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Wysocki" , Viresh Kumar , Shuah Khan , Borislav Petkov , Peter Zijlstra , Ingo Molnar , Giovanni Gherdovich , linux-pm@vger.kernel.org Cc: Deepak Sharma , Alex Deucher , Mario Limonciello , Steven Noonan , Nathan Fontenot , Jinzhou Su , Xiaojian Du , linux-kernel@vger.kernel.org, x86@kernel.org References: <20211119103102.88124-1-ray.huang@amd.com> <20211119103102.88124-17-ray.huang@amd.com> From: Nathan Fontenot Message-ID: <152fb29e-c558-ec2f-7ec6-65d7f62274b7@amd.com> Date: Fri, 19 Nov 2021 14:38:58 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 In-Reply-To: <20211119103102.88124-17-ray.huang@amd.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BL0PR03CA0027.namprd03.prod.outlook.com (2603:10b6:208:2d::40) To SN6PR12MB4720.namprd12.prod.outlook.com (2603:10b6:805:e6::31) MIME-Version: 1.0 Received: from [IPv6:2600:1700:271:b60:561b:7197:b7b5:aaae] (2600:1700:271:b60:561b:7197:b7b5:aaae) by BL0PR03CA0027.namprd03.prod.outlook.com (2603:10b6:208:2d::40) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4713.19 via Frontend Transport; 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> > - > -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 size) > { > unsigned long value; > unsigned int len; > char linebuf[MAX_LINE_LEN]; > char *endp; > > - if (which >= MAX_CPUFREQ_VALUE_READ_FILES) > + if (!table && !table[index] && index >= size) Should you validate the index before accessing table[index] if (!table && index >= size && !table[index]) -Nathan > 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 size); > + > #ifdef __cplusplus > } > #endif >