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2025cf9e | 1 | // SPDX-License-Identifier: GPL-2.0-only |
9e853f23 RZ |
2 | /* |
3 | * Persistent Memory Driver | |
4 | * | |
9f53f9fa | 5 | * Copyright (c) 2014-2015, Intel Corporation. |
9e853f23 RZ |
6 | * Copyright (c) 2015, Christoph Hellwig <hch@lst.de>. |
7 | * Copyright (c) 2015, Boaz Harrosh <boaz@plexistor.com>. | |
9e853f23 RZ |
8 | */ |
9 | ||
10 | #include <asm/cacheflush.h> | |
11 | #include <linux/blkdev.h> | |
12 | #include <linux/hdreg.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/platform_device.h> | |
c953cc98 | 15 | #include <linux/set_memory.h> |
9e853f23 RZ |
16 | #include <linux/module.h> |
17 | #include <linux/moduleparam.h> | |
b95f5f43 | 18 | #include <linux/badblocks.h> |
9476df7d | 19 | #include <linux/memremap.h> |
32ab0a3f | 20 | #include <linux/vmalloc.h> |
71389703 | 21 | #include <linux/blk-mq.h> |
34c0fd54 | 22 | #include <linux/pfn_t.h> |
9e853f23 | 23 | #include <linux/slab.h> |
0aed55af | 24 | #include <linux/uio.h> |
c1d6e828 | 25 | #include <linux/dax.h> |
9f53f9fa | 26 | #include <linux/nd.h> |
23c47d2a | 27 | #include <linux/backing-dev.h> |
f295e53b | 28 | #include "pmem.h" |
32ab0a3f | 29 | #include "pfn.h" |
9f53f9fa | 30 | #include "nd.h" |
9e853f23 | 31 | |
f284a4f2 DW |
32 | static struct device *to_dev(struct pmem_device *pmem) |
33 | { | |
34 | /* | |
35 | * nvdimm bus services need a 'dev' parameter, and we record the device | |
36 | * at init in bb.dev. | |
37 | */ | |
38 | return pmem->bb.dev; | |
39 | } | |
40 | ||
41 | static struct nd_region *to_region(struct pmem_device *pmem) | |
42 | { | |
43 | return to_nd_region(to_dev(pmem)->parent); | |
44 | } | |
9e853f23 | 45 | |
c953cc98 DW |
46 | static void hwpoison_clear(struct pmem_device *pmem, |
47 | phys_addr_t phys, unsigned int len) | |
48 | { | |
49 | unsigned long pfn_start, pfn_end, pfn; | |
50 | ||
51 | /* only pmem in the linear map supports HWPoison */ | |
52 | if (is_vmalloc_addr(pmem->virt_addr)) | |
53 | return; | |
54 | ||
55 | pfn_start = PHYS_PFN(phys); | |
56 | pfn_end = pfn_start + PHYS_PFN(len); | |
57 | for (pfn = pfn_start; pfn < pfn_end; pfn++) { | |
58 | struct page *page = pfn_to_page(pfn); | |
59 | ||
60 | /* | |
61 | * Note, no need to hold a get_dev_pagemap() reference | |
62 | * here since we're in the driver I/O path and | |
63 | * outstanding I/O requests pin the dev_pagemap. | |
64 | */ | |
65 | if (test_and_clear_pmem_poison(page)) | |
66 | clear_mce_nospec(pfn); | |
67 | } | |
68 | } | |
69 | ||
4e4cbee9 CH |
70 | static blk_status_t pmem_clear_poison(struct pmem_device *pmem, |
71 | phys_addr_t offset, unsigned int len) | |
59e64739 | 72 | { |
f284a4f2 | 73 | struct device *dev = to_dev(pmem); |
59e64739 DW |
74 | sector_t sector; |
75 | long cleared; | |
4e4cbee9 | 76 | blk_status_t rc = BLK_STS_OK; |
59e64739 DW |
77 | |
78 | sector = (offset - pmem->data_offset) / 512; | |
59e64739 | 79 | |
868f036f DW |
80 | cleared = nvdimm_clear_poison(dev, pmem->phys_addr + offset, len); |
81 | if (cleared < len) | |
4e4cbee9 | 82 | rc = BLK_STS_IOERR; |
59e64739 | 83 | if (cleared > 0 && cleared / 512) { |
c953cc98 | 84 | hwpoison_clear(pmem, pmem->phys_addr + offset, cleared); |
868f036f | 85 | cleared /= 512; |
426824d6 | 86 | dev_dbg(dev, "%#llx clear %ld sector%s\n", |
868f036f DW |
87 | (unsigned long long) sector, cleared, |
88 | cleared > 1 ? "s" : ""); | |
0a3f27b9 | 89 | badblocks_clear(&pmem->bb, sector, cleared); |
975750a9 TK |
90 | if (pmem->bb_state) |
91 | sysfs_notify_dirent(pmem->bb_state); | |
59e64739 | 92 | } |
3115bb02 | 93 | |
f2b61257 | 94 | arch_invalidate_pmem(pmem->virt_addr + offset, len); |
868f036f DW |
95 | |
96 | return rc; | |
59e64739 DW |
97 | } |
98 | ||
bd697a80 VV |
99 | static void write_pmem(void *pmem_addr, struct page *page, |
100 | unsigned int off, unsigned int len) | |
101 | { | |
98cc093c HY |
102 | unsigned int chunk; |
103 | void *mem; | |
104 | ||
105 | while (len) { | |
106 | mem = kmap_atomic(page); | |
9dc6488e | 107 | chunk = min_t(unsigned int, len, PAGE_SIZE - off); |
98cc093c HY |
108 | memcpy_flushcache(pmem_addr, mem + off, chunk); |
109 | kunmap_atomic(mem); | |
110 | len -= chunk; | |
111 | off = 0; | |
112 | page++; | |
9dc6488e | 113 | pmem_addr += chunk; |
98cc093c | 114 | } |
bd697a80 VV |
115 | } |
116 | ||
4e4cbee9 | 117 | static blk_status_t read_pmem(struct page *page, unsigned int off, |
bd697a80 VV |
118 | void *pmem_addr, unsigned int len) |
119 | { | |
98cc093c | 120 | unsigned int chunk; |
60622d68 | 121 | unsigned long rem; |
98cc093c HY |
122 | void *mem; |
123 | ||
124 | while (len) { | |
125 | mem = kmap_atomic(page); | |
9dc6488e | 126 | chunk = min_t(unsigned int, len, PAGE_SIZE - off); |
60622d68 | 127 | rem = memcpy_mcsafe(mem + off, pmem_addr, chunk); |
98cc093c | 128 | kunmap_atomic(mem); |
60622d68 | 129 | if (rem) |
98cc093c HY |
130 | return BLK_STS_IOERR; |
131 | len -= chunk; | |
132 | off = 0; | |
133 | page++; | |
9dc6488e | 134 | pmem_addr += chunk; |
98cc093c | 135 | } |
4e4cbee9 | 136 | return BLK_STS_OK; |
bd697a80 VV |
137 | } |
138 | ||
4e4cbee9 | 139 | static blk_status_t pmem_do_bvec(struct pmem_device *pmem, struct page *page, |
3f289dcb | 140 | unsigned int len, unsigned int off, unsigned int op, |
9e853f23 RZ |
141 | sector_t sector) |
142 | { | |
4e4cbee9 | 143 | blk_status_t rc = BLK_STS_OK; |
59e64739 | 144 | bool bad_pmem = false; |
32ab0a3f | 145 | phys_addr_t pmem_off = sector * 512 + pmem->data_offset; |
7a9eb206 | 146 | void *pmem_addr = pmem->virt_addr + pmem_off; |
9e853f23 | 147 | |
59e64739 DW |
148 | if (unlikely(is_bad_pmem(&pmem->bb, sector, len))) |
149 | bad_pmem = true; | |
150 | ||
3f289dcb | 151 | if (!op_is_write(op)) { |
59e64739 | 152 | if (unlikely(bad_pmem)) |
4e4cbee9 | 153 | rc = BLK_STS_IOERR; |
b5ebc8ec | 154 | else { |
bd697a80 | 155 | rc = read_pmem(page, off, pmem_addr, len); |
b5ebc8ec DW |
156 | flush_dcache_page(page); |
157 | } | |
9e853f23 | 158 | } else { |
0a370d26 DW |
159 | /* |
160 | * Note that we write the data both before and after | |
161 | * clearing poison. The write before clear poison | |
162 | * handles situations where the latest written data is | |
163 | * preserved and the clear poison operation simply marks | |
164 | * the address range as valid without changing the data. | |
165 | * In this case application software can assume that an | |
166 | * interrupted write will either return the new good | |
167 | * data or an error. | |
168 | * | |
169 | * However, if pmem_clear_poison() leaves the data in an | |
170 | * indeterminate state we need to perform the write | |
171 | * after clear poison. | |
172 | */ | |
9e853f23 | 173 | flush_dcache_page(page); |
bd697a80 | 174 | write_pmem(pmem_addr, page, off, len); |
59e64739 | 175 | if (unlikely(bad_pmem)) { |
3115bb02 | 176 | rc = pmem_clear_poison(pmem, pmem_off, len); |
bd697a80 | 177 | write_pmem(pmem_addr, page, off, len); |
59e64739 | 178 | } |
9e853f23 RZ |
179 | } |
180 | ||
b5ebc8ec | 181 | return rc; |
9e853f23 RZ |
182 | } |
183 | ||
dece1635 | 184 | static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio) |
9e853f23 | 185 | { |
c5d4355d | 186 | int ret = 0; |
4e4cbee9 | 187 | blk_status_t rc = 0; |
f0dc089c DW |
188 | bool do_acct; |
189 | unsigned long start; | |
9e853f23 | 190 | struct bio_vec bvec; |
9e853f23 | 191 | struct bvec_iter iter; |
bd842b8c | 192 | struct pmem_device *pmem = q->queuedata; |
7e267a8c DW |
193 | struct nd_region *nd_region = to_region(pmem); |
194 | ||
d2d6364d | 195 | if (bio->bi_opf & REQ_PREFLUSH) |
c5d4355d | 196 | ret = nvdimm_flush(nd_region, bio); |
9e853f23 | 197 | |
f0dc089c | 198 | do_acct = nd_iostat_start(bio, &start); |
e10624f8 DW |
199 | bio_for_each_segment(bvec, bio, iter) { |
200 | rc = pmem_do_bvec(pmem, bvec.bv_page, bvec.bv_len, | |
3f289dcb | 201 | bvec.bv_offset, bio_op(bio), iter.bi_sector); |
e10624f8 | 202 | if (rc) { |
4e4cbee9 | 203 | bio->bi_status = rc; |
e10624f8 DW |
204 | break; |
205 | } | |
206 | } | |
f0dc089c DW |
207 | if (do_acct) |
208 | nd_iostat_end(bio, start); | |
61031952 | 209 | |
1eff9d32 | 210 | if (bio->bi_opf & REQ_FUA) |
c5d4355d PG |
211 | ret = nvdimm_flush(nd_region, bio); |
212 | ||
213 | if (ret) | |
214 | bio->bi_status = errno_to_blk_status(ret); | |
61031952 | 215 | |
4246a0b6 | 216 | bio_endio(bio); |
dece1635 | 217 | return BLK_QC_T_NONE; |
9e853f23 RZ |
218 | } |
219 | ||
220 | static int pmem_rw_page(struct block_device *bdev, sector_t sector, | |
3f289dcb | 221 | struct page *page, unsigned int op) |
9e853f23 | 222 | { |
bd842b8c | 223 | struct pmem_device *pmem = bdev->bd_queue->queuedata; |
4e4cbee9 | 224 | blk_status_t rc; |
9e853f23 | 225 | |
98cc093c | 226 | rc = pmem_do_bvec(pmem, page, hpage_nr_pages(page) * PAGE_SIZE, |
3f289dcb | 227 | 0, op, sector); |
9e853f23 | 228 | |
e10624f8 DW |
229 | /* |
230 | * The ->rw_page interface is subtle and tricky. The core | |
231 | * retries on any error, so we can only invoke page_endio() in | |
232 | * the successful completion case. Otherwise, we'll see crashes | |
233 | * caused by double completion. | |
234 | */ | |
235 | if (rc == 0) | |
3f289dcb | 236 | page_endio(page, op_is_write(op), 0); |
e10624f8 | 237 | |
4e4cbee9 | 238 | return blk_status_to_errno(rc); |
9e853f23 RZ |
239 | } |
240 | ||
f295e53b | 241 | /* see "strong" declaration in tools/testing/nvdimm/pmem-dax.c */ |
c1d6e828 DW |
242 | __weak long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff, |
243 | long nr_pages, void **kaddr, pfn_t *pfn) | |
9e853f23 | 244 | { |
c1d6e828 | 245 | resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset; |
589e75d1 | 246 | |
c1d6e828 DW |
247 | if (unlikely(is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512, |
248 | PFN_PHYS(nr_pages)))) | |
0a70bd43 | 249 | return -EIO; |
46a590cd HY |
250 | |
251 | if (kaddr) | |
252 | *kaddr = pmem->virt_addr + offset; | |
253 | if (pfn) | |
254 | *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags); | |
9e853f23 | 255 | |
0a70bd43 DW |
256 | /* |
257 | * If badblocks are present, limit known good range to the | |
258 | * requested range. | |
259 | */ | |
260 | if (unlikely(pmem->bb.count)) | |
c1d6e828 DW |
261 | return nr_pages; |
262 | return PHYS_PFN(pmem->size - pmem->pfn_pad - offset); | |
9e853f23 RZ |
263 | } |
264 | ||
265 | static const struct block_device_operations pmem_fops = { | |
266 | .owner = THIS_MODULE, | |
267 | .rw_page = pmem_rw_page, | |
58138820 | 268 | .revalidate_disk = nvdimm_revalidate_disk, |
9e853f23 RZ |
269 | }; |
270 | ||
c1d6e828 DW |
271 | static long pmem_dax_direct_access(struct dax_device *dax_dev, |
272 | pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn) | |
273 | { | |
274 | struct pmem_device *pmem = dax_get_private(dax_dev); | |
275 | ||
276 | return __pmem_direct_access(pmem, pgoff, nr_pages, kaddr, pfn); | |
277 | } | |
278 | ||
52f476a3 DW |
279 | /* |
280 | * Use the 'no check' versions of copy_from_iter_flushcache() and | |
281 | * copy_to_iter_mcsafe() to bypass HARDENED_USERCOPY overhead. Bounds | |
282 | * checking, both file offset and device offset, is handled by | |
283 | * dax_iomap_actor() | |
284 | */ | |
0aed55af DW |
285 | static size_t pmem_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, |
286 | void *addr, size_t bytes, struct iov_iter *i) | |
287 | { | |
52f476a3 | 288 | return _copy_from_iter_flushcache(addr, bytes, i); |
0aed55af DW |
289 | } |
290 | ||
b3a9a0c3 DW |
291 | static size_t pmem_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff, |
292 | void *addr, size_t bytes, struct iov_iter *i) | |
293 | { | |
52f476a3 | 294 | return _copy_to_iter_mcsafe(addr, bytes, i); |
b3a9a0c3 DW |
295 | } |
296 | ||
c1d6e828 DW |
297 | static const struct dax_operations pmem_dax_ops = { |
298 | .direct_access = pmem_dax_direct_access, | |
7bf7eac8 | 299 | .dax_supported = generic_fsdax_supported, |
0aed55af | 300 | .copy_from_iter = pmem_copy_from_iter, |
b3a9a0c3 | 301 | .copy_to_iter = pmem_copy_to_iter, |
c1d6e828 DW |
302 | }; |
303 | ||
6e0c90d6 DW |
304 | static const struct attribute_group *pmem_attribute_groups[] = { |
305 | &dax_attribute_group, | |
306 | NULL, | |
c1d6e828 DW |
307 | }; |
308 | ||
d8668bb0 | 309 | static void pmem_pagemap_cleanup(struct dev_pagemap *pgmap) |
030b99e3 | 310 | { |
d8668bb0 CH |
311 | struct request_queue *q = |
312 | container_of(pgmap->ref, struct request_queue, q_usage_counter); | |
50f44ee7 | 313 | |
030b99e3 DW |
314 | blk_cleanup_queue(q); |
315 | } | |
316 | ||
d8668bb0 | 317 | static void pmem_release_queue(void *pgmap) |
50f44ee7 | 318 | { |
d8668bb0 | 319 | pmem_pagemap_cleanup(pgmap); |
50f44ee7 DW |
320 | } |
321 | ||
d8668bb0 | 322 | static void pmem_pagemap_kill(struct dev_pagemap *pgmap) |
71389703 | 323 | { |
d8668bb0 CH |
324 | struct request_queue *q = |
325 | container_of(pgmap->ref, struct request_queue, q_usage_counter); | |
a95c90f1 | 326 | |
d3b5d352 | 327 | blk_freeze_queue_start(q); |
71389703 DW |
328 | } |
329 | ||
c1d6e828 | 330 | static void pmem_release_disk(void *__pmem) |
030b99e3 | 331 | { |
c1d6e828 DW |
332 | struct pmem_device *pmem = __pmem; |
333 | ||
334 | kill_dax(pmem->dax_dev); | |
335 | put_dax(pmem->dax_dev); | |
336 | del_gendisk(pmem->disk); | |
337 | put_disk(pmem->disk); | |
030b99e3 DW |
338 | } |
339 | ||
1e240e8d | 340 | static const struct dev_pagemap_ops fsdax_pagemap_ops = { |
1e240e8d CH |
341 | .kill = pmem_pagemap_kill, |
342 | .cleanup = pmem_pagemap_cleanup, | |
343 | }; | |
344 | ||
200c79da DW |
345 | static int pmem_attach_disk(struct device *dev, |
346 | struct nd_namespace_common *ndns) | |
9e853f23 | 347 | { |
200c79da | 348 | struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); |
f284a4f2 | 349 | struct nd_region *nd_region = to_nd_region(dev->parent); |
ce7f11a2 | 350 | int nid = dev_to_node(dev), fua; |
200c79da | 351 | struct resource *res = &nsio->res; |
e8d51348 | 352 | struct resource bb_res; |
200c79da | 353 | struct nd_pfn *nd_pfn = NULL; |
c1d6e828 | 354 | struct dax_device *dax_dev; |
200c79da | 355 | struct nd_pfn_sb *pfn_sb; |
9e853f23 | 356 | struct pmem_device *pmem; |
468ded03 | 357 | struct request_queue *q; |
6e0c90d6 | 358 | struct device *gendev; |
200c79da DW |
359 | struct gendisk *disk; |
360 | void *addr; | |
e8d51348 | 361 | int rc; |
fefc1d97 | 362 | unsigned long flags = 0UL; |
e8d51348 CH |
363 | |
364 | pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL); | |
365 | if (!pmem) | |
366 | return -ENOMEM; | |
200c79da | 367 | |
8f4b01fc AK |
368 | rc = devm_namespace_enable(dev, ndns, nd_info_block_reserve()); |
369 | if (rc) | |
370 | return rc; | |
371 | ||
200c79da DW |
372 | /* while nsio_rw_bytes is active, parse a pfn info block if present */ |
373 | if (is_nd_pfn(dev)) { | |
374 | nd_pfn = to_nd_pfn(dev); | |
e8d51348 CH |
375 | rc = nvdimm_setup_pfn(nd_pfn, &pmem->pgmap); |
376 | if (rc) | |
377 | return rc; | |
200c79da DW |
378 | } |
379 | ||
380 | /* we're attaching a block device, disable raw namespace access */ | |
8f4b01fc | 381 | devm_namespace_disable(dev, ndns); |
9e853f23 | 382 | |
200c79da | 383 | dev_set_drvdata(dev, pmem); |
9e853f23 RZ |
384 | pmem->phys_addr = res->start; |
385 | pmem->size = resource_size(res); | |
0b277961 DW |
386 | fua = nvdimm_has_flush(nd_region); |
387 | if (!IS_ENABLED(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) || fua < 0) { | |
61031952 | 388 | dev_warn(dev, "unable to guarantee persistence of writes\n"); |
0b277961 DW |
389 | fua = 0; |
390 | } | |
9e853f23 | 391 | |
947df02d | 392 | if (!devm_request_mem_region(dev, res->start, resource_size(res), |
450c6633 | 393 | dev_name(&ndns->dev))) { |
947df02d | 394 | dev_warn(dev, "could not reserve region %pR\n", res); |
200c79da | 395 | return -EBUSY; |
9e853f23 RZ |
396 | } |
397 | ||
3d745ea5 | 398 | q = blk_alloc_queue(pmem_make_request, dev_to_node(dev)); |
468ded03 | 399 | if (!q) |
200c79da | 400 | return -ENOMEM; |
468ded03 | 401 | |
34c0fd54 | 402 | pmem->pfn_flags = PFN_DEV; |
e8d51348 | 403 | pmem->pgmap.ref = &q->q_usage_counter; |
200c79da | 404 | if (is_nd_pfn(dev)) { |
f6a55e1a CH |
405 | pmem->pgmap.type = MEMORY_DEVICE_FS_DAX; |
406 | pmem->pgmap.ops = &fsdax_pagemap_ops; | |
e8d51348 | 407 | addr = devm_memremap_pages(dev, &pmem->pgmap); |
200c79da DW |
408 | pfn_sb = nd_pfn->pfn_sb; |
409 | pmem->data_offset = le64_to_cpu(pfn_sb->dataoff); | |
e8d51348 CH |
410 | pmem->pfn_pad = resource_size(res) - |
411 | resource_size(&pmem->pgmap.res); | |
200c79da | 412 | pmem->pfn_flags |= PFN_MAP; |
e8d51348 CH |
413 | memcpy(&bb_res, &pmem->pgmap.res, sizeof(bb_res)); |
414 | bb_res.start += pmem->data_offset; | |
200c79da | 415 | } else if (pmem_should_map_pages(dev)) { |
e8d51348 | 416 | memcpy(&pmem->pgmap.res, &nsio->res, sizeof(pmem->pgmap.res)); |
f6a55e1a CH |
417 | pmem->pgmap.type = MEMORY_DEVICE_FS_DAX; |
418 | pmem->pgmap.ops = &fsdax_pagemap_ops; | |
e8d51348 | 419 | addr = devm_memremap_pages(dev, &pmem->pgmap); |
34c0fd54 | 420 | pmem->pfn_flags |= PFN_MAP; |
e8d51348 | 421 | memcpy(&bb_res, &pmem->pgmap.res, sizeof(bb_res)); |
91ed7ac4 | 422 | } else { |
50f44ee7 | 423 | if (devm_add_action_or_reset(dev, pmem_release_queue, |
d8668bb0 | 424 | &pmem->pgmap)) |
50f44ee7 | 425 | return -ENOMEM; |
200c79da DW |
426 | addr = devm_memremap(dev, pmem->phys_addr, |
427 | pmem->size, ARCH_MEMREMAP_PMEM); | |
91ed7ac4 DW |
428 | memcpy(&bb_res, &nsio->res, sizeof(bb_res)); |
429 | } | |
b36f4761 | 430 | |
200c79da DW |
431 | if (IS_ERR(addr)) |
432 | return PTR_ERR(addr); | |
7a9eb206 | 433 | pmem->virt_addr = addr; |
9e853f23 | 434 | |
ce7f11a2 | 435 | blk_queue_write_cache(q, true, fua); |
5a92289f | 436 | blk_queue_physical_block_size(q, PAGE_SIZE); |
f979b13c | 437 | blk_queue_logical_block_size(q, pmem_sector_size(ndns)); |
5a92289f | 438 | blk_queue_max_hw_sectors(q, UINT_MAX); |
8b904b5b | 439 | blk_queue_flag_set(QUEUE_FLAG_NONROT, q); |
4557641b RZ |
440 | if (pmem->pfn_flags & PFN_MAP) |
441 | blk_queue_flag_set(QUEUE_FLAG_DAX, q); | |
5a92289f | 442 | q->queuedata = pmem; |
9e853f23 | 443 | |
538ea4aa | 444 | disk = alloc_disk_node(0, nid); |
030b99e3 DW |
445 | if (!disk) |
446 | return -ENOMEM; | |
c1d6e828 | 447 | pmem->disk = disk; |
9e853f23 | 448 | |
9e853f23 | 449 | disk->fops = &pmem_fops; |
5a92289f | 450 | disk->queue = q; |
9e853f23 | 451 | disk->flags = GENHD_FL_EXT_DEVT; |
23c47d2a | 452 | disk->queue->backing_dev_info->capabilities |= BDI_CAP_SYNCHRONOUS_IO; |
5212e11f | 453 | nvdimm_namespace_disk_name(ndns, disk->disk_name); |
cfe30b87 DW |
454 | set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset) |
455 | / 512); | |
b95f5f43 DW |
456 | if (devm_init_badblocks(dev, &pmem->bb)) |
457 | return -ENOMEM; | |
e8d51348 | 458 | nvdimm_badblocks_populate(nd_region, &pmem->bb, &bb_res); |
57f7f317 | 459 | disk->bb = &pmem->bb; |
f02716db | 460 | |
fefc1d97 PG |
461 | if (is_nvdimm_sync(nd_region)) |
462 | flags = DAXDEV_F_SYNC; | |
463 | dax_dev = alloc_dax(pmem, disk->disk_name, &pmem_dax_ops, flags); | |
c1d6e828 DW |
464 | if (!dax_dev) { |
465 | put_disk(disk); | |
466 | return -ENOMEM; | |
467 | } | |
ce7f11a2 | 468 | dax_write_cache(dax_dev, nvdimm_has_cache(nd_region)); |
c1d6e828 | 469 | pmem->dax_dev = dax_dev; |
6e0c90d6 DW |
470 | gendev = disk_to_dev(disk); |
471 | gendev->groups = pmem_attribute_groups; | |
472 | ||
fef912bf | 473 | device_add_disk(dev, disk, NULL); |
c1d6e828 | 474 | if (devm_add_action_or_reset(dev, pmem_release_disk, pmem)) |
f02716db DW |
475 | return -ENOMEM; |
476 | ||
58138820 | 477 | revalidate_disk(disk); |
9e853f23 | 478 | |
975750a9 TK |
479 | pmem->bb_state = sysfs_get_dirent(disk_to_dev(disk)->kobj.sd, |
480 | "badblocks"); | |
6aa734a2 DW |
481 | if (!pmem->bb_state) |
482 | dev_warn(dev, "'badblocks' notification disabled\n"); | |
975750a9 | 483 | |
8c2f7e86 DW |
484 | return 0; |
485 | } | |
9e853f23 | 486 | |
9f53f9fa | 487 | static int nd_pmem_probe(struct device *dev) |
9e853f23 | 488 | { |
1c97afa7 | 489 | int ret; |
8c2f7e86 | 490 | struct nd_namespace_common *ndns; |
9e853f23 | 491 | |
8c2f7e86 DW |
492 | ndns = nvdimm_namespace_common_probe(dev); |
493 | if (IS_ERR(ndns)) | |
494 | return PTR_ERR(ndns); | |
bf9bccc1 | 495 | |
200c79da | 496 | if (is_nd_btt(dev)) |
708ab62b CH |
497 | return nvdimm_namespace_attach_btt(ndns); |
498 | ||
32ab0a3f | 499 | if (is_nd_pfn(dev)) |
200c79da | 500 | return pmem_attach_disk(dev, ndns); |
32ab0a3f | 501 | |
8f4b01fc AK |
502 | ret = devm_namespace_enable(dev, ndns, nd_info_block_reserve()); |
503 | if (ret) | |
504 | return ret; | |
505 | ||
1c97afa7 AK |
506 | ret = nd_btt_probe(dev, ndns); |
507 | if (ret == 0) | |
32ab0a3f | 508 | return -ENXIO; |
32ab0a3f | 509 | |
1c97afa7 AK |
510 | /* |
511 | * We have two failure conditions here, there is no | |
512 | * info reserver block or we found a valid info reserve block | |
513 | * but failed to initialize the pfn superblock. | |
514 | * | |
515 | * For the first case consider namespace as a raw pmem namespace | |
516 | * and attach a disk. | |
517 | * | |
518 | * For the latter, consider this a success and advance the namespace | |
519 | * seed. | |
520 | */ | |
521 | ret = nd_pfn_probe(dev, ndns); | |
522 | if (ret == 0) | |
523 | return -ENXIO; | |
524 | else if (ret == -EOPNOTSUPP) | |
525 | return ret; | |
526 | ||
527 | ret = nd_dax_probe(dev, ndns); | |
528 | if (ret == 0) | |
529 | return -ENXIO; | |
530 | else if (ret == -EOPNOTSUPP) | |
531 | return ret; | |
8f4b01fc AK |
532 | |
533 | /* probe complete, attach handles namespace enabling */ | |
534 | devm_namespace_disable(dev, ndns); | |
535 | ||
200c79da | 536 | return pmem_attach_disk(dev, ndns); |
9e853f23 RZ |
537 | } |
538 | ||
9f53f9fa | 539 | static int nd_pmem_remove(struct device *dev) |
9e853f23 | 540 | { |
6aa734a2 DW |
541 | struct pmem_device *pmem = dev_get_drvdata(dev); |
542 | ||
8c2f7e86 | 543 | if (is_nd_btt(dev)) |
298f2bc5 | 544 | nvdimm_namespace_detach_btt(to_nd_btt(dev)); |
6aa734a2 DW |
545 | else { |
546 | /* | |
87a30e1f DW |
547 | * Note, this assumes nd_device_lock() context to not |
548 | * race nd_pmem_notify() | |
6aa734a2 DW |
549 | */ |
550 | sysfs_put(pmem->bb_state); | |
551 | pmem->bb_state = NULL; | |
552 | } | |
c5d4355d | 553 | nvdimm_flush(to_nd_region(dev->parent), NULL); |
476f848a | 554 | |
9e853f23 RZ |
555 | return 0; |
556 | } | |
557 | ||
476f848a DW |
558 | static void nd_pmem_shutdown(struct device *dev) |
559 | { | |
c5d4355d | 560 | nvdimm_flush(to_nd_region(dev->parent), NULL); |
476f848a DW |
561 | } |
562 | ||
71999466 DW |
563 | static void nd_pmem_notify(struct device *dev, enum nvdimm_event event) |
564 | { | |
b2518c78 | 565 | struct nd_region *nd_region; |
298f2bc5 DW |
566 | resource_size_t offset = 0, end_trunc = 0; |
567 | struct nd_namespace_common *ndns; | |
568 | struct nd_namespace_io *nsio; | |
569 | struct resource res; | |
b2518c78 | 570 | struct badblocks *bb; |
975750a9 | 571 | struct kernfs_node *bb_state; |
71999466 DW |
572 | |
573 | if (event != NVDIMM_REVALIDATE_POISON) | |
574 | return; | |
575 | ||
298f2bc5 DW |
576 | if (is_nd_btt(dev)) { |
577 | struct nd_btt *nd_btt = to_nd_btt(dev); | |
578 | ||
579 | ndns = nd_btt->ndns; | |
b2518c78 TK |
580 | nd_region = to_nd_region(ndns->dev.parent); |
581 | nsio = to_nd_namespace_io(&ndns->dev); | |
582 | bb = &nsio->bb; | |
975750a9 | 583 | bb_state = NULL; |
b2518c78 TK |
584 | } else { |
585 | struct pmem_device *pmem = dev_get_drvdata(dev); | |
a3901802 | 586 | |
b2518c78 TK |
587 | nd_region = to_region(pmem); |
588 | bb = &pmem->bb; | |
975750a9 | 589 | bb_state = pmem->bb_state; |
b2518c78 TK |
590 | |
591 | if (is_nd_pfn(dev)) { | |
592 | struct nd_pfn *nd_pfn = to_nd_pfn(dev); | |
593 | struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb; | |
594 | ||
595 | ndns = nd_pfn->ndns; | |
596 | offset = pmem->data_offset + | |
597 | __le32_to_cpu(pfn_sb->start_pad); | |
598 | end_trunc = __le32_to_cpu(pfn_sb->end_trunc); | |
599 | } else { | |
600 | ndns = to_ndns(dev); | |
601 | } | |
602 | ||
603 | nsio = to_nd_namespace_io(&ndns->dev); | |
604 | } | |
a3901802 | 605 | |
298f2bc5 DW |
606 | res.start = nsio->res.start + offset; |
607 | res.end = nsio->res.end - end_trunc; | |
b2518c78 | 608 | nvdimm_badblocks_populate(nd_region, bb, &res); |
975750a9 TK |
609 | if (bb_state) |
610 | sysfs_notify_dirent(bb_state); | |
71999466 DW |
611 | } |
612 | ||
9f53f9fa DW |
613 | MODULE_ALIAS("pmem"); |
614 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO); | |
bf9bccc1 | 615 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM); |
9f53f9fa DW |
616 | static struct nd_device_driver nd_pmem_driver = { |
617 | .probe = nd_pmem_probe, | |
618 | .remove = nd_pmem_remove, | |
71999466 | 619 | .notify = nd_pmem_notify, |
476f848a | 620 | .shutdown = nd_pmem_shutdown, |
9f53f9fa DW |
621 | .drv = { |
622 | .name = "nd_pmem", | |
9e853f23 | 623 | }, |
bf9bccc1 | 624 | .type = ND_DRIVER_NAMESPACE_IO | ND_DRIVER_NAMESPACE_PMEM, |
9e853f23 RZ |
625 | }; |
626 | ||
03e90843 | 627 | module_nd_driver(nd_pmem_driver); |
9e853f23 RZ |
628 | |
629 | MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>"); | |
630 | MODULE_LICENSE("GPL v2"); |