root/drivers/misc/mic/scif/scif_map.h

INCLUDED FROM

DEFINITIONS

1. scif_alloc_coherent
2. scif_free_coherent
3. scif_map_single
4. scif_unmap_single
5. scif_ioremap
6. scif_iounmap
7. scif_map_page

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Intel MIC Platform Software Stack (MPSS)
   4  *
   5  * Copyright(c) 2014 Intel Corporation.
   6  *
   7  * Intel SCIF driver.
   8  */
   9 #ifndef SCIF_MAP_H
  10 #define SCIF_MAP_H
  11 
  12 #include "../bus/scif_bus.h"
  13 
  14 static __always_inline void *
  15 scif_alloc_coherent(dma_addr_t *dma_handle,
  16                     struct scif_dev *scifdev, size_t size,
  17                     gfp_t gfp)
  18 {
  19         void *va;
  20 
  21         if (scifdev_self(scifdev)) {
  22                 va = kmalloc(size, gfp);
  23                 if (va)
  24                         *dma_handle = virt_to_phys(va);
  25         } else {
  26                 va = dma_alloc_coherent(&scifdev->sdev->dev,
  27                                         size, dma_handle, gfp);
  28                 if (va && scifdev_is_p2p(scifdev))
  29                         *dma_handle = *dma_handle + scifdev->base_addr;
  30         }
  31         return va;
  32 }
  33 
  34 static __always_inline void
  35 scif_free_coherent(void *va, dma_addr_t local,
  36                    struct scif_dev *scifdev, size_t size)
  37 {
  38         if (scifdev_self(scifdev)) {
  39                 kfree(va);
  40         } else {
  41                 if (scifdev_is_p2p(scifdev) && local > scifdev->base_addr)
  42                         local = local - scifdev->base_addr;
  43                 dma_free_coherent(&scifdev->sdev->dev,
  44                                   size, va, local);
  45         }
  46 }
  47 
  48 static __always_inline int
  49 scif_map_single(dma_addr_t *dma_handle,
  50                 void *local, struct scif_dev *scifdev, size_t size)
  51 {
  52         int err = 0;
  53 
  54         if (scifdev_self(scifdev)) {
  55                 *dma_handle = virt_to_phys((local));
  56         } else {
  57                 *dma_handle = dma_map_single(&scifdev->sdev->dev,
  58                                              local, size, DMA_BIDIRECTIONAL);
  59                 if (dma_mapping_error(&scifdev->sdev->dev, *dma_handle))
  60                         err = -ENOMEM;
  61                 else if (scifdev_is_p2p(scifdev))
  62                         *dma_handle = *dma_handle + scifdev->base_addr;
  63         }
  64         if (err)
  65                 *dma_handle = 0;
  66         return err;
  67 }
  68 
  69 static __always_inline void
  70 scif_unmap_single(dma_addr_t local, struct scif_dev *scifdev,
  71                   size_t size)
  72 {
  73         if (!scifdev_self(scifdev)) {
  74                 if (scifdev_is_p2p(scifdev))
  75                         local = local - scifdev->base_addr;
  76                 dma_unmap_single(&scifdev->sdev->dev, local,
  77                                  size, DMA_BIDIRECTIONAL);
  78         }
  79 }
  80 
  81 static __always_inline void *
  82 scif_ioremap(dma_addr_t phys, size_t size, struct scif_dev *scifdev)
  83 {
  84         void *out_virt;
  85         struct scif_hw_dev *sdev = scifdev->sdev;
  86 
  87         if (scifdev_self(scifdev))
  88                 out_virt = phys_to_virt(phys);
  89         else
  90                 out_virt = (void __force *)
  91                            sdev->hw_ops->remap(sdev, phys, size);
  92         return out_virt;
  93 }
  94 
  95 static __always_inline void
  96 scif_iounmap(void *virt, size_t len, struct scif_dev *scifdev)
  97 {
  98         if (!scifdev_self(scifdev)) {
  99                 struct scif_hw_dev *sdev = scifdev->sdev;
 100 
 101                 sdev->hw_ops->unmap(sdev, (void __force __iomem *)virt);
 102         }
 103 }
 104 
 105 static __always_inline int
 106 scif_map_page(dma_addr_t *dma_handle, struct page *page,
 107               struct scif_dev *scifdev)
 108 {
 109         int err = 0;
 110 
 111         if (scifdev_self(scifdev)) {
 112                 *dma_handle = page_to_phys(page);
 113         } else {
 114                 struct scif_hw_dev *sdev = scifdev->sdev;
 115                 *dma_handle = dma_map_page(&sdev->dev,
 116                                            page, 0x0, PAGE_SIZE,
 117                                            DMA_BIDIRECTIONAL);
 118                 if (dma_mapping_error(&sdev->dev, *dma_handle))
 119                         err = -ENOMEM;
 120                 else if (scifdev_is_p2p(scifdev))
 121                         *dma_handle = *dma_handle + scifdev->base_addr;
 122         }
 123         if (err)
 124                 *dma_handle = 0;
 125         return err;
 126 }
 127 #endif  /* SCIF_MAP_H */