On Wed, 28 Nov 2012 19:07:46 +0100 Stephen Warren <swarren@xxxxxxxxxxxxx> wrote: ...... > >>> Please read more about bus notifiers. IMHO a good example is provided in > >>> the following thread: > >>> http://www.mail-archive.com/linux-samsung-soc@xxxxxxxxxxxxxxx/msg12238.html > >> > >> This bus notifier seems enough flexible to afford the variation of > >> IOMMU map info, like Tegra ASID, which could be platform-specific, and > >> the other could be common too. There's already iommu_bus_notifier > >> too. I'll try to implement something base on this. > > > > Experimentally implemented as below. With the followig patch, each > > device could specify its own map in DT, and automatically the device > > would be attached to the map. > > > > There is a case that some devices share a map. This patch doesn't > > suppor such case yet. > > > > From 8cb75bb6f3a8535a077e0e85265f87c1f1289bfd Mon Sep 17 00:00:00 2001 > > From: Hiroshi Doyu <hdoyu@xxxxxxxxxx> > > Date: Wed, 28 Nov 2012 14:47:04 +0200 > > Subject: [PATCH 1/1] ARM: tegra: bus_notifier registers IOMMU devices > > > > platform_bus notifier registers IOMMU devices if dma-window is > > specified. > > > > Its format is: > > dma-window = <"start" "size">; > > ex) > > dma-window = <0x12345000 0x8000>; > > > > Signed-off-by: Hiroshi Doyu <hdoyu@xxxxxxxxxx> > > --- > > arch/arm/mach-tegra/board-dt-tegra30.c | 40 ++++++++++++++++++++++++++++++++ > > Shouldn't this patch be to the IOMMU driver itself, not the core Tegra code? That could be possible and cleaner. I'll check if it works. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>