[PATCH v3 1/3] PSCI: Add initial support for PSCIv0.2 functions
Ashwin Chaugule
ashwin.chaugule at linaro.org
Thu Mar 27 17:23:48 EDT 2014
The PSCIv0.2 spec defines standard values of function IDs
and introduces a few new functions. Detect version of PSCI
and appropriately select the right PSCI functions.
Signed-off-by: Ashwin Chaugule <ashwin.chaugule at linaro.org>
---
arch/arm/include/asm/psci.h | 7 +-
arch/arm/kernel/psci.c | 151 +++++++++++++++++++++++++++++++++++++------
arch/arm64/kernel/psci.c | 154 +++++++++++++++++++++++++++++++++++++-------
include/uapi/linux/psci.h | 40 ++++++++++++
4 files changed, 307 insertions(+), 45 deletions(-)
create mode 100644 include/uapi/linux/psci.h
diff --git a/arch/arm/include/asm/psci.h b/arch/arm/include/asm/psci.h
index c4ae171..b93e34a 100644
--- a/arch/arm/include/asm/psci.h
+++ b/arch/arm/include/asm/psci.h
@@ -29,16 +29,19 @@ struct psci_operations {
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
-void psci_init(void);
+int psci_init(void);
bool psci_smp_available(void);
#else
-static inline void psci_init(void) { }
+static inline int psci_init(void) { }
static inline bool psci_smp_available(void) { return false; }
#endif
diff --git a/arch/arm/kernel/psci.c b/arch/arm/kernel/psci.c
index 4693188..e7cc62e 100644
--- a/arch/arm/kernel/psci.c
+++ b/arch/arm/kernel/psci.c
@@ -17,6 +17,7 @@
#include <linux/init.h>
#include <linux/of.h>
+#include <uapi/linux/psci.h>
#include <asm/compiler.h>
#include <asm/errno.h>
@@ -27,22 +28,20 @@
struct psci_operations psci_ops;
static int (*invoke_psci_fn)(u32, u32, u32, u32);
+typedef int (*psci_initcall_t)(const struct device_node *);
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 u32 psci_function_id[PSCI_FN_MAX];
-#define PSCI_RET_SUCCESS 0
-#define PSCI_RET_EOPNOTSUPP -1
-#define PSCI_RET_EINVAL -2
-#define PSCI_RET_EPERM -3
-
static int psci_to_linux_errno(int errno)
{
switch (errno) {
@@ -110,6 +109,21 @@ static noinline int __invoke_psci_fn_smc(u32 function_id, u32 arg0, u32 arg1,
return function_id;
}
+#define PSCI_VER_MAJOR_MASK 0xffff0000
+#define PSCI_VER_MINOR_MASK 0x0000ffff
+#define PSCI_VER_MAJOR_SHIFT 16
+#define PSCI_VER_MAJOR(ver) \
+ ((ver & PSCI_VER_MAJOR_MASK) >> PSCI_VER_MAJOR_SHIFT)
+#define PSCI_VER_MINOR(ver) (ver & PSCI_VER_MINOR_MASK)
+
+static int psci_get_version(void)
+{
+ int err;
+
+ err = invoke_psci_fn(PSCI_ID_VERSION, 0, 0, 0);
+ return err;
+}
+
static int psci_cpu_suspend(struct psci_power_state state,
unsigned long entry_point)
{
@@ -153,26 +167,36 @@ static int psci_migrate(unsigned long cpuid)
return psci_to_linux_errno(err);
}
-static const struct of_device_id psci_of_match[] __initconst = {
- { .compatible = "arm,psci", },
- {},
-};
+static int psci_affinity_info(unsigned long target_affinity,
+ unsigned long lowest_affinity_level)
+{
+ int err;
+ u32 fn;
-void __init psci_init(void)
+ 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)
{
- struct device_node *np;
- const char *method;
- u32 id;
+ int err;
+ u32 fn;
- np = of_find_matching_node(NULL, psci_of_match);
- if (!np)
- return;
+ fn = psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE];
+ err = invoke_psci_fn(fn, 0, 0, 0);
+ return err;
+}
- pr_info("probing function IDs from device-tree\n");
+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_warning("missing \"method\" property\n");
- goto out_put_node;
+ pr_warn("missing \"method\" property\n");
+ return -ENXIO;
}
if (!strcmp("hvc", method)) {
@@ -180,10 +204,75 @@ void __init psci_init(void)
} else if (!strcmp("smc", method)) {
invoke_psci_fn = __invoke_psci_fn_smc;
} else {
- pr_warning("invalid \"method\" property: %s\n", method);
+ pr_warn("invalid \"method\" property: %s\n", method);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/*
+ * PSCI Function IDs for v0.2+ are well defined so use
+ * standard values.
+ */
+static int psci_0_2_init(struct device_node *np)
+{
+ int err, ver;
+
+ err = get_set_conduit_method(np);
+
+ if (err)
+ goto out_put_node;
+
+ ver = psci_get_version();
+
+ pr_info("PSCIv%d.%d detected in firmware.\n", PSCI_VER_MAJOR(ver),
+ PSCI_VER_MINOR(ver));
+
+ if (PSCI_VER_MAJOR(ver) == 0 && PSCI_VER_MINOR(ver) < 2) {
+ err = -EINVAL;
+ pr_err("Conflicting PSCI version detected.\n");
goto out_put_node;
}
+ pr_info("Using standard PSCI v0.2 function IDs\n");
+ psci_function_id[PSCI_FN_CPU_SUSPEND] = PSCI_ID_CPU_SUSPEND_32;
+ psci_ops.cpu_suspend = psci_cpu_suspend;
+
+ psci_function_id[PSCI_FN_CPU_OFF] = PSCI_ID_CPU_OFF;
+ psci_ops.cpu_off = psci_cpu_off;
+
+ psci_function_id[PSCI_FN_CPU_ON] = PSCI_ID_CPU_ON_32;
+ psci_ops.cpu_on = psci_cpu_on;
+
+ psci_function_id[PSCI_FN_MIGRATE] = PSCI_ID_CPU_MIGRATE_32;
+ psci_ops.migrate = psci_migrate;
+
+ psci_function_id[PSCI_FN_AFFINITY_INFO] = PSCI_ID_AFFINITY_INFO_32;
+ psci_ops.affinity_info = psci_affinity_info;
+
+ psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE] = PSCI_ID_MIGRATE_INFO_TYPE;
+ psci_ops.migrate_info_type = psci_migrate_info_type;
+
+out_put_node:
+ of_node_put(np);
+ return err;
+}
+
+/*
+ * PSCI < v0.2 get PSCI Function IDs via DT.
+ */
+static int 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;
@@ -206,5 +295,25 @@ void __init psci_init(void)
out_put_node:
of_node_put(np);
- return;
+ 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_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);
}
diff --git a/arch/arm64/kernel/psci.c b/arch/arm64/kernel/psci.c
index 4f97db3..6b6590d 100644
--- a/arch/arm64/kernel/psci.c
+++ b/arch/arm64/kernel/psci.c
@@ -18,6 +18,7 @@
#include <linux/init.h>
#include <linux/of.h>
#include <linux/smp.h>
+#include <uapi/linux/psci.h>
#include <asm/compiler.h>
#include <asm/cpu_ops.h>
@@ -40,27 +41,28 @@ struct psci_operations {
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 *);
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 u32 psci_function_id[PSCI_FN_MAX];
-#define PSCI_RET_SUCCESS 0
-#define PSCI_RET_EOPNOTSUPP -1
-#define PSCI_RET_EINVAL -2
-#define PSCI_RET_EPERM -3
-
static int psci_to_linux_errno(int errno)
{
switch (errno) {
@@ -128,6 +130,21 @@ static noinline int __invoke_psci_fn_smc(u64 function_id, u64 arg0, u64 arg1,
return function_id;
}
+#define PSCI_VER_MAJOR_MASK 0xffff0000
+#define PSCI_VER_MINOR_MASK 0x0000ffff
+#define PSCI_VER_MAJOR_SHIFT 16
+#define PSCI_VER_MAJOR(ver) \
+ ((ver & PSCI_VER_MAJOR_MASK) >> PSCI_VER_MAJOR_SHIFT)
+#define PSCI_VER_MINOR(ver) (ver & PSCI_VER_MINOR_MASK)
+
+static int psci_get_version(void)
+{
+ int err;
+
+ err = invoke_psci_fn(PSCI_ID_VERSION, 0, 0, 0);
+ return err;
+}
+
static int psci_cpu_suspend(struct psci_power_state state,
unsigned long entry_point)
{
@@ -171,28 +188,36 @@ static int psci_migrate(unsigned long cpuid)
return psci_to_linux_errno(err);
}
-static const struct of_device_id psci_of_match[] __initconst = {
- { .compatible = "arm,psci", },
- {},
-};
+static int psci_affinity_info(unsigned long target_affinity,
+ unsigned long lowest_affinity_level)
+{
+ int err;
+ u32 fn;
-int __init psci_init(void)
+ 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)
{
- struct device_node *np;
- const char *method;
- u32 id;
- int err = 0;
+ int err;
+ u32 fn;
- np = of_find_matching_node(NULL, psci_of_match);
- if (!np)
- return -ENODEV;
+ fn = psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE];
+ err = invoke_psci_fn(fn, 0, 0, 0);
+ return err;
+}
- pr_info("probing function IDs from device-tree\n");
+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_warning("missing \"method\" property\n");
- err = -ENXIO;
- goto out_put_node;
+ pr_warn("missing \"method\" property\n");
+ return -ENXIO;
}
if (!strcmp("hvc", method)) {
@@ -200,11 +225,75 @@ int __init psci_init(void)
} else if (!strcmp("smc", method)) {
invoke_psci_fn = __invoke_psci_fn_smc;
} else {
- pr_warning("invalid \"method\" property: %s\n", method);
+ pr_warn("invalid \"method\" property: %s\n", method);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/*
+ * PSCI Function IDs for v0.2+ are well defined so use
+ * standard values.
+ */
+static int psci_0_2_init(struct device_node *np)
+{
+ int err, ver;
+
+ err = get_set_conduit_method(np);
+
+ if (err)
+ goto out_put_node;
+
+ ver = psci_get_version();
+
+ pr_info("PSCIv%d.%d detected in firmware.\n", PSCI_VER_MAJOR(ver),
+ PSCI_VER_MINOR(ver));
+
+ if (PSCI_VER_MAJOR(ver) == 0 && PSCI_VER_MINOR(ver) < 2) {
err = -EINVAL;
+ pr_err("Conflicting PSCI version detected.\n");
goto out_put_node;
}
+ pr_info("Using standard PSCI v0.2 function IDs\n");
+ psci_function_id[PSCI_FN_CPU_SUSPEND] = PSCI_ID_CPU_SUSPEND_64;
+ psci_ops.cpu_suspend = psci_cpu_suspend;
+
+ psci_function_id[PSCI_FN_CPU_OFF] = PSCI_ID_CPU_OFF;
+ psci_ops.cpu_off = psci_cpu_off;
+
+ psci_function_id[PSCI_FN_CPU_ON] = PSCI_ID_CPU_ON_64;
+ psci_ops.cpu_on = psci_cpu_on;
+
+ psci_function_id[PSCI_FN_MIGRATE] = PSCI_ID_CPU_MIGRATE_64;
+ psci_ops.migrate = psci_migrate;
+
+ psci_function_id[PSCI_FN_AFFINITY_INFO] = PSCI_ID_AFFINITY_INFO_64;
+ psci_ops.affinity_info = psci_affinity_info;
+
+ psci_function_id[PSCI_FN_MIGRATE_INFO_TYPE] = PSCI_ID_MIGRATE_INFO_TYPE;
+ psci_ops.migrate_info_type = psci_migrate_info_type;
+
+out_put_node:
+ of_node_put(np);
+ return err;
+}
+
+/*
+ * PSCI < v0.2 get PSCI Function IDs via DT.
+ */
+static int 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;
@@ -230,6 +319,27 @@ out_put_node:
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_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_SMP
static int __init cpu_psci_cpu_init(struct device_node *dn, unsigned int cpu)
diff --git a/include/uapi/linux/psci.h b/include/uapi/linux/psci.h
new file mode 100644
index 0000000..c523051
--- /dev/null
+++ b/include/uapi/linux/psci.h
@@ -0,0 +1,40 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * Copyright (C) 2014, Ashwin Chaugule <ashwin.chaugule at linaro.org>
+ */
+
+#ifndef _UAPI_LINUX_PSCI_H
+#define _UAPI_LINUX_PSCI_H
+
+/* PSCI Function IDs as per PSCI spec v0.2 */
+#define PSCI_ID_VERSION 0x84000000
+#define PSCI_ID_CPU_SUSPEND_32 0x84000001
+#define PSCI_ID_CPU_SUSPEND_64 0xc4000001
+#define PSCI_ID_CPU_OFF 0x84000002
+#define PSCI_ID_CPU_ON_32 0x84000003
+#define PSCI_ID_CPU_ON_64 0xC4000003
+#define PSCI_ID_AFFINITY_INFO_32 0x84000004
+#define PSCI_ID_AFFINITY_INFO_64 0xC4000004
+#define PSCI_ID_CPU_MIGRATE_32 0x84000005
+#define PSCI_ID_CPU_MIGRATE_64 0xc4000005
+#define PSCI_ID_MIGRATE_INFO_TYPE 0x84000006
+#define PSCI_ID_MIGRATE_INFO_UP_CPU_32 0x84000007
+#define PSCI_ID_MIGRATE_INFO_UP_CPU_64 0xc4000007
+#define PSCI_ID_SYSTEM_OFF 0x84000008
+#define PSCI_ID_SYSTEM_RESET 0x84000009
+
+#define PSCI_RET_SUCCESS 0
+#define PSCI_RET_EOPNOTSUPP -1
+#define PSCI_RET_EINVAL -2
+#define PSCI_RET_EPERM -3
+
+#endif /* _UAPI_LINUX_PSCI_H */
--
1.8.3.2
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