summaryrefslogtreecommitdiffstats
path: root/tools/testing/nvdimm/test/iomap.c
blob: 9f21b150396b9afc46b28b3f18ab84b18820a9b4 (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
/*
 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */
#include <linux/rculist.h>
#include <linux/export.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/io.h>
#include "nfit_test.h"

static LIST_HEAD(iomap_head);

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

void nfit_test_setup(nfit_test_lookup_fn lookup)
{
	iomap_ops.nfit_test_lookup = lookup;
	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;
}

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;

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

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

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

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

void __wrap_iounmap(volatile void __iomem *addr)
{
	struct nfit_test_resource *nfit_res;

	rcu_read_lock();
	nfit_res = get_nfit_res((unsigned long) addr);
	rcu_read_unlock();
	if (nfit_res)
		return;
	return iounmap(addr);
}
EXPORT_SYMBOL(__wrap_iounmap);

struct resource *__wrap___request_region(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) {
		rcu_read_lock();
		nfit_res = get_nfit_res(start);
		rcu_read_unlock();
		if (nfit_res) {
			struct resource *res = nfit_res->res + 1;

			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;
			}

			res->start = start;
			res->end = start + n - 1;
			res->name = name;
			res->flags = resource_type(parent);
			res->flags |= IORESOURCE_BUSY | flags;
			pr_debug("%s: %pr\n", __func__, res);
			return res;
		}
	}
	return __request_region(parent, start, n, name, flags);
}
EXPORT_SYMBOL(__wrap___request_region);

void __wrap___release_region(struct resource *parent, resource_size_t start,
				resource_size_t n)
{
	struct nfit_test_resource *nfit_res;

	if (parent == &iomem_resource) {
		rcu_read_lock();
		nfit_res = get_nfit_res(start);
		rcu_read_unlock();
		if (nfit_res) {
			struct resource *res = nfit_res->res + 1;

			if (start != res->start || resource_size(res) != n)
				pr_info("%s: start: %llx n: %llx mismatch: %pr\n",
						__func__, start, n, res);
			else
				memset(res, 0, sizeof(*res));
			return;
		}
	}
	__release_region(parent, start, n);
}
EXPORT_SYMBOL(__wrap___release_region);

MODULE_LICENSE("GPL v2");
OpenPOWER on IntegriCloud