kernel/linux.git/drivers/idle, branch v6.1.168

cpuidle, intel_idle: Fix CPUIDLE_FLAG_IBRS

2025-03-13T11:53:11+00:00

[ Upstream commit 9b461a6faae7b220c32466261965778b10189e54 ] objtool to the rescue: vmlinux.o: warning: objtool: intel_idle_ibrs+0x17: call to spec_ctrl_current() leaves .noinstr.text section vmlinux.o: warning: objtool: intel_idle_ibrs+0x27: call to wrmsrl.constprop.0() leaves .noinstr.text section Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Ingo Molnar Tested-by: Tony Lindgren Tested-by: Ulf Hansson Acked-by: Rafael J. Wysocki Acked-by: Frederic Weisbecker Link: https://lore.kernel.org/r/20230112195540.556912863@infradead.org Stable-dep-of: c157d351460b ("intel_idle: Handle older CPUs, which stop the TSC in deeper C states, correctly") Signed-off-by: Sasha Levin

intel_idle: Handle older CPUs, which stop the TSC in deeper C states, correctly

2025-03-07T15:56:51+00:00

commit c157d351460bcf202970e97e611cb6b54a3dd4a4 upstream. The Intel idle driver is preferred over the ACPI processor idle driver, but fails to implement the work around for Core2 generation CPUs, where the TSC stops in C2 and deeper C-states. This causes stalls and boot delays, when the clocksource watchdog does not catch the unstable TSC before the CPU goes deep idle for the first time. The ACPI driver marks the TSC unstable when it detects that the CPU supports C2 or deeper and the CPU does not have a non-stop TSC. Add the equivivalent work around to the Intel idle driver to cure that. Fixes: 18734958e9bf ("intel_idle: Use ACPI _CST for processor models without C-state tables") Reported-by: Fab Stz Signed-off-by: Thomas Gleixner Tested-by: Fab Stz Cc: All applicable Closes: https://lore.kernel.org/all/10cf96aa-1276-4bd4-8966-c890377030c3@yahoo.fr Link: https://patch.msgid.link/87bjupfy7f.ffs@tglx Signed-off-by: Rafael J. Wysocki Signed-off-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman

intel_idle: add Emerald Rapids Xeon support

2023-10-10T20:00:44+00:00

[ Upstream commit 74528edfbc664f9d2c927c4e5a44f1285598ed0f ] Emerald Rapids (EMR) is the next Intel Xeon processor after Sapphire Rapids (SPR). EMR C-states are the same as SPR C-states, and we expect that EMR C-state characteristics (latency and target residency) will be the same as in SPR. Therefore, add EMR support by using SPR C-states table. Signed-off-by: Artem Bityutskiy Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin

Revert "cpuidle, intel_idle: Fix CPUIDLE_FLAG_IRQ_ENABLE again"

2023-04-06T10:10:58+00:00

This reverts commit 07fc78d8f0c960f7ca241de98bc8c6bfe7d200f3 which was upstream commit 6d9c7f51b1d9179bf7c3542267c656a934e8af23. Lockdep warnings on boot that are not seen with Linus's tree. Signed-off-by: Sasha Levin

cpuidle, intel_idle: Fix CPUIDLE_FLAG_IRQ_ENABLE again

2023-03-10T08:32:36+00:00

[ Upstream commit 6d9c7f51b1d9179bf7c3542267c656a934e8af23 ] So objtool found this bug: vmlinux.o: warning: objtool: intel_idle_irq+0x10c: call to trace_hardirqs_off() leaves .noinstr.text section As per commit 32d4fd5751ea ("cpuidle,intel_idle: Fix CPUIDLE_FLAG_IRQ_ENABLE"): "must not have tracing in idle functions" Clearly people can't read and tinker along until splat dissapears. This straight up reverts commit d295ad34f236 ("intel_idle: Fix false positive RCU splats due to incorrect hardirqs state"). It doesn't re-introduce the problem because preceding patches fixed it properly. Fixes: d295ad34f236 ("intel_idle: Fix false positive RCU splats due to incorrect hardirqs state") Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Ingo Molnar Tested-by: Tony Lindgren Tested-by: Ulf Hansson Acked-by: Rafael J. Wysocki Acked-by: Frederic Weisbecker Link: https://lore.kernel.org/r/20230112195540.434302128@infradead.org Signed-off-by: Sasha Levin

intel_idle: Add AlderLake-N support

2022-09-21T18:33:49+00:00

Similar to the other other AlderLake platforms, the C1 and C1E states on ADL-N are mutually exclusive. Only one of them can be enabled at a time. C1E is preferred on ADL-N for better energy efficiency. C6S is also supported on this platform. Its latency is far bigger than C6, but really close to C8 (PC8), thus it is not exposed as a separate state. Suggested-by: Baieswara Reddy Sagili Suggested-by: Vinay Kumar Signed-off-by: Zhang Rui [ rjw: Changelog edits ] Signed-off-by: Rafael J. Wysocki

intel_idle: move from strlcpy() with unused retval to strscpy()

2022-08-31T19:12:03+00:00

Follow the advice of the below link and prefer 'strscpy' in this subsystem. Conversion is 1:1 because the return value is not used. Generated by a coccinelle script. Link: https://lore.kernel.org/r/CAHk-=wgfRnXz0W3D37d01q3JFkr_i_uTL=V6A6G1oUZcprmknw@mail.gmail.com/ Signed-off-by: Wolfram Sang Signed-off-by: Rafael J. Wysocki

Merge tag 'pm-5.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

2022-08-02T18:17:00+00:00

Pull power management updates from Rafael Wysocki: "These are mostly minor improvements all over including new CPU IDs for the Intel RAPL driver, an Energy Model rework to use micro-Watt as the power unit, cpufreq fixes and cleanus, cpuidle updates, devfreq updates, documentation cleanups and a new version of the pm-graph suite of utilities. Specifics: - Make cpufreq_show_cpus() more straightforward (Viresh Kumar). - Drop unnecessary CPU hotplug locking from store() used by cpufreq sysfs attributes (Viresh Kumar). - Make the ACPI cpufreq driver support the boost control interface on Zhaoxin/Centaur processors (Tony W Wang-oc). - Print a warning message on attempts to free an active cpufreq policy which should never happen (Viresh Kumar). - Fix grammar in the Kconfig help text for the loongson2 cpufreq driver (Randy Dunlap). - Use cpumask_var_t for an on-stack CPU mask in the ondemand cpufreq governor (Zhao Liu). - Add trace points for guest_halt_poll_ns grow/shrink to the haltpoll cpuidle driver (Eiichi Tsukata). - Modify intel_idle to treat C1 and C1E as independent idle states on Sapphire Rapids (Artem Bityutskiy). - Extend support for wakeirq to callback wrappers used during system suspend and resume (Ulf Hansson). - Defer waiting for device probe before loading a hibernation image till the first actual device access to avoid possible deadlocks reported by syzbot (Tetsuo Handa). - Unify device_init_wakeup() for PM_SLEEP and !PM_SLEEP (Bjorn Helgaas). - Add Raptor Lake-P to the list of processors supported by the Intel RAPL driver (George D Sworo). - Add Alder Lake-N and Raptor Lake-P to the list of processors for which Power Limit4 is supported in the Intel RAPL driver (Sumeet Pawnikar). - Make pm_genpd_remove() check genpd_debugfs_dir against NULL before attempting to remove it (Hsin-Yi Wang). - Change the Energy Model code to represent power in micro-Watts and adjust its users accordingly (Lukasz Luba). - Add new devfreq driver for Mediatek CCI (Cache Coherent Interconnect) (Johnson Wang). - Convert the Samsung Exynos SoC Bus bindings to DT schema of exynos-bus.c (Krzysztof Kozlowski). - Address kernel-doc warnings by adding the description for unused function parameters in devfreq core (Mauro Carvalho Chehab). - Use NULL to pass a null pointer rather than zero according to the function propotype in imx-bus.c (Colin Ian King). - Print error message instead of error interger value in tegra30-devfreq.c (Dmitry Osipenko). - Add checks to prevent setting negative frequency QoS limits for CPUs (Shivnandan Kumar). - Update the pm-graph suite of utilities to the latest revision 5.9 including multiple improvements (Todd Brandt). - Drop pme_interrupt reference from the PCI power management documentation (Mario Limonciello)" * tag 'pm-5.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (27 commits) powercap: RAPL: Add Power Limit4 support for Alder Lake-N and Raptor Lake-P PM: QoS: Add check to make sure CPU freq is non-negative PM: hibernate: defer device probing when resuming from hibernation intel_idle: make SPR C1 and C1E be independent cpufreq: ondemand: Use cpumask_var_t for on-stack cpu mask cpufreq: loongson2: fix Kconfig "its" grammar pm-graph v5.9 cpufreq: Warn users while freeing active policy cpufreq: scmi: Support the power scale in micro-Watts in SCMI v3.1 firmware: arm_scmi: Get detailed power scale from perf Documentation: EM: Switch to micro-Watts scale PM: EM: convert power field to micro-Watts precision and align drivers PM / devfreq: tegra30: Add error message for devm_devfreq_add_device() PM / devfreq: imx-bus: use NULL to pass a null pointer rather than zero PM / devfreq: shut up kernel-doc warnings dt-bindings: interconnect: samsung,exynos-bus: convert to dtschema PM / devfreq: mediatek: Introduce MediaTek CCI devfreq driver dt-bindings: interconnect: Add MediaTek CCI dt-bindings PM: domains: Ensure genpd_debugfs_dir exists before remove PM: runtime: Extend support for wakeirq for force_suspend|resume ...

Merge tag 'x86_fpu_for_v6.0_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2022-08-01T16:36:18+00:00

Pull x86 fpu update from Borislav Petkov: - Add machinery to initialize AMX register state in order for AMX-capable CPUs to be able to enter deeper low-power state * tag 'x86_fpu_for_v6.0_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: intel_idle: Add a new flag to initialize the AMX state x86/fpu: Add a helper to prepare AMX state for low-power CPU idle

Merge back cpuidle material for 5.20.

2022-07-29T15:15:30+00:00