CSD lockup during kexec due to unbounded busy-wait in pl011_console_write_atomic

Documentation/ABI/testing/sysfs-devices-system-cpu

@@ -327,6 +327,52 @@ Description:	Energy performance preference
 
 		This file is only present if the cppc-cpufreq driver is in use.
 
+What:		/sys/devices/system/cpu/cpuX/cpufreq/min_perf
+Date:		December 2025
+Contact:	linux-pm@vger.kernel.org
+Description:	Minimum Performance Frequency
+
+		Read/write a frequency value in kHz from/to this file. This
+		file conveys the minimum performance level (as frequency) at
+		which the platform may run. The frequency value is internally
+		converted to a performance value and must correspond to a
+		performance level in the range [Lowest Performance, Highest
+		Performance], inclusive. The minimum must be less than or equal
+		to the maximum performance. The performance range can be checked
+		from nodes:
+			/sys/devices/system/cpu/cpuX/acpi_cppc/highest_perf
+			/sys/devices/system/cpu/cpuX/acpi_cppc/lowest_perf
+
+		This file is only present if the cppc-cpufreq driver is in use.
+
+What:		/sys/devices/system/cpu/cpuX/cpufreq/max_perf
+Date:		December 2025
+Contact:	linux-pm@vger.kernel.org
+Description:	Maximum Performance Frequency
+
+		Read/write a frequency value in kHz from/to this file. This
+		file conveys the maximum performance level (as frequency) at
+		which the platform may run. The frequency value is internally
+		converted to a performance value and must correspond to a
+		performance level in the range [Lowest Performance, Highest
+		Performance], inclusive. The performance range can be checked
+		from nodes:
+			/sys/devices/system/cpu/cpuX/acpi_cppc/highest_perf
+			/sys/devices/system/cpu/cpuX/acpi_cppc/lowest_perf
+
+		This file is only present if the cppc-cpufreq driver is in use.
+
+What:		/sys/devices/system/cpu/cpuX/cpufreq/perf_limited
+Date:		December 2025
+Contact:	linux-pm@vger.kernel.org
+Description:	Performance Limited
+
+		Read/write a 32 bits value from/to this file. This file indicates
+		to OSPM that an unpredictable event has limited processor
+		performance, and the delivered performance may be less than
+		desired/minimum performance.
+
+		This file is only present if the cppc-cpufreq driver is in use.
 
 What:		/sys/devices/system/cpu/cpu*/cache/index3/cache_disable_{0,1}
 Date:		August 2008

Documentation/admin-guide/kernel-parameters.txt

@@ -911,6 +911,18 @@
 			Format:
 			<first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>]
 
+	cppc_cpufreq.auto_sel_mode=
+			[CPU_FREQ] Enable ACPI CPPC autonomous performance selection.
+			When enabled, hardware automatically adjusts CPU frequency
+			on all CPUs based on workload demands. In Autonomous mode,
+			Energy Performance Preference(EPP) hints guide hardware
+			toward performance(0x0) or energy efficiency (0xff).
+			Requires ACPI CPPC autonomous selection register support.
+			Format: <bool>
+			Default: 0 (disabled)
+			0: use cpufreq governors
+			1: enable if supoorted by hardware
+
 	cpuidle.off=1	[CPU_IDLE]
 			disable the cpuidle sub-system
 
@@ -6161,7 +6173,7 @@
 	rdt=		[HW,X86,RDT]
 			Turn on/off individual RDT features. List is:
 			cmt, mbmtotal, mbmlocal, l3cat, l3cdp, l2cat, l2cdp,
-			mba, smba, bmec.
+			mba, smba, bmec, abmc.
 			E.g. to turn on cmt and turn off mba use:
 				rdt=cmt,!mba
 

Documentation/admin-guide/perf/index.rst

@@ -24,7 +24,8 @@ Performance monitor support
    thunderx2-pmu
    alibaba_pmu
    dwc_pcie_pmu
-   nvidia-pmu
+   nvidia-tegra241-pmu
+   nvidia-tegra410-pmu
    meson-ddr-pmu
    cxl
    ampere_cspmu

Documentation/admin-guide/perf/nvidia-pmu.rst → Documentation/admin-guide/perf/nvidia-tegra241-pmu.rst

@@ -1,8 +1,8 @@
-=========================================================
-NVIDIA Tegra SoC Uncore Performance Monitoring Unit (PMU)
-=========================================================
+============================================================
+NVIDIA Tegra241 SoC Uncore Performance Monitoring Unit (PMU)
+============================================================
 
-The NVIDIA Tegra SoC includes various system PMUs to measure key performance
+The NVIDIA Tegra241 SoC includes various system PMUs to measure key performance
 metrics like memory bandwidth, latency, and utilization:
 
 * Scalable Coherency Fabric (SCF)