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authorChris Metcalf <cmetcalf@tilera.com>2012-06-15 15:23:06 -0400
committerChris Metcalf <cmetcalf@tilera.com>2012-07-18 16:40:17 -0400
commit41bb38fc5398ae878c799647f3c4b25374029afb (patch)
tree5d7e01bd4176db1241b801f83cf92f32231b8e8b /arch/tile/Kconfig
parenteef015c8aa74451f848307fe5f65485070533bbb (diff)
tile pci: enable IOMMU to support DMA for legacy devices
This change uses the TRIO IOMMU to map the PCI DMA space and physical memory at different addresses. We also now use the dma_mapping_ops to provide support for non-PCI DMA, PCIe DMA (64-bit) and legacy PCI DMA (32-bit). We use the kernel's software I/O TLB framework (i.e. bounce buffers) for the legacy 32-bit PCI device support since there are a limited number of TLB entries in the IOMMU and it is non-trivial to handle indexing, searching, matching, etc. For 32-bit devices the performance impact of bounce buffers should not be a concern. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile/Kconfig')
-rw-r--r--arch/tile/Kconfig18
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index 0ad771f7a7e..557e3a381ca 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig
@@ -3,6 +3,8 @@
config TILE
def_bool y
+ select HAVE_DMA_ATTRS
+ select HAVE_DMA_API_DEBUG
select HAVE_KVM if !TILEGX
select GENERIC_FIND_FIRST_BIT
select USE_GENERIC_SMP_HELPERS
@@ -79,6 +81,9 @@ config ARCH_DMA_ADDR_T_64BIT
config NEED_DMA_MAP_STATE
def_bool y
+config ARCH_HAS_DMA_SET_COHERENT_MASK
+ bool
+
config LOCKDEP_SUPPORT
def_bool y
@@ -215,6 +220,19 @@ config HIGHMEM
config ZONE_DMA
def_bool y
+config IOMMU_HELPER
+ bool
+
+config NEED_SG_DMA_LENGTH
+ bool
+
+config SWIOTLB
+ bool
+ default TILEGX
+ select IOMMU_HELPER
+ select NEED_SG_DMA_LENGTH
+ select ARCH_HAS_DMA_SET_COHERENT_MASK
+
# We do not currently support disabling NUMA.
config NUMA
bool # "NUMA Memory Allocation and Scheduler Support"