From mboxrd@z Thu Jan 1 00:00:00 1970 From: catalin.marinas@arm.com (Catalin Marinas) Date: Wed, 1 Jun 2016 09:42:28 +0100 Subject: [PATCH v2] arm64: Allow for different DMA and CPU bus offsets In-Reply-To: <20160518132741.GE22378@e104818-lin.cambridge.arm.com> References: <1463576010-115428-1-git-send-email-agraf@suse.de> <20160518132741.GE22378@e104818-lin.cambridge.arm.com> Message-ID: <20160601084228.GB23375@e104818-lin.cambridge.arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Wed, May 18, 2016 at 02:27:41PM +0100, 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). In case this patch goes in via the arm-soc tree (together with other RPi3 patches): Acked-by: Catalin Marinas