This patchset fixes problems while trying to allocate space for PCI
endpoint function.
The problems, and related fixups, have been found while trying to link two
renesas rcar-gen4 r8a779f0-spider devices with the vNTB endpoint
function. This platform has 2 configurable BAR0 and BAR2, with an alignment
of 1MB, and fairly small fixed BAR4 of 256B.
This was tested with
* BAR0 (1MB): CTRL+SPAD
* BAR2 (1MB): MW0
* BAR4 (256B): Doorbell
This setup is currently not supported by the vNTB EP driver and requires a
small hack. I'm working on that too.
Changes in v3:
- Rebased on v6.15-rc1
- Fix build issue with newly introduced nvme endpoint function
- Link to v2: https://lore.kernel.org/r/20250404-pci-ep-size-alignment-v2-0-c3a0db4cfc57@baylibre.com
Changes in v2:
- Allocate space that match the iATU alignment requirement, as previously
done.
- Chose not to add a new member in struct pci_epf_bar, as initially
discussed. After reworking the code, that did not seem necessary.
- Make sure SPAD registers are 4 bytes aligned in the vNTB endpoint function
- Link to v1: https://lore.kernel.org/r/20250328-pci-ep-size-alignment-v1-0-ee5b78b15a9a@baylibre.com
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
---
Jerome Brunet (3):
PCI: endpoint: add epc_feature argument for pci_epf_free_space()
PCI: endpoint: improve fixed_size bar handling when allocating space
PCI: endpoint: pci-epf-vntb: simplify ctrl/spad space allocation
drivers/nvme/target/pci-epf.c | 3 +-
drivers/pci/endpoint/functions/pci-epf-ntb.c | 3 +-
drivers/pci/endpoint/functions/pci-epf-test.c | 2 ++
drivers/pci/endpoint/functions/pci-epf-vntb.c | 42 ++++++++++-----------------
drivers/pci/endpoint/pci-epf-core.c | 27 ++++++++++++-----
include/linux/pci-epf.h | 1 +
6 files changed, 42 insertions(+), 36 deletions(-)
---
base-commit: 0af2f6be1b4281385b618cb86ad946eded089ac8
change-id: 20250328-pci-ep-size-alignment-9d85b28b8050
Best regards,
--
Jerome