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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> |
34c0fd54 | 28 | #include <linux/pfn_t.h> |
9e853f23 | 29 | #include <linux/slab.h> |
61031952 | 30 | #include <linux/pmem.h> |
9f53f9fa | 31 | #include <linux/nd.h> |
32ab0a3f | 32 | #include "pfn.h" |
9f53f9fa | 33 | #include "nd.h" |
9e853f23 RZ |
34 | |
35 | struct pmem_device { | |
36 | struct request_queue *pmem_queue; | |
37 | struct gendisk *pmem_disk; | |
32ab0a3f | 38 | struct nd_namespace_common *ndns; |
9e853f23 RZ |
39 | |
40 | /* One contiguous memory region per device */ | |
41 | phys_addr_t phys_addr; | |
32ab0a3f DW |
42 | /* when non-zero this device is hosting a 'pfn' instance */ |
43 | phys_addr_t data_offset; | |
34c0fd54 | 44 | unsigned long pfn_flags; |
61031952 | 45 | void __pmem *virt_addr; |
9e853f23 | 46 | size_t size; |
b95f5f43 | 47 | struct badblocks bb; |
9e853f23 RZ |
48 | }; |
49 | ||
50 | static int pmem_major; | |
9e853f23 | 51 | |
e10624f8 DW |
52 | static bool is_bad_pmem(struct badblocks *bb, sector_t sector, unsigned int len) |
53 | { | |
54 | if (bb->count) { | |
55 | sector_t first_bad; | |
56 | int num_bad; | |
57 | ||
58 | return !!badblocks_check(bb, sector, len / 512, &first_bad, | |
59 | &num_bad); | |
60 | } | |
61 | ||
62 | return false; | |
63 | } | |
64 | ||
65 | static int pmem_do_bvec(struct pmem_device *pmem, struct page *page, | |
9e853f23 RZ |
66 | unsigned int len, unsigned int off, int rw, |
67 | sector_t sector) | |
68 | { | |
69 | void *mem = kmap_atomic(page); | |
32ab0a3f | 70 | phys_addr_t pmem_off = sector * 512 + pmem->data_offset; |
61031952 | 71 | void __pmem *pmem_addr = pmem->virt_addr + pmem_off; |
9e853f23 RZ |
72 | |
73 | if (rw == READ) { | |
e10624f8 DW |
74 | if (unlikely(is_bad_pmem(&pmem->bb, sector, len))) |
75 | return -EIO; | |
61031952 | 76 | memcpy_from_pmem(mem + off, pmem_addr, len); |
9e853f23 RZ |
77 | flush_dcache_page(page); |
78 | } else { | |
79 | flush_dcache_page(page); | |
61031952 | 80 | memcpy_to_pmem(pmem_addr, mem + off, len); |
9e853f23 RZ |
81 | } |
82 | ||
83 | kunmap_atomic(mem); | |
e10624f8 | 84 | return 0; |
9e853f23 RZ |
85 | } |
86 | ||
dece1635 | 87 | static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio) |
9e853f23 | 88 | { |
e10624f8 | 89 | int rc = 0; |
f0dc089c DW |
90 | bool do_acct; |
91 | unsigned long start; | |
9e853f23 | 92 | struct bio_vec bvec; |
9e853f23 | 93 | struct bvec_iter iter; |
edc870e5 DW |
94 | struct block_device *bdev = bio->bi_bdev; |
95 | struct pmem_device *pmem = bdev->bd_disk->private_data; | |
9e853f23 | 96 | |
f0dc089c | 97 | do_acct = nd_iostat_start(bio, &start); |
e10624f8 DW |
98 | bio_for_each_segment(bvec, bio, iter) { |
99 | rc = pmem_do_bvec(pmem, bvec.bv_page, bvec.bv_len, | |
100 | bvec.bv_offset, bio_data_dir(bio), | |
101 | iter.bi_sector); | |
102 | if (rc) { | |
103 | bio->bi_error = rc; | |
104 | break; | |
105 | } | |
106 | } | |
f0dc089c DW |
107 | if (do_acct) |
108 | nd_iostat_end(bio, start); | |
61031952 RZ |
109 | |
110 | if (bio_data_dir(bio)) | |
111 | wmb_pmem(); | |
112 | ||
4246a0b6 | 113 | bio_endio(bio); |
dece1635 | 114 | return BLK_QC_T_NONE; |
9e853f23 RZ |
115 | } |
116 | ||
117 | static int pmem_rw_page(struct block_device *bdev, sector_t sector, | |
118 | struct page *page, int rw) | |
119 | { | |
120 | struct pmem_device *pmem = bdev->bd_disk->private_data; | |
e10624f8 | 121 | int rc; |
9e853f23 | 122 | |
e10624f8 | 123 | rc = pmem_do_bvec(pmem, page, PAGE_CACHE_SIZE, 0, rw, sector); |
ba8fe0f8 RZ |
124 | if (rw & WRITE) |
125 | wmb_pmem(); | |
9e853f23 | 126 | |
e10624f8 DW |
127 | /* |
128 | * The ->rw_page interface is subtle and tricky. The core | |
129 | * retries on any error, so we can only invoke page_endio() in | |
130 | * the successful completion case. Otherwise, we'll see crashes | |
131 | * caused by double completion. | |
132 | */ | |
133 | if (rc == 0) | |
134 | page_endio(page, rw & WRITE, 0); | |
135 | ||
136 | return rc; | |
9e853f23 RZ |
137 | } |
138 | ||
139 | static long pmem_direct_access(struct block_device *bdev, sector_t sector, | |
34c0fd54 | 140 | void __pmem **kaddr, pfn_t *pfn) |
9e853f23 RZ |
141 | { |
142 | struct pmem_device *pmem = bdev->bd_disk->private_data; | |
32ab0a3f | 143 | resource_size_t offset = sector * 512 + pmem->data_offset; |
589e75d1 | 144 | |
e2e05394 | 145 | *kaddr = pmem->virt_addr + offset; |
34c0fd54 | 146 | *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags); |
9e853f23 | 147 | |
589e75d1 | 148 | return pmem->size - offset; |
9e853f23 RZ |
149 | } |
150 | ||
151 | static const struct block_device_operations pmem_fops = { | |
152 | .owner = THIS_MODULE, | |
153 | .rw_page = pmem_rw_page, | |
154 | .direct_access = pmem_direct_access, | |
58138820 | 155 | .revalidate_disk = nvdimm_revalidate_disk, |
9e853f23 RZ |
156 | }; |
157 | ||
9f53f9fa DW |
158 | static struct pmem_device *pmem_alloc(struct device *dev, |
159 | struct resource *res, int id) | |
9e853f23 RZ |
160 | { |
161 | struct pmem_device *pmem; | |
9e853f23 | 162 | |
708ab62b | 163 | pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL); |
9e853f23 | 164 | if (!pmem) |
8c2f7e86 | 165 | return ERR_PTR(-ENOMEM); |
9e853f23 RZ |
166 | |
167 | pmem->phys_addr = res->start; | |
168 | pmem->size = resource_size(res); | |
96601adb | 169 | if (!arch_has_wmb_pmem()) |
61031952 | 170 | dev_warn(dev, "unable to guarantee persistence of writes\n"); |
9e853f23 | 171 | |
708ab62b CH |
172 | if (!devm_request_mem_region(dev, pmem->phys_addr, pmem->size, |
173 | dev_name(dev))) { | |
9f53f9fa DW |
174 | dev_warn(dev, "could not reserve region [0x%pa:0x%zx]\n", |
175 | &pmem->phys_addr, pmem->size); | |
8c2f7e86 | 176 | return ERR_PTR(-EBUSY); |
9e853f23 RZ |
177 | } |
178 | ||
34c0fd54 DW |
179 | pmem->pfn_flags = PFN_DEV; |
180 | if (pmem_should_map_pages(dev)) { | |
4b94ffdc DW |
181 | pmem->virt_addr = (void __pmem *) devm_memremap_pages(dev, res, |
182 | NULL); | |
34c0fd54 DW |
183 | pmem->pfn_flags |= PFN_MAP; |
184 | } else | |
a639315d DW |
185 | pmem->virt_addr = (void __pmem *) devm_memremap(dev, |
186 | pmem->phys_addr, pmem->size, | |
187 | ARCH_MEMREMAP_PMEM); | |
b36f4761 DW |
188 | |
189 | if (IS_ERR(pmem->virt_addr)) | |
190 | return (void __force *) pmem->virt_addr; | |
8c2f7e86 DW |
191 | |
192 | return pmem; | |
193 | } | |
194 | ||
195 | static void pmem_detach_disk(struct pmem_device *pmem) | |
196 | { | |
32ab0a3f DW |
197 | if (!pmem->pmem_disk) |
198 | return; | |
199 | ||
8c2f7e86 DW |
200 | del_gendisk(pmem->pmem_disk); |
201 | put_disk(pmem->pmem_disk); | |
202 | blk_cleanup_queue(pmem->pmem_queue); | |
203 | } | |
204 | ||
32ab0a3f DW |
205 | static int pmem_attach_disk(struct device *dev, |
206 | struct nd_namespace_common *ndns, struct pmem_device *pmem) | |
8c2f7e86 | 207 | { |
538ea4aa | 208 | int nid = dev_to_node(dev); |
8c2f7e86 | 209 | struct gendisk *disk; |
9e853f23 | 210 | |
538ea4aa | 211 | pmem->pmem_queue = blk_alloc_queue_node(GFP_KERNEL, nid); |
9e853f23 | 212 | if (!pmem->pmem_queue) |
8c2f7e86 | 213 | return -ENOMEM; |
9e853f23 RZ |
214 | |
215 | blk_queue_make_request(pmem->pmem_queue, pmem_make_request); | |
6b47496a | 216 | blk_queue_physical_block_size(pmem->pmem_queue, PAGE_SIZE); |
43d3fa3a | 217 | blk_queue_max_hw_sectors(pmem->pmem_queue, UINT_MAX); |
9e853f23 | 218 | blk_queue_bounce_limit(pmem->pmem_queue, BLK_BOUNCE_ANY); |
0f51c4fa | 219 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, pmem->pmem_queue); |
9e853f23 | 220 | |
538ea4aa | 221 | disk = alloc_disk_node(0, nid); |
8c2f7e86 DW |
222 | if (!disk) { |
223 | blk_cleanup_queue(pmem->pmem_queue); | |
224 | return -ENOMEM; | |
225 | } | |
9e853f23 | 226 | |
9e853f23 | 227 | disk->major = pmem_major; |
9f53f9fa | 228 | disk->first_minor = 0; |
9e853f23 RZ |
229 | disk->fops = &pmem_fops; |
230 | disk->private_data = pmem; | |
231 | disk->queue = pmem->pmem_queue; | |
232 | disk->flags = GENHD_FL_EXT_DEVT; | |
5212e11f | 233 | nvdimm_namespace_disk_name(ndns, disk->disk_name); |
32ab0a3f DW |
234 | disk->driverfs_dev = dev; |
235 | set_capacity(disk, (pmem->size - pmem->data_offset) / 512); | |
9e853f23 | 236 | pmem->pmem_disk = disk; |
710d69cc | 237 | devm_exit_badblocks(dev, &pmem->bb); |
b95f5f43 DW |
238 | if (devm_init_badblocks(dev, &pmem->bb)) |
239 | return -ENOMEM; | |
240 | nvdimm_namespace_add_poison(ndns, &pmem->bb, pmem->data_offset); | |
9e853f23 | 241 | |
57f7f317 | 242 | disk->bb = &pmem->bb; |
9e853f23 | 243 | add_disk(disk); |
58138820 | 244 | revalidate_disk(disk); |
9e853f23 | 245 | |
8c2f7e86 DW |
246 | return 0; |
247 | } | |
9e853f23 | 248 | |
8c2f7e86 DW |
249 | static int pmem_rw_bytes(struct nd_namespace_common *ndns, |
250 | resource_size_t offset, void *buf, size_t size, int rw) | |
251 | { | |
252 | struct pmem_device *pmem = dev_get_drvdata(ndns->claim); | |
253 | ||
254 | if (unlikely(offset + size > pmem->size)) { | |
255 | dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n"); | |
256 | return -EFAULT; | |
257 | } | |
258 | ||
710d69cc DW |
259 | if (rw == READ) { |
260 | unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512); | |
261 | ||
262 | if (unlikely(is_bad_pmem(&pmem->bb, offset / 512, sz_align))) | |
263 | return -EIO; | |
61031952 | 264 | memcpy_from_pmem(buf, pmem->virt_addr + offset, size); |
710d69cc | 265 | } else { |
61031952 RZ |
266 | memcpy_to_pmem(pmem->virt_addr + offset, buf, size); |
267 | wmb_pmem(); | |
268 | } | |
8c2f7e86 DW |
269 | |
270 | return 0; | |
271 | } | |
272 | ||
32ab0a3f DW |
273 | static int nd_pfn_init(struct nd_pfn *nd_pfn) |
274 | { | |
275 | struct nd_pfn_sb *pfn_sb = kzalloc(sizeof(*pfn_sb), GFP_KERNEL); | |
276 | struct pmem_device *pmem = dev_get_drvdata(&nd_pfn->dev); | |
277 | struct nd_namespace_common *ndns = nd_pfn->ndns; | |
278 | struct nd_region *nd_region; | |
279 | unsigned long npfns; | |
280 | phys_addr_t offset; | |
281 | u64 checksum; | |
282 | int rc; | |
283 | ||
284 | if (!pfn_sb) | |
285 | return -ENOMEM; | |
286 | ||
287 | nd_pfn->pfn_sb = pfn_sb; | |
288 | rc = nd_pfn_validate(nd_pfn); | |
3fa96268 DW |
289 | if (rc == -ENODEV) |
290 | /* no info block, do init */; | |
291 | else | |
32ab0a3f DW |
292 | return rc; |
293 | ||
32ab0a3f DW |
294 | nd_region = to_nd_region(nd_pfn->dev.parent); |
295 | if (nd_region->ro) { | |
296 | dev_info(&nd_pfn->dev, | |
297 | "%s is read-only, unable to init metadata\n", | |
298 | dev_name(&nd_region->dev)); | |
299 | goto err; | |
300 | } | |
301 | ||
302 | memset(pfn_sb, 0, sizeof(*pfn_sb)); | |
303 | npfns = (pmem->size - SZ_8K) / SZ_4K; | |
304 | /* | |
305 | * Note, we use 64 here for the standard size of struct page, | |
306 | * debugging options may cause it to be larger in which case the | |
307 | * implementation will limit the pfns advertised through | |
308 | * ->direct_access() to those that are included in the memmap. | |
309 | */ | |
310 | if (nd_pfn->mode == PFN_MODE_PMEM) | |
315c5625 | 311 | offset = ALIGN(SZ_8K + 64 * npfns, nd_pfn->align); |
32ab0a3f | 312 | else if (nd_pfn->mode == PFN_MODE_RAM) |
315c5625 | 313 | offset = ALIGN(SZ_8K, nd_pfn->align); |
32ab0a3f DW |
314 | else |
315 | goto err; | |
316 | ||
317 | npfns = (pmem->size - offset) / SZ_4K; | |
318 | pfn_sb->mode = cpu_to_le32(nd_pfn->mode); | |
319 | pfn_sb->dataoff = cpu_to_le64(offset); | |
320 | pfn_sb->npfns = cpu_to_le64(npfns); | |
321 | memcpy(pfn_sb->signature, PFN_SIG, PFN_SIG_LEN); | |
322 | memcpy(pfn_sb->uuid, nd_pfn->uuid, 16); | |
a34d5e8a | 323 | memcpy(pfn_sb->parent_uuid, nd_dev_to_uuid(&ndns->dev), 16); |
32ab0a3f DW |
324 | pfn_sb->version_major = cpu_to_le16(1); |
325 | checksum = nd_sb_checksum((struct nd_gen_sb *) pfn_sb); | |
326 | pfn_sb->checksum = cpu_to_le64(checksum); | |
327 | ||
328 | rc = nvdimm_write_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb)); | |
329 | if (rc) | |
330 | goto err; | |
331 | ||
332 | return 0; | |
333 | err: | |
334 | nd_pfn->pfn_sb = NULL; | |
335 | kfree(pfn_sb); | |
336 | return -ENXIO; | |
337 | } | |
338 | ||
339 | static int nvdimm_namespace_detach_pfn(struct nd_namespace_common *ndns) | |
340 | { | |
341 | struct nd_pfn *nd_pfn = to_nd_pfn(ndns->claim); | |
342 | struct pmem_device *pmem; | |
343 | ||
344 | /* free pmem disk */ | |
345 | pmem = dev_get_drvdata(&nd_pfn->dev); | |
346 | pmem_detach_disk(pmem); | |
347 | ||
348 | /* release nd_pfn resources */ | |
349 | kfree(nd_pfn->pfn_sb); | |
350 | nd_pfn->pfn_sb = NULL; | |
351 | ||
352 | return 0; | |
353 | } | |
354 | ||
355 | static int nvdimm_namespace_attach_pfn(struct nd_namespace_common *ndns) | |
9e853f23 | 356 | { |
32ab0a3f DW |
357 | struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); |
358 | struct nd_pfn *nd_pfn = to_nd_pfn(ndns->claim); | |
359 | struct device *dev = &nd_pfn->dev; | |
32ab0a3f | 360 | struct nd_region *nd_region; |
d2c0f041 | 361 | struct vmem_altmap *altmap; |
32ab0a3f DW |
362 | struct nd_pfn_sb *pfn_sb; |
363 | struct pmem_device *pmem; | |
364 | phys_addr_t offset; | |
365 | int rc; | |
d2c0f041 DW |
366 | struct vmem_altmap __altmap = { |
367 | .base_pfn = __phys_to_pfn(nsio->res.start), | |
368 | .reserve = __phys_to_pfn(SZ_8K), | |
369 | }; | |
32ab0a3f DW |
370 | |
371 | if (!nd_pfn->uuid || !nd_pfn->ndns) | |
372 | return -ENODEV; | |
373 | ||
374 | nd_region = to_nd_region(dev->parent); | |
375 | rc = nd_pfn_init(nd_pfn); | |
376 | if (rc) | |
377 | return rc; | |
378 | ||
32ab0a3f DW |
379 | pfn_sb = nd_pfn->pfn_sb; |
380 | offset = le64_to_cpu(pfn_sb->dataoff); | |
381 | nd_pfn->mode = le32_to_cpu(nd_pfn->pfn_sb->mode); | |
382 | if (nd_pfn->mode == PFN_MODE_RAM) { | |
315c5625 | 383 | if (offset < SZ_8K) |
32ab0a3f DW |
384 | return -EINVAL; |
385 | nd_pfn->npfns = le64_to_cpu(pfn_sb->npfns); | |
386 | altmap = NULL; | |
d2c0f041 DW |
387 | } else if (nd_pfn->mode == PFN_MODE_PMEM) { |
388 | nd_pfn->npfns = (resource_size(&nsio->res) - offset) | |
389 | / PAGE_SIZE; | |
390 | if (le64_to_cpu(nd_pfn->pfn_sb->npfns) > nd_pfn->npfns) | |
391 | dev_info(&nd_pfn->dev, | |
392 | "number of pfns truncated from %lld to %ld\n", | |
393 | le64_to_cpu(nd_pfn->pfn_sb->npfns), | |
394 | nd_pfn->npfns); | |
395 | altmap = & __altmap; | |
396 | altmap->free = __phys_to_pfn(offset - SZ_8K); | |
397 | altmap->alloc = 0; | |
32ab0a3f DW |
398 | } else { |
399 | rc = -ENXIO; | |
400 | goto err; | |
401 | } | |
402 | ||
403 | /* establish pfn range for lookup, and switch to direct map */ | |
404 | pmem = dev_get_drvdata(dev); | |
a639315d | 405 | devm_memunmap(dev, (void __force *) pmem->virt_addr); |
4b94ffdc | 406 | pmem->virt_addr = (void __pmem *) devm_memremap_pages(dev, &nsio->res, |
d2c0f041 | 407 | altmap); |
34c0fd54 | 408 | pmem->pfn_flags |= PFN_MAP; |
32ab0a3f DW |
409 | if (IS_ERR(pmem->virt_addr)) { |
410 | rc = PTR_ERR(pmem->virt_addr); | |
411 | goto err; | |
412 | } | |
413 | ||
414 | /* attach pmem disk in "pfn-mode" */ | |
415 | pmem->data_offset = offset; | |
416 | rc = pmem_attach_disk(dev, ndns, pmem); | |
417 | if (rc) | |
418 | goto err; | |
419 | ||
420 | return rc; | |
421 | err: | |
422 | nvdimm_namespace_detach_pfn(ndns); | |
423 | return rc; | |
9e853f23 RZ |
424 | } |
425 | ||
9f53f9fa | 426 | static int nd_pmem_probe(struct device *dev) |
9e853f23 | 427 | { |
9f53f9fa | 428 | struct nd_region *nd_region = to_nd_region(dev->parent); |
8c2f7e86 DW |
429 | struct nd_namespace_common *ndns; |
430 | struct nd_namespace_io *nsio; | |
9e853f23 | 431 | struct pmem_device *pmem; |
9e853f23 | 432 | |
8c2f7e86 DW |
433 | ndns = nvdimm_namespace_common_probe(dev); |
434 | if (IS_ERR(ndns)) | |
435 | return PTR_ERR(ndns); | |
bf9bccc1 | 436 | |
8c2f7e86 | 437 | nsio = to_nd_namespace_io(&ndns->dev); |
9f53f9fa | 438 | pmem = pmem_alloc(dev, &nsio->res, nd_region->id); |
9e853f23 RZ |
439 | if (IS_ERR(pmem)) |
440 | return PTR_ERR(pmem); | |
441 | ||
32ab0a3f | 442 | pmem->ndns = ndns; |
9f53f9fa | 443 | dev_set_drvdata(dev, pmem); |
8c2f7e86 | 444 | ndns->rw_bytes = pmem_rw_bytes; |
710d69cc DW |
445 | if (devm_init_badblocks(dev, &pmem->bb)) |
446 | return -ENOMEM; | |
447 | nvdimm_namespace_add_poison(ndns, &pmem->bb, 0); | |
708ab62b | 448 | |
8c2f7e86 | 449 | if (is_nd_btt(dev)) |
708ab62b CH |
450 | return nvdimm_namespace_attach_btt(ndns); |
451 | ||
32ab0a3f DW |
452 | if (is_nd_pfn(dev)) |
453 | return nvdimm_namespace_attach_pfn(ndns); | |
454 | ||
455 | if (nd_btt_probe(ndns, pmem) == 0) { | |
8c2f7e86 | 456 | /* we'll come back as btt-pmem */ |
708ab62b | 457 | return -ENXIO; |
32ab0a3f DW |
458 | } |
459 | ||
460 | if (nd_pfn_probe(ndns, pmem) == 0) { | |
461 | /* we'll come back as pfn-pmem */ | |
462 | return -ENXIO; | |
463 | } | |
464 | ||
465 | return pmem_attach_disk(dev, ndns, pmem); | |
9e853f23 RZ |
466 | } |
467 | ||
9f53f9fa | 468 | static int nd_pmem_remove(struct device *dev) |
9e853f23 | 469 | { |
9f53f9fa | 470 | struct pmem_device *pmem = dev_get_drvdata(dev); |
9e853f23 | 471 | |
8c2f7e86 | 472 | if (is_nd_btt(dev)) |
32ab0a3f DW |
473 | nvdimm_namespace_detach_btt(pmem->ndns); |
474 | else if (is_nd_pfn(dev)) | |
475 | nvdimm_namespace_detach_pfn(pmem->ndns); | |
8c2f7e86 DW |
476 | else |
477 | pmem_detach_disk(pmem); | |
8c2f7e86 | 478 | |
9e853f23 RZ |
479 | return 0; |
480 | } | |
481 | ||
9f53f9fa DW |
482 | MODULE_ALIAS("pmem"); |
483 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO); | |
bf9bccc1 | 484 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM); |
9f53f9fa DW |
485 | static struct nd_device_driver nd_pmem_driver = { |
486 | .probe = nd_pmem_probe, | |
487 | .remove = nd_pmem_remove, | |
488 | .drv = { | |
489 | .name = "nd_pmem", | |
9e853f23 | 490 | }, |
bf9bccc1 | 491 | .type = ND_DRIVER_NAMESPACE_IO | ND_DRIVER_NAMESPACE_PMEM, |
9e853f23 RZ |
492 | }; |
493 | ||
494 | static int __init pmem_init(void) | |
495 | { | |
496 | int error; | |
497 | ||
498 | pmem_major = register_blkdev(0, "pmem"); | |
499 | if (pmem_major < 0) | |
500 | return pmem_major; | |
501 | ||
9f53f9fa DW |
502 | error = nd_driver_register(&nd_pmem_driver); |
503 | if (error) { | |
9e853f23 | 504 | unregister_blkdev(pmem_major, "pmem"); |
9f53f9fa DW |
505 | return error; |
506 | } | |
507 | ||
508 | return 0; | |
9e853f23 RZ |
509 | } |
510 | module_init(pmem_init); | |
511 | ||
512 | static void pmem_exit(void) | |
513 | { | |
9f53f9fa | 514 | driver_unregister(&nd_pmem_driver.drv); |
9e853f23 RZ |
515 | unregister_blkdev(pmem_major, "pmem"); |
516 | } | |
517 | module_exit(pmem_exit); | |
518 | ||
519 | MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>"); | |
520 | MODULE_LICENSE("GPL v2"); |