On Thu, 2014-02-20 at 16:21 +0000, Julien Grall wrote: > Only Xen is able to know if a device can safely avoid to use xen-swiotlb. > This patch introduce a new property "protected-devices" for the hypervisor > node which list device which the IOMMU are been correctly programmed by Xen. > > During Linux boot, Xen specific code will create an hash table which > contains all these devices. The hash table will be used in need_xen_dma_ops > to check if the Xen DMA ops needs to be used for the current device. Is it out of the question to find a field within struct device itself to store this e.g. in struct device_dma_parameters perhaps and avoid the need for a hashtable lookup. device->iommu_group might be another option, if we can create our own group? Ian. -- 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
