PCI and crypto devices defined using the IBM Z Dynamic Partition Manager
(DPM) will start in an offline/unconfigured state that requires manual
intervention before the associated Linux function can be used. This
results for example in PCI networking interfaces being unavailable in a
distribution installer system.
Fix this by providing a udev rule and initial RAM-disk logic that
automatically enables PCI and crypto devices either during boot, or when
they are defined at run-time. This processing can be suppressed by
specifying the "rd.zdev=no-auto" parameter on the kernel command line.
Auto-configuration is limited to Linux running in DPM LPARs because
PCI-functions and crypto devices defined by DPM are always intended for
use by a single LPAR only.
For Linux running in classic-mode LPARs or virtual machines, leaving PCI
and crypto devices in an offline state may be useful to allow defining a
device as available to multiple systems, where only the system that
intends to make use of the device should enable it.
Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Enable user to specify that a device should be configured early, that is
during the initial RAM-disk boot phase. This may be necessary, e.g. to
override auto-configuration for a device which is also applied during
that boot phase. It may also be used to manually specify devices that
are required to access the root file system, such as networking devices.
Users can mark devices as requiring early configuration by specifying
a value of 1 for the newly added internal attribute zdev:early:
# chzdev dasd-eckd 0.0.1234 -p zdev:early=1
This can be changed back by removing the attribute setting, or by
setting the attribute value to 0:
# chzdev dasd-eckd 0.0.1234 -p -r zdev:early
or
# chzdev dasd-eckd 0.0.1234 -p zdev:early=0
Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Add a dracut hook that applies firmware-provided I/O configuration data
as auto-configuration during boot. This way, all I/O devices configured
by DPM are automatically brought online without further user
interaction.
This mechanism is active by default. It can be deactivated by specifying
the following parameter on the kernel command line:
rd.zdev=no-auto
Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Running dracut when the root device is not known to zdev (for example
because it is located on a virtio block device) will cause the zdev
dracut module to incorrectly return an error in the installkernel()
function. As a result dracut aborts with an error.
Fix this by ensuring that the non-zero exit code resulting from lszdev
not being able to determine the root device is not passed on to the
calling function. Also remove unnecessary error output in this case
by leaving the install() function early when the root device is not
known to zdev.
Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
During processing, the zdev-provided dracut module creates a temporary
file using the mktemp tool. Due to a missing path specification
in the filename template, mktemp tries to create the temporary file
in the current working directory which fails if that directory is not
writable:
# cd /sys
# dracut -Nf
mktemp: failed to create file via template 'dracut-zdev.XXXX': No such
file or directory
chzdev: Could not write to file : No such file or directory
sed: can't read : No such file or directory
chzdev: Could not open file : No such file or directory
Fix this by specifying option --tmpdir when calling mktemp.
Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
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>
