arch/ia64/kernel/dma-mapping.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/dma-mapping.h>
   3 #include <linux/swiotlb.h>
   4 #include <linux/export.h>
   5
   6 /* Set this to 1 if there is a HW IOMMU in the system */
   7 int iommu_detected __read_mostly;
   8
   9 const struct dma_map_ops *dma_ops;
  10 EXPORT_SYMBOL(dma_ops);
  11
  12 #define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
  13
  14 static int __init dma_init(void)
  15 {
  16         dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
  17
  18         return 0;
  19 }
  20 fs_initcall(dma_init);
  21
  22 const struct dma_map_ops *dma_get_ops(struct device *dev)
  23 {
  24         return dma_ops;
  25 }
  26 EXPORT_SYMBOL(dma_get_ops);
  27
  28 #ifdef CONFIG_SWIOTLB
  29 void __init swiotlb_dma_init(void)
  30 {
  31         dma_ops = &swiotlb_dma_ops;
  32         swiotlb_init(1);
  33 }
  34 #endif