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linux/drivers/cpufreq
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Srinivas Pandruvada 4b747cc628 cpufreq: intel_pstate: Check IDA only before MSR_IA32_PERF_CTL writes 
Commit ac4e04d9e3 ("cpufreq: intel_pstate: Unchecked MSR aceess in
legacy mode") introduced a check for feature X86_FEATURE_IDA to verify
turbo mode support. Although this is the correct way to check for turbo
mode support, it causes issues on some platforms that disable turbo
during OS boot, but enable it later [1]. Before adding this feature
check, users were able to get turbo mode frequencies by writing 0 to
/sys/devices/system/cpu/intel_pstate/no_turbo post-boot.

To restore the old behavior on the affected systems while still
addressing the unchecked MSR issue on some Skylake-X systems, check
X86_FEATURE_IDA only immediately before updates of MSR_IA32_PERF_CTL
that may involve setting the Turbo Engage Bit (bit 32).

Fixes: ac4e04d9e3 ("cpufreq: intel_pstate: Unchecked MSR aceess in legacy mode")
Reported-by: Aaron Rainbolt <arainbolt@kfocus.org>
Closes: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2122531 [1]
Tested-by: Aaron Rainbolt <arainbolt@kfocus.org>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
[ rjw: Subject adjustment, changelog edits ]
Link: https://patch.msgid.link/20251111010840.141490-1-srinivas.pandruvada@linux.intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
 		2025-11-12 17:59:37 +01:00
..
Kconfig cpufreq: Add Rust-based cpufreq-dt driver 2025-05-20 11:21:11 +05:30
Kconfig.arm cpufreq: tegra124: Allow building as a module 2025-07-09 13:41:58 +05:30
Kconfig.powerpc cpufreq: ppc_cbe: Remove powerpc Cell driver 2025-02-26 21:15:09 +05:30
Kconfig.x86 cpufreq: Introduce an optional cpuinfo_avg_freq sysfs entry 2025-02-17 18:09:31 +00:00
Makefile PM: cpufreq: powernv/tracing: Move powernv_throttle trace event 2025-07-21 16:40:56 -04:00
acpi-cpufreq.c cpufreq: ACPI: Use on_each_cpu_mask() in drv_write() 2025-09-15 21:43:31 +02:00
airoha-cpufreq.c cpufreq: airoha: Add support for AN7583 SoC 2025-08-11 12:19:20 +05:30
amd-pstate-trace.c
…
amd-pstate-trace.h cpufreq/amd-pstate: Move all EPP tracing into *_update_perf and *_set_epp functions 2025-03-06 13:01:25 -06:00
amd-pstate-ut.c Power management updates for 6.16-rc1 2025-05-27 16:48:47 -07:00
amd-pstate.c cpufreq/amd-pstate: Fix a regression leading to EPP 0 after hibernate 2025-10-15 08:21:16 -05:00
amd-pstate.h amd-pstate-ut: Reset amd-pstate driver mode after running selftests 2025-05-05 12:07:42 -05:00
amd_freq_sensitivity.c x86/msr: Rename 'rdmsrl_safe()' to 'rdmsrq_safe()' 2025-04-10 11:58:38 +02:00
apple-soc-cpufreq.c cpufreq: apple-soc: Fix null-ptr-deref in apple_soc_cpufreq_get_rate() 2025-04-10 10:07:32 +05:30
armada-8k-cpufreq.c cpufreq: armada-8k: Fix off by one in armada_8k_cpufreq_free_table() 2025-07-02 12:08:16 +05:30
armada-37xx-cpufreq.c cpufreq: armada-37xx: use max() to calculate target_vm 2025-08-11 12:19:29 +05:30
bmips-cpufreq.c cpufreq: bmips: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:11 +05:30
brcmstb-avs-cpufreq.c cpufreq: brcmstb-avs: Use scope-based cleanup helper 2025-08-29 11:28:27 +05:30
cppc_cpufreq.c ACPI: CPPC: Do not use CPUFREQ_ETERNAL as an error value 2025-10-01 13:57:13 +02:00
cpufreq-dt-platdev.c cpufreq: dt-platdev: Blacklist ti,am62d2 SoC 2025-08-20 14:06:06 +05:30
cpufreq-dt.c cpufreq: Make drivers using CPUFREQ_ETERNAL specify transition latency 2025-10-01 13:56:24 +02:00
cpufreq-dt.h cpufreq: dt: Add register helper 2025-07-09 13:41:33 +05:30
cpufreq-nforce2.c cpufreq: nforce2: Remove empty exit() callback 2024-07-05 11:41:30 +05:30
cpufreq.c Merge back earlier cpufreq material for 6.18 2025-09-24 21:32:28 +02:00
cpufreq_conservative.c cpufreq: conservative: Replace sscanf() with kstrtouint() 2025-09-10 12:20:10 +02:00
cpufreq_governor.c cpufreq: governor: Fix negative 'idle_time' handling in dbs_update() 2025-02-20 20:27:19 +01:00
cpufreq_governor.h
…
cpufreq_governor_attr_set.c
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cpufreq_ondemand.c cpufreq: ondemand: Update the efficient idle check for Intel extended Families 2025-09-10 12:25:08 +02:00
cpufreq_ondemand.h cpufreq: ondemand: Update the efficient idle check for Intel extended Families 2025-09-10 12:25:08 +02:00
cpufreq_performance.c
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cpufreq_powersave.c
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cpufreq_stats.c
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cpufreq_userspace.c cpufreq: userspace: set CPUFREQ_GOV_STRICT_TARGET flag 2025-06-18 21:33:01 +02:00
davinci-cpufreq.c cpufreq: davinci: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:12 +05:30
e_powersaver.c x86/msr: Rename 'wrmsrl()' to 'wrmsrq()' 2025-04-10 11:58:33 +02:00
elanfreq.c x86/msr: Add explicit includes of <asm/msr.h> 2025-05-02 10:23:47 +02:00
freq_table.c cpufreq: Replace pointer subtraction with iteration macro 2025-09-23 17:16:56 +02:00
gx-suspmod.c
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highbank-cpufreq.c
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imx-cpufreq-dt.c cpufreq: Switch back to struct platform_driver::remove() 2024-10-28 12:24:39 +01:00
imx6q-cpufreq.c cpufreq: Make drivers using CPUFREQ_ETERNAL specify transition latency 2025-10-01 13:56:24 +02:00
intel_pstate.c cpufreq: intel_pstate: Check IDA only before MSR_IA32_PERF_CTL writes 2025-11-12 17:59:37 +01:00
kirkwood-cpufreq.c cpufreq: kirkwood: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:12 +05:30
longhaul.c cpufreq/longhaul: handle NULL policy in longhaul_exit 2025-09-01 10:50:28 +05:30
longhaul.h
…
longrun.c
…
loongson2_cpufreq.c cpufreq: loongson: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:12 +05:30
loongson3_cpufreq.c cpufreq: loongson: Set .set_boost directly 2025-02-07 09:45:15 +05:30
mediatek-cpufreq-hw.c cpufreq: Make drivers using CPUFREQ_ETERNAL specify transition latency 2025-10-01 13:56:24 +02:00
mediatek-cpufreq.c cpufreq: mediatek: fix device leak on probe failure 2025-09-29 14:40:46 +05:30
mvebu-cpufreq.c cpufreq: Init cpufreq only for present CPUs 2025-03-17 11:29:18 +05:30
omap-cpufreq.c cpufreq: omap: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:12 +05:30
p4-clockmod.c cpufreq: p4: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:12 +05:30
pasemi-cpufreq.c cpufreq: pasemi: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:12 +05:30
pcc-cpufreq.c cpufreq: Switch back to struct platform_driver::remove() 2024-10-28 12:24:39 +01:00
pmac32-cpufreq.c cpufreq: pmac: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:13 +05:30
pmac64-cpufreq.c cpufreq: pmac: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:13 +05:30
powernow-k6.c cpufreq: powernow: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:13 +05:30
powernow-k7.c x86/msr: Rename 'wrmsrl()' to 'wrmsrq()' 2025-04-10 11:58:33 +02:00
powernow-k7.h
…
powernow-k8.c powernow: use pr_info_once 2025-05-11 17:54:05 -07:00
powernow-k8.h
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powernv-cpufreq.c PM: cpufreq: powernv/tracing: Move powernv_throttle trace event 2025-07-21 16:40:56 -04:00
powernv-trace.h PM: cpufreq: powernv/tracing: Move powernv_throttle trace event 2025-07-21 16:40:56 -04:00
pxa2xx-cpufreq.c
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pxa3xx-cpufreq.c
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qcom-cpufreq-hw.c cpufreq: Init cpufreq only for present CPUs 2025-03-17 11:29:18 +05:30
qcom-cpufreq-nvmem.c cpufreq: qcom-nvmem: Enable cpufreq for ipq5424 2025-08-11 12:30:46 +05:30
qoriq-cpufreq.c cpufreq: qoriq: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:13 +05:30
raspberrypi-cpufreq.c cpufreq: Switch back to struct platform_driver::remove() 2024-10-28 12:24:39 +01:00
rcpufreq_dt.rs CPUFreq fixes for 6.18 2025-10-01 13:59:28 +02:00
s3c64xx-cpufreq.c cpufreq: s3c64xx: Fix compilation warning 2025-01-23 20:47:32 +01:00
s5pv210-cpufreq.c cpufreq: s5pv210: Use scope-based cleanup helper 2025-08-29 11:42:24 +05:30
sa1110-cpufreq.c
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sc520_freq.c x86/msr: Add explicit includes of <asm/msr.h> 2025-05-02 10:23:47 +02:00
scmi-cpufreq.c cpufreq: Make drivers using CPUFREQ_ETERNAL specify transition latency 2025-10-01 13:56:24 +02:00
scpi-cpufreq.c cpufreq: Make drivers using CPUFREQ_ETERNAL specify transition latency 2025-10-01 13:56:24 +02:00
sh-cpufreq.c cpufreq: Drop redundant freq_table parameter 2025-09-05 20:16:55 +02:00
sparc-us2e-cpufreq.c cpufreq: sparc: change kzalloc to kcalloc 2024-12-24 09:48:58 +05:30
sparc-us3-cpufreq.c cpufreq: sparc: change kzalloc to kcalloc 2024-12-24 09:48:58 +05:30
spear-cpufreq.c cpufreq: Make drivers using CPUFREQ_ETERNAL specify transition latency 2025-10-01 13:56:24 +02:00
speedstep-centrino.c cpufreq: speedstep: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:14 +05:30
speedstep-ich.c cpufreq: speedstep: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:14 +05:30
speedstep-lib.c cpufreq: speedstep-lib: Use int type to store negative error codes 2025-09-05 20:28:46 +02:00
speedstep-lib.h cpufreq: speedstep-lib: Use int type to store negative error codes 2025-09-05 20:28:46 +02:00
speedstep-smi.c cpufreq: speedstep: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:14 +05:30
sti-cpufreq.c cpufreq: Use of_property_present() 2024-08-07 12:11:45 +05:30
sun50i-cpufreq-nvmem.c cpufreq: sun50i: prevent out-of-bounds access 2025-04-08 11:35:30 +05:30
tegra20-cpufreq.c
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tegra124-cpufreq.c drivers: cpufreq: add Tegra114 support 2025-07-15 08:37:35 +05:30
tegra186-cpufreq.c cpufreq: tegra186: Initialize all cores to max frequencies 2025-09-29 14:55:50 +05:30
tegra194-cpufreq.c cpufreq: tegra: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:14 +05:30
ti-cpufreq.c cpufreq: ti: Allow all silicon revisions to support OPPs 2025-08-22 12:24:13 +05:30
vexpress-spc-cpufreq.c cpufreq: vexpress: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:14 +05:30
virtual-cpufreq.c cpufreq: Drop redundant freq_table parameter 2025-09-05 20:16:55 +02:00