vfio: Use kconfig if XX/endif blocks instead of repeating 'depends on'

This results in less kconfig wordage and a simpler understanding of the
required "depends on" to create the menu structure.

The next patch increases the nesting level a lot so this is a nice
preparatory simplification.

Signed-off-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Yishai Hadas <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alex Williamson <[email protected]>

drivers/vfio/Kconfig

@@ -1,12 +1,22 @@
 # SPDX-License-Identifier: GPL-2.0-only
+menuconfig VFIO
+	tristate "VFIO Non-Privileged userspace driver framework"
+	select IOMMU_API
+	select VFIO_IOMMU_TYPE1 if MMU && (X86 || S390 || ARM || ARM64)
+	help
+	  VFIO provides a framework for secure userspace device drivers.
+	  See Documentation/driver-api/vfio.rst for more details.
+
+	  If you don't know what to do here, say N.
+
+if VFIO
 config VFIO_IOMMU_TYPE1
 	tristate
-	depends on VFIO
 	default n
 
 config VFIO_IOMMU_SPAPR_TCE
 	tristate
-	depends on VFIO && SPAPR_TCE_IOMMU
+	depends on SPAPR_TCE_IOMMU
 	default VFIO
 
 config VFIO_SPAPR_EEH
@@ -16,23 +26,11 @@ config VFIO_SPAPR_EEH
 
 config VFIO_VIRQFD
 	tristate
-	depends on VFIO
 	select EVENTFD
 	default n
 
-menuconfig VFIO
-	tristate "VFIO Non-Privileged userspace driver framework"
-	select IOMMU_API
-	select VFIO_IOMMU_TYPE1 if MMU && (X86 || S390 || ARM || ARM64)
-	help
-	  VFIO provides a framework for secure userspace device drivers.
-	  See Documentation/driver-api/vfio.rst for more details.
-
-	  If you don't know what to do here, say N.
-
 config VFIO_NOIOMMU
 	bool "VFIO No-IOMMU support"
-	depends on VFIO
 	help
 	  VFIO is built on the ability to isolate devices using the IOMMU.
 	  Only with an IOMMU can userspace access to DMA capable devices be
@@ -49,4 +47,6 @@ source "drivers/vfio/pci/Kconfig"
 source "drivers/vfio/platform/Kconfig"
 source "drivers/vfio/mdev/Kconfig"
 source "drivers/vfio/fsl-mc/Kconfig"
+endif
+
 source "virt/lib/Kconfig"

drivers/vfio/fsl-mc/Kconfig

@@ -1,6 +1,6 @@
 config VFIO_FSL_MC
 	tristate "VFIO support for QorIQ DPAA2 fsl-mc bus devices"
-	depends on VFIO && FSL_MC_BUS
+	depends on FSL_MC_BUS
 	select EVENTFD
 	help
 	  Driver to enable support for the VFIO QorIQ DPAA2 fsl-mc

drivers/vfio/mdev/Kconfig

@@ -2,7 +2,6 @@
 
 config VFIO_MDEV
 	tristate "Mediated device driver framework"
-	depends on VFIO
 	default n
 	help
 	  Provides a framework to virtualize devices.

drivers/vfio/pci/Kconfig

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 config VFIO_PCI
 	tristate "VFIO support for PCI devices"
-	depends on VFIO && PCI
+	depends on PCI
 	depends on MMU
 	select VFIO_VIRQFD
 	select IRQ_BYPASS_MANAGER
@@ -11,9 +11,10 @@ config VFIO_PCI
 
 	  If you don't know what to do here, say N.
 
+if VFIO_PCI
 config VFIO_PCI_VGA
 	bool "VFIO PCI support for VGA devices"
-	depends on VFIO_PCI && X86 && VGA_ARB
+	depends on X86 && VGA_ARB
 	help
 	  Support for VGA extension to VFIO PCI.  This exposes an additional
 	  region on VGA devices for accessing legacy VGA addresses used by
@@ -22,16 +23,14 @@ config VFIO_PCI_VGA
 	  If you don't know what to do here, say N.
 
 config VFIO_PCI_MMAP
-	depends on VFIO_PCI
 	def_bool y if !S390
 
 config VFIO_PCI_INTX
-	depends on VFIO_PCI
 	def_bool y if !S390
 
 config VFIO_PCI_IGD
 	bool "VFIO PCI extensions for Intel graphics (GVT-d)"
-	depends on VFIO_PCI && X86
+	depends on X86
 	default y
 	help
 	  Support for Intel IGD specific extensions to enable direct
@@ -40,3 +39,5 @@ config VFIO_PCI_IGD
 	  and LPC bridge config space.
 
 	  To enable Intel IGD assignment through vfio-pci, say Y.
+
+endif

drivers/vfio/platform/Kconfig

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 config VFIO_PLATFORM
 	tristate "VFIO support for platform devices"
-	depends on VFIO && (ARM || ARM64 || COMPILE_TEST)
+	depends on ARM || ARM64 || COMPILE_TEST
 	select VFIO_VIRQFD
 	help
 	  Support for platform devices with VFIO. This is required to make
@@ -10,9 +10,10 @@ config VFIO_PLATFORM
 
 	  If you don't know what to do here, say N.
 
+if VFIO_PLATFORM
 config VFIO_AMBA
 	tristate "VFIO support for AMBA devices"
-	depends on VFIO_PLATFORM && (ARM_AMBA || COMPILE_TEST)
+	depends on ARM_AMBA || COMPILE_TEST
 	help
 	  Support for ARM AMBA devices with VFIO. This is required to make
 	  use of ARM AMBA devices present on the system using the VFIO
@@ -21,3 +22,4 @@ config VFIO_AMBA
 	  If you don't know what to do here, say N.
 
 source "drivers/vfio/platform/reset/Kconfig"
+endif

drivers/vfio/platform/reset/Kconfig

@@ -1,23 +1,21 @@
 # SPDX-License-Identifier: GPL-2.0-only
 config VFIO_PLATFORM_CALXEDAXGMAC_RESET
 	tristate "VFIO support for calxeda xgmac reset"
-	depends on VFIO_PLATFORM
 	help
 	  Enables the VFIO platform driver to handle reset for Calxeda xgmac
 
 	  If you don't know what to do here, say N.
 
 config VFIO_PLATFORM_AMDXGBE_RESET
 	tristate "VFIO support for AMD XGBE reset"
-	depends on VFIO_PLATFORM
 	help
 	  Enables the VFIO platform driver to handle reset for AMD XGBE
 
 	  If you don't know what to do here, say N.
 
 config VFIO_PLATFORM_BCMFLEXRM_RESET
 	tristate "VFIO support for Broadcom FlexRM reset"
-	depends on VFIO_PLATFORM && (ARCH_BCM_IPROC || COMPILE_TEST)
+	depends on ARCH_BCM_IPROC || COMPILE_TEST
 	default ARCH_BCM_IPROC
 	help
 	  Enables the VFIO platform driver to handle reset for Broadcom FlexRM