io_poll_issue() forwards the call to io_issue_sqe() and thus inherits
some of the handling. That's not particularly failure resistant, as for
example returning an innocently looking IOU_OK from a multishot issue
will lead to severe bugs.
Reimplement io_poll_issue() without io_issue_sqe()'s request completion
logic. Remove extra checks as we know that req->file is already set,
linked timeout are armed, and iopoll is not supported. Also cover it
with warnings for now.
The patch should be useful by itself, but it's also preparing the
codebase for other future clean ups.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/3096d7b1026d9a52426a598bdfc8d9d324555545.1740331076.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
REQ_F_APOLL_MULTISHOT doesn't guarantee it's executed from the multishot
context, so a multishot accept may get executed inline, fail
io_req_post_cqe(), and ask the core code to kill the request with
-ECANCELED by returning IOU_STOP_MULTISHOT even when a socket has been
accepted and installed.
Cc: stable@vger.kernel.org
Fixes: 390ed29b5e ("io_uring: add IORING_ACCEPT_MULTISHOT for accept")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/51c6deb01feaa78b08565ca8f24843c017f5bc80.1740331076.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Even when COMPAT is compiled out, we still have to pass
ctx->compat to __import_iovec(). Replace the read with an indirection
with a constant when the kernel doesn't support compat.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Anuj Gupta <anuj20.g@samsung.com>
Link: https://lore.kernel.org/r/2819df9c8533c36b46d7baccbb317a0ec89da6cd.1740400452.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
io_uring_create() computes ctx->lockless_cq as:
ctx->task_complete || (ctx->flags & IORING_SETUP_IOPOLL)
So use it to simplify that expression in io_req_complete_post().
Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Reviewed-by: Li Zetao <lizetao1@huawei.com>
Link: https://lore.kernel.org/r/20250212005119.3433005-1-csander@purestorage.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
8e5b3b89ec ("io_uring: remove struct io_tw_state::locked") removed the
only field of io_tw_state but kept it as a task work callback argument
to "forc[e] users not to invoke them carelessly out of a wrong context".
Passing the struct io_tw_state * argument adds a few instructions to all
callers that can't inline the functions and see the argument is unused.
So pass struct io_tw_state by value instead. Since it's a 0-sized value,
it can be passed without any instructions needed to initialize it.
Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Link: https://lore.kernel.org/r/20250217022511.1150145-2-csander@purestorage.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
In preparation for changing how io_tw_state is passed, introduce a type
alias io_tw_token_t for struct io_tw_state *. This allows for changing
the representation in one place, without having to update the many
functions that just forward their struct io_tw_state * argument.
Also add a comment to struct io_tw_state to explain its purpose.
Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Link: https://lore.kernel.org/r/20250217022511.1150145-1-csander@purestorage.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Most callers of io_put_rsrc_node() already check that node is non-NULL:
- io_rsrc_data_free()
- io_sqe_buffer_register()
- io_reset_rsrc_node()
- io_req_put_rsrc_nodes() (REQ_F_BUF_NODE indicates non-NULL buf_node)
Only io_splice_cleanup() can call io_put_rsrc_node() with a NULL node.
So move the NULL check there.
Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Link: https://lore.kernel.org/r/20250216225900.1075446-1-csander@purestorage.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
io_init_req_drain() takes a struct io_kiocb *req argument but only uses
it to get struct io_ring_ctx *ctx. The caller already knows the ctx, so
pass it instead.
Drop "req" from the function name since it operates on the ctx rather
than a specific req.
Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Link: https://lore.kernel.org/r/20250212164807.3681036-1-csander@purestorage.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Current recv bundles are only supported for multishot receives, and
additionally they also always post at least 2 CQEs if more data is
available than what a buffer will hold. This happens because the initial
bundle recv will do a single buffer, and then do the rest of what is in
the socket as a followup receive. As shown in a test program, if 1k
buffers are available and 32k is available to receive in the socket,
you'd get the following completions:
bundle=1, mshot=0
cqe res 1024
cqe res 1024
[...]
cqe res 1024
bundle=1, mshot=1
cqe res 1024
cqe res 31744
where bundle=1 && mshot=0 will post 32 1k completions, and bundle=1 &&
mshot=1 will post a 1k completion and then a 31k completion.
To support bundle recv without multishot, it's possible to simply retry
the recv immediately and post a single completion, rather than split it
into two completions. With the below patch, the same test looks as
follows:
bundle=1, mshot=0
cqe res 32768
bundle=1, mshot=1
cqe res 32768
where mshot=0 works fine for bundles, and both of them post just a
single 32k completion rather than split it into separate completions.
Posting fewer completions is always a nice win, and not needing
multishot for proper bundle efficiency is nice for cases that can't
necessarily use multishot.
Reported-by: Norman Maurer <norman_maurer@apple.com>
Link: https://lore.kernel.org/r/184f9f92-a682-4205-a15d-89e18f664502@kernel.dk
Fixes: 2f9c9515bd ("io_uring/net: support bundles for recv")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Don't implement our own loop rolling and checking, just use the generic
helper to find and cancel requests.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Don't implement our own loop rolling and checking, just use the generic
helper to find and cancel requests.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Any opcode that is cancelable ends up defining its own cancel helper
for finding and canceling a specific request. Add a generic helper that
can be used for this purpose.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Any opcode that is cancelable ends up defining its own remove all
helper, which iterates the pending list and cancels matches. Add a
generic helper for it, which can be used by them.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
__io_put_kbufs() and other helper functions are too large to be inlined,
compilers would normally refuse to do so. Uninline it and move together
with io_kbuf_commit into kbuf.c.
io_kbuf_commitSigned-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/3dade7f55ad590e811aff83b1ec55c9c04e17b2b.1738724373.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
io_kbuf_drop() is only used for legacy provided buffers, and so
__io_put_kbuf_list() is never called for REQ_F_BUFFER_RING. Remove the
dead branch out of __io_put_kbuf_list(), rename it into
io_kbuf_drop_legacy() and use it directly instead of io_kbuf_drop().
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/c8cc73e2272f09a86ecbdad9ebdd8304f8e583c0.1738724373.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
As a preparation step remove an optimisation from __io_put_kbuf() trying
to use the locked cache. With that __io_put_kbuf_list() is only used
with ->io_buffers_comp, and we remove the explicit list argument.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/1b7f1394ec4afc7f96b35a61f5992e27c49fd067.1738724373.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Previously, the `hash` variable was initialized with `-1` and only
updated by io_get_next_work() if the current work was hashed. Commit
60cf46ae60 ("io-wq: hash dependent work") changed this to always
call io_get_work_hash() even if the work was not hashed. This caused
the `hash != -1U` check to always be true, adding some overhead for
the `hash->wait` code.
This patch fixes the regression by checking the `IO_WQ_WORK_HASHED`
flag.
Perf diff for a flood of `IORING_OP_NOP` with `IOSQE_ASYNC`:
38.55% -1.57% [kernel.kallsyms] [k] queued_spin_lock_slowpath
6.86% -0.72% [kernel.kallsyms] [k] io_worker_handle_work
0.10% +0.67% [kernel.kallsyms] [k] put_prev_entity
1.96% +0.59% [kernel.kallsyms] [k] io_nop_prep
3.31% -0.51% [kernel.kallsyms] [k] try_to_wake_up
7.18% -0.47% [kernel.kallsyms] [k] io_wq_free_work
Fixes: 60cf46ae60 ("io-wq: hash dependent work")
Cc: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
Link: https://lore.kernel.org/r/20250128133927.3989681-6-max.kellermann@ionos.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Have separate linked lists for bounded and unbounded workers. This
way, io_acct_activate_free_worker() sees only workers relevant to it
and doesn't need to skip irrelevant ones. This speeds up the
linked list traversal (under acct->lock).
The `io_wq.lock` field is moved to `io_wq_acct.workers_lock`. It did
not actually protect "access to elements below", that is, not all of
them; it only protected access to the worker lists. By having two
locks instead of one, contention on this lock is reduced.
Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
Link: https://lore.kernel.org/r/20250128133927.3989681-4-max.kellermann@ionos.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This replaces the `IO_WORKER_F_BOUND` flag. All code that checks this
flag is not interested in knowing whether this is a "bound" worker;
all it does with this flag is determine the `io_wq_acct` pointer. At
the cost of an extra pointer field, we can eliminate some fragile
pointer arithmetic. In turn, the `create_index` and `index` fields
are not needed anymore.
Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
Link: https://lore.kernel.org/r/20250128133927.3989681-3-max.kellermann@ionos.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Instead of calling io_work_get_acct() again, pass acct to
io_wq_insert_work() and io_wq_remove_pending().
This atomic access in io_work_get_acct() was done under the
`acct->lock`, and optimizing it away reduces lock contention a bit.
Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
Link: https://lore.kernel.org/r/20250128133927.3989681-2-max.kellermann@ionos.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
- Fix annoying logs when building tools in parallel
- Fix the Debian linux-headers package build again
- Fix the target triple detection for userspace programs on Clang
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Merge tag 'kbuild-fixes-v6.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
Pull Kbuild fixes from Masahiro Yamada:
- Fix annoying logs when building tools in parallel
- Fix the Debian linux-headers package build again
- Fix the target triple detection for userspace programs on Clang
* tag 'kbuild-fixes-v6.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
modpost: Fix a few typos in a comment
kbuild: userprogs: fix bitsize and target detection on clang
kbuild: fix linux-headers package build when $(CC) cannot link userspace
tools: fix annoying "mkdir -p ..." logs when building tools in parallel
Here is a driver core new api for 6.14-rc3 that is being added to allow
platform devices from stop being abused. It adds a new "faux_device"
structure and bus and api to allow almost a straight or simpler
conversion from platform devices that were not really a platform device.
It also comes with a binding for rust, with an example driver in rust
showing how it's used.
I'm adding this now so that the patches that convert the different
drivers and subsystems can all start flowing into linux-next now through
their different development trees, in time for 6.15-rc1. We have a
number that are already reviewed and tested, but adding those
conversions now doesn't seem right. For now, no one is using this, and
it passes all build tests from 0-day and linux-next, so all should be
good.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-6.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core api addition from Greg KH:
"Here is a driver core new api for 6.14-rc3 that is being added to
allow platform devices from stop being abused.
It adds a new 'faux_device' structure and bus and api to allow almost
a straight or simpler conversion from platform devices that were not
really a platform device. It also comes with a binding for rust, with
an example driver in rust showing how it's used.
I'm adding this now so that the patches that convert the different
drivers and subsystems can all start flowing into linux-next now
through their different development trees, in time for 6.15-rc1.
We have a number that are already reviewed and tested, but adding
those conversions now doesn't seem right. For now, no one is using
this, and it passes all build tests from 0-day and linux-next, so all
should be good"
* tag 'driver-core-6.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
rust/kernel: Add faux device bindings
driver core: add a faux bus for use when a simple device/bus is needed
Here are some small serial driver fixes for some reported problems for
6.14-rc3. Nothing major, just:
- sc16is7xx irq check fix
- 8250 fifo underflow fix
- serial_port and 8250 iotype fixes
Most of these have been in linux-next already, and all have passed 0-day
testing.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'tty-6.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Pull serial driver fixes from Greg KH:
"Here are some small serial driver fixes for some reported problems.
Nothing major, just:
- sc16is7xx irq check fix
- 8250 fifo underflow fix
- serial_port and 8250 iotype fixes
Most of these have been in linux-next already, and all have passed
0-day testing"
* tag 'tty-6.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
serial: 8250: Fix fifo underflow on flush
serial: 8250_pnp: Remove unneeded ->iotype assignment
serial: 8250_platform: Remove unneeded ->iotype assignment
serial: 8250_of: Remove unneeded ->iotype assignment
serial: port: Make ->iotype validation global in __uart_read_properties()
serial: port: Always update ->iotype in __uart_read_properties()
serial: port: Assign ->iotype correctly when ->iobase is set
serial: sc16is7xx: Fix IRQ number check behavior
Here are some small USB driver fixes, and new device ids, for 6.14-rc3.
Lots of tiny stuff for reported problems, including:
- new device ids and quirks
- usb hub crash fix found by syzbot
- dwc2 driver fix
- dwc3 driver fixes
- uvc gadget driver fix
- cdc-acm driver fixes for a variety of different issues
- other tiny bugfixes
Almost all of these have been in linux-next this week, and all have
passed 0-day testing.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'usb-6.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Pull USB fixes from Greg KH:
"Here are some small USB driver fixes, and new device ids, for
6.14-rc3. Lots of tiny stuff for reported problems, including:
- new device ids and quirks
- usb hub crash fix found by syzbot
- dwc2 driver fix
- dwc3 driver fixes
- uvc gadget driver fix
- cdc-acm driver fixes for a variety of different issues
- other tiny bugfixes
Almost all of these have been in linux-next this week, and all have
passed 0-day testing"
* tag 'usb-6.14-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (25 commits)
usb: typec: tcpm: PSSourceOffTimer timeout in PR_Swap enters ERROR_RECOVERY
usb: roles: set switch registered flag early on
usb: gadget: uvc: Fix unstarted kthread worker
USB: quirks: add USB_QUIRK_NO_LPM quirk for Teclast dist
usb: gadget: core: flush gadget workqueue after device removal
USB: gadget: f_midi: f_midi_complete to call queue_work
usb: core: fix pipe creation for get_bMaxPacketSize0
usb: dwc3: Fix timeout issue during controller enter/exit from halt state
USB: Add USB_QUIRK_NO_LPM quirk for sony xperia xz1 smartphone
USB: cdc-acm: Fill in Renesas R-Car D3 USB Download mode quirk
usb: cdc-acm: Fix handling of oversized fragments
usb: cdc-acm: Check control transfer buffer size before access
usb: xhci: Restore xhci_pci support for Renesas HCs
USB: pci-quirks: Fix HCCPARAMS register error for LS7A EHCI
USB: serial: option: drop MeiG Smart defines
USB: serial: option: fix Telit Cinterion FN990A name
USB: serial: option: add Telit Cinterion FN990B compositions
USB: serial: option: add MeiG Smart SLM828
usb: gadget: f_midi: fix MIDI Streaming descriptor lengths
usb: dwc2: gadget: remove of_node reference upon udc_stop
...
handoff to the OS
- Check CPUID(0x23) leaf and subleafs presence properly
- Remove the PEBS-via-PT feature from being supported on hybrid systems
- Fix perf record/top default commands on systems without a raw PMU registered
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Merge tag 'perf_urgent_for_v6.14_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 perf fixes from Borislav Petkov:
- Explicitly clear DEBUGCTL.LBR to prevent LBRs continuing being
enabled after handoff to the OS
- Check CPUID(0x23) leaf and subleafs presence properly
- Remove the PEBS-via-PT feature from being supported on hybrid systems
- Fix perf record/top default commands on systems without a raw PMU
registered
* tag 'perf_urgent_for_v6.14_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/x86/intel: Ensure LBRs are disabled when a CPU is starting
perf/x86/intel: Fix ARCH_PERFMON_NUM_COUNTER_LEAF
perf/x86/intel: Clean up PEBS-via-PT on hybrid
perf/x86/rapl: Fix the error checking order
clear its removal from that queue is atomic
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Merge tag 'sched_urgent_for_v6.14_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler fix from Borislav Petkov:
- Clarify what happens when a task is woken up from the wake queue and
make clear its removal from that queue is atomic
* tag 'sched_urgent_for_v6.14_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
sched: Clarify wake_up_q()'s write to task->wake_q.next
breakage has been fixed in the meantime
- Teach objtool to ignore dangling jump table entries added by Clang
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Merge tag 'objtool_urgent_for_v6.14_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull objtool fixes from Borislav Petkov:
- Move a warning about a lld.ld breakage into the verbose setting as
said breakage has been fixed in the meantime
- Teach objtool to ignore dangling jump table entries added by Clang
* tag 'objtool_urgent_for_v6.14_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
objtool: Move dodgy linker warn to verbose
objtool: Ignore dangling jump table entries
- Large set of fixes for vector handling, specially in the interactions
between host and guest state. This fixes a number of bugs affecting
actual deployments, and greatly simplifies the FP/SIMD/SVE handling.
Thanks to Mark Rutland for dealing with this thankless task.
- Fix an ugly race between vcpu and vgic creation/init, resulting in
unexpected behaviours.
- Fix use of kernel VAs at EL2 when emulating timers with nVHE.
- Small set of pKVM improvements and cleanups.
x86:
- Fix broken SNP support with KVM module built-in, ensuring the PSP
module is initialized before KVM even when the module infrastructure
cannot be used to order initcalls
- Reject Hyper-V SEND_IPI hypercalls if the local APIC isn't being emulated
by KVM to fix a NULL pointer dereference.
- Enter guest mode (L2) from KVM's perspective before initializing the vCPU's
nested NPT MMU so that the MMU is properly tagged for L2, not L1.
- Load the guest's DR6 outside of the innermost .vcpu_run() loop, as the
guest's value may be stale if a VM-Exit is handled in the fastpath.
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull kvm fixes from Paolo Bonzini:
"ARM:
- Large set of fixes for vector handling, especially in the
interactions between host and guest state.
This fixes a number of bugs affecting actual deployments, and
greatly simplifies the FP/SIMD/SVE handling. Thanks to Mark Rutland
for dealing with this thankless task.
- Fix an ugly race between vcpu and vgic creation/init, resulting in
unexpected behaviours
- Fix use of kernel VAs at EL2 when emulating timers with nVHE
- Small set of pKVM improvements and cleanups
x86:
- Fix broken SNP support with KVM module built-in, ensuring the PSP
module is initialized before KVM even when the module
infrastructure cannot be used to order initcalls
- Reject Hyper-V SEND_IPI hypercalls if the local APIC isn't being
emulated by KVM to fix a NULL pointer dereference
- Enter guest mode (L2) from KVM's perspective before initializing
the vCPU's nested NPT MMU so that the MMU is properly tagged for
L2, not L1
- Load the guest's DR6 outside of the innermost .vcpu_run() loop, as
the guest's value may be stale if a VM-Exit is handled in the
fastpath"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (25 commits)
x86/sev: Fix broken SNP support with KVM module built-in
KVM: SVM: Ensure PSP module is initialized if KVM module is built-in
crypto: ccp: Add external API interface for PSP module initialization
KVM: arm64: vgic: Hoist SGI/PPI alloc from vgic_init() to kvm_create_vgic()
KVM: arm64: timer: Drop warning on failed interrupt signalling
KVM: arm64: Fix alignment of kvm_hyp_memcache allocations
KVM: arm64: Convert timer offset VA when accessed in HYP code
KVM: arm64: Simplify warning in kvm_arch_vcpu_load_fp()
KVM: arm64: Eagerly switch ZCR_EL{1,2}
KVM: arm64: Mark some header functions as inline
KVM: arm64: Refactor exit handlers
KVM: arm64: Refactor CPTR trap deactivation
KVM: arm64: Remove VHE host restore of CPACR_EL1.SMEN
KVM: arm64: Remove VHE host restore of CPACR_EL1.ZEN
KVM: arm64: Remove host FPSIMD saving for non-protected KVM
KVM: arm64: Unconditionally save+flush host FPSIMD/SVE/SME state
KVM: x86: Load DR6 with guest value only before entering .vcpu_run() loop
KVM: nSVM: Enter guest mode before initializing nested NPT MMU
KVM: selftests: Add CPUID tests for Hyper-V features that need in-kernel APIC
KVM: selftests: Manage CPUID array in Hyper-V CPUID test's core helper
...
