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51cf784c DW |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* Copyright(c) 2017-2018 Intel Corporation. All rights reserved. */ | |
89ec9f2c | 3 | #include <linux/memremap.h> |
51cf784c | 4 | #include <linux/device.h> |
d200781e DW |
5 | #include <linux/mutex.h> |
6 | #include <linux/list.h> | |
51cf784c DW |
7 | #include <linux/slab.h> |
8 | #include <linux/dax.h> | |
fcffb6a1 | 9 | #include <linux/io.h> |
51cf784c DW |
10 | #include "dax-private.h" |
11 | #include "bus.h" | |
12 | ||
d200781e DW |
13 | static DEFINE_MUTEX(dax_bus_lock); |
14 | ||
c05ae9d8 VV |
15 | /* |
16 | * All changes to the dax region configuration occur with this lock held | |
17 | * for write. | |
18 | */ | |
19 | DECLARE_RWSEM(dax_region_rwsem); | |
20 | ||
21 | /* | |
22 | * All changes to the dax device configuration occur with this lock held | |
23 | * for write. | |
24 | */ | |
25 | DECLARE_RWSEM(dax_dev_rwsem); | |
26 | ||
d200781e DW |
27 | #define DAX_NAME_LEN 30 |
28 | struct dax_id { | |
29 | struct list_head list; | |
30 | char dev_name[DAX_NAME_LEN]; | |
31 | }; | |
32 | ||
2a81ada3 | 33 | static int dax_bus_uevent(const struct device *dev, struct kobj_uevent_env *env) |
9567da0b DW |
34 | { |
35 | /* | |
36 | * We only ever expect to handle device-dax instances, i.e. the | |
37 | * @type argument to MODULE_ALIAS_DAX_DEVICE() is always zero | |
38 | */ | |
39 | return add_uevent_var(env, "MODALIAS=" DAX_DEVICE_MODALIAS_FMT, 0); | |
40 | } | |
41 | ||
d200781e DW |
42 | static struct dax_device_driver *to_dax_drv(struct device_driver *drv) |
43 | { | |
44 | return container_of(drv, struct dax_device_driver, drv); | |
45 | } | |
46 | ||
47 | static struct dax_id *__dax_match_id(struct dax_device_driver *dax_drv, | |
48 | const char *dev_name) | |
49 | { | |
50 | struct dax_id *dax_id; | |
51 | ||
52 | lockdep_assert_held(&dax_bus_lock); | |
53 | ||
54 | list_for_each_entry(dax_id, &dax_drv->ids, list) | |
55 | if (sysfs_streq(dax_id->dev_name, dev_name)) | |
56 | return dax_id; | |
57 | return NULL; | |
58 | } | |
59 | ||
60 | static int dax_match_id(struct dax_device_driver *dax_drv, struct device *dev) | |
61 | { | |
62 | int match; | |
63 | ||
64 | mutex_lock(&dax_bus_lock); | |
65 | match = !!__dax_match_id(dax_drv, dev_name(dev)); | |
66 | mutex_unlock(&dax_bus_lock); | |
67 | ||
68 | return match; | |
69 | } | |
70 | ||
e9ee9fe3 DW |
71 | static int dax_match_type(struct dax_device_driver *dax_drv, struct device *dev) |
72 | { | |
73 | enum dax_driver_type type = DAXDRV_DEVICE_TYPE; | |
74 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
75 | ||
76 | if (dev_dax->region->res.flags & IORESOURCE_DAX_KMEM) | |
77 | type = DAXDRV_KMEM_TYPE; | |
78 | ||
79 | if (dax_drv->type == type) | |
80 | return 1; | |
81 | ||
82 | /* default to device mode if dax_kmem is disabled */ | |
83 | if (dax_drv->type == DAXDRV_DEVICE_TYPE && | |
84 | !IS_ENABLED(CONFIG_DEV_DAX_KMEM)) | |
85 | return 1; | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
664525b2 DW |
90 | enum id_action { |
91 | ID_REMOVE, | |
92 | ID_ADD, | |
93 | }; | |
94 | ||
d200781e | 95 | static ssize_t do_id_store(struct device_driver *drv, const char *buf, |
664525b2 | 96 | size_t count, enum id_action action) |
d200781e DW |
97 | { |
98 | struct dax_device_driver *dax_drv = to_dax_drv(drv); | |
99 | unsigned int region_id, id; | |
100 | char devname[DAX_NAME_LEN]; | |
101 | struct dax_id *dax_id; | |
102 | ssize_t rc = count; | |
103 | int fields; | |
104 | ||
105 | fields = sscanf(buf, "dax%d.%d", ®ion_id, &id); | |
106 | if (fields != 2) | |
107 | return -EINVAL; | |
108 | sprintf(devname, "dax%d.%d", region_id, id); | |
109 | if (!sysfs_streq(buf, devname)) | |
110 | return -EINVAL; | |
111 | ||
112 | mutex_lock(&dax_bus_lock); | |
113 | dax_id = __dax_match_id(dax_drv, buf); | |
114 | if (!dax_id) { | |
664525b2 | 115 | if (action == ID_ADD) { |
d200781e DW |
116 | dax_id = kzalloc(sizeof(*dax_id), GFP_KERNEL); |
117 | if (dax_id) { | |
75b3d5dc | 118 | strscpy(dax_id->dev_name, buf, DAX_NAME_LEN); |
d200781e DW |
119 | list_add(&dax_id->list, &dax_drv->ids); |
120 | } else | |
121 | rc = -ENOMEM; | |
9de82caa | 122 | } |
664525b2 | 123 | } else if (action == ID_REMOVE) { |
d200781e DW |
124 | list_del(&dax_id->list); |
125 | kfree(dax_id); | |
9de82caa | 126 | } |
d200781e | 127 | mutex_unlock(&dax_bus_lock); |
664525b2 DW |
128 | |
129 | if (rc < 0) | |
130 | return rc; | |
131 | if (action == ID_ADD) | |
132 | rc = driver_attach(drv); | |
133 | if (rc) | |
134 | return rc; | |
135 | return count; | |
d200781e DW |
136 | } |
137 | ||
138 | static ssize_t new_id_store(struct device_driver *drv, const char *buf, | |
139 | size_t count) | |
140 | { | |
664525b2 | 141 | return do_id_store(drv, buf, count, ID_ADD); |
d200781e DW |
142 | } |
143 | static DRIVER_ATTR_WO(new_id); | |
144 | ||
145 | static ssize_t remove_id_store(struct device_driver *drv, const char *buf, | |
146 | size_t count) | |
147 | { | |
664525b2 | 148 | return do_id_store(drv, buf, count, ID_REMOVE); |
d200781e DW |
149 | } |
150 | static DRIVER_ATTR_WO(remove_id); | |
151 | ||
152 | static struct attribute *dax_drv_attrs[] = { | |
153 | &driver_attr_new_id.attr, | |
154 | &driver_attr_remove_id.attr, | |
155 | NULL, | |
156 | }; | |
157 | ATTRIBUTE_GROUPS(dax_drv); | |
158 | ||
9567da0b DW |
159 | static int dax_bus_match(struct device *dev, struct device_driver *drv); |
160 | ||
fc65c4eb JM |
161 | /* |
162 | * Static dax regions are regions created by an external subsystem | |
163 | * nvdimm where a single range is assigned. Its boundaries are by the external | |
164 | * subsystem and are usually limited to one physical memory range. For example, | |
165 | * for PMEM it is usually defined by NVDIMM Namespace boundaries (i.e. a | |
166 | * single contiguous range) | |
167 | * | |
168 | * On dynamic dax regions, the assigned region can be partitioned by dax core | |
169 | * into multiple subdivisions. A subdivision is represented into one | |
170 | * /dev/daxN.M device composed by one or more potentially discontiguous ranges. | |
171 | * | |
172 | * When allocating a dax region, drivers must set whether it's static | |
173 | * (IORESOURCE_DAX_STATIC). On static dax devices, the @pgmap is pre-assigned | |
174 | * to dax core when calling devm_create_dev_dax(), whereas in dynamic dax | |
175 | * devices it is NULL but afterwards allocated by dax core on device ->probe(). | |
176 | * Care is needed to make sure that dynamic dax devices are torn down with a | |
177 | * cleared @pgmap field (see kill_dev_dax()). | |
178 | */ | |
c2f3011e DW |
179 | static bool is_static(struct dax_region *dax_region) |
180 | { | |
181 | return (dax_region->res.flags & IORESOURCE_DAX_STATIC) != 0; | |
182 | } | |
183 | ||
fc65c4eb JM |
184 | bool static_dev_dax(struct dev_dax *dev_dax) |
185 | { | |
186 | return is_static(dev_dax->region); | |
187 | } | |
188 | EXPORT_SYMBOL_GPL(static_dev_dax); | |
189 | ||
60e93dc0 DW |
190 | static u64 dev_dax_size(struct dev_dax *dev_dax) |
191 | { | |
192 | u64 size = 0; | |
193 | int i; | |
194 | ||
c14c647b | 195 | lockdep_assert_held(&dax_dev_rwsem); |
60e93dc0 DW |
196 | |
197 | for (i = 0; i < dev_dax->nr_range; i++) | |
198 | size += range_len(&dev_dax->ranges[i].range); | |
199 | ||
200 | return size; | |
201 | } | |
202 | ||
f11cf813 DW |
203 | static int dax_bus_probe(struct device *dev) |
204 | { | |
205 | struct dax_device_driver *dax_drv = to_dax_drv(dev->driver); | |
206 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
0f3da14a | 207 | struct dax_region *dax_region = dev_dax->region; |
0f3da14a | 208 | int rc; |
c05ae9d8 | 209 | u64 size; |
0f3da14a | 210 | |
c05ae9d8 VV |
211 | rc = down_read_interruptible(&dax_dev_rwsem); |
212 | if (rc) | |
213 | return rc; | |
214 | size = dev_dax_size(dev_dax); | |
215 | up_read(&dax_dev_rwsem); | |
216 | ||
217 | if (size == 0 || dev_dax->id < 0) | |
0f3da14a DW |
218 | return -ENXIO; |
219 | ||
220 | rc = dax_drv->probe(dev_dax); | |
221 | ||
222 | if (rc || is_static(dax_region)) | |
223 | return rc; | |
224 | ||
225 | /* | |
226 | * Track new seed creation only after successful probe of the | |
227 | * previous seed. | |
228 | */ | |
229 | if (dax_region->seed == dev) | |
230 | dax_region->seed = NULL; | |
f11cf813 | 231 | |
0f3da14a | 232 | return 0; |
f11cf813 DW |
233 | } |
234 | ||
fc7a6209 | 235 | static void dax_bus_remove(struct device *dev) |
f11cf813 DW |
236 | { |
237 | struct dax_device_driver *dax_drv = to_dax_drv(dev->driver); | |
238 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
239 | ||
8029968e | 240 | if (dax_drv->remove) |
0d519e0d | 241 | dax_drv->remove(dev_dax); |
f11cf813 DW |
242 | } |
243 | ||
bc22374c | 244 | static const struct bus_type dax_bus_type = { |
9567da0b DW |
245 | .name = "dax", |
246 | .uevent = dax_bus_uevent, | |
247 | .match = dax_bus_match, | |
f11cf813 DW |
248 | .probe = dax_bus_probe, |
249 | .remove = dax_bus_remove, | |
d200781e | 250 | .drv_groups = dax_drv_groups, |
9567da0b DW |
251 | }; |
252 | ||
253 | static int dax_bus_match(struct device *dev, struct device_driver *drv) | |
254 | { | |
d200781e DW |
255 | struct dax_device_driver *dax_drv = to_dax_drv(drv); |
256 | ||
e9ee9fe3 | 257 | if (dax_match_id(dax_drv, dev)) |
d200781e | 258 | return 1; |
e9ee9fe3 | 259 | return dax_match_type(dax_drv, dev); |
9567da0b DW |
260 | } |
261 | ||
51cf784c DW |
262 | /* |
263 | * Rely on the fact that drvdata is set before the attributes are | |
264 | * registered, and that the attributes are unregistered before drvdata | |
265 | * is cleared to assume that drvdata is always valid. | |
266 | */ | |
267 | static ssize_t id_show(struct device *dev, | |
268 | struct device_attribute *attr, char *buf) | |
269 | { | |
270 | struct dax_region *dax_region = dev_get_drvdata(dev); | |
271 | ||
6ebed000 | 272 | return sysfs_emit(buf, "%d\n", dax_region->id); |
51cf784c DW |
273 | } |
274 | static DEVICE_ATTR_RO(id); | |
275 | ||
276 | static ssize_t region_size_show(struct device *dev, | |
277 | struct device_attribute *attr, char *buf) | |
278 | { | |
279 | struct dax_region *dax_region = dev_get_drvdata(dev); | |
280 | ||
6ebed000 VV |
281 | return sysfs_emit(buf, "%llu\n", |
282 | (unsigned long long)resource_size(&dax_region->res)); | |
51cf784c DW |
283 | } |
284 | static struct device_attribute dev_attr_region_size = __ATTR(size, 0444, | |
285 | region_size_show, NULL); | |
286 | ||
6d82120f | 287 | static ssize_t region_align_show(struct device *dev, |
51cf784c DW |
288 | struct device_attribute *attr, char *buf) |
289 | { | |
290 | struct dax_region *dax_region = dev_get_drvdata(dev); | |
291 | ||
6ebed000 | 292 | return sysfs_emit(buf, "%u\n", dax_region->align); |
51cf784c | 293 | } |
6d82120f DW |
294 | static struct device_attribute dev_attr_region_align = |
295 | __ATTR(align, 0400, region_align_show, NULL); | |
51cf784c | 296 | |
c2f3011e DW |
297 | #define for_each_dax_region_resource(dax_region, res) \ |
298 | for (res = (dax_region)->res.child; res; res = res->sibling) | |
299 | ||
300 | static unsigned long long dax_region_avail_size(struct dax_region *dax_region) | |
301 | { | |
302 | resource_size_t size = resource_size(&dax_region->res); | |
303 | struct resource *res; | |
304 | ||
c14c647b | 305 | lockdep_assert_held(&dax_region_rwsem); |
c2f3011e DW |
306 | |
307 | for_each_dax_region_resource(dax_region, res) | |
308 | size -= resource_size(res); | |
309 | return size; | |
310 | } | |
311 | ||
312 | static ssize_t available_size_show(struct device *dev, | |
313 | struct device_attribute *attr, char *buf) | |
314 | { | |
315 | struct dax_region *dax_region = dev_get_drvdata(dev); | |
316 | unsigned long long size; | |
c05ae9d8 | 317 | int rc; |
c2f3011e | 318 | |
c05ae9d8 VV |
319 | rc = down_read_interruptible(&dax_region_rwsem); |
320 | if (rc) | |
321 | return rc; | |
c2f3011e | 322 | size = dax_region_avail_size(dax_region); |
c05ae9d8 | 323 | up_read(&dax_region_rwsem); |
c2f3011e | 324 | |
6ebed000 | 325 | return sysfs_emit(buf, "%llu\n", size); |
c2f3011e DW |
326 | } |
327 | static DEVICE_ATTR_RO(available_size); | |
328 | ||
0f3da14a DW |
329 | static ssize_t seed_show(struct device *dev, |
330 | struct device_attribute *attr, char *buf) | |
331 | { | |
332 | struct dax_region *dax_region = dev_get_drvdata(dev); | |
333 | struct device *seed; | |
334 | ssize_t rc; | |
335 | ||
336 | if (is_static(dax_region)) | |
337 | return -EINVAL; | |
338 | ||
c05ae9d8 VV |
339 | rc = down_read_interruptible(&dax_region_rwsem); |
340 | if (rc) | |
341 | return rc; | |
0f3da14a | 342 | seed = dax_region->seed; |
6ebed000 | 343 | rc = sysfs_emit(buf, "%s\n", seed ? dev_name(seed) : ""); |
c05ae9d8 | 344 | up_read(&dax_region_rwsem); |
0f3da14a DW |
345 | |
346 | return rc; | |
347 | } | |
348 | static DEVICE_ATTR_RO(seed); | |
349 | ||
350 | static ssize_t create_show(struct device *dev, | |
351 | struct device_attribute *attr, char *buf) | |
352 | { | |
353 | struct dax_region *dax_region = dev_get_drvdata(dev); | |
354 | struct device *youngest; | |
355 | ssize_t rc; | |
356 | ||
357 | if (is_static(dax_region)) | |
358 | return -EINVAL; | |
359 | ||
c05ae9d8 VV |
360 | rc = down_read_interruptible(&dax_region_rwsem); |
361 | if (rc) | |
362 | return rc; | |
0f3da14a | 363 | youngest = dax_region->youngest; |
6ebed000 | 364 | rc = sysfs_emit(buf, "%s\n", youngest ? dev_name(youngest) : ""); |
c05ae9d8 | 365 | up_read(&dax_region_rwsem); |
0f3da14a DW |
366 | |
367 | return rc; | |
368 | } | |
369 | ||
c05ae9d8 VV |
370 | static struct dev_dax *__devm_create_dev_dax(struct dev_dax_data *data); |
371 | ||
0f3da14a DW |
372 | static ssize_t create_store(struct device *dev, struct device_attribute *attr, |
373 | const char *buf, size_t len) | |
374 | { | |
375 | struct dax_region *dax_region = dev_get_drvdata(dev); | |
376 | unsigned long long avail; | |
377 | ssize_t rc; | |
378 | int val; | |
379 | ||
380 | if (is_static(dax_region)) | |
381 | return -EINVAL; | |
382 | ||
383 | rc = kstrtoint(buf, 0, &val); | |
384 | if (rc) | |
385 | return rc; | |
386 | if (val != 1) | |
387 | return -EINVAL; | |
388 | ||
c05ae9d8 VV |
389 | rc = down_write_killable(&dax_region_rwsem); |
390 | if (rc) | |
391 | return rc; | |
0f3da14a DW |
392 | avail = dax_region_avail_size(dax_region); |
393 | if (avail == 0) | |
394 | rc = -ENOSPC; | |
395 | else { | |
396 | struct dev_dax_data data = { | |
397 | .dax_region = dax_region, | |
398 | .size = 0, | |
399 | .id = -1, | |
4eca0ef4 | 400 | .memmap_on_memory = false, |
0f3da14a | 401 | }; |
c05ae9d8 | 402 | struct dev_dax *dev_dax = __devm_create_dev_dax(&data); |
0f3da14a DW |
403 | |
404 | if (IS_ERR(dev_dax)) | |
405 | rc = PTR_ERR(dev_dax); | |
406 | else { | |
407 | /* | |
408 | * In support of crafting multiple new devices | |
409 | * simultaneously multiple seeds can be created, | |
410 | * but only the first one that has not been | |
411 | * successfully bound is tracked as the region | |
412 | * seed. | |
413 | */ | |
414 | if (!dax_region->seed) | |
415 | dax_region->seed = &dev_dax->dev; | |
416 | dax_region->youngest = &dev_dax->dev; | |
417 | rc = len; | |
418 | } | |
419 | } | |
c05ae9d8 | 420 | up_write(&dax_region_rwsem); |
0f3da14a DW |
421 | |
422 | return rc; | |
423 | } | |
424 | static DEVICE_ATTR_RW(create); | |
425 | ||
426 | void kill_dev_dax(struct dev_dax *dev_dax) | |
427 | { | |
428 | struct dax_device *dax_dev = dev_dax->dax_dev; | |
429 | struct inode *inode = dax_inode(dax_dev); | |
430 | ||
431 | kill_dax(dax_dev); | |
432 | unmap_mapping_range(inode->i_mapping, 0, 0, 1); | |
fc65c4eb JM |
433 | |
434 | /* | |
435 | * Dynamic dax region have the pgmap allocated via dev_kzalloc() | |
436 | * and thus freed by devm. Clear the pgmap to not have stale pgmap | |
437 | * ranges on probe() from previous reconfigurations of region devices. | |
438 | */ | |
439 | if (!static_dev_dax(dev_dax)) | |
440 | dev_dax->pgmap = NULL; | |
0f3da14a DW |
441 | } |
442 | EXPORT_SYMBOL_GPL(kill_dev_dax); | |
443 | ||
6268d7da | 444 | static void trim_dev_dax_range(struct dev_dax *dev_dax) |
0f3da14a | 445 | { |
6268d7da DW |
446 | int i = dev_dax->nr_range - 1; |
447 | struct range *range = &dev_dax->ranges[i].range; | |
0f3da14a | 448 | struct dax_region *dax_region = dev_dax->region; |
0f3da14a | 449 | |
c14c647b | 450 | lockdep_assert_held_write(&dax_region_rwsem); |
6268d7da DW |
451 | dev_dbg(&dev_dax->dev, "delete range[%d]: %#llx:%#llx\n", i, |
452 | (unsigned long long)range->start, | |
453 | (unsigned long long)range->end); | |
454 | ||
455 | __release_region(&dax_region->res, range->start, range_len(range)); | |
456 | if (--dev_dax->nr_range == 0) { | |
457 | kfree(dev_dax->ranges); | |
458 | dev_dax->ranges = NULL; | |
60e93dc0 | 459 | } |
6268d7da DW |
460 | } |
461 | ||
462 | static void free_dev_dax_ranges(struct dev_dax *dev_dax) | |
463 | { | |
464 | while (dev_dax->nr_range) | |
465 | trim_dev_dax_range(dev_dax); | |
0f3da14a DW |
466 | } |
467 | ||
6f6544f2 | 468 | static void unregister_dev_dax(void *dev) |
0f3da14a DW |
469 | { |
470 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
471 | ||
472 | dev_dbg(dev, "%s\n", __func__); | |
473 | ||
6f6544f2 | 474 | down_write(&dax_region_rwsem); |
0f3da14a | 475 | kill_dev_dax(dev_dax); |
0f3da14a | 476 | device_del(dev); |
e686c325 | 477 | free_dev_dax_ranges(dev_dax); |
0f3da14a | 478 | put_device(dev); |
c05ae9d8 VV |
479 | up_write(&dax_region_rwsem); |
480 | } | |
481 | ||
70aab281 DW |
482 | static void dax_region_free(struct kref *kref) |
483 | { | |
484 | struct dax_region *dax_region; | |
485 | ||
486 | dax_region = container_of(kref, struct dax_region, kref); | |
487 | kfree(dax_region); | |
488 | } | |
489 | ||
2532f416 | 490 | static void dax_region_put(struct dax_region *dax_region) |
70aab281 DW |
491 | { |
492 | kref_put(&dax_region->kref, dax_region_free); | |
493 | } | |
70aab281 | 494 | |
0f3da14a DW |
495 | /* a return value >= 0 indicates this invocation invalidated the id */ |
496 | static int __free_dev_dax_id(struct dev_dax *dev_dax) | |
497 | { | |
70aab281 | 498 | struct dax_region *dax_region; |
0f3da14a DW |
499 | int rc = dev_dax->id; |
500 | ||
c14c647b | 501 | lockdep_assert_held_write(&dax_dev_rwsem); |
0f3da14a | 502 | |
70aab281 | 503 | if (!dev_dax->dyn_id || dev_dax->id < 0) |
0f3da14a | 504 | return -1; |
70aab281 | 505 | dax_region = dev_dax->region; |
0f3da14a | 506 | ida_free(&dax_region->ida, dev_dax->id); |
70aab281 | 507 | dax_region_put(dax_region); |
0f3da14a DW |
508 | dev_dax->id = -1; |
509 | return rc; | |
510 | } | |
511 | ||
512 | static int free_dev_dax_id(struct dev_dax *dev_dax) | |
513 | { | |
0f3da14a DW |
514 | int rc; |
515 | ||
c05ae9d8 VV |
516 | rc = down_write_killable(&dax_dev_rwsem); |
517 | if (rc) | |
518 | return rc; | |
0f3da14a | 519 | rc = __free_dev_dax_id(dev_dax); |
c05ae9d8 | 520 | up_write(&dax_dev_rwsem); |
0f3da14a DW |
521 | return rc; |
522 | } | |
523 | ||
70aab281 DW |
524 | static int alloc_dev_dax_id(struct dev_dax *dev_dax) |
525 | { | |
526 | struct dax_region *dax_region = dev_dax->region; | |
527 | int id; | |
528 | ||
529 | id = ida_alloc(&dax_region->ida, GFP_KERNEL); | |
530 | if (id < 0) | |
531 | return id; | |
532 | kref_get(&dax_region->kref); | |
533 | dev_dax->dyn_id = true; | |
534 | dev_dax->id = id; | |
535 | return id; | |
536 | } | |
537 | ||
0f3da14a DW |
538 | static ssize_t delete_store(struct device *dev, struct device_attribute *attr, |
539 | const char *buf, size_t len) | |
540 | { | |
541 | struct dax_region *dax_region = dev_get_drvdata(dev); | |
542 | struct dev_dax *dev_dax; | |
543 | struct device *victim; | |
544 | bool do_del = false; | |
545 | int rc; | |
546 | ||
547 | if (is_static(dax_region)) | |
548 | return -EINVAL; | |
549 | ||
550 | victim = device_find_child_by_name(dax_region->dev, buf); | |
551 | if (!victim) | |
552 | return -ENXIO; | |
553 | ||
6f6544f2 VV |
554 | device_lock(dev); |
555 | device_lock(victim); | |
0f3da14a | 556 | dev_dax = to_dev_dax(victim); |
6f6544f2 | 557 | down_write(&dax_dev_rwsem); |
60e93dc0 | 558 | if (victim->driver || dev_dax_size(dev_dax)) |
0f3da14a DW |
559 | rc = -EBUSY; |
560 | else { | |
561 | /* | |
562 | * Invalidate the device so it does not become active | |
563 | * again, but always preserve device-id-0 so that | |
564 | * /sys/bus/dax/ is guaranteed to be populated while any | |
565 | * dax_region is registered. | |
566 | */ | |
567 | if (dev_dax->id > 0) { | |
568 | do_del = __free_dev_dax_id(dev_dax) >= 0; | |
569 | rc = len; | |
570 | if (dax_region->seed == victim) | |
571 | dax_region->seed = NULL; | |
572 | if (dax_region->youngest == victim) | |
573 | dax_region->youngest = NULL; | |
574 | } else | |
575 | rc = -EBUSY; | |
576 | } | |
c05ae9d8 | 577 | up_write(&dax_dev_rwsem); |
6f6544f2 | 578 | device_unlock(victim); |
0f3da14a DW |
579 | |
580 | /* won the race to invalidate the device, clean it up */ | |
581 | if (do_del) | |
582 | devm_release_action(dev, unregister_dev_dax, victim); | |
6f6544f2 | 583 | device_unlock(dev); |
0f3da14a DW |
584 | put_device(victim); |
585 | ||
586 | return rc; | |
587 | } | |
588 | static DEVICE_ATTR_WO(delete); | |
589 | ||
c2f3011e DW |
590 | static umode_t dax_region_visible(struct kobject *kobj, struct attribute *a, |
591 | int n) | |
592 | { | |
593 | struct device *dev = container_of(kobj, struct device, kobj); | |
594 | struct dax_region *dax_region = dev_get_drvdata(dev); | |
595 | ||
0f3da14a DW |
596 | if (is_static(dax_region)) |
597 | if (a == &dev_attr_available_size.attr | |
598 | || a == &dev_attr_create.attr | |
599 | || a == &dev_attr_seed.attr | |
600 | || a == &dev_attr_delete.attr) | |
601 | return 0; | |
c2f3011e DW |
602 | return a->mode; |
603 | } | |
604 | ||
51cf784c | 605 | static struct attribute *dax_region_attributes[] = { |
c2f3011e | 606 | &dev_attr_available_size.attr, |
51cf784c | 607 | &dev_attr_region_size.attr, |
6d82120f | 608 | &dev_attr_region_align.attr, |
0f3da14a DW |
609 | &dev_attr_create.attr, |
610 | &dev_attr_seed.attr, | |
611 | &dev_attr_delete.attr, | |
51cf784c DW |
612 | &dev_attr_id.attr, |
613 | NULL, | |
614 | }; | |
615 | ||
616 | static const struct attribute_group dax_region_attribute_group = { | |
617 | .name = "dax_region", | |
618 | .attrs = dax_region_attributes, | |
c2f3011e | 619 | .is_visible = dax_region_visible, |
51cf784c DW |
620 | }; |
621 | ||
622 | static const struct attribute_group *dax_region_attribute_groups[] = { | |
623 | &dax_region_attribute_group, | |
624 | NULL, | |
625 | }; | |
626 | ||
51cf784c DW |
627 | static void dax_region_unregister(void *region) |
628 | { | |
629 | struct dax_region *dax_region = region; | |
630 | ||
631 | sysfs_remove_groups(&dax_region->dev->kobj, | |
632 | dax_region_attribute_groups); | |
633 | dax_region_put(dax_region); | |
634 | } | |
635 | ||
636 | struct dax_region *alloc_dax_region(struct device *parent, int region_id, | |
a4574f63 | 637 | struct range *range, int target_node, unsigned int align, |
c2f3011e | 638 | unsigned long flags) |
51cf784c DW |
639 | { |
640 | struct dax_region *dax_region; | |
641 | ||
642 | /* | |
643 | * The DAX core assumes that it can store its private data in | |
644 | * parent->driver_data. This WARN is a reminder / safeguard for | |
645 | * developers of device-dax drivers. | |
646 | */ | |
647 | if (dev_get_drvdata(parent)) { | |
648 | dev_WARN(parent, "dax core failed to setup private data\n"); | |
649 | return NULL; | |
650 | } | |
651 | ||
a4574f63 DW |
652 | if (!IS_ALIGNED(range->start, align) |
653 | || !IS_ALIGNED(range_len(range), align)) | |
51cf784c DW |
654 | return NULL; |
655 | ||
656 | dax_region = kzalloc(sizeof(*dax_region), GFP_KERNEL); | |
657 | if (!dax_region) | |
658 | return NULL; | |
659 | ||
660 | dev_set_drvdata(parent, dax_region); | |
51cf784c DW |
661 | kref_init(&dax_region->kref); |
662 | dax_region->id = region_id; | |
663 | dax_region->align = align; | |
664 | dax_region->dev = parent; | |
8fc5c735 | 665 | dax_region->target_node = target_node; |
0f3da14a | 666 | ida_init(&dax_region->ida); |
c2f3011e | 667 | dax_region->res = (struct resource) { |
a4574f63 DW |
668 | .start = range->start, |
669 | .end = range->end, | |
c2f3011e DW |
670 | .flags = IORESOURCE_MEM | flags, |
671 | }; | |
672 | ||
51cf784c DW |
673 | if (sysfs_create_groups(&parent->kobj, dax_region_attribute_groups)) { |
674 | kfree(dax_region); | |
675 | return NULL; | |
676 | } | |
677 | ||
51cf784c DW |
678 | if (devm_add_action_or_reset(parent, dax_region_unregister, dax_region)) |
679 | return NULL; | |
680 | return dax_region; | |
681 | } | |
682 | EXPORT_SYMBOL_GPL(alloc_dax_region); | |
683 | ||
0b07ce87 DW |
684 | static void dax_mapping_release(struct device *dev) |
685 | { | |
686 | struct dax_mapping *mapping = to_dax_mapping(dev); | |
6d24b170 DW |
687 | struct device *parent = dev->parent; |
688 | struct dev_dax *dev_dax = to_dev_dax(parent); | |
0b07ce87 DW |
689 | |
690 | ida_free(&dev_dax->ida, mapping->id); | |
691 | kfree(mapping); | |
6d24b170 | 692 | put_device(parent); |
0b07ce87 DW |
693 | } |
694 | ||
6f6544f2 | 695 | static void unregister_dax_mapping(void *data) |
0b07ce87 DW |
696 | { |
697 | struct device *dev = data; | |
698 | struct dax_mapping *mapping = to_dax_mapping(dev); | |
699 | struct dev_dax *dev_dax = to_dev_dax(dev->parent); | |
0b07ce87 DW |
700 | |
701 | dev_dbg(dev, "%s\n", __func__); | |
702 | ||
0b07ce87 DW |
703 | dev_dax->ranges[mapping->range_id].mapping = NULL; |
704 | mapping->range_id = -1; | |
705 | ||
82b4ceec | 706 | device_unregister(dev); |
0b07ce87 DW |
707 | } |
708 | ||
709 | static struct dev_dax_range *get_dax_range(struct device *dev) | |
710 | { | |
711 | struct dax_mapping *mapping = to_dax_mapping(dev); | |
712 | struct dev_dax *dev_dax = to_dev_dax(dev->parent); | |
c05ae9d8 | 713 | int rc; |
0b07ce87 | 714 | |
c05ae9d8 VV |
715 | rc = down_write_killable(&dax_region_rwsem); |
716 | if (rc) | |
717 | return NULL; | |
0b07ce87 | 718 | if (mapping->range_id < 0) { |
c05ae9d8 | 719 | up_write(&dax_region_rwsem); |
0b07ce87 DW |
720 | return NULL; |
721 | } | |
722 | ||
723 | return &dev_dax->ranges[mapping->range_id]; | |
724 | } | |
725 | ||
c05ae9d8 | 726 | static void put_dax_range(void) |
0b07ce87 | 727 | { |
c05ae9d8 | 728 | up_write(&dax_region_rwsem); |
0b07ce87 DW |
729 | } |
730 | ||
731 | static ssize_t start_show(struct device *dev, | |
732 | struct device_attribute *attr, char *buf) | |
733 | { | |
734 | struct dev_dax_range *dax_range; | |
735 | ssize_t rc; | |
736 | ||
737 | dax_range = get_dax_range(dev); | |
738 | if (!dax_range) | |
739 | return -ENXIO; | |
6ebed000 | 740 | rc = sysfs_emit(buf, "%#llx\n", dax_range->range.start); |
c05ae9d8 | 741 | put_dax_range(); |
0b07ce87 DW |
742 | |
743 | return rc; | |
744 | } | |
745 | static DEVICE_ATTR(start, 0400, start_show, NULL); | |
746 | ||
747 | static ssize_t end_show(struct device *dev, | |
748 | struct device_attribute *attr, char *buf) | |
749 | { | |
750 | struct dev_dax_range *dax_range; | |
751 | ssize_t rc; | |
752 | ||
753 | dax_range = get_dax_range(dev); | |
754 | if (!dax_range) | |
755 | return -ENXIO; | |
6ebed000 | 756 | rc = sysfs_emit(buf, "%#llx\n", dax_range->range.end); |
c05ae9d8 | 757 | put_dax_range(); |
0b07ce87 DW |
758 | |
759 | return rc; | |
760 | } | |
761 | static DEVICE_ATTR(end, 0400, end_show, NULL); | |
762 | ||
763 | static ssize_t pgoff_show(struct device *dev, | |
764 | struct device_attribute *attr, char *buf) | |
765 | { | |
766 | struct dev_dax_range *dax_range; | |
767 | ssize_t rc; | |
768 | ||
769 | dax_range = get_dax_range(dev); | |
770 | if (!dax_range) | |
771 | return -ENXIO; | |
6ebed000 | 772 | rc = sysfs_emit(buf, "%#lx\n", dax_range->pgoff); |
c05ae9d8 | 773 | put_dax_range(); |
0b07ce87 DW |
774 | |
775 | return rc; | |
776 | } | |
777 | static DEVICE_ATTR(page_offset, 0400, pgoff_show, NULL); | |
778 | ||
779 | static struct attribute *dax_mapping_attributes[] = { | |
780 | &dev_attr_start.attr, | |
781 | &dev_attr_end.attr, | |
782 | &dev_attr_page_offset.attr, | |
783 | NULL, | |
784 | }; | |
785 | ||
786 | static const struct attribute_group dax_mapping_attribute_group = { | |
787 | .attrs = dax_mapping_attributes, | |
788 | }; | |
789 | ||
790 | static const struct attribute_group *dax_mapping_attribute_groups[] = { | |
791 | &dax_mapping_attribute_group, | |
792 | NULL, | |
793 | }; | |
794 | ||
2c720b49 | 795 | static const struct device_type dax_mapping_type = { |
0b07ce87 DW |
796 | .release = dax_mapping_release, |
797 | .groups = dax_mapping_attribute_groups, | |
798 | }; | |
799 | ||
800 | static int devm_register_dax_mapping(struct dev_dax *dev_dax, int range_id) | |
801 | { | |
802 | struct dax_region *dax_region = dev_dax->region; | |
803 | struct dax_mapping *mapping; | |
804 | struct device *dev; | |
805 | int rc; | |
806 | ||
c14c647b | 807 | lockdep_assert_held_write(&dax_region_rwsem); |
0b07ce87 DW |
808 | |
809 | if (dev_WARN_ONCE(&dev_dax->dev, !dax_region->dev->driver, | |
810 | "region disabled\n")) | |
811 | return -ENXIO; | |
812 | ||
813 | mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); | |
814 | if (!mapping) | |
815 | return -ENOMEM; | |
816 | mapping->range_id = range_id; | |
817 | mapping->id = ida_alloc(&dev_dax->ida, GFP_KERNEL); | |
818 | if (mapping->id < 0) { | |
819 | kfree(mapping); | |
820 | return -ENOMEM; | |
821 | } | |
822 | dev_dax->ranges[range_id].mapping = mapping; | |
823 | dev = &mapping->dev; | |
824 | device_initialize(dev); | |
825 | dev->parent = &dev_dax->dev; | |
6d24b170 | 826 | get_device(dev->parent); |
0b07ce87 DW |
827 | dev->type = &dax_mapping_type; |
828 | dev_set_name(dev, "mapping%d", mapping->id); | |
829 | rc = device_add(dev); | |
830 | if (rc) { | |
831 | put_device(dev); | |
832 | return rc; | |
833 | } | |
834 | ||
835 | rc = devm_add_action_or_reset(dax_region->dev, unregister_dax_mapping, | |
836 | dev); | |
837 | if (rc) | |
838 | return rc; | |
839 | return 0; | |
840 | } | |
841 | ||
fcffb6a1 DW |
842 | static int alloc_dev_dax_range(struct dev_dax *dev_dax, u64 start, |
843 | resource_size_t size) | |
c2f3011e DW |
844 | { |
845 | struct dax_region *dax_region = dev_dax->region; | |
846 | struct resource *res = &dax_region->res; | |
847 | struct device *dev = &dev_dax->dev; | |
60e93dc0 DW |
848 | struct dev_dax_range *ranges; |
849 | unsigned long pgoff = 0; | |
c2f3011e | 850 | struct resource *alloc; |
0b07ce87 | 851 | int i, rc; |
c2f3011e | 852 | |
c14c647b | 853 | lockdep_assert_held_write(&dax_region_rwsem); |
c2f3011e | 854 | |
0f3da14a DW |
855 | /* handle the seed alloc special case */ |
856 | if (!size) { | |
60e93dc0 DW |
857 | if (dev_WARN_ONCE(dev, dev_dax->nr_range, |
858 | "0-size allocation must be first\n")) | |
859 | return -EBUSY; | |
860 | /* nr_range == 0 is elsewhere special cased as 0-size device */ | |
0f3da14a DW |
861 | return 0; |
862 | } | |
863 | ||
ff8da37d ZL |
864 | alloc = __request_region(res, start, size, dev_name(dev), 0); |
865 | if (!alloc) | |
60e93dc0 DW |
866 | return -ENOMEM; |
867 | ||
ff8da37d ZL |
868 | ranges = krealloc(dev_dax->ranges, sizeof(*ranges) |
869 | * (dev_dax->nr_range + 1), GFP_KERNEL); | |
870 | if (!ranges) { | |
871 | __release_region(res, alloc->start, resource_size(alloc)); | |
c2f3011e | 872 | return -ENOMEM; |
60e93dc0 | 873 | } |
c2f3011e | 874 | |
60e93dc0 DW |
875 | for (i = 0; i < dev_dax->nr_range; i++) |
876 | pgoff += PHYS_PFN(range_len(&ranges[i].range)); | |
877 | dev_dax->ranges = ranges; | |
878 | ranges[dev_dax->nr_range++] = (struct dev_dax_range) { | |
879 | .pgoff = pgoff, | |
880 | .range = { | |
881 | .start = alloc->start, | |
882 | .end = alloc->end, | |
883 | }, | |
c2f3011e DW |
884 | }; |
885 | ||
60e93dc0 DW |
886 | dev_dbg(dev, "alloc range[%d]: %pa:%pa\n", dev_dax->nr_range - 1, |
887 | &alloc->start, &alloc->end); | |
0b07ce87 DW |
888 | /* |
889 | * A dev_dax instance must be registered before mapping device | |
890 | * children can be added. Defer to devm_create_dev_dax() to add | |
891 | * the initial mapping device. | |
892 | */ | |
893 | if (!device_is_registered(&dev_dax->dev)) | |
894 | return 0; | |
895 | ||
896 | rc = devm_register_dax_mapping(dev_dax, dev_dax->nr_range - 1); | |
6268d7da DW |
897 | if (rc) |
898 | trim_dev_dax_range(dev_dax); | |
60e93dc0 | 899 | |
6268d7da | 900 | return rc; |
c2f3011e DW |
901 | } |
902 | ||
fcffb6a1 DW |
903 | static int adjust_dev_dax_range(struct dev_dax *dev_dax, struct resource *res, resource_size_t size) |
904 | { | |
60e93dc0 DW |
905 | int last_range = dev_dax->nr_range - 1; |
906 | struct dev_dax_range *dax_range = &dev_dax->ranges[last_range]; | |
60e93dc0 DW |
907 | bool is_shrink = resource_size(res) > size; |
908 | struct range *range = &dax_range->range; | |
909 | struct device *dev = &dev_dax->dev; | |
910 | int rc; | |
fcffb6a1 | 911 | |
c14c647b | 912 | lockdep_assert_held_write(&dax_region_rwsem); |
fcffb6a1 | 913 | |
60e93dc0 DW |
914 | if (dev_WARN_ONCE(dev, !size, "deletion is handled by dev_dax_shrink\n")) |
915 | return -EINVAL; | |
916 | ||
917 | rc = adjust_resource(res, range->start, size); | |
fcffb6a1 DW |
918 | if (rc) |
919 | return rc; | |
920 | ||
60e93dc0 | 921 | *range = (struct range) { |
fcffb6a1 DW |
922 | .start = range->start, |
923 | .end = range->start + size - 1, | |
924 | }; | |
925 | ||
60e93dc0 DW |
926 | dev_dbg(dev, "%s range[%d]: %#llx:%#llx\n", is_shrink ? "shrink" : "extend", |
927 | last_range, (unsigned long long) range->start, | |
928 | (unsigned long long) range->end); | |
929 | ||
fcffb6a1 DW |
930 | return 0; |
931 | } | |
932 | ||
51cf784c DW |
933 | static ssize_t size_show(struct device *dev, |
934 | struct device_attribute *attr, char *buf) | |
935 | { | |
936 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
60e93dc0 | 937 | unsigned long long size; |
c05ae9d8 | 938 | int rc; |
60e93dc0 | 939 | |
2acf0453 | 940 | rc = down_read_interruptible(&dax_dev_rwsem); |
c05ae9d8 VV |
941 | if (rc) |
942 | return rc; | |
60e93dc0 | 943 | size = dev_dax_size(dev_dax); |
2acf0453 | 944 | up_read(&dax_dev_rwsem); |
51cf784c | 945 | |
6ebed000 | 946 | return sysfs_emit(buf, "%llu\n", size); |
51cf784c | 947 | } |
fcffb6a1 | 948 | |
6d82120f | 949 | static bool alloc_is_aligned(struct dev_dax *dev_dax, resource_size_t size) |
fcffb6a1 DW |
950 | { |
951 | /* | |
952 | * The minimum mapping granularity for a device instance is a | |
953 | * single subsection, unless the arch says otherwise. | |
954 | */ | |
6d82120f | 955 | return IS_ALIGNED(size, max_t(unsigned long, dev_dax->align, memremap_compat_align())); |
fcffb6a1 DW |
956 | } |
957 | ||
958 | static int dev_dax_shrink(struct dev_dax *dev_dax, resource_size_t size) | |
959 | { | |
60e93dc0 | 960 | resource_size_t to_shrink = dev_dax_size(dev_dax) - size; |
fcffb6a1 | 961 | struct dax_region *dax_region = dev_dax->region; |
fcffb6a1 | 962 | struct device *dev = &dev_dax->dev; |
60e93dc0 DW |
963 | int i; |
964 | ||
965 | for (i = dev_dax->nr_range - 1; i >= 0; i--) { | |
966 | struct range *range = &dev_dax->ranges[i].range; | |
0b07ce87 | 967 | struct dax_mapping *mapping = dev_dax->ranges[i].mapping; |
60e93dc0 DW |
968 | struct resource *adjust = NULL, *res; |
969 | resource_size_t shrink; | |
970 | ||
971 | shrink = min_t(u64, to_shrink, range_len(range)); | |
972 | if (shrink >= range_len(range)) { | |
0b07ce87 DW |
973 | devm_release_action(dax_region->dev, |
974 | unregister_dax_mapping, &mapping->dev); | |
6268d7da | 975 | trim_dev_dax_range(dev_dax); |
60e93dc0 DW |
976 | to_shrink -= shrink; |
977 | if (!to_shrink) | |
978 | break; | |
979 | continue; | |
fcffb6a1 DW |
980 | } |
981 | ||
60e93dc0 DW |
982 | for_each_dax_region_resource(dax_region, res) |
983 | if (strcmp(res->name, dev_name(dev)) == 0 | |
984 | && res->start == range->start) { | |
985 | adjust = res; | |
986 | break; | |
987 | } | |
988 | ||
989 | if (dev_WARN_ONCE(dev, !adjust || i != dev_dax->nr_range - 1, | |
990 | "failed to find matching resource\n")) | |
991 | return -ENXIO; | |
992 | return adjust_dev_dax_range(dev_dax, adjust, range_len(range) | |
993 | - shrink); | |
994 | } | |
995 | return 0; | |
996 | } | |
997 | ||
998 | /* | |
999 | * Only allow adjustments that preserve the relative pgoff of existing | |
1000 | * allocations. I.e. the dev_dax->ranges array is ordered by increasing pgoff. | |
1001 | */ | |
1002 | static bool adjust_ok(struct dev_dax *dev_dax, struct resource *res) | |
1003 | { | |
1004 | struct dev_dax_range *last; | |
1005 | int i; | |
1006 | ||
1007 | if (dev_dax->nr_range == 0) | |
1008 | return false; | |
1009 | if (strcmp(res->name, dev_name(&dev_dax->dev)) != 0) | |
1010 | return false; | |
1011 | last = &dev_dax->ranges[dev_dax->nr_range - 1]; | |
1012 | if (last->range.start != res->start || last->range.end != res->end) | |
1013 | return false; | |
1014 | for (i = 0; i < dev_dax->nr_range - 1; i++) { | |
1015 | struct dev_dax_range *dax_range = &dev_dax->ranges[i]; | |
1016 | ||
1017 | if (dax_range->pgoff > last->pgoff) | |
1018 | return false; | |
1019 | } | |
1020 | ||
1021 | return true; | |
fcffb6a1 DW |
1022 | } |
1023 | ||
1024 | static ssize_t dev_dax_resize(struct dax_region *dax_region, | |
1025 | struct dev_dax *dev_dax, resource_size_t size) | |
1026 | { | |
1027 | resource_size_t avail = dax_region_avail_size(dax_region), to_alloc; | |
60e93dc0 | 1028 | resource_size_t dev_size = dev_dax_size(dev_dax); |
fcffb6a1 DW |
1029 | struct resource *region_res = &dax_region->res; |
1030 | struct device *dev = &dev_dax->dev; | |
fcffb6a1 | 1031 | struct resource *res, *first; |
60e93dc0 DW |
1032 | resource_size_t alloc = 0; |
1033 | int rc; | |
fcffb6a1 DW |
1034 | |
1035 | if (dev->driver) | |
1036 | return -EBUSY; | |
1037 | if (size == dev_size) | |
1038 | return 0; | |
1039 | if (size > dev_size && size - dev_size > avail) | |
1040 | return -ENOSPC; | |
1041 | if (size < dev_size) | |
1042 | return dev_dax_shrink(dev_dax, size); | |
1043 | ||
1044 | to_alloc = size - dev_size; | |
6d82120f | 1045 | if (dev_WARN_ONCE(dev, !alloc_is_aligned(dev_dax, to_alloc), |
fcffb6a1 DW |
1046 | "resize of %pa misaligned\n", &to_alloc)) |
1047 | return -ENXIO; | |
1048 | ||
1049 | /* | |
1050 | * Expand the device into the unused portion of the region. This | |
1051 | * may involve adjusting the end of an existing resource, or | |
1052 | * allocating a new resource. | |
1053 | */ | |
60e93dc0 | 1054 | retry: |
fcffb6a1 DW |
1055 | first = region_res->child; |
1056 | if (!first) | |
1057 | return alloc_dev_dax_range(dev_dax, dax_region->res.start, to_alloc); | |
60e93dc0 DW |
1058 | |
1059 | rc = -ENOSPC; | |
1060 | for (res = first; res; res = res->sibling) { | |
fcffb6a1 | 1061 | struct resource *next = res->sibling; |
fcffb6a1 DW |
1062 | |
1063 | /* space at the beginning of the region */ | |
60e93dc0 DW |
1064 | if (res == first && res->start > dax_region->res.start) { |
1065 | alloc = min(res->start - dax_region->res.start, to_alloc); | |
1066 | rc = alloc_dev_dax_range(dev_dax, dax_region->res.start, alloc); | |
1067 | break; | |
1068 | } | |
fcffb6a1 | 1069 | |
60e93dc0 | 1070 | alloc = 0; |
fcffb6a1 DW |
1071 | /* space between allocations */ |
1072 | if (next && next->start > res->end + 1) | |
60e93dc0 | 1073 | alloc = min(next->start - (res->end + 1), to_alloc); |
fcffb6a1 DW |
1074 | |
1075 | /* space at the end of the region */ | |
60e93dc0 DW |
1076 | if (!alloc && !next && res->end < region_res->end) |
1077 | alloc = min(region_res->end - res->end, to_alloc); | |
fcffb6a1 | 1078 | |
60e93dc0 DW |
1079 | if (!alloc) |
1080 | continue; | |
1081 | ||
1082 | if (adjust_ok(dev_dax, res)) { | |
1083 | rc = adjust_dev_dax_range(dev_dax, res, resource_size(res) + alloc); | |
1084 | break; | |
1085 | } | |
1086 | rc = alloc_dev_dax_range(dev_dax, res->end + 1, alloc); | |
1087 | break; | |
fcffb6a1 | 1088 | } |
60e93dc0 DW |
1089 | if (rc) |
1090 | return rc; | |
1091 | to_alloc -= alloc; | |
1092 | if (to_alloc) | |
1093 | goto retry; | |
1094 | return 0; | |
fcffb6a1 DW |
1095 | } |
1096 | ||
1097 | static ssize_t size_store(struct device *dev, struct device_attribute *attr, | |
1098 | const char *buf, size_t len) | |
1099 | { | |
1100 | ssize_t rc; | |
1101 | unsigned long long val; | |
1102 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
1103 | struct dax_region *dax_region = dev_dax->region; | |
1104 | ||
1105 | rc = kstrtoull(buf, 0, &val); | |
1106 | if (rc) | |
1107 | return rc; | |
1108 | ||
6d82120f | 1109 | if (!alloc_is_aligned(dev_dax, val)) { |
fcffb6a1 DW |
1110 | dev_dbg(dev, "%s: size: %lld misaligned\n", __func__, val); |
1111 | return -EINVAL; | |
1112 | } | |
1113 | ||
c05ae9d8 VV |
1114 | rc = down_write_killable(&dax_region_rwsem); |
1115 | if (rc) | |
1116 | return rc; | |
fcffb6a1 | 1117 | if (!dax_region->dev->driver) { |
c05ae9d8 VV |
1118 | rc = -ENXIO; |
1119 | goto err_region; | |
fcffb6a1 | 1120 | } |
c05ae9d8 VV |
1121 | rc = down_write_killable(&dax_dev_rwsem); |
1122 | if (rc) | |
1123 | goto err_dev; | |
1124 | ||
fcffb6a1 | 1125 | rc = dev_dax_resize(dax_region, dev_dax, val); |
fcffb6a1 | 1126 | |
c05ae9d8 VV |
1127 | err_dev: |
1128 | up_write(&dax_dev_rwsem); | |
1129 | err_region: | |
1130 | up_write(&dax_region_rwsem); | |
1131 | ||
1132 | if (rc == 0) | |
1133 | return len; | |
1134 | return rc; | |
fcffb6a1 DW |
1135 | } |
1136 | static DEVICE_ATTR_RW(size); | |
51cf784c | 1137 | |
8490e2e2 JM |
1138 | static ssize_t range_parse(const char *opt, size_t len, struct range *range) |
1139 | { | |
1140 | unsigned long long addr = 0; | |
1141 | char *start, *end, *str; | |
7323fb22 | 1142 | ssize_t rc = -EINVAL; |
8490e2e2 JM |
1143 | |
1144 | str = kstrdup(opt, GFP_KERNEL); | |
1145 | if (!str) | |
1146 | return rc; | |
1147 | ||
1148 | end = str; | |
1149 | start = strsep(&end, "-"); | |
1150 | if (!start || !end) | |
1151 | goto err; | |
1152 | ||
1153 | rc = kstrtoull(start, 16, &addr); | |
1154 | if (rc) | |
1155 | goto err; | |
1156 | range->start = addr; | |
1157 | ||
1158 | rc = kstrtoull(end, 16, &addr); | |
1159 | if (rc) | |
1160 | goto err; | |
1161 | range->end = addr; | |
1162 | ||
1163 | err: | |
1164 | kfree(str); | |
1165 | return rc; | |
1166 | } | |
1167 | ||
1168 | static ssize_t mapping_store(struct device *dev, struct device_attribute *attr, | |
1169 | const char *buf, size_t len) | |
1170 | { | |
1171 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
1172 | struct dax_region *dax_region = dev_dax->region; | |
1173 | size_t to_alloc; | |
1174 | struct range r; | |
1175 | ssize_t rc; | |
1176 | ||
1177 | rc = range_parse(buf, len, &r); | |
1178 | if (rc) | |
1179 | return rc; | |
1180 | ||
c05ae9d8 VV |
1181 | rc = down_write_killable(&dax_region_rwsem); |
1182 | if (rc) | |
1183 | return rc; | |
8490e2e2 | 1184 | if (!dax_region->dev->driver) { |
c05ae9d8 VV |
1185 | up_write(&dax_region_rwsem); |
1186 | return rc; | |
1187 | } | |
1188 | rc = down_write_killable(&dax_dev_rwsem); | |
1189 | if (rc) { | |
1190 | up_write(&dax_region_rwsem); | |
8490e2e2 JM |
1191 | return rc; |
1192 | } | |
8490e2e2 JM |
1193 | |
1194 | to_alloc = range_len(&r); | |
1195 | if (alloc_is_aligned(dev_dax, to_alloc)) | |
1196 | rc = alloc_dev_dax_range(dev_dax, r.start, to_alloc); | |
c05ae9d8 VV |
1197 | up_write(&dax_dev_rwsem); |
1198 | up_write(&dax_region_rwsem); | |
8490e2e2 JM |
1199 | |
1200 | return rc == 0 ? len : rc; | |
1201 | } | |
1202 | static DEVICE_ATTR_WO(mapping); | |
1203 | ||
6d82120f DW |
1204 | static ssize_t align_show(struct device *dev, |
1205 | struct device_attribute *attr, char *buf) | |
1206 | { | |
1207 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
1208 | ||
6ebed000 | 1209 | return sysfs_emit(buf, "%d\n", dev_dax->align); |
6d82120f DW |
1210 | } |
1211 | ||
1212 | static ssize_t dev_dax_validate_align(struct dev_dax *dev_dax) | |
1213 | { | |
6d82120f DW |
1214 | struct device *dev = &dev_dax->dev; |
1215 | int i; | |
1216 | ||
6d82120f DW |
1217 | for (i = 0; i < dev_dax->nr_range; i++) { |
1218 | size_t len = range_len(&dev_dax->ranges[i].range); | |
1219 | ||
1220 | if (!alloc_is_aligned(dev_dax, len)) { | |
1221 | dev_dbg(dev, "%s: align %u invalid for range %d\n", | |
1222 | __func__, dev_dax->align, i); | |
1223 | return -EINVAL; | |
1224 | } | |
1225 | } | |
1226 | ||
1227 | return 0; | |
1228 | } | |
1229 | ||
1230 | static ssize_t align_store(struct device *dev, struct device_attribute *attr, | |
1231 | const char *buf, size_t len) | |
1232 | { | |
1233 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
1234 | struct dax_region *dax_region = dev_dax->region; | |
1235 | unsigned long val, align_save; | |
1236 | ssize_t rc; | |
1237 | ||
1238 | rc = kstrtoul(buf, 0, &val); | |
1239 | if (rc) | |
1240 | return -ENXIO; | |
1241 | ||
1242 | if (!dax_align_valid(val)) | |
1243 | return -EINVAL; | |
1244 | ||
c05ae9d8 VV |
1245 | rc = down_write_killable(&dax_region_rwsem); |
1246 | if (rc) | |
1247 | return rc; | |
6d82120f | 1248 | if (!dax_region->dev->driver) { |
c05ae9d8 | 1249 | up_write(&dax_region_rwsem); |
6d82120f DW |
1250 | return -ENXIO; |
1251 | } | |
1252 | ||
c05ae9d8 VV |
1253 | rc = down_write_killable(&dax_dev_rwsem); |
1254 | if (rc) { | |
1255 | up_write(&dax_region_rwsem); | |
1256 | return rc; | |
1257 | } | |
6d82120f DW |
1258 | if (dev->driver) { |
1259 | rc = -EBUSY; | |
1260 | goto out_unlock; | |
1261 | } | |
1262 | ||
1263 | align_save = dev_dax->align; | |
1264 | dev_dax->align = val; | |
1265 | rc = dev_dax_validate_align(dev_dax); | |
1266 | if (rc) | |
1267 | dev_dax->align = align_save; | |
1268 | out_unlock: | |
c05ae9d8 VV |
1269 | up_write(&dax_dev_rwsem); |
1270 | up_write(&dax_region_rwsem); | |
6d82120f DW |
1271 | return rc == 0 ? len : rc; |
1272 | } | |
1273 | static DEVICE_ATTR_RW(align); | |
1274 | ||
21c75763 DW |
1275 | static int dev_dax_target_node(struct dev_dax *dev_dax) |
1276 | { | |
1277 | struct dax_region *dax_region = dev_dax->region; | |
1278 | ||
1279 | return dax_region->target_node; | |
1280 | } | |
1281 | ||
1282 | static ssize_t target_node_show(struct device *dev, | |
1283 | struct device_attribute *attr, char *buf) | |
1284 | { | |
1285 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
1286 | ||
6ebed000 | 1287 | return sysfs_emit(buf, "%d\n", dev_dax_target_node(dev_dax)); |
21c75763 DW |
1288 | } |
1289 | static DEVICE_ATTR_RO(target_node); | |
1290 | ||
40cdc60a VV |
1291 | static ssize_t resource_show(struct device *dev, |
1292 | struct device_attribute *attr, char *buf) | |
1293 | { | |
1294 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
60e93dc0 DW |
1295 | struct dax_region *dax_region = dev_dax->region; |
1296 | unsigned long long start; | |
1297 | ||
1298 | if (dev_dax->nr_range < 1) | |
1299 | start = dax_region->res.start; | |
1300 | else | |
1301 | start = dev_dax->ranges[0].range.start; | |
40cdc60a | 1302 | |
6ebed000 | 1303 | return sysfs_emit(buf, "%#llx\n", start); |
40cdc60a | 1304 | } |
153dd286 | 1305 | static DEVICE_ATTR(resource, 0400, resource_show, NULL); |
40cdc60a | 1306 | |
c347bd71 VV |
1307 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, |
1308 | char *buf) | |
1309 | { | |
1310 | /* | |
1311 | * We only ever expect to handle device-dax instances, i.e. the | |
1312 | * @type argument to MODULE_ALIAS_DAX_DEVICE() is always zero | |
1313 | */ | |
6ebed000 | 1314 | return sysfs_emit(buf, DAX_DEVICE_MODALIAS_FMT "\n", 0); |
c347bd71 VV |
1315 | } |
1316 | static DEVICE_ATTR_RO(modalias); | |
1317 | ||
cb4dd729 DW |
1318 | static ssize_t numa_node_show(struct device *dev, |
1319 | struct device_attribute *attr, char *buf) | |
1320 | { | |
6ebed000 | 1321 | return sysfs_emit(buf, "%d\n", dev_to_node(dev)); |
cb4dd729 DW |
1322 | } |
1323 | static DEVICE_ATTR_RO(numa_node); | |
1324 | ||
73954d37 VV |
1325 | static ssize_t memmap_on_memory_show(struct device *dev, |
1326 | struct device_attribute *attr, char *buf) | |
1327 | { | |
1328 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
1329 | ||
1330 | return sysfs_emit(buf, "%d\n", dev_dax->memmap_on_memory); | |
1331 | } | |
1332 | ||
1333 | static ssize_t memmap_on_memory_store(struct device *dev, | |
1334 | struct device_attribute *attr, | |
1335 | const char *buf, size_t len) | |
1336 | { | |
1337 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
1338 | bool val; | |
1339 | int rc; | |
1340 | ||
1341 | rc = kstrtobool(buf, &val); | |
1342 | if (rc) | |
1343 | return rc; | |
1344 | ||
1345 | if (val == true && !mhp_supports_memmap_on_memory()) { | |
1346 | dev_dbg(dev, "memmap_on_memory is not available\n"); | |
1347 | return -EOPNOTSUPP; | |
1348 | } | |
1349 | ||
1350 | rc = down_write_killable(&dax_dev_rwsem); | |
1351 | if (rc) | |
1352 | return rc; | |
1353 | ||
1354 | if (dev_dax->memmap_on_memory != val && dev->driver && | |
1355 | to_dax_drv(dev->driver)->type == DAXDRV_KMEM_TYPE) { | |
1356 | up_write(&dax_dev_rwsem); | |
1357 | return -EBUSY; | |
1358 | } | |
1359 | ||
1360 | dev_dax->memmap_on_memory = val; | |
1361 | up_write(&dax_dev_rwsem); | |
1362 | ||
1363 | return len; | |
1364 | } | |
1365 | static DEVICE_ATTR_RW(memmap_on_memory); | |
1366 | ||
21c75763 DW |
1367 | static umode_t dev_dax_visible(struct kobject *kobj, struct attribute *a, int n) |
1368 | { | |
1369 | struct device *dev = container_of(kobj, struct device, kobj); | |
1370 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
fcffb6a1 | 1371 | struct dax_region *dax_region = dev_dax->region; |
21c75763 DW |
1372 | |
1373 | if (a == &dev_attr_target_node.attr && dev_dax_target_node(dev_dax) < 0) | |
1374 | return 0; | |
cb4dd729 DW |
1375 | if (a == &dev_attr_numa_node.attr && !IS_ENABLED(CONFIG_NUMA)) |
1376 | return 0; | |
8490e2e2 JM |
1377 | if (a == &dev_attr_mapping.attr && is_static(dax_region)) |
1378 | return 0; | |
6d82120f DW |
1379 | if ((a == &dev_attr_align.attr || |
1380 | a == &dev_attr_size.attr) && is_static(dax_region)) | |
fcffb6a1 | 1381 | return 0444; |
21c75763 DW |
1382 | return a->mode; |
1383 | } | |
1384 | ||
51cf784c | 1385 | static struct attribute *dev_dax_attributes[] = { |
c347bd71 | 1386 | &dev_attr_modalias.attr, |
51cf784c | 1387 | &dev_attr_size.attr, |
8490e2e2 | 1388 | &dev_attr_mapping.attr, |
21c75763 | 1389 | &dev_attr_target_node.attr, |
6d82120f | 1390 | &dev_attr_align.attr, |
40cdc60a | 1391 | &dev_attr_resource.attr, |
cb4dd729 | 1392 | &dev_attr_numa_node.attr, |
73954d37 | 1393 | &dev_attr_memmap_on_memory.attr, |
51cf784c DW |
1394 | NULL, |
1395 | }; | |
1396 | ||
1397 | static const struct attribute_group dev_dax_attribute_group = { | |
1398 | .attrs = dev_dax_attributes, | |
21c75763 | 1399 | .is_visible = dev_dax_visible, |
51cf784c DW |
1400 | }; |
1401 | ||
9567da0b | 1402 | static const struct attribute_group *dax_attribute_groups[] = { |
51cf784c DW |
1403 | &dev_dax_attribute_group, |
1404 | NULL, | |
1405 | }; | |
51cf784c | 1406 | |
9567da0b | 1407 | static void dev_dax_release(struct device *dev) |
51cf784c DW |
1408 | { |
1409 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
1410 | struct dax_device *dax_dev = dev_dax->dax_dev; | |
51cf784c | 1411 | |
9567da0b | 1412 | put_dax(dax_dev); |
0f3da14a | 1413 | free_dev_dax_id(dev_dax); |
f5516ec5 | 1414 | kfree(dev_dax->pgmap); |
9567da0b DW |
1415 | kfree(dev_dax); |
1416 | } | |
1417 | ||
770619a9 DW |
1418 | static const struct device_type dev_dax_type = { |
1419 | .release = dev_dax_release, | |
1420 | .groups = dax_attribute_groups, | |
1421 | }; | |
1422 | ||
c05ae9d8 | 1423 | static struct dev_dax *__devm_create_dev_dax(struct dev_dax_data *data) |
9567da0b | 1424 | { |
174ebece | 1425 | struct dax_region *dax_region = data->dax_region; |
9567da0b DW |
1426 | struct device *parent = dax_region->dev; |
1427 | struct dax_device *dax_dev; | |
1428 | struct dev_dax *dev_dax; | |
1429 | struct inode *inode; | |
1430 | struct device *dev; | |
c2f3011e | 1431 | int rc; |
9567da0b | 1432 | |
9567da0b DW |
1433 | dev_dax = kzalloc(sizeof(*dev_dax), GFP_KERNEL); |
1434 | if (!dev_dax) | |
1435 | return ERR_PTR(-ENOMEM); | |
1436 | ||
70aab281 | 1437 | dev_dax->region = dax_region; |
0f3da14a DW |
1438 | if (is_static(dax_region)) { |
1439 | if (dev_WARN_ONCE(parent, data->id < 0, | |
1440 | "dynamic id specified to static region\n")) { | |
1441 | rc = -EINVAL; | |
1442 | goto err_id; | |
1443 | } | |
1444 | ||
1445 | dev_dax->id = data->id; | |
1446 | } else { | |
1447 | if (dev_WARN_ONCE(parent, data->id >= 0, | |
1448 | "static id specified to dynamic region\n")) { | |
1449 | rc = -EINVAL; | |
1450 | goto err_id; | |
1451 | } | |
1452 | ||
70aab281 | 1453 | rc = alloc_dev_dax_id(dev_dax); |
0f3da14a DW |
1454 | if (rc < 0) |
1455 | goto err_id; | |
0f3da14a DW |
1456 | } |
1457 | ||
c2f3011e DW |
1458 | dev = &dev_dax->dev; |
1459 | device_initialize(dev); | |
0f3da14a | 1460 | dev_set_name(dev, "dax%d.%d", dax_region->id, dev_dax->id); |
c2f3011e | 1461 | |
fcffb6a1 | 1462 | rc = alloc_dev_dax_range(dev_dax, dax_region->res.start, data->size); |
c2f3011e DW |
1463 | if (rc) |
1464 | goto err_range; | |
1465 | ||
f5516ec5 | 1466 | if (data->pgmap) { |
c2f3011e DW |
1467 | dev_WARN_ONCE(parent, !is_static(dax_region), |
1468 | "custom dev_pagemap requires a static dax_region\n"); | |
1469 | ||
f5516ec5 DW |
1470 | dev_dax->pgmap = kmemdup(data->pgmap, |
1471 | sizeof(struct dev_pagemap), GFP_KERNEL); | |
c2f3011e DW |
1472 | if (!dev_dax->pgmap) { |
1473 | rc = -ENOMEM; | |
f5516ec5 | 1474 | goto err_pgmap; |
c2f3011e | 1475 | } |
f5516ec5 | 1476 | } |
89ec9f2c | 1477 | |
9567da0b | 1478 | /* |
fb08a190 CH |
1479 | * No dax_operations since there is no access to this device outside of |
1480 | * mmap of the resulting character device. | |
9567da0b | 1481 | */ |
30c6828a | 1482 | dax_dev = alloc_dax(dev_dax, NULL); |
4e4ced93 VG |
1483 | if (IS_ERR(dax_dev)) { |
1484 | rc = PTR_ERR(dax_dev); | |
f5516ec5 | 1485 | goto err_alloc_dax; |
4e4ced93 | 1486 | } |
30c6828a | 1487 | set_dax_synchronous(dax_dev); |
7ac5360c CH |
1488 | set_dax_nocache(dax_dev); |
1489 | set_dax_nomc(dax_dev); | |
9567da0b DW |
1490 | |
1491 | /* a device_dax instance is dead while the driver is not attached */ | |
1492 | kill_dax(dax_dev); | |
1493 | ||
9567da0b | 1494 | dev_dax->dax_dev = dax_dev; |
8fc5c735 | 1495 | dev_dax->target_node = dax_region->target_node; |
33cf94d7 | 1496 | dev_dax->align = dax_region->align; |
0b07ce87 | 1497 | ida_init(&dev_dax->ida); |
9567da0b | 1498 | |
4eca0ef4 VV |
1499 | dev_dax->memmap_on_memory = data->memmap_on_memory; |
1500 | ||
9567da0b DW |
1501 | inode = dax_inode(dax_dev); |
1502 | dev->devt = inode->i_rdev; | |
83762cb5 | 1503 | dev->bus = &dax_bus_type; |
9567da0b | 1504 | dev->parent = parent; |
770619a9 | 1505 | dev->type = &dev_dax_type; |
9567da0b DW |
1506 | |
1507 | rc = device_add(dev); | |
1508 | if (rc) { | |
1509 | kill_dev_dax(dev_dax); | |
1510 | put_device(dev); | |
1511 | return ERR_PTR(rc); | |
1512 | } | |
1513 | ||
1514 | rc = devm_add_action_or_reset(dax_region->dev, unregister_dev_dax, dev); | |
1515 | if (rc) | |
1516 | return ERR_PTR(rc); | |
1517 | ||
0b07ce87 DW |
1518 | /* register mapping device for the initial allocation range */ |
1519 | if (dev_dax->nr_range && range_len(&dev_dax->ranges[0].range)) { | |
1520 | rc = devm_register_dax_mapping(dev_dax, 0); | |
1521 | if (rc) | |
1522 | return ERR_PTR(rc); | |
1523 | } | |
1524 | ||
9567da0b | 1525 | return dev_dax; |
c2f3011e | 1526 | |
f5516ec5 DW |
1527 | err_alloc_dax: |
1528 | kfree(dev_dax->pgmap); | |
1529 | err_pgmap: | |
60e93dc0 | 1530 | free_dev_dax_ranges(dev_dax); |
c2f3011e | 1531 | err_range: |
0f3da14a DW |
1532 | free_dev_dax_id(dev_dax); |
1533 | err_id: | |
9567da0b DW |
1534 | kfree(dev_dax); |
1535 | ||
1536 | return ERR_PTR(rc); | |
1537 | } | |
c05ae9d8 VV |
1538 | |
1539 | struct dev_dax *devm_create_dev_dax(struct dev_dax_data *data) | |
1540 | { | |
1541 | struct dev_dax *dev_dax; | |
c05ae9d8 | 1542 | |
e39dbcfb | 1543 | down_write(&dax_region_rwsem); |
c05ae9d8 VV |
1544 | dev_dax = __devm_create_dev_dax(data); |
1545 | up_write(&dax_region_rwsem); | |
1546 | ||
1547 | return dev_dax; | |
1548 | } | |
174ebece | 1549 | EXPORT_SYMBOL_GPL(devm_create_dev_dax); |
9567da0b | 1550 | |
d200781e | 1551 | int __dax_driver_register(struct dax_device_driver *dax_drv, |
9567da0b DW |
1552 | struct module *module, const char *mod_name) |
1553 | { | |
d200781e | 1554 | struct device_driver *drv = &dax_drv->drv; |
d200781e | 1555 | |
5b8e64f1 UKK |
1556 | /* |
1557 | * dax_bus_probe() calls dax_drv->probe() unconditionally. | |
1558 | * So better be safe than sorry and ensure it is provided. | |
1559 | */ | |
1560 | if (!dax_drv->probe) | |
1561 | return -EINVAL; | |
1562 | ||
d200781e | 1563 | INIT_LIST_HEAD(&dax_drv->ids); |
9567da0b DW |
1564 | drv->owner = module; |
1565 | drv->name = mod_name; | |
1566 | drv->mod_name = mod_name; | |
1567 | drv->bus = &dax_bus_type; | |
d200781e | 1568 | |
e9ee9fe3 | 1569 | return driver_register(drv); |
9567da0b DW |
1570 | } |
1571 | EXPORT_SYMBOL_GPL(__dax_driver_register); | |
1572 | ||
d200781e DW |
1573 | void dax_driver_unregister(struct dax_device_driver *dax_drv) |
1574 | { | |
730926c3 | 1575 | struct device_driver *drv = &dax_drv->drv; |
d200781e DW |
1576 | struct dax_id *dax_id, *_id; |
1577 | ||
1578 | mutex_lock(&dax_bus_lock); | |
d200781e DW |
1579 | list_for_each_entry_safe(dax_id, _id, &dax_drv->ids, list) { |
1580 | list_del(&dax_id->list); | |
1581 | kfree(dax_id); | |
1582 | } | |
1583 | mutex_unlock(&dax_bus_lock); | |
730926c3 | 1584 | driver_unregister(drv); |
d200781e DW |
1585 | } |
1586 | EXPORT_SYMBOL_GPL(dax_driver_unregister); | |
1587 | ||
9567da0b DW |
1588 | int __init dax_bus_init(void) |
1589 | { | |
83762cb5 | 1590 | return bus_register(&dax_bus_type); |
9567da0b DW |
1591 | } |
1592 | ||
1593 | void __exit dax_bus_exit(void) | |
1594 | { | |
1595 | bus_unregister(&dax_bus_type); | |
1596 | } |