PCI/MSI: irqchip: Fix PCI_MSI dependencies

The PCI_MSI symbol is used inconsistently throughout the tree, with some
drivers using 'select' and others using 'depends on', or using conditional
selects.  This keeps causing problems; the latest one is a result of
ARCH_ALPINE using a 'select' statement to enable its platform-specific MSI
driver without enabling MSI:

  warning: (ARCH_ALPINE) selects ALPINE_MSI which has unmet direct dependencies (PCI && PCI_MSI)
  drivers/irqchip/irq-alpine-msi.c:104:15: error: variable 'alpine_msix_domain_info' has initializer but incomplete type
   static struct msi_domain_info alpine_msix_domain_info = {
		 ^~~~~~~~~~~~~~~
  drivers/irqchip/irq-alpine-msi.c:105:2: error: unknown field 'flags' specified in initializer
    .flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
    ^
  drivers/irqchip/irq-alpine-msi.c:105:11: error: 'MSI_FLAG_USE_DEF_DOM_OPS' undeclared here (not in a function)
    .flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
	     ^~~~~~~~~~~~~~~~~~~~~~~~

There is little reason to enable PCI support for a platform that uses MSI
but then leave MSI disabled at compile time.

Select PCI_MSI from irqchips that implement MSI, and make PCI host bridges
that use MSI on ARM depend on PCI_MSI_IRQ_DOMAIN.

For all three architectures that support PCI_MSI_IRQ_DOMAIN (ARM, ARM64,
X86), enable it by default whenever MSI is enabled.

[bhelgaas: changelog, omit crypto config change]
Suggested-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>

5 files changed, 31 insertions, 24 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 90542db1220d..354c167a2b42 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -715,7 +715,7 @@ config ARCH_VIRT
         depends on ARCH_MULTI_V7
         select ARM_AMBA
         select ARM_GIC
-        select ARM_GIC_V2M if PCI_MSI
+        select ARM_GIC_V2M if PCI
         select ARM_GIC_V3
         select ARM_PSCI
         select HAVE_ARM_ARCH_TIMER
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 5a0a691d4220..70ee71fda467 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -20,9 +20,9 @@ config ARM64
         select ARM_ARCH_TIMER
         select ARM_GIC
         select AUDIT_ARCH_COMPAT_GENERIC
-        select ARM_GIC_V2M if PCI_MSI
+        select ARM_GIC_V2M if PCI
         select ARM_GIC_V3
-        select ARM_GIC_V3_ITS if PCI_MSI
+        select ARM_GIC_V3_ITS if PCI
         select ARM_PSCI_FW
         select BUILDTIME_EXTABLE_SORT
         select CLONE_BACKWARDS
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index fa33c50b0e5a..11ecb6cfb2e5 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -15,9 +15,9 @@ config ARM_GIC_MAX_NR
 
 config ARM_GIC_V2M
         bool
-        depends on ARM_GIC
-        depends on PCI && PCI_MSI
-        select PCI_MSI_IRQ_DOMAIN
+        depends on PCI
+        select ARM_GIC
+        select PCI_MSI
 
 config GIC_NON_BANKED
         bool
@@ -31,7 +31,8 @@ config ARM_GIC_V3
 
 config ARM_GIC_V3_ITS
         bool
-        select PCI_MSI_IRQ_DOMAIN
+        depends on PCI
+        depends on PCI_MSI
 
 config ARM_NVIC
         bool
@@ -56,13 +57,13 @@ config ARM_VIC_NR
 config ARMADA_370_XP_IRQ
         bool
         select GENERIC_IRQ_CHIP
-        select PCI_MSI_IRQ_DOMAIN if PCI_MSI
+        select PCI_MSI if PCI
 
 config ALPINE_MSI
         bool
-        depends on PCI && PCI_MSI
+        depends on PCI
+        select PCI_MSI
         select GENERIC_IRQ_CHIP
-        select PCI_MSI_IRQ_DOMAIN
 
 config ATMEL_AIC_IRQ
         bool
@@ -111,7 +112,6 @@ config HISILICON_IRQ_MBIGEN
         bool
         select ARM_GIC_V3
         select ARM_GIC_V3_ITS
-        select GENERIC_MSI_IRQ_DOMAIN
 
 config IMGPDC_IRQ
         bool
@@ -244,12 +244,10 @@ config IRQ_MXS
 
 config MVEBU_ODMI
         bool
-        select GENERIC_MSI_IRQ_DOMAIN
 
 config LS_SCFG_MSI
         def_bool y if SOC_LS1021A || ARCH_LAYERSCAPE
         depends on PCI && PCI_MSI
-        select PCI_MSI_IRQ_DOMAIN
 
 config PARTITION_PERCPU
         bool
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 56389be5d08b..67f9916ff14d 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -25,7 +25,7 @@ config PCI_MSI
            If you don't know what to do here, say Y.
 
 config PCI_MSI_IRQ_DOMAIN
-        bool
+        def_bool ARM || ARM64 || X86
         depends on PCI_MSI
         select GENERIC_MSI_IRQ_DOMAIN
 
diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index 5d2374e4ee7f..80cfe2f0a580 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -3,8 +3,9 @@ menu "PCI host controller drivers"
 
 config PCI_DRA7XX
         bool "TI DRA7xx PCIe controller"
-        select PCIE_DW
         depends on OF && HAS_IOMEM && TI_PIPE3
+        depends on PCI_MSI_IRQ_DOMAIN
+        select PCIE_DW
         help
          Enables support for the PCIe controller in the DRA7xx SoC.  There
          are two instances of PCIe controller in DRA7xx.  This controller can
@@ -20,7 +21,7 @@ config PCI_MVEBU
 config PCIE_XILINX_NWL
         bool "NWL PCIe Core"
         depends on ARCH_ZYNQMP
-        select PCI_MSI_IRQ_DOMAIN if PCI_MSI
+        depends on PCI_MSI_IRQ_DOMAIN
         help
          Say 'Y' here if you want kernel support for Xilinx
          NWL PCIe controller. The controller can act as Root Port
@@ -29,6 +30,7 @@ config PCIE_XILINX_NWL
 
 config PCIE_DW_PLAT
         bool "Platform bus based DesignWare PCIe Controller"
+        depends on PCI_MSI_IRQ_DOMAIN
         select PCIE_DW
         ---help---
          This selects the DesignWare PCIe controller support. Select this if
@@ -40,16 +42,19 @@ config PCIE_DW_PLAT
 
 config PCIE_DW
         bool
+        depends on PCI_MSI_IRQ_DOMAIN
 
 config PCI_EXYNOS
         bool "Samsung Exynos PCIe controller"
         depends on SOC_EXYNOS5440
+        depends on PCI_MSI_IRQ_DOMAIN
         select PCIEPORTBUS
         select PCIE_DW
 
 config PCI_IMX6
         bool "Freescale i.MX6 PCIe controller"
         depends on SOC_IMX6Q
+        depends on PCI_MSI_IRQ_DOMAIN
         select PCIEPORTBUS
         select PCIE_DW
 
@@ -72,8 +77,7 @@ config PCI_RCAR_GEN2
 config PCIE_RCAR
         bool "Renesas R-Car PCIe controller"
         depends on ARCH_RENESAS || (ARM && COMPILE_TEST)
-        select PCI_MSI
-        select PCI_MSI_IRQ_DOMAIN
+        depends on PCI_MSI_IRQ_DOMAIN
         help
           Say Y here if you want PCIe controller support on R-Car SoCs.
 
@@ -92,6 +96,7 @@ config PCI_HOST_GENERIC
 config PCIE_SPEAR13XX
         bool "STMicroelectronics SPEAr PCIe controller"
         depends on ARCH_SPEAR13XX
+        depends on PCI_MSI_IRQ_DOMAIN
         select PCIEPORTBUS
         select PCIE_DW
         help
@@ -100,6 +105,7 @@ config PCIE_SPEAR13XX
 config PCI_KEYSTONE
         bool "TI Keystone PCIe controller"
         depends on ARCH_KEYSTONE
+        depends on PCI_MSI_IRQ_DOMAIN
         select PCIE_DW
         select PCIEPORTBUS
         help
@@ -120,7 +126,6 @@ config PCI_XGENE
         depends on ARCH_XGENE
         depends on OF
         select PCIEPORTBUS
-        select PCI_MSI_IRQ_DOMAIN if PCI_MSI
         help
           Say Y here if you want internal PCI support on APM X-Gene SoC.
           There are 5 internal PCIe ports available. Each port is GEN3 capable
@@ -128,7 +133,8 @@ config PCI_XGENE
 
 config PCI_XGENE_MSI
         bool "X-Gene v1 PCIe MSI feature"
-        depends on PCI_XGENE && PCI_MSI
+        depends on PCI_XGENE
+        depends on PCI_MSI_IRQ_DOMAIN
         default y
         help
           Say Y here if you want PCIe MSI support for the APM X-Gene v1 SoC.
@@ -137,6 +143,7 @@ config PCI_XGENE_MSI
 config PCI_LAYERSCAPE
         bool "Freescale Layerscape PCIe controller"
         depends on OF && (ARM || ARCH_LAYERSCAPE)
+        depends on PCI_MSI_IRQ_DOMAIN
         select PCIE_DW
         select MFD_SYSCON
         help
@@ -177,8 +184,7 @@ config PCIE_IPROC_BCMA
 config PCIE_IPROC_MSI
         bool "Broadcom iProc PCIe MSI support"
         depends on PCIE_IPROC_PLATFORM || PCIE_IPROC_BCMA
-        depends on PCI_MSI
-        select PCI_MSI_IRQ_DOMAIN
+        depends on PCI_MSI_IRQ_DOMAIN
         default ARCH_BCM_IPROC
         help
           Say Y here if you want to enable MSI support for Broadcom's iProc
@@ -195,8 +201,8 @@ config PCIE_ALTERA
 
 config PCIE_ALTERA_MSI
         bool "Altera PCIe MSI feature"
-        depends on PCIE_ALTERA && PCI_MSI
-        select PCI_MSI_IRQ_DOMAIN
+        depends on PCIE_ALTERA
+        depends on PCI_MSI_IRQ_DOMAIN
         help
           Say Y here if you want PCIe MSI support for the Altera FPGA.
           This MSI driver supports Altera MSI to GIC controller IP.
@@ -204,6 +210,7 @@ config PCIE_ALTERA_MSI
 config PCI_HISI
         depends on OF && ARM64
         bool "HiSilicon Hip05 and Hip06 SoCs PCIe controllers"
+        depends on PCI_MSI_IRQ_DOMAIN
         select PCIEPORTBUS
         select PCIE_DW
         help
@@ -213,6 +220,7 @@ config PCI_HISI
 config PCIE_QCOM
         bool "Qualcomm PCIe controller"
         depends on ARCH_QCOM && OF
+        depends on PCI_MSI_IRQ_DOMAIN
         select PCIE_DW
         select PCIEPORTBUS
         help
@@ -237,6 +245,7 @@ config PCI_HOST_THUNDER_ECAM
 config PCIE_ARMADA_8K
         bool "Marvell Armada-8K PCIe controller"
         depends on ARCH_MVEBU
+        depends on PCI_MSI_IRQ_DOMAIN
         select PCIE_DW
         select PCIEPORTBUS
         help