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Date: Fri, 04 Dec 2009 21:00:52 +1100
From: Benjamin Herrenschmidt <benh@...nel.crashing.org>
To: arun@...ux.vnet.ibm.com
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Ingo Molnar <mingo@...e.hu>,
Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
Dipankar Sarma <dipankar@...ibm.com>,
Balbir Singh <balbir@...ibm.com>,
Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
linux-arch@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [v10 PATCH 8/9]: pSeries: implement pSeries processor idle
module
On Fri, 2009-12-04 at 13:45 +0530, Arun R Bharadwaj wrote:
>
> Hi Ben,
>
> I forgot to attach the patch which enables cpuidle for the rest of the
> POWER platforms. Attaching it below.
>
> So for these platforms, ppc_md.power_save will be called from from the
> cpuidle_idle_call idle loop itself. Also, this cpuidle_idle_call is
> not a pseries specific idle loop. It is a common loop for Intel and
> PPC which use cpuidle infrastructure.
Ok, so there was a missing piece in the puzzle ;-)
I'll review asap.
Cheers,
Ben.
> arun
>
>
>
> This patch enables cpuidle for the rest of the POWER platforms like
> 44x, Cell, Pasemi etc.
>
> Signed-off-by: Arun R Bharadwaj <arun@...ux.vnet.ibm.com>
> ---
> arch/powerpc/include/asm/system.h | 2 ++
> arch/powerpc/kernel/idle.c | 28 ++++++++++++++++++++++++++++
> arch/powerpc/kernel/setup_32.c | 8 ++++++--
> arch/powerpc/platforms/44x/idle.c | 2 ++
> arch/powerpc/platforms/cell/pervasive.c | 2 ++
> arch/powerpc/platforms/pasemi/idle.c | 2 ++
> arch/powerpc/platforms/ps3/setup.c | 2 ++
> 7 files changed, 44 insertions(+), 2 deletions(-)
>
> Index: linux.trees.git/arch/powerpc/include/asm/system.h
> ===================================================================
> --- linux.trees.git.orig/arch/powerpc/include/asm/system.h
> +++ linux.trees.git/arch/powerpc/include/asm/system.h
> @@ -551,8 +551,10 @@ void cpu_idle_wait(void);
>
> #ifdef CONFIG_CPU_IDLE
> extern void update_smt_snooze_delay(int snooze);
> +extern void setup_cpuidle_ppc(void);
> #else
> static inline void update_smt_snooze_delay(int snooze) {}
> +static inline void setup_cpuidle_ppc(void) {}
> #endif
>
> #endif /* __KERNEL__ */
> Index: linux.trees.git/arch/powerpc/kernel/idle.c
> ===================================================================
> --- linux.trees.git.orig/arch/powerpc/kernel/idle.c
> +++ linux.trees.git/arch/powerpc/kernel/idle.c
> @@ -129,6 +129,34 @@ void default_idle(void)
> HMT_very_low();
> }
>
> +#ifdef CONFIG_CPU_IDLE
> +DEFINE_PER_CPU(struct cpuidle_device, ppc_idle_devices);
> +struct cpuidle_driver cpuidle_ppc_driver = {
> + .name = "cpuidle_ppc",
> +};
> +
> +static void ppc_idle_loop(struct cpuidle_device *dev, struct cpuidle_state *st)
> +{
> + ppc_md.power_save();
> +}
> +
> +void setup_cpuidle_ppc(void)
> +{
> + struct cpuidle_device *dev;
> + int cpu;
> +
> + cpuidle_register_driver(&cpuidle_ppc_driver);
> +
> + for_each_online_cpu(cpu) {
> + dev = &per_cpu(ppc_idle_devices, cpu);
> + dev->cpu = cpu;
> + dev->states[0].enter = ppc_idle_loop;
> + dev->state_count = 1;
> + cpuidle_register_device(dev);
> + }
> +}
> +#endif
> +
> int powersave_nap;
>
> #ifdef CONFIG_SYSCTL
> Index: linux.trees.git/arch/powerpc/kernel/setup_32.c
> ===================================================================
> --- linux.trees.git.orig/arch/powerpc/kernel/setup_32.c
> +++ linux.trees.git/arch/powerpc/kernel/setup_32.c
> @@ -133,14 +133,18 @@ notrace void __init machine_init(unsigne
>
> #ifdef CONFIG_6xx
> if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
> - cpu_has_feature(CPU_FTR_CAN_NAP))
> + cpu_has_feature(CPU_FTR_CAN_NAP)) {
> ppc_md.power_save = ppc6xx_idle;
> + setup_cpuidle_ppc();
> + }
> #endif
>
> #ifdef CONFIG_E500
> if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
> - cpu_has_feature(CPU_FTR_CAN_NAP))
> + cpu_has_feature(CPU_FTR_CAN_NAP)) {
> ppc_md.power_save = e500_idle;
> + setup_cpuidle_ppc();
> + }
> #endif
> if (ppc_md.progress)
> ppc_md.progress("id mach(): done", 0x200);
> Index: linux.trees.git/arch/powerpc/platforms/44x/idle.c
> ===================================================================
> --- linux.trees.git.orig/arch/powerpc/platforms/44x/idle.c
> +++ linux.trees.git/arch/powerpc/platforms/44x/idle.c
> @@ -24,6 +24,7 @@
> #include <linux/of.h>
> #include <linux/kernel.h>
> #include <asm/machdep.h>
> +#include <asm/system.h>
>
> static int mode_spin;
>
> @@ -46,6 +47,7 @@ int __init ppc44x_idle_init(void)
> /* If we are not setting spin mode
> then we set to wait mode */
> ppc_md.power_save = &ppc44x_idle;
> + setup_cpuidle_ppc();
> }
>
> return 0;
> Index: linux.trees.git/arch/powerpc/platforms/cell/pervasive.c
> ===================================================================
> --- linux.trees.git.orig/arch/powerpc/platforms/cell/pervasive.c
> +++ linux.trees.git/arch/powerpc/platforms/cell/pervasive.c
> @@ -35,6 +35,7 @@
> #include <asm/pgtable.h>
> #include <asm/reg.h>
> #include <asm/cell-regs.h>
> +#include <asm/system.h>
>
> #include "pervasive.h"
>
> @@ -128,5 +129,6 @@ void __init cbe_pervasive_init(void)
> }
>
> ppc_md.power_save = cbe_power_save;
> + setup_cpuidle_ppc();
> ppc_md.system_reset_exception = cbe_system_reset_exception;
> }
> Index: linux.trees.git/arch/powerpc/platforms/pasemi/idle.c
> ===================================================================
> --- linux.trees.git.orig/arch/powerpc/platforms/pasemi/idle.c
> +++ linux.trees.git/arch/powerpc/platforms/pasemi/idle.c
> @@ -27,6 +27,7 @@
> #include <asm/machdep.h>
> #include <asm/reg.h>
> #include <asm/smp.h>
> +#include <asm/system.h>
>
> #include "pasemi.h"
>
> @@ -81,6 +82,7 @@ static int __init pasemi_idle_init(void)
>
> ppc_md.system_reset_exception = pasemi_system_reset_exception;
> ppc_md.power_save = modes[current_mode].entry;
> + setup_cpuidle_ppc();
> printk(KERN_INFO "Using PA6T idle loop (%s)\n", modes[current_mode].name);
>
> return 0;
> Index: linux.trees.git/arch/powerpc/platforms/ps3/setup.c
> ===================================================================
> --- linux.trees.git.orig/arch/powerpc/platforms/ps3/setup.c
> +++ linux.trees.git/arch/powerpc/platforms/ps3/setup.c
> @@ -33,6 +33,7 @@
> #include <asm/prom.h>
> #include <asm/lv1call.h>
> #include <asm/ps3gpu.h>
> +#include <asm/system.h>
>
> #include "platform.h"
>
> @@ -214,6 +215,7 @@ static void __init ps3_setup_arch(void)
> prealloc_ps3flash_bounce_buffer();
>
> ppc_md.power_save = ps3_power_save;
> + setup_cpuidle_ppc();
> ps3_os_area_init();
>
> DBG(" <- %s:%d\n", __func__, __LINE__);
> --
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