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OpenCloudOS-Kernel/arch/arm64/kernel/psci.c

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arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Copyright (C) 2013 ARM Limited
*
* Author: Will Deacon <will.deacon@arm.com>
*/
#define pr_fmt(fmt) "psci: " fmt
#include <linux/init.h>
#include <linux/of.h>
arm64: unify smp_psci.c and psci.c The functions in psci.c are only used from smp_psci.c, and smp_psci cannot function without psci.c. Additionally psci.c is built when !SMP, where it's expected that cpu_suspend may be useful. This patch unifies the two files, removing pointless duplication and paving the way for PSCI support in UP systems. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:14 +08:00
#include <linux/smp.h>
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
#include <linux/reboot.h>
#include <linux/pm.h>
ARM: Check if a CPU has gone offline PSCIv0.2 adds a new function called AFFINITY_INFO, which can be used to query if a specified CPU has actually gone offline. Calling this function via cpu_kill ensures that a CPU has quiesced after a call to cpu_die. This helps prevent the CPU from doing arbitrary bad things when data or instructions are clobbered (as happens with kexec) in the window between a CPU announcing that it is dead and said CPU leaving the kernel. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-05-07 22:18:36 +08:00
#include <linux/delay.h>
arm64: add PSCI CPU_SUSPEND based cpu_suspend support This patch implements the cpu_suspend cpu operations method through the PSCI CPU SUSPEND API. The PSCI implementation translates the idle state index passed by the cpu_suspend core call into a valid PSCI state according to the PSCI states initialized at boot through the cpu_init_idle() CPU operations hook. The PSCI CPU suspend operation hook checks if the PSCI state is a standby state. If it is, it calls the PSCI suspend implementation straight away, without saving any context. If the state is a power down state the kernel calls the __cpu_suspend API (that saves the CPU context) and passed the PSCI suspend finisher as a parameter so that PSCI can be called by the __cpu_suspend implementation after saving and flushing the context as last function before power down. For power down states, entry point is set to cpu_resume physical address, that represents the default kernel execution address following a CPU reset. Reviewed-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-09-27 17:25:02 +08:00
#include <linux/slab.h>
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
#include <uapi/linux/psci.h>
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
#include <asm/compiler.h>
arm64: reorganise smp_enable_ops For hotplug support, we're going to want a place to store operations that do more than bring CPUs online, and it makes sense to group these with our current smp_enable_ops. For cpuidle support, we'll want to group additional functions, and we may want them even for UP kernels. This patch renames smp_enable_ops to the more general cpu_operations, and pulls the definitions out of smp code such that they can be used in UP kernels. While we're at it, fix up instances of the cpu parameter to be an unsigned int, drop the init markings and rename the *_cpu functions to cpu_* to reduce future churn when cpu_operations is extended. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:15 +08:00
#include <asm/cpu_ops.h>
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
#include <asm/errno.h>
#include <asm/psci.h>
arm64: unify smp_psci.c and psci.c The functions in psci.c are only used from smp_psci.c, and smp_psci cannot function without psci.c. Additionally psci.c is built when !SMP, where it's expected that cpu_suspend may be useful. This patch unifies the two files, removing pointless duplication and paving the way for PSCI support in UP systems. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:14 +08:00
#include <asm/smp_plat.h>
arm64: add PSCI CPU_SUSPEND based cpu_suspend support This patch implements the cpu_suspend cpu operations method through the PSCI CPU SUSPEND API. The PSCI implementation translates the idle state index passed by the cpu_suspend core call into a valid PSCI state according to the PSCI states initialized at boot through the cpu_init_idle() CPU operations hook. The PSCI CPU suspend operation hook checks if the PSCI state is a standby state. If it is, it calls the PSCI suspend implementation straight away, without saving any context. If the state is a power down state the kernel calls the __cpu_suspend API (that saves the CPU context) and passed the PSCI suspend finisher as a parameter so that PSCI can be called by the __cpu_suspend implementation after saving and flushing the context as last function before power down. For power down states, entry point is set to cpu_resume physical address, that represents the default kernel execution address following a CPU reset. Reviewed-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-09-27 17:25:02 +08:00
#include <asm/suspend.h>
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
#include <asm/system_misc.h>
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
arm64: unify smp_psci.c and psci.c The functions in psci.c are only used from smp_psci.c, and smp_psci cannot function without psci.c. Additionally psci.c is built when !SMP, where it's expected that cpu_suspend may be useful. This patch unifies the two files, removing pointless duplication and paving the way for PSCI support in UP systems. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:14 +08:00
#define PSCI_POWER_STATE_TYPE_STANDBY 0
#define PSCI_POWER_STATE_TYPE_POWER_DOWN 1
struct psci_power_state {
u16 id;
u8 type;
u8 affinity_level;
};
struct psci_operations {
int (*cpu_suspend)(struct psci_power_state state,
unsigned long entry_point);
int (*cpu_off)(struct psci_power_state state);
int (*cpu_on)(unsigned long cpuid, unsigned long entry_point);
int (*migrate)(unsigned long cpuid);
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
int (*affinity_info)(unsigned long target_affinity,
unsigned long lowest_affinity_level);
int (*migrate_info_type)(void);
arm64: unify smp_psci.c and psci.c The functions in psci.c are only used from smp_psci.c, and smp_psci cannot function without psci.c. Additionally psci.c is built when !SMP, where it's expected that cpu_suspend may be useful. This patch unifies the two files, removing pointless duplication and paving the way for PSCI support in UP systems. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:14 +08:00
};
static struct psci_operations psci_ops;
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
static int (*invoke_psci_fn)(u64, u64, u64, u64);
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
typedef int (*psci_initcall_t)(const struct device_node *);
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
enum psci_function {
PSCI_FN_CPU_SUSPEND,
PSCI_FN_CPU_ON,
PSCI_FN_CPU_OFF,
PSCI_FN_MIGRATE,
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
PSCI_FN_AFFINITY_INFO,
PSCI_FN_MIGRATE_INFO_TYPE,
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
PSCI_FN_MAX,
};
arm64: add PSCI CPU_SUSPEND based cpu_suspend support This patch implements the cpu_suspend cpu operations method through the PSCI CPU SUSPEND API. The PSCI implementation translates the idle state index passed by the cpu_suspend core call into a valid PSCI state according to the PSCI states initialized at boot through the cpu_init_idle() CPU operations hook. The PSCI CPU suspend operation hook checks if the PSCI state is a standby state. If it is, it calls the PSCI suspend implementation straight away, without saving any context. If the state is a power down state the kernel calls the __cpu_suspend API (that saves the CPU context) and passed the PSCI suspend finisher as a parameter so that PSCI can be called by the __cpu_suspend implementation after saving and flushing the context as last function before power down. For power down states, entry point is set to cpu_resume physical address, that represents the default kernel execution address following a CPU reset. Reviewed-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-09-27 17:25:02 +08:00
static DEFINE_PER_CPU_READ_MOSTLY(struct psci_power_state *, psci_power_state);
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
static u32 psci_function_id[PSCI_FN_MAX];
static int psci_to_linux_errno(int errno)
{
switch (errno) {
case PSCI_RET_SUCCESS:
return 0;
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
case PSCI_RET_NOT_SUPPORTED:
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
return -EOPNOTSUPP;
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
case PSCI_RET_INVALID_PARAMS:
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
return -EINVAL;
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
case PSCI_RET_DENIED:
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
return -EPERM;
};
return -EINVAL;
}
static u32 psci_power_state_pack(struct psci_power_state state)
{
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
return ((state.id << PSCI_0_2_POWER_STATE_ID_SHIFT)
& PSCI_0_2_POWER_STATE_ID_MASK) |
((state.type << PSCI_0_2_POWER_STATE_TYPE_SHIFT)
& PSCI_0_2_POWER_STATE_TYPE_MASK) |
((state.affinity_level << PSCI_0_2_POWER_STATE_AFFL_SHIFT)
& PSCI_0_2_POWER_STATE_AFFL_MASK);
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
}
arm64: add PSCI CPU_SUSPEND based cpu_suspend support This patch implements the cpu_suspend cpu operations method through the PSCI CPU SUSPEND API. The PSCI implementation translates the idle state index passed by the cpu_suspend core call into a valid PSCI state according to the PSCI states initialized at boot through the cpu_init_idle() CPU operations hook. The PSCI CPU suspend operation hook checks if the PSCI state is a standby state. If it is, it calls the PSCI suspend implementation straight away, without saving any context. If the state is a power down state the kernel calls the __cpu_suspend API (that saves the CPU context) and passed the PSCI suspend finisher as a parameter so that PSCI can be called by the __cpu_suspend implementation after saving and flushing the context as last function before power down. For power down states, entry point is set to cpu_resume physical address, that represents the default kernel execution address following a CPU reset. Reviewed-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-09-27 17:25:02 +08:00
static void psci_power_state_unpack(u32 power_state,
struct psci_power_state *state)
{
state->id = (power_state & PSCI_0_2_POWER_STATE_ID_MASK) >>
PSCI_0_2_POWER_STATE_ID_SHIFT;
state->type = (power_state & PSCI_0_2_POWER_STATE_TYPE_MASK) >>
PSCI_0_2_POWER_STATE_TYPE_SHIFT;
state->affinity_level =
(power_state & PSCI_0_2_POWER_STATE_AFFL_MASK) >>
PSCI_0_2_POWER_STATE_AFFL_SHIFT;
}
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
/*
* The following two functions are invoked via the invoke_psci_fn pointer
* and will not be inlined, allowing us to piggyback on the AAPCS.
*/
static noinline int __invoke_psci_fn_hvc(u64 function_id, u64 arg0, u64 arg1,
u64 arg2)
{
asm volatile(
__asmeq("%0", "x0")
__asmeq("%1", "x1")
__asmeq("%2", "x2")
__asmeq("%3", "x3")
"hvc #0\n"
: "+r" (function_id)
: "r" (arg0), "r" (arg1), "r" (arg2));
return function_id;
}
static noinline int __invoke_psci_fn_smc(u64 function_id, u64 arg0, u64 arg1,
u64 arg2)
{
asm volatile(
__asmeq("%0", "x0")
__asmeq("%1", "x1")
__asmeq("%2", "x2")
__asmeq("%3", "x3")
"smc #0\n"
: "+r" (function_id)
: "r" (arg0), "r" (arg1), "r" (arg2));
return function_id;
}
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
static int psci_get_version(void)
{
int err;
err = invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
return err;
}
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
static int psci_cpu_suspend(struct psci_power_state state,
unsigned long entry_point)
{
int err;
u32 fn, power_state;
fn = psci_function_id[PSCI_FN_CPU_SUSPEND];
power_state = psci_power_state_pack(state);
err = invoke_psci_fn(fn, power_state, entry_point, 0);
return psci_to_linux_errno(err);
}
static int psci_cpu_off(struct psci_power_state state)
{
int err;
u32 fn, power_state;
fn = psci_function_id[PSCI_FN_CPU_OFF];
power_state = psci_power_state_pack(state);
err = invoke_psci_fn(fn, power_state, 0, 0);
return psci_to_linux_errno(err);
}
static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point)
{
int err;
u32 fn;
fn = psci_function_id[PSCI_FN_CPU_ON];
err = invoke_psci_fn(fn, cpuid, entry_point, 0);
return psci_to_linux_errno(err);
}
static int psci_migrate(unsigned long cpuid)
{
int err;
u32 fn;
fn = psci_function_id[PSCI_FN_MIGRATE];
err = invoke_psci_fn(fn, cpuid, 0, 0);
return psci_to_linux_errno(err);
}
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
static int psci_affinity_info(unsigned long target_affinity,
unsigned long lowest_affinity_level)
{
int err;
u32 fn;
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
fn = psci_function_id[PSCI_FN_AFFINITY_INFO];
err = invoke_psci_fn(fn, target_affinity, lowest_affinity_level, 0);
return err;
}
static int psci_migrate_info_type(void)
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
{
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
int err;
u32 fn;
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
fn = psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE];
err = invoke_psci_fn(fn, 0, 0, 0);
return err;
}
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
arm64: add PSCI CPU_SUSPEND based cpu_suspend support This patch implements the cpu_suspend cpu operations method through the PSCI CPU SUSPEND API. The PSCI implementation translates the idle state index passed by the cpu_suspend core call into a valid PSCI state according to the PSCI states initialized at boot through the cpu_init_idle() CPU operations hook. The PSCI CPU suspend operation hook checks if the PSCI state is a standby state. If it is, it calls the PSCI suspend implementation straight away, without saving any context. If the state is a power down state the kernel calls the __cpu_suspend API (that saves the CPU context) and passed the PSCI suspend finisher as a parameter so that PSCI can be called by the __cpu_suspend implementation after saving and flushing the context as last function before power down. For power down states, entry point is set to cpu_resume physical address, that represents the default kernel execution address following a CPU reset. Reviewed-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-09-27 17:25:02 +08:00
static int __maybe_unused cpu_psci_cpu_init_idle(struct device_node *cpu_node,
unsigned int cpu)
{
int i, ret, count = 0;
struct psci_power_state *psci_states;
struct device_node *state_node;
/*
* If the PSCI cpu_suspend function hook has not been initialized
* idle states must not be enabled, so bail out
*/
if (!psci_ops.cpu_suspend)
return -EOPNOTSUPP;
/* Count idle states */
while ((state_node = of_parse_phandle(cpu_node, "cpu-idle-states",
count))) {
count++;
of_node_put(state_node);
}
if (!count)
return -ENODEV;
psci_states = kcalloc(count, sizeof(*psci_states), GFP_KERNEL);
if (!psci_states)
return -ENOMEM;
for (i = 0; i < count; i++) {
u32 psci_power_state;
state_node = of_parse_phandle(cpu_node, "cpu-idle-states", i);
ret = of_property_read_u32(state_node,
"arm,psci-suspend-param",
&psci_power_state);
if (ret) {
pr_warn(" * %s missing arm,psci-suspend-param property\n",
state_node->full_name);
of_node_put(state_node);
goto free_mem;
}
of_node_put(state_node);
pr_debug("psci-power-state %#x index %d\n", psci_power_state,
i);
psci_power_state_unpack(psci_power_state, &psci_states[i]);
}
/* Idle states parsed correctly, initialize per-cpu pointer */
per_cpu(psci_power_state, cpu) = psci_states;
return 0;
free_mem:
kfree(psci_states);
return ret;
}
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
static int get_set_conduit_method(struct device_node *np)
{
const char *method;
pr_info("probing for conduit method from DT.\n");
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
if (of_property_read_string(np, "method", &method)) {
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
pr_warn("missing \"method\" property\n");
return -ENXIO;
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
}
if (!strcmp("hvc", method)) {
invoke_psci_fn = __invoke_psci_fn_hvc;
} else if (!strcmp("smc", method)) {
invoke_psci_fn = __invoke_psci_fn_smc;
} else {
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
pr_warn("invalid \"method\" property: %s\n", method);
return -EINVAL;
}
return 0;
}
static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd)
{
invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
}
static void psci_sys_poweroff(void)
{
invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
}
/*
* PSCI Function IDs for v0.2+ are well defined so use
* standard values.
*/
arm64: kernel: add __init marker to PSCI init functions PSCI init functions must be marked as __init so that they are freed by the kernel upon boot. This patch marks the PSCI init functions as such since they need not be persistent in the kernel address space after the kernel has booted. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2014-07-18 01:19:19 +08:00
static int __init psci_0_2_init(struct device_node *np)
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
{
int err, ver;
err = get_set_conduit_method(np);
if (err)
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
goto out_put_node;
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
ver = psci_get_version();
if (ver == PSCI_RET_NOT_SUPPORTED) {
/* PSCI v0.2 mandates implementation of PSCI_ID_VERSION. */
pr_err("PSCI firmware does not comply with the v0.2 spec.\n");
err = -EOPNOTSUPP;
goto out_put_node;
} else {
pr_info("PSCIv%d.%d detected in firmware.\n",
PSCI_VERSION_MAJOR(ver),
PSCI_VERSION_MINOR(ver));
if (PSCI_VERSION_MAJOR(ver) == 0 &&
PSCI_VERSION_MINOR(ver) < 2) {
err = -EINVAL;
pr_err("Conflicting PSCI version detected.\n");
goto out_put_node;
}
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
}
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
pr_info("Using standard PSCI v0.2 function IDs\n");
psci_function_id[PSCI_FN_CPU_SUSPEND] = PSCI_0_2_FN64_CPU_SUSPEND;
psci_ops.cpu_suspend = psci_cpu_suspend;
psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF;
psci_ops.cpu_off = psci_cpu_off;
psci_function_id[PSCI_FN_CPU_ON] = PSCI_0_2_FN64_CPU_ON;
psci_ops.cpu_on = psci_cpu_on;
psci_function_id[PSCI_FN_MIGRATE] = PSCI_0_2_FN64_MIGRATE;
psci_ops.migrate = psci_migrate;
psci_function_id[PSCI_FN_AFFINITY_INFO] = PSCI_0_2_FN64_AFFINITY_INFO;
psci_ops.affinity_info = psci_affinity_info;
psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE] =
PSCI_0_2_FN_MIGRATE_INFO_TYPE;
psci_ops.migrate_info_type = psci_migrate_info_type;
arm_pm_restart = psci_sys_reset;
pm_power_off = psci_sys_poweroff;
out_put_node:
of_node_put(np);
return err;
}
/*
* PSCI < v0.2 get PSCI Function IDs via DT.
*/
arm64: kernel: add __init marker to PSCI init functions PSCI init functions must be marked as __init so that they are freed by the kernel upon boot. This patch marks the PSCI init functions as such since they need not be persistent in the kernel address space after the kernel has booted. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2014-07-18 01:19:19 +08:00
static int __init psci_0_1_init(struct device_node *np)
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
{
u32 id;
int err;
err = get_set_conduit_method(np);
if (err)
goto out_put_node;
pr_info("Using PSCI v0.1 Function IDs from DT\n");
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
if (!of_property_read_u32(np, "cpu_suspend", &id)) {
psci_function_id[PSCI_FN_CPU_SUSPEND] = id;
psci_ops.cpu_suspend = psci_cpu_suspend;
}
if (!of_property_read_u32(np, "cpu_off", &id)) {
psci_function_id[PSCI_FN_CPU_OFF] = id;
psci_ops.cpu_off = psci_cpu_off;
}
if (!of_property_read_u32(np, "cpu_on", &id)) {
psci_function_id[PSCI_FN_CPU_ON] = id;
psci_ops.cpu_on = psci_cpu_on;
}
if (!of_property_read_u32(np, "migrate", &id)) {
psci_function_id[PSCI_FN_MIGRATE] = id;
psci_ops.migrate = psci_migrate;
}
out_put_node:
of_node_put(np);
PSCI: Add initial support for PSCIv0.2 functions The PSCIv0.2 spec defines standard values of function IDs and introduces a few new functions. Detect version of PSCI and appropriately select the right PSCI functions. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-04-18 02:38:41 +08:00
return err;
}
static const struct of_device_id psci_of_match[] __initconst = {
{ .compatible = "arm,psci", .data = psci_0_1_init},
{ .compatible = "arm,psci-0.2", .data = psci_0_2_init},
{},
};
int __init psci_init(void)
{
struct device_node *np;
const struct of_device_id *matched_np;
psci_initcall_t init_fn;
np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
if (!np)
return -ENODEV;
init_fn = (psci_initcall_t)matched_np->data;
return init_fn(np);
arm64: psci: add support for PSCI invocations from the kernel This patch adds support for the Power State Coordination Interface defined by ARM, allowing Linux to request CPU-centric power-management operations from firmware implementing the PSCI protocol. Signed-off-by: Will Deacon <will.deacon@arm.com> [Marc: s/u32/u64/ in the relevant spots, and switch from an initcall to an simpler init function] Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2012-12-19 01:53:14 +08:00
}
arm64: unify smp_psci.c and psci.c The functions in psci.c are only used from smp_psci.c, and smp_psci cannot function without psci.c. Additionally psci.c is built when !SMP, where it's expected that cpu_suspend may be useful. This patch unifies the two files, removing pointless duplication and paving the way for PSCI support in UP systems. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:14 +08:00
#ifdef CONFIG_SMP
arm64: reorganise smp_enable_ops For hotplug support, we're going to want a place to store operations that do more than bring CPUs online, and it makes sense to group these with our current smp_enable_ops. For cpuidle support, we'll want to group additional functions, and we may want them even for UP kernels. This patch renames smp_enable_ops to the more general cpu_operations, and pulls the definitions out of smp code such that they can be used in UP kernels. While we're at it, fix up instances of the cpu parameter to be an unsigned int, drop the init markings and rename the *_cpu functions to cpu_* to reduce future churn when cpu_operations is extended. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:15 +08:00
static int __init cpu_psci_cpu_init(struct device_node *dn, unsigned int cpu)
arm64: unify smp_psci.c and psci.c The functions in psci.c are only used from smp_psci.c, and smp_psci cannot function without psci.c. Additionally psci.c is built when !SMP, where it's expected that cpu_suspend may be useful. This patch unifies the two files, removing pointless duplication and paving the way for PSCI support in UP systems. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:14 +08:00
{
return 0;
}
arm64: reorganise smp_enable_ops For hotplug support, we're going to want a place to store operations that do more than bring CPUs online, and it makes sense to group these with our current smp_enable_ops. For cpuidle support, we'll want to group additional functions, and we may want them even for UP kernels. This patch renames smp_enable_ops to the more general cpu_operations, and pulls the definitions out of smp code such that they can be used in UP kernels. While we're at it, fix up instances of the cpu parameter to be an unsigned int, drop the init markings and rename the *_cpu functions to cpu_* to reduce future churn when cpu_operations is extended. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:15 +08:00
static int __init cpu_psci_cpu_prepare(unsigned int cpu)
arm64: unify smp_psci.c and psci.c The functions in psci.c are only used from smp_psci.c, and smp_psci cannot function without psci.c. Additionally psci.c is built when !SMP, where it's expected that cpu_suspend may be useful. This patch unifies the two files, removing pointless duplication and paving the way for PSCI support in UP systems. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:14 +08:00
{
if (!psci_ops.cpu_on) {
pr_err("no cpu_on method, not booting CPU%d\n", cpu);
return -ENODEV;
}
return 0;
}
arm64: factor out spin-table boot method The arm64 kernel has an internal holding pen, which is necessary for some systems where we can't bring CPUs online individually and must hold multiple CPUs in a safe area until the kernel is able to handle them. The current SMP infrastructure for arm64 is closely coupled to this holding pen, and alternative boot methods must launch CPUs into the pen, where they sit before they are launched into the kernel proper. With PSCI (and possibly other future boot methods), we can bring CPUs online individually, and need not perform the secondary_holding_pen dance. Instead, this patch factors the holding pen management code out to the spin-table boot method code, as it is the only boot method requiring the pen. A new entry point for secondaries, secondary_entry is added for other boot methods to use, which bypasses the holding pen and its associated overhead when bringing CPUs online. The smp.pen.text section is also removed, as the pen can live in head.text without problem. The cpu_operations structure is extended with two new functions, cpu_boot and cpu_postboot, for bringing a cpu into the kernel and performing any post-boot cleanup required by a bootmethod (e.g. resetting the secondary_holding_pen_release to INVALID_HWID). Documentation is added for cpu_operations. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:16 +08:00
static int cpu_psci_cpu_boot(unsigned int cpu)
{
int err = psci_ops.cpu_on(cpu_logical_map(cpu), __pa(secondary_entry));
if (err)
arm64: remove redundant "psci:" prefixes Since 652af899799354049b273af897b798b8f03fdd88 "arm64: factor out spin-table boot method" psci prefix's been introduced. We have a common pr_fmt, so clean them up. Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2014-02-28 17:57:47 +08:00
pr_err("failed to boot CPU%d (%d)\n", cpu, err);
arm64: factor out spin-table boot method The arm64 kernel has an internal holding pen, which is necessary for some systems where we can't bring CPUs online individually and must hold multiple CPUs in a safe area until the kernel is able to handle them. The current SMP infrastructure for arm64 is closely coupled to this holding pen, and alternative boot methods must launch CPUs into the pen, where they sit before they are launched into the kernel proper. With PSCI (and possibly other future boot methods), we can bring CPUs online individually, and need not perform the secondary_holding_pen dance. Instead, this patch factors the holding pen management code out to the spin-table boot method code, as it is the only boot method requiring the pen. A new entry point for secondaries, secondary_entry is added for other boot methods to use, which bypasses the holding pen and its associated overhead when bringing CPUs online. The smp.pen.text section is also removed, as the pen can live in head.text without problem. The cpu_operations structure is extended with two new functions, cpu_boot and cpu_postboot, for bringing a cpu into the kernel and performing any post-boot cleanup required by a bootmethod (e.g. resetting the secondary_holding_pen_release to INVALID_HWID). Documentation is added for cpu_operations. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:16 +08:00
return err;
}
arm64: add PSCI CPU_OFF-based hotplug support This patch adds support for using PSCI CPU_OFF calls for CPU hotplug. With this code it is possible to hot unplug CPUs with "psci" as their boot-method, as long as there's an appropriate cpu_off function id specified in the psci node. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:19 +08:00
#ifdef CONFIG_HOTPLUG_CPU
static int cpu_psci_cpu_disable(unsigned int cpu)
{
/* Fail early if we don't have CPU_OFF support */
if (!psci_ops.cpu_off)
return -EOPNOTSUPP;
return 0;
}
static void cpu_psci_cpu_die(unsigned int cpu)
{
int ret;
/*
* There are no known implementations of PSCI actually using the
* power state field, pass a sensible default for now.
*/
struct psci_power_state state = {
.type = PSCI_POWER_STATE_TYPE_POWER_DOWN,
};
ret = psci_ops.cpu_off(state);
arm64: remove redundant "psci:" prefixes Since 652af899799354049b273af897b798b8f03fdd88 "arm64: factor out spin-table boot method" psci prefix's been introduced. We have a common pr_fmt, so clean them up. Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2014-02-28 17:57:47 +08:00
pr_crit("unable to power off CPU%u (%d)\n", cpu, ret);
arm64: add PSCI CPU_OFF-based hotplug support This patch adds support for using PSCI CPU_OFF calls for CPU hotplug. With this code it is possible to hot unplug CPUs with "psci" as their boot-method, as long as there's an appropriate cpu_off function id specified in the psci node. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:19 +08:00
}
ARM: Check if a CPU has gone offline PSCIv0.2 adds a new function called AFFINITY_INFO, which can be used to query if a specified CPU has actually gone offline. Calling this function via cpu_kill ensures that a CPU has quiesced after a call to cpu_die. This helps prevent the CPU from doing arbitrary bad things when data or instructions are clobbered (as happens with kexec) in the window between a CPU announcing that it is dead and said CPU leaving the kernel. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-05-07 22:18:36 +08:00
static int cpu_psci_cpu_kill(unsigned int cpu)
{
int err, i;
if (!psci_ops.affinity_info)
return 1;
/*
* cpu_kill could race with cpu_die and we can
* potentially end up declaring this cpu undead
* while it is dying. So, try again a few times.
*/
for (i = 0; i < 10; i++) {
err = psci_ops.affinity_info(cpu_logical_map(cpu), 0);
if (err == PSCI_0_2_AFFINITY_LEVEL_OFF) {
pr_info("CPU%d killed.\n", cpu);
return 1;
}
msleep(10);
pr_info("Retrying again to check for CPU kill\n");
}
pr_warn("CPU%d may not have shut down cleanly (AFFINITY_INFO reports %d)\n",
cpu, err);
/* Make op_cpu_kill() fail. */
return 0;
}
arm64: add PSCI CPU_OFF-based hotplug support This patch adds support for using PSCI CPU_OFF calls for CPU hotplug. With this code it is possible to hot unplug CPUs with "psci" as their boot-method, as long as there's an appropriate cpu_off function id specified in the psci node. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:19 +08:00
#endif
arm64: kernel: enable PSCI cpu operations on UP systems PSCI CPU operations have to be enabled on UP kernels so that calls like eg cpu_suspend can be made functional on UP too. This patch reworks the PSCI CPU operations so that they can be enabled on UP systems. Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2014-07-18 01:19:18 +08:00
#endif
arm64: add PSCI CPU_OFF-based hotplug support This patch adds support for using PSCI CPU_OFF calls for CPU hotplug. With this code it is possible to hot unplug CPUs with "psci" as their boot-method, as long as there's an appropriate cpu_off function id specified in the psci node. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:19 +08:00
arm64: add PSCI CPU_SUSPEND based cpu_suspend support This patch implements the cpu_suspend cpu operations method through the PSCI CPU SUSPEND API. The PSCI implementation translates the idle state index passed by the cpu_suspend core call into a valid PSCI state according to the PSCI states initialized at boot through the cpu_init_idle() CPU operations hook. The PSCI CPU suspend operation hook checks if the PSCI state is a standby state. If it is, it calls the PSCI suspend implementation straight away, without saving any context. If the state is a power down state the kernel calls the __cpu_suspend API (that saves the CPU context) and passed the PSCI suspend finisher as a parameter so that PSCI can be called by the __cpu_suspend implementation after saving and flushing the context as last function before power down. For power down states, entry point is set to cpu_resume physical address, that represents the default kernel execution address following a CPU reset. Reviewed-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-09-27 17:25:02 +08:00
static int psci_suspend_finisher(unsigned long index)
{
percpu: Convert remaining __get_cpu_var uses in 3.18-rcX During the 3.18 merge period additional __get_cpu_var uses were added. The patch converts these to this_cpu_ptr(). Signed-off-by: Christoph Lameter <cl@linux.com> Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Tejun Heo <tj@kernel.org>
2014-10-27 23:49:45 +08:00
struct psci_power_state *state = __this_cpu_read(psci_power_state);
arm64: add PSCI CPU_SUSPEND based cpu_suspend support This patch implements the cpu_suspend cpu operations method through the PSCI CPU SUSPEND API. The PSCI implementation translates the idle state index passed by the cpu_suspend core call into a valid PSCI state according to the PSCI states initialized at boot through the cpu_init_idle() CPU operations hook. The PSCI CPU suspend operation hook checks if the PSCI state is a standby state. If it is, it calls the PSCI suspend implementation straight away, without saving any context. If the state is a power down state the kernel calls the __cpu_suspend API (that saves the CPU context) and passed the PSCI suspend finisher as a parameter so that PSCI can be called by the __cpu_suspend implementation after saving and flushing the context as last function before power down. For power down states, entry point is set to cpu_resume physical address, that represents the default kernel execution address following a CPU reset. Reviewed-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-09-27 17:25:02 +08:00
return psci_ops.cpu_suspend(state[index - 1],
virt_to_phys(cpu_resume));
}
static int __maybe_unused cpu_psci_cpu_suspend(unsigned long index)
{
int ret;
percpu: Convert remaining __get_cpu_var uses in 3.18-rcX During the 3.18 merge period additional __get_cpu_var uses were added. The patch converts these to this_cpu_ptr(). Signed-off-by: Christoph Lameter <cl@linux.com> Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Tejun Heo <tj@kernel.org>
2014-10-27 23:49:45 +08:00
struct psci_power_state *state = __this_cpu_read(psci_power_state);
arm64: add PSCI CPU_SUSPEND based cpu_suspend support This patch implements the cpu_suspend cpu operations method through the PSCI CPU SUSPEND API. The PSCI implementation translates the idle state index passed by the cpu_suspend core call into a valid PSCI state according to the PSCI states initialized at boot through the cpu_init_idle() CPU operations hook. The PSCI CPU suspend operation hook checks if the PSCI state is a standby state. If it is, it calls the PSCI suspend implementation straight away, without saving any context. If the state is a power down state the kernel calls the __cpu_suspend API (that saves the CPU context) and passed the PSCI suspend finisher as a parameter so that PSCI can be called by the __cpu_suspend implementation after saving and flushing the context as last function before power down. For power down states, entry point is set to cpu_resume physical address, that represents the default kernel execution address following a CPU reset. Reviewed-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-09-27 17:25:02 +08:00
/*
* idle state index 0 corresponds to wfi, should never be called
* from the cpu_suspend operations
*/
if (WARN_ON_ONCE(!index))
return -EINVAL;
arm64: psci: fix cpu_suspend to check idle state type for index This fix rectifies the psci cpu_suspend implementation to check the PSCI power state parameter type field associated with the requested idle state index. Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Amit Daniel Kachhap <amit.daniel@samsung.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-10-30 20:24:51 +08:00
if (state[index - 1].type == PSCI_POWER_STATE_TYPE_STANDBY)
arm64: add PSCI CPU_SUSPEND based cpu_suspend support This patch implements the cpu_suspend cpu operations method through the PSCI CPU SUSPEND API. The PSCI implementation translates the idle state index passed by the cpu_suspend core call into a valid PSCI state according to the PSCI states initialized at boot through the cpu_init_idle() CPU operations hook. The PSCI CPU suspend operation hook checks if the PSCI state is a standby state. If it is, it calls the PSCI suspend implementation straight away, without saving any context. If the state is a power down state the kernel calls the __cpu_suspend API (that saves the CPU context) and passed the PSCI suspend finisher as a parameter so that PSCI can be called by the __cpu_suspend implementation after saving and flushing the context as last function before power down. For power down states, entry point is set to cpu_resume physical address, that represents the default kernel execution address following a CPU reset. Reviewed-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-09-27 17:25:02 +08:00
ret = psci_ops.cpu_suspend(state[index - 1], 0);
else
ret = __cpu_suspend(index, psci_suspend_finisher);
return ret;
}
arm64: reorganise smp_enable_ops For hotplug support, we're going to want a place to store operations that do more than bring CPUs online, and it makes sense to group these with our current smp_enable_ops. For cpuidle support, we'll want to group additional functions, and we may want them even for UP kernels. This patch renames smp_enable_ops to the more general cpu_operations, and pulls the definitions out of smp code such that they can be used in UP kernels. While we're at it, fix up instances of the cpu parameter to be an unsigned int, drop the init markings and rename the *_cpu functions to cpu_* to reduce future churn when cpu_operations is extended. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:15 +08:00
const struct cpu_operations cpu_psci_ops = {
arm64: unify smp_psci.c and psci.c The functions in psci.c are only used from smp_psci.c, and smp_psci cannot function without psci.c. Additionally psci.c is built when !SMP, where it's expected that cpu_suspend may be useful. This patch unifies the two files, removing pointless duplication and paving the way for PSCI support in UP systems. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:14 +08:00
.name = "psci",
arm64: add PSCI CPU_SUSPEND based cpu_suspend support This patch implements the cpu_suspend cpu operations method through the PSCI CPU SUSPEND API. The PSCI implementation translates the idle state index passed by the cpu_suspend core call into a valid PSCI state according to the PSCI states initialized at boot through the cpu_init_idle() CPU operations hook. The PSCI CPU suspend operation hook checks if the PSCI state is a standby state. If it is, it calls the PSCI suspend implementation straight away, without saving any context. If the state is a power down state the kernel calls the __cpu_suspend API (that saves the CPU context) and passed the PSCI suspend finisher as a parameter so that PSCI can be called by the __cpu_suspend implementation after saving and flushing the context as last function before power down. For power down states, entry point is set to cpu_resume physical address, that represents the default kernel execution address following a CPU reset. Reviewed-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-09-27 17:25:02 +08:00
#ifdef CONFIG_CPU_IDLE
.cpu_init_idle = cpu_psci_cpu_init_idle,
arm64: psci: Fix build breakage without PM_SLEEP Fix build failure of defconfig when PM_SLEEP is disabled (e.g. by disabling SUSPEND) and CPU_IDLE enabled: arch/arm64/kernel/psci.c:543:2: error: unknown field ‘cpu_suspend’ specified in initializer .cpu_suspend = cpu_psci_cpu_suspend, ^ arch/arm64/kernel/psci.c:543:2: warning: initialization from incompatible pointer type [enabled by default] arch/arm64/kernel/psci.c:543:2: warning: (near initialization for ‘cpu_psci_ops.cpu_prepare’) [enabled by default] make[1]: *** [arch/arm64/kernel/psci.o] Error 1 The cpu_operations.cpu_suspend field exists only if ARM64_CPU_SUSPEND is defined, not CPU_IDLE. Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-12-09 19:48:36 +08:00
#endif
#ifdef CONFIG_ARM64_CPU_SUSPEND
arm64: add PSCI CPU_SUSPEND based cpu_suspend support This patch implements the cpu_suspend cpu operations method through the PSCI CPU SUSPEND API. The PSCI implementation translates the idle state index passed by the cpu_suspend core call into a valid PSCI state according to the PSCI states initialized at boot through the cpu_init_idle() CPU operations hook. The PSCI CPU suspend operation hook checks if the PSCI state is a standby state. If it is, it calls the PSCI suspend implementation straight away, without saving any context. If the state is a power down state the kernel calls the __cpu_suspend API (that saves the CPU context) and passed the PSCI suspend finisher as a parameter so that PSCI can be called by the __cpu_suspend implementation after saving and flushing the context as last function before power down. For power down states, entry point is set to cpu_resume physical address, that represents the default kernel execution address following a CPU reset. Reviewed-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-09-27 17:25:02 +08:00
.cpu_suspend = cpu_psci_cpu_suspend,
#endif
arm64: kernel: enable PSCI cpu operations on UP systems PSCI CPU operations have to be enabled on UP kernels so that calls like eg cpu_suspend can be made functional on UP too. This patch reworks the PSCI CPU operations so that they can be enabled on UP systems. Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2014-07-18 01:19:18 +08:00
#ifdef CONFIG_SMP
arm64: reorganise smp_enable_ops For hotplug support, we're going to want a place to store operations that do more than bring CPUs online, and it makes sense to group these with our current smp_enable_ops. For cpuidle support, we'll want to group additional functions, and we may want them even for UP kernels. This patch renames smp_enable_ops to the more general cpu_operations, and pulls the definitions out of smp code such that they can be used in UP kernels. While we're at it, fix up instances of the cpu parameter to be an unsigned int, drop the init markings and rename the *_cpu functions to cpu_* to reduce future churn when cpu_operations is extended. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:15 +08:00
.cpu_init = cpu_psci_cpu_init,
.cpu_prepare = cpu_psci_cpu_prepare,
arm64: factor out spin-table boot method The arm64 kernel has an internal holding pen, which is necessary for some systems where we can't bring CPUs online individually and must hold multiple CPUs in a safe area until the kernel is able to handle them. The current SMP infrastructure for arm64 is closely coupled to this holding pen, and alternative boot methods must launch CPUs into the pen, where they sit before they are launched into the kernel proper. With PSCI (and possibly other future boot methods), we can bring CPUs online individually, and need not perform the secondary_holding_pen dance. Instead, this patch factors the holding pen management code out to the spin-table boot method code, as it is the only boot method requiring the pen. A new entry point for secondaries, secondary_entry is added for other boot methods to use, which bypasses the holding pen and its associated overhead when bringing CPUs online. The smp.pen.text section is also removed, as the pen can live in head.text without problem. The cpu_operations structure is extended with two new functions, cpu_boot and cpu_postboot, for bringing a cpu into the kernel and performing any post-boot cleanup required by a bootmethod (e.g. resetting the secondary_holding_pen_release to INVALID_HWID). Documentation is added for cpu_operations. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:16 +08:00
.cpu_boot = cpu_psci_cpu_boot,
arm64: add PSCI CPU_OFF-based hotplug support This patch adds support for using PSCI CPU_OFF calls for CPU hotplug. With this code it is possible to hot unplug CPUs with "psci" as their boot-method, as long as there's an appropriate cpu_off function id specified in the psci node. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:19 +08:00
#ifdef CONFIG_HOTPLUG_CPU
.cpu_disable = cpu_psci_cpu_disable,
.cpu_die = cpu_psci_cpu_die,
ARM: Check if a CPU has gone offline PSCIv0.2 adds a new function called AFFINITY_INFO, which can be used to query if a specified CPU has actually gone offline. Calling this function via cpu_kill ensures that a CPU has quiesced after a call to cpu_die. This helps prevent the CPU from doing arbitrary bad things when data or instructions are clobbered (as happens with kexec) in the window between a CPU announcing that it is dead and said CPU leaving the kernel. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2014-05-07 22:18:36 +08:00
.cpu_kill = cpu_psci_cpu_kill,
arm64: add PSCI CPU_OFF-based hotplug support This patch adds support for using PSCI CPU_OFF calls for CPU hotplug. With this code it is possible to hot unplug CPUs with "psci" as their boot-method, as long as there's an appropriate cpu_off function id specified in the psci node. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:19 +08:00
#endif
arm64: kernel: enable PSCI cpu operations on UP systems PSCI CPU operations have to be enabled on UP kernels so that calls like eg cpu_suspend can be made functional on UP too. This patch reworks the PSCI CPU operations so that they can be enabled on UP systems. Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2014-07-18 01:19:18 +08:00
#endif
arm64: unify smp_psci.c and psci.c The functions in psci.c are only used from smp_psci.c, and smp_psci cannot function without psci.c. Additionally psci.c is built when !SMP, where it's expected that cpu_suspend may be useful. This patch unifies the two files, removing pointless duplication and paving the way for PSCI support in UP systems. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-10-25 03:30:14 +08:00
};