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