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linux/drivers/cpufreq
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Rafael J. Wysocki 3e25a8efd2 cpufreq: intel_pstate: Check turbo_is_disabled() in store_no_turbo() 
[ Upstream commit 350cbb5d2f ]

After recent changes in intel_pstate, global.turbo_disabled is only set
at the initialization time and never changed.  However, it turns out
that on some systems the "turbo disabled" bit in MSR_IA32_MISC_ENABLE,
the initial state of which is reflected by global.turbo_disabled, can be
flipped later and there should be a way to take that into account (other
than checking that MSR every time the driver runs which is costly and
useless overhead on the vast majority of systems).

For this purpose, notice that before the changes in question,
store_no_turbo() contained a turbo_is_disabled() check that was used
for updating global.turbo_disabled if the "turbo disabled" bit in
MSR_IA32_MISC_ENABLE had been flipped and that functionality can be
restored.  Then, users will be able to reset global.turbo_disabled
by writing 0 to no_turbo which used to work before on systems with
flipping "turbo disabled" bit.

This guarantees the driver state to remain in sync, but READ_ONCE()
annotations need to be added in two places where global.turbo_disabled
is accessed locklessly, so modify the driver to make that happen.

Fixes: 0940f1a801 ("cpufreq: intel_pstate: Do not update global.turbo_disabled after initialization")
Closes: https://lore.kernel.org/linux-pm/bf3ebf1571a4788e97daf861eb493c12d42639a3.camel@xry111.site
Suggested-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Reported-by: Xi Ruoyao <xry111@xry111.site>
Tested-by: Xi Ruoyao <xry111@xry111.site>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-09-09 18:54:25 +02:00
..
acpi-cpufreq.c acpi-cpufreq: Fix nominal_freq units to KHz in get_max_boost_ratio() 2025-06-27 11:07:05 +01:00
amd-pstate-trace.c cpufreq: amd-pstate: Add trace for AMD P-State module 2021-12-30 18:51:39 +01:00
amd-pstate-trace.h cpufreq: amd-pstate: Add more tracepoint for AMD P-State module 2022-03-09 19:53:01 +01:00
amd-pstate-ut.c cpufreq: amd-pstate-ut: Fix kernel panic when loading the driver 2023-09-13 09:42:29 +02:00
amd-pstate.c Revert "cpufreq: amd-pstate: Fix the inconsistency in max frequency units" 2024-07-05 09:32:00 +02:00
amd_freq_sensitivity.c cpufreq: amd_freq_sensitivity: Add missing pci_dev_put() 2022-12-31 13:31:58 +01:00
armada-8k-cpufreq.c cpufreq: armada-8k: Fix off by one in armada_8k_cpufreq_free_table() 2025-08-28 16:26:05 +02:00
armada-37xx-cpufreq.c cpufreq: Explicitly include correct DT includes 2024-03-26 18:20:31 -04:00
bmips-cpufreq.c cpufreq: bmips-cpufreq: Use module_init and add module_exit 2022-08-30 13:49:23 +05:30
brcmstb-avs-cpufreq.c cpufreq: brcmstb-avs-cpufreq: fix up "add check for cpufreq_cpu_get's return value" 2024-04-03 15:19:39 +02:00
cppc_cpufreq.c cpufreq: CPPC: Mark driver with NEED_UPDATE_LIMITS flag 2025-08-28 16:25:52 +02:00
cpufreq-dt-platdev.c cpufreq: Use of_property_present() for testing DT property presence 2024-01-25 15:27:20 -08:00
cpufreq-dt.c cpufreq: dt: always allocate zeroed cpumask 2024-04-03 15:19:37 +02:00
cpufreq-dt.h cpufreq: dt: Allow platform specific intermediate callbacks 2020-03-12 15:43:52 +05:30
cpufreq-nforce2.c cpufreq: Avoid creating excessively large stack frames 2020-01-27 10:33:33 +01:00
cpufreq.c cpufreq: Exit governor when failed to start old governor 2025-08-28 16:25:52 +02:00
cpufreq_conservative.c cpufreq: unify show() and store() naming and use __ATTR_XX 2022-03-10 19:55:05 +01:00
cpufreq_governor.c cpufreq: governor: Fix negative 'idle_time' handling in dbs_update() 2025-04-10 14:33:30 +02:00
cpufreq_governor.h cpufreq: governor: Use kobject release() method to free dbs_data 2022-04-13 15:22:41 +02:00
cpufreq_governor_attr_set.c cpufreq: Move to_gov_attr_set() to cpufreq.h 2022-02-04 19:22:34 +01:00
cpufreq_ondemand.c cpufreq: Fix setting policy limits when frequency tables are used 2025-05-09 09:41:36 +02:00
cpufreq_ondemand.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
cpufreq_performance.c cpufreq: Introduce CPUFREQ_GOV_STRICT_TARGET 2020-11-10 18:31:17 +01:00
cpufreq_powersave.c cpufreq: Introduce CPUFREQ_GOV_STRICT_TARGET 2020-11-10 18:31:17 +01:00
cpufreq_stats.c cpufreq: stats: Fix buffer overflow detection in trans_stats() 2023-11-28 17:07:16 +00:00
cpufreq_userspace.c cpufreq: Register governors at core_initcall 2020-07-02 13:03:30 +02:00
davinci-cpufreq.c cpufreq: davinci: Fix clk use after free 2023-03-10 09:33:01 +01:00
e_powersaver.c cpufreq: e_powersaver: remove unreachable break 2020-10-27 18:42:54 +01:00
elanfreq.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
freq_table.c cpufreq: Fix setting policy limits when frequency tables are used 2025-05-09 09:41:36 +02:00
gx-suspmod.c cpufreq: Avoid creating excessively large stack frames 2020-01-27 10:33:33 +01:00
highbank-cpufreq.c cpufreq: Add __init annotation to module init funcs 2022-09-26 11:15:04 +05:30
ia64-acpi-cpufreq.c ia64: fix format string for ia64-acpi-cpu-freq 2021-03-19 17:26:20 +01:00
imx-cpufreq-dt.c cpufreq: Use of_property_present() for testing DT property presence 2024-01-25 15:27:20 -08:00
imx6q-cpufreq.c cpufreq: Use of_property_present() for testing DT property presence 2024-01-25 15:27:20 -08:00
intel_pstate.c cpufreq: intel_pstate: Check turbo_is_disabled() in store_no_turbo() 2025-09-09 18:54:25 +02:00
Kconfig cpufreq: loongson2: fix Kconfig "its" grammar 2022-07-25 20:34:56 +02:00
Kconfig.arm nvmem: prefix all symbols with NVMEM_ 2022-09-24 14:54:38 +02:00
Kconfig.powerpc cpufreq: Fix Kconfig indentation 2019-11-29 11:52:02 +01:00
Kconfig.x86 cpufreq: amd-pstate: change amd-pstate driver to be built-in type 2022-11-22 19:57:15 +01:00
kirkwood-cpufreq.c cpufreq: kirkwood: convert to devm_platform_ioremap_resource 2020-01-07 13:29:58 +05:30
longhaul.c cpufreq: longhaul: Replace acpi_bus_get_device() 2022-02-04 19:31:49 +01:00
longhaul.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166 2019-05-30 11:26:39 -07:00
longrun.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
loongson1-cpufreq.c cpufreq: Remove CPUFREQ_STICKY flag 2021-02-04 19:23:20 +01:00
loongson2_cpufreq.c cpufreq: loongson2: Unregister platform_driver on failure 2024-12-14 19:53:36 +01:00
Makefile cpufreq: amd-pstate: Add test module for amd-pstate driver 2022-10-05 11:05:17 -06:00
maple-cpufreq.c Merge branch 'pm-cpufreq' 2019-07-18 09:49:30 +02:00
mediatek-cpufreq-hw.c cpufreq: mediatek-hw: Fix wrong return value in mtk_cpufreq_get_cpu_power() 2024-12-14 19:54:02 +01:00
mediatek-cpufreq.c cpufreq: mediatek: correct voltages for MT7622 and MT7623 2023-07-19 16:21:58 +02:00
mvebu-cpufreq.c treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_56.RULE (part 2) 2022-06-10 14:51:35 +02:00
omap-cpufreq.c cpufreq: omap: Use .register_em() to register with energy model 2021-08-12 09:54:07 +05:30
p4-clockmod.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
pasemi-cpufreq.c cpufreq: Prepare cleanup of powerpc's asm/prom.h 2022-04-13 17:18:45 +02:00
pcc-cpufreq.c cpufreq: pcc-cpufreq: Mark sometimes used ID structs as __maybe_unused 2020-07-15 15:17:06 +02:00
pmac32-cpufreq.c cpufreq: pmac32-cpufreq: Fix refcount leak bug 2022-06-28 13:34:51 +05:30
pmac64-cpufreq.c cpufreq: Prepare cleanup of powerpc's asm/prom.h 2022-04-13 17:18:45 +02:00
powernow-k6.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
powernow-k7.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
powernow-k7.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166 2019-05-30 11:26:39 -07:00
powernow-k8.c cpufreq: powernow-k8: Use related_cpus instead of cpus in driver.exit() 2023-09-13 09:42:30 +02:00
powernow-k8.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 347 2019-06-05 17:37:08 +02:00
powernv-cpufreq.c cpufreq: Introducing CPUFREQ_RELATION_E 2021-10-05 16:33:05 +02:00
ppc_cbe_cpufreq.c cpufreq: Explicitly include correct DT includes 2024-03-26 18:20:31 -04:00
ppc_cbe_cpufreq.h cpufreq: powerpc_cbe: Switch to QoS requests for freq limits 2019-08-26 10:02:01 +02:00
ppc_cbe_cpufreq_pervasive.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 153 2019-05-30 11:26:32 -07:00
ppc_cbe_cpufreq_pmi.c cpufreq: Explicitly include correct DT includes 2024-03-26 18:20:31 -04:00
pxa2xx-cpufreq.c cpufreq: pxa3: move clk register access to clk driver 2022-05-07 22:55:49 +02:00
pxa3xx-cpufreq.c cpufreq: pxa3: move clk register access to clk driver 2022-05-07 22:55:49 +02:00
qcom-cpufreq-hw.c cpufreq: qcom-cpufreq-hw: Revert adding cpufreq qos 2023-05-11 23:03:12 +09:00
qcom-cpufreq-nvmem.c cpufreq: qcom-nvmem: fix memory leaks in probe error paths 2024-08-11 12:35:53 +02:00
qoriq-cpufreq.c drivers: cpufreq: Add missing of_node_put() in qoriq-cpufreq.c 2022-06-28 13:34:45 +05:30
raspberrypi-cpufreq.c cpufreq: add driver for Raspberry Pi 2019-06-13 08:58:22 +05:30
s3c24xx-cpufreq-debugfs.c ARM: s3c: remove cpufreq header dependencies 2020-08-20 17:52:05 +02:00
s3c24xx-cpufreq.c cpufreq: Remove CPUFREQ_STICKY flag 2021-02-04 19:23:20 +01:00
s3c64xx-cpufreq.c cpufreq: s3c64xx: Fix compilation warning 2025-02-21 13:49:38 +01:00
s3c2410-cpufreq.c cpufreq: s3c24xx: move low-level clk reg access into platform code 2020-08-20 17:53:22 +02:00
s3c2412-cpufreq.c cpufreq: s3c24xx: move low-level clk reg access into platform code 2020-08-20 17:53:22 +02:00
s3c2416-cpufreq.c cpufreq: s3c: fix unbalances of cpufreq policy refcount 2020-01-07 13:31:01 +05:30
s3c2440-cpufreq.c cpufreq: s3c244x: add fallthrough comments for switch 2021-10-04 11:43:14 +05:30
s5pv210-cpufreq.c cpufreq: Introducing CPUFREQ_RELATION_E 2021-10-05 16:33:05 +02:00
sa1100-cpufreq.c cpufreq: Remove CPUFREQ_STICKY flag 2021-02-04 19:23:20 +01:00
sa1110-cpufreq.c cpufreq: Remove CPUFREQ_STICKY flag 2021-02-04 19:23:20 +01:00
sc520_freq.c cpufreq: sc520_freq: add 'fallthrough' to one case 2021-05-21 18:52:13 +02:00
scmi-cpufreq.c cpufreq: scmi: Skip SCMI devices that aren't used by the CPUs 2025-06-27 11:07:33 +01:00
scpi-cpufreq.c cpufreq: scpi: Fix null-ptr-deref in scpi_cpufreq_get_rate() 2025-05-02 07:46:54 +02:00
sh-cpufreq.c cpufreq: sh: Remove sh_cpufreq_cpu_ready() 2021-09-02 18:04:17 +02:00
sparc-us2e-cpufreq.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
sparc-us3-cpufreq.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
spear-cpufreq.c cpufreq: Remove CPUFREQ_STICKY flag 2021-02-04 19:23:20 +01:00
speedstep-centrino.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
speedstep-ich.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
speedstep-lib.c cpufreq: speedstep: remove unneeded semicolon 2020-10-28 18:04:07 +01:00
speedstep-lib.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166 2019-05-30 11:26:39 -07:00
speedstep-smi.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
sti-cpufreq.c cpufreq: Explicitly include correct DT includes 2024-03-26 18:20:31 -04:00
sun50i-cpufreq-nvmem.c cpufreq: sun50i: Switch to use dev_err_probe() helper 2022-10-18 16:22:26 +05:30
tegra20-cpufreq.c cpufreq: Use of_property_present() for testing DT property presence 2024-01-25 15:27:20 -08:00
tegra124-cpufreq.c cpufreq: tegra124: Add suspend and resume support 2019-10-29 13:25:29 +01:00
tegra186-cpufreq.c Revert "cpufreq: tegra186: Share policy per cluster" 2025-06-27 11:07:40 +01:00
tegra194-cpufreq.c cpufreq: tegra194: Fix module loading 2022-10-18 16:22:25 +05:30
ti-cpufreq.c cpufreq: ti-cpufreq: Introduce quirks to handle syscon fails appropriately 2024-10-17 15:20:40 +02:00
vexpress-spc-cpufreq.c cpufreq: Explicitly include correct DT includes 2024-03-26 18:20:31 -04:00