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Jan Bottorff f5d1065139 i2c: designware: Fix corrupted memory seen in the ISR [ Upstream commit `f726eaa787` ] When running on a many core ARM64 server, errors were happening in the ISR that looked like corrupted memory. These corruptions would fix themselves if small delays were inserted in the ISR. Errors reported by the driver included "i2c_designware APMC0D0F:00: i2c_dw_xfer_msg: invalid target address" and "i2c_designware APMC0D0F:00:controller timed out" during in-band IPMI SSIF stress tests. The problem was determined to be memory writes in the driver were not becoming visible to all cores when execution rapidly shifted between cores, like when a register write immediately triggers an ISR. Processors with weak memory ordering, like ARM64, make no guarantees about the order normal memory writes become globally visible, unless barrier instructions are used to control ordering. To solve this, regmap accessor functions configured by this driver were changed to use non-relaxed forms of the low-level register access functions, which include a barrier on platforms that require it. This assures memory writes before a controller register access are visible to all cores. The community concluded defaulting to correct operation outweighed defaulting to the small performance gains from using relaxed access functions. Being a low speed device added weight to this choice of default register access behavior. Signed-off-by: Jan Bottorff <janb@os.amperecomputing.com> Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Tested-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Signed-off-by: Wolfram Sang <wsa@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-12-13 18:44:56 +01:00
arch	x86/xen: fix percpu vcpu_info allocation	2023-12-08 08:52:25 +01:00
block	block: update the stable_writes flag in bdev_add	2023-12-03 07:33:03 +01:00
certs	certs: Reference revocation list for all keyrings	2023-08-17 20:12:41 +00:00
crypto	crypto: pcrypt - Fix hungtask for PADATA_RESET	2023-11-28 17:19:42 +00:00
Documentation	leds: class: Don't expose color sysfs entry	2023-12-08 08:52:15 +01:00
drivers	i2c: designware: Fix corrupted memory seen in the ISR	2023-12-13 18:44:56 +01:00
fs	btrfs: fix 64bit compat send ioctl arguments not initializing version member	2023-12-08 08:52:20 +01:00
include	hrtimers: Push pending hrtimers away from outgoing CPU earlier	2023-12-13 18:44:56 +01:00
init	proc: sysctl: prevent aliased sysctls from getting passed to init	2023-11-28 17:19:57 +00:00
io_uring	io_uring/kbuf: recycle freed mapped buffer ring entries	2023-12-08 08:52:21 +01:00
ipc	Add x86 shadow stack support	2023-08-31 12:20:12 -07:00
kernel	hrtimers: Push pending hrtimers away from outgoing CPU earlier	2023-12-13 18:44:56 +01:00
lib	parisc: Drop the HP-UX ENOSYM and EREMOTERELEASE error codes	2023-12-08 08:52:20 +01:00
LICENSES	LICENSES: Add the copyleft-next-0.3.1 license	2022-11-08 15:44:01 +01:00
mm	filemap: add a per-mapping stable writes flag	2023-12-03 07:33:03 +01:00
net	Revert "wifi: cfg80211: fix CQM for non-range use"	2023-12-11 10:40:17 +01:00
rust	rust: docs: fix logo replacement	2023-10-19 16:40:00 +02:00
samples	samples/bpf: syscall_tp_user: Fix array out-of-bound access	2023-11-28 17:19:48 +00:00
scripts	scripts/gdb/vmalloc: disable on no-MMU	2023-11-28 17:20:05 +00:00
security	apparmor: Fix regression in mount mediation	2023-11-28 17:20:07 +00:00
sound	ALSA: hda/realtek: Add supported ALC257 for ChromeOS	2023-12-08 08:52:16 +01:00
tools	selftests/net: mptcp: fix uninitialized variable warnings	2023-12-08 08:52:22 +01:00
usr	initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP	2023-06-06 17:54:49 +09:00
virt	ARM:	2023-09-07 13:52:20 -07:00
.clang-format	iommu: Add for_each_group_device()	2023-05-23 08:15:51 +02:00
.cocciconfig
.get_maintainer.ignore	get_maintainer: add Alan to .get_maintainer.ignore	2022-08-20 15:17:44 -07:00
.gitattributes	.gitattributes: set diff driver for Rust source code files	2023-05-31 17:48:25 +02:00
.gitignore	kbuild: rpm-pkg: rename binkernel.spec to kernel.spec	2023-07-25 00:59:33 +09:00
.mailmap	20 hotfixes. 12 are cc:stable and the remainder address post-6.5 issues	2023-10-24 09:52:16 -10:00
.rustfmt.toml	rust: add `.rustfmt.toml`	2022-09-28 09:02:20 +02:00
COPYING
CREDITS	USB: Remove Wireless USB and UWB documentation	2023-08-09 14:17:32 +02:00
Kbuild	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	Char/Misc driver fixes for 6.6-final	2023-10-28 07:51:27 -10:00
Makefile	Linux 6.6.6	2023-12-11 10:40:17 +01:00
README

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.