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 (void __iomem *) nfit_res->buf + offset
  93                         - nfit_res->res->start;
  94         return devm_memremap(dev, offset, size, flags);
  95 }
  96 EXPORT_SYMBOL(__wrap_devm_memremap);
  97
  98 void __iomem *__wrap_ioremap_nocache(resource_size_t offset, unsigned long size)
  99 {
 100         return __nfit_test_ioremap(offset, size, ioremap_nocache);
 101 }
 102 EXPORT_SYMBOL(__wrap_ioremap_nocache);
 103
 104 void __iomem *__wrap_ioremap_wc(resource_size_t offset, unsigned long size)
 105 {
 106         return __nfit_test_ioremap(offset, size, ioremap_wc);
 107 }
 108 EXPORT_SYMBOL(__wrap_ioremap_wc);
 109
 110 void __wrap_iounmap(volatile void __iomem *addr)
 111 {
 112         struct nfit_test_resource *nfit_res;
 113
 114         rcu_read_lock();
 115         nfit_res = get_nfit_res((unsigned long) addr);
 116         rcu_read_unlock();
 117         if (nfit_res)
 118                 return;
 119         return iounmap(addr);
 120 }
 121 EXPORT_SYMBOL(__wrap_iounmap);
 122
 123 static struct resource *nfit_test_request_region(struct device *dev,
 124                 struct resource *parent, resource_size_t start,
 125                 resource_size_t n, const char *name, int flags)
 126 {
 127         struct nfit_test_resource *nfit_res;
 128
 129         if (parent == &iomem_resource) {
 130                 rcu_read_lock();
 131                 nfit_res = get_nfit_res(start);
 132                 rcu_read_unlock();
 133                 if (nfit_res) {
 134                         struct resource *res = nfit_res->res + 1;
 135
 136                         if (start + n > nfit_res->res->start
 137                                         + resource_size(nfit_res->res)) {
 138                                 pr_debug("%s: start: %llx n: %llx overflow: %pr\n",
 139                                                 __func__, start, n,
 140                                                 nfit_res->res);
 141                                 return NULL;
 142                         }
 143
 144                         res->start = start;
 145                         res->end = start + n - 1;
 146                         res->name = name;
 147                         res->flags = resource_type(parent);
 148                         res->flags |= IORESOURCE_BUSY | flags;
 149                         pr_debug("%s: %pr\n", __func__, res);
 150                         return res;
 151                 }
 152         }
 153         if (dev)
 154                 return __devm_request_region(dev, parent, start, n, name);
 155         return __request_region(parent, start, n, name, flags);
 156 }
 157
 158 struct resource *__wrap___request_region(struct resource *parent,
 159                 resource_size_t start, resource_size_t n, const char *name,
 160                 int flags)
 161 {
 162         return nfit_test_request_region(NULL, parent, start, n, name, flags);
 163 }
 164 EXPORT_SYMBOL(__wrap___request_region);
 165
 166 struct resource *__wrap___devm_request_region(struct device *dev,
 167                 struct resource *parent, resource_size_t start,
 168                 resource_size_t n, const char *name)
 169 {
 170         if (!dev)
 171                 return NULL;
 172         return nfit_test_request_region(dev, parent, start, n, name, 0);
 173 }
 174 EXPORT_SYMBOL(__wrap___devm_request_region);
 175
 176 void __wrap___release_region(struct resource *parent, resource_size_t start,
 177                                 resource_size_t n)
 178 {
 179         struct nfit_test_resource *nfit_res;
 180
 181         if (parent == &iomem_resource) {
 182                 rcu_read_lock();
 183                 nfit_res = get_nfit_res(start);
 184                 rcu_read_unlock();
 185                 if (nfit_res) {
 186                         struct resource *res = nfit_res->res + 1;
 187
 188                         if (start != res->start || resource_size(res) != n)
 189                                 pr_info("%s: start: %llx n: %llx mismatch: %pr\n",
 190                                                 __func__, start, n, res);
 191                         else
 192                                 memset(res, 0, sizeof(*res));
 193                         return;
 194                 }
 195         }
 196         __release_region(parent, start, n);
 197 }
 198 EXPORT_SYMBOL(__wrap___release_region);
 199
 200 MODULE_LICENSE("GPL v2");