Dave Young | 5039e31 | 2013-12-20 18:02:21 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Architecture specific sysfs attributes in /sys/kernel |
| 3 | * |
| 4 | * Copyright (C) 2007, Intel Corp. |
| 5 | * Huang Ying <ying.huang@intel.com> |
| 6 | * Copyright (C) 2013, 2013 Red Hat, Inc. |
| 7 | * Dave Young <dyoung@redhat.com> |
| 8 | * |
| 9 | * This file is released under the GPLv2 |
| 10 | */ |
| 11 | |
| 12 | #include <linux/kobject.h> |
| 13 | #include <linux/string.h> |
| 14 | #include <linux/sysfs.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/stat.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/mm.h> |
| 19 | |
Dave Young | 41a34ce | 2014-01-03 11:54:31 +0800 | [diff] [blame] | 20 | #include <asm/io.h> |
Dave Young | 5039e31 | 2013-12-20 18:02:21 +0800 | [diff] [blame] | 21 | #include <asm/setup.h> |
| 22 | |
| 23 | static ssize_t version_show(struct kobject *kobj, |
| 24 | struct kobj_attribute *attr, char *buf) |
| 25 | { |
| 26 | return sprintf(buf, "0x%04x\n", boot_params.hdr.version); |
| 27 | } |
| 28 | |
| 29 | static struct kobj_attribute boot_params_version_attr = __ATTR_RO(version); |
| 30 | |
| 31 | static ssize_t boot_params_data_read(struct file *fp, struct kobject *kobj, |
| 32 | struct bin_attribute *bin_attr, |
| 33 | char *buf, loff_t off, size_t count) |
| 34 | { |
| 35 | memcpy(buf, (void *)&boot_params + off, count); |
| 36 | return count; |
| 37 | } |
| 38 | |
| 39 | static struct bin_attribute boot_params_data_attr = { |
| 40 | .attr = { |
| 41 | .name = "data", |
| 42 | .mode = S_IRUGO, |
| 43 | }, |
| 44 | .read = boot_params_data_read, |
| 45 | .size = sizeof(boot_params), |
| 46 | }; |
| 47 | |
| 48 | static struct attribute *boot_params_version_attrs[] = { |
| 49 | &boot_params_version_attr.attr, |
| 50 | NULL, |
| 51 | }; |
| 52 | |
| 53 | static struct bin_attribute *boot_params_data_attrs[] = { |
| 54 | &boot_params_data_attr, |
| 55 | NULL, |
| 56 | }; |
| 57 | |
| 58 | static struct attribute_group boot_params_attr_group = { |
| 59 | .attrs = boot_params_version_attrs, |
| 60 | .bin_attrs = boot_params_data_attrs, |
| 61 | }; |
| 62 | |
| 63 | static int kobj_to_setup_data_nr(struct kobject *kobj, int *nr) |
| 64 | { |
| 65 | const char *name; |
| 66 | |
| 67 | name = kobject_name(kobj); |
| 68 | return kstrtoint(name, 10, nr); |
| 69 | } |
| 70 | |
| 71 | static int get_setup_data_paddr(int nr, u64 *paddr) |
| 72 | { |
| 73 | int i = 0; |
| 74 | struct setup_data *data; |
| 75 | u64 pa_data = boot_params.hdr.setup_data; |
| 76 | |
| 77 | while (pa_data) { |
| 78 | if (nr == i) { |
| 79 | *paddr = pa_data; |
| 80 | return 0; |
| 81 | } |
| 82 | data = ioremap_cache(pa_data, sizeof(*data)); |
| 83 | if (!data) |
| 84 | return -ENOMEM; |
| 85 | |
| 86 | pa_data = data->next; |
| 87 | iounmap(data); |
| 88 | i++; |
| 89 | } |
| 90 | return -EINVAL; |
| 91 | } |
| 92 | |
| 93 | static int __init get_setup_data_size(int nr, size_t *size) |
| 94 | { |
| 95 | int i = 0; |
| 96 | struct setup_data *data; |
| 97 | u64 pa_data = boot_params.hdr.setup_data; |
| 98 | |
| 99 | while (pa_data) { |
| 100 | data = ioremap_cache(pa_data, sizeof(*data)); |
| 101 | if (!data) |
| 102 | return -ENOMEM; |
| 103 | if (nr == i) { |
| 104 | *size = data->len; |
| 105 | iounmap(data); |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | pa_data = data->next; |
| 110 | iounmap(data); |
| 111 | i++; |
| 112 | } |
| 113 | return -EINVAL; |
| 114 | } |
| 115 | |
| 116 | static ssize_t type_show(struct kobject *kobj, |
| 117 | struct kobj_attribute *attr, char *buf) |
| 118 | { |
| 119 | int nr, ret; |
| 120 | u64 paddr; |
| 121 | struct setup_data *data; |
| 122 | |
| 123 | ret = kobj_to_setup_data_nr(kobj, &nr); |
| 124 | if (ret) |
| 125 | return ret; |
| 126 | |
| 127 | ret = get_setup_data_paddr(nr, &paddr); |
| 128 | if (ret) |
| 129 | return ret; |
| 130 | data = ioremap_cache(paddr, sizeof(*data)); |
| 131 | if (!data) |
| 132 | return -ENOMEM; |
| 133 | |
| 134 | ret = sprintf(buf, "0x%x\n", data->type); |
| 135 | iounmap(data); |
| 136 | return ret; |
| 137 | } |
| 138 | |
| 139 | static ssize_t setup_data_data_read(struct file *fp, |
| 140 | struct kobject *kobj, |
| 141 | struct bin_attribute *bin_attr, |
| 142 | char *buf, |
| 143 | loff_t off, size_t count) |
| 144 | { |
| 145 | int nr, ret = 0; |
| 146 | u64 paddr; |
| 147 | struct setup_data *data; |
| 148 | void *p; |
| 149 | |
| 150 | ret = kobj_to_setup_data_nr(kobj, &nr); |
| 151 | if (ret) |
| 152 | return ret; |
| 153 | |
| 154 | ret = get_setup_data_paddr(nr, &paddr); |
| 155 | if (ret) |
| 156 | return ret; |
| 157 | data = ioremap_cache(paddr, sizeof(*data)); |
| 158 | if (!data) |
| 159 | return -ENOMEM; |
| 160 | |
| 161 | if (off > data->len) { |
| 162 | ret = -EINVAL; |
| 163 | goto out; |
| 164 | } |
| 165 | |
| 166 | if (count > data->len - off) |
| 167 | count = data->len - off; |
| 168 | |
| 169 | if (!count) |
| 170 | goto out; |
| 171 | |
| 172 | ret = count; |
| 173 | p = ioremap_cache(paddr + sizeof(*data), data->len); |
| 174 | if (!p) { |
| 175 | ret = -ENOMEM; |
| 176 | goto out; |
| 177 | } |
| 178 | memcpy(buf, p + off, count); |
| 179 | iounmap(p); |
| 180 | out: |
| 181 | iounmap(data); |
| 182 | return ret; |
| 183 | } |
| 184 | |
| 185 | static struct kobj_attribute type_attr = __ATTR_RO(type); |
| 186 | |
| 187 | static struct bin_attribute data_attr = { |
| 188 | .attr = { |
| 189 | .name = "data", |
| 190 | .mode = S_IRUGO, |
| 191 | }, |
| 192 | .read = setup_data_data_read, |
| 193 | }; |
| 194 | |
| 195 | static struct attribute *setup_data_type_attrs[] = { |
| 196 | &type_attr.attr, |
| 197 | NULL, |
| 198 | }; |
| 199 | |
| 200 | static struct bin_attribute *setup_data_data_attrs[] = { |
| 201 | &data_attr, |
| 202 | NULL, |
| 203 | }; |
| 204 | |
| 205 | static struct attribute_group setup_data_attr_group = { |
| 206 | .attrs = setup_data_type_attrs, |
| 207 | .bin_attrs = setup_data_data_attrs, |
| 208 | }; |
| 209 | |
| 210 | static int __init create_setup_data_node(struct kobject *parent, |
| 211 | struct kobject **kobjp, int nr) |
| 212 | { |
| 213 | int ret = 0; |
| 214 | size_t size; |
| 215 | struct kobject *kobj; |
| 216 | char name[16]; /* should be enough for setup_data nodes numbers */ |
| 217 | snprintf(name, 16, "%d", nr); |
| 218 | |
| 219 | kobj = kobject_create_and_add(name, parent); |
| 220 | if (!kobj) |
| 221 | return -ENOMEM; |
| 222 | |
| 223 | ret = get_setup_data_size(nr, &size); |
| 224 | if (ret) |
| 225 | goto out_kobj; |
| 226 | |
| 227 | data_attr.size = size; |
| 228 | ret = sysfs_create_group(kobj, &setup_data_attr_group); |
| 229 | if (ret) |
| 230 | goto out_kobj; |
| 231 | *kobjp = kobj; |
| 232 | |
| 233 | return 0; |
| 234 | out_kobj: |
| 235 | kobject_put(kobj); |
| 236 | return ret; |
| 237 | } |
| 238 | |
| 239 | static void __init cleanup_setup_data_node(struct kobject *kobj) |
| 240 | { |
| 241 | sysfs_remove_group(kobj, &setup_data_attr_group); |
| 242 | kobject_put(kobj); |
| 243 | } |
| 244 | |
| 245 | static int __init get_setup_data_total_num(u64 pa_data, int *nr) |
| 246 | { |
| 247 | int ret = 0; |
| 248 | struct setup_data *data; |
| 249 | |
| 250 | *nr = 0; |
| 251 | while (pa_data) { |
| 252 | *nr += 1; |
| 253 | data = ioremap_cache(pa_data, sizeof(*data)); |
| 254 | if (!data) { |
| 255 | ret = -ENOMEM; |
| 256 | goto out; |
| 257 | } |
| 258 | pa_data = data->next; |
| 259 | iounmap(data); |
| 260 | } |
| 261 | |
| 262 | out: |
| 263 | return ret; |
| 264 | } |
| 265 | |
| 266 | static int __init create_setup_data_nodes(struct kobject *parent) |
| 267 | { |
| 268 | struct kobject *setup_data_kobj, **kobjp; |
| 269 | u64 pa_data; |
| 270 | int i, j, nr, ret = 0; |
| 271 | |
| 272 | pa_data = boot_params.hdr.setup_data; |
| 273 | if (!pa_data) |
| 274 | return 0; |
| 275 | |
| 276 | setup_data_kobj = kobject_create_and_add("setup_data", parent); |
| 277 | if (!setup_data_kobj) { |
| 278 | ret = -ENOMEM; |
| 279 | goto out; |
| 280 | } |
| 281 | |
| 282 | ret = get_setup_data_total_num(pa_data, &nr); |
| 283 | if (ret) |
| 284 | goto out_setup_data_kobj; |
| 285 | |
| 286 | kobjp = kmalloc(sizeof(*kobjp) * nr, GFP_KERNEL); |
| 287 | if (!kobjp) { |
| 288 | ret = -ENOMEM; |
| 289 | goto out_setup_data_kobj; |
| 290 | } |
| 291 | |
| 292 | for (i = 0; i < nr; i++) { |
| 293 | ret = create_setup_data_node(setup_data_kobj, kobjp + i, i); |
| 294 | if (ret) |
| 295 | goto out_clean_nodes; |
| 296 | } |
| 297 | |
| 298 | kfree(kobjp); |
| 299 | return 0; |
| 300 | |
| 301 | out_clean_nodes: |
| 302 | for (j = i - 1; j > 0; j--) |
| 303 | cleanup_setup_data_node(*(kobjp + j)); |
| 304 | kfree(kobjp); |
| 305 | out_setup_data_kobj: |
| 306 | kobject_put(setup_data_kobj); |
| 307 | out: |
| 308 | return ret; |
| 309 | } |
| 310 | |
| 311 | static int __init boot_params_ksysfs_init(void) |
| 312 | { |
| 313 | int ret; |
| 314 | struct kobject *boot_params_kobj; |
| 315 | |
| 316 | boot_params_kobj = kobject_create_and_add("boot_params", |
| 317 | kernel_kobj); |
| 318 | if (!boot_params_kobj) { |
| 319 | ret = -ENOMEM; |
| 320 | goto out; |
| 321 | } |
| 322 | |
| 323 | ret = sysfs_create_group(boot_params_kobj, &boot_params_attr_group); |
| 324 | if (ret) |
| 325 | goto out_boot_params_kobj; |
| 326 | |
| 327 | ret = create_setup_data_nodes(boot_params_kobj); |
| 328 | if (ret) |
| 329 | goto out_create_group; |
| 330 | |
| 331 | return 0; |
| 332 | out_create_group: |
| 333 | sysfs_remove_group(boot_params_kobj, &boot_params_attr_group); |
| 334 | out_boot_params_kobj: |
| 335 | kobject_put(boot_params_kobj); |
| 336 | out: |
| 337 | return ret; |
| 338 | } |
| 339 | |
| 340 | arch_initcall(boot_params_ksysfs_init); |