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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 | ||
c05ae9d8 | 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 | ||
474 | kill_dev_dax(dev_dax); | |
0f3da14a | 475 | device_del(dev); |
e686c325 | 476 | free_dev_dax_ranges(dev_dax); |
0f3da14a DW |
477 | put_device(dev); |
478 | } | |
479 | ||
c05ae9d8 VV |
480 | static void unregister_dev_dax(void *dev) |
481 | { | |
482 | if (rwsem_is_locked(&dax_region_rwsem)) | |
483 | return __unregister_dev_dax(dev); | |
484 | ||
485 | if (WARN_ON_ONCE(down_write_killable(&dax_region_rwsem) != 0)) | |
486 | return; | |
487 | __unregister_dev_dax(dev); | |
488 | up_write(&dax_region_rwsem); | |
489 | } | |
490 | ||
70aab281 DW |
491 | static void dax_region_free(struct kref *kref) |
492 | { | |
493 | struct dax_region *dax_region; | |
494 | ||
495 | dax_region = container_of(kref, struct dax_region, kref); | |
496 | kfree(dax_region); | |
497 | } | |
498 | ||
2532f416 | 499 | static void dax_region_put(struct dax_region *dax_region) |
70aab281 DW |
500 | { |
501 | kref_put(&dax_region->kref, dax_region_free); | |
502 | } | |
70aab281 | 503 | |
0f3da14a DW |
504 | /* a return value >= 0 indicates this invocation invalidated the id */ |
505 | static int __free_dev_dax_id(struct dev_dax *dev_dax) | |
506 | { | |
70aab281 | 507 | struct dax_region *dax_region; |
0f3da14a DW |
508 | int rc = dev_dax->id; |
509 | ||
c14c647b | 510 | lockdep_assert_held_write(&dax_dev_rwsem); |
0f3da14a | 511 | |
70aab281 | 512 | if (!dev_dax->dyn_id || dev_dax->id < 0) |
0f3da14a | 513 | return -1; |
70aab281 | 514 | dax_region = dev_dax->region; |
0f3da14a | 515 | ida_free(&dax_region->ida, dev_dax->id); |
70aab281 | 516 | dax_region_put(dax_region); |
0f3da14a DW |
517 | dev_dax->id = -1; |
518 | return rc; | |
519 | } | |
520 | ||
521 | static int free_dev_dax_id(struct dev_dax *dev_dax) | |
522 | { | |
0f3da14a DW |
523 | int rc; |
524 | ||
c05ae9d8 VV |
525 | rc = down_write_killable(&dax_dev_rwsem); |
526 | if (rc) | |
527 | return rc; | |
0f3da14a | 528 | rc = __free_dev_dax_id(dev_dax); |
c05ae9d8 | 529 | up_write(&dax_dev_rwsem); |
0f3da14a DW |
530 | return rc; |
531 | } | |
532 | ||
70aab281 DW |
533 | static int alloc_dev_dax_id(struct dev_dax *dev_dax) |
534 | { | |
535 | struct dax_region *dax_region = dev_dax->region; | |
536 | int id; | |
537 | ||
538 | id = ida_alloc(&dax_region->ida, GFP_KERNEL); | |
539 | if (id < 0) | |
540 | return id; | |
541 | kref_get(&dax_region->kref); | |
542 | dev_dax->dyn_id = true; | |
543 | dev_dax->id = id; | |
544 | return id; | |
545 | } | |
546 | ||
0f3da14a DW |
547 | static ssize_t delete_store(struct device *dev, struct device_attribute *attr, |
548 | const char *buf, size_t len) | |
549 | { | |
550 | struct dax_region *dax_region = dev_get_drvdata(dev); | |
551 | struct dev_dax *dev_dax; | |
552 | struct device *victim; | |
553 | bool do_del = false; | |
554 | int rc; | |
555 | ||
556 | if (is_static(dax_region)) | |
557 | return -EINVAL; | |
558 | ||
559 | victim = device_find_child_by_name(dax_region->dev, buf); | |
560 | if (!victim) | |
561 | return -ENXIO; | |
562 | ||
c05ae9d8 VV |
563 | rc = down_write_killable(&dax_region_rwsem); |
564 | if (rc) | |
565 | return rc; | |
566 | rc = down_write_killable(&dax_dev_rwsem); | |
567 | if (rc) { | |
568 | up_write(&dax_region_rwsem); | |
569 | return rc; | |
570 | } | |
0f3da14a | 571 | dev_dax = to_dev_dax(victim); |
60e93dc0 | 572 | if (victim->driver || dev_dax_size(dev_dax)) |
0f3da14a DW |
573 | rc = -EBUSY; |
574 | else { | |
575 | /* | |
576 | * Invalidate the device so it does not become active | |
577 | * again, but always preserve device-id-0 so that | |
578 | * /sys/bus/dax/ is guaranteed to be populated while any | |
579 | * dax_region is registered. | |
580 | */ | |
581 | if (dev_dax->id > 0) { | |
582 | do_del = __free_dev_dax_id(dev_dax) >= 0; | |
583 | rc = len; | |
584 | if (dax_region->seed == victim) | |
585 | dax_region->seed = NULL; | |
586 | if (dax_region->youngest == victim) | |
587 | dax_region->youngest = NULL; | |
588 | } else | |
589 | rc = -EBUSY; | |
590 | } | |
c05ae9d8 | 591 | up_write(&dax_dev_rwsem); |
0f3da14a DW |
592 | |
593 | /* won the race to invalidate the device, clean it up */ | |
594 | if (do_del) | |
595 | devm_release_action(dev, unregister_dev_dax, victim); | |
c05ae9d8 | 596 | up_write(&dax_region_rwsem); |
0f3da14a DW |
597 | put_device(victim); |
598 | ||
599 | return rc; | |
600 | } | |
601 | static DEVICE_ATTR_WO(delete); | |
602 | ||
c2f3011e DW |
603 | static umode_t dax_region_visible(struct kobject *kobj, struct attribute *a, |
604 | int n) | |
605 | { | |
606 | struct device *dev = container_of(kobj, struct device, kobj); | |
607 | struct dax_region *dax_region = dev_get_drvdata(dev); | |
608 | ||
0f3da14a DW |
609 | if (is_static(dax_region)) |
610 | if (a == &dev_attr_available_size.attr | |
611 | || a == &dev_attr_create.attr | |
612 | || a == &dev_attr_seed.attr | |
613 | || a == &dev_attr_delete.attr) | |
614 | return 0; | |
c2f3011e DW |
615 | return a->mode; |
616 | } | |
617 | ||
51cf784c | 618 | static struct attribute *dax_region_attributes[] = { |
c2f3011e | 619 | &dev_attr_available_size.attr, |
51cf784c | 620 | &dev_attr_region_size.attr, |
6d82120f | 621 | &dev_attr_region_align.attr, |
0f3da14a DW |
622 | &dev_attr_create.attr, |
623 | &dev_attr_seed.attr, | |
624 | &dev_attr_delete.attr, | |
51cf784c DW |
625 | &dev_attr_id.attr, |
626 | NULL, | |
627 | }; | |
628 | ||
629 | static const struct attribute_group dax_region_attribute_group = { | |
630 | .name = "dax_region", | |
631 | .attrs = dax_region_attributes, | |
c2f3011e | 632 | .is_visible = dax_region_visible, |
51cf784c DW |
633 | }; |
634 | ||
635 | static const struct attribute_group *dax_region_attribute_groups[] = { | |
636 | &dax_region_attribute_group, | |
637 | NULL, | |
638 | }; | |
639 | ||
51cf784c DW |
640 | static void dax_region_unregister(void *region) |
641 | { | |
642 | struct dax_region *dax_region = region; | |
643 | ||
644 | sysfs_remove_groups(&dax_region->dev->kobj, | |
645 | dax_region_attribute_groups); | |
646 | dax_region_put(dax_region); | |
647 | } | |
648 | ||
649 | struct dax_region *alloc_dax_region(struct device *parent, int region_id, | |
a4574f63 | 650 | struct range *range, int target_node, unsigned int align, |
c2f3011e | 651 | unsigned long flags) |
51cf784c DW |
652 | { |
653 | struct dax_region *dax_region; | |
654 | ||
655 | /* | |
656 | * The DAX core assumes that it can store its private data in | |
657 | * parent->driver_data. This WARN is a reminder / safeguard for | |
658 | * developers of device-dax drivers. | |
659 | */ | |
660 | if (dev_get_drvdata(parent)) { | |
661 | dev_WARN(parent, "dax core failed to setup private data\n"); | |
662 | return NULL; | |
663 | } | |
664 | ||
a4574f63 DW |
665 | if (!IS_ALIGNED(range->start, align) |
666 | || !IS_ALIGNED(range_len(range), align)) | |
51cf784c DW |
667 | return NULL; |
668 | ||
669 | dax_region = kzalloc(sizeof(*dax_region), GFP_KERNEL); | |
670 | if (!dax_region) | |
671 | return NULL; | |
672 | ||
673 | dev_set_drvdata(parent, dax_region); | |
51cf784c DW |
674 | kref_init(&dax_region->kref); |
675 | dax_region->id = region_id; | |
676 | dax_region->align = align; | |
677 | dax_region->dev = parent; | |
8fc5c735 | 678 | dax_region->target_node = target_node; |
0f3da14a | 679 | ida_init(&dax_region->ida); |
c2f3011e | 680 | dax_region->res = (struct resource) { |
a4574f63 DW |
681 | .start = range->start, |
682 | .end = range->end, | |
c2f3011e DW |
683 | .flags = IORESOURCE_MEM | flags, |
684 | }; | |
685 | ||
51cf784c DW |
686 | if (sysfs_create_groups(&parent->kobj, dax_region_attribute_groups)) { |
687 | kfree(dax_region); | |
688 | return NULL; | |
689 | } | |
690 | ||
51cf784c DW |
691 | if (devm_add_action_or_reset(parent, dax_region_unregister, dax_region)) |
692 | return NULL; | |
693 | return dax_region; | |
694 | } | |
695 | EXPORT_SYMBOL_GPL(alloc_dax_region); | |
696 | ||
0b07ce87 DW |
697 | static void dax_mapping_release(struct device *dev) |
698 | { | |
699 | struct dax_mapping *mapping = to_dax_mapping(dev); | |
6d24b170 DW |
700 | struct device *parent = dev->parent; |
701 | struct dev_dax *dev_dax = to_dev_dax(parent); | |
0b07ce87 DW |
702 | |
703 | ida_free(&dev_dax->ida, mapping->id); | |
704 | kfree(mapping); | |
6d24b170 | 705 | put_device(parent); |
0b07ce87 DW |
706 | } |
707 | ||
c05ae9d8 | 708 | static void __unregister_dax_mapping(void *data) |
0b07ce87 DW |
709 | { |
710 | struct device *dev = data; | |
711 | struct dax_mapping *mapping = to_dax_mapping(dev); | |
712 | struct dev_dax *dev_dax = to_dev_dax(dev->parent); | |
0b07ce87 DW |
713 | |
714 | dev_dbg(dev, "%s\n", __func__); | |
715 | ||
c14c647b | 716 | lockdep_assert_held_write(&dax_region_rwsem); |
0b07ce87 DW |
717 | |
718 | dev_dax->ranges[mapping->range_id].mapping = NULL; | |
719 | mapping->range_id = -1; | |
720 | ||
82b4ceec | 721 | device_unregister(dev); |
0b07ce87 DW |
722 | } |
723 | ||
c05ae9d8 VV |
724 | static void unregister_dax_mapping(void *data) |
725 | { | |
726 | if (rwsem_is_locked(&dax_region_rwsem)) | |
727 | return __unregister_dax_mapping(data); | |
728 | ||
729 | if (WARN_ON_ONCE(down_write_killable(&dax_region_rwsem) != 0)) | |
730 | return; | |
731 | __unregister_dax_mapping(data); | |
732 | up_write(&dax_region_rwsem); | |
733 | } | |
734 | ||
0b07ce87 DW |
735 | static struct dev_dax_range *get_dax_range(struct device *dev) |
736 | { | |
737 | struct dax_mapping *mapping = to_dax_mapping(dev); | |
738 | struct dev_dax *dev_dax = to_dev_dax(dev->parent); | |
c05ae9d8 | 739 | int rc; |
0b07ce87 | 740 | |
c05ae9d8 VV |
741 | rc = down_write_killable(&dax_region_rwsem); |
742 | if (rc) | |
743 | return NULL; | |
0b07ce87 | 744 | if (mapping->range_id < 0) { |
c05ae9d8 | 745 | up_write(&dax_region_rwsem); |
0b07ce87 DW |
746 | return NULL; |
747 | } | |
748 | ||
749 | return &dev_dax->ranges[mapping->range_id]; | |
750 | } | |
751 | ||
c05ae9d8 | 752 | static void put_dax_range(void) |
0b07ce87 | 753 | { |
c05ae9d8 | 754 | up_write(&dax_region_rwsem); |
0b07ce87 DW |
755 | } |
756 | ||
757 | static ssize_t start_show(struct device *dev, | |
758 | struct device_attribute *attr, char *buf) | |
759 | { | |
760 | struct dev_dax_range *dax_range; | |
761 | ssize_t rc; | |
762 | ||
763 | dax_range = get_dax_range(dev); | |
764 | if (!dax_range) | |
765 | return -ENXIO; | |
6ebed000 | 766 | rc = sysfs_emit(buf, "%#llx\n", dax_range->range.start); |
c05ae9d8 | 767 | put_dax_range(); |
0b07ce87 DW |
768 | |
769 | return rc; | |
770 | } | |
771 | static DEVICE_ATTR(start, 0400, start_show, NULL); | |
772 | ||
773 | static ssize_t end_show(struct device *dev, | |
774 | struct device_attribute *attr, char *buf) | |
775 | { | |
776 | struct dev_dax_range *dax_range; | |
777 | ssize_t rc; | |
778 | ||
779 | dax_range = get_dax_range(dev); | |
780 | if (!dax_range) | |
781 | return -ENXIO; | |
6ebed000 | 782 | rc = sysfs_emit(buf, "%#llx\n", dax_range->range.end); |
c05ae9d8 | 783 | put_dax_range(); |
0b07ce87 DW |
784 | |
785 | return rc; | |
786 | } | |
787 | static DEVICE_ATTR(end, 0400, end_show, NULL); | |
788 | ||
789 | static ssize_t pgoff_show(struct device *dev, | |
790 | struct device_attribute *attr, char *buf) | |
791 | { | |
792 | struct dev_dax_range *dax_range; | |
793 | ssize_t rc; | |
794 | ||
795 | dax_range = get_dax_range(dev); | |
796 | if (!dax_range) | |
797 | return -ENXIO; | |
6ebed000 | 798 | rc = sysfs_emit(buf, "%#lx\n", dax_range->pgoff); |
c05ae9d8 | 799 | put_dax_range(); |
0b07ce87 DW |
800 | |
801 | return rc; | |
802 | } | |
803 | static DEVICE_ATTR(page_offset, 0400, pgoff_show, NULL); | |
804 | ||
805 | static struct attribute *dax_mapping_attributes[] = { | |
806 | &dev_attr_start.attr, | |
807 | &dev_attr_end.attr, | |
808 | &dev_attr_page_offset.attr, | |
809 | NULL, | |
810 | }; | |
811 | ||
812 | static const struct attribute_group dax_mapping_attribute_group = { | |
813 | .attrs = dax_mapping_attributes, | |
814 | }; | |
815 | ||
816 | static const struct attribute_group *dax_mapping_attribute_groups[] = { | |
817 | &dax_mapping_attribute_group, | |
818 | NULL, | |
819 | }; | |
820 | ||
821 | static struct device_type dax_mapping_type = { | |
822 | .release = dax_mapping_release, | |
823 | .groups = dax_mapping_attribute_groups, | |
824 | }; | |
825 | ||
826 | static int devm_register_dax_mapping(struct dev_dax *dev_dax, int range_id) | |
827 | { | |
828 | struct dax_region *dax_region = dev_dax->region; | |
829 | struct dax_mapping *mapping; | |
830 | struct device *dev; | |
831 | int rc; | |
832 | ||
c14c647b | 833 | lockdep_assert_held_write(&dax_region_rwsem); |
0b07ce87 DW |
834 | |
835 | if (dev_WARN_ONCE(&dev_dax->dev, !dax_region->dev->driver, | |
836 | "region disabled\n")) | |
837 | return -ENXIO; | |
838 | ||
839 | mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); | |
840 | if (!mapping) | |
841 | return -ENOMEM; | |
842 | mapping->range_id = range_id; | |
843 | mapping->id = ida_alloc(&dev_dax->ida, GFP_KERNEL); | |
844 | if (mapping->id < 0) { | |
845 | kfree(mapping); | |
846 | return -ENOMEM; | |
847 | } | |
848 | dev_dax->ranges[range_id].mapping = mapping; | |
849 | dev = &mapping->dev; | |
850 | device_initialize(dev); | |
851 | dev->parent = &dev_dax->dev; | |
6d24b170 | 852 | get_device(dev->parent); |
0b07ce87 DW |
853 | dev->type = &dax_mapping_type; |
854 | dev_set_name(dev, "mapping%d", mapping->id); | |
855 | rc = device_add(dev); | |
856 | if (rc) { | |
857 | put_device(dev); | |
858 | return rc; | |
859 | } | |
860 | ||
861 | rc = devm_add_action_or_reset(dax_region->dev, unregister_dax_mapping, | |
862 | dev); | |
863 | if (rc) | |
864 | return rc; | |
865 | return 0; | |
866 | } | |
867 | ||
fcffb6a1 DW |
868 | static int alloc_dev_dax_range(struct dev_dax *dev_dax, u64 start, |
869 | resource_size_t size) | |
c2f3011e DW |
870 | { |
871 | struct dax_region *dax_region = dev_dax->region; | |
872 | struct resource *res = &dax_region->res; | |
873 | struct device *dev = &dev_dax->dev; | |
60e93dc0 DW |
874 | struct dev_dax_range *ranges; |
875 | unsigned long pgoff = 0; | |
c2f3011e | 876 | struct resource *alloc; |
0b07ce87 | 877 | int i, rc; |
c2f3011e | 878 | |
c14c647b | 879 | lockdep_assert_held_write(&dax_region_rwsem); |
c2f3011e | 880 | |
0f3da14a DW |
881 | /* handle the seed alloc special case */ |
882 | if (!size) { | |
60e93dc0 DW |
883 | if (dev_WARN_ONCE(dev, dev_dax->nr_range, |
884 | "0-size allocation must be first\n")) | |
885 | return -EBUSY; | |
886 | /* nr_range == 0 is elsewhere special cased as 0-size device */ | |
0f3da14a DW |
887 | return 0; |
888 | } | |
889 | ||
ff8da37d ZL |
890 | alloc = __request_region(res, start, size, dev_name(dev), 0); |
891 | if (!alloc) | |
60e93dc0 DW |
892 | return -ENOMEM; |
893 | ||
ff8da37d ZL |
894 | ranges = krealloc(dev_dax->ranges, sizeof(*ranges) |
895 | * (dev_dax->nr_range + 1), GFP_KERNEL); | |
896 | if (!ranges) { | |
897 | __release_region(res, alloc->start, resource_size(alloc)); | |
c2f3011e | 898 | return -ENOMEM; |
60e93dc0 | 899 | } |
c2f3011e | 900 | |
60e93dc0 DW |
901 | for (i = 0; i < dev_dax->nr_range; i++) |
902 | pgoff += PHYS_PFN(range_len(&ranges[i].range)); | |
903 | dev_dax->ranges = ranges; | |
904 | ranges[dev_dax->nr_range++] = (struct dev_dax_range) { | |
905 | .pgoff = pgoff, | |
906 | .range = { | |
907 | .start = alloc->start, | |
908 | .end = alloc->end, | |
909 | }, | |
c2f3011e DW |
910 | }; |
911 | ||
60e93dc0 DW |
912 | dev_dbg(dev, "alloc range[%d]: %pa:%pa\n", dev_dax->nr_range - 1, |
913 | &alloc->start, &alloc->end); | |
0b07ce87 DW |
914 | /* |
915 | * A dev_dax instance must be registered before mapping device | |
916 | * children can be added. Defer to devm_create_dev_dax() to add | |
917 | * the initial mapping device. | |
918 | */ | |
919 | if (!device_is_registered(&dev_dax->dev)) | |
920 | return 0; | |
921 | ||
922 | rc = devm_register_dax_mapping(dev_dax, dev_dax->nr_range - 1); | |
6268d7da DW |
923 | if (rc) |
924 | trim_dev_dax_range(dev_dax); | |
60e93dc0 | 925 | |
6268d7da | 926 | return rc; |
c2f3011e DW |
927 | } |
928 | ||
fcffb6a1 DW |
929 | static int adjust_dev_dax_range(struct dev_dax *dev_dax, struct resource *res, resource_size_t size) |
930 | { | |
60e93dc0 DW |
931 | int last_range = dev_dax->nr_range - 1; |
932 | struct dev_dax_range *dax_range = &dev_dax->ranges[last_range]; | |
60e93dc0 DW |
933 | bool is_shrink = resource_size(res) > size; |
934 | struct range *range = &dax_range->range; | |
935 | struct device *dev = &dev_dax->dev; | |
936 | int rc; | |
fcffb6a1 | 937 | |
c14c647b | 938 | lockdep_assert_held_write(&dax_region_rwsem); |
fcffb6a1 | 939 | |
60e93dc0 DW |
940 | if (dev_WARN_ONCE(dev, !size, "deletion is handled by dev_dax_shrink\n")) |
941 | return -EINVAL; | |
942 | ||
943 | rc = adjust_resource(res, range->start, size); | |
fcffb6a1 DW |
944 | if (rc) |
945 | return rc; | |
946 | ||
60e93dc0 | 947 | *range = (struct range) { |
fcffb6a1 DW |
948 | .start = range->start, |
949 | .end = range->start + size - 1, | |
950 | }; | |
951 | ||
60e93dc0 DW |
952 | dev_dbg(dev, "%s range[%d]: %#llx:%#llx\n", is_shrink ? "shrink" : "extend", |
953 | last_range, (unsigned long long) range->start, | |
954 | (unsigned long long) range->end); | |
955 | ||
fcffb6a1 DW |
956 | return 0; |
957 | } | |
958 | ||
51cf784c DW |
959 | static ssize_t size_show(struct device *dev, |
960 | struct device_attribute *attr, char *buf) | |
961 | { | |
962 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
60e93dc0 | 963 | unsigned long long size; |
c05ae9d8 | 964 | int rc; |
60e93dc0 | 965 | |
c05ae9d8 VV |
966 | rc = down_write_killable(&dax_dev_rwsem); |
967 | if (rc) | |
968 | return rc; | |
60e93dc0 | 969 | size = dev_dax_size(dev_dax); |
c05ae9d8 | 970 | up_write(&dax_dev_rwsem); |
51cf784c | 971 | |
6ebed000 | 972 | return sysfs_emit(buf, "%llu\n", size); |
51cf784c | 973 | } |
fcffb6a1 | 974 | |
6d82120f | 975 | static bool alloc_is_aligned(struct dev_dax *dev_dax, resource_size_t size) |
fcffb6a1 DW |
976 | { |
977 | /* | |
978 | * The minimum mapping granularity for a device instance is a | |
979 | * single subsection, unless the arch says otherwise. | |
980 | */ | |
6d82120f | 981 | return IS_ALIGNED(size, max_t(unsigned long, dev_dax->align, memremap_compat_align())); |
fcffb6a1 DW |
982 | } |
983 | ||
984 | static int dev_dax_shrink(struct dev_dax *dev_dax, resource_size_t size) | |
985 | { | |
60e93dc0 | 986 | resource_size_t to_shrink = dev_dax_size(dev_dax) - size; |
fcffb6a1 | 987 | struct dax_region *dax_region = dev_dax->region; |
fcffb6a1 | 988 | struct device *dev = &dev_dax->dev; |
60e93dc0 DW |
989 | int i; |
990 | ||
991 | for (i = dev_dax->nr_range - 1; i >= 0; i--) { | |
992 | struct range *range = &dev_dax->ranges[i].range; | |
0b07ce87 | 993 | struct dax_mapping *mapping = dev_dax->ranges[i].mapping; |
60e93dc0 DW |
994 | struct resource *adjust = NULL, *res; |
995 | resource_size_t shrink; | |
996 | ||
997 | shrink = min_t(u64, to_shrink, range_len(range)); | |
998 | if (shrink >= range_len(range)) { | |
0b07ce87 DW |
999 | devm_release_action(dax_region->dev, |
1000 | unregister_dax_mapping, &mapping->dev); | |
6268d7da | 1001 | trim_dev_dax_range(dev_dax); |
60e93dc0 DW |
1002 | to_shrink -= shrink; |
1003 | if (!to_shrink) | |
1004 | break; | |
1005 | continue; | |
fcffb6a1 DW |
1006 | } |
1007 | ||
60e93dc0 DW |
1008 | for_each_dax_region_resource(dax_region, res) |
1009 | if (strcmp(res->name, dev_name(dev)) == 0 | |
1010 | && res->start == range->start) { | |
1011 | adjust = res; | |
1012 | break; | |
1013 | } | |
1014 | ||
1015 | if (dev_WARN_ONCE(dev, !adjust || i != dev_dax->nr_range - 1, | |
1016 | "failed to find matching resource\n")) | |
1017 | return -ENXIO; | |
1018 | return adjust_dev_dax_range(dev_dax, adjust, range_len(range) | |
1019 | - shrink); | |
1020 | } | |
1021 | return 0; | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * Only allow adjustments that preserve the relative pgoff of existing | |
1026 | * allocations. I.e. the dev_dax->ranges array is ordered by increasing pgoff. | |
1027 | */ | |
1028 | static bool adjust_ok(struct dev_dax *dev_dax, struct resource *res) | |
1029 | { | |
1030 | struct dev_dax_range *last; | |
1031 | int i; | |
1032 | ||
1033 | if (dev_dax->nr_range == 0) | |
1034 | return false; | |
1035 | if (strcmp(res->name, dev_name(&dev_dax->dev)) != 0) | |
1036 | return false; | |
1037 | last = &dev_dax->ranges[dev_dax->nr_range - 1]; | |
1038 | if (last->range.start != res->start || last->range.end != res->end) | |
1039 | return false; | |
1040 | for (i = 0; i < dev_dax->nr_range - 1; i++) { | |
1041 | struct dev_dax_range *dax_range = &dev_dax->ranges[i]; | |
1042 | ||
1043 | if (dax_range->pgoff > last->pgoff) | |
1044 | return false; | |
1045 | } | |
1046 | ||
1047 | return true; | |
fcffb6a1 DW |
1048 | } |
1049 | ||
1050 | static ssize_t dev_dax_resize(struct dax_region *dax_region, | |
1051 | struct dev_dax *dev_dax, resource_size_t size) | |
1052 | { | |
1053 | resource_size_t avail = dax_region_avail_size(dax_region), to_alloc; | |
60e93dc0 | 1054 | resource_size_t dev_size = dev_dax_size(dev_dax); |
fcffb6a1 DW |
1055 | struct resource *region_res = &dax_region->res; |
1056 | struct device *dev = &dev_dax->dev; | |
fcffb6a1 | 1057 | struct resource *res, *first; |
60e93dc0 DW |
1058 | resource_size_t alloc = 0; |
1059 | int rc; | |
fcffb6a1 DW |
1060 | |
1061 | if (dev->driver) | |
1062 | return -EBUSY; | |
1063 | if (size == dev_size) | |
1064 | return 0; | |
1065 | if (size > dev_size && size - dev_size > avail) | |
1066 | return -ENOSPC; | |
1067 | if (size < dev_size) | |
1068 | return dev_dax_shrink(dev_dax, size); | |
1069 | ||
1070 | to_alloc = size - dev_size; | |
6d82120f | 1071 | if (dev_WARN_ONCE(dev, !alloc_is_aligned(dev_dax, to_alloc), |
fcffb6a1 DW |
1072 | "resize of %pa misaligned\n", &to_alloc)) |
1073 | return -ENXIO; | |
1074 | ||
1075 | /* | |
1076 | * Expand the device into the unused portion of the region. This | |
1077 | * may involve adjusting the end of an existing resource, or | |
1078 | * allocating a new resource. | |
1079 | */ | |
60e93dc0 | 1080 | retry: |
fcffb6a1 DW |
1081 | first = region_res->child; |
1082 | if (!first) | |
1083 | return alloc_dev_dax_range(dev_dax, dax_region->res.start, to_alloc); | |
60e93dc0 DW |
1084 | |
1085 | rc = -ENOSPC; | |
1086 | for (res = first; res; res = res->sibling) { | |
fcffb6a1 | 1087 | struct resource *next = res->sibling; |
fcffb6a1 DW |
1088 | |
1089 | /* space at the beginning of the region */ | |
60e93dc0 DW |
1090 | if (res == first && res->start > dax_region->res.start) { |
1091 | alloc = min(res->start - dax_region->res.start, to_alloc); | |
1092 | rc = alloc_dev_dax_range(dev_dax, dax_region->res.start, alloc); | |
1093 | break; | |
1094 | } | |
fcffb6a1 | 1095 | |
60e93dc0 | 1096 | alloc = 0; |
fcffb6a1 DW |
1097 | /* space between allocations */ |
1098 | if (next && next->start > res->end + 1) | |
60e93dc0 | 1099 | alloc = min(next->start - (res->end + 1), to_alloc); |
fcffb6a1 DW |
1100 | |
1101 | /* space at the end of the region */ | |
60e93dc0 DW |
1102 | if (!alloc && !next && res->end < region_res->end) |
1103 | alloc = min(region_res->end - res->end, to_alloc); | |
fcffb6a1 | 1104 | |
60e93dc0 DW |
1105 | if (!alloc) |
1106 | continue; | |
1107 | ||
1108 | if (adjust_ok(dev_dax, res)) { | |
1109 | rc = adjust_dev_dax_range(dev_dax, res, resource_size(res) + alloc); | |
1110 | break; | |
1111 | } | |
1112 | rc = alloc_dev_dax_range(dev_dax, res->end + 1, alloc); | |
1113 | break; | |
fcffb6a1 | 1114 | } |
60e93dc0 DW |
1115 | if (rc) |
1116 | return rc; | |
1117 | to_alloc -= alloc; | |
1118 | if (to_alloc) | |
1119 | goto retry; | |
1120 | return 0; | |
fcffb6a1 DW |
1121 | } |
1122 | ||
1123 | static ssize_t size_store(struct device *dev, struct device_attribute *attr, | |
1124 | const char *buf, size_t len) | |
1125 | { | |
1126 | ssize_t rc; | |
1127 | unsigned long long val; | |
1128 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
1129 | struct dax_region *dax_region = dev_dax->region; | |
1130 | ||
1131 | rc = kstrtoull(buf, 0, &val); | |
1132 | if (rc) | |
1133 | return rc; | |
1134 | ||
6d82120f | 1135 | if (!alloc_is_aligned(dev_dax, val)) { |
fcffb6a1 DW |
1136 | dev_dbg(dev, "%s: size: %lld misaligned\n", __func__, val); |
1137 | return -EINVAL; | |
1138 | } | |
1139 | ||
c05ae9d8 VV |
1140 | rc = down_write_killable(&dax_region_rwsem); |
1141 | if (rc) | |
1142 | return rc; | |
fcffb6a1 | 1143 | if (!dax_region->dev->driver) { |
c05ae9d8 VV |
1144 | rc = -ENXIO; |
1145 | goto err_region; | |
fcffb6a1 | 1146 | } |
c05ae9d8 VV |
1147 | rc = down_write_killable(&dax_dev_rwsem); |
1148 | if (rc) | |
1149 | goto err_dev; | |
1150 | ||
fcffb6a1 | 1151 | rc = dev_dax_resize(dax_region, dev_dax, val); |
fcffb6a1 | 1152 | |
c05ae9d8 VV |
1153 | err_dev: |
1154 | up_write(&dax_dev_rwsem); | |
1155 | err_region: | |
1156 | up_write(&dax_region_rwsem); | |
1157 | ||
1158 | if (rc == 0) | |
1159 | return len; | |
1160 | return rc; | |
fcffb6a1 DW |
1161 | } |
1162 | static DEVICE_ATTR_RW(size); | |
51cf784c | 1163 | |
8490e2e2 JM |
1164 | static ssize_t range_parse(const char *opt, size_t len, struct range *range) |
1165 | { | |
1166 | unsigned long long addr = 0; | |
1167 | char *start, *end, *str; | |
7323fb22 | 1168 | ssize_t rc = -EINVAL; |
8490e2e2 JM |
1169 | |
1170 | str = kstrdup(opt, GFP_KERNEL); | |
1171 | if (!str) | |
1172 | return rc; | |
1173 | ||
1174 | end = str; | |
1175 | start = strsep(&end, "-"); | |
1176 | if (!start || !end) | |
1177 | goto err; | |
1178 | ||
1179 | rc = kstrtoull(start, 16, &addr); | |
1180 | if (rc) | |
1181 | goto err; | |
1182 | range->start = addr; | |
1183 | ||
1184 | rc = kstrtoull(end, 16, &addr); | |
1185 | if (rc) | |
1186 | goto err; | |
1187 | range->end = addr; | |
1188 | ||
1189 | err: | |
1190 | kfree(str); | |
1191 | return rc; | |
1192 | } | |
1193 | ||
1194 | static ssize_t mapping_store(struct device *dev, struct device_attribute *attr, | |
1195 | const char *buf, size_t len) | |
1196 | { | |
1197 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
1198 | struct dax_region *dax_region = dev_dax->region; | |
1199 | size_t to_alloc; | |
1200 | struct range r; | |
1201 | ssize_t rc; | |
1202 | ||
1203 | rc = range_parse(buf, len, &r); | |
1204 | if (rc) | |
1205 | return rc; | |
1206 | ||
1207 | rc = -ENXIO; | |
c05ae9d8 VV |
1208 | rc = down_write_killable(&dax_region_rwsem); |
1209 | if (rc) | |
1210 | return rc; | |
8490e2e2 | 1211 | if (!dax_region->dev->driver) { |
c05ae9d8 VV |
1212 | up_write(&dax_region_rwsem); |
1213 | return rc; | |
1214 | } | |
1215 | rc = down_write_killable(&dax_dev_rwsem); | |
1216 | if (rc) { | |
1217 | up_write(&dax_region_rwsem); | |
8490e2e2 JM |
1218 | return rc; |
1219 | } | |
8490e2e2 JM |
1220 | |
1221 | to_alloc = range_len(&r); | |
1222 | if (alloc_is_aligned(dev_dax, to_alloc)) | |
1223 | rc = alloc_dev_dax_range(dev_dax, r.start, to_alloc); | |
c05ae9d8 VV |
1224 | up_write(&dax_dev_rwsem); |
1225 | up_write(&dax_region_rwsem); | |
8490e2e2 JM |
1226 | |
1227 | return rc == 0 ? len : rc; | |
1228 | } | |
1229 | static DEVICE_ATTR_WO(mapping); | |
1230 | ||
6d82120f DW |
1231 | static ssize_t align_show(struct device *dev, |
1232 | struct device_attribute *attr, char *buf) | |
1233 | { | |
1234 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
1235 | ||
6ebed000 | 1236 | return sysfs_emit(buf, "%d\n", dev_dax->align); |
6d82120f DW |
1237 | } |
1238 | ||
1239 | static ssize_t dev_dax_validate_align(struct dev_dax *dev_dax) | |
1240 | { | |
6d82120f DW |
1241 | struct device *dev = &dev_dax->dev; |
1242 | int i; | |
1243 | ||
6d82120f DW |
1244 | for (i = 0; i < dev_dax->nr_range; i++) { |
1245 | size_t len = range_len(&dev_dax->ranges[i].range); | |
1246 | ||
1247 | if (!alloc_is_aligned(dev_dax, len)) { | |
1248 | dev_dbg(dev, "%s: align %u invalid for range %d\n", | |
1249 | __func__, dev_dax->align, i); | |
1250 | return -EINVAL; | |
1251 | } | |
1252 | } | |
1253 | ||
1254 | return 0; | |
1255 | } | |
1256 | ||
1257 | static ssize_t align_store(struct device *dev, struct device_attribute *attr, | |
1258 | const char *buf, size_t len) | |
1259 | { | |
1260 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
1261 | struct dax_region *dax_region = dev_dax->region; | |
1262 | unsigned long val, align_save; | |
1263 | ssize_t rc; | |
1264 | ||
1265 | rc = kstrtoul(buf, 0, &val); | |
1266 | if (rc) | |
1267 | return -ENXIO; | |
1268 | ||
1269 | if (!dax_align_valid(val)) | |
1270 | return -EINVAL; | |
1271 | ||
c05ae9d8 VV |
1272 | rc = down_write_killable(&dax_region_rwsem); |
1273 | if (rc) | |
1274 | return rc; | |
6d82120f | 1275 | if (!dax_region->dev->driver) { |
c05ae9d8 | 1276 | up_write(&dax_region_rwsem); |
6d82120f DW |
1277 | return -ENXIO; |
1278 | } | |
1279 | ||
c05ae9d8 VV |
1280 | rc = down_write_killable(&dax_dev_rwsem); |
1281 | if (rc) { | |
1282 | up_write(&dax_region_rwsem); | |
1283 | return rc; | |
1284 | } | |
6d82120f DW |
1285 | if (dev->driver) { |
1286 | rc = -EBUSY; | |
1287 | goto out_unlock; | |
1288 | } | |
1289 | ||
1290 | align_save = dev_dax->align; | |
1291 | dev_dax->align = val; | |
1292 | rc = dev_dax_validate_align(dev_dax); | |
1293 | if (rc) | |
1294 | dev_dax->align = align_save; | |
1295 | out_unlock: | |
c05ae9d8 VV |
1296 | up_write(&dax_dev_rwsem); |
1297 | up_write(&dax_region_rwsem); | |
6d82120f DW |
1298 | return rc == 0 ? len : rc; |
1299 | } | |
1300 | static DEVICE_ATTR_RW(align); | |
1301 | ||
21c75763 DW |
1302 | static int dev_dax_target_node(struct dev_dax *dev_dax) |
1303 | { | |
1304 | struct dax_region *dax_region = dev_dax->region; | |
1305 | ||
1306 | return dax_region->target_node; | |
1307 | } | |
1308 | ||
1309 | static ssize_t target_node_show(struct device *dev, | |
1310 | struct device_attribute *attr, char *buf) | |
1311 | { | |
1312 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
1313 | ||
6ebed000 | 1314 | return sysfs_emit(buf, "%d\n", dev_dax_target_node(dev_dax)); |
21c75763 DW |
1315 | } |
1316 | static DEVICE_ATTR_RO(target_node); | |
1317 | ||
40cdc60a VV |
1318 | static ssize_t resource_show(struct device *dev, |
1319 | struct device_attribute *attr, char *buf) | |
1320 | { | |
1321 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
60e93dc0 DW |
1322 | struct dax_region *dax_region = dev_dax->region; |
1323 | unsigned long long start; | |
1324 | ||
1325 | if (dev_dax->nr_range < 1) | |
1326 | start = dax_region->res.start; | |
1327 | else | |
1328 | start = dev_dax->ranges[0].range.start; | |
40cdc60a | 1329 | |
6ebed000 | 1330 | return sysfs_emit(buf, "%#llx\n", start); |
40cdc60a | 1331 | } |
153dd286 | 1332 | static DEVICE_ATTR(resource, 0400, resource_show, NULL); |
40cdc60a | 1333 | |
c347bd71 VV |
1334 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, |
1335 | char *buf) | |
1336 | { | |
1337 | /* | |
1338 | * We only ever expect to handle device-dax instances, i.e. the | |
1339 | * @type argument to MODULE_ALIAS_DAX_DEVICE() is always zero | |
1340 | */ | |
6ebed000 | 1341 | return sysfs_emit(buf, DAX_DEVICE_MODALIAS_FMT "\n", 0); |
c347bd71 VV |
1342 | } |
1343 | static DEVICE_ATTR_RO(modalias); | |
1344 | ||
cb4dd729 DW |
1345 | static ssize_t numa_node_show(struct device *dev, |
1346 | struct device_attribute *attr, char *buf) | |
1347 | { | |
6ebed000 | 1348 | return sysfs_emit(buf, "%d\n", dev_to_node(dev)); |
cb4dd729 DW |
1349 | } |
1350 | static DEVICE_ATTR_RO(numa_node); | |
1351 | ||
73954d37 VV |
1352 | static ssize_t memmap_on_memory_show(struct device *dev, |
1353 | struct device_attribute *attr, char *buf) | |
1354 | { | |
1355 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
1356 | ||
1357 | return sysfs_emit(buf, "%d\n", dev_dax->memmap_on_memory); | |
1358 | } | |
1359 | ||
1360 | static ssize_t memmap_on_memory_store(struct device *dev, | |
1361 | struct device_attribute *attr, | |
1362 | const char *buf, size_t len) | |
1363 | { | |
1364 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
1365 | bool val; | |
1366 | int rc; | |
1367 | ||
1368 | rc = kstrtobool(buf, &val); | |
1369 | if (rc) | |
1370 | return rc; | |
1371 | ||
1372 | if (val == true && !mhp_supports_memmap_on_memory()) { | |
1373 | dev_dbg(dev, "memmap_on_memory is not available\n"); | |
1374 | return -EOPNOTSUPP; | |
1375 | } | |
1376 | ||
1377 | rc = down_write_killable(&dax_dev_rwsem); | |
1378 | if (rc) | |
1379 | return rc; | |
1380 | ||
1381 | if (dev_dax->memmap_on_memory != val && dev->driver && | |
1382 | to_dax_drv(dev->driver)->type == DAXDRV_KMEM_TYPE) { | |
1383 | up_write(&dax_dev_rwsem); | |
1384 | return -EBUSY; | |
1385 | } | |
1386 | ||
1387 | dev_dax->memmap_on_memory = val; | |
1388 | up_write(&dax_dev_rwsem); | |
1389 | ||
1390 | return len; | |
1391 | } | |
1392 | static DEVICE_ATTR_RW(memmap_on_memory); | |
1393 | ||
21c75763 DW |
1394 | static umode_t dev_dax_visible(struct kobject *kobj, struct attribute *a, int n) |
1395 | { | |
1396 | struct device *dev = container_of(kobj, struct device, kobj); | |
1397 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
fcffb6a1 | 1398 | struct dax_region *dax_region = dev_dax->region; |
21c75763 DW |
1399 | |
1400 | if (a == &dev_attr_target_node.attr && dev_dax_target_node(dev_dax) < 0) | |
1401 | return 0; | |
cb4dd729 DW |
1402 | if (a == &dev_attr_numa_node.attr && !IS_ENABLED(CONFIG_NUMA)) |
1403 | return 0; | |
8490e2e2 JM |
1404 | if (a == &dev_attr_mapping.attr && is_static(dax_region)) |
1405 | return 0; | |
6d82120f DW |
1406 | if ((a == &dev_attr_align.attr || |
1407 | a == &dev_attr_size.attr) && is_static(dax_region)) | |
fcffb6a1 | 1408 | return 0444; |
21c75763 DW |
1409 | return a->mode; |
1410 | } | |
1411 | ||
51cf784c | 1412 | static struct attribute *dev_dax_attributes[] = { |
c347bd71 | 1413 | &dev_attr_modalias.attr, |
51cf784c | 1414 | &dev_attr_size.attr, |
8490e2e2 | 1415 | &dev_attr_mapping.attr, |
21c75763 | 1416 | &dev_attr_target_node.attr, |
6d82120f | 1417 | &dev_attr_align.attr, |
40cdc60a | 1418 | &dev_attr_resource.attr, |
cb4dd729 | 1419 | &dev_attr_numa_node.attr, |
73954d37 | 1420 | &dev_attr_memmap_on_memory.attr, |
51cf784c DW |
1421 | NULL, |
1422 | }; | |
1423 | ||
1424 | static const struct attribute_group dev_dax_attribute_group = { | |
1425 | .attrs = dev_dax_attributes, | |
21c75763 | 1426 | .is_visible = dev_dax_visible, |
51cf784c DW |
1427 | }; |
1428 | ||
9567da0b | 1429 | static const struct attribute_group *dax_attribute_groups[] = { |
51cf784c DW |
1430 | &dev_dax_attribute_group, |
1431 | NULL, | |
1432 | }; | |
51cf784c | 1433 | |
9567da0b | 1434 | static void dev_dax_release(struct device *dev) |
51cf784c DW |
1435 | { |
1436 | struct dev_dax *dev_dax = to_dev_dax(dev); | |
1437 | struct dax_device *dax_dev = dev_dax->dax_dev; | |
51cf784c | 1438 | |
9567da0b | 1439 | put_dax(dax_dev); |
0f3da14a | 1440 | free_dev_dax_id(dev_dax); |
f5516ec5 | 1441 | kfree(dev_dax->pgmap); |
9567da0b DW |
1442 | kfree(dev_dax); |
1443 | } | |
1444 | ||
770619a9 DW |
1445 | static const struct device_type dev_dax_type = { |
1446 | .release = dev_dax_release, | |
1447 | .groups = dax_attribute_groups, | |
1448 | }; | |
1449 | ||
c05ae9d8 | 1450 | static struct dev_dax *__devm_create_dev_dax(struct dev_dax_data *data) |
9567da0b | 1451 | { |
174ebece | 1452 | struct dax_region *dax_region = data->dax_region; |
9567da0b DW |
1453 | struct device *parent = dax_region->dev; |
1454 | struct dax_device *dax_dev; | |
1455 | struct dev_dax *dev_dax; | |
1456 | struct inode *inode; | |
1457 | struct device *dev; | |
c2f3011e | 1458 | int rc; |
9567da0b | 1459 | |
9567da0b DW |
1460 | dev_dax = kzalloc(sizeof(*dev_dax), GFP_KERNEL); |
1461 | if (!dev_dax) | |
1462 | return ERR_PTR(-ENOMEM); | |
1463 | ||
70aab281 | 1464 | dev_dax->region = dax_region; |
0f3da14a DW |
1465 | if (is_static(dax_region)) { |
1466 | if (dev_WARN_ONCE(parent, data->id < 0, | |
1467 | "dynamic id specified to static region\n")) { | |
1468 | rc = -EINVAL; | |
1469 | goto err_id; | |
1470 | } | |
1471 | ||
1472 | dev_dax->id = data->id; | |
1473 | } else { | |
1474 | if (dev_WARN_ONCE(parent, data->id >= 0, | |
1475 | "static id specified to dynamic region\n")) { | |
1476 | rc = -EINVAL; | |
1477 | goto err_id; | |
1478 | } | |
1479 | ||
70aab281 | 1480 | rc = alloc_dev_dax_id(dev_dax); |
0f3da14a DW |
1481 | if (rc < 0) |
1482 | goto err_id; | |
0f3da14a DW |
1483 | } |
1484 | ||
c2f3011e DW |
1485 | dev = &dev_dax->dev; |
1486 | device_initialize(dev); | |
0f3da14a | 1487 | dev_set_name(dev, "dax%d.%d", dax_region->id, dev_dax->id); |
c2f3011e | 1488 | |
fcffb6a1 | 1489 | rc = alloc_dev_dax_range(dev_dax, dax_region->res.start, data->size); |
c2f3011e DW |
1490 | if (rc) |
1491 | goto err_range; | |
1492 | ||
f5516ec5 | 1493 | if (data->pgmap) { |
c2f3011e DW |
1494 | dev_WARN_ONCE(parent, !is_static(dax_region), |
1495 | "custom dev_pagemap requires a static dax_region\n"); | |
1496 | ||
f5516ec5 DW |
1497 | dev_dax->pgmap = kmemdup(data->pgmap, |
1498 | sizeof(struct dev_pagemap), GFP_KERNEL); | |
c2f3011e DW |
1499 | if (!dev_dax->pgmap) { |
1500 | rc = -ENOMEM; | |
f5516ec5 | 1501 | goto err_pgmap; |
c2f3011e | 1502 | } |
f5516ec5 | 1503 | } |
89ec9f2c | 1504 | |
9567da0b | 1505 | /* |
fb08a190 CH |
1506 | * No dax_operations since there is no access to this device outside of |
1507 | * mmap of the resulting character device. | |
9567da0b | 1508 | */ |
30c6828a | 1509 | dax_dev = alloc_dax(dev_dax, NULL); |
4e4ced93 VG |
1510 | if (IS_ERR(dax_dev)) { |
1511 | rc = PTR_ERR(dax_dev); | |
f5516ec5 | 1512 | goto err_alloc_dax; |
4e4ced93 | 1513 | } |
30c6828a | 1514 | set_dax_synchronous(dax_dev); |
7ac5360c CH |
1515 | set_dax_nocache(dax_dev); |
1516 | set_dax_nomc(dax_dev); | |
9567da0b DW |
1517 | |
1518 | /* a device_dax instance is dead while the driver is not attached */ | |
1519 | kill_dax(dax_dev); | |
1520 | ||
9567da0b | 1521 | dev_dax->dax_dev = dax_dev; |
8fc5c735 | 1522 | dev_dax->target_node = dax_region->target_node; |
33cf94d7 | 1523 | dev_dax->align = dax_region->align; |
0b07ce87 | 1524 | ida_init(&dev_dax->ida); |
9567da0b | 1525 | |
4eca0ef4 VV |
1526 | dev_dax->memmap_on_memory = data->memmap_on_memory; |
1527 | ||
9567da0b DW |
1528 | inode = dax_inode(dax_dev); |
1529 | dev->devt = inode->i_rdev; | |
83762cb5 | 1530 | dev->bus = &dax_bus_type; |
9567da0b | 1531 | dev->parent = parent; |
770619a9 | 1532 | dev->type = &dev_dax_type; |
9567da0b DW |
1533 | |
1534 | rc = device_add(dev); | |
1535 | if (rc) { | |
1536 | kill_dev_dax(dev_dax); | |
1537 | put_device(dev); | |
1538 | return ERR_PTR(rc); | |
1539 | } | |
1540 | ||
1541 | rc = devm_add_action_or_reset(dax_region->dev, unregister_dev_dax, dev); | |
1542 | if (rc) | |
1543 | return ERR_PTR(rc); | |
1544 | ||
0b07ce87 DW |
1545 | /* register mapping device for the initial allocation range */ |
1546 | if (dev_dax->nr_range && range_len(&dev_dax->ranges[0].range)) { | |
1547 | rc = devm_register_dax_mapping(dev_dax, 0); | |
1548 | if (rc) | |
1549 | return ERR_PTR(rc); | |
1550 | } | |
1551 | ||
9567da0b | 1552 | return dev_dax; |
c2f3011e | 1553 | |
f5516ec5 DW |
1554 | err_alloc_dax: |
1555 | kfree(dev_dax->pgmap); | |
1556 | err_pgmap: | |
60e93dc0 | 1557 | free_dev_dax_ranges(dev_dax); |
c2f3011e | 1558 | err_range: |
0f3da14a DW |
1559 | free_dev_dax_id(dev_dax); |
1560 | err_id: | |
9567da0b DW |
1561 | kfree(dev_dax); |
1562 | ||
1563 | return ERR_PTR(rc); | |
1564 | } | |
c05ae9d8 VV |
1565 | |
1566 | struct dev_dax *devm_create_dev_dax(struct dev_dax_data *data) | |
1567 | { | |
1568 | struct dev_dax *dev_dax; | |
1569 | int rc; | |
1570 | ||
1571 | rc = down_write_killable(&dax_region_rwsem); | |
1572 | if (rc) | |
1573 | return ERR_PTR(rc); | |
1574 | ||
1575 | dev_dax = __devm_create_dev_dax(data); | |
1576 | up_write(&dax_region_rwsem); | |
1577 | ||
1578 | return dev_dax; | |
1579 | } | |
174ebece | 1580 | EXPORT_SYMBOL_GPL(devm_create_dev_dax); |
9567da0b | 1581 | |
d200781e | 1582 | int __dax_driver_register(struct dax_device_driver *dax_drv, |
9567da0b DW |
1583 | struct module *module, const char *mod_name) |
1584 | { | |
d200781e | 1585 | struct device_driver *drv = &dax_drv->drv; |
d200781e | 1586 | |
5b8e64f1 UKK |
1587 | /* |
1588 | * dax_bus_probe() calls dax_drv->probe() unconditionally. | |
1589 | * So better be safe than sorry and ensure it is provided. | |
1590 | */ | |
1591 | if (!dax_drv->probe) | |
1592 | return -EINVAL; | |
1593 | ||
d200781e | 1594 | INIT_LIST_HEAD(&dax_drv->ids); |
9567da0b DW |
1595 | drv->owner = module; |
1596 | drv->name = mod_name; | |
1597 | drv->mod_name = mod_name; | |
1598 | drv->bus = &dax_bus_type; | |
d200781e | 1599 | |
e9ee9fe3 | 1600 | return driver_register(drv); |
9567da0b DW |
1601 | } |
1602 | EXPORT_SYMBOL_GPL(__dax_driver_register); | |
1603 | ||
d200781e DW |
1604 | void dax_driver_unregister(struct dax_device_driver *dax_drv) |
1605 | { | |
730926c3 | 1606 | struct device_driver *drv = &dax_drv->drv; |
d200781e DW |
1607 | struct dax_id *dax_id, *_id; |
1608 | ||
1609 | mutex_lock(&dax_bus_lock); | |
d200781e DW |
1610 | list_for_each_entry_safe(dax_id, _id, &dax_drv->ids, list) { |
1611 | list_del(&dax_id->list); | |
1612 | kfree(dax_id); | |
1613 | } | |
1614 | mutex_unlock(&dax_bus_lock); | |
730926c3 | 1615 | driver_unregister(drv); |
d200781e DW |
1616 | } |
1617 | EXPORT_SYMBOL_GPL(dax_driver_unregister); | |
1618 | ||
9567da0b DW |
1619 | int __init dax_bus_init(void) |
1620 | { | |
83762cb5 | 1621 | return bus_register(&dax_bus_type); |
9567da0b DW |
1622 | } |
1623 | ||
1624 | void __exit dax_bus_exit(void) | |
1625 | { | |
1626 | bus_unregister(&dax_bus_type); | |
1627 | } |