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 __iomem *__wrap_ioremap_cache(resource_size_t offset, unsigned long size) 84 { 85 return __nfit_test_ioremap(offset, size, ioremap_cache); 86 } 87 EXPORT_SYMBOL(__wrap_ioremap_cache); 88 89 void __iomem *__wrap_ioremap_nocache(resource_size_t offset, unsigned long size) 90 { 91 return __nfit_test_ioremap(offset, size, ioremap_nocache); 92 } 93 EXPORT_SYMBOL(__wrap_ioremap_nocache); 94 95 void __iomem *__wrap_ioremap_wt(resource_size_t offset, unsigned long size) 96 { 97 return __nfit_test_ioremap(offset, size, ioremap_wt); 98 } 99 EXPORT_SYMBOL(__wrap_ioremap_wt); 100 101 void __iomem *__wrap_ioremap_wc(resource_size_t offset, unsigned long size) 102 { 103 return __nfit_test_ioremap(offset, size, ioremap_wc); 104 } 105 EXPORT_SYMBOL(__wrap_ioremap_wc); 106 107 void __wrap_iounmap(volatile void __iomem *addr) 108 { 109 struct nfit_test_resource *nfit_res; 110 111 rcu_read_lock(); 112 nfit_res = get_nfit_res((unsigned long) addr); 113 rcu_read_unlock(); 114 if (nfit_res) 115 return; 116 return iounmap(addr); 117 } 118 EXPORT_SYMBOL(__wrap_iounmap); 119 120 struct resource *__wrap___request_region(struct resource *parent, 121 resource_size_t start, resource_size_t n, const char *name, 122 int flags) 123 { 124 struct nfit_test_resource *nfit_res; 125 126 if (parent == &iomem_resource) { 127 rcu_read_lock(); 128 nfit_res = get_nfit_res(start); 129 rcu_read_unlock(); 130 if (nfit_res) { 131 struct resource *res = nfit_res->res + 1; 132 133 if (start + n > nfit_res->res->start 134 + resource_size(nfit_res->res)) { 135 pr_debug("%s: start: %llx n: %llx overflow: %pr\n", 136 __func__, start, n, 137 nfit_res->res); 138 return NULL; 139 } 140 141 res->start = start; 142 res->end = start + n - 1; 143 res->name = name; 144 res->flags = resource_type(parent); 145 res->flags |= IORESOURCE_BUSY | flags; 146 pr_debug("%s: %pr\n", __func__, res); 147 return res; 148 } 149 } 150 return __request_region(parent, start, n, name, flags); 151 } 152 EXPORT_SYMBOL(__wrap___request_region); 153 154 void __wrap___release_region(struct resource *parent, resource_size_t start, 155 resource_size_t n) 156 { 157 struct nfit_test_resource *nfit_res; 158 159 if (parent == &iomem_resource) { 160 rcu_read_lock(); 161 nfit_res = get_nfit_res(start); 162 rcu_read_unlock(); 163 if (nfit_res) { 164 struct resource *res = nfit_res->res + 1; 165 166 if (start != res->start || resource_size(res) != n) 167 pr_info("%s: start: %llx n: %llx mismatch: %pr\n", 168 __func__, start, n, res); 169 else 170 memset(res, 0, sizeof(*res)); 171 return; 172 } 173 } 174 __release_region(parent, start, n); 175 } 176 EXPORT_SYMBOL(__wrap___release_region); 177 178 MODULE_LICENSE("GPL v2"); 179