On Fri, Mar 14, 2014 at 04:50:23PM +0000, Julien Grall wrote: > On 02/24/2014 08:49 PM, Stefano Stabellini wrote: > > On Mon, 24 Feb 2014, gregkh@xxxxxxxxxxxxxxxxxxx wrote: > > Julien is proposing to store the list of "safe" devices on an hash table > > in the Xen specific code (in arch/arm/xen/enlighten.c, see > > http://marc.info/?l=linux-kernel&m=139291370526082&w=2). > > Whenever Linux is about to do DMA, we would check in the hashtable to > > figure out whether we need to go through the swiotlb or we can simply > > use the native dma_ops. > > > > Ian and I were thinking that it would be much easier and faster to have > > a "xen_safe_device" parameter in struct device and just check for that. > > It doesn't actually need to be in struct device, it could simply be a > > flag in struct device_dma_parameters as Ian was suggesting. > > > > Julien, could you please come up with a simple patch to demonstrate the > > concept? > > Hello Stefano and Greg, > > Sorry for the late answer. I wrote a simple patch which depend on patch #1. > Let me know if it's the right direction. I have no context here, care to start the patch series over? thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
