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Bjorn Andersson 82f6ffb8e0 cpufreq: qcom-cpufreq-hw: Revert adding cpufreq qos [ Upstream commit `e2b47e5859` ] The OSM/EPSS hardware controls the frequency of each CPU cluster based on requests from the OS and various throttling events in the system. While throttling is in effect the related dcvs interrupt will be kept high. The purpose of the code handling this interrupt is to continuously report the thermal pressure based on the throttled frequency. The reasoning for adding QoS control to this mechanism is not entirely clear, but the introduction of commit 'c4c0efb06f17 ("cpufreq: qcom-cpufreq-hw: Add cpufreq qos for LMh")' causes the scaling_max_frequncy to be set to the throttled frequency. On the next iteration of polling, the throttled frequency is above or equal to the newly requested frequency, so the polling is stopped. With cpufreq limiting the max frequency, the hardware no longer report a throttling state and no further updates to thermal pressure or qos state are made. The result of this is that scaling_max_frequency can only go down, and the system becomes slower and slower every time a thermal throttling event is reported by the hardware. Even if the logic could be improved, there is no reason for software to limit the max freqency in response to the hardware limiting the max frequency. At best software will follow the reported hardware state, but typically it will cause slower backoff of the throttling. This reverts commit `c4c0efb06f`. Fixes: `c4c0efb06f` ("cpufreq: qcom-cpufreq-hw: Add cpufreq qos for LMh") Reported-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com> Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-05-11 23:03:12 +09:00
arch	arm64: dts: apple: t8103: Disable unused PCIe ports	2023-05-11 23:03:11 +09:00
block	blk-crypto: make blk_crypto_evict_key() more robust	2023-05-11 23:03:01 +09:00
certs	certs: Fix build error when PKCS#11 URI contains semicolon	2023-02-09 11:28:11 +01:00
crypto	crypto: api - Demote BUG_ON() in crypto_unregister_alg() to a WARN_ON()	2023-05-11 23:03:02 +09:00
Documentation	ASoC: dt-bindings: qcom,lpass-rx-macro: correct minItems for clocks	2023-05-11 23:03:05 +09:00
drivers	cpufreq: qcom-cpufreq-hw: Revert adding cpufreq qos	2023-05-11 23:03:12 +09:00
fs	erofs: fix potential overflow calculating xattr_isize	2023-05-11 23:03:07 +09:00
include	ACPI: processor: Fix evaluating _PDC method when running as Xen dom0	2023-05-11 23:03:11 +09:00
init	gcc: disable '-Warray-bounds' for gcc-13 too	2023-04-26 14:28:43 +02:00
io_uring	io_uring: fix memory leak when removing provided buffers	2023-04-13 16:55:31 +02:00
ipc	ipc: fix memory leak in init_mqueue_fs()	2022-12-31 13:32:01 +01:00
kernel	rcu: Fix missing TICK_DEP_MASK_RCU_EXP dependency check	2023-05-11 23:03:06 +09:00
lib	kunit: fix bug in the order of lines in debugfs logs	2023-05-11 23:03:05 +09:00
LICENSES	LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers	2021-12-16 14:33:10 +01:00
mm	mm/mempolicy: fix use-after-free of VMA iterator	2023-05-01 08:26:27 +09:00
net	bluetooth: Perform careful capability checks in hci_sock_ioctl()	2023-05-01 08:26:27 +09:00
rust	rust: kernel: Mark rust_fmt_argument as extern "C"	2023-04-26 14:28:38 +02:00
samples	ftrace: Export ftrace_free_filter() to modules	2023-02-01 08:34:37 +01:00
scripts	ASN.1: Fix check for strdup() success	2023-04-26 14:28:44 +02:00
security	selinux: ensure av_permissions.h is built when needed	2023-05-11 23:03:06 +09:00
sound	ASoC: amd: ps: update the acp clock source.	2023-05-11 23:02:59 +09:00
tools	tools/x86/kcpuid: Fix avx512bw and avx512lvl fields in Fn00000007	2023-05-11 23:03:07 +09:00
usr	usr/gen_init_cpio.c: remove unnecessary -1 values from int file	2022-10-03 14:21:44 -07:00
virt	KVM: Register /dev/kvm as the _very_ last thing during initialization	2023-03-10 09:34:11 +01:00
.clang-format	inet: ping: use hlist_nulls rcu iterator during lookup	2022-12-01 12:42:46 +01:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	get_maintainer: add Alan to .get_maintainer.ignore	2022-08-20 15:17:44 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	Kbuild: add Rust support	2022-09-28 09:02:20 +02:00
.mailmap	9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address	2022-12-10 17:10:52 -08:00
.rustfmt.toml	rust: add `.rustfmt.toml`	2022-09-28 09:02:20 +02:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Remove Michal Marek from Kbuild maintainers	2022-11-16 14:53:00 +09:00
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	audit: update the mailing list in MAINTAINERS	2023-02-25 11:25:42 +01:00
Makefile	Linux 6.1.27	2023-05-01 08:26:28 +09:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00

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.