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 v5: - Collect Reviewed-by trailer - Fix nit full stop comment - Link to v4: https://lore.kernel.org/r/20250422-pci-ep-size-alignment-v4-0-6bd58443fee9@xxxxxxxxxxxx Changes in v4: - Drop patch 1 of v3 and add new .aligned_size in struct pci_epf_bar instead re-computing the aligned size on the path freeing the memory - Link to v3: https://lore.kernel.org/r/20250407-pci-ep-size-alignment-v3-0-865878e68cc8@xxxxxxxxxxxx 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@xxxxxxxxxxxx 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@xxxxxxxxxxxx Signed-off-by: Jerome Brunet <jbrunet@xxxxxxxxxxxx> --- Jerome Brunet (2): PCI: endpoint: improve fixed_size bar handling when allocating space PCI: endpoint: pci-epf-vntb: simplify ctrl/spad space allocation drivers/pci/endpoint/functions/pci-epf-vntb.c | 26 +++----------------------- drivers/pci/endpoint/pci-epf-core.c | 21 ++++++++++++++------- include/linux/pci-epf.h | 3 +++ 3 files changed, 20 insertions(+), 30 deletions(-) --- base-commit: 92713f0ea620bbe923eb4e7bda408e5c79597cd4 change-id: 20250328-pci-ep-size-alignment-9d85b28b8050 Best regards, -- Jerome
