* for-next/extable:
arm64: extable: cleanup redundant extable type EX_TYPE_FIXUP
arm64: extable: move _cond_extable to _cond_uaccess_extable
arm64: extable: make uaaccess helper use extable type EX_TYPE_UACCESS_ERR_ZERO
arm64: asm-extable: add asm uacess helpers
arm64: asm-extable: move data fields
arm64: extable: add new extable type EX_TYPE_KACCESS_ERR_ZERO support
* irq/misc-5.20:
: .
: Misc IRQ changes for 5.20:
:
: - Let irq_set_chip_handler_name_locked() take a const struct irq_chip *
:
: - Convert the ocelot irq_chip to being immutable (depends on the above)
:
: - Tidy-up the NOMAP irqdomain API variant
:
: - Teach action_show() to use for_each_action_of_desc()
:
: - Check ioremap() return value in the MIPS GIC driver
:
: - Move MMP driver init function declarations into the common .h
:
: - The obligatory typo fixes
: .
irqchip/mmp: Declare init functions in common header file
irqchip/mips-gic: Check the return value of ioremap() in gic_of_init()
genirq: Use for_each_action_of_desc in actions_show()
irqdomain: Use hwirq_max instead of revmap_size for NOMAP domains
irqdomain: Report irq number for NOMAP domains
irqchip/gic-v3: Fix comment typo
pinctrl: ocelot: Make irq_chip immutable
genirq: Allow irq_set_chip_handler_name_locked() to take a const irq_chip
Signed-off-by: Marc Zyngier <maz@kernel.org>
The functions icu_init_irq and mmp2_init_icu are exported
from this code, so declare them in the header file to avoid
the following sparse warnings:
drivers/irqchip/irq-mmp.c:248:13: warning: symbol 'icu_init_irq' was not declared. Should it be static?
drivers/irqchip/irq-mmp.c:271:13: warning: symbol 'mmp2_init_icu' was not declared. Should it be static?
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
[maz: fixup commit message]
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220724222152.551850-1-ben-linux@fluff.org
The .incbin assembler directive is much faster than bin2c + $(CC).
Do similar refactoring as in
4c0f032d49 ("s390/purgatory: Omit use of bin2c").
Please note the .quad directive matches to size_t in C (both 8
byte) because the purgatory is compiled only for the 64-bit kernel.
(KEXEC_FILE depends on X86_64).
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220725020812.622255-2-masahiroy@kernel.org
Overlay notification control onto IORING_OP_RSRC_UPDATE (former
IORING_OP_FILES_UPDATE). It allows to flush a range of zc notifications
from slots with indexes [sqe->off, sqe->off+sqe->len). If sqe->arg is
not zero, it also copies sqe->arg as a new tag for all flushed
notifications.
Note, it doesn't flush a notification of a slot if there was no requests
attached to it (since last flush or registration).
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/df13e2363400682a73dd9e71c3b990b8d1ff0333.1657643355.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Add internal part of send zerocopy notifications. There are two main
structures, the first one is struct io_notif, which carries inside
struct ubuf_info and maps 1:1 to it. io_uring will be binding a number
of zerocopy send requests to it and ask to complete (aka flush) it. When
flushed and all attached requests and skbs complete, it'll generate one
and only one CQE. There are intended to be passed into the network layer
as struct msghdr::msg_ubuf.
The second concept is notification slots. The userspace will be able to
register an array of slots and subsequently addressing them by the index
in the array. Slots are independent of each other. Each slot can have
only one notifier at a time (called active notifier) but many notifiers
during the lifetime. When active, a notifier not going to post any
completion but the userspace can attach requests to it by specifying
the corresponding slot while issueing send zc requests. Eventually, the
userspace will want to "flush" the notifier losing any way to attach
new requests to it, however it can use the next atomatically added
notifier of this slot or of any other slot.
When the network layer is done with all enqueued skbs attached to a
notifier and doesn't need the specified in them user data, the flushed
notifier will post a CQE.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/3ecf54c31a85762bf679b0a432c9f43ecf7e61cc.1657643355.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
* for-5.20/io_uring: (716 commits)
io_uring: ensure REQ_F_ISREG is set async offload
net: fix compat pointer in get_compat_msghdr()
io_uring: Don't require reinitable percpu_ref
io_uring: fix types in io_recvmsg_multishot_overflow
io_uring: Use atomic_long_try_cmpxchg in __io_account_mem
io_uring: support multishot in recvmsg
net: copy from user before calling __get_compat_msghdr
net: copy from user before calling __copy_msghdr
io_uring: support 0 length iov in buffer select in compat
io_uring: fix multishot ending when not polled
io_uring: add netmsg cache
io_uring: impose max limit on apoll cache
io_uring: add abstraction around apoll cache
io_uring: move apoll cache to poll.c
io_uring: consolidate hash_locked io-wq handling
io_uring: clear REQ_F_HASH_LOCKED on hash removal
io_uring: don't race double poll setting REQ_F_ASYNC_DATA
io_uring: don't miss setting REQ_F_DOUBLE_POLL
io_uring: disable multishot recvmsg
io_uring: only trace one of complete or overflow
...
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Merge prep net series for io_uring tx zc from the Jakub's tree.
* 'io_uring-zerocopy-send' of git://git.kernel.org/pub/scm/linux/kernel/git/kuba/linux:
net: fix uninitialised msghdr->sg_from_iter
tcp: support externally provided ubufs
ipv6/udp: support externally provided ubufs
ipv4/udp: support externally provided ubufs
net: introduce __skb_fill_page_desc_noacc
net: introduce managed frags infrastructure
net: Allow custom iter handler in msghdr
skbuff: carry external ubuf_info in msghdr
skbuff: add SKBFL_DONT_ORPHAN flag
skbuff: don't mix ubuf_info from different sources
ipv6: avoid partial copy for zc
ipv4: avoid partial copy for zc
If we're creating a page cache page with FGP_CREAT but FGP_NOWAIT is
set, we should dial back the gfp flags to avoid frivolous blocking
which is trivial to hit in low memory conditions:
[ 10.117661] __schedule+0x8c/0x550
[ 10.118305] schedule+0x58/0xa0
[ 10.118897] schedule_timeout+0x30/0xdc
[ 10.119610] __wait_for_common+0x88/0x114
[ 10.120348] wait_for_completion+0x1c/0x24
[ 10.121103] __flush_work.isra.0+0x16c/0x19c
[ 10.121896] flush_work+0xc/0x14
[ 10.122496] __drain_all_pages+0x144/0x218
[ 10.123267] drain_all_pages+0x10/0x18
[ 10.123941] __alloc_pages+0x464/0x9e4
[ 10.124633] __folio_alloc+0x18/0x3c
[ 10.125294] __filemap_get_folio+0x17c/0x204
[ 10.126084] iomap_write_begin+0xf8/0x428
[ 10.126829] iomap_file_buffered_write+0x144/0x24c
[ 10.127710] xfs_file_buffered_write+0xe8/0x248
[ 10.128553] xfs_file_write_iter+0xa8/0x120
[ 10.129324] io_write+0x16c/0x38c
[ 10.129940] io_issue_sqe+0x70/0x1cc
[ 10.130617] io_queue_sqe+0x18/0xfc
[ 10.131277] io_submit_sqes+0x5d4/0x600
[ 10.131946] __arm64_sys_io_uring_enter+0x224/0x600
[ 10.132752] invoke_syscall.constprop.0+0x70/0xc0
[ 10.133616] do_el0_svc+0xd0/0x118
[ 10.134238] el0_svc+0x78/0xa0
Clear IO, FS, and reclaim flags and mark the allocation as GFP_NOWAIT and
add __GFP_NOWARN to avoid polluting dmesg with pointless allocations
failures. A caller with FGP_NOWAIT must be expected to handle the
resulting -EAGAIN return and retry from a suitable context without NOWAIT
set.
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This adds the io_uring_short_write tracepoint to io_uring. A short write
is issued if not all pages that are required for a write are in the page
cache and the async buffered writes have to return EAGAIN.
Signed-off-by: Stefan Roesch <shr@fb.com>
Link: https://lore.kernel.org/r/20220616212221.2024518-13-shr@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This is actually an older issue, but we never used to hit the -EAGAIN
path before having done sb_start_write(). Make sure that we always call
kiocb_end_write() if we need to retry the write, so that we keep the
calls to sb_start_write() etc balanced.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This enables the async buffered writes for the filesystems that support
async buffered writes in io-uring. Buffered writes are enabled for
blocks that are already in the page cache or can be acquired with noio.
Signed-off-by: Stefan Roesch <shr@fb.com>
Link: https://lore.kernel.org/r/20220616212221.2024518-12-shr@fb.com
[axboe: adapt to 5.20 branch]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This adds a file_modified_async() function to return -EAGAIN if the
request either requires to remove privileges or needs to update the file
modification time. This is required for async buffered writes, so the
request gets handled in the io worker of io-uring.
Signed-off-by: Stefan Roesch <shr@fb.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/20220623175157.1715274-11-shr@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This adds async buffered write support to iomap.
This replaces the call to balance_dirty_pages_ratelimited() with the
call to balance_dirty_pages_ratelimited_flags. This allows to specify if
the write request is async or not.
In addition this also moves the above function call to the beginning of
the function. If the function call is at the end of the function and the
decision is made to throttle writes, then there is no request that
io-uring can wait on. By moving it to the beginning of the function, the
write request is not issued, but returns -EAGAIN instead. io-uring will
punt the request and process it in the io-worker.
By moving the function call to the beginning of the function, the write
throttling will happen one page later.
Signed-off-by: Stefan Roesch <shr@fb.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/20220623175157.1715274-6-shr@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This adds the helper function balance_dirty_pages_ratelimited_flags().
It adds the parameter flags to balance_dirty_pages_ratelimited().
The flags parameter is passed to balance_dirty_pages(). For async
buffered writes the flag value will be BDP_ASYNC.
If balance_dirty_pages() gets called for async buffered write, we don't
want to wait. Instead we need to indicate to the caller that throttling
is needed so that it can stop writing and offload the rest of the write
to a context that can block.
The new helper function is also used by balance_dirty_pages_ratelimited().
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Stefan Roesch <shr@fb.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220623175157.1715274-4-shr@fb.com
[axboe: fix kerneltest bot 'ret' issue]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Transition of wb->dirty_exceeded from 0 to 1 happens before we go to
sleep in balance_dirty_pages() while transition from 1 to 0 happens when
exiting from balance_dirty_pages(), possibly based on old values. This
does not make a lot of sense since wb->dirty_exceeded should simply
reflect whether wb is over dirty limit and so we should ratelimit
entering to balance_dirty_pages() less. Move the two updates together.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Stefan Roesch <shr@fb.com>
Link: https://lore.kernel.org/r/20220623175157.1715274-3-shr@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
