mirror of
https://github.com/ibm-s390-linux/s390-tools.git
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5333085c55
The function is no longer required since the removal of the PHYSDEVPATH
entry in /sys/block/%s/uevent with commit 39aba963d937 ("driver core:
remove CONFIG_SYSFS_DEPRECATED_V2 but keep it for block devices") in
2010.
Signed-off-by: Jan Polensky <japo@linux.ibm.com>
Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
/*
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* ipl_tools - Linux for System z reipl and shutdown tools
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*
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* CCW device functions
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*
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* Copyright IBM Corp. 2008, 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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "lib/util_path.h"
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#include "lib/util_panic.h"
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#include "ipl_tools.h"
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/*
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* Look up for the device in /sys/devices/ hierarchy.
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*
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* path must be PATH_MAX large and the value will be replaced in place
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*/
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static int device_sysfs_path(const char *device, char *path, const size_t path_size)
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{
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util_assert(device != NULL, "Internal error: device is NULL");
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util_assert(path != NULL, "Internal error: path is NULL");
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util_assert(path_size == PATH_MAX, "Internal error: path_size is '%zu', but must be '%zu'",
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path_size, PATH_MAX);
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char *buf = util_path_sysfs("block/%s/device", device);
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if (!realpath(buf, path)) {
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free(buf);
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return -1;
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}
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free(buf);
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return 0;
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}
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/*
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* Check if the specified device number is a valid device number
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* which can be found in the /sys/bus/ccw/drivers/dasd-eckd/
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* structure.
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*
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* This does not work when booting from tape.
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*/
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int ccw_is_device(const char *busid)
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{
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char path[PATH_MAX];
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snprintf(path, sizeof(path),
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"/sys/bus/ccw/drivers/dasd-eckd/%s", busid);
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if (access(path, R_OK) == 0)
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return 1;
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snprintf(path, sizeof(path),
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"/sys/bus/ccw/drivers/virtio_ccw/%s", busid);
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if (access(path, R_OK) == 0)
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return 1;
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snprintf(path, sizeof(path), "/sys/bus/ccw/drivers/dasd-fba/%s", busid);
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if (access(path, R_OK) == 0)
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return 1;
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return 0;
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}
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/*
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* Check if the specified device is a valid virtio subchannel device
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*/
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int ccw_is_virtio_device(const char *device)
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{
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char path[PATH_MAX] = { '\0' };
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unsigned virtio = 0;
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if (device_sysfs_path(device, path, sizeof(path)) != 0)
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return -1;
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/*
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* The output has the following format:
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* /sys/devices/css0/0.0.0000/0.0.0000/virtio0/block/vda
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*/
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if (sscanf(path, "/sys/devices/css0/%*[0-9a-f.]/%*[0-9a-f.]/virtio%u", &virtio) != 1)
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return -1;
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return 0;
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}
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/*
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* Return CCW Bus ID
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*/
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void ccw_busid_get(const char *device, char *busid)
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{
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char path[PATH_MAX] = { '\0' };
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if (device_sysfs_path(device, path, sizeof(path)) != 0)
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ERR_EXIT("Could not lookup device number for \"%s\"", device);
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/*
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* The output has the following format:
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* /sys/devices/css0/0.0.0119/0.0.3f19/block/dasda
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* /sys/devices/css0/0.0.0000/0.0.0000/virtio0/block/vda
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*/
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if (sscanf(path, "/sys/devices/css0/%*[0-9a-f.]/%[0-9a-f.]", busid) != 1)
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ERR_EXIT("Could not lookup device number for \"%s\"", device);
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return;
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}
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