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Date: Thu, 9 Jul 2015 10:28:49 +0100
From: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To: Jisheng Zhang <jszhang@...vell.com>
Cc: "linux@....linux.org.uk" <linux@....linux.org.uk>,
Will Deacon <Will.Deacon@....com>,
Mark Rutland <Mark.Rutland@....com>,
"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
Catalin Marinas <Catalin.Marinas@....com>,
"galak@...eaurora.org" <galak@...eaurora.org>,
"agross@...eaurora.org" <agross@...eaurora.org>,
"davidb@...eaurora.org" <davidb@...eaurora.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
lina.iyer@...aro.org
Subject: Re: [PATCH v3 2/3] ARM: cpuidle: refine cpuidle_ops member's
parameters.
On Thu, Jul 09, 2015 at 09:43:04AM +0100, Jisheng Zhang wrote:
> On Thu, 9 Jul 2015 16:31:24 +0800
> Jisheng Zhang <jszhang@...vell.com> wrote:
>
> > As for the suspend member function, the to-be-suspended cpu is always
> > the calling cpu itself, so the 'cpu' parameter may not be necessary, let
> > driver get 'cpu' itself if need.
> >
> > As for the init member function, the device_node here may not be
> > necessary either, because we can get the node via. of_get_cpu_node().
>
> This patch also changes drivers/soc/qcom/spm.c accordingly, but I have no
> qcom platform, so I can't test it, just make sure it can pass kernel building.
> Could anyone kindly help me to test?
CC'ing Lina who should be able to help you test it.
Thanks,
Lorenzo
> Thanks a lot,
> Jisheng
>
> >
> > Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
> > ---
> > arch/arm/include/asm/cpuidle.h | 6 +++---
> > arch/arm/kernel/cpuidle.c | 8 ++++----
> > drivers/soc/qcom/spm.c | 17 ++++++++++++-----
> > 3 files changed, 19 insertions(+), 12 deletions(-)
> >
> > diff --git a/arch/arm/include/asm/cpuidle.h b/arch/arm/include/asm/cpuidle.h
> > index 0f84249..ca5dfe6 100644
> > --- a/arch/arm/include/asm/cpuidle.h
> > +++ b/arch/arm/include/asm/cpuidle.h
> > @@ -30,8 +30,8 @@ static inline int arm_cpuidle_simple_enter(struct cpuidle_device *dev,
> > struct device_node;
> >
> > struct cpuidle_ops {
> > - int (*suspend)(int cpu, unsigned long arg);
> > - int (*init)(struct device_node *, int cpu);
> > + int (*suspend)(unsigned long arg);
> > + int (*init)(unsigned int cpu);
> > };
> >
> > struct of_cpuidle_method {
> > @@ -46,6 +46,6 @@ struct of_cpuidle_method {
> >
> > extern int arm_cpuidle_suspend(int index);
> >
> > -extern int arm_cpuidle_init(int cpu);
> > +extern int arm_cpuidle_init(unsigned int cpu);
> >
> > #endif
> > diff --git a/arch/arm/kernel/cpuidle.c b/arch/arm/kernel/cpuidle.c
> > index 318da33..7bc7bc6 100644
> > --- a/arch/arm/kernel/cpuidle.c
> > +++ b/arch/arm/kernel/cpuidle.c
> > @@ -53,10 +53,10 @@ int arm_cpuidle_simple_enter(struct cpuidle_device *dev,
> > int arm_cpuidle_suspend(int index)
> > {
> > int ret = -EOPNOTSUPP;
> > - int cpu = smp_processor_id();
> > + unsigned int cpu = smp_processor_id();
> >
> > if (cpuidle_ops[cpu].suspend)
> > - ret = cpuidle_ops[cpu].suspend(cpu, index);
> > + ret = cpuidle_ops[cpu].suspend(index);
> >
> > return ret;
> > }
> > @@ -134,7 +134,7 @@ static int __init arm_cpuidle_read_ops(struct device_node *dn, int cpu)
> > * -ENXIO if the HW reports a failure or a misconfiguration,
> > * -ENOMEM if the HW report an memory allocation failure
> > */
> > -int __init arm_cpuidle_init(int cpu)
> > +int __init arm_cpuidle_init(unsigned int cpu)
> > {
> > struct device_node *cpu_node = of_cpu_device_node_get(cpu);
> > int ret;
> > @@ -144,7 +144,7 @@ int __init arm_cpuidle_init(int cpu)
> >
> > ret = arm_cpuidle_read_ops(cpu_node, cpu);
> > if (!ret && cpuidle_ops[cpu].init)
> > - ret = cpuidle_ops[cpu].init(cpu_node, cpu);
> > + ret = cpuidle_ops[cpu].init(cpu);
> >
> > of_node_put(cpu_node);
> >
> > diff --git a/drivers/soc/qcom/spm.c b/drivers/soc/qcom/spm.c
> > index b04b05a..1649ec3 100644
> > --- a/drivers/soc/qcom/spm.c
> > +++ b/drivers/soc/qcom/spm.c
> > @@ -116,7 +116,7 @@ static const struct spm_reg_data spm_reg_8064_cpu = {
> >
> > static DEFINE_PER_CPU(struct spm_driver_data *, cpu_spm_drv);
> >
> > -typedef int (*idle_fn)(int);
> > +typedef int (*idle_fn)(void);
> > static DEFINE_PER_CPU(idle_fn*, qcom_idle_ops);
> >
> > static inline void spm_register_write(struct spm_driver_data *drv,
> > @@ -179,9 +179,10 @@ static int qcom_pm_collapse(unsigned long int unused)
> > return -1;
> > }
> >
> > -static int qcom_cpu_spc(int cpu)
> > +static int qcom_cpu_spc(void)
> > {
> > int ret;
> > + int cpu = smp_processor_id();
> > struct spm_driver_data *drv = per_cpu(cpu_spm_drv, cpu);
> >
> > spm_set_low_power_mode(drv, PM_SLEEP_MODE_SPC);
> > @@ -197,9 +198,11 @@ static int qcom_cpu_spc(int cpu)
> > return ret;
> > }
> >
> > -static int qcom_idle_enter(int cpu, unsigned long index)
> > +static int qcom_idle_enter(unsigned long index)
> > {
> > - return per_cpu(qcom_idle_ops, cpu)[index](cpu);
> > + unsigned int cpu = smp_processor_id();
> > +
> > + return per_cpu(qcom_idle_ops, cpu)[index]();
> > }
> >
> > static const struct of_device_id qcom_idle_state_match[] __initconst = {
> > @@ -207,7 +210,7 @@ static const struct of_device_id qcom_idle_state_match[] __initconst = {
> > { },
> > };
> >
> > -static int __init qcom_cpuidle_init(struct device_node *cpu_node, int cpu)
> > +static int __init qcom_cpuidle_init(unsigned int cpu)
> > {
> > const struct of_device_id *match_id;
> > struct device_node *state_node;
> > @@ -217,6 +220,10 @@ static int __init qcom_cpuidle_init(struct device_node *cpu_node, int cpu)
> > idle_fn *fns;
> > cpumask_t mask;
> > bool use_scm_power_down = false;
> > + struct device_node *cpu_node = of_get_cpu_node(cpu, NULL);
> > +
> > + if (!cpu_node)
> > + return -ENODEV;
> >
> > for (i = 0; ; i++) {
> > state_node = of_parse_phandle(cpu_node, "cpu-idle-states", i);
>
--
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