From: Saravana Kannan <skannan@codeaurora.org>
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Linux PM list <linux-pm@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Viresh Kumar <viresh.kumar@linaro.org>,
Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
Juri Lelli <juri.lelli@arm.com>,
Steve Muckle <steve.muckle@linaro.org>
Subject: Re: [PATCH 2/11] cpufreq: governor: Use common mutex for dbs_data protection
Date: Wed, 03 Feb 2016 16:59:38 -0800 [thread overview]
Message-ID: <56B2A27A.5030303@codeaurora.org> (raw)
In-Reply-To: <1529283.0IedZktI9q@vostro.rjw.lan>
On 02/03/2016 03:16 PM, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>
> Every governor relying on the common code in cpufreq_governor.c
> has to provide its own mutex in struct common_dbs_data. However,
> those mutexes are never used at the same time and doing it this
> way makes it rather difficult to follow the code. Moreover,
> if two governor modules are loaded we end up with two mutexes
> used for the same purpose one at a time.
>
> Introduce a single common mutex for that instead and drop the
> mutex field from struct common_dbs_data. That at least will
> ensure that the mutex is always present and initialized regardless
> of what the particular governors do.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> ---
> drivers/cpufreq/cpufreq_conservative.c | 1 -
> drivers/cpufreq/cpufreq_governor.c | 7 +++++--
> drivers/cpufreq/cpufreq_governor.h | 6 +-----
> drivers/cpufreq/cpufreq_ondemand.c | 5 ++---
> 4 files changed, 8 insertions(+), 11 deletions(-)
>
> Index: linux-pm/drivers/cpufreq/cpufreq_governor.c
> ===================================================================
> --- linux-pm.orig/drivers/cpufreq/cpufreq_governor.c
> +++ linux-pm/drivers/cpufreq/cpufreq_governor.c
> @@ -22,6 +22,9 @@
>
> #include "cpufreq_governor.h"
>
> +DEFINE_MUTEX(dbs_data_mutex);
> +EXPORT_SYMBOL_GPL(dbs_data_mutex);
> +
> static struct attribute_group *get_sysfs_attr(struct dbs_data *dbs_data)
> {
> if (have_governor_per_policy())
> @@ -542,7 +545,7 @@ int cpufreq_governor_dbs(struct cpufreq_
> int ret;
>
> /* Lock governor to block concurrent initialization of governor */
> - mutex_lock(&cdata->mutex);
> + mutex_lock(&dbs_data_mutex);
>
> if (have_governor_per_policy())
> dbs_data = policy->governor_data;
> @@ -575,7 +578,7 @@ int cpufreq_governor_dbs(struct cpufreq_
> }
>
> unlock:
> - mutex_unlock(&cdata->mutex);
> + mutex_unlock(&dbs_data_mutex);
>
> return ret;
> }
> Index: linux-pm/drivers/cpufreq/cpufreq_governor.h
> ===================================================================
> --- linux-pm.orig/drivers/cpufreq/cpufreq_governor.h
> +++ linux-pm/drivers/cpufreq/cpufreq_governor.h
> @@ -223,11 +223,6 @@ struct common_dbs_data {
>
> /* Governor specific ops, see below */
> void *gov_ops;
> -
> - /*
> - * Protects governor's data (struct dbs_data and struct common_dbs_data)
> - */
> - struct mutex mutex;
> };
>
> /* Governor Per policy data */
> @@ -272,6 +267,7 @@ static ssize_t show_sampling_rate_min_go
> return sprintf(buf, "%u\n", dbs_data->min_sampling_rate); \
> }
>
> +extern struct mutex dbs_data_mutex;
> extern struct mutex cpufreq_governor_lock;
> void gov_set_update_util(struct cpu_common_dbs_info *shared,
> unsigned int delay_us);
> Index: linux-pm/drivers/cpufreq/cpufreq_ondemand.c
> ===================================================================
> --- linux-pm.orig/drivers/cpufreq/cpufreq_ondemand.c
> +++ linux-pm/drivers/cpufreq/cpufreq_ondemand.c
> @@ -251,7 +251,7 @@ static void update_sampling_rate(struct
> /*
> * Lock governor so that governor start/stop can't execute in parallel.
> */
> - mutex_lock(&od_dbs_cdata.mutex);
> + mutex_lock(&dbs_data_mutex);
>
> cpumask_copy(&cpumask, cpu_online_mask);
>
> @@ -304,7 +304,7 @@ static void update_sampling_rate(struct
> }
> }
>
> - mutex_unlock(&od_dbs_cdata.mutex);
> + mutex_unlock(&dbs_data_mutex);
> }
>
> static ssize_t store_sampling_rate(struct dbs_data *dbs_data, const char *buf,
> @@ -550,7 +550,6 @@ static struct common_dbs_data od_dbs_cda
> .gov_ops = &od_ops,
> .init = od_init,
> .exit = od_exit,
> - .mutex = __MUTEX_INITIALIZER(od_dbs_cdata.mutex),
> };
>
> static int od_cpufreq_governor_dbs(struct cpufreq_policy *policy,
> Index: linux-pm/drivers/cpufreq/cpufreq_conservative.c
> ===================================================================
> --- linux-pm.orig/drivers/cpufreq/cpufreq_conservative.c
> +++ linux-pm/drivers/cpufreq/cpufreq_conservative.c
> @@ -368,7 +368,6 @@ static struct common_dbs_data cs_dbs_cda
> .gov_check_cpu = cs_check_cpu,
> .init = cs_init,
> .exit = cs_exit,
> - .mutex = __MUTEX_INITIALIZER(cs_dbs_cdata.mutex),
> };
>
> static int cs_cpufreq_governor_dbs(struct cpufreq_policy *policy,
>
> --
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> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
Acked-by: Saravana Kannan <skannan@codeaurora.org>
--
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2016-02-04 0:59 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-03 23:12 [PATCH 0/11] cpufreq: governor: ondemand/conservative data structures rework Rafael J. Wysocki
2016-02-03 23:14 ` [PATCH 1/11] cpufreq: Clean up default and fallback governor setup Rafael J. Wysocki
2016-02-04 0:55 ` Saravana Kannan
2016-02-04 5:03 ` Viresh Kumar
2016-02-03 23:16 ` [PATCH 2/11] cpufreq: governor: Use common mutex for dbs_data protection Rafael J. Wysocki
2016-02-04 0:59 ` Saravana Kannan [this message]
2016-02-04 5:09 ` Viresh Kumar
2016-02-04 16:46 ` Rafael J. Wysocki
2016-02-05 2:59 ` Viresh Kumar
2016-02-05 3:06 ` Rafael J. Wysocki
2016-02-05 3:15 ` Rafael J. Wysocki
2016-02-05 3:17 ` Rafael J. Wysocki
2016-02-05 3:24 ` Viresh Kumar
2016-02-05 3:33 ` Rafael J. Wysocki
2016-02-05 3:22 ` Viresh Kumar
2016-02-03 23:22 ` [PATCH 3/11] cpufreq: governor: Use common global_dbs_data pointer Rafael J. Wysocki
2016-02-04 1:11 ` Saravana Kannan
2016-02-04 1:25 ` Rafael J. Wysocki
2016-02-04 1:40 ` Saravana Kannan
2016-02-04 5:38 ` Viresh Kumar
2016-02-04 1:47 ` Saravana Kannan
2016-02-04 5:36 ` Viresh Kumar
[not found] ` <CAHZ_5WxJSDtFyFdCc-D2=HSaPON=3rzUxpxPYsCyZvrV1Nv3qw@mail.gmail.com>
2016-02-04 8:25 ` Viresh Kumar
2016-02-04 11:31 ` Gautham R Shenoy
2016-02-04 11:35 ` Viresh Kumar
2016-02-04 16:52 ` Rafael J. Wysocki
2016-02-05 3:02 ` Viresh Kumar
2016-02-05 3:10 ` Rafael J. Wysocki
2016-02-03 23:29 ` [PATCH 4/11] cpufreq: governor: Avoid passing dbs_data pointers around unnecessarily Rafael J. Wysocki
2016-02-04 1:37 ` Saravana Kannan
2016-02-03 23:31 ` [PATCH 5/11] cpufreq: governor: Put governor structure into common_dbs_data Rafael J. Wysocki
2016-02-04 1:57 ` Saravana Kannan
2016-02-03 23:32 ` [PATCH 6/11] cpufreq: governor: Rename some data types and variables Rafael J. Wysocki
2016-02-03 23:33 ` [PATCH 7/11] cpufreq: governor: Rework cpufreq_governor_dbs() Rafael J. Wysocki
2016-02-04 2:03 ` Saravana Kannan
2016-02-03 23:35 ` [PATCH 8/11] cpufreq: governor: Drop the gov pointer from struct dbs_data Rafael J. Wysocki
2016-02-03 23:35 ` [PATCH 9/11] cpufreq: governor: Rename cpu_common_dbs_info to policy_dbs_info Rafael J. Wysocki
2016-02-03 23:37 ` [PATCH 10/11] cpufreq: governor: Rearrange governor data structures Rafael J. Wysocki
2016-02-03 23:38 ` [PATCH 11/11] cpufreq: governor: Drop cpu argument from dbs_check_cpu() Rafael J. Wysocki
2016-02-04 5:40 ` [PATCH 0/11] cpufreq: governor: ondemand/conservative data structures rework Viresh Kumar
2016-02-04 17:22 ` Rafael J. Wysocki
2016-02-05 2:07 ` [PATCH v2 0/10] " Rafael J. Wysocki
2016-02-05 2:11 ` [PATCH v2 1/10] cpufreq: Clean up default and fallback governor setup Rafael J. Wysocki
2016-02-10 5:15 ` Gautham R Shenoy
2016-02-10 5:48 ` Gautham R Shenoy
2016-02-05 2:14 ` [PATCH v2 2/10] cpufreq: governor: Use common mutex for dbs_data protection Rafael J. Wysocki
2016-02-05 6:53 ` Viresh Kumar
2016-02-05 22:59 ` Rafael J. Wysocki
2016-02-07 9:31 ` Viresh Kumar
2016-02-07 14:33 ` Rafael J. Wysocki
2016-02-05 2:15 ` [PATCH v2 3/10] cpufreq: governor: Avoid passing dbs_data pointers around unnecessarily Rafael J. Wysocki
2016-02-05 7:09 ` Viresh Kumar
2016-02-05 2:16 ` [PATCH v2 4/10] cpufreq: governor: Put governor structure into common_dbs_data Rafael J. Wysocki
2016-02-05 7:13 ` Viresh Kumar
2016-02-05 2:17 ` [PATCH v2 5/10] cpufreq: governor: Rename some data types and variables Rafael J. Wysocki
2016-02-05 7:17 ` Viresh Kumar
2016-02-05 2:18 ` [PATCH v2 6/10] cpufreq: governor: Rework cpufreq_governor_dbs() Rafael J. Wysocki
2016-02-05 8:14 ` Viresh Kumar
2016-02-05 2:19 ` [PATCH v2 7/10] cpufreq: governor: Drop the gov pointer from struct dbs_data Rafael J. Wysocki
2016-02-05 8:28 ` Viresh Kumar
2016-02-05 2:20 ` [PATCH v2 8/10] cpufreq: governor: Rename cpu_common_dbs_info to policy_dbs_info Rafael J. Wysocki
2016-02-05 8:34 ` Viresh Kumar
2016-02-05 22:50 ` Rafael J. Wysocki
2016-02-06 12:48 ` [PATCH v3 " Rafael J. Wysocki
2016-02-07 9:31 ` Viresh Kumar
2016-02-05 2:21 ` [PATCH v2 9/10] cpufreq: governor: Rearrange governor data structures Rafael J. Wysocki
2016-02-05 9:13 ` Viresh Kumar
2016-02-05 22:47 ` Rafael J. Wysocki
2016-02-07 9:29 ` Viresh Kumar
2016-02-07 14:34 ` Rafael J. Wysocki
2016-02-05 2:21 ` [PATCH v2 10/10] cpufreq: governor: Drop cpu argument from dbs_check_cpu() Rafael J. Wysocki
2016-02-05 9:15 ` Viresh Kumar
2016-02-06 12:50 ` [PATCH v3 " Rafael J. Wysocki
2016-02-07 9:32 ` Viresh Kumar
2016-02-06 12:44 ` [PATCH v2 0/10] cpufreq: governor: ondemand/conservative data structures rework Rafael J. Wysocki
2016-02-07 15:22 ` [PATCH 0/3] cpufreq: governor: Data structure rearrangement Rafael J. Wysocki
2016-02-07 15:23 ` [PATCH 1/3] cpufreq: governor: Simplify cpufreq_governor_limits() Rafael J. Wysocki
2016-02-07 15:40 ` Viresh Kumar
2016-02-08 0:59 ` Rafael J. Wysocki
2016-02-07 15:24 ` [PATCH 2/3] cpufreq: governor: Rearrange governor data structures Rafael J. Wysocki
2016-02-07 15:45 ` Viresh Kumar
2016-02-07 15:54 ` Viresh Kumar
2016-02-07 15:55 ` Viresh Kumar
2016-02-07 15:25 ` [PATCH 3/3] cpufreq: governor: Symmetrize cpu_dbs_info initialization and cleanup Rafael J. Wysocki
2016-02-07 15:52 ` Viresh Kumar
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