On Fri, Dec 05, 2014 at 02:07:59PM +0000, David Vrabel wrote: > On systems where DMA addresses and physical addresses are not 1:1 > (such as Xen PV guests), the generic dma_get_required_mask() will not > return the correct mask (since it uses max_pfn). > > Some device drivers (such as mptsas, mpt2sas) use > dma_get_required_mask() to set the device's DMA mask to allow them to use > only 32-bit DMA addresses in hardware structures. This results in > unnecessary use of the SWIOTLB if DMA addresses are more than 32-bits, > impacting performance significantly. > > This series allows Xen PV guests to override the default > dma_get_required_mask() with a more suitable one. > > Changes in v5: > - xen_swiotlb_get_required_mask() is x86 only. > > Changes in v4: > - Assume 64-bit mask is required. > > Changes in v3: > - fix off-by-one in xen_dma_get_required_mask() > - split ia64 changes into separate patch. > > Changes in v2: > - split x86 and xen changes into separate patches > > David
Why are you sending these to me? Am I the DMA maintainer and forgot about it? /me digs in MAINTAINERS... Nope, not me! Patches are now deleted from my queue, go use scripts/get_maintainer.pl like you should have done... greg k-h _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
