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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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8b6f2499ac
ARM64 PSCI kernel interfaces that initialize idle states and implement the suspend API to enter them are generic and can be shared with the ARM architecture. To achieve that goal, this patch moves ARM64 PSCI idle management code to drivers/firmware, so that the interface to initialize and enter idle states can actually be shared by ARM and ARM64 arches back-ends. The ARM generic CPUidle implementation also requires the definition of a cpuidle_ops section entry for the kernel to initialize the CPUidle operations at boot based on the enable-method (ie ARM64 has the statically initialized cpu_ops counterparts for that purpose); therefore this patch also adds the required section entry on CONFIG_ARM for PSCI so that the kernel can initialize the PSCI CPUidle back-end when PSCI is the probed enable-method. On ARM64 this patch provides no functional change. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> [arch/arm64] Acked-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Jisheng Zhang <jszhang@marvell.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Sudeep Holla <sudeep.holla@arm.com> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Jisheng Zhang <jszhang@marvell.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Copyright (C) 2015 ARM Limited
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*/
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#ifndef __LINUX_PSCI_H
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#define __LINUX_PSCI_H
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#include <linux/init.h>
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#include <linux/types.h>
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#define PSCI_POWER_STATE_TYPE_STANDBY 0
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#define PSCI_POWER_STATE_TYPE_POWER_DOWN 1
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bool psci_tos_resident_on(int cpu);
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bool psci_power_state_loses_context(u32 state);
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bool psci_power_state_is_valid(u32 state);
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int psci_cpu_init_idle(unsigned int cpu);
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int psci_cpu_suspend_enter(unsigned long index);
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struct psci_operations {
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int (*cpu_suspend)(u32 state, unsigned long entry_point);
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int (*cpu_off)(u32 state);
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int (*cpu_on)(unsigned long cpuid, unsigned long entry_point);
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int (*migrate)(unsigned long cpuid);
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int (*affinity_info)(unsigned long target_affinity,
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unsigned long lowest_affinity_level);
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int (*migrate_info_type)(void);
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};
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extern struct psci_operations psci_ops;
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#if defined(CONFIG_ARM_PSCI_FW)
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int __init psci_dt_init(void);
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#else
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static inline int psci_dt_init(void) { return 0; }
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#endif
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#if defined(CONFIG_ARM_PSCI_FW) && defined(CONFIG_ACPI)
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int __init psci_acpi_init(void);
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bool __init acpi_psci_present(void);
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bool __init acpi_psci_use_hvc(void);
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#else
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static inline int psci_acpi_init(void) { return 0; }
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static inline bool acpi_psci_present(void) { return false; }
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#endif
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#endif /* __LINUX_PSCI_H */
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