTR(error);
	return nfit_res->buf + offset - nfit_res->res.start;
}
EXPORT_SYMBOL_GPL(__wrap_devm_memremap_pages);

pfn_t __wrap_phys_to_pfn_t(phys_addr_t addr, unsigned long flags)
{
	struct nfit_test_resource *nfit_res = get_nfit_res(addr);

	if (nfit_res)
		flags &= ~PFN_MAP;
        return phys_to_pfn_t(addr, flags);
}
EXPORT_SYMBOL(__wrap_phys_to_pfn_t);

void *__wrap_memremap(resource_size_t offset, size_t size,
		unsigned long flags)
{
	struct nfit_test_resource *nfit_res = get_nfit_res(offset);

	if (nfit_res)
		return nfit_res->buf + offset - nfit_res->res.start;
	return memremap(offset, size, flags);
}
EXPORT_SYMBOL(__wrap_memremap);

void __wrap_devm_memunmap(struct device *dev, void *addr)
{
	struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);

	if (nfit_res)
		return;
	return devm_memunmap(dev, addr);
}
EXPORT_SYMBOL(__wrap_devm_memunmap);

void __iomem *__wrap_ioremap(resource_size_t offset, unsigned long size)
{
	return __nfit_test_ioremap(offset, size, ioremap);
}
EXPORT_SYMBOL(__wrap_ioremap);

void __iomem *__wrap_ioremap_wc(resource_size_t offset, unsigned long size)
{
	return __nfit_test_ioremap(offset, size, ioremap_wc);
}
EXPORT_SYMBOL(__wrap_ioremap_wc);

void __wrap_iounmap(volatile void __iomem *addr)
{
	struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
	if (nfit_res)
		return;
	return iounmap(addr);
}
EXPORT_SYMBOL(__wrap_iounmap);

void __wrap_memunmap(void *addr)
{
	struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);

	if (nfit_res)
		return;
	return memunmap(addr);
}
EXPORT_SYMBOL(__wrap_memunmap);

static bool nfit_test_release_region(struct device *dev,
		struct resource *parent, resource_size_t start,
		resource_size_t n);

static void nfit_devres_release(struct device *dev, void *data)
{
	struct resource *res = *((struct resource **) data);

	WARN_ON(!nfit_test_release_region(NULL, &iomem_resource, res->start,
			resource_size(res)));
}

static int match(struct device *dev, void *__res, void *match_data)
{
	struct resource *res = *((struct resource **) __res);
	resource_size_t start = *((resource_size_t *) match_data);

	return res->start == start;
}

static bool nfit_test_release_region(struct device *dev,
		struct resource *parent, resource_size_t start,
		resource_size_t n)
{
	if (parent == &iomem_resource) {
		struct nfit_test_resource *nfit_res = get_nfit_res(start);

		if (nfit_res) {
			struct nfit_test_request *req;
			struct resource *res = NULL;

			if (dev) {
				devres_release(dev, nfit_devres_release, match,
						&start);
				return true;
			}

			spin_lock(&nfit_res->lock);
			list_for_each_entry(req, &nfit_res->requests, list)
				if (req->res.start == start) {
					res = &req->res;
					list_del(&req->list);
					break;
				}
			spin_unlock(&nfit_res->lock);

			WARN(!res || resource_size(res) != n,
					"%s: start: %llx n: %llx mismatch: %pr\n",
						__func__, start, n, res);
			if (res)
				kfree(req);
			return true;
		}
	}
	return false;
}

static struct resource *nfit_test_request_region(struct device *dev,
		struct resource *parent, resource_size_t start,
		resource_size_t n, const char *name, int flags)
{
	struct nfit_test_resource *nfit_res;

	if (parent == &iomem_resource) {
		nfit_res = get_nfit_res(start);
		if (nfit_res) {
			struct nfit_test_request *req;
			struct resource *res = NULL;

			if (start + n > nfit_res->res.start
					+ resource_size(&nfit_res->res)) {
				pr_debug("%s: start: %llx n: %llx overflow: %pr\n",
						__func__, start, n,
						&nfit_res->res);
				return NULL;
			}

			spin_lock(&nfit_res->lock);
			list_for_each_entry(req, &nfit_res->requests, list)
				if (start == req->res.start) {
					res = &req->res;
					break;
				}
			spin_unlock(&nfit_res->lock);

			if (res) {
				WARN(1, "%pr already busy\n", res);
				return NULL;
			}

			req = kzalloc(sizeof(*req), GFP_KERNEL);
			if (!req)
				return NULL;
			INIT_LIST_HEAD(&req->list);
			res = &req->res;

			res->start = start;
			res->end = start + n - 1;
			res->name = name;
			res->flags = resource_type(parent);
			res->flags |= IORESOURCE_BUSY | flags;
			spin_lock(&nfit_res->lock);
			list_add(&req->list, &nfit_res->requests);
			spin_unlock(&nfit_res->lock);

			if (dev) {
				struct resource **d;

				d = devres_alloc(nfit_devres_release,
						sizeof(struct resource *),
						GFP_KERNEL);
				if (!d)
					return NULL;
				*d = res;
				devres_add(dev, d);
			}

			pr_debug("%s: %pr\n", __func__, res);
			return res;
		}
	}
	if (dev)
		return __devm_request_region(dev, parent, start, n, name);
	return __request_region(parent, start, n, name, flags);
}

struct resource *__wrap___request_region(struct resource *parent,
		resource_size_t start, resource_size_t n, const char *name,
		int flags)
{
	return nfit_test_request_region(NULL, parent, start, n, name, flags);
}
EXPORT_SYMBOL(__wrap___request_region);

int __wrap_insert_resource(struct resource *parent, struct resource *res)
{
	if (get_nfit_res(res->start))
		return 0;
	return insert_resource(parent, res);
}
EXPORT_SYMBOL(__wrap_insert_resource);

int __wrap_remove_resource(struct resource *res)
{
	if (get_nfit_res(res->start))
		return 0;
	return remove_resource(res);
}
EXPORT_SYMBOL(__wrap_remove_resource);

struct resource *__wrap___devm_request_region(struct device *dev,
		struct resource *parent, resource_size_t start,
		resource_size_t n, const char *name)
{
	if (!dev)
		return NULL;
	return nfit_test_request_region(dev, parent, start, n, name, 0);
}
EXPORT_SYMBOL(__wrap___devm_request_region);

void __wrap___release_region(struct resource *parent, resource_size_t start,
		resource_size_t n)
{
	if (!nfit_test_release_region(NULL, parent, start, n))
		__release_region(parent, start, n);
}
EXPORT_SYMBOL(__wrap___release_region);

void __wrap___devm_release_region(struct device *dev, struct resource *parent,
		resource_size_t start, resource_size_t n)
{
	if (!nfit_test_release_region(dev, parent, start, n))
		__devm_release_region(dev, parent, start, n);
}
EXPORT_SYMBOL(__wrap___devm_release_region);

acpi_status __wrap_acpi_evaluate_object(acpi_handle handle, acpi_string path,
		struct acpi_object_list *p, struct acpi_buffer *buf)
{
	struct nfit_test_resource *nfit_res = get_nfit_res((long) handle);
	union acpi_object **obj;

	if (!nfit_res || strcmp(path, "_FIT") || !buf)
		return acpi_evaluate_object(handle, path, p, buf);

	obj = nfit_res->buf;
	buf->length = sizeof(union acpi_object);
	buf->pointer = *obj;
	return AE_OK;
}
EXPORT_SYMBOL(__wrap_acpi_evaluate_object);

union acpi_object * __wrap_acpi_evaluate_dsm(acpi_handle handle, const guid_t *guid,
		u64 rev, u64 func, union acpi_object *argv4)
{
	union acpi_object *obj = ERR_PTR(-ENXIO);
	struct iomap_ops *ops;

	rcu_read_lock();
	ops = list_first_or_null_rcu(&iomap_head, typeof(*ops), list);
	if (ops)
		obj = ops->evaluate_dsm(handle, guid, rev, func, argv4);
	rcu_read_unlock();

	if (IS_ERR(obj))
		return acpi_evaluate_dsm(handle, guid, rev, func, argv4);
	return obj;
}
EXPORT_SYMBOL(__wrap_acpi_evaluate_dsm);

MODULE_LICENSE("GPL v2");