On Mon, Mar 23, 2026 at 12:59:26PM +0100, Christian Bruel wrote:
> For platforms with a limited iATU inbound window entries, pci_epc_set_bar()
> might fail to allocate the ATU entries for subrange maps requiring more
> than 1 slot.
> For the dwc controller, this failure is reported with -ENOSPC in
> dw_pcie_ep_set_bar(). In this case, the epf test cannot be run and needs
> to be skipped.
>
> For other controllers (Rockchip, RCar, Cadence) the .set_bar functions do
> not use this error.
>
> Signed-off-by: Christian Bruel <christian.bruel@foss.st.com>
> ---
> Changes in v3:
> - Remove 'BAR' from SKIP print message (Niklas)
> - Added 'Reviewed-by: Niklas Cassel <cassel@kernel.org>' tag
> - Link to v2: https://lore.kernel.org/r/20260323-skip-bar_subrange-tests-if-enospc-v2-0-2080f878134d@foss.st.com
>
> Changes in v2:
> - Rebased, reordered patches
> - Clarified reporting message in selftest
> - Renamed STATUS_BAR_SUBRANGE_SETUP_NOPSC STATUS_NO_RESOURCE
> - Link to v1: https://lore.kernel.org/r/20260318-skip-bar_subrange-tests-if-enospc-v1-0-f1a49534ebea@foss.st.com
>
> ---
> Christian Bruel (3):
> PCI: endpoint: pci-epf-test: Handle -ENOSPC in subrange_setup
> misc: pci_endpoint_test: Handle -ENOSPC in subrange mapping test case
> selftests: pci_endpoint: Skip BAR subrange test on -ENOSPC
>
> drivers/misc/pci_endpoint_test.c | 3 ++-
> drivers/pci/endpoint/functions/pci-epf-test.c | 3 +++
> tools/testing/selftests/pci_endpoint/pci_endpoint_test.c | 2 ++
> 3 files changed, 7 insertions(+), 1 deletion(-)
> ---
> base-commit: 785f0eb2f85decbe7c1ef9ae922931f0194ffc2e
> change-id: 20260318-skip-bar_subrange-tests-if-enospc-c26f03038e92
>
> Best regards,
> --
> Christian Bruel <christian.bruel@foss.st.com>
Hi Christian,
Thanks for the work. Looks good to me.
Reviewed-by: Koichiro Den <den@valinux.co.jp>
For maintainers:
For this series to behave as intended in all scenarios, please apply [1] first,
then apply this series on top, as it depends on [1].
[1] https://lore.kernel.org/linux-pci/20260320140139.2415480-1-den@valinux.co.jp/
Best regards,
Koichiro
>