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d3c3db41df
linux/arch/arm64/kernel
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Pierre Gondois d3c3db41df cpufreq: CPPC: Add per_cpu efficiency_class 
In ACPI, describing power efficiency of CPUs can be done through the
following arm specific field:
ACPI 6.4, s5.2.12.14 'GIC CPU Interface (GICC) Structure',
'Processor Power Efficiency Class field':
  Describes the relative power efficiency of the associated pro-
  cessor. Lower efficiency class numbers are more efficient than
  higher ones (e.g. efficiency class 0 should be treated as more
  efficient than efficiency class 1). However, absolute values
  of this number have no meaning: 2 isn’t necessarily half as
  efficient as 1.

The efficiency_class field is stored in the GicC structure of the
ACPI MADT table and it's currently supported in Linux for arm64 only.
Thus, this new functionality is introduced for arm64 only.

To allow the cppc_cpufreq driver to know and preprocess the
efficiency_class values of all the CPUs, add a per_cpu efficiency_class
variable to store them.

At least 2 different efficiency classes must be present,
otherwise there is no use in creating an Energy Model.

The efficiency_class values are squeezed in [0:#efficiency_class-1]
while conserving the order. For instance, efficiency classes of:
  [111, 212, 250]
will be mapped to:
  [0 (was 111), 1 (was 212), 2 (was 250)].

Each policy being independently registered in the driver, populating
the per_cpu efficiency_class is done only once at the driver
initialization. This prevents from having each policy re-searching the
efficiency_class values of other CPUs. The EM will be registered in a
following patch.

The patch also exports acpi_cpu_get_madt_gicc() to fetch the GicC
structure of the ACPI MADT table for each CPU.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2022-05-06 21:01:17 +02:00
..
probes arm64: kprobes: Make a frame pointer on __kretprobe_trampoline 2021-10-22 12:16:53 -04:00
vdso arm64: vdso: Fix "no previous prototype" warning 2022-01-24 12:08:28 +00:00
vdso32 Kbuild: move to -std=gnu11 2022-03-13 17:31:37 +09:00
.gitignore
acpi_numa.c arm64, numa: Change the numa init functions name to be generic 2021-01-14 15:08:54 -08:00
acpi_parking_protocol.c arm64: use function_nocfi with __pa_symbol 2021-04-08 16:04:22 -07:00
acpi.c arm64: Simplify checking for populated DT 2021-12-06 16:12:53 +00:00
alternative.c arm64: alternatives: mark patch_alternative() as noinstr 2022-04-06 11:23:48 +01:00
armv8_deprecated.c arm64: extable: add a dedicated uaccess handler 2021-10-21 10:45:22 +01:00
asm-offsets.c KVM: arm64: Drop unused workaround_flags vcpu field 2021-12-08 14:54:07 +00:00
cacheinfo.c drivers: base: cacheinfo: Get rid of DEFINE_SMP_CALL_CACHE_FUNCTION() 2021-09-01 10:29:10 +02:00
cpu_errata.c arm64 updates for 5.18 2022-03-21 10:46:39 -07:00
cpu_ops.c
cpu-reset.S arm64: kexec: remove cpu-reset.h 2021-10-01 13:31:00 +01:00
cpufeature.c Merge branch 'for-next/spectre-bhb' into for-next/core 2022-03-14 19:08:31 +00:00
cpuidle.c cpuidle: PSCI: Move the has_lpi check to the beginning of the function 2022-03-03 20:20:06 +01:00
cpuinfo.c arm64/mte: Add hwcap for asymmetric mode 2022-02-25 14:41:05 +00:00
crash_core.c arm64: crash_core: Export MODULES, VMALLOC, and VMEMMAP ranges 2022-03-07 21:25:47 +00:00
crash_dump.c arm64: kdump: update ppos when reading elfcorehdr 2021-03-22 12:46:38 +00:00
debug-monitors.c arm64: expose FAR_EL1 tag bits in siginfo 2020-11-23 18:17:39 +00:00
efi-entry.S arm64: Rename arm64-internal cache maintenance functions 2021-05-25 19:27:49 +01:00
efi-header.S arm64: head: tidy up the Image header definition 2020-11-17 16:14:20 +00:00
efi-rt-wrapper.S
efi.c arm64: efi: Export screen_info 2021-08-04 16:54:36 +00:00
elfcore.c arm64: mte: Fix the stack frame size warning in mte_dump_tag_range() 2022-04-04 09:59:27 +01:00
entry-common.c Changes in this cycle were: 2022-03-22 14:39:12 -07:00
entry-fpsimd.S arm64/sve: Explicitly load vector length when restoring SVE state 2021-10-21 10:18:17 +01:00
entry-ftrace.S arm64: Use BTI C directly and unconditionally 2021-12-14 18:12:58 +00:00
entry.S Merge branch 'for-next/spectre-bhb' into for-next/core 2022-03-14 19:08:31 +00:00
fpsimd.c arm64/fpsimd: Clarify the purpose of using last in fpsimd_save() 2022-02-08 14:43:22 +00:00
ftrace.c arm64: ftrace: use HAVE_FUNCTION_GRAPH_RET_ADDR_PTR 2021-11-16 09:47:54 +00:00
head.S sched: move CPU field back into thread_info if THREAD_INFO_IN_TASK=y 2021-09-30 16:13:10 +02:00
hibernate-asm.S arm64: kexec: install a copy of the linear-map 2021-10-01 13:31:00 +01:00
hibernate.c arm64: Drop outdated links in comments 2022-01-05 11:51:01 +00:00
hw_breakpoint.c arm64: fix typos in comments 2022-04-04 10:32:50 +01:00
hyp-stub.S Merge remote-tracking branch 'arm64/for-next/vhe-only' into kvmarm-master/next 2021-04-13 15:42:40 +01:00
idle.c Merge branch 'for-next/entry' into for-next/core 2021-06-24 14:01:55 +01:00
idreg-override.c arm64: Add support of PAuth QARMA3 architected algorithm 2022-02-25 13:38:52 +00:00
image-vars.h ARM: 2022-03-24 11:58:57 -07:00
image.h
io.c
irq.c arm64: irq: allow FIQs to be handled 2021-03-24 20:19:30 +00:00
jump_label.c arm64: insn: decouple patching from insn code 2021-06-11 11:19:27 +01:00
kaslr.c arm64: fix the doc of RANDOMIZE_MODULE_REGION_FULL 2021-08-03 10:36:42 +01:00
kexec_image.c arm64: kexec_file: Fix sparse warning 2020-11-10 13:11:44 +00:00
kgdb.c arm64: insn: decouple patching from insn code 2021-06-11 11:19:27 +01:00
kuser32.S
machine_kexec_file.c arm64: kexec: Fix missing error code 'ret' warning in load_other_segments() 2021-12-16 17:44:58 +00:00
machine_kexec.c Merge branches 'for-next/misc', 'for-next/cache-ops-dzp', 'for-next/stacktrace', 'for-next/xor-neon', 'for-next/kasan', 'for-next/armv8_7-fp', 'for-next/atomics', 'for-next/bti', 'for-next/sve', 'for-next/kselftest' and 'for-next/kcsan', remote-tracking branch 'arm64/for-next/perf' into for-next/core 2022-01-05 18:14:32 +00:00
Makefile arm64: mte: Dump the MTE tags in the core file 2022-02-15 22:53:29 +00:00
module-plts.c arm64: fix typos in comments 2022-04-04 10:32:50 +01:00
module.c kasan, arm64: don't tag executable vmalloc allocations 2022-03-24 19:06:48 -07:00
mte.c arm64/mte: Remove asymmetric mode from the prctl() interface 2022-03-09 18:14:56 +00:00
paravirt.c x86/paravirt: Switch time pvops functions to use static_call() 2021-03-11 16:17:52 +01:00
patching.c arm64: patch_text: Fixup last cpu should be master 2022-04-08 11:43:46 +01:00
pci.c arm64: PCI: Support root bridge preparation for Hyper-V 2021-08-23 10:59:26 +01:00
perf_callchain.c Peter Zijlstra says: 2022-01-12 16:26:58 -08:00
perf_event.c arm64: perf: Expose some Armv9 common events under sysfs 2022-03-08 11:40:44 +00:00
perf_regs.c perf/arch: Remove perf_sample_data::regs_user_copy 2020-11-09 18:12:34 +01:00
pointer_auth.c arm64: move preemption disablement to prctl handlers 2021-07-28 18:33:49 +01:00
process.c arm64/mte: Remove asymmetric mode from the prctl() interface 2022-03-09 18:14:56 +00:00
proton-pack.c arm64: Add part number for Arm Cortex-A78AE 2022-04-08 11:46:46 +01:00
psci.c arm64: use function_nocfi with __pa_symbol 2021-04-08 16:04:22 -07:00
ptrace.c ptrace: Create ptrace_report_syscall_{entry,exit} in ptrace.h 2022-03-10 13:35:08 -06:00
reloc_test_core.c
reloc_test_syms.S
relocate_kernel.S arm64: kexec: keep MMU enabled during kexec relocation 2021-10-01 13:31:00 +01:00
return_address.c arm64: Make return_address() use arch_stack_walk() 2021-12-10 14:06:04 +00:00
sdei.c arm64: kernel: add helper for booted at EL2 and not VHE 2021-10-01 13:30:59 +01:00
setup.c drivers/base/node: consolidate node device subsystem initialization in node_dev_init() 2022-03-22 15:57:10 -07:00
signal32.c arm64 updates for 5.15: 2021-09-01 15:04:29 -07:00
signal.c ptrace: Cleanups for v5.18 2022-03-28 17:29:53 -07:00
sigreturn32.S
sleep.S kasan: remove redundant config option 2021-04-16 16:10:36 -07:00
smccc-call.S arm64: smccc: Save lr before calling __arm_smccc_sve_check() 2021-07-21 11:23:25 +01:00
smp_spin_table.c arm64: Rename arm64-internal cache maintenance functions 2021-05-25 19:27:49 +01:00
smp.c cpufreq: CPPC: Add per_cpu efficiency_class 2022-05-06 21:01:17 +02:00
stacktrace.c arm64: Mark start_backtrace() notrace and NOKPROBE_SYMBOL 2022-01-24 14:25:20 +00:00
suspend.c arm64: fix typos in comments 2022-04-04 10:32:50 +01:00
sys32.c
sys_compat.c arm64: drop unused includes of <linux/personality.h> 2022-03-08 10:23:42 +00:00
sys.c
syscall.c arm64: Snapshot thread flags 2021-12-01 00:06:44 +01:00
time.c arm64: Make profile_pc() use arch_stack_walk() 2021-12-10 14:06:04 +00:00
topology.c topology: Represent clusters of CPUs within a die 2021-10-15 11:25:15 +02:00
trace-events-emulation.h
traps.c asm-generic updates for 5.18 2022-03-23 18:03:08 -07:00
vdso32-wrap.S arm64: do not descend to vdso directories twice 2021-01-20 12:18:46 +00:00
vdso-wrap.S arm64: do not descend to vdso directories twice 2021-01-20 12:18:46 +00:00
vdso.c Merge branches 'for-next/misc', 'for-next/kselftest', 'for-next/xntable', 'for-next/vdso', 'for-next/fiq', 'for-next/epan', 'for-next/kasan-vmalloc', 'for-next/fgt-boot-init', 'for-next/vhe-only' and 'for-next/neon-softirqs-disabled', remote-tracking branch 'arm64/for-next/perf' into for-next/core 2021-04-15 14:00:38 +01:00
vmlinux.lds.S arm64: entry: Allow the trampoline text to occupy multiple pages 2022-02-15 17:40:28 +00:00