Commit | Line | Data |
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9e853f23 RZ |
1 | /* |
2 | * Persistent Memory Driver | |
3 | * | |
9f53f9fa | 4 | * Copyright (c) 2014-2015, Intel Corporation. |
9e853f23 RZ |
5 | * Copyright (c) 2015, Christoph Hellwig <hch@lst.de>. |
6 | * Copyright (c) 2015, Boaz Harrosh <boaz@plexistor.com>. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms and conditions of the GNU General Public License, | |
10 | * version 2, as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope it will be useful, but WITHOUT | |
13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
15 | * more details. | |
16 | */ | |
17 | ||
18 | #include <asm/cacheflush.h> | |
19 | #include <linux/blkdev.h> | |
20 | #include <linux/hdreg.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/platform_device.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/moduleparam.h> | |
b95f5f43 | 25 | #include <linux/badblocks.h> |
9476df7d | 26 | #include <linux/memremap.h> |
32ab0a3f | 27 | #include <linux/vmalloc.h> |
71389703 | 28 | #include <linux/blk-mq.h> |
34c0fd54 | 29 | #include <linux/pfn_t.h> |
9e853f23 | 30 | #include <linux/slab.h> |
61031952 | 31 | #include <linux/pmem.h> |
c1d6e828 | 32 | #include <linux/dax.h> |
9f53f9fa | 33 | #include <linux/nd.h> |
f295e53b | 34 | #include "pmem.h" |
32ab0a3f | 35 | #include "pfn.h" |
9f53f9fa | 36 | #include "nd.h" |
9e853f23 | 37 | |
f284a4f2 DW |
38 | static struct device *to_dev(struct pmem_device *pmem) |
39 | { | |
40 | /* | |
41 | * nvdimm bus services need a 'dev' parameter, and we record the device | |
42 | * at init in bb.dev. | |
43 | */ | |
44 | return pmem->bb.dev; | |
45 | } | |
46 | ||
47 | static struct nd_region *to_region(struct pmem_device *pmem) | |
48 | { | |
49 | return to_nd_region(to_dev(pmem)->parent); | |
50 | } | |
9e853f23 | 51 | |
3115bb02 | 52 | static int pmem_clear_poison(struct pmem_device *pmem, phys_addr_t offset, |
59e64739 DW |
53 | unsigned int len) |
54 | { | |
f284a4f2 | 55 | struct device *dev = to_dev(pmem); |
59e64739 DW |
56 | sector_t sector; |
57 | long cleared; | |
868f036f | 58 | int rc = 0; |
59e64739 DW |
59 | |
60 | sector = (offset - pmem->data_offset) / 512; | |
59e64739 | 61 | |
868f036f DW |
62 | cleared = nvdimm_clear_poison(dev, pmem->phys_addr + offset, len); |
63 | if (cleared < len) | |
64 | rc = -EIO; | |
59e64739 | 65 | if (cleared > 0 && cleared / 512) { |
868f036f DW |
66 | cleared /= 512; |
67 | dev_dbg(dev, "%s: %#llx clear %ld sector%s\n", __func__, | |
68 | (unsigned long long) sector, cleared, | |
69 | cleared > 1 ? "s" : ""); | |
0a3f27b9 | 70 | badblocks_clear(&pmem->bb, sector, cleared); |
59e64739 | 71 | } |
3115bb02 | 72 | |
59e64739 | 73 | invalidate_pmem(pmem->virt_addr + offset, len); |
868f036f DW |
74 | |
75 | return rc; | |
59e64739 DW |
76 | } |
77 | ||
bd697a80 VV |
78 | static void write_pmem(void *pmem_addr, struct page *page, |
79 | unsigned int off, unsigned int len) | |
80 | { | |
81 | void *mem = kmap_atomic(page); | |
82 | ||
83 | memcpy_to_pmem(pmem_addr, mem + off, len); | |
84 | kunmap_atomic(mem); | |
85 | } | |
86 | ||
87 | static int read_pmem(struct page *page, unsigned int off, | |
88 | void *pmem_addr, unsigned int len) | |
89 | { | |
90 | int rc; | |
91 | void *mem = kmap_atomic(page); | |
92 | ||
6abccd1b | 93 | rc = memcpy_mcsafe(mem + off, pmem_addr, len); |
bd697a80 | 94 | kunmap_atomic(mem); |
d47d1d27 SH |
95 | if (rc) |
96 | return -EIO; | |
97 | return 0; | |
bd697a80 VV |
98 | } |
99 | ||
e10624f8 | 100 | static int pmem_do_bvec(struct pmem_device *pmem, struct page *page, |
c11f0c0b | 101 | unsigned int len, unsigned int off, bool is_write, |
9e853f23 RZ |
102 | sector_t sector) |
103 | { | |
b5ebc8ec | 104 | int rc = 0; |
59e64739 | 105 | bool bad_pmem = false; |
32ab0a3f | 106 | phys_addr_t pmem_off = sector * 512 + pmem->data_offset; |
7a9eb206 | 107 | void *pmem_addr = pmem->virt_addr + pmem_off; |
9e853f23 | 108 | |
59e64739 DW |
109 | if (unlikely(is_bad_pmem(&pmem->bb, sector, len))) |
110 | bad_pmem = true; | |
111 | ||
c11f0c0b | 112 | if (!is_write) { |
59e64739 | 113 | if (unlikely(bad_pmem)) |
b5ebc8ec DW |
114 | rc = -EIO; |
115 | else { | |
bd697a80 | 116 | rc = read_pmem(page, off, pmem_addr, len); |
b5ebc8ec DW |
117 | flush_dcache_page(page); |
118 | } | |
9e853f23 | 119 | } else { |
0a370d26 DW |
120 | /* |
121 | * Note that we write the data both before and after | |
122 | * clearing poison. The write before clear poison | |
123 | * handles situations where the latest written data is | |
124 | * preserved and the clear poison operation simply marks | |
125 | * the address range as valid without changing the data. | |
126 | * In this case application software can assume that an | |
127 | * interrupted write will either return the new good | |
128 | * data or an error. | |
129 | * | |
130 | * However, if pmem_clear_poison() leaves the data in an | |
131 | * indeterminate state we need to perform the write | |
132 | * after clear poison. | |
133 | */ | |
9e853f23 | 134 | flush_dcache_page(page); |
bd697a80 | 135 | write_pmem(pmem_addr, page, off, len); |
59e64739 | 136 | if (unlikely(bad_pmem)) { |
3115bb02 | 137 | rc = pmem_clear_poison(pmem, pmem_off, len); |
bd697a80 | 138 | write_pmem(pmem_addr, page, off, len); |
59e64739 | 139 | } |
9e853f23 RZ |
140 | } |
141 | ||
b5ebc8ec | 142 | return rc; |
9e853f23 RZ |
143 | } |
144 | ||
7e267a8c DW |
145 | /* account for REQ_FLUSH rename, replace with REQ_PREFLUSH after v4.8-rc1 */ |
146 | #ifndef REQ_FLUSH | |
147 | #define REQ_FLUSH REQ_PREFLUSH | |
148 | #endif | |
149 | ||
dece1635 | 150 | static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio) |
9e853f23 | 151 | { |
e10624f8 | 152 | int rc = 0; |
f0dc089c DW |
153 | bool do_acct; |
154 | unsigned long start; | |
9e853f23 | 155 | struct bio_vec bvec; |
9e853f23 | 156 | struct bvec_iter iter; |
bd842b8c | 157 | struct pmem_device *pmem = q->queuedata; |
7e267a8c DW |
158 | struct nd_region *nd_region = to_region(pmem); |
159 | ||
1eff9d32 | 160 | if (bio->bi_opf & REQ_FLUSH) |
7e267a8c | 161 | nvdimm_flush(nd_region); |
9e853f23 | 162 | |
f0dc089c | 163 | do_acct = nd_iostat_start(bio, &start); |
e10624f8 DW |
164 | bio_for_each_segment(bvec, bio, iter) { |
165 | rc = pmem_do_bvec(pmem, bvec.bv_page, bvec.bv_len, | |
c11f0c0b | 166 | bvec.bv_offset, op_is_write(bio_op(bio)), |
e10624f8 DW |
167 | iter.bi_sector); |
168 | if (rc) { | |
169 | bio->bi_error = rc; | |
170 | break; | |
171 | } | |
172 | } | |
f0dc089c DW |
173 | if (do_acct) |
174 | nd_iostat_end(bio, start); | |
61031952 | 175 | |
1eff9d32 | 176 | if (bio->bi_opf & REQ_FUA) |
7e267a8c | 177 | nvdimm_flush(nd_region); |
61031952 | 178 | |
4246a0b6 | 179 | bio_endio(bio); |
dece1635 | 180 | return BLK_QC_T_NONE; |
9e853f23 RZ |
181 | } |
182 | ||
183 | static int pmem_rw_page(struct block_device *bdev, sector_t sector, | |
c11f0c0b | 184 | struct page *page, bool is_write) |
9e853f23 | 185 | { |
bd842b8c | 186 | struct pmem_device *pmem = bdev->bd_queue->queuedata; |
e10624f8 | 187 | int rc; |
9e853f23 | 188 | |
c11f0c0b | 189 | rc = pmem_do_bvec(pmem, page, PAGE_SIZE, 0, is_write, sector); |
9e853f23 | 190 | |
e10624f8 DW |
191 | /* |
192 | * The ->rw_page interface is subtle and tricky. The core | |
193 | * retries on any error, so we can only invoke page_endio() in | |
194 | * the successful completion case. Otherwise, we'll see crashes | |
195 | * caused by double completion. | |
196 | */ | |
197 | if (rc == 0) | |
c11f0c0b | 198 | page_endio(page, is_write, 0); |
e10624f8 DW |
199 | |
200 | return rc; | |
9e853f23 RZ |
201 | } |
202 | ||
f295e53b | 203 | /* see "strong" declaration in tools/testing/nvdimm/pmem-dax.c */ |
c1d6e828 DW |
204 | __weak long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff, |
205 | long nr_pages, void **kaddr, pfn_t *pfn) | |
9e853f23 | 206 | { |
c1d6e828 | 207 | resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset; |
589e75d1 | 208 | |
c1d6e828 DW |
209 | if (unlikely(is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512, |
210 | PFN_PHYS(nr_pages)))) | |
0a70bd43 | 211 | return -EIO; |
e2e05394 | 212 | *kaddr = pmem->virt_addr + offset; |
34c0fd54 | 213 | *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags); |
9e853f23 | 214 | |
0a70bd43 DW |
215 | /* |
216 | * If badblocks are present, limit known good range to the | |
217 | * requested range. | |
218 | */ | |
219 | if (unlikely(pmem->bb.count)) | |
c1d6e828 DW |
220 | return nr_pages; |
221 | return PHYS_PFN(pmem->size - pmem->pfn_pad - offset); | |
9e853f23 RZ |
222 | } |
223 | ||
224 | static const struct block_device_operations pmem_fops = { | |
225 | .owner = THIS_MODULE, | |
226 | .rw_page = pmem_rw_page, | |
58138820 | 227 | .revalidate_disk = nvdimm_revalidate_disk, |
9e853f23 RZ |
228 | }; |
229 | ||
c1d6e828 DW |
230 | static long pmem_dax_direct_access(struct dax_device *dax_dev, |
231 | pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn) | |
232 | { | |
233 | struct pmem_device *pmem = dax_get_private(dax_dev); | |
234 | ||
235 | return __pmem_direct_access(pmem, pgoff, nr_pages, kaddr, pfn); | |
236 | } | |
237 | ||
238 | static const struct dax_operations pmem_dax_ops = { | |
239 | .direct_access = pmem_dax_direct_access, | |
240 | }; | |
241 | ||
030b99e3 DW |
242 | static void pmem_release_queue(void *q) |
243 | { | |
244 | blk_cleanup_queue(q); | |
245 | } | |
246 | ||
71389703 DW |
247 | static void pmem_freeze_queue(void *q) |
248 | { | |
d3b5d352 | 249 | blk_freeze_queue_start(q); |
71389703 DW |
250 | } |
251 | ||
c1d6e828 | 252 | static void pmem_release_disk(void *__pmem) |
030b99e3 | 253 | { |
c1d6e828 DW |
254 | struct pmem_device *pmem = __pmem; |
255 | ||
256 | kill_dax(pmem->dax_dev); | |
257 | put_dax(pmem->dax_dev); | |
258 | del_gendisk(pmem->disk); | |
259 | put_disk(pmem->disk); | |
030b99e3 DW |
260 | } |
261 | ||
200c79da DW |
262 | static int pmem_attach_disk(struct device *dev, |
263 | struct nd_namespace_common *ndns) | |
9e853f23 | 264 | { |
200c79da | 265 | struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); |
f284a4f2 | 266 | struct nd_region *nd_region = to_nd_region(dev->parent); |
200c79da DW |
267 | struct vmem_altmap __altmap, *altmap = NULL; |
268 | struct resource *res = &nsio->res; | |
269 | struct nd_pfn *nd_pfn = NULL; | |
c1d6e828 | 270 | struct dax_device *dax_dev; |
200c79da DW |
271 | int nid = dev_to_node(dev); |
272 | struct nd_pfn_sb *pfn_sb; | |
9e853f23 | 273 | struct pmem_device *pmem; |
200c79da | 274 | struct resource pfn_res; |
468ded03 | 275 | struct request_queue *q; |
200c79da DW |
276 | struct gendisk *disk; |
277 | void *addr; | |
278 | ||
279 | /* while nsio_rw_bytes is active, parse a pfn info block if present */ | |
280 | if (is_nd_pfn(dev)) { | |
281 | nd_pfn = to_nd_pfn(dev); | |
282 | altmap = nvdimm_setup_pfn(nd_pfn, &pfn_res, &__altmap); | |
283 | if (IS_ERR(altmap)) | |
284 | return PTR_ERR(altmap); | |
285 | } | |
286 | ||
287 | /* we're attaching a block device, disable raw namespace access */ | |
288 | devm_nsio_disable(dev, nsio); | |
9e853f23 | 289 | |
708ab62b | 290 | pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL); |
9e853f23 | 291 | if (!pmem) |
200c79da | 292 | return -ENOMEM; |
9e853f23 | 293 | |
200c79da | 294 | dev_set_drvdata(dev, pmem); |
9e853f23 RZ |
295 | pmem->phys_addr = res->start; |
296 | pmem->size = resource_size(res); | |
f284a4f2 | 297 | if (nvdimm_has_flush(nd_region) < 0) |
61031952 | 298 | dev_warn(dev, "unable to guarantee persistence of writes\n"); |
9e853f23 | 299 | |
947df02d | 300 | if (!devm_request_mem_region(dev, res->start, resource_size(res), |
450c6633 | 301 | dev_name(&ndns->dev))) { |
947df02d | 302 | dev_warn(dev, "could not reserve region %pR\n", res); |
200c79da | 303 | return -EBUSY; |
9e853f23 RZ |
304 | } |
305 | ||
468ded03 DW |
306 | q = blk_alloc_queue_node(GFP_KERNEL, dev_to_node(dev)); |
307 | if (!q) | |
200c79da | 308 | return -ENOMEM; |
468ded03 | 309 | |
71389703 DW |
310 | if (devm_add_action_or_reset(dev, pmem_release_queue, q)) |
311 | return -ENOMEM; | |
312 | ||
34c0fd54 | 313 | pmem->pfn_flags = PFN_DEV; |
200c79da DW |
314 | if (is_nd_pfn(dev)) { |
315 | addr = devm_memremap_pages(dev, &pfn_res, &q->q_usage_counter, | |
316 | altmap); | |
317 | pfn_sb = nd_pfn->pfn_sb; | |
318 | pmem->data_offset = le64_to_cpu(pfn_sb->dataoff); | |
319 | pmem->pfn_pad = resource_size(res) - resource_size(&pfn_res); | |
320 | pmem->pfn_flags |= PFN_MAP; | |
321 | res = &pfn_res; /* for badblocks populate */ | |
322 | res->start += pmem->data_offset; | |
323 | } else if (pmem_should_map_pages(dev)) { | |
324 | addr = devm_memremap_pages(dev, &nsio->res, | |
5c2c2587 | 325 | &q->q_usage_counter, NULL); |
34c0fd54 DW |
326 | pmem->pfn_flags |= PFN_MAP; |
327 | } else | |
200c79da DW |
328 | addr = devm_memremap(dev, pmem->phys_addr, |
329 | pmem->size, ARCH_MEMREMAP_PMEM); | |
b36f4761 | 330 | |
030b99e3 | 331 | /* |
71389703 | 332 | * At release time the queue must be frozen before |
030b99e3 DW |
333 | * devm_memremap_pages is unwound |
334 | */ | |
71389703 | 335 | if (devm_add_action_or_reset(dev, pmem_freeze_queue, q)) |
200c79da | 336 | return -ENOMEM; |
8c2f7e86 | 337 | |
200c79da DW |
338 | if (IS_ERR(addr)) |
339 | return PTR_ERR(addr); | |
7a9eb206 | 340 | pmem->virt_addr = addr; |
9e853f23 | 341 | |
7e267a8c | 342 | blk_queue_write_cache(q, true, true); |
5a92289f DW |
343 | blk_queue_make_request(q, pmem_make_request); |
344 | blk_queue_physical_block_size(q, PAGE_SIZE); | |
345 | blk_queue_max_hw_sectors(q, UINT_MAX); | |
346 | blk_queue_bounce_limit(q, BLK_BOUNCE_ANY); | |
347 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q); | |
163d4baa | 348 | queue_flag_set_unlocked(QUEUE_FLAG_DAX, q); |
5a92289f | 349 | q->queuedata = pmem; |
9e853f23 | 350 | |
538ea4aa | 351 | disk = alloc_disk_node(0, nid); |
030b99e3 DW |
352 | if (!disk) |
353 | return -ENOMEM; | |
c1d6e828 | 354 | pmem->disk = disk; |
9e853f23 | 355 | |
9e853f23 | 356 | disk->fops = &pmem_fops; |
5a92289f | 357 | disk->queue = q; |
9e853f23 | 358 | disk->flags = GENHD_FL_EXT_DEVT; |
5212e11f | 359 | nvdimm_namespace_disk_name(ndns, disk->disk_name); |
cfe30b87 DW |
360 | set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset) |
361 | / 512); | |
b95f5f43 DW |
362 | if (devm_init_badblocks(dev, &pmem->bb)) |
363 | return -ENOMEM; | |
f284a4f2 | 364 | nvdimm_badblocks_populate(nd_region, &pmem->bb, res); |
57f7f317 | 365 | disk->bb = &pmem->bb; |
f02716db | 366 | |
c1d6e828 DW |
367 | dax_dev = alloc_dax(pmem, disk->disk_name, &pmem_dax_ops); |
368 | if (!dax_dev) { | |
369 | put_disk(disk); | |
370 | return -ENOMEM; | |
371 | } | |
372 | pmem->dax_dev = dax_dev; | |
373 | ||
374 | device_add_disk(dev, disk); | |
375 | if (devm_add_action_or_reset(dev, pmem_release_disk, pmem)) | |
f02716db DW |
376 | return -ENOMEM; |
377 | ||
58138820 | 378 | revalidate_disk(disk); |
9e853f23 | 379 | |
8c2f7e86 DW |
380 | return 0; |
381 | } | |
9e853f23 | 382 | |
9f53f9fa | 383 | static int nd_pmem_probe(struct device *dev) |
9e853f23 | 384 | { |
8c2f7e86 | 385 | struct nd_namespace_common *ndns; |
9e853f23 | 386 | |
8c2f7e86 DW |
387 | ndns = nvdimm_namespace_common_probe(dev); |
388 | if (IS_ERR(ndns)) | |
389 | return PTR_ERR(ndns); | |
bf9bccc1 | 390 | |
200c79da DW |
391 | if (devm_nsio_enable(dev, to_nd_namespace_io(&ndns->dev))) |
392 | return -ENXIO; | |
708ab62b | 393 | |
200c79da | 394 | if (is_nd_btt(dev)) |
708ab62b CH |
395 | return nvdimm_namespace_attach_btt(ndns); |
396 | ||
32ab0a3f | 397 | if (is_nd_pfn(dev)) |
200c79da | 398 | return pmem_attach_disk(dev, ndns); |
32ab0a3f | 399 | |
200c79da | 400 | /* if we find a valid info-block we'll come back as that personality */ |
c5ed9268 DW |
401 | if (nd_btt_probe(dev, ndns) == 0 || nd_pfn_probe(dev, ndns) == 0 |
402 | || nd_dax_probe(dev, ndns) == 0) | |
32ab0a3f | 403 | return -ENXIO; |
32ab0a3f | 404 | |
200c79da DW |
405 | /* ...otherwise we're just a raw pmem device */ |
406 | return pmem_attach_disk(dev, ndns); | |
9e853f23 RZ |
407 | } |
408 | ||
9f53f9fa | 409 | static int nd_pmem_remove(struct device *dev) |
9e853f23 | 410 | { |
8c2f7e86 | 411 | if (is_nd_btt(dev)) |
298f2bc5 | 412 | nvdimm_namespace_detach_btt(to_nd_btt(dev)); |
476f848a DW |
413 | nvdimm_flush(to_nd_region(dev->parent)); |
414 | ||
9e853f23 RZ |
415 | return 0; |
416 | } | |
417 | ||
476f848a DW |
418 | static void nd_pmem_shutdown(struct device *dev) |
419 | { | |
420 | nvdimm_flush(to_nd_region(dev->parent)); | |
421 | } | |
422 | ||
71999466 DW |
423 | static void nd_pmem_notify(struct device *dev, enum nvdimm_event event) |
424 | { | |
b2518c78 | 425 | struct nd_region *nd_region; |
298f2bc5 DW |
426 | resource_size_t offset = 0, end_trunc = 0; |
427 | struct nd_namespace_common *ndns; | |
428 | struct nd_namespace_io *nsio; | |
429 | struct resource res; | |
b2518c78 | 430 | struct badblocks *bb; |
71999466 DW |
431 | |
432 | if (event != NVDIMM_REVALIDATE_POISON) | |
433 | return; | |
434 | ||
298f2bc5 DW |
435 | if (is_nd_btt(dev)) { |
436 | struct nd_btt *nd_btt = to_nd_btt(dev); | |
437 | ||
438 | ndns = nd_btt->ndns; | |
b2518c78 TK |
439 | nd_region = to_nd_region(ndns->dev.parent); |
440 | nsio = to_nd_namespace_io(&ndns->dev); | |
441 | bb = &nsio->bb; | |
442 | } else { | |
443 | struct pmem_device *pmem = dev_get_drvdata(dev); | |
a3901802 | 444 | |
b2518c78 TK |
445 | nd_region = to_region(pmem); |
446 | bb = &pmem->bb; | |
447 | ||
448 | if (is_nd_pfn(dev)) { | |
449 | struct nd_pfn *nd_pfn = to_nd_pfn(dev); | |
450 | struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb; | |
451 | ||
452 | ndns = nd_pfn->ndns; | |
453 | offset = pmem->data_offset + | |
454 | __le32_to_cpu(pfn_sb->start_pad); | |
455 | end_trunc = __le32_to_cpu(pfn_sb->end_trunc); | |
456 | } else { | |
457 | ndns = to_ndns(dev); | |
458 | } | |
459 | ||
460 | nsio = to_nd_namespace_io(&ndns->dev); | |
461 | } | |
a3901802 | 462 | |
298f2bc5 DW |
463 | res.start = nsio->res.start + offset; |
464 | res.end = nsio->res.end - end_trunc; | |
b2518c78 | 465 | nvdimm_badblocks_populate(nd_region, bb, &res); |
71999466 DW |
466 | } |
467 | ||
9f53f9fa DW |
468 | MODULE_ALIAS("pmem"); |
469 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO); | |
bf9bccc1 | 470 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM); |
9f53f9fa DW |
471 | static struct nd_device_driver nd_pmem_driver = { |
472 | .probe = nd_pmem_probe, | |
473 | .remove = nd_pmem_remove, | |
71999466 | 474 | .notify = nd_pmem_notify, |
476f848a | 475 | .shutdown = nd_pmem_shutdown, |
9f53f9fa DW |
476 | .drv = { |
477 | .name = "nd_pmem", | |
9e853f23 | 478 | }, |
bf9bccc1 | 479 | .type = ND_DRIVER_NAMESPACE_IO | ND_DRIVER_NAMESPACE_PMEM, |
9e853f23 RZ |
480 | }; |
481 | ||
482 | static int __init pmem_init(void) | |
483 | { | |
55155291 | 484 | return nd_driver_register(&nd_pmem_driver); |
9e853f23 RZ |
485 | } |
486 | module_init(pmem_init); | |
487 | ||
488 | static void pmem_exit(void) | |
489 | { | |
9f53f9fa | 490 | driver_unregister(&nd_pmem_driver.drv); |
9e853f23 RZ |
491 | } |
492 | module_exit(pmem_exit); | |
493 | ||
494 | MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>"); | |
495 | MODULE_LICENSE("GPL v2"); |