Messages in this thread | | | Date | Fri, 22 Sep 2006 11:32:28 -0700 (PDT) | From | Christoph Lameter <> | Subject | Re: ZONE_DMA |
| |
On Fri, 22 Sep 2006, Jesse Barnes wrote:
> Oh, it's already there in the tree, but obviously some drivers still need > to be converted. See Documentation/DMA-API.txt. It's not PCI specific > like the old PCI DMA interface (Documentation/DMA-mapping.txt) and > provides a way for drivers to specify their addressing limitations > (dma_supported and dma_set_mask), which allows the underlying architecture > code to report a failure if necessary.
AFAICT this is dealing with special dma issues and not with the problem of allocating memory for a certain supported address range from the page allocator. From the first glance at the docs it looks as if it is relying on __GFP_DMAxx to get the allocations right. I think the code could be changed though to call a new page allocator function to get the right memory and that would work for all devices using that API.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |