linux-kernel - Re: [PATCH RESEND v6 4/9] cpupower: Add the function to get the sysfs value from specific table

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Date:   Sun, 20 Feb 2022 22:22:57 +0800
From:   Huang Rui <ray.huang@....com>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "Sharma, Deepak" <Deepak.Sharma@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Limonciello, Mario" <Mario.Limonciello@....com>,
        Steven Noonan <steven@...vesoftware.com>,
        "Fontenot, Nathan" <Nathan.Fontenot@....com>,
        "Su, Jinzhou (Joe)" <Jinzhou.Su@....com>,
        "Du, Xiaojian" <Xiaojian.Du@....com>,
        "Yuan, Perry" <Perry.Yuan@....com>,
        "Meng, Li (Jassmine)" <Li.Meng@....com>,
        Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Giovanni Gherdovich <ggherdovich@...e.cz>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND v6 4/9] cpupower: Add the function to get the
 sysfs value from specific table

On Sat, Feb 19, 2022 at 07:46:46AM +0800, Shuah Khan wrote:
> On 2/16/22 12:35 AM, Huang Rui wrote:
> > Expose the helper into cpufreq header, then cpufreq driver can use this
> > function to get the sysfs value if it has any specific sysfs interfaces.
> > 
> > Signed-off-by: Huang Rui <ray.huang@....com>
> > ---
> >   tools/power/cpupower/lib/cpufreq.c | 21 +++++++++++++++------
> >   tools/power/cpupower/lib/cpufreq.h | 12 ++++++++++++
> >   2 files changed, 27 insertions(+), 6 deletions(-)
> > 
> > diff --git a/tools/power/cpupower/lib/cpufreq.c b/tools/power/cpupower/lib/cpufreq.c
> > index c3b56db8b921..c011bca27041 100644
> > --- a/tools/power/cpupower/lib/cpufreq.c
> > +++ b/tools/power/cpupower/lib/cpufreq.c
> > @@ -83,20 +83,21 @@ static const char *cpufreq_value_files[MAX_CPUFREQ_VALUE_READ_FILES] = {
> >   	[STATS_NUM_TRANSITIONS] = "stats/total_trans"
> >   };
> >   
> > -
> > -static unsigned long sysfs_cpufreq_get_one_value(unsigned int cpu,
> > -						 enum cpufreq_value which)
> > +unsigned long cpufreq_get_sysfs_value_from_table(unsigned int cpu,
> > +						 const char **table,
> > +						 unsigned index,
> 
> unsigned int
> 
> > +						 unsigned size)
> 
> unsigned int
> 
> >   {
> >   	unsigned long value;
> >   	unsigned int len;
> >   	char linebuf[MAX_LINE_LEN];
> >   	char *endp;
> >   
> > -	if (which >= MAX_CPUFREQ_VALUE_READ_FILES)
> > +	if (!table || index >= size || !table[index])
> >   		return 0;
> >   
> > -	len = sysfs_cpufreq_read_file(cpu, cpufreq_value_files[which],
> > -				linebuf, sizeof(linebuf));
> > +	len = sysfs_cpufreq_read_file(cpu, table[index], linebuf,
> > +				      sizeof(linebuf));
> >   
> >   	if (len == 0)
> >   		return 0;
> > @@ -109,6 +110,14 @@ static unsigned long sysfs_cpufreq_get_one_value(unsigned int cpu,
> >   	return value;
> >   }
> >   
> > +static unsigned long sysfs_cpufreq_get_one_value(unsigned int cpu,
> > +						 enum cpufreq_value which)
> > +{
> > +	return cpufreq_get_sysfs_value_from_table(cpu, cpufreq_value_files,
> > +						  which,
> > +						  MAX_CPUFREQ_VALUE_READ_FILES);
> > +}
> > +
> >   /* read access to files which contain one string */
> >   
> >   enum cpufreq_string {
> > diff --git a/tools/power/cpupower/lib/cpufreq.h b/tools/power/cpupower/lib/cpufreq.h
> > index 95f4fd9e2656..107668c0c454 100644
> > --- a/tools/power/cpupower/lib/cpufreq.h
> > +++ b/tools/power/cpupower/lib/cpufreq.h
> > @@ -203,6 +203,18 @@ int cpufreq_modify_policy_governor(unsigned int cpu, char *governor);
> >   int cpufreq_set_frequency(unsigned int cpu,
> >   				unsigned long target_frequency);
> >   
> > +/*
> > + * get the sysfs value from specific table
> > + *
> > + * Read the value with the sysfs file name from specific table. Does
> > + * only work if the cpufreq driver has the specific sysfs interfaces.
> > + */
> > +
> > +unsigned long cpufreq_get_sysfs_value_from_table(unsigned int cpu,
> > +						 const char **table,
> > +						 unsigned index,
> 
> unsigned int?
> 
> > +						 unsigned size);
> 
> unsigned int?
> 

OK, the complier prefer 'unsigned int' to bare use of 'unsigned'. Thanks, I
will updated it in V7.

Thanks,
Ray