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Date: Fri, 15 May 2015 02:17:08 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Viresh Kumar <viresh.kumar@...aro.org>
Cc: Sudeep Holla <sudeep.holla@....com>,
"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Jon Medhurst <tixy@...aro.org>
Subject: Re: [PATCH v2] cpufreq: arm_big_little: remove compile-time dependency on BIG_LITTLE
On Wednesday, May 13, 2015 06:30:23 PM Viresh Kumar wrote:
> On 13 May 2015 at 18:05, Sudeep Holla <sudeep.holla@....com> wrote:
> > With the addition of switcher code, there's compile-time dependency on
> > BIG_LITTLE to get arm_big_little driver compiling on ARM64. Since ARM64
> > will never add support for bL switcher, it's better to remove the
> > dependency so that the driver can be reused on ARM64 platforms.
> >
> > This patch adds stubs to remove BIG_LITTLE dependency in the driver.
> >
> > Cc: Viresh Kumar <viresh.kumar@...aro.org>
> > Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> > Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> > ---
> > drivers/cpufreq/Kconfig.arm | 2 +-
> > drivers/cpufreq/arm_big_little.c | 27 ++++++++++++++++++++++-----
> > 2 files changed, 23 insertions(+), 6 deletions(-)
> >
> > Changes v1->v2: replaced BL_SWITCHER with BIG_LITTLE in the title and
> > commit log as suggested by Viresh
> >
> > Hi Viresh,
> >
> > As replied in the thread, I have retained one change which you suspected
> > as not necessary, in order to fix the warning we get.
> >
> > Regards,
> > Sudeep
> >
> >
> > diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
> > index 4f3dbc8cf729..611cb09239eb 100644
> > --- a/drivers/cpufreq/Kconfig.arm
> > +++ b/drivers/cpufreq/Kconfig.arm
> > @@ -5,7 +5,7 @@
> > # big LITTLE core layer and glue drivers
> > config ARM_BIG_LITTLE_CPUFREQ
> > tristate "Generic ARM big LITTLE CPUfreq driver"
> > - depends on ARM && BIG_LITTLE && ARM_CPU_TOPOLOGY && HAVE_CLK
> > + depends on (ARM_CPU_TOPOLOGY || ARM64) && HAVE_CLK
> > select PM_OPP
> > help
> > This enables the Generic CPUfreq driver for ARM big.LITTLE platforms.
> > diff --git a/drivers/cpufreq/arm_big_little.c b/drivers/cpufreq/arm_big_little.c
> > index e4d75ca9f3b0..f1e42f8ce0fc 100644
> > --- a/drivers/cpufreq/arm_big_little.c
> > +++ b/drivers/cpufreq/arm_big_little.c
> > @@ -31,7 +31,6 @@
> > #include <linux/slab.h>
> > #include <linux/topology.h>
> > #include <linux/types.h>
> > -#include <asm/bL_switcher.h>
> >
> > #include "arm_big_little.h"
> >
> > @@ -41,12 +40,16 @@
> > #define MAX_CLUSTERS 2
> >
> > #ifdef CONFIG_BL_SWITCHER
> > +#include <asm/bL_switcher.h>
> > static bool bL_switching_enabled;
> > #define is_bL_switching_enabled() bL_switching_enabled
> > #define set_switching_enabled(x) (bL_switching_enabled = (x))
> > #else
> > #define is_bL_switching_enabled() false
> > #define set_switching_enabled(x) do { } while (0)
> > +#define bL_switch_request(...) do { } while (0)
> > +#define bL_switcher_put_enabled() do { } while (0)
> > +#define bL_switcher_get_enabled() do { } while (0)
> > #endif
> >
> > #define ACTUAL_FREQ(cluster, freq) ((cluster == A7_CLUSTER) ? freq << 1 : freq)
> > @@ -513,6 +516,7 @@ static struct cpufreq_driver bL_cpufreq_driver = {
> > .attr = cpufreq_generic_attr,
> > };
> >
> > +#ifdef CONFIG_BL_SWITCHER
> > static int bL_cpufreq_switcher_notifier(struct notifier_block *nfb,
> > unsigned long action, void *_arg)
> > {
> > @@ -545,6 +549,20 @@ static struct notifier_block bL_switcher_notifier = {
> > .notifier_call = bL_cpufreq_switcher_notifier,
> > };
> >
> > +static int __bLs_register_notifier(void)
> > +{
> > + return bL_switcher_register_notifier(&bL_switcher_notifier);
> > +}
> > +
> > +static int __bLs_unregister_notifier(void)
> > +{
> > + return bL_switcher_unregister_notifier(&bL_switcher_notifier);
> > +}
> > +#else
> > +static int __bLs_register_notifier(void) { return 0; }
> > +static int __bLs_unregister_notifier(void) { return 0; }
> > +#endif
> > +
> > int bL_cpufreq_register(struct cpufreq_arm_bL_ops *ops)
> > {
> > int ret, i;
> > @@ -562,8 +580,7 @@ int bL_cpufreq_register(struct cpufreq_arm_bL_ops *ops)
> >
> > arm_bL_ops = ops;
> >
> > - ret = bL_switcher_get_enabled();
> > - set_switching_enabled(ret);
> > + set_switching_enabled(bL_switcher_get_enabled());
> >
> > for (i = 0; i < MAX_CLUSTERS; i++)
> > mutex_init(&cluster_lock[i]);
> > @@ -574,7 +591,7 @@ int bL_cpufreq_register(struct cpufreq_arm_bL_ops *ops)
> > __func__, ops->name, ret);
> > arm_bL_ops = NULL;
> > } else {
> > - ret = bL_switcher_register_notifier(&bL_switcher_notifier);
> > + ret = __bLs_register_notifier();
> > if (ret) {
> > cpufreq_unregister_driver(&bL_cpufreq_driver);
> > arm_bL_ops = NULL;
> > @@ -598,7 +615,7 @@ void bL_cpufreq_unregister(struct cpufreq_arm_bL_ops *ops)
> > }
> >
> > bL_switcher_get_enabled();
> > - bL_switcher_unregister_notifier(&bL_switcher_notifier);
> > + __bLs_unregister_notifier();
> > cpufreq_unregister_driver(&bL_cpufreq_driver);
> > bL_switcher_put_enabled();
> > pr_info("%s: Un-registered platform driver: %s\n", __func__,
>
> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
Queued up for 4.2, thanks!
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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