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 | ||
4160982e CH |
81 | struct request *nvme_alloc_request(struct request_queue *q, |
82 | struct nvme_command *cmd, unsigned int flags) | |
21d34711 CH |
83 | { |
84 | bool write = cmd->common.opcode & 1; | |
21d34711 | 85 | struct request *req; |
21d34711 | 86 | |
4160982e | 87 | req = blk_mq_alloc_request(q, write, flags); |
21d34711 | 88 | if (IS_ERR(req)) |
4160982e | 89 | return req; |
21d34711 CH |
90 | |
91 | req->cmd_type = REQ_TYPE_DRV_PRIV; | |
92 | req->cmd_flags |= REQ_FAILFAST_DRIVER; | |
93 | req->__data_len = 0; | |
94 | req->__sector = (sector_t) -1; | |
95 | req->bio = req->biotail = NULL; | |
96 | ||
21d34711 CH |
97 | req->cmd = (unsigned char *)cmd; |
98 | req->cmd_len = sizeof(struct nvme_command); | |
99 | req->special = (void *)0; | |
100 | ||
4160982e CH |
101 | return req; |
102 | } | |
103 | ||
104 | /* | |
105 | * Returns 0 on success. If the result is negative, it's a Linux error code; | |
106 | * if the result is positive, it's an NVM Express status code | |
107 | */ | |
108 | int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, | |
109 | void *buffer, unsigned bufflen, u32 *result, unsigned timeout) | |
110 | { | |
111 | struct request *req; | |
112 | int ret; | |
113 | ||
114 | req = nvme_alloc_request(q, cmd, 0); | |
115 | if (IS_ERR(req)) | |
116 | return PTR_ERR(req); | |
117 | ||
118 | req->timeout = timeout ? timeout : ADMIN_TIMEOUT; | |
119 | ||
21d34711 CH |
120 | if (buffer && bufflen) { |
121 | ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL); | |
122 | if (ret) | |
123 | goto out; | |
4160982e CH |
124 | } |
125 | ||
126 | blk_execute_rq(req->q, NULL, req, 0); | |
127 | if (result) | |
128 | *result = (u32)(uintptr_t)req->special; | |
129 | ret = req->errors; | |
130 | out: | |
131 | blk_mq_free_request(req); | |
132 | return ret; | |
133 | } | |
134 | ||
135 | int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, | |
136 | void *buffer, unsigned bufflen) | |
137 | { | |
138 | return __nvme_submit_sync_cmd(q, cmd, buffer, bufflen, NULL, 0); | |
139 | } | |
140 | ||
0b7f1f26 KB |
141 | int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd, |
142 | void __user *ubuffer, unsigned bufflen, | |
143 | void __user *meta_buffer, unsigned meta_len, u32 meta_seed, | |
144 | u32 *result, unsigned timeout) | |
4160982e | 145 | { |
0b7f1f26 KB |
146 | bool write = cmd->common.opcode & 1; |
147 | struct nvme_ns *ns = q->queuedata; | |
148 | struct gendisk *disk = ns ? ns->disk : NULL; | |
4160982e | 149 | struct request *req; |
0b7f1f26 KB |
150 | struct bio *bio = NULL; |
151 | void *meta = NULL; | |
4160982e CH |
152 | int ret; |
153 | ||
154 | req = nvme_alloc_request(q, cmd, 0); | |
155 | if (IS_ERR(req)) | |
156 | return PTR_ERR(req); | |
157 | ||
158 | req->timeout = timeout ? timeout : ADMIN_TIMEOUT; | |
159 | ||
160 | if (ubuffer && bufflen) { | |
21d34711 CH |
161 | ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen, |
162 | GFP_KERNEL); | |
163 | if (ret) | |
164 | goto out; | |
165 | bio = req->bio; | |
21d34711 | 166 | |
0b7f1f26 KB |
167 | if (!disk) |
168 | goto submit; | |
169 | bio->bi_bdev = bdget_disk(disk, 0); | |
170 | if (!bio->bi_bdev) { | |
171 | ret = -ENODEV; | |
172 | goto out_unmap; | |
173 | } | |
174 | ||
175 | if (meta_buffer) { | |
176 | struct bio_integrity_payload *bip; | |
177 | ||
178 | meta = kmalloc(meta_len, GFP_KERNEL); | |
179 | if (!meta) { | |
180 | ret = -ENOMEM; | |
181 | goto out_unmap; | |
182 | } | |
183 | ||
184 | if (write) { | |
185 | if (copy_from_user(meta, meta_buffer, | |
186 | meta_len)) { | |
187 | ret = -EFAULT; | |
188 | goto out_free_meta; | |
189 | } | |
190 | } | |
191 | ||
192 | bip = bio_integrity_alloc(bio, GFP_KERNEL, 1); | |
193 | if (!bip) { | |
194 | ret = -ENOMEM; | |
195 | goto out_free_meta; | |
196 | } | |
197 | ||
198 | bip->bip_iter.bi_size = meta_len; | |
199 | bip->bip_iter.bi_sector = meta_seed; | |
200 | ||
201 | ret = bio_integrity_add_page(bio, virt_to_page(meta), | |
202 | meta_len, offset_in_page(meta)); | |
203 | if (ret != meta_len) { | |
204 | ret = -ENOMEM; | |
205 | goto out_free_meta; | |
206 | } | |
207 | } | |
208 | } | |
209 | submit: | |
210 | blk_execute_rq(req->q, disk, req, 0); | |
211 | ret = req->errors; | |
21d34711 CH |
212 | if (result) |
213 | *result = (u32)(uintptr_t)req->special; | |
0b7f1f26 KB |
214 | if (meta && !ret && !write) { |
215 | if (copy_to_user(meta_buffer, meta, meta_len)) | |
216 | ret = -EFAULT; | |
217 | } | |
218 | out_free_meta: | |
219 | kfree(meta); | |
220 | out_unmap: | |
221 | if (bio) { | |
222 | if (disk && bio->bi_bdev) | |
223 | bdput(bio->bi_bdev); | |
224 | blk_rq_unmap_user(bio); | |
225 | } | |
21d34711 CH |
226 | out: |
227 | blk_mq_free_request(req); | |
228 | return ret; | |
229 | } | |
230 | ||
0b7f1f26 KB |
231 | int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd, |
232 | void __user *ubuffer, unsigned bufflen, u32 *result, | |
233 | unsigned timeout) | |
234 | { | |
235 | return __nvme_submit_user_cmd(q, cmd, ubuffer, bufflen, NULL, 0, 0, | |
236 | result, timeout); | |
237 | } | |
238 | ||
1c63dc66 | 239 | int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id) |
21d34711 CH |
240 | { |
241 | struct nvme_command c = { }; | |
242 | int error; | |
243 | ||
244 | /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ | |
245 | c.identify.opcode = nvme_admin_identify; | |
246 | c.identify.cns = cpu_to_le32(1); | |
247 | ||
248 | *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL); | |
249 | if (!*id) | |
250 | return -ENOMEM; | |
251 | ||
252 | error = nvme_submit_sync_cmd(dev->admin_q, &c, *id, | |
253 | sizeof(struct nvme_id_ctrl)); | |
254 | if (error) | |
255 | kfree(*id); | |
256 | return error; | |
257 | } | |
258 | ||
1c63dc66 | 259 | int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid, |
21d34711 CH |
260 | struct nvme_id_ns **id) |
261 | { | |
262 | struct nvme_command c = { }; | |
263 | int error; | |
264 | ||
265 | /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ | |
266 | c.identify.opcode = nvme_admin_identify, | |
267 | c.identify.nsid = cpu_to_le32(nsid), | |
268 | ||
269 | *id = kmalloc(sizeof(struct nvme_id_ns), GFP_KERNEL); | |
270 | if (!*id) | |
271 | return -ENOMEM; | |
272 | ||
273 | error = nvme_submit_sync_cmd(dev->admin_q, &c, *id, | |
274 | sizeof(struct nvme_id_ns)); | |
275 | if (error) | |
276 | kfree(*id); | |
277 | return error; | |
278 | } | |
279 | ||
1c63dc66 | 280 | int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid, |
21d34711 CH |
281 | dma_addr_t dma_addr, u32 *result) |
282 | { | |
283 | struct nvme_command c; | |
284 | ||
285 | memset(&c, 0, sizeof(c)); | |
286 | c.features.opcode = nvme_admin_get_features; | |
287 | c.features.nsid = cpu_to_le32(nsid); | |
288 | c.features.prp1 = cpu_to_le64(dma_addr); | |
289 | c.features.fid = cpu_to_le32(fid); | |
290 | ||
4160982e | 291 | return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0, result, 0); |
21d34711 CH |
292 | } |
293 | ||
1c63dc66 | 294 | int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11, |
21d34711 CH |
295 | dma_addr_t dma_addr, u32 *result) |
296 | { | |
297 | struct nvme_command c; | |
298 | ||
299 | memset(&c, 0, sizeof(c)); | |
300 | c.features.opcode = nvme_admin_set_features; | |
301 | c.features.prp1 = cpu_to_le64(dma_addr); | |
302 | c.features.fid = cpu_to_le32(fid); | |
303 | c.features.dword11 = cpu_to_le32(dword11); | |
304 | ||
4160982e | 305 | return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0, result, 0); |
21d34711 CH |
306 | } |
307 | ||
1c63dc66 | 308 | int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log) |
21d34711 CH |
309 | { |
310 | struct nvme_command c = { }; | |
311 | int error; | |
312 | ||
313 | c.common.opcode = nvme_admin_get_log_page, | |
314 | c.common.nsid = cpu_to_le32(0xFFFFFFFF), | |
315 | c.common.cdw10[0] = cpu_to_le32( | |
316 | (((sizeof(struct nvme_smart_log) / 4) - 1) << 16) | | |
317 | NVME_LOG_SMART), | |
318 | ||
319 | *log = kmalloc(sizeof(struct nvme_smart_log), GFP_KERNEL); | |
320 | if (!*log) | |
321 | return -ENOMEM; | |
322 | ||
323 | error = nvme_submit_sync_cmd(dev->admin_q, &c, *log, | |
324 | sizeof(struct nvme_smart_log)); | |
325 | if (error) | |
326 | kfree(*log); | |
327 | return error; | |
328 | } | |
1673f1f0 CH |
329 | |
330 | static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio) | |
331 | { | |
332 | struct nvme_user_io io; | |
333 | struct nvme_command c; | |
334 | unsigned length, meta_len; | |
335 | void __user *metadata; | |
336 | ||
337 | if (copy_from_user(&io, uio, sizeof(io))) | |
338 | return -EFAULT; | |
339 | ||
340 | switch (io.opcode) { | |
341 | case nvme_cmd_write: | |
342 | case nvme_cmd_read: | |
343 | case nvme_cmd_compare: | |
344 | break; | |
345 | default: | |
346 | return -EINVAL; | |
347 | } | |
348 | ||
349 | length = (io.nblocks + 1) << ns->lba_shift; | |
350 | meta_len = (io.nblocks + 1) * ns->ms; | |
351 | metadata = (void __user *)(uintptr_t)io.metadata; | |
352 | ||
353 | if (ns->ext) { | |
354 | length += meta_len; | |
355 | meta_len = 0; | |
356 | } else if (meta_len) { | |
357 | if ((io.metadata & 3) || !io.metadata) | |
358 | return -EINVAL; | |
359 | } | |
360 | ||
361 | memset(&c, 0, sizeof(c)); | |
362 | c.rw.opcode = io.opcode; | |
363 | c.rw.flags = io.flags; | |
364 | c.rw.nsid = cpu_to_le32(ns->ns_id); | |
365 | c.rw.slba = cpu_to_le64(io.slba); | |
366 | c.rw.length = cpu_to_le16(io.nblocks); | |
367 | c.rw.control = cpu_to_le16(io.control); | |
368 | c.rw.dsmgmt = cpu_to_le32(io.dsmgmt); | |
369 | c.rw.reftag = cpu_to_le32(io.reftag); | |
370 | c.rw.apptag = cpu_to_le16(io.apptag); | |
371 | c.rw.appmask = cpu_to_le16(io.appmask); | |
372 | ||
373 | return __nvme_submit_user_cmd(ns->queue, &c, | |
374 | (void __user *)(uintptr_t)io.addr, length, | |
375 | metadata, meta_len, io.slba, NULL, 0); | |
376 | } | |
377 | ||
f3ca80fc | 378 | static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns, |
1673f1f0 CH |
379 | struct nvme_passthru_cmd __user *ucmd) |
380 | { | |
381 | struct nvme_passthru_cmd cmd; | |
382 | struct nvme_command c; | |
383 | unsigned timeout = 0; | |
384 | int status; | |
385 | ||
386 | if (!capable(CAP_SYS_ADMIN)) | |
387 | return -EACCES; | |
388 | if (copy_from_user(&cmd, ucmd, sizeof(cmd))) | |
389 | return -EFAULT; | |
390 | ||
391 | memset(&c, 0, sizeof(c)); | |
392 | c.common.opcode = cmd.opcode; | |
393 | c.common.flags = cmd.flags; | |
394 | c.common.nsid = cpu_to_le32(cmd.nsid); | |
395 | c.common.cdw2[0] = cpu_to_le32(cmd.cdw2); | |
396 | c.common.cdw2[1] = cpu_to_le32(cmd.cdw3); | |
397 | c.common.cdw10[0] = cpu_to_le32(cmd.cdw10); | |
398 | c.common.cdw10[1] = cpu_to_le32(cmd.cdw11); | |
399 | c.common.cdw10[2] = cpu_to_le32(cmd.cdw12); | |
400 | c.common.cdw10[3] = cpu_to_le32(cmd.cdw13); | |
401 | c.common.cdw10[4] = cpu_to_le32(cmd.cdw14); | |
402 | c.common.cdw10[5] = cpu_to_le32(cmd.cdw15); | |
403 | ||
404 | if (cmd.timeout_ms) | |
405 | timeout = msecs_to_jiffies(cmd.timeout_ms); | |
406 | ||
407 | status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c, | |
408 | (void __user *)cmd.addr, cmd.data_len, | |
409 | &cmd.result, timeout); | |
410 | if (status >= 0) { | |
411 | if (put_user(cmd.result, &ucmd->result)) | |
412 | return -EFAULT; | |
413 | } | |
414 | ||
415 | return status; | |
416 | } | |
417 | ||
418 | static int nvme_ioctl(struct block_device *bdev, fmode_t mode, | |
419 | unsigned int cmd, unsigned long arg) | |
420 | { | |
421 | struct nvme_ns *ns = bdev->bd_disk->private_data; | |
422 | ||
423 | switch (cmd) { | |
424 | case NVME_IOCTL_ID: | |
425 | force_successful_syscall_return(); | |
426 | return ns->ns_id; | |
427 | case NVME_IOCTL_ADMIN_CMD: | |
428 | return nvme_user_cmd(ns->ctrl, NULL, (void __user *)arg); | |
429 | case NVME_IOCTL_IO_CMD: | |
430 | return nvme_user_cmd(ns->ctrl, ns, (void __user *)arg); | |
431 | case NVME_IOCTL_SUBMIT_IO: | |
432 | return nvme_submit_io(ns, (void __user *)arg); | |
433 | case SG_GET_VERSION_NUM: | |
434 | return nvme_sg_get_version_num((void __user *)arg); | |
435 | case SG_IO: | |
436 | return nvme_sg_io(ns, (void __user *)arg); | |
437 | default: | |
438 | return -ENOTTY; | |
439 | } | |
440 | } | |
441 | ||
442 | #ifdef CONFIG_COMPAT | |
443 | static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
444 | unsigned int cmd, unsigned long arg) | |
445 | { | |
446 | switch (cmd) { | |
447 | case SG_IO: | |
448 | return -ENOIOCTLCMD; | |
449 | } | |
450 | return nvme_ioctl(bdev, mode, cmd, arg); | |
451 | } | |
452 | #else | |
453 | #define nvme_compat_ioctl NULL | |
454 | #endif | |
455 | ||
456 | static int nvme_open(struct block_device *bdev, fmode_t mode) | |
457 | { | |
458 | return nvme_get_ns_from_disk(bdev->bd_disk) ? 0 : -ENXIO; | |
459 | } | |
460 | ||
461 | static void nvme_release(struct gendisk *disk, fmode_t mode) | |
462 | { | |
463 | nvme_put_ns(disk->private_data); | |
464 | } | |
465 | ||
466 | static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
467 | { | |
468 | /* some standard values */ | |
469 | geo->heads = 1 << 6; | |
470 | geo->sectors = 1 << 5; | |
471 | geo->cylinders = get_capacity(bdev->bd_disk) >> 11; | |
472 | return 0; | |
473 | } | |
474 | ||
475 | #ifdef CONFIG_BLK_DEV_INTEGRITY | |
476 | static void nvme_init_integrity(struct nvme_ns *ns) | |
477 | { | |
478 | struct blk_integrity integrity; | |
479 | ||
480 | switch (ns->pi_type) { | |
481 | case NVME_NS_DPS_PI_TYPE3: | |
482 | integrity.profile = &t10_pi_type3_crc; | |
483 | break; | |
484 | case NVME_NS_DPS_PI_TYPE1: | |
485 | case NVME_NS_DPS_PI_TYPE2: | |
486 | integrity.profile = &t10_pi_type1_crc; | |
487 | break; | |
488 | default: | |
489 | integrity.profile = NULL; | |
490 | break; | |
491 | } | |
492 | integrity.tuple_size = ns->ms; | |
493 | blk_integrity_register(ns->disk, &integrity); | |
494 | blk_queue_max_integrity_segments(ns->queue, 1); | |
495 | } | |
496 | #else | |
497 | static void nvme_init_integrity(struct nvme_ns *ns) | |
498 | { | |
499 | } | |
500 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
501 | ||
502 | static void nvme_config_discard(struct nvme_ns *ns) | |
503 | { | |
504 | u32 logical_block_size = queue_logical_block_size(ns->queue); | |
505 | ns->queue->limits.discard_zeroes_data = 0; | |
506 | ns->queue->limits.discard_alignment = logical_block_size; | |
507 | ns->queue->limits.discard_granularity = logical_block_size; | |
508 | blk_queue_max_discard_sectors(ns->queue, 0xffffffff); | |
509 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue); | |
510 | } | |
511 | ||
5bae7f73 | 512 | static int nvme_revalidate_disk(struct gendisk *disk) |
1673f1f0 CH |
513 | { |
514 | struct nvme_ns *ns = disk->private_data; | |
515 | struct nvme_id_ns *id; | |
516 | u8 lbaf, pi_type; | |
517 | u16 old_ms; | |
518 | unsigned short bs; | |
519 | ||
520 | if (nvme_identify_ns(ns->ctrl, ns->ns_id, &id)) { | |
521 | dev_warn(ns->ctrl->dev, "%s: Identify failure nvme%dn%d\n", | |
522 | __func__, ns->ctrl->instance, ns->ns_id); | |
523 | return -ENODEV; | |
524 | } | |
525 | if (id->ncap == 0) { | |
526 | kfree(id); | |
527 | return -ENODEV; | |
528 | } | |
529 | ||
530 | if (nvme_nvm_ns_supported(ns, id) && ns->type != NVME_NS_LIGHTNVM) { | |
531 | if (nvme_nvm_register(ns->queue, disk->disk_name)) { | |
532 | dev_warn(ns->ctrl->dev, | |
533 | "%s: LightNVM init failure\n", __func__); | |
534 | kfree(id); | |
535 | return -ENODEV; | |
536 | } | |
537 | ns->type = NVME_NS_LIGHTNVM; | |
538 | } | |
539 | ||
540 | old_ms = ns->ms; | |
541 | lbaf = id->flbas & NVME_NS_FLBAS_LBA_MASK; | |
542 | ns->lba_shift = id->lbaf[lbaf].ds; | |
543 | ns->ms = le16_to_cpu(id->lbaf[lbaf].ms); | |
544 | ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT); | |
545 | ||
546 | /* | |
547 | * If identify namespace failed, use default 512 byte block size so | |
548 | * block layer can use before failing read/write for 0 capacity. | |
549 | */ | |
550 | if (ns->lba_shift == 0) | |
551 | ns->lba_shift = 9; | |
552 | bs = 1 << ns->lba_shift; | |
553 | ||
554 | /* XXX: PI implementation requires metadata equal t10 pi tuple size */ | |
555 | pi_type = ns->ms == sizeof(struct t10_pi_tuple) ? | |
556 | id->dps & NVME_NS_DPS_PI_MASK : 0; | |
557 | ||
558 | blk_mq_freeze_queue(disk->queue); | |
559 | if (blk_get_integrity(disk) && (ns->pi_type != pi_type || | |
560 | ns->ms != old_ms || | |
561 | bs != queue_logical_block_size(disk->queue) || | |
562 | (ns->ms && ns->ext))) | |
563 | blk_integrity_unregister(disk); | |
564 | ||
565 | ns->pi_type = pi_type; | |
566 | blk_queue_logical_block_size(ns->queue, bs); | |
567 | ||
568 | if (ns->ms && !ns->ext) | |
569 | nvme_init_integrity(ns); | |
570 | ||
571 | if (ns->ms && !(ns->ms == 8 && ns->pi_type) && !blk_get_integrity(disk)) | |
572 | set_capacity(disk, 0); | |
573 | else | |
574 | set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9)); | |
575 | ||
576 | if (ns->ctrl->oncs & NVME_CTRL_ONCS_DSM) | |
577 | nvme_config_discard(ns); | |
578 | blk_mq_unfreeze_queue(disk->queue); | |
579 | ||
580 | kfree(id); | |
581 | return 0; | |
582 | } | |
583 | ||
584 | static char nvme_pr_type(enum pr_type type) | |
585 | { | |
586 | switch (type) { | |
587 | case PR_WRITE_EXCLUSIVE: | |
588 | return 1; | |
589 | case PR_EXCLUSIVE_ACCESS: | |
590 | return 2; | |
591 | case PR_WRITE_EXCLUSIVE_REG_ONLY: | |
592 | return 3; | |
593 | case PR_EXCLUSIVE_ACCESS_REG_ONLY: | |
594 | return 4; | |
595 | case PR_WRITE_EXCLUSIVE_ALL_REGS: | |
596 | return 5; | |
597 | case PR_EXCLUSIVE_ACCESS_ALL_REGS: | |
598 | return 6; | |
599 | default: | |
600 | return 0; | |
601 | } | |
602 | }; | |
603 | ||
604 | static int nvme_pr_command(struct block_device *bdev, u32 cdw10, | |
605 | u64 key, u64 sa_key, u8 op) | |
606 | { | |
607 | struct nvme_ns *ns = bdev->bd_disk->private_data; | |
608 | struct nvme_command c; | |
609 | u8 data[16] = { 0, }; | |
610 | ||
611 | put_unaligned_le64(key, &data[0]); | |
612 | put_unaligned_le64(sa_key, &data[8]); | |
613 | ||
614 | memset(&c, 0, sizeof(c)); | |
615 | c.common.opcode = op; | |
616 | c.common.nsid = cpu_to_le32(ns->ns_id); | |
617 | c.common.cdw10[0] = cpu_to_le32(cdw10); | |
618 | ||
619 | return nvme_submit_sync_cmd(ns->queue, &c, data, 16); | |
620 | } | |
621 | ||
622 | static int nvme_pr_register(struct block_device *bdev, u64 old, | |
623 | u64 new, unsigned flags) | |
624 | { | |
625 | u32 cdw10; | |
626 | ||
627 | if (flags & ~PR_FL_IGNORE_KEY) | |
628 | return -EOPNOTSUPP; | |
629 | ||
630 | cdw10 = old ? 2 : 0; | |
631 | cdw10 |= (flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0; | |
632 | cdw10 |= (1 << 30) | (1 << 31); /* PTPL=1 */ | |
633 | return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_register); | |
634 | } | |
635 | ||
636 | static int nvme_pr_reserve(struct block_device *bdev, u64 key, | |
637 | enum pr_type type, unsigned flags) | |
638 | { | |
639 | u32 cdw10; | |
640 | ||
641 | if (flags & ~PR_FL_IGNORE_KEY) | |
642 | return -EOPNOTSUPP; | |
643 | ||
644 | cdw10 = nvme_pr_type(type) << 8; | |
645 | cdw10 |= ((flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0); | |
646 | return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_acquire); | |
647 | } | |
648 | ||
649 | static int nvme_pr_preempt(struct block_device *bdev, u64 old, u64 new, | |
650 | enum pr_type type, bool abort) | |
651 | { | |
652 | u32 cdw10 = nvme_pr_type(type) << 8 | abort ? 2 : 1; | |
653 | return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_acquire); | |
654 | } | |
655 | ||
656 | static int nvme_pr_clear(struct block_device *bdev, u64 key) | |
657 | { | |
658 | u32 cdw10 = 1 | key ? 1 << 3 : 0; | |
659 | return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_register); | |
660 | } | |
661 | ||
662 | static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type) | |
663 | { | |
664 | u32 cdw10 = nvme_pr_type(type) << 8 | key ? 1 << 3 : 0; | |
665 | return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release); | |
666 | } | |
667 | ||
668 | static const struct pr_ops nvme_pr_ops = { | |
669 | .pr_register = nvme_pr_register, | |
670 | .pr_reserve = nvme_pr_reserve, | |
671 | .pr_release = nvme_pr_release, | |
672 | .pr_preempt = nvme_pr_preempt, | |
673 | .pr_clear = nvme_pr_clear, | |
674 | }; | |
675 | ||
5bae7f73 | 676 | static const struct block_device_operations nvme_fops = { |
1673f1f0 CH |
677 | .owner = THIS_MODULE, |
678 | .ioctl = nvme_ioctl, | |
679 | .compat_ioctl = nvme_compat_ioctl, | |
680 | .open = nvme_open, | |
681 | .release = nvme_release, | |
682 | .getgeo = nvme_getgeo, | |
683 | .revalidate_disk= nvme_revalidate_disk, | |
684 | .pr_ops = &nvme_pr_ops, | |
685 | }; | |
686 | ||
5fd4ce1b CH |
687 | static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled) |
688 | { | |
689 | unsigned long timeout = | |
690 | ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies; | |
691 | u32 csts, bit = enabled ? NVME_CSTS_RDY : 0; | |
692 | int ret; | |
693 | ||
694 | while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) { | |
695 | if ((csts & NVME_CSTS_RDY) == bit) | |
696 | break; | |
697 | ||
698 | msleep(100); | |
699 | if (fatal_signal_pending(current)) | |
700 | return -EINTR; | |
701 | if (time_after(jiffies, timeout)) { | |
702 | dev_err(ctrl->dev, | |
703 | "Device not ready; aborting %s\n", enabled ? | |
704 | "initialisation" : "reset"); | |
705 | return -ENODEV; | |
706 | } | |
707 | } | |
708 | ||
709 | return ret; | |
710 | } | |
711 | ||
712 | /* | |
713 | * If the device has been passed off to us in an enabled state, just clear | |
714 | * the enabled bit. The spec says we should set the 'shutdown notification | |
715 | * bits', but doing so may cause the device to complete commands to the | |
716 | * admin queue ... and we don't know what memory that might be pointing at! | |
717 | */ | |
718 | int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap) | |
719 | { | |
720 | int ret; | |
721 | ||
722 | ctrl->ctrl_config &= ~NVME_CC_SHN_MASK; | |
723 | ctrl->ctrl_config &= ~NVME_CC_ENABLE; | |
724 | ||
725 | ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config); | |
726 | if (ret) | |
727 | return ret; | |
728 | return nvme_wait_ready(ctrl, cap, false); | |
729 | } | |
730 | ||
731 | int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap) | |
732 | { | |
733 | /* | |
734 | * Default to a 4K page size, with the intention to update this | |
735 | * path in the future to accomodate architectures with differing | |
736 | * kernel and IO page sizes. | |
737 | */ | |
738 | unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12, page_shift = 12; | |
739 | int ret; | |
740 | ||
741 | if (page_shift < dev_page_min) { | |
742 | dev_err(ctrl->dev, | |
743 | "Minimum device page size %u too large for host (%u)\n", | |
744 | 1 << dev_page_min, 1 << page_shift); | |
745 | return -ENODEV; | |
746 | } | |
747 | ||
748 | ctrl->page_size = 1 << page_shift; | |
749 | ||
750 | ctrl->ctrl_config = NVME_CC_CSS_NVM; | |
751 | ctrl->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT; | |
752 | ctrl->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE; | |
753 | ctrl->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES; | |
754 | ctrl->ctrl_config |= NVME_CC_ENABLE; | |
755 | ||
756 | ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config); | |
757 | if (ret) | |
758 | return ret; | |
759 | return nvme_wait_ready(ctrl, cap, true); | |
760 | } | |
761 | ||
762 | int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl) | |
763 | { | |
764 | unsigned long timeout = SHUTDOWN_TIMEOUT + jiffies; | |
765 | u32 csts; | |
766 | int ret; | |
767 | ||
768 | ctrl->ctrl_config &= ~NVME_CC_SHN_MASK; | |
769 | ctrl->ctrl_config |= NVME_CC_SHN_NORMAL; | |
770 | ||
771 | ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config); | |
772 | if (ret) | |
773 | return ret; | |
774 | ||
775 | while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) { | |
776 | if ((csts & NVME_CSTS_SHST_MASK) == NVME_CSTS_SHST_CMPLT) | |
777 | break; | |
778 | ||
779 | msleep(100); | |
780 | if (fatal_signal_pending(current)) | |
781 | return -EINTR; | |
782 | if (time_after(jiffies, timeout)) { | |
783 | dev_err(ctrl->dev, | |
784 | "Device shutdown incomplete; abort shutdown\n"); | |
785 | return -ENODEV; | |
786 | } | |
787 | } | |
788 | ||
789 | return ret; | |
790 | } | |
791 | ||
7fd8930f CH |
792 | /* |
793 | * Initialize the cached copies of the Identify data and various controller | |
794 | * register in our nvme_ctrl structure. This should be called as soon as | |
795 | * the admin queue is fully up and running. | |
796 | */ | |
797 | int nvme_init_identify(struct nvme_ctrl *ctrl) | |
798 | { | |
799 | struct nvme_id_ctrl *id; | |
800 | u64 cap; | |
801 | int ret, page_shift; | |
802 | ||
f3ca80fc CH |
803 | ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs); |
804 | if (ret) { | |
805 | dev_err(ctrl->dev, "Reading VS failed (%d)\n", ret); | |
806 | return ret; | |
807 | } | |
808 | ||
7fd8930f CH |
809 | ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap); |
810 | if (ret) { | |
811 | dev_err(ctrl->dev, "Reading CAP failed (%d)\n", ret); | |
812 | return ret; | |
813 | } | |
814 | page_shift = NVME_CAP_MPSMIN(cap) + 12; | |
815 | ||
f3ca80fc CH |
816 | if (ctrl->vs >= NVME_VS(1, 1)) |
817 | ctrl->subsystem = NVME_CAP_NSSRC(cap); | |
818 | ||
7fd8930f CH |
819 | ret = nvme_identify_ctrl(ctrl, &id); |
820 | if (ret) { | |
821 | dev_err(ctrl->dev, "Identify Controller failed (%d)\n", ret); | |
822 | return -EIO; | |
823 | } | |
824 | ||
825 | ctrl->oncs = le16_to_cpup(&id->oncs); | |
826 | ctrl->abort_limit = id->acl + 1; | |
827 | ctrl->vwc = id->vwc; | |
828 | memcpy(ctrl->serial, id->sn, sizeof(id->sn)); | |
829 | memcpy(ctrl->model, id->mn, sizeof(id->mn)); | |
830 | memcpy(ctrl->firmware_rev, id->fr, sizeof(id->fr)); | |
831 | if (id->mdts) | |
832 | ctrl->max_hw_sectors = 1 << (id->mdts + page_shift - 9); | |
833 | else | |
834 | ctrl->max_hw_sectors = UINT_MAX; | |
835 | ||
836 | if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) && id->vs[3]) { | |
837 | unsigned int max_hw_sectors; | |
838 | ||
839 | ctrl->stripe_size = 1 << (id->vs[3] + page_shift); | |
840 | max_hw_sectors = ctrl->stripe_size >> (page_shift - 9); | |
841 | if (ctrl->max_hw_sectors) { | |
842 | ctrl->max_hw_sectors = min(max_hw_sectors, | |
843 | ctrl->max_hw_sectors); | |
844 | } else { | |
845 | ctrl->max_hw_sectors = max_hw_sectors; | |
846 | } | |
847 | } | |
848 | ||
849 | kfree(id); | |
850 | return 0; | |
851 | } | |
852 | ||
f3ca80fc | 853 | static int nvme_dev_open(struct inode *inode, struct file *file) |
1673f1f0 | 854 | { |
f3ca80fc CH |
855 | struct nvme_ctrl *ctrl; |
856 | int instance = iminor(inode); | |
857 | int ret = -ENODEV; | |
1673f1f0 | 858 | |
f3ca80fc CH |
859 | spin_lock(&dev_list_lock); |
860 | list_for_each_entry(ctrl, &nvme_ctrl_list, node) { | |
861 | if (ctrl->instance != instance) | |
862 | continue; | |
863 | ||
864 | if (!ctrl->admin_q) { | |
865 | ret = -EWOULDBLOCK; | |
866 | break; | |
867 | } | |
868 | if (!kref_get_unless_zero(&ctrl->kref)) | |
869 | break; | |
870 | file->private_data = ctrl; | |
871 | ret = 0; | |
872 | break; | |
873 | } | |
874 | spin_unlock(&dev_list_lock); | |
875 | ||
876 | return ret; | |
1673f1f0 CH |
877 | } |
878 | ||
f3ca80fc | 879 | static int nvme_dev_release(struct inode *inode, struct file *file) |
1673f1f0 | 880 | { |
f3ca80fc CH |
881 | nvme_put_ctrl(file->private_data); |
882 | return 0; | |
883 | } | |
884 | ||
885 | static long nvme_dev_ioctl(struct file *file, unsigned int cmd, | |
886 | unsigned long arg) | |
887 | { | |
888 | struct nvme_ctrl *ctrl = file->private_data; | |
889 | void __user *argp = (void __user *)arg; | |
890 | struct nvme_ns *ns; | |
891 | ||
892 | switch (cmd) { | |
893 | case NVME_IOCTL_ADMIN_CMD: | |
894 | return nvme_user_cmd(ctrl, NULL, argp); | |
895 | case NVME_IOCTL_IO_CMD: | |
896 | if (list_empty(&ctrl->namespaces)) | |
897 | return -ENOTTY; | |
898 | ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list); | |
899 | return nvme_user_cmd(ctrl, ns, argp); | |
900 | case NVME_IOCTL_RESET: | |
901 | dev_warn(ctrl->dev, "resetting controller\n"); | |
902 | return ctrl->ops->reset_ctrl(ctrl); | |
903 | case NVME_IOCTL_SUBSYS_RESET: | |
904 | return nvme_reset_subsystem(ctrl); | |
905 | default: | |
906 | return -ENOTTY; | |
907 | } | |
908 | } | |
909 | ||
910 | static const struct file_operations nvme_dev_fops = { | |
911 | .owner = THIS_MODULE, | |
912 | .open = nvme_dev_open, | |
913 | .release = nvme_dev_release, | |
914 | .unlocked_ioctl = nvme_dev_ioctl, | |
915 | .compat_ioctl = nvme_dev_ioctl, | |
916 | }; | |
917 | ||
918 | static ssize_t nvme_sysfs_reset(struct device *dev, | |
919 | struct device_attribute *attr, const char *buf, | |
920 | size_t count) | |
921 | { | |
922 | struct nvme_ctrl *ctrl = dev_get_drvdata(dev); | |
923 | int ret; | |
924 | ||
925 | ret = ctrl->ops->reset_ctrl(ctrl); | |
926 | if (ret < 0) | |
927 | return ret; | |
928 | return count; | |
1673f1f0 | 929 | } |
f3ca80fc | 930 | static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset); |
1673f1f0 | 931 | |
5bae7f73 CH |
932 | static int ns_cmp(void *priv, struct list_head *a, struct list_head *b) |
933 | { | |
934 | struct nvme_ns *nsa = container_of(a, struct nvme_ns, list); | |
935 | struct nvme_ns *nsb = container_of(b, struct nvme_ns, list); | |
936 | ||
937 | return nsa->ns_id - nsb->ns_id; | |
938 | } | |
939 | ||
940 | static struct nvme_ns *nvme_find_ns(struct nvme_ctrl *ctrl, unsigned nsid) | |
941 | { | |
942 | struct nvme_ns *ns; | |
943 | ||
944 | list_for_each_entry(ns, &ctrl->namespaces, list) { | |
945 | if (ns->ns_id == nsid) | |
946 | return ns; | |
947 | if (ns->ns_id > nsid) | |
948 | break; | |
949 | } | |
950 | return NULL; | |
951 | } | |
952 | ||
953 | static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid) | |
954 | { | |
955 | struct nvme_ns *ns; | |
956 | struct gendisk *disk; | |
957 | int node = dev_to_node(ctrl->dev); | |
958 | ||
959 | ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node); | |
960 | if (!ns) | |
961 | return; | |
962 | ||
963 | ns->queue = blk_mq_init_queue(ctrl->tagset); | |
964 | if (IS_ERR(ns->queue)) | |
965 | goto out_free_ns; | |
966 | queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, ns->queue); | |
967 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue); | |
968 | ns->queue->queuedata = ns; | |
969 | ns->ctrl = ctrl; | |
970 | ||
971 | disk = alloc_disk_node(0, node); | |
972 | if (!disk) | |
973 | goto out_free_queue; | |
974 | ||
975 | kref_init(&ns->kref); | |
976 | ns->ns_id = nsid; | |
977 | ns->disk = disk; | |
978 | ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */ | |
979 | list_add_tail(&ns->list, &ctrl->namespaces); | |
980 | ||
981 | blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift); | |
982 | if (ctrl->max_hw_sectors) { | |
983 | blk_queue_max_hw_sectors(ns->queue, ctrl->max_hw_sectors); | |
984 | blk_queue_max_segments(ns->queue, | |
985 | (ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1); | |
986 | } | |
987 | if (ctrl->stripe_size) | |
988 | blk_queue_chunk_sectors(ns->queue, ctrl->stripe_size >> 9); | |
989 | if (ctrl->vwc & NVME_CTRL_VWC_PRESENT) | |
990 | blk_queue_flush(ns->queue, REQ_FLUSH | REQ_FUA); | |
991 | blk_queue_virt_boundary(ns->queue, ctrl->page_size - 1); | |
992 | ||
993 | disk->major = nvme_major; | |
994 | disk->first_minor = 0; | |
995 | disk->fops = &nvme_fops; | |
996 | disk->private_data = ns; | |
997 | disk->queue = ns->queue; | |
998 | disk->driverfs_dev = ctrl->device; | |
999 | disk->flags = GENHD_FL_EXT_DEVT; | |
1000 | sprintf(disk->disk_name, "nvme%dn%d", ctrl->instance, nsid); | |
1001 | ||
1002 | /* | |
1003 | * Initialize capacity to 0 until we establish the namespace format and | |
1004 | * setup integrity extentions if necessary. The revalidate_disk after | |
1005 | * add_disk allows the driver to register with integrity if the format | |
1006 | * requires it. | |
1007 | */ | |
1008 | set_capacity(disk, 0); | |
1009 | if (nvme_revalidate_disk(ns->disk)) | |
1010 | goto out_free_disk; | |
1011 | ||
1012 | kref_get(&ctrl->kref); | |
1013 | if (ns->type != NVME_NS_LIGHTNVM) { | |
1014 | add_disk(ns->disk); | |
1015 | if (ns->ms) { | |
1016 | struct block_device *bd = bdget_disk(ns->disk, 0); | |
1017 | if (!bd) | |
1018 | return; | |
1019 | if (blkdev_get(bd, FMODE_READ, NULL)) { | |
1020 | bdput(bd); | |
1021 | return; | |
1022 | } | |
1023 | blkdev_reread_part(bd); | |
1024 | blkdev_put(bd, FMODE_READ); | |
1025 | } | |
1026 | } | |
1027 | ||
1028 | return; | |
1029 | out_free_disk: | |
1030 | kfree(disk); | |
1031 | list_del(&ns->list); | |
1032 | out_free_queue: | |
1033 | blk_cleanup_queue(ns->queue); | |
1034 | out_free_ns: | |
1035 | kfree(ns); | |
1036 | } | |
1037 | ||
1038 | static void nvme_ns_remove(struct nvme_ns *ns) | |
1039 | { | |
1040 | bool kill = nvme_io_incapable(ns->ctrl) && | |
1041 | !blk_queue_dying(ns->queue); | |
1042 | ||
1043 | if (kill) | |
1044 | blk_set_queue_dying(ns->queue); | |
1045 | if (ns->disk->flags & GENHD_FL_UP) { | |
1046 | if (blk_get_integrity(ns->disk)) | |
1047 | blk_integrity_unregister(ns->disk); | |
1048 | del_gendisk(ns->disk); | |
1049 | } | |
1050 | if (kill || !blk_queue_dying(ns->queue)) { | |
1051 | blk_mq_abort_requeue_list(ns->queue); | |
1052 | blk_cleanup_queue(ns->queue); | |
1053 | } | |
1054 | list_del_init(&ns->list); | |
1055 | nvme_put_ns(ns); | |
1056 | } | |
1057 | ||
1058 | static void __nvme_scan_namespaces(struct nvme_ctrl *ctrl, unsigned nn) | |
1059 | { | |
1060 | struct nvme_ns *ns, *next; | |
1061 | unsigned i; | |
1062 | ||
1063 | for (i = 1; i <= nn; i++) { | |
1064 | ns = nvme_find_ns(ctrl, i); | |
1065 | if (ns) { | |
1066 | if (revalidate_disk(ns->disk)) | |
1067 | nvme_ns_remove(ns); | |
1068 | } else | |
1069 | nvme_alloc_ns(ctrl, i); | |
1070 | } | |
1071 | list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) { | |
1072 | if (ns->ns_id > nn) | |
1073 | nvme_ns_remove(ns); | |
1074 | } | |
1075 | list_sort(NULL, &ctrl->namespaces, ns_cmp); | |
1076 | } | |
1077 | ||
1078 | void nvme_scan_namespaces(struct nvme_ctrl *ctrl) | |
1079 | { | |
1080 | struct nvme_id_ctrl *id; | |
1081 | ||
1082 | if (nvme_identify_ctrl(ctrl, &id)) | |
1083 | return; | |
1084 | __nvme_scan_namespaces(ctrl, le32_to_cpup(&id->nn)); | |
1085 | kfree(id); | |
1086 | } | |
1087 | ||
1088 | void nvme_remove_namespaces(struct nvme_ctrl *ctrl) | |
1089 | { | |
1090 | struct nvme_ns *ns, *next; | |
1091 | ||
1092 | list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) | |
1093 | nvme_ns_remove(ns); | |
1094 | } | |
1095 | ||
f3ca80fc CH |
1096 | static DEFINE_IDA(nvme_instance_ida); |
1097 | ||
1098 | static int nvme_set_instance(struct nvme_ctrl *ctrl) | |
1099 | { | |
1100 | int instance, error; | |
1101 | ||
1102 | do { | |
1103 | if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL)) | |
1104 | return -ENODEV; | |
1105 | ||
1106 | spin_lock(&dev_list_lock); | |
1107 | error = ida_get_new(&nvme_instance_ida, &instance); | |
1108 | spin_unlock(&dev_list_lock); | |
1109 | } while (error == -EAGAIN); | |
1110 | ||
1111 | if (error) | |
1112 | return -ENODEV; | |
1113 | ||
1114 | ctrl->instance = instance; | |
1115 | return 0; | |
1116 | } | |
1117 | ||
1118 | static void nvme_release_instance(struct nvme_ctrl *ctrl) | |
1119 | { | |
1120 | spin_lock(&dev_list_lock); | |
1121 | ida_remove(&nvme_instance_ida, ctrl->instance); | |
1122 | spin_unlock(&dev_list_lock); | |
1123 | } | |
1124 | ||
1125 | static void nvme_free_ctrl(struct kref *kref) | |
1126 | { | |
1127 | struct nvme_ctrl *ctrl = container_of(kref, struct nvme_ctrl, kref); | |
1128 | ||
1129 | spin_lock(&dev_list_lock); | |
1130 | list_del(&ctrl->node); | |
1131 | spin_unlock(&dev_list_lock); | |
1132 | ||
1133 | put_device(ctrl->device); | |
1134 | nvme_release_instance(ctrl); | |
1135 | device_destroy(nvme_class, MKDEV(nvme_char_major, ctrl->instance)); | |
1136 | ||
1137 | ctrl->ops->free_ctrl(ctrl); | |
1138 | } | |
1139 | ||
1140 | void nvme_put_ctrl(struct nvme_ctrl *ctrl) | |
1141 | { | |
1142 | kref_put(&ctrl->kref, nvme_free_ctrl); | |
1143 | } | |
1144 | ||
1145 | /* | |
1146 | * Initialize a NVMe controller structures. This needs to be called during | |
1147 | * earliest initialization so that we have the initialized structured around | |
1148 | * during probing. | |
1149 | */ | |
1150 | int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev, | |
1151 | const struct nvme_ctrl_ops *ops, unsigned long quirks) | |
1152 | { | |
1153 | int ret; | |
1154 | ||
1155 | INIT_LIST_HEAD(&ctrl->namespaces); | |
1156 | kref_init(&ctrl->kref); | |
1157 | ctrl->dev = dev; | |
1158 | ctrl->ops = ops; | |
1159 | ctrl->quirks = quirks; | |
1160 | ||
1161 | ret = nvme_set_instance(ctrl); | |
1162 | if (ret) | |
1163 | goto out; | |
1164 | ||
1165 | ctrl->device = device_create(nvme_class, ctrl->dev, | |
1166 | MKDEV(nvme_char_major, ctrl->instance), | |
1167 | dev, "nvme%d", ctrl->instance); | |
1168 | if (IS_ERR(ctrl->device)) { | |
1169 | ret = PTR_ERR(ctrl->device); | |
1170 | goto out_release_instance; | |
1171 | } | |
1172 | get_device(ctrl->device); | |
1173 | dev_set_drvdata(ctrl->device, ctrl); | |
1174 | ||
1175 | ret = device_create_file(ctrl->device, &dev_attr_reset_controller); | |
1176 | if (ret) | |
1177 | goto out_put_device; | |
1178 | ||
1179 | spin_lock(&dev_list_lock); | |
1180 | list_add_tail(&ctrl->node, &nvme_ctrl_list); | |
1181 | spin_unlock(&dev_list_lock); | |
1182 | ||
1183 | return 0; | |
1184 | ||
1185 | out_put_device: | |
1186 | put_device(ctrl->device); | |
1187 | device_destroy(nvme_class, MKDEV(nvme_char_major, ctrl->instance)); | |
1188 | out_release_instance: | |
1189 | nvme_release_instance(ctrl); | |
1190 | out: | |
1191 | return ret; | |
1192 | } | |
1193 | ||
5bae7f73 CH |
1194 | int __init nvme_core_init(void) |
1195 | { | |
1196 | int result; | |
1197 | ||
1198 | result = register_blkdev(nvme_major, "nvme"); | |
1199 | if (result < 0) | |
1200 | return result; | |
1201 | else if (result > 0) | |
1202 | nvme_major = result; | |
1203 | ||
f3ca80fc CH |
1204 | result = __register_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme", |
1205 | &nvme_dev_fops); | |
1206 | if (result < 0) | |
1207 | goto unregister_blkdev; | |
1208 | else if (result > 0) | |
1209 | nvme_char_major = result; | |
1210 | ||
1211 | nvme_class = class_create(THIS_MODULE, "nvme"); | |
1212 | if (IS_ERR(nvme_class)) { | |
1213 | result = PTR_ERR(nvme_class); | |
1214 | goto unregister_chrdev; | |
1215 | } | |
1216 | ||
5bae7f73 | 1217 | return 0; |
f3ca80fc CH |
1218 | |
1219 | unregister_chrdev: | |
1220 | __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme"); | |
1221 | unregister_blkdev: | |
1222 | unregister_blkdev(nvme_major, "nvme"); | |
1223 | return result; | |
5bae7f73 CH |
1224 | } |
1225 | ||
1226 | void nvme_core_exit(void) | |
1227 | { | |
1228 | unregister_blkdev(nvme_major, "nvme"); | |
f3ca80fc CH |
1229 | class_destroy(nvme_class); |
1230 | __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme"); | |
5bae7f73 | 1231 | } |