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[packages/kernel.git] / 2.6.0-t8-pci_dma_sync_to_device-lkml.patch
1 --- linux-2.6.0-test8/include/asm-i386/dma-mapping.h    Wed Oct  8 21:24:53 2003
2 +++ v2.6.0-test8-md/include/asm-i386/dma-mapping.h      Tue Oct 21 10:56:45 2003
3 @@ -92,6 +92,20 @@
4         flush_write_buffers();
5  }
6  
7 +static inline void
8 +dma_sync_to_device_single(struct device *dev, dma_addr_t dma_handle, size_t size,
9 +               enum dma_data_direction direction)
10 +{
11 +       flush_write_buffers();
12 +}
13 +
14 +static inline void
15 +dma_sync_to_device_sg(struct device *dev, struct scatterlist *sg, int nelems,
16 +                enum dma_data_direction direction)
17 +{
18 +       flush_write_buffers();
19 +}
20 +
21  static inline int
22  dma_supported(struct device *dev, u64 mask)
23  {
24 --- linux-2.6.0-test8/include/asm-generic/pci-dma-compat.h      Wed Oct  8 21:24:02 2003
25 +++ v2.6.0-test8-md/include/asm-generic/pci-dma-compat.h        Tue Oct 21 10:55:09 2003
26 @@ -84,4 +84,18 @@
27         dma_sync_sg(hwdev == NULL ? NULL : &hwdev->dev, sg, nelems, (enum dma_data_direction)direction);
28  }
29  
30 +static inline void
31 +pci_dma_sync_to_device_single(struct pci_dev *hwdev, dma_addr_t dma_handle,
32 +                   size_t size, int direction)
33 +{
34 +       dma_sync_to_device_single(hwdev == NULL ? NULL : &hwdev->dev, dma_handle, size, (enum dma_data_direction)direction);
35 +}
36 +
37 +static inline void
38 +pci_dma_sync_to_device_sg(struct pci_dev *hwdev, struct scatterlist *sg,
39 +               int nelems, int direction)
40 +{
41 +       dma_sync_to_device_sg(hwdev == NULL ? NULL : &hwdev->dev, sg, nelems, (enum dma_data_direction)direction);
42 +}
43 +
44  #endif
45 --- linux-2.6.0-test8/Documentation/DMA-mapping.txt     Wed Oct  8 21:24:06 2003
46 +++ v2.6.0-test8-md/Documentation/DMA-mapping.txt       Tue Oct 21 11:27:17 2003
47 @@ -543,8 +543,11 @@
48  all bus addresses.
49  
50  If you need to use the same streaming DMA region multiple times and touch
51 -the data in between the DMA transfers, just map it with
52 -pci_map_{single,sg}, and after each DMA transfer call either:
53 +the data in between the DMA transfers, the buffer needs to be synced
54 +depending on the transfer direction.
55 +
56 +When reading from the device, just map it with pci_map_{single,sg},
57 +and after each DMA transfer call either:
58  
59         pci_dma_sync_single(dev, dma_handle, size, direction);
60  
61 @@ -553,6 +556,20 @@
62         pci_dma_sync_sg(dev, sglist, nents, direction);
63  
64  as appropriate.
65 +
66 +When writing to the mapped the buffer, prepare the data and
67 +then before giving the buffer to the hardware call either:
68 +
69 +       pci_dma_sync_to_device_single(dev, dma_handle, size, direction);
70 +
71 +or:
72 +
73 +       pci_dma_sync_to_device_sg(dev, sglist, nents, direction);
74 +
75 +as appropriate.
76 +
77 +For bidirectional mappings the corresponding calls are required before and
78 +after passing ownership between cpu and hardware.
79  
80  After the last DMA transfer call one of the DMA unmap routines
81  pci_unmap_{single,sg}. If you don't touch the data from the first pci_map_*
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