From e7eb5a8d88367a755944fdda3023a308e5272953 Mon Sep 17 00:00:00 2001 From: Liu Yuan Yuan Date: Fri, 13 Nov 2015 11:50:42 +0100 Subject: udev/path_id: improve and enhance bus detection for Linux on z Systems Improve and enhance the path_id udev builtin to correctly handle bus' available on Linux on z Systems (s390). Previously, the CCW bus and, in particular, any FCP devices on it, have been treated separately. This commit integrates the CCW bus into the device chain loop. FCP devices and their associated SCSI disks are now handled through the common SCSI handling functions in path_id. This implies also a change in the naming of the symbolic links created by udev. So any backports of this commit to existing Linux distribution must be done with care. If a backport is required, a udev rule must be created to also create the "old-style" symbolic links. Apart from the CCW bus, this commit adds bus support for the: - ccwgroup bus which manages network devices, and - ap bus which manages cryptographic adapters - iucv bus which manages IUCV devices on z/VM --- src/udev/udev-builtin-path_id.c | 57 ++++++++++++++++++++++------------------- 1 file changed, 30 insertions(+), 27 deletions(-) (limited to 'src') diff --git a/src/udev/udev-builtin-path_id.c b/src/udev/udev-builtin-path_id.c index 1e190140b2..aa18c7e420 100644 --- a/src/udev/udev-builtin-path_id.c +++ b/src/udev/udev-builtin-path_id.c @@ -593,31 +593,23 @@ static struct udev_device *handle_bcma(struct udev_device *parent, char **path) return parent; } -static struct udev_device *handle_ccw(struct udev_device *parent, struct udev_device *dev, char **path) { - struct udev_device *scsi_dev; +/* Handle devices of AP bus in System z platform. */ +static struct udev_device *handle_ap(struct udev_device *parent, char **path) { + const char *type, *func; assert(parent); - assert(dev); assert(path); - scsi_dev = udev_device_get_parent_with_subsystem_devtype(dev, "scsi", "scsi_device"); - if (scsi_dev != NULL) { - const char *wwpn; - const char *lun; - const char *hba_id; - - hba_id = udev_device_get_sysattr_value(scsi_dev, "hba_id"); - wwpn = udev_device_get_sysattr_value(scsi_dev, "wwpn"); - lun = udev_device_get_sysattr_value(scsi_dev, "fcp_lun"); - if (hba_id != NULL && lun != NULL && wwpn != NULL) { - path_prepend(path, "ccw-%s-zfcp-%s:%s", hba_id, wwpn, lun); - goto out; - } - } + type = udev_device_get_sysattr_value(parent, "type"); + func = udev_device_get_sysattr_value(parent, "ap_functions"); - path_prepend(path, "ccw-%s", udev_device_get_sysname(parent)); + if (type != NULL && func != NULL) { + path_prepend(path, "ap-%s-%s", type, func); + goto out; + } + path_prepend(path, "ap-%s", udev_device_get_sysname(parent)); out: - parent = skip_subsystem(parent, "ccw"); + parent = skip_subsystem(parent, "ap"); return parent; } @@ -629,13 +621,6 @@ static int builtin_path_id(struct udev_device *dev, int argc, char *argv[], bool assert(dev); - /* S390 ccw bus */ - parent = udev_device_get_parent_with_subsystem_devtype(dev, "ccw", NULL); - if (parent != NULL) { - handle_ccw(parent, dev, &path); - goto out; - } - /* walk up the chain of devices and compose path */ parent = dev; while (parent != NULL) { @@ -683,6 +668,25 @@ static int builtin_path_id(struct udev_device *dev, int argc, char *argv[], bool parent = skip_subsystem(parent, "scm"); supported_transport = true; supported_parent = true; + } else if (streq(subsys, "ccw")) { + path_prepend(&path, "ccw-%s", udev_device_get_sysname(parent)); + parent = skip_subsystem(parent, "ccw"); + supported_transport = true; + supported_parent = true; + } else if (streq(subsys, "ccwgroup")) { + path_prepend(&path, "ccwgroup-%s", udev_device_get_sysname(parent)); + parent = skip_subsystem(parent, "ccwgroup"); + supported_transport = true; + supported_parent = true; + } else if (streq(subsys, "ap")) { + parent = handle_ap(parent, &path); + supported_transport = true; + supported_parent = true; + } else if (streq(subsys, "iucv")) { + path_prepend(&path, "iucv-%s", udev_device_get_sysname(parent)); + parent = skip_subsystem(parent, "iucv"); + supported_transport = true; + supported_parent = true; } if (parent) @@ -705,7 +709,6 @@ static int builtin_path_id(struct udev_device *dev, int argc, char *argv[], bool if (streq(udev_device_get_subsystem(dev), "block") && !supported_transport) path = mfree(path); -out: if (path != NULL) { char tag[UTIL_NAME_SIZE]; size_t i; -- cgit v1.2.3-54-g00ecf