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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> |
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> |
e0cf615d CH |
27 | #include <linux/mm.h> |
28 | #include <asm/cacheflush.h> | |
f295e53b | 29 | #include "pmem.h" |
2361db89 | 30 | #include "btt.h" |
32ab0a3f | 31 | #include "pfn.h" |
9f53f9fa | 32 | #include "nd.h" |
9e853f23 | 33 | |
f284a4f2 DW |
34 | static struct device *to_dev(struct pmem_device *pmem) |
35 | { | |
36 | /* | |
37 | * nvdimm bus services need a 'dev' parameter, and we record the device | |
38 | * at init in bb.dev. | |
39 | */ | |
40 | return pmem->bb.dev; | |
41 | } | |
42 | ||
43 | static struct nd_region *to_region(struct pmem_device *pmem) | |
44 | { | |
45 | return to_nd_region(to_dev(pmem)->parent); | |
46 | } | |
9e853f23 | 47 | |
9409c9b6 | 48 | static phys_addr_t to_phys(struct pmem_device *pmem, phys_addr_t offset) |
c953cc98 | 49 | { |
9409c9b6 JC |
50 | return pmem->phys_addr + offset; |
51 | } | |
52 | ||
53 | static sector_t to_sect(struct pmem_device *pmem, phys_addr_t offset) | |
54 | { | |
55 | return (offset - pmem->data_offset) >> SECTOR_SHIFT; | |
56 | } | |
57 | ||
58 | static phys_addr_t to_offset(struct pmem_device *pmem, sector_t sector) | |
59 | { | |
60 | return (sector << SECTOR_SHIFT) + pmem->data_offset; | |
61 | } | |
62 | ||
63 | static void pmem_mkpage_present(struct pmem_device *pmem, phys_addr_t offset, | |
64 | unsigned int len) | |
65 | { | |
66 | phys_addr_t phys = to_phys(pmem, offset); | |
c953cc98 DW |
67 | unsigned long pfn_start, pfn_end, pfn; |
68 | ||
69 | /* only pmem in the linear map supports HWPoison */ | |
70 | if (is_vmalloc_addr(pmem->virt_addr)) | |
71 | return; | |
72 | ||
73 | pfn_start = PHYS_PFN(phys); | |
74 | pfn_end = pfn_start + PHYS_PFN(len); | |
75 | for (pfn = pfn_start; pfn < pfn_end; pfn++) { | |
76 | struct page *page = pfn_to_page(pfn); | |
77 | ||
78 | /* | |
79 | * Note, no need to hold a get_dev_pagemap() reference | |
80 | * here since we're in the driver I/O path and | |
81 | * outstanding I/O requests pin the dev_pagemap. | |
82 | */ | |
83 | if (test_and_clear_pmem_poison(page)) | |
84 | clear_mce_nospec(pfn); | |
85 | } | |
86 | } | |
87 | ||
9409c9b6 | 88 | static void pmem_clear_bb(struct pmem_device *pmem, sector_t sector, long blks) |
59e64739 | 89 | { |
9409c9b6 JC |
90 | if (blks == 0) |
91 | return; | |
92 | badblocks_clear(&pmem->bb, sector, blks); | |
93 | if (pmem->bb_state) | |
94 | sysfs_notify_dirent(pmem->bb_state); | |
95 | } | |
59e64739 | 96 | |
9409c9b6 JC |
97 | static long __pmem_clear_poison(struct pmem_device *pmem, |
98 | phys_addr_t offset, unsigned int len) | |
99 | { | |
100 | phys_addr_t phys = to_phys(pmem, offset); | |
101 | long cleared = nvdimm_clear_poison(to_dev(pmem), phys, len); | |
59e64739 | 102 | |
9409c9b6 JC |
103 | if (cleared > 0) { |
104 | pmem_mkpage_present(pmem, offset, cleared); | |
105 | arch_invalidate_pmem(pmem->virt_addr + offset, len); | |
59e64739 | 106 | } |
9409c9b6 JC |
107 | return cleared; |
108 | } | |
3115bb02 | 109 | |
9409c9b6 JC |
110 | static blk_status_t pmem_clear_poison(struct pmem_device *pmem, |
111 | phys_addr_t offset, unsigned int len) | |
112 | { | |
113 | long cleared = __pmem_clear_poison(pmem, offset, len); | |
868f036f | 114 | |
9409c9b6 JC |
115 | if (cleared < 0) |
116 | return BLK_STS_IOERR; | |
117 | ||
118 | pmem_clear_bb(pmem, to_sect(pmem, offset), cleared >> SECTOR_SHIFT); | |
119 | if (cleared < len) | |
120 | return BLK_STS_IOERR; | |
121 | return BLK_STS_OK; | |
59e64739 DW |
122 | } |
123 | ||
bd697a80 VV |
124 | static void write_pmem(void *pmem_addr, struct page *page, |
125 | unsigned int off, unsigned int len) | |
126 | { | |
98cc093c HY |
127 | unsigned int chunk; |
128 | void *mem; | |
129 | ||
130 | while (len) { | |
131 | mem = kmap_atomic(page); | |
9dc6488e | 132 | chunk = min_t(unsigned int, len, PAGE_SIZE - off); |
98cc093c HY |
133 | memcpy_flushcache(pmem_addr, mem + off, chunk); |
134 | kunmap_atomic(mem); | |
135 | len -= chunk; | |
136 | off = 0; | |
137 | page++; | |
9dc6488e | 138 | pmem_addr += chunk; |
98cc093c | 139 | } |
bd697a80 VV |
140 | } |
141 | ||
4e4cbee9 | 142 | static blk_status_t read_pmem(struct page *page, unsigned int off, |
bd697a80 VV |
143 | void *pmem_addr, unsigned int len) |
144 | { | |
98cc093c | 145 | unsigned int chunk; |
60622d68 | 146 | unsigned long rem; |
98cc093c HY |
147 | void *mem; |
148 | ||
149 | while (len) { | |
150 | mem = kmap_atomic(page); | |
9dc6488e | 151 | chunk = min_t(unsigned int, len, PAGE_SIZE - off); |
ec6347bb | 152 | rem = copy_mc_to_kernel(mem + off, pmem_addr, chunk); |
98cc093c | 153 | kunmap_atomic(mem); |
60622d68 | 154 | if (rem) |
98cc093c HY |
155 | return BLK_STS_IOERR; |
156 | len -= chunk; | |
157 | off = 0; | |
158 | page++; | |
9dc6488e | 159 | pmem_addr += chunk; |
98cc093c | 160 | } |
4e4cbee9 | 161 | return BLK_STS_OK; |
bd697a80 VV |
162 | } |
163 | ||
5d64efe7 VG |
164 | static blk_status_t pmem_do_read(struct pmem_device *pmem, |
165 | struct page *page, unsigned int page_off, | |
166 | sector_t sector, unsigned int len) | |
167 | { | |
168 | blk_status_t rc; | |
9409c9b6 | 169 | phys_addr_t pmem_off = to_offset(pmem, sector); |
5d64efe7 VG |
170 | void *pmem_addr = pmem->virt_addr + pmem_off; |
171 | ||
172 | if (unlikely(is_bad_pmem(&pmem->bb, sector, len))) | |
173 | return BLK_STS_IOERR; | |
174 | ||
175 | rc = read_pmem(page, page_off, pmem_addr, len); | |
176 | flush_dcache_page(page); | |
177 | return rc; | |
178 | } | |
179 | ||
180 | static blk_status_t pmem_do_write(struct pmem_device *pmem, | |
181 | struct page *page, unsigned int page_off, | |
182 | sector_t sector, unsigned int len) | |
9e853f23 | 183 | { |
9409c9b6 | 184 | phys_addr_t pmem_off = to_offset(pmem, sector); |
7a9eb206 | 185 | void *pmem_addr = pmem->virt_addr + pmem_off; |
9e853f23 | 186 | |
5898b43a JC |
187 | if (unlikely(is_bad_pmem(&pmem->bb, sector, len))) { |
188 | blk_status_t rc = pmem_clear_poison(pmem, pmem_off, len); | |
189 | ||
190 | if (rc != BLK_STS_OK) | |
191 | return rc; | |
192 | } | |
59e64739 | 193 | |
5d64efe7 VG |
194 | flush_dcache_page(page); |
195 | write_pmem(pmem_addr, page, page_off, len); | |
9e853f23 | 196 | |
5898b43a | 197 | return BLK_STS_OK; |
9e853f23 RZ |
198 | } |
199 | ||
3e08773c | 200 | static void pmem_submit_bio(struct bio *bio) |
9e853f23 | 201 | { |
c5d4355d | 202 | int ret = 0; |
4e4cbee9 | 203 | blk_status_t rc = 0; |
f0dc089c DW |
204 | bool do_acct; |
205 | unsigned long start; | |
9e853f23 | 206 | struct bio_vec bvec; |
9e853f23 | 207 | struct bvec_iter iter; |
309dca30 | 208 | struct pmem_device *pmem = bio->bi_bdev->bd_disk->private_data; |
7e267a8c DW |
209 | struct nd_region *nd_region = to_region(pmem); |
210 | ||
d2d6364d | 211 | if (bio->bi_opf & REQ_PREFLUSH) |
c5d4355d | 212 | ret = nvdimm_flush(nd_region, bio); |
9e853f23 | 213 | |
309dca30 | 214 | do_acct = blk_queue_io_stat(bio->bi_bdev->bd_disk->queue); |
0fd92f89 CH |
215 | if (do_acct) |
216 | start = bio_start_io_acct(bio); | |
e10624f8 | 217 | bio_for_each_segment(bvec, bio, iter) { |
5d64efe7 VG |
218 | if (op_is_write(bio_op(bio))) |
219 | rc = pmem_do_write(pmem, bvec.bv_page, bvec.bv_offset, | |
220 | iter.bi_sector, bvec.bv_len); | |
221 | else | |
222 | rc = pmem_do_read(pmem, bvec.bv_page, bvec.bv_offset, | |
223 | iter.bi_sector, bvec.bv_len); | |
e10624f8 | 224 | if (rc) { |
4e4cbee9 | 225 | bio->bi_status = rc; |
e10624f8 DW |
226 | break; |
227 | } | |
228 | } | |
f0dc089c | 229 | if (do_acct) |
0fd92f89 | 230 | bio_end_io_acct(bio, start); |
61031952 | 231 | |
1eff9d32 | 232 | if (bio->bi_opf & REQ_FUA) |
c5d4355d PG |
233 | ret = nvdimm_flush(nd_region, bio); |
234 | ||
235 | if (ret) | |
236 | bio->bi_status = errno_to_blk_status(ret); | |
61031952 | 237 | |
4246a0b6 | 238 | bio_endio(bio); |
9e853f23 RZ |
239 | } |
240 | ||
241 | static int pmem_rw_page(struct block_device *bdev, sector_t sector, | |
3f289dcb | 242 | struct page *page, unsigned int op) |
9e853f23 | 243 | { |
6ec26b8b | 244 | struct pmem_device *pmem = bdev->bd_disk->private_data; |
4e4cbee9 | 245 | blk_status_t rc; |
9e853f23 | 246 | |
5d64efe7 | 247 | if (op_is_write(op)) |
af3bbc12 | 248 | rc = pmem_do_write(pmem, page, 0, sector, thp_size(page)); |
5d64efe7 | 249 | else |
af3bbc12 | 250 | rc = pmem_do_read(pmem, page, 0, sector, thp_size(page)); |
e10624f8 DW |
251 | /* |
252 | * The ->rw_page interface is subtle and tricky. The core | |
253 | * retries on any error, so we can only invoke page_endio() in | |
254 | * the successful completion case. Otherwise, we'll see crashes | |
255 | * caused by double completion. | |
256 | */ | |
257 | if (rc == 0) | |
3f289dcb | 258 | page_endio(page, op_is_write(op), 0); |
e10624f8 | 259 | |
4e4cbee9 | 260 | return blk_status_to_errno(rc); |
9e853f23 RZ |
261 | } |
262 | ||
f295e53b | 263 | /* see "strong" declaration in tools/testing/nvdimm/pmem-dax.c */ |
c1d6e828 | 264 | __weak long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff, |
e511c4a3 JC |
265 | long nr_pages, enum dax_access_mode mode, void **kaddr, |
266 | pfn_t *pfn) | |
9e853f23 | 267 | { |
c1d6e828 | 268 | resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset; |
f42e8e50 JC |
269 | sector_t sector = PFN_PHYS(pgoff) >> SECTOR_SHIFT; |
270 | unsigned int num = PFN_PHYS(nr_pages) >> SECTOR_SHIFT; | |
271 | struct badblocks *bb = &pmem->bb; | |
272 | sector_t first_bad; | |
273 | int num_bad; | |
46a590cd HY |
274 | |
275 | if (kaddr) | |
276 | *kaddr = pmem->virt_addr + offset; | |
277 | if (pfn) | |
278 | *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags); | |
9e853f23 | 279 | |
f42e8e50 JC |
280 | if (bb->count && |
281 | badblocks_check(bb, sector, num, &first_bad, &num_bad)) { | |
282 | long actual_nr; | |
283 | ||
284 | if (mode != DAX_RECOVERY_WRITE) | |
285 | return -EIO; | |
286 | ||
287 | /* | |
288 | * Set the recovery stride is set to kernel page size because | |
289 | * the underlying driver and firmware clear poison functions | |
290 | * don't appear to handle large chunk(such as 2MiB) reliably. | |
291 | */ | |
292 | actual_nr = PHYS_PFN( | |
293 | PAGE_ALIGN((first_bad - sector) << SECTOR_SHIFT)); | |
294 | dev_dbg(pmem->bb.dev, "start sector(%llu), nr_pages(%ld), first_bad(%llu), actual_nr(%ld)\n", | |
295 | sector, nr_pages, first_bad, actual_nr); | |
296 | if (actual_nr) | |
297 | return actual_nr; | |
298 | return 1; | |
299 | } | |
300 | ||
0a70bd43 | 301 | /* |
f42e8e50 JC |
302 | * If badblocks are present but not in the range, limit known good range |
303 | * to the requested range. | |
0a70bd43 | 304 | */ |
f42e8e50 | 305 | if (bb->count) |
c1d6e828 DW |
306 | return nr_pages; |
307 | return PHYS_PFN(pmem->size - pmem->pfn_pad - offset); | |
9e853f23 RZ |
308 | } |
309 | ||
310 | static const struct block_device_operations pmem_fops = { | |
311 | .owner = THIS_MODULE, | |
c62b37d9 | 312 | .submit_bio = pmem_submit_bio, |
9e853f23 | 313 | .rw_page = pmem_rw_page, |
9e853f23 RZ |
314 | }; |
315 | ||
f605a263 VG |
316 | static int pmem_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff, |
317 | size_t nr_pages) | |
318 | { | |
319 | struct pmem_device *pmem = dax_get_private(dax_dev); | |
320 | ||
321 | return blk_status_to_errno(pmem_do_write(pmem, ZERO_PAGE(0), 0, | |
322 | PFN_PHYS(pgoff) >> SECTOR_SHIFT, | |
323 | PAGE_SIZE)); | |
324 | } | |
325 | ||
c1d6e828 | 326 | static long pmem_dax_direct_access(struct dax_device *dax_dev, |
e511c4a3 JC |
327 | pgoff_t pgoff, long nr_pages, enum dax_access_mode mode, |
328 | void **kaddr, pfn_t *pfn) | |
c1d6e828 DW |
329 | { |
330 | struct pmem_device *pmem = dax_get_private(dax_dev); | |
331 | ||
e511c4a3 | 332 | return __pmem_direct_access(pmem, pgoff, nr_pages, mode, kaddr, pfn); |
c1d6e828 DW |
333 | } |
334 | ||
f42e8e50 JC |
335 | /* |
336 | * The recovery write thread started out as a normal pwrite thread and | |
337 | * when the filesystem was told about potential media error in the | |
338 | * range, filesystem turns the normal pwrite to a dax_recovery_write. | |
339 | * | |
340 | * The recovery write consists of clearing media poison, clearing page | |
341 | * HWPoison bit, reenable page-wide read-write permission, flush the | |
342 | * caches and finally write. A competing pread thread will be held | |
343 | * off during the recovery process since data read back might not be | |
344 | * valid, and this is achieved by clearing the badblock records after | |
345 | * the recovery write is complete. Competing recovery write threads | |
346 | * are already serialized by writer lock held by dax_iomap_rw(). | |
347 | */ | |
047218ec JC |
348 | static size_t pmem_recovery_write(struct dax_device *dax_dev, pgoff_t pgoff, |
349 | void *addr, size_t bytes, struct iov_iter *i) | |
350 | { | |
f42e8e50 JC |
351 | struct pmem_device *pmem = dax_get_private(dax_dev); |
352 | size_t olen, len, off; | |
353 | phys_addr_t pmem_off; | |
354 | struct device *dev = pmem->bb.dev; | |
355 | long cleared; | |
356 | ||
357 | off = offset_in_page(addr); | |
358 | len = PFN_PHYS(PFN_UP(off + bytes)); | |
359 | if (!is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) >> SECTOR_SHIFT, len)) | |
360 | return _copy_from_iter_flushcache(addr, bytes, i); | |
361 | ||
362 | /* | |
363 | * Not page-aligned range cannot be recovered. This should not | |
364 | * happen unless something else went wrong. | |
365 | */ | |
366 | if (off || !PAGE_ALIGNED(bytes)) { | |
367 | dev_dbg(dev, "Found poison, but addr(%p) or bytes(%#zx) not page aligned\n", | |
368 | addr, bytes); | |
369 | return 0; | |
370 | } | |
371 | ||
372 | pmem_off = PFN_PHYS(pgoff) + pmem->data_offset; | |
373 | cleared = __pmem_clear_poison(pmem, pmem_off, len); | |
374 | if (cleared > 0 && cleared < len) { | |
375 | dev_dbg(dev, "poison cleared only %ld out of %zu bytes\n", | |
376 | cleared, len); | |
377 | return 0; | |
378 | } | |
379 | if (cleared < 0) { | |
380 | dev_dbg(dev, "poison clear failed: %ld\n", cleared); | |
381 | return 0; | |
382 | } | |
383 | ||
384 | olen = _copy_from_iter_flushcache(addr, bytes, i); | |
385 | pmem_clear_bb(pmem, to_sect(pmem, pmem_off), cleared >> SECTOR_SHIFT); | |
386 | ||
387 | return olen; | |
047218ec JC |
388 | } |
389 | ||
c1d6e828 DW |
390 | static const struct dax_operations pmem_dax_ops = { |
391 | .direct_access = pmem_dax_direct_access, | |
f605a263 | 392 | .zero_page_range = pmem_dax_zero_page_range, |
047218ec | 393 | .recovery_write = pmem_recovery_write, |
c1d6e828 DW |
394 | }; |
395 | ||
e765f13e CH |
396 | static ssize_t write_cache_show(struct device *dev, |
397 | struct device_attribute *attr, char *buf) | |
398 | { | |
399 | struct pmem_device *pmem = dev_to_disk(dev)->private_data; | |
400 | ||
401 | return sprintf(buf, "%d\n", !!dax_write_cache_enabled(pmem->dax_dev)); | |
402 | } | |
403 | ||
404 | static ssize_t write_cache_store(struct device *dev, | |
405 | struct device_attribute *attr, const char *buf, size_t len) | |
406 | { | |
407 | struct pmem_device *pmem = dev_to_disk(dev)->private_data; | |
408 | bool write_cache; | |
409 | int rc; | |
410 | ||
411 | rc = strtobool(buf, &write_cache); | |
412 | if (rc) | |
413 | return rc; | |
414 | dax_write_cache(pmem->dax_dev, write_cache); | |
415 | return len; | |
416 | } | |
417 | static DEVICE_ATTR_RW(write_cache); | |
418 | ||
419 | static umode_t dax_visible(struct kobject *kobj, struct attribute *a, int n) | |
420 | { | |
421 | #ifndef CONFIG_ARCH_HAS_PMEM_API | |
422 | if (a == &dev_attr_write_cache.attr) | |
423 | return 0; | |
424 | #endif | |
425 | return a->mode; | |
426 | } | |
427 | ||
428 | static struct attribute *dax_attributes[] = { | |
429 | &dev_attr_write_cache.attr, | |
430 | NULL, | |
431 | }; | |
432 | ||
433 | static const struct attribute_group dax_attribute_group = { | |
434 | .name = "dax", | |
435 | .attrs = dax_attributes, | |
436 | .is_visible = dax_visible, | |
437 | }; | |
438 | ||
6e0c90d6 DW |
439 | static const struct attribute_group *pmem_attribute_groups[] = { |
440 | &dax_attribute_group, | |
441 | NULL, | |
c1d6e828 DW |
442 | }; |
443 | ||
c1d6e828 | 444 | static void pmem_release_disk(void *__pmem) |
030b99e3 | 445 | { |
c1d6e828 DW |
446 | struct pmem_device *pmem = __pmem; |
447 | ||
fb08a190 | 448 | dax_remove_host(pmem->disk); |
c1d6e828 DW |
449 | kill_dax(pmem->dax_dev); |
450 | put_dax(pmem->dax_dev); | |
451 | del_gendisk(pmem->disk); | |
030b99e3 | 452 | |
3dd60fb9 CH |
453 | blk_cleanup_disk(pmem->disk); |
454 | } | |
1e240e8d | 455 | |
200c79da DW |
456 | static int pmem_attach_disk(struct device *dev, |
457 | struct nd_namespace_common *ndns) | |
9e853f23 | 458 | { |
200c79da | 459 | struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); |
f284a4f2 | 460 | struct nd_region *nd_region = to_nd_region(dev->parent); |
ce7f11a2 | 461 | int nid = dev_to_node(dev), fua; |
200c79da | 462 | struct resource *res = &nsio->res; |
a4574f63 | 463 | struct range bb_range; |
200c79da | 464 | struct nd_pfn *nd_pfn = NULL; |
c1d6e828 | 465 | struct dax_device *dax_dev; |
200c79da | 466 | struct nd_pfn_sb *pfn_sb; |
9e853f23 | 467 | struct pmem_device *pmem; |
468ded03 | 468 | struct request_queue *q; |
200c79da DW |
469 | struct gendisk *disk; |
470 | void *addr; | |
e8d51348 CH |
471 | int rc; |
472 | ||
473 | pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL); | |
474 | if (!pmem) | |
475 | return -ENOMEM; | |
200c79da | 476 | |
8f4b01fc AK |
477 | rc = devm_namespace_enable(dev, ndns, nd_info_block_reserve()); |
478 | if (rc) | |
479 | return rc; | |
480 | ||
200c79da DW |
481 | /* while nsio_rw_bytes is active, parse a pfn info block if present */ |
482 | if (is_nd_pfn(dev)) { | |
483 | nd_pfn = to_nd_pfn(dev); | |
e8d51348 CH |
484 | rc = nvdimm_setup_pfn(nd_pfn, &pmem->pgmap); |
485 | if (rc) | |
486 | return rc; | |
200c79da DW |
487 | } |
488 | ||
489 | /* we're attaching a block device, disable raw namespace access */ | |
8f4b01fc | 490 | devm_namespace_disable(dev, ndns); |
9e853f23 | 491 | |
200c79da | 492 | dev_set_drvdata(dev, pmem); |
9e853f23 RZ |
493 | pmem->phys_addr = res->start; |
494 | pmem->size = resource_size(res); | |
0b277961 DW |
495 | fua = nvdimm_has_flush(nd_region); |
496 | if (!IS_ENABLED(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) || fua < 0) { | |
61031952 | 497 | dev_warn(dev, "unable to guarantee persistence of writes\n"); |
0b277961 DW |
498 | fua = 0; |
499 | } | |
9e853f23 | 500 | |
947df02d | 501 | if (!devm_request_mem_region(dev, res->start, resource_size(res), |
450c6633 | 502 | dev_name(&ndns->dev))) { |
947df02d | 503 | dev_warn(dev, "could not reserve region %pR\n", res); |
200c79da | 504 | return -EBUSY; |
9e853f23 RZ |
505 | } |
506 | ||
87eb73b2 CH |
507 | disk = blk_alloc_disk(nid); |
508 | if (!disk) | |
200c79da | 509 | return -ENOMEM; |
87eb73b2 | 510 | q = disk->queue; |
468ded03 | 511 | |
87eb73b2 | 512 | pmem->disk = disk; |
a624eb52 | 513 | pmem->pgmap.owner = pmem; |
34c0fd54 | 514 | pmem->pfn_flags = PFN_DEV; |
200c79da | 515 | if (is_nd_pfn(dev)) { |
f6a55e1a | 516 | pmem->pgmap.type = MEMORY_DEVICE_FS_DAX; |
e8d51348 | 517 | addr = devm_memremap_pages(dev, &pmem->pgmap); |
200c79da DW |
518 | pfn_sb = nd_pfn->pfn_sb; |
519 | pmem->data_offset = le64_to_cpu(pfn_sb->dataoff); | |
e8d51348 | 520 | pmem->pfn_pad = resource_size(res) - |
a4574f63 | 521 | range_len(&pmem->pgmap.range); |
200c79da | 522 | pmem->pfn_flags |= PFN_MAP; |
a4574f63 DW |
523 | bb_range = pmem->pgmap.range; |
524 | bb_range.start += pmem->data_offset; | |
200c79da | 525 | } else if (pmem_should_map_pages(dev)) { |
a4574f63 DW |
526 | pmem->pgmap.range.start = res->start; |
527 | pmem->pgmap.range.end = res->end; | |
b7b3c01b | 528 | pmem->pgmap.nr_range = 1; |
f6a55e1a | 529 | pmem->pgmap.type = MEMORY_DEVICE_FS_DAX; |
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); |
5a92289f | 547 | blk_queue_physical_block_size(q, PAGE_SIZE); |
f979b13c | 548 | blk_queue_logical_block_size(q, pmem_sector_size(ndns)); |
5a92289f | 549 | blk_queue_max_hw_sectors(q, UINT_MAX); |
8b904b5b | 550 | blk_queue_flag_set(QUEUE_FLAG_NONROT, q); |
4557641b RZ |
551 | if (pmem->pfn_flags & PFN_MAP) |
552 | blk_queue_flag_set(QUEUE_FLAG_DAX, q); | |
9e853f23 | 553 | |
9e853f23 | 554 | disk->fops = &pmem_fops; |
6ec26b8b | 555 | disk->private_data = pmem; |
5212e11f | 556 | nvdimm_namespace_disk_name(ndns, disk->disk_name); |
cfe30b87 DW |
557 | set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset) |
558 | / 512); | |
b95f5f43 DW |
559 | if (devm_init_badblocks(dev, &pmem->bb)) |
560 | return -ENOMEM; | |
a4574f63 | 561 | nvdimm_badblocks_populate(nd_region, &pmem->bb, &bb_range); |
57f7f317 | 562 | disk->bb = &pmem->bb; |
f02716db | 563 | |
30c6828a | 564 | dax_dev = alloc_dax(pmem, &pmem_dax_ops); |
4e4ced93 | 565 | if (IS_ERR(dax_dev)) { |
accf58af LC |
566 | rc = PTR_ERR(dax_dev); |
567 | goto out; | |
c1d6e828 | 568 | } |
7ac5360c CH |
569 | set_dax_nocache(dax_dev); |
570 | set_dax_nomc(dax_dev); | |
30c6828a CH |
571 | if (is_nvdimm_sync(nd_region)) |
572 | set_dax_synchronous(dax_dev); | |
fb08a190 CH |
573 | rc = dax_add_host(dax_dev, disk); |
574 | if (rc) | |
575 | goto out_cleanup_dax; | |
ce7f11a2 | 576 | dax_write_cache(dax_dev, nvdimm_has_cache(nd_region)); |
c1d6e828 | 577 | pmem->dax_dev = dax_dev; |
6e0c90d6 | 578 | |
5a192ccc LC |
579 | rc = device_add_disk(dev, disk, pmem_attribute_groups); |
580 | if (rc) | |
fb08a190 | 581 | goto out_remove_host; |
c1d6e828 | 582 | if (devm_add_action_or_reset(dev, pmem_release_disk, pmem)) |
f02716db DW |
583 | return -ENOMEM; |
584 | ||
32f61d67 | 585 | nvdimm_check_and_set_ro(disk); |
9e853f23 | 586 | |
975750a9 TK |
587 | pmem->bb_state = sysfs_get_dirent(disk_to_dev(disk)->kobj.sd, |
588 | "badblocks"); | |
6aa734a2 DW |
589 | if (!pmem->bb_state) |
590 | dev_warn(dev, "'badblocks' notification disabled\n"); | |
8c2f7e86 | 591 | return 0; |
5a192ccc | 592 | |
fb08a190 CH |
593 | out_remove_host: |
594 | dax_remove_host(pmem->disk); | |
5a192ccc LC |
595 | out_cleanup_dax: |
596 | kill_dax(pmem->dax_dev); | |
597 | put_dax(pmem->dax_dev); | |
accf58af LC |
598 | out: |
599 | blk_cleanup_disk(pmem->disk); | |
600 | return rc; | |
8c2f7e86 | 601 | } |
9e853f23 | 602 | |
9f53f9fa | 603 | static int nd_pmem_probe(struct device *dev) |
9e853f23 | 604 | { |
1c97afa7 | 605 | int ret; |
8c2f7e86 | 606 | struct nd_namespace_common *ndns; |
9e853f23 | 607 | |
8c2f7e86 DW |
608 | ndns = nvdimm_namespace_common_probe(dev); |
609 | if (IS_ERR(ndns)) | |
610 | return PTR_ERR(ndns); | |
bf9bccc1 | 611 | |
200c79da | 612 | if (is_nd_btt(dev)) |
708ab62b CH |
613 | return nvdimm_namespace_attach_btt(ndns); |
614 | ||
32ab0a3f | 615 | if (is_nd_pfn(dev)) |
200c79da | 616 | return pmem_attach_disk(dev, ndns); |
32ab0a3f | 617 | |
8f4b01fc AK |
618 | ret = devm_namespace_enable(dev, ndns, nd_info_block_reserve()); |
619 | if (ret) | |
620 | return ret; | |
621 | ||
1c97afa7 AK |
622 | ret = nd_btt_probe(dev, ndns); |
623 | if (ret == 0) | |
32ab0a3f | 624 | return -ENXIO; |
32ab0a3f | 625 | |
1c97afa7 AK |
626 | /* |
627 | * We have two failure conditions here, there is no | |
628 | * info reserver block or we found a valid info reserve block | |
629 | * but failed to initialize the pfn superblock. | |
630 | * | |
631 | * For the first case consider namespace as a raw pmem namespace | |
632 | * and attach a disk. | |
633 | * | |
634 | * For the latter, consider this a success and advance the namespace | |
635 | * seed. | |
636 | */ | |
637 | ret = nd_pfn_probe(dev, ndns); | |
638 | if (ret == 0) | |
639 | return -ENXIO; | |
640 | else if (ret == -EOPNOTSUPP) | |
641 | return ret; | |
642 | ||
643 | ret = nd_dax_probe(dev, ndns); | |
644 | if (ret == 0) | |
645 | return -ENXIO; | |
646 | else if (ret == -EOPNOTSUPP) | |
647 | return ret; | |
8f4b01fc AK |
648 | |
649 | /* probe complete, attach handles namespace enabling */ | |
650 | devm_namespace_disable(dev, ndns); | |
651 | ||
200c79da | 652 | return pmem_attach_disk(dev, ndns); |
9e853f23 RZ |
653 | } |
654 | ||
1f975074 | 655 | static void nd_pmem_remove(struct device *dev) |
9e853f23 | 656 | { |
6aa734a2 DW |
657 | struct pmem_device *pmem = dev_get_drvdata(dev); |
658 | ||
8c2f7e86 | 659 | if (is_nd_btt(dev)) |
298f2bc5 | 660 | nvdimm_namespace_detach_btt(to_nd_btt(dev)); |
6aa734a2 DW |
661 | else { |
662 | /* | |
81beea55 | 663 | * Note, this assumes device_lock() context to not |
87a30e1f | 664 | * race nd_pmem_notify() |
6aa734a2 DW |
665 | */ |
666 | sysfs_put(pmem->bb_state); | |
667 | pmem->bb_state = NULL; | |
668 | } | |
c5d4355d | 669 | nvdimm_flush(to_nd_region(dev->parent), NULL); |
9e853f23 RZ |
670 | } |
671 | ||
476f848a DW |
672 | static void nd_pmem_shutdown(struct device *dev) |
673 | { | |
c5d4355d | 674 | nvdimm_flush(to_nd_region(dev->parent), NULL); |
476f848a DW |
675 | } |
676 | ||
2361db89 | 677 | static void pmem_revalidate_poison(struct device *dev) |
71999466 | 678 | { |
b2518c78 | 679 | struct nd_region *nd_region; |
298f2bc5 DW |
680 | resource_size_t offset = 0, end_trunc = 0; |
681 | struct nd_namespace_common *ndns; | |
682 | struct nd_namespace_io *nsio; | |
b2518c78 | 683 | struct badblocks *bb; |
a4574f63 | 684 | struct range range; |
975750a9 | 685 | struct kernfs_node *bb_state; |
71999466 | 686 | |
298f2bc5 DW |
687 | if (is_nd_btt(dev)) { |
688 | struct nd_btt *nd_btt = to_nd_btt(dev); | |
689 | ||
690 | ndns = nd_btt->ndns; | |
b2518c78 TK |
691 | nd_region = to_nd_region(ndns->dev.parent); |
692 | nsio = to_nd_namespace_io(&ndns->dev); | |
693 | bb = &nsio->bb; | |
975750a9 | 694 | bb_state = NULL; |
b2518c78 TK |
695 | } else { |
696 | struct pmem_device *pmem = dev_get_drvdata(dev); | |
a3901802 | 697 | |
b2518c78 TK |
698 | nd_region = to_region(pmem); |
699 | bb = &pmem->bb; | |
975750a9 | 700 | bb_state = pmem->bb_state; |
b2518c78 TK |
701 | |
702 | if (is_nd_pfn(dev)) { | |
703 | struct nd_pfn *nd_pfn = to_nd_pfn(dev); | |
704 | struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb; | |
705 | ||
706 | ndns = nd_pfn->ndns; | |
707 | offset = pmem->data_offset + | |
708 | __le32_to_cpu(pfn_sb->start_pad); | |
709 | end_trunc = __le32_to_cpu(pfn_sb->end_trunc); | |
710 | } else { | |
711 | ndns = to_ndns(dev); | |
712 | } | |
713 | ||
714 | nsio = to_nd_namespace_io(&ndns->dev); | |
715 | } | |
a3901802 | 716 | |
a4574f63 DW |
717 | range.start = nsio->res.start + offset; |
718 | range.end = nsio->res.end - end_trunc; | |
719 | nvdimm_badblocks_populate(nd_region, bb, &range); | |
975750a9 TK |
720 | if (bb_state) |
721 | sysfs_notify_dirent(bb_state); | |
71999466 DW |
722 | } |
723 | ||
2361db89 DW |
724 | static void pmem_revalidate_region(struct device *dev) |
725 | { | |
726 | struct pmem_device *pmem; | |
727 | ||
728 | if (is_nd_btt(dev)) { | |
729 | struct nd_btt *nd_btt = to_nd_btt(dev); | |
730 | struct btt *btt = nd_btt->btt; | |
731 | ||
732 | nvdimm_check_and_set_ro(btt->btt_disk); | |
733 | return; | |
734 | } | |
735 | ||
736 | pmem = dev_get_drvdata(dev); | |
737 | nvdimm_check_and_set_ro(pmem->disk); | |
738 | } | |
739 | ||
740 | static void nd_pmem_notify(struct device *dev, enum nvdimm_event event) | |
741 | { | |
742 | switch (event) { | |
743 | case NVDIMM_REVALIDATE_POISON: | |
744 | pmem_revalidate_poison(dev); | |
745 | break; | |
746 | case NVDIMM_REVALIDATE_REGION: | |
747 | pmem_revalidate_region(dev); | |
748 | break; | |
749 | default: | |
750 | dev_WARN_ONCE(dev, 1, "notify: unknown event: %d\n", event); | |
751 | break; | |
752 | } | |
753 | } | |
754 | ||
9f53f9fa DW |
755 | MODULE_ALIAS("pmem"); |
756 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO); | |
bf9bccc1 | 757 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM); |
9f53f9fa DW |
758 | static struct nd_device_driver nd_pmem_driver = { |
759 | .probe = nd_pmem_probe, | |
760 | .remove = nd_pmem_remove, | |
71999466 | 761 | .notify = nd_pmem_notify, |
476f848a | 762 | .shutdown = nd_pmem_shutdown, |
9f53f9fa DW |
763 | .drv = { |
764 | .name = "nd_pmem", | |
9e853f23 | 765 | }, |
bf9bccc1 | 766 | .type = ND_DRIVER_NAMESPACE_IO | ND_DRIVER_NAMESPACE_PMEM, |
9e853f23 RZ |
767 | }; |
768 | ||
03e90843 | 769 | module_nd_driver(nd_pmem_driver); |
9e853f23 RZ |
770 | |
771 | MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>"); | |
772 | MODULE_LICENSE("GPL v2"); |