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 <linux/mm.h>
  20 #include "nfit_test.h"
  21
  22 static LIST_HEAD(iomap_head);
  23
  24 static struct iomap_ops {
  25         nfit_test_lookup_fn nfit_test_lookup;
  26         struct list_head list;
  27 } iomap_ops = {
  28         .list = LIST_HEAD_INIT(iomap_ops.list),
  29 };
  30
  31 void nfit_test_setup(nfit_test_lookup_fn lookup)
  32 {
  33         iomap_ops.nfit_test_lookup = lookup;
  34         list_add_rcu(&iomap_ops.list, &iomap_head);
  35 }
  36 EXPORT_SYMBOL(nfit_test_setup);
  37
  38 void nfit_test_teardown(void)
  39 {
  40         list_del_rcu(&iomap_ops.list);
  41         synchronize_rcu();
  42 }
  43 EXPORT_SYMBOL(nfit_test_teardown);
  44
  45 static struct nfit_test_resource *__get_nfit_res(resource_size_t resource)
  46 {
  47         struct iomap_ops *ops;
  48
  49         ops = list_first_or_null_rcu(&iomap_head, typeof(*ops), list);
  50         if (ops)
  51                 return ops->nfit_test_lookup(resource);
  52         return NULL;
  53 }
  54
  55 static struct nfit_test_resource *get_nfit_res(resource_size_t resource)
  56 {
  57         struct nfit_test_resource *res;
  58
  59         rcu_read_lock();
  60         res = __get_nfit_res(resource);
  61         rcu_read_unlock();
  62
  63         return res;
  64 }
  65
  66 void __iomem *__nfit_test_ioremap(resource_size_t offset, unsigned long size,
  67                 void __iomem *(*fallback_fn)(resource_size_t, unsigned long))
  68 {
  69         struct nfit_test_resource *nfit_res = get_nfit_res(offset);
  70
  71         if (nfit_res)
  72                 return (void __iomem *) nfit_res->buf + offset
  73                         - nfit_res->res->start;
  74         return fallback_fn(offset, size);
  75 }
  76
  77 void __iomem *__wrap_devm_ioremap_nocache(struct device *dev,
  78                 resource_size_t offset, unsigned long size)
  79 {
  80         struct nfit_test_resource *nfit_res = get_nfit_res(offset);
  81
  82         if (nfit_res)
  83                 return (void __iomem *) nfit_res->buf + offset
  84                         - nfit_res->res->start;
  85         return devm_ioremap_nocache(dev, offset, size);
  86 }
  87 EXPORT_SYMBOL(__wrap_devm_ioremap_nocache);
  88
  89 void *__wrap_devm_memremap(struct device *dev, resource_size_t offset,
  90                 size_t size, unsigned long flags)
  91 {
  92         struct nfit_test_resource *nfit_res = get_nfit_res(offset);
  93
  94         if (nfit_res)
  95                 return nfit_res->buf + offset - nfit_res->res->start;
  96         return devm_memremap(dev, offset, size, flags);
  97 }
  98 EXPORT_SYMBOL(__wrap_devm_memremap);
  99
 100 #ifdef __HAVE_ARCH_PTE_DEVMAP
 101 #include <linux/memremap.h>
 102 #include <linux/pfn_t.h>
 103
 104 void *__wrap_devm_memremap_pages(struct device *dev, struct resource *res,
 105                 struct percpu_ref *ref, struct vmem_altmap *altmap)
 106 {
 107         resource_size_t offset = res->start;
 108         struct nfit_test_resource *nfit_res = get_nfit_res(offset);
 109
 110         if (nfit_res)
 111                 return nfit_res->buf + offset - nfit_res->res->start;
 112         return devm_memremap_pages(dev, res, ref, altmap);
 113 }
 114 EXPORT_SYMBOL(__wrap_devm_memremap_pages);
 115
 116 pfn_t __wrap_phys_to_pfn_t(dma_addr_t addr, unsigned long flags)
 117 {
 118         struct nfit_test_resource *nfit_res = get_nfit_res(addr);
 119
 120         if (nfit_res)
 121                 flags &= ~PFN_MAP;
 122         return phys_to_pfn_t(addr, flags);
 123 }
 124 EXPORT_SYMBOL(__wrap_phys_to_pfn_t);
 125 #else
 126 /* to be removed post 4.5-rc1 */
 127 void *__wrap_devm_memremap_pages(struct device *dev, struct resource *res)
 128 {
 129         resource_size_t offset = res->start;
 130         struct nfit_test_resource *nfit_res = get_nfit_res(offset);
 131
 132         if (nfit_res)
 133                 return nfit_res->buf + offset - nfit_res->res->start;
 134         return devm_memremap_pages(dev, res);
 135 }
 136 EXPORT_SYMBOL(__wrap_devm_memremap_pages);
 137 #endif
 138
 139 void *__wrap_memremap(resource_size_t offset, size_t size,
 140                 unsigned long flags)
 141 {
 142         struct nfit_test_resource *nfit_res = get_nfit_res(offset);
 143
 144         if (nfit_res)
 145                 return nfit_res->buf + offset - nfit_res->res->start;
 146         return memremap(offset, size, flags);
 147 }
 148 EXPORT_SYMBOL(__wrap_memremap);
 149
 150 void __wrap_devm_memunmap(struct device *dev, void *addr)
 151 {
 152         struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
 153
 154         if (nfit_res)
 155                 return;
 156         return devm_memunmap(dev, addr);
 157 }
 158 EXPORT_SYMBOL(__wrap_devm_memunmap);
 159
 160 void __iomem *__wrap_ioremap_nocache(resource_size_t offset, unsigned long size)
 161 {
 162         return __nfit_test_ioremap(offset, size, ioremap_nocache);
 163 }
 164 EXPORT_SYMBOL(__wrap_ioremap_nocache);
 165
 166 void __iomem *__wrap_ioremap_wc(resource_size_t offset, unsigned long size)
 167 {
 168         return __nfit_test_ioremap(offset, size, ioremap_wc);
 169 }
 170 EXPORT_SYMBOL(__wrap_ioremap_wc);
 171
 172 void __wrap_iounmap(volatile void __iomem *addr)
 173 {
 174         struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
 175         if (nfit_res)
 176                 return;
 177         return iounmap(addr);
 178 }
 179 EXPORT_SYMBOL(__wrap_iounmap);
 180
 181 void __wrap_memunmap(void *addr)
 182 {
 183         struct nfit_test_resource *nfit_res = get_nfit_res((long) addr);
 184
 185         if (nfit_res)
 186                 return;
 187         return memunmap(addr);
 188 }
 189 EXPORT_SYMBOL(__wrap_memunmap);
 190
 191 static struct resource *nfit_test_request_region(struct device *dev,
 192                 struct resource *parent, resource_size_t start,
 193                 resource_size_t n, const char *name, int flags)
 194 {
 195         struct nfit_test_resource *nfit_res;
 196
 197         if (parent == &iomem_resource) {
 198                 nfit_res = get_nfit_res(start);
 199                 if (nfit_res) {
 200                         struct resource *res = nfit_res->res + 1;
 201
 202                         if (start + n > nfit_res->res->start
 203                                         + resource_size(nfit_res->res)) {
 204                                 pr_debug("%s: start: %llx n: %llx overflow: %pr\n",
 205                                                 __func__, start, n,
 206                                                 nfit_res->res);
 207                                 return NULL;
 208                         }
 209
 210                         res->start = start;
 211                         res->end = start + n - 1;
 212                         res->name = name;
 213                         res->flags = resource_type(parent);
 214                         res->flags |= IORESOURCE_BUSY | flags;
 215                         pr_debug("%s: %pr\n", __func__, res);
 216                         return res;
 217                 }
 218         }
 219         if (dev)
 220                 return __devm_request_region(dev, parent, start, n, name);
 221         return __request_region(parent, start, n, name, flags);
 222 }
 223
 224 struct resource *__wrap___request_region(struct resource *parent,
 225                 resource_size_t start, resource_size_t n, const char *name,
 226                 int flags)
 227 {
 228         return nfit_test_request_region(NULL, parent, start, n, name, flags);
 229 }
 230 EXPORT_SYMBOL(__wrap___request_region);
 231
 232 struct resource *__wrap___devm_request_region(struct device *dev,
 233                 struct resource *parent, resource_size_t start,
 234                 resource_size_t n, const char *name)
 235 {
 236         if (!dev)
 237                 return NULL;
 238         return nfit_test_request_region(dev, parent, start, n, name, 0);
 239 }
 240 EXPORT_SYMBOL(__wrap___devm_request_region);
 241
 242 void __wrap___release_region(struct resource *parent, resource_size_t start,
 243                                 resource_size_t n)
 244 {
 245         struct nfit_test_resource *nfit_res;
 246
 247         if (parent == &iomem_resource) {
 248                 nfit_res = get_nfit_res(start);
 249                 if (nfit_res) {
 250                         struct resource *res = nfit_res->res + 1;
 251
 252                         if (start != res->start || resource_size(res) != n)
 253                                 pr_info("%s: start: %llx n: %llx mismatch: %pr\n",
 254                                                 __func__, start, n, res);
 255                         else
 256                                 memset(res, 0, sizeof(*res));
 257                         return;
 258                 }
 259         }
 260         __release_region(parent, start, n);
 261 }
 262 EXPORT_SYMBOL(__wrap___release_region);
 263
 264 MODULE_LICENSE("GPL v2");