mirror of
https://github.com/ibm-s390-linux/s390-tools.git
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b627b8d8e1
This commit is based on the s390-tools-1.39.0 version. Changes on top of s390-tools-1.39.0: - Add MIT license to all source files - Add LICENSE file - Transform REAMDE to README.md (markdown) - Add AUTHORS.md file - Add CONTRIBUTING.md file - Move changelog from README to CHANGELOG.md file Reviewed-by: Stefan Haberland <sth@linux.vnet.ibm.com> Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
144 lines
2.8 KiB
C
144 lines
2.8 KiB
C
/*
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* dasd - Library for DASD related functions
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*
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* DASD related helper functions for accessing device information via sysfs
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*
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* Copyright IBM Corp. 2016, 2017
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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 <stdlib.h>
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#include "lib/dasd_sys.h"
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/**
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* Get raw-track access mode status
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*
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* The "devnode" parameter can be any valid relative or absolute path to
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* a DASD device node, for example:
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*
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* - /dev/dasda
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* - /dev/disk/by-path/ccw-0.0.bf20
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*
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* @param[in] devnode Device node of interest
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*
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* @retval 1 Raw-track access mode is enabled
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* @retval 0 Raw-track access mode is disabled or
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* cannot be determined
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*/
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int dasd_sys_raw_track_access(char *devnode)
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{
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char busid[9];
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char path[47];
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FILE *fp;
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int rc;
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if (u2s_getbusid(devnode, busid))
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return 0;
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sprintf(path, "/sys/bus/ccw/devices/%s/raw_track_access", busid);
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fp = fopen(path, "r");
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if (!fp)
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return 0;
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rc = fgetc(fp) - '0';
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fclose(fp);
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return (rc == 1) ? 1 : 0;
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}
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int dasd_get_pm_from_chpid(char *busid, unsigned int chpid, int *mask)
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{
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unsigned int val;
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char path[40];
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int count, i;
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FILE *fp;
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sprintf(path, "/sys/bus/ccw/devices/%s/../chpids", busid);
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*mask = 0;
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fp = fopen(path, "r");
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if (!fp)
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return ENODEV;
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for (i = 0; i < 8; i++) {
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count = fscanf(fp, " %x", &val);
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if (count != 1) {
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fclose(fp);
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return EIO;
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}
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if (val == chpid)
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*mask = 0x80 >> i;
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}
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fclose(fp);
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return 0;
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}
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/**
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* reset chpid
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*
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* The "devnode" parameter can be any valid relative or absolute path to
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* a DASD device node, for example:
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*
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* - /dev/dasda
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* - /dev/disk/by-path/ccw-0.0.bf20
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*
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* @param[in] devnode Device node of interest
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* @param[in] chpid The chpid to reset
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* If NULL all chpids will be reset
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*
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* @return 0 on success, otherwise one of the following error codes:
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* - EINVAL No valid chpid specified.
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* - ENODEV Could not open device.
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* - ENOENT Specified chpid not found.
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* - EIO Other I/O error
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*
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*/
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int dasd_reset_chpid(char *devnode, char *chpid_char)
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{
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unsigned int chpid;
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char path[41];
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char busid[9];
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int mask, rc;
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char *endptr;
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FILE *fp;
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if (u2s_getbusid(devnode, busid))
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return ENODEV;
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if (!chpid_char) {
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sprintf(path, "/sys/bus/ccw/devices/%s/path_reset", busid);
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fp = fopen(path, "w");
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if (!fp)
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return ENODEV;
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fprintf(fp, "%s", "all\n");
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fclose(fp);
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return 0;
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}
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errno = 0;
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chpid = strtoul(chpid_char, &endptr, 16);
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if (errno || (endptr && (*endptr != '\0')))
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return EINVAL;
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rc = dasd_get_pm_from_chpid(busid, chpid, &mask);
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if (rc)
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return rc;
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if (!mask)
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return ENOENT;
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sprintf(path, "/sys/bus/ccw/devices/%s/path_reset", busid);
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fp = fopen(path, "w");
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if (!fp)
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return ENODEV;
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fprintf(fp, "%02x", mask);
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fclose(fp);
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return 0;
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}
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