include/linux/dma-iommu.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2014-2015 ARM Ltd.
   4  */
   5 #ifndef __DMA_IOMMU_H
   6 #define __DMA_IOMMU_H
   7
   8 #include <linux/errno.h>
   9 #include <linux/types.h>
  10
  11 #ifdef CONFIG_IOMMU_DMA
  12 #include <linux/dma-mapping.h>
  13 #include <linux/iommu.h>
  14 #include <linux/msi.h>
  15
  16 /* Domain management interface for IOMMU drivers */
  17 int iommu_get_dma_cookie(struct iommu_domain *domain);
  18 int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base);
  19 void iommu_put_dma_cookie(struct iommu_domain *domain);
  20
  21 /* Setup call for arch DMA mapping code */
  22 void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 size);
  23
  24 /* The DMA API isn't _quite_ the whole story, though... */
  25 /*
  26  * iommu_dma_prepare_msi() - Map the MSI page in the IOMMU device
  27  *
  28  * The MSI page will be stored in @desc.
  29  *
  30  * Return: 0 on success otherwise an error describing the failure.
  31  */
  32 int iommu_dma_prepare_msi(struct msi_desc *desc, phys_addr_t msi_addr);
  33
  34 /* Update the MSI message if required. */
  35 void iommu_dma_compose_msi_msg(struct msi_desc *desc,
  36                                struct msi_msg *msg);
  37
  38 void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list);
  39
  40 #else /* CONFIG_IOMMU_DMA */
  41
  42 struct iommu_domain;
  43 struct msi_desc;
  44 struct msi_msg;
  45 struct device;
  46
  47 static inline void iommu_setup_dma_ops(struct device *dev, u64 dma_base,
  48                 u64 size)
  49 {
  50 }
  51
  52 static inline int iommu_get_dma_cookie(struct iommu_domain *domain)
  53 {
  54         return -ENODEV;
  55 }
  56
  57 static inline int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base)
  58 {
  59         return -ENODEV;
  60 }
  61
  62 static inline void iommu_put_dma_cookie(struct iommu_domain *domain)
  63 {
  64 }
  65
  66 static inline int iommu_dma_prepare_msi(struct msi_desc *desc,
  67                                         phys_addr_t msi_addr)
  68 {
  69         return 0;
  70 }
  71
  72 static inline void iommu_dma_compose_msi_msg(struct msi_desc *desc,
  73                                              struct msi_msg *msg)
  74 {
  75 }
  76
  77 static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list)
  78 {
  79 }
  80
  81 #endif  /* CONFIG_IOMMU_DMA */
  82 #endif  /* __DMA_IOMMU_H */