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Commit | Line | Data |
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f2298c04 | 1 | #include <linux/module.h> |
fc1bc354 | 2 | |
f2298c04 JA |
3 | #include <linux/moduleparam.h> |
4 | #include <linux/sched.h> | |
5 | #include <linux/fs.h> | |
6 | #include <linux/blkdev.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/slab.h> | |
9 | #include <linux/blk-mq.h> | |
10 | #include <linux/hrtimer.h> | |
b2b7e001 | 11 | #include <linux/lightnvm.h> |
f2298c04 JA |
12 | |
13 | struct nullb_cmd { | |
14 | struct list_head list; | |
15 | struct llist_node ll_list; | |
16 | struct call_single_data csd; | |
17 | struct request *rq; | |
18 | struct bio *bio; | |
19 | unsigned int tag; | |
20 | struct nullb_queue *nq; | |
3c395a96 | 21 | struct hrtimer timer; |
f2298c04 JA |
22 | }; |
23 | ||
24 | struct nullb_queue { | |
25 | unsigned long *tag_map; | |
26 | wait_queue_head_t wait; | |
27 | unsigned int queue_depth; | |
28 | ||
29 | struct nullb_cmd *cmds; | |
30 | }; | |
31 | ||
32 | struct nullb { | |
33 | struct list_head list; | |
34 | unsigned int index; | |
35 | struct request_queue *q; | |
36 | struct gendisk *disk; | |
b0b4e09c | 37 | struct nvm_dev *ndev; |
24d2f903 | 38 | struct blk_mq_tag_set tag_set; |
f2298c04 JA |
39 | struct hrtimer timer; |
40 | unsigned int queue_depth; | |
41 | spinlock_t lock; | |
42 | ||
43 | struct nullb_queue *queues; | |
44 | unsigned int nr_queues; | |
b2b7e001 | 45 | char disk_name[DISK_NAME_LEN]; |
f2298c04 JA |
46 | }; |
47 | ||
48 | static LIST_HEAD(nullb_list); | |
49 | static struct mutex lock; | |
50 | static int null_major; | |
51 | static int nullb_indexes; | |
6bb9535b | 52 | static struct kmem_cache *ppa_cache; |
f2298c04 | 53 | |
f2298c04 JA |
54 | enum { |
55 | NULL_IRQ_NONE = 0, | |
56 | NULL_IRQ_SOFTIRQ = 1, | |
57 | NULL_IRQ_TIMER = 2, | |
ce2c350b | 58 | }; |
f2298c04 | 59 | |
ce2c350b | 60 | enum { |
f2298c04 JA |
61 | NULL_Q_BIO = 0, |
62 | NULL_Q_RQ = 1, | |
63 | NULL_Q_MQ = 2, | |
64 | }; | |
65 | ||
2d263a78 | 66 | static int submit_queues; |
f2298c04 JA |
67 | module_param(submit_queues, int, S_IRUGO); |
68 | MODULE_PARM_DESC(submit_queues, "Number of submission queues"); | |
69 | ||
70 | static int home_node = NUMA_NO_NODE; | |
71 | module_param(home_node, int, S_IRUGO); | |
72 | MODULE_PARM_DESC(home_node, "Home node for the device"); | |
73 | ||
74 | static int queue_mode = NULL_Q_MQ; | |
709c8667 MB |
75 | |
76 | static int null_param_store_val(const char *str, int *val, int min, int max) | |
77 | { | |
78 | int ret, new_val; | |
79 | ||
80 | ret = kstrtoint(str, 10, &new_val); | |
81 | if (ret) | |
82 | return -EINVAL; | |
83 | ||
84 | if (new_val < min || new_val > max) | |
85 | return -EINVAL; | |
86 | ||
87 | *val = new_val; | |
88 | return 0; | |
89 | } | |
90 | ||
91 | static int null_set_queue_mode(const char *str, const struct kernel_param *kp) | |
92 | { | |
93 | return null_param_store_val(str, &queue_mode, NULL_Q_BIO, NULL_Q_MQ); | |
94 | } | |
95 | ||
9c27847d | 96 | static const struct kernel_param_ops null_queue_mode_param_ops = { |
709c8667 MB |
97 | .set = null_set_queue_mode, |
98 | .get = param_get_int, | |
99 | }; | |
100 | ||
101 | device_param_cb(queue_mode, &null_queue_mode_param_ops, &queue_mode, S_IRUGO); | |
54ae81cd | 102 | MODULE_PARM_DESC(queue_mode, "Block interface to use (0=bio,1=rq,2=multiqueue)"); |
f2298c04 JA |
103 | |
104 | static int gb = 250; | |
105 | module_param(gb, int, S_IRUGO); | |
106 | MODULE_PARM_DESC(gb, "Size in GB"); | |
107 | ||
108 | static int bs = 512; | |
109 | module_param(bs, int, S_IRUGO); | |
110 | MODULE_PARM_DESC(bs, "Block size (in bytes)"); | |
111 | ||
112 | static int nr_devices = 2; | |
113 | module_param(nr_devices, int, S_IRUGO); | |
114 | MODULE_PARM_DESC(nr_devices, "Number of devices to register"); | |
115 | ||
b2b7e001 MB |
116 | static bool use_lightnvm; |
117 | module_param(use_lightnvm, bool, S_IRUGO); | |
118 | MODULE_PARM_DESC(use_lightnvm, "Register as a LightNVM device"); | |
119 | ||
f2298c04 | 120 | static int irqmode = NULL_IRQ_SOFTIRQ; |
709c8667 MB |
121 | |
122 | static int null_set_irqmode(const char *str, const struct kernel_param *kp) | |
123 | { | |
124 | return null_param_store_val(str, &irqmode, NULL_IRQ_NONE, | |
125 | NULL_IRQ_TIMER); | |
126 | } | |
127 | ||
9c27847d | 128 | static const struct kernel_param_ops null_irqmode_param_ops = { |
709c8667 MB |
129 | .set = null_set_irqmode, |
130 | .get = param_get_int, | |
131 | }; | |
132 | ||
133 | device_param_cb(irqmode, &null_irqmode_param_ops, &irqmode, S_IRUGO); | |
f2298c04 JA |
134 | MODULE_PARM_DESC(irqmode, "IRQ completion handler. 0-none, 1-softirq, 2-timer"); |
135 | ||
dbac1175 AA |
136 | static unsigned long completion_nsec = 10000; |
137 | module_param(completion_nsec, ulong, S_IRUGO); | |
f2298c04 JA |
138 | MODULE_PARM_DESC(completion_nsec, "Time in ns to complete a request in hardware. Default: 10,000ns"); |
139 | ||
140 | static int hw_queue_depth = 64; | |
141 | module_param(hw_queue_depth, int, S_IRUGO); | |
142 | MODULE_PARM_DESC(hw_queue_depth, "Queue depth for each hardware queue. Default: 64"); | |
143 | ||
20005244 | 144 | static bool use_per_node_hctx = false; |
f2298c04 | 145 | module_param(use_per_node_hctx, bool, S_IRUGO); |
20005244 | 146 | MODULE_PARM_DESC(use_per_node_hctx, "Use per-node allocation for hardware context queues. Default: false"); |
f2298c04 JA |
147 | |
148 | static void put_tag(struct nullb_queue *nq, unsigned int tag) | |
149 | { | |
150 | clear_bit_unlock(tag, nq->tag_map); | |
151 | ||
152 | if (waitqueue_active(&nq->wait)) | |
153 | wake_up(&nq->wait); | |
154 | } | |
155 | ||
156 | static unsigned int get_tag(struct nullb_queue *nq) | |
157 | { | |
158 | unsigned int tag; | |
159 | ||
160 | do { | |
161 | tag = find_first_zero_bit(nq->tag_map, nq->queue_depth); | |
162 | if (tag >= nq->queue_depth) | |
163 | return -1U; | |
164 | } while (test_and_set_bit_lock(tag, nq->tag_map)); | |
165 | ||
166 | return tag; | |
167 | } | |
168 | ||
169 | static void free_cmd(struct nullb_cmd *cmd) | |
170 | { | |
171 | put_tag(cmd->nq, cmd->tag); | |
172 | } | |
173 | ||
3c395a96 PV |
174 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer); |
175 | ||
f2298c04 JA |
176 | static struct nullb_cmd *__alloc_cmd(struct nullb_queue *nq) |
177 | { | |
178 | struct nullb_cmd *cmd; | |
179 | unsigned int tag; | |
180 | ||
181 | tag = get_tag(nq); | |
182 | if (tag != -1U) { | |
183 | cmd = &nq->cmds[tag]; | |
184 | cmd->tag = tag; | |
185 | cmd->nq = nq; | |
3c395a96 PV |
186 | if (irqmode == NULL_IRQ_TIMER) { |
187 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, | |
188 | HRTIMER_MODE_REL); | |
189 | cmd->timer.function = null_cmd_timer_expired; | |
190 | } | |
f2298c04 JA |
191 | return cmd; |
192 | } | |
193 | ||
194 | return NULL; | |
195 | } | |
196 | ||
197 | static struct nullb_cmd *alloc_cmd(struct nullb_queue *nq, int can_wait) | |
198 | { | |
199 | struct nullb_cmd *cmd; | |
200 | DEFINE_WAIT(wait); | |
201 | ||
202 | cmd = __alloc_cmd(nq); | |
203 | if (cmd || !can_wait) | |
204 | return cmd; | |
205 | ||
206 | do { | |
207 | prepare_to_wait(&nq->wait, &wait, TASK_UNINTERRUPTIBLE); | |
208 | cmd = __alloc_cmd(nq); | |
209 | if (cmd) | |
210 | break; | |
211 | ||
212 | io_schedule(); | |
213 | } while (1); | |
214 | ||
215 | finish_wait(&nq->wait, &wait); | |
216 | return cmd; | |
217 | } | |
218 | ||
219 | static void end_cmd(struct nullb_cmd *cmd) | |
220 | { | |
cf8ecc5a AA |
221 | struct request_queue *q = NULL; |
222 | ||
e8271201 MK |
223 | if (cmd->rq) |
224 | q = cmd->rq->q; | |
225 | ||
ce2c350b CH |
226 | switch (queue_mode) { |
227 | case NULL_Q_MQ: | |
c8a446ad | 228 | blk_mq_end_request(cmd->rq, 0); |
ce2c350b CH |
229 | return; |
230 | case NULL_Q_RQ: | |
231 | INIT_LIST_HEAD(&cmd->rq->queuelist); | |
232 | blk_end_request_all(cmd->rq, 0); | |
233 | break; | |
234 | case NULL_Q_BIO: | |
4246a0b6 | 235 | bio_endio(cmd->bio); |
48cc661e | 236 | break; |
ce2c350b | 237 | } |
f2298c04 | 238 | |
48cc661e JA |
239 | free_cmd(cmd); |
240 | ||
cf8ecc5a | 241 | /* Restart queue if needed, as we are freeing a tag */ |
48cc661e | 242 | if (queue_mode == NULL_Q_RQ && blk_queue_stopped(q)) { |
cf8ecc5a AA |
243 | unsigned long flags; |
244 | ||
245 | spin_lock_irqsave(q->queue_lock, flags); | |
48cc661e | 246 | blk_start_queue_async(q); |
cf8ecc5a | 247 | spin_unlock_irqrestore(q->queue_lock, flags); |
f2298c04 | 248 | } |
cf8ecc5a AA |
249 | } |
250 | ||
251 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer) | |
252 | { | |
253 | end_cmd(container_of(timer, struct nullb_cmd, timer)); | |
f2298c04 JA |
254 | |
255 | return HRTIMER_NORESTART; | |
256 | } | |
257 | ||
258 | static void null_cmd_end_timer(struct nullb_cmd *cmd) | |
259 | { | |
8b0e1953 | 260 | ktime_t kt = completion_nsec; |
f2298c04 | 261 | |
3c395a96 | 262 | hrtimer_start(&cmd->timer, kt, HRTIMER_MODE_REL); |
f2298c04 JA |
263 | } |
264 | ||
265 | static void null_softirq_done_fn(struct request *rq) | |
266 | { | |
d891fa70 JA |
267 | if (queue_mode == NULL_Q_MQ) |
268 | end_cmd(blk_mq_rq_to_pdu(rq)); | |
269 | else | |
270 | end_cmd(rq->special); | |
f2298c04 JA |
271 | } |
272 | ||
f2298c04 JA |
273 | static inline void null_handle_cmd(struct nullb_cmd *cmd) |
274 | { | |
275 | /* Complete IO by inline, softirq or timer */ | |
276 | switch (irqmode) { | |
f2298c04 | 277 | case NULL_IRQ_SOFTIRQ: |
ce2c350b CH |
278 | switch (queue_mode) { |
279 | case NULL_Q_MQ: | |
f4829a9b | 280 | blk_mq_complete_request(cmd->rq, cmd->rq->errors); |
ce2c350b CH |
281 | break; |
282 | case NULL_Q_RQ: | |
283 | blk_complete_request(cmd->rq); | |
284 | break; | |
285 | case NULL_Q_BIO: | |
286 | /* | |
287 | * XXX: no proper submitting cpu information available. | |
288 | */ | |
289 | end_cmd(cmd); | |
290 | break; | |
291 | } | |
292 | break; | |
293 | case NULL_IRQ_NONE: | |
f2298c04 | 294 | end_cmd(cmd); |
f2298c04 JA |
295 | break; |
296 | case NULL_IRQ_TIMER: | |
297 | null_cmd_end_timer(cmd); | |
298 | break; | |
299 | } | |
300 | } | |
301 | ||
302 | static struct nullb_queue *nullb_to_queue(struct nullb *nullb) | |
303 | { | |
304 | int index = 0; | |
305 | ||
306 | if (nullb->nr_queues != 1) | |
307 | index = raw_smp_processor_id() / ((nr_cpu_ids + nullb->nr_queues - 1) / nullb->nr_queues); | |
308 | ||
309 | return &nullb->queues[index]; | |
310 | } | |
311 | ||
dece1635 | 312 | static blk_qc_t null_queue_bio(struct request_queue *q, struct bio *bio) |
f2298c04 JA |
313 | { |
314 | struct nullb *nullb = q->queuedata; | |
315 | struct nullb_queue *nq = nullb_to_queue(nullb); | |
316 | struct nullb_cmd *cmd; | |
317 | ||
318 | cmd = alloc_cmd(nq, 1); | |
319 | cmd->bio = bio; | |
320 | ||
321 | null_handle_cmd(cmd); | |
dece1635 | 322 | return BLK_QC_T_NONE; |
f2298c04 JA |
323 | } |
324 | ||
325 | static int null_rq_prep_fn(struct request_queue *q, struct request *req) | |
326 | { | |
327 | struct nullb *nullb = q->queuedata; | |
328 | struct nullb_queue *nq = nullb_to_queue(nullb); | |
329 | struct nullb_cmd *cmd; | |
330 | ||
331 | cmd = alloc_cmd(nq, 0); | |
332 | if (cmd) { | |
333 | cmd->rq = req; | |
334 | req->special = cmd; | |
335 | return BLKPREP_OK; | |
336 | } | |
8b70f45e | 337 | blk_stop_queue(q); |
f2298c04 JA |
338 | |
339 | return BLKPREP_DEFER; | |
340 | } | |
341 | ||
342 | static void null_request_fn(struct request_queue *q) | |
343 | { | |
344 | struct request *rq; | |
345 | ||
346 | while ((rq = blk_fetch_request(q)) != NULL) { | |
347 | struct nullb_cmd *cmd = rq->special; | |
348 | ||
349 | spin_unlock_irq(q->queue_lock); | |
350 | null_handle_cmd(cmd); | |
351 | spin_lock_irq(q->queue_lock); | |
352 | } | |
353 | } | |
354 | ||
74c45052 JA |
355 | static int null_queue_rq(struct blk_mq_hw_ctx *hctx, |
356 | const struct blk_mq_queue_data *bd) | |
f2298c04 | 357 | { |
74c45052 | 358 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(bd->rq); |
f2298c04 | 359 | |
3c395a96 PV |
360 | if (irqmode == NULL_IRQ_TIMER) { |
361 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
362 | cmd->timer.function = null_cmd_timer_expired; | |
363 | } | |
74c45052 | 364 | cmd->rq = bd->rq; |
f2298c04 JA |
365 | cmd->nq = hctx->driver_data; |
366 | ||
74c45052 | 367 | blk_mq_start_request(bd->rq); |
e2490073 | 368 | |
f2298c04 JA |
369 | null_handle_cmd(cmd); |
370 | return BLK_MQ_RQ_QUEUE_OK; | |
371 | } | |
372 | ||
2d263a78 MB |
373 | static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq) |
374 | { | |
375 | BUG_ON(!nullb); | |
376 | BUG_ON(!nq); | |
377 | ||
378 | init_waitqueue_head(&nq->wait); | |
379 | nq->queue_depth = nullb->queue_depth; | |
380 | } | |
381 | ||
f2298c04 JA |
382 | static int null_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, |
383 | unsigned int index) | |
384 | { | |
385 | struct nullb *nullb = data; | |
386 | struct nullb_queue *nq = &nullb->queues[index]; | |
387 | ||
f2298c04 | 388 | hctx->driver_data = nq; |
2d263a78 MB |
389 | null_init_queue(nullb, nq); |
390 | nullb->nr_queues++; | |
f2298c04 JA |
391 | |
392 | return 0; | |
393 | } | |
394 | ||
395 | static struct blk_mq_ops null_mq_ops = { | |
396 | .queue_rq = null_queue_rq, | |
f2298c04 | 397 | .init_hctx = null_init_hctx, |
ce2c350b | 398 | .complete = null_softirq_done_fn, |
f2298c04 JA |
399 | }; |
400 | ||
de65d2d2 MB |
401 | static void cleanup_queue(struct nullb_queue *nq) |
402 | { | |
403 | kfree(nq->tag_map); | |
404 | kfree(nq->cmds); | |
405 | } | |
406 | ||
407 | static void cleanup_queues(struct nullb *nullb) | |
408 | { | |
409 | int i; | |
410 | ||
411 | for (i = 0; i < nullb->nr_queues; i++) | |
412 | cleanup_queue(&nullb->queues[i]); | |
413 | ||
414 | kfree(nullb->queues); | |
415 | } | |
416 | ||
b2b7e001 MB |
417 | #ifdef CONFIG_NVM |
418 | ||
419 | static void null_lnvm_end_io(struct request *rq, int error) | |
420 | { | |
421 | struct nvm_rq *rqd = rq->end_io_data; | |
b2b7e001 | 422 | |
91276162 | 423 | nvm_end_io(rqd, error); |
b2b7e001 MB |
424 | |
425 | blk_put_request(rq); | |
426 | } | |
427 | ||
16f26c3a | 428 | static int null_lnvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd) |
b2b7e001 | 429 | { |
16f26c3a | 430 | struct request_queue *q = dev->q; |
b2b7e001 MB |
431 | struct request *rq; |
432 | struct bio *bio = rqd->bio; | |
433 | ||
aebf526b CH |
434 | rq = blk_mq_alloc_request(q, |
435 | op_is_write(bio_op(bio)) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); | |
b2b7e001 MB |
436 | if (IS_ERR(rq)) |
437 | return -ENOMEM; | |
438 | ||
b2b7e001 MB |
439 | rq->__sector = bio->bi_iter.bi_sector; |
440 | rq->ioprio = bio_prio(bio); | |
441 | ||
442 | if (bio_has_data(bio)) | |
443 | rq->nr_phys_segments = bio_phys_segments(q, bio); | |
444 | ||
445 | rq->__data_len = bio->bi_iter.bi_size; | |
446 | rq->bio = rq->biotail = bio; | |
447 | ||
448 | rq->end_io_data = rqd; | |
449 | ||
450 | blk_execute_rq_nowait(q, NULL, rq, 0, null_lnvm_end_io); | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
16f26c3a | 455 | static int null_lnvm_id(struct nvm_dev *dev, struct nvm_id *id) |
b2b7e001 MB |
456 | { |
457 | sector_t size = gb * 1024 * 1024 * 1024ULL; | |
5b40db99 | 458 | sector_t blksize; |
b2b7e001 MB |
459 | struct nvm_id_group *grp; |
460 | ||
461 | id->ver_id = 0x1; | |
462 | id->vmnt = 0; | |
463 | id->cgrps = 1; | |
bf643185 | 464 | id->cap = 0x2; |
b2b7e001 | 465 | id->dom = 0x1; |
5b40db99 MB |
466 | |
467 | id->ppaf.blk_offset = 0; | |
468 | id->ppaf.blk_len = 16; | |
469 | id->ppaf.pg_offset = 16; | |
470 | id->ppaf.pg_len = 16; | |
471 | id->ppaf.sect_offset = 32; | |
472 | id->ppaf.sect_len = 8; | |
473 | id->ppaf.pln_offset = 40; | |
474 | id->ppaf.pln_len = 8; | |
475 | id->ppaf.lun_offset = 48; | |
476 | id->ppaf.lun_len = 8; | |
477 | id->ppaf.ch_offset = 56; | |
478 | id->ppaf.ch_len = 8; | |
b2b7e001 | 479 | |
e93d12ae AB |
480 | sector_div(size, bs); /* convert size to pages */ |
481 | size >>= 8; /* concert size to pgs pr blk */ | |
b2b7e001 MB |
482 | grp = &id->groups[0]; |
483 | grp->mtype = 0; | |
5b40db99 | 484 | grp->fmtype = 0; |
b2b7e001 | 485 | grp->num_ch = 1; |
b2b7e001 | 486 | grp->num_pg = 256; |
5b40db99 | 487 | blksize = size; |
e93d12ae | 488 | size >>= 16; |
5b40db99 | 489 | grp->num_lun = size + 1; |
e93d12ae | 490 | sector_div(blksize, grp->num_lun); |
5b40db99 MB |
491 | grp->num_blk = blksize; |
492 | grp->num_pln = 1; | |
493 | ||
b2b7e001 MB |
494 | grp->fpg_sz = bs; |
495 | grp->csecs = bs; | |
496 | grp->trdt = 25000; | |
497 | grp->trdm = 25000; | |
498 | grp->tprt = 500000; | |
499 | grp->tprm = 500000; | |
500 | grp->tbet = 1500000; | |
501 | grp->tbem = 1500000; | |
502 | grp->mpos = 0x010101; /* single plane rwe */ | |
503 | grp->cpar = hw_queue_depth; | |
504 | ||
505 | return 0; | |
506 | } | |
507 | ||
16f26c3a | 508 | static void *null_lnvm_create_dma_pool(struct nvm_dev *dev, char *name) |
b2b7e001 MB |
509 | { |
510 | mempool_t *virtmem_pool; | |
511 | ||
6bb9535b | 512 | virtmem_pool = mempool_create_slab_pool(64, ppa_cache); |
b2b7e001 MB |
513 | if (!virtmem_pool) { |
514 | pr_err("null_blk: Unable to create virtual memory pool\n"); | |
515 | return NULL; | |
516 | } | |
517 | ||
518 | return virtmem_pool; | |
519 | } | |
520 | ||
521 | static void null_lnvm_destroy_dma_pool(void *pool) | |
522 | { | |
523 | mempool_destroy(pool); | |
524 | } | |
525 | ||
16f26c3a | 526 | static void *null_lnvm_dev_dma_alloc(struct nvm_dev *dev, void *pool, |
b2b7e001 MB |
527 | gfp_t mem_flags, dma_addr_t *dma_handler) |
528 | { | |
529 | return mempool_alloc(pool, mem_flags); | |
530 | } | |
531 | ||
532 | static void null_lnvm_dev_dma_free(void *pool, void *entry, | |
533 | dma_addr_t dma_handler) | |
534 | { | |
535 | mempool_free(entry, pool); | |
536 | } | |
537 | ||
538 | static struct nvm_dev_ops null_lnvm_dev_ops = { | |
539 | .identity = null_lnvm_id, | |
540 | .submit_io = null_lnvm_submit_io, | |
541 | ||
542 | .create_dma_pool = null_lnvm_create_dma_pool, | |
543 | .destroy_dma_pool = null_lnvm_destroy_dma_pool, | |
544 | .dev_dma_alloc = null_lnvm_dev_dma_alloc, | |
545 | .dev_dma_free = null_lnvm_dev_dma_free, | |
546 | ||
547 | /* Simulate nvme protocol restriction */ | |
548 | .max_phys_sect = 64, | |
549 | }; | |
9ae2d0aa MB |
550 | |
551 | static int null_nvm_register(struct nullb *nullb) | |
552 | { | |
b0b4e09c MB |
553 | struct nvm_dev *dev; |
554 | int rv; | |
555 | ||
556 | dev = nvm_alloc_dev(0); | |
557 | if (!dev) | |
558 | return -ENOMEM; | |
559 | ||
560 | dev->q = nullb->q; | |
561 | memcpy(dev->name, nullb->disk_name, DISK_NAME_LEN); | |
562 | dev->ops = &null_lnvm_dev_ops; | |
563 | ||
564 | rv = nvm_register(dev); | |
565 | if (rv) { | |
566 | kfree(dev); | |
567 | return rv; | |
568 | } | |
569 | nullb->ndev = dev; | |
570 | return 0; | |
9ae2d0aa MB |
571 | } |
572 | ||
573 | static void null_nvm_unregister(struct nullb *nullb) | |
574 | { | |
b0b4e09c | 575 | nvm_unregister(nullb->ndev); |
9ae2d0aa | 576 | } |
b2b7e001 | 577 | #else |
9ae2d0aa MB |
578 | static int null_nvm_register(struct nullb *nullb) |
579 | { | |
92153d30 | 580 | pr_err("null_blk: CONFIG_NVM needs to be enabled for LightNVM\n"); |
9ae2d0aa MB |
581 | return -EINVAL; |
582 | } | |
583 | static void null_nvm_unregister(struct nullb *nullb) {} | |
b2b7e001 MB |
584 | #endif /* CONFIG_NVM */ |
585 | ||
9ae2d0aa MB |
586 | static void null_del_dev(struct nullb *nullb) |
587 | { | |
588 | list_del_init(&nullb->list); | |
589 | ||
590 | if (use_lightnvm) | |
591 | null_nvm_unregister(nullb); | |
592 | else | |
593 | del_gendisk(nullb->disk); | |
594 | blk_cleanup_queue(nullb->q); | |
595 | if (queue_mode == NULL_Q_MQ) | |
596 | blk_mq_free_tag_set(&nullb->tag_set); | |
597 | if (!use_lightnvm) | |
598 | put_disk(nullb->disk); | |
599 | cleanup_queues(nullb); | |
600 | kfree(nullb); | |
601 | } | |
602 | ||
f2298c04 JA |
603 | static int null_open(struct block_device *bdev, fmode_t mode) |
604 | { | |
605 | return 0; | |
606 | } | |
607 | ||
608 | static void null_release(struct gendisk *disk, fmode_t mode) | |
609 | { | |
610 | } | |
611 | ||
612 | static const struct block_device_operations null_fops = { | |
613 | .owner = THIS_MODULE, | |
614 | .open = null_open, | |
615 | .release = null_release, | |
616 | }; | |
617 | ||
618 | static int setup_commands(struct nullb_queue *nq) | |
619 | { | |
620 | struct nullb_cmd *cmd; | |
621 | int i, tag_size; | |
622 | ||
623 | nq->cmds = kzalloc(nq->queue_depth * sizeof(*cmd), GFP_KERNEL); | |
624 | if (!nq->cmds) | |
2d263a78 | 625 | return -ENOMEM; |
f2298c04 JA |
626 | |
627 | tag_size = ALIGN(nq->queue_depth, BITS_PER_LONG) / BITS_PER_LONG; | |
628 | nq->tag_map = kzalloc(tag_size * sizeof(unsigned long), GFP_KERNEL); | |
629 | if (!nq->tag_map) { | |
630 | kfree(nq->cmds); | |
2d263a78 | 631 | return -ENOMEM; |
f2298c04 JA |
632 | } |
633 | ||
634 | for (i = 0; i < nq->queue_depth; i++) { | |
635 | cmd = &nq->cmds[i]; | |
636 | INIT_LIST_HEAD(&cmd->list); | |
637 | cmd->ll_list.next = NULL; | |
638 | cmd->tag = -1U; | |
639 | } | |
640 | ||
641 | return 0; | |
642 | } | |
643 | ||
f2298c04 JA |
644 | static int setup_queues(struct nullb *nullb) |
645 | { | |
2d263a78 MB |
646 | nullb->queues = kzalloc(submit_queues * sizeof(struct nullb_queue), |
647 | GFP_KERNEL); | |
f2298c04 | 648 | if (!nullb->queues) |
2d263a78 | 649 | return -ENOMEM; |
f2298c04 JA |
650 | |
651 | nullb->nr_queues = 0; | |
652 | nullb->queue_depth = hw_queue_depth; | |
653 | ||
2d263a78 MB |
654 | return 0; |
655 | } | |
656 | ||
657 | static int init_driver_queues(struct nullb *nullb) | |
658 | { | |
659 | struct nullb_queue *nq; | |
660 | int i, ret = 0; | |
f2298c04 JA |
661 | |
662 | for (i = 0; i < submit_queues; i++) { | |
663 | nq = &nullb->queues[i]; | |
2d263a78 MB |
664 | |
665 | null_init_queue(nullb, nq); | |
666 | ||
667 | ret = setup_commands(nq); | |
668 | if (ret) | |
31f9690e | 669 | return ret; |
f2298c04 JA |
670 | nullb->nr_queues++; |
671 | } | |
2d263a78 | 672 | return 0; |
f2298c04 JA |
673 | } |
674 | ||
9ae2d0aa | 675 | static int null_gendisk_register(struct nullb *nullb) |
f2298c04 JA |
676 | { |
677 | struct gendisk *disk; | |
f2298c04 | 678 | sector_t size; |
9ae2d0aa MB |
679 | |
680 | disk = nullb->disk = alloc_disk_node(1, home_node); | |
681 | if (!disk) | |
682 | return -ENOMEM; | |
683 | size = gb * 1024 * 1024 * 1024ULL; | |
684 | set_capacity(disk, size >> 9); | |
685 | ||
686 | disk->flags |= GENHD_FL_EXT_DEVT | GENHD_FL_SUPPRESS_PARTITION_INFO; | |
687 | disk->major = null_major; | |
688 | disk->first_minor = nullb->index; | |
689 | disk->fops = &null_fops; | |
690 | disk->private_data = nullb; | |
691 | disk->queue = nullb->q; | |
692 | strncpy(disk->disk_name, nullb->disk_name, DISK_NAME_LEN); | |
693 | ||
694 | add_disk(disk); | |
695 | return 0; | |
696 | } | |
697 | ||
698 | static int null_add_dev(void) | |
699 | { | |
700 | struct nullb *nullb; | |
dc501dc0 | 701 | int rv; |
f2298c04 JA |
702 | |
703 | nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, home_node); | |
dc501dc0 RE |
704 | if (!nullb) { |
705 | rv = -ENOMEM; | |
24d2f903 | 706 | goto out; |
dc501dc0 | 707 | } |
f2298c04 JA |
708 | |
709 | spin_lock_init(&nullb->lock); | |
710 | ||
57053d8c MB |
711 | if (queue_mode == NULL_Q_MQ && use_per_node_hctx) |
712 | submit_queues = nr_online_nodes; | |
713 | ||
dc501dc0 RE |
714 | rv = setup_queues(nullb); |
715 | if (rv) | |
24d2f903 | 716 | goto out_free_nullb; |
f2298c04 JA |
717 | |
718 | if (queue_mode == NULL_Q_MQ) { | |
cdef54dd | 719 | nullb->tag_set.ops = &null_mq_ops; |
24d2f903 CH |
720 | nullb->tag_set.nr_hw_queues = submit_queues; |
721 | nullb->tag_set.queue_depth = hw_queue_depth; | |
722 | nullb->tag_set.numa_node = home_node; | |
723 | nullb->tag_set.cmd_size = sizeof(struct nullb_cmd); | |
724 | nullb->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; | |
725 | nullb->tag_set.driver_data = nullb; | |
726 | ||
dc501dc0 RE |
727 | rv = blk_mq_alloc_tag_set(&nullb->tag_set); |
728 | if (rv) | |
24d2f903 CH |
729 | goto out_cleanup_queues; |
730 | ||
731 | nullb->q = blk_mq_init_queue(&nullb->tag_set); | |
35b489d3 | 732 | if (IS_ERR(nullb->q)) { |
dc501dc0 | 733 | rv = -ENOMEM; |
24d2f903 | 734 | goto out_cleanup_tags; |
dc501dc0 | 735 | } |
f2298c04 JA |
736 | } else if (queue_mode == NULL_Q_BIO) { |
737 | nullb->q = blk_alloc_queue_node(GFP_KERNEL, home_node); | |
dc501dc0 RE |
738 | if (!nullb->q) { |
739 | rv = -ENOMEM; | |
24d2f903 | 740 | goto out_cleanup_queues; |
dc501dc0 | 741 | } |
f2298c04 | 742 | blk_queue_make_request(nullb->q, null_queue_bio); |
31f9690e JK |
743 | rv = init_driver_queues(nullb); |
744 | if (rv) | |
745 | goto out_cleanup_blk_queue; | |
f2298c04 JA |
746 | } else { |
747 | nullb->q = blk_init_queue_node(null_request_fn, &nullb->lock, home_node); | |
dc501dc0 RE |
748 | if (!nullb->q) { |
749 | rv = -ENOMEM; | |
24d2f903 | 750 | goto out_cleanup_queues; |
dc501dc0 | 751 | } |
f2298c04 | 752 | blk_queue_prep_rq(nullb->q, null_rq_prep_fn); |
24d2f903 | 753 | blk_queue_softirq_done(nullb->q, null_softirq_done_fn); |
31f9690e JK |
754 | rv = init_driver_queues(nullb); |
755 | if (rv) | |
756 | goto out_cleanup_blk_queue; | |
f2298c04 JA |
757 | } |
758 | ||
f2298c04 JA |
759 | nullb->q->queuedata = nullb; |
760 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, nullb->q); | |
b277da0a | 761 | queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, nullb->q); |
f2298c04 | 762 | |
f2298c04 | 763 | mutex_lock(&lock); |
f2298c04 JA |
764 | nullb->index = nullb_indexes++; |
765 | mutex_unlock(&lock); | |
766 | ||
767 | blk_queue_logical_block_size(nullb->q, bs); | |
768 | blk_queue_physical_block_size(nullb->q, bs); | |
769 | ||
b2b7e001 MB |
770 | sprintf(nullb->disk_name, "nullb%d", nullb->index); |
771 | ||
9ae2d0aa MB |
772 | if (use_lightnvm) |
773 | rv = null_nvm_register(nullb); | |
774 | else | |
775 | rv = null_gendisk_register(nullb); | |
b2b7e001 | 776 | |
9ae2d0aa MB |
777 | if (rv) |
778 | goto out_cleanup_blk_queue; | |
a514379b MB |
779 | |
780 | mutex_lock(&lock); | |
781 | list_add_tail(&nullb->list, &nullb_list); | |
782 | mutex_unlock(&lock); | |
3681c85d | 783 | |
f2298c04 | 784 | return 0; |
24d2f903 CH |
785 | out_cleanup_blk_queue: |
786 | blk_cleanup_queue(nullb->q); | |
787 | out_cleanup_tags: | |
788 | if (queue_mode == NULL_Q_MQ) | |
789 | blk_mq_free_tag_set(&nullb->tag_set); | |
790 | out_cleanup_queues: | |
791 | cleanup_queues(nullb); | |
792 | out_free_nullb: | |
793 | kfree(nullb); | |
794 | out: | |
dc501dc0 | 795 | return rv; |
f2298c04 JA |
796 | } |
797 | ||
798 | static int __init null_init(void) | |
799 | { | |
af096e22 | 800 | int ret = 0; |
f2298c04 | 801 | unsigned int i; |
af096e22 | 802 | struct nullb *nullb; |
f2298c04 | 803 | |
9967d8ac R |
804 | if (bs > PAGE_SIZE) { |
805 | pr_warn("null_blk: invalid block size\n"); | |
806 | pr_warn("null_blk: defaults block size to %lu\n", PAGE_SIZE); | |
807 | bs = PAGE_SIZE; | |
808 | } | |
f2298c04 | 809 | |
6bb9535b MB |
810 | if (use_lightnvm && bs != 4096) { |
811 | pr_warn("null_blk: LightNVM only supports 4k block size\n"); | |
812 | pr_warn("null_blk: defaults block size to 4k\n"); | |
813 | bs = 4096; | |
814 | } | |
815 | ||
b2b7e001 MB |
816 | if (use_lightnvm && queue_mode != NULL_Q_MQ) { |
817 | pr_warn("null_blk: LightNVM only supported for blk-mq\n"); | |
818 | pr_warn("null_blk: defaults queue mode to blk-mq\n"); | |
819 | queue_mode = NULL_Q_MQ; | |
820 | } | |
821 | ||
d15ee6b1 | 822 | if (queue_mode == NULL_Q_MQ && use_per_node_hctx) { |
fc1bc354 | 823 | if (submit_queues < nr_online_nodes) { |
d15ee6b1 MB |
824 | pr_warn("null_blk: submit_queues param is set to %u.", |
825 | nr_online_nodes); | |
fc1bc354 MB |
826 | submit_queues = nr_online_nodes; |
827 | } | |
d15ee6b1 | 828 | } else if (submit_queues > nr_cpu_ids) |
f2298c04 JA |
829 | submit_queues = nr_cpu_ids; |
830 | else if (!submit_queues) | |
831 | submit_queues = 1; | |
832 | ||
833 | mutex_init(&lock); | |
834 | ||
f2298c04 JA |
835 | null_major = register_blkdev(0, "nullb"); |
836 | if (null_major < 0) | |
837 | return null_major; | |
838 | ||
6bb9535b MB |
839 | if (use_lightnvm) { |
840 | ppa_cache = kmem_cache_create("ppa_cache", 64 * sizeof(u64), | |
841 | 0, 0, NULL); | |
842 | if (!ppa_cache) { | |
843 | pr_err("null_blk: unable to create ppa cache\n"); | |
af096e22 MH |
844 | ret = -ENOMEM; |
845 | goto err_ppa; | |
6bb9535b MB |
846 | } |
847 | } | |
848 | ||
f2298c04 | 849 | for (i = 0; i < nr_devices; i++) { |
af096e22 MH |
850 | ret = null_add_dev(); |
851 | if (ret) | |
852 | goto err_dev; | |
f2298c04 JA |
853 | } |
854 | ||
855 | pr_info("null: module loaded\n"); | |
856 | return 0; | |
af096e22 MH |
857 | |
858 | err_dev: | |
859 | while (!list_empty(&nullb_list)) { | |
860 | nullb = list_entry(nullb_list.next, struct nullb, list); | |
861 | null_del_dev(nullb); | |
862 | } | |
6bb9535b | 863 | kmem_cache_destroy(ppa_cache); |
af096e22 MH |
864 | err_ppa: |
865 | unregister_blkdev(null_major, "nullb"); | |
866 | return ret; | |
f2298c04 JA |
867 | } |
868 | ||
869 | static void __exit null_exit(void) | |
870 | { | |
871 | struct nullb *nullb; | |
872 | ||
873 | unregister_blkdev(null_major, "nullb"); | |
874 | ||
875 | mutex_lock(&lock); | |
876 | while (!list_empty(&nullb_list)) { | |
877 | nullb = list_entry(nullb_list.next, struct nullb, list); | |
878 | null_del_dev(nullb); | |
879 | } | |
880 | mutex_unlock(&lock); | |
6bb9535b MB |
881 | |
882 | kmem_cache_destroy(ppa_cache); | |
f2298c04 JA |
883 | } |
884 | ||
885 | module_init(null_init); | |
886 | module_exit(null_exit); | |
887 | ||
888 | MODULE_AUTHOR("Jens Axboe <jaxboe@fusionio.com>"); | |
889 | MODULE_LICENSE("GPL"); |