[v1] PCI: add CONFIG_MMU dependency

[RFC] PCI: add CONFIG_MMU dependency

Posted by Arnd Bergmann 10 months ago

From: Arnd Bergmann <arnd@arndb.de>

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@app.fastmail.com/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 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

Re: [RFC] PCI: add CONFIG_MMU dependency

Posted by Geert Uytterhoeven 10 months ago

Hi Arnd,

CC Gerg

On Mon, 7 Apr 2025 at 12:40, Arnd Bergmann <arnd@kernel.org> wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> 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@app.fastmail.com/
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Thanks for your patch!

> --- 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.

While having an MMU is a hardware feature, I consider disabling MMU
support software configuration.  So this change prevents people from
disabling MMU support on a system that has both a PCI bus and an MMU.
But other people may not agree, or care?

Gr{oetje,eeting}s,

                        Geert


--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [RFC] PCI: add CONFIG_MMU dependency

Posted by Thomas Zimmermann 10 months ago


Am 07.04.25 um 12:38 schrieb Arnd Bergmann:
> From: Arnd Bergmann <arnd@arndb.de>
>
> 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@app.fastmail.com/
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

For gpu/drm/

Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>

> ---
>   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

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

Re: [RFC] PCI: add CONFIG_MMU dependency

Posted by Martin K. Petersen 10 months ago

Arnd,

> 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.

Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> # SCSI

-- 
Martin K. Petersen

Re: [RFC] PCI: add CONFIG_MMU dependency

Posted by Jeff Hugo 10 months ago

On 4/7/2025 4:38 AM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> 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@app.fastmail.com/
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>   drivers/accel/qaic/Kconfig              | 1 -

For qaic:
Acked-by: Jeff Hugo <jeff.hugo@oss.qualcomm.com>