From: Joerg Roedel Date: Thu, 3 Jul 2008 17:35:06 +0000 (+0200) Subject: x86, AMD IOMMU: more verbose Kconfig description text X-Git-Tag: v2.6.27-rc1~1106^2~249^7~6 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=18d22200740b83a5d968d3236c27c310b3e8fda6;p=linux-2.6-omap-h63xx.git x86, AMD IOMMU: more verbose Kconfig description text This patch replaces the short description text for AMD IOMMU in Kconfig with a more verbose one. Signed-off-by: Joerg Roedel Cc: iommu@lists.linux-foundation.org Cc: bhavna.sarathy@amd.com Cc: robert.richter@amd.com Cc: Joerg Roedel Signed-off-by: Ingo Molnar --- diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 8aae462f4e0..b120cffae1e 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -554,7 +554,15 @@ config AMD_IOMMU select SWIOTLB depends on X86_64 && PCI && ACPI help - Select this to get support for AMD IOMMU hardware in your system. + With this option you can enable support for AMD IOMMU hardware in + your system. An IOMMU is a hardware component which provides + remapping of DMA memory accesses from devices. With an AMD IOMMU you + can isolate the the DMA memory of different devices and protect the + system from misbehaving device drivers or hardware. + + You can find out if your system has an AMD IOMMU if you look into + your BIOS for an option to enable it or if you have an IVRS ACPI + table. # need this always selected by IOMMU for the VIA workaround config SWIOTLB