4 * IO engine using the new native Linux aio io_uring interface. See:
6 * http://git.kernel.dk/cgit/linux-block/log/?h=io_uring
13 #include <sys/resource.h>
16 #include "../lib/pow2.h"
17 #include "../optgroup.h"
18 #include "../lib/memalign.h"
19 #include "../lib/fls.h"
21 #ifdef ARCH_HAVE_IOURING
23 #include "../lib/types.h"
24 #include "../os/linux/io_uring.h"
30 unsigned *ring_entries;
39 unsigned *ring_entries;
40 struct io_uring_cqe *cqes;
51 struct io_u **io_u_index;
55 struct io_sq_ring sq_ring;
56 struct io_uring_sqe *sqes;
58 unsigned sq_ring_mask;
60 struct io_cq_ring cq_ring;
61 unsigned cq_ring_mask;
67 struct ioring_mmap mmap[3];
70 struct ioring_options {
73 unsigned int cmdprio_percentage;
74 unsigned int fixedbufs;
75 unsigned int registerfiles;
76 unsigned int sqpoll_thread;
77 unsigned int sqpoll_set;
78 unsigned int sqpoll_cpu;
79 unsigned int nonvectored;
80 unsigned int uncached;
83 static const int ddir_to_op[2][2] = {
84 { IORING_OP_READV, IORING_OP_READ },
85 { IORING_OP_WRITEV, IORING_OP_WRITE }
88 static const int fixed_ddir_to_op[2] = {
93 static int fio_ioring_sqpoll_cb(void *data, unsigned long long *val)
95 struct ioring_options *o = data;
102 static struct fio_option options[] = {
105 .lname = "High Priority",
106 .type = FIO_OPT_STR_SET,
107 .off1 = offsetof(struct ioring_options, hipri),
108 .help = "Use polled IO completions",
109 .category = FIO_OPT_C_ENGINE,
110 .group = FIO_OPT_G_IOURING,
112 #ifdef FIO_HAVE_IOPRIO_CLASS
114 .name = "cmdprio_percentage",
115 .lname = "high priority percentage",
117 .off1 = offsetof(struct ioring_options, cmdprio_percentage),
120 .help = "Send high priority I/O this percentage of the time",
121 .category = FIO_OPT_C_ENGINE,
122 .group = FIO_OPT_G_IOURING,
126 .name = "cmdprio_percentage",
127 .lname = "high priority percentage",
128 .type = FIO_OPT_UNSUPPORTED,
129 .help = "Your platform does not support I/O priority classes",
134 .lname = "Fixed (pre-mapped) IO buffers",
135 .type = FIO_OPT_STR_SET,
136 .off1 = offsetof(struct ioring_options, fixedbufs),
137 .help = "Pre map IO buffers",
138 .category = FIO_OPT_C_ENGINE,
139 .group = FIO_OPT_G_IOURING,
142 .name = "registerfiles",
143 .lname = "Register file set",
144 .type = FIO_OPT_STR_SET,
145 .off1 = offsetof(struct ioring_options, registerfiles),
146 .help = "Pre-open/register files",
147 .category = FIO_OPT_C_ENGINE,
148 .group = FIO_OPT_G_IOURING,
151 .name = "sqthread_poll",
152 .lname = "Kernel SQ thread polling",
154 .off1 = offsetof(struct ioring_options, sqpoll_thread),
155 .help = "Offload submission/completion to kernel thread",
156 .category = FIO_OPT_C_ENGINE,
157 .group = FIO_OPT_G_IOURING,
160 .name = "sqthread_poll_cpu",
161 .lname = "SQ Thread Poll CPU",
163 .cb = fio_ioring_sqpoll_cb,
164 .help = "What CPU to run SQ thread polling on",
165 .category = FIO_OPT_C_ENGINE,
166 .group = FIO_OPT_G_IOURING,
169 .name = "nonvectored",
170 .lname = "Non-vectored",
172 .off1 = offsetof(struct ioring_options, nonvectored),
173 .help = "Use non-vectored read/write commands",
174 .category = FIO_OPT_C_ENGINE,
175 .group = FIO_OPT_G_IOURING,
181 .off1 = offsetof(struct ioring_options, uncached),
182 .help = "Use RWF_UNCACHED for buffered read/writes",
183 .category = FIO_OPT_C_ENGINE,
184 .group = FIO_OPT_G_IOURING,
191 static int io_uring_enter(struct ioring_data *ld, unsigned int to_submit,
192 unsigned int min_complete, unsigned int flags)
194 return syscall(__NR_io_uring_enter, ld->ring_fd, to_submit,
195 min_complete, flags, NULL, 0);
198 static int fio_ioring_prep(struct thread_data *td, struct io_u *io_u)
200 struct ioring_data *ld = td->io_ops_data;
201 struct ioring_options *o = td->eo;
202 struct fio_file *f = io_u->file;
203 struct io_uring_sqe *sqe;
205 sqe = &ld->sqes[io_u->index];
207 /* zero out fields not used in this submission */
208 memset(sqe, 0, sizeof(*sqe));
210 if (o->registerfiles) {
211 sqe->fd = f->engine_pos;
212 sqe->flags = IOSQE_FIXED_FILE;
217 if (io_u->ddir == DDIR_READ || io_u->ddir == DDIR_WRITE) {
219 sqe->opcode = fixed_ddir_to_op[io_u->ddir];
220 sqe->addr = (unsigned long) io_u->xfer_buf;
221 sqe->len = io_u->xfer_buflen;
222 sqe->buf_index = io_u->index;
224 sqe->opcode = ddir_to_op[io_u->ddir][!!o->nonvectored];
225 if (o->nonvectored) {
226 sqe->addr = (unsigned long)
227 ld->iovecs[io_u->index].iov_base;
228 sqe->len = ld->iovecs[io_u->index].iov_len;
230 sqe->addr = (unsigned long) &ld->iovecs[io_u->index];
234 if (!td->o.odirect && o->uncached)
235 sqe->rw_flags = RWF_UNCACHED;
236 if (fio_option_is_set(&td->o, ioprio_class))
237 sqe->ioprio = td->o.ioprio_class << 13;
238 if (fio_option_is_set(&td->o, ioprio))
239 sqe->ioprio |= td->o.ioprio;
240 sqe->off = io_u->offset;
241 } else if (ddir_sync(io_u->ddir)) {
242 if (io_u->ddir == DDIR_SYNC_FILE_RANGE) {
243 sqe->off = f->first_write;
244 sqe->len = f->last_write - f->first_write;
245 sqe->sync_range_flags = td->o.sync_file_range;
246 sqe->opcode = IORING_OP_SYNC_FILE_RANGE;
248 if (io_u->ddir == DDIR_DATASYNC)
249 sqe->fsync_flags |= IORING_FSYNC_DATASYNC;
250 sqe->opcode = IORING_OP_FSYNC;
254 sqe->user_data = (unsigned long) io_u;
258 static struct io_u *fio_ioring_event(struct thread_data *td, int event)
260 struct ioring_data *ld = td->io_ops_data;
261 struct io_uring_cqe *cqe;
265 index = (event + ld->cq_ring_off) & ld->cq_ring_mask;
267 cqe = &ld->cq_ring.cqes[index];
268 io_u = (struct io_u *) (uintptr_t) cqe->user_data;
270 if (cqe->res != io_u->xfer_buflen) {
271 if (cqe->res > io_u->xfer_buflen)
272 io_u->error = -cqe->res;
274 io_u->resid = io_u->xfer_buflen - cqe->res;
281 static int fio_ioring_cqring_reap(struct thread_data *td, unsigned int events,
284 struct ioring_data *ld = td->io_ops_data;
285 struct io_cq_ring *ring = &ld->cq_ring;
286 unsigned head, reaped = 0;
291 if (head == *ring->tail)
295 } while (reaped + events < max);
302 static int fio_ioring_getevents(struct thread_data *td, unsigned int min,
303 unsigned int max, const struct timespec *t)
305 struct ioring_data *ld = td->io_ops_data;
306 unsigned actual_min = td->o.iodepth_batch_complete_min == 0 ? 0 : min;
307 struct ioring_options *o = td->eo;
308 struct io_cq_ring *ring = &ld->cq_ring;
312 ld->cq_ring_off = *ring->head;
314 r = fio_ioring_cqring_reap(td, events, max);
322 if (!o->sqpoll_thread) {
323 r = io_uring_enter(ld, 0, actual_min,
324 IORING_ENTER_GETEVENTS);
326 if (errno == EAGAIN || errno == EINTR)
328 td_verror(td, errno, "io_uring_enter");
332 } while (events < min);
334 return r < 0 ? r : events;
337 static void fio_ioring_prio_prep(struct thread_data *td, struct io_u *io_u)
339 struct ioring_options *o = td->eo;
340 struct ioring_data *ld = td->io_ops_data;
341 if (rand_between(&td->prio_state, 0, 99) < o->cmdprio_percentage) {
342 ld->sqes[io_u->index].ioprio = IOPRIO_CLASS_RT << IOPRIO_CLASS_SHIFT;
343 io_u->flags |= IO_U_F_PRIORITY;
348 static enum fio_q_status fio_ioring_queue(struct thread_data *td,
351 struct ioring_data *ld = td->io_ops_data;
352 struct io_sq_ring *ring = &ld->sq_ring;
353 struct ioring_options *o = td->eo;
354 unsigned tail, next_tail;
356 fio_ro_check(td, io_u);
358 if (ld->queued == ld->iodepth)
361 if (io_u->ddir == DDIR_TRIM) {
365 do_io_u_trim(td, io_u);
366 io_u_mark_submit(td, 1);
367 io_u_mark_complete(td, 1);
368 return FIO_Q_COMPLETED;
372 next_tail = tail + 1;
374 if (next_tail == *ring->head)
377 if (o->cmdprio_percentage)
378 fio_ioring_prio_prep(td, io_u);
379 ring->array[tail & ld->sq_ring_mask] = io_u->index;
380 *ring->tail = next_tail;
387 static void fio_ioring_queued(struct thread_data *td, int start, int nr)
389 struct ioring_data *ld = td->io_ops_data;
392 if (!fio_fill_issue_time(td))
395 fio_gettime(&now, NULL);
398 struct io_sq_ring *ring = &ld->sq_ring;
399 int index = ring->array[start & ld->sq_ring_mask];
400 struct io_u *io_u = ld->io_u_index[index];
402 memcpy(&io_u->issue_time, &now, sizeof(now));
403 io_u_queued(td, io_u);
409 static int fio_ioring_commit(struct thread_data *td)
411 struct ioring_data *ld = td->io_ops_data;
412 struct ioring_options *o = td->eo;
419 * Kernel side does submission. just need to check if the ring is
420 * flagged as needing a kick, if so, call io_uring_enter(). This
421 * only happens if we've been idle too long.
423 if (o->sqpoll_thread) {
424 struct io_sq_ring *ring = &ld->sq_ring;
427 if (*ring->flags & IORING_SQ_NEED_WAKEUP)
428 io_uring_enter(ld, ld->queued, 0,
429 IORING_ENTER_SQ_WAKEUP);
435 unsigned start = *ld->sq_ring.head;
436 long nr = ld->queued;
438 ret = io_uring_enter(ld, nr, 0, IORING_ENTER_GETEVENTS);
440 fio_ioring_queued(td, start, ret);
441 io_u_mark_submit(td, ret);
446 io_u_mark_submit(td, ret);
449 if (errno == EAGAIN || errno == EINTR) {
450 ret = fio_ioring_cqring_reap(td, 0, ld->queued);
453 /* Shouldn't happen */
457 td_verror(td, errno, "io_uring_enter submit");
460 } while (ld->queued);
465 static void fio_ioring_unmap(struct ioring_data *ld)
469 for (i = 0; i < ARRAY_SIZE(ld->mmap); i++)
470 munmap(ld->mmap[i].ptr, ld->mmap[i].len);
474 static void fio_ioring_cleanup(struct thread_data *td)
476 struct ioring_data *ld = td->io_ops_data;
479 if (!(td->flags & TD_F_CHILD))
480 fio_ioring_unmap(ld);
482 free(ld->io_u_index);
489 static int fio_ioring_mmap(struct ioring_data *ld, struct io_uring_params *p)
491 struct io_sq_ring *sring = &ld->sq_ring;
492 struct io_cq_ring *cring = &ld->cq_ring;
495 ld->mmap[0].len = p->sq_off.array + p->sq_entries * sizeof(__u32);
496 ptr = mmap(0, ld->mmap[0].len, PROT_READ | PROT_WRITE,
497 MAP_SHARED | MAP_POPULATE, ld->ring_fd,
499 ld->mmap[0].ptr = ptr;
500 sring->head = ptr + p->sq_off.head;
501 sring->tail = ptr + p->sq_off.tail;
502 sring->ring_mask = ptr + p->sq_off.ring_mask;
503 sring->ring_entries = ptr + p->sq_off.ring_entries;
504 sring->flags = ptr + p->sq_off.flags;
505 sring->array = ptr + p->sq_off.array;
506 ld->sq_ring_mask = *sring->ring_mask;
508 ld->mmap[1].len = p->sq_entries * sizeof(struct io_uring_sqe);
509 ld->sqes = mmap(0, ld->mmap[1].len, PROT_READ | PROT_WRITE,
510 MAP_SHARED | MAP_POPULATE, ld->ring_fd,
512 ld->mmap[1].ptr = ld->sqes;
514 ld->mmap[2].len = p->cq_off.cqes +
515 p->cq_entries * sizeof(struct io_uring_cqe);
516 ptr = mmap(0, ld->mmap[2].len, PROT_READ | PROT_WRITE,
517 MAP_SHARED | MAP_POPULATE, ld->ring_fd,
519 ld->mmap[2].ptr = ptr;
520 cring->head = ptr + p->cq_off.head;
521 cring->tail = ptr + p->cq_off.tail;
522 cring->ring_mask = ptr + p->cq_off.ring_mask;
523 cring->ring_entries = ptr + p->cq_off.ring_entries;
524 cring->cqes = ptr + p->cq_off.cqes;
525 ld->cq_ring_mask = *cring->ring_mask;
529 static int fio_ioring_queue_init(struct thread_data *td)
531 struct ioring_data *ld = td->io_ops_data;
532 struct ioring_options *o = td->eo;
533 int depth = td->o.iodepth;
534 struct io_uring_params p;
537 memset(&p, 0, sizeof(p));
540 p.flags |= IORING_SETUP_IOPOLL;
541 if (o->sqpoll_thread) {
542 p.flags |= IORING_SETUP_SQPOLL;
544 p.flags |= IORING_SETUP_SQ_AFF;
545 p.sq_thread_cpu = o->sqpoll_cpu;
549 ret = syscall(__NR_io_uring_setup, depth, &p);
556 struct rlimit rlim = {
557 .rlim_cur = RLIM_INFINITY,
558 .rlim_max = RLIM_INFINITY,
561 if (setrlimit(RLIMIT_MEMLOCK, &rlim) < 0)
564 ret = syscall(__NR_io_uring_register, ld->ring_fd,
565 IORING_REGISTER_BUFFERS, ld->iovecs, depth);
570 return fio_ioring_mmap(ld, &p);
573 static int fio_ioring_register_files(struct thread_data *td)
575 struct ioring_data *ld = td->io_ops_data;
580 ld->fds = calloc(td->o.nr_files, sizeof(int));
582 for_each_file(td, f, i) {
583 ret = generic_open_file(td, f);
590 ret = syscall(__NR_io_uring_register, ld->ring_fd,
591 IORING_REGISTER_FILES, ld->fds, td->o.nr_files);
599 * Pretend the file is closed again, and really close it if we hit
602 for_each_file(td, f, i) {
605 ret2 = generic_close_file(td, f);
613 static int fio_ioring_post_init(struct thread_data *td)
615 struct ioring_data *ld = td->io_ops_data;
616 struct ioring_options *o = td->eo;
620 for (i = 0; i < td->o.iodepth; i++) {
621 struct iovec *iov = &ld->iovecs[i];
623 io_u = ld->io_u_index[i];
624 iov->iov_base = io_u->buf;
625 iov->iov_len = td_max_bs(td);
628 err = fio_ioring_queue_init(td);
630 td_verror(td, errno, "io_queue_init");
634 if (o->registerfiles) {
635 err = fio_ioring_register_files(td);
637 td_verror(td, errno, "ioring_register_files");
645 static unsigned roundup_pow2(unsigned depth)
647 return 1UL << __fls(depth - 1);
650 static int fio_ioring_init(struct thread_data *td)
652 struct ioring_options *o = td->eo;
653 struct ioring_data *ld;
654 struct thread_options *to = &td->o;
656 /* sqthread submission requires registered files */
657 if (o->sqpoll_thread)
658 o->registerfiles = 1;
660 if (o->registerfiles && td->o.nr_files != td->o.open_files) {
661 log_err("fio: io_uring registered files require nr_files to "
662 "be identical to open_files\n");
666 ld = calloc(1, sizeof(*ld));
668 /* ring depth must be a power-of-2 */
669 ld->iodepth = td->o.iodepth;
670 td->o.iodepth = roundup_pow2(td->o.iodepth);
673 ld->io_u_index = calloc(td->o.iodepth, sizeof(struct io_u *));
674 ld->iovecs = calloc(td->o.iodepth, sizeof(struct iovec));
676 td->io_ops_data = ld;
679 * Check for option conflicts
681 if ((fio_option_is_set(to, ioprio) || fio_option_is_set(to, ioprio_class)) &&
682 o->cmdprio_percentage != 0) {
683 log_err("%s: cmdprio_percentage option and mutually exclusive "
684 "prio or prioclass option is set, exiting\n", to->name);
685 td_verror(td, EINVAL, "fio_io_uring_init");
691 static int fio_ioring_io_u_init(struct thread_data *td, struct io_u *io_u)
693 struct ioring_data *ld = td->io_ops_data;
695 ld->io_u_index[io_u->index] = io_u;
699 static int fio_ioring_open_file(struct thread_data *td, struct fio_file *f)
701 struct ioring_data *ld = td->io_ops_data;
702 struct ioring_options *o = td->eo;
704 if (!ld || !o->registerfiles)
705 return generic_open_file(td, f);
707 f->fd = ld->fds[f->engine_pos];
711 static int fio_ioring_close_file(struct thread_data *td, struct fio_file *f)
713 struct ioring_data *ld = td->io_ops_data;
714 struct ioring_options *o = td->eo;
716 if (!ld || !o->registerfiles)
717 return generic_close_file(td, f);
723 static struct ioengine_ops ioengine = {
725 .version = FIO_IOOPS_VERSION,
726 .flags = FIO_ASYNCIO_SYNC_TRIM,
727 .init = fio_ioring_init,
728 .post_init = fio_ioring_post_init,
729 .io_u_init = fio_ioring_io_u_init,
730 .prep = fio_ioring_prep,
731 .queue = fio_ioring_queue,
732 .commit = fio_ioring_commit,
733 .getevents = fio_ioring_getevents,
734 .event = fio_ioring_event,
735 .cleanup = fio_ioring_cleanup,
736 .open_file = fio_ioring_open_file,
737 .close_file = fio_ioring_close_file,
738 .get_file_size = generic_get_file_size,
740 .option_struct_size = sizeof(struct ioring_options),
743 static void fio_init fio_ioring_register(void)
745 register_ioengine(&ioengine);
748 static void fio_exit fio_ioring_unregister(void)
750 unregister_ioengine(&ioengine);