On Thu, Mar 28, 2013 at 1:14 AM, Dhananjay Maske < dhananjay.mask...@gmail.com> wrote:
> Hi All, > I am fairly New to Linux kernel Programming and i have few questions > with respect to pci_alloc_consistent . > > 1) as we know pci_alloc_consistent allocates dma buffers which is visible > to DMA controller as well as CPU. > virt_add = pci_alloc_consistent(pdev, size, dma_addr_t bus_adrr); > > here it will allocate a buffer and return its virtual address and > corresponding bus address. > > My question is do these two address ultimately point to similar location > but from different perspectives ?. > > 2) After allocating these address, how do we proceed given that i have a > ASIC register which has the dma_rx_desc_start address ? > > 3) Also does all the HW's which support dma have the descriptor data > structures by provided by Vender or is there any specific format that dev > has to be aware of for designing such descriptor for that particular driver > ? >
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