Re: [PATCH v2 0/2] PCI: dwc: ep: Fix BAR update handling with in-place epf_bar reuse

[Niklas Cassel <cassel@kernel.org>]

On Thu, Feb 19, 2026 at 01:43:56PM -0600, Bjorn Helgaas wrote:
> On Mon, Feb 02, 2026 at 11:54:05PM +0900, Koichiro Den wrote:
> > Hi,
> > 
> > This patch series is a follow-up to a side discussion that started from
> > Niklas' comment at:
> > https://lore.kernel.org/all/aXtrW7viGZfMNZur@ryzen/
> > 
> > This series:
> >   1) Makes BAR Match vs Address Match teardown in DesignWare EP explicit
> >      by returning right after clearing a BAR-match inbound mapping.
> >   2) Fixes the dw_pcie_ep_set_bar() mapping-update path to run
> >      dw_pcie_ep_clear_ib_maps() unconditionally, since the driver cannot
> >      reliably distinguish BAR Match -> BAR Match from Address Match ->
> >      BAR Match transitions when the same epf_bar instance is updated in
> >      place and passed in again.
> > 
> > Base: controller/dwc branch, latest:
> > commit a24149881558 ("PCI: dwc: ep: Add comment explaining controller level
> >                       PTM access in multi PF setup")
> > 
> > Changes since v1:
> >   - Switched from the v1 approach (Y) to the alternative approach (X)
> >     that was proposed earlier in the discussion.
> >     Details of the v1 (Y) vs v2 (X) are described at:
> >     https://lore.kernel.org/all/sextbnbmsur2xjfoun2l4lr5vekmpzae7sx6or2ird44t6ud6d@yprcz43tpq4p/
> >   - Changed the subject.
> > 
> > v1: https://lore.kernel.org/all/20260131133655.218018-1-den@valinux.co.jp/
> > 
> > Thanks,
> > 
> > 
> > Koichiro Den (2):
> >   PCI: dwc: ep: Return after clearing BAR-match inbound mapping
> >   PCI: dwc: ep: Always clear IB maps on BAR update
> > 
> >  drivers/pci/controller/dwc/pcie-designware-ep.c | 15 ++++++++++++---
> >  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> Since this fixes an issue with the new inbound submapping feature
> we merged for v7.0, I put both of these on pci/for-linus for v7.0.

Thank you Bjorn!

If possible, I please consider sending these to Linus as well:
https://patchwork.kernel.org/project/linux-pci/patch/20260210181225.3926165-2-cassel@kernel.org/

The Fixes tag:
Fixes: 8719c64e76bf ("PCI: dwc: ep: Cache MSI outbound iATU mapping")
references a commit that was included in v7.0 merge window, so it would be
nice to have the above fix patch in v7.0.



This is fixing the same problem as 8719c64e76bf ("PCI: dwc: ep: Cache MSI
outbound iATU mapping") fixed for dw_pcie_ep_raise_msi_irq():
https://patchwork.kernel.org/project/linux-pci/patch/20260211175540.105677-2-cassel@kernel.org/

Mani has marked this commit as "Awaiting Upstream", I'm guessing he plans
to queue it for v7.1 ?
If not to much trouble, I think it would be nice to have in v7.0 as well,
so we have both functional dw_pcie_ep_raise_msi_irq() and
dw_pcie_ep_raise_msix_irq() in v7.0.


Kind regards,
Niklas