From af289e803fdf2fcd19cf4a57c3c896dba146c756 Mon Sep 17 00:00:00 2001 From: Olof Johansson Date: Wed, 3 Oct 2007 13:03:54 -0500 Subject: pasemi_mac: enable iommu support pasemi_mac: enable iommu support Enable IOMMU support for pasemi_mac, but avoid using it on non-partitioned systems for performance reasons. The user can override this by selecting the PPC_PASEMI_IOMMU_DMA_FORCE configuration option. Signed-off-by: Olof Johansson Signed-off-by: Jeff Garzik --- arch/powerpc/platforms/pasemi/Kconfig | 10 ++++++++++ arch/powerpc/platforms/pasemi/iommu.c | 15 ++++++++++----- 2 files changed, 20 insertions(+), 5 deletions(-) (limited to 'arch/powerpc/platforms') diff --git a/arch/powerpc/platforms/pasemi/Kconfig b/arch/powerpc/platforms/pasemi/Kconfig index 95cd90fd81c7..e95261ef6f98 100644 --- a/arch/powerpc/platforms/pasemi/Kconfig +++ b/arch/powerpc/platforms/pasemi/Kconfig @@ -18,6 +18,16 @@ config PPC_PASEMI_IOMMU help IOMMU support for PA6T-1682M +config PPC_PASEMI_IOMMU_DMA_FORCE + bool "Force DMA engine to use IOMMU" + depends on PPC_PASEMI_IOMMU + help + This option forces the use of the IOMMU also for the + DMA engine. Otherwise the kernel will use it only when + running under a hypervisor. + + If in doubt, say "N". + config PPC_PASEMI_MDIO depends on PHYLIB tristate "MDIO support via GPIO" diff --git a/arch/powerpc/platforms/pasemi/iommu.c b/arch/powerpc/platforms/pasemi/iommu.c index 9014d55c717b..a1111b5c6cb4 100644 --- a/arch/powerpc/platforms/pasemi/iommu.c +++ b/arch/powerpc/platforms/pasemi/iommu.c @@ -25,6 +25,7 @@ #include #include #include +#include #define IOBMAP_PAGE_SHIFT 12 @@ -175,13 +176,17 @@ static void pci_dma_dev_setup_pasemi(struct pci_dev *dev) { pr_debug("pci_dma_dev_setup, dev %p (%s)\n", dev, pci_name(dev)); - /* DMA device is untranslated, but all other PCI-e goes through - * the IOMMU +#if !defined(CONFIG_PPC_PASEMI_IOMMU_DMA_FORCE) + /* For non-LPAR environment, don't translate anything for the DMA + * engine. The exception to this is if the user has enabled + * CONFIG_PPC_PASEMI_IOMMU_DMA_FORCE at build time. */ - if (dev->vendor == 0x1959 && dev->device == 0xa007) + if (dev->vendor == 0x1959 && dev->device == 0xa007 && + !firmware_has_feature(FW_FEATURE_LPAR)) dev->dev.archdata.dma_ops = &dma_direct_ops; - else - dev->dev.archdata.dma_data = &iommu_table_iobmap; +#endif + + dev->dev.archdata.dma_data = &iommu_table_iobmap; } static void pci_dma_bus_setup_null(struct pci_bus *b) { } -- cgit v1.2.3