Commit | Line | Data |
---|---|---|
21d34711 CH |
1 | /* |
2 | * NVM Express device driver | |
3 | * Copyright (c) 2011-2014, Intel Corporation. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | */ | |
14 | ||
15 | #include <linux/blkdev.h> | |
16 | #include <linux/blk-mq.h> | |
5fd4ce1b | 17 | #include <linux/delay.h> |
21d34711 | 18 | #include <linux/errno.h> |
1673f1f0 | 19 | #include <linux/hdreg.h> |
21d34711 | 20 | #include <linux/kernel.h> |
5bae7f73 CH |
21 | #include <linux/module.h> |
22 | #include <linux/list_sort.h> | |
21d34711 CH |
23 | #include <linux/slab.h> |
24 | #include <linux/types.h> | |
1673f1f0 CH |
25 | #include <linux/pr.h> |
26 | #include <linux/ptrace.h> | |
27 | #include <linux/nvme_ioctl.h> | |
28 | #include <linux/t10-pi.h> | |
29 | #include <scsi/sg.h> | |
30 | #include <asm/unaligned.h> | |
21d34711 CH |
31 | |
32 | #include "nvme.h" | |
33 | ||
f3ca80fc CH |
34 | #define NVME_MINORS (1U << MINORBITS) |
35 | ||
5bae7f73 CH |
36 | static int nvme_major; |
37 | module_param(nvme_major, int, 0); | |
38 | ||
f3ca80fc CH |
39 | static int nvme_char_major; |
40 | module_param(nvme_char_major, int, 0); | |
41 | ||
42 | static LIST_HEAD(nvme_ctrl_list); | |
1673f1f0 CH |
43 | DEFINE_SPINLOCK(dev_list_lock); |
44 | ||
f3ca80fc CH |
45 | static struct class *nvme_class; |
46 | ||
1673f1f0 CH |
47 | static void nvme_free_ns(struct kref *kref) |
48 | { | |
49 | struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref); | |
50 | ||
51 | if (ns->type == NVME_NS_LIGHTNVM) | |
52 | nvme_nvm_unregister(ns->queue, ns->disk->disk_name); | |
53 | ||
54 | spin_lock(&dev_list_lock); | |
55 | ns->disk->private_data = NULL; | |
56 | spin_unlock(&dev_list_lock); | |
57 | ||
58 | nvme_put_ctrl(ns->ctrl); | |
59 | put_disk(ns->disk); | |
60 | kfree(ns); | |
61 | } | |
62 | ||
5bae7f73 | 63 | static void nvme_put_ns(struct nvme_ns *ns) |
1673f1f0 CH |
64 | { |
65 | kref_put(&ns->kref, nvme_free_ns); | |
66 | } | |
67 | ||
68 | static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk) | |
69 | { | |
70 | struct nvme_ns *ns; | |
71 | ||
72 | spin_lock(&dev_list_lock); | |
73 | ns = disk->private_data; | |
74 | if (ns && !kref_get_unless_zero(&ns->kref)) | |
75 | ns = NULL; | |
76 | spin_unlock(&dev_list_lock); | |
77 | ||
78 | return ns; | |
79 | } | |
80 | ||
7688faa6 CH |
81 | void nvme_requeue_req(struct request *req) |
82 | { | |
83 | unsigned long flags; | |
84 | ||
85 | blk_mq_requeue_request(req); | |
86 | spin_lock_irqsave(req->q->queue_lock, flags); | |
87 | if (!blk_queue_stopped(req->q)) | |
88 | blk_mq_kick_requeue_list(req->q); | |
89 | spin_unlock_irqrestore(req->q->queue_lock, flags); | |
90 | } | |
91 | ||
4160982e CH |
92 | struct request *nvme_alloc_request(struct request_queue *q, |
93 | struct nvme_command *cmd, unsigned int flags) | |
21d34711 CH |
94 | { |
95 | bool write = cmd->common.opcode & 1; | |
21d34711 | 96 | struct request *req; |
21d34711 | 97 | |
4160982e | 98 | req = blk_mq_alloc_request(q, write, flags); |
21d34711 | 99 | if (IS_ERR(req)) |
4160982e | 100 | return req; |
21d34711 CH |
101 | |
102 | req->cmd_type = REQ_TYPE_DRV_PRIV; | |
103 | req->cmd_flags |= REQ_FAILFAST_DRIVER; | |
104 | req->__data_len = 0; | |
105 | req->__sector = (sector_t) -1; | |
106 | req->bio = req->biotail = NULL; | |
107 | ||
21d34711 CH |
108 | req->cmd = (unsigned char *)cmd; |
109 | req->cmd_len = sizeof(struct nvme_command); | |
110 | req->special = (void *)0; | |
111 | ||
4160982e CH |
112 | return req; |
113 | } | |
114 | ||
115 | /* | |
116 | * Returns 0 on success. If the result is negative, it's a Linux error code; | |
117 | * if the result is positive, it's an NVM Express status code | |
118 | */ | |
119 | int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, | |
120 | void *buffer, unsigned bufflen, u32 *result, unsigned timeout) | |
121 | { | |
122 | struct request *req; | |
123 | int ret; | |
124 | ||
125 | req = nvme_alloc_request(q, cmd, 0); | |
126 | if (IS_ERR(req)) | |
127 | return PTR_ERR(req); | |
128 | ||
129 | req->timeout = timeout ? timeout : ADMIN_TIMEOUT; | |
130 | ||
21d34711 CH |
131 | if (buffer && bufflen) { |
132 | ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL); | |
133 | if (ret) | |
134 | goto out; | |
4160982e CH |
135 | } |
136 | ||
137 | blk_execute_rq(req->q, NULL, req, 0); | |
138 | if (result) | |
139 | *result = (u32)(uintptr_t)req->special; | |
140 | ret = req->errors; | |
141 | out: | |
142 | blk_mq_free_request(req); | |
143 | return ret; | |
144 | } | |
145 | ||
146 | int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, | |
147 | void *buffer, unsigned bufflen) | |
148 | { | |
149 | return __nvme_submit_sync_cmd(q, cmd, buffer, bufflen, NULL, 0); | |
150 | } | |
151 | ||
0b7f1f26 KB |
152 | int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd, |
153 | void __user *ubuffer, unsigned bufflen, | |
154 | void __user *meta_buffer, unsigned meta_len, u32 meta_seed, | |
155 | u32 *result, unsigned timeout) | |
4160982e | 156 | { |
0b7f1f26 KB |
157 | bool write = cmd->common.opcode & 1; |
158 | struct nvme_ns *ns = q->queuedata; | |
159 | struct gendisk *disk = ns ? ns->disk : NULL; | |
4160982e | 160 | struct request *req; |
0b7f1f26 KB |
161 | struct bio *bio = NULL; |
162 | void *meta = NULL; | |
4160982e CH |
163 | int ret; |
164 | ||
165 | req = nvme_alloc_request(q, cmd, 0); | |
166 | if (IS_ERR(req)) | |
167 | return PTR_ERR(req); | |
168 | ||
169 | req->timeout = timeout ? timeout : ADMIN_TIMEOUT; | |
170 | ||
171 | if (ubuffer && bufflen) { | |
21d34711 CH |
172 | ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen, |
173 | GFP_KERNEL); | |
174 | if (ret) | |
175 | goto out; | |
176 | bio = req->bio; | |
21d34711 | 177 | |
0b7f1f26 KB |
178 | if (!disk) |
179 | goto submit; | |
180 | bio->bi_bdev = bdget_disk(disk, 0); | |
181 | if (!bio->bi_bdev) { | |
182 | ret = -ENODEV; | |
183 | goto out_unmap; | |
184 | } | |
185 | ||
186 | if (meta_buffer) { | |
187 | struct bio_integrity_payload *bip; | |
188 | ||
189 | meta = kmalloc(meta_len, GFP_KERNEL); | |
190 | if (!meta) { | |
191 | ret = -ENOMEM; | |
192 | goto out_unmap; | |
193 | } | |
194 | ||
195 | if (write) { | |
196 | if (copy_from_user(meta, meta_buffer, | |
197 | meta_len)) { | |
198 | ret = -EFAULT; | |
199 | goto out_free_meta; | |
200 | } | |
201 | } | |
202 | ||
203 | bip = bio_integrity_alloc(bio, GFP_KERNEL, 1); | |
06c1e390 KB |
204 | if (IS_ERR(bip)) { |
205 | ret = PTR_ERR(bip); | |
0b7f1f26 KB |
206 | goto out_free_meta; |
207 | } | |
208 | ||
209 | bip->bip_iter.bi_size = meta_len; | |
210 | bip->bip_iter.bi_sector = meta_seed; | |
211 | ||
212 | ret = bio_integrity_add_page(bio, virt_to_page(meta), | |
213 | meta_len, offset_in_page(meta)); | |
214 | if (ret != meta_len) { | |
215 | ret = -ENOMEM; | |
216 | goto out_free_meta; | |
217 | } | |
218 | } | |
219 | } | |
220 | submit: | |
221 | blk_execute_rq(req->q, disk, req, 0); | |
222 | ret = req->errors; | |
21d34711 CH |
223 | if (result) |
224 | *result = (u32)(uintptr_t)req->special; | |
0b7f1f26 KB |
225 | if (meta && !ret && !write) { |
226 | if (copy_to_user(meta_buffer, meta, meta_len)) | |
227 | ret = -EFAULT; | |
228 | } | |
229 | out_free_meta: | |
230 | kfree(meta); | |
231 | out_unmap: | |
232 | if (bio) { | |
233 | if (disk && bio->bi_bdev) | |
234 | bdput(bio->bi_bdev); | |
235 | blk_rq_unmap_user(bio); | |
236 | } | |
21d34711 CH |
237 | out: |
238 | blk_mq_free_request(req); | |
239 | return ret; | |
240 | } | |
241 | ||
0b7f1f26 KB |
242 | int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd, |
243 | void __user *ubuffer, unsigned bufflen, u32 *result, | |
244 | unsigned timeout) | |
245 | { | |
246 | return __nvme_submit_user_cmd(q, cmd, ubuffer, bufflen, NULL, 0, 0, | |
247 | result, timeout); | |
248 | } | |
249 | ||
1c63dc66 | 250 | int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id) |
21d34711 CH |
251 | { |
252 | struct nvme_command c = { }; | |
253 | int error; | |
254 | ||
255 | /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ | |
256 | c.identify.opcode = nvme_admin_identify; | |
257 | c.identify.cns = cpu_to_le32(1); | |
258 | ||
259 | *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL); | |
260 | if (!*id) | |
261 | return -ENOMEM; | |
262 | ||
263 | error = nvme_submit_sync_cmd(dev->admin_q, &c, *id, | |
264 | sizeof(struct nvme_id_ctrl)); | |
265 | if (error) | |
266 | kfree(*id); | |
267 | return error; | |
268 | } | |
269 | ||
540c801c KB |
270 | static int nvme_identify_ns_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *ns_list) |
271 | { | |
272 | struct nvme_command c = { }; | |
273 | ||
274 | c.identify.opcode = nvme_admin_identify; | |
275 | c.identify.cns = cpu_to_le32(2); | |
276 | c.identify.nsid = cpu_to_le32(nsid); | |
277 | return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list, 0x1000); | |
278 | } | |
279 | ||
1c63dc66 | 280 | int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid, |
21d34711 CH |
281 | struct nvme_id_ns **id) |
282 | { | |
283 | struct nvme_command c = { }; | |
284 | int error; | |
285 | ||
286 | /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ | |
287 | c.identify.opcode = nvme_admin_identify, | |
288 | c.identify.nsid = cpu_to_le32(nsid), | |
289 | ||
290 | *id = kmalloc(sizeof(struct nvme_id_ns), GFP_KERNEL); | |
291 | if (!*id) | |
292 | return -ENOMEM; | |
293 | ||
294 | error = nvme_submit_sync_cmd(dev->admin_q, &c, *id, | |
295 | sizeof(struct nvme_id_ns)); | |
296 | if (error) | |
297 | kfree(*id); | |
298 | return error; | |
299 | } | |
300 | ||
1c63dc66 | 301 | int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid, |
21d34711 CH |
302 | dma_addr_t dma_addr, u32 *result) |
303 | { | |
304 | struct nvme_command c; | |
305 | ||
306 | memset(&c, 0, sizeof(c)); | |
307 | c.features.opcode = nvme_admin_get_features; | |
308 | c.features.nsid = cpu_to_le32(nsid); | |
309 | c.features.prp1 = cpu_to_le64(dma_addr); | |
310 | c.features.fid = cpu_to_le32(fid); | |
311 | ||
4160982e | 312 | return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0, result, 0); |
21d34711 CH |
313 | } |
314 | ||
1c63dc66 | 315 | int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11, |
21d34711 CH |
316 | dma_addr_t dma_addr, u32 *result) |
317 | { | |
318 | struct nvme_command c; | |
319 | ||
320 | memset(&c, 0, sizeof(c)); | |
321 | c.features.opcode = nvme_admin_set_features; | |
322 | c.features.prp1 = cpu_to_le64(dma_addr); | |
323 | c.features.fid = cpu_to_le32(fid); | |
324 | c.features.dword11 = cpu_to_le32(dword11); | |
325 | ||
4160982e | 326 | return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0, result, 0); |
21d34711 CH |
327 | } |
328 | ||
1c63dc66 | 329 | int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log) |
21d34711 CH |
330 | { |
331 | struct nvme_command c = { }; | |
332 | int error; | |
333 | ||
334 | c.common.opcode = nvme_admin_get_log_page, | |
335 | c.common.nsid = cpu_to_le32(0xFFFFFFFF), | |
336 | c.common.cdw10[0] = cpu_to_le32( | |
337 | (((sizeof(struct nvme_smart_log) / 4) - 1) << 16) | | |
338 | NVME_LOG_SMART), | |
339 | ||
340 | *log = kmalloc(sizeof(struct nvme_smart_log), GFP_KERNEL); | |
341 | if (!*log) | |
342 | return -ENOMEM; | |
343 | ||
344 | error = nvme_submit_sync_cmd(dev->admin_q, &c, *log, | |
345 | sizeof(struct nvme_smart_log)); | |
346 | if (error) | |
347 | kfree(*log); | |
348 | return error; | |
349 | } | |
1673f1f0 | 350 | |
9a0be7ab CH |
351 | int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count) |
352 | { | |
353 | u32 q_count = (*count - 1) | ((*count - 1) << 16); | |
354 | u32 result; | |
355 | int status, nr_io_queues; | |
356 | ||
357 | status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, 0, | |
358 | &result); | |
359 | if (status) | |
360 | return status; | |
361 | ||
362 | nr_io_queues = min(result & 0xffff, result >> 16) + 1; | |
363 | *count = min(*count, nr_io_queues); | |
364 | return 0; | |
365 | } | |
366 | ||
1673f1f0 CH |
367 | static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio) |
368 | { | |
369 | struct nvme_user_io io; | |
370 | struct nvme_command c; | |
371 | unsigned length, meta_len; | |
372 | void __user *metadata; | |
373 | ||
374 | if (copy_from_user(&io, uio, sizeof(io))) | |
375 | return -EFAULT; | |
376 | ||
377 | switch (io.opcode) { | |
378 | case nvme_cmd_write: | |
379 | case nvme_cmd_read: | |
380 | case nvme_cmd_compare: | |
381 | break; | |
382 | default: | |
383 | return -EINVAL; | |
384 | } | |
385 | ||
386 | length = (io.nblocks + 1) << ns->lba_shift; | |
387 | meta_len = (io.nblocks + 1) * ns->ms; | |
388 | metadata = (void __user *)(uintptr_t)io.metadata; | |
389 | ||
390 | if (ns->ext) { | |
391 | length += meta_len; | |
392 | meta_len = 0; | |
393 | } else if (meta_len) { | |
394 | if ((io.metadata & 3) || !io.metadata) | |
395 | return -EINVAL; | |
396 | } | |
397 | ||
398 | memset(&c, 0, sizeof(c)); | |
399 | c.rw.opcode = io.opcode; | |
400 | c.rw.flags = io.flags; | |
401 | c.rw.nsid = cpu_to_le32(ns->ns_id); | |
402 | c.rw.slba = cpu_to_le64(io.slba); | |
403 | c.rw.length = cpu_to_le16(io.nblocks); | |
404 | c.rw.control = cpu_to_le16(io.control); | |
405 | c.rw.dsmgmt = cpu_to_le32(io.dsmgmt); | |
406 | c.rw.reftag = cpu_to_le32(io.reftag); | |
407 | c.rw.apptag = cpu_to_le16(io.apptag); | |
408 | c.rw.appmask = cpu_to_le16(io.appmask); | |
409 | ||
410 | return __nvme_submit_user_cmd(ns->queue, &c, | |
411 | (void __user *)(uintptr_t)io.addr, length, | |
412 | metadata, meta_len, io.slba, NULL, 0); | |
413 | } | |
414 | ||
f3ca80fc | 415 | static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns, |
1673f1f0 CH |
416 | struct nvme_passthru_cmd __user *ucmd) |
417 | { | |
418 | struct nvme_passthru_cmd cmd; | |
419 | struct nvme_command c; | |
420 | unsigned timeout = 0; | |
421 | int status; | |
422 | ||
423 | if (!capable(CAP_SYS_ADMIN)) | |
424 | return -EACCES; | |
425 | if (copy_from_user(&cmd, ucmd, sizeof(cmd))) | |
426 | return -EFAULT; | |
427 | ||
428 | memset(&c, 0, sizeof(c)); | |
429 | c.common.opcode = cmd.opcode; | |
430 | c.common.flags = cmd.flags; | |
431 | c.common.nsid = cpu_to_le32(cmd.nsid); | |
432 | c.common.cdw2[0] = cpu_to_le32(cmd.cdw2); | |
433 | c.common.cdw2[1] = cpu_to_le32(cmd.cdw3); | |
434 | c.common.cdw10[0] = cpu_to_le32(cmd.cdw10); | |
435 | c.common.cdw10[1] = cpu_to_le32(cmd.cdw11); | |
436 | c.common.cdw10[2] = cpu_to_le32(cmd.cdw12); | |
437 | c.common.cdw10[3] = cpu_to_le32(cmd.cdw13); | |
438 | c.common.cdw10[4] = cpu_to_le32(cmd.cdw14); | |
439 | c.common.cdw10[5] = cpu_to_le32(cmd.cdw15); | |
440 | ||
441 | if (cmd.timeout_ms) | |
442 | timeout = msecs_to_jiffies(cmd.timeout_ms); | |
443 | ||
444 | status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c, | |
d1ea7be5 | 445 | (void __user *)(uintptr_t)cmd.addr, cmd.data_len, |
1673f1f0 CH |
446 | &cmd.result, timeout); |
447 | if (status >= 0) { | |
448 | if (put_user(cmd.result, &ucmd->result)) | |
449 | return -EFAULT; | |
450 | } | |
451 | ||
452 | return status; | |
453 | } | |
454 | ||
455 | static int nvme_ioctl(struct block_device *bdev, fmode_t mode, | |
456 | unsigned int cmd, unsigned long arg) | |
457 | { | |
458 | struct nvme_ns *ns = bdev->bd_disk->private_data; | |
459 | ||
460 | switch (cmd) { | |
461 | case NVME_IOCTL_ID: | |
462 | force_successful_syscall_return(); | |
463 | return ns->ns_id; | |
464 | case NVME_IOCTL_ADMIN_CMD: | |
465 | return nvme_user_cmd(ns->ctrl, NULL, (void __user *)arg); | |
466 | case NVME_IOCTL_IO_CMD: | |
467 | return nvme_user_cmd(ns->ctrl, ns, (void __user *)arg); | |
468 | case NVME_IOCTL_SUBMIT_IO: | |
469 | return nvme_submit_io(ns, (void __user *)arg); | |
44907332 | 470 | #ifdef CONFIG_BLK_DEV_NVME_SCSI |
1673f1f0 CH |
471 | case SG_GET_VERSION_NUM: |
472 | return nvme_sg_get_version_num((void __user *)arg); | |
473 | case SG_IO: | |
474 | return nvme_sg_io(ns, (void __user *)arg); | |
44907332 | 475 | #endif |
1673f1f0 CH |
476 | default: |
477 | return -ENOTTY; | |
478 | } | |
479 | } | |
480 | ||
481 | #ifdef CONFIG_COMPAT | |
482 | static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
483 | unsigned int cmd, unsigned long arg) | |
484 | { | |
485 | switch (cmd) { | |
486 | case SG_IO: | |
487 | return -ENOIOCTLCMD; | |
488 | } | |
489 | return nvme_ioctl(bdev, mode, cmd, arg); | |
490 | } | |
491 | #else | |
492 | #define nvme_compat_ioctl NULL | |
493 | #endif | |
494 | ||
495 | static int nvme_open(struct block_device *bdev, fmode_t mode) | |
496 | { | |
497 | return nvme_get_ns_from_disk(bdev->bd_disk) ? 0 : -ENXIO; | |
498 | } | |
499 | ||
500 | static void nvme_release(struct gendisk *disk, fmode_t mode) | |
501 | { | |
502 | nvme_put_ns(disk->private_data); | |
503 | } | |
504 | ||
505 | static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
506 | { | |
507 | /* some standard values */ | |
508 | geo->heads = 1 << 6; | |
509 | geo->sectors = 1 << 5; | |
510 | geo->cylinders = get_capacity(bdev->bd_disk) >> 11; | |
511 | return 0; | |
512 | } | |
513 | ||
514 | #ifdef CONFIG_BLK_DEV_INTEGRITY | |
515 | static void nvme_init_integrity(struct nvme_ns *ns) | |
516 | { | |
517 | struct blk_integrity integrity; | |
518 | ||
519 | switch (ns->pi_type) { | |
520 | case NVME_NS_DPS_PI_TYPE3: | |
521 | integrity.profile = &t10_pi_type3_crc; | |
522 | break; | |
523 | case NVME_NS_DPS_PI_TYPE1: | |
524 | case NVME_NS_DPS_PI_TYPE2: | |
525 | integrity.profile = &t10_pi_type1_crc; | |
526 | break; | |
527 | default: | |
528 | integrity.profile = NULL; | |
529 | break; | |
530 | } | |
531 | integrity.tuple_size = ns->ms; | |
532 | blk_integrity_register(ns->disk, &integrity); | |
533 | blk_queue_max_integrity_segments(ns->queue, 1); | |
534 | } | |
535 | #else | |
536 | static void nvme_init_integrity(struct nvme_ns *ns) | |
537 | { | |
538 | } | |
539 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
540 | ||
541 | static void nvme_config_discard(struct nvme_ns *ns) | |
542 | { | |
543 | u32 logical_block_size = queue_logical_block_size(ns->queue); | |
544 | ns->queue->limits.discard_zeroes_data = 0; | |
545 | ns->queue->limits.discard_alignment = logical_block_size; | |
546 | ns->queue->limits.discard_granularity = logical_block_size; | |
547 | blk_queue_max_discard_sectors(ns->queue, 0xffffffff); | |
548 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue); | |
549 | } | |
550 | ||
5bae7f73 | 551 | static int nvme_revalidate_disk(struct gendisk *disk) |
1673f1f0 CH |
552 | { |
553 | struct nvme_ns *ns = disk->private_data; | |
554 | struct nvme_id_ns *id; | |
555 | u8 lbaf, pi_type; | |
556 | u16 old_ms; | |
557 | unsigned short bs; | |
558 | ||
559 | if (nvme_identify_ns(ns->ctrl, ns->ns_id, &id)) { | |
560 | dev_warn(ns->ctrl->dev, "%s: Identify failure nvme%dn%d\n", | |
561 | __func__, ns->ctrl->instance, ns->ns_id); | |
562 | return -ENODEV; | |
563 | } | |
564 | if (id->ncap == 0) { | |
565 | kfree(id); | |
566 | return -ENODEV; | |
567 | } | |
568 | ||
569 | if (nvme_nvm_ns_supported(ns, id) && ns->type != NVME_NS_LIGHTNVM) { | |
570 | if (nvme_nvm_register(ns->queue, disk->disk_name)) { | |
571 | dev_warn(ns->ctrl->dev, | |
572 | "%s: LightNVM init failure\n", __func__); | |
573 | kfree(id); | |
574 | return -ENODEV; | |
575 | } | |
576 | ns->type = NVME_NS_LIGHTNVM; | |
577 | } | |
578 | ||
2b9b6e86 KB |
579 | if (ns->ctrl->vs >= NVME_VS(1, 1)) |
580 | memcpy(ns->eui, id->eui64, sizeof(ns->eui)); | |
581 | if (ns->ctrl->vs >= NVME_VS(1, 2)) | |
582 | memcpy(ns->uuid, id->nguid, sizeof(ns->uuid)); | |
583 | ||
1673f1f0 CH |
584 | old_ms = ns->ms; |
585 | lbaf = id->flbas & NVME_NS_FLBAS_LBA_MASK; | |
586 | ns->lba_shift = id->lbaf[lbaf].ds; | |
587 | ns->ms = le16_to_cpu(id->lbaf[lbaf].ms); | |
588 | ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT); | |
589 | ||
590 | /* | |
591 | * If identify namespace failed, use default 512 byte block size so | |
592 | * block layer can use before failing read/write for 0 capacity. | |
593 | */ | |
594 | if (ns->lba_shift == 0) | |
595 | ns->lba_shift = 9; | |
596 | bs = 1 << ns->lba_shift; | |
1673f1f0 CH |
597 | /* XXX: PI implementation requires metadata equal t10 pi tuple size */ |
598 | pi_type = ns->ms == sizeof(struct t10_pi_tuple) ? | |
599 | id->dps & NVME_NS_DPS_PI_MASK : 0; | |
600 | ||
601 | blk_mq_freeze_queue(disk->queue); | |
602 | if (blk_get_integrity(disk) && (ns->pi_type != pi_type || | |
603 | ns->ms != old_ms || | |
604 | bs != queue_logical_block_size(disk->queue) || | |
605 | (ns->ms && ns->ext))) | |
606 | blk_integrity_unregister(disk); | |
607 | ||
608 | ns->pi_type = pi_type; | |
609 | blk_queue_logical_block_size(ns->queue, bs); | |
610 | ||
4b9d5b15 | 611 | if (ns->ms && !blk_get_integrity(disk) && !ns->ext) |
1673f1f0 | 612 | nvme_init_integrity(ns); |
1673f1f0 CH |
613 | if (ns->ms && !(ns->ms == 8 && ns->pi_type) && !blk_get_integrity(disk)) |
614 | set_capacity(disk, 0); | |
615 | else | |
616 | set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9)); | |
617 | ||
618 | if (ns->ctrl->oncs & NVME_CTRL_ONCS_DSM) | |
619 | nvme_config_discard(ns); | |
620 | blk_mq_unfreeze_queue(disk->queue); | |
621 | ||
622 | kfree(id); | |
623 | return 0; | |
624 | } | |
625 | ||
626 | static char nvme_pr_type(enum pr_type type) | |
627 | { | |
628 | switch (type) { | |
629 | case PR_WRITE_EXCLUSIVE: | |
630 | return 1; | |
631 | case PR_EXCLUSIVE_ACCESS: | |
632 | return 2; | |
633 | case PR_WRITE_EXCLUSIVE_REG_ONLY: | |
634 | return 3; | |
635 | case PR_EXCLUSIVE_ACCESS_REG_ONLY: | |
636 | return 4; | |
637 | case PR_WRITE_EXCLUSIVE_ALL_REGS: | |
638 | return 5; | |
639 | case PR_EXCLUSIVE_ACCESS_ALL_REGS: | |
640 | return 6; | |
641 | default: | |
642 | return 0; | |
643 | } | |
644 | }; | |
645 | ||
646 | static int nvme_pr_command(struct block_device *bdev, u32 cdw10, | |
647 | u64 key, u64 sa_key, u8 op) | |
648 | { | |
649 | struct nvme_ns *ns = bdev->bd_disk->private_data; | |
650 | struct nvme_command c; | |
651 | u8 data[16] = { 0, }; | |
652 | ||
653 | put_unaligned_le64(key, &data[0]); | |
654 | put_unaligned_le64(sa_key, &data[8]); | |
655 | ||
656 | memset(&c, 0, sizeof(c)); | |
657 | c.common.opcode = op; | |
658 | c.common.nsid = cpu_to_le32(ns->ns_id); | |
659 | c.common.cdw10[0] = cpu_to_le32(cdw10); | |
660 | ||
661 | return nvme_submit_sync_cmd(ns->queue, &c, data, 16); | |
662 | } | |
663 | ||
664 | static int nvme_pr_register(struct block_device *bdev, u64 old, | |
665 | u64 new, unsigned flags) | |
666 | { | |
667 | u32 cdw10; | |
668 | ||
669 | if (flags & ~PR_FL_IGNORE_KEY) | |
670 | return -EOPNOTSUPP; | |
671 | ||
672 | cdw10 = old ? 2 : 0; | |
673 | cdw10 |= (flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0; | |
674 | cdw10 |= (1 << 30) | (1 << 31); /* PTPL=1 */ | |
675 | return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_register); | |
676 | } | |
677 | ||
678 | static int nvme_pr_reserve(struct block_device *bdev, u64 key, | |
679 | enum pr_type type, unsigned flags) | |
680 | { | |
681 | u32 cdw10; | |
682 | ||
683 | if (flags & ~PR_FL_IGNORE_KEY) | |
684 | return -EOPNOTSUPP; | |
685 | ||
686 | cdw10 = nvme_pr_type(type) << 8; | |
687 | cdw10 |= ((flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0); | |
688 | return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_acquire); | |
689 | } | |
690 | ||
691 | static int nvme_pr_preempt(struct block_device *bdev, u64 old, u64 new, | |
692 | enum pr_type type, bool abort) | |
693 | { | |
694 | u32 cdw10 = nvme_pr_type(type) << 8 | abort ? 2 : 1; | |
695 | return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_acquire); | |
696 | } | |
697 | ||
698 | static int nvme_pr_clear(struct block_device *bdev, u64 key) | |
699 | { | |
8c0b3915 | 700 | u32 cdw10 = 1 | (key ? 1 << 3 : 0); |
1673f1f0 CH |
701 | return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_register); |
702 | } | |
703 | ||
704 | static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type) | |
705 | { | |
706 | u32 cdw10 = nvme_pr_type(type) << 8 | key ? 1 << 3 : 0; | |
707 | return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release); | |
708 | } | |
709 | ||
710 | static const struct pr_ops nvme_pr_ops = { | |
711 | .pr_register = nvme_pr_register, | |
712 | .pr_reserve = nvme_pr_reserve, | |
713 | .pr_release = nvme_pr_release, | |
714 | .pr_preempt = nvme_pr_preempt, | |
715 | .pr_clear = nvme_pr_clear, | |
716 | }; | |
717 | ||
5bae7f73 | 718 | static const struct block_device_operations nvme_fops = { |
1673f1f0 CH |
719 | .owner = THIS_MODULE, |
720 | .ioctl = nvme_ioctl, | |
721 | .compat_ioctl = nvme_compat_ioctl, | |
722 | .open = nvme_open, | |
723 | .release = nvme_release, | |
724 | .getgeo = nvme_getgeo, | |
725 | .revalidate_disk= nvme_revalidate_disk, | |
726 | .pr_ops = &nvme_pr_ops, | |
727 | }; | |
728 | ||
5fd4ce1b CH |
729 | static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled) |
730 | { | |
731 | unsigned long timeout = | |
732 | ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies; | |
733 | u32 csts, bit = enabled ? NVME_CSTS_RDY : 0; | |
734 | int ret; | |
735 | ||
736 | while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) { | |
737 | if ((csts & NVME_CSTS_RDY) == bit) | |
738 | break; | |
739 | ||
740 | msleep(100); | |
741 | if (fatal_signal_pending(current)) | |
742 | return -EINTR; | |
743 | if (time_after(jiffies, timeout)) { | |
744 | dev_err(ctrl->dev, | |
745 | "Device not ready; aborting %s\n", enabled ? | |
746 | "initialisation" : "reset"); | |
747 | return -ENODEV; | |
748 | } | |
749 | } | |
750 | ||
751 | return ret; | |
752 | } | |
753 | ||
754 | /* | |
755 | * If the device has been passed off to us in an enabled state, just clear | |
756 | * the enabled bit. The spec says we should set the 'shutdown notification | |
757 | * bits', but doing so may cause the device to complete commands to the | |
758 | * admin queue ... and we don't know what memory that might be pointing at! | |
759 | */ | |
760 | int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap) | |
761 | { | |
762 | int ret; | |
763 | ||
764 | ctrl->ctrl_config &= ~NVME_CC_SHN_MASK; | |
765 | ctrl->ctrl_config &= ~NVME_CC_ENABLE; | |
766 | ||
767 | ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config); | |
768 | if (ret) | |
769 | return ret; | |
770 | return nvme_wait_ready(ctrl, cap, false); | |
771 | } | |
772 | ||
773 | int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap) | |
774 | { | |
775 | /* | |
776 | * Default to a 4K page size, with the intention to update this | |
777 | * path in the future to accomodate architectures with differing | |
778 | * kernel and IO page sizes. | |
779 | */ | |
780 | unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12, page_shift = 12; | |
781 | int ret; | |
782 | ||
783 | if (page_shift < dev_page_min) { | |
784 | dev_err(ctrl->dev, | |
785 | "Minimum device page size %u too large for host (%u)\n", | |
786 | 1 << dev_page_min, 1 << page_shift); | |
787 | return -ENODEV; | |
788 | } | |
789 | ||
790 | ctrl->page_size = 1 << page_shift; | |
791 | ||
792 | ctrl->ctrl_config = NVME_CC_CSS_NVM; | |
793 | ctrl->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT; | |
794 | ctrl->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE; | |
795 | ctrl->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES; | |
796 | ctrl->ctrl_config |= NVME_CC_ENABLE; | |
797 | ||
798 | ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config); | |
799 | if (ret) | |
800 | return ret; | |
801 | return nvme_wait_ready(ctrl, cap, true); | |
802 | } | |
803 | ||
804 | int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl) | |
805 | { | |
806 | unsigned long timeout = SHUTDOWN_TIMEOUT + jiffies; | |
807 | u32 csts; | |
808 | int ret; | |
809 | ||
810 | ctrl->ctrl_config &= ~NVME_CC_SHN_MASK; | |
811 | ctrl->ctrl_config |= NVME_CC_SHN_NORMAL; | |
812 | ||
813 | ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config); | |
814 | if (ret) | |
815 | return ret; | |
816 | ||
817 | while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) { | |
818 | if ((csts & NVME_CSTS_SHST_MASK) == NVME_CSTS_SHST_CMPLT) | |
819 | break; | |
820 | ||
821 | msleep(100); | |
822 | if (fatal_signal_pending(current)) | |
823 | return -EINTR; | |
824 | if (time_after(jiffies, timeout)) { | |
825 | dev_err(ctrl->dev, | |
826 | "Device shutdown incomplete; abort shutdown\n"); | |
827 | return -ENODEV; | |
828 | } | |
829 | } | |
830 | ||
831 | return ret; | |
832 | } | |
833 | ||
7fd8930f CH |
834 | /* |
835 | * Initialize the cached copies of the Identify data and various controller | |
836 | * register in our nvme_ctrl structure. This should be called as soon as | |
837 | * the admin queue is fully up and running. | |
838 | */ | |
839 | int nvme_init_identify(struct nvme_ctrl *ctrl) | |
840 | { | |
841 | struct nvme_id_ctrl *id; | |
842 | u64 cap; | |
843 | int ret, page_shift; | |
844 | ||
f3ca80fc CH |
845 | ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs); |
846 | if (ret) { | |
847 | dev_err(ctrl->dev, "Reading VS failed (%d)\n", ret); | |
848 | return ret; | |
849 | } | |
850 | ||
7fd8930f CH |
851 | ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap); |
852 | if (ret) { | |
853 | dev_err(ctrl->dev, "Reading CAP failed (%d)\n", ret); | |
854 | return ret; | |
855 | } | |
856 | page_shift = NVME_CAP_MPSMIN(cap) + 12; | |
857 | ||
f3ca80fc CH |
858 | if (ctrl->vs >= NVME_VS(1, 1)) |
859 | ctrl->subsystem = NVME_CAP_NSSRC(cap); | |
860 | ||
7fd8930f CH |
861 | ret = nvme_identify_ctrl(ctrl, &id); |
862 | if (ret) { | |
863 | dev_err(ctrl->dev, "Identify Controller failed (%d)\n", ret); | |
864 | return -EIO; | |
865 | } | |
866 | ||
867 | ctrl->oncs = le16_to_cpup(&id->oncs); | |
6bf25d16 | 868 | atomic_set(&ctrl->abort_limit, id->acl + 1); |
7fd8930f CH |
869 | ctrl->vwc = id->vwc; |
870 | memcpy(ctrl->serial, id->sn, sizeof(id->sn)); | |
871 | memcpy(ctrl->model, id->mn, sizeof(id->mn)); | |
872 | memcpy(ctrl->firmware_rev, id->fr, sizeof(id->fr)); | |
873 | if (id->mdts) | |
874 | ctrl->max_hw_sectors = 1 << (id->mdts + page_shift - 9); | |
875 | else | |
876 | ctrl->max_hw_sectors = UINT_MAX; | |
877 | ||
878 | if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) && id->vs[3]) { | |
879 | unsigned int max_hw_sectors; | |
880 | ||
881 | ctrl->stripe_size = 1 << (id->vs[3] + page_shift); | |
882 | max_hw_sectors = ctrl->stripe_size >> (page_shift - 9); | |
883 | if (ctrl->max_hw_sectors) { | |
884 | ctrl->max_hw_sectors = min(max_hw_sectors, | |
885 | ctrl->max_hw_sectors); | |
886 | } else { | |
887 | ctrl->max_hw_sectors = max_hw_sectors; | |
888 | } | |
889 | } | |
890 | ||
891 | kfree(id); | |
892 | return 0; | |
893 | } | |
894 | ||
f3ca80fc | 895 | static int nvme_dev_open(struct inode *inode, struct file *file) |
1673f1f0 | 896 | { |
f3ca80fc CH |
897 | struct nvme_ctrl *ctrl; |
898 | int instance = iminor(inode); | |
899 | int ret = -ENODEV; | |
1673f1f0 | 900 | |
f3ca80fc CH |
901 | spin_lock(&dev_list_lock); |
902 | list_for_each_entry(ctrl, &nvme_ctrl_list, node) { | |
903 | if (ctrl->instance != instance) | |
904 | continue; | |
905 | ||
906 | if (!ctrl->admin_q) { | |
907 | ret = -EWOULDBLOCK; | |
908 | break; | |
909 | } | |
910 | if (!kref_get_unless_zero(&ctrl->kref)) | |
911 | break; | |
912 | file->private_data = ctrl; | |
913 | ret = 0; | |
914 | break; | |
915 | } | |
916 | spin_unlock(&dev_list_lock); | |
917 | ||
918 | return ret; | |
1673f1f0 CH |
919 | } |
920 | ||
f3ca80fc | 921 | static int nvme_dev_release(struct inode *inode, struct file *file) |
1673f1f0 | 922 | { |
f3ca80fc CH |
923 | nvme_put_ctrl(file->private_data); |
924 | return 0; | |
925 | } | |
926 | ||
bfd89471 CH |
927 | static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp) |
928 | { | |
929 | struct nvme_ns *ns; | |
930 | int ret; | |
931 | ||
932 | mutex_lock(&ctrl->namespaces_mutex); | |
933 | if (list_empty(&ctrl->namespaces)) { | |
934 | ret = -ENOTTY; | |
935 | goto out_unlock; | |
936 | } | |
937 | ||
938 | ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list); | |
939 | if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) { | |
940 | dev_warn(ctrl->dev, | |
941 | "NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n"); | |
942 | ret = -EINVAL; | |
943 | goto out_unlock; | |
944 | } | |
945 | ||
946 | dev_warn(ctrl->dev, | |
947 | "using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n"); | |
948 | kref_get(&ns->kref); | |
949 | mutex_unlock(&ctrl->namespaces_mutex); | |
950 | ||
951 | ret = nvme_user_cmd(ctrl, ns, argp); | |
952 | nvme_put_ns(ns); | |
953 | return ret; | |
954 | ||
955 | out_unlock: | |
956 | mutex_unlock(&ctrl->namespaces_mutex); | |
957 | return ret; | |
958 | } | |
959 | ||
f3ca80fc CH |
960 | static long nvme_dev_ioctl(struct file *file, unsigned int cmd, |
961 | unsigned long arg) | |
962 | { | |
963 | struct nvme_ctrl *ctrl = file->private_data; | |
964 | void __user *argp = (void __user *)arg; | |
f3ca80fc CH |
965 | |
966 | switch (cmd) { | |
967 | case NVME_IOCTL_ADMIN_CMD: | |
968 | return nvme_user_cmd(ctrl, NULL, argp); | |
969 | case NVME_IOCTL_IO_CMD: | |
bfd89471 | 970 | return nvme_dev_user_cmd(ctrl, argp); |
f3ca80fc CH |
971 | case NVME_IOCTL_RESET: |
972 | dev_warn(ctrl->dev, "resetting controller\n"); | |
973 | return ctrl->ops->reset_ctrl(ctrl); | |
974 | case NVME_IOCTL_SUBSYS_RESET: | |
975 | return nvme_reset_subsystem(ctrl); | |
976 | default: | |
977 | return -ENOTTY; | |
978 | } | |
979 | } | |
980 | ||
981 | static const struct file_operations nvme_dev_fops = { | |
982 | .owner = THIS_MODULE, | |
983 | .open = nvme_dev_open, | |
984 | .release = nvme_dev_release, | |
985 | .unlocked_ioctl = nvme_dev_ioctl, | |
986 | .compat_ioctl = nvme_dev_ioctl, | |
987 | }; | |
988 | ||
989 | static ssize_t nvme_sysfs_reset(struct device *dev, | |
990 | struct device_attribute *attr, const char *buf, | |
991 | size_t count) | |
992 | { | |
993 | struct nvme_ctrl *ctrl = dev_get_drvdata(dev); | |
994 | int ret; | |
995 | ||
996 | ret = ctrl->ops->reset_ctrl(ctrl); | |
997 | if (ret < 0) | |
998 | return ret; | |
999 | return count; | |
1673f1f0 | 1000 | } |
f3ca80fc | 1001 | static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset); |
1673f1f0 | 1002 | |
2b9b6e86 KB |
1003 | static ssize_t uuid_show(struct device *dev, struct device_attribute *attr, |
1004 | char *buf) | |
1005 | { | |
1006 | struct nvme_ns *ns = dev_to_disk(dev)->private_data; | |
1007 | return sprintf(buf, "%pU\n", ns->uuid); | |
1008 | } | |
1009 | static DEVICE_ATTR(uuid, S_IRUGO, uuid_show, NULL); | |
1010 | ||
1011 | static ssize_t eui_show(struct device *dev, struct device_attribute *attr, | |
1012 | char *buf) | |
1013 | { | |
1014 | struct nvme_ns *ns = dev_to_disk(dev)->private_data; | |
1015 | return sprintf(buf, "%8phd\n", ns->eui); | |
1016 | } | |
1017 | static DEVICE_ATTR(eui, S_IRUGO, eui_show, NULL); | |
1018 | ||
1019 | static ssize_t nsid_show(struct device *dev, struct device_attribute *attr, | |
1020 | char *buf) | |
1021 | { | |
1022 | struct nvme_ns *ns = dev_to_disk(dev)->private_data; | |
1023 | return sprintf(buf, "%d\n", ns->ns_id); | |
1024 | } | |
1025 | static DEVICE_ATTR(nsid, S_IRUGO, nsid_show, NULL); | |
1026 | ||
1027 | static struct attribute *nvme_ns_attrs[] = { | |
1028 | &dev_attr_uuid.attr, | |
1029 | &dev_attr_eui.attr, | |
1030 | &dev_attr_nsid.attr, | |
1031 | NULL, | |
1032 | }; | |
1033 | ||
1034 | static umode_t nvme_attrs_are_visible(struct kobject *kobj, | |
1035 | struct attribute *a, int n) | |
1036 | { | |
1037 | struct device *dev = container_of(kobj, struct device, kobj); | |
1038 | struct nvme_ns *ns = dev_to_disk(dev)->private_data; | |
1039 | ||
1040 | if (a == &dev_attr_uuid.attr) { | |
1041 | if (!memchr_inv(ns->uuid, 0, sizeof(ns->uuid))) | |
1042 | return 0; | |
1043 | } | |
1044 | if (a == &dev_attr_eui.attr) { | |
1045 | if (!memchr_inv(ns->eui, 0, sizeof(ns->eui))) | |
1046 | return 0; | |
1047 | } | |
1048 | return a->mode; | |
1049 | } | |
1050 | ||
1051 | static const struct attribute_group nvme_ns_attr_group = { | |
1052 | .attrs = nvme_ns_attrs, | |
1053 | .is_visible = nvme_attrs_are_visible, | |
1054 | }; | |
1055 | ||
779ff756 KB |
1056 | #define nvme_show_function(field) \ |
1057 | static ssize_t field##_show(struct device *dev, \ | |
1058 | struct device_attribute *attr, char *buf) \ | |
1059 | { \ | |
1060 | struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \ | |
1061 | return sprintf(buf, "%.*s\n", (int)sizeof(ctrl->field), ctrl->field); \ | |
1062 | } \ | |
1063 | static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL); | |
1064 | ||
1065 | nvme_show_function(model); | |
1066 | nvme_show_function(serial); | |
1067 | nvme_show_function(firmware_rev); | |
1068 | ||
1069 | static struct attribute *nvme_dev_attrs[] = { | |
1070 | &dev_attr_reset_controller.attr, | |
1071 | &dev_attr_model.attr, | |
1072 | &dev_attr_serial.attr, | |
1073 | &dev_attr_firmware_rev.attr, | |
1074 | NULL | |
1075 | }; | |
1076 | ||
1077 | static struct attribute_group nvme_dev_attrs_group = { | |
1078 | .attrs = nvme_dev_attrs, | |
1079 | }; | |
1080 | ||
1081 | static const struct attribute_group *nvme_dev_attr_groups[] = { | |
1082 | &nvme_dev_attrs_group, | |
1083 | NULL, | |
1084 | }; | |
1085 | ||
5bae7f73 CH |
1086 | static int ns_cmp(void *priv, struct list_head *a, struct list_head *b) |
1087 | { | |
1088 | struct nvme_ns *nsa = container_of(a, struct nvme_ns, list); | |
1089 | struct nvme_ns *nsb = container_of(b, struct nvme_ns, list); | |
1090 | ||
1091 | return nsa->ns_id - nsb->ns_id; | |
1092 | } | |
1093 | ||
1094 | static struct nvme_ns *nvme_find_ns(struct nvme_ctrl *ctrl, unsigned nsid) | |
1095 | { | |
1096 | struct nvme_ns *ns; | |
1097 | ||
69d3b8ac CH |
1098 | lockdep_assert_held(&ctrl->namespaces_mutex); |
1099 | ||
5bae7f73 CH |
1100 | list_for_each_entry(ns, &ctrl->namespaces, list) { |
1101 | if (ns->ns_id == nsid) | |
1102 | return ns; | |
1103 | if (ns->ns_id > nsid) | |
1104 | break; | |
1105 | } | |
1106 | return NULL; | |
1107 | } | |
1108 | ||
1109 | static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid) | |
1110 | { | |
1111 | struct nvme_ns *ns; | |
1112 | struct gendisk *disk; | |
1113 | int node = dev_to_node(ctrl->dev); | |
1114 | ||
69d3b8ac CH |
1115 | lockdep_assert_held(&ctrl->namespaces_mutex); |
1116 | ||
5bae7f73 CH |
1117 | ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node); |
1118 | if (!ns) | |
1119 | return; | |
1120 | ||
1121 | ns->queue = blk_mq_init_queue(ctrl->tagset); | |
1122 | if (IS_ERR(ns->queue)) | |
1123 | goto out_free_ns; | |
1124 | queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, ns->queue); | |
1125 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue); | |
1126 | ns->queue->queuedata = ns; | |
1127 | ns->ctrl = ctrl; | |
1128 | ||
1129 | disk = alloc_disk_node(0, node); | |
1130 | if (!disk) | |
1131 | goto out_free_queue; | |
1132 | ||
1133 | kref_init(&ns->kref); | |
1134 | ns->ns_id = nsid; | |
1135 | ns->disk = disk; | |
1136 | ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */ | |
5bae7f73 CH |
1137 | |
1138 | blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift); | |
1139 | if (ctrl->max_hw_sectors) { | |
1140 | blk_queue_max_hw_sectors(ns->queue, ctrl->max_hw_sectors); | |
1141 | blk_queue_max_segments(ns->queue, | |
1142 | (ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1); | |
1143 | } | |
1144 | if (ctrl->stripe_size) | |
1145 | blk_queue_chunk_sectors(ns->queue, ctrl->stripe_size >> 9); | |
1146 | if (ctrl->vwc & NVME_CTRL_VWC_PRESENT) | |
1147 | blk_queue_flush(ns->queue, REQ_FLUSH | REQ_FUA); | |
1148 | blk_queue_virt_boundary(ns->queue, ctrl->page_size - 1); | |
1149 | ||
1150 | disk->major = nvme_major; | |
1151 | disk->first_minor = 0; | |
1152 | disk->fops = &nvme_fops; | |
1153 | disk->private_data = ns; | |
1154 | disk->queue = ns->queue; | |
1155 | disk->driverfs_dev = ctrl->device; | |
1156 | disk->flags = GENHD_FL_EXT_DEVT; | |
1157 | sprintf(disk->disk_name, "nvme%dn%d", ctrl->instance, nsid); | |
1158 | ||
5bae7f73 CH |
1159 | if (nvme_revalidate_disk(ns->disk)) |
1160 | goto out_free_disk; | |
1161 | ||
4b9d5b15 | 1162 | list_add_tail(&ns->list, &ctrl->namespaces); |
5bae7f73 | 1163 | kref_get(&ctrl->kref); |
2b9b6e86 KB |
1164 | if (ns->type == NVME_NS_LIGHTNVM) |
1165 | return; | |
5bae7f73 | 1166 | |
2b9b6e86 KB |
1167 | add_disk(ns->disk); |
1168 | if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj, | |
1169 | &nvme_ns_attr_group)) | |
1170 | pr_warn("%s: failed to create sysfs group for identification\n", | |
1171 | ns->disk->disk_name); | |
5bae7f73 CH |
1172 | return; |
1173 | out_free_disk: | |
1174 | kfree(disk); | |
5bae7f73 CH |
1175 | out_free_queue: |
1176 | blk_cleanup_queue(ns->queue); | |
1177 | out_free_ns: | |
1178 | kfree(ns); | |
1179 | } | |
1180 | ||
1181 | static void nvme_ns_remove(struct nvme_ns *ns) | |
1182 | { | |
1183 | bool kill = nvme_io_incapable(ns->ctrl) && | |
1184 | !blk_queue_dying(ns->queue); | |
1185 | ||
69d3b8ac CH |
1186 | lockdep_assert_held(&ns->ctrl->namespaces_mutex); |
1187 | ||
3e1e21c7 | 1188 | if (kill) { |
5bae7f73 | 1189 | blk_set_queue_dying(ns->queue); |
3e1e21c7 LT |
1190 | |
1191 | /* | |
1192 | * The controller was shutdown first if we got here through | |
1193 | * device removal. The shutdown may requeue outstanding | |
1194 | * requests. These need to be aborted immediately so | |
1195 | * del_gendisk doesn't block indefinitely for their completion. | |
1196 | */ | |
1197 | blk_mq_abort_requeue_list(ns->queue); | |
1198 | } | |
5bae7f73 CH |
1199 | if (ns->disk->flags & GENHD_FL_UP) { |
1200 | if (blk_get_integrity(ns->disk)) | |
1201 | blk_integrity_unregister(ns->disk); | |
2b9b6e86 KB |
1202 | sysfs_remove_group(&disk_to_dev(ns->disk)->kobj, |
1203 | &nvme_ns_attr_group); | |
5bae7f73 CH |
1204 | del_gendisk(ns->disk); |
1205 | } | |
1206 | if (kill || !blk_queue_dying(ns->queue)) { | |
1207 | blk_mq_abort_requeue_list(ns->queue); | |
1208 | blk_cleanup_queue(ns->queue); | |
1209 | } | |
1210 | list_del_init(&ns->list); | |
1211 | nvme_put_ns(ns); | |
1212 | } | |
1213 | ||
540c801c KB |
1214 | static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid) |
1215 | { | |
1216 | struct nvme_ns *ns; | |
1217 | ||
1218 | ns = nvme_find_ns(ctrl, nsid); | |
1219 | if (ns) { | |
1220 | if (revalidate_disk(ns->disk)) | |
1221 | nvme_ns_remove(ns); | |
1222 | } else | |
1223 | nvme_alloc_ns(ctrl, nsid); | |
1224 | } | |
1225 | ||
1226 | static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn) | |
1227 | { | |
1228 | struct nvme_ns *ns; | |
1229 | __le32 *ns_list; | |
1230 | unsigned i, j, nsid, prev = 0, num_lists = DIV_ROUND_UP(nn, 1024); | |
1231 | int ret = 0; | |
1232 | ||
1233 | ns_list = kzalloc(0x1000, GFP_KERNEL); | |
1234 | if (!ns_list) | |
1235 | return -ENOMEM; | |
1236 | ||
1237 | for (i = 0; i < num_lists; i++) { | |
1238 | ret = nvme_identify_ns_list(ctrl, prev, ns_list); | |
1239 | if (ret) | |
1240 | goto out; | |
1241 | ||
1242 | for (j = 0; j < min(nn, 1024U); j++) { | |
1243 | nsid = le32_to_cpu(ns_list[j]); | |
1244 | if (!nsid) | |
1245 | goto out; | |
1246 | ||
1247 | nvme_validate_ns(ctrl, nsid); | |
1248 | ||
1249 | while (++prev < nsid) { | |
1250 | ns = nvme_find_ns(ctrl, prev); | |
1251 | if (ns) | |
1252 | nvme_ns_remove(ns); | |
1253 | } | |
1254 | } | |
1255 | nn -= j; | |
1256 | } | |
1257 | out: | |
1258 | kfree(ns_list); | |
1259 | return ret; | |
1260 | } | |
1261 | ||
5bae7f73 CH |
1262 | static void __nvme_scan_namespaces(struct nvme_ctrl *ctrl, unsigned nn) |
1263 | { | |
1264 | struct nvme_ns *ns, *next; | |
1265 | unsigned i; | |
1266 | ||
69d3b8ac CH |
1267 | lockdep_assert_held(&ctrl->namespaces_mutex); |
1268 | ||
540c801c KB |
1269 | for (i = 1; i <= nn; i++) |
1270 | nvme_validate_ns(ctrl, i); | |
1271 | ||
5bae7f73 CH |
1272 | list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) { |
1273 | if (ns->ns_id > nn) | |
1274 | nvme_ns_remove(ns); | |
1275 | } | |
5bae7f73 CH |
1276 | } |
1277 | ||
1278 | void nvme_scan_namespaces(struct nvme_ctrl *ctrl) | |
1279 | { | |
1280 | struct nvme_id_ctrl *id; | |
540c801c | 1281 | unsigned nn; |
5bae7f73 CH |
1282 | |
1283 | if (nvme_identify_ctrl(ctrl, &id)) | |
1284 | return; | |
540c801c | 1285 | |
69d3b8ac | 1286 | mutex_lock(&ctrl->namespaces_mutex); |
540c801c KB |
1287 | nn = le32_to_cpu(id->nn); |
1288 | if (ctrl->vs >= NVME_VS(1, 1) && | |
1289 | !(ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)) { | |
1290 | if (!nvme_scan_ns_list(ctrl, nn)) | |
1291 | goto done; | |
1292 | } | |
5bae7f73 | 1293 | __nvme_scan_namespaces(ctrl, le32_to_cpup(&id->nn)); |
540c801c KB |
1294 | done: |
1295 | list_sort(NULL, &ctrl->namespaces, ns_cmp); | |
69d3b8ac | 1296 | mutex_unlock(&ctrl->namespaces_mutex); |
5bae7f73 CH |
1297 | kfree(id); |
1298 | } | |
1299 | ||
1300 | void nvme_remove_namespaces(struct nvme_ctrl *ctrl) | |
1301 | { | |
1302 | struct nvme_ns *ns, *next; | |
1303 | ||
69d3b8ac | 1304 | mutex_lock(&ctrl->namespaces_mutex); |
5bae7f73 CH |
1305 | list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) |
1306 | nvme_ns_remove(ns); | |
69d3b8ac | 1307 | mutex_unlock(&ctrl->namespaces_mutex); |
5bae7f73 CH |
1308 | } |
1309 | ||
f3ca80fc CH |
1310 | static DEFINE_IDA(nvme_instance_ida); |
1311 | ||
1312 | static int nvme_set_instance(struct nvme_ctrl *ctrl) | |
1313 | { | |
1314 | int instance, error; | |
1315 | ||
1316 | do { | |
1317 | if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL)) | |
1318 | return -ENODEV; | |
1319 | ||
1320 | spin_lock(&dev_list_lock); | |
1321 | error = ida_get_new(&nvme_instance_ida, &instance); | |
1322 | spin_unlock(&dev_list_lock); | |
1323 | } while (error == -EAGAIN); | |
1324 | ||
1325 | if (error) | |
1326 | return -ENODEV; | |
1327 | ||
1328 | ctrl->instance = instance; | |
1329 | return 0; | |
1330 | } | |
1331 | ||
1332 | static void nvme_release_instance(struct nvme_ctrl *ctrl) | |
1333 | { | |
1334 | spin_lock(&dev_list_lock); | |
1335 | ida_remove(&nvme_instance_ida, ctrl->instance); | |
1336 | spin_unlock(&dev_list_lock); | |
1337 | } | |
1338 | ||
53029b04 KB |
1339 | void nvme_uninit_ctrl(struct nvme_ctrl *ctrl) |
1340 | { | |
53029b04 | 1341 | device_destroy(nvme_class, MKDEV(nvme_char_major, ctrl->instance)); |
f3ca80fc CH |
1342 | |
1343 | spin_lock(&dev_list_lock); | |
1344 | list_del(&ctrl->node); | |
1345 | spin_unlock(&dev_list_lock); | |
53029b04 KB |
1346 | } |
1347 | ||
1348 | static void nvme_free_ctrl(struct kref *kref) | |
1349 | { | |
1350 | struct nvme_ctrl *ctrl = container_of(kref, struct nvme_ctrl, kref); | |
f3ca80fc CH |
1351 | |
1352 | put_device(ctrl->device); | |
1353 | nvme_release_instance(ctrl); | |
f3ca80fc CH |
1354 | |
1355 | ctrl->ops->free_ctrl(ctrl); | |
1356 | } | |
1357 | ||
1358 | void nvme_put_ctrl(struct nvme_ctrl *ctrl) | |
1359 | { | |
1360 | kref_put(&ctrl->kref, nvme_free_ctrl); | |
1361 | } | |
1362 | ||
1363 | /* | |
1364 | * Initialize a NVMe controller structures. This needs to be called during | |
1365 | * earliest initialization so that we have the initialized structured around | |
1366 | * during probing. | |
1367 | */ | |
1368 | int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev, | |
1369 | const struct nvme_ctrl_ops *ops, unsigned long quirks) | |
1370 | { | |
1371 | int ret; | |
1372 | ||
1373 | INIT_LIST_HEAD(&ctrl->namespaces); | |
69d3b8ac | 1374 | mutex_init(&ctrl->namespaces_mutex); |
f3ca80fc CH |
1375 | kref_init(&ctrl->kref); |
1376 | ctrl->dev = dev; | |
1377 | ctrl->ops = ops; | |
1378 | ctrl->quirks = quirks; | |
1379 | ||
1380 | ret = nvme_set_instance(ctrl); | |
1381 | if (ret) | |
1382 | goto out; | |
1383 | ||
779ff756 | 1384 | ctrl->device = device_create_with_groups(nvme_class, ctrl->dev, |
f3ca80fc | 1385 | MKDEV(nvme_char_major, ctrl->instance), |
779ff756 KB |
1386 | dev, nvme_dev_attr_groups, |
1387 | "nvme%d", ctrl->instance); | |
f3ca80fc CH |
1388 | if (IS_ERR(ctrl->device)) { |
1389 | ret = PTR_ERR(ctrl->device); | |
1390 | goto out_release_instance; | |
1391 | } | |
1392 | get_device(ctrl->device); | |
1393 | dev_set_drvdata(ctrl->device, ctrl); | |
1394 | ||
f3ca80fc CH |
1395 | spin_lock(&dev_list_lock); |
1396 | list_add_tail(&ctrl->node, &nvme_ctrl_list); | |
1397 | spin_unlock(&dev_list_lock); | |
1398 | ||
1399 | return 0; | |
f3ca80fc CH |
1400 | out_release_instance: |
1401 | nvme_release_instance(ctrl); | |
1402 | out: | |
1403 | return ret; | |
1404 | } | |
1405 | ||
25646264 | 1406 | void nvme_stop_queues(struct nvme_ctrl *ctrl) |
363c9aac SG |
1407 | { |
1408 | struct nvme_ns *ns; | |
1409 | ||
69d3b8ac | 1410 | mutex_lock(&ctrl->namespaces_mutex); |
363c9aac | 1411 | list_for_each_entry(ns, &ctrl->namespaces, list) { |
363c9aac SG |
1412 | spin_lock_irq(ns->queue->queue_lock); |
1413 | queue_flag_set(QUEUE_FLAG_STOPPED, ns->queue); | |
1414 | spin_unlock_irq(ns->queue->queue_lock); | |
1415 | ||
1416 | blk_mq_cancel_requeue_work(ns->queue); | |
1417 | blk_mq_stop_hw_queues(ns->queue); | |
1418 | } | |
69d3b8ac | 1419 | mutex_unlock(&ctrl->namespaces_mutex); |
363c9aac SG |
1420 | } |
1421 | ||
25646264 | 1422 | void nvme_start_queues(struct nvme_ctrl *ctrl) |
363c9aac SG |
1423 | { |
1424 | struct nvme_ns *ns; | |
1425 | ||
69d3b8ac | 1426 | mutex_lock(&ctrl->namespaces_mutex); |
363c9aac SG |
1427 | list_for_each_entry(ns, &ctrl->namespaces, list) { |
1428 | queue_flag_clear_unlocked(QUEUE_FLAG_STOPPED, ns->queue); | |
363c9aac SG |
1429 | blk_mq_start_stopped_hw_queues(ns->queue, true); |
1430 | blk_mq_kick_requeue_list(ns->queue); | |
1431 | } | |
69d3b8ac | 1432 | mutex_unlock(&ctrl->namespaces_mutex); |
363c9aac SG |
1433 | } |
1434 | ||
5bae7f73 CH |
1435 | int __init nvme_core_init(void) |
1436 | { | |
1437 | int result; | |
1438 | ||
1439 | result = register_blkdev(nvme_major, "nvme"); | |
1440 | if (result < 0) | |
1441 | return result; | |
1442 | else if (result > 0) | |
1443 | nvme_major = result; | |
1444 | ||
f3ca80fc CH |
1445 | result = __register_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme", |
1446 | &nvme_dev_fops); | |
1447 | if (result < 0) | |
1448 | goto unregister_blkdev; | |
1449 | else if (result > 0) | |
1450 | nvme_char_major = result; | |
1451 | ||
1452 | nvme_class = class_create(THIS_MODULE, "nvme"); | |
1453 | if (IS_ERR(nvme_class)) { | |
1454 | result = PTR_ERR(nvme_class); | |
1455 | goto unregister_chrdev; | |
1456 | } | |
1457 | ||
5bae7f73 | 1458 | return 0; |
f3ca80fc CH |
1459 | |
1460 | unregister_chrdev: | |
1461 | __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme"); | |
1462 | unregister_blkdev: | |
1463 | unregister_blkdev(nvme_major, "nvme"); | |
1464 | return result; | |
5bae7f73 CH |
1465 | } |
1466 | ||
1467 | void nvme_core_exit(void) | |
1468 | { | |
1469 | unregister_blkdev(nvme_major, "nvme"); | |
f3ca80fc CH |
1470 | class_destroy(nvme_class); |
1471 | __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme"); | |
5bae7f73 | 1472 | } |