linux-kernel - Re: [PATCH 2/2] iommu/amd: Move Kconfig and Makefile bits down into amd directory

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Date:   Mon, 15 Jun 2020 19:16:50 +0700
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     Jerry Snitselaar <jsnitsel@...hat.com>,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc:     Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH 2/2] iommu/amd: Move Kconfig and Makefile bits down into
 amd directory

Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>

Thanks,
Suravee

On 6/13/20 6:11 AM, Jerry Snitselaar wrote:
> Move AMD Kconfig and Makefile bits down into the amd directory
> with the rest of the AMD specific files.
> 
> Cc: Joerg Roedel <joro@...tes.org>
> Cc: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> Signed-off-by: Jerry Snitselaar <jsnitsel@...hat.com>
> ---
>   drivers/iommu/Kconfig      | 45 +-------------------------------------
>   drivers/iommu/Makefile     |  5 +----
>   drivers/iommu/amd/Kconfig  | 44 +++++++++++++++++++++++++++++++++++++
>   drivers/iommu/amd/Makefile |  4 ++++
>   4 files changed, 50 insertions(+), 48 deletions(-)
>   create mode 100644 drivers/iommu/amd/Kconfig
>   create mode 100644 drivers/iommu/amd/Makefile
> 
> diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
> index b12d4ec124f6..78a8be0053b3 100644
> --- a/drivers/iommu/Kconfig
> +++ b/drivers/iommu/Kconfig
> @@ -132,50 +132,7 @@ config IOMMU_PGTABLES_L2
>   	def_bool y
>   	depends on MSM_IOMMU && MMU && SMP && CPU_DCACHE_DISABLE=n
>   
> -# AMD IOMMU support
> -config AMD_IOMMU
> -	bool "AMD IOMMU support"
> -	select SWIOTLB
> -	select PCI_MSI
> -	select PCI_ATS
> -	select PCI_PRI
> -	select PCI_PASID
> -	select IOMMU_API
> -	select IOMMU_IOVA
> -	select IOMMU_DMA
> -	depends on X86_64 && PCI && ACPI
> -	---help---
> -	  With this option you can enable support for AMD IOMMU hardware in
> -	  your system. An IOMMU is a hardware component which provides
> -	  remapping of DMA memory accesses from devices. With an AMD IOMMU you
> -	  can isolate the DMA memory of different devices and protect the
> -	  system from misbehaving device drivers or hardware.
> -
> -	  You can find out if your system has an AMD IOMMU if you look into
> -	  your BIOS for an option to enable it or if you have an IVRS ACPI
> -	  table.
> -
> -config AMD_IOMMU_V2
> -	tristate "AMD IOMMU Version 2 driver"
> -	depends on AMD_IOMMU
> -	select MMU_NOTIFIER
> -	---help---
> -	  This option enables support for the AMD IOMMUv2 features of the IOMMU
> -	  hardware. Select this option if you want to use devices that support
> -	  the PCI PRI and PASID interface.
> -
> -config AMD_IOMMU_DEBUGFS
> -	bool "Enable AMD IOMMU internals in DebugFS"
> -	depends on AMD_IOMMU && IOMMU_DEBUGFS
> -	---help---
> -	  !!!WARNING!!!  !!!WARNING!!!  !!!WARNING!!!  !!!WARNING!!!
> -
> -	  DO NOT ENABLE THIS OPTION UNLESS YOU REALLY, -REALLY- KNOW WHAT YOU ARE DOING!!!
> -	  Exposes AMD IOMMU device internals in DebugFS.
> -
> -	  This option is -NOT- intended for production environments, and should
> -	  not generally be enabled.
> -
> +source "drivers/iommu/amd/Kconfig"
>   source "drivers/iommu/intel/Kconfig"
>   
>   config IRQ_REMAP
> diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
> index 71dd2f382e78..f356bc12b1c7 100644
> --- a/drivers/iommu/Makefile
> +++ b/drivers/iommu/Makefile
> @@ -1,5 +1,5 @@
>   # SPDX-License-Identifier: GPL-2.0
> -obj-y += intel/
> +obj-y += amd/ intel/
>   obj-$(CONFIG_IOMMU_API) += iommu.o
>   obj-$(CONFIG_IOMMU_API) += iommu-traces.o
>   obj-$(CONFIG_IOMMU_API) += iommu-sysfs.o
> @@ -12,9 +12,6 @@ obj-$(CONFIG_IOASID) += ioasid.o
>   obj-$(CONFIG_IOMMU_IOVA) += iova.o
>   obj-$(CONFIG_OF_IOMMU)	+= of_iommu.o
>   obj-$(CONFIG_MSM_IOMMU) += msm_iommu.o
> -obj-$(CONFIG_AMD_IOMMU) += amd/iommu.o amd/init.o amd/quirks.o
> -obj-$(CONFIG_AMD_IOMMU_DEBUGFS) += amd/debugfs.o
> -obj-$(CONFIG_AMD_IOMMU_V2) += amd/iommu_v2.o
>   obj-$(CONFIG_ARM_SMMU) += arm_smmu.o
>   arm_smmu-objs += arm-smmu.o arm-smmu-impl.o arm-smmu-qcom.o
>   obj-$(CONFIG_ARM_SMMU_V3) += arm-smmu-v3.o
> diff --git a/drivers/iommu/amd/Kconfig b/drivers/iommu/amd/Kconfig
> new file mode 100644
> index 000000000000..1f061d91e0b8
> --- /dev/null
> +++ b/drivers/iommu/amd/Kconfig
> @@ -0,0 +1,44 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +# AMD IOMMU support
> +config AMD_IOMMU
> +	bool "AMD IOMMU support"
> +	select SWIOTLB
> +	select PCI_MSI
> +	select PCI_ATS
> +	select PCI_PRI
> +	select PCI_PASID
> +	select IOMMU_API
> +	select IOMMU_IOVA
> +	select IOMMU_DMA
> +	depends on X86_64 && PCI && ACPI
> +	help
> +	  With this option you can enable support for AMD IOMMU hardware in
> +	  your system. An IOMMU is a hardware component which provides
> +	  remapping of DMA memory accesses from devices. With an AMD IOMMU you
> +	  can isolate the DMA memory of different devices and protect the
> +	  system from misbehaving device drivers or hardware.
> +
> +	  You can find out if your system has an AMD IOMMU if you look into
> +	  your BIOS for an option to enable it or if you have an IVRS ACPI
> +	  table.
> +
> +config AMD_IOMMU_V2
> +	tristate "AMD IOMMU Version 2 driver"
> +	depends on AMD_IOMMU
> +	select MMU_NOTIFIER
> +	help
> +	  This option enables support for the AMD IOMMUv2 features of the IOMMU
> +	  hardware. Select this option if you want to use devices that support
> +	  the PCI PRI and PASID interface.
> +
> +config AMD_IOMMU_DEBUGFS
> +	bool "Enable AMD IOMMU internals in DebugFS"
> +	depends on AMD_IOMMU && IOMMU_DEBUGFS
> +	help
> +	  !!!WARNING!!!  !!!WARNING!!!  !!!WARNING!!!  !!!WARNING!!!
> +
> +	  DO NOT ENABLE THIS OPTION UNLESS YOU REALLY, -REALLY- KNOW WHAT YOU ARE DOING!!!
> +	  Exposes AMD IOMMU device internals in DebugFS.
> +
> +	  This option is -NOT- intended for production environments, and should
> +	  not generally be enabled.
> diff --git a/drivers/iommu/amd/Makefile b/drivers/iommu/amd/Makefile
> new file mode 100644
> index 000000000000..552f68ddcefd
> --- /dev/null
> +++ b/drivers/iommu/amd/Makefile
> @@ -0,0 +1,4 @@
> +# SPDX-License-Identifier: GPL-2.0
> +obj-$(CONFIG_AMD_IOMMU) += iommu.o init.o quirks.o
> +obj-$(CONFIG_AMD_IOMMU_DEBUGFS) += debugfs.o
> +obj-$(CONFIG_AMD_IOMMU_V2) += iommu_v2.o
>