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(phys_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"); 265