From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [PATCH v2] r8169: set coherent DMA mask as well as streaming DMA mask Date: Sat, 15 Oct 2016 17:29:49 -0400 (EDT) Message-ID: <20161015.172949.326250924585943753.davem@davemloft.net> References: <1476452433-20518-1-git-send-email-ard.biesheuvel@linaro.org> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: romieu@fr.zoreil.com, nic_swsd@realtek.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org To: ard.biesheuvel@linaro.org Return-path: In-Reply-To: <1476452433-20518-1-git-send-email-ard.biesheuvel@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org From: Ard Biesheuvel Date: Fri, 14 Oct 2016 14:40:33 +0100 > PCI devices that are 64-bit DMA capable should set the coherent > DMA mask as well as the streaming DMA mask. On some architectures, > these are managed separately, and so the coherent DMA mask will be > left at its default value of 32 if it is not set explicitly. This > results in errors such as > > r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded > hwdev DMA mask = 0x00000000ffffffff, dev_addr = 0x00000080fbfff000 > swiotlb: coherent allocation failed for device 0000:02:00.0 size=4096 > CPU: 0 PID: 1062 Comm: systemd-udevd Not tainted 4.8.0+ #35 > Hardware name: AMD Seattle/Seattle, BIOS 10:53:24 Oct 13 2016 > > on systems without memory that is 32-bit addressable by PCI devices. > > Signed-off-by: Ard Biesheuvel Applied.