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>
diff --git a/arch/powerpc/platforms/pasemi/iommu.c b/arch/powerpc/platforms/pasemi/iommu.c
index 9014d55..a1111b5 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 @@
{
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) { }