On 13/10/2007, Steinke, Dave <[EMAIL PROTECTED]> wrote: > > I need to program the source / destination address registers in the > bridge's DMA controller so the DMAC can access my kernel buffer. > > I do the following: > - ddi_dma_alloc_handle() > - ddi_dma_mem_alloc() to allocate my kernel buffer > - ddi_dma_addr_bind_handle() to bind my buffer to my dma handle and get > a dma_cookie > > I understand the ddi_dma_cookie_t contains an address, accessible via > the macros dmac_laddress() (for 64 bit DMACs) and dmac_address() (for 32 > bit DMACs) > According to the man pages for ddi_dma_cookie_t(9S): > "dmac_laddress specifies a 64-bit I/O address appropriate for > programming the device's DMA engine" > > My Question is: > If my DMAC is on the PCIx bus, do I need to perform any sort of mapping > upon the cookie's address to make my kernel memory accessible to this > PCI device? >
No. That's the point of the ddi_dma_addr_bind_handle() call. It uses information provided by the nexus driver hierarchy (PCIx and any other bridges in the way) to provide a translated address for your DMAC. Paul -- Paul Durrant http://www.linkedin.com/in/pdurrant _______________________________________________ driver-discuss mailing list driver-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/driver-discuss
