Re: [PATCH 0/6] fsl-mc: Move fsl_over to device MSI

[Christophe Leroy (CS GROUP)]

Hi Marc,

Le 23/02/2026 à 14:37, Marc Zyngier a écrit :
> On Fri, 20 Feb 2026 15:41:03 +0000,
> Ioana Ciornei <ioana.ciornei@xxxxxxx> wrote:
> > On Wed, Feb 18, 2026 at 01:51:57PM +0000, Marc Zyngier wrote:
> > > Over the past few years, I have become increasingly annoyed by this
> > > sort of messages in my boot log:
> > >
> > > [    0.067861] fsl-mc MSI: ITS@0x100100040000 domain created
> > > [    0.073352] fsl-mc MSI: ITS@0x100100060000 domain created
> > > [    0.078841] fsl-mc MSI: ITS@0x100100080000 domain created
> > > [    0.084328] fsl-mc MSI: ITS@0x1001000a0000 domain created
> > > [    0.089815] fsl-mc MSI: ITS@0x1001000c0000 domain created
> > > [    0.095303] fsl-mc MSI: ITS@0x1001000e0000 domain created
> > > [    0.100792] fsl-mc MSI: ITS@0x100100100000 domain created
> > > [    0.106281] fsl-mc MSI: ITS@0x100100120000 domain created
> > >
> > > While this is useful on fsl-mc systems, this is completely irrelevant
> > > on 99.99999% of the arm64 machines, which know nothing about the
> > > Freescale stuff. Including all of my machine -- bar *one*.
> > >
> > > Global MSI domains such as the above have been obsoleted for the past
> > > two years, but nobody at NXP seems to have got the message.
> >
> > I do admit that I wasn't aware that this neeeded work. In the future,
> > please let me know of this kind of things and I will do the work.
>
> I guess Thomas did too good a job not breaking fsl-mc when both PCI
> and platform MSIs were rewritten, hence you missing on the good stuff!
>
> > > The obvious solution is to delete some code! While my first port of
> > > call would be to just 'git rm -r drivers/bus/fsl-mc' (only kidding!),
> > > a less invasive solution is to drag that code into the present times.
> > > Which is what this series is doing by converting the whole thing to
> > > device MSI, reusing the platform MSI infrastructure instead of
> > > duplicating it.
> > >
> > > This results in the expected cleanup, and kills the last user of the
> > > non-device-MSI stuff on arm64. You're welcome.
> >
> > Thanks!
> >
> > Tested-by: Ioana Ciornei <ioana.ciornei@xxxxxxx> # LX2160ARDB, LS2088ARDB
> > Reviewed-by: Ioana Ciornei <ioana.ciornei@xxxxxxx>
>
> Thanks for giving it a go.

Don't know what is your merge plan. I wanted to push it to soc fsl tree 
but it doesn't apply on top of v7.0-rc1:

$ LANG= b4 shazam -l 20260218135203.2267907-1-maz@xxxxxxxxxx
Grabbing thread from 
lore.kernel.org/all/20260218135203.2267907-1-maz@xxxxxxxxxx/t.mbox.gz
Checking for newer revisions
Grabbing search results from lore.kernel.org
Analyzing 14 messages in the thread
Analyzing 0 code-review messages
Checking attestation on all messages, may take a moment...
---
  ✓ [PATCH 1/6] fsl-mc: Remove MSI domain propagation to sub-devices
    + Tested-by: Ioana Ciornei <ioana.ciornei@xxxxxxx> (✓ DKIM/nxp.com)
    + Reviewed-by: Ioana Ciornei <ioana.ciornei@xxxxxxx> (✓ DKIM/nxp.com)
    + Tested-by: Sascha Bischoff <sascha.bischoff@xxxxxxx> (✓ DKIM/arm.com)
    + Link: 
https://lore.kernel.org/r/20260218135203.2267907-2-maz@xxxxxxxxxx
  ✓ [PATCH 2/6] fsl_mc: Add minimal infrastructure to use platform MSI
    + Tested-by: Ioana Ciornei <ioana.ciornei@xxxxxxx> (✓ DKIM/nxp.com)
    + Reviewed-by: Ioana Ciornei <ioana.ciornei@xxxxxxx> (✓ DKIM/nxp.com)
    + Tested-by: Sascha Bischoff <sascha.bischoff@xxxxxxx> (✓ DKIM/arm.com)
    + Link: 
https://lore.kernel.org/r/20260218135203.2267907-3-maz@xxxxxxxxxx
  ✓ [PATCH 3/6] irqchip/gic-v3-its: Add fsl_mc device plumbing to the 
msi-parent handling
    + Tested-by: Ioana Ciornei <ioana.ciornei@xxxxxxx> (✓ DKIM/nxp.com)
    + Reviewed-by: Ioana Ciornei <ioana.ciornei@xxxxxxx> (✓ DKIM/nxp.com)
    + Tested-by: Sascha Bischoff <sascha.bischoff@xxxxxxx> (✓ DKIM/arm.com)
    + Link: 
https://lore.kernel.org/r/20260218135203.2267907-4-maz@xxxxxxxxxx
  ✓ [PATCH 4/6] fsl_mc: Switch over to per-device platform MSI
    + Tested-by: Ioana Ciornei <ioana.ciornei@xxxxxxx> (✓ DKIM/nxp.com)
    + Reviewed-by: Ioana Ciornei <ioana.ciornei@xxxxxxx> (✓ DKIM/nxp.com)
    + Tested-by: Sascha Bischoff <sascha.bischoff@xxxxxxx> (✓ DKIM/arm.com)
    + Link: 
https://lore.kernel.org/r/20260218135203.2267907-5-maz@xxxxxxxxxx
  ✓ [PATCH 5/6] fsl_mc: Remove legacy MSI implementation
    + Tested-by: Ioana Ciornei <ioana.ciornei@xxxxxxx> (✓ DKIM/nxp.com)
    + Reviewed-by: Ioana Ciornei <ioana.ciornei@xxxxxxx> (✓ DKIM/nxp.com)
    + Tested-by: Sascha Bischoff <sascha.bischoff@xxxxxxx> (✓ DKIM/arm.com)
    + Link: 
https://lore.kernel.org/r/20260218135203.2267907-6-maz@xxxxxxxxxx
  ✓ [PATCH 6/6] platform-msi: Remove stale comment
    + Tested-by: Ioana Ciornei <ioana.ciornei@xxxxxxx> (✓ DKIM/nxp.com)
    + Reviewed-by: Ioana Ciornei <ioana.ciornei@xxxxxxx> (✓ DKIM/nxp.com)
    + Tested-by: Sascha Bischoff <sascha.bischoff@xxxxxxx> (✓ DKIM/arm.com)
    + Link: 
https://lore.kernel.org/r/20260218135203.2267907-7-maz@xxxxxxxxxx
  ---
  ✓ Signed: DKIM/kernel.org
---
Total patches: 6
---
Applying: fsl-mc: Remove MSI domain propagation to sub-devices
Applying: fsl_mc: Add minimal infrastructure to use platform MSI
Applying: irqchip/gic-v3-its: Add fsl_mc device plumbing to the 
msi-parent handling
Patch failed at 0003 irqchip/gic-v3-its: Add fsl_mc device plumbing to 
the msi-parent handling
error: patch failed: drivers/irqchip/irq-gic-its-msi-parent.c:186
error: drivers/irqchip/irq-gic-its-msi-parent.c: patch does not apply
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am 
--abort".
hint: Disable this message with "git config set advice.mergeConflict false"


Let me know how you want to proceed.

Thanks
Christophe