Merge branch 'psci/for-rmk' of...

Merge branch 'psci/for-rmk' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux into devel-stable

MAINTAINERS

@@ -8066,6 +8066,15 @@ 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/arm/Kconfig

@@ -1496,6 +1496,7 @@ config HOTPLUG_CPU
 config ARM_PSCI
 	bool "Support for the ARM Power State Coordination Interface (PSCI)"
 	depends on CPU_V7
+	select ARM_PSCI_FW
 	help
 	  Say Y here if you want Linux to communicate with system firmware
 	  implementing the PSCI specification for CPU-centric power

arch/arm/include/asm/psci.h

@@ -14,34 +14,11 @@
 #ifndef __ASM_ARM_PSCI_H
 #define __ASM_ARM_PSCI_H
 
-#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);
-	int (*affinity_info)(unsigned long target_affinity,
-			unsigned long lowest_affinity_level);
-	int (*migrate_info_type)(void);
-};
-
-extern struct psci_operations psci_ops;
 extern struct smp_operations psci_smp_ops;
 
 #ifdef CONFIG_ARM_PSCI
-int psci_init(void);
 bool psci_smp_available(void);
 #else
-static inline int psci_init(void) { return 0; }
 static inline bool psci_smp_available(void) { return false; }
 #endif
 

arch/arm/kernel/Makefile

@@ -88,7 +88,7 @@ obj-$(CONFIG_EARLY_PRINTK)	+= early_printk.o
 
 obj-$(CONFIG_ARM_VIRT_EXT)	+= hyp-stub.o
 ifeq ($(CONFIG_ARM_PSCI),y)
-obj-y				+= psci.o psci-call.o
+obj-y				+= psci-call.o
 obj-$(CONFIG_SMP)		+= psci_smp.o
 endif
 

arch/arm/kernel/psci_smp.c

@@ -17,6 +17,8 @@
 #include <linux/smp.h>
 #include <linux/of.h>
 #include <linux/delay.h>
+#include <linux/psci.h>
+
 #include <uapi/linux/psci.h>
 
 #include <asm/psci.h>
@@ -51,22 +53,34 @@ static int psci_boot_secondary(unsigned int cpu, struct task_struct *idle)
 {
 	if (psci_ops.cpu_on)
 		return psci_ops.cpu_on(cpu_logical_map(cpu),
-				       __pa(secondary_startup));
+					virt_to_idmap(&secondary_startup));
 	return -ENODEV;
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
+int psci_cpu_disable(unsigned int cpu)
+{
+	/* Fail early if we don't have CPU_OFF support */
+	if (!psci_ops.cpu_off)
+		return -EOPNOTSUPP;
+
+	/* Trusted OS will deny CPU_OFF */
+	if (psci_tos_resident_on(cpu))
+		return -EPERM;
+
+	return 0;
+}
+
 void __ref psci_cpu_die(unsigned int cpu)
 {
-       const struct psci_power_state ps = {
-               .type = PSCI_POWER_STATE_TYPE_POWER_DOWN,
-       };
+	u32 state = PSCI_POWER_STATE_TYPE_POWER_DOWN <<
+		    PSCI_0_2_POWER_STATE_TYPE_SHIFT;
 
-       if (psci_ops.cpu_off)
-               psci_ops.cpu_off(ps);
+	if (psci_ops.cpu_off)
+		psci_ops.cpu_off(state);
 
-       /* We should never return */
-       panic("psci: cpu %d failed to shutdown\n", cpu);
+	/* We should never return */
+	panic("psci: cpu %d failed to shutdown\n", cpu);
 }
 
 int __ref psci_cpu_kill(unsigned int cpu)
@@ -109,6 +123,7 @@ bool __init psci_smp_available(void)
 struct smp_operations __initdata psci_smp_ops = {
 	.smp_boot_secondary	= psci_boot_secondary,
 #ifdef CONFIG_HOTPLUG_CPU
+	.cpu_disable		= psci_cpu_disable,
 	.cpu_die		= psci_cpu_die,
 	.cpu_kill		= psci_cpu_kill,
 #endif

arch/arm/kernel/setup.c

@@ -31,6 +31,7 @@
 #include <linux/bug.h>
 #include <linux/compiler.h>
 #include <linux/sort.h>
+#include <linux/psci.h>
 
 #include <asm/unified.h>
 #include <asm/cp15.h>
@@ -972,7 +973,7 @@ void __init setup_arch(char **cmdline_p)
 	unflatten_device_tree();
 
 	arm_dt_init_cpu_maps();
-	psci_init();
+	psci_dt_init();
 	xen_early_init();
 #ifdef CONFIG_SMP
 	if (is_smp()) {

arch/arm/mach-highbank/highbank.c

@@ -28,8 +28,8 @@
 #include <linux/reboot.h>
 #include <linux/amba/bus.h>
 #include <linux/platform_device.h>
+#include <linux/psci.h>
 
-#include <asm/psci.h>
 #include <asm/hardware/cache-l2x0.h>
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>

arch/arm/mach-highbank/pm.c

@@ -16,19 +16,21 @@
 
 #include <linux/cpu_pm.h>
 #include <linux/init.h>
+#include <linux/psci.h>
 #include <linux/suspend.h>
 
 #include <asm/suspend.h>
-#include <asm/psci.h>
+
+#include <uapi/linux/psci.h>
+
+#define HIGHBANK_SUSPEND_PARAM \
+	((0 << PSCI_0_2_POWER_STATE_ID_SHIFT) | \
+	 (1 << PSCI_0_2_POWER_STATE_AFFL_SHIFT) | \
+	 (PSCI_POWER_STATE_TYPE_POWER_DOWN << PSCI_0_2_POWER_STATE_TYPE_SHIFT))
 
 static int highbank_suspend_finish(unsigned long val)
 {
-	const struct psci_power_state ps = {
-		.type = PSCI_POWER_STATE_TYPE_POWER_DOWN,
-		.affinity_level = 1,
-	};
-
-	return psci_ops.cpu_suspend(ps, __pa(cpu_resume));
+	return psci_ops.cpu_suspend(HIGHBANK_SUSPEND_PARAM, __pa(cpu_resume));
 }
 
 static int highbank_pm_enter(suspend_state_t state)

arch/arm64/Kconfig

@@ -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

@@ -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

@@ -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
-
 #ifdef CONFIG_SMP
 
 static int __init cpu_psci_cpu_init(unsigned int cpu)
@@ -489,11 +137,6 @@ 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

@@ -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/virt.h>
 #include <asm/xen/hypervisor.h>

drivers/cpuidle/cpuidle-calxeda.c

@@ -25,16 +25,21 @@
 #include <linux/init.h>
 #include <linux/mm.h>
 #include <linux/platform_device.h>
+#include <linux/psci.h>
+
 #include <asm/cpuidle.h>
 #include <asm/suspend.h>
-#include <asm/psci.h>
+
+#include <uapi/linux/psci.h>
+
+#define CALXEDA_IDLE_PARAM \
+	((0 << PSCI_0_2_POWER_STATE_ID_SHIFT) | \
+	 (0 << PSCI_0_2_POWER_STATE_AFFL_SHIFT) | \
+	 (PSCI_POWER_STATE_TYPE_POWER_DOWN << PSCI_0_2_POWER_STATE_TYPE_SHIFT))
 
 static int calxeda_idle_finish(unsigned long val)
 {
-	const struct psci_power_state ps = {
-		.type = PSCI_POWER_STATE_TYPE_POWER_DOWN,
-	};
-	return psci_ops.cpu_suspend(ps, __pa(cpu_resume));
+	return psci_ops.cpu_suspend(CALXEDA_IDLE_PARAM, __pa(cpu_resume));
 }
 
 static int calxeda_pwrdown_idle(struct cpuidle_device *dev,

drivers/firmware/Kconfig

@@ -5,6 +5,9 @@
 
 menu "Firmware Drivers"
 
+config ARM_PSCI_FW
+	bool
+
 config EDD
 	tristate "BIOS Enhanced Disk Drive calls determine boot disk"
 	depends on X86

drivers/firmware/Makefile

 #
 # Makefile for the linux kernel.
 #
+obj-$(CONFIG_ARM_PSCI_FW)	+= psci.o
 obj-$(CONFIG_DMI)		+= dmi_scan.o
 obj-$(CONFIG_DMI_SYSFS)		+= dmi-sysfs.o
 obj-$(CONFIG_EDD)		+= edd.o

arch/arm/kernel/psci.c → drivers/firmware/psci.c

@@ -8,39 +8,63 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
- * Copyright (C) 2012 ARM Limited
- *
- * Author: Will Deacon <will.deacon@arm.com>
+ * Copyright (C) 2015 ARM Limited
  */
 
 #define pr_fmt(fmt) "psci: " fmt
 
-#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/linkage.h>
 #include <linux/of.h>
-#include <linux/reboot.h>
 #include <linux/pm.h>
+#include <linux/printk.h>
+#include <linux/psci.h>
+#include <linux/reboot.h>
+
 #include <uapi/linux/psci.h>
 
-#include <asm/compiler.h>
-#include <asm/errno.h>
-#include <asm/psci.h>
+#include <asm/cputype.h>
 #include <asm/system_misc.h>
+#include <asm/smp_plat.h>
 
-struct psci_operations psci_ops;
+/*
+ * While a 64-bit OS can make calls with SMC32 calling conventions, for some
+ * calls it is necessary to use SMC64 to pass or return 64-bit values. For such
+ * calls PSCI_0_2_FN_NATIVE(x) will choose the appropriate (native-width)
+ * function ID.
+ */
+#ifdef CONFIG_64BIT
+#define PSCI_0_2_FN_NATIVE(name)	PSCI_0_2_FN64_##name
+#else
+#define PSCI_0_2_FN_NATIVE(name)	PSCI_0_2_FN_##name
+#endif
 
-static int (*invoke_psci_fn)(u32, u32, u32, u32);
-typedef int (*psci_initcall_t)(const struct device_node *);
+/*
+ * 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;
+
+bool psci_tos_resident_on(int cpu)
+{
+	return cpu == resident_cpu;
+}
+
+struct psci_operations psci_ops;
 
-asmlinkage int __invoke_psci_fn_hvc(u32, u32, u32, u32);
-asmlinkage int __invoke_psci_fn_smc(u32, u32, u32, u32);
+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_AFFINITY_INFO,
-	PSCI_FN_MIGRATE_INFO_TYPE,
 	PSCI_FN_MAX,
 };
 
@@ -62,44 +86,28 @@ static int psci_to_linux_errno(int errno)
 	return -EINVAL;
 }
 
-static u32 psci_power_state_pack(struct psci_power_state state)
+static u32 psci_get_version(void)
 {
-	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);
+	return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
 }
 
-static int psci_get_version(void)
+static int psci_cpu_suspend(u32 state, unsigned long entry_point)
 {
 	int err;
-
-	err = invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
-	return err;
-}
-
-static int psci_cpu_suspend(struct psci_power_state state,
-			    unsigned long entry_point)
-{
-	int err;
-	u32 fn, power_state;
+	u32 fn;
 
 	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);
+	err = invoke_psci_fn(fn, state, entry_point, 0);
 	return psci_to_linux_errno(err);
 }
 
-static int psci_cpu_off(struct psci_power_state state)
+static int psci_cpu_off(u32 state)
 {
 	int err;
-	u32 fn, power_state;
+	u32 fn;
 
 	fn = psci_function_id[PSCI_FN_CPU_OFF];
-	power_state = psci_power_state_pack(state);
-	err = invoke_psci_fn(fn, power_state, 0, 0);
+	err = invoke_psci_fn(fn, state, 0, 0);
 	return psci_to_linux_errno(err);
 }
 
@@ -126,22 +134,19 @@ static int psci_migrate(unsigned long cpuid)
 static int psci_affinity_info(unsigned long target_affinity,
 		unsigned long lowest_affinity_level)
 {
-	int err;
-	u32 fn;
-
-	fn = psci_function_id[PSCI_FN_AFFINITY_INFO];
-	err = invoke_psci_fn(fn, target_affinity, lowest_affinity_level, 0);
-	return err;
+	return invoke_psci_fn(PSCI_0_2_FN_NATIVE(AFFINITY_INFO),
+			      target_affinity, lowest_affinity_level, 0);
 }
 
 static int psci_migrate_info_type(void)
 {
-	int err;
-	u32 fn;
+	return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0);
+}
 
-	fn = psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE];
-	err = invoke_psci_fn(fn, 0, 0, 0);
-	return err;
+static unsigned long psci_migrate_info_up_cpu(void)
+{
+	return invoke_psci_fn(PSCI_0_2_FN_NATIVE(MIGRATE_INFO_UP_CPU),
+			      0, 0, 0);
 }
 
 static int get_set_conduit_method(struct device_node *np)
@@ -177,61 +182,115 @@ static void psci_sys_poweroff(void)
 }
 
 /*
- * PSCI Function IDs for v0.2+ are well defined so use
- * standard values.
+ * Detect the presence of a resident Trusted OS which may cause CPU_OFF to
+ * return DENIED (which would be fatal).
  */
-static int psci_0_2_init(struct device_node *np)
+static void __init psci_init_migrate(void)
 {
-	int err, ver;
+	unsigned long cpuid;
+	int type, cpu = -1;
 
-	err = get_set_conduit_method(np);
+	type = psci_ops.migrate_info_type();
 
-	if (err)
-		goto out_put_node;
+	if (type == PSCI_0_2_TOS_MP) {
+		pr_info("Trusted OS migration not required\n");
+		return;
+	}
 
-	ver = psci_get_version();
+	if (type == PSCI_RET_NOT_SUPPORTED) {
+		pr_info("MIGRATE_INFO_TYPE not supported.\n");
+		return;
+	}
 
-	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;
-		}
+	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_FN_CPU_SUSPEND;
+	psci_function_id[PSCI_FN_CPU_SUSPEND] = PSCI_0_2_FN_NATIVE(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_FN_CPU_ON;
+	psci_function_id[PSCI_FN_CPU_ON] = PSCI_0_2_FN_NATIVE(CPU_ON);
 	psci_ops.cpu_on = psci_cpu_on;
 
-	psci_function_id[PSCI_FN_MIGRATE] = PSCI_0_2_FN_MIGRATE;
+	psci_function_id[PSCI_FN_MIGRATE] = PSCI_0_2_FN_NATIVE(MIGRATE);
 	psci_ops.migrate = psci_migrate;
 
-	psci_function_id[PSCI_FN_AFFINITY_INFO] = PSCI_0_2_FN_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;
+}
+
+/*
+ * 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);
@@ -241,7 +300,7 @@ static int psci_0_2_init(struct device_node *np)
 /*
  * PSCI < v0.2 get PSCI Function IDs via DT.
  */
-static int psci_0_1_init(struct device_node *np)
+static int __init psci_0_1_init(struct device_node *np)
 {
 	u32 id;
 	int err;
@@ -279,21 +338,45 @@ static int psci_0_1_init(struct device_node *np)
 }
 
 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},
+	{ .compatible = "arm,psci",	.data = psci_0_1_init},
+	{ .compatible = "arm,psci-0.2",	.data = psci_0_2_init},
 	{},
 };
 
-int __init psci_init(void)
+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

arch/arm64/include/asm/psci.h → include/linux/psci.h

@@ -8,15 +8,39 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
- * Copyright (C) 2013 ARM Limited
+ * Copyright (C) 2015 ARM Limited
  */
 
-#ifndef __ASM_PSCI_H
-#define __ASM_PSCI_H
+#ifndef __LINUX_PSCI_H
+#define __LINUX_PSCI_H
 
+#include <linux/init.h>
+#include <linux/types.h>
+
+#define PSCI_POWER_STATE_TYPE_STANDBY		0
+#define PSCI_POWER_STATE_TYPE_POWER_DOWN	1
+
+bool psci_tos_resident_on(int cpu);
+
+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);
+};
+
+extern struct psci_operations psci_ops;
+
+#if defined(CONFIG_ARM_PSCI_FW)
 int __init psci_dt_init(void);
+#else
+static inline int psci_dt_init(void) { return 0; }
+#endif
 
-#ifdef CONFIG_ACPI
+#if defined(CONFIG_ARM_PSCI_FW) && defined(CONFIG_ACPI)
 int __init psci_acpi_init(void);
 bool __init acpi_psci_present(void);
 bool __init acpi_psci_use_hvc(void);
@@ -25,4 +49,4 @@ static inline int psci_acpi_init(void) { return 0; }
 static inline bool acpi_psci_present(void) { return false; }
 #endif
 
-#endif /* __ASM_PSCI_H */
+#endif /* __LINUX_PSCI_H */