Unverified Commit 3137f2e6 authored by Dmitry Baryshkov's avatar Dmitry Baryshkov Committed by Arnd Bergmann
Browse files

firmware/psci: Add debugfs support to ease debugging 



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: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: default avatarMark Brown <broonie@kernel.org>
Reviewed-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20220926110758.666922-1-dmitry.baryshkov@linaro.org

'
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
parent 998fcd00

drivers/firmware/psci/psci.c

+115 −1
Original line number Diff line number Diff line
@@ -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)

{

include/uapi/linux/psci.h

+14 −0
Original line number Diff line number Diff line
@@ -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_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