Merge branch 'aarch64/psci/drivers' into aarch64/for-next/core (d422e625) · Commits · EulixOS / Software / Kernel

MAINTAINERS

+9 −0

Original line number	Diff line number	Diff line
		@@ -8071,6 +8071,15 @@ S: Maintained
		F: include/linux/power_supply.h
		F: drivers/power/

		POWER STATE COORDINATION INTERFACE (PSCI)
		M: Mark Rutland <mark.rutland@arm.com>
		M: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
		L: linux-arm-kernel@lists.infradead.org
		S: Maintained
		F: drivers/firmware/psci.c
		F: include/linux/psci.h
		F: include/uapi/linux/psci.h

		PNP SUPPORT
		M: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
		S: Maintained

arch/arm64/Kconfig

+1 −0

Original line number	Diff line number	Diff line
		@@ -20,6 +20,7 @@ config ARM64
		select ARM_GIC_V2M if PCI_MSI
		select ARM_GIC_V3
		select ARM_GIC_V3_ITS if PCI_MSI
		select ARM_PSCI_FW
		select BUILDTIME_EXTABLE_SORT
		select CLONE_BACKWARDS
		select COMMON_CLK

arch/arm64/include/asm/acpi.h

+2 −2

Original line number	Diff line number	Diff line
		@@ -12,11 +12,11 @@
		#ifndef _ASM_ACPI_H
		#define _ASM_ACPI_H

		#include <linux/mm.h>
		#include <linux/irqchip/arm-gic-acpi.h>
		#include <linux/mm.h>
		#include <linux/psci.h>

		#include <asm/cputype.h>
		#include <asm/psci.h>
		#include <asm/smp_plat.h>

		/* Macros for consistency checks of the GICC subtable of MADT */

arch/arm64/kernel/psci.c

+2 −359

Original line number	Diff line number	Diff line
		@@ -18,23 +18,17 @@
		#include <linux/init.h>
		#include <linux/of.h>
		#include <linux/smp.h>
		#include <linux/reboot.h>
		#include <linux/pm.h>
		#include <linux/delay.h>
		#include <linux/psci.h>
		#include <linux/slab.h>

		#include <uapi/linux/psci.h>

		#include <asm/compiler.h>
		#include <asm/cputype.h>
		#include <asm/cpu_ops.h>
		#include <asm/errno.h>
		#include <asm/psci.h>
		#include <asm/smp_plat.h>
		#include <asm/suspend.h>
		#include <asm/system_misc.h>

		#define PSCI_POWER_STATE_TYPE_STANDBY 0
		#define PSCI_POWER_STATE_TYPE_POWER_DOWN 1

		static bool psci_power_state_loses_context(u32 state)
		{
		@@ -50,122 +44,8 @@ static bool psci_power_state_is_valid(u32 state)
		return !(state & ~valid_mask);
		}

		/*
		* The CPU any Trusted OS is resident on. The trusted OS may reject CPU_OFF
		* calls to its resident CPU, so we must avoid issuing those. We never migrate
		* a Trusted OS even if it claims to be capable of migration -- doing so will
		* require cooperation with a Trusted OS driver.
		*/
		static int resident_cpu = -1;

		struct psci_operations {
		int (*cpu_suspend)(u32 state, unsigned long entry_point);
		int (*cpu_off)(u32 state);
		int (*cpu_on)(unsigned long cpuid, unsigned long entry_point);
		int (*migrate)(unsigned long cpuid);
		int (*affinity_info)(unsigned long target_affinity,
		unsigned long lowest_affinity_level);
		int (*migrate_info_type)(void);
		};

		static struct psci_operations psci_ops;

		typedef unsigned long (psci_fn)(unsigned long, unsigned long,
		unsigned long, unsigned long);
		asmlinkage psci_fn __invoke_psci_fn_hvc;
		asmlinkage psci_fn __invoke_psci_fn_smc;
		static psci_fn *invoke_psci_fn;

		enum psci_function {
		PSCI_FN_CPU_SUSPEND,
		PSCI_FN_CPU_ON,
		PSCI_FN_CPU_OFF,
		PSCI_FN_MIGRATE,
		PSCI_FN_MAX,
		};

		static DEFINE_PER_CPU_READ_MOSTLY(u32 *, psci_power_state);

		static u32 psci_function_id[PSCI_FN_MAX];

		static int psci_to_linux_errno(int errno)
		{
		switch (errno) {
		case PSCI_RET_SUCCESS:
		return 0;
		case PSCI_RET_NOT_SUPPORTED:
		return -EOPNOTSUPP;
		case PSCI_RET_INVALID_PARAMS:
		return -EINVAL;
		case PSCI_RET_DENIED:
		return -EPERM;
		};

		return -EINVAL;
		}

		static u32 psci_get_version(void)
		{
		return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
		}

		static int psci_cpu_suspend(u32 state, unsigned long entry_point)
		{
		int err;
		u32 fn;

		fn = psci_function_id[PSCI_FN_CPU_SUSPEND];
		err = invoke_psci_fn(fn, state, entry_point, 0);
		return psci_to_linux_errno(err);
		}

		static int psci_cpu_off(u32 state)
		{
		int err;
		u32 fn;

		fn = psci_function_id[PSCI_FN_CPU_OFF];
		err = invoke_psci_fn(fn, 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);
		}

		static int psci_affinity_info(unsigned long target_affinity,
		unsigned long lowest_affinity_level)
		{
		return invoke_psci_fn(PSCI_0_2_FN64_AFFINITY_INFO, target_affinity,
		lowest_affinity_level, 0);
		}

		static int psci_migrate_info_type(void)
		{
		return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0);
		}

		static unsigned long psci_migrate_info_up_cpu(void)
		{
		return invoke_psci_fn(PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU, 0, 0, 0);
		}

		static int __maybe_unused cpu_psci_cpu_init_idle(unsigned int cpu)
		{
		int i, ret, count = 0;
		@@ -230,238 +110,6 @@ static int __maybe_unused cpu_psci_cpu_init_idle(unsigned int cpu)
		return ret;
		}

		static int get_set_conduit_method(struct device_node *np)
		{
		const char *method;

		pr_info("probing for conduit method from DT.\n");

		if (of_property_read_string(np, "method", &method)) {
		pr_warn("missing \"method\" property\n");
		return -ENXIO;
		}

		if (!strcmp("hvc", method)) {
		invoke_psci_fn = __invoke_psci_fn_hvc;
		} else if (!strcmp("smc", method)) {
		invoke_psci_fn = __invoke_psci_fn_smc;
		} else {
		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);
		}

		/*
		* Detect the presence of a resident Trusted OS which may cause CPU_OFF to
		* return DENIED (which would be fatal).
		*/
		static void __init psci_init_migrate(void)
		{
		unsigned long cpuid;
		int type, cpu;

		type = psci_ops.migrate_info_type();

		if (type == PSCI_0_2_TOS_MP) {
		pr_info("Trusted OS migration not required\n");
		return;
		}

		if (type == PSCI_RET_NOT_SUPPORTED) {
		pr_info("MIGRATE_INFO_TYPE not supported.\n");
		return;
		}

		if (type != PSCI_0_2_TOS_UP_MIGRATE &&
		type != PSCI_0_2_TOS_UP_NO_MIGRATE) {
		pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);
		return;
		}

		cpuid = psci_migrate_info_up_cpu();
		if (cpuid & ~MPIDR_HWID_BITMASK) {
		pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n",
		cpuid);
		return;
		}

		cpu = get_logical_index(cpuid);
		resident_cpu = cpu >= 0 ? cpu : -1;

		pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid);
		}

		static void __init psci_0_2_set_functions(void)
		{
		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_ops.affinity_info = psci_affinity_info;

		psci_ops.migrate_info_type = psci_migrate_info_type;

		arm_pm_restart = psci_sys_reset;

		pm_power_off = psci_sys_poweroff;
		}

		/*
		* Probe function for PSCI firmware versions >= 0.2
		*/
		static int __init psci_probe(void)
		{
		u32 ver = psci_get_version();

		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) {
		pr_err("Conflicting PSCI version detected.\n");
		return -EINVAL;
		}

		psci_0_2_set_functions();

		psci_init_migrate();

		return 0;
		}

		typedef int (psci_initcall_t)(const struct device_node );

		/*
		* PSCI init function for PSCI versions >=0.2
		*
		* Probe based on PSCI PSCI_VERSION function
		*/
		static int __init psci_0_2_init(struct device_node *np)
		{
		int err;

		err = get_set_conduit_method(np);

		if (err)
		goto out_put_node;
		/*
		* Starting with v0.2, the PSCI specification introduced a call
		* (PSCI_VERSION) that allows probing the firmware version, so
		* that PSCI function IDs and version specific initialization
		* can be carried out according to the specific version reported
		* by firmware
		*/
		err = psci_probe();

		out_put_node:
		of_node_put(np);
		return err;
		}

		/*
		* PSCI < v0.2 get PSCI Function IDs via DT.
		*/
		static int __init psci_0_1_init(struct device_node *np)
		{
		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");

		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);
		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_dt_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);
		}

		#ifdef CONFIG_ACPI
		/*
		* We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
		* explicitly clarified in SBBR
		*/
		int __init psci_acpi_init(void)
		{
		if (!acpi_psci_present()) {
		pr_info("is not implemented in ACPI.\n");
		return -EOPNOTSUPP;
		}

		pr_info("probing for conduit method from ACPI.\n");

		if (acpi_psci_use_hvc())
		invoke_psci_fn = __invoke_psci_fn_hvc;
		else
		invoke_psci_fn = __invoke_psci_fn_smc;

		return psci_probe();
		}
		#endif

		static int __init cpu_psci_cpu_init(unsigned int cpu)
		{
		return 0;
		@@ -487,11 +135,6 @@ static int cpu_psci_cpu_boot(unsigned int cpu)
		}

		#ifdef CONFIG_HOTPLUG_CPU
		static bool psci_tos_resident_on(int cpu)
		{
		return cpu == resident_cpu;
		}

		static int cpu_psci_cpu_disable(unsigned int cpu)
		{
		/* Fail early if we don't have CPU_OFF support */

arch/arm64/kernel/setup.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -46,6 +46,7 @@
		#include <linux/of_platform.h>
		#include <linux/efi.h>
		#include <linux/personality.h>
		#include <linux/psci.h>

		#include <asm/acpi.h>
		#include <asm/fixmap.h>
		@@ -61,7 +62,6 @@
		#include <asm/tlbflush.h>
		#include <asm/traps.h>
		#include <asm/memblock.h>
		#include <asm/psci.h>
		#include <asm/efi.h>
		#include <asm/xen/hypervisor.h>