Merge tag 'dmaengine-4.9-rc1' of git://git.infradead.org/users/vkoul/slave-dma

Pull dmaengine updates from Vinod Koul:
 "This is bit large pile of code which bring in some nice additions:

   - Error reporting: we have added a new mechanism for users of
     dmaenegine to register a callback_result which tells them the
     result of the dma transaction. Right now only one user (ntb) is
     using it.

   - As we discussed on KS mailing list and pointed out NO_IRQ has no
     place in kernel, this also remove NO_IRQ from dmaengine subsystem
     (both arm and ppc users)

   - Support for IOMMU slave transfers and its implementation for arm.

   - To get better build coverage, enable COMPILE_TEST for bunch of
     driver, and fix the warning and sparse complaints on these.

   - Apart from above, usual updates spread across drivers"

* tag 'dmaengine-4.9-rc1' of git://git.infradead.org/users/vkoul/slave-dma: (169 commits)
  async_pq_val: fix DMA memory leak
  dmaengine: virt-dma: move function declarations
  dmaengine: omap-dma: Enable burst and data pack for SG
  DT: dmaengine: rcar-dmac: document R8A7743/5 support
  dmaengine: fsldma: Unmap region obtained by of_iomap
  dmaengine: jz4780: fix resource leaks on error exit return
  dma-debug: fix ia64 build, use PHYS_PFN
  dmaengine: coh901318: fix integer overflow when shifting more than 32 places
  dmaengine: edma: avoid uninitialized variable use
  dma-mapping: fix m32r build warning
  dma-mapping: fix ia64 build, use PHYS_PFN
  dmaengine: ti-dma-crossbar: enable COMPILE_TEST
  dmaengine: omap-dma: enable COMPILE_TEST
  dmaengine: edma: enable COMPILE_TEST
  dmaengine: ti-dma-crossbar: Fix of_device_id data parameter usage
  dmaengine: ti-dma-crossbar: Correct type for of_find_property() third parameter
  dmaengine/ARM: omap-dma: Fix the DMAengine compile test on non OMAP configs
  dmaengine: edma: Rename set_bits and remove unused clear_bits helper
  dmaengine: edma: Use correct type for of_find_property() third parameter
  dmaengine: edma: Fix of_device_id data parameter usage (legacy vs TPCC)
  ...

1 files changed, 63 insertions, 0 deletions

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index a2302aba5df2..ab4f74536057 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -2014,6 +2014,63 @@ static void arm_iommu_unmap_page(struct device *dev, dma_addr_t handle,
         __free_iova(mapping, iova, len);
 }
 
+/**
+ * arm_iommu_map_resource - map a device resource for DMA
+ * @dev: valid struct device pointer
+ * @phys_addr: physical address of resource
+ * @size: size of resource to map
+ * @dir: DMA transfer direction
+ */
+static dma_addr_t arm_iommu_map_resource(struct device *dev,
+                phys_addr_t phys_addr, size_t size,
+                enum dma_data_direction dir, unsigned long attrs)
+{
+        struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
+        dma_addr_t dma_addr;
+        int ret, prot;
+        phys_addr_t addr = phys_addr & PAGE_MASK;
+        unsigned int offset = phys_addr & ~PAGE_MASK;
+        size_t len = PAGE_ALIGN(size + offset);
+
+        dma_addr = __alloc_iova(mapping, len);
+        if (dma_addr == DMA_ERROR_CODE)
+                return dma_addr;
+
+        prot = __dma_direction_to_prot(dir) | IOMMU_MMIO;
+
+        ret = iommu_map(mapping->domain, dma_addr, addr, len, prot);
+        if (ret < 0)
+                goto fail;
+
+        return dma_addr + offset;
+fail:
+        __free_iova(mapping, dma_addr, len);
+        return DMA_ERROR_CODE;
+}
+
+/**
+ * arm_iommu_unmap_resource - unmap a device DMA resource
+ * @dev: valid struct device pointer
+ * @dma_handle: DMA address to resource
+ * @size: size of resource to map
+ * @dir: DMA transfer direction
+ */
+static void arm_iommu_unmap_resource(struct device *dev, dma_addr_t dma_handle,
+                size_t size, enum dma_data_direction dir,
+                unsigned long attrs)
+{
+        struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
+        dma_addr_t iova = dma_handle & PAGE_MASK;
+        unsigned int offset = dma_handle & ~PAGE_MASK;
+        size_t len = PAGE_ALIGN(size + offset);
+
+        if (!iova)
+                return;
+
+        iommu_unmap(mapping->domain, iova, len);
+        __free_iova(mapping, iova, len);
+}
+
 static void arm_iommu_sync_single_for_cpu(struct device *dev,
                 dma_addr_t handle, size_t size, enum dma_data_direction dir)
 {
@@ -2057,6 +2114,9 @@ struct dma_map_ops iommu_ops = {
         .unmap_sg               = arm_iommu_unmap_sg,
         .sync_sg_for_cpu        = arm_iommu_sync_sg_for_cpu,
         .sync_sg_for_device     = arm_iommu_sync_sg_for_device,
+
+        .map_resource           = arm_iommu_map_resource,
+        .unmap_resource         = arm_iommu_unmap_resource,
 };
 
 struct dma_map_ops iommu_coherent_ops = {
@@ -2070,6 +2130,9 @@ struct dma_map_ops iommu_coherent_ops = {
 
         .map_sg         = arm_coherent_iommu_map_sg,
         .unmap_sg       = arm_coherent_iommu_unmap_sg,
+
+        .map_resource   = arm_iommu_map_resource,
+        .unmap_resource = arm_iommu_unmap_resource,
 };
 
 /**