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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; | |
c4544205 | 44 | u64 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 | { | |
b5ebc8ec | 69 | int rc = 0; |
9e853f23 | 70 | void *mem = kmap_atomic(page); |
32ab0a3f | 71 | phys_addr_t pmem_off = sector * 512 + pmem->data_offset; |
61031952 | 72 | void __pmem *pmem_addr = pmem->virt_addr + pmem_off; |
9e853f23 RZ |
73 | |
74 | if (rw == READ) { | |
e10624f8 | 75 | if (unlikely(is_bad_pmem(&pmem->bb, sector, len))) |
b5ebc8ec DW |
76 | rc = -EIO; |
77 | else { | |
78 | memcpy_from_pmem(mem + off, pmem_addr, len); | |
79 | flush_dcache_page(page); | |
80 | } | |
9e853f23 RZ |
81 | } else { |
82 | flush_dcache_page(page); | |
61031952 | 83 | memcpy_to_pmem(pmem_addr, mem + off, len); |
9e853f23 RZ |
84 | } |
85 | ||
86 | kunmap_atomic(mem); | |
b5ebc8ec | 87 | return rc; |
9e853f23 RZ |
88 | } |
89 | ||
dece1635 | 90 | static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio) |
9e853f23 | 91 | { |
e10624f8 | 92 | int rc = 0; |
f0dc089c DW |
93 | bool do_acct; |
94 | unsigned long start; | |
9e853f23 | 95 | struct bio_vec bvec; |
9e853f23 | 96 | struct bvec_iter iter; |
edc870e5 DW |
97 | struct block_device *bdev = bio->bi_bdev; |
98 | struct pmem_device *pmem = bdev->bd_disk->private_data; | |
9e853f23 | 99 | |
f0dc089c | 100 | do_acct = nd_iostat_start(bio, &start); |
e10624f8 DW |
101 | bio_for_each_segment(bvec, bio, iter) { |
102 | rc = pmem_do_bvec(pmem, bvec.bv_page, bvec.bv_len, | |
103 | bvec.bv_offset, bio_data_dir(bio), | |
104 | iter.bi_sector); | |
105 | if (rc) { | |
106 | bio->bi_error = rc; | |
107 | break; | |
108 | } | |
109 | } | |
f0dc089c DW |
110 | if (do_acct) |
111 | nd_iostat_end(bio, start); | |
61031952 RZ |
112 | |
113 | if (bio_data_dir(bio)) | |
114 | wmb_pmem(); | |
115 | ||
4246a0b6 | 116 | bio_endio(bio); |
dece1635 | 117 | return BLK_QC_T_NONE; |
9e853f23 RZ |
118 | } |
119 | ||
120 | static int pmem_rw_page(struct block_device *bdev, sector_t sector, | |
121 | struct page *page, int rw) | |
122 | { | |
123 | struct pmem_device *pmem = bdev->bd_disk->private_data; | |
e10624f8 | 124 | int rc; |
9e853f23 | 125 | |
e10624f8 | 126 | rc = pmem_do_bvec(pmem, page, PAGE_CACHE_SIZE, 0, rw, sector); |
ba8fe0f8 RZ |
127 | if (rw & WRITE) |
128 | wmb_pmem(); | |
9e853f23 | 129 | |
e10624f8 DW |
130 | /* |
131 | * The ->rw_page interface is subtle and tricky. The core | |
132 | * retries on any error, so we can only invoke page_endio() in | |
133 | * the successful completion case. Otherwise, we'll see crashes | |
134 | * caused by double completion. | |
135 | */ | |
136 | if (rc == 0) | |
137 | page_endio(page, rw & WRITE, 0); | |
138 | ||
139 | return rc; | |
9e853f23 RZ |
140 | } |
141 | ||
142 | static long pmem_direct_access(struct block_device *bdev, sector_t sector, | |
34c0fd54 | 143 | void __pmem **kaddr, pfn_t *pfn) |
9e853f23 RZ |
144 | { |
145 | struct pmem_device *pmem = bdev->bd_disk->private_data; | |
32ab0a3f | 146 | resource_size_t offset = sector * 512 + pmem->data_offset; |
589e75d1 | 147 | |
e2e05394 | 148 | *kaddr = pmem->virt_addr + offset; |
34c0fd54 | 149 | *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags); |
9e853f23 | 150 | |
589e75d1 | 151 | return pmem->size - offset; |
9e853f23 RZ |
152 | } |
153 | ||
154 | static const struct block_device_operations pmem_fops = { | |
155 | .owner = THIS_MODULE, | |
156 | .rw_page = pmem_rw_page, | |
157 | .direct_access = pmem_direct_access, | |
58138820 | 158 | .revalidate_disk = nvdimm_revalidate_disk, |
9e853f23 RZ |
159 | }; |
160 | ||
9f53f9fa DW |
161 | static struct pmem_device *pmem_alloc(struct device *dev, |
162 | struct resource *res, int id) | |
9e853f23 RZ |
163 | { |
164 | struct pmem_device *pmem; | |
468ded03 | 165 | struct request_queue *q; |
9e853f23 | 166 | |
708ab62b | 167 | pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL); |
9e853f23 | 168 | if (!pmem) |
8c2f7e86 | 169 | return ERR_PTR(-ENOMEM); |
9e853f23 RZ |
170 | |
171 | pmem->phys_addr = res->start; | |
172 | pmem->size = resource_size(res); | |
96601adb | 173 | if (!arch_has_wmb_pmem()) |
61031952 | 174 | dev_warn(dev, "unable to guarantee persistence of writes\n"); |
9e853f23 | 175 | |
708ab62b CH |
176 | if (!devm_request_mem_region(dev, pmem->phys_addr, pmem->size, |
177 | dev_name(dev))) { | |
9f53f9fa DW |
178 | dev_warn(dev, "could not reserve region [0x%pa:0x%zx]\n", |
179 | &pmem->phys_addr, pmem->size); | |
8c2f7e86 | 180 | return ERR_PTR(-EBUSY); |
9e853f23 RZ |
181 | } |
182 | ||
468ded03 DW |
183 | q = blk_alloc_queue_node(GFP_KERNEL, dev_to_node(dev)); |
184 | if (!q) | |
185 | return ERR_PTR(-ENOMEM); | |
186 | ||
34c0fd54 DW |
187 | pmem->pfn_flags = PFN_DEV; |
188 | if (pmem_should_map_pages(dev)) { | |
4b94ffdc | 189 | pmem->virt_addr = (void __pmem *) devm_memremap_pages(dev, res, |
5c2c2587 | 190 | &q->q_usage_counter, NULL); |
34c0fd54 DW |
191 | pmem->pfn_flags |= PFN_MAP; |
192 | } else | |
a639315d DW |
193 | pmem->virt_addr = (void __pmem *) devm_memremap(dev, |
194 | pmem->phys_addr, pmem->size, | |
195 | ARCH_MEMREMAP_PMEM); | |
b36f4761 | 196 | |
468ded03 DW |
197 | if (IS_ERR(pmem->virt_addr)) { |
198 | blk_cleanup_queue(q); | |
b36f4761 | 199 | return (void __force *) pmem->virt_addr; |
468ded03 | 200 | } |
8c2f7e86 | 201 | |
468ded03 | 202 | pmem->pmem_queue = q; |
8c2f7e86 DW |
203 | return pmem; |
204 | } | |
205 | ||
206 | static void pmem_detach_disk(struct pmem_device *pmem) | |
207 | { | |
32ab0a3f DW |
208 | if (!pmem->pmem_disk) |
209 | return; | |
210 | ||
8c2f7e86 DW |
211 | del_gendisk(pmem->pmem_disk); |
212 | put_disk(pmem->pmem_disk); | |
213 | blk_cleanup_queue(pmem->pmem_queue); | |
214 | } | |
215 | ||
32ab0a3f DW |
216 | static int pmem_attach_disk(struct device *dev, |
217 | struct nd_namespace_common *ndns, struct pmem_device *pmem) | |
8c2f7e86 | 218 | { |
538ea4aa | 219 | int nid = dev_to_node(dev); |
8c2f7e86 | 220 | struct gendisk *disk; |
9e853f23 | 221 | |
9e853f23 | 222 | blk_queue_make_request(pmem->pmem_queue, pmem_make_request); |
6b47496a | 223 | blk_queue_physical_block_size(pmem->pmem_queue, PAGE_SIZE); |
43d3fa3a | 224 | blk_queue_max_hw_sectors(pmem->pmem_queue, UINT_MAX); |
9e853f23 | 225 | blk_queue_bounce_limit(pmem->pmem_queue, BLK_BOUNCE_ANY); |
0f51c4fa | 226 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, pmem->pmem_queue); |
9e853f23 | 227 | |
538ea4aa | 228 | disk = alloc_disk_node(0, nid); |
8c2f7e86 DW |
229 | if (!disk) { |
230 | blk_cleanup_queue(pmem->pmem_queue); | |
231 | return -ENOMEM; | |
232 | } | |
9e853f23 | 233 | |
9e853f23 | 234 | disk->major = pmem_major; |
9f53f9fa | 235 | disk->first_minor = 0; |
9e853f23 RZ |
236 | disk->fops = &pmem_fops; |
237 | disk->private_data = pmem; | |
238 | disk->queue = pmem->pmem_queue; | |
239 | disk->flags = GENHD_FL_EXT_DEVT; | |
5212e11f | 240 | nvdimm_namespace_disk_name(ndns, disk->disk_name); |
32ab0a3f DW |
241 | disk->driverfs_dev = dev; |
242 | set_capacity(disk, (pmem->size - pmem->data_offset) / 512); | |
9e853f23 | 243 | pmem->pmem_disk = disk; |
710d69cc | 244 | devm_exit_badblocks(dev, &pmem->bb); |
b95f5f43 DW |
245 | if (devm_init_badblocks(dev, &pmem->bb)) |
246 | return -ENOMEM; | |
247 | nvdimm_namespace_add_poison(ndns, &pmem->bb, pmem->data_offset); | |
9e853f23 | 248 | |
57f7f317 | 249 | disk->bb = &pmem->bb; |
9e853f23 | 250 | add_disk(disk); |
58138820 | 251 | revalidate_disk(disk); |
9e853f23 | 252 | |
8c2f7e86 DW |
253 | return 0; |
254 | } | |
9e853f23 | 255 | |
8c2f7e86 DW |
256 | static int pmem_rw_bytes(struct nd_namespace_common *ndns, |
257 | resource_size_t offset, void *buf, size_t size, int rw) | |
258 | { | |
259 | struct pmem_device *pmem = dev_get_drvdata(ndns->claim); | |
260 | ||
261 | if (unlikely(offset + size > pmem->size)) { | |
262 | dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n"); | |
263 | return -EFAULT; | |
264 | } | |
265 | ||
710d69cc DW |
266 | if (rw == READ) { |
267 | unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512); | |
268 | ||
269 | if (unlikely(is_bad_pmem(&pmem->bb, offset / 512, sz_align))) | |
270 | return -EIO; | |
61031952 | 271 | memcpy_from_pmem(buf, pmem->virt_addr + offset, size); |
710d69cc | 272 | } else { |
61031952 RZ |
273 | memcpy_to_pmem(pmem->virt_addr + offset, buf, size); |
274 | wmb_pmem(); | |
275 | } | |
8c2f7e86 DW |
276 | |
277 | return 0; | |
278 | } | |
279 | ||
32ab0a3f DW |
280 | static int nd_pfn_init(struct nd_pfn *nd_pfn) |
281 | { | |
282 | struct nd_pfn_sb *pfn_sb = kzalloc(sizeof(*pfn_sb), GFP_KERNEL); | |
283 | struct pmem_device *pmem = dev_get_drvdata(&nd_pfn->dev); | |
284 | struct nd_namespace_common *ndns = nd_pfn->ndns; | |
285 | struct nd_region *nd_region; | |
286 | unsigned long npfns; | |
287 | phys_addr_t offset; | |
288 | u64 checksum; | |
289 | int rc; | |
290 | ||
291 | if (!pfn_sb) | |
292 | return -ENOMEM; | |
293 | ||
294 | nd_pfn->pfn_sb = pfn_sb; | |
295 | rc = nd_pfn_validate(nd_pfn); | |
3fa96268 DW |
296 | if (rc == -ENODEV) |
297 | /* no info block, do init */; | |
298 | else | |
32ab0a3f DW |
299 | return rc; |
300 | ||
32ab0a3f DW |
301 | nd_region = to_nd_region(nd_pfn->dev.parent); |
302 | if (nd_region->ro) { | |
303 | dev_info(&nd_pfn->dev, | |
304 | "%s is read-only, unable to init metadata\n", | |
305 | dev_name(&nd_region->dev)); | |
306 | goto err; | |
307 | } | |
308 | ||
309 | memset(pfn_sb, 0, sizeof(*pfn_sb)); | |
310 | npfns = (pmem->size - SZ_8K) / SZ_4K; | |
311 | /* | |
312 | * Note, we use 64 here for the standard size of struct page, | |
313 | * debugging options may cause it to be larger in which case the | |
314 | * implementation will limit the pfns advertised through | |
315 | * ->direct_access() to those that are included in the memmap. | |
316 | */ | |
317 | if (nd_pfn->mode == PFN_MODE_PMEM) | |
315c5625 | 318 | offset = ALIGN(SZ_8K + 64 * npfns, nd_pfn->align); |
32ab0a3f | 319 | else if (nd_pfn->mode == PFN_MODE_RAM) |
315c5625 | 320 | offset = ALIGN(SZ_8K, nd_pfn->align); |
32ab0a3f DW |
321 | else |
322 | goto err; | |
323 | ||
324 | npfns = (pmem->size - offset) / SZ_4K; | |
325 | pfn_sb->mode = cpu_to_le32(nd_pfn->mode); | |
326 | pfn_sb->dataoff = cpu_to_le64(offset); | |
327 | pfn_sb->npfns = cpu_to_le64(npfns); | |
328 | memcpy(pfn_sb->signature, PFN_SIG, PFN_SIG_LEN); | |
329 | memcpy(pfn_sb->uuid, nd_pfn->uuid, 16); | |
a34d5e8a | 330 | memcpy(pfn_sb->parent_uuid, nd_dev_to_uuid(&ndns->dev), 16); |
32ab0a3f DW |
331 | pfn_sb->version_major = cpu_to_le16(1); |
332 | checksum = nd_sb_checksum((struct nd_gen_sb *) pfn_sb); | |
333 | pfn_sb->checksum = cpu_to_le64(checksum); | |
334 | ||
335 | rc = nvdimm_write_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb)); | |
336 | if (rc) | |
337 | goto err; | |
338 | ||
339 | return 0; | |
340 | err: | |
341 | nd_pfn->pfn_sb = NULL; | |
342 | kfree(pfn_sb); | |
343 | return -ENXIO; | |
344 | } | |
345 | ||
346 | static int nvdimm_namespace_detach_pfn(struct nd_namespace_common *ndns) | |
347 | { | |
348 | struct nd_pfn *nd_pfn = to_nd_pfn(ndns->claim); | |
349 | struct pmem_device *pmem; | |
350 | ||
351 | /* free pmem disk */ | |
352 | pmem = dev_get_drvdata(&nd_pfn->dev); | |
353 | pmem_detach_disk(pmem); | |
354 | ||
355 | /* release nd_pfn resources */ | |
356 | kfree(nd_pfn->pfn_sb); | |
357 | nd_pfn->pfn_sb = NULL; | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | static int nvdimm_namespace_attach_pfn(struct nd_namespace_common *ndns) | |
9e853f23 | 363 | { |
32ab0a3f DW |
364 | struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); |
365 | struct nd_pfn *nd_pfn = to_nd_pfn(ndns->claim); | |
366 | struct device *dev = &nd_pfn->dev; | |
32ab0a3f | 367 | struct nd_region *nd_region; |
d2c0f041 | 368 | struct vmem_altmap *altmap; |
32ab0a3f DW |
369 | struct nd_pfn_sb *pfn_sb; |
370 | struct pmem_device *pmem; | |
5c2c2587 | 371 | struct request_queue *q; |
32ab0a3f DW |
372 | phys_addr_t offset; |
373 | int rc; | |
d2c0f041 DW |
374 | struct vmem_altmap __altmap = { |
375 | .base_pfn = __phys_to_pfn(nsio->res.start), | |
376 | .reserve = __phys_to_pfn(SZ_8K), | |
377 | }; | |
32ab0a3f DW |
378 | |
379 | if (!nd_pfn->uuid || !nd_pfn->ndns) | |
380 | return -ENODEV; | |
381 | ||
382 | nd_region = to_nd_region(dev->parent); | |
383 | rc = nd_pfn_init(nd_pfn); | |
384 | if (rc) | |
385 | return rc; | |
386 | ||
32ab0a3f DW |
387 | pfn_sb = nd_pfn->pfn_sb; |
388 | offset = le64_to_cpu(pfn_sb->dataoff); | |
389 | nd_pfn->mode = le32_to_cpu(nd_pfn->pfn_sb->mode); | |
390 | if (nd_pfn->mode == PFN_MODE_RAM) { | |
315c5625 | 391 | if (offset < SZ_8K) |
32ab0a3f DW |
392 | return -EINVAL; |
393 | nd_pfn->npfns = le64_to_cpu(pfn_sb->npfns); | |
394 | altmap = NULL; | |
d2c0f041 DW |
395 | } else if (nd_pfn->mode == PFN_MODE_PMEM) { |
396 | nd_pfn->npfns = (resource_size(&nsio->res) - offset) | |
397 | / PAGE_SIZE; | |
398 | if (le64_to_cpu(nd_pfn->pfn_sb->npfns) > nd_pfn->npfns) | |
399 | dev_info(&nd_pfn->dev, | |
400 | "number of pfns truncated from %lld to %ld\n", | |
401 | le64_to_cpu(nd_pfn->pfn_sb->npfns), | |
402 | nd_pfn->npfns); | |
403 | altmap = & __altmap; | |
404 | altmap->free = __phys_to_pfn(offset - SZ_8K); | |
405 | altmap->alloc = 0; | |
32ab0a3f DW |
406 | } else { |
407 | rc = -ENXIO; | |
408 | goto err; | |
409 | } | |
410 | ||
411 | /* establish pfn range for lookup, and switch to direct map */ | |
412 | pmem = dev_get_drvdata(dev); | |
5c2c2587 | 413 | q = pmem->pmem_queue; |
a639315d | 414 | devm_memunmap(dev, (void __force *) pmem->virt_addr); |
4b94ffdc | 415 | pmem->virt_addr = (void __pmem *) devm_memremap_pages(dev, &nsio->res, |
5c2c2587 | 416 | &q->q_usage_counter, altmap); |
34c0fd54 | 417 | pmem->pfn_flags |= PFN_MAP; |
32ab0a3f DW |
418 | if (IS_ERR(pmem->virt_addr)) { |
419 | rc = PTR_ERR(pmem->virt_addr); | |
420 | goto err; | |
421 | } | |
422 | ||
423 | /* attach pmem disk in "pfn-mode" */ | |
424 | pmem->data_offset = offset; | |
425 | rc = pmem_attach_disk(dev, ndns, pmem); | |
426 | if (rc) | |
427 | goto err; | |
428 | ||
429 | return rc; | |
430 | err: | |
431 | nvdimm_namespace_detach_pfn(ndns); | |
432 | return rc; | |
9e853f23 RZ |
433 | } |
434 | ||
9f53f9fa | 435 | static int nd_pmem_probe(struct device *dev) |
9e853f23 | 436 | { |
9f53f9fa | 437 | struct nd_region *nd_region = to_nd_region(dev->parent); |
8c2f7e86 DW |
438 | struct nd_namespace_common *ndns; |
439 | struct nd_namespace_io *nsio; | |
9e853f23 | 440 | struct pmem_device *pmem; |
9e853f23 | 441 | |
8c2f7e86 DW |
442 | ndns = nvdimm_namespace_common_probe(dev); |
443 | if (IS_ERR(ndns)) | |
444 | return PTR_ERR(ndns); | |
bf9bccc1 | 445 | |
8c2f7e86 | 446 | nsio = to_nd_namespace_io(&ndns->dev); |
9f53f9fa | 447 | pmem = pmem_alloc(dev, &nsio->res, nd_region->id); |
9e853f23 RZ |
448 | if (IS_ERR(pmem)) |
449 | return PTR_ERR(pmem); | |
450 | ||
32ab0a3f | 451 | pmem->ndns = ndns; |
9f53f9fa | 452 | dev_set_drvdata(dev, pmem); |
8c2f7e86 | 453 | ndns->rw_bytes = pmem_rw_bytes; |
710d69cc DW |
454 | if (devm_init_badblocks(dev, &pmem->bb)) |
455 | return -ENOMEM; | |
456 | nvdimm_namespace_add_poison(ndns, &pmem->bb, 0); | |
708ab62b | 457 | |
468ded03 DW |
458 | if (is_nd_btt(dev)) { |
459 | /* btt allocates its own request_queue */ | |
460 | blk_cleanup_queue(pmem->pmem_queue); | |
461 | pmem->pmem_queue = NULL; | |
708ab62b | 462 | return nvdimm_namespace_attach_btt(ndns); |
468ded03 | 463 | } |
708ab62b | 464 | |
32ab0a3f DW |
465 | if (is_nd_pfn(dev)) |
466 | return nvdimm_namespace_attach_pfn(ndns); | |
467 | ||
468ded03 DW |
468 | if (nd_btt_probe(ndns, pmem) == 0 || nd_pfn_probe(ndns, pmem) == 0) { |
469 | /* | |
470 | * We'll come back as either btt-pmem, or pfn-pmem, so | |
471 | * drop the queue allocation for now. | |
472 | */ | |
473 | blk_cleanup_queue(pmem->pmem_queue); | |
32ab0a3f DW |
474 | return -ENXIO; |
475 | } | |
476 | ||
477 | return pmem_attach_disk(dev, ndns, pmem); | |
9e853f23 RZ |
478 | } |
479 | ||
9f53f9fa | 480 | static int nd_pmem_remove(struct device *dev) |
9e853f23 | 481 | { |
9f53f9fa | 482 | struct pmem_device *pmem = dev_get_drvdata(dev); |
9e853f23 | 483 | |
8c2f7e86 | 484 | if (is_nd_btt(dev)) |
32ab0a3f DW |
485 | nvdimm_namespace_detach_btt(pmem->ndns); |
486 | else if (is_nd_pfn(dev)) | |
487 | nvdimm_namespace_detach_pfn(pmem->ndns); | |
8c2f7e86 DW |
488 | else |
489 | pmem_detach_disk(pmem); | |
8c2f7e86 | 490 | |
9e853f23 RZ |
491 | return 0; |
492 | } | |
493 | ||
71999466 DW |
494 | static void nd_pmem_notify(struct device *dev, enum nvdimm_event event) |
495 | { | |
496 | struct pmem_device *pmem = dev_get_drvdata(dev); | |
497 | struct nd_namespace_common *ndns = pmem->ndns; | |
498 | ||
499 | if (event != NVDIMM_REVALIDATE_POISON) | |
500 | return; | |
501 | ||
502 | if (is_nd_btt(dev)) | |
503 | nvdimm_namespace_add_poison(ndns, &pmem->bb, 0); | |
504 | else | |
505 | nvdimm_namespace_add_poison(ndns, &pmem->bb, pmem->data_offset); | |
506 | } | |
507 | ||
9f53f9fa DW |
508 | MODULE_ALIAS("pmem"); |
509 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO); | |
bf9bccc1 | 510 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM); |
9f53f9fa DW |
511 | static struct nd_device_driver nd_pmem_driver = { |
512 | .probe = nd_pmem_probe, | |
513 | .remove = nd_pmem_remove, | |
71999466 | 514 | .notify = nd_pmem_notify, |
9f53f9fa DW |
515 | .drv = { |
516 | .name = "nd_pmem", | |
9e853f23 | 517 | }, |
bf9bccc1 | 518 | .type = ND_DRIVER_NAMESPACE_IO | ND_DRIVER_NAMESPACE_PMEM, |
9e853f23 RZ |
519 | }; |
520 | ||
521 | static int __init pmem_init(void) | |
522 | { | |
523 | int error; | |
524 | ||
525 | pmem_major = register_blkdev(0, "pmem"); | |
526 | if (pmem_major < 0) | |
527 | return pmem_major; | |
528 | ||
9f53f9fa DW |
529 | error = nd_driver_register(&nd_pmem_driver); |
530 | if (error) { | |
9e853f23 | 531 | unregister_blkdev(pmem_major, "pmem"); |
9f53f9fa DW |
532 | return error; |
533 | } | |
534 | ||
535 | return 0; | |
9e853f23 RZ |
536 | } |
537 | module_init(pmem_init); | |
538 | ||
539 | static void pmem_exit(void) | |
540 | { | |
9f53f9fa | 541 | driver_unregister(&nd_pmem_driver.drv); |
9e853f23 RZ |
542 | unregister_blkdev(pmem_major, "pmem"); |
543 | } | |
544 | module_exit(pmem_exit); | |
545 | ||
546 | MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>"); | |
547 | MODULE_LICENSE("GPL v2"); |