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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