#define pr_fmt(fmt) "psci: " fmt
-#include <linux/acpi.h>
#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/acpi.h>
#include <asm/compiler.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
-
-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);
-};
-
-static struct psci_operations psci_ops;
-
-static int (*invoke_psci_fn)(u64, u64, u64, u64);
-typedef int (*psci_initcall_t)(const struct device_node *);
-
-asmlinkage int __invoke_psci_fn_hvc(u64, u64, u64, u64);
-asmlinkage int __invoke_psci_fn_smc(u64, u64, u64, u64);
-
-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,
-};
-
-static DEFINE_PER_CPU_READ_MOSTLY(struct psci_power_state *, 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_power_state_pack(struct psci_power_state state)
-{
- 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);
-}
-
-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;
-}
-
-static int psci_get_version(void)
-{
- 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;
-
- 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;
+static DEFINE_PER_CPU_READ_MOSTLY(u32 *, psci_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);
-}
-
-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;
-}
-
-static int psci_migrate_info_type(void)
-{
- int err;
- u32 fn;
-
- fn = psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE];
- err = invoke_psci_fn(fn, 0, 0, 0);
- return err;
-}
-
-static int __maybe_unused cpu_psci_cpu_init_idle(struct device_node *cpu_node,
- unsigned int cpu)
+static int __maybe_unused cpu_psci_cpu_init_idle(unsigned int cpu)
{
int i, ret, count = 0;
- struct psci_power_state *psci_states;
- struct device_node *state_node;
+ u32 *psci_states;
+ struct device_node *state_node, *cpu_node;
+
+ cpu_node = of_get_cpu_node(cpu, NULL);
+ if (!cpu_node)
+ return -ENODEV;
/*
* If the PSCI cpu_suspend function hook has not been initialized
return -ENOMEM;
for (i = 0; i < count; i++) {
- u32 psci_power_state;
+ u32 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);
+ &state);
if (ret) {
pr_warn(" * %s missing arm,psci-suspend-param property\n",
state_node->full_name);
}
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]);
+ pr_debug("psci-power-state %#x index %d\n", state, i);
+ if (!psci_power_state_is_valid(state)) {
+ pr_warn("Invalid PSCI power state %#x\n", state);
+ ret = -EINVAL;
+ goto free_mem;
+ }
+ psci_states[i] = state;
}
/* Idle states parsed correctly, initialize per-cpu pointer */
per_cpu(psci_power_state, cpu) = psci_states;
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);
-}
-
-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_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;
-}
-
-/*
- * Probe function for PSCI firmware versions >= 0.2
- */
-static int __init psci_probe(void)
-{
- int ver = psci_get_version();
-
- if (ver == PSCI_RET_NOT_SUPPORTED) {
- /*
- * PSCI versions >=0.2 mandates implementation of
- * PSCI_VERSION.
- */
- pr_err("PSCI firmware does not comply with the v0.2 spec.\n");
- return -EOPNOTSUPP;
- } 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) {
- pr_err("Conflicting PSCI version detected.\n");
- return -EINVAL;
- }
- }
-
- psci_0_2_set_functions();
-
- return 0;
-}
-
-/*
- * 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);
-}
-
-/*
- * 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();
-}
-
-#ifdef CONFIG_SMP
-
-static int __init cpu_psci_cpu_init(struct device_node *dn, unsigned int cpu)
+static int __init cpu_psci_cpu_init(unsigned int cpu)
{
return 0;
}
/* 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;
}
* 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,
- };
+ u32 state = PSCI_POWER_STATE_TYPE_POWER_DOWN <<
+ PSCI_0_2_POWER_STATE_TYPE_SHIFT;
ret = psci_ops.cpu_off(state);
int err, i;
if (!psci_ops.affinity_info)
- return 1;
+ return 0;
/*
* cpu_kill could race with cpu_die and we can
* potentially end up declaring this cpu undead
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;
+ return 0;
}
msleep(10);
pr_warn("CPU%d may not have shut down cleanly (AFFINITY_INFO reports %d)\n",
cpu, err);
- /* Make op_cpu_kill() fail. */
- return 0;
+ return -ETIMEDOUT;
}
#endif
-#endif
static int psci_suspend_finisher(unsigned long index)
{
- struct psci_power_state *state = __this_cpu_read(psci_power_state);
+ u32 *state = __this_cpu_read(psci_power_state);
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;
- struct psci_power_state *state = __this_cpu_read(psci_power_state);
+ u32 *state = __this_cpu_read(psci_power_state);
/*
* idle state index 0 corresponds to wfi, should never be called
* from the cpu_suspend operations
if (WARN_ON_ONCE(!index))
return -EINVAL;
- if (state[index - 1].type == PSCI_POWER_STATE_TYPE_STANDBY)
+ if (!psci_power_state_loses_context(state[index - 1]))
ret = psci_ops.cpu_suspend(state[index - 1], 0);
else
- ret = __cpu_suspend(index, psci_suspend_finisher);
+ ret = cpu_suspend(index, psci_suspend_finisher);
return ret;
}
.cpu_init_idle = cpu_psci_cpu_init_idle,
.cpu_suspend = cpu_psci_cpu_suspend,
#endif
-#ifdef CONFIG_SMP
.cpu_init = cpu_psci_cpu_init,
.cpu_prepare = cpu_psci_cpu_prepare,
.cpu_boot = cpu_psci_cpu_boot,
.cpu_die = cpu_psci_cpu_die,
.cpu_kill = cpu_psci_cpu_kill,
#endif
-#endif
};
Code Review / kvmfornfv.git / blobdiff