include/linux/dma-iommu.h

   1 /*
   2  * Copyright (C) 2014-2015 ARM Ltd.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16 #ifndef __DMA_IOMMU_H
  17 #define __DMA_IOMMU_H
  18
  19 #ifdef __KERNEL__
  20 #include <linux/types.h>
  21 #include <asm/errno.h>
  22
  23 #ifdef CONFIG_IOMMU_DMA
  24 #include <linux/dma-mapping.h>
  25 #include <linux/iommu.h>
  26 #include <linux/msi.h>
  27
  28 int iommu_dma_init(void);
  29
  30 /* Domain management interface for IOMMU drivers */
  31 int iommu_get_dma_cookie(struct iommu_domain *domain);
  32 int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base);
  33 void iommu_put_dma_cookie(struct iommu_domain *domain);
  34
  35 /* Setup call for arch DMA mapping code */
  36 int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
  37                 u64 size, struct device *dev);
  38
  39 /* General helpers for DMA-API <-> IOMMU-API interaction */
  40 int dma_info_to_prot(enum dma_data_direction dir, bool coherent,
  41                      unsigned long attrs);
  42
  43 /*
  44  * These implement the bulk of the relevant DMA mapping callbacks, but require
  45  * the arch code to take care of attributes and cache maintenance
  46  */
  47 struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp,
  48                 unsigned long attrs, int prot, dma_addr_t *handle,
  49                 void (*flush_page)(struct device *, const void *, phys_addr_t));
  50 void iommu_dma_free(struct device *dev, struct page **pages, size_t size,
  51                 dma_addr_t *handle);
  52
  53 int iommu_dma_mmap(struct page **pages, size_t size, struct vm_area_struct *vma);
  54
  55 dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
  56                 unsigned long offset, size_t size, int prot);
  57 int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
  58                 int nents, int prot);
  59
  60 /*
  61  * Arch code with no special attribute handling may use these
  62  * directly as DMA mapping callbacks for simplicity
  63  */
  64 void iommu_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size,
  65                 enum dma_data_direction dir, unsigned long attrs);
  66 void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
  67                 enum dma_data_direction dir, unsigned long attrs);
  68 dma_addr_t iommu_dma_map_resource(struct device *dev, phys_addr_t phys,
  69                 size_t size, enum dma_data_direction dir, unsigned long attrs);
  70 void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle,
  71                 size_t size, enum dma_data_direction dir, unsigned long attrs);
  72 int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
  73
  74 /* The DMA API isn't _quite_ the whole story, though... */
  75 void iommu_dma_map_msi_msg(int irq, struct msi_msg *msg);
  76 void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list);
  77
  78 #else
  79
  80 struct iommu_domain;
  81 struct msi_msg;
  82 struct device;
  83
  84 static inline int iommu_dma_init(void)
  85 {
  86         return 0;
  87 }
  88
  89 static inline int iommu_get_dma_cookie(struct iommu_domain *domain)
  90 {
  91         return -ENODEV;
  92 }
  93
  94 static inline int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base)
  95 {
  96         return -ENODEV;
  97 }
  98
  99 static inline void iommu_put_dma_cookie(struct iommu_domain *domain)
 100 {
 101 }
 102
 103 static inline void iommu_dma_map_msi_msg(int irq, struct msi_msg *msg)
 104 {
 105 }
 106
 107 static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list)
 108 {
 109 }
 110
 111 #endif  /* CONFIG_IOMMU_DMA */
 112 #endif  /* __KERNEL__ */
 113 #endif  /* __DMA_IOMMU_H */