Ard Biesheuvel <ard.biesheu...@linaro.org> : > 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 <ard.biesheu...@linaro.org>
Acked-by: Francois Romieu <rom...@fr.zoreil.com> Unless someone plans to plug an acenic, a 83820 (pci-e gem board, anyone ?) on top of a pci <-> pci-e adapter on this kind of motherboard, no other network driver that uses the pci_... dma api exhibits this mixed 32 / 64 bit support bug. I haven't checked devices with 32 < mask < 64 nor plain DMA api converted ones. -- Ueimor
