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

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Message-Id: <20200804124417.27102-2-alex.bennee@linaro.org>
Date:   Tue,  4 Aug 2020 13:44:15 +0100
From:   Alex Bennée <alex.bennee@...aro.org>
To:     kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, kvmarm@...ts.cs.columbia.edu,
        christoffer.dall@....com, maz@...nel.org,
        Alex Bennée <alex.bennee@...aro.org>,
        Robert Richter <rrichter@...vell.com>,
        linux-pci@...r.kernel.org
Subject: [PATCH  v1 1/3] arm64: allow de-selection of ThunderX PCI controllers

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@...aro.org>
Cc: Robert Richter <rrichter@...vell.com>
Cc: linux-pci@...r.kernel.org
Cc: linux-arm-kernel@...ts.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