linux-kernel - [PATCH v5 0/4] PCI: Keystone: Enable loadable module support

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Message-ID: <20251029080547.1253757-1-s-vadapalli@ti.com>
Date: Wed, 29 Oct 2025 13:34:48 +0530
From: Siddharth Vadapalli <s-vadapalli@...com>
To: <lpieralisi@...nel.org>, <kwilczynski@...nel.org>, <mani@...nel.org>,
	<robh@...nel.org>, <bhelgaas@...gle.com>, <jingoohan1@...il.com>,
	<christian.bruel@...s.st.com>, <krishna.chundru@....qualcomm.com>,
	<qiang.yu@....qualcomm.com>, <shradha.t@...sung.com>,
	<thippeswamy.havalige@....com>, <inochiama@...il.com>, <fan.ni@...sung.com>,
	<cassel@...nel.org>, <kishon@...nel.org>, <18255117159@....com>,
	<rongqianfeng@...o.com>, <jirislaby@...nel.org>
CC: <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <srk@...com>, <s-vadapalli@...com>
Subject: [PATCH v5 0/4] PCI: Keystone: Enable loadable module support

Hello,

This series enables support for the 'pci-keystone.c' driver to be built
as a loadable module. The motivation for the series is that PCIe is not
a necessity for booting Linux due to which the 'pci-keystone.c' driver
does not need to be built-in.

Series is based on 6.18-rc1 tag of Mainline Linux.

This series has __NO__ dependencies.

v4:
https://lore.kernel.org/r/20251022095724.997218-1-s-vadapalli@ti.com/
Changes since v4:
- To fix the build error on ARM32 platforms as reported at:
  https://lore.kernel.org/r/202510281008.jw19XuyP-lkp@intel.com/
  patch 4 in the series has been updated by introducing a new config
  named "PCI_KEYSTONE_TRISTATE" which allows building the driver as
  a loadable module. Additionally, this newly introduced config can
  be enabled only for non-ARM32 platforms. As a result, ARM32 platforms
  continue using the existing PCI_KEYSTONE config which is a bool, while
  ARM64 platforms can use PCI_KEYSTONE_TRISTATE which is a tristate, and
  can optionally enabled loadable module support being enabled by this
  series.

Series has been compile tested with W=1 for ARM32 using
arm-none-linux-gnueabihf-gcc

Series has been tested for functionality on an ARM64 platform (AM65 SoC):
AM654-EVM with an NVMe SSD connected to the PCIe Connector of the EVM.
Test Logs:
https://gist.github.com/Siddharth-Vadapalli-at-TI/474a16037d990206e1d22399a93dfee7

Regards,
Siddharth.

Siddharth Vadapalli (4):
  PCI: Export pci_get_host_bridge_device() for use by pci-keystone
  PCI: dwc: Export dw_pcie_allocate_domains() and
    dw_pcie_ep_raise_msix_irq()
  PCI: keystone: Exit ks_pcie_probe() for invalid mode
  PCI: keystone: Add support to build as a loadable module

 drivers/pci/controller/dwc/Kconfig            | 15 +++-
 drivers/pci/controller/dwc/Makefile           |  3 +
 drivers/pci/controller/dwc/pci-keystone.c     | 80 +++++++++++--------
 .../pci/controller/dwc/pcie-designware-ep.c   |  1 +
 .../pci/controller/dwc/pcie-designware-host.c |  1 +
 drivers/pci/host-bridge.c                     |  1 +
 include/linux/pci.h                           |  1 +
 7 files changed, 65 insertions(+), 37 deletions(-)

-- 
2.51.0