Tianyu Lan 20347fca71 swiotlb: split up the global swiotlb lock ... Traditionally swiotlb was not performance critical because it was only used for slow devices. But in some setups, like TDX/SEV confidential guests, all IO has to go through swiotlb. Currently swiotlb only has a single lock. Under high IO load with multiple CPUs this can lead to significat lock contention on the swiotlb lock. This patch splits the swiotlb bounce buffer pool into individual areas which have their own lock. Each CPU tries to allocate in its own area first. Only if that fails does it search other areas. On freeing the allocation is freed into the area where the memory was originally allocated from. Area number can be set via swiotlb kernel parameter and is default to be possible cpu number. If possible cpu number is not power of 2, area number will be round up to the next power of 2. This idea from Andi Kleen patch(https://github.com/intel/tdx/commit/ 4529b5784c141782c72ec9bd9a92df2b68cb7d45). Based-on-idea-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com> Signed-off-by: Christoph Hellwig <hch@lst.de>		2022-07-13 13:23:10 +02:00
..
ABI	Yet another hw vulnerability with a software mitigation: Processor MMIO	2022-06-14 07:43:15 -07:00
PCI	PCI/doc: Update obsolete pci_set_dma_mask() references	2022-04-21 12:10:44 -05:00
RCU	Merge branch 'exp.2022.05.11a' into HEAD	2022-05-11 11:49:35 -07:00
accounting	delayacct: track delays from write-protect copy	2022-06-01 15:55:25 -07:00
admin-guide	swiotlb: split up the global swiotlb lock	2022-07-13 13:23:10 +02:00
arc	…
arm	docs: arm: tcm: Fix typo in description of TCM and MMU usage	2022-06-09 12:56:33 -06:00
arm64	arm64/sme: Fix SVE/SME typo in ABI documentation	2022-06-08 18:38:31 +01:00
block	…
bpf	bpf, docs: Fix typo "respetively" to "respectively"	2022-04-28 17:20:48 +02:00
cdrom	It was a moderately busy cycle for documentation; highlights include:	2022-05-25 11:17:41 -07:00
core-api	It was a moderately busy cycle for documentation; highlights include:	2022-05-25 11:17:41 -07:00
cpu-freq	…
crypto	…
dev-tools	Yang Shi has improved the behaviour of khugepaged collapsing of readonly	2022-05-26 12:32:41 -07:00
devicetree	A set of interrupt subsystem updates:	2022-06-19 09:45:16 -05:00
doc-guide	Documentation/process: use scripts/get_maintainer.pl on patches	2022-05-09 16:12:16 -06:00
driver-api	docs: Move the HTE documentation to driver-api/	2022-06-09 10:02:47 -06:00
fault-injection	docs: fault-injection: fix defaults	2022-04-16 02:46:44 -06:00
fb	…
features	Documentation/features: Update the arch support status files	2022-06-09 09:35:57 -06:00
filesystems	ext4, doc: remove unnecessary escaping	2022-06-16 11:03:17 -04:00
firmware-guide	TTY / Serial driver changes for 5.19-rc1	2022-06-03 11:08:40 -07:00
firmware_class	…
fpga	Documentation: fpga: dfl: add link address of feature id table	2022-05-10 16:05:27 +08:00
gpu	drm/todo: Add entry for using kunit in the subsystem	2022-05-05 10:09:06 +02:00
hid	…
hwmon	hwmon: Make chip parameter for with_info API mandatory	2022-05-22 11:32:31 -07:00
i2c	docs: i2c: reference simple probes	2022-05-04 22:35:19 +02:00
ia64	…
iio	…
images	docs: add SVG version of the Linux logo	2022-06-01 09:32:45 -06:00
infiniband	…
input	documentation: Format button_dev as a pointer.	2022-06-01 09:34:28 -06:00
isdn	…
kbuild	Kbuild updates for v5.19	2022-05-26 12:09:50 -07:00
kernel-hacking	Documentation: kernel-hacking: minor edits for style	2022-04-05 09:53:24 -06:00
leds	leds: qcom-lpg: Require pattern to follow documentation	2022-05-24 22:08:10 +02:00
litmus-tests	…
livepatch	…
locking	…
loongarch	docs/LoongArch: Fix notes rendering by using reST directives	2022-06-17 22:09:05 +08:00
m68k	…
maintainer	…
mhi	…
mips	…
misc-devices	Documentation: Wire Oxford Semiconductor PCIe (Tornado) 950	2022-05-19 18:24:22 +02:00
netlabel	…
networking	docs: networking: phy: Fix a typo	2022-06-13 23:12:44 -07:00
nios2	…
nvdimm	…
openrisc	…
parisc	…
pcmcia	…
peci	…
power	Documentation: EM: Add artificial EM registration description	2022-04-13 16:26:18 +02:00
powerpc	powerpc: Enable the DAWR on POWER9 DD2.3 and above	2022-05-22 15:59:53 +10:00
process	scripts/check-local-export: avoid 'wait $!' for process substitution	2022-06-10 03:47:13 +09:00
riscv	Documentation: riscv: Add sv48 description to VM layout	2022-06-01 20:38:34 -07:00
s390	…
scheduler	docs/scheduler: fix unit error	2022-04-16 02:54:32 -06:00
scsi	…
security	integrity-v5.19	2022-05-24 13:50:39 -07:00
sh	…
sound	ALSA: usb-audio: Add quirk bits for enabling/disabling generic implicit fb	2022-04-21 10:17:17 +02:00
sparc	…
sphinx	docs: pdfdocs: Add space for chapter counts >= 100 in TOC	2022-05-17 13:41:26 -06:00
sphinx-static	…
spi	…
staging	…
target	…
timers	…
tools	Updates to Real Time Linux Analysis tool for 5.19:	2022-05-29 10:48:58 -07:00
trace	tracing/timerlat: Print stacktrace in the IRQ handler if needed	2022-05-26 21:13:00 -04:00
translations	docs/zh_CN/LoongArch: Fix notes rendering by using reST directives	2022-06-17 22:09:05 +08:00
usb	docs: usb: fix literal block marker in usbmon verification example	2022-06-09 09:50:03 -06:00
userspace-api	media: lirc: add missing exceptions for lirc uapi header file	2022-05-26 14:30:17 -07:00
virt	S390:	2022-05-26 14:20:14 -07:00
vm	Yang Shi has improved the behaviour of khugepaged collapsing of readonly	2022-05-26 12:32:41 -07:00
w1	w1: w1_therm: Document Maxim MAX31850 thermoelement IF.	2022-04-05 10:19:42 -06:00
watchdog	…
x86	x86/swiotlb: fix param usage in boot-options.rst	2022-06-22 12:42:08 +02:00
xtensa	…
.gitignore	…
Changes	…
CodingStyle	…
Kconfig	…
Makefile	…
SubmittingPatches	…
arch.rst	Documentation: LoongArch: Add basic documentations	2022-06-03 20:09:27 +08:00
asm-annotations.rst	…
atomic_bitops.txt	…
atomic_t.txt	…
conf.py	docs/conf.py: Cope with removal of language=None in Sphinx 5.0.0	2022-06-01 09:26:05 -06:00
docutils.conf	…
dontdiff	randstruct: Move seed generation into scripts/basic/	2022-05-08 01:33:07 -07:00
index.rst	docs: Move the HTE documentation to driver-api/	2022-06-09 10:02:47 -06:00
memory-barriers.txt	…