io_uring_sanitise_params() sanitises most of the setup flags invariants,
move the IORING_SETUP_FLAGS check from io_uring_setup() into it.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
mem_is_zero() does the job without hand rolled loops, use that to verify
reserved fields of ring params.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
There is no need to pass the user requested number of SQ entries
separately from the main parameter structure io_uring_params. Initialise
it at the beginning and stop passing it in favour of struct
io_uring_params::sq_entries.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
There has been type related issues with region size calculation, add an
utility helper function that returns the size and handles type
conversions right.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Instead of having an array of a calculated size as a buffer, put all
query uapi structures into a union and pass that around. That way
everything is well typed, and the compiler will prevent opcode handling
using a structure not accounted into the buffer size.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
netdev ops must be called under instance lock or rtnl_lock, but
io_register_zcrx_ifq() isn't doing this for netdev_queue_get_dma_dev().
Fix this by taking the instance lock using netdev_get_by_index_lock().
Extended the instance lock section to include attaching a memory
provider. Could not move io_zcrx_create_area() outside, since the dmabuf
codepath IORING_ZCRX_AREA_DMABUF requires ifq->dev.
Fixes: 59b8b32ac8 ("io_uring/zcrx: add support for custom DMA devices")
Signed-off-by: David Wei <dw@davidwei.uk>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Need to call netdev_get_by_index_lock() from io_uring/zcrx.c, but it is
currently private to net. Export the function in linux/netdevice.h.
Signed-off-by: David Wei <dw@davidwei.uk>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
IORING_SETUP_NO_MMAP rings remain user accessible even before the ctx
setup is finalised, so use WRITE_ONCE consistently when initialising
rings.
Fixes: 03d89a2de2 ("io_uring: support for user allocated memory for rings/sqes")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Add a refcount to struct io_zcrx_ifq to reverse the refcounting
relationship i.e. rings now reference ifqs instead. As a result of this,
remove ctx->refs that an ifq holds on a ring via the page pool memory
provider.
This ref ifq->refs is held by internal users of an ifq, namely rings and
the page pool memory provider associated with an ifq. This is needed to
keep the ifq around until the page pool is destroyed.
Since ifqs now no longer hold refs to ring ctx, there isn't a need to
split the cleanup of ifqs into two: io_shutdown_zcrx_ifqs() in
io_ring_exit_work() while waiting for ctx->refs to drop to 0, and
io_unregister_zcrx_ifqs() after. Remove io_shutdown_zcrx_ifqs().
Signed-off-by: David Wei <dw@davidwei.uk>
Co-developed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
In preparation for removing the ref on ctx->refs held by an ifq and
removing io_shutdown_zcrx_ifqs(), move io_unregister_zcrx_ifqs() down
such that it can call io_zcrx_scrub().
Signed-off-by: David Wei <dw@davidwei.uk>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
In preparation for removing ifq->ctx and making ifq lifetime independent
of ring ctx, add user_struct and mm_struct to io_zcrx_ifq.
In the ifq cleanup path, these are the only fields used from the main
ring ctx to do accounting. Taking a copy in the ifq allows ifq->ctx to
be removed later, including the ctx->refs held by the ifq.
Signed-off-by: David Wei <dw@davidwei.uk>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Add io_zcrx_ifq arg to io_zcrx_free_area(). A QOL change to reduce line
widths.
Signed-off-by: David Wei <dw@davidwei.uk>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Refactor io_{un}account_mem() to take user_struct and mm_struct
directly, instead of accessing it from the ring ctx.
Signed-off-by: David Wei <dw@davidwei.uk>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Refactor io_free_region() to take user_struct directly, instead of
accessing it from the ring ctx.
Signed-off-by: David Wei <dw@davidwei.uk>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Remove io_ring_ctx arg from io_region_pin_pages() and
io_region_allocate_pages() that isn't used.
Signed-off-by: David Wei <dw@davidwei.uk>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Free up a bit of space in the shared futex opcode private data, by
moving the futexv specific futexv_owned out of there and into the struct
specific to vectored futexes.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Rather than alloc an array of struct futex_vector for the futexv wait
handling, wrap it in a struct io_futexv_data struct, similar to what
the non-vectored futex wait handling does.
No functional changes in this patch.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
io_mem_alloc_compound() returns either ERR_PTR(-ENOMEM) or a virtual
address for the allocated memory, but its caller just checks whether the
result is an error. Return a bool success value instead.
Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
There's a bunch of code strictly dealing with cancelations, and that
code really belongs in cancel.c rather than in the core io_uring.c file.
Move the code there. Mostly mechanical, only real oddity here is that
struct io_defer_entry now needs to be visible across both io_uring.c
and cancel.c.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
It's just getting an integer from userspace, installing a file, then
copying the output direct descriptor back. No need to use the full
copy_to/from_user() for that.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
io_uring task work dispatch makes an indirect call to struct io_kiocb's
io_task_work.func field to allow running arbitrary task work functions.
In the uring_cmd case, this calls io_uring_cmd_work(), which immediately
makes another indirect call to struct io_uring_cmd's task_work_cb field.
Change the uring_cmd task work callbacks to functions whose signatures
match io_req_tw_func_t. Add a function io_uring_cmd_from_tw() to convert
from the task work's struct io_tw_req argument to struct io_uring_cmd *.
Define a constant IO_URING_CMD_TASK_WORK_ISSUE_FLAGS to avoid
manufacturing issue_flags in the uring_cmd task work callbacks. Now
uring_cmd task work dispatch makes a single indirect call to the
uring_cmd implementation's callback. This also allows removing the
task_work_cb field from struct io_uring_cmd, freeing up 8 bytes for
future storage.
Since fuse_uring_send_in_task() now has access to the io_tw_token_t,
check its cancel field directly instead of relying on the
IO_URING_F_TASK_DEAD issue flag.
Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
In preparation for uring_cmd implementations to implement functions
with the io_req_tw_func_t signature, introduce a wrapper struct
io_tw_req to hide the struct io_kiocb * argument. The intention is for
only the io_uring core to access the inner struct io_kiocb *. uring_cmd
implementations should instead call a helper from io_uring/cmd.h to
convert struct io_tw_req to struct io_uring_cmd *.
Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
io_fallback_req_func() calls io_should_terminate_tw() on each req's ctx.
But since the reqs all come from the ctx's fallback_llist, req->ctx will
be ctx for all of the reqs. Therefore, compute ts.cancel as
io_should_terminate_tw(ctx) just once, outside the loop.
Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
The mixed SQE support assumes that userspace always passes valid data,
that is not the case. Validate the opcode properly before indexing
the io_issue_defs[] array, and pass it through the nospec indexing
as well as it's a user valid indexing a kernel array.
Fixes: 1cba30bf9f ("io_uring: add support for IORING_SETUP_SQE_MIXED")
Reported-by: syzbot+b883b008a0b1067d5833@syzkaller.appspotmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
The sq_head indicates the index directly in the submission queue when
the IORING_SETUP_NO_SQARRAY option is used, so use that instead of
skipping showing the entries.
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
io_submit_sqes() shouldn't be stepping into its main loop when there is
nothing to submit, i.e. nr=0. Fix 0 submission queue entries checks,
which should follow after all user input truncations.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Normal rings support 64b SQEs for posting submissions, while certain
features require the ring to be configured with IORING_SETUP_SQE128, as
they need to convey more information per submission. This, in turn,
makes ALL the SQEs be 128b in size. This is somewhat wasteful and
inefficient, particularly when only certain SQEs need to be of the
bigger variant.
This adds support for setting up a ring with mixed SQE sizes, using
IORING_SETUP_SQE_MIXED. When setup in this mode, SQEs posted to the ring
may be either 64b or 128b in size. If a SQE is 128b in size, then opcode
will be set to a variante to indicate that this is the case. Any other
non-128b opcode will assume the SQ's default size.
SQEs on these types of mixed rings may also utilize NOP with skip
success set. This can happen if the ring is one (small) SQE entry away
from wrapping, and an attempt is made to get a 128b SQE. As SQEs must be
contiguous in the SQ ring, a 128b SQE cannot wrap the ring. For this
case, a single NOP SQE should be inserted with the SKIP_SUCCESS flag
set. The kernel will process this as a normal NOP and without posting a
CQE.
Signed-off-by: Keith Busch <kbusch@kernel.org>
[axboe: {} style fix and assign sqe before opcode read]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
io_register_mem_region() can try to remove a region right after
publishing it. This non-atomicity is annoying. Do it in two steps
similar to io_register_mem_region(), create memory first and publish it
once the rest of the handling is done. Remove now unused
io_create_region_mmap_safe(), which was assumed to be a temporary
solution from day one.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
kbuf ring is published by io_buffer_add_list(), which correctly protects
with mmap_lock, there is no need to use io_create_region_mmap_safe()
before as the region is not yet exposed to the userspace via mmap.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
io_free_region() tolerates empty regions but there is no reason to that
either. If the first io_create_region() in io_register_resize_rings()
fails, just return the error without attempting to clean it up.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
io_register_free_rings() doesn't use its "struct io_uring_params"
parameter, remove it.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
io_create_region_mmap_safe() is only needed when the created region is
exposed to userspace code via mmap. io_register_resize_rings() creates
them locally on stack, so the no mmap_safe version of the helper is
enough.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
It's a good practice to validate parameters before doing any heavy stuff
like queue allocations. Do that for io_allocate_scq_urings().
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
A minor cleanup precomputing the sq size first instead of branching
array_size() in io_allocate_scq_urings().
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Use it everywhere that the wait_queue_entry is removed from the head,
and be a bit more cautious in zeroing out iw->head whenever the entry is
removed from the list.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Both callers of this need the entry potentially removed, so shift the
removal into the completion side and kill it from the two callers.
While at it, add a helper for removing the wait_queue_entry based
on the passed in io_kiocb.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Rather than do per-tw checking, which needs to dip into the task_struct
for checking flags, do it upfront before running task_work. This places
a 'cancel' member in io_tw_token_t, which is assigned before running
task_work for that given ctx.
This is both more efficient in doing it upfront rather than for every
task_work, and it means that io_should_terminate_tw() can be made
private in io_uring.c rather than need to be called by various
callbacks of task_work.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
have correct lost idle time accounting
- Stop the deadline server task before a CPU goes offline
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Merge tag 'sched_urgent_for_v6.18_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler fixes from Borislav Petkov:
- Make sure the check for lost pelt idle time is done unconditionally
to have correct lost idle time accounting
- Stop the deadline server task before a CPU goes offline
* tag 'sched_urgent_for_v6.18_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
sched/fair: Fix pelt lost idle time detection
sched/deadline: Stop dl_server before CPU goes offline
- Move the uprobe optimization to a better location logically
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Merge tag 'perf_urgent_for_v6.18_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fixes from Borislav Petkov:
- Make sure perf reporting works correctly in setups using
overlayfs or FUSE
- Move the uprobe optimization to a better location logically
* tag 'perf_urgent_for_v6.18_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/core: Fix MMAP2 event device with backing files
perf/core: Fix MMAP event path names with backing files
perf/core: Fix address filter match with backing files
uprobe: Move arch_uprobe_optimize right after handlers execution
remaining from previous boots
- Add a missing barrier in the TLB flushing code to prevent erroneously not
flushing a TLB generation
- Make sure cpa_flush() does not overshoot when computing the end range of
a flush region
- Fix resctrl bandwidth counting on AMD systems when the amount of monitoring
groups created exceeds the number the hardware can track
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Merge tag 'x86_urgent_for_v6.18_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Borislav Petkov:
- Reset the why-the-system-rebooted register on AMD to avoid stale bits
remaining from previous boots
- Add a missing barrier in the TLB flushing code to prevent erroneously
not flushing a TLB generation
- Make sure cpa_flush() does not overshoot when computing the end range
of a flush region
- Fix resctrl bandwidth counting on AMD systems when the amount of
monitoring groups created exceeds the number the hardware can track
* tag 'x86_urgent_for_v6.18_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/CPU/AMD: Prevent reset reasons from being retained across reboot
x86/mm: Fix SMP ordering in switch_mm_irqs_off()
x86/mm: Fix overflow in __cpa_addr()
x86/resctrl: Fix miscount of bandwidth event when reactivating previously unavailable RMID
'rustfmt', by default, formats imports in a way that is prone to
conflicts while merging and rebasing, since in some cases it condenses
several items into the same line.
Document in our guidelines that we will handle this for the moment with
the trailing empty comment workaround and make the tree 'rustfmt'-clean
again.
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Merge tag 'rust-rustfmt' of git://git.kernel.org/pub/scm/linux/kernel/git/ojeda/linux
Pull rustfmt fixes from Miguel Ojeda:
"Rust 'rustfmt' cleanup
'rustfmt', by default, formats imports in a way that is prone to
conflicts while merging and rebasing, since in some cases it condenses
several items into the same line.
Document in our guidelines that we will handle this for the moment
with the trailing empty comment workaround and make the tree
'rustfmt'-clean again"
* tag 'rust-rustfmt' of git://git.kernel.org/pub/scm/linux/kernel/git/ojeda/linux:
rust: bitmap: fix formatting
rust: cpufreq: fix formatting
rust: alloc: employ a trailing comment to keep vertical layout
docs: rust: add section on imports formatting
If possible, could you still pick this change for v6.18 [1]? The change in
question corrects the state transitions for ARM FF-A to match the spec and
how tpm_crb behaves on other platforms.
[1] https://lore.kernel.org/linux-integrity/aPN59bwcUrieMACf@kernel.org/
BR, Jarkko
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Merge tag 'tpmdd-next-v6.18-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd
Pull tpm fix from Jarkko Sakkinen:
"Correct the state transitions for ARM FF-A to match the spec and how
tpm_crb behaves on other platforms"
* tag 'tpmdd-next-v6.18-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd:
tpm_crb: Add idle support for the Arm FF-A start method
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Merge tag 'pci-v6.18-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci
Pull pci fixes from Bjorn Helgaas:
- Search for MSI Capability with correct ID to fix an MSI regression on
platforms with Cadence IP (Hans Zhang)
- Revert early bridge resource set up to fix resource assignment
failures that broke at least alpha boot and Snapdragon ath12k WiFi
(Ilpo Järvinen)
- Implement VMD .irq_startup()/.irq_shutdown() to fix IRQ issues that
caused boot crashes and broken devices below VMD (Inochi Amaoto)
- Select CONFIG_SCREEN_INFO on X86 to fix black screen on boot when
SCREEN_INFO not selected (Mario Limonciello)
* tag 'pci-v6.18-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci:
PCI/VGA: Select SCREEN_INFO on X86
PCI: vmd: Override irq_startup()/irq_shutdown() in vmd_init_dev_msi_info()
PCI: Revert early bridge resource set up
PCI: cadence: Search for MSI Capability with correct ID
