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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 | ||
db5bcf87 JA |
120 | static bool blocking; |
121 | module_param(blocking, bool, S_IRUGO); | |
122 | MODULE_PARM_DESC(blocking, "Register as a blocking blk-mq driver device"); | |
123 | ||
f2298c04 | 124 | static int irqmode = NULL_IRQ_SOFTIRQ; |
709c8667 MB |
125 | |
126 | static int null_set_irqmode(const char *str, const struct kernel_param *kp) | |
127 | { | |
128 | return null_param_store_val(str, &irqmode, NULL_IRQ_NONE, | |
129 | NULL_IRQ_TIMER); | |
130 | } | |
131 | ||
9c27847d | 132 | static const struct kernel_param_ops null_irqmode_param_ops = { |
709c8667 MB |
133 | .set = null_set_irqmode, |
134 | .get = param_get_int, | |
135 | }; | |
136 | ||
137 | device_param_cb(irqmode, &null_irqmode_param_ops, &irqmode, S_IRUGO); | |
f2298c04 JA |
138 | MODULE_PARM_DESC(irqmode, "IRQ completion handler. 0-none, 1-softirq, 2-timer"); |
139 | ||
dbac1175 AA |
140 | static unsigned long completion_nsec = 10000; |
141 | module_param(completion_nsec, ulong, S_IRUGO); | |
f2298c04 JA |
142 | MODULE_PARM_DESC(completion_nsec, "Time in ns to complete a request in hardware. Default: 10,000ns"); |
143 | ||
144 | static int hw_queue_depth = 64; | |
145 | module_param(hw_queue_depth, int, S_IRUGO); | |
146 | MODULE_PARM_DESC(hw_queue_depth, "Queue depth for each hardware queue. Default: 64"); | |
147 | ||
20005244 | 148 | static bool use_per_node_hctx = false; |
f2298c04 | 149 | module_param(use_per_node_hctx, bool, S_IRUGO); |
20005244 | 150 | MODULE_PARM_DESC(use_per_node_hctx, "Use per-node allocation for hardware context queues. Default: false"); |
f2298c04 JA |
151 | |
152 | static void put_tag(struct nullb_queue *nq, unsigned int tag) | |
153 | { | |
154 | clear_bit_unlock(tag, nq->tag_map); | |
155 | ||
156 | if (waitqueue_active(&nq->wait)) | |
157 | wake_up(&nq->wait); | |
158 | } | |
159 | ||
160 | static unsigned int get_tag(struct nullb_queue *nq) | |
161 | { | |
162 | unsigned int tag; | |
163 | ||
164 | do { | |
165 | tag = find_first_zero_bit(nq->tag_map, nq->queue_depth); | |
166 | if (tag >= nq->queue_depth) | |
167 | return -1U; | |
168 | } while (test_and_set_bit_lock(tag, nq->tag_map)); | |
169 | ||
170 | return tag; | |
171 | } | |
172 | ||
173 | static void free_cmd(struct nullb_cmd *cmd) | |
174 | { | |
175 | put_tag(cmd->nq, cmd->tag); | |
176 | } | |
177 | ||
3c395a96 PV |
178 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer); |
179 | ||
f2298c04 JA |
180 | static struct nullb_cmd *__alloc_cmd(struct nullb_queue *nq) |
181 | { | |
182 | struct nullb_cmd *cmd; | |
183 | unsigned int tag; | |
184 | ||
185 | tag = get_tag(nq); | |
186 | if (tag != -1U) { | |
187 | cmd = &nq->cmds[tag]; | |
188 | cmd->tag = tag; | |
189 | cmd->nq = nq; | |
3c395a96 PV |
190 | if (irqmode == NULL_IRQ_TIMER) { |
191 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, | |
192 | HRTIMER_MODE_REL); | |
193 | cmd->timer.function = null_cmd_timer_expired; | |
194 | } | |
f2298c04 JA |
195 | return cmd; |
196 | } | |
197 | ||
198 | return NULL; | |
199 | } | |
200 | ||
201 | static struct nullb_cmd *alloc_cmd(struct nullb_queue *nq, int can_wait) | |
202 | { | |
203 | struct nullb_cmd *cmd; | |
204 | DEFINE_WAIT(wait); | |
205 | ||
206 | cmd = __alloc_cmd(nq); | |
207 | if (cmd || !can_wait) | |
208 | return cmd; | |
209 | ||
210 | do { | |
211 | prepare_to_wait(&nq->wait, &wait, TASK_UNINTERRUPTIBLE); | |
212 | cmd = __alloc_cmd(nq); | |
213 | if (cmd) | |
214 | break; | |
215 | ||
216 | io_schedule(); | |
217 | } while (1); | |
218 | ||
219 | finish_wait(&nq->wait, &wait); | |
220 | return cmd; | |
221 | } | |
222 | ||
223 | static void end_cmd(struct nullb_cmd *cmd) | |
224 | { | |
cf8ecc5a AA |
225 | struct request_queue *q = NULL; |
226 | ||
e8271201 MK |
227 | if (cmd->rq) |
228 | q = cmd->rq->q; | |
229 | ||
ce2c350b CH |
230 | switch (queue_mode) { |
231 | case NULL_Q_MQ: | |
c8a446ad | 232 | blk_mq_end_request(cmd->rq, 0); |
ce2c350b CH |
233 | return; |
234 | case NULL_Q_RQ: | |
235 | INIT_LIST_HEAD(&cmd->rq->queuelist); | |
236 | blk_end_request_all(cmd->rq, 0); | |
237 | break; | |
238 | case NULL_Q_BIO: | |
4246a0b6 | 239 | bio_endio(cmd->bio); |
48cc661e | 240 | break; |
ce2c350b | 241 | } |
f2298c04 | 242 | |
48cc661e JA |
243 | free_cmd(cmd); |
244 | ||
cf8ecc5a | 245 | /* Restart queue if needed, as we are freeing a tag */ |
48cc661e | 246 | if (queue_mode == NULL_Q_RQ && blk_queue_stopped(q)) { |
cf8ecc5a AA |
247 | unsigned long flags; |
248 | ||
249 | spin_lock_irqsave(q->queue_lock, flags); | |
48cc661e | 250 | blk_start_queue_async(q); |
cf8ecc5a | 251 | spin_unlock_irqrestore(q->queue_lock, flags); |
f2298c04 | 252 | } |
cf8ecc5a AA |
253 | } |
254 | ||
255 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer) | |
256 | { | |
257 | end_cmd(container_of(timer, struct nullb_cmd, timer)); | |
f2298c04 JA |
258 | |
259 | return HRTIMER_NORESTART; | |
260 | } | |
261 | ||
262 | static void null_cmd_end_timer(struct nullb_cmd *cmd) | |
263 | { | |
8b0e1953 | 264 | ktime_t kt = completion_nsec; |
f2298c04 | 265 | |
3c395a96 | 266 | hrtimer_start(&cmd->timer, kt, HRTIMER_MODE_REL); |
f2298c04 JA |
267 | } |
268 | ||
269 | static void null_softirq_done_fn(struct request *rq) | |
270 | { | |
d891fa70 JA |
271 | if (queue_mode == NULL_Q_MQ) |
272 | end_cmd(blk_mq_rq_to_pdu(rq)); | |
273 | else | |
274 | end_cmd(rq->special); | |
f2298c04 JA |
275 | } |
276 | ||
f2298c04 JA |
277 | static inline void null_handle_cmd(struct nullb_cmd *cmd) |
278 | { | |
279 | /* Complete IO by inline, softirq or timer */ | |
280 | switch (irqmode) { | |
f2298c04 | 281 | case NULL_IRQ_SOFTIRQ: |
ce2c350b CH |
282 | switch (queue_mode) { |
283 | case NULL_Q_MQ: | |
f4829a9b | 284 | blk_mq_complete_request(cmd->rq, cmd->rq->errors); |
ce2c350b CH |
285 | break; |
286 | case NULL_Q_RQ: | |
287 | blk_complete_request(cmd->rq); | |
288 | break; | |
289 | case NULL_Q_BIO: | |
290 | /* | |
291 | * XXX: no proper submitting cpu information available. | |
292 | */ | |
293 | end_cmd(cmd); | |
294 | break; | |
295 | } | |
296 | break; | |
297 | case NULL_IRQ_NONE: | |
f2298c04 | 298 | end_cmd(cmd); |
f2298c04 JA |
299 | break; |
300 | case NULL_IRQ_TIMER: | |
301 | null_cmd_end_timer(cmd); | |
302 | break; | |
303 | } | |
304 | } | |
305 | ||
306 | static struct nullb_queue *nullb_to_queue(struct nullb *nullb) | |
307 | { | |
308 | int index = 0; | |
309 | ||
310 | if (nullb->nr_queues != 1) | |
311 | index = raw_smp_processor_id() / ((nr_cpu_ids + nullb->nr_queues - 1) / nullb->nr_queues); | |
312 | ||
313 | return &nullb->queues[index]; | |
314 | } | |
315 | ||
dece1635 | 316 | static blk_qc_t null_queue_bio(struct request_queue *q, struct bio *bio) |
f2298c04 JA |
317 | { |
318 | struct nullb *nullb = q->queuedata; | |
319 | struct nullb_queue *nq = nullb_to_queue(nullb); | |
320 | struct nullb_cmd *cmd; | |
321 | ||
322 | cmd = alloc_cmd(nq, 1); | |
323 | cmd->bio = bio; | |
324 | ||
325 | null_handle_cmd(cmd); | |
dece1635 | 326 | return BLK_QC_T_NONE; |
f2298c04 JA |
327 | } |
328 | ||
329 | static int null_rq_prep_fn(struct request_queue *q, struct request *req) | |
330 | { | |
331 | struct nullb *nullb = q->queuedata; | |
332 | struct nullb_queue *nq = nullb_to_queue(nullb); | |
333 | struct nullb_cmd *cmd; | |
334 | ||
335 | cmd = alloc_cmd(nq, 0); | |
336 | if (cmd) { | |
337 | cmd->rq = req; | |
338 | req->special = cmd; | |
339 | return BLKPREP_OK; | |
340 | } | |
8b70f45e | 341 | blk_stop_queue(q); |
f2298c04 JA |
342 | |
343 | return BLKPREP_DEFER; | |
344 | } | |
345 | ||
346 | static void null_request_fn(struct request_queue *q) | |
347 | { | |
348 | struct request *rq; | |
349 | ||
350 | while ((rq = blk_fetch_request(q)) != NULL) { | |
351 | struct nullb_cmd *cmd = rq->special; | |
352 | ||
353 | spin_unlock_irq(q->queue_lock); | |
354 | null_handle_cmd(cmd); | |
355 | spin_lock_irq(q->queue_lock); | |
356 | } | |
357 | } | |
358 | ||
74c45052 JA |
359 | static int null_queue_rq(struct blk_mq_hw_ctx *hctx, |
360 | const struct blk_mq_queue_data *bd) | |
f2298c04 | 361 | { |
74c45052 | 362 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(bd->rq); |
f2298c04 | 363 | |
db5bcf87 JA |
364 | might_sleep_if(hctx->flags & BLK_MQ_F_BLOCKING); |
365 | ||
3c395a96 PV |
366 | if (irqmode == NULL_IRQ_TIMER) { |
367 | hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
368 | cmd->timer.function = null_cmd_timer_expired; | |
369 | } | |
74c45052 | 370 | cmd->rq = bd->rq; |
f2298c04 JA |
371 | cmd->nq = hctx->driver_data; |
372 | ||
74c45052 | 373 | blk_mq_start_request(bd->rq); |
e2490073 | 374 | |
f2298c04 JA |
375 | null_handle_cmd(cmd); |
376 | return BLK_MQ_RQ_QUEUE_OK; | |
377 | } | |
378 | ||
2d263a78 MB |
379 | static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq) |
380 | { | |
381 | BUG_ON(!nullb); | |
382 | BUG_ON(!nq); | |
383 | ||
384 | init_waitqueue_head(&nq->wait); | |
385 | nq->queue_depth = nullb->queue_depth; | |
386 | } | |
387 | ||
f2298c04 JA |
388 | static int null_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, |
389 | unsigned int index) | |
390 | { | |
391 | struct nullb *nullb = data; | |
392 | struct nullb_queue *nq = &nullb->queues[index]; | |
393 | ||
f2298c04 | 394 | hctx->driver_data = nq; |
2d263a78 MB |
395 | null_init_queue(nullb, nq); |
396 | nullb->nr_queues++; | |
f2298c04 JA |
397 | |
398 | return 0; | |
399 | } | |
400 | ||
f363b089 | 401 | static const struct blk_mq_ops null_mq_ops = { |
f2298c04 | 402 | .queue_rq = null_queue_rq, |
f2298c04 | 403 | .init_hctx = null_init_hctx, |
ce2c350b | 404 | .complete = null_softirq_done_fn, |
f2298c04 JA |
405 | }; |
406 | ||
de65d2d2 MB |
407 | static void cleanup_queue(struct nullb_queue *nq) |
408 | { | |
409 | kfree(nq->tag_map); | |
410 | kfree(nq->cmds); | |
411 | } | |
412 | ||
413 | static void cleanup_queues(struct nullb *nullb) | |
414 | { | |
415 | int i; | |
416 | ||
417 | for (i = 0; i < nullb->nr_queues; i++) | |
418 | cleanup_queue(&nullb->queues[i]); | |
419 | ||
420 | kfree(nullb->queues); | |
421 | } | |
422 | ||
b2b7e001 MB |
423 | #ifdef CONFIG_NVM |
424 | ||
425 | static void null_lnvm_end_io(struct request *rq, int error) | |
426 | { | |
427 | struct nvm_rq *rqd = rq->end_io_data; | |
b2b7e001 | 428 | |
06894efe MB |
429 | rqd->error = error; |
430 | nvm_end_io(rqd); | |
b2b7e001 MB |
431 | |
432 | blk_put_request(rq); | |
433 | } | |
434 | ||
16f26c3a | 435 | static int null_lnvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd) |
b2b7e001 | 436 | { |
16f26c3a | 437 | struct request_queue *q = dev->q; |
b2b7e001 MB |
438 | struct request *rq; |
439 | struct bio *bio = rqd->bio; | |
440 | ||
aebf526b CH |
441 | rq = blk_mq_alloc_request(q, |
442 | op_is_write(bio_op(bio)) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); | |
b2b7e001 MB |
443 | if (IS_ERR(rq)) |
444 | return -ENOMEM; | |
445 | ||
b2b7e001 MB |
446 | rq->__sector = bio->bi_iter.bi_sector; |
447 | rq->ioprio = bio_prio(bio); | |
448 | ||
449 | if (bio_has_data(bio)) | |
450 | rq->nr_phys_segments = bio_phys_segments(q, bio); | |
451 | ||
452 | rq->__data_len = bio->bi_iter.bi_size; | |
453 | rq->bio = rq->biotail = bio; | |
454 | ||
455 | rq->end_io_data = rqd; | |
456 | ||
457 | blk_execute_rq_nowait(q, NULL, rq, 0, null_lnvm_end_io); | |
458 | ||
459 | return 0; | |
460 | } | |
461 | ||
16f26c3a | 462 | static int null_lnvm_id(struct nvm_dev *dev, struct nvm_id *id) |
b2b7e001 MB |
463 | { |
464 | sector_t size = gb * 1024 * 1024 * 1024ULL; | |
5b40db99 | 465 | sector_t blksize; |
b2b7e001 MB |
466 | struct nvm_id_group *grp; |
467 | ||
468 | id->ver_id = 0x1; | |
469 | id->vmnt = 0; | |
bf643185 | 470 | id->cap = 0x2; |
b2b7e001 | 471 | id->dom = 0x1; |
5b40db99 MB |
472 | |
473 | id->ppaf.blk_offset = 0; | |
474 | id->ppaf.blk_len = 16; | |
475 | id->ppaf.pg_offset = 16; | |
476 | id->ppaf.pg_len = 16; | |
477 | id->ppaf.sect_offset = 32; | |
478 | id->ppaf.sect_len = 8; | |
479 | id->ppaf.pln_offset = 40; | |
480 | id->ppaf.pln_len = 8; | |
481 | id->ppaf.lun_offset = 48; | |
482 | id->ppaf.lun_len = 8; | |
483 | id->ppaf.ch_offset = 56; | |
484 | id->ppaf.ch_len = 8; | |
b2b7e001 | 485 | |
e93d12ae AB |
486 | sector_div(size, bs); /* convert size to pages */ |
487 | size >>= 8; /* concert size to pgs pr blk */ | |
19bd6fe7 | 488 | grp = &id->grp; |
b2b7e001 | 489 | grp->mtype = 0; |
5b40db99 | 490 | grp->fmtype = 0; |
b2b7e001 | 491 | grp->num_ch = 1; |
b2b7e001 | 492 | grp->num_pg = 256; |
5b40db99 | 493 | blksize = size; |
e93d12ae | 494 | size >>= 16; |
5b40db99 | 495 | grp->num_lun = size + 1; |
e93d12ae | 496 | sector_div(blksize, grp->num_lun); |
5b40db99 MB |
497 | grp->num_blk = blksize; |
498 | grp->num_pln = 1; | |
499 | ||
b2b7e001 MB |
500 | grp->fpg_sz = bs; |
501 | grp->csecs = bs; | |
502 | grp->trdt = 25000; | |
503 | grp->trdm = 25000; | |
504 | grp->tprt = 500000; | |
505 | grp->tprm = 500000; | |
506 | grp->tbet = 1500000; | |
507 | grp->tbem = 1500000; | |
508 | grp->mpos = 0x010101; /* single plane rwe */ | |
509 | grp->cpar = hw_queue_depth; | |
510 | ||
511 | return 0; | |
512 | } | |
513 | ||
16f26c3a | 514 | static void *null_lnvm_create_dma_pool(struct nvm_dev *dev, char *name) |
b2b7e001 MB |
515 | { |
516 | mempool_t *virtmem_pool; | |
517 | ||
6bb9535b | 518 | virtmem_pool = mempool_create_slab_pool(64, ppa_cache); |
b2b7e001 MB |
519 | if (!virtmem_pool) { |
520 | pr_err("null_blk: Unable to create virtual memory pool\n"); | |
521 | return NULL; | |
522 | } | |
523 | ||
524 | return virtmem_pool; | |
525 | } | |
526 | ||
527 | static void null_lnvm_destroy_dma_pool(void *pool) | |
528 | { | |
529 | mempool_destroy(pool); | |
530 | } | |
531 | ||
16f26c3a | 532 | static void *null_lnvm_dev_dma_alloc(struct nvm_dev *dev, void *pool, |
b2b7e001 MB |
533 | gfp_t mem_flags, dma_addr_t *dma_handler) |
534 | { | |
535 | return mempool_alloc(pool, mem_flags); | |
536 | } | |
537 | ||
538 | static void null_lnvm_dev_dma_free(void *pool, void *entry, | |
539 | dma_addr_t dma_handler) | |
540 | { | |
541 | mempool_free(entry, pool); | |
542 | } | |
543 | ||
544 | static struct nvm_dev_ops null_lnvm_dev_ops = { | |
545 | .identity = null_lnvm_id, | |
546 | .submit_io = null_lnvm_submit_io, | |
547 | ||
548 | .create_dma_pool = null_lnvm_create_dma_pool, | |
549 | .destroy_dma_pool = null_lnvm_destroy_dma_pool, | |
550 | .dev_dma_alloc = null_lnvm_dev_dma_alloc, | |
551 | .dev_dma_free = null_lnvm_dev_dma_free, | |
552 | ||
553 | /* Simulate nvme protocol restriction */ | |
554 | .max_phys_sect = 64, | |
555 | }; | |
9ae2d0aa MB |
556 | |
557 | static int null_nvm_register(struct nullb *nullb) | |
558 | { | |
b0b4e09c MB |
559 | struct nvm_dev *dev; |
560 | int rv; | |
561 | ||
562 | dev = nvm_alloc_dev(0); | |
563 | if (!dev) | |
564 | return -ENOMEM; | |
565 | ||
566 | dev->q = nullb->q; | |
567 | memcpy(dev->name, nullb->disk_name, DISK_NAME_LEN); | |
568 | dev->ops = &null_lnvm_dev_ops; | |
569 | ||
570 | rv = nvm_register(dev); | |
571 | if (rv) { | |
572 | kfree(dev); | |
573 | return rv; | |
574 | } | |
575 | nullb->ndev = dev; | |
576 | return 0; | |
9ae2d0aa MB |
577 | } |
578 | ||
579 | static void null_nvm_unregister(struct nullb *nullb) | |
580 | { | |
b0b4e09c | 581 | nvm_unregister(nullb->ndev); |
9ae2d0aa | 582 | } |
b2b7e001 | 583 | #else |
9ae2d0aa MB |
584 | static int null_nvm_register(struct nullb *nullb) |
585 | { | |
92153d30 | 586 | pr_err("null_blk: CONFIG_NVM needs to be enabled for LightNVM\n"); |
9ae2d0aa MB |
587 | return -EINVAL; |
588 | } | |
589 | static void null_nvm_unregister(struct nullb *nullb) {} | |
b2b7e001 MB |
590 | #endif /* CONFIG_NVM */ |
591 | ||
9ae2d0aa MB |
592 | static void null_del_dev(struct nullb *nullb) |
593 | { | |
594 | list_del_init(&nullb->list); | |
595 | ||
596 | if (use_lightnvm) | |
597 | null_nvm_unregister(nullb); | |
598 | else | |
599 | del_gendisk(nullb->disk); | |
600 | blk_cleanup_queue(nullb->q); | |
601 | if (queue_mode == NULL_Q_MQ) | |
602 | blk_mq_free_tag_set(&nullb->tag_set); | |
603 | if (!use_lightnvm) | |
604 | put_disk(nullb->disk); | |
605 | cleanup_queues(nullb); | |
606 | kfree(nullb); | |
607 | } | |
608 | ||
f2298c04 JA |
609 | static int null_open(struct block_device *bdev, fmode_t mode) |
610 | { | |
611 | return 0; | |
612 | } | |
613 | ||
614 | static void null_release(struct gendisk *disk, fmode_t mode) | |
615 | { | |
616 | } | |
617 | ||
618 | static const struct block_device_operations null_fops = { | |
619 | .owner = THIS_MODULE, | |
620 | .open = null_open, | |
621 | .release = null_release, | |
622 | }; | |
623 | ||
624 | static int setup_commands(struct nullb_queue *nq) | |
625 | { | |
626 | struct nullb_cmd *cmd; | |
627 | int i, tag_size; | |
628 | ||
629 | nq->cmds = kzalloc(nq->queue_depth * sizeof(*cmd), GFP_KERNEL); | |
630 | if (!nq->cmds) | |
2d263a78 | 631 | return -ENOMEM; |
f2298c04 JA |
632 | |
633 | tag_size = ALIGN(nq->queue_depth, BITS_PER_LONG) / BITS_PER_LONG; | |
634 | nq->tag_map = kzalloc(tag_size * sizeof(unsigned long), GFP_KERNEL); | |
635 | if (!nq->tag_map) { | |
636 | kfree(nq->cmds); | |
2d263a78 | 637 | return -ENOMEM; |
f2298c04 JA |
638 | } |
639 | ||
640 | for (i = 0; i < nq->queue_depth; i++) { | |
641 | cmd = &nq->cmds[i]; | |
642 | INIT_LIST_HEAD(&cmd->list); | |
643 | cmd->ll_list.next = NULL; | |
644 | cmd->tag = -1U; | |
645 | } | |
646 | ||
647 | return 0; | |
648 | } | |
649 | ||
f2298c04 JA |
650 | static int setup_queues(struct nullb *nullb) |
651 | { | |
2d263a78 MB |
652 | nullb->queues = kzalloc(submit_queues * sizeof(struct nullb_queue), |
653 | GFP_KERNEL); | |
f2298c04 | 654 | if (!nullb->queues) |
2d263a78 | 655 | return -ENOMEM; |
f2298c04 JA |
656 | |
657 | nullb->nr_queues = 0; | |
658 | nullb->queue_depth = hw_queue_depth; | |
659 | ||
2d263a78 MB |
660 | return 0; |
661 | } | |
662 | ||
663 | static int init_driver_queues(struct nullb *nullb) | |
664 | { | |
665 | struct nullb_queue *nq; | |
666 | int i, ret = 0; | |
f2298c04 JA |
667 | |
668 | for (i = 0; i < submit_queues; i++) { | |
669 | nq = &nullb->queues[i]; | |
2d263a78 MB |
670 | |
671 | null_init_queue(nullb, nq); | |
672 | ||
673 | ret = setup_commands(nq); | |
674 | if (ret) | |
31f9690e | 675 | return ret; |
f2298c04 JA |
676 | nullb->nr_queues++; |
677 | } | |
2d263a78 | 678 | return 0; |
f2298c04 JA |
679 | } |
680 | ||
9ae2d0aa | 681 | static int null_gendisk_register(struct nullb *nullb) |
f2298c04 JA |
682 | { |
683 | struct gendisk *disk; | |
f2298c04 | 684 | sector_t size; |
9ae2d0aa MB |
685 | |
686 | disk = nullb->disk = alloc_disk_node(1, home_node); | |
687 | if (!disk) | |
688 | return -ENOMEM; | |
689 | size = gb * 1024 * 1024 * 1024ULL; | |
690 | set_capacity(disk, size >> 9); | |
691 | ||
692 | disk->flags |= GENHD_FL_EXT_DEVT | GENHD_FL_SUPPRESS_PARTITION_INFO; | |
693 | disk->major = null_major; | |
694 | disk->first_minor = nullb->index; | |
695 | disk->fops = &null_fops; | |
696 | disk->private_data = nullb; | |
697 | disk->queue = nullb->q; | |
698 | strncpy(disk->disk_name, nullb->disk_name, DISK_NAME_LEN); | |
699 | ||
700 | add_disk(disk); | |
701 | return 0; | |
702 | } | |
703 | ||
704 | static int null_add_dev(void) | |
705 | { | |
706 | struct nullb *nullb; | |
dc501dc0 | 707 | int rv; |
f2298c04 JA |
708 | |
709 | nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, home_node); | |
dc501dc0 RE |
710 | if (!nullb) { |
711 | rv = -ENOMEM; | |
24d2f903 | 712 | goto out; |
dc501dc0 | 713 | } |
f2298c04 JA |
714 | |
715 | spin_lock_init(&nullb->lock); | |
716 | ||
57053d8c MB |
717 | if (queue_mode == NULL_Q_MQ && use_per_node_hctx) |
718 | submit_queues = nr_online_nodes; | |
719 | ||
dc501dc0 RE |
720 | rv = setup_queues(nullb); |
721 | if (rv) | |
24d2f903 | 722 | goto out_free_nullb; |
f2298c04 JA |
723 | |
724 | if (queue_mode == NULL_Q_MQ) { | |
cdef54dd | 725 | nullb->tag_set.ops = &null_mq_ops; |
24d2f903 CH |
726 | nullb->tag_set.nr_hw_queues = submit_queues; |
727 | nullb->tag_set.queue_depth = hw_queue_depth; | |
728 | nullb->tag_set.numa_node = home_node; | |
729 | nullb->tag_set.cmd_size = sizeof(struct nullb_cmd); | |
730 | nullb->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; | |
731 | nullb->tag_set.driver_data = nullb; | |
732 | ||
db5bcf87 JA |
733 | if (blocking) |
734 | nullb->tag_set.flags |= BLK_MQ_F_BLOCKING; | |
735 | ||
dc501dc0 RE |
736 | rv = blk_mq_alloc_tag_set(&nullb->tag_set); |
737 | if (rv) | |
24d2f903 CH |
738 | goto out_cleanup_queues; |
739 | ||
740 | nullb->q = blk_mq_init_queue(&nullb->tag_set); | |
35b489d3 | 741 | if (IS_ERR(nullb->q)) { |
dc501dc0 | 742 | rv = -ENOMEM; |
24d2f903 | 743 | goto out_cleanup_tags; |
dc501dc0 | 744 | } |
f2298c04 JA |
745 | } else if (queue_mode == NULL_Q_BIO) { |
746 | nullb->q = blk_alloc_queue_node(GFP_KERNEL, home_node); | |
dc501dc0 RE |
747 | if (!nullb->q) { |
748 | rv = -ENOMEM; | |
24d2f903 | 749 | goto out_cleanup_queues; |
dc501dc0 | 750 | } |
f2298c04 | 751 | blk_queue_make_request(nullb->q, null_queue_bio); |
31f9690e JK |
752 | rv = init_driver_queues(nullb); |
753 | if (rv) | |
754 | goto out_cleanup_blk_queue; | |
f2298c04 JA |
755 | } else { |
756 | nullb->q = blk_init_queue_node(null_request_fn, &nullb->lock, home_node); | |
dc501dc0 RE |
757 | if (!nullb->q) { |
758 | rv = -ENOMEM; | |
24d2f903 | 759 | goto out_cleanup_queues; |
dc501dc0 | 760 | } |
f2298c04 | 761 | blk_queue_prep_rq(nullb->q, null_rq_prep_fn); |
24d2f903 | 762 | blk_queue_softirq_done(nullb->q, null_softirq_done_fn); |
31f9690e JK |
763 | rv = init_driver_queues(nullb); |
764 | if (rv) | |
765 | goto out_cleanup_blk_queue; | |
f2298c04 JA |
766 | } |
767 | ||
f2298c04 JA |
768 | nullb->q->queuedata = nullb; |
769 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, nullb->q); | |
b277da0a | 770 | queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, nullb->q); |
f2298c04 | 771 | |
f2298c04 | 772 | mutex_lock(&lock); |
f2298c04 JA |
773 | nullb->index = nullb_indexes++; |
774 | mutex_unlock(&lock); | |
775 | ||
776 | blk_queue_logical_block_size(nullb->q, bs); | |
777 | blk_queue_physical_block_size(nullb->q, bs); | |
778 | ||
b2b7e001 MB |
779 | sprintf(nullb->disk_name, "nullb%d", nullb->index); |
780 | ||
9ae2d0aa MB |
781 | if (use_lightnvm) |
782 | rv = null_nvm_register(nullb); | |
783 | else | |
784 | rv = null_gendisk_register(nullb); | |
b2b7e001 | 785 | |
9ae2d0aa MB |
786 | if (rv) |
787 | goto out_cleanup_blk_queue; | |
a514379b MB |
788 | |
789 | mutex_lock(&lock); | |
790 | list_add_tail(&nullb->list, &nullb_list); | |
791 | mutex_unlock(&lock); | |
3681c85d | 792 | |
f2298c04 | 793 | return 0; |
24d2f903 CH |
794 | out_cleanup_blk_queue: |
795 | blk_cleanup_queue(nullb->q); | |
796 | out_cleanup_tags: | |
797 | if (queue_mode == NULL_Q_MQ) | |
798 | blk_mq_free_tag_set(&nullb->tag_set); | |
799 | out_cleanup_queues: | |
800 | cleanup_queues(nullb); | |
801 | out_free_nullb: | |
802 | kfree(nullb); | |
803 | out: | |
dc501dc0 | 804 | return rv; |
f2298c04 JA |
805 | } |
806 | ||
807 | static int __init null_init(void) | |
808 | { | |
af096e22 | 809 | int ret = 0; |
f2298c04 | 810 | unsigned int i; |
af096e22 | 811 | struct nullb *nullb; |
f2298c04 | 812 | |
9967d8ac R |
813 | if (bs > PAGE_SIZE) { |
814 | pr_warn("null_blk: invalid block size\n"); | |
815 | pr_warn("null_blk: defaults block size to %lu\n", PAGE_SIZE); | |
816 | bs = PAGE_SIZE; | |
817 | } | |
f2298c04 | 818 | |
6bb9535b MB |
819 | if (use_lightnvm && bs != 4096) { |
820 | pr_warn("null_blk: LightNVM only supports 4k block size\n"); | |
821 | pr_warn("null_blk: defaults block size to 4k\n"); | |
822 | bs = 4096; | |
823 | } | |
824 | ||
b2b7e001 MB |
825 | if (use_lightnvm && queue_mode != NULL_Q_MQ) { |
826 | pr_warn("null_blk: LightNVM only supported for blk-mq\n"); | |
827 | pr_warn("null_blk: defaults queue mode to blk-mq\n"); | |
828 | queue_mode = NULL_Q_MQ; | |
829 | } | |
830 | ||
d15ee6b1 | 831 | if (queue_mode == NULL_Q_MQ && use_per_node_hctx) { |
fc1bc354 | 832 | if (submit_queues < nr_online_nodes) { |
d15ee6b1 MB |
833 | pr_warn("null_blk: submit_queues param is set to %u.", |
834 | nr_online_nodes); | |
fc1bc354 MB |
835 | submit_queues = nr_online_nodes; |
836 | } | |
d15ee6b1 | 837 | } else if (submit_queues > nr_cpu_ids) |
f2298c04 JA |
838 | submit_queues = nr_cpu_ids; |
839 | else if (!submit_queues) | |
840 | submit_queues = 1; | |
841 | ||
842 | mutex_init(&lock); | |
843 | ||
f2298c04 JA |
844 | null_major = register_blkdev(0, "nullb"); |
845 | if (null_major < 0) | |
846 | return null_major; | |
847 | ||
6bb9535b MB |
848 | if (use_lightnvm) { |
849 | ppa_cache = kmem_cache_create("ppa_cache", 64 * sizeof(u64), | |
850 | 0, 0, NULL); | |
851 | if (!ppa_cache) { | |
852 | pr_err("null_blk: unable to create ppa cache\n"); | |
af096e22 MH |
853 | ret = -ENOMEM; |
854 | goto err_ppa; | |
6bb9535b MB |
855 | } |
856 | } | |
857 | ||
f2298c04 | 858 | for (i = 0; i < nr_devices; i++) { |
af096e22 MH |
859 | ret = null_add_dev(); |
860 | if (ret) | |
861 | goto err_dev; | |
f2298c04 JA |
862 | } |
863 | ||
864 | pr_info("null: module loaded\n"); | |
865 | return 0; | |
af096e22 MH |
866 | |
867 | err_dev: | |
868 | while (!list_empty(&nullb_list)) { | |
869 | nullb = list_entry(nullb_list.next, struct nullb, list); | |
870 | null_del_dev(nullb); | |
871 | } | |
6bb9535b | 872 | kmem_cache_destroy(ppa_cache); |
af096e22 MH |
873 | err_ppa: |
874 | unregister_blkdev(null_major, "nullb"); | |
875 | return ret; | |
f2298c04 JA |
876 | } |
877 | ||
878 | static void __exit null_exit(void) | |
879 | { | |
880 | struct nullb *nullb; | |
881 | ||
882 | unregister_blkdev(null_major, "nullb"); | |
883 | ||
884 | mutex_lock(&lock); | |
885 | while (!list_empty(&nullb_list)) { | |
886 | nullb = list_entry(nullb_list.next, struct nullb, list); | |
887 | null_del_dev(nullb); | |
888 | } | |
889 | mutex_unlock(&lock); | |
6bb9535b MB |
890 | |
891 | kmem_cache_destroy(ppa_cache); | |
f2298c04 JA |
892 | } |
893 | ||
894 | module_init(null_init); | |
895 | module_exit(null_exit); | |
896 | ||
897 | MODULE_AUTHOR("Jens Axboe <jaxboe@fusionio.com>"); | |
898 | MODULE_LICENSE("GPL"); |