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

Koichiro Den posted 2 patches 4 days, 17 hours ago
drivers/pci/controller/dwc/pcie-designware-ep.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
[PATCH v2 0/2] PCI: dwc: ep: Fix BAR update handling with in-place epf_bar reuse
Posted by Koichiro Den 4 days, 17 hours ago
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(-)

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2.51.0