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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" |
06e8ccda | 31 | #include "nd-core.h" |
9e853f23 | 32 | |
f284a4f2 DW |
33 | static struct device *to_dev(struct pmem_device *pmem) |
34 | { | |
35 | /* | |
36 | * nvdimm bus services need a 'dev' parameter, and we record the device | |
37 | * at init in bb.dev. | |
38 | */ | |
39 | return pmem->bb.dev; | |
40 | } | |
41 | ||
42 | static struct nd_region *to_region(struct pmem_device *pmem) | |
43 | { | |
44 | return to_nd_region(to_dev(pmem)->parent); | |
45 | } | |
9e853f23 | 46 | |
c953cc98 DW |
47 | static void hwpoison_clear(struct pmem_device *pmem, |
48 | phys_addr_t phys, unsigned int len) | |
49 | { | |
50 | unsigned long pfn_start, pfn_end, pfn; | |
51 | ||
52 | /* only pmem in the linear map supports HWPoison */ | |
53 | if (is_vmalloc_addr(pmem->virt_addr)) | |
54 | return; | |
55 | ||
56 | pfn_start = PHYS_PFN(phys); | |
57 | pfn_end = pfn_start + PHYS_PFN(len); | |
58 | for (pfn = pfn_start; pfn < pfn_end; pfn++) { | |
59 | struct page *page = pfn_to_page(pfn); | |
60 | ||
61 | /* | |
62 | * Note, no need to hold a get_dev_pagemap() reference | |
63 | * here since we're in the driver I/O path and | |
64 | * outstanding I/O requests pin the dev_pagemap. | |
65 | */ | |
66 | if (test_and_clear_pmem_poison(page)) | |
67 | clear_mce_nospec(pfn); | |
68 | } | |
69 | } | |
70 | ||
4e4cbee9 CH |
71 | static blk_status_t pmem_clear_poison(struct pmem_device *pmem, |
72 | phys_addr_t offset, unsigned int len) | |
59e64739 | 73 | { |
f284a4f2 | 74 | struct device *dev = to_dev(pmem); |
59e64739 DW |
75 | sector_t sector; |
76 | long cleared; | |
4e4cbee9 | 77 | blk_status_t rc = BLK_STS_OK; |
59e64739 DW |
78 | |
79 | sector = (offset - pmem->data_offset) / 512; | |
59e64739 | 80 | |
868f036f DW |
81 | cleared = nvdimm_clear_poison(dev, pmem->phys_addr + offset, len); |
82 | if (cleared < len) | |
4e4cbee9 | 83 | rc = BLK_STS_IOERR; |
59e64739 | 84 | if (cleared > 0 && cleared / 512) { |
c953cc98 | 85 | hwpoison_clear(pmem, pmem->phys_addr + offset, cleared); |
868f036f | 86 | cleared /= 512; |
426824d6 | 87 | dev_dbg(dev, "%#llx clear %ld sector%s\n", |
868f036f DW |
88 | (unsigned long long) sector, cleared, |
89 | cleared > 1 ? "s" : ""); | |
0a3f27b9 | 90 | badblocks_clear(&pmem->bb, sector, cleared); |
975750a9 TK |
91 | if (pmem->bb_state) |
92 | sysfs_notify_dirent(pmem->bb_state); | |
59e64739 | 93 | } |
3115bb02 | 94 | |
f2b61257 | 95 | arch_invalidate_pmem(pmem->virt_addr + offset, len); |
868f036f DW |
96 | |
97 | return rc; | |
59e64739 DW |
98 | } |
99 | ||
bd697a80 VV |
100 | static void write_pmem(void *pmem_addr, struct page *page, |
101 | unsigned int off, unsigned int len) | |
102 | { | |
98cc093c HY |
103 | unsigned int chunk; |
104 | void *mem; | |
105 | ||
106 | while (len) { | |
107 | mem = kmap_atomic(page); | |
9dc6488e | 108 | chunk = min_t(unsigned int, len, PAGE_SIZE - off); |
98cc093c HY |
109 | memcpy_flushcache(pmem_addr, mem + off, chunk); |
110 | kunmap_atomic(mem); | |
111 | len -= chunk; | |
112 | off = 0; | |
113 | page++; | |
9dc6488e | 114 | pmem_addr += chunk; |
98cc093c | 115 | } |
bd697a80 VV |
116 | } |
117 | ||
4e4cbee9 | 118 | static blk_status_t read_pmem(struct page *page, unsigned int off, |
bd697a80 VV |
119 | void *pmem_addr, unsigned int len) |
120 | { | |
98cc093c | 121 | unsigned int chunk; |
60622d68 | 122 | unsigned long rem; |
98cc093c HY |
123 | void *mem; |
124 | ||
125 | while (len) { | |
126 | mem = kmap_atomic(page); | |
9dc6488e | 127 | chunk = min_t(unsigned int, len, PAGE_SIZE - off); |
60622d68 | 128 | rem = memcpy_mcsafe(mem + off, pmem_addr, chunk); |
98cc093c | 129 | kunmap_atomic(mem); |
60622d68 | 130 | if (rem) |
98cc093c HY |
131 | return BLK_STS_IOERR; |
132 | len -= chunk; | |
133 | off = 0; | |
134 | page++; | |
9dc6488e | 135 | pmem_addr += chunk; |
98cc093c | 136 | } |
4e4cbee9 | 137 | return BLK_STS_OK; |
bd697a80 VV |
138 | } |
139 | ||
4e4cbee9 | 140 | static blk_status_t pmem_do_bvec(struct pmem_device *pmem, struct page *page, |
3f289dcb | 141 | unsigned int len, unsigned int off, unsigned int op, |
9e853f23 RZ |
142 | sector_t sector) |
143 | { | |
4e4cbee9 | 144 | blk_status_t rc = BLK_STS_OK; |
59e64739 | 145 | bool bad_pmem = false; |
32ab0a3f | 146 | phys_addr_t pmem_off = sector * 512 + pmem->data_offset; |
7a9eb206 | 147 | void *pmem_addr = pmem->virt_addr + pmem_off; |
9e853f23 | 148 | |
59e64739 DW |
149 | if (unlikely(is_bad_pmem(&pmem->bb, sector, len))) |
150 | bad_pmem = true; | |
151 | ||
3f289dcb | 152 | if (!op_is_write(op)) { |
59e64739 | 153 | if (unlikely(bad_pmem)) |
4e4cbee9 | 154 | rc = BLK_STS_IOERR; |
b5ebc8ec | 155 | else { |
bd697a80 | 156 | rc = read_pmem(page, off, pmem_addr, len); |
b5ebc8ec DW |
157 | flush_dcache_page(page); |
158 | } | |
9e853f23 | 159 | } else { |
0a370d26 DW |
160 | /* |
161 | * Note that we write the data both before and after | |
162 | * clearing poison. The write before clear poison | |
163 | * handles situations where the latest written data is | |
164 | * preserved and the clear poison operation simply marks | |
165 | * the address range as valid without changing the data. | |
166 | * In this case application software can assume that an | |
167 | * interrupted write will either return the new good | |
168 | * data or an error. | |
169 | * | |
170 | * However, if pmem_clear_poison() leaves the data in an | |
171 | * indeterminate state we need to perform the write | |
172 | * after clear poison. | |
173 | */ | |
9e853f23 | 174 | flush_dcache_page(page); |
bd697a80 | 175 | write_pmem(pmem_addr, page, off, len); |
59e64739 | 176 | if (unlikely(bad_pmem)) { |
3115bb02 | 177 | rc = pmem_clear_poison(pmem, pmem_off, len); |
bd697a80 | 178 | write_pmem(pmem_addr, page, off, len); |
59e64739 | 179 | } |
9e853f23 RZ |
180 | } |
181 | ||
b5ebc8ec | 182 | return rc; |
9e853f23 RZ |
183 | } |
184 | ||
dece1635 | 185 | static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio) |
9e853f23 | 186 | { |
c5d4355d | 187 | int ret = 0; |
4e4cbee9 | 188 | blk_status_t rc = 0; |
f0dc089c DW |
189 | bool do_acct; |
190 | unsigned long start; | |
9e853f23 | 191 | struct bio_vec bvec; |
9e853f23 | 192 | struct bvec_iter iter; |
bd842b8c | 193 | struct pmem_device *pmem = q->queuedata; |
7e267a8c DW |
194 | struct nd_region *nd_region = to_region(pmem); |
195 | ||
d2d6364d | 196 | if (bio->bi_opf & REQ_PREFLUSH) |
c5d4355d | 197 | ret = nvdimm_flush(nd_region, bio); |
9e853f23 | 198 | |
f0dc089c | 199 | do_acct = nd_iostat_start(bio, &start); |
e10624f8 DW |
200 | bio_for_each_segment(bvec, bio, iter) { |
201 | rc = pmem_do_bvec(pmem, bvec.bv_page, bvec.bv_len, | |
3f289dcb | 202 | bvec.bv_offset, bio_op(bio), iter.bi_sector); |
e10624f8 | 203 | if (rc) { |
4e4cbee9 | 204 | bio->bi_status = rc; |
e10624f8 DW |
205 | break; |
206 | } | |
207 | } | |
f0dc089c DW |
208 | if (do_acct) |
209 | nd_iostat_end(bio, start); | |
61031952 | 210 | |
1eff9d32 | 211 | if (bio->bi_opf & REQ_FUA) |
c5d4355d PG |
212 | ret = nvdimm_flush(nd_region, bio); |
213 | ||
214 | if (ret) | |
215 | bio->bi_status = errno_to_blk_status(ret); | |
61031952 | 216 | |
4246a0b6 | 217 | bio_endio(bio); |
dece1635 | 218 | return BLK_QC_T_NONE; |
9e853f23 RZ |
219 | } |
220 | ||
221 | static int pmem_rw_page(struct block_device *bdev, sector_t sector, | |
3f289dcb | 222 | struct page *page, unsigned int op) |
9e853f23 | 223 | { |
bd842b8c | 224 | struct pmem_device *pmem = bdev->bd_queue->queuedata; |
4e4cbee9 | 225 | blk_status_t rc; |
9e853f23 | 226 | |
98cc093c | 227 | rc = pmem_do_bvec(pmem, page, hpage_nr_pages(page) * PAGE_SIZE, |
3f289dcb | 228 | 0, op, sector); |
9e853f23 | 229 | |
e10624f8 DW |
230 | /* |
231 | * The ->rw_page interface is subtle and tricky. The core | |
232 | * retries on any error, so we can only invoke page_endio() in | |
233 | * the successful completion case. Otherwise, we'll see crashes | |
234 | * caused by double completion. | |
235 | */ | |
236 | if (rc == 0) | |
3f289dcb | 237 | page_endio(page, op_is_write(op), 0); |
e10624f8 | 238 | |
4e4cbee9 | 239 | return blk_status_to_errno(rc); |
9e853f23 RZ |
240 | } |
241 | ||
f295e53b | 242 | /* see "strong" declaration in tools/testing/nvdimm/pmem-dax.c */ |
c1d6e828 DW |
243 | __weak long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff, |
244 | long nr_pages, void **kaddr, pfn_t *pfn) | |
9e853f23 | 245 | { |
c1d6e828 | 246 | resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset; |
589e75d1 | 247 | |
c1d6e828 DW |
248 | if (unlikely(is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512, |
249 | PFN_PHYS(nr_pages)))) | |
0a70bd43 | 250 | return -EIO; |
46a590cd HY |
251 | |
252 | if (kaddr) | |
253 | *kaddr = pmem->virt_addr + offset; | |
254 | if (pfn) | |
255 | *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags); | |
9e853f23 | 256 | |
0a70bd43 DW |
257 | /* |
258 | * If badblocks are present, limit known good range to the | |
259 | * requested range. | |
260 | */ | |
261 | if (unlikely(pmem->bb.count)) | |
c1d6e828 DW |
262 | return nr_pages; |
263 | return PHYS_PFN(pmem->size - pmem->pfn_pad - offset); | |
9e853f23 RZ |
264 | } |
265 | ||
266 | static const struct block_device_operations pmem_fops = { | |
267 | .owner = THIS_MODULE, | |
268 | .rw_page = pmem_rw_page, | |
58138820 | 269 | .revalidate_disk = nvdimm_revalidate_disk, |
9e853f23 RZ |
270 | }; |
271 | ||
c1d6e828 DW |
272 | static long pmem_dax_direct_access(struct dax_device *dax_dev, |
273 | pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn) | |
274 | { | |
275 | struct pmem_device *pmem = dax_get_private(dax_dev); | |
276 | ||
277 | return __pmem_direct_access(pmem, pgoff, nr_pages, kaddr, pfn); | |
278 | } | |
279 | ||
52f476a3 DW |
280 | /* |
281 | * Use the 'no check' versions of copy_from_iter_flushcache() and | |
282 | * copy_to_iter_mcsafe() to bypass HARDENED_USERCOPY overhead. Bounds | |
283 | * checking, both file offset and device offset, is handled by | |
284 | * dax_iomap_actor() | |
285 | */ | |
0aed55af DW |
286 | static size_t pmem_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, |
287 | void *addr, size_t bytes, struct iov_iter *i) | |
288 | { | |
52f476a3 | 289 | return _copy_from_iter_flushcache(addr, bytes, i); |
0aed55af DW |
290 | } |
291 | ||
b3a9a0c3 DW |
292 | static size_t pmem_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff, |
293 | void *addr, size_t bytes, struct iov_iter *i) | |
294 | { | |
52f476a3 | 295 | return _copy_to_iter_mcsafe(addr, bytes, i); |
b3a9a0c3 DW |
296 | } |
297 | ||
c1d6e828 DW |
298 | static const struct dax_operations pmem_dax_ops = { |
299 | .direct_access = pmem_dax_direct_access, | |
7bf7eac8 | 300 | .dax_supported = generic_fsdax_supported, |
0aed55af | 301 | .copy_from_iter = pmem_copy_from_iter, |
b3a9a0c3 | 302 | .copy_to_iter = pmem_copy_to_iter, |
c1d6e828 DW |
303 | }; |
304 | ||
6e0c90d6 DW |
305 | static const struct attribute_group *pmem_attribute_groups[] = { |
306 | &dax_attribute_group, | |
307 | NULL, | |
c1d6e828 DW |
308 | }; |
309 | ||
d8668bb0 | 310 | static void pmem_pagemap_cleanup(struct dev_pagemap *pgmap) |
030b99e3 | 311 | { |
d8668bb0 CH |
312 | struct request_queue *q = |
313 | container_of(pgmap->ref, struct request_queue, q_usage_counter); | |
50f44ee7 | 314 | |
030b99e3 DW |
315 | blk_cleanup_queue(q); |
316 | } | |
317 | ||
d8668bb0 | 318 | static void pmem_release_queue(void *pgmap) |
50f44ee7 | 319 | { |
d8668bb0 | 320 | pmem_pagemap_cleanup(pgmap); |
50f44ee7 DW |
321 | } |
322 | ||
d8668bb0 | 323 | static void pmem_pagemap_kill(struct dev_pagemap *pgmap) |
71389703 | 324 | { |
d8668bb0 CH |
325 | struct request_queue *q = |
326 | container_of(pgmap->ref, struct request_queue, q_usage_counter); | |
a95c90f1 | 327 | |
d3b5d352 | 328 | blk_freeze_queue_start(q); |
71389703 DW |
329 | } |
330 | ||
c1d6e828 | 331 | static void pmem_release_disk(void *__pmem) |
030b99e3 | 332 | { |
c1d6e828 DW |
333 | struct pmem_device *pmem = __pmem; |
334 | ||
335 | kill_dax(pmem->dax_dev); | |
336 | put_dax(pmem->dax_dev); | |
337 | del_gendisk(pmem->disk); | |
338 | put_disk(pmem->disk); | |
030b99e3 DW |
339 | } |
340 | ||
80a72d0a | 341 | static void pmem_pagemap_page_free(struct page *page) |
e7638488 DW |
342 | { |
343 | wake_up_var(&page->_refcount); | |
344 | } | |
345 | ||
1e240e8d CH |
346 | static const struct dev_pagemap_ops fsdax_pagemap_ops = { |
347 | .page_free = pmem_pagemap_page_free, | |
348 | .kill = pmem_pagemap_kill, | |
349 | .cleanup = pmem_pagemap_cleanup, | |
350 | }; | |
351 | ||
200c79da DW |
352 | static int pmem_attach_disk(struct device *dev, |
353 | struct nd_namespace_common *ndns) | |
9e853f23 | 354 | { |
200c79da | 355 | struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); |
f284a4f2 | 356 | struct nd_region *nd_region = to_nd_region(dev->parent); |
ce7f11a2 | 357 | int nid = dev_to_node(dev), fua; |
200c79da | 358 | struct resource *res = &nsio->res; |
e8d51348 | 359 | struct resource bb_res; |
200c79da | 360 | struct nd_pfn *nd_pfn = NULL; |
c1d6e828 | 361 | struct dax_device *dax_dev; |
200c79da | 362 | struct nd_pfn_sb *pfn_sb; |
9e853f23 | 363 | struct pmem_device *pmem; |
468ded03 | 364 | struct request_queue *q; |
6e0c90d6 | 365 | struct device *gendev; |
200c79da DW |
366 | struct gendisk *disk; |
367 | void *addr; | |
e8d51348 | 368 | int rc; |
fefc1d97 | 369 | unsigned long flags = 0UL; |
e8d51348 CH |
370 | |
371 | pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL); | |
372 | if (!pmem) | |
373 | return -ENOMEM; | |
200c79da DW |
374 | |
375 | /* while nsio_rw_bytes is active, parse a pfn info block if present */ | |
376 | if (is_nd_pfn(dev)) { | |
377 | nd_pfn = to_nd_pfn(dev); | |
e8d51348 CH |
378 | rc = nvdimm_setup_pfn(nd_pfn, &pmem->pgmap); |
379 | if (rc) | |
380 | return rc; | |
200c79da DW |
381 | } |
382 | ||
383 | /* we're attaching a block device, disable raw namespace access */ | |
384 | devm_nsio_disable(dev, nsio); | |
9e853f23 | 385 | |
200c79da | 386 | dev_set_drvdata(dev, pmem); |
9e853f23 RZ |
387 | pmem->phys_addr = res->start; |
388 | pmem->size = resource_size(res); | |
0b277961 DW |
389 | fua = nvdimm_has_flush(nd_region); |
390 | if (!IS_ENABLED(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) || fua < 0) { | |
61031952 | 391 | dev_warn(dev, "unable to guarantee persistence of writes\n"); |
0b277961 DW |
392 | fua = 0; |
393 | } | |
9e853f23 | 394 | |
947df02d | 395 | if (!devm_request_mem_region(dev, res->start, resource_size(res), |
450c6633 | 396 | dev_name(&ndns->dev))) { |
947df02d | 397 | dev_warn(dev, "could not reserve region %pR\n", res); |
200c79da | 398 | return -EBUSY; |
9e853f23 RZ |
399 | } |
400 | ||
6d469642 | 401 | q = blk_alloc_queue_node(GFP_KERNEL, dev_to_node(dev)); |
468ded03 | 402 | if (!q) |
200c79da | 403 | return -ENOMEM; |
468ded03 | 404 | |
34c0fd54 | 405 | pmem->pfn_flags = PFN_DEV; |
e8d51348 | 406 | pmem->pgmap.ref = &q->q_usage_counter; |
200c79da | 407 | if (is_nd_pfn(dev)) { |
f6a55e1a CH |
408 | pmem->pgmap.type = MEMORY_DEVICE_FS_DAX; |
409 | pmem->pgmap.ops = &fsdax_pagemap_ops; | |
e8d51348 | 410 | addr = devm_memremap_pages(dev, &pmem->pgmap); |
200c79da DW |
411 | pfn_sb = nd_pfn->pfn_sb; |
412 | pmem->data_offset = le64_to_cpu(pfn_sb->dataoff); | |
e8d51348 CH |
413 | pmem->pfn_pad = resource_size(res) - |
414 | resource_size(&pmem->pgmap.res); | |
200c79da | 415 | pmem->pfn_flags |= PFN_MAP; |
e8d51348 CH |
416 | memcpy(&bb_res, &pmem->pgmap.res, sizeof(bb_res)); |
417 | bb_res.start += pmem->data_offset; | |
200c79da | 418 | } else if (pmem_should_map_pages(dev)) { |
e8d51348 | 419 | memcpy(&pmem->pgmap.res, &nsio->res, sizeof(pmem->pgmap.res)); |
f6a55e1a CH |
420 | pmem->pgmap.type = MEMORY_DEVICE_FS_DAX; |
421 | pmem->pgmap.ops = &fsdax_pagemap_ops; | |
e8d51348 | 422 | addr = devm_memremap_pages(dev, &pmem->pgmap); |
34c0fd54 | 423 | pmem->pfn_flags |= PFN_MAP; |
e8d51348 | 424 | memcpy(&bb_res, &pmem->pgmap.res, sizeof(bb_res)); |
91ed7ac4 | 425 | } else { |
50f44ee7 | 426 | if (devm_add_action_or_reset(dev, pmem_release_queue, |
d8668bb0 | 427 | &pmem->pgmap)) |
50f44ee7 | 428 | return -ENOMEM; |
200c79da DW |
429 | addr = devm_memremap(dev, pmem->phys_addr, |
430 | pmem->size, ARCH_MEMREMAP_PMEM); | |
91ed7ac4 DW |
431 | memcpy(&bb_res, &nsio->res, sizeof(bb_res)); |
432 | } | |
b36f4761 | 433 | |
200c79da DW |
434 | if (IS_ERR(addr)) |
435 | return PTR_ERR(addr); | |
7a9eb206 | 436 | pmem->virt_addr = addr; |
9e853f23 | 437 | |
ce7f11a2 | 438 | blk_queue_write_cache(q, true, fua); |
5a92289f DW |
439 | blk_queue_make_request(q, pmem_make_request); |
440 | blk_queue_physical_block_size(q, PAGE_SIZE); | |
f979b13c | 441 | blk_queue_logical_block_size(q, pmem_sector_size(ndns)); |
5a92289f | 442 | blk_queue_max_hw_sectors(q, UINT_MAX); |
8b904b5b | 443 | blk_queue_flag_set(QUEUE_FLAG_NONROT, q); |
4557641b RZ |
444 | if (pmem->pfn_flags & PFN_MAP) |
445 | blk_queue_flag_set(QUEUE_FLAG_DAX, q); | |
5a92289f | 446 | q->queuedata = pmem; |
9e853f23 | 447 | |
538ea4aa | 448 | disk = alloc_disk_node(0, nid); |
030b99e3 DW |
449 | if (!disk) |
450 | return -ENOMEM; | |
c1d6e828 | 451 | pmem->disk = disk; |
9e853f23 | 452 | |
9e853f23 | 453 | disk->fops = &pmem_fops; |
5a92289f | 454 | disk->queue = q; |
9e853f23 | 455 | disk->flags = GENHD_FL_EXT_DEVT; |
23c47d2a | 456 | disk->queue->backing_dev_info->capabilities |= BDI_CAP_SYNCHRONOUS_IO; |
5212e11f | 457 | nvdimm_namespace_disk_name(ndns, disk->disk_name); |
cfe30b87 DW |
458 | set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset) |
459 | / 512); | |
b95f5f43 DW |
460 | if (devm_init_badblocks(dev, &pmem->bb)) |
461 | return -ENOMEM; | |
e8d51348 | 462 | nvdimm_badblocks_populate(nd_region, &pmem->bb, &bb_res); |
57f7f317 | 463 | disk->bb = &pmem->bb; |
f02716db | 464 | |
fefc1d97 PG |
465 | if (is_nvdimm_sync(nd_region)) |
466 | flags = DAXDEV_F_SYNC; | |
467 | dax_dev = alloc_dax(pmem, disk->disk_name, &pmem_dax_ops, flags); | |
c1d6e828 DW |
468 | if (!dax_dev) { |
469 | put_disk(disk); | |
470 | return -ENOMEM; | |
471 | } | |
ce7f11a2 | 472 | dax_write_cache(dax_dev, nvdimm_has_cache(nd_region)); |
c1d6e828 | 473 | pmem->dax_dev = dax_dev; |
6e0c90d6 DW |
474 | gendev = disk_to_dev(disk); |
475 | gendev->groups = pmem_attribute_groups; | |
476 | ||
fef912bf | 477 | device_add_disk(dev, disk, NULL); |
c1d6e828 | 478 | if (devm_add_action_or_reset(dev, pmem_release_disk, pmem)) |
f02716db DW |
479 | return -ENOMEM; |
480 | ||
58138820 | 481 | revalidate_disk(disk); |
9e853f23 | 482 | |
975750a9 TK |
483 | pmem->bb_state = sysfs_get_dirent(disk_to_dev(disk)->kobj.sd, |
484 | "badblocks"); | |
6aa734a2 DW |
485 | if (!pmem->bb_state) |
486 | dev_warn(dev, "'badblocks' notification disabled\n"); | |
975750a9 | 487 | |
8c2f7e86 DW |
488 | return 0; |
489 | } | |
9e853f23 | 490 | |
9f53f9fa | 491 | static int nd_pmem_probe(struct device *dev) |
9e853f23 | 492 | { |
1c97afa7 | 493 | int ret; |
8c2f7e86 | 494 | struct nd_namespace_common *ndns; |
9e853f23 | 495 | |
8c2f7e86 DW |
496 | ndns = nvdimm_namespace_common_probe(dev); |
497 | if (IS_ERR(ndns)) | |
498 | return PTR_ERR(ndns); | |
bf9bccc1 | 499 | |
200c79da DW |
500 | if (devm_nsio_enable(dev, to_nd_namespace_io(&ndns->dev))) |
501 | return -ENXIO; | |
708ab62b | 502 | |
200c79da | 503 | if (is_nd_btt(dev)) |
708ab62b CH |
504 | return nvdimm_namespace_attach_btt(ndns); |
505 | ||
32ab0a3f | 506 | if (is_nd_pfn(dev)) |
200c79da | 507 | return pmem_attach_disk(dev, ndns); |
32ab0a3f | 508 | |
1c97afa7 AK |
509 | ret = nd_btt_probe(dev, ndns); |
510 | if (ret == 0) | |
32ab0a3f | 511 | return -ENXIO; |
32ab0a3f | 512 | |
1c97afa7 AK |
513 | /* |
514 | * We have two failure conditions here, there is no | |
515 | * info reserver block or we found a valid info reserve block | |
516 | * but failed to initialize the pfn superblock. | |
517 | * | |
518 | * For the first case consider namespace as a raw pmem namespace | |
519 | * and attach a disk. | |
520 | * | |
521 | * For the latter, consider this a success and advance the namespace | |
522 | * seed. | |
523 | */ | |
524 | ret = nd_pfn_probe(dev, ndns); | |
525 | if (ret == 0) | |
526 | return -ENXIO; | |
527 | else if (ret == -EOPNOTSUPP) | |
528 | return ret; | |
529 | ||
530 | ret = nd_dax_probe(dev, ndns); | |
531 | if (ret == 0) | |
532 | return -ENXIO; | |
533 | else if (ret == -EOPNOTSUPP) | |
534 | return ret; | |
200c79da | 535 | return pmem_attach_disk(dev, ndns); |
9e853f23 RZ |
536 | } |
537 | ||
9f53f9fa | 538 | static int nd_pmem_remove(struct device *dev) |
9e853f23 | 539 | { |
6aa734a2 DW |
540 | struct pmem_device *pmem = dev_get_drvdata(dev); |
541 | ||
8c2f7e86 | 542 | if (is_nd_btt(dev)) |
298f2bc5 | 543 | nvdimm_namespace_detach_btt(to_nd_btt(dev)); |
6aa734a2 DW |
544 | else { |
545 | /* | |
87a30e1f DW |
546 | * Note, this assumes nd_device_lock() context to not |
547 | * race nd_pmem_notify() | |
6aa734a2 DW |
548 | */ |
549 | sysfs_put(pmem->bb_state); | |
550 | pmem->bb_state = NULL; | |
551 | } | |
c5d4355d | 552 | nvdimm_flush(to_nd_region(dev->parent), NULL); |
476f848a | 553 | |
9e853f23 RZ |
554 | return 0; |
555 | } | |
556 | ||
476f848a DW |
557 | static void nd_pmem_shutdown(struct device *dev) |
558 | { | |
c5d4355d | 559 | nvdimm_flush(to_nd_region(dev->parent), NULL); |
476f848a DW |
560 | } |
561 | ||
71999466 DW |
562 | static void nd_pmem_notify(struct device *dev, enum nvdimm_event event) |
563 | { | |
b2518c78 | 564 | struct nd_region *nd_region; |
298f2bc5 DW |
565 | resource_size_t offset = 0, end_trunc = 0; |
566 | struct nd_namespace_common *ndns; | |
567 | struct nd_namespace_io *nsio; | |
568 | struct resource res; | |
b2518c78 | 569 | struct badblocks *bb; |
975750a9 | 570 | struct kernfs_node *bb_state; |
71999466 DW |
571 | |
572 | if (event != NVDIMM_REVALIDATE_POISON) | |
573 | return; | |
574 | ||
298f2bc5 DW |
575 | if (is_nd_btt(dev)) { |
576 | struct nd_btt *nd_btt = to_nd_btt(dev); | |
577 | ||
578 | ndns = nd_btt->ndns; | |
b2518c78 TK |
579 | nd_region = to_nd_region(ndns->dev.parent); |
580 | nsio = to_nd_namespace_io(&ndns->dev); | |
581 | bb = &nsio->bb; | |
975750a9 | 582 | bb_state = NULL; |
b2518c78 TK |
583 | } else { |
584 | struct pmem_device *pmem = dev_get_drvdata(dev); | |
a3901802 | 585 | |
b2518c78 TK |
586 | nd_region = to_region(pmem); |
587 | bb = &pmem->bb; | |
975750a9 | 588 | bb_state = pmem->bb_state; |
b2518c78 TK |
589 | |
590 | if (is_nd_pfn(dev)) { | |
591 | struct nd_pfn *nd_pfn = to_nd_pfn(dev); | |
592 | struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb; | |
593 | ||
594 | ndns = nd_pfn->ndns; | |
595 | offset = pmem->data_offset + | |
596 | __le32_to_cpu(pfn_sb->start_pad); | |
597 | end_trunc = __le32_to_cpu(pfn_sb->end_trunc); | |
598 | } else { | |
599 | ndns = to_ndns(dev); | |
600 | } | |
601 | ||
602 | nsio = to_nd_namespace_io(&ndns->dev); | |
603 | } | |
a3901802 | 604 | |
298f2bc5 DW |
605 | res.start = nsio->res.start + offset; |
606 | res.end = nsio->res.end - end_trunc; | |
b2518c78 | 607 | nvdimm_badblocks_populate(nd_region, bb, &res); |
975750a9 TK |
608 | if (bb_state) |
609 | sysfs_notify_dirent(bb_state); | |
71999466 DW |
610 | } |
611 | ||
9f53f9fa DW |
612 | MODULE_ALIAS("pmem"); |
613 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO); | |
bf9bccc1 | 614 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM); |
9f53f9fa DW |
615 | static struct nd_device_driver nd_pmem_driver = { |
616 | .probe = nd_pmem_probe, | |
617 | .remove = nd_pmem_remove, | |
71999466 | 618 | .notify = nd_pmem_notify, |
476f848a | 619 | .shutdown = nd_pmem_shutdown, |
9f53f9fa DW |
620 | .drv = { |
621 | .name = "nd_pmem", | |
9e853f23 | 622 | }, |
bf9bccc1 | 623 | .type = ND_DRIVER_NAMESPACE_IO | ND_DRIVER_NAMESPACE_PMEM, |
9e853f23 RZ |
624 | }; |
625 | ||
03e90843 | 626 | module_nd_driver(nd_pmem_driver); |
9e853f23 RZ |
627 | |
628 | MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>"); | |
629 | MODULE_LICENSE("GPL v2"); |