Commit | Line | Data |
---|---|---|
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; | |
21 | }; | |
22 | ||
23 | struct nullb_queue { | |
24 | unsigned long *tag_map; | |
25 | wait_queue_head_t wait; | |
26 | unsigned int queue_depth; | |
27 | ||
28 | struct nullb_cmd *cmds; | |
29 | }; | |
30 | ||
31 | struct nullb { | |
32 | struct list_head list; | |
33 | unsigned int index; | |
34 | struct request_queue *q; | |
35 | struct gendisk *disk; | |
24d2f903 | 36 | struct blk_mq_tag_set tag_set; |
f2298c04 JA |
37 | struct hrtimer timer; |
38 | unsigned int queue_depth; | |
39 | spinlock_t lock; | |
40 | ||
41 | struct nullb_queue *queues; | |
42 | unsigned int nr_queues; | |
b2b7e001 | 43 | char disk_name[DISK_NAME_LEN]; |
f2298c04 JA |
44 | }; |
45 | ||
46 | static LIST_HEAD(nullb_list); | |
47 | static struct mutex lock; | |
48 | static int null_major; | |
49 | static int nullb_indexes; | |
6bb9535b | 50 | static struct kmem_cache *ppa_cache; |
f2298c04 JA |
51 | |
52 | struct completion_queue { | |
53 | struct llist_head list; | |
54 | struct hrtimer timer; | |
55 | }; | |
56 | ||
57 | /* | |
58 | * These are per-cpu for now, they will need to be configured by the | |
59 | * complete_queues parameter and appropriately mapped. | |
60 | */ | |
61 | static DEFINE_PER_CPU(struct completion_queue, completion_queues); | |
62 | ||
63 | enum { | |
64 | NULL_IRQ_NONE = 0, | |
65 | NULL_IRQ_SOFTIRQ = 1, | |
66 | NULL_IRQ_TIMER = 2, | |
ce2c350b | 67 | }; |
f2298c04 | 68 | |
ce2c350b | 69 | enum { |
f2298c04 JA |
70 | NULL_Q_BIO = 0, |
71 | NULL_Q_RQ = 1, | |
72 | NULL_Q_MQ = 2, | |
73 | }; | |
74 | ||
2d263a78 | 75 | static int submit_queues; |
f2298c04 JA |
76 | module_param(submit_queues, int, S_IRUGO); |
77 | MODULE_PARM_DESC(submit_queues, "Number of submission queues"); | |
78 | ||
79 | static int home_node = NUMA_NO_NODE; | |
80 | module_param(home_node, int, S_IRUGO); | |
81 | MODULE_PARM_DESC(home_node, "Home node for the device"); | |
82 | ||
83 | static int queue_mode = NULL_Q_MQ; | |
709c8667 MB |
84 | |
85 | static int null_param_store_val(const char *str, int *val, int min, int max) | |
86 | { | |
87 | int ret, new_val; | |
88 | ||
89 | ret = kstrtoint(str, 10, &new_val); | |
90 | if (ret) | |
91 | return -EINVAL; | |
92 | ||
93 | if (new_val < min || new_val > max) | |
94 | return -EINVAL; | |
95 | ||
96 | *val = new_val; | |
97 | return 0; | |
98 | } | |
99 | ||
100 | static int null_set_queue_mode(const char *str, const struct kernel_param *kp) | |
101 | { | |
102 | return null_param_store_val(str, &queue_mode, NULL_Q_BIO, NULL_Q_MQ); | |
103 | } | |
104 | ||
9c27847d | 105 | static const struct kernel_param_ops null_queue_mode_param_ops = { |
709c8667 MB |
106 | .set = null_set_queue_mode, |
107 | .get = param_get_int, | |
108 | }; | |
109 | ||
110 | device_param_cb(queue_mode, &null_queue_mode_param_ops, &queue_mode, S_IRUGO); | |
54ae81cd | 111 | MODULE_PARM_DESC(queue_mode, "Block interface to use (0=bio,1=rq,2=multiqueue)"); |
f2298c04 JA |
112 | |
113 | static int gb = 250; | |
114 | module_param(gb, int, S_IRUGO); | |
115 | MODULE_PARM_DESC(gb, "Size in GB"); | |
116 | ||
117 | static int bs = 512; | |
118 | module_param(bs, int, S_IRUGO); | |
119 | MODULE_PARM_DESC(bs, "Block size (in bytes)"); | |
120 | ||
121 | static int nr_devices = 2; | |
122 | module_param(nr_devices, int, S_IRUGO); | |
123 | MODULE_PARM_DESC(nr_devices, "Number of devices to register"); | |
124 | ||
b2b7e001 MB |
125 | static bool use_lightnvm; |
126 | module_param(use_lightnvm, bool, S_IRUGO); | |
127 | MODULE_PARM_DESC(use_lightnvm, "Register as a LightNVM device"); | |
128 | ||
f2298c04 | 129 | static int irqmode = NULL_IRQ_SOFTIRQ; |
709c8667 MB |
130 | |
131 | static int null_set_irqmode(const char *str, const struct kernel_param *kp) | |
132 | { | |
133 | return null_param_store_val(str, &irqmode, NULL_IRQ_NONE, | |
134 | NULL_IRQ_TIMER); | |
135 | } | |
136 | ||
9c27847d | 137 | static const struct kernel_param_ops null_irqmode_param_ops = { |
709c8667 MB |
138 | .set = null_set_irqmode, |
139 | .get = param_get_int, | |
140 | }; | |
141 | ||
142 | device_param_cb(irqmode, &null_irqmode_param_ops, &irqmode, S_IRUGO); | |
f2298c04 JA |
143 | MODULE_PARM_DESC(irqmode, "IRQ completion handler. 0-none, 1-softirq, 2-timer"); |
144 | ||
145 | static int completion_nsec = 10000; | |
146 | module_param(completion_nsec, int, S_IRUGO); | |
147 | MODULE_PARM_DESC(completion_nsec, "Time in ns to complete a request in hardware. Default: 10,000ns"); | |
148 | ||
149 | static int hw_queue_depth = 64; | |
150 | module_param(hw_queue_depth, int, S_IRUGO); | |
151 | MODULE_PARM_DESC(hw_queue_depth, "Queue depth for each hardware queue. Default: 64"); | |
152 | ||
20005244 | 153 | static bool use_per_node_hctx = false; |
f2298c04 | 154 | module_param(use_per_node_hctx, bool, S_IRUGO); |
20005244 | 155 | MODULE_PARM_DESC(use_per_node_hctx, "Use per-node allocation for hardware context queues. Default: false"); |
f2298c04 JA |
156 | |
157 | static void put_tag(struct nullb_queue *nq, unsigned int tag) | |
158 | { | |
159 | clear_bit_unlock(tag, nq->tag_map); | |
160 | ||
161 | if (waitqueue_active(&nq->wait)) | |
162 | wake_up(&nq->wait); | |
163 | } | |
164 | ||
165 | static unsigned int get_tag(struct nullb_queue *nq) | |
166 | { | |
167 | unsigned int tag; | |
168 | ||
169 | do { | |
170 | tag = find_first_zero_bit(nq->tag_map, nq->queue_depth); | |
171 | if (tag >= nq->queue_depth) | |
172 | return -1U; | |
173 | } while (test_and_set_bit_lock(tag, nq->tag_map)); | |
174 | ||
175 | return tag; | |
176 | } | |
177 | ||
178 | static void free_cmd(struct nullb_cmd *cmd) | |
179 | { | |
180 | put_tag(cmd->nq, cmd->tag); | |
181 | } | |
182 | ||
183 | static struct nullb_cmd *__alloc_cmd(struct nullb_queue *nq) | |
184 | { | |
185 | struct nullb_cmd *cmd; | |
186 | unsigned int tag; | |
187 | ||
188 | tag = get_tag(nq); | |
189 | if (tag != -1U) { | |
190 | cmd = &nq->cmds[tag]; | |
191 | cmd->tag = tag; | |
192 | cmd->nq = nq; | |
193 | return cmd; | |
194 | } | |
195 | ||
196 | return NULL; | |
197 | } | |
198 | ||
199 | static struct nullb_cmd *alloc_cmd(struct nullb_queue *nq, int can_wait) | |
200 | { | |
201 | struct nullb_cmd *cmd; | |
202 | DEFINE_WAIT(wait); | |
203 | ||
204 | cmd = __alloc_cmd(nq); | |
205 | if (cmd || !can_wait) | |
206 | return cmd; | |
207 | ||
208 | do { | |
209 | prepare_to_wait(&nq->wait, &wait, TASK_UNINTERRUPTIBLE); | |
210 | cmd = __alloc_cmd(nq); | |
211 | if (cmd) | |
212 | break; | |
213 | ||
214 | io_schedule(); | |
215 | } while (1); | |
216 | ||
217 | finish_wait(&nq->wait, &wait); | |
218 | return cmd; | |
219 | } | |
220 | ||
221 | static void end_cmd(struct nullb_cmd *cmd) | |
222 | { | |
ce2c350b CH |
223 | switch (queue_mode) { |
224 | case NULL_Q_MQ: | |
c8a446ad | 225 | blk_mq_end_request(cmd->rq, 0); |
ce2c350b CH |
226 | return; |
227 | case NULL_Q_RQ: | |
228 | INIT_LIST_HEAD(&cmd->rq->queuelist); | |
229 | blk_end_request_all(cmd->rq, 0); | |
230 | break; | |
231 | case NULL_Q_BIO: | |
4246a0b6 | 232 | bio_endio(cmd->bio); |
ce2c350b CH |
233 | break; |
234 | } | |
f2298c04 | 235 | |
ce2c350b | 236 | free_cmd(cmd); |
f2298c04 JA |
237 | } |
238 | ||
239 | static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer) | |
240 | { | |
241 | struct completion_queue *cq; | |
242 | struct llist_node *entry; | |
243 | struct nullb_cmd *cmd; | |
244 | ||
245 | cq = &per_cpu(completion_queues, smp_processor_id()); | |
246 | ||
247 | while ((entry = llist_del_all(&cq->list)) != NULL) { | |
d7790b92 | 248 | entry = llist_reverse_order(entry); |
f2298c04 | 249 | do { |
21974061 MK |
250 | struct request_queue *q = NULL; |
251 | ||
f2298c04 | 252 | cmd = container_of(entry, struct nullb_cmd, ll_list); |
f2298c04 | 253 | entry = entry->next; |
21974061 MK |
254 | if (cmd->rq) |
255 | q = cmd->rq->q; | |
fc27691f | 256 | end_cmd(cmd); |
8b70f45e | 257 | |
21974061 MK |
258 | if (q && !q->mq_ops && blk_queue_stopped(q)) { |
259 | spin_lock(q->queue_lock); | |
260 | if (blk_queue_stopped(q)) | |
261 | blk_start_queue(q); | |
262 | spin_unlock(q->queue_lock); | |
8b70f45e | 263 | } |
f2298c04 JA |
264 | } while (entry); |
265 | } | |
266 | ||
267 | return HRTIMER_NORESTART; | |
268 | } | |
269 | ||
270 | static void null_cmd_end_timer(struct nullb_cmd *cmd) | |
271 | { | |
272 | struct completion_queue *cq = &per_cpu(completion_queues, get_cpu()); | |
273 | ||
274 | cmd->ll_list.next = NULL; | |
275 | if (llist_add(&cmd->ll_list, &cq->list)) { | |
276 | ktime_t kt = ktime_set(0, completion_nsec); | |
277 | ||
419c21a3 | 278 | hrtimer_start(&cq->timer, kt, HRTIMER_MODE_REL_PINNED); |
f2298c04 JA |
279 | } |
280 | ||
281 | put_cpu(); | |
282 | } | |
283 | ||
284 | static void null_softirq_done_fn(struct request *rq) | |
285 | { | |
d891fa70 JA |
286 | if (queue_mode == NULL_Q_MQ) |
287 | end_cmd(blk_mq_rq_to_pdu(rq)); | |
288 | else | |
289 | end_cmd(rq->special); | |
f2298c04 JA |
290 | } |
291 | ||
f2298c04 JA |
292 | static inline void null_handle_cmd(struct nullb_cmd *cmd) |
293 | { | |
294 | /* Complete IO by inline, softirq or timer */ | |
295 | switch (irqmode) { | |
f2298c04 | 296 | case NULL_IRQ_SOFTIRQ: |
ce2c350b CH |
297 | switch (queue_mode) { |
298 | case NULL_Q_MQ: | |
f4829a9b | 299 | blk_mq_complete_request(cmd->rq, cmd->rq->errors); |
ce2c350b CH |
300 | break; |
301 | case NULL_Q_RQ: | |
302 | blk_complete_request(cmd->rq); | |
303 | break; | |
304 | case NULL_Q_BIO: | |
305 | /* | |
306 | * XXX: no proper submitting cpu information available. | |
307 | */ | |
308 | end_cmd(cmd); | |
309 | break; | |
310 | } | |
311 | break; | |
312 | case NULL_IRQ_NONE: | |
f2298c04 | 313 | end_cmd(cmd); |
f2298c04 JA |
314 | break; |
315 | case NULL_IRQ_TIMER: | |
316 | null_cmd_end_timer(cmd); | |
317 | break; | |
318 | } | |
319 | } | |
320 | ||
321 | static struct nullb_queue *nullb_to_queue(struct nullb *nullb) | |
322 | { | |
323 | int index = 0; | |
324 | ||
325 | if (nullb->nr_queues != 1) | |
326 | index = raw_smp_processor_id() / ((nr_cpu_ids + nullb->nr_queues - 1) / nullb->nr_queues); | |
327 | ||
328 | return &nullb->queues[index]; | |
329 | } | |
330 | ||
dece1635 | 331 | static blk_qc_t null_queue_bio(struct request_queue *q, struct bio *bio) |
f2298c04 JA |
332 | { |
333 | struct nullb *nullb = q->queuedata; | |
334 | struct nullb_queue *nq = nullb_to_queue(nullb); | |
335 | struct nullb_cmd *cmd; | |
336 | ||
337 | cmd = alloc_cmd(nq, 1); | |
338 | cmd->bio = bio; | |
339 | ||
340 | null_handle_cmd(cmd); | |
dece1635 | 341 | return BLK_QC_T_NONE; |
f2298c04 JA |
342 | } |
343 | ||
344 | static int null_rq_prep_fn(struct request_queue *q, struct request *req) | |
345 | { | |
346 | struct nullb *nullb = q->queuedata; | |
347 | struct nullb_queue *nq = nullb_to_queue(nullb); | |
348 | struct nullb_cmd *cmd; | |
349 | ||
350 | cmd = alloc_cmd(nq, 0); | |
351 | if (cmd) { | |
352 | cmd->rq = req; | |
353 | req->special = cmd; | |
354 | return BLKPREP_OK; | |
355 | } | |
8b70f45e | 356 | blk_stop_queue(q); |
f2298c04 JA |
357 | |
358 | return BLKPREP_DEFER; | |
359 | } | |
360 | ||
361 | static void null_request_fn(struct request_queue *q) | |
362 | { | |
363 | struct request *rq; | |
364 | ||
365 | while ((rq = blk_fetch_request(q)) != NULL) { | |
366 | struct nullb_cmd *cmd = rq->special; | |
367 | ||
368 | spin_unlock_irq(q->queue_lock); | |
369 | null_handle_cmd(cmd); | |
370 | spin_lock_irq(q->queue_lock); | |
371 | } | |
372 | } | |
373 | ||
74c45052 JA |
374 | static int null_queue_rq(struct blk_mq_hw_ctx *hctx, |
375 | const struct blk_mq_queue_data *bd) | |
f2298c04 | 376 | { |
74c45052 | 377 | struct nullb_cmd *cmd = blk_mq_rq_to_pdu(bd->rq); |
f2298c04 | 378 | |
74c45052 | 379 | cmd->rq = bd->rq; |
f2298c04 JA |
380 | cmd->nq = hctx->driver_data; |
381 | ||
74c45052 | 382 | blk_mq_start_request(bd->rq); |
e2490073 | 383 | |
f2298c04 JA |
384 | null_handle_cmd(cmd); |
385 | return BLK_MQ_RQ_QUEUE_OK; | |
386 | } | |
387 | ||
2d263a78 MB |
388 | static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq) |
389 | { | |
390 | BUG_ON(!nullb); | |
391 | BUG_ON(!nq); | |
392 | ||
393 | init_waitqueue_head(&nq->wait); | |
394 | nq->queue_depth = nullb->queue_depth; | |
395 | } | |
396 | ||
f2298c04 JA |
397 | static int null_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, |
398 | unsigned int index) | |
399 | { | |
400 | struct nullb *nullb = data; | |
401 | struct nullb_queue *nq = &nullb->queues[index]; | |
402 | ||
f2298c04 | 403 | hctx->driver_data = nq; |
2d263a78 MB |
404 | null_init_queue(nullb, nq); |
405 | nullb->nr_queues++; | |
f2298c04 JA |
406 | |
407 | return 0; | |
408 | } | |
409 | ||
410 | static struct blk_mq_ops null_mq_ops = { | |
411 | .queue_rq = null_queue_rq, | |
412 | .map_queue = blk_mq_map_queue, | |
413 | .init_hctx = null_init_hctx, | |
ce2c350b | 414 | .complete = null_softirq_done_fn, |
f2298c04 JA |
415 | }; |
416 | ||
de65d2d2 MB |
417 | static void cleanup_queue(struct nullb_queue *nq) |
418 | { | |
419 | kfree(nq->tag_map); | |
420 | kfree(nq->cmds); | |
421 | } | |
422 | ||
423 | static void cleanup_queues(struct nullb *nullb) | |
424 | { | |
425 | int i; | |
426 | ||
427 | for (i = 0; i < nullb->nr_queues; i++) | |
428 | cleanup_queue(&nullb->queues[i]); | |
429 | ||
430 | kfree(nullb->queues); | |
431 | } | |
432 | ||
f2298c04 JA |
433 | static void null_del_dev(struct nullb *nullb) |
434 | { | |
435 | list_del_init(&nullb->list); | |
436 | ||
b2b7e001 | 437 | if (use_lightnvm) |
54514aa4 MB |
438 | nvm_unregister(nullb->disk_name); |
439 | else | |
440 | del_gendisk(nullb->disk); | |
518d00b7 | 441 | blk_cleanup_queue(nullb->q); |
24d2f903 CH |
442 | if (queue_mode == NULL_Q_MQ) |
443 | blk_mq_free_tag_set(&nullb->tag_set); | |
54514aa4 MB |
444 | if (!use_lightnvm) |
445 | put_disk(nullb->disk); | |
de65d2d2 | 446 | cleanup_queues(nullb); |
f2298c04 JA |
447 | kfree(nullb); |
448 | } | |
449 | ||
b2b7e001 MB |
450 | #ifdef CONFIG_NVM |
451 | ||
452 | static void null_lnvm_end_io(struct request *rq, int error) | |
453 | { | |
454 | struct nvm_rq *rqd = rq->end_io_data; | |
455 | struct nvm_dev *dev = rqd->dev; | |
456 | ||
457 | dev->mt->end_io(rqd, error); | |
458 | ||
459 | blk_put_request(rq); | |
460 | } | |
461 | ||
462 | static int null_lnvm_submit_io(struct request_queue *q, struct nvm_rq *rqd) | |
463 | { | |
464 | struct request *rq; | |
465 | struct bio *bio = rqd->bio; | |
466 | ||
467 | rq = blk_mq_alloc_request(q, bio_rw(bio), GFP_KERNEL, 0); | |
468 | if (IS_ERR(rq)) | |
469 | return -ENOMEM; | |
470 | ||
471 | rq->cmd_type = REQ_TYPE_DRV_PRIV; | |
472 | rq->__sector = bio->bi_iter.bi_sector; | |
473 | rq->ioprio = bio_prio(bio); | |
474 | ||
475 | if (bio_has_data(bio)) | |
476 | rq->nr_phys_segments = bio_phys_segments(q, bio); | |
477 | ||
478 | rq->__data_len = bio->bi_iter.bi_size; | |
479 | rq->bio = rq->biotail = bio; | |
480 | ||
481 | rq->end_io_data = rqd; | |
482 | ||
483 | blk_execute_rq_nowait(q, NULL, rq, 0, null_lnvm_end_io); | |
484 | ||
485 | return 0; | |
486 | } | |
487 | ||
488 | static int null_lnvm_id(struct request_queue *q, struct nvm_id *id) | |
489 | { | |
490 | sector_t size = gb * 1024 * 1024 * 1024ULL; | |
5b40db99 | 491 | sector_t blksize; |
b2b7e001 MB |
492 | struct nvm_id_group *grp; |
493 | ||
494 | id->ver_id = 0x1; | |
495 | id->vmnt = 0; | |
496 | id->cgrps = 1; | |
497 | id->cap = 0x3; | |
498 | id->dom = 0x1; | |
5b40db99 MB |
499 | |
500 | id->ppaf.blk_offset = 0; | |
501 | id->ppaf.blk_len = 16; | |
502 | id->ppaf.pg_offset = 16; | |
503 | id->ppaf.pg_len = 16; | |
504 | id->ppaf.sect_offset = 32; | |
505 | id->ppaf.sect_len = 8; | |
506 | id->ppaf.pln_offset = 40; | |
507 | id->ppaf.pln_len = 8; | |
508 | id->ppaf.lun_offset = 48; | |
509 | id->ppaf.lun_len = 8; | |
510 | id->ppaf.ch_offset = 56; | |
511 | id->ppaf.ch_len = 8; | |
b2b7e001 MB |
512 | |
513 | do_div(size, bs); /* convert size to pages */ | |
5b40db99 | 514 | do_div(size, 256); /* concert size to pgs pr blk */ |
b2b7e001 MB |
515 | grp = &id->groups[0]; |
516 | grp->mtype = 0; | |
5b40db99 | 517 | grp->fmtype = 0; |
b2b7e001 | 518 | grp->num_ch = 1; |
b2b7e001 | 519 | grp->num_pg = 256; |
5b40db99 MB |
520 | blksize = size; |
521 | do_div(size, (1 << 16)); | |
522 | grp->num_lun = size + 1; | |
523 | do_div(blksize, grp->num_lun); | |
524 | grp->num_blk = blksize; | |
525 | grp->num_pln = 1; | |
526 | ||
b2b7e001 MB |
527 | grp->fpg_sz = bs; |
528 | grp->csecs = bs; | |
529 | grp->trdt = 25000; | |
530 | grp->trdm = 25000; | |
531 | grp->tprt = 500000; | |
532 | grp->tprm = 500000; | |
533 | grp->tbet = 1500000; | |
534 | grp->tbem = 1500000; | |
535 | grp->mpos = 0x010101; /* single plane rwe */ | |
536 | grp->cpar = hw_queue_depth; | |
537 | ||
538 | return 0; | |
539 | } | |
540 | ||
541 | static void *null_lnvm_create_dma_pool(struct request_queue *q, char *name) | |
542 | { | |
543 | mempool_t *virtmem_pool; | |
544 | ||
6bb9535b | 545 | virtmem_pool = mempool_create_slab_pool(64, ppa_cache); |
b2b7e001 MB |
546 | if (!virtmem_pool) { |
547 | pr_err("null_blk: Unable to create virtual memory pool\n"); | |
548 | return NULL; | |
549 | } | |
550 | ||
551 | return virtmem_pool; | |
552 | } | |
553 | ||
554 | static void null_lnvm_destroy_dma_pool(void *pool) | |
555 | { | |
556 | mempool_destroy(pool); | |
557 | } | |
558 | ||
559 | static void *null_lnvm_dev_dma_alloc(struct request_queue *q, void *pool, | |
560 | gfp_t mem_flags, dma_addr_t *dma_handler) | |
561 | { | |
562 | return mempool_alloc(pool, mem_flags); | |
563 | } | |
564 | ||
565 | static void null_lnvm_dev_dma_free(void *pool, void *entry, | |
566 | dma_addr_t dma_handler) | |
567 | { | |
568 | mempool_free(entry, pool); | |
569 | } | |
570 | ||
571 | static struct nvm_dev_ops null_lnvm_dev_ops = { | |
572 | .identity = null_lnvm_id, | |
573 | .submit_io = null_lnvm_submit_io, | |
574 | ||
575 | .create_dma_pool = null_lnvm_create_dma_pool, | |
576 | .destroy_dma_pool = null_lnvm_destroy_dma_pool, | |
577 | .dev_dma_alloc = null_lnvm_dev_dma_alloc, | |
578 | .dev_dma_free = null_lnvm_dev_dma_free, | |
579 | ||
580 | /* Simulate nvme protocol restriction */ | |
581 | .max_phys_sect = 64, | |
582 | }; | |
583 | #else | |
584 | static struct nvm_dev_ops null_lnvm_dev_ops; | |
585 | #endif /* CONFIG_NVM */ | |
586 | ||
f2298c04 JA |
587 | static int null_open(struct block_device *bdev, fmode_t mode) |
588 | { | |
589 | return 0; | |
590 | } | |
591 | ||
592 | static void null_release(struct gendisk *disk, fmode_t mode) | |
593 | { | |
594 | } | |
595 | ||
596 | static const struct block_device_operations null_fops = { | |
597 | .owner = THIS_MODULE, | |
598 | .open = null_open, | |
599 | .release = null_release, | |
600 | }; | |
601 | ||
602 | static int setup_commands(struct nullb_queue *nq) | |
603 | { | |
604 | struct nullb_cmd *cmd; | |
605 | int i, tag_size; | |
606 | ||
607 | nq->cmds = kzalloc(nq->queue_depth * sizeof(*cmd), GFP_KERNEL); | |
608 | if (!nq->cmds) | |
2d263a78 | 609 | return -ENOMEM; |
f2298c04 JA |
610 | |
611 | tag_size = ALIGN(nq->queue_depth, BITS_PER_LONG) / BITS_PER_LONG; | |
612 | nq->tag_map = kzalloc(tag_size * sizeof(unsigned long), GFP_KERNEL); | |
613 | if (!nq->tag_map) { | |
614 | kfree(nq->cmds); | |
2d263a78 | 615 | return -ENOMEM; |
f2298c04 JA |
616 | } |
617 | ||
618 | for (i = 0; i < nq->queue_depth; i++) { | |
619 | cmd = &nq->cmds[i]; | |
620 | INIT_LIST_HEAD(&cmd->list); | |
621 | cmd->ll_list.next = NULL; | |
622 | cmd->tag = -1U; | |
623 | } | |
624 | ||
625 | return 0; | |
626 | } | |
627 | ||
f2298c04 JA |
628 | static int setup_queues(struct nullb *nullb) |
629 | { | |
2d263a78 MB |
630 | nullb->queues = kzalloc(submit_queues * sizeof(struct nullb_queue), |
631 | GFP_KERNEL); | |
f2298c04 | 632 | if (!nullb->queues) |
2d263a78 | 633 | return -ENOMEM; |
f2298c04 JA |
634 | |
635 | nullb->nr_queues = 0; | |
636 | nullb->queue_depth = hw_queue_depth; | |
637 | ||
2d263a78 MB |
638 | return 0; |
639 | } | |
640 | ||
641 | static int init_driver_queues(struct nullb *nullb) | |
642 | { | |
643 | struct nullb_queue *nq; | |
644 | int i, ret = 0; | |
f2298c04 JA |
645 | |
646 | for (i = 0; i < submit_queues; i++) { | |
647 | nq = &nullb->queues[i]; | |
2d263a78 MB |
648 | |
649 | null_init_queue(nullb, nq); | |
650 | ||
651 | ret = setup_commands(nq); | |
652 | if (ret) | |
31f9690e | 653 | return ret; |
f2298c04 JA |
654 | nullb->nr_queues++; |
655 | } | |
2d263a78 | 656 | return 0; |
f2298c04 JA |
657 | } |
658 | ||
659 | static int null_add_dev(void) | |
660 | { | |
661 | struct gendisk *disk; | |
662 | struct nullb *nullb; | |
663 | sector_t size; | |
dc501dc0 | 664 | int rv; |
f2298c04 JA |
665 | |
666 | nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, home_node); | |
dc501dc0 RE |
667 | if (!nullb) { |
668 | rv = -ENOMEM; | |
24d2f903 | 669 | goto out; |
dc501dc0 | 670 | } |
f2298c04 JA |
671 | |
672 | spin_lock_init(&nullb->lock); | |
673 | ||
57053d8c MB |
674 | if (queue_mode == NULL_Q_MQ && use_per_node_hctx) |
675 | submit_queues = nr_online_nodes; | |
676 | ||
dc501dc0 RE |
677 | rv = setup_queues(nullb); |
678 | if (rv) | |
24d2f903 | 679 | goto out_free_nullb; |
f2298c04 JA |
680 | |
681 | if (queue_mode == NULL_Q_MQ) { | |
cdef54dd | 682 | nullb->tag_set.ops = &null_mq_ops; |
24d2f903 CH |
683 | nullb->tag_set.nr_hw_queues = submit_queues; |
684 | nullb->tag_set.queue_depth = hw_queue_depth; | |
685 | nullb->tag_set.numa_node = home_node; | |
686 | nullb->tag_set.cmd_size = sizeof(struct nullb_cmd); | |
687 | nullb->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; | |
688 | nullb->tag_set.driver_data = nullb; | |
689 | ||
dc501dc0 RE |
690 | rv = blk_mq_alloc_tag_set(&nullb->tag_set); |
691 | if (rv) | |
24d2f903 CH |
692 | goto out_cleanup_queues; |
693 | ||
694 | nullb->q = blk_mq_init_queue(&nullb->tag_set); | |
35b489d3 | 695 | if (IS_ERR(nullb->q)) { |
dc501dc0 | 696 | rv = -ENOMEM; |
24d2f903 | 697 | goto out_cleanup_tags; |
dc501dc0 | 698 | } |
f2298c04 JA |
699 | } else if (queue_mode == NULL_Q_BIO) { |
700 | nullb->q = blk_alloc_queue_node(GFP_KERNEL, home_node); | |
dc501dc0 RE |
701 | if (!nullb->q) { |
702 | rv = -ENOMEM; | |
24d2f903 | 703 | goto out_cleanup_queues; |
dc501dc0 | 704 | } |
f2298c04 | 705 | blk_queue_make_request(nullb->q, null_queue_bio); |
31f9690e JK |
706 | rv = init_driver_queues(nullb); |
707 | if (rv) | |
708 | goto out_cleanup_blk_queue; | |
f2298c04 JA |
709 | } else { |
710 | nullb->q = blk_init_queue_node(null_request_fn, &nullb->lock, home_node); | |
dc501dc0 RE |
711 | if (!nullb->q) { |
712 | rv = -ENOMEM; | |
24d2f903 | 713 | goto out_cleanup_queues; |
dc501dc0 | 714 | } |
f2298c04 | 715 | blk_queue_prep_rq(nullb->q, null_rq_prep_fn); |
24d2f903 | 716 | blk_queue_softirq_done(nullb->q, null_softirq_done_fn); |
31f9690e JK |
717 | rv = init_driver_queues(nullb); |
718 | if (rv) | |
719 | goto out_cleanup_blk_queue; | |
f2298c04 JA |
720 | } |
721 | ||
f2298c04 JA |
722 | nullb->q->queuedata = nullb; |
723 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, nullb->q); | |
b277da0a | 724 | queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, nullb->q); |
f2298c04 | 725 | |
f2298c04 JA |
726 | |
727 | mutex_lock(&lock); | |
728 | list_add_tail(&nullb->list, &nullb_list); | |
729 | nullb->index = nullb_indexes++; | |
730 | mutex_unlock(&lock); | |
731 | ||
732 | blk_queue_logical_block_size(nullb->q, bs); | |
733 | blk_queue_physical_block_size(nullb->q, bs); | |
734 | ||
b2b7e001 MB |
735 | sprintf(nullb->disk_name, "nullb%d", nullb->index); |
736 | ||
737 | if (use_lightnvm) { | |
738 | rv = nvm_register(nullb->q, nullb->disk_name, | |
739 | &null_lnvm_dev_ops); | |
740 | if (rv) | |
741 | goto out_cleanup_blk_queue; | |
742 | goto done; | |
743 | } | |
744 | ||
745 | disk = nullb->disk = alloc_disk_node(1, home_node); | |
746 | if (!disk) { | |
747 | rv = -ENOMEM; | |
748 | goto out_cleanup_lightnvm; | |
749 | } | |
f2298c04 | 750 | size = gb * 1024 * 1024 * 1024ULL; |
5fdb7e1b | 751 | set_capacity(disk, size >> 9); |
f2298c04 | 752 | |
227290b4 | 753 | disk->flags |= GENHD_FL_EXT_DEVT | GENHD_FL_SUPPRESS_PARTITION_INFO; |
f2298c04 JA |
754 | disk->major = null_major; |
755 | disk->first_minor = nullb->index; | |
756 | disk->fops = &null_fops; | |
757 | disk->private_data = nullb; | |
758 | disk->queue = nullb->q; | |
b2b7e001 MB |
759 | strncpy(disk->disk_name, nullb->disk_name, DISK_NAME_LEN); |
760 | ||
f2298c04 | 761 | add_disk(disk); |
b2b7e001 | 762 | done: |
f2298c04 | 763 | return 0; |
24d2f903 | 764 | |
b2b7e001 MB |
765 | out_cleanup_lightnvm: |
766 | if (use_lightnvm) | |
767 | nvm_unregister(nullb->disk_name); | |
24d2f903 CH |
768 | out_cleanup_blk_queue: |
769 | blk_cleanup_queue(nullb->q); | |
770 | out_cleanup_tags: | |
771 | if (queue_mode == NULL_Q_MQ) | |
772 | blk_mq_free_tag_set(&nullb->tag_set); | |
773 | out_cleanup_queues: | |
774 | cleanup_queues(nullb); | |
775 | out_free_nullb: | |
776 | kfree(nullb); | |
777 | out: | |
dc501dc0 | 778 | return rv; |
f2298c04 JA |
779 | } |
780 | ||
781 | static int __init null_init(void) | |
782 | { | |
783 | unsigned int i; | |
784 | ||
9967d8ac R |
785 | if (bs > PAGE_SIZE) { |
786 | pr_warn("null_blk: invalid block size\n"); | |
787 | pr_warn("null_blk: defaults block size to %lu\n", PAGE_SIZE); | |
788 | bs = PAGE_SIZE; | |
789 | } | |
f2298c04 | 790 | |
6bb9535b MB |
791 | if (use_lightnvm && bs != 4096) { |
792 | pr_warn("null_blk: LightNVM only supports 4k block size\n"); | |
793 | pr_warn("null_blk: defaults block size to 4k\n"); | |
794 | bs = 4096; | |
795 | } | |
796 | ||
b2b7e001 MB |
797 | if (use_lightnvm && queue_mode != NULL_Q_MQ) { |
798 | pr_warn("null_blk: LightNVM only supported for blk-mq\n"); | |
799 | pr_warn("null_blk: defaults queue mode to blk-mq\n"); | |
800 | queue_mode = NULL_Q_MQ; | |
801 | } | |
802 | ||
d15ee6b1 | 803 | if (queue_mode == NULL_Q_MQ && use_per_node_hctx) { |
fc1bc354 | 804 | if (submit_queues < nr_online_nodes) { |
d15ee6b1 MB |
805 | pr_warn("null_blk: submit_queues param is set to %u.", |
806 | nr_online_nodes); | |
fc1bc354 MB |
807 | submit_queues = nr_online_nodes; |
808 | } | |
d15ee6b1 | 809 | } else if (submit_queues > nr_cpu_ids) |
f2298c04 JA |
810 | submit_queues = nr_cpu_ids; |
811 | else if (!submit_queues) | |
812 | submit_queues = 1; | |
813 | ||
814 | mutex_init(&lock); | |
815 | ||
816 | /* Initialize a separate list for each CPU for issuing softirqs */ | |
817 | for_each_possible_cpu(i) { | |
818 | struct completion_queue *cq = &per_cpu(completion_queues, i); | |
819 | ||
820 | init_llist_head(&cq->list); | |
821 | ||
822 | if (irqmode != NULL_IRQ_TIMER) | |
823 | continue; | |
824 | ||
825 | hrtimer_init(&cq->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
826 | cq->timer.function = null_cmd_timer_expired; | |
827 | } | |
828 | ||
829 | null_major = register_blkdev(0, "nullb"); | |
830 | if (null_major < 0) | |
831 | return null_major; | |
832 | ||
6bb9535b MB |
833 | if (use_lightnvm) { |
834 | ppa_cache = kmem_cache_create("ppa_cache", 64 * sizeof(u64), | |
835 | 0, 0, NULL); | |
836 | if (!ppa_cache) { | |
837 | pr_err("null_blk: unable to create ppa cache\n"); | |
838 | return -ENOMEM; | |
839 | } | |
840 | } | |
841 | ||
f2298c04 JA |
842 | for (i = 0; i < nr_devices; i++) { |
843 | if (null_add_dev()) { | |
844 | unregister_blkdev(null_major, "nullb"); | |
6bb9535b | 845 | goto err_ppa; |
f2298c04 JA |
846 | } |
847 | } | |
848 | ||
849 | pr_info("null: module loaded\n"); | |
850 | return 0; | |
6bb9535b MB |
851 | err_ppa: |
852 | kmem_cache_destroy(ppa_cache); | |
853 | return -EINVAL; | |
f2298c04 JA |
854 | } |
855 | ||
856 | static void __exit null_exit(void) | |
857 | { | |
858 | struct nullb *nullb; | |
859 | ||
860 | unregister_blkdev(null_major, "nullb"); | |
861 | ||
862 | mutex_lock(&lock); | |
863 | while (!list_empty(&nullb_list)) { | |
864 | nullb = list_entry(nullb_list.next, struct nullb, list); | |
865 | null_del_dev(nullb); | |
866 | } | |
867 | mutex_unlock(&lock); | |
6bb9535b MB |
868 | |
869 | kmem_cache_destroy(ppa_cache); | |
f2298c04 JA |
870 | } |
871 | ||
872 | module_init(null_init); | |
873 | module_exit(null_exit); | |
874 | ||
875 | MODULE_AUTHOR("Jens Axboe <jaxboe@fusionio.com>"); | |
876 | MODULE_LICENSE("GPL"); |