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Date: Fri, 16 Feb 2018 13:55:43 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Thomas Richter <tmricht@...ux.vnet.ibm.com>
Cc: linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
brueckner@...ux.vnet.ibm.com, schwidefsky@...ibm.com,
heiko.carstens@...ibm.com
Subject: Re: [PATCH 1/4] perf record: Provide detailed information on s390 CPU
Em Tue, Feb 13, 2018 at 04:14:16PM +0100, Thomas Richter escreveu:
> When perf record ... is setup to record data, the s390
> cpu information was a fixed string "IBM/S390".
>
> Replace this string with one containing more information
> about the machine. The information included in the cpuid is
> a comma separated list:
> manufacturer,type,model-capacity,model[,version,authorization]
> with
>
> - manufacturer: up to 16 byte name of the manufacturer (IBM).
> - type: a four digit number refering to the machine
> generation.
> - model-capacitiy: up to 16 characters describing number
> of cpus etc.
> - model: up to 16 characters describing model.
> - version: the CPU-MF counter facility version number,
> available on LPARs only, omitted on z/VM guests.
> - authorization: the CPU-MF counter facility authorization level,
> available on LPARs only, omitted on z/VM guests.
>
> Before:
> [root@...60047 perf]# ./perf record -- sleep 1
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.001 MB perf.data (4 samples) ]
> [root@...60047 perf]# ./perf report --header | fgrep cpuid
> # cpuid : IBM/S390
> [root@...60047 perf]#
49 38.13 ubuntu:16.04-x-s390 : FAIL s390x-linux-gnu-gcc (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609
Humm, this seems to be the one causing this:
LINK /tmp/build/perf/plugin_hrtimer.so
LINK /tmp/build/perf/plugin_kmem.so
In file included from /usr/s390x-linux-gnu/include/string.h:635:0,
from arch/s390/util/header.c:16:
In function 'strncat',
inlined from 'get_cpuid' at arch/s390/util/header.c:65:5:
/usr/s390x-linux-gnu/include/bits/string3.h:156:10: error: call to __builtin___strncat_chk might overflow destination buffer [-Werror]
return __builtin___strncat_chk (__dest, __src, __len, __bos (__dest));
^
In function 'strncat',
inlined from 'get_cpuid' at arch/s390/util/header.c:72:5:
/usr/s390x-linux-gnu/include/bits/string3.h:156:10: error: call to __builtin___strncat_chk might overflow destination buffer [-Werror]
return __builtin___strncat_chk (__dest, __src, __len, __bos (__dest));
^
In function 'strncat',
inlined from 'get_cpuid' at arch/s390/util/header.c:111:5:
/usr/s390x-linux-gnu/include/bits/string3.h:156:10: error: call to __builtin___strncat_chk might overflow destination buffer [-Werror]
return __builtin___strncat_chk (__dest, __src, __len, __bos (__dest));
^
In function 'strncat',
inlined from 'get_cpuid' at arch/s390/util/header.c:117:5:
/usr/s390x-linux-gnu/include/bits/string3.h:156:10: error: call to __builtin___strncat_chk might overflow destination buffer [-Werror]
return __builtin___strncat_chk (__dest, __src, __len, __bos (__dest));
^
LINK /tmp/build/perf/plugin_kvm.so
MKDIR /tmp/build/perf/arch/s390/util/
LINK /tmp/build/perf/plugin_mac80211.so
CC /tmp/build/perf/arch/s390/util/kvm-stat.o
LINK /tmp/build/perf/plugin_sched_switch.so
cc1: all warnings being treated as errors
mv: cannot stat '/tmp/build/perf/arch/s390/util/.header.o.tmp': No such file or directory
/git/linux/tools/build/Makefile.build:96: recipe for target '/tmp/build/perf/arch/s390/util/header.o' failed
make[6]: *** [/tmp/build/perf/arch/s390/util/header.o] Error 1
make[6]: *** Waiting for unfinished jobs....
LINK /tmp/build/perf/plugin_function.so
> After:
> [root@...lp76 perf]# ./perf report --header|fgrep cpuid
> # cpuid : IBM,3906,704,M03,3.5,002f
> [root@...lp76 perf]#
>
> Signed-off-by: Thomas Richter <tmricht@...ux.vnet.ibm.com>
> Reviewed-by: Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>
> ---
> tools/perf/arch/s390/util/header.c | 126 +++++++++++++++++++++++++++++++++++--
> 1 file changed, 121 insertions(+), 5 deletions(-)
>
> diff --git a/tools/perf/arch/s390/util/header.c b/tools/perf/arch/s390/util/header.c
> index 9fa6c3e5782c..3d29ba47edce 100644
> --- a/tools/perf/arch/s390/util/header.c
> +++ b/tools/perf/arch/s390/util/header.c
> @@ -1,8 +1,9 @@
> /*
> * Implementation of get_cpuid().
> *
> - * Copyright 2014 IBM Corp.
> + * Copyright IBM Corp. 2014, 2018
> * Author(s): Alexander Yarygin <yarygin@...ux.vnet.ibm.com>
> + * Thomas Richter <tmricht@...ux.vnet.ibm.com>
> *
> * This program is free software; you can redistribute it and/or modify
> * it under the terms of the GNU General Public License (version 2 only)
> @@ -13,16 +14,131 @@
> #include <unistd.h>
> #include <stdio.h>
> #include <string.h>
> +#include <ctype.h>
>
> #include "../../util/header.h"
> +#include "../../util/util.h"
> +
> +#define SYSINFO_MANU "Manufacturer:"
> +#define SYSINFO_TYPE "Type:"
> +#define SYSINFO_MODEL "Model:"
> +#define SRVLVL_CPUMF "CPU-MF:"
> +#define SRVLVL_VERSION "version="
> +#define SRVLVL_AUTHORIZATION "authorization="
> +#define SYSINFO "/proc/sysinfo"
> +#define SRVLVL "/proc/service_levels"
>
> int get_cpuid(char *buffer, size_t sz)
> {
> - const char *cpuid = "IBM/S390";
> + char *cp, *line = NULL, *line2;
> + char type[8], model[33], version[8], manufacturer[32], authorization[8];
> + int read;
> + unsigned long line_sz;
> + size_t nbytes;
> + FILE *sysinfo;
> +
> + /*
> + * Scan /proc/sysinfo line by line and read out values for
> + * Manufacturer:, Type: and Model:, for example:
> + * Manufacturer: IBM
> + * Type: 2964
> + * Model: 702 N96
> + * The first word is the Model Capacity and the second word is
> + * Model (can be omitted). Both words have a maximum size of 16
> + * bytes.
> + */
> + memset(manufacturer, 0, sizeof(manufacturer));
> + memset(type, 0, sizeof(type));
> + memset(model, 0, sizeof(model));
> + memset(version, 0, sizeof(version));
> + memset(authorization, 0, sizeof(authorization));
> +
> + sysinfo = fopen(SYSINFO, "r");
> + if (sysinfo == NULL)
> + return -1;
> +
> + while ((read = getline(&line, &line_sz, sysinfo)) != -1) {
> + if (!strncmp(line, SYSINFO_MANU, strlen(SYSINFO_MANU))) {
> + line2 = line + strlen(SYSINFO_MANU);
> +
> + while ((cp = strtok_r(line2, "\n ", &line2)))
> + strncat(manufacturer, cp, sizeof(manufacturer));
> + }
> +
> + if (!strncmp(line, SYSINFO_TYPE, strlen(SYSINFO_TYPE))) {
> + line2 = line + strlen(SYSINFO_TYPE);
> +
> + while ((cp = strtok_r(line2, "\n ", &line2)))
> + strncat(type, cp, sizeof(type));
> + }
> +
> + if (!strncmp(line, SYSINFO_MODEL, strlen(SYSINFO_MODEL))) {
> + line2 = line + strlen(SYSINFO_MODEL);
> +
> + while ((cp = strtok_r(line2, "\n ", &line2))) {
> + if (model[0])
> + strcat(model, ",");
> + if (strlen(model) + strlen(cp) < sizeof(model))
> + strncat(model, cp, strlen(cp));
> + }
> + break;
> + }
> + }
> + fclose(sysinfo);
>
> - if (strlen(cpuid) + 1 > sz)
> + /* Missing manufacturer, type or model information should not happen */
> + if (!manufacturer[0] || !type[0] || !model[0])
> return -1;
>
> - strcpy(buffer, cpuid);
> - return 0;
> + /*
> + * Scan /proc/service_levels and return the CPU-MF counter facility
> + * version number and authorization level.
> + * Optional, does not exist on z/VM guests.
> + */
> + sysinfo = fopen(SRVLVL, "r");
> + if (sysinfo == NULL)
> + goto skip_sysinfo;
> + while ((read = getline(&line, &line_sz, sysinfo)) != -1) {
> + if (strncmp(line, SRVLVL_CPUMF, strlen(SRVLVL_CPUMF)))
> + continue;
> +
> + line2 = line + strlen(SRVLVL_CPUMF);
> + while ((cp = strtok_r(line2, "\n ", &line2))) {
> + if (!strncmp(cp, SRVLVL_VERSION,
> + strlen(SRVLVL_VERSION))) {
> + char *sep = strchr(cp, '=');
> +
> + strncat(version, sep + 1, sizeof(version));
> + }
> + if (!strncmp(cp, SRVLVL_AUTHORIZATION,
> + strlen(SRVLVL_AUTHORIZATION))) {
> + char *sep = strchr(cp, '=');
> +
> + strncat(authorization, sep + 1,
> + sizeof(authorization));
> + }
> + }
> + }
> + fclose(sysinfo);
> +
> +skip_sysinfo:
> + free(line);
> +
> + if (version[0] && authorization[0] )
> + nbytes = snprintf(buffer, sz, "%s,%s,%s,%s,%s",
> + manufacturer, type, model, version,
> + authorization);
> + else
> + nbytes = snprintf(buffer, sz, "%s,%s,%s", manufacturer, type,
> + model);
> + return (nbytes >= sz) ? -1 : 0;
> +}
> +
> +char *get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
> +{
> + char *buf = malloc(128);
> +
> + if (buf && get_cpuid(buf, 128) < 0)
> + zfree(&buf);
> + return buf;
> }
> --
> 2.14.3
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