mirror of
https://github.com/ibm-s390-linux/s390-tools.git
synced 2026-08-05 02:14:52 +00:00
6f53d7d3cd
Optimize dependency management by reducing header inclusions. This reduces hidden dependencies, improves modularity, and enhances compilation performance. 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>
117 lines
2.8 KiB
C
117 lines
2.8 KiB
C
/*
|
|
* ipl_tools - Linux for System z reipl and shutdown tools
|
|
*
|
|
* CCW device functions
|
|
*
|
|
* Copyright IBM Corp. 2008, 2017
|
|
*
|
|
* s390-tools is free software; you can redistribute it and/or modify
|
|
* it under the terms of the MIT license. See LICENSE for details.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "lib/util_path.h"
|
|
#include "lib/util_panic.h"
|
|
#include "ipl_tools.h"
|
|
|
|
/*
|
|
* Look up for the device in /sys/devices/ hierarchy.
|
|
*
|
|
* path must be PATH_MAX large and the value will be replaced in place
|
|
*/
|
|
static int device_sysfs_path(const char *device, char *path, const size_t path_size)
|
|
{
|
|
util_assert(device != NULL, "Internal error: device is NULL");
|
|
util_assert(path != NULL, "Internal error: path is NULL");
|
|
util_assert(path_size == PATH_MAX, "Internal error: path_size is '%zu', but must be '%zu'",
|
|
path_size, PATH_MAX);
|
|
char *buf = util_path_sysfs("block/%s/device", device);
|
|
|
|
if (!realpath(buf, path)) {
|
|
free(buf);
|
|
return -1;
|
|
}
|
|
free(buf);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Check if the specified device number is a valid device number
|
|
* which can be found in the /sys/bus/ccw/drivers/dasd-eckd/
|
|
* structure.
|
|
*
|
|
* This does not work when booting from tape.
|
|
*/
|
|
int ccw_is_device(const char *busid)
|
|
{
|
|
static const char *const driver_paths[] = { "dasd-eckd", "virtio_ccw", "dasd-fba" };
|
|
char *path;
|
|
size_t i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(driver_paths); i++) {
|
|
path = util_path_sysfs("bus/ccw/drivers/%s/%s", driver_paths[i], busid);
|
|
if (access(path, R_OK) == 0) {
|
|
free(path);
|
|
return 1;
|
|
}
|
|
free(path);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Check if the specified device is a valid virtio subchannel device
|
|
*/
|
|
int ccw_is_virtio_device(const char *device)
|
|
{
|
|
char path[PATH_MAX] = { '\0' };
|
|
unsigned virtio = 0;
|
|
char *path_pattern;
|
|
|
|
if (device_sysfs_path(device, path, sizeof(path)) != 0)
|
|
return -1;
|
|
|
|
/*
|
|
* The output has the following format:
|
|
* /sys/devices/css0/0.0.0000/0.0.0000/virtio0/block/vda
|
|
*/
|
|
path_pattern = util_path_sysfs("devices/css0/%%*[0-9a-f.]/%%*[0-9a-f.]/virtio%%u");
|
|
if (sscanf(path, path_pattern, &virtio) != 1) {
|
|
free(path_pattern);
|
|
return -1;
|
|
}
|
|
free(path_pattern);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return CCW Bus ID
|
|
*/
|
|
void ccw_busid_get(const char *device, char *busid)
|
|
{
|
|
char path[PATH_MAX] = { '\0' };
|
|
char *path_pattern;
|
|
|
|
if (device_sysfs_path(device, path, sizeof(path)) != 0)
|
|
ERR_EXIT("Could not lookup device number for \"%s\"", device);
|
|
|
|
/*
|
|
* The output has the following format:
|
|
* /sys/devices/css0/0.0.0119/0.0.3f19/block/dasda
|
|
* /sys/devices/css0/0.0.0000/0.0.0000/virtio0/block/vda
|
|
*/
|
|
path_pattern = util_path_sysfs("devices/css0/%%*[0-9a-f.]/%%[0-9a-f.]");
|
|
if (sscanf(path, path_pattern, busid) != 1) {
|
|
free(path_pattern);
|
|
ERR_EXIT("Could not lookup device number for \"%s\"", device);
|
|
}
|
|
free(path_pattern);
|
|
|
|
return;
|
|
}
|