u32 lis_pci_dma_handle_to_32(lis_dma_addr_t *dma_handle);
Note that these LiS DMA routines all have similar names to routines defined in the kernel. See the file /usr/src/linux/Documentation/DMA-mapping.txt for more information.
LiS does not provide an abstraction for every DMA function offered by the kernel. In particular it restricts itself to the non-scatter-gather mappings, the ones labeled as "single".
-- Dave
At 10:38 AM 10/7/2003 Tuesday, Eugene LiS User wrote:
Hello,
I have a couple of PCI DMA related questions.
1.
I intend to use lis_pci_alloc_consistent() function. I'm naturally interested in the allocated bus address. Looking into sources I see the following comment:
/* * Allocate 'size' bytes and return the CPU pointer to it via return value. * Return the DMA address via 'dma_handle'. <---------------- */ void *lis_pci_alloc_consistent(lis_pci_dev_t *dev, size_t size, lis_dma_addr_t *dma_handle);
Looking into the lis_dma_addr structure I do not see any name that looks like bus address
typedef struct lis_dma_addr { unsigned opaque[8] ; /* opaque kernel structure */ int size ; /* saved size */ void *vaddr ; /* cpu virtual addr */ lis_pci_dev_t *dev ; /* PCI device */ int direction ; /* for map/unmap single */
} lis_dma_addr_t ;
Where can I get allocated bus address from?
Also, do I have to allocate that structure myself? If that is the case, what info should I fill into the lis_dma_addr pointed to by the dma_handle prior calling lis_pci_alloc_consistent()? Size, dev, direction?
2.
I use allocb() to allocate message buffers. How can I make those message buffers DMA-able?
On HPUX I could achieve this using wsio_map() function. Is there an elegant way to do the similar thing on Linux/LiS?
thanks for your help, -- Eugene
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