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163 lines
6.5 KiB
163 lines
6.5 KiB
From b9146e4dab45e2f76ceca3772564c0f01e227a9f Mon Sep 17 00:00:00 2001 |
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From: Liu Yuan Yuan <bjyyliu@linux.vnet.ibm.com> |
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Date: Fri, 13 Nov 2015 11:50:42 +0100 |
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Subject: [PATCH] udev/path_id: improve and enhance bus detection for Linux on |
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z Systems |
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Improve and enhance the path_id udev builtin to correctly handle bus' |
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available on Linux on z Systems (s390). |
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Previously, the CCW bus and, in particular, any FCP devices on it, have |
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been treated separately. This commit integrates the CCW bus into the |
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device chain loop. FCP devices and their associated SCSI disks are now |
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handled through the common SCSI handling functions in path_id. |
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This implies also a change in the naming of the symbolic links created |
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by udev. So any backports of this commit to existing Linux distribution |
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must be done with care. If a backport is required, a udev rule must be |
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created to also create the "old-style" symbolic links. |
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Apart from the CCW bus, this commit adds bus support for the: |
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- ccwgroup bus which manages network devices, and |
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- ap bus which manages cryptographic adapters |
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- iucv bus which manages IUCV devices on z/VM |
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Cherry-picked from: e7eb5a8d88367a755944fdda3023a308e5272953 |
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Resolves: #1274401 |
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--- |
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rules/40-redhat.rules | 25 +++++++++++++ |
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src/udev/udev-builtin-path_id.c | 63 ++++++++++++++++++--------------- |
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2 files changed, 60 insertions(+), 28 deletions(-) |
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diff --git a/rules/40-redhat.rules b/rules/40-redhat.rules |
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index 0164dc9214..c928d412b7 100644 |
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--- a/rules/40-redhat.rules |
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+++ b/rules/40-redhat.rules |
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@@ -15,3 +15,28 @@ SUBSYSTEM=="scsi", ENV{DEVTYPE}=="scsi_target", TEST!="[module/sg]", RUN+="/sbin |
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# Rule for prandom character device node permissions |
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KERNEL=="prandom", MODE="0644" |
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+ |
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+ |
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+# Rules for creating the ID_PATH for SCSI devices based on the CCW bus |
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+# using the form: ccw-<BUS_ID>-zfcp-<WWPN>:<LUN> |
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+# |
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+ACTION=="remove", GOTO="zfcp_scsi_device_end" |
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+ |
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+# |
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+# Set environment variable "ID_ZFCP_BUS" to "1" if the devices |
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+# (both disk and partition) are SCSI devices based on FCP devices |
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+# |
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+KERNEL=="sd*", SUBSYSTEMS=="ccw", DRIVERS=="zfcp", ENV{.ID_ZFCP_BUS}="1" |
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+ |
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+# For SCSI disks |
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+KERNEL=="sd*[!0-9]", SUBSYSTEMS=="scsi", |
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+ ENV{.ID_ZFCP_BUS}=="1", ENV{DEVTYPE}=="disk", |
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+ SYMLINK+="disk/by-path/ccw-$attr{hba_id}-zfcp-$attr{wwpn}:$attr{fcp_lun}" |
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+ |
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+ |
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+# For partitions on a SCSI disk |
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+KERNEL=="sd*[0-9]", SUBSYSTEMS=="scsi", |
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+ ENV{.ID_ZFCP_BUS}=="1", ENV{DEVTYPE}=="partition", |
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+ SYMLINK+="disk/by-path/ccw-$attr{hba_id}-zfcp-$attr{wwpn}:$attr{fcp_lun}-part%n" |
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+ |
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+LABEL="zfcp_scsi_device_end" |
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diff --git a/src/udev/udev-builtin-path_id.c b/src/udev/udev-builtin-path_id.c |
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index 88a812ff53..19447201b4 100644 |
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--- a/src/udev/udev-builtin-path_id.c |
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+++ b/src/udev/udev-builtin-path_id.c |
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@@ -615,27 +615,23 @@ static struct udev_device *handle_bcma(struct udev_device *parent, char **path) |
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return parent; |
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} |
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-static struct udev_device *handle_ccw(struct udev_device *parent, struct udev_device *dev, char **path) { |
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- struct udev_device *scsi_dev; |
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- |
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- scsi_dev = udev_device_get_parent_with_subsystem_devtype(dev, "scsi", "scsi_device"); |
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- if (scsi_dev != NULL) { |
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- const char *wwpn; |
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- const char *lun; |
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- const char *hba_id; |
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- |
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- hba_id = udev_device_get_sysattr_value(scsi_dev, "hba_id"); |
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- wwpn = udev_device_get_sysattr_value(scsi_dev, "wwpn"); |
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- lun = udev_device_get_sysattr_value(scsi_dev, "fcp_lun"); |
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- if (hba_id != NULL && lun != NULL && wwpn != NULL) { |
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- path_prepend(path, "ccw-%s-zfcp-%s:%s", hba_id, wwpn, lun); |
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- goto out; |
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- } |
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- } |
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+/* Handle devices of AP bus in System z platform. */ |
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+static struct udev_device *handle_ap(struct udev_device *parent, char **path) { |
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+ const char *type, *func; |
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+ |
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+ assert(parent); |
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+ assert(path); |
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+ |
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+ type = udev_device_get_sysattr_value(parent, "type"); |
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+ func = udev_device_get_sysattr_value(parent, "ap_functions"); |
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- path_prepend(path, "ccw-%s", udev_device_get_sysname(parent)); |
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+ if (type != NULL && func != NULL) { |
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+ path_prepend(path, "ap-%s-%s", type, func); |
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+ goto out; |
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+ } |
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+ path_prepend(path, "ap-%s", udev_device_get_sysname(parent)); |
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out: |
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- parent = skip_subsystem(parent, "ccw"); |
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+ parent = skip_subsystem(parent, "ap"); |
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return parent; |
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} |
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@@ -647,15 +643,8 @@ static int builtin_path_id(struct udev_device *dev, int argc, char *argv[], bool |
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bool new_sas_path = false; |
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bool enable_new_sas_path = true; |
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- /* S390 ccw bus */ |
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- parent = udev_device_get_parent_with_subsystem_devtype(dev, "ccw", NULL); |
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- if (parent != NULL) { |
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- handle_ccw(parent, dev, &path); |
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- goto out; |
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- } |
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- |
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restart: |
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- ; |
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+ |
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/* walk up the chain of devices and compose path */ |
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parent = dev; |
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while (parent != NULL) { |
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@@ -718,6 +707,25 @@ restart: |
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supported_parent = true; |
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supported_transport = true; |
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} |
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+ } else if (streq(subsys, "ccw")) { |
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+ path_prepend(&path, "ccw-%s", udev_device_get_sysname(parent)); |
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+ parent = skip_subsystem(parent, "ccw"); |
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+ supported_transport = true; |
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+ supported_parent = true; |
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+ } else if (streq(subsys, "ccwgroup")) { |
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+ path_prepend(&path, "ccwgroup-%s", udev_device_get_sysname(parent)); |
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+ parent = skip_subsystem(parent, "ccwgroup"); |
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+ supported_transport = true; |
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+ supported_parent = true; |
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+ } else if (streq(subsys, "ap")) { |
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+ parent = handle_ap(parent, &path); |
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+ supported_transport = true; |
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+ supported_parent = true; |
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+ } else if (streq(subsys, "iucv")) { |
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+ path_prepend(&path, "iucv-%s", udev_device_get_sysname(parent)); |
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+ parent = skip_subsystem(parent, "iucv"); |
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+ supported_transport = true; |
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+ supported_parent = true; |
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} |
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parent = udev_device_get_parent(parent); |
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@@ -743,7 +751,6 @@ restart: |
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path = NULL; |
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} |
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-out: |
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if (path != NULL) { |
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char tag[UTIL_NAME_SIZE]; |
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size_t i;
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