v4.19.13 snapshot.
diff --git a/include/linux/pci-dma-compat.h b/include/linux/pci-dma-compat.h
new file mode 100644
index 0000000..c3f1b44
--- /dev/null
+++ b/include/linux/pci-dma-compat.h
@@ -0,0 +1,147 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* include this file if the platform implements the dma_ DMA Mapping API
+ * and wants to provide the pci_ DMA Mapping API in terms of it */
+
+#ifndef _ASM_GENERIC_PCI_DMA_COMPAT_H
+#define _ASM_GENERIC_PCI_DMA_COMPAT_H
+
+#include <linux/dma-mapping.h>
+
+/* This defines the direction arg to the DMA mapping routines. */
+#define PCI_DMA_BIDIRECTIONAL DMA_BIDIRECTIONAL
+#define PCI_DMA_TODEVICE DMA_TO_DEVICE
+#define PCI_DMA_FROMDEVICE DMA_FROM_DEVICE
+#define PCI_DMA_NONE DMA_NONE
+
+static inline void *
+pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
+ dma_addr_t *dma_handle)
+{
+ return dma_alloc_coherent(&hwdev->dev, size, dma_handle, GFP_ATOMIC);
+}
+
+static inline void *
+pci_zalloc_consistent(struct pci_dev *hwdev, size_t size,
+ dma_addr_t *dma_handle)
+{
+ return dma_zalloc_coherent(&hwdev->dev, size, dma_handle, GFP_ATOMIC);
+}
+
+static inline void
+pci_free_consistent(struct pci_dev *hwdev, size_t size,
+ void *vaddr, dma_addr_t dma_handle)
+{
+ dma_free_coherent(&hwdev->dev, size, vaddr, dma_handle);
+}
+
+static inline dma_addr_t
+pci_map_single(struct pci_dev *hwdev, void *ptr, size_t size, int direction)
+{
+ return dma_map_single(&hwdev->dev, ptr, size, (enum dma_data_direction)direction);
+}
+
+static inline void
+pci_unmap_single(struct pci_dev *hwdev, dma_addr_t dma_addr,
+ size_t size, int direction)
+{
+ dma_unmap_single(&hwdev->dev, dma_addr, size, (enum dma_data_direction)direction);
+}
+
+static inline dma_addr_t
+pci_map_page(struct pci_dev *hwdev, struct page *page,
+ unsigned long offset, size_t size, int direction)
+{
+ return dma_map_page(&hwdev->dev, page, offset, size, (enum dma_data_direction)direction);
+}
+
+static inline void
+pci_unmap_page(struct pci_dev *hwdev, dma_addr_t dma_address,
+ size_t size, int direction)
+{
+ dma_unmap_page(&hwdev->dev, dma_address, size, (enum dma_data_direction)direction);
+}
+
+static inline int
+pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg,
+ int nents, int direction)
+{
+ return dma_map_sg(&hwdev->dev, sg, nents, (enum dma_data_direction)direction);
+}
+
+static inline void
+pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg,
+ int nents, int direction)
+{
+ dma_unmap_sg(&hwdev->dev, sg, nents, (enum dma_data_direction)direction);
+}
+
+static inline void
+pci_dma_sync_single_for_cpu(struct pci_dev *hwdev, dma_addr_t dma_handle,
+ size_t size, int direction)
+{
+ dma_sync_single_for_cpu(&hwdev->dev, dma_handle, size, (enum dma_data_direction)direction);
+}
+
+static inline void
+pci_dma_sync_single_for_device(struct pci_dev *hwdev, dma_addr_t dma_handle,
+ size_t size, int direction)
+{
+ dma_sync_single_for_device(&hwdev->dev, dma_handle, size, (enum dma_data_direction)direction);
+}
+
+static inline void
+pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sg,
+ int nelems, int direction)
+{
+ dma_sync_sg_for_cpu(&hwdev->dev, sg, nelems, (enum dma_data_direction)direction);
+}
+
+static inline void
+pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sg,
+ int nelems, int direction)
+{
+ dma_sync_sg_for_device(&hwdev->dev, sg, nelems, (enum dma_data_direction)direction);
+}
+
+static inline int
+pci_dma_mapping_error(struct pci_dev *pdev, dma_addr_t dma_addr)
+{
+ return dma_mapping_error(&pdev->dev, dma_addr);
+}
+
+#ifdef CONFIG_PCI
+static inline int pci_set_dma_mask(struct pci_dev *dev, u64 mask)
+{
+ return dma_set_mask(&dev->dev, mask);
+}
+
+static inline int pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
+{
+ return dma_set_coherent_mask(&dev->dev, mask);
+}
+
+static inline int pci_set_dma_max_seg_size(struct pci_dev *dev,
+ unsigned int size)
+{
+ return dma_set_max_seg_size(&dev->dev, size);
+}
+
+static inline int pci_set_dma_seg_boundary(struct pci_dev *dev,
+ unsigned long mask)
+{
+ return dma_set_seg_boundary(&dev->dev, mask);
+}
+#else
+static inline int pci_set_dma_mask(struct pci_dev *dev, u64 mask)
+{ return -EIO; }
+static inline int pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
+{ return -EIO; }
+static inline int pci_set_dma_max_seg_size(struct pci_dev *dev,
+ unsigned int size)
+{ return -EIO; }
+static inline int pci_set_dma_seg_boundary(struct pci_dev *dev,
+ unsigned long mask)
+{ return -EIO; }
+#endif
+
+#endif