From mboxrd@z Thu Jan 1 00:00:00 1970 From: catalin.marinas@arm.com (Catalin Marinas) Date: Wed, 18 May 2016 14:26:21 +0000 Subject: [PATCH v2] arm64: Allow for different DMA and CPU bus offsets In-Reply-To: <573C72DD.6010400@suse.de> References: <1463576010-115428-1-git-send-email-agraf@suse.de> <20160518132741.GE22378@e104818-lin.cambridge.arm.com> <573C72DD.6010400@suse.de> Message-ID: <20160518142620.GA22354@localhost.localdomain> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Wed, May 18, 2016 at 03:49:17PM +0200, Alexander Graf wrote: > On 05/18/2016 03:27 PM, Catalin Marinas wrote: > >On Wed, May 18, 2016 at 02:53:30PM +0200, Alexander Graf wrote: > >>On arm64, all SoCs we supported so far either have an IOMMU or have bus > >>addresses equal to CPU addresses. > >> > >>However, with the Raspberry Pi 3 coming up, this is no longer true. To > >>allow DMA to work with an AArch64 kernel on those devices, let's allow > >>devices to have DMA offsets again. > >> > >>Signed-off-by: Alexander Graf > >We were aware about this issue but we've been waiting for an actual use > >case. I'll queue this for 4.8 (given that RPi3 is not supported by the > >arm64 kernel, I don't see the rush to merge it earlier). > > Sure, works for me. That way Eric can try to push the other few bits > necessary to run an arm64 kernel on the RPi3 towards 4.8 as well :). As long as the firmware is PSCI capable ;) -- Catalin