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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>
41 lines
1.1 KiB
Plaintext
41 lines
1.1 KiB
Plaintext
# Automatically activate certain s390-specific device types that are attached
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# in offline state when running in an LPAR managed by the Dynamic Partition
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# Manager (DPM).
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#
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# Note that processing is restricted to DPM as there may be use cases for
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# not enabling these device types in non-DPM mode.
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#
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# To deactivate this processing, specify the following on the kernel command
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# line:
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#
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# rd.zdev=no-auto
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ACTION!="add", GOTO="end_dpm"
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# Handle newly added PCI devices in offline state
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SUBSYSTEM=="slots", ATTR{power}=="0", GOTO="check_dpm"
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# Handle newly added crypto devices in offline state
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SUBSYSTEM=="ap", ENV{DEVTYPE}=="ap_card", ATTR{config}=="0", GOTO="check_dpm"
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GOTO="end_dpm"
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LABEL="check_dpm"
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IMPORT{program}="/lib/s390-tools/zdev_id"
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# Check for off-switch
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ENV{ZDEV_NO_AUTO}=="1", GOTO="end_dpm"
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# Check for DPM LPAR
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ENV{ZDEV_IS_DPM}!="1", GOTO="end_dpm"
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ENV{ZDEV_NEST_LEVEL}!="1", GOTO="end_dpm"
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ENV{ZDEV_HYPERVISOR_0}!="LPAR", GOTO="end_dpm"
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# Enable PCI device
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SUBSYSTEM=="slots", ATTR{power}="1"
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# Enable crypto device
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SUBSYSTEM=="ap", ATTR{config}="1"
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# End of rule
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LABEL="end_dpm"
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