]>
Commit | Line | Data |
---|---|---|
45def22c DW |
1 | /* |
2 | * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | */ | |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
62232e45 | 14 | #include <linux/vmalloc.h> |
45def22c | 15 | #include <linux/uaccess.h> |
3d88002e | 16 | #include <linux/module.h> |
8c2f7e86 | 17 | #include <linux/blkdev.h> |
45def22c | 18 | #include <linux/fcntl.h> |
e6dfb2de | 19 | #include <linux/async.h> |
8c2f7e86 | 20 | #include <linux/genhd.h> |
62232e45 | 21 | #include <linux/ndctl.h> |
4d88a97a | 22 | #include <linux/sched.h> |
45def22c DW |
23 | #include <linux/slab.h> |
24 | #include <linux/fs.h> | |
25 | #include <linux/io.h> | |
62232e45 | 26 | #include <linux/mm.h> |
4d88a97a | 27 | #include <linux/nd.h> |
45def22c | 28 | #include "nd-core.h" |
4d88a97a | 29 | #include "nd.h" |
45def22c | 30 | |
62232e45 | 31 | int nvdimm_major; |
45def22c DW |
32 | static int nvdimm_bus_major; |
33 | static struct class *nd_class; | |
34 | ||
4d88a97a DW |
35 | static int to_nd_device_type(struct device *dev) |
36 | { | |
37 | if (is_nvdimm(dev)) | |
38 | return ND_DEVICE_DIMM; | |
3d88002e DW |
39 | else if (is_nd_pmem(dev)) |
40 | return ND_DEVICE_REGION_PMEM; | |
41 | else if (is_nd_blk(dev)) | |
42 | return ND_DEVICE_REGION_BLK; | |
cd03412a DW |
43 | else if (is_nd_dax(dev)) |
44 | return ND_DEVICE_DAX_PMEM; | |
3d88002e DW |
45 | else if (is_nd_pmem(dev->parent) || is_nd_blk(dev->parent)) |
46 | return nd_region_to_nstype(to_nd_region(dev->parent)); | |
4d88a97a DW |
47 | |
48 | return 0; | |
49 | } | |
50 | ||
51 | static int nvdimm_bus_uevent(struct device *dev, struct kobj_uevent_env *env) | |
52 | { | |
41d7a6d6 TK |
53 | /* |
54 | * Ensure that region devices always have their numa node set as | |
55 | * early as possible. | |
56 | */ | |
57 | if (is_nd_pmem(dev) || is_nd_blk(dev)) | |
58 | set_dev_node(dev, to_nd_region(dev)->numa_node); | |
4d88a97a DW |
59 | return add_uevent_var(env, "MODALIAS=" ND_DEVICE_MODALIAS_FMT, |
60 | to_nd_device_type(dev)); | |
61 | } | |
62 | ||
63 | static int nvdimm_bus_match(struct device *dev, struct device_driver *drv) | |
64 | { | |
65 | struct nd_device_driver *nd_drv = to_nd_device_driver(drv); | |
66 | ||
82ec2ba2 | 67 | return !!test_bit(to_nd_device_type(dev), &nd_drv->type); |
4d88a97a DW |
68 | } |
69 | ||
3d88002e DW |
70 | static struct module *to_bus_provider(struct device *dev) |
71 | { | |
72 | /* pin bus providers while regions are enabled */ | |
73 | if (is_nd_pmem(dev) || is_nd_blk(dev)) { | |
74 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
75 | ||
76 | return nvdimm_bus->module; | |
77 | } | |
78 | return NULL; | |
79 | } | |
80 | ||
eaf96153 DW |
81 | static void nvdimm_bus_probe_start(struct nvdimm_bus *nvdimm_bus) |
82 | { | |
83 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
84 | nvdimm_bus->probe_active++; | |
85 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
86 | } | |
87 | ||
88 | static void nvdimm_bus_probe_end(struct nvdimm_bus *nvdimm_bus) | |
89 | { | |
90 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
91 | if (--nvdimm_bus->probe_active == 0) | |
92 | wake_up(&nvdimm_bus->probe_wait); | |
93 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
94 | } | |
95 | ||
4d88a97a DW |
96 | static int nvdimm_bus_probe(struct device *dev) |
97 | { | |
98 | struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver); | |
3d88002e | 99 | struct module *provider = to_bus_provider(dev); |
4d88a97a DW |
100 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
101 | int rc; | |
102 | ||
3d88002e DW |
103 | if (!try_module_get(provider)) |
104 | return -ENXIO; | |
105 | ||
eaf96153 | 106 | nvdimm_bus_probe_start(nvdimm_bus); |
4d88a97a | 107 | rc = nd_drv->probe(dev); |
eaf96153 DW |
108 | if (rc == 0) |
109 | nd_region_probe_success(nvdimm_bus, dev); | |
bf9bccc1 DW |
110 | else |
111 | nd_region_disable(nvdimm_bus, dev); | |
eaf96153 DW |
112 | nvdimm_bus_probe_end(nvdimm_bus); |
113 | ||
4d88a97a DW |
114 | dev_dbg(&nvdimm_bus->dev, "%s.probe(%s) = %d\n", dev->driver->name, |
115 | dev_name(dev), rc); | |
8c2f7e86 | 116 | |
3d88002e DW |
117 | if (rc != 0) |
118 | module_put(provider); | |
4d88a97a DW |
119 | return rc; |
120 | } | |
121 | ||
122 | static int nvdimm_bus_remove(struct device *dev) | |
123 | { | |
124 | struct nd_device_driver *nd_drv = to_nd_device_driver(dev->driver); | |
3d88002e | 125 | struct module *provider = to_bus_provider(dev); |
4d88a97a | 126 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
6cf9c5ba | 127 | int rc = 0; |
4d88a97a | 128 | |
6cf9c5ba DW |
129 | if (nd_drv->remove) |
130 | rc = nd_drv->remove(dev); | |
eaf96153 DW |
131 | nd_region_disable(nvdimm_bus, dev); |
132 | ||
4d88a97a DW |
133 | dev_dbg(&nvdimm_bus->dev, "%s.remove(%s) = %d\n", dev->driver->name, |
134 | dev_name(dev), rc); | |
3d88002e | 135 | module_put(provider); |
4d88a97a DW |
136 | return rc; |
137 | } | |
138 | ||
71999466 DW |
139 | void nd_device_notify(struct device *dev, enum nvdimm_event event) |
140 | { | |
141 | device_lock(dev); | |
142 | if (dev->driver) { | |
143 | struct nd_device_driver *nd_drv; | |
144 | ||
145 | nd_drv = to_nd_device_driver(dev->driver); | |
146 | if (nd_drv->notify) | |
147 | nd_drv->notify(dev, event); | |
148 | } | |
149 | device_unlock(dev); | |
150 | } | |
151 | EXPORT_SYMBOL(nd_device_notify); | |
152 | ||
153 | void nvdimm_region_notify(struct nd_region *nd_region, enum nvdimm_event event) | |
154 | { | |
155 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev); | |
156 | ||
157 | if (!nvdimm_bus) | |
158 | return; | |
159 | ||
160 | /* caller is responsible for holding a reference on the device */ | |
161 | nd_device_notify(&nd_region->dev, event); | |
162 | } | |
163 | EXPORT_SYMBOL_GPL(nvdimm_region_notify); | |
164 | ||
59e64739 DW |
165 | long nvdimm_clear_poison(struct device *dev, phys_addr_t phys, |
166 | unsigned int len) | |
167 | { | |
168 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); | |
169 | struct nvdimm_bus_descriptor *nd_desc; | |
170 | struct nd_cmd_clear_error clear_err; | |
171 | struct nd_cmd_ars_cap ars_cap; | |
172 | u32 clear_err_unit, mask; | |
173 | int cmd_rc, rc; | |
174 | ||
175 | if (!nvdimm_bus) | |
176 | return -ENXIO; | |
177 | ||
178 | nd_desc = nvdimm_bus->nd_desc; | |
179 | if (!nd_desc->ndctl) | |
180 | return -ENXIO; | |
181 | ||
182 | memset(&ars_cap, 0, sizeof(ars_cap)); | |
183 | ars_cap.address = phys; | |
184 | ars_cap.length = len; | |
185 | rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_CAP, &ars_cap, | |
186 | sizeof(ars_cap), &cmd_rc); | |
187 | if (rc < 0) | |
188 | return rc; | |
189 | if (cmd_rc < 0) | |
190 | return cmd_rc; | |
191 | clear_err_unit = ars_cap.clear_err_unit; | |
192 | if (!clear_err_unit || !is_power_of_2(clear_err_unit)) | |
193 | return -ENXIO; | |
194 | ||
195 | mask = clear_err_unit - 1; | |
196 | if ((phys | len) & mask) | |
197 | return -ENXIO; | |
198 | memset(&clear_err, 0, sizeof(clear_err)); | |
199 | clear_err.address = phys; | |
200 | clear_err.length = len; | |
201 | rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_CLEAR_ERROR, &clear_err, | |
202 | sizeof(clear_err), &cmd_rc); | |
203 | if (rc < 0) | |
204 | return rc; | |
205 | if (cmd_rc < 0) | |
206 | return cmd_rc; | |
207 | return clear_err.cleared; | |
208 | } | |
209 | EXPORT_SYMBOL_GPL(nvdimm_clear_poison); | |
210 | ||
4d88a97a | 211 | static struct bus_type nvdimm_bus_type = { |
e6dfb2de | 212 | .name = "nd", |
4d88a97a DW |
213 | .uevent = nvdimm_bus_uevent, |
214 | .match = nvdimm_bus_match, | |
215 | .probe = nvdimm_bus_probe, | |
216 | .remove = nvdimm_bus_remove, | |
217 | }; | |
218 | ||
219 | static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain); | |
220 | ||
221 | void nd_synchronize(void) | |
222 | { | |
223 | async_synchronize_full_domain(&nd_async_domain); | |
224 | } | |
225 | EXPORT_SYMBOL_GPL(nd_synchronize); | |
226 | ||
227 | static void nd_async_device_register(void *d, async_cookie_t cookie) | |
228 | { | |
229 | struct device *dev = d; | |
230 | ||
231 | if (device_add(dev) != 0) { | |
232 | dev_err(dev, "%s: failed\n", __func__); | |
233 | put_device(dev); | |
234 | } | |
235 | put_device(dev); | |
236 | } | |
237 | ||
238 | static void nd_async_device_unregister(void *d, async_cookie_t cookie) | |
239 | { | |
240 | struct device *dev = d; | |
241 | ||
0ba1c634 DW |
242 | /* flush bus operations before delete */ |
243 | nvdimm_bus_lock(dev); | |
244 | nvdimm_bus_unlock(dev); | |
245 | ||
4d88a97a DW |
246 | device_unregister(dev); |
247 | put_device(dev); | |
248 | } | |
249 | ||
8c2f7e86 | 250 | void __nd_device_register(struct device *dev) |
4d88a97a | 251 | { |
cd03412a DW |
252 | if (!dev) |
253 | return; | |
4d88a97a | 254 | dev->bus = &nvdimm_bus_type; |
4d88a97a DW |
255 | get_device(dev); |
256 | async_schedule_domain(nd_async_device_register, dev, | |
257 | &nd_async_domain); | |
258 | } | |
8c2f7e86 DW |
259 | |
260 | void nd_device_register(struct device *dev) | |
261 | { | |
262 | device_initialize(dev); | |
263 | __nd_device_register(dev); | |
264 | } | |
4d88a97a DW |
265 | EXPORT_SYMBOL(nd_device_register); |
266 | ||
267 | void nd_device_unregister(struct device *dev, enum nd_async_mode mode) | |
268 | { | |
269 | switch (mode) { | |
270 | case ND_ASYNC: | |
271 | get_device(dev); | |
272 | async_schedule_domain(nd_async_device_unregister, dev, | |
273 | &nd_async_domain); | |
274 | break; | |
275 | case ND_SYNC: | |
276 | nd_synchronize(); | |
277 | device_unregister(dev); | |
278 | break; | |
279 | } | |
280 | } | |
281 | EXPORT_SYMBOL(nd_device_unregister); | |
282 | ||
283 | /** | |
284 | * __nd_driver_register() - register a region or a namespace driver | |
285 | * @nd_drv: driver to register | |
286 | * @owner: automatically set by nd_driver_register() macro | |
287 | * @mod_name: automatically set by nd_driver_register() macro | |
288 | */ | |
289 | int __nd_driver_register(struct nd_device_driver *nd_drv, struct module *owner, | |
290 | const char *mod_name) | |
291 | { | |
292 | struct device_driver *drv = &nd_drv->drv; | |
293 | ||
294 | if (!nd_drv->type) { | |
295 | pr_debug("driver type bitmask not set (%pf)\n", | |
296 | __builtin_return_address(0)); | |
297 | return -EINVAL; | |
298 | } | |
299 | ||
6cf9c5ba DW |
300 | if (!nd_drv->probe) { |
301 | pr_debug("%s ->probe() must be specified\n", mod_name); | |
4d88a97a DW |
302 | return -EINVAL; |
303 | } | |
304 | ||
305 | drv->bus = &nvdimm_bus_type; | |
306 | drv->owner = owner; | |
307 | drv->mod_name = mod_name; | |
308 | ||
309 | return driver_register(drv); | |
310 | } | |
311 | EXPORT_SYMBOL(__nd_driver_register); | |
312 | ||
58138820 DW |
313 | int nvdimm_revalidate_disk(struct gendisk *disk) |
314 | { | |
315 | struct device *dev = disk->driverfs_dev; | |
316 | struct nd_region *nd_region = to_nd_region(dev->parent); | |
317 | const char *pol = nd_region->ro ? "only" : "write"; | |
318 | ||
319 | if (nd_region->ro == get_disk_ro(disk)) | |
320 | return 0; | |
321 | ||
322 | dev_info(dev, "%s read-%s, marking %s read-%s\n", | |
323 | dev_name(&nd_region->dev), pol, disk->disk_name, pol); | |
324 | set_disk_ro(disk, nd_region->ro); | |
325 | ||
326 | return 0; | |
327 | ||
328 | } | |
329 | EXPORT_SYMBOL(nvdimm_revalidate_disk); | |
330 | ||
4d88a97a DW |
331 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, |
332 | char *buf) | |
333 | { | |
334 | return sprintf(buf, ND_DEVICE_MODALIAS_FMT "\n", | |
335 | to_nd_device_type(dev)); | |
336 | } | |
337 | static DEVICE_ATTR_RO(modalias); | |
338 | ||
339 | static ssize_t devtype_show(struct device *dev, struct device_attribute *attr, | |
340 | char *buf) | |
341 | { | |
342 | return sprintf(buf, "%s\n", dev->type->name); | |
343 | } | |
344 | static DEVICE_ATTR_RO(devtype); | |
345 | ||
346 | static struct attribute *nd_device_attributes[] = { | |
347 | &dev_attr_modalias.attr, | |
348 | &dev_attr_devtype.attr, | |
349 | NULL, | |
350 | }; | |
351 | ||
352 | /** | |
353 | * nd_device_attribute_group - generic attributes for all devices on an nd bus | |
354 | */ | |
355 | struct attribute_group nd_device_attribute_group = { | |
356 | .attrs = nd_device_attributes, | |
e6dfb2de | 357 | }; |
4d88a97a | 358 | EXPORT_SYMBOL_GPL(nd_device_attribute_group); |
e6dfb2de | 359 | |
74ae66c3 TK |
360 | static ssize_t numa_node_show(struct device *dev, |
361 | struct device_attribute *attr, char *buf) | |
362 | { | |
363 | return sprintf(buf, "%d\n", dev_to_node(dev)); | |
364 | } | |
365 | static DEVICE_ATTR_RO(numa_node); | |
366 | ||
367 | static struct attribute *nd_numa_attributes[] = { | |
368 | &dev_attr_numa_node.attr, | |
369 | NULL, | |
370 | }; | |
371 | ||
372 | static umode_t nd_numa_attr_visible(struct kobject *kobj, struct attribute *a, | |
373 | int n) | |
374 | { | |
375 | if (!IS_ENABLED(CONFIG_NUMA)) | |
376 | return 0; | |
377 | ||
378 | return a->mode; | |
379 | } | |
380 | ||
381 | /** | |
382 | * nd_numa_attribute_group - NUMA attributes for all devices on an nd bus | |
383 | */ | |
384 | struct attribute_group nd_numa_attribute_group = { | |
385 | .attrs = nd_numa_attributes, | |
386 | .is_visible = nd_numa_attr_visible, | |
387 | }; | |
388 | EXPORT_SYMBOL_GPL(nd_numa_attribute_group); | |
389 | ||
45def22c DW |
390 | int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus) |
391 | { | |
392 | dev_t devt = MKDEV(nvdimm_bus_major, nvdimm_bus->id); | |
393 | struct device *dev; | |
394 | ||
395 | dev = device_create(nd_class, &nvdimm_bus->dev, devt, nvdimm_bus, | |
396 | "ndctl%d", nvdimm_bus->id); | |
397 | ||
398 | if (IS_ERR(dev)) { | |
399 | dev_dbg(&nvdimm_bus->dev, "failed to register ndctl%d: %ld\n", | |
400 | nvdimm_bus->id, PTR_ERR(dev)); | |
401 | return PTR_ERR(dev); | |
402 | } | |
403 | return 0; | |
404 | } | |
405 | ||
406 | void nvdimm_bus_destroy_ndctl(struct nvdimm_bus *nvdimm_bus) | |
407 | { | |
408 | device_destroy(nd_class, MKDEV(nvdimm_bus_major, nvdimm_bus->id)); | |
409 | } | |
410 | ||
62232e45 DW |
411 | static const struct nd_cmd_desc __nd_cmd_dimm_descs[] = { |
412 | [ND_CMD_IMPLEMENTED] = { }, | |
413 | [ND_CMD_SMART] = { | |
414 | .out_num = 2, | |
21129112 | 415 | .out_sizes = { 4, 128, }, |
62232e45 DW |
416 | }, |
417 | [ND_CMD_SMART_THRESHOLD] = { | |
418 | .out_num = 2, | |
419 | .out_sizes = { 4, 8, }, | |
420 | }, | |
421 | [ND_CMD_DIMM_FLAGS] = { | |
422 | .out_num = 2, | |
423 | .out_sizes = { 4, 4 }, | |
424 | }, | |
425 | [ND_CMD_GET_CONFIG_SIZE] = { | |
426 | .out_num = 3, | |
427 | .out_sizes = { 4, 4, 4, }, | |
428 | }, | |
429 | [ND_CMD_GET_CONFIG_DATA] = { | |
430 | .in_num = 2, | |
431 | .in_sizes = { 4, 4, }, | |
432 | .out_num = 2, | |
433 | .out_sizes = { 4, UINT_MAX, }, | |
434 | }, | |
435 | [ND_CMD_SET_CONFIG_DATA] = { | |
436 | .in_num = 3, | |
437 | .in_sizes = { 4, 4, UINT_MAX, }, | |
438 | .out_num = 1, | |
439 | .out_sizes = { 4, }, | |
440 | }, | |
441 | [ND_CMD_VENDOR] = { | |
442 | .in_num = 3, | |
443 | .in_sizes = { 4, 4, UINT_MAX, }, | |
444 | .out_num = 3, | |
445 | .out_sizes = { 4, 4, UINT_MAX, }, | |
446 | }, | |
447 | }; | |
448 | ||
449 | const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd) | |
450 | { | |
451 | if (cmd < ARRAY_SIZE(__nd_cmd_dimm_descs)) | |
452 | return &__nd_cmd_dimm_descs[cmd]; | |
453 | return NULL; | |
454 | } | |
455 | EXPORT_SYMBOL_GPL(nd_cmd_dimm_desc); | |
456 | ||
457 | static const struct nd_cmd_desc __nd_cmd_bus_descs[] = { | |
458 | [ND_CMD_IMPLEMENTED] = { }, | |
459 | [ND_CMD_ARS_CAP] = { | |
460 | .in_num = 2, | |
461 | .in_sizes = { 8, 8, }, | |
4577b066 DW |
462 | .out_num = 4, |
463 | .out_sizes = { 4, 4, 4, 4, }, | |
62232e45 DW |
464 | }, |
465 | [ND_CMD_ARS_START] = { | |
4577b066 DW |
466 | .in_num = 5, |
467 | .in_sizes = { 8, 8, 2, 1, 5, }, | |
468 | .out_num = 2, | |
469 | .out_sizes = { 4, 4, }, | |
62232e45 DW |
470 | }, |
471 | [ND_CMD_ARS_STATUS] = { | |
747ffe11 DW |
472 | .out_num = 3, |
473 | .out_sizes = { 4, 4, UINT_MAX, }, | |
62232e45 | 474 | }, |
d4f32367 DW |
475 | [ND_CMD_CLEAR_ERROR] = { |
476 | .in_num = 2, | |
477 | .in_sizes = { 8, 8, }, | |
478 | .out_num = 3, | |
479 | .out_sizes = { 4, 4, 8, }, | |
480 | }, | |
62232e45 DW |
481 | }; |
482 | ||
483 | const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd) | |
484 | { | |
485 | if (cmd < ARRAY_SIZE(__nd_cmd_bus_descs)) | |
486 | return &__nd_cmd_bus_descs[cmd]; | |
487 | return NULL; | |
488 | } | |
489 | EXPORT_SYMBOL_GPL(nd_cmd_bus_desc); | |
490 | ||
491 | u32 nd_cmd_in_size(struct nvdimm *nvdimm, int cmd, | |
492 | const struct nd_cmd_desc *desc, int idx, void *buf) | |
493 | { | |
494 | if (idx >= desc->in_num) | |
495 | return UINT_MAX; | |
496 | ||
497 | if (desc->in_sizes[idx] < UINT_MAX) | |
498 | return desc->in_sizes[idx]; | |
499 | ||
500 | if (nvdimm && cmd == ND_CMD_SET_CONFIG_DATA && idx == 2) { | |
501 | struct nd_cmd_set_config_hdr *hdr = buf; | |
502 | ||
503 | return hdr->in_length; | |
504 | } else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) { | |
505 | struct nd_cmd_vendor_hdr *hdr = buf; | |
506 | ||
507 | return hdr->in_length; | |
508 | } | |
509 | ||
510 | return UINT_MAX; | |
511 | } | |
512 | EXPORT_SYMBOL_GPL(nd_cmd_in_size); | |
513 | ||
514 | u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd, | |
515 | const struct nd_cmd_desc *desc, int idx, const u32 *in_field, | |
516 | const u32 *out_field) | |
517 | { | |
518 | if (idx >= desc->out_num) | |
519 | return UINT_MAX; | |
520 | ||
521 | if (desc->out_sizes[idx] < UINT_MAX) | |
522 | return desc->out_sizes[idx]; | |
523 | ||
524 | if (nvdimm && cmd == ND_CMD_GET_CONFIG_DATA && idx == 1) | |
525 | return in_field[1]; | |
526 | else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2) | |
527 | return out_field[1]; | |
747ffe11 DW |
528 | else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 2) |
529 | return out_field[1] - 8; | |
62232e45 DW |
530 | |
531 | return UINT_MAX; | |
532 | } | |
533 | EXPORT_SYMBOL_GPL(nd_cmd_out_size); | |
534 | ||
bf9bccc1 | 535 | void wait_nvdimm_bus_probe_idle(struct device *dev) |
eaf96153 | 536 | { |
bf9bccc1 DW |
537 | struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev); |
538 | ||
eaf96153 DW |
539 | do { |
540 | if (nvdimm_bus->probe_active == 0) | |
541 | break; | |
542 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
543 | wait_event(nvdimm_bus->probe_wait, | |
544 | nvdimm_bus->probe_active == 0); | |
545 | nvdimm_bus_lock(&nvdimm_bus->dev); | |
546 | } while (true); | |
547 | } | |
548 | ||
d4f32367 DW |
549 | static int pmem_active(struct device *dev, void *data) |
550 | { | |
551 | if (is_nd_pmem(dev) && dev->driver) | |
552 | return -EBUSY; | |
553 | return 0; | |
554 | } | |
555 | ||
eaf96153 | 556 | /* set_config requires an idle interleave set */ |
87bf572e DW |
557 | static int nd_cmd_clear_to_send(struct nvdimm_bus *nvdimm_bus, |
558 | struct nvdimm *nvdimm, unsigned int cmd) | |
eaf96153 | 559 | { |
87bf572e DW |
560 | struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; |
561 | ||
562 | /* ask the bus provider if it would like to block this request */ | |
563 | if (nd_desc->clear_to_send) { | |
564 | int rc = nd_desc->clear_to_send(nd_desc, nvdimm, cmd); | |
565 | ||
566 | if (rc) | |
567 | return rc; | |
568 | } | |
eaf96153 | 569 | |
d4f32367 DW |
570 | /* require clear error to go through the pmem driver */ |
571 | if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR) | |
572 | return device_for_each_child(&nvdimm_bus->dev, NULL, | |
573 | pmem_active); | |
574 | ||
eaf96153 DW |
575 | if (!nvdimm || cmd != ND_CMD_SET_CONFIG_DATA) |
576 | return 0; | |
577 | ||
87bf572e | 578 | /* prevent label manipulation while the kernel owns label updates */ |
bf9bccc1 | 579 | wait_nvdimm_bus_probe_idle(&nvdimm_bus->dev); |
eaf96153 DW |
580 | if (atomic_read(&nvdimm->busy)) |
581 | return -EBUSY; | |
582 | return 0; | |
583 | } | |
584 | ||
62232e45 DW |
585 | static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm, |
586 | int read_only, unsigned int ioctl_cmd, unsigned long arg) | |
587 | { | |
588 | struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; | |
589 | size_t buf_len = 0, in_len = 0, out_len = 0; | |
590 | static char out_env[ND_CMD_MAX_ENVELOPE]; | |
591 | static char in_env[ND_CMD_MAX_ENVELOPE]; | |
592 | const struct nd_cmd_desc *desc = NULL; | |
593 | unsigned int cmd = _IOC_NR(ioctl_cmd); | |
594 | void __user *p = (void __user *) arg; | |
595 | struct device *dev = &nvdimm_bus->dev; | |
596 | const char *cmd_name, *dimm_name; | |
597 | unsigned long dsm_mask; | |
598 | void *buf; | |
599 | int rc, i; | |
600 | ||
601 | if (nvdimm) { | |
602 | desc = nd_cmd_dimm_desc(cmd); | |
603 | cmd_name = nvdimm_cmd_name(cmd); | |
604 | dsm_mask = nvdimm->dsm_mask ? *(nvdimm->dsm_mask) : 0; | |
605 | dimm_name = dev_name(&nvdimm->dev); | |
606 | } else { | |
607 | desc = nd_cmd_bus_desc(cmd); | |
608 | cmd_name = nvdimm_bus_cmd_name(cmd); | |
609 | dsm_mask = nd_desc->dsm_mask; | |
610 | dimm_name = "bus"; | |
611 | } | |
612 | ||
613 | if (!desc || (desc->out_num + desc->in_num == 0) || | |
614 | !test_bit(cmd, &dsm_mask)) | |
615 | return -ENOTTY; | |
616 | ||
617 | /* fail write commands (when read-only) */ | |
618 | if (read_only) | |
07accfa9 JH |
619 | switch (cmd) { |
620 | case ND_CMD_VENDOR: | |
621 | case ND_CMD_SET_CONFIG_DATA: | |
622 | case ND_CMD_ARS_START: | |
d4f32367 | 623 | case ND_CMD_CLEAR_ERROR: |
62232e45 DW |
624 | dev_dbg(&nvdimm_bus->dev, "'%s' command while read-only.\n", |
625 | nvdimm ? nvdimm_cmd_name(cmd) | |
626 | : nvdimm_bus_cmd_name(cmd)); | |
627 | return -EPERM; | |
628 | default: | |
629 | break; | |
630 | } | |
631 | ||
632 | /* process an input envelope */ | |
633 | for (i = 0; i < desc->in_num; i++) { | |
634 | u32 in_size, copy; | |
635 | ||
636 | in_size = nd_cmd_in_size(nvdimm, cmd, desc, i, in_env); | |
637 | if (in_size == UINT_MAX) { | |
638 | dev_err(dev, "%s:%s unknown input size cmd: %s field: %d\n", | |
639 | __func__, dimm_name, cmd_name, i); | |
640 | return -ENXIO; | |
641 | } | |
62232e45 DW |
642 | if (in_len < sizeof(in_env)) |
643 | copy = min_t(u32, sizeof(in_env) - in_len, in_size); | |
644 | else | |
645 | copy = 0; | |
646 | if (copy && copy_from_user(&in_env[in_len], p + in_len, copy)) | |
647 | return -EFAULT; | |
648 | in_len += in_size; | |
649 | } | |
650 | ||
651 | /* process an output envelope */ | |
652 | for (i = 0; i < desc->out_num; i++) { | |
653 | u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i, | |
654 | (u32 *) in_env, (u32 *) out_env); | |
655 | u32 copy; | |
656 | ||
657 | if (out_size == UINT_MAX) { | |
658 | dev_dbg(dev, "%s:%s unknown output size cmd: %s field: %d\n", | |
659 | __func__, dimm_name, cmd_name, i); | |
660 | return -EFAULT; | |
661 | } | |
62232e45 DW |
662 | if (out_len < sizeof(out_env)) |
663 | copy = min_t(u32, sizeof(out_env) - out_len, out_size); | |
664 | else | |
665 | copy = 0; | |
666 | if (copy && copy_from_user(&out_env[out_len], | |
667 | p + in_len + out_len, copy)) | |
668 | return -EFAULT; | |
669 | out_len += out_size; | |
670 | } | |
671 | ||
672 | buf_len = out_len + in_len; | |
62232e45 DW |
673 | if (buf_len > ND_IOCTL_MAX_BUFLEN) { |
674 | dev_dbg(dev, "%s:%s cmd: %s buf_len: %zu > %d\n", __func__, | |
675 | dimm_name, cmd_name, buf_len, | |
676 | ND_IOCTL_MAX_BUFLEN); | |
677 | return -EINVAL; | |
678 | } | |
679 | ||
680 | buf = vmalloc(buf_len); | |
681 | if (!buf) | |
682 | return -ENOMEM; | |
683 | ||
684 | if (copy_from_user(buf, p, buf_len)) { | |
685 | rc = -EFAULT; | |
686 | goto out; | |
687 | } | |
688 | ||
eaf96153 | 689 | nvdimm_bus_lock(&nvdimm_bus->dev); |
87bf572e | 690 | rc = nd_cmd_clear_to_send(nvdimm_bus, nvdimm, cmd); |
eaf96153 DW |
691 | if (rc) |
692 | goto out_unlock; | |
693 | ||
aef25338 | 694 | rc = nd_desc->ndctl(nd_desc, nvdimm, cmd, buf, buf_len, NULL); |
62232e45 | 695 | if (rc < 0) |
eaf96153 | 696 | goto out_unlock; |
62232e45 DW |
697 | if (copy_to_user(p, buf, buf_len)) |
698 | rc = -EFAULT; | |
eaf96153 DW |
699 | out_unlock: |
700 | nvdimm_bus_unlock(&nvdimm_bus->dev); | |
62232e45 DW |
701 | out: |
702 | vfree(buf); | |
703 | return rc; | |
704 | } | |
705 | ||
45def22c DW |
706 | static long nd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
707 | { | |
62232e45 | 708 | long id = (long) file->private_data; |
4dc0e7be | 709 | int rc = -ENXIO, ro; |
62232e45 DW |
710 | struct nvdimm_bus *nvdimm_bus; |
711 | ||
4dc0e7be | 712 | ro = ((file->f_flags & O_ACCMODE) == O_RDONLY); |
62232e45 DW |
713 | mutex_lock(&nvdimm_bus_list_mutex); |
714 | list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) { | |
715 | if (nvdimm_bus->id == id) { | |
4dc0e7be | 716 | rc = __nd_ioctl(nvdimm_bus, NULL, ro, cmd, arg); |
62232e45 DW |
717 | break; |
718 | } | |
719 | } | |
720 | mutex_unlock(&nvdimm_bus_list_mutex); | |
721 | ||
722 | return rc; | |
723 | } | |
724 | ||
725 | static int match_dimm(struct device *dev, void *data) | |
726 | { | |
727 | long id = (long) data; | |
728 | ||
729 | if (is_nvdimm(dev)) { | |
730 | struct nvdimm *nvdimm = to_nvdimm(dev); | |
731 | ||
732 | return nvdimm->id == id; | |
733 | } | |
734 | ||
735 | return 0; | |
736 | } | |
737 | ||
738 | static long nvdimm_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
739 | { | |
4dc0e7be | 740 | int rc = -ENXIO, ro; |
62232e45 DW |
741 | struct nvdimm_bus *nvdimm_bus; |
742 | ||
4dc0e7be | 743 | ro = ((file->f_flags & O_ACCMODE) == O_RDONLY); |
62232e45 DW |
744 | mutex_lock(&nvdimm_bus_list_mutex); |
745 | list_for_each_entry(nvdimm_bus, &nvdimm_bus_list, list) { | |
746 | struct device *dev = device_find_child(&nvdimm_bus->dev, | |
747 | file->private_data, match_dimm); | |
748 | struct nvdimm *nvdimm; | |
749 | ||
750 | if (!dev) | |
751 | continue; | |
752 | ||
753 | nvdimm = to_nvdimm(dev); | |
4dc0e7be | 754 | rc = __nd_ioctl(nvdimm_bus, nvdimm, ro, cmd, arg); |
62232e45 DW |
755 | put_device(dev); |
756 | break; | |
757 | } | |
758 | mutex_unlock(&nvdimm_bus_list_mutex); | |
759 | ||
760 | return rc; | |
761 | } | |
762 | ||
763 | static int nd_open(struct inode *inode, struct file *file) | |
764 | { | |
765 | long minor = iminor(inode); | |
766 | ||
767 | file->private_data = (void *) minor; | |
768 | return 0; | |
45def22c DW |
769 | } |
770 | ||
771 | static const struct file_operations nvdimm_bus_fops = { | |
772 | .owner = THIS_MODULE, | |
62232e45 | 773 | .open = nd_open, |
45def22c DW |
774 | .unlocked_ioctl = nd_ioctl, |
775 | .compat_ioctl = nd_ioctl, | |
776 | .llseek = noop_llseek, | |
777 | }; | |
778 | ||
62232e45 DW |
779 | static const struct file_operations nvdimm_fops = { |
780 | .owner = THIS_MODULE, | |
781 | .open = nd_open, | |
782 | .unlocked_ioctl = nvdimm_ioctl, | |
783 | .compat_ioctl = nvdimm_ioctl, | |
784 | .llseek = noop_llseek, | |
785 | }; | |
786 | ||
45def22c DW |
787 | int __init nvdimm_bus_init(void) |
788 | { | |
789 | int rc; | |
790 | ||
e6dfb2de DW |
791 | rc = bus_register(&nvdimm_bus_type); |
792 | if (rc) | |
793 | return rc; | |
794 | ||
45def22c DW |
795 | rc = register_chrdev(0, "ndctl", &nvdimm_bus_fops); |
796 | if (rc < 0) | |
62232e45 | 797 | goto err_bus_chrdev; |
45def22c DW |
798 | nvdimm_bus_major = rc; |
799 | ||
62232e45 DW |
800 | rc = register_chrdev(0, "dimmctl", &nvdimm_fops); |
801 | if (rc < 0) | |
802 | goto err_dimm_chrdev; | |
803 | nvdimm_major = rc; | |
804 | ||
45def22c | 805 | nd_class = class_create(THIS_MODULE, "nd"); |
daa1dee4 AL |
806 | if (IS_ERR(nd_class)) { |
807 | rc = PTR_ERR(nd_class); | |
45def22c | 808 | goto err_class; |
daa1dee4 | 809 | } |
45def22c DW |
810 | |
811 | return 0; | |
812 | ||
813 | err_class: | |
62232e45 DW |
814 | unregister_chrdev(nvdimm_major, "dimmctl"); |
815 | err_dimm_chrdev: | |
45def22c | 816 | unregister_chrdev(nvdimm_bus_major, "ndctl"); |
62232e45 | 817 | err_bus_chrdev: |
e6dfb2de | 818 | bus_unregister(&nvdimm_bus_type); |
45def22c DW |
819 | |
820 | return rc; | |
821 | } | |
822 | ||
4d88a97a | 823 | void nvdimm_bus_exit(void) |
45def22c DW |
824 | { |
825 | class_destroy(nd_class); | |
826 | unregister_chrdev(nvdimm_bus_major, "ndctl"); | |
62232e45 | 827 | unregister_chrdev(nvdimm_major, "dimmctl"); |
e6dfb2de | 828 | bus_unregister(&nvdimm_bus_type); |
45def22c | 829 | } |