tools/testing/nvdimm/test/iomap.c

   1 /*
   2  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  */
  13 #include <linux/rculist.h>
  14 #include <linux/export.h>
  15 #include <linux/ioport.h>
  16 #include <linux/module.h>
  17 #include <linux/types.h>
  18 #include <linux/io.h>
  19 #include "nfit_test.h"
  20
  21 static LIST_HEAD(iomap_head);
  22
  23 static struct iomap_ops {
  24         nfit_test_lookup_fn nfit_test_lookup;
  25         struct list_head list;
  26 } iomap_ops = {
  27         .list = LIST_HEAD_INIT(iomap_ops.list),
  28 };
  29
  30 void nfit_test_setup(nfit_test_lookup_fn lookup)
  31 {
  32         iomap_ops.nfit_test_lookup = lookup;
  33         list_add_rcu(&iomap_ops.list, &iomap_head);
  34 }
  35 EXPORT_SYMBOL(nfit_test_setup);
  36
  37 void nfit_test_teardown(void)
  38 {
  39         list_del_rcu(&iomap_ops.list);
  40         synchronize_rcu();
  41 }
  42 EXPORT_SYMBOL(nfit_test_teardown);
  43
  44 static struct nfit_test_resource *get_nfit_res(resource_size_t resource)
  45 {
  46         struct iomap_ops *ops;
  47
  48         ops = list_first_or_null_rcu(&iomap_head, typeof(*ops), list);
  49         if (ops)
  50                 return ops->nfit_test_lookup(resource);
  51         return NULL;
  52 }
  53
  54 void __iomem *__nfit_test_ioremap(resource_size_t offset, unsigned long size,
  55                 void __iomem *(*fallback_fn)(resource_size_t, unsigned long))
  56 {
  57         struct nfit_test_resource *nfit_res;
  58
  59         rcu_read_lock();
  60         nfit_res = get_nfit_res(offset);
  61         rcu_read_unlock();
  62         if (nfit_res)
  63                 return (void __iomem *) nfit_res->buf + offset
  64                         - nfit_res->res->start;
  65         return fallback_fn(offset, size);
  66 }
  67
  68 void __iomem *__wrap_devm_ioremap_nocache(struct device *dev,
  69                 resource_size_t offset, unsigned long size)
  70 {
  71         struct nfit_test_resource *nfit_res;
  72
  73         rcu_read_lock();
  74         nfit_res = get_nfit_res(offset);
  75         rcu_read_unlock();
  76         if (nfit_res)
  77                 return (void __iomem *) nfit_res->buf + offset
  78                         - nfit_res->res->start;
  79         return devm_ioremap_nocache(dev, offset, size);
  80 }
  81 EXPORT_SYMBOL(__wrap_devm_ioremap_nocache);
  82
  83 void *__wrap_devm_memremap(struct device *dev, resource_size_t offset,
  84                 size_t size, unsigned long flags)
  85 {
  86         struct nfit_test_resource *nfit_res;
  87
  88         rcu_read_lock();
  89         nfit_res = get_nfit_res(offset);
  90         rcu_read_unlock();
  91         if (nfit_res)
  92                 return nfit_res->buf + offset - nfit_res->res->start;
  93         return devm_memremap(dev, offset, size, flags);
  94 }
  95 EXPORT_SYMBOL(__wrap_devm_memremap);
  96
  97 void *__wrap_memremap(resource_size_t offset, size_t size,
  98                 unsigned long flags)
  99 {
 100         struct nfit_test_resource *nfit_res;
 101
 102         rcu_read_lock();
 103         nfit_res = get_nfit_res(offset);
 104         rcu_read_unlock();
 105         if (nfit_res)
 106                 return nfit_res->buf + offset - nfit_res->res->start;
 107         return memremap(offset, size, flags);
 108 }
 109 EXPORT_SYMBOL(__wrap_memremap);
 110
 111 void __wrap_devm_memunmap(struct device *dev, void *addr)
 112 {
 113         struct nfit_test_resource *nfit_res;
 114
 115         rcu_read_lock();
 116         nfit_res = get_nfit_res((unsigned long) addr);
 117         rcu_read_unlock();
 118         if (nfit_res)
 119                 return;
 120         return devm_memunmap(dev, addr);
 121 }
 122 EXPORT_SYMBOL(__wrap_devm_memunmap);
 123
 124 void __iomem *__wrap_ioremap_nocache(resource_size_t offset, unsigned long size)
 125 {
 126         return __nfit_test_ioremap(offset, size, ioremap_nocache);
 127 }
 128 EXPORT_SYMBOL(__wrap_ioremap_nocache);
 129
 130 void __iomem *__wrap_ioremap_wc(resource_size_t offset, unsigned long size)
 131 {
 132         return __nfit_test_ioremap(offset, size, ioremap_wc);
 133 }
 134 EXPORT_SYMBOL(__wrap_ioremap_wc);
 135
 136 void __wrap_iounmap(volatile void __iomem *addr)
 137 {
 138         struct nfit_test_resource *nfit_res;
 139
 140         rcu_read_lock();
 141         nfit_res = get_nfit_res((unsigned long) addr);
 142         rcu_read_unlock();
 143         if (nfit_res)
 144                 return;
 145         return iounmap(addr);
 146 }
 147 EXPORT_SYMBOL(__wrap_iounmap);
 148
 149 void __wrap_memunmap(void *addr)
 150 {
 151         struct nfit_test_resource *nfit_res;
 152
 153         rcu_read_lock();
 154         nfit_res = get_nfit_res((unsigned long) addr);
 155         rcu_read_unlock();
 156         if (nfit_res)
 157                 return;
 158         return memunmap(addr);
 159 }
 160 EXPORT_SYMBOL(__wrap_memunmap);
 161
 162 static struct resource *nfit_test_request_region(struct device *dev,
 163                 struct resource *parent, resource_size_t start,
 164                 resource_size_t n, const char *name, int flags)
 165 {
 166         struct nfit_test_resource *nfit_res;
 167
 168         if (parent == &iomem_resource) {
 169                 rcu_read_lock();
 170                 nfit_res = get_nfit_res(start);
 171                 rcu_read_unlock();
 172                 if (nfit_res) {
 173                         struct resource *res = nfit_res->res + 1;
 174
 175                         if (start + n > nfit_res->res->start
 176                                         + resource_size(nfit_res->res)) {
 177                                 pr_debug("%s: start: %llx n: %llx overflow: %pr\n",
 178                                                 __func__, start, n,
 179                                                 nfit_res->res);
 180                                 return NULL;
 181                         }
 182
 183                         res->start = start;
 184                         res->end = start + n - 1;
 185                         res->name = name;
 186                         res->flags = resource_type(parent);
 187                         res->flags |= IORESOURCE_BUSY | flags;
 188                         pr_debug("%s: %pr\n", __func__, res);
 189                         return res;
 190                 }
 191         }
 192         if (dev)
 193                 return __devm_request_region(dev, parent, start, n, name);
 194         return __request_region(parent, start, n, name, flags);
 195 }
 196
 197 struct resource *__wrap___request_region(struct resource *parent,
 198                 resource_size_t start, resource_size_t n, const char *name,
 199                 int flags)
 200 {
 201         return nfit_test_request_region(NULL, parent, start, n, name, flags);
 202 }
 203 EXPORT_SYMBOL(__wrap___request_region);
 204
 205 struct resource *__wrap___devm_request_region(struct device *dev,
 206                 struct resource *parent, resource_size_t start,
 207                 resource_size_t n, const char *name)
 208 {
 209         if (!dev)
 210                 return NULL;
 211         return nfit_test_request_region(dev, parent, start, n, name, 0);
 212 }
 213 EXPORT_SYMBOL(__wrap___devm_request_region);
 214
 215 void __wrap___release_region(struct resource *parent, resource_size_t start,
 216                                 resource_size_t n)
 217 {
 218         struct nfit_test_resource *nfit_res;
 219
 220         if (parent == &iomem_resource) {
 221                 rcu_read_lock();
 222                 nfit_res = get_nfit_res(start);
 223                 rcu_read_unlock();
 224                 if (nfit_res) {
 225                         struct resource *res = nfit_res->res + 1;
 226
 227                         if (start != res->start || resource_size(res) != n)
 228                                 pr_info("%s: start: %llx n: %llx mismatch: %pr\n",
 229                                                 __func__, start, n, res);
 230                         else
 231                                 memset(res, 0, sizeof(*res));
 232                         return;
 233                 }
 234         }
 235         __release_region(parent, start, n);
 236 }
 237 EXPORT_SYMBOL(__wrap___release_region);
 238
 239 MODULE_LICENSE("GPL v2");