Re: intel-lpss 0000:00:15.1: idma64_irq: status=0x0, millions of lines spamming journal

[Mika Westerberg <mika.westerberg@linux.intel.com>]

On Tue, Apr 25, 2023 at 01:14:35PM -0400, Chris Murphy wrote:
> 
> 
> On Tue, Apr 25, 2023, at 3:01 AM, Mika Westerberg wrote:
> > Hi Chris,
> >
> > Would you be able to bisect this to a mainline commit?
> 
> Difficult in the near term.
> 
> 
> > At least looking at the changes between v6.3-rc1 and v6.3-rc7 there is
> > virtually nothing to any of these drivers involved. The log itself looks
> > like:
> >
> >        dev_vdbg(idma64->dma.dev, "%s: status=%#x\n", __func__, status);
> >
> > so this should not be enabled at all unless CONFIG_DMADEVICES_VDEBUG is
> > set to y which seems odd in distro kernel.
> 
> $ grep DMADEVICES /boot/config-6.3.0-0.rc2.20230315git6015b1aca1a2.25.fc39.x86_64+debug 
> CONFIG_DMADEVICES=y
> CONFIG_DMADEVICES_DEBUG=y
> # CONFIG_DMADEVICES_VDEBUG is not set
> $ grep DMADEVICES /boot/config-6.3.0-0.rc2.20230317git38e04b3e4240.27.fc39.x86_64+debug 
> CONFIG_DMADEVICES=y
> CONFIG_DMADEVICES_DEBUG=y
> CONFIG_DMADEVICES_VDEBUG=y
> 
> It follows the bug, though I'm not sure if this is the true source of the problem?

Okay, so the issue here I think is just that the VDEBUG is enabled.
Since idma64 and I2C share the interrupt, each time a I2C transaction is
done the idma64 interrupt handler is called as well:

17:          0          0      18841          0          0          0          0          0  IR-IO-APIC   17-fasteoi   i2c_designware.1, idma64.1

so these end up in the dmesg and journal. I suggest to just disable the
VDEBUG. Probably was enabled in the Fedora .config by accident as this
is something that should not be enabled by distro kernels.