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firmware/psci: Add debugfs support to ease debugging

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To ease debugging of PSCI supported features, add debugfs file called
'psci' describing PSCI and SMC CC versions, enabled features and
options.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20220926110758.666922-1-dmitry.baryshkov@linaro.org'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Dmitry Baryshkov 2022-09-26 14:07:58 +03:00 committed by Arnd Bergmann
parent 998fcd001f
commit 3137f2e600
No known key found for this signature in database
GPG key ID: 9A6C79EFE60018D9
2 changed files with 130 additions and 2 deletions
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116
drivers/firmware/psci/psci.c
View file

@ -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>
@ -326,12 +327,125 @@ 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)
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),
};
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)
{
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)
{

16
include/uapi/linux/psci.h
View file

@ -48,12 +48,26 @@
#define PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU PSCI_0_2_FN64(7)
#define PSCI_1_0_FN_PSCI_FEATURES PSCI_0_2_FN(10)
#define PSCI_1_0_FN_CPU_FREEZE PSCI_0_2_FN(11)
#define PSCI_1_0_FN_CPU_DEFAULT_SUSPEND PSCI_0_2_FN(12)
#define PSCI_1_0_FN_NODE_HW_STATE PSCI_0_2_FN(13)
#define PSCI_1_0_FN_SYSTEM_SUSPEND PSCI_0_2_FN(14)
#define PSCI_1_0_FN_SET_SUSPEND_MODE PSCI_0_2_FN(15)
#define PSCI_1_1_FN_SYSTEM_RESET2 PSCI_0_2_FN(18)
#define PSCI_1_0_FN_STAT_RESIDENCY PSCI_0_2_FN(16)
#define PSCI_1_0_FN_STAT_COUNT PSCI_0_2_FN(17)
#define PSCI_1_1_FN_SYSTEM_RESET2 PSCI_0_2_FN(18)
#define PSCI_1_1_FN_MEM_PROTECT PSCI_0_2_FN(19)
#define PSCI_1_1_FN_MEM_PROTECT_CHECK_RANGE PSCI_0_2_FN(19)
#define PSCI_1_0_FN64_CPU_DEFAULT_SUSPEND PSCI_0_2_FN64(12)
#define PSCI_1_0_FN64_NODE_HW_STATE PSCI_0_2_FN64(13)
#define PSCI_1_0_FN64_SYSTEM_SUSPEND PSCI_0_2_FN64(14)
#define PSCI_1_0_FN64_STAT_RESIDENCY PSCI_0_2_FN64(16)
#define PSCI_1_0_FN64_STAT_COUNT PSCI_0_2_FN64(17)
#define PSCI_1_1_FN64_SYSTEM_RESET2 PSCI_0_2_FN64(18)
#define PSCI_1_1_FN64_MEM_PROTECT_CHECK_RANGE PSCI_0_2_FN64(19)
/* PSCI v0.2 power state encoding for CPU_SUSPEND function */
#define PSCI_0_2_POWER_STATE_ID_MASK 0xffff