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cpuidle: Factor-out power domain related code from PSCI domain driver

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The generic power domain related code in PSCI domain driver is largely
independent of PSCI and can be shared with RISC-V SBI domain driver
hence we factor-out this code into dt_idle_genpd.c and dt_idle_genpd.h.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Anup Patel 2022-02-10 11:19:44 +05:30 committed by Palmer Dabbelt
parent b8200905e4
commit 9d976d6721
No known key found for this signature in database
GPG key ID: 2E1319F35FBB1889
8 changed files with 259 additions and 135 deletions
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7
MAINTAINERS
View file

@ -5051,6 +5051,13 @@ S: Supported
F: drivers/cpuidle/cpuidle-psci.h
F: drivers/cpuidle/cpuidle-psci-domain.c
CPUIDLE DRIVER - DT IDLE PM DOMAIN
M: Ulf Hansson <ulf.hansson@linaro.org>
L: linux-pm@vger.kernel.org
S: Supported
F: drivers/cpuidle/dt_idle_genpd.c
F: drivers/cpuidle/dt_idle_genpd.h
CRAMFS FILESYSTEM
M: Nicolas Pitre <nico@fluxnic.net>
S: Maintained

4
drivers/cpuidle/Kconfig
View file

@ -47,6 +47,10 @@ config CPU_IDLE_GOV_HALTPOLL
config DT_IDLE_STATES
bool
config DT_IDLE_GENPD
depends on PM_GENERIC_DOMAINS_OF
bool
menu "ARM CPU Idle Drivers"
depends on ARM || ARM64
source "drivers/cpuidle/Kconfig.arm"

1
drivers/cpuidle/Kconfig.arm
View file

@ -27,6 +27,7 @@ config ARM_PSCI_CPUIDLE_DOMAIN
bool "PSCI CPU idle Domain"
depends on ARM_PSCI_CPUIDLE
depends on PM_GENERIC_DOMAINS_OF
select DT_IDLE_GENPD
default y
help
Select this to enable the PSCI based CPUidle driver to use PM domains,

1
drivers/cpuidle/Makefile
View file

@ -6,6 +6,7 @@
obj-y += cpuidle.o driver.o governor.o sysfs.o governors/
obj-$(CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED) += coupled.o
obj-$(CONFIG_DT_IDLE_STATES) += dt_idle_states.o
obj-$(CONFIG_DT_IDLE_GENPD) += dt_idle_genpd.o
obj-$(CONFIG_ARCH_HAS_CPU_RELAX) += poll_state.o
obj-$(CONFIG_HALTPOLL_CPUIDLE) += cpuidle-haltpoll.o

138
drivers/cpuidle/cpuidle-psci-domain.c
View file

@ -47,73 +47,14 @@ static int psci_pd_power_off(struct generic_pm_domain *pd)
return 0;
}
static int psci_pd_parse_state_nodes(struct genpd_power_state *states,
int state_count)
{
int i, ret;
u32 psci_state, *psci_state_buf;
for (i = 0; i < state_count; i++) {
ret = psci_dt_parse_state_node(to_of_node(states[i].fwnode),
&psci_state);
if (ret)
goto free_state;
psci_state_buf = kmalloc(sizeof(u32), GFP_KERNEL);
if (!psci_state_buf) {
ret = -ENOMEM;
goto free_state;
}
*psci_state_buf = psci_state;
states[i].data = psci_state_buf;
}
return 0;
free_state:
i--;
for (; i >= 0; i--)
kfree(states[i].data);
return ret;
}
static int psci_pd_parse_states(struct device_node *np,
struct genpd_power_state **states, int *state_count)
{
int ret;
/* Parse the domain idle states. */
ret = of_genpd_parse_idle_states(np, states, state_count);
if (ret)
return ret;
/* Fill out the PSCI specifics for each found state. */
ret = psci_pd_parse_state_nodes(*states, *state_count);
if (ret)
kfree(*states);
return ret;
}
static void psci_pd_free_states(struct genpd_power_state *states,
unsigned int state_count)
{
int i;
for (i = 0; i < state_count; i++)
kfree(states[i].data);
kfree(states);
}
static int psci_pd_init(struct device_node *np, bool use_osi)
{
struct generic_pm_domain *pd;
struct psci_pd_provider *pd_provider;
struct dev_power_governor *pd_gov;
struct genpd_power_state *states = NULL;
int ret = -ENOMEM, state_count = 0;
pd = kzalloc(sizeof(*pd), GFP_KERNEL);
pd = dt_idle_pd_alloc(np, psci_dt_parse_state_node);
if (!pd)
goto out;
@ -121,22 +62,6 @@ static int psci_pd_init(struct device_node *np, bool use_osi)
if (!pd_provider)
goto free_pd;
pd->name = kasprintf(GFP_KERNEL, "%pOF", np);
if (!pd->name)
goto free_pd_prov;
/*
* Parse the domain idle states and let genpd manage the state selection
* for those being compatible with "domain-idle-state".
*/
ret = psci_pd_parse_states(np, &states, &state_count);
if (ret)
goto free_name;
pd->free_states = psci_pd_free_states;
pd->name = kbasename(pd->name);
pd->states = states;
pd->state_count = state_count;
pd->flags |= GENPD_FLAG_IRQ_SAFE | GENPD_FLAG_CPU_DOMAIN;
/* Allow power off when OSI has been successfully enabled. */
@ -149,10 +74,8 @@ static int psci_pd_init(struct device_node *np, bool use_osi)
pd_gov = state_count > 0 ? &pm_domain_cpu_gov : NULL;
ret = pm_genpd_init(pd, pd_gov, false);
if (ret) {
psci_pd_free_states(states, state_count);
goto free_name;
}
if (ret)
goto free_pd_prov;
ret = of_genpd_add_provider_simple(np, pd);
if (ret)
@ -166,12 +89,10 @@ static int psci_pd_init(struct device_node *np, bool use_osi)
remove_pd:
pm_genpd_remove(pd);
free_name:
kfree(pd->name);
free_pd_prov:
kfree(pd_provider);
free_pd:
kfree(pd);
dt_idle_pd_free(pd);
out:
pr_err("failed to init PM domain ret=%d %pOF\n", ret, np);
return ret;
@ -195,30 +116,6 @@ static void psci_pd_remove(void)
}
}
static int psci_pd_init_topology(struct device_node *np)
{
struct device_node *node;
struct of_phandle_args child, parent;
int ret;
for_each_child_of_node(np, node) {
if (of_parse_phandle_with_args(node, "power-domains",
"#power-domain-cells", 0, &parent))
continue;
child.np = node;
child.args_count = 0;
ret = of_genpd_add_subdomain(&parent, &child);
of_node_put(parent.np);
if (ret) {
of_node_put(node);
return ret;
}
}
return 0;
}
static bool psci_pd_try_set_osi_mode(void)
{
int ret;
@ -282,7 +179,7 @@ static int psci_cpuidle_domain_probe(struct platform_device *pdev)
goto no_pd;
/* Link genpd masters/subdomains to model the CPU topology. */
ret = psci_pd_init_topology(np);
ret = dt_idle_pd_init_topology(np);
if (ret)
goto remove_pd;
@ -314,28 +211,3 @@ static int __init psci_idle_init_domains(void)
return platform_driver_register(&psci_cpuidle_domain_driver);
}
subsys_initcall(psci_idle_init_domains);
struct device *psci_dt_attach_cpu(int cpu)
{
struct device *dev;
dev = dev_pm_domain_attach_by_name(get_cpu_device(cpu), "psci");
if (IS_ERR_OR_NULL(dev))
return dev;
pm_runtime_irq_safe(dev);
if (cpu_online(cpu))
pm_runtime_get_sync(dev);
dev_pm_syscore_device(dev, true);
return dev;
}
void psci_dt_detach_cpu(struct device *dev)
{
if (IS_ERR_OR_NULL(dev))
return;
dev_pm_domain_detach(dev, false);
}

15
drivers/cpuidle/cpuidle-psci.h
View file

@ -10,8 +10,19 @@ void psci_set_domain_state(u32 state);
int psci_dt_parse_state_node(struct device_node *np, u32 *state);
#ifdef CONFIG_ARM_PSCI_CPUIDLE_DOMAIN
struct device *psci_dt_attach_cpu(int cpu);
void psci_dt_detach_cpu(struct device *dev);
#include "dt_idle_genpd.h"
static inline struct device *psci_dt_attach_cpu(int cpu)
{
return dt_idle_attach_cpu(cpu, "psci");
}
static inline void psci_dt_detach_cpu(struct device *dev)
{
dt_idle_detach_cpu(dev);
}
#else
static inline struct device *psci_dt_attach_cpu(int cpu) { return NULL; }
static inline void psci_dt_detach_cpu(struct device *dev) { }

178
drivers/cpuidle/dt_idle_genpd.c Normal file
View file

@ -0,0 +1,178 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* PM domains for CPUs via genpd.
*
* Copyright (C) 2019 Linaro Ltd.
* Author: Ulf Hansson <ulf.hansson@linaro.org>
*
* Copyright (c) 2021 Western Digital Corporation or its affiliates.
* Copyright (c) 2022 Ventana Micro Systems Inc.
*/
#define pr_fmt(fmt) "dt-idle-genpd: " fmt
#include <linux/cpu.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/string.h>
#include "dt_idle_genpd.h"
static int pd_parse_state_nodes(
int (*parse_state)(struct device_node *, u32 *),
struct genpd_power_state *states, int state_count)
{
int i, ret;
u32 state, *state_buf;
for (i = 0; i < state_count; i++) {
ret = parse_state(to_of_node(states[i].fwnode), &state);
if (ret)
goto free_state;
state_buf = kmalloc(sizeof(u32), GFP_KERNEL);
if (!state_buf) {
ret = -ENOMEM;
goto free_state;
}
*state_buf = state;
states[i].data = state_buf;
}
return 0;
free_state:
i--;
for (; i >= 0; i--)
kfree(states[i].data);
return ret;
}
static int pd_parse_states(struct device_node *np,
int (*parse_state)(struct device_node *, u32 *),
struct genpd_power_state **states,
int *state_count)
{
int ret;
/* Parse the domain idle states. */
ret = of_genpd_parse_idle_states(np, states, state_count);
if (ret)
return ret;
/* Fill out the dt specifics for each found state. */
ret = pd_parse_state_nodes(parse_state, *states, *state_count);
if (ret)
kfree(*states);
return ret;
}
static void pd_free_states(struct genpd_power_state *states,
unsigned int state_count)
{
int i;
for (i = 0; i < state_count; i++)
kfree(states[i].data);
kfree(states);
}
void dt_idle_pd_free(struct generic_pm_domain *pd)
{
pd_free_states(pd->states, pd->state_count);
kfree(pd->name);
kfree(pd);
}
struct generic_pm_domain *dt_idle_pd_alloc(struct device_node *np,
int (*parse_state)(struct device_node *, u32 *))
{
struct generic_pm_domain *pd;
struct genpd_power_state *states = NULL;
int ret, state_count = 0;
pd = kzalloc(sizeof(*pd), GFP_KERNEL);
if (!pd)
goto out;
pd->name = kasprintf(GFP_KERNEL, "%pOF", np);
if (!pd->name)
goto free_pd;
/*
* Parse the domain idle states and let genpd manage the state selection
* for those being compatible with "domain-idle-state".
*/
ret = pd_parse_states(np, parse_state, &states, &state_count);
if (ret)
goto free_name;
pd->free_states = pd_free_states;
pd->name = kbasename(pd->name);
pd->states = states;
pd->state_count = state_count;
pr_debug("alloc PM domain %s\n", pd->name);
return pd;
free_name:
kfree(pd->name);
free_pd:
kfree(pd);
out:
pr_err("failed to alloc PM domain %pOF\n", np);
return NULL;
}
int dt_idle_pd_init_topology(struct device_node *np)
{
struct device_node *node;
struct of_phandle_args child, parent;
int ret;
for_each_child_of_node(np, node) {
if (of_parse_phandle_with_args(node, "power-domains",
"#power-domain-cells", 0, &parent))
continue;
child.np = node;
child.args_count = 0;
ret = of_genpd_add_subdomain(&parent, &child);
of_node_put(parent.np);
if (ret) {
of_node_put(node);
return ret;
}
}
return 0;
}
struct device *dt_idle_attach_cpu(int cpu, const char *name)
{
struct device *dev;
dev = dev_pm_domain_attach_by_name(get_cpu_device(cpu), name);
if (IS_ERR_OR_NULL(dev))
return dev;
pm_runtime_irq_safe(dev);
if (cpu_online(cpu))
pm_runtime_get_sync(dev);
dev_pm_syscore_device(dev, true);
return dev;
}
void dt_idle_detach_cpu(struct device *dev)
{
if (IS_ERR_OR_NULL(dev))
return;
dev_pm_domain_detach(dev, false);
}

50
drivers/cpuidle/dt_idle_genpd.h Normal file
View file

@ -0,0 +1,50 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __DT_IDLE_GENPD
#define __DT_IDLE_GENPD
struct device_node;
struct generic_pm_domain;
#ifdef CONFIG_DT_IDLE_GENPD
void dt_idle_pd_free(struct generic_pm_domain *pd);
struct generic_pm_domain *dt_idle_pd_alloc(struct device_node *np,
int (*parse_state)(struct device_node *, u32 *));
int dt_idle_pd_init_topology(struct device_node *np);
struct device *dt_idle_attach_cpu(int cpu, const char *name);
void dt_idle_detach_cpu(struct device *dev);
#else
static inline void dt_idle_pd_free(struct generic_pm_domain *pd)
{
}
static inline struct generic_pm_domain *dt_idle_pd_alloc(
struct device_node *np,
int (*parse_state)(struct device_node *, u32 *))
{
return NULL;
}
static inline int dt_idle_pd_init_topology(struct device_node *np)
{
return 0;
}
static inline struct device *dt_idle_attach_cpu(int cpu, const char *name)
{
return NULL;
}
static inline void dt_idle_detach_cpu(struct device *dev)
{
}
#endif
#endif