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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 | ||
9e853f23 | 10 | #include <linux/blkdev.h> |
4ee60ec1 | 11 | #include <linux/pagemap.h> |
9e853f23 RZ |
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> |
44f23dab | 20 | #include <linux/kstrtox.h> |
32ab0a3f | 21 | #include <linux/vmalloc.h> |
71389703 | 22 | #include <linux/blk-mq.h> |
34c0fd54 | 23 | #include <linux/pfn_t.h> |
9e853f23 | 24 | #include <linux/slab.h> |
0aed55af | 25 | #include <linux/uio.h> |
c1d6e828 | 26 | #include <linux/dax.h> |
9f53f9fa | 27 | #include <linux/nd.h> |
e0cf615d CH |
28 | #include <linux/mm.h> |
29 | #include <asm/cacheflush.h> | |
f295e53b | 30 | #include "pmem.h" |
2361db89 | 31 | #include "btt.h" |
32ab0a3f | 32 | #include "pfn.h" |
9f53f9fa | 33 | #include "nd.h" |
9e853f23 | 34 | |
f284a4f2 DW |
35 | static struct device *to_dev(struct pmem_device *pmem) |
36 | { | |
37 | /* | |
38 | * nvdimm bus services need a 'dev' parameter, and we record the device | |
39 | * at init in bb.dev. | |
40 | */ | |
41 | return pmem->bb.dev; | |
42 | } | |
43 | ||
44 | static struct nd_region *to_region(struct pmem_device *pmem) | |
45 | { | |
46 | return to_nd_region(to_dev(pmem)->parent); | |
47 | } | |
9e853f23 | 48 | |
149d1714 | 49 | static phys_addr_t pmem_to_phys(struct pmem_device *pmem, phys_addr_t offset) |
c953cc98 | 50 | { |
9409c9b6 JC |
51 | return pmem->phys_addr + offset; |
52 | } | |
53 | ||
54 | static sector_t to_sect(struct pmem_device *pmem, phys_addr_t offset) | |
55 | { | |
56 | return (offset - pmem->data_offset) >> SECTOR_SHIFT; | |
57 | } | |
58 | ||
59 | static phys_addr_t to_offset(struct pmem_device *pmem, sector_t sector) | |
60 | { | |
61 | return (sector << SECTOR_SHIFT) + pmem->data_offset; | |
62 | } | |
63 | ||
64 | static void pmem_mkpage_present(struct pmem_device *pmem, phys_addr_t offset, | |
65 | unsigned int len) | |
66 | { | |
149d1714 | 67 | phys_addr_t phys = pmem_to_phys(pmem, offset); |
c953cc98 DW |
68 | unsigned long pfn_start, pfn_end, pfn; |
69 | ||
70 | /* only pmem in the linear map supports HWPoison */ | |
71 | if (is_vmalloc_addr(pmem->virt_addr)) | |
72 | return; | |
73 | ||
74 | pfn_start = PHYS_PFN(phys); | |
75 | pfn_end = pfn_start + PHYS_PFN(len); | |
76 | for (pfn = pfn_start; pfn < pfn_end; pfn++) { | |
77 | struct page *page = pfn_to_page(pfn); | |
78 | ||
79 | /* | |
80 | * Note, no need to hold a get_dev_pagemap() reference | |
81 | * here since we're in the driver I/O path and | |
82 | * outstanding I/O requests pin the dev_pagemap. | |
83 | */ | |
84 | if (test_and_clear_pmem_poison(page)) | |
85 | clear_mce_nospec(pfn); | |
86 | } | |
87 | } | |
88 | ||
9409c9b6 | 89 | static void pmem_clear_bb(struct pmem_device *pmem, sector_t sector, long blks) |
59e64739 | 90 | { |
9409c9b6 JC |
91 | if (blks == 0) |
92 | return; | |
93 | badblocks_clear(&pmem->bb, sector, blks); | |
94 | if (pmem->bb_state) | |
95 | sysfs_notify_dirent(pmem->bb_state); | |
96 | } | |
59e64739 | 97 | |
9409c9b6 JC |
98 | static long __pmem_clear_poison(struct pmem_device *pmem, |
99 | phys_addr_t offset, unsigned int len) | |
100 | { | |
149d1714 | 101 | phys_addr_t phys = pmem_to_phys(pmem, offset); |
9409c9b6 | 102 | long cleared = nvdimm_clear_poison(to_dev(pmem), phys, len); |
59e64739 | 103 | |
9409c9b6 JC |
104 | if (cleared > 0) { |
105 | pmem_mkpage_present(pmem, offset, cleared); | |
106 | arch_invalidate_pmem(pmem->virt_addr + offset, len); | |
59e64739 | 107 | } |
9409c9b6 JC |
108 | return cleared; |
109 | } | |
3115bb02 | 110 | |
9409c9b6 JC |
111 | static blk_status_t pmem_clear_poison(struct pmem_device *pmem, |
112 | phys_addr_t offset, unsigned int len) | |
113 | { | |
114 | long cleared = __pmem_clear_poison(pmem, offset, len); | |
868f036f | 115 | |
9409c9b6 JC |
116 | if (cleared < 0) |
117 | return BLK_STS_IOERR; | |
118 | ||
119 | pmem_clear_bb(pmem, to_sect(pmem, offset), cleared >> SECTOR_SHIFT); | |
120 | if (cleared < len) | |
121 | return BLK_STS_IOERR; | |
122 | return BLK_STS_OK; | |
59e64739 DW |
123 | } |
124 | ||
bd697a80 VV |
125 | static void write_pmem(void *pmem_addr, struct page *page, |
126 | unsigned int off, unsigned int len) | |
127 | { | |
98cc093c HY |
128 | unsigned int chunk; |
129 | void *mem; | |
130 | ||
131 | while (len) { | |
132 | mem = kmap_atomic(page); | |
9dc6488e | 133 | chunk = min_t(unsigned int, len, PAGE_SIZE - off); |
98cc093c HY |
134 | memcpy_flushcache(pmem_addr, mem + off, chunk); |
135 | kunmap_atomic(mem); | |
136 | len -= chunk; | |
137 | off = 0; | |
138 | page++; | |
9dc6488e | 139 | pmem_addr += chunk; |
98cc093c | 140 | } |
bd697a80 VV |
141 | } |
142 | ||
4e4cbee9 | 143 | static blk_status_t read_pmem(struct page *page, unsigned int off, |
bd697a80 VV |
144 | void *pmem_addr, unsigned int len) |
145 | { | |
98cc093c | 146 | unsigned int chunk; |
60622d68 | 147 | unsigned long rem; |
98cc093c HY |
148 | void *mem; |
149 | ||
150 | while (len) { | |
151 | mem = kmap_atomic(page); | |
9dc6488e | 152 | chunk = min_t(unsigned int, len, PAGE_SIZE - off); |
ec6347bb | 153 | rem = copy_mc_to_kernel(mem + off, pmem_addr, chunk); |
98cc093c | 154 | kunmap_atomic(mem); |
60622d68 | 155 | if (rem) |
98cc093c HY |
156 | return BLK_STS_IOERR; |
157 | len -= chunk; | |
158 | off = 0; | |
159 | page++; | |
9dc6488e | 160 | pmem_addr += chunk; |
98cc093c | 161 | } |
4e4cbee9 | 162 | return BLK_STS_OK; |
bd697a80 VV |
163 | } |
164 | ||
5d64efe7 VG |
165 | static blk_status_t pmem_do_read(struct pmem_device *pmem, |
166 | struct page *page, unsigned int page_off, | |
167 | sector_t sector, unsigned int len) | |
168 | { | |
169 | blk_status_t rc; | |
9409c9b6 | 170 | phys_addr_t pmem_off = to_offset(pmem, sector); |
5d64efe7 VG |
171 | void *pmem_addr = pmem->virt_addr + pmem_off; |
172 | ||
173 | if (unlikely(is_bad_pmem(&pmem->bb, sector, len))) | |
174 | return BLK_STS_IOERR; | |
175 | ||
176 | rc = read_pmem(page, page_off, pmem_addr, len); | |
177 | flush_dcache_page(page); | |
178 | return rc; | |
179 | } | |
180 | ||
181 | static blk_status_t pmem_do_write(struct pmem_device *pmem, | |
182 | struct page *page, unsigned int page_off, | |
183 | sector_t sector, unsigned int len) | |
9e853f23 | 184 | { |
9409c9b6 | 185 | phys_addr_t pmem_off = to_offset(pmem, sector); |
7a9eb206 | 186 | void *pmem_addr = pmem->virt_addr + pmem_off; |
9e853f23 | 187 | |
5898b43a JC |
188 | if (unlikely(is_bad_pmem(&pmem->bb, sector, len))) { |
189 | blk_status_t rc = pmem_clear_poison(pmem, pmem_off, len); | |
190 | ||
191 | if (rc != BLK_STS_OK) | |
192 | return rc; | |
193 | } | |
59e64739 | 194 | |
5d64efe7 VG |
195 | flush_dcache_page(page); |
196 | write_pmem(pmem_addr, page, page_off, len); | |
9e853f23 | 197 | |
5898b43a | 198 | return BLK_STS_OK; |
9e853f23 RZ |
199 | } |
200 | ||
3e08773c | 201 | static void pmem_submit_bio(struct bio *bio) |
9e853f23 | 202 | { |
c5d4355d | 203 | int ret = 0; |
4e4cbee9 | 204 | blk_status_t rc = 0; |
f0dc089c DW |
205 | bool do_acct; |
206 | unsigned long start; | |
9e853f23 | 207 | struct bio_vec bvec; |
9e853f23 | 208 | struct bvec_iter iter; |
309dca30 | 209 | struct pmem_device *pmem = bio->bi_bdev->bd_disk->private_data; |
7e267a8c DW |
210 | struct nd_region *nd_region = to_region(pmem); |
211 | ||
d2d6364d | 212 | if (bio->bi_opf & REQ_PREFLUSH) |
c5d4355d | 213 | ret = nvdimm_flush(nd_region, bio); |
9e853f23 | 214 | |
309dca30 | 215 | do_acct = blk_queue_io_stat(bio->bi_bdev->bd_disk->queue); |
0fd92f89 CH |
216 | if (do_acct) |
217 | start = bio_start_io_acct(bio); | |
e10624f8 | 218 | bio_for_each_segment(bvec, bio, iter) { |
5d64efe7 VG |
219 | if (op_is_write(bio_op(bio))) |
220 | rc = pmem_do_write(pmem, bvec.bv_page, bvec.bv_offset, | |
221 | iter.bi_sector, bvec.bv_len); | |
222 | else | |
223 | rc = pmem_do_read(pmem, bvec.bv_page, bvec.bv_offset, | |
224 | iter.bi_sector, bvec.bv_len); | |
e10624f8 | 225 | if (rc) { |
4e4cbee9 | 226 | bio->bi_status = rc; |
e10624f8 DW |
227 | break; |
228 | } | |
229 | } | |
f0dc089c | 230 | if (do_acct) |
0fd92f89 | 231 | bio_end_io_acct(bio, start); |
61031952 | 232 | |
1eff9d32 | 233 | if (bio->bi_opf & REQ_FUA) |
c5d4355d PG |
234 | ret = nvdimm_flush(nd_region, bio); |
235 | ||
236 | if (ret) | |
237 | bio->bi_status = errno_to_blk_status(ret); | |
61031952 | 238 | |
4246a0b6 | 239 | bio_endio(bio); |
9e853f23 RZ |
240 | } |
241 | ||
f295e53b | 242 | /* see "strong" declaration in tools/testing/nvdimm/pmem-dax.c */ |
c1d6e828 | 243 | __weak long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff, |
e511c4a3 JC |
244 | long nr_pages, enum dax_access_mode mode, void **kaddr, |
245 | pfn_t *pfn) | |
9e853f23 | 246 | { |
c1d6e828 | 247 | resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset; |
f42e8e50 JC |
248 | sector_t sector = PFN_PHYS(pgoff) >> SECTOR_SHIFT; |
249 | unsigned int num = PFN_PHYS(nr_pages) >> SECTOR_SHIFT; | |
250 | struct badblocks *bb = &pmem->bb; | |
251 | sector_t first_bad; | |
252 | int num_bad; | |
46a590cd HY |
253 | |
254 | if (kaddr) | |
255 | *kaddr = pmem->virt_addr + offset; | |
256 | if (pfn) | |
257 | *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags); | |
9e853f23 | 258 | |
f42e8e50 JC |
259 | if (bb->count && |
260 | badblocks_check(bb, sector, num, &first_bad, &num_bad)) { | |
261 | long actual_nr; | |
262 | ||
263 | if (mode != DAX_RECOVERY_WRITE) | |
1ea7ca1b | 264 | return -EHWPOISON; |
f42e8e50 JC |
265 | |
266 | /* | |
267 | * Set the recovery stride is set to kernel page size because | |
268 | * the underlying driver and firmware clear poison functions | |
269 | * don't appear to handle large chunk(such as 2MiB) reliably. | |
270 | */ | |
271 | actual_nr = PHYS_PFN( | |
272 | PAGE_ALIGN((first_bad - sector) << SECTOR_SHIFT)); | |
273 | dev_dbg(pmem->bb.dev, "start sector(%llu), nr_pages(%ld), first_bad(%llu), actual_nr(%ld)\n", | |
274 | sector, nr_pages, first_bad, actual_nr); | |
275 | if (actual_nr) | |
276 | return actual_nr; | |
277 | return 1; | |
278 | } | |
279 | ||
0a70bd43 | 280 | /* |
f42e8e50 JC |
281 | * If badblocks are present but not in the range, limit known good range |
282 | * to the requested range. | |
0a70bd43 | 283 | */ |
f42e8e50 | 284 | if (bb->count) |
c1d6e828 DW |
285 | return nr_pages; |
286 | return PHYS_PFN(pmem->size - pmem->pfn_pad - offset); | |
9e853f23 RZ |
287 | } |
288 | ||
289 | static const struct block_device_operations pmem_fops = { | |
290 | .owner = THIS_MODULE, | |
c62b37d9 | 291 | .submit_bio = pmem_submit_bio, |
9e853f23 RZ |
292 | }; |
293 | ||
f605a263 VG |
294 | static int pmem_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff, |
295 | size_t nr_pages) | |
296 | { | |
297 | struct pmem_device *pmem = dax_get_private(dax_dev); | |
298 | ||
299 | return blk_status_to_errno(pmem_do_write(pmem, ZERO_PAGE(0), 0, | |
300 | PFN_PHYS(pgoff) >> SECTOR_SHIFT, | |
301 | PAGE_SIZE)); | |
302 | } | |
303 | ||
c1d6e828 | 304 | static long pmem_dax_direct_access(struct dax_device *dax_dev, |
e511c4a3 JC |
305 | pgoff_t pgoff, long nr_pages, enum dax_access_mode mode, |
306 | void **kaddr, pfn_t *pfn) | |
c1d6e828 DW |
307 | { |
308 | struct pmem_device *pmem = dax_get_private(dax_dev); | |
309 | ||
e511c4a3 | 310 | return __pmem_direct_access(pmem, pgoff, nr_pages, mode, kaddr, pfn); |
c1d6e828 DW |
311 | } |
312 | ||
f42e8e50 JC |
313 | /* |
314 | * The recovery write thread started out as a normal pwrite thread and | |
315 | * when the filesystem was told about potential media error in the | |
316 | * range, filesystem turns the normal pwrite to a dax_recovery_write. | |
317 | * | |
318 | * The recovery write consists of clearing media poison, clearing page | |
319 | * HWPoison bit, reenable page-wide read-write permission, flush the | |
320 | * caches and finally write. A competing pread thread will be held | |
321 | * off during the recovery process since data read back might not be | |
322 | * valid, and this is achieved by clearing the badblock records after | |
323 | * the recovery write is complete. Competing recovery write threads | |
324 | * are already serialized by writer lock held by dax_iomap_rw(). | |
325 | */ | |
047218ec JC |
326 | static size_t pmem_recovery_write(struct dax_device *dax_dev, pgoff_t pgoff, |
327 | void *addr, size_t bytes, struct iov_iter *i) | |
328 | { | |
f42e8e50 JC |
329 | struct pmem_device *pmem = dax_get_private(dax_dev); |
330 | size_t olen, len, off; | |
331 | phys_addr_t pmem_off; | |
332 | struct device *dev = pmem->bb.dev; | |
333 | long cleared; | |
334 | ||
335 | off = offset_in_page(addr); | |
336 | len = PFN_PHYS(PFN_UP(off + bytes)); | |
337 | if (!is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) >> SECTOR_SHIFT, len)) | |
338 | return _copy_from_iter_flushcache(addr, bytes, i); | |
339 | ||
340 | /* | |
341 | * Not page-aligned range cannot be recovered. This should not | |
342 | * happen unless something else went wrong. | |
343 | */ | |
344 | if (off || !PAGE_ALIGNED(bytes)) { | |
345 | dev_dbg(dev, "Found poison, but addr(%p) or bytes(%#zx) not page aligned\n", | |
346 | addr, bytes); | |
347 | return 0; | |
348 | } | |
349 | ||
350 | pmem_off = PFN_PHYS(pgoff) + pmem->data_offset; | |
351 | cleared = __pmem_clear_poison(pmem, pmem_off, len); | |
352 | if (cleared > 0 && cleared < len) { | |
353 | dev_dbg(dev, "poison cleared only %ld out of %zu bytes\n", | |
354 | cleared, len); | |
355 | return 0; | |
356 | } | |
357 | if (cleared < 0) { | |
358 | dev_dbg(dev, "poison clear failed: %ld\n", cleared); | |
359 | return 0; | |
360 | } | |
361 | ||
362 | olen = _copy_from_iter_flushcache(addr, bytes, i); | |
363 | pmem_clear_bb(pmem, to_sect(pmem, pmem_off), cleared >> SECTOR_SHIFT); | |
364 | ||
365 | return olen; | |
047218ec JC |
366 | } |
367 | ||
c1d6e828 DW |
368 | static const struct dax_operations pmem_dax_ops = { |
369 | .direct_access = pmem_dax_direct_access, | |
f605a263 | 370 | .zero_page_range = pmem_dax_zero_page_range, |
047218ec | 371 | .recovery_write = pmem_recovery_write, |
c1d6e828 DW |
372 | }; |
373 | ||
e765f13e CH |
374 | static ssize_t write_cache_show(struct device *dev, |
375 | struct device_attribute *attr, char *buf) | |
376 | { | |
377 | struct pmem_device *pmem = dev_to_disk(dev)->private_data; | |
378 | ||
379 | return sprintf(buf, "%d\n", !!dax_write_cache_enabled(pmem->dax_dev)); | |
380 | } | |
381 | ||
382 | static ssize_t write_cache_store(struct device *dev, | |
383 | struct device_attribute *attr, const char *buf, size_t len) | |
384 | { | |
385 | struct pmem_device *pmem = dev_to_disk(dev)->private_data; | |
386 | bool write_cache; | |
387 | int rc; | |
388 | ||
44f23dab | 389 | rc = kstrtobool(buf, &write_cache); |
e765f13e CH |
390 | if (rc) |
391 | return rc; | |
392 | dax_write_cache(pmem->dax_dev, write_cache); | |
393 | return len; | |
394 | } | |
395 | static DEVICE_ATTR_RW(write_cache); | |
396 | ||
397 | static umode_t dax_visible(struct kobject *kobj, struct attribute *a, int n) | |
398 | { | |
399 | #ifndef CONFIG_ARCH_HAS_PMEM_API | |
400 | if (a == &dev_attr_write_cache.attr) | |
401 | return 0; | |
402 | #endif | |
403 | return a->mode; | |
404 | } | |
405 | ||
406 | static struct attribute *dax_attributes[] = { | |
407 | &dev_attr_write_cache.attr, | |
408 | NULL, | |
409 | }; | |
410 | ||
411 | static const struct attribute_group dax_attribute_group = { | |
412 | .name = "dax", | |
413 | .attrs = dax_attributes, | |
414 | .is_visible = dax_visible, | |
415 | }; | |
416 | ||
6e0c90d6 DW |
417 | static const struct attribute_group *pmem_attribute_groups[] = { |
418 | &dax_attribute_group, | |
419 | NULL, | |
c1d6e828 DW |
420 | }; |
421 | ||
c1d6e828 | 422 | static void pmem_release_disk(void *__pmem) |
030b99e3 | 423 | { |
c1d6e828 DW |
424 | struct pmem_device *pmem = __pmem; |
425 | ||
fb08a190 | 426 | dax_remove_host(pmem->disk); |
c1d6e828 DW |
427 | kill_dax(pmem->dax_dev); |
428 | put_dax(pmem->dax_dev); | |
429 | del_gendisk(pmem->disk); | |
030b99e3 | 430 | |
8b9ab626 | 431 | put_disk(pmem->disk); |
3dd60fb9 | 432 | } |
1e240e8d | 433 | |
33a8f7f2 SR |
434 | static int pmem_pagemap_memory_failure(struct dev_pagemap *pgmap, |
435 | unsigned long pfn, unsigned long nr_pages, int mf_flags) | |
436 | { | |
437 | struct pmem_device *pmem = | |
438 | container_of(pgmap, struct pmem_device, pgmap); | |
439 | u64 offset = PFN_PHYS(pfn) - pmem->phys_addr - pmem->data_offset; | |
440 | u64 len = nr_pages << PAGE_SHIFT; | |
441 | ||
442 | return dax_holder_notify_failure(pmem->dax_dev, offset, len, mf_flags); | |
443 | } | |
444 | ||
445 | static const struct dev_pagemap_ops fsdax_pagemap_ops = { | |
446 | .memory_failure = pmem_pagemap_memory_failure, | |
447 | }; | |
448 | ||
200c79da DW |
449 | static int pmem_attach_disk(struct device *dev, |
450 | struct nd_namespace_common *ndns) | |
9e853f23 | 451 | { |
200c79da | 452 | struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); |
f284a4f2 | 453 | struct nd_region *nd_region = to_nd_region(dev->parent); |
c3d9c303 CH |
454 | struct queue_limits lim = { |
455 | .logical_block_size = pmem_sector_size(ndns), | |
456 | .physical_block_size = PAGE_SIZE, | |
457 | .max_hw_sectors = UINT_MAX, | |
458 | }; | |
ce7f11a2 | 459 | int nid = dev_to_node(dev), fua; |
200c79da | 460 | struct resource *res = &nsio->res; |
a4574f63 | 461 | struct range bb_range; |
200c79da | 462 | struct nd_pfn *nd_pfn = NULL; |
c1d6e828 | 463 | struct dax_device *dax_dev; |
200c79da | 464 | struct nd_pfn_sb *pfn_sb; |
9e853f23 | 465 | struct pmem_device *pmem; |
468ded03 | 466 | struct request_queue *q; |
200c79da DW |
467 | struct gendisk *disk; |
468 | void *addr; | |
e8d51348 CH |
469 | int rc; |
470 | ||
471 | pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL); | |
472 | if (!pmem) | |
473 | return -ENOMEM; | |
200c79da | 474 | |
8f4b01fc AK |
475 | rc = devm_namespace_enable(dev, ndns, nd_info_block_reserve()); |
476 | if (rc) | |
477 | return rc; | |
478 | ||
200c79da DW |
479 | /* while nsio_rw_bytes is active, parse a pfn info block if present */ |
480 | if (is_nd_pfn(dev)) { | |
481 | nd_pfn = to_nd_pfn(dev); | |
e8d51348 CH |
482 | rc = nvdimm_setup_pfn(nd_pfn, &pmem->pgmap); |
483 | if (rc) | |
484 | return rc; | |
200c79da DW |
485 | } |
486 | ||
487 | /* we're attaching a block device, disable raw namespace access */ | |
8f4b01fc | 488 | devm_namespace_disable(dev, ndns); |
9e853f23 | 489 | |
200c79da | 490 | dev_set_drvdata(dev, pmem); |
9e853f23 RZ |
491 | pmem->phys_addr = res->start; |
492 | pmem->size = resource_size(res); | |
0b277961 DW |
493 | fua = nvdimm_has_flush(nd_region); |
494 | if (!IS_ENABLED(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) || fua < 0) { | |
61031952 | 495 | dev_warn(dev, "unable to guarantee persistence of writes\n"); |
0b277961 DW |
496 | fua = 0; |
497 | } | |
9e853f23 | 498 | |
947df02d | 499 | if (!devm_request_mem_region(dev, res->start, resource_size(res), |
450c6633 | 500 | dev_name(&ndns->dev))) { |
947df02d | 501 | dev_warn(dev, "could not reserve region %pR\n", res); |
200c79da | 502 | return -EBUSY; |
9e853f23 RZ |
503 | } |
504 | ||
c3d9c303 | 505 | disk = blk_alloc_disk(&lim, nid); |
74fa8f9c CH |
506 | if (IS_ERR(disk)) |
507 | return PTR_ERR(disk); | |
87eb73b2 | 508 | q = disk->queue; |
468ded03 | 509 | |
87eb73b2 | 510 | pmem->disk = disk; |
a624eb52 | 511 | pmem->pgmap.owner = pmem; |
34c0fd54 | 512 | pmem->pfn_flags = PFN_DEV; |
200c79da | 513 | if (is_nd_pfn(dev)) { |
f6a55e1a | 514 | pmem->pgmap.type = MEMORY_DEVICE_FS_DAX; |
33a8f7f2 | 515 | pmem->pgmap.ops = &fsdax_pagemap_ops; |
e8d51348 | 516 | addr = devm_memremap_pages(dev, &pmem->pgmap); |
200c79da DW |
517 | pfn_sb = nd_pfn->pfn_sb; |
518 | pmem->data_offset = le64_to_cpu(pfn_sb->dataoff); | |
e8d51348 | 519 | pmem->pfn_pad = resource_size(res) - |
a4574f63 | 520 | range_len(&pmem->pgmap.range); |
200c79da | 521 | pmem->pfn_flags |= PFN_MAP; |
a4574f63 DW |
522 | bb_range = pmem->pgmap.range; |
523 | bb_range.start += pmem->data_offset; | |
200c79da | 524 | } else if (pmem_should_map_pages(dev)) { |
a4574f63 DW |
525 | pmem->pgmap.range.start = res->start; |
526 | pmem->pgmap.range.end = res->end; | |
b7b3c01b | 527 | pmem->pgmap.nr_range = 1; |
f6a55e1a | 528 | pmem->pgmap.type = MEMORY_DEVICE_FS_DAX; |
33a8f7f2 | 529 | pmem->pgmap.ops = &fsdax_pagemap_ops; |
e8d51348 | 530 | addr = devm_memremap_pages(dev, &pmem->pgmap); |
34c0fd54 | 531 | pmem->pfn_flags |= PFN_MAP; |
a4574f63 | 532 | bb_range = pmem->pgmap.range; |
91ed7ac4 | 533 | } else { |
32b2397c | 534 | addr = devm_memremap(dev, pmem->phys_addr, |
535 | pmem->size, ARCH_MEMREMAP_PMEM); | |
a4574f63 DW |
536 | bb_range.start = res->start; |
537 | bb_range.end = res->end; | |
91ed7ac4 | 538 | } |
b36f4761 | 539 | |
accf58af LC |
540 | if (IS_ERR(addr)) { |
541 | rc = PTR_ERR(addr); | |
542 | goto out; | |
543 | } | |
7a9eb206 | 544 | pmem->virt_addr = addr; |
9e853f23 | 545 | |
ce7f11a2 | 546 | blk_queue_write_cache(q, true, fua); |
8b904b5b | 547 | blk_queue_flag_set(QUEUE_FLAG_NONROT, q); |
3222d8c2 | 548 | blk_queue_flag_set(QUEUE_FLAG_SYNCHRONOUS, q); |
4557641b RZ |
549 | if (pmem->pfn_flags & PFN_MAP) |
550 | blk_queue_flag_set(QUEUE_FLAG_DAX, q); | |
9e853f23 | 551 | |
9e853f23 | 552 | disk->fops = &pmem_fops; |
6ec26b8b | 553 | disk->private_data = pmem; |
5212e11f | 554 | nvdimm_namespace_disk_name(ndns, disk->disk_name); |
cfe30b87 DW |
555 | set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset) |
556 | / 512); | |
b95f5f43 DW |
557 | if (devm_init_badblocks(dev, &pmem->bb)) |
558 | return -ENOMEM; | |
a4574f63 | 559 | nvdimm_badblocks_populate(nd_region, &pmem->bb, &bb_range); |
57f7f317 | 560 | disk->bb = &pmem->bb; |
f02716db | 561 | |
30c6828a | 562 | dax_dev = alloc_dax(pmem, &pmem_dax_ops); |
4e4ced93 | 563 | if (IS_ERR(dax_dev)) { |
accf58af LC |
564 | rc = PTR_ERR(dax_dev); |
565 | goto out; | |
c1d6e828 | 566 | } |
7ac5360c CH |
567 | set_dax_nocache(dax_dev); |
568 | set_dax_nomc(dax_dev); | |
30c6828a CH |
569 | if (is_nvdimm_sync(nd_region)) |
570 | set_dax_synchronous(dax_dev); | |
fb08a190 CH |
571 | rc = dax_add_host(dax_dev, disk); |
572 | if (rc) | |
573 | goto out_cleanup_dax; | |
ce7f11a2 | 574 | dax_write_cache(dax_dev, nvdimm_has_cache(nd_region)); |
c1d6e828 | 575 | pmem->dax_dev = dax_dev; |
6e0c90d6 | 576 | |
5a192ccc LC |
577 | rc = device_add_disk(dev, disk, pmem_attribute_groups); |
578 | if (rc) | |
fb08a190 | 579 | goto out_remove_host; |
c1d6e828 | 580 | if (devm_add_action_or_reset(dev, pmem_release_disk, pmem)) |
f02716db DW |
581 | return -ENOMEM; |
582 | ||
32f61d67 | 583 | nvdimm_check_and_set_ro(disk); |
9e853f23 | 584 | |
975750a9 TK |
585 | pmem->bb_state = sysfs_get_dirent(disk_to_dev(disk)->kobj.sd, |
586 | "badblocks"); | |
6aa734a2 DW |
587 | if (!pmem->bb_state) |
588 | dev_warn(dev, "'badblocks' notification disabled\n"); | |
8c2f7e86 | 589 | return 0; |
5a192ccc | 590 | |
fb08a190 CH |
591 | out_remove_host: |
592 | dax_remove_host(pmem->disk); | |
5a192ccc LC |
593 | out_cleanup_dax: |
594 | kill_dax(pmem->dax_dev); | |
595 | put_dax(pmem->dax_dev); | |
accf58af | 596 | out: |
8b9ab626 | 597 | put_disk(pmem->disk); |
accf58af | 598 | return rc; |
8c2f7e86 | 599 | } |
9e853f23 | 600 | |
9f53f9fa | 601 | static int nd_pmem_probe(struct device *dev) |
9e853f23 | 602 | { |
1c97afa7 | 603 | int ret; |
8c2f7e86 | 604 | struct nd_namespace_common *ndns; |
9e853f23 | 605 | |
8c2f7e86 DW |
606 | ndns = nvdimm_namespace_common_probe(dev); |
607 | if (IS_ERR(ndns)) | |
608 | return PTR_ERR(ndns); | |
bf9bccc1 | 609 | |
200c79da | 610 | if (is_nd_btt(dev)) |
708ab62b CH |
611 | return nvdimm_namespace_attach_btt(ndns); |
612 | ||
32ab0a3f | 613 | if (is_nd_pfn(dev)) |
200c79da | 614 | return pmem_attach_disk(dev, ndns); |
32ab0a3f | 615 | |
8f4b01fc AK |
616 | ret = devm_namespace_enable(dev, ndns, nd_info_block_reserve()); |
617 | if (ret) | |
618 | return ret; | |
619 | ||
1c97afa7 AK |
620 | ret = nd_btt_probe(dev, ndns); |
621 | if (ret == 0) | |
32ab0a3f | 622 | return -ENXIO; |
32ab0a3f | 623 | |
1c97afa7 AK |
624 | /* |
625 | * We have two failure conditions here, there is no | |
626 | * info reserver block or we found a valid info reserve block | |
627 | * but failed to initialize the pfn superblock. | |
628 | * | |
629 | * For the first case consider namespace as a raw pmem namespace | |
630 | * and attach a disk. | |
631 | * | |
632 | * For the latter, consider this a success and advance the namespace | |
633 | * seed. | |
634 | */ | |
635 | ret = nd_pfn_probe(dev, ndns); | |
636 | if (ret == 0) | |
637 | return -ENXIO; | |
638 | else if (ret == -EOPNOTSUPP) | |
639 | return ret; | |
640 | ||
641 | ret = nd_dax_probe(dev, ndns); | |
642 | if (ret == 0) | |
643 | return -ENXIO; | |
644 | else if (ret == -EOPNOTSUPP) | |
645 | return ret; | |
8f4b01fc AK |
646 | |
647 | /* probe complete, attach handles namespace enabling */ | |
648 | devm_namespace_disable(dev, ndns); | |
649 | ||
200c79da | 650 | return pmem_attach_disk(dev, ndns); |
9e853f23 RZ |
651 | } |
652 | ||
1f975074 | 653 | static void nd_pmem_remove(struct device *dev) |
9e853f23 | 654 | { |
6aa734a2 DW |
655 | struct pmem_device *pmem = dev_get_drvdata(dev); |
656 | ||
8c2f7e86 | 657 | if (is_nd_btt(dev)) |
298f2bc5 | 658 | nvdimm_namespace_detach_btt(to_nd_btt(dev)); |
6aa734a2 DW |
659 | else { |
660 | /* | |
81beea55 | 661 | * Note, this assumes device_lock() context to not |
87a30e1f | 662 | * race nd_pmem_notify() |
6aa734a2 DW |
663 | */ |
664 | sysfs_put(pmem->bb_state); | |
665 | pmem->bb_state = NULL; | |
666 | } | |
c5d4355d | 667 | nvdimm_flush(to_nd_region(dev->parent), NULL); |
9e853f23 RZ |
668 | } |
669 | ||
476f848a DW |
670 | static void nd_pmem_shutdown(struct device *dev) |
671 | { | |
c5d4355d | 672 | nvdimm_flush(to_nd_region(dev->parent), NULL); |
476f848a DW |
673 | } |
674 | ||
2361db89 | 675 | static void pmem_revalidate_poison(struct device *dev) |
71999466 | 676 | { |
b2518c78 | 677 | struct nd_region *nd_region; |
298f2bc5 DW |
678 | resource_size_t offset = 0, end_trunc = 0; |
679 | struct nd_namespace_common *ndns; | |
680 | struct nd_namespace_io *nsio; | |
b2518c78 | 681 | struct badblocks *bb; |
a4574f63 | 682 | struct range range; |
975750a9 | 683 | struct kernfs_node *bb_state; |
71999466 | 684 | |
298f2bc5 DW |
685 | if (is_nd_btt(dev)) { |
686 | struct nd_btt *nd_btt = to_nd_btt(dev); | |
687 | ||
688 | ndns = nd_btt->ndns; | |
b2518c78 TK |
689 | nd_region = to_nd_region(ndns->dev.parent); |
690 | nsio = to_nd_namespace_io(&ndns->dev); | |
691 | bb = &nsio->bb; | |
975750a9 | 692 | bb_state = NULL; |
b2518c78 TK |
693 | } else { |
694 | struct pmem_device *pmem = dev_get_drvdata(dev); | |
a3901802 | 695 | |
b2518c78 TK |
696 | nd_region = to_region(pmem); |
697 | bb = &pmem->bb; | |
975750a9 | 698 | bb_state = pmem->bb_state; |
b2518c78 TK |
699 | |
700 | if (is_nd_pfn(dev)) { | |
701 | struct nd_pfn *nd_pfn = to_nd_pfn(dev); | |
702 | struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb; | |
703 | ||
704 | ndns = nd_pfn->ndns; | |
705 | offset = pmem->data_offset + | |
706 | __le32_to_cpu(pfn_sb->start_pad); | |
707 | end_trunc = __le32_to_cpu(pfn_sb->end_trunc); | |
708 | } else { | |
709 | ndns = to_ndns(dev); | |
710 | } | |
711 | ||
712 | nsio = to_nd_namespace_io(&ndns->dev); | |
713 | } | |
a3901802 | 714 | |
a4574f63 DW |
715 | range.start = nsio->res.start + offset; |
716 | range.end = nsio->res.end - end_trunc; | |
717 | nvdimm_badblocks_populate(nd_region, bb, &range); | |
975750a9 TK |
718 | if (bb_state) |
719 | sysfs_notify_dirent(bb_state); | |
71999466 DW |
720 | } |
721 | ||
2361db89 DW |
722 | static void pmem_revalidate_region(struct device *dev) |
723 | { | |
724 | struct pmem_device *pmem; | |
725 | ||
726 | if (is_nd_btt(dev)) { | |
727 | struct nd_btt *nd_btt = to_nd_btt(dev); | |
728 | struct btt *btt = nd_btt->btt; | |
729 | ||
730 | nvdimm_check_and_set_ro(btt->btt_disk); | |
731 | return; | |
732 | } | |
733 | ||
734 | pmem = dev_get_drvdata(dev); | |
735 | nvdimm_check_and_set_ro(pmem->disk); | |
736 | } | |
737 | ||
738 | static void nd_pmem_notify(struct device *dev, enum nvdimm_event event) | |
739 | { | |
740 | switch (event) { | |
741 | case NVDIMM_REVALIDATE_POISON: | |
742 | pmem_revalidate_poison(dev); | |
743 | break; | |
744 | case NVDIMM_REVALIDATE_REGION: | |
745 | pmem_revalidate_region(dev); | |
746 | break; | |
747 | default: | |
748 | dev_WARN_ONCE(dev, 1, "notify: unknown event: %d\n", event); | |
749 | break; | |
750 | } | |
751 | } | |
752 | ||
9f53f9fa DW |
753 | MODULE_ALIAS("pmem"); |
754 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO); | |
bf9bccc1 | 755 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM); |
9f53f9fa DW |
756 | static struct nd_device_driver nd_pmem_driver = { |
757 | .probe = nd_pmem_probe, | |
758 | .remove = nd_pmem_remove, | |
71999466 | 759 | .notify = nd_pmem_notify, |
476f848a | 760 | .shutdown = nd_pmem_shutdown, |
9f53f9fa DW |
761 | .drv = { |
762 | .name = "nd_pmem", | |
9e853f23 | 763 | }, |
bf9bccc1 | 764 | .type = ND_DRIVER_NAMESPACE_IO | ND_DRIVER_NAMESPACE_PMEM, |
9e853f23 RZ |
765 | }; |
766 | ||
03e90843 | 767 | module_nd_driver(nd_pmem_driver); |
9e853f23 RZ |
768 | |
769 | MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>"); | |
770 | MODULE_LICENSE("GPL v2"); |