[RFC] PCI: add CONFIG_MMU dependency

From: Arnd Bergmann
Date: Mon Apr 07 2025 - 06:41:05 EST

From: Arnd Bergmann <arnd@xxxxxxxx>

It turns out that there are no platforms that have PCI but don't have an MMU,
so adding a Kconfig dependency on CONFIG_PCI simplifies build testing kernels
for those platforms a lot, and avoids a lot of inadvertent build regressions.

Add a dependency for CONFIG_PCI and remove all the ones for PCI specific
device drivers that are currently marked not having it.

Link: https://lore.kernel.org/lkml/a41f1b20-a76c-43d8-8c36-f12744327a54@xxxxxxxxxxxxxxxx/
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
drivers/accel/qaic/Kconfig | 1 -
drivers/firewire/Kconfig | 2 +-
drivers/gpu/drm/Kconfig | 2 +-
drivers/gpu/drm/amd/amdgpu/Kconfig | 3 +--
drivers/gpu/drm/ast/Kconfig | 2 +-
drivers/gpu/drm/gma500/Kconfig | 2 +-
drivers/gpu/drm/hisilicon/hibmc/Kconfig | 1 -
drivers/gpu/drm/loongson/Kconfig | 2 +-
drivers/gpu/drm/mgag200/Kconfig | 2 +-
drivers/gpu/drm/nouveau/Kconfig | 3 +--
drivers/gpu/drm/qxl/Kconfig | 2 +-
drivers/gpu/drm/radeon/Kconfig | 2 +-
drivers/gpu/drm/tiny/Kconfig | 2 +-
drivers/gpu/drm/vmwgfx/Kconfig | 2 +-
drivers/gpu/drm/xe/Kconfig | 2 +-
drivers/net/ethernet/broadcom/Kconfig | 1 -
drivers/pci/Kconfig | 1 +
drivers/pci/pci.c | 4 ++--
drivers/scsi/bnx2fc/Kconfig | 1 -
drivers/scsi/bnx2i/Kconfig | 1 -
drivers/vfio/pci/Kconfig | 2 +-
21 files changed, 17 insertions(+), 23 deletions(-)

diff --git a/drivers/accel/qaic/Kconfig b/drivers/accel/qaic/Kconfig
index a9f866230058..5e405a19c157 100644
--- a/drivers/accel/qaic/Kconfig
+++ b/drivers/accel/qaic/Kconfig
@@ -8,7 +8,6 @@ config DRM_ACCEL_QAIC
depends on DRM_ACCEL
depends on PCI && HAS_IOMEM
depends on MHI_BUS
- depends on MMU
select CRC32
help
Enables driver for Qualcomm's Cloud AI accelerator PCIe cards that are
diff --git a/drivers/firewire/Kconfig b/drivers/firewire/Kconfig
index 905c82e26ce7..a5f5e250223a 100644
--- a/drivers/firewire/Kconfig
+++ b/drivers/firewire/Kconfig
@@ -83,7 +83,7 @@ config FIREWIRE_KUNIT_SELF_ID_SEQUENCE_HELPER_TEST

config FIREWIRE_OHCI
tristate "OHCI-1394 controllers"
- depends on PCI && FIREWIRE && MMU
+ depends on PCI && FIREWIRE
help
Enable this driver if you have a FireWire controller based
on the OHCI specification. For all practical purposes, this
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 2cba2b6ebe1c..6e95d204597e 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -462,7 +462,7 @@ source "drivers/gpu/drm/imagination/Kconfig"

config DRM_HYPERV
tristate "DRM Support for Hyper-V synthetic video device"
- depends on DRM && PCI && MMU && HYPERV
+ depends on DRM && PCI && HYPERV
select DRM_CLIENT_SELECTION
select DRM_KMS_HELPER
select DRM_GEM_SHMEM_HELPER
diff --git a/drivers/gpu/drm/amd/amdgpu/Kconfig b/drivers/gpu/drm/amd/amdgpu/Kconfig
index 1a11cab741ac..058e3b3ad520 100644
--- a/drivers/gpu/drm/amd/amdgpu/Kconfig
+++ b/drivers/gpu/drm/amd/amdgpu/Kconfig
@@ -2,7 +2,7 @@

config DRM_AMDGPU
tristate "AMD GPU"
- depends on DRM && PCI && MMU
+ depends on DRM && PCI
depends on !UML
select FW_LOADER
select DRM_CLIENT
@@ -68,7 +68,6 @@ config DRM_AMDGPU_CIK
config DRM_AMDGPU_USERPTR
bool "Always enable userptr write support"
depends on DRM_AMDGPU
- depends on MMU
select HMM_MIRROR
select MMU_NOTIFIER
help
diff --git a/drivers/gpu/drm/ast/Kconfig b/drivers/gpu/drm/ast/Kconfig
index da0663542e8a..242fbccdf844 100644
--- a/drivers/gpu/drm/ast/Kconfig
+++ b/drivers/gpu/drm/ast/Kconfig
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0-only
config DRM_AST
tristate "AST server chips"
- depends on DRM && PCI && MMU
+ depends on DRM && PCI
select DRM_CLIENT_SELECTION
select DRM_GEM_SHMEM_HELPER
select DRM_KMS_HELPER
diff --git a/drivers/gpu/drm/gma500/Kconfig b/drivers/gpu/drm/gma500/Kconfig
index aa2ea128aa2f..a2acaa699dd5 100644
--- a/drivers/gpu/drm/gma500/Kconfig
+++ b/drivers/gpu/drm/gma500/Kconfig
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0-only
config DRM_GMA500
tristate "Intel GMA500/600/3600/3650 KMS Framebuffer"
- depends on DRM && PCI && X86 && MMU && HAS_IOPORT
+ depends on DRM && PCI && X86 && HAS_IOPORT
select DRM_CLIENT_SELECTION
select DRM_KMS_HELPER
select FB_IOMEM_HELPERS if DRM_FBDEV_EMULATION
diff --git a/drivers/gpu/drm/hisilicon/hibmc/Kconfig b/drivers/gpu/drm/hisilicon/hibmc/Kconfig
index 98d77d74999d..d1f3f5793f34 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/Kconfig
+++ b/drivers/gpu/drm/hisilicon/hibmc/Kconfig
@@ -2,7 +2,6 @@
config DRM_HISI_HIBMC
tristate "DRM Support for Hisilicon Hibmc"
depends on DRM && PCI
- depends on MMU
select DRM_CLIENT_SELECTION
select DRM_DISPLAY_HELPER
select DRM_DISPLAY_DP_HELPER
diff --git a/drivers/gpu/drm/loongson/Kconfig b/drivers/gpu/drm/loongson/Kconfig
index 552edfec7afb..d739d51cf54c 100644
--- a/drivers/gpu/drm/loongson/Kconfig
+++ b/drivers/gpu/drm/loongson/Kconfig
@@ -2,7 +2,7 @@

config DRM_LOONGSON
tristate "DRM support for Loongson Graphics"
- depends on DRM && PCI && MMU
+ depends on DRM && PCI
depends on LOONGARCH || MIPS || COMPILE_TEST
select DRM_CLIENT_SELECTION
select DRM_KMS_HELPER
diff --git a/drivers/gpu/drm/mgag200/Kconfig b/drivers/gpu/drm/mgag200/Kconfig
index 412dcbea0e2d..a962ae564a75 100644
--- a/drivers/gpu/drm/mgag200/Kconfig
+++ b/drivers/gpu/drm/mgag200/Kconfig
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0-only
config DRM_MGAG200
tristate "Matrox G200"
- depends on DRM && PCI && MMU
+ depends on DRM && PCI
select DRM_CLIENT_SELECTION
select DRM_GEM_SHMEM_HELPER
select DRM_KMS_HELPER
diff --git a/drivers/gpu/drm/nouveau/Kconfig b/drivers/gpu/drm/nouveau/Kconfig
index 7b3e979c51ec..d1587639ebb0 100644
--- a/drivers/gpu/drm/nouveau/Kconfig
+++ b/drivers/gpu/drm/nouveau/Kconfig
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0-only
config DRM_NOUVEAU
tristate "Nouveau (NVIDIA) cards"
- depends on DRM && PCI && MMU
+ depends on DRM && PCI
select IOMMU_API
select FW_LOADER
select FW_CACHE if PM_SLEEP
@@ -94,7 +94,6 @@ config DRM_NOUVEAU_SVM
bool "(EXPERIMENTAL) Enable SVM (Shared Virtual Memory) support"
depends on DEVICE_PRIVATE
depends on DRM_NOUVEAU
- depends on MMU
depends on STAGING
select HMM_MIRROR
select MMU_NOTIFIER
diff --git a/drivers/gpu/drm/qxl/Kconfig b/drivers/gpu/drm/qxl/Kconfig
index 69427eb8bed2..d8f24bcae34b 100644
--- a/drivers/gpu/drm/qxl/Kconfig
+++ b/drivers/gpu/drm/qxl/Kconfig
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0-only
config DRM_QXL
tristate "QXL virtual GPU"
- depends on DRM && PCI && MMU && HAS_IOPORT
+ depends on DRM && PCI && HAS_IOPORT
select DRM_CLIENT_SELECTION
select DRM_KMS_HELPER
select DRM_TTM
diff --git a/drivers/gpu/drm/radeon/Kconfig b/drivers/gpu/drm/radeon/Kconfig
index f51bace9555d..c479f0c0dd5c 100644
--- a/drivers/gpu/drm/radeon/Kconfig
+++ b/drivers/gpu/drm/radeon/Kconfig
@@ -2,7 +2,7 @@

config DRM_RADEON
tristate "ATI Radeon"
- depends on DRM && PCI && MMU
+ depends on DRM && PCI
depends on AGP || !AGP
select FW_LOADER
select DRM_CLIENT_SELECTION
diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig
index 54c84c9801c1..6ca12fe7f57a 100644
--- a/drivers/gpu/drm/tiny/Kconfig
+++ b/drivers/gpu/drm/tiny/Kconfig
@@ -37,7 +37,7 @@ config DRM_BOCHS

config DRM_CIRRUS_QEMU
tristate "Cirrus driver for QEMU emulated device"
- depends on DRM && PCI && MMU
+ depends on DRM && PCI
select DRM_CLIENT_SELECTION
select DRM_KMS_HELPER
select DRM_GEM_SHMEM_HELPER
diff --git a/drivers/gpu/drm/vmwgfx/Kconfig b/drivers/gpu/drm/vmwgfx/Kconfig
index 6c3c2922ae8b..aab646b91ca9 100644
--- a/drivers/gpu/drm/vmwgfx/Kconfig
+++ b/drivers/gpu/drm/vmwgfx/Kconfig
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
config DRM_VMWGFX
tristate "DRM driver for VMware Virtual GPU"
- depends on DRM && PCI && MMU
+ depends on DRM && PCI
depends on (X86 && HYPERVISOR_GUEST) || ARM64
select DRM_CLIENT_SELECTION
select DRM_TTM
diff --git a/drivers/gpu/drm/xe/Kconfig b/drivers/gpu/drm/xe/Kconfig
index 5c2f459a2925..2dec62737ff6 100644
--- a/drivers/gpu/drm/xe/Kconfig
+++ b/drivers/gpu/drm/xe/Kconfig
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0-only
config DRM_XE
tristate "Intel Xe Graphics"
- depends on DRM && PCI && MMU && (m || (y && KUNIT=y))
+ depends on DRM && PCI && (m || (y && KUNIT=y))
select INTERVAL_TREE
# we need shmfs for the swappable backing store, and in particular
# the shmem_readpage() which depends upon tmpfs
diff --git a/drivers/net/ethernet/broadcom/Kconfig b/drivers/net/ethernet/broadcom/Kconfig
index eeec8bf17cf4..aa43984a05cf 100644
--- a/drivers/net/ethernet/broadcom/Kconfig
+++ b/drivers/net/ethernet/broadcom/Kconfig
@@ -96,7 +96,6 @@ config BNX2
config CNIC
tristate "QLogic CNIC support"
depends on PCI && (IPV6 || IPV6=n)
- depends on MMU
select BNX2
select UIO
help
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index da28295b4aac..9c0e4aaf4e8c 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -21,6 +21,7 @@ config GENERIC_PCI_IOMAP
menuconfig PCI
bool "PCI support"
depends on HAVE_PCI
+ depends on MMU
help
This option enables support for the PCI local bus, including
support for PCI-X and the foundations for PCI Express support.
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 4d7c9f64ea24..60a20a0ac41f 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4257,7 +4257,7 @@ unsigned long __weak pci_address_to_pio(phys_addr_t address)
#ifndef pci_remap_iospace
int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr)
{
-#if defined(PCI_IOBASE) && defined(CONFIG_MMU)
+#if defined(PCI_IOBASE)
unsigned long vaddr = (unsigned long)PCI_IOBASE + res->start;

if (!(res->flags & IORESOURCE_IO))
@@ -4290,7 +4290,7 @@ EXPORT_SYMBOL(pci_remap_iospace);
*/
void pci_unmap_iospace(struct resource *res)
{
-#if defined(PCI_IOBASE) && defined(CONFIG_MMU)
+#if defined(PCI_IOBASE)
unsigned long vaddr = (unsigned long)PCI_IOBASE + res->start;

vunmap_range(vaddr, vaddr + resource_size(res));
diff --git a/drivers/scsi/bnx2fc/Kconfig b/drivers/scsi/bnx2fc/Kconfig
index ecdc0f0f4f4e..3cf7e08df809 100644
--- a/drivers/scsi/bnx2fc/Kconfig
+++ b/drivers/scsi/bnx2fc/Kconfig
@@ -5,7 +5,6 @@ config SCSI_BNX2X_FCOE
depends on (IPV6 || IPV6=n)
depends on LIBFC
depends on LIBFCOE
- depends on MMU
select NETDEVICES
select ETHERNET
select NET_VENDOR_BROADCOM
diff --git a/drivers/scsi/bnx2i/Kconfig b/drivers/scsi/bnx2i/Kconfig
index 0cc06c2ce0b8..75ace2302fed 100644
--- a/drivers/scsi/bnx2i/Kconfig
+++ b/drivers/scsi/bnx2i/Kconfig
@@ -4,7 +4,6 @@ config SCSI_BNX2_ISCSI
depends on NET
depends on PCI
depends on (IPV6 || IPV6=n)
- depends on MMU
select SCSI_ISCSI_ATTRS
select NETDEVICES
select ETHERNET
diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig
index c3bcb6911c53..2b0172f54665 100644
--- a/drivers/vfio/pci/Kconfig
+++ b/drivers/vfio/pci/Kconfig
@@ -1,6 +1,6 @@
# SPDX-License-Identifier: GPL-2.0-only
menu "VFIO support for PCI devices"
- depends on PCI && MMU
+ depends on PCI

config VFIO_PCI_CORE
tristate
--
2.39.5