On Wed, Oct 24 2007, FUJITA Tomonori wrote: > IOMMUs merges scatter/gather segments without considering a low level > driver's restrictions. The problem is that IOMMUs can't access to the > limitations because they are in request_queue. > > This patchset introduces a new structure, device_dma_parameters, > including dma information. A pointer to device_dma_parameters is added > to struct device. The bus specific structures (like pci_dev) includes > device_dma_parameters. Low level drivers can use dma_set_max_seg_size > to tell IOMMUs about the restrictions. > > We can move more dma stuff in struct device (like dma_mask) to struct > device_dma_parameters later (needs some cleanups before that). > > This includes patches for all the IOMMUs that could merge sg (x86_64, > ppc, IA64, alpha, sparc64, and parisc) though only the ppc patch was > tested. The patches for other IOMMUs are only compile tested. > > Thanks to everyone for the comments on the previous submission > to linux-scsi. > > This is against 2.6.24-rc1. The same patchset is also available: Looks good to me, I think we should get this included sooner rather than later. -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
