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On Wed, Mar 15, 2006 at 12:26:12AM +0100, Pavel Machek wrote: > On ?t 14-03-06 17:22:48, Jon Mason wrote: > > On Wed, Mar 15, 2006 at 12:03:48AM +0100, Pavel Machek wrote: > > > On ?t 14-03-06 10:26:34, Muli Ben-Yehuda wrote: > > > > This patch hooks Calgary into the build and the x86-64 IOMMU > > > > initialization paths. > > > > > > > > Signed-Off-By: Muli Ben-Yehuda <mulix@mulix.org> > > > > Signed-Off-By: Jon Mason <jdmason@us.ibm.com> > > > > > > > > diff -Naurp --exclude-from /home/muli/w/dontdiff iommu_detected/arch/x86_64/Kconfig linux/arch/x86_64/Kconfig > > > > --- iommu_detected/arch/x86_64/Kconfig 2006-03-14 08:58:23.000000000 +0200 > > > > +++ linux/arch/x86_64/Kconfig 2006-03-12 10:49:04.000000000 +0200 > > > > @@ -372,6 +372,16 @@ config GART_IOMMU > > > > and a software emulation used on other systems. > > > > If unsure, say Y. > > > > > > > > +config CALGARY_IOMMU > > > > + bool "IBM x366 server IOMMU" > > > > + default y > > > > + depends on PCI && MPSC && EXPERIMENTAL > > > > + help > > > > + Support for hardware IOMMUs in IBM's x366 server > > > > + systems. The IOMMU can be turned off at runtime with the > > > > + iommu=off parameter. Normally the kernel will make the right > > > > > > Runtime? I think you meant boottime. > > > > Yes, thanks for pointing it out. > > > > > > > > > + choice by itself. If unsure, say Y. > > > > > > Eh? How common are those machines? > > > > While this code is specific to IBM's xSeries systems, it will not hurt > > to have it enabled on other systems. The code is intelligent enough to > > detect the existence of Calgary chips and, if not there, will go down > > the standard path of no-iommu (providing that swiotlb has not been > > specified at boottime). If this isn't clear enough in the description, > > I can remedy that. > > No, it was pretty clear. But unless these machines are pretty common, > I'd suggest users to say N. ... its like most drivers, it takes space > but no other harm. Still we don't want to say "say Y" on all drivers. Ah, I understand your point now. I'll fixup the comment and default value. > ...it is not required for boot on IBM x366 machines, is it? No, it is not. Thanks, Jon > Pavel > > -- > 56: MD5.TransformBlock( adNAME, 0, strName.IndexOf( '\0' ), adNAME, 0 ); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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