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c7fe21b019
Add a function to detect the existence of the CPU Measurement Sampling Facility on a system. Add a function which extracts the CPU Measurement Sampling Facility characteristics on a system, such as - minimum sample speed - maximum sample speed - current CPU speed - basic sample size in bytes - diagnostic sample size in bytes Add a function to detect the existence of the CPU Measurement Sampling Facility on a system and return the current sampling buffer management characteristics, such as: - minimum supported sampling buffer size - maximum supported sampling buffer size Add a function to detect the existence of the CPU Measurement Counting Facility on a system. Add a function which extracts the CPU Measurement Counting Facility characteristics on a system, such as - counter first version number - counter second version number - counter set authorization level Add a function the returm the PMU type number of a CPU Measurement Facility device driver. These numbers may vary between boots. Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Acked-by: Sumanth Korikkar <sumanthk@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
34 lines
716 B
C
34 lines
716 B
C
/* Copyright IBM Corp. 2022
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*
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* s390-tools is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "lib/libcpumf.h"
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int libcpumf_pmutype(const char *dirname)
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{
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FILE *file;
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char *fn;
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int ret;
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ret = asprintf(&fn, "%s/type", dirname);
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if (ret == -1) /* No memory, errno set */
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return ret;
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file = fopen(fn, "r");
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free(fn);
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ret = -1; /* Errno set on file open error */
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if (file) {
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/* Read out a single number from that file */
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if (fscanf(file, "%u", &ret) != 1)
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/* Unexpected format error, set errno */
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errno = -ERANGE;
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fclose(file);
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}
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return ret;
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}
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