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x86-64: add system call definitions
[fio.git] / engines / io_uring.c
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CommitLineData
1/*
2 * io_uring engine
3 *
4 * IO engine using the new native Linux aio io_uring interface. See:
5 *
6 * http://git.kernel.dk/cgit/linux-block/log/?h=io_uring
7 *
8 */
9#include <stdlib.h>
10#include <unistd.h>
11#include <errno.h>
12#include <sys/time.h>
13#include <sys/resource.h>
14
15#include "../fio.h"
16#include "../lib/pow2.h"
17#include "../optgroup.h"
18#include "../lib/memalign.h"
19#include "../lib/fls.h"
20#include "../lib/roundup.h"
21
22#ifdef ARCH_HAVE_IOURING
23
24#include "../lib/types.h"
25#include "../os/linux/io_uring.h"
26#include "cmdprio.h"
27
28struct io_sq_ring {
29 unsigned *head;
30 unsigned *tail;
31 unsigned *ring_mask;
32 unsigned *ring_entries;
33 unsigned *flags;
34 unsigned *array;
35};
36
37struct io_cq_ring {
38 unsigned *head;
39 unsigned *tail;
40 unsigned *ring_mask;
41 unsigned *ring_entries;
42 struct io_uring_cqe *cqes;
43};
44
45struct ioring_mmap {
46 void *ptr;
47 size_t len;
48};
49
50struct ioring_data {
51 int ring_fd;
52
53 struct io_u **io_u_index;
54
55 int *fds;
56
57 struct io_sq_ring sq_ring;
58 struct io_uring_sqe *sqes;
59 struct iovec *iovecs;
60 unsigned sq_ring_mask;
61
62 struct io_cq_ring cq_ring;
63 unsigned cq_ring_mask;
64
65 int queued;
66 int cq_ring_off;
67 unsigned iodepth;
68 int prepped;
69
70 struct ioring_mmap mmap[3];
71
72 struct cmdprio cmdprio;
73};
74
75struct ioring_options {
76 struct thread_data *td;
77 unsigned int hipri;
78 struct cmdprio_options cmdprio_options;
79 unsigned int fixedbufs;
80 unsigned int registerfiles;
81 unsigned int sqpoll_thread;
82 unsigned int sqpoll_set;
83 unsigned int sqpoll_cpu;
84 unsigned int nonvectored;
85 unsigned int uncached;
86 unsigned int nowait;
87 unsigned int force_async;
88};
89
90static const int ddir_to_op[2][2] = {
91 { IORING_OP_READV, IORING_OP_READ },
92 { IORING_OP_WRITEV, IORING_OP_WRITE }
93};
94
95static const int fixed_ddir_to_op[2] = {
96 IORING_OP_READ_FIXED,
97 IORING_OP_WRITE_FIXED
98};
99
100static int fio_ioring_sqpoll_cb(void *data, unsigned long long *val)
101{
102 struct ioring_options *o = data;
103
104 o->sqpoll_cpu = *val;
105 o->sqpoll_set = 1;
106 return 0;
107}
108
109static struct fio_option options[] = {
110 {
111 .name = "hipri",
112 .lname = "High Priority",
113 .type = FIO_OPT_STR_SET,
114 .off1 = offsetof(struct ioring_options, hipri),
115 .help = "Use polled IO completions",
116 .category = FIO_OPT_C_ENGINE,
117 .group = FIO_OPT_G_IOURING,
118 },
119#ifdef FIO_HAVE_IOPRIO_CLASS
120 {
121 .name = "cmdprio_percentage",
122 .lname = "high priority percentage",
123 .type = FIO_OPT_INT,
124 .off1 = offsetof(struct ioring_options,
125 cmdprio_options.percentage[DDIR_READ]),
126 .off2 = offsetof(struct ioring_options,
127 cmdprio_options.percentage[DDIR_WRITE]),
128 .minval = 0,
129 .maxval = 100,
130 .help = "Send high priority I/O this percentage of the time",
131 .category = FIO_OPT_C_ENGINE,
132 .group = FIO_OPT_G_IOURING,
133 },
134 {
135 .name = "cmdprio_class",
136 .lname = "Asynchronous I/O priority class",
137 .type = FIO_OPT_INT,
138 .off1 = offsetof(struct ioring_options,
139 cmdprio_options.class[DDIR_READ]),
140 .off2 = offsetof(struct ioring_options,
141 cmdprio_options.class[DDIR_WRITE]),
142 .help = "Set asynchronous IO priority class",
143 .minval = IOPRIO_MIN_PRIO_CLASS + 1,
144 .maxval = IOPRIO_MAX_PRIO_CLASS,
145 .interval = 1,
146 .category = FIO_OPT_C_ENGINE,
147 .group = FIO_OPT_G_IOURING,
148 },
149 {
150 .name = "cmdprio",
151 .lname = "Asynchronous I/O priority level",
152 .type = FIO_OPT_INT,
153 .off1 = offsetof(struct ioring_options,
154 cmdprio_options.level[DDIR_READ]),
155 .off2 = offsetof(struct ioring_options,
156 cmdprio_options.level[DDIR_WRITE]),
157 .help = "Set asynchronous IO priority level",
158 .minval = IOPRIO_MIN_PRIO,
159 .maxval = IOPRIO_MAX_PRIO,
160 .interval = 1,
161 .category = FIO_OPT_C_ENGINE,
162 .group = FIO_OPT_G_IOURING,
163 },
164 {
165 .name = "cmdprio_bssplit",
166 .lname = "Priority percentage block size split",
167 .type = FIO_OPT_STR_STORE,
168 .off1 = offsetof(struct ioring_options,
169 cmdprio_options.bssplit_str),
170 .help = "Set priority percentages for different block sizes",
171 .category = FIO_OPT_C_ENGINE,
172 .group = FIO_OPT_G_IOURING,
173 },
174#else
175 {
176 .name = "cmdprio_percentage",
177 .lname = "high priority percentage",
178 .type = FIO_OPT_UNSUPPORTED,
179 .help = "Your platform does not support I/O priority classes",
180 },
181 {
182 .name = "cmdprio_class",
183 .lname = "Asynchronous I/O priority class",
184 .type = FIO_OPT_UNSUPPORTED,
185 .help = "Your platform does not support I/O priority classes",
186 },
187 {
188 .name = "cmdprio",
189 .lname = "Asynchronous I/O priority level",
190 .type = FIO_OPT_UNSUPPORTED,
191 .help = "Your platform does not support I/O priority classes",
192 },
193 {
194 .name = "cmdprio_bssplit",
195 .lname = "Priority percentage block size split",
196 .type = FIO_OPT_UNSUPPORTED,
197 .help = "Your platform does not support I/O priority classes",
198 },
199#endif
200 {
201 .name = "fixedbufs",
202 .lname = "Fixed (pre-mapped) IO buffers",
203 .type = FIO_OPT_STR_SET,
204 .off1 = offsetof(struct ioring_options, fixedbufs),
205 .help = "Pre map IO buffers",
206 .category = FIO_OPT_C_ENGINE,
207 .group = FIO_OPT_G_IOURING,
208 },
209 {
210 .name = "registerfiles",
211 .lname = "Register file set",
212 .type = FIO_OPT_STR_SET,
213 .off1 = offsetof(struct ioring_options, registerfiles),
214 .help = "Pre-open/register files",
215 .category = FIO_OPT_C_ENGINE,
216 .group = FIO_OPT_G_IOURING,
217 },
218 {
219 .name = "sqthread_poll",
220 .lname = "Kernel SQ thread polling",
221 .type = FIO_OPT_INT,
222 .off1 = offsetof(struct ioring_options, sqpoll_thread),
223 .help = "Offload submission/completion to kernel thread",
224 .category = FIO_OPT_C_ENGINE,
225 .group = FIO_OPT_G_IOURING,
226 },
227 {
228 .name = "sqthread_poll_cpu",
229 .lname = "SQ Thread Poll CPU",
230 .type = FIO_OPT_INT,
231 .cb = fio_ioring_sqpoll_cb,
232 .help = "What CPU to run SQ thread polling on",
233 .category = FIO_OPT_C_ENGINE,
234 .group = FIO_OPT_G_IOURING,
235 },
236 {
237 .name = "nonvectored",
238 .lname = "Non-vectored",
239 .type = FIO_OPT_INT,
240 .off1 = offsetof(struct ioring_options, nonvectored),
241 .def = "-1",
242 .help = "Use non-vectored read/write commands",
243 .category = FIO_OPT_C_ENGINE,
244 .group = FIO_OPT_G_IOURING,
245 },
246 {
247 .name = "uncached",
248 .lname = "Uncached",
249 .type = FIO_OPT_INT,
250 .off1 = offsetof(struct ioring_options, uncached),
251 .help = "Use RWF_UNCACHED for buffered read/writes",
252 .category = FIO_OPT_C_ENGINE,
253 .group = FIO_OPT_G_IOURING,
254 },
255 {
256 .name = "nowait",
257 .lname = "RWF_NOWAIT",
258 .type = FIO_OPT_BOOL,
259 .off1 = offsetof(struct ioring_options, nowait),
260 .help = "Use RWF_NOWAIT for reads/writes",
261 .category = FIO_OPT_C_ENGINE,
262 .group = FIO_OPT_G_IOURING,
263 },
264 {
265 .name = "force_async",
266 .lname = "Force async",
267 .type = FIO_OPT_INT,
268 .off1 = offsetof(struct ioring_options, force_async),
269 .help = "Set IOSQE_ASYNC every N requests",
270 .category = FIO_OPT_C_ENGINE,
271 .group = FIO_OPT_G_IOURING,
272 },
273 {
274 .name = NULL,
275 },
276};
277
278static int io_uring_enter(struct ioring_data *ld, unsigned int to_submit,
279 unsigned int min_complete, unsigned int flags)
280{
281 return syscall(__NR_io_uring_enter, ld->ring_fd, to_submit,
282 min_complete, flags, NULL, 0);
283}
284
285static int fio_ioring_prep(struct thread_data *td, struct io_u *io_u)
286{
287 struct ioring_data *ld = td->io_ops_data;
288 struct ioring_options *o = td->eo;
289 struct fio_file *f = io_u->file;
290 struct io_uring_sqe *sqe;
291
292 sqe = &ld->sqes[io_u->index];
293
294 if (o->registerfiles) {
295 sqe->fd = f->engine_pos;
296 sqe->flags = IOSQE_FIXED_FILE;
297 } else {
298 sqe->fd = f->fd;
299 sqe->flags = 0;
300 }
301
302 if (io_u->ddir == DDIR_READ || io_u->ddir == DDIR_WRITE) {
303 if (o->fixedbufs) {
304 sqe->opcode = fixed_ddir_to_op[io_u->ddir];
305 sqe->addr = (unsigned long) io_u->xfer_buf;
306 sqe->len = io_u->xfer_buflen;
307 sqe->buf_index = io_u->index;
308 } else {
309 struct iovec *iov = &ld->iovecs[io_u->index];
310
311 /*
312 * Update based on actual io_u, requeue could have
313 * adjusted these
314 */
315 iov->iov_base = io_u->xfer_buf;
316 iov->iov_len = io_u->xfer_buflen;
317
318 sqe->opcode = ddir_to_op[io_u->ddir][!!o->nonvectored];
319 if (o->nonvectored) {
320 sqe->addr = (unsigned long) iov->iov_base;
321 sqe->len = iov->iov_len;
322 } else {
323 sqe->addr = (unsigned long) iov;
324 sqe->len = 1;
325 }
326 }
327 sqe->rw_flags = 0;
328 if (!td->o.odirect && o->uncached)
329 sqe->rw_flags |= RWF_UNCACHED;
330 if (o->nowait)
331 sqe->rw_flags |= RWF_NOWAIT;
332
333 /*
334 * Since io_uring can have a submission context (sqthread_poll)
335 * that is different from the process context, we cannot rely on
336 * the IO priority set by ioprio_set() (option prio/prioclass)
337 * to be inherited.
338 * td->ioprio will have the value of the "default prio", so set
339 * this unconditionally. This value might get overridden by
340 * fio_ioring_cmdprio_prep() if the option cmdprio_percentage or
341 * cmdprio_bssplit is used.
342 */
343 sqe->ioprio = td->ioprio;
344 sqe->off = io_u->offset;
345 } else if (ddir_sync(io_u->ddir)) {
346 sqe->ioprio = 0;
347 if (io_u->ddir == DDIR_SYNC_FILE_RANGE) {
348 sqe->off = f->first_write;
349 sqe->len = f->last_write - f->first_write;
350 sqe->sync_range_flags = td->o.sync_file_range;
351 sqe->opcode = IORING_OP_SYNC_FILE_RANGE;
352 } else {
353 sqe->off = 0;
354 sqe->addr = 0;
355 sqe->len = 0;
356 if (io_u->ddir == DDIR_DATASYNC)
357 sqe->fsync_flags |= IORING_FSYNC_DATASYNC;
358 sqe->opcode = IORING_OP_FSYNC;
359 }
360 }
361
362 if (o->force_async && ++ld->prepped == o->force_async) {
363 ld->prepped = 0;
364 sqe->flags |= IOSQE_ASYNC;
365 }
366
367 sqe->user_data = (unsigned long) io_u;
368 return 0;
369}
370
371static struct io_u *fio_ioring_event(struct thread_data *td, int event)
372{
373 struct ioring_data *ld = td->io_ops_data;
374 struct io_uring_cqe *cqe;
375 struct io_u *io_u;
376 unsigned index;
377
378 index = (event + ld->cq_ring_off) & ld->cq_ring_mask;
379
380 cqe = &ld->cq_ring.cqes[index];
381 io_u = (struct io_u *) (uintptr_t) cqe->user_data;
382
383 if (cqe->res != io_u->xfer_buflen) {
384 if (cqe->res > io_u->xfer_buflen)
385 io_u->error = -cqe->res;
386 else
387 io_u->resid = io_u->xfer_buflen - cqe->res;
388 } else
389 io_u->error = 0;
390
391 return io_u;
392}
393
394static int fio_ioring_cqring_reap(struct thread_data *td, unsigned int events,
395 unsigned int max)
396{
397 struct ioring_data *ld = td->io_ops_data;
398 struct io_cq_ring *ring = &ld->cq_ring;
399 unsigned head, reaped = 0;
400
401 head = *ring->head;
402 do {
403 if (head == atomic_load_acquire(ring->tail))
404 break;
405 reaped++;
406 head++;
407 } while (reaped + events < max);
408
409 if (reaped)
410 atomic_store_release(ring->head, head);
411
412 return reaped;
413}
414
415static int fio_ioring_getevents(struct thread_data *td, unsigned int min,
416 unsigned int max, const struct timespec *t)
417{
418 struct ioring_data *ld = td->io_ops_data;
419 unsigned actual_min = td->o.iodepth_batch_complete_min == 0 ? 0 : min;
420 struct ioring_options *o = td->eo;
421 struct io_cq_ring *ring = &ld->cq_ring;
422 unsigned events = 0;
423 int r;
424
425 ld->cq_ring_off = *ring->head;
426 do {
427 r = fio_ioring_cqring_reap(td, events, max);
428 if (r) {
429 events += r;
430 if (actual_min != 0)
431 actual_min -= r;
432 continue;
433 }
434
435 if (!o->sqpoll_thread) {
436 r = io_uring_enter(ld, 0, actual_min,
437 IORING_ENTER_GETEVENTS);
438 if (r < 0) {
439 if (errno == EAGAIN || errno == EINTR)
440 continue;
441 td_verror(td, errno, "io_uring_enter");
442 break;
443 }
444 }
445 } while (events < min);
446
447 return r < 0 ? r : events;
448}
449
450static inline void fio_ioring_cmdprio_prep(struct thread_data *td,
451 struct io_u *io_u)
452{
453 struct ioring_data *ld = td->io_ops_data;
454 struct cmdprio *cmdprio = &ld->cmdprio;
455
456 if (fio_cmdprio_set_ioprio(td, cmdprio, io_u))
457 ld->sqes[io_u->index].ioprio = io_u->ioprio;
458}
459
460static enum fio_q_status fio_ioring_queue(struct thread_data *td,
461 struct io_u *io_u)
462{
463 struct ioring_data *ld = td->io_ops_data;
464 struct io_sq_ring *ring = &ld->sq_ring;
465 unsigned tail, next_tail;
466
467 fio_ro_check(td, io_u);
468
469 if (ld->queued == ld->iodepth)
470 return FIO_Q_BUSY;
471
472 if (io_u->ddir == DDIR_TRIM) {
473 if (ld->queued)
474 return FIO_Q_BUSY;
475
476 do_io_u_trim(td, io_u);
477 io_u_mark_submit(td, 1);
478 io_u_mark_complete(td, 1);
479 return FIO_Q_COMPLETED;
480 }
481
482 tail = *ring->tail;
483 next_tail = tail + 1;
484 if (next_tail == atomic_load_acquire(ring->head))
485 return FIO_Q_BUSY;
486
487 if (ld->cmdprio.mode != CMDPRIO_MODE_NONE)
488 fio_ioring_cmdprio_prep(td, io_u);
489
490 ring->array[tail & ld->sq_ring_mask] = io_u->index;
491 atomic_store_release(ring->tail, next_tail);
492
493 ld->queued++;
494 return FIO_Q_QUEUED;
495}
496
497static void fio_ioring_queued(struct thread_data *td, int start, int nr)
498{
499 struct ioring_data *ld = td->io_ops_data;
500 struct timespec now;
501
502 if (!fio_fill_issue_time(td))
503 return;
504
505 fio_gettime(&now, NULL);
506
507 while (nr--) {
508 struct io_sq_ring *ring = &ld->sq_ring;
509 int index = ring->array[start & ld->sq_ring_mask];
510 struct io_u *io_u = ld->io_u_index[index];
511
512 memcpy(&io_u->issue_time, &now, sizeof(now));
513 io_u_queued(td, io_u);
514
515 start++;
516 }
517}
518
519static int fio_ioring_commit(struct thread_data *td)
520{
521 struct ioring_data *ld = td->io_ops_data;
522 struct ioring_options *o = td->eo;
523 int ret;
524
525 if (!ld->queued)
526 return 0;
527
528 /*
529 * Kernel side does submission. just need to check if the ring is
530 * flagged as needing a kick, if so, call io_uring_enter(). This
531 * only happens if we've been idle too long.
532 */
533 if (o->sqpoll_thread) {
534 struct io_sq_ring *ring = &ld->sq_ring;
535 unsigned flags;
536
537 flags = atomic_load_acquire(ring->flags);
538 if (flags & IORING_SQ_NEED_WAKEUP)
539 io_uring_enter(ld, ld->queued, 0,
540 IORING_ENTER_SQ_WAKEUP);
541 ld->queued = 0;
542 return 0;
543 }
544
545 do {
546 unsigned start = *ld->sq_ring.head;
547 long nr = ld->queued;
548
549 ret = io_uring_enter(ld, nr, 0, IORING_ENTER_GETEVENTS);
550 if (ret > 0) {
551 fio_ioring_queued(td, start, ret);
552 io_u_mark_submit(td, ret);
553
554 ld->queued -= ret;
555 ret = 0;
556 } else if (!ret) {
557 io_u_mark_submit(td, ret);
558 continue;
559 } else {
560 if (errno == EAGAIN || errno == EINTR) {
561 ret = fio_ioring_cqring_reap(td, 0, ld->queued);
562 if (ret)
563 continue;
564 /* Shouldn't happen */
565 usleep(1);
566 continue;
567 }
568 td_verror(td, errno, "io_uring_enter submit");
569 break;
570 }
571 } while (ld->queued);
572
573 return ret;
574}
575
576static void fio_ioring_unmap(struct ioring_data *ld)
577{
578 int i;
579
580 for (i = 0; i < FIO_ARRAY_SIZE(ld->mmap); i++)
581 munmap(ld->mmap[i].ptr, ld->mmap[i].len);
582 close(ld->ring_fd);
583}
584
585static void fio_ioring_cleanup(struct thread_data *td)
586{
587 struct ioring_data *ld = td->io_ops_data;
588
589 if (ld) {
590 if (!(td->flags & TD_F_CHILD))
591 fio_ioring_unmap(ld);
592
593 fio_cmdprio_cleanup(&ld->cmdprio);
594 free(ld->io_u_index);
595 free(ld->iovecs);
596 free(ld->fds);
597 free(ld);
598 }
599}
600
601static int fio_ioring_mmap(struct ioring_data *ld, struct io_uring_params *p)
602{
603 struct io_sq_ring *sring = &ld->sq_ring;
604 struct io_cq_ring *cring = &ld->cq_ring;
605 void *ptr;
606
607 ld->mmap[0].len = p->sq_off.array + p->sq_entries * sizeof(__u32);
608 ptr = mmap(0, ld->mmap[0].len, PROT_READ | PROT_WRITE,
609 MAP_SHARED | MAP_POPULATE, ld->ring_fd,
610 IORING_OFF_SQ_RING);
611 ld->mmap[0].ptr = ptr;
612 sring->head = ptr + p->sq_off.head;
613 sring->tail = ptr + p->sq_off.tail;
614 sring->ring_mask = ptr + p->sq_off.ring_mask;
615 sring->ring_entries = ptr + p->sq_off.ring_entries;
616 sring->flags = ptr + p->sq_off.flags;
617 sring->array = ptr + p->sq_off.array;
618 ld->sq_ring_mask = *sring->ring_mask;
619
620 ld->mmap[1].len = p->sq_entries * sizeof(struct io_uring_sqe);
621 ld->sqes = mmap(0, ld->mmap[1].len, PROT_READ | PROT_WRITE,
622 MAP_SHARED | MAP_POPULATE, ld->ring_fd,
623 IORING_OFF_SQES);
624 ld->mmap[1].ptr = ld->sqes;
625
626 ld->mmap[2].len = p->cq_off.cqes +
627 p->cq_entries * sizeof(struct io_uring_cqe);
628 ptr = mmap(0, ld->mmap[2].len, PROT_READ | PROT_WRITE,
629 MAP_SHARED | MAP_POPULATE, ld->ring_fd,
630 IORING_OFF_CQ_RING);
631 ld->mmap[2].ptr = ptr;
632 cring->head = ptr + p->cq_off.head;
633 cring->tail = ptr + p->cq_off.tail;
634 cring->ring_mask = ptr + p->cq_off.ring_mask;
635 cring->ring_entries = ptr + p->cq_off.ring_entries;
636 cring->cqes = ptr + p->cq_off.cqes;
637 ld->cq_ring_mask = *cring->ring_mask;
638 return 0;
639}
640
641static void fio_ioring_probe(struct thread_data *td)
642{
643 struct ioring_data *ld = td->io_ops_data;
644 struct ioring_options *o = td->eo;
645 struct io_uring_probe *p;
646 int ret;
647
648 /* already set by user, don't touch */
649 if (o->nonvectored != -1)
650 return;
651
652 /* default to off, as that's always safe */
653 o->nonvectored = 0;
654
655 p = malloc(sizeof(*p) + 256 * sizeof(struct io_uring_probe_op));
656 if (!p)
657 return;
658
659 memset(p, 0, sizeof(*p) + 256 * sizeof(struct io_uring_probe_op));
660 ret = syscall(__NR_io_uring_register, ld->ring_fd,
661 IORING_REGISTER_PROBE, p, 256);
662 if (ret < 0)
663 goto out;
664
665 if (IORING_OP_WRITE > p->ops_len)
666 goto out;
667
668 if ((p->ops[IORING_OP_READ].flags & IO_URING_OP_SUPPORTED) &&
669 (p->ops[IORING_OP_WRITE].flags & IO_URING_OP_SUPPORTED))
670 o->nonvectored = 1;
671out:
672 free(p);
673}
674
675static int fio_ioring_queue_init(struct thread_data *td)
676{
677 struct ioring_data *ld = td->io_ops_data;
678 struct ioring_options *o = td->eo;
679 int depth = td->o.iodepth;
680 struct io_uring_params p;
681 int ret;
682
683 memset(&p, 0, sizeof(p));
684
685 if (o->hipri)
686 p.flags |= IORING_SETUP_IOPOLL;
687 if (o->sqpoll_thread) {
688 p.flags |= IORING_SETUP_SQPOLL;
689 if (o->sqpoll_set) {
690 p.flags |= IORING_SETUP_SQ_AFF;
691 p.sq_thread_cpu = o->sqpoll_cpu;
692 }
693 }
694
695 /*
696 * Clamp CQ ring size at our SQ ring size, we don't need more entries
697 * than that.
698 */
699 p.flags |= IORING_SETUP_CQSIZE;
700 p.cq_entries = depth;
701
702retry:
703 ret = syscall(__NR_io_uring_setup, depth, &p);
704 if (ret < 0) {
705 if (errno == EINVAL && p.flags & IORING_SETUP_CQSIZE) {
706 p.flags &= ~IORING_SETUP_CQSIZE;
707 goto retry;
708 }
709 return ret;
710 }
711
712 ld->ring_fd = ret;
713
714 fio_ioring_probe(td);
715
716 if (o->fixedbufs) {
717 ret = syscall(__NR_io_uring_register, ld->ring_fd,
718 IORING_REGISTER_BUFFERS, ld->iovecs, depth);
719 if (ret < 0)
720 return ret;
721 }
722
723 return fio_ioring_mmap(ld, &p);
724}
725
726static int fio_ioring_register_files(struct thread_data *td)
727{
728 struct ioring_data *ld = td->io_ops_data;
729 struct fio_file *f;
730 unsigned int i;
731 int ret;
732
733 ld->fds = calloc(td->o.nr_files, sizeof(int));
734
735 for_each_file(td, f, i) {
736 ret = generic_open_file(td, f);
737 if (ret)
738 goto err;
739 ld->fds[i] = f->fd;
740 f->engine_pos = i;
741 }
742
743 ret = syscall(__NR_io_uring_register, ld->ring_fd,
744 IORING_REGISTER_FILES, ld->fds, td->o.nr_files);
745 if (ret) {
746err:
747 free(ld->fds);
748 ld->fds = NULL;
749 }
750
751 /*
752 * Pretend the file is closed again, and really close it if we hit
753 * an error.
754 */
755 for_each_file(td, f, i) {
756 if (ret) {
757 int fio_unused ret2;
758 ret2 = generic_close_file(td, f);
759 } else
760 f->fd = -1;
761 }
762
763 return ret;
764}
765
766static int fio_ioring_post_init(struct thread_data *td)
767{
768 struct ioring_data *ld = td->io_ops_data;
769 struct ioring_options *o = td->eo;
770 struct io_u *io_u;
771 int err, i;
772
773 for (i = 0; i < td->o.iodepth; i++) {
774 struct iovec *iov = &ld->iovecs[i];
775
776 io_u = ld->io_u_index[i];
777 iov->iov_base = io_u->buf;
778 iov->iov_len = td_max_bs(td);
779 }
780
781 err = fio_ioring_queue_init(td);
782 if (err) {
783 int init_err = errno;
784
785 if (init_err == ENOSYS)
786 log_err("fio: your kernel doesn't support io_uring\n");
787 td_verror(td, init_err, "io_queue_init");
788 return 1;
789 }
790
791 for (i = 0; i < td->o.iodepth; i++) {
792 struct io_uring_sqe *sqe;
793
794 sqe = &ld->sqes[i];
795 memset(sqe, 0, sizeof(*sqe));
796 }
797
798 if (o->registerfiles) {
799 err = fio_ioring_register_files(td);
800 if (err) {
801 td_verror(td, errno, "ioring_register_files");
802 return 1;
803 }
804 }
805
806 return 0;
807}
808
809static int fio_ioring_init(struct thread_data *td)
810{
811 struct ioring_options *o = td->eo;
812 struct ioring_data *ld;
813 int ret;
814
815 /* sqthread submission requires registered files */
816 if (o->sqpoll_thread)
817 o->registerfiles = 1;
818
819 if (o->registerfiles && td->o.nr_files != td->o.open_files) {
820 log_err("fio: io_uring registered files require nr_files to "
821 "be identical to open_files\n");
822 return 1;
823 }
824
825 ld = calloc(1, sizeof(*ld));
826
827 /* ring depth must be a power-of-2 */
828 ld->iodepth = td->o.iodepth;
829 td->o.iodepth = roundup_pow2(td->o.iodepth);
830
831 /* io_u index */
832 ld->io_u_index = calloc(td->o.iodepth, sizeof(struct io_u *));
833 ld->iovecs = calloc(td->o.iodepth, sizeof(struct iovec));
834
835 td->io_ops_data = ld;
836
837 ret = fio_cmdprio_init(td, &ld->cmdprio, &o->cmdprio_options);
838 if (ret) {
839 td_verror(td, EINVAL, "fio_ioring_init");
840 return 1;
841 }
842
843 return 0;
844}
845
846static int fio_ioring_io_u_init(struct thread_data *td, struct io_u *io_u)
847{
848 struct ioring_data *ld = td->io_ops_data;
849
850 ld->io_u_index[io_u->index] = io_u;
851 return 0;
852}
853
854static int fio_ioring_open_file(struct thread_data *td, struct fio_file *f)
855{
856 struct ioring_data *ld = td->io_ops_data;
857 struct ioring_options *o = td->eo;
858
859 if (!ld || !o->registerfiles)
860 return generic_open_file(td, f);
861
862 f->fd = ld->fds[f->engine_pos];
863 return 0;
864}
865
866static int fio_ioring_close_file(struct thread_data *td, struct fio_file *f)
867{
868 struct ioring_data *ld = td->io_ops_data;
869 struct ioring_options *o = td->eo;
870
871 if (!ld || !o->registerfiles)
872 return generic_close_file(td, f);
873
874 f->fd = -1;
875 return 0;
876}
877
878static struct ioengine_ops ioengine = {
879 .name = "io_uring",
880 .version = FIO_IOOPS_VERSION,
881 .flags = FIO_ASYNCIO_SYNC_TRIM | FIO_NO_OFFLOAD,
882 .init = fio_ioring_init,
883 .post_init = fio_ioring_post_init,
884 .io_u_init = fio_ioring_io_u_init,
885 .prep = fio_ioring_prep,
886 .queue = fio_ioring_queue,
887 .commit = fio_ioring_commit,
888 .getevents = fio_ioring_getevents,
889 .event = fio_ioring_event,
890 .cleanup = fio_ioring_cleanup,
891 .open_file = fio_ioring_open_file,
892 .close_file = fio_ioring_close_file,
893 .get_file_size = generic_get_file_size,
894 .options = options,
895 .option_struct_size = sizeof(struct ioring_options),
896};
897
898static void fio_init fio_ioring_register(void)
899{
900 register_ioengine(&ioengine);
901}
902
903static void fio_exit fio_ioring_unregister(void)
904{
905 unregister_ioengine(&ioengine);
906}
907#endif
fio - Flexible IO Tester