commit afa9fdc2f5f8e4d98f3e77bfa204412cbc181346
author FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Sat Sep 20 01:23:30 2008 +0900
committer Ingo Molnar <mingo@elte.hu> Mon Sep 22 20:43:37 2008 +0200
tree 8e6c390d8dc18734f6071d2ddd7a2bca01fe9000
parent ed6dc4981368aa8ac89b0ea61535cfa2b03533cb

iommu: remove fullflush and nofullflush in IOMMU generic option

This patch against tip/x86/iommu virtually reverts
2842e5bf3115193f05dc9dac20f940e7abf44c1a. But just reverting the
commit breaks AMD IOMMU so this patch also includes some fixes.

The above commit adds new two options to x86 IOMMU generic kernel boot
options, fullflush and nofullflush. But such change that affects all
the IOMMUs needs more discussion (all IOMMU parties need the chance to
discuss it):

http://lkml.org/lkml/2008/9/19/106

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

Documentation/kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 40066ce..040ce30 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -284,6 +284,11 @@
 			isolate - enable device isolation (each device, as far
 			          as possible, will get its own protection
 			          domain)
+			fullflush - enable flushing of IO/TLB entries when
+				    they are unmapped. Otherwise they are
+				    flushed before they will be reused, which
+				    is a lot of faster
+
 	amd_iommu_size= [HW,X86-64]
 			Define the size of the aperture for the AMD IOMMU
 			driver. Possible values are:
@@ -893,10 +898,6 @@
 		nomerge
 		forcesac
 		soft
-		fullflush
-			Flush IO/TLB at every deallocation
-		nofullflush
-			Flush IO/TLB only when addresses are reused (default)
 
 
 	intel_iommu=	[DMAR] Intel IOMMU driver (DMAR) option

Documentation/x86/x86_64/boot-options.txt

diff --git a/Documentation/x86/x86_64/boot-options.txt b/Documentation/x86/x86_64/boot-options.txt
index c83c8e4..b0c7b6c 100644
--- a/Documentation/x86/x86_64/boot-options.txt
+++ b/Documentation/x86/x86_64/boot-options.txt
@@ -233,6 +233,8 @@
   iommu options only relevant to the AMD GART hardware IOMMU:
     <size>             Set the size of the remapping area in bytes.
     allowed            Overwrite iommu off workarounds for specific chipsets.
+    fullflush          Flush IOMMU on each allocation (default).
+    nofullflush        Don't use IOMMU fullflush.
     leak               Turn on simple iommu leak tracing (only when
                        CONFIG_IOMMU_LEAK is on). Default number of leak pages
                        is 20.