iommu: msm: enable lazy mapping for waipio

Enable the "lazy mapping" feature, which lets dma_bufs be unmapped
lazily when the DMA_ATTR_DELAYED_UNMAP attribute is used for a
buffer.

Change-Id: I28771db8449f78cfc89eaac0b67db914f055dba6
Signed-off-by: Chris Goldsworthy <cgoldswo@codeaurora.org>

drivers/iommu/Kconfig

@@ -442,6 +442,18 @@ config ARM_SMMU_V3
 	  Say Y here if your system includes an IOMMU device implementing
 	  the ARM SMMUv3 architecture.
 
+config QCOM_LAZY_MAPPING
+	tristate "Reference counted iommu-mapping support"
+	depends on ION
+	depends on IOMMU_API
+	help
+	  ION buffers may be shared between several software clients.
+	  Reference counting the mapping may simplify coordination between
+	  these clients, and decrease latency by preventing multiple
+	  map/unmaps of the same region.
+
+	  If unsure, say N here.
+
 config S390_IOMMU
 	def_bool y if S390 && PCI
 	depends on S390 && PCI

drivers/iommu/Makefile

@@ -4,6 +4,7 @@ obj-$(CONFIG_IOMMU_API) += iommu-traces.o
 obj-$(CONFIG_IOMMU_API) += iommu-sysfs.o
 obj-$(CONFIG_IOMMU_DEBUGFS) += iommu-debugfs.o
 obj-$(CONFIG_IOMMU_DMA) += dma-iommu.o
+obj-$(CONFIG_QCOM_LAZY_MAPPING) += msm_dma_iommu_mapping.o
 obj-$(CONFIG_IOMMU_IO_PGTABLE) += io-pgtable.o
 obj-$(CONFIG_IOMMU_IO_PGTABLE_ARMV7S) += io-pgtable-arm-v7s.o
 obj-$(CONFIG_IOMMU_IO_PGTABLE_LPAE) += io-pgtable-arm.o

modules.list.msm.lahaina

@@ -24,6 +24,7 @@ qcom-pdc.ko
 iommu-logger.ko
 arm_smmu.ko
 msm_ion_heaps.ko
+msm_dma_iommu_mapping.ko
 qcom-arm-smmu-mod.ko
 #phy-qcom-ufs.ko
 #phy-qcom-ufs-qmp-v4-lahaina.ko

modules.list.msm.waipio

@@ -24,3 +24,4 @@ usb_f_mass_storage.ko
 msm-geni-se.ko
 msm_geni_serial.ko
 msm_ion_heaps.ko
+msm_dma_iommu_mapping.ko