Dan Williams | 1f7df6f | 2015-06-09 20:13:14 -0400 | [diff] [blame] | 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/slab.h> |
| 14 | #include <linux/io.h> |
| 15 | #include "nd-core.h" |
| 16 | #include "nd.h" |
| 17 | |
| 18 | static DEFINE_IDA(region_ida); |
| 19 | |
| 20 | static void nd_region_release(struct device *dev) |
| 21 | { |
| 22 | struct nd_region *nd_region = to_nd_region(dev); |
| 23 | u16 i; |
| 24 | |
| 25 | for (i = 0; i < nd_region->ndr_mappings; i++) { |
| 26 | struct nd_mapping *nd_mapping = &nd_region->mapping[i]; |
| 27 | struct nvdimm *nvdimm = nd_mapping->nvdimm; |
| 28 | |
| 29 | put_device(&nvdimm->dev); |
| 30 | } |
| 31 | ida_simple_remove(®ion_ida, nd_region->id); |
| 32 | kfree(nd_region); |
| 33 | } |
| 34 | |
| 35 | static struct device_type nd_blk_device_type = { |
| 36 | .name = "nd_blk", |
| 37 | .release = nd_region_release, |
| 38 | }; |
| 39 | |
| 40 | static struct device_type nd_pmem_device_type = { |
| 41 | .name = "nd_pmem", |
| 42 | .release = nd_region_release, |
| 43 | }; |
| 44 | |
| 45 | static struct device_type nd_volatile_device_type = { |
| 46 | .name = "nd_volatile", |
| 47 | .release = nd_region_release, |
| 48 | }; |
| 49 | |
Dan Williams | 3d88002 | 2015-05-31 15:02:11 -0400 | [diff] [blame^] | 50 | bool is_nd_pmem(struct device *dev) |
Dan Williams | 1f7df6f | 2015-06-09 20:13:14 -0400 | [diff] [blame] | 51 | { |
| 52 | return dev ? dev->type == &nd_pmem_device_type : false; |
| 53 | } |
| 54 | |
Dan Williams | 3d88002 | 2015-05-31 15:02:11 -0400 | [diff] [blame^] | 55 | bool is_nd_blk(struct device *dev) |
| 56 | { |
| 57 | return dev ? dev->type == &nd_blk_device_type : false; |
| 58 | } |
| 59 | |
Dan Williams | 1f7df6f | 2015-06-09 20:13:14 -0400 | [diff] [blame] | 60 | struct nd_region *to_nd_region(struct device *dev) |
| 61 | { |
| 62 | struct nd_region *nd_region = container_of(dev, struct nd_region, dev); |
| 63 | |
| 64 | WARN_ON(dev->type->release != nd_region_release); |
| 65 | return nd_region; |
| 66 | } |
| 67 | EXPORT_SYMBOL_GPL(to_nd_region); |
| 68 | |
Dan Williams | 3d88002 | 2015-05-31 15:02:11 -0400 | [diff] [blame^] | 69 | /** |
| 70 | * nd_region_to_nstype() - region to an integer namespace type |
| 71 | * @nd_region: region-device to interrogate |
| 72 | * |
| 73 | * This is the 'nstype' attribute of a region as well, an input to the |
| 74 | * MODALIAS for namespace devices, and bit number for a nvdimm_bus to match |
| 75 | * namespace devices with namespace drivers. |
| 76 | */ |
| 77 | int nd_region_to_nstype(struct nd_region *nd_region) |
| 78 | { |
| 79 | if (is_nd_pmem(&nd_region->dev)) { |
| 80 | u16 i, alias; |
| 81 | |
| 82 | for (i = 0, alias = 0; i < nd_region->ndr_mappings; i++) { |
| 83 | struct nd_mapping *nd_mapping = &nd_region->mapping[i]; |
| 84 | struct nvdimm *nvdimm = nd_mapping->nvdimm; |
| 85 | |
| 86 | if (nvdimm->flags & NDD_ALIASING) |
| 87 | alias++; |
| 88 | } |
| 89 | if (alias) |
| 90 | return ND_DEVICE_NAMESPACE_PMEM; |
| 91 | else |
| 92 | return ND_DEVICE_NAMESPACE_IO; |
| 93 | } else if (is_nd_blk(&nd_region->dev)) { |
| 94 | return ND_DEVICE_NAMESPACE_BLK; |
| 95 | } |
| 96 | |
| 97 | return 0; |
| 98 | } |
| 99 | |
Dan Williams | 1f7df6f | 2015-06-09 20:13:14 -0400 | [diff] [blame] | 100 | static ssize_t size_show(struct device *dev, |
| 101 | struct device_attribute *attr, char *buf) |
| 102 | { |
| 103 | struct nd_region *nd_region = to_nd_region(dev); |
| 104 | unsigned long long size = 0; |
| 105 | |
| 106 | if (is_nd_pmem(dev)) { |
| 107 | size = nd_region->ndr_size; |
| 108 | } else if (nd_region->ndr_mappings == 1) { |
| 109 | struct nd_mapping *nd_mapping = &nd_region->mapping[0]; |
| 110 | |
| 111 | size = nd_mapping->size; |
| 112 | } |
| 113 | |
| 114 | return sprintf(buf, "%llu\n", size); |
| 115 | } |
| 116 | static DEVICE_ATTR_RO(size); |
| 117 | |
| 118 | static ssize_t mappings_show(struct device *dev, |
| 119 | struct device_attribute *attr, char *buf) |
| 120 | { |
| 121 | struct nd_region *nd_region = to_nd_region(dev); |
| 122 | |
| 123 | return sprintf(buf, "%d\n", nd_region->ndr_mappings); |
| 124 | } |
| 125 | static DEVICE_ATTR_RO(mappings); |
| 126 | |
Dan Williams | 3d88002 | 2015-05-31 15:02:11 -0400 | [diff] [blame^] | 127 | static ssize_t nstype_show(struct device *dev, |
| 128 | struct device_attribute *attr, char *buf) |
| 129 | { |
| 130 | struct nd_region *nd_region = to_nd_region(dev); |
| 131 | |
| 132 | return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region)); |
| 133 | } |
| 134 | static DEVICE_ATTR_RO(nstype); |
| 135 | |
| 136 | static ssize_t init_namespaces_show(struct device *dev, |
| 137 | struct device_attribute *attr, char *buf) |
| 138 | { |
| 139 | struct nd_region_namespaces *num_ns = dev_get_drvdata(dev); |
| 140 | ssize_t rc; |
| 141 | |
| 142 | nvdimm_bus_lock(dev); |
| 143 | if (num_ns) |
| 144 | rc = sprintf(buf, "%d/%d\n", num_ns->active, num_ns->count); |
| 145 | else |
| 146 | rc = -ENXIO; |
| 147 | nvdimm_bus_unlock(dev); |
| 148 | |
| 149 | return rc; |
| 150 | } |
| 151 | static DEVICE_ATTR_RO(init_namespaces); |
| 152 | |
Dan Williams | 1f7df6f | 2015-06-09 20:13:14 -0400 | [diff] [blame] | 153 | static struct attribute *nd_region_attributes[] = { |
| 154 | &dev_attr_size.attr, |
Dan Williams | 3d88002 | 2015-05-31 15:02:11 -0400 | [diff] [blame^] | 155 | &dev_attr_nstype.attr, |
Dan Williams | 1f7df6f | 2015-06-09 20:13:14 -0400 | [diff] [blame] | 156 | &dev_attr_mappings.attr, |
Dan Williams | 3d88002 | 2015-05-31 15:02:11 -0400 | [diff] [blame^] | 157 | &dev_attr_init_namespaces.attr, |
Dan Williams | 1f7df6f | 2015-06-09 20:13:14 -0400 | [diff] [blame] | 158 | NULL, |
| 159 | }; |
| 160 | |
| 161 | struct attribute_group nd_region_attribute_group = { |
| 162 | .attrs = nd_region_attributes, |
| 163 | }; |
| 164 | EXPORT_SYMBOL_GPL(nd_region_attribute_group); |
| 165 | |
| 166 | static ssize_t mappingN(struct device *dev, char *buf, int n) |
| 167 | { |
| 168 | struct nd_region *nd_region = to_nd_region(dev); |
| 169 | struct nd_mapping *nd_mapping; |
| 170 | struct nvdimm *nvdimm; |
| 171 | |
| 172 | if (n >= nd_region->ndr_mappings) |
| 173 | return -ENXIO; |
| 174 | nd_mapping = &nd_region->mapping[n]; |
| 175 | nvdimm = nd_mapping->nvdimm; |
| 176 | |
| 177 | return sprintf(buf, "%s,%llu,%llu\n", dev_name(&nvdimm->dev), |
| 178 | nd_mapping->start, nd_mapping->size); |
| 179 | } |
| 180 | |
| 181 | #define REGION_MAPPING(idx) \ |
| 182 | static ssize_t mapping##idx##_show(struct device *dev, \ |
| 183 | struct device_attribute *attr, char *buf) \ |
| 184 | { \ |
| 185 | return mappingN(dev, buf, idx); \ |
| 186 | } \ |
| 187 | static DEVICE_ATTR_RO(mapping##idx) |
| 188 | |
| 189 | /* |
| 190 | * 32 should be enough for a while, even in the presence of socket |
| 191 | * interleave a 32-way interleave set is a degenerate case. |
| 192 | */ |
| 193 | REGION_MAPPING(0); |
| 194 | REGION_MAPPING(1); |
| 195 | REGION_MAPPING(2); |
| 196 | REGION_MAPPING(3); |
| 197 | REGION_MAPPING(4); |
| 198 | REGION_MAPPING(5); |
| 199 | REGION_MAPPING(6); |
| 200 | REGION_MAPPING(7); |
| 201 | REGION_MAPPING(8); |
| 202 | REGION_MAPPING(9); |
| 203 | REGION_MAPPING(10); |
| 204 | REGION_MAPPING(11); |
| 205 | REGION_MAPPING(12); |
| 206 | REGION_MAPPING(13); |
| 207 | REGION_MAPPING(14); |
| 208 | REGION_MAPPING(15); |
| 209 | REGION_MAPPING(16); |
| 210 | REGION_MAPPING(17); |
| 211 | REGION_MAPPING(18); |
| 212 | REGION_MAPPING(19); |
| 213 | REGION_MAPPING(20); |
| 214 | REGION_MAPPING(21); |
| 215 | REGION_MAPPING(22); |
| 216 | REGION_MAPPING(23); |
| 217 | REGION_MAPPING(24); |
| 218 | REGION_MAPPING(25); |
| 219 | REGION_MAPPING(26); |
| 220 | REGION_MAPPING(27); |
| 221 | REGION_MAPPING(28); |
| 222 | REGION_MAPPING(29); |
| 223 | REGION_MAPPING(30); |
| 224 | REGION_MAPPING(31); |
| 225 | |
| 226 | static umode_t mapping_visible(struct kobject *kobj, struct attribute *a, int n) |
| 227 | { |
| 228 | struct device *dev = container_of(kobj, struct device, kobj); |
| 229 | struct nd_region *nd_region = to_nd_region(dev); |
| 230 | |
| 231 | if (n < nd_region->ndr_mappings) |
| 232 | return a->mode; |
| 233 | return 0; |
| 234 | } |
| 235 | |
| 236 | static struct attribute *mapping_attributes[] = { |
| 237 | &dev_attr_mapping0.attr, |
| 238 | &dev_attr_mapping1.attr, |
| 239 | &dev_attr_mapping2.attr, |
| 240 | &dev_attr_mapping3.attr, |
| 241 | &dev_attr_mapping4.attr, |
| 242 | &dev_attr_mapping5.attr, |
| 243 | &dev_attr_mapping6.attr, |
| 244 | &dev_attr_mapping7.attr, |
| 245 | &dev_attr_mapping8.attr, |
| 246 | &dev_attr_mapping9.attr, |
| 247 | &dev_attr_mapping10.attr, |
| 248 | &dev_attr_mapping11.attr, |
| 249 | &dev_attr_mapping12.attr, |
| 250 | &dev_attr_mapping13.attr, |
| 251 | &dev_attr_mapping14.attr, |
| 252 | &dev_attr_mapping15.attr, |
| 253 | &dev_attr_mapping16.attr, |
| 254 | &dev_attr_mapping17.attr, |
| 255 | &dev_attr_mapping18.attr, |
| 256 | &dev_attr_mapping19.attr, |
| 257 | &dev_attr_mapping20.attr, |
| 258 | &dev_attr_mapping21.attr, |
| 259 | &dev_attr_mapping22.attr, |
| 260 | &dev_attr_mapping23.attr, |
| 261 | &dev_attr_mapping24.attr, |
| 262 | &dev_attr_mapping25.attr, |
| 263 | &dev_attr_mapping26.attr, |
| 264 | &dev_attr_mapping27.attr, |
| 265 | &dev_attr_mapping28.attr, |
| 266 | &dev_attr_mapping29.attr, |
| 267 | &dev_attr_mapping30.attr, |
| 268 | &dev_attr_mapping31.attr, |
| 269 | NULL, |
| 270 | }; |
| 271 | |
| 272 | struct attribute_group nd_mapping_attribute_group = { |
| 273 | .is_visible = mapping_visible, |
| 274 | .attrs = mapping_attributes, |
| 275 | }; |
| 276 | EXPORT_SYMBOL_GPL(nd_mapping_attribute_group); |
| 277 | |
| 278 | void *nd_region_provider_data(struct nd_region *nd_region) |
| 279 | { |
| 280 | return nd_region->provider_data; |
| 281 | } |
| 282 | EXPORT_SYMBOL_GPL(nd_region_provider_data); |
| 283 | |
| 284 | static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus, |
| 285 | struct nd_region_desc *ndr_desc, struct device_type *dev_type, |
| 286 | const char *caller) |
| 287 | { |
| 288 | struct nd_region *nd_region; |
| 289 | struct device *dev; |
| 290 | u16 i; |
| 291 | |
| 292 | for (i = 0; i < ndr_desc->num_mappings; i++) { |
| 293 | struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i]; |
| 294 | struct nvdimm *nvdimm = nd_mapping->nvdimm; |
| 295 | |
| 296 | if ((nd_mapping->start | nd_mapping->size) % SZ_4K) { |
| 297 | dev_err(&nvdimm_bus->dev, "%s: %s mapping%d is not 4K aligned\n", |
| 298 | caller, dev_name(&nvdimm->dev), i); |
| 299 | |
| 300 | return NULL; |
| 301 | } |
| 302 | } |
| 303 | |
| 304 | nd_region = kzalloc(sizeof(struct nd_region) |
| 305 | + sizeof(struct nd_mapping) * ndr_desc->num_mappings, |
| 306 | GFP_KERNEL); |
| 307 | if (!nd_region) |
| 308 | return NULL; |
| 309 | nd_region->id = ida_simple_get(®ion_ida, 0, 0, GFP_KERNEL); |
| 310 | if (nd_region->id < 0) { |
| 311 | kfree(nd_region); |
| 312 | return NULL; |
| 313 | } |
| 314 | |
| 315 | memcpy(nd_region->mapping, ndr_desc->nd_mapping, |
| 316 | sizeof(struct nd_mapping) * ndr_desc->num_mappings); |
| 317 | for (i = 0; i < ndr_desc->num_mappings; i++) { |
| 318 | struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i]; |
| 319 | struct nvdimm *nvdimm = nd_mapping->nvdimm; |
| 320 | |
| 321 | get_device(&nvdimm->dev); |
| 322 | } |
| 323 | nd_region->ndr_mappings = ndr_desc->num_mappings; |
| 324 | nd_region->provider_data = ndr_desc->provider_data; |
| 325 | dev = &nd_region->dev; |
| 326 | dev_set_name(dev, "region%d", nd_region->id); |
| 327 | dev->parent = &nvdimm_bus->dev; |
| 328 | dev->type = dev_type; |
| 329 | dev->groups = ndr_desc->attr_groups; |
| 330 | nd_region->ndr_size = resource_size(ndr_desc->res); |
| 331 | nd_region->ndr_start = ndr_desc->res->start; |
| 332 | nd_device_register(dev); |
| 333 | |
| 334 | return nd_region; |
| 335 | } |
| 336 | |
| 337 | struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus, |
| 338 | struct nd_region_desc *ndr_desc) |
| 339 | { |
| 340 | return nd_region_create(nvdimm_bus, ndr_desc, &nd_pmem_device_type, |
| 341 | __func__); |
| 342 | } |
| 343 | EXPORT_SYMBOL_GPL(nvdimm_pmem_region_create); |
| 344 | |
| 345 | struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus, |
| 346 | struct nd_region_desc *ndr_desc) |
| 347 | { |
| 348 | if (ndr_desc->num_mappings > 1) |
| 349 | return NULL; |
| 350 | return nd_region_create(nvdimm_bus, ndr_desc, &nd_blk_device_type, |
| 351 | __func__); |
| 352 | } |
| 353 | EXPORT_SYMBOL_GPL(nvdimm_blk_region_create); |
| 354 | |
| 355 | struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus, |
| 356 | struct nd_region_desc *ndr_desc) |
| 357 | { |
| 358 | return nd_region_create(nvdimm_bus, ndr_desc, &nd_volatile_device_type, |
| 359 | __func__); |
| 360 | } |
| 361 | EXPORT_SYMBOL_GPL(nvdimm_volatile_region_create); |