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Merge tag 'for-6.12/io_uring-20240913' of git://git.kernel.dk/linux

Pull io_uring updates from Jens Axboe:

 - NAPI fixes and cleanups (Pavel, Olivier)

 - Add support for absolute timeouts (Pavel)

 - Fixes for io-wq/sqpoll affinities (Felix)

 - Efficiency improvements for dealing with huge pages (Chenliang)

 - Support for a minwait mode, where the application essentially has two
   timouts - one smaller one that defines the batch timeout, and the
   overall large one similar to what we had before. This enables
   efficient use of batching based on count + timeout, while still
   working well with periods of less intensive workloads

 - Use ITER_UBUF for single segment sends

 - Add support for incremental buffer consumption. Right now each
   operation will always consume a full buffer. With incremental
   consumption, a recv/read operation only consumes the part of the
   buffer that it needs to satisfy the operation

 - Add support for GCOV for io_uring, to help retain a high coverage of
   test to code ratio

 - Fix regression with ocfs2, where an odd -EOPNOTSUPP wasn't correctly
   converted to a blocking retry

 - Add support for cloning registered buffers from one ring to another

 - Misc cleanups (Anuj, me)

* tag 'for-6.12/io_uring-20240913' of git://git.kernel.dk/linux: (35 commits)
  io_uring: add IORING_REGISTER_COPY_BUFFERS method
  io_uring/register: provide helper to get io_ring_ctx from 'fd'
  io_uring/rsrc: add reference count to struct io_mapped_ubuf
  io_uring/rsrc: clear 'slot' entry upfront
  io_uring/io-wq: inherit cpuset of cgroup in io worker
  io_uring/io-wq: do not allow pinning outside of cpuset
  io_uring/rw: drop -EOPNOTSUPP check in __io_complete_rw_common()
  io_uring/rw: treat -EOPNOTSUPP for IOCB_NOWAIT like -EAGAIN
  io_uring/sqpoll: do not allow pinning outside of cpuset
  io_uring/eventfd: move refs to refcount_t
  io_uring: remove unused rsrc_put_fn
  io_uring: add new line after variable declaration
  io_uring: add GCOV_PROFILE_URING Kconfig option
  io_uring/kbuf: add support for incremental buffer consumption
  io_uring/kbuf: pass in 'len' argument for buffer commit
  Revert "io_uring: Require zeroed sqe->len on provided-buffers send"
  io_uring/kbuf: move io_ring_head_to_buf() to kbuf.h
  io_uring/kbuf: add io_kbuf_commit() helper
  io_uring/kbuf: shrink nr_iovs/mode in struct buf_sel_arg
  io_uring: wire up min batch wake timeout
  ...
This commit is contained in:
Linus Torvalds 2024-09-16 13:29:00 +02:00
commit 3a4d319a8f
20 changed files with 725 additions and 262 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/io_uring_types.h
View File

@ -239,6 +239,9 @@ struct io_ring_ctx {
struct io_rings *rings;
struct percpu_ref refs;
clockid_t clockid;
enum tk_offsets clock_offset;
enum task_work_notify_mode notify_method;
unsigned sq_thread_idle;
} ____cacheline_aligned_in_smp;

42
include/uapi/linux/io_uring.h
View File

@ -440,11 +440,21 @@ struct io_uring_cqe {
* IORING_CQE_F_SOCK_NONEMPTY If set, more data to read after socket recv
* IORING_CQE_F_NOTIF Set for notification CQEs. Can be used to distinct
* them from sends.
* IORING_CQE_F_BUF_MORE If set, the buffer ID set in the completion will get
* more completions. In other words, the buffer is being
* partially consumed, and will be used by the kernel for
* more completions. This is only set for buffers used via
* the incremental buffer consumption, as provided by
* a ring buffer setup with IOU_PBUF_RING_INC. For any
* other provided buffer type, all completions with a
* buffer passed back is automatically returned to the
* application.
*/
#define IORING_CQE_F_BUFFER (1U << 0)
#define IORING_CQE_F_MORE (1U << 1)
#define IORING_CQE_F_SOCK_NONEMPTY (1U << 2)
#define IORING_CQE_F_NOTIF (1U << 3)
#define IORING_CQE_F_BUF_MORE (1U << 4)
#define IORING_CQE_BUFFER_SHIFT 16
@ -507,6 +517,7 @@ struct io_cqring_offsets {
#define IORING_ENTER_SQ_WAIT (1U << 2)
#define IORING_ENTER_EXT_ARG (1U << 3)
#define IORING_ENTER_REGISTERED_RING (1U << 4)
#define IORING_ENTER_ABS_TIMER (1U << 5)
/*
* Passed in for io_uring_setup(2). Copied back with updated info on success
@ -542,6 +553,7 @@ struct io_uring_params {
#define IORING_FEAT_LINKED_FILE (1U << 12)
#define IORING_FEAT_REG_REG_RING (1U << 13)
#define IORING_FEAT_RECVSEND_BUNDLE (1U << 14)
#define IORING_FEAT_MIN_TIMEOUT (1U << 15)
/*
* io_uring_register(2) opcodes and arguments
@ -595,6 +607,11 @@ enum io_uring_register_op {
IORING_REGISTER_NAPI = 27,
IORING_UNREGISTER_NAPI = 28,
IORING_REGISTER_CLOCK = 29,
/* copy registered buffers from source ring to current ring */
IORING_REGISTER_COPY_BUFFERS = 30,
/* this goes last */
IORING_REGISTER_LAST,
@ -675,6 +692,21 @@ struct io_uring_restriction {
__u32 resv2[3];
};
struct io_uring_clock_register {
__u32 clockid;
__u32 __resv[3];
};
enum {
IORING_REGISTER_SRC_REGISTERED = 1,
};
struct io_uring_copy_buffers {
__u32 src_fd;
__u32 flags;
__u32 pad[6];
};
struct io_uring_buf {
__u64 addr;
__u32 len;
@ -707,9 +739,17 @@ struct io_uring_buf_ring {
* mmap(2) with the offset set as:
* IORING_OFF_PBUF_RING | (bgid << IORING_OFF_PBUF_SHIFT)
* to get a virtual mapping for the ring.
* IOU_PBUF_RING_INC: If set, buffers consumed from this buffer ring can be
* consumed incrementally. Normally one (or more) buffers
* are fully consumed. With incremental consumptions, it's
* feasible to register big ranges of buffers, and each
* use of it will consume only as much as it needs. This
* requires that both the kernel and application keep
* track of where the current read/recv index is at.
*/
enum io_uring_register_pbuf_ring_flags {
IOU_PBUF_RING_MMAP = 1,
IOU_PBUF_RING_INC = 2,
};
/* argument for IORING_(UN)REGISTER_PBUF_RING */
@ -758,7 +798,7 @@ enum io_uring_register_restriction_op {
struct io_uring_getevents_arg {
__u64 sigmask;
__u32 sigmask_sz;
__u32 pad;
__u32 min_wait_usec;
__u64 ts;
};

13
init/Kconfig
View File

@ -1687,6 +1687,19 @@ config IO_URING
applications to submit and complete IO through submission and
completion rings that are shared between the kernel and application.
config GCOV_PROFILE_URING
bool "Enable GCOV profiling on the io_uring subsystem"
depends on GCOV_KERNEL
help
Enable GCOV profiling on the io_uring subsystem, to facilitate
code coverage testing.
If unsure, say N.
Note that this will have a negative impact on the performance of
the io_uring subsystem, hence this should only be enabled for
specific test purposes.
config ADVISE_SYSCALLS
bool "Enable madvise/fadvise syscalls" if EXPERT
default y

4
io_uring/Makefile
View File

@ -2,6 +2,10 @@
#
# Makefile for io_uring
ifdef CONFIG_GCOV_PROFILE_URING
GCOV_PROFILE := y
endif
obj-$(CONFIG_IO_URING) += io_uring.o opdef.o kbuf.o rsrc.o notif.o \
tctx.o filetable.o rw.o net.o poll.o \
eventfd.o uring_cmd.o openclose.o \

13
io_uring/eventfd.c
View File

@ -15,7 +15,7 @@ struct io_ev_fd {
struct eventfd_ctx *cq_ev_fd;
unsigned int eventfd_async: 1;
struct rcu_head rcu;
atomic_t refs;
refcount_t refs;
atomic_t ops;
};
@ -37,7 +37,7 @@ static void io_eventfd_do_signal(struct rcu_head *rcu)
eventfd_signal_mask(ev_fd->cq_ev_fd, EPOLL_URING_WAKE);
if (atomic_dec_and_test(&ev_fd->refs))
if (refcount_dec_and_test(&ev_fd->refs))
io_eventfd_free(rcu);
}
@ -63,7 +63,7 @@ void io_eventfd_signal(struct io_ring_ctx *ctx)
*/
if (unlikely(!ev_fd))
return;
if (!atomic_inc_not_zero(&ev_fd->refs))
if (!refcount_inc_not_zero(&ev_fd->refs))
return;
if (ev_fd->eventfd_async && !io_wq_current_is_worker())
goto out;
@ -77,7 +77,7 @@ void io_eventfd_signal(struct io_ring_ctx *ctx)
}
}
out:
if (atomic_dec_and_test(&ev_fd->refs))
if (refcount_dec_and_test(&ev_fd->refs))
call_rcu(&ev_fd->rcu, io_eventfd_free);
}
@ -126,6 +126,7 @@ int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg,
ev_fd->cq_ev_fd = eventfd_ctx_fdget(fd);
if (IS_ERR(ev_fd->cq_ev_fd)) {
int ret = PTR_ERR(ev_fd->cq_ev_fd);
kfree(ev_fd);
return ret;
}
@ -136,7 +137,7 @@ int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg,
ev_fd->eventfd_async = eventfd_async;
ctx->has_evfd = true;
atomic_set(&ev_fd->refs, 1);
refcount_set(&ev_fd->refs, 1);
atomic_set(&ev_fd->ops, 0);
rcu_assign_pointer(ctx->io_ev_fd, ev_fd);
return 0;
@ -151,7 +152,7 @@ int io_eventfd_unregister(struct io_ring_ctx *ctx)
if (ev_fd) {
ctx->has_evfd = false;
rcu_assign_pointer(ctx->io_ev_fd, NULL);
if (atomic_dec_and_test(&ev_fd->refs))
if (refcount_dec_and_test(&ev_fd->refs))
call_rcu(&ev_fd->rcu, io_eventfd_free);
return 0;
}

14
io_uring/fdinfo.c
View File

@ -221,7 +221,19 @@ __cold void io_uring_show_fdinfo(struct seq_file *m, struct file *file)
cqe->user_data, cqe->res, cqe->flags);
}
spin_unlock(&ctx->completion_lock);
#ifdef CONFIG_NET_RX_BUSY_POLL
if (ctx->napi_enabled) {
seq_puts(m, "NAPI:\tenabled\n");
seq_printf(m, "napi_busy_poll_dt:\t%llu\n", ctx->napi_busy_poll_dt);
if (ctx->napi_prefer_busy_poll)
seq_puts(m, "napi_prefer_busy_poll:\ttrue\n");
else
seq_puts(m, "napi_prefer_busy_poll:\tfalse\n");
} else {
seq_puts(m, "NAPI:\tdisabled\n");
}
#endif
}
#endif

21
io_uring/io-wq.c
View File

@ -13,6 +13,7 @@
#include <linux/slab.h>
#include <linux/rculist_nulls.h>
#include <linux/cpu.h>
#include <linux/cpuset.h>
#include <linux/task_work.h>
#include <linux/audit.h>
#include <linux/mmu_context.h>
@ -1167,7 +1168,7 @@ struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data)
if (!alloc_cpumask_var(&wq->cpu_mask, GFP_KERNEL))
goto err;
cpumask_copy(wq->cpu_mask, cpu_possible_mask);
cpuset_cpus_allowed(data->task, wq->cpu_mask);
wq->acct[IO_WQ_ACCT_BOUND].max_workers = bounded;
wq->acct[IO_WQ_ACCT_UNBOUND].max_workers =
task_rlimit(current, RLIMIT_NPROC);
@ -1322,17 +1323,29 @@ static int io_wq_cpu_offline(unsigned int cpu, struct hlist_node *node)
int io_wq_cpu_affinity(struct io_uring_task *tctx, cpumask_var_t mask)
{
cpumask_var_t allowed_mask;
int ret = 0;
if (!tctx || !tctx->io_wq)
return -EINVAL;
if (!alloc_cpumask_var(&allowed_mask, GFP_KERNEL))
return -ENOMEM;
rcu_read_lock();
if (mask)
cpuset_cpus_allowed(tctx->io_wq->task, allowed_mask);
if (mask) {
if (cpumask_subset(mask, allowed_mask))
cpumask_copy(tctx->io_wq->cpu_mask, mask);
else
cpumask_copy(tctx->io_wq->cpu_mask, cpu_possible_mask);
ret = -EINVAL;
} else {
cpumask_copy(tctx->io_wq->cpu_mask, allowed_mask);
}
rcu_read_unlock();
return 0;
free_cpumask_var(allowed_mask);
return ret;
}
/*

212
io_uring/io_uring.c
View File

@ -904,7 +904,7 @@ void io_req_defer_failed(struct io_kiocb *req, s32 res)
lockdep_assert_held(&req->ctx->uring_lock);
req_set_fail(req);
io_req_set_res(req, res, io_put_kbuf(req, IO_URING_F_UNLOCKED));
io_req_set_res(req, res, io_put_kbuf(req, res, IO_URING_F_UNLOCKED));
if (def->fail)
def->fail(req);
io_req_complete_defer(req);
@ -2350,12 +2350,113 @@ static bool current_pending_io(void)
return percpu_counter_read_positive(&tctx->inflight);
}
/* when returns >0, the caller should retry */
static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx,
struct io_wait_queue *iowq)
static enum hrtimer_restart io_cqring_timer_wakeup(struct hrtimer *timer)
{
int ret;
struct io_wait_queue *iowq = container_of(timer, struct io_wait_queue, t);
WRITE_ONCE(iowq->hit_timeout, 1);
iowq->min_timeout = 0;
wake_up_process(iowq->wq.private);
return HRTIMER_NORESTART;
}
/*
* Doing min_timeout portion. If we saw any timeouts, events, or have work,
* wake up. If not, and we have a normal timeout, switch to that and keep
* sleeping.
*/
static enum hrtimer_restart io_cqring_min_timer_wakeup(struct hrtimer *timer)
{
struct io_wait_queue *iowq = container_of(timer, struct io_wait_queue, t);
struct io_ring_ctx *ctx = iowq->ctx;
/* no general timeout, or shorter (or equal), we are done */
if (iowq->timeout == KTIME_MAX ||
ktime_compare(iowq->min_timeout, iowq->timeout) >= 0)
goto out_wake;
/* work we may need to run, wake function will see if we need to wake */
if (io_has_work(ctx))
goto out_wake;
/* got events since we started waiting, min timeout is done */
if (iowq->cq_min_tail != READ_ONCE(ctx->rings->cq.tail))
goto out_wake;
/* if we have any events and min timeout expired, we're done */
if (io_cqring_events(ctx))
goto out_wake;
/*
* If using deferred task_work running and application is waiting on
* more than one request, ensure we reset it now where we are switching
* to normal sleeps. Any request completion post min_wait should wake
* the task and return.
*/
if (ctx->flags & IORING_SETUP_DEFER_TASKRUN) {
atomic_set(&ctx->cq_wait_nr, 1);
smp_mb();
if (!llist_empty(&ctx->work_llist))
goto out_wake;
}
iowq->t.function = io_cqring_timer_wakeup;
hrtimer_set_expires(timer, iowq->timeout);
return HRTIMER_RESTART;
out_wake:
return io_cqring_timer_wakeup(timer);
}
static int io_cqring_schedule_timeout(struct io_wait_queue *iowq,
clockid_t clock_id, ktime_t start_time)
{
ktime_t timeout;
hrtimer_init_on_stack(&iowq->t, clock_id, HRTIMER_MODE_ABS);
if (iowq->min_timeout) {
timeout = ktime_add_ns(iowq->min_timeout, start_time);
iowq->t.function = io_cqring_min_timer_wakeup;
} else {
timeout = iowq->timeout;
iowq->t.function = io_cqring_timer_wakeup;
}
hrtimer_set_expires_range_ns(&iowq->t, timeout, 0);
hrtimer_start_expires(&iowq->t, HRTIMER_MODE_ABS);
if (!READ_ONCE(iowq->hit_timeout))
schedule();
hrtimer_cancel(&iowq->t);
destroy_hrtimer_on_stack(&iowq->t);
__set_current_state(TASK_RUNNING);
return READ_ONCE(iowq->hit_timeout) ? -ETIME : 0;
}
static int __io_cqring_wait_schedule(struct io_ring_ctx *ctx,
struct io_wait_queue *iowq,
ktime_t start_time)
{
int ret = 0;
/*
* Mark us as being in io_wait if we have pending requests, so cpufreq
* can take into account that the task is waiting for IO - turns out
* to be important for low QD IO.
*/
if (current_pending_io())
current->in_iowait = 1;
if (iowq->timeout != KTIME_MAX || iowq->min_timeout)
ret = io_cqring_schedule_timeout(iowq, ctx->clockid, start_time);
else
schedule();
current->in_iowait = 0;
return ret;
}
/* If this returns > 0, the caller should retry */
static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx,
struct io_wait_queue *iowq,
ktime_t start_time)
{
if (unlikely(READ_ONCE(ctx->check_cq)))
return 1;
if (unlikely(!llist_empty(&ctx->work_llist)))
@ -2367,32 +2468,26 @@ static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx,
if (unlikely(io_should_wake(iowq)))
return 0;
/*
* Mark us as being in io_wait if we have pending requests, so cpufreq
* can take into account that the task is waiting for IO - turns out
* to be important for low QD IO.
*/
if (current_pending_io())
current->in_iowait = 1;
ret = 0;
if (iowq->timeout == KTIME_MAX)
schedule();
else if (!schedule_hrtimeout(&iowq->timeout, HRTIMER_MODE_ABS))
ret = -ETIME;
current->in_iowait = 0;
return ret;
return __io_cqring_wait_schedule(ctx, iowq, start_time);
}
struct ext_arg {
size_t argsz;
struct __kernel_timespec __user *ts;
const sigset_t __user *sig;
ktime_t min_time;
};
/*
* Wait until events become available, if we don't already have some. The
* application must reap them itself, as they reside on the shared cq ring.
*/
static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
const sigset_t __user *sig, size_t sigsz,
struct __kernel_timespec __user *uts)
static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, u32 flags,
struct ext_arg *ext_arg)
{
struct io_wait_queue iowq;
struct io_rings *rings = ctx->rings;
ktime_t start_time;
int ret;
if (!io_allowed_run_tw(ctx))
@ -2410,30 +2505,33 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
iowq.wq.private = current;
INIT_LIST_HEAD(&iowq.wq.entry);
iowq.ctx = ctx;
iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts);
iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events;
iowq.cq_min_tail = READ_ONCE(ctx->rings->cq.tail);
iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts);
iowq.hit_timeout = 0;
iowq.min_timeout = ext_arg->min_time;
iowq.timeout = KTIME_MAX;
start_time = io_get_time(ctx);
if (uts) {
if (ext_arg->ts) {
struct timespec64 ts;
ktime_t dt;
if (get_timespec64(&ts, uts))
if (get_timespec64(&ts, ext_arg->ts))
return -EFAULT;
dt = timespec64_to_ktime(ts);
iowq.timeout = ktime_add(dt, ktime_get());
io_napi_adjust_timeout(ctx, &iowq, dt);
iowq.timeout = timespec64_to_ktime(ts);
if (!(flags & IORING_ENTER_ABS_TIMER))
iowq.timeout = ktime_add(iowq.timeout, start_time);
}
if (sig) {
if (ext_arg->sig) {
#ifdef CONFIG_COMPAT
if (in_compat_syscall())
ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig,
sigsz);
ret = set_compat_user_sigmask((const compat_sigset_t __user *)ext_arg->sig,
ext_arg->argsz);
else
#endif
ret = set_user_sigmask(sig, sigsz);
ret = set_user_sigmask(ext_arg->sig, ext_arg->argsz);
if (ret)
return ret;
@ -2443,8 +2541,15 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
trace_io_uring_cqring_wait(ctx, min_events);
do {
int nr_wait = (int) iowq.cq_tail - READ_ONCE(ctx->rings->cq.tail);
unsigned long check_cq;
int nr_wait;
/* if min timeout has been hit, don't reset wait count */
if (!iowq.hit_timeout)
nr_wait = (int) iowq.cq_tail -
READ_ONCE(ctx->rings->cq.tail);
else
nr_wait = 1;
if (ctx->flags & IORING_SETUP_DEFER_TASKRUN) {
atomic_set(&ctx->cq_wait_nr, nr_wait);
@ -2454,7 +2559,7 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
TASK_INTERRUPTIBLE);
}
ret = io_cqring_wait_schedule(ctx, &iowq);
ret = io_cqring_wait_schedule(ctx, &iowq, start_time);
__set_current_state(TASK_RUNNING);
atomic_set(&ctx->cq_wait_nr, IO_CQ_WAKE_INIT);
@ -3112,9 +3217,8 @@ static int io_validate_ext_arg(unsigned flags, const void __user *argp, size_t a
return 0;
}
static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz,
struct __kernel_timespec __user **ts,
const sigset_t __user **sig)
static int io_get_ext_arg(unsigned flags, const void __user *argp,
struct ext_arg *ext_arg)
{
struct io_uring_getevents_arg arg;
@ -3123,8 +3227,8 @@ static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz
* is just a pointer to the sigset_t.
*/
if (!(flags & IORING_ENTER_EXT_ARG)) {
*sig = (const sigset_t __user *) argp;
*ts = NULL;
ext_arg->sig = (const sigset_t __user *) argp;
ext_arg->ts = NULL;
return 0;
}
@ -3132,15 +3236,14 @@ static int io_get_ext_arg(unsigned flags, const void __user *argp, size_t *argsz
* EXT_ARG is set - ensure we agree on the size of it and copy in our
* timespec and sigset_t pointers if good.
*/
if (*argsz != sizeof(arg))
if (ext_arg->argsz != sizeof(arg))
return -EINVAL;
if (copy_from_user(&arg, argp, sizeof(arg)))
return -EFAULT;
if (arg.pad)
return -EINVAL;
*sig = u64_to_user_ptr(arg.sigmask);
*argsz = arg.sigmask_sz;
*ts = u64_to_user_ptr(arg.ts);
ext_arg->min_time = arg.min_wait_usec * NSEC_PER_USEC;
ext_arg->sig = u64_to_user_ptr(arg.sigmask);
ext_arg->argsz = arg.sigmask_sz;
ext_arg->ts = u64_to_user_ptr(arg.ts);
return 0;
}
@ -3154,7 +3257,8 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
if (unlikely(flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP |
IORING_ENTER_SQ_WAIT | IORING_ENTER_EXT_ARG |
IORING_ENTER_REGISTERED_RING)))
IORING_ENTER_REGISTERED_RING |
IORING_ENTER_ABS_TIMER)))
return -EINVAL;
/*
@ -3245,15 +3349,14 @@ iopoll_locked:
}
mutex_unlock(&ctx->uring_lock);
} else {
const sigset_t __user *sig;
struct __kernel_timespec __user *ts;
struct ext_arg ext_arg = { .argsz = argsz };
ret2 = io_get_ext_arg(flags, argp, &argsz, &ts, &sig);
ret2 = io_get_ext_arg(flags, argp, &ext_arg);
if (likely(!ret2)) {
min_complete = min(min_complete,
ctx->cq_entries);
ret2 = io_cqring_wait(ctx, min_complete, sig,
argsz, ts);
ret2 = io_cqring_wait(ctx, min_complete, flags,
&ext_arg);
}
}
@ -3424,6 +3527,9 @@ static __cold int io_uring_create(unsigned entries, struct io_uring_params *p,
if (!ctx)
return -ENOMEM;
ctx->clockid = CLOCK_MONOTONIC;
ctx->clock_offset = 0;
if ((ctx->flags & IORING_SETUP_DEFER_TASKRUN) &&
!(ctx->flags & IORING_SETUP_IOPOLL) &&
!(ctx->flags & IORING_SETUP_SQPOLL))
@ -3535,7 +3641,7 @@ static __cold int io_uring_create(unsigned entries, struct io_uring_params *p,
IORING_FEAT_EXT_ARG | IORING_FEAT_NATIVE_WORKERS |
IORING_FEAT_RSRC_TAGS | IORING_FEAT_CQE_SKIP |
IORING_FEAT_LINKED_FILE | IORING_FEAT_REG_REG_RING |
IORING_FEAT_RECVSEND_BUNDLE;
IORING_FEAT_RECVSEND_BUNDLE | IORING_FEAT_MIN_TIMEOUT;
if (copy_to_user(params, p, sizeof(*p))) {
ret = -EFAULT;

12
io_uring/io_uring.h
View File

@ -39,8 +39,12 @@ struct io_wait_queue {
struct wait_queue_entry wq;
struct io_ring_ctx *ctx;
unsigned cq_tail;
unsigned cq_min_tail;
unsigned nr_timeouts;
int hit_timeout;
ktime_t min_timeout;
ktime_t timeout;
struct hrtimer t;
#ifdef CONFIG_NET_RX_BUSY_POLL
ktime_t napi_busy_poll_dt;
@ -437,6 +441,14 @@ static inline bool io_file_can_poll(struct io_kiocb *req)
return false;
}
static inline ktime_t io_get_time(struct io_ring_ctx *ctx)
{
if (ctx->clockid == CLOCK_MONOTONIC)
return ktime_get();
return ktime_get_with_offset(ctx->clock_offset);
}
enum {
IO_CHECK_CQ_OVERFLOW_BIT,
IO_CHECK_CQ_DROPPED_BIT,

88
io_uring/kbuf.c
View File

@ -70,7 +70,7 @@ bool io_kbuf_recycle_legacy(struct io_kiocb *req, unsigned issue_flags)
return true;
}
void __io_put_kbuf(struct io_kiocb *req, unsigned issue_flags)
void __io_put_kbuf(struct io_kiocb *req, int len, unsigned issue_flags)
{
/*
* We can add this buffer back to two lists:
@ -88,12 +88,12 @@ void __io_put_kbuf(struct io_kiocb *req, unsigned issue_flags)
struct io_ring_ctx *ctx = req->ctx;
spin_lock(&ctx->completion_lock);
__io_put_kbuf_list(req, &ctx->io_buffers_comp);
__io_put_kbuf_list(req, len, &ctx->io_buffers_comp);
spin_unlock(&ctx->completion_lock);
} else {
lockdep_assert_held(&req->ctx->uring_lock);
__io_put_kbuf_list(req, &req->ctx->io_buffers_cache);
__io_put_kbuf_list(req, len, &req->ctx->io_buffers_cache);
}
}
@ -132,12 +132,6 @@ static int io_provided_buffers_select(struct io_kiocb *req, size_t *len,
return 1;
}
static struct io_uring_buf *io_ring_head_to_buf(struct io_uring_buf_ring *br,
__u16 head, __u16 mask)
{
return &br->bufs[head & mask];
}
static void __user *io_ring_buffer_select(struct io_kiocb *req, size_t *len,
struct io_buffer_list *bl,
unsigned int issue_flags)
@ -171,9 +165,8 @@ static void __user *io_ring_buffer_select(struct io_kiocb *req, size_t *len,
* the transfer completes (or if we get -EAGAIN and must poll of
* retry).
*/
req->flags &= ~REQ_F_BUFFERS_COMMIT;
io_kbuf_commit(req, bl, *len, 1);
req->buf_list = NULL;
bl->head++;
}
return u64_to_user_ptr(buf->addr);
}
@ -189,7 +182,7 @@ void __user *io_buffer_select(struct io_kiocb *req, size_t *len,
bl = io_buffer_get_list(ctx, req->buf_index);
if (likely(bl)) {
if (bl->is_buf_ring)
if (bl->flags & IOBL_BUF_RING)
ret = io_ring_buffer_select(req, len, bl, issue_flags);
else
ret = io_provided_buffer_select(req, len, bl);
@ -219,15 +212,26 @@ static int io_ring_buffers_peek(struct io_kiocb *req, struct buf_sel_arg *arg,
buf = io_ring_head_to_buf(br, head, bl->mask);
if (arg->max_len) {
u32 len = READ_ONCE(buf->len);
size_t needed;
if (unlikely(!len))
return -ENOBUFS;
/*
* Limit incremental buffers to 1 segment. No point trying
* to peek ahead and map more than we need, when the buffers
* themselves should be large when setup with
* IOU_PBUF_RING_INC.
*/
if (bl->flags & IOBL_INC) {
nr_avail = 1;
} else {
size_t needed;
needed = (arg->max_len + len - 1) / len;
needed = min_not_zero(needed, (size_t) PEEK_MAX_IMPORT);
if (nr_avail > needed)
nr_avail = needed;
}
}
/*
* only alloc a bigger array if we know we have data to map, eg not
@ -251,16 +255,21 @@ static int io_ring_buffers_peek(struct io_kiocb *req, struct buf_sel_arg *arg,
req->buf_index = buf->bid;
do {
/* truncate end piece, if needed */
if (buf->len > arg->max_len)
buf->len = arg->max_len;
u32 len = buf->len;
/* truncate end piece, if needed, for non partial buffers */
if (len > arg->max_len) {
len = arg->max_len;
if (!(bl->flags & IOBL_INC))
buf->len = len;
}
iov->iov_base = u64_to_user_ptr(buf->addr);
iov->iov_len = buf->len;
iov->iov_len = len;
iov++;
arg->out_len += buf->len;
arg->max_len -= buf->len;
arg->out_len += len;
arg->max_len -= len;
if (!arg->max_len)
break;
@ -287,7 +296,7 @@ int io_buffers_select(struct io_kiocb *req, struct buf_sel_arg *arg,
if (unlikely(!bl))
goto out_unlock;
if (bl->is_buf_ring) {
if (bl->flags & IOBL_BUF_RING) {
ret = io_ring_buffers_peek(req, arg, bl);
/*
* Don't recycle these buffers if we need to go through poll.
@ -297,8 +306,8 @@ int io_buffers_select(struct io_kiocb *req, struct buf_sel_arg *arg,
* committed them, they cannot be put back in the queue.
*/
if (ret > 0) {
req->flags |= REQ_F_BL_NO_RECYCLE;
req->buf_list->head += ret;
req->flags |= REQ_F_BUFFERS_COMMIT | REQ_F_BL_NO_RECYCLE;
io_kbuf_commit(req, bl, arg->out_len, ret);
}
} else {
ret = io_provided_buffers_select(req, &arg->out_len, bl, arg->iovs);
@ -320,7 +329,7 @@ int io_buffers_peek(struct io_kiocb *req, struct buf_sel_arg *arg)
if (unlikely(!bl))
return -ENOENT;
if (bl->is_buf_ring) {
if (bl->flags & IOBL_BUF_RING) {
ret = io_ring_buffers_peek(req, arg, bl);
if (ret > 0)
req->flags |= REQ_F_BUFFERS_COMMIT;
@ -340,22 +349,22 @@ static int __io_remove_buffers(struct io_ring_ctx *ctx,
if (!nbufs)
return 0;
if (bl->is_buf_ring) {
if (bl->flags & IOBL_BUF_RING) {
i = bl->buf_ring->tail - bl->head;
if (bl->buf_nr_pages) {
int j;
if (!bl->is_mmap) {
if (!(bl->flags & IOBL_MMAP)) {
for (j = 0; j < bl->buf_nr_pages; j++)
unpin_user_page(bl->buf_pages[j]);
}
io_pages_unmap(bl->buf_ring, &bl->buf_pages,
&bl->buf_nr_pages, bl->is_mmap);
bl->is_mmap = 0;
&bl->buf_nr_pages, bl->flags & IOBL_MMAP);
bl->flags &= ~IOBL_MMAP;
}
/* make sure it's seen as empty */
INIT_LIST_HEAD(&bl->buf_list);
bl->is_buf_ring = 0;
bl->flags &= ~IOBL_BUF_RING;
return i;
}
@ -442,7 +451,7 @@ int io_remove_buffers(struct io_kiocb *req, unsigned int issue_flags)
if (bl) {
ret = -EINVAL;
/* can't use provide/remove buffers command on mapped buffers */
if (!bl->is_buf_ring)
if (!(bl->flags & IOBL_BUF_RING))
ret = __io_remove_buffers(ctx, bl, p->nbufs);
}
io_ring_submit_unlock(ctx, issue_flags);
@ -589,7 +598,7 @@ int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags)
}
}
/* can't add buffers via this command for a mapped buffer ring */
if (bl->is_buf_ring) {
if (bl->flags & IOBL_BUF_RING) {
ret = -EINVAL;
goto err;
}
@ -641,8 +650,8 @@ static int io_pin_pbuf_ring(struct io_uring_buf_reg *reg,
bl->buf_pages = pages;
bl->buf_nr_pages = nr_pages;
bl->buf_ring = br;
bl->is_buf_ring = 1;
bl->is_mmap = 0;
bl->flags |= IOBL_BUF_RING;
bl->flags &= ~IOBL_MMAP;
return 0;
error_unpin:
unpin_user_pages(pages, nr_pages);
@ -665,8 +674,7 @@ static int io_alloc_pbuf_ring(struct io_ring_ctx *ctx,
return -ENOMEM;
}
bl->is_buf_ring = 1;
bl->is_mmap = 1;
bl->flags |= (IOBL_BUF_RING | IOBL_MMAP);
return 0;
}
@ -683,7 +691,7 @@ int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg)
if (reg.resv[0] || reg.resv[1] || reg.resv[2])
return -EINVAL;
if (reg.flags & ~IOU_PBUF_RING_MMAP)
if (reg.flags & ~(IOU_PBUF_RING_MMAP | IOU_PBUF_RING_INC))
return -EINVAL;
if (!(reg.flags & IOU_PBUF_RING_MMAP)) {
if (!reg.ring_addr)
@ -705,7 +713,7 @@ int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg)
bl = io_buffer_get_list(ctx, reg.bgid);
if (bl) {
/* if mapped buffer ring OR classic exists, don't allow */
if (bl->is_buf_ring || !list_empty(&bl->buf_list))
if (bl->flags & IOBL_BUF_RING || !list_empty(&bl->buf_list))
return -EEXIST;
} else {
free_bl = bl = kzalloc(sizeof(*bl), GFP_KERNEL);
@ -721,6 +729,8 @@ int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg)
if (!ret) {
bl->nr_entries = reg.ring_entries;
bl->mask = reg.ring_entries - 1;
if (reg.flags & IOU_PBUF_RING_INC)
bl->flags |= IOBL_INC;
io_buffer_add_list(ctx, bl, reg.bgid);
return 0;
@ -747,7 +757,7 @@ int io_unregister_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg)
bl = io_buffer_get_list(ctx, reg.bgid);
if (!bl)
return -ENOENT;
if (!bl->is_buf_ring)
if (!(bl->flags & IOBL_BUF_RING))
return -EINVAL;
xa_erase(&ctx->io_bl_xa, bl->bgid);
@ -771,7 +781,7 @@ int io_register_pbuf_status(struct io_ring_ctx *ctx, void __user *arg)
bl = io_buffer_get_list(ctx, buf_status.buf_group);
if (!bl)
return -ENOENT;
if (!bl->is_buf_ring)
if (!(bl->flags & IOBL_BUF_RING))
return -EINVAL;
buf_status.head = bl->head;
@ -802,7 +812,7 @@ struct io_buffer_list *io_pbuf_get_bl(struct io_ring_ctx *ctx,
bl = xa_load(&ctx->io_bl_xa, bgid);
/* must be a mmap'able buffer ring and have pages */
ret = false;
if (bl && bl->is_mmap)
if (bl && bl->flags & IOBL_MMAP)
ret = atomic_inc_not_zero(&bl->refs);
rcu_read_unlock();

94
io_uring/kbuf.h
View File

@ -4,6 +4,16 @@
#include <uapi/linux/io_uring.h>
enum {
/* ring mapped provided buffers */
IOBL_BUF_RING = 1,
/* ring mapped provided buffers, but mmap'ed by application */
IOBL_MMAP = 2,
/* buffers are consumed incrementally rather than always fully */
IOBL_INC = 4,
};
struct io_buffer_list {
/*
* If ->buf_nr_pages is set, then buf_pages/buf_ring are used. If not,
@ -25,12 +35,9 @@ struct io_buffer_list {
__u16 head;
__u16 mask;
atomic_t refs;
__u16 flags;
/* ring mapped provided buffers */
__u8 is_buf_ring;
/* ring mapped provided buffers, but mmap'ed by application */
__u8 is_mmap;
atomic_t refs;
};
struct io_buffer {
@ -52,8 +59,8 @@ struct buf_sel_arg {
struct iovec *iovs;
size_t out_len;
size_t max_len;
int nr_iovs;
int mode;
unsigned short nr_iovs;
unsigned short mode;
};
void __user *io_buffer_select(struct io_kiocb *req, size_t *len,
@ -73,7 +80,7 @@ int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg);
int io_unregister_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg);
int io_register_pbuf_status(struct io_ring_ctx *ctx, void __user *arg);
void __io_put_kbuf(struct io_kiocb *req, unsigned issue_flags);
void __io_put_kbuf(struct io_kiocb *req, int len, unsigned issue_flags);
bool io_kbuf_recycle_legacy(struct io_kiocb *req, unsigned issue_flags);
@ -117,25 +124,55 @@ static inline bool io_kbuf_recycle(struct io_kiocb *req, unsigned issue_flags)
return false;
}
static inline void __io_put_kbuf_ring(struct io_kiocb *req, int nr)
/* Mapped buffer ring, return io_uring_buf from head */
#define io_ring_head_to_buf(br, head, mask) &(br)->bufs[(head) & (mask)]
static inline bool io_kbuf_commit(struct io_kiocb *req,
struct io_buffer_list *bl, int len, int nr)
{
if (unlikely(!(req->flags & REQ_F_BUFFERS_COMMIT)))
return true;
req->flags &= ~REQ_F_BUFFERS_COMMIT;
if (unlikely(len < 0))
return true;
if (bl->flags & IOBL_INC) {
struct io_uring_buf *buf;
buf = io_ring_head_to_buf(bl->buf_ring, bl->head, bl->mask);
if (WARN_ON_ONCE(len > buf->len))
len = buf->len;
buf->len -= len;
if (buf->len) {
buf->addr += len;
return false;
}
}
bl->head += nr;
return true;
}
static inline bool __io_put_kbuf_ring(struct io_kiocb *req, int len, int nr)
{
struct io_buffer_list *bl = req->buf_list;
bool ret = true;
if (bl) {
if (req->flags & REQ_F_BUFFERS_COMMIT) {
bl->head += nr;
req->flags &= ~REQ_F_BUFFERS_COMMIT;
}
ret = io_kbuf_commit(req, bl, len, nr);
req->buf_index = bl->bgid;
}
req->flags &= ~REQ_F_BUFFER_RING;
return ret;
}
static inline void __io_put_kbuf_list(struct io_kiocb *req,
static inline void __io_put_kbuf_list(struct io_kiocb *req, int len,
struct list_head *list)
{
if (req->flags & REQ_F_BUFFER_RING) {
__io_put_kbuf_ring(req, 1);
__io_put_kbuf_ring(req, len, 1);
} else {
req->buf_index = req->kbuf->bgid;
list_add(&req->kbuf->list, list);
@ -150,11 +187,12 @@ static inline void io_kbuf_drop(struct io_kiocb *req)
if (!(req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING)))
return;
__io_put_kbuf_list(req, &req->ctx->io_buffers_comp);
/* len == 0 is fine here, non-ring will always drop all of it */
__io_put_kbuf_list(req, 0, &req->ctx->io_buffers_comp);
}
static inline unsigned int __io_put_kbufs(struct io_kiocb *req, int nbufs,
unsigned issue_flags)
static inline unsigned int __io_put_kbufs(struct io_kiocb *req, int len,
int nbufs, unsigned issue_flags)
{
unsigned int ret;
@ -162,22 +200,24 @@ static inline unsigned int __io_put_kbufs(struct io_kiocb *req, int nbufs,
return 0;
ret = IORING_CQE_F_BUFFER | (req->buf_index << IORING_CQE_BUFFER_SHIFT);
if (req->flags & REQ_F_BUFFER_RING)
__io_put_kbuf_ring(req, nbufs);
else
__io_put_kbuf(req, issue_flags);
if (req->flags & REQ_F_BUFFER_RING) {
if (!__io_put_kbuf_ring(req, len, nbufs))
ret |= IORING_CQE_F_BUF_MORE;
} else {
__io_put_kbuf(req, len, issue_flags);
}
return ret;
}
static inline unsigned int io_put_kbuf(struct io_kiocb *req,
static inline unsigned int io_put_kbuf(struct io_kiocb *req, int len,
unsigned issue_flags)
{
return __io_put_kbufs(req, 1, issue_flags);
return __io_put_kbufs(req, len, 1, issue_flags);
}
static inline unsigned int io_put_kbufs(struct io_kiocb *req, int nbufs,
unsigned issue_flags)
static inline unsigned int io_put_kbufs(struct io_kiocb *req, int len,
int nbufs, unsigned issue_flags)
{
return __io_put_kbufs(req, nbufs, issue_flags);
return __io_put_kbufs(req, len, nbufs, issue_flags);
}
#endif

33
io_uring/napi.c
View File

@ -269,27 +269,6 @@ int io_unregister_napi(struct io_ring_ctx *ctx, void __user *arg)
return 0;
}
/*
* __io_napi_adjust_timeout() - adjust busy loop timeout
* @ctx: pointer to io-uring context structure
* @iowq: pointer to io wait queue
* @ts: pointer to timespec or NULL
*
* Adjust the busy loop timeout according to timespec and busy poll timeout.
* If the specified NAPI timeout is bigger than the wait timeout, then adjust
* the NAPI timeout accordingly.
*/
void __io_napi_adjust_timeout(struct io_ring_ctx *ctx, struct io_wait_queue *iowq,
ktime_t to_wait)
{
ktime_t poll_dt = READ_ONCE(ctx->napi_busy_poll_dt);
if (to_wait)
poll_dt = min(poll_dt, to_wait);
iowq->napi_busy_poll_dt = poll_dt;
}
/*
* __io_napi_busy_loop() - execute busy poll loop
* @ctx: pointer to io-uring context structure
@ -299,9 +278,17 @@ void __io_napi_adjust_timeout(struct io_ring_ctx *ctx, struct io_wait_queue *iow
*/
void __io_napi_busy_loop(struct io_ring_ctx *ctx, struct io_wait_queue *iowq)
{
iowq->napi_prefer_busy_poll = READ_ONCE(ctx->napi_prefer_busy_poll);
if (ctx->flags & IORING_SETUP_SQPOLL)
return;
if (!(ctx->flags & IORING_SETUP_SQPOLL))
iowq->napi_busy_poll_dt = READ_ONCE(ctx->napi_busy_poll_dt);
if (iowq->timeout != KTIME_MAX) {
ktime_t dt = ktime_sub(iowq->timeout, io_get_time(ctx));
iowq->napi_busy_poll_dt = min_t(u64, iowq->napi_busy_poll_dt, dt);
}
iowq->napi_prefer_busy_poll = READ_ONCE(ctx->napi_prefer_busy_poll);
io_napi_blocking_busy_loop(ctx, iowq);
}

16
io_uring/napi.h
View File

@ -17,8 +17,6 @@ int io_unregister_napi(struct io_ring_ctx *ctx, void __user *arg);
void __io_napi_add(struct io_ring_ctx *ctx, struct socket *sock);
void __io_napi_adjust_timeout(struct io_ring_ctx *ctx,
struct io_wait_queue *iowq, ktime_t to_wait);
void __io_napi_busy_loop(struct io_ring_ctx *ctx, struct io_wait_queue *iowq);
int io_napi_sqpoll_busy_poll(struct io_ring_ctx *ctx);
@ -27,15 +25,6 @@ static inline bool io_napi(struct io_ring_ctx *ctx)
return !list_empty(&ctx->napi_list);
}
static inline void io_napi_adjust_timeout(struct io_ring_ctx *ctx,
struct io_wait_queue *iowq,
ktime_t to_wait)
{
if (!io_napi(ctx))
return;
__io_napi_adjust_timeout(ctx, iowq, to_wait);
}
static inline void io_napi_busy_loop(struct io_ring_ctx *ctx,
struct io_wait_queue *iowq)
{
@ -86,11 +75,6 @@ static inline bool io_napi(struct io_ring_ctx *ctx)
static inline void io_napi_add(struct io_kiocb *req)
{
}
static inline void io_napi_adjust_timeout(struct io_ring_ctx *ctx,
struct io_wait_queue *iowq,
ktime_t to_wait)
{
}
static inline void io_napi_busy_loop(struct io_ring_ctx *ctx,
struct io_wait_queue *iowq)
{

27
io_uring/net.c
View File

@ -434,8 +434,6 @@ int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
sr->buf_group = req->buf_index;
req->buf_list = NULL;
}
if (req->flags & REQ_F_BUFFER_SELECT && sr->len)
return -EINVAL;
#ifdef CONFIG_COMPAT
if (req->ctx->compat)
@ -499,11 +497,11 @@ static inline bool io_send_finish(struct io_kiocb *req, int *ret,
unsigned int cflags;
if (!(sr->flags & IORING_RECVSEND_BUNDLE)) {
cflags = io_put_kbuf(req, issue_flags);
cflags = io_put_kbuf(req, *ret, issue_flags);
goto finish;
}
cflags = io_put_kbufs(req, io_bundle_nbufs(kmsg, *ret), issue_flags);
cflags = io_put_kbufs(req, *ret, io_bundle_nbufs(kmsg, *ret), issue_flags);
if (bundle_finished || req->flags & REQ_F_BL_EMPTY)
goto finish;
@ -599,7 +597,7 @@ retry_bundle:
if (io_do_buffer_select(req)) {
struct buf_sel_arg arg = {
.iovs = &kmsg->fast_iov,
.max_len = INT_MAX,
.max_len = min_not_zero(sr->len, INT_MAX),
.nr_iovs = 1,
};
@ -618,14 +616,23 @@ retry_bundle:
if (unlikely(ret < 0))
return ret;
sr->len = arg.out_len;
iov_iter_init(&kmsg->msg.msg_iter, ITER_SOURCE, arg.iovs, ret,
arg.out_len);
if (arg.iovs != &kmsg->fast_iov && arg.iovs != kmsg->free_iov) {
kmsg->free_iov_nr = ret;
kmsg->free_iov = arg.iovs;
req->flags |= REQ_F_NEED_CLEANUP;
}
sr->len = arg.out_len;
if (ret == 1) {
sr->buf = arg.iovs[0].iov_base;
ret = import_ubuf(ITER_SOURCE, sr->buf, sr->len,
&kmsg->msg.msg_iter);
if (unlikely(ret))
return ret;
} else {
iov_iter_init(&kmsg->msg.msg_iter, ITER_SOURCE,
arg.iovs, ret, arg.out_len);
}
}
/*
@ -835,13 +842,13 @@ static inline bool io_recv_finish(struct io_kiocb *req, int *ret,
cflags |= IORING_CQE_F_SOCK_NONEMPTY;
if (sr->flags & IORING_RECVSEND_BUNDLE) {
cflags |= io_put_kbufs(req, io_bundle_nbufs(kmsg, *ret),
cflags |= io_put_kbufs(req, *ret, io_bundle_nbufs(kmsg, *ret),
issue_flags);
/* bundle with no more immediate buffers, we're done */
if (req->flags & REQ_F_BL_EMPTY)
goto finish;
} else {
cflags |= io_put_kbuf(req, issue_flags);
cflags |= io_put_kbuf(req, *ret, issue_flags);
}
/*

95
io_uring/register.c
View File

@ -335,6 +335,31 @@ err:
return ret;
}
static int io_register_clock(struct io_ring_ctx *ctx,
struct io_uring_clock_register __user *arg)
{
struct io_uring_clock_register reg;
if (copy_from_user(&reg, arg, sizeof(reg)))
return -EFAULT;
if (memchr_inv(&reg.__resv, 0, sizeof(reg.__resv)))
return -EINVAL;
switch (reg.clockid) {
case CLOCK_MONOTONIC:
ctx->clock_offset = 0;
break;
case CLOCK_BOOTTIME:
ctx->clock_offset = TK_OFFS_BOOT;
break;
default:
return -EINVAL;
}
ctx->clockid = reg.clockid;
return 0;
}
static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
void __user *arg, unsigned nr_args)
__releases(ctx->uring_lock)
@ -511,6 +536,18 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
break;
ret = io_unregister_napi(ctx, arg);
break;
case IORING_REGISTER_CLOCK:
ret = -EINVAL;
if (!arg || nr_args)
break;
ret = io_register_clock(ctx, arg);
break;
case IORING_REGISTER_COPY_BUFFERS:
ret = -EINVAL;
if (!arg || nr_args != 1)
break;
ret = io_register_copy_buffers(ctx, arg);
break;
default:
ret = -EINVAL;
break;
@ -519,6 +556,38 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
return ret;
}
/*
* Given an 'fd' value, return the ctx associated with if. If 'registered' is
* true, then the registered index is used. Otherwise, the normal fd table.
* Caller must call fput() on the returned file, unless it's an ERR_PTR.
*/
struct file *io_uring_register_get_file(int fd, bool registered)
{
struct file *file;
if (registered) {
/*
* Ring fd has been registered via IORING_REGISTER_RING_FDS, we
* need only dereference our task private array to find it.
*/
struct io_uring_task *tctx = current->io_uring;
if (unlikely(!tctx || fd >= IO_RINGFD_REG_MAX))
return ERR_PTR(-EINVAL);
fd = array_index_nospec(fd, IO_RINGFD_REG_MAX);
file = tctx->registered_rings[fd];
} else {
file = fget(fd);
}
if (unlikely(!file))
return ERR_PTR(-EBADF);
if (io_is_uring_fops(file))
return file;
fput(file);
return ERR_PTR(-EOPNOTSUPP);
}
SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode,
void __user *, arg, unsigned int, nr_args)
{
@ -533,35 +602,15 @@ SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode,
if (opcode >= IORING_REGISTER_LAST)
return -EINVAL;
if (use_registered_ring) {
/*
* Ring fd has been registered via IORING_REGISTER_RING_FDS, we
* need only dereference our task private array to find it.
*/
struct io_uring_task *tctx = current->io_uring;
if (unlikely(!tctx || fd >= IO_RINGFD_REG_MAX))
return -EINVAL;
fd = array_index_nospec(fd, IO_RINGFD_REG_MAX);
file = tctx->registered_rings[fd];
if (unlikely(!file))
return -EBADF;
} else {
file = fget(fd);
if (unlikely(!file))
return -EBADF;
ret = -EOPNOTSUPP;
if (!io_is_uring_fops(file))
goto out_fput;
}
file = io_uring_register_get_file(fd, use_registered_ring);
if (IS_ERR(file))
return PTR_ERR(file);
ctx = file->private_data;
mutex_lock(&ctx->uring_lock);
ret = __io_uring_register(ctx, opcode, arg, nr_args);
mutex_unlock(&ctx->uring_lock);
trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs, ret);
out_fput:
if (!use_registered_ring)
fput(file);
return ret;

1
io_uring/register.h
View File

@ -4,5 +4,6 @@
int io_eventfd_unregister(struct io_ring_ctx *ctx);
int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id);
struct file *io_uring_register_get_file(int fd, bool registered);
#endif

245
io_uring/rsrc.c
View File

@ -17,6 +17,7 @@
#include "openclose.h"
#include "rsrc.h"
#include "memmap.h"
#include "register.h"
struct io_rsrc_update {
struct file *file;
@ -114,14 +115,16 @@ static void io_buffer_unmap(struct io_ring_ctx *ctx, struct io_mapped_ubuf **slo
struct io_mapped_ubuf *imu = *slot;
unsigned int i;
*slot = NULL;
if (imu != &dummy_ubuf) {
if (!refcount_dec_and_test(&imu->refs))
return;
for (i = 0; i < imu->nr_bvecs; i++)
unpin_user_page(imu->bvec[i].bv_page);
if (imu->acct_pages)
io_unaccount_mem(ctx, imu->acct_pages);
kvfree(imu);
}
*slot = NULL;
}
static void io_rsrc_put_work(struct io_rsrc_node *node)
@ -855,6 +858,98 @@ static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages,
return ret;
}
static bool io_do_coalesce_buffer(struct page ***pages, int *nr_pages,
struct io_imu_folio_data *data, int nr_folios)
{
struct page **page_array = *pages, **new_array = NULL;
int nr_pages_left = *nr_pages, i, j;
/* Store head pages only*/
new_array = kvmalloc_array(nr_folios, sizeof(struct page *),
GFP_KERNEL);
if (!new_array)
return false;
new_array[0] = compound_head(page_array[0]);
/*
* The pages are bound to the folio, it doesn't
* actually unpin them but drops all but one reference,
* which is usually put down by io_buffer_unmap().
* Note, needs a better helper.
*/
if (data->nr_pages_head > 1)
unpin_user_pages(&page_array[1], data->nr_pages_head - 1);
j = data->nr_pages_head;
nr_pages_left -= data->nr_pages_head;
for (i = 1; i < nr_folios; i++) {
unsigned int nr_unpin;
new_array[i] = page_array[j];
nr_unpin = min_t(unsigned int, nr_pages_left - 1,
data->nr_pages_mid - 1);
if (nr_unpin)
unpin_user_pages(&page_array[j+1], nr_unpin);
j += data->nr_pages_mid;
nr_pages_left -= data->nr_pages_mid;
}
kvfree(page_array);
*pages = new_array;
*nr_pages = nr_folios;
return true;
}
static bool io_try_coalesce_buffer(struct page ***pages, int *nr_pages,
struct io_imu_folio_data *data)
{
struct page **page_array = *pages;
struct folio *folio = page_folio(page_array[0]);
unsigned int count = 1, nr_folios = 1;
int i;
if (*nr_pages <= 1)
return false;
data->nr_pages_mid = folio_nr_pages(folio);
if (data->nr_pages_mid == 1)
return false;
data->folio_shift = folio_shift(folio);
/*
* Check if pages are contiguous inside a folio, and all folios have
* the same page count except for the head and tail.
*/
for (i = 1; i < *nr_pages; i++) {
if (page_folio(page_array[i]) == folio &&
page_array[i] == page_array[i-1] + 1) {
count++;
continue;
}
if (nr_folios == 1) {
if (folio_page_idx(folio, page_array[i-1]) !=
data->nr_pages_mid - 1)
return false;
data->nr_pages_head = count;
} else if (count != data->nr_pages_mid) {
return false;
}
folio = page_folio(page_array[i]);
if (folio_size(folio) != (1UL << data->folio_shift) ||
folio_page_idx(folio, page_array[i]) != 0)
return false;
count = 1;
nr_folios++;
}
if (nr_folios == 1)
data->nr_pages_head = count;
return io_do_coalesce_buffer(pages, nr_pages, data, nr_folios);
}
static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov,
struct io_mapped_ubuf **pimu,
struct page **last_hpage)
@ -864,7 +959,8 @@ static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov,
unsigned long off;
size_t size;
int ret, nr_pages, i;
struct folio *folio = NULL;
struct io_imu_folio_data data;
bool coalesced;
*pimu = (struct io_mapped_ubuf *)&dummy_ubuf;
if (!iov->iov_base)
@ -879,31 +975,8 @@ static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov,
goto done;
}
/* If it's a huge page, try to coalesce them into a single bvec entry */
if (nr_pages > 1) {
folio = page_folio(pages[0]);
for (i = 1; i < nr_pages; i++) {
/*
* Pages must be consecutive and on the same folio for
* this to work
*/
if (page_folio(pages[i]) != folio ||
pages[i] != pages[i - 1] + 1) {
folio = NULL;
break;
}
}
if (folio) {
/*
* The pages are bound to the folio, it doesn't
* actually unpin them but drops all but one reference,
* which is usually put down by io_buffer_unmap().
* Note, needs a better helper.
*/
unpin_user_pages(&pages[1], nr_pages - 1);
nr_pages = 1;
}
}
/* If it's huge page(s), try to coalesce them into fewer bvec entries */
coalesced = io_try_coalesce_buffer(&pages, &nr_pages, &data);
imu = kvmalloc(struct_size(imu, bvec, nr_pages), GFP_KERNEL);
if (!imu)
@ -915,23 +988,26 @@ static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov,
goto done;
}
off = (unsigned long) iov->iov_base & ~PAGE_MASK;
size = iov->iov_len;
/* store original address for later verification */
imu->ubuf = (unsigned long) iov->iov_base;
imu->ubuf_end = imu->ubuf + iov->iov_len;
imu->nr_bvecs = nr_pages;
imu->folio_shift = PAGE_SHIFT;
imu->folio_mask = PAGE_MASK;
if (coalesced) {
imu->folio_shift = data.folio_shift;
imu->folio_mask = ~((1UL << data.folio_shift) - 1);
}
refcount_set(&imu->refs, 1);
off = (unsigned long) iov->iov_base & ~imu->folio_mask;
*pimu = imu;
ret = 0;
if (folio) {
bvec_set_page(&imu->bvec[0], pages[0], size, off);
goto done;
}
for (i = 0; i < nr_pages; i++) {
size_t vec_len;
vec_len = min_t(size_t, size, PAGE_SIZE - off);
vec_len = min_t(size_t, size, (1UL << imu->folio_shift) - off);
bvec_set_page(&imu->bvec[i], pages[i], vec_len, off);
off = 0;
size -= vec_len;
@ -1042,23 +1118,18 @@ int io_import_fixed(int ddir, struct iov_iter *iter,
* we know that:
*
* 1) it's a BVEC iter, we set it up
* 2) all bvecs are PAGE_SIZE in size, except potentially the
* 2) all bvecs are the same in size, except potentially the
* first and last bvec
*
* So just find our index, and adjust the iterator afterwards.
* If the offset is within the first bvec (or the whole first
* bvec, just use iov_iter_advance(). This makes it easier
* since we can just skip the first segment, which may not
* be PAGE_SIZE aligned.
* be folio_size aligned.
*/
const struct bio_vec *bvec = imu->bvec;
if (offset < bvec->bv_len) {
/*
* Note, huge pages buffers consists of one large
* bvec entry and should always go this way. The other
* branch doesn't expect non PAGE_SIZE'd chunks.
*/
iter->bvec = bvec;
iter->count -= offset;
iter->iov_offset = offset;
@ -1067,14 +1138,104 @@ int io_import_fixed(int ddir, struct iov_iter *iter,
/* skip first vec */
offset -= bvec->bv_len;
seg_skip = 1 + (offset >> PAGE_SHIFT);
seg_skip = 1 + (offset >> imu->folio_shift);
iter->bvec = bvec + seg_skip;
iter->nr_segs -= seg_skip;
iter->count -= bvec->bv_len + offset;
iter->iov_offset = offset & ~PAGE_MASK;
iter->iov_offset = offset & ~imu->folio_mask;
}
}
return 0;
}
static int io_copy_buffers(struct io_ring_ctx *ctx, struct io_ring_ctx *src_ctx)
{
struct io_mapped_ubuf **user_bufs;
struct io_rsrc_data *data;
int i, ret, nbufs;
/*
* Drop our own lock here. We'll setup the data we need and reference
* the source buffers, then re-grab, check, and assign at the end.
*/
mutex_unlock(&ctx->uring_lock);
mutex_lock(&src_ctx->uring_lock);
ret = -ENXIO;
nbufs = src_ctx->nr_user_bufs;
if (!nbufs)
goto out_unlock;
ret = io_rsrc_data_alloc(ctx, IORING_RSRC_BUFFER, NULL, nbufs, &data);
if (ret)
goto out_unlock;
ret = -ENOMEM;
user_bufs = kcalloc(nbufs, sizeof(*ctx->user_bufs), GFP_KERNEL);
if (!user_bufs)
goto out_free_data;
for (i = 0; i < nbufs; i++) {
struct io_mapped_ubuf *src = src_ctx->user_bufs[i];
refcount_inc(&src->refs);
user_bufs[i] = src;
}
/* Have a ref on the bufs now, drop src lock and re-grab our own lock */
mutex_unlock(&src_ctx->uring_lock);
mutex_lock(&ctx->uring_lock);
if (!ctx->user_bufs) {
ctx->user_bufs = user_bufs;
ctx->buf_data = data;
ctx->nr_user_bufs = nbufs;
return 0;
}
/* someone raced setting up buffers, dump ours */
for (i = 0; i < nbufs; i++)
io_buffer_unmap(ctx, &user_bufs[i]);
io_rsrc_data_free(data);
kfree(user_bufs);
return -EBUSY;
out_free_data:
io_rsrc_data_free(data);
out_unlock:
mutex_unlock(&src_ctx->uring_lock);
mutex_lock(&ctx->uring_lock);
return ret;
}
/*
* Copy the registered buffers from the source ring whose file descriptor
* is given in the src_fd to the current ring. This is identical to registering
* the buffers with ctx, except faster as mappings already exist.
*
* Since the memory is already accounted once, don't account it again.
*/
int io_register_copy_buffers(struct io_ring_ctx *ctx, void __user *arg)
{
struct io_uring_copy_buffers buf;
bool registered_src;
struct file *file;
int ret;
if (ctx->user_bufs || ctx->nr_user_bufs)
return -EBUSY;
if (copy_from_user(&buf, arg, sizeof(buf)))
return -EFAULT;
if (buf.flags & ~IORING_REGISTER_SRC_REGISTERED)
return -EINVAL;
if (memchr_inv(buf.pad, 0, sizeof(buf.pad)))
return -EINVAL;
registered_src = (buf.flags & IORING_REGISTER_SRC_REGISTERED) != 0;
file = io_uring_register_get_file(buf.src_fd, registered_src);
if (IS_ERR(file))
return PTR_ERR(file);
ret = io_copy_buffers(ctx, file->private_data);
if (!registered_src)
fput(file);
return ret;
}

14
io_uring/rsrc.h
View File

@ -22,8 +22,6 @@ struct io_rsrc_put {
};
};
typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc);
struct io_rsrc_data {
struct io_ring_ctx *ctx;
@ -46,10 +44,21 @@ struct io_mapped_ubuf {
u64 ubuf;
u64 ubuf_end;
unsigned int nr_bvecs;
unsigned int folio_shift;
unsigned long acct_pages;
unsigned long folio_mask;
refcount_t refs;
struct bio_vec bvec[] __counted_by(nr_bvecs);
};
struct io_imu_folio_data {
/* Head folio can be partially included in the fixed buf */
unsigned int nr_pages_head;
/* For non-head/tail folios, has to be fully included */
unsigned int nr_pages_mid;
unsigned int folio_shift;
};
void io_rsrc_node_ref_zero(struct io_rsrc_node *node);
void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *ref_node);
struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx);
@ -59,6 +68,7 @@ int io_import_fixed(int ddir, struct iov_iter *iter,
struct io_mapped_ubuf *imu,
u64 buf_addr, size_t len);
int io_register_copy_buffers(struct io_ring_ctx *ctx, void __user *arg);
void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,

19
io_uring/rw.c
View File

@ -467,8 +467,7 @@ static void io_req_io_end(struct io_kiocb *req)
static bool __io_complete_rw_common(struct io_kiocb *req, long res)
{
if (unlikely(res != req->cqe.res)) {
if ((res == -EAGAIN || res == -EOPNOTSUPP) &&
io_rw_should_reissue(req)) {
if (res == -EAGAIN && io_rw_should_reissue(req)) {
/*
* Reissue will start accounting again, finish the
* current cycle.
@ -511,7 +510,7 @@ void io_req_rw_complete(struct io_kiocb *req, struct io_tw_state *ts)
io_req_io_end(req);
if (req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING))
req->cqe.flags |= io_put_kbuf(req, 0);
req->cqe.flags |= io_put_kbuf(req, req->cqe.res, 0);
io_req_rw_cleanup(req, 0);
io_req_task_complete(req, ts);
@ -593,7 +592,7 @@ static int kiocb_done(struct io_kiocb *req, ssize_t ret,
*/
io_req_io_end(req);
io_req_set_res(req, final_ret,
io_put_kbuf(req, issue_flags));
io_put_kbuf(req, ret, issue_flags));
io_req_rw_cleanup(req, issue_flags);
return IOU_OK;
}
@ -855,6 +854,14 @@ static int __io_read(struct io_kiocb *req, unsigned int issue_flags)
ret = io_iter_do_read(rw, &io->iter);
/*
* Some file systems like to return -EOPNOTSUPP for an IOCB_NOWAIT
* issue, even though they should be returning -EAGAIN. To be safe,
* retry from blocking context for either.
*/
if (ret == -EOPNOTSUPP && force_nonblock)
ret = -EAGAIN;
if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) {
req->flags &= ~REQ_F_REISSUE;
/* If we can poll, just do that. */
@ -975,7 +982,7 @@ int io_read_mshot(struct io_kiocb *req, unsigned int issue_flags)
* Put our buffer and post a CQE. If we fail to post a CQE, then
* jump to the termination path. This request is then done.
*/
cflags = io_put_kbuf(req, issue_flags);
cflags = io_put_kbuf(req, ret, issue_flags);
rw->len = 0; /* similarly to above, reset len to 0 */
if (io_req_post_cqe(req, ret, cflags | IORING_CQE_F_MORE)) {
@ -1167,7 +1174,7 @@ int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin)
if (!smp_load_acquire(&req->iopoll_completed))
break;
nr_events++;
req->cqe.flags = io_put_kbuf(req, 0);
req->cqe.flags = io_put_kbuf(req, req->cqe.res, 0);
if (req->opcode != IORING_OP_URING_CMD)
io_req_rw_cleanup(req, 0);
}

7
io_uring/sqpoll.c
View File

@ -10,6 +10,7 @@
#include <linux/slab.h>
#include <linux/audit.h>
#include <linux/security.h>
#include <linux/cpuset.h>
#include <linux/io_uring.h>
#include <uapi/linux/io_uring.h>
@ -176,7 +177,7 @@ static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries)
if (cap_entries && to_submit > IORING_SQPOLL_CAP_ENTRIES_VALUE)
to_submit = IORING_SQPOLL_CAP_ENTRIES_VALUE;
if (!wq_list_empty(&ctx->iopoll_list) || to_submit) {
if (to_submit || !wq_list_empty(&ctx->iopoll_list)) {
const struct cred *creds = NULL;
if (ctx->sq_creds != current_cred())
@ -460,10 +461,12 @@ __cold int io_sq_offload_create(struct io_ring_ctx *ctx,
return 0;
if (p->flags & IORING_SETUP_SQ_AFF) {
struct cpumask allowed_mask;
int cpu = p->sq_thread_cpu;
ret = -EINVAL;
if (cpu >= nr_cpu_ids || !cpu_online(cpu))
cpuset_cpus_allowed(current, &allowed_mask);
if (!cpumask_test_cpu(cpu, &allowed_mask))
goto err_sqpoll;
sqd->sq_cpu = cpu;
} else {