diff options
| author | Olof Johansson <olof@lixom.net> | 2007-10-03 13:03:54 -0500 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-10-10 16:54:30 -0700 |
| commit | af289e803fdf2fcd19cf4a57c3c896dba146c756 (patch) | |
| tree | 038fe6e9a32ed958450bf0bd33227a3c23342ae8 /arch/powerpc | |
| parent | 9ddf7774b9d760dc3fa4d5ae7d7fd92d4c02150b (diff) | |
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 <olof@lixom.net>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/platforms/pasemi/Kconfig | 10 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pasemi/iommu.c | 15 |
2 files changed, 20 insertions, 5 deletions
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 <asm/iommu.h> #include <asm/machdep.h> #include <asm/abs_addr.h> +#include <asm/firmware.h> #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) { } |