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See http://www.infradead.org/rpr.html X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Oded Gabbay , Greg KH , Christoph Hellwig , "Linux-Kernel@Vger. Kernel. Org" , linuxppc-dev@ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Wed, Jun 12, 2019 at 04:35:22PM +1000, Oliver O'Halloran wrote: > Setting a 48 bit DMA mask doesn't work today because we only allocate > IOMMU tables to cover the 0..2GB range of PCI bus addresses. I don't think that is true upstream, and if it is we need to fix bug in the powerpc code. powerpc should be falling back treating a 48-bit dma mask like a 32-bit one at least, that is use dynamic iommu mappings instead of using the direct mapping. And from my reding of arch/powerpc/kernel/dma-iommu.c that is exactly what it does.