1 files changed, 207 insertions, 20 deletions

diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c
index cfb448eabdaa..38ca190d4a22 100644
--- a/drivers/firmware/psci/psci.c
+++ b/drivers/firmware/psci/psci.c
@@ -9,6 +9,7 @@
 #include <linux/acpi.h>
 #include <linux/arm-smccc.h>
 #include <linux/cpuidle.h>
+#include <linux/debugfs.h>
 #include <linux/errno.h>
 #include <linux/linkage.h>
 #include <linux/of.h>
@@ -77,6 +78,7 @@ struct psci_0_1_function_ids get_psci_0_1_function_ids(void)
 
 static u32 psci_cpu_suspend_feature;
 static bool psci_system_reset2_supported;
+static bool psci_system_off2_hibernate_supported;
 
 static inline bool psci_has_ext_power_state(void)
 {
@@ -107,9 +109,10 @@ bool psci_power_state_is_valid(u32 state)
 	return !(state & ~valid_mask);
 }
 
-static unsigned long __invoke_psci_fn_hvc(unsigned long function_id,
-			unsigned long arg0, unsigned long arg1,
-			unsigned long arg2)
+static __always_inline unsigned long
+__invoke_psci_fn_hvc(unsigned long function_id,
+		     unsigned long arg0, unsigned long arg1,
+		     unsigned long arg2)
 {
 	struct arm_smccc_res res;
 
@@ -117,9 +120,10 @@ static unsigned long __invoke_psci_fn_hvc(unsigned long function_id,
 	return res.a0;
 }
 
-static unsigned long __invoke_psci_fn_smc(unsigned long function_id,
-			unsigned long arg0, unsigned long arg1,
-			unsigned long arg2)
+static __always_inline unsigned long
+__invoke_psci_fn_smc(unsigned long function_id,
+		     unsigned long arg0, unsigned long arg1,
+		     unsigned long arg2)
 {
 	struct arm_smccc_res res;
 
@@ -127,7 +131,7 @@ static unsigned long __invoke_psci_fn_smc(unsigned long function_id,
 	return res.a0;
 }
 
-static int psci_to_linux_errno(int errno)
+static __always_inline int psci_to_linux_errno(int errno)
 {
 	switch (errno) {
 	case PSCI_RET_SUCCESS:
@@ -163,10 +167,14 @@ int psci_set_osi_mode(bool enable)
 			PSCI_1_0_SUSPEND_MODE_PC;
 
 	err = invoke_psci_fn(PSCI_1_0_FN_SET_SUSPEND_MODE, suspend_mode, 0, 0);
+	if (err < 0)
+		pr_info(FW_BUG "failed to set %s mode: %d\n",
+				enable ? "OSI" : "PC", err);
 	return psci_to_linux_errno(err);
 }
 
-static int __psci_cpu_suspend(u32 fn, u32 state, unsigned long entry_point)
+static __always_inline int
+__psci_cpu_suspend(u32 fn, u32 state, unsigned long entry_point)
 {
 	int err;
 
@@ -174,13 +182,15 @@ static int __psci_cpu_suspend(u32 fn, u32 state, unsigned long entry_point)
 	return psci_to_linux_errno(err);
 }
 
-static int psci_0_1_cpu_suspend(u32 state, unsigned long entry_point)
+static __always_inline int
+psci_0_1_cpu_suspend(u32 state, unsigned long entry_point)
 {
 	return __psci_cpu_suspend(psci_0_1_function_ids.cpu_suspend,
 				  state, entry_point);
 }
 
-static int psci_0_2_cpu_suspend(u32 state, unsigned long entry_point)
+static __always_inline int
+psci_0_2_cpu_suspend(u32 state, unsigned long entry_point)
 {
 	return __psci_cpu_suspend(PSCI_FN_NATIVE(0_2, CPU_SUSPEND),
 				  state, entry_point);
@@ -274,7 +284,7 @@ static void set_conduit(enum arm_smccc_conduit conduit)
 	psci_conduit = conduit;
 }
 
-static int get_set_conduit_method(struct device_node *np)
+static int get_set_conduit_method(const struct device_node *np)
 {
 	const char *method;
 
@@ -324,17 +334,166 @@ static void psci_sys_poweroff(void)
 	invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
 }
 
-static int __init psci_features(u32 psci_func_id)
+#ifdef CONFIG_HIBERNATION
+static int psci_sys_hibernate(struct sys_off_data *data)
+{
+	/*
+	 * If no hibernate type is specified SYSTEM_OFF2 defaults to selecting
+	 * HIBERNATE_OFF.
+	 *
+	 * There are hypervisors in the wild that do not align with the spec and
+	 * reject calls that explicitly provide a hibernate type. For
+	 * compatibility with these nonstandard implementations, pass 0 as the
+	 * type.
+	 */
+	if (system_entering_hibernation())
+		invoke_psci_fn(PSCI_FN_NATIVE(1_3, SYSTEM_OFF2), 0, 0, 0);
+	return NOTIFY_DONE;
+}
+
+static int __init psci_hibernate_init(void)
+{
+	if (psci_system_off2_hibernate_supported) {
+		/* Higher priority than EFI shutdown, but only for hibernate */
+		register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
+					 SYS_OFF_PRIO_FIRMWARE + 2,
+					 psci_sys_hibernate, NULL);
+	}
+	return 0;
+}
+subsys_initcall(psci_hibernate_init);
+#endif
+
+static int psci_features(u32 psci_func_id)
 {
 	return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES,
 			      psci_func_id, 0, 0);
 }
 
+#ifdef CONFIG_DEBUG_FS
+
+#define PSCI_ID(ver, _name) \
+	{ .fn = PSCI_##ver##_FN_##_name, .name = #_name, }
+#define PSCI_ID_NATIVE(ver, _name) \
+	{ .fn = PSCI_FN_NATIVE(ver, _name), .name = #_name, }
+
+/* A table of all optional functions */
+static const struct {
+	u32 fn;
+	const char *name;
+} psci_fn_ids[] = {
+	PSCI_ID_NATIVE(0_2, MIGRATE),
+	PSCI_ID(0_2, MIGRATE_INFO_TYPE),
+	PSCI_ID_NATIVE(0_2, MIGRATE_INFO_UP_CPU),
+	PSCI_ID(1_0, CPU_FREEZE),
+	PSCI_ID_NATIVE(1_0, CPU_DEFAULT_SUSPEND),
+	PSCI_ID_NATIVE(1_0, NODE_HW_STATE),
+	PSCI_ID_NATIVE(1_0, SYSTEM_SUSPEND),
+	PSCI_ID(1_0, SET_SUSPEND_MODE),
+	PSCI_ID_NATIVE(1_0, STAT_RESIDENCY),
+	PSCI_ID_NATIVE(1_0, STAT_COUNT),
+	PSCI_ID_NATIVE(1_1, SYSTEM_RESET2),
+	PSCI_ID(1_1, MEM_PROTECT),
+	PSCI_ID_NATIVE(1_1, MEM_PROTECT_CHECK_RANGE),
+	PSCI_ID_NATIVE(1_3, SYSTEM_OFF2),
+};
+
+static int psci_debugfs_read(struct seq_file *s, void *data)
+{
+	int feature, type, i;
+	u32 ver;
+
+	ver = psci_ops.get_version();
+	seq_printf(s, "PSCIv%d.%d\n",
+		   PSCI_VERSION_MAJOR(ver),
+		   PSCI_VERSION_MINOR(ver));
+
+	/* PSCI_FEATURES is available only starting from 1.0 */
+	if (PSCI_VERSION_MAJOR(ver) < 1)
+		return 0;
+
+	feature = psci_features(ARM_SMCCC_VERSION_FUNC_ID);
+	if (feature != PSCI_RET_NOT_SUPPORTED) {
+		ver = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0);
+		seq_printf(s, "SMC Calling Convention v%d.%d\n",
+			   PSCI_VERSION_MAJOR(ver),
+			   PSCI_VERSION_MINOR(ver));
+	} else {
+		seq_puts(s, "SMC Calling Convention v1.0 is assumed\n");
+	}
+
+	feature = psci_features(PSCI_FN_NATIVE(0_2, CPU_SUSPEND));
+	if (feature < 0) {
+		seq_printf(s, "PSCI_FEATURES(CPU_SUSPEND) error (%d)\n", feature);
+	} else {
+		seq_printf(s, "OSI is %ssupported\n",
+			   (feature & BIT(0)) ? "" : "not ");
+		seq_printf(s, "%s StateID format is used\n",
+			   (feature & BIT(1)) ? "Extended" : "Original");
+	}
+
+	type = psci_ops.migrate_info_type();
+	if (type == PSCI_0_2_TOS_UP_MIGRATE ||
+	    type == PSCI_0_2_TOS_UP_NO_MIGRATE) {
+		unsigned long cpuid;
+
+		seq_printf(s, "Trusted OS %smigrate capable\n",
+			   type == PSCI_0_2_TOS_UP_NO_MIGRATE ? "not " : "");
+		cpuid = psci_migrate_info_up_cpu();
+		seq_printf(s, "Trusted OS resident on physical CPU 0x%lx (#%d)\n",
+			   cpuid, resident_cpu);
+	} else if (type == PSCI_0_2_TOS_MP) {
+		seq_puts(s, "Trusted OS migration not required\n");
+	} else {
+		if (type != PSCI_RET_NOT_SUPPORTED)
+			seq_printf(s, "MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);
+	}
+
+	for (i = 0; i < ARRAY_SIZE(psci_fn_ids); i++) {
+		feature = psci_features(psci_fn_ids[i].fn);
+		if (feature == PSCI_RET_NOT_SUPPORTED)
+			continue;
+		if (feature < 0)
+			seq_printf(s, "PSCI_FEATURES(%s) error (%d)\n",
+				   psci_fn_ids[i].name, feature);
+		else
+			seq_printf(s, "%s is supported\n", psci_fn_ids[i].name);
+	}
+
+	return 0;
+}
+
+static int psci_debugfs_open(struct inode *inode, struct file *f)
+{
+	return single_open(f, psci_debugfs_read, NULL);
+}
+
+static const struct file_operations psci_debugfs_ops = {
+	.owner = THIS_MODULE,
+	.open = psci_debugfs_open,
+	.release = single_release,
+	.read = seq_read,
+	.llseek = seq_lseek
+};
+
+static int __init psci_debugfs_init(void)
+{
+	if (!invoke_psci_fn || !psci_ops.get_version)
+		return 0;
+
+	return PTR_ERR_OR_ZERO(debugfs_create_file("psci", 0444, NULL, NULL,
+						   &psci_debugfs_ops));
+}
+late_initcall(psci_debugfs_init)
+#endif
+
 #ifdef CONFIG_CPU_IDLE
-static int psci_suspend_finisher(unsigned long state)
+static noinstr int psci_suspend_finisher(unsigned long state)
 {
 	u32 power_state = state;
-	phys_addr_t pa_cpu_resume = __pa_symbol(function_nocfi(cpu_resume));
+	phys_addr_t pa_cpu_resume;
+
+	pa_cpu_resume = __pa_symbol_nodebug((unsigned long)cpu_resume);
 
 	return psci_ops.cpu_suspend(power_state, pa_cpu_resume);
 }
@@ -346,11 +505,22 @@ int psci_cpu_suspend_enter(u32 state)
 	if (!psci_power_state_loses_context(state)) {
 		struct arm_cpuidle_irq_context context;
 
+		ct_cpuidle_enter();
 		arm_cpuidle_save_irq_context(&context);
 		ret = psci_ops.cpu_suspend(state, 0);
 		arm_cpuidle_restore_irq_context(&context);
+		ct_cpuidle_exit();
 	} else {
+		/*
+		 * ARM64 cpu_suspend() wants to do ct_cpuidle_*() itself.
+		 */
+		if (!IS_ENABLED(CONFIG_ARM64))
+			ct_cpuidle_enter();
+
 		ret = cpu_suspend(state, psci_suspend_finisher);
+
+		if (!IS_ENABLED(CONFIG_ARM64))
+			ct_cpuidle_exit();
 	}
 
 	return ret;
@@ -359,10 +529,12 @@ int psci_cpu_suspend_enter(u32 state)
 
 static int psci_system_suspend(unsigned long unused)
 {
-	phys_addr_t pa_cpu_resume = __pa_symbol(function_nocfi(cpu_resume));
+	int err;
+	phys_addr_t pa_cpu_resume = __pa_symbol(cpu_resume);
 
-	return invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),
+	err = invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),
 			      pa_cpu_resume, 0, 0);
+	return psci_to_linux_errno(err);
 }
 
 static int psci_system_suspend_enter(suspend_state_t state)
@@ -385,6 +557,18 @@ static void __init psci_init_system_reset2(void)
 		psci_system_reset2_supported = true;
 }
 
+static void __init psci_init_system_off2(void)
+{
+	int ret;
+
+	ret = psci_features(PSCI_FN_NATIVE(1_3, SYSTEM_OFF2));
+	if (ret < 0)
+		return;
+
+	if (ret & PSCI_1_3_OFF_TYPE_HIBERNATE_OFF)
+		psci_system_off2_hibernate_supported = true;
+}
+
 static void __init psci_init_system_suspend(void)
 {
 	int ret;
@@ -515,6 +699,7 @@ static int __init psci_probe(void)
 		psci_init_cpu_suspend();
 		psci_init_system_suspend();
 		psci_init_system_reset2();
+		psci_init_system_off2();
 		kvm_init_hyp_services();
 	}
 
@@ -528,7 +713,7 @@ typedef int (*psci_initcall_t)(const struct device_node *);
  *
  * Probe based on PSCI PSCI_VERSION function
  */
-static int __init psci_0_2_init(struct device_node *np)
+static int __init psci_0_2_init(const struct device_node *np)
 {
 	int err;
 
@@ -549,7 +734,7 @@ static int __init psci_0_2_init(struct device_node *np)
 /*
  * PSCI < v0.2 get PSCI Function IDs via DT.
  */
-static int __init psci_0_1_init(struct device_node *np)
+static int __init psci_0_1_init(const struct device_node *np)
 {
 	u32 id;
 	int err;
@@ -585,7 +770,7 @@ static int __init psci_0_1_init(struct device_node *np)
 	return 0;
 }
 
-static int __init psci_1_0_init(struct device_node *np)
+static int __init psci_1_0_init(const struct device_node *np)
 {
 	int err;
 
@@ -619,8 +804,10 @@ int __init psci_dt_init(void)
 
 	np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
 
-	if (!np || !of_device_is_available(np))
+	if (!np || !of_device_is_available(np)) {
+		of_node_put(np);
 		return -ENODEV;
+	}
 
 	init_fn = (psci_initcall_t)matched_np->data;
 	ret = init_fn(np);