linux-kernel - [PATCH 0/2] PCI: endpoint: space allocation fixups

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Message-Id: <20250328-pci-ep-size-alignment-v1-0-ee5b78b15a9a@baylibre.com>
Date: Fri, 28 Mar 2025 15:53:41 +0100
From: Jerome Brunet <jbrunet@...libre.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
 Krzysztof Wilczyński <kw@...ux.com>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, 
 Bjorn Helgaas <bhelgaas@...gle.com>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>, Jon Mason <jdmason@...zu.us>, 
 Dave Jiang <dave.jiang@...el.com>, Allen Hubbe <allenbh@...il.com>
Cc: Marek Vasut <marek.vasut+renesas@...il.com>, 
 Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>, 
 Yuya Hamamachi <yuya.hamamachi.sx@...esas.com>, linux-pci@...r.kernel.org, 
 linux-kernel@...r.kernel.org, ntb@...ts.linux.dev, 
 Jerome Brunet <jbrunet@...libre.com>
Subject: [PATCH 0/2] PCI: endpoint: space allocation fixups

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.

Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
---
Jerome Brunet (2):
      PCI: endpoint: strictly apply bar fixed size to allocate space
      PCI: endpoint: pci-epf-vntb: simplify ctrl/spad space allocation

 drivers/pci/endpoint/functions/pci-epf-vntb.c | 24 ++----------------------
 drivers/pci/endpoint/pci-epf-core.c           |  7 +++----
 2 files changed, 5 insertions(+), 26 deletions(-)
---
base-commit: dea140198b846f7432d78566b7b0b83979c72c2b
change-id: 20250328-pci-ep-size-alignment-9d85b28b8050

Best regards,
-- 
Jerome