[PATCH v1 1/3] arm64: allow de-selection of ThunderX PCI controllers

Alex Bennée
2020-08-04T12:46:36Z

For a pure VirtIO guest bringing in all the PCI quirk handling adds a
significant amount of bloat to kernel we don't need. Solve this by
adding a CONFIG symbol for the ThunderX PCI devices and allowing it to
be turned off. Saving over 300k from the uncompressed vmlinux:

-rwxr-xr-x 1 alex alex 85652472 Aug 3 16:48 vmlinux*
-rwxr-xr-x 1 alex alex 86033880 Aug 3 16:39 vmlinux.orig*

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Cc: Robert Richter <rrichter@marvell.com>
Cc: linux-pci@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
---
arch/arm64/Kconfig.platforms | 2 ++
arch/arm64/configs/defconfig | 1 +
drivers/pci/controller/Kconfig | 7 +++++++
drivers/pci/controller/Makefile | 4 ++--
4 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/Kconfig.platforms b/arch/arm64/Kconfig.platforms
index 8dd05b2a925c..a328eebdaa59 100644
--- a/arch/arm64/Kconfig.platforms
+++ b/arch/arm64/Kconfig.platforms
@@ -253,12 +253,14 @@ config ARCH_SPRD

config ARCH_THUNDER
bool "Cavium Inc. Thunder SoC Family"
+ select PCI_THUNDER
help
This enables support for Cavium's Thunder Family of SoCs.

config ARCH_THUNDER2
bool "Cavium ThunderX2 Server Processors"
select GPIOLIB
+ select PCI_THUNDER
help
This enables support for Cavium's ThunderX2 CN99XX family of
server processors.
diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 2ca7ba69c318..d840cba99941 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -199,6 +199,7 @@ CONFIG_PCI_HOST_GENERIC=y
CONFIG_PCI_XGENE=y
CONFIG_PCIE_ALTERA=y
CONFIG_PCIE_ALTERA_MSI=y
+CONFIG_PCI_THUNDER=y
CONFIG_PCI_HOST_THUNDER_PEM=y
CONFIG_PCI_HOST_THUNDER_ECAM=y
CONFIG_PCIE_ROCKCHIP_HOST=m
diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
index adddf21fa381..28335ffa5d48 100644
--- a/drivers/pci/controller/Kconfig
+++ b/drivers/pci/controller/Kconfig
@@ -286,6 +286,13 @@ config PCI_LOONGSON
Say Y here if you want to enable PCI controller support on
Loongson systems.

+config PCI_THUNDER
+ bool "Thunder X PCIE controllers"
+ depends on ARM64
+ select PCI_QUIRKS
+ help
+ Say Y here to enable ThunderX ECAM and PEM PCI controllers.
+
source "drivers/pci/controller/dwc/Kconfig"
source "drivers/pci/controller/mobiveil/Kconfig"
source "drivers/pci/controller/cadence/Kconfig"
diff --git a/drivers/pci/controller/Makefile b/drivers/pci/controller/Makefile
index efd9733ead26..8fad4781a5d3 100644
--- a/drivers/pci/controller/Makefile
+++ b/drivers/pci/controller/Makefile
@@ -45,8 +45,8 @@ obj-y += mobiveil/
# ARM64 and use internal ifdefs to only build the pieces we need
# depending on whether ACPI, the DT driver, or both are enabled.

+obj-$(CONFIG_PCI_THUNDER) += pci-thunder-ecam.o
+obj-$(CONFIG_PCI_THUNDER) += pci-thunder-pem.o
ifdef CONFIG_PCI
-obj-$(CONFIG_ARM64) += pci-thunder-ecam.o
-obj-$(CONFIG_ARM64) += pci-thunder-pem.o
obj-$(CONFIG_ARM64) += pci-xgene.o
endif
--
2.20.1