From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jiri Olsa <jolsa@redhat.com>
Subject: Re: [PATCH v3 6/8] perf/tools: Enhance JSON/metric infrastructure to
 handle "?"
Date: Mon, 2 Mar 2020 16:08:19 +0100
Message-ID: <20200302150819.GA259142@krava>
References: <20200229094159.25573-1-kjain@linux.ibm.com>
 <20200229094159.25573-7-kjain@linux.ibm.com>
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To: Kajol Jain <kjain@linux.ibm.com>
Cc: acme@kernel.org, linuxppc-dev@lists.ozlabs.org, mpe@ellerman.id.au, sukadev@linux.vnet.ibm.com, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, anju@linux.vnet.ibm.com, maddy@linux.vnet.ibm.com, ravi.bangoria@linux.ibm.com, peterz@infradead.org, yao.jin@linux.intel.com, ak@linux.intel.com, jolsa@kernel.org, kan.liang@linux.intel.com, jmario@redhat.com, alexander.shishkin@linux.intel.com, mingo@kernel.org, paulus@ozlabs.org, namhyung@kernel.org, mpetlan@redhat.com, gregkh@linuxfoundation.org, benh@kernel.crashing.org, mamatha4@linux.vnet.ibm.com, mark.rutland@arm.com, tglx@linutronix.de
List-Id: linux-perf-users.vger.kernel.org

On Sat, Feb 29, 2020 at 03:11:57PM +0530, Kajol Jain wrote:

SNIP

>  #define PVR_VER(pvr)    (((pvr) >>  16) & 0xFFFF) /* Version field */
>  #define PVR_REV(pvr)    (((pvr) >>   0) & 0xFFFF) /* Revison field */
>  
> +#define SOCKETS_INFO_FILE_PATH "/devices/hv_24x7/interface/"
> +
>  int
>  get_cpuid(char *buffer, size_t sz)
>  {
> @@ -44,3 +51,43 @@ get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
>  
>  	return bufp;
>  }
> +
> +int arch_get_runtimeparam(void)
> +{
> +	int count = 0;
> +	DIR *dir;
> +	char path[PATH_MAX];
> +	const char *sysfs = sysfs__mountpoint();
> +	char filename[] = "sockets";
> +	FILE *file;
> +	char buf[16], *num;
> +	int data;
> +
> +	if (!sysfs)
> +		goto out;
> +
> +	snprintf(path, PATH_MAX,
> +		 "%s" SOCKETS_INFO_FILE_PATH, sysfs);
> +	dir = opendir(path);
> +
> +	if (!dir)
> +		goto out;
> +
> +	strcat(path, filename);
> +	file = fopen(path, "r");
> +
> +	if (!file)
> +		goto out;
> +
> +	data = fread(buf, 1, sizeof(buf), file);
> +
> +	if (data == 0)
> +		goto out;
> +
> +	count = strtol(buf, &num, 10);
> +out:
> +	if (!count)
> +		count = 1;
> +
> +	return count;

we have sysfs__read_ull for this

jirka