Jens Axboe
edafccee56
io_uring: add support for pre-mapped user IO buffers ...
If we have fixed user buffers, we can map them into the kernel when we
setup the io_uring. That avoids the need to do get_user_pages() for
each and every IO.
To utilize this feature, the application must call io_uring_register()
after having setup an io_uring instance, passing in
IORING_REGISTER_BUFFERS as the opcode. The argument must be a pointer to
an iovec array, and the nr_args should contain how many iovecs the
application wishes to map.
If successful, these buffers are now mapped into the kernel, eligible
for IO. To use these fixed buffers, the application must use the
IORING_OP_READ_FIXED and IORING_OP_WRITE_FIXED opcodes, and then
set sqe->index to the desired buffer index. sqe->addr..sqe->addr+seq->len
must point to somewhere inside the indexed buffer.
The application may register buffers throughout the lifetime of the
io_uring instance. It can call io_uring_register() with
IORING_UNREGISTER_BUFFERS as the opcode to unregister the current set of
buffers, and then register a new set. The application need not
unregister buffers explicitly before shutting down the io_uring
instance.
It's perfectly valid to setup a larger buffer, and then sometimes only
use parts of it for an IO. As long as the range is within the originally
mapped region, it will work just fine.
For now, buffers must not be file backed. If file backed buffers are
passed in, the registration will fail with -1/EOPNOTSUPP. This
restriction may be relaxed in the future.
RLIMIT_MEMLOCK is used to check how much memory we can pin. A somewhat
arbitrary 1G per buffer size is also imposed.
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-02-28 08:24:23 -07:00
MIPS: BCM47XX: Setup struct device for the SoC
2019-01-09 13:21:02 -08:00
libceph: allow setting abort_on_full for rbd
2019-01-07 22:47:48 +01:00
dmaengine-4.21-rc1
2019-01-01 15:45:48 -08:00
Char/Misc driver patches for 4.21-rc1
2018-12-28 20:54:57 -08:00
This is the bulk of GPIO changes for the v4.21 kernel series:
2018-12-28 20:00:21 -08:00
irqchip/gic-v3-its: Fix ITT_entry_size accessor
2019-01-31 12:51:33 +00:00
- New Device Support
2019-01-15 06:24:36 +12:00
4.21 merge window pull request
2018-12-28 14:57:10 -08:00
MMC core:
2018-12-28 16:52:18 -08:00
Char/Misc driver patches for 4.21-rc1
2018-12-28 20:54:57 -08:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next
2018-12-20 18:20:26 -08:00
phy: fix build breakage: add PHY_MODE_SATA
2019-01-12 21:07:14 -08:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
2019-01-02 18:56:59 -08:00
power supply and reset changes for the v4.21 series
2018-12-28 20:22:45 -08:00
qed: Revert error handling changes.
2019-01-25 15:32:28 -08:00
lib/raid6: add option to skip algo benchmarking
2018-12-20 08:53:23 -08:00
Add io_uring IO interface
2019-02-28 08:24:23 -07:00
MMC core:
2018-12-28 16:52:18 -08:00
NFS client updates for Linux 4.21
2019-01-02 16:35:23 -08:00
Device properties framework updates for 4.21-rc1
2018-12-25 15:01:46 -08:00
writeback: synchronize sync(2) against cgroup writeback membership switches
2019-01-22 14:39:38 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2019-01-05 13:18:59 -08:00
block: add bio_set_polled() helper
2019-02-24 08:20:17 -07:00
blkcg: clean up blkg_tryget_closest()
2018-12-21 08:47:05 -07:00
block: kill BLK_MQ_F_SG_MERGE
2019-02-15 08:40:12 -07:00
block: Fix comment typo
2019-01-24 11:11:45 -07:00
block: kill QUEUE_FLAG_NO_SG_MERGE
2019-02-15 08:40:12 -07:00
blktrace: Show requests without sector
2019-02-07 12:57:17 -07:00
bpf: fix sanitation of alu op with pointer / scalar type from different paths
2019-01-05 21:32:38 -08:00
net: bpfilter: disallow to remove bpfilter module while being used
2019-01-11 18:05:41 -08:00
build_bug.h: remove most of dummy BUILD_BUG_ON stubs for Sparse
2019-01-04 13:13:45 -08:00
block: introduce mp_bvec_for_each_page() for iterating over page
2019-02-28 05:56:03 -07:00
include/linux/compiler*.h: fix OPTIMIZER_HIDE_VAR
2019-01-09 11:36:41 +01:00
include/linux/compiler*.h changes:
2019-01-21 07:23:42 +13:00
include/linux/compiler*.h: fix OPTIMIZER_HIDE_VAR
2019-01-09 11:36:41 +01:00
include/linux/compiler*.h: fix OPTIMIZER_HIDE_VAR
2019-01-09 11:36:41 +01:00
kasan: add CONFIG_KASAN_GENERIC and CONFIG_KASAN_SW_TAGS
2018-12-28 12:11:43 -08:00
cpu/hotplug: Fix "SMT disabled by BIOS" detection for KVM
2019-01-30 19:27:00 +01:00
cred: allow get_cred() and put_cred() to be given NULL.
2018-12-19 13:52:44 -05:00
crypto: skcipher - remove remnants of internal IV generators
2018-12-23 11:52:45 +08:00
fs/dcache: Track & report number of negative dentries
2019-01-30 11:02:11 -08:00
dma-mapping: implement dma_map_single_attrs using dma_map_page_attrs
2019-01-04 09:02:17 +01:00
dma-mapping: remove dma_zalloc_coherent()
2019-01-08 07:58:49 -05:00
drbd: introduce P_ZEROES (REQ_OP_WRITE_ZEROES on the "wire")
2018-12-20 09:51:31 -07:00
jump_label: move 'asm goto' support test to Kconfig
2019-01-06 09:46:51 +09:00
Merge branch 'next-integrity' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security
2019-01-02 09:43:14 -08:00
fbdev: fbmem: convert CONFIG_FB_LOGO_CENTER into a cmd line option
2019-01-16 17:42:35 +01:00
binder: fix use-after-free due to ksys_close() during fdget()
2018-12-19 09:40:13 +01:00
fs: add fget_many() and fput_many()
2019-02-28 08:24:23 -07:00
bpf: run bpf programs with preemption disabled
2019-01-31 23:14:55 +01:00
Fonts: New Terminus large console font
2018-12-19 10:42:08 +01:00
fs: add fget_many() and fput_many()
2019-02-28 08:24:23 -07:00
Tracing changes for v4.21:
2018-12-31 11:46:59 -08:00
lib/genalloc.c: fix allocation of aligned buffer from non-aligned chunk
2019-01-04 13:13:46 -08:00
drbd: Avoid Clang warning about pointless switch statment
2018-12-20 09:51:31 -07:00
include/linux/gfp.h: fix typo
2018-12-28 12:11:52 -08:00
HID: debug: fix the ring buffer implementation
2019-01-29 12:09:11 +01:00
HID: core: simplify active collection tracking
2019-01-16 14:29:48 +01:00
mm: convert totalram_pages and totalhigh_pages variables to atomic
2018-12-28 12:11:47 -08:00
mm/hmm: fix memremap.h, move dev_page_fault_t callback to hmm
2018-12-28 12:11:52 -08:00
mm, thp, proc: report THP eligibility for each vma
2018-12-28 12:11:50 -08:00
Drivers: hv: vmbus: Check for ring when getting debug info
2019-01-09 14:20:47 -05:00
ide: ensure atapi sense request aren't preempted
2019-01-31 08:25:09 -07:00
net: dev_is_mac_header_xmit() true for ARPHRD_RAWIP
2019-01-24 22:45:34 -08:00
genirq: Fix the kerneldoc comment for struct irq_affinity_desc
2019-01-18 00:18:45 +01:00
iomap: wire up the iopoll method
2019-02-24 08:20:17 -07:00
genirq/core: Introduce struct irq_affinity_desc
2018-12-19 11:32:08 +01:00
genirq/core: Introduce struct irq_affinity_desc
2018-12-19 11:32:08 +01:00
jump_label: move 'asm goto' support test to Kconfig
2019-01-06 09:46:51 +09:00
jump_label: move 'asm goto' support test to Kconfig
2019-01-06 09:46:51 +09:00
kasan: add __must_check annotations to kasan hooks
2018-12-28 12:11:44 -08:00
kernel/sysctl: add panic_print into sysctl
2019-01-04 13:13:47 -08:00
Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-12-26 17:03:51 -08:00
kgdb/treewide: constify struct kgdb_arch arch_kgdb_ops
2018-12-30 08:33:06 +00:00
Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2018-12-26 17:03:51 -08:00
kvm: Change offset in kvm_write_guest_offset_cached to unsigned
2018-12-21 11:28:22 +01:00
LEDs for 4.21-rc1
2018-12-25 14:52:50 -08:00
scsi: flip the default on use_clustering
2018-12-18 23:13:12 -05:00
libnvdimm/security: Require nvdimm_security_setup_events() to succeed
2019-01-21 09:57:43 -08:00
LSM: new method: ->sb_add_mnt_opt()
2018-12-21 11:50:02 -05:00
mailbox: Support blocking transfers in atomic context
2018-12-21 22:31:26 -06:00
mailbox: Support blocking transfers in atomic context
2018-12-21 22:31:26 -06:00
mm/memblock.c: skip kmemleak for kasan_init()
2018-12-28 12:11:49 -08:00
mm, oom: add oom victim's memcg to the oom context information
2018-12-28 12:11:48 -08:00
mm/hotplug: invalid PFNs from pfn_to_online_page()
2019-02-01 15:46:23 -08:00
mm/hmm: fix memremap.h, move dev_page_fault_t callback to hmm
2018-12-28 12:11:52 -08:00
mm: migrate: drop unused argument of migrate_page_move_mapping()
2018-12-28 12:11:51 -08:00
fs: don't open code lru_to_page()
2019-01-04 13:13:48 -08:00
fs: don't open code lru_to_page()
2019-01-04 13:13:48 -08:00
mm/mmu_notifier: use structure for invalidate_range_start/end calls v2
2018-12-28 12:11:50 -08:00
mm, page_alloc: do not wake kswapd with zone lock held
2019-01-08 17:15:11 -08:00
Add initial support for I3C along with 2 I3C master controller drivers.
2018-12-25 12:26:34 -08:00
x86, modpost: Replace last remnants of RETPOLINE with CONFIG_RETPOLINE
2019-01-09 10:35:56 +01:00
vfs: Separate changing mount flags full remount
2018-12-20 16:32:56 +00:00
genirq/core: Introduce struct irq_affinity_desc
2018-12-19 11:32:08 +01:00
ipvlan, l3mdev: fix broken l3s mode wrt local routes
2019-01-30 22:13:34 -08:00
jump_label: move 'asm goto' support test to Kconfig
2019-01-06 09:46:51 +09:00
net: convert bridge_nf to use skb extension infrastructure
2018-12-19 11:21:37 -08:00
jump_label: move 'asm goto' support test to Kconfig
2019-01-06 09:46:51 +09:00
linux/netlink.h: drop unnecessary extern prefix
2018-12-20 16:43:54 -08:00
NFS/NFSD/SUNRPC: replace generic creds with 'struct cred'.
2018-12-19 13:52:46 -05:00
NFS/SUNRPC: don't lookup machine credential until rpcauth_bindcred().
2018-12-19 13:52:45 -05:00
NFS/NFSD/SUNRPC: replace generic creds with 'struct cred'.
2018-12-19 13:52:46 -05:00
nvme-fc: convert to SPDX identifiers
2019-02-20 07:22:17 -07:00
nvme-fc: convert to SPDX identifiers
2019-02-20 07:22:17 -07:00
nvme-rdma: convert to SPDX identifiers
2019-02-20 07:22:19 -07:00
nvme-tcp.h: fix SPDX header
2019-02-20 07:22:10 -07:00
nvme_ioctl.h: remove duplicate GPL boilerplate
2019-02-20 07:22:05 -07:00
of: Remove struct device_node.type pointer
2019-01-10 16:24:44 -06:00
mm, oom: reorganize the oom report in dump_header
2018-12-28 12:11:48 -08:00
kasan, mm, arm64: tag non slab memory allocated via pagealloc
2018-12-28 12:11:44 -08:00
/proc/kpagecount: return 0 for special pages that are never mapped
2018-12-28 12:11:50 -08:00
mm: only report isolation failures when offlining memory
2018-12-28 12:11:46 -08:00
mm/pageblock: throw compile error if pageblock_bits cannot hold MIGRATE_TYPES
2018-12-28 12:11:51 -08:00
mm: put_and_wait_on_page_locked() while page is migrated
2018-12-28 12:11:48 -08:00
cross-tree: phase out dma_zalloc_coherent()
2019-01-08 07:58:37 -05:00
pci-v4.21-changes
2019-01-05 17:57:34 -08:00
pci-v4.21-changes
2019-01-05 17:57:34 -08:00
net: phy: phy driver features are mandatory
2019-01-19 10:03:08 -08:00
PM-runtime: Switch autosuspend over to using hrtimers
2018-12-19 10:31:50 +01:00
cpufreq: scpi/scmi: Fix freeing of dynamic OPPs
2019-01-04 12:19:40 +01:00
PM-runtime: Fix deadlock with ktime_get()
2019-01-30 22:49:06 +01:00
include/linux/printk.h: drop silly "static inline asmlinkage" from dump_stack()
2019-01-04 13:13:46 -08:00
ptr_ring: wrap back ->producer in __ptr_ring_swap_queue()
2019-01-01 11:58:33 -08:00
qcom-scm: Include <linux/err.h> header
2019-01-10 17:04:45 -06:00
regmap: irq: add an option to clear status registers on unmask
2018-12-19 18:38:13 +00:00
Remove 'type' argument from access_ok() function
2019-01-03 18:57:57 -08:00
reset: Add reset_control_get_count()
2019-01-07 16:38:26 +01:00
sbitmap: add helpers for add/del wait queue handling
2018-12-20 12:17:05 -07:00
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2019-02-03 09:08:12 -08:00
LSM: new method: ->sb_add_mnt_opt()
2018-12-21 11:50:02 -05:00
signal: Make siginmask safe when passed a signal of 0
2019-01-12 11:48:20 -06:00
net: Fix usage of pskb_trim_rcsum
2019-01-18 14:05:14 -08:00
bpf: sk_msg, fix socket data_ready events
2018-12-20 23:47:09 +01:00
A fairly normal cycle for documentation stuff. We have a new
2018-12-29 11:21:49 -08:00
mm: move obj_to_index to include/linux/slab_def.h
2018-12-28 12:11:44 -08:00
y2038: more syscalls and cleanups
2018-12-28 12:45:04 -08:00
net: stmmac: Fallback to Platform Data clock in Watchdog conversion
2019-01-30 22:24:49 -08:00
string.h: Add str_has_prefix() helper function
2018-12-22 22:50:29 -05:00
mm/swap: use nr_node_ids for avail_lists in swap_info_struct
2018-12-28 12:11:47 -08:00
io_uring: add support for pre-mapped user IO buffers
2019-02-28 08:24:23 -07:00
make 'user_access_begin()' do 'access_ok()'
2019-01-04 12:56:09 -08:00
umh: add exit routine for UMH process
2019-01-11 18:05:40 -08:00
virtio: document virtio_config_ops restrictions
2019-01-14 20:15:17 -05:00
include/linux/vmstat.h: remove unused page state adjustment macro
2018-12-28 12:11:51 -08:00
Watchdog: remove outdated comment
2018-12-22 12:15:29 +01:00
XArray: Fix an arithmetic error in xa_is_err
2019-01-17 07:19:42 -05:00
xxHash: create arch dependent 32/64-bit xxhash()
2018-12-28 12:11:46 -08:00
