| Message ID | 2e33c8bc2b1bb478157b7964bfed976cb7466139.1660668998.git.robin.murphy@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | iommu/dma: Some housekeeping | expand |
On Tue, Aug 16, 2022 at 06:28:03PM +0100, Robin Murphy wrote: > Although iommu-dma is a per-architecture chonce, that is currently > implemented in a rather haphazard way. Selecting from the arch Kconfig > was the original logical approach, but is complicated by having to > manage dependencies; conversely, selecting from drivers ends up hiding > the architecture dependency *too* well. Instead, let's just have it > enable itself automatically when IOMMU API support is enabled for the > relevant architectures. It can't get much clearer than that. > > Signed-off-by: Robin Murphy <robin.murphy@arm.com> > --- > arch/arm64/Kconfig | 1 - For this change: Acked-by: Catalin Marinas <catalin.marinas@arm.com>
On Tue, Aug 16, 2022 at 06:28:03PM +0100, Robin Murphy wrote: > Although iommu-dma is a per-architecture chonce, that is currently > implemented in a rather haphazard way. Selecting from the arch Kconfig > was the original logical approach, but is complicated by having to > manage dependencies; conversely, selecting from drivers ends up hiding > the architecture dependency *too* well. Instead, let's just have it > enable itself automatically when IOMMU API support is enabled for the > relevant architectures. It can't get much clearer than that. > > Signed-off-by: Robin Murphy <robin.murphy@arm.com> > --- > arch/arm64/Kconfig | 1 - > drivers/iommu/Kconfig | 3 +-- > drivers/iommu/amd/Kconfig | 1 - > drivers/iommu/intel/Kconfig | 1 - > 4 files changed, 1 insertion(+), 5 deletions(-) > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index 571cc234d0b3..59af600445c2 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -209,7 +209,6 @@ config ARM64 > select HAVE_KPROBES > select HAVE_KRETPROBES > select HAVE_GENERIC_VDSO > - select IOMMU_DMA if IOMMU_SUPPORT > select IRQ_DOMAIN > select IRQ_FORCED_THREADING > select KASAN_VMALLOC if KASAN > diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig > index 5c5cb5bee8b6..1d99c2d984fb 100644 > --- a/drivers/iommu/Kconfig > +++ b/drivers/iommu/Kconfig > @@ -137,7 +137,7 @@ config OF_IOMMU > > # IOMMU-agnostic DMA-mapping layer > config IOMMU_DMA > - bool > + def_bool ARM64 || IA64 || X86 Robin, do you remember why you added IA64 here? What is the Itanimum IOMMU driver? Thanks, Jason
On 2023-05-05 15:50, Jason Gunthorpe wrote: > On Tue, Aug 16, 2022 at 06:28:03PM +0100, Robin Murphy wrote: >> Although iommu-dma is a per-architecture chonce, that is currently >> implemented in a rather haphazard way. Selecting from the arch Kconfig >> was the original logical approach, but is complicated by having to >> manage dependencies; conversely, selecting from drivers ends up hiding >> the architecture dependency *too* well. Instead, let's just have it >> enable itself automatically when IOMMU API support is enabled for the >> relevant architectures. It can't get much clearer than that. >> >> Signed-off-by: Robin Murphy <robin.murphy@arm.com> >> --- >> arch/arm64/Kconfig | 1 - >> drivers/iommu/Kconfig | 3 +-- >> drivers/iommu/amd/Kconfig | 1 - >> drivers/iommu/intel/Kconfig | 1 - >> 4 files changed, 1 insertion(+), 5 deletions(-) >> >> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig >> index 571cc234d0b3..59af600445c2 100644 >> --- a/arch/arm64/Kconfig >> +++ b/arch/arm64/Kconfig >> @@ -209,7 +209,6 @@ config ARM64 >> select HAVE_KPROBES >> select HAVE_KRETPROBES >> select HAVE_GENERIC_VDSO >> - select IOMMU_DMA if IOMMU_SUPPORT >> select IRQ_DOMAIN >> select IRQ_FORCED_THREADING >> select KASAN_VMALLOC if KASAN >> diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig >> index 5c5cb5bee8b6..1d99c2d984fb 100644 >> --- a/drivers/iommu/Kconfig >> +++ b/drivers/iommu/Kconfig >> @@ -137,7 +137,7 @@ config OF_IOMMU >> >> # IOMMU-agnostic DMA-mapping layer >> config IOMMU_DMA >> - bool >> + def_bool ARM64 || IA64 || X86 > > Robin, do you remember why you added IA64 here? What is the Itanimum > IOMMU driver? config INTEL_IOMMU bool "Support for Intel IOMMU using DMA Remapping Devices" depends on PCI_MSI && ACPI && (X86 || IA64) Yes, really :) Robin.
On Fri, May 05, 2023 at 03:53:54PM +0100, Robin Murphy wrote: > > > diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig > > > index 5c5cb5bee8b6..1d99c2d984fb 100644 > > > --- a/drivers/iommu/Kconfig > > > +++ b/drivers/iommu/Kconfig > > > @@ -137,7 +137,7 @@ config OF_IOMMU > > > # IOMMU-agnostic DMA-mapping layer > > > config IOMMU_DMA > > > - bool > > > + def_bool ARM64 || IA64 || X86 > > > > Robin, do you remember why you added IA64 here? What is the Itanimum > > IOMMU driver? > > config INTEL_IOMMU > bool "Support for Intel IOMMU using DMA Remapping Devices" > depends on PCI_MSI && ACPI && (X86 || IA64) > > Yes, really :) Wowo, thanks! Jason
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 571cc234d0b3..59af600445c2 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -209,7 +209,6 @@ config ARM64 select HAVE_KPROBES select HAVE_KRETPROBES select HAVE_GENERIC_VDSO - select IOMMU_DMA if IOMMU_SUPPORT select IRQ_DOMAIN select IRQ_FORCED_THREADING select KASAN_VMALLOC if KASAN diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index 5c5cb5bee8b6..1d99c2d984fb 100644 --- a/drivers/iommu/Kconfig +++ b/drivers/iommu/Kconfig @@ -137,7 +137,7 @@ config OF_IOMMU # IOMMU-agnostic DMA-mapping layer config IOMMU_DMA - bool + def_bool ARM64 || IA64 || X86 select DMA_OPS select IOMMU_API select IOMMU_IOVA @@ -476,7 +476,6 @@ config VIRTIO_IOMMU depends on VIRTIO depends on (ARM64 || X86) select IOMMU_API - select IOMMU_DMA select INTERVAL_TREE select ACPI_VIOT if ACPI help diff --git a/drivers/iommu/amd/Kconfig b/drivers/iommu/amd/Kconfig index a3cbafb603f5..9b5fc3356bf2 100644 --- a/drivers/iommu/amd/Kconfig +++ b/drivers/iommu/amd/Kconfig @@ -9,7 +9,6 @@ config AMD_IOMMU select PCI_PASID select IOMMU_API select IOMMU_IOVA - select IOMMU_DMA select IOMMU_IO_PGTABLE depends on X86_64 && PCI && ACPI && HAVE_CMPXCHG_DOUBLE help diff --git a/drivers/iommu/intel/Kconfig b/drivers/iommu/intel/Kconfig index 39a06d245f12..c48005147ac5 100644 --- a/drivers/iommu/intel/Kconfig +++ b/drivers/iommu/intel/Kconfig @@ -19,7 +19,6 @@ config INTEL_IOMMU select DMAR_TABLE select SWIOTLB select IOASID - select IOMMU_DMA select PCI_ATS help DMA remapping (DMAR) devices support enables independent address
Although iommu-dma is a per-architecture chonce, that is currently implemented in a rather haphazard way. Selecting from the arch Kconfig was the original logical approach, but is complicated by having to manage dependencies; conversely, selecting from drivers ends up hiding the architecture dependency *too* well. Instead, let's just have it enable itself automatically when IOMMU API support is enabled for the relevant architectures. It can't get much clearer than that. Signed-off-by: Robin Murphy <robin.murphy@arm.com> --- arch/arm64/Kconfig | 1 - drivers/iommu/Kconfig | 3 +-- drivers/iommu/amd/Kconfig | 1 - drivers/iommu/intel/Kconfig | 1 - 4 files changed, 1 insertion(+), 5 deletions(-)