On 27/02/2020 1:48 pm, Russell King - ARM Linux admin wrote:
On Thu, Feb 27, 2020 at 01:44:56PM +0000, Robin Murphy wrote:
On 27/02/2020 11:57 am, Russell King wrote:
On the LX2160A, there are lots (about 160) of IOMMU messages produced
during boot; this is excessive. Reduce the severity of these messages
to debug level.
That's... a lot. Does the system really have that many devices, or is some
driver being stupid and repeatedly populating and destroying an entire bus
in a probe-deferral dance?
It's all the devices created by for the mc-bus for the DPAA2
networking support. I don't know the technicalities, just that
the boot is spammed with these messages.
Well, the "technicalities" are really just whether the thing before the
colon on each message is unique or not. If you're seeing multiple add
and remove calls pertaining to the same device (or frankly any remove
calls at all during boot) then it smacks of something somewhere wasting
time and resources with unnecessary busywork, which is indicative of
either poor design or an actual bug, either of which would deserve fixing.
Robin.
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