On 4/2/2013 9:35 AM, Joerg Roedel wrote:
On Wed, Mar 27, 2013 at 06:51:34PM -0500, [email protected] wrote:
From: Suravee Suthikulpanit <[email protected]>
Add IOMMU event log injection interface for testing event flag decoding logic.
This interface allows users to specify device id, event flag, and event types
via debugfs.
echo 0x300 > /sys/kernel/debug/amd-iommu-evninj/devid // (e.g. Bus:Dev.fun
3:0.0)
echo 0xfff > /sys/kernel/debug/amd-iommu-evninj/flags // (e.g. Specify flag
value)
echo 2 > /sys/kernel/debug/amd-iommu-evninj/type // (e.g. for
IO_PAGE_FAULT event)
Once the event is injected, IOMMU driver will parse and print out the event
information
in kernel log (dmesg) with the various information depending on the types of
event and flag
specified.
Why is this needed? I think the risk of regressions in the
event-handling code is to low to justify the need for an event-injection
mechanism.
You are right, it is not needed. I create this interface to provide a
way for reviewers to test out how the report will be generated for each
type of events/errors.
Suravee
Joerg
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