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(kernel-rolling) arch: Add LoongArch CPU Frequency Scaling (cpufreq) support #182

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(kernel-rolling) arch: Add LoongArch CPU Frequency Scaling (cpufreq) support #182

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6356b4d
cpufreq: Add cpufreq driver for LoongArch
May 14, 2024
caebfb9
LoongArch: update defconfig for cpufreq
May 14, 2024
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1 change: 1 addition & 0 deletions arch/loongarch/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -682,6 +682,7 @@ config ARCH_SUSPEND_POSSIBLE
config ARCH_HIBERNATION_POSSIBLE
def_bool y

source "drivers/cpufreq/Kconfig"
source "kernel/power/Kconfig"
source "drivers/acpi/Kconfig"

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4 changes: 4 additions & 0 deletions arch/loongarch/configs/deepin_loongarch_desktop_defconfig
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Expand Up @@ -70,6 +70,10 @@ CONFIG_ACPI_TAD=m
CONFIG_ACPI_DOCK=y
CONFIG_ACPI_IPMI=m
CONFIG_ACPI_PCI_SLOT=y
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_STAT=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=y
CONFIG_LOONGSON3_ACPI_CPUFREQ=y
CONFIG_ACPI_HOTPLUG_MEMORY=y
CONFIG_ACPI_HED=y
CONFIG_ACPI_CUSTOM_METHOD=y
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4 changes: 4 additions & 0 deletions arch/loongarch/configs/loongson3_defconfig
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Expand Up @@ -65,6 +65,10 @@ CONFIG_ACPI_DOCK=y
CONFIG_ACPI_IPMI=m
CONFIG_ACPI_HOTPLUG_CPU=y
CONFIG_ACPI_PCI_SLOT=y
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_STAT=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=y
CONFIG_LOONGSON3_ACPI_CPUFREQ=y
CONFIG_ACPI_HOTPLUG_MEMORY=y
CONFIG_VIRTUALIZATION=y
CONFIG_KVM=m
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13 changes: 12 additions & 1 deletion arch/loongarch/include/asm/fpu.h
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Expand Up @@ -48,6 +48,10 @@ static inline void disable_lasx(void);
static inline void save_lasx(struct task_struct *t);
static inline void restore_lasx(struct task_struct *t);

#ifdef CONFIG_LOONGSON3_ACPI_CPUFREQ
DECLARE_PER_CPU(unsigned long, lsx_count);
DECLARE_PER_CPU(unsigned long, lasx_count);
#endif
/*
* Mask the FCSR Cause bits according to the Enable bits, observing
* that Unimplemented is always enabled.
Expand Down Expand Up @@ -210,6 +214,9 @@ static inline void enable_lsx(void)
{
if (cpu_has_lsx)
csr_xchg32(CSR_EUEN_LSXEN, CSR_EUEN_LSXEN, LOONGARCH_CSR_EUEN);
#ifdef CONFIG_LOONGSON3_ACPI_CPUFREQ
per_cpu(lsx_count, raw_smp_processor_id())++;
#endif
}

static inline void disable_lsx(void)
Expand Down Expand Up @@ -256,8 +263,12 @@ static inline void restore_lsx_upper(struct task_struct *t) {}
static inline void enable_lasx(void)
{

if (cpu_has_lasx)
if (cpu_has_lasx) {
csr_xchg32(CSR_EUEN_LASXEN, CSR_EUEN_LASXEN, LOONGARCH_CSR_EUEN);
#ifdef CONFIG_LOONGSON3_ACPI_CPUFREQ
per_cpu(lasx_count, raw_smp_processor_id())++;
#endif
}
}

static inline void disable_lasx(void)
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11 changes: 11 additions & 0 deletions drivers/cpufreq/Kconfig
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Expand Up @@ -262,6 +262,17 @@ config LOONGSON2_CPUFREQ
If in doubt, say N.
endif

if LOONGARCH
config LOONGSON3_ACPI_CPUFREQ
bool "Loongson3 ACPI cpufreq driver"
depends on ACPI_PROCESSOR
help
This driver adds a CPUFreq driver which utilizes the ACPI
Processor Performance States.
This driver supports Loongson 3A5000 compatible CPUs.
If in doubt, say N.
endif

if SPARC64
config SPARC_US3_CPUFREQ
tristate "UltraSPARC-III CPU Frequency driver"
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1 change: 1 addition & 0 deletions drivers/cpufreq/Makefile
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Expand Up @@ -103,6 +103,7 @@ obj-$(CONFIG_POWERNV_CPUFREQ) += powernv-cpufreq.o
# Other platform drivers
obj-$(CONFIG_BMIPS_CPUFREQ) += bmips-cpufreq.o
obj-$(CONFIG_LOONGSON2_CPUFREQ) += loongson2_cpufreq.o
obj-$(CONFIG_LOONGSON3_ACPI_CPUFREQ) += loongson3-acpi-cpufreq.o
obj-$(CONFIG_SH_CPU_FREQ) += sh-cpufreq.o
obj-$(CONFIG_SPARC_US2E_CPUFREQ) += sparc-us2e-cpufreq.o
obj-$(CONFIG_SPARC_US3_CPUFREQ) += sparc-us3-cpufreq.o
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