IPMMU address translation enablement prototype [PATCH/RFC 01/09] iommu/ipmmu-vmsa: Disable IPMMU when address expansion is not needed [PATCH/RFC 02/09] iommu/ipmmu-vmsa: Display system memory informationn during boot [PATCH/RFC 03/09] iommu/ipmmu-vmsa: Introduce keepipmmu boot parameter [PATCH/RFC 04/09] arm64: dts: renesas: ulcb: Introduce keepipmmu boot parameter [PATCH/RFC 05/09] arm64: dts: renesas: salvator: Introduce keepipmmu boot parameter [PATCH/RFC 06/09] arm64: dts: renesas: draak: Introduce keepipmmu boot parameter [PATCH/RFC 07/09] arm64: dts: renesas: ebisu: Introduce keepipmmu boot parameter [PATCH/RFC 08/09] arm64: dts: renesas: eagle: Introduce keepipmmu boot parameter [PATCH/RFC 09/09] arm64: dts: renesas: cat874: Introduce keepipmmu boot parameter These patches experiment with runtime detection of system memory amount and location to check if all memory exists within 32 bits physical address space or not. In case all memory exists within 32 bits then we can assume address expansion via IPMMU will not be required so the white list code will simply ignore enablement of IPMMU devices on systems with smaller amounts of system memory. Not intended for upstream merge however patch 1/9 might be not so far off. Not-Signed-off-by: Magnus Damm <damm+renesas@xxxxxxxxxxxxx> --- Developed on top of next-20190215 arch/arm64/boot/dts/renesas/r8a774c0-cat874.dts | 2 - arch/arm64/boot/dts/renesas/r8a77970-eagle.dts | 2 - arch/arm64/boot/dts/renesas/r8a77990-ebisu.dts | 2 - arch/arm64/boot/dts/renesas/r8a77995-draak.dts | 2 - arch/arm64/boot/dts/renesas/salvator-common.dtsi | 2 - arch/arm64/boot/dts/renesas/ulcb.dtsi | 2 - drivers/iommu/ipmmu-vmsa.c | 29 +++++++++++++++++++++- 7 files changed, 34 insertions(+), 7 deletions(-)
