[PATCH][x86-64] make the pci aperture cachable

[Thomas Schlichter]

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Am Montag, 24. M=E4rz 2003 18:32 schrieb Andi Kleen:
> On Mon, 2003-03-24 at 17:41, [e-mail] wrote:
> > diff -urpN --exclude-from=3D/home/davej/.exclude=20
bk-linus/arch/x86_64/kernel/pci-gart.c=20
linux-2.5/arch/x86_64/kernel/pci-gart.c
> > --- bk-linus/arch/x86_64/kernel/pci-gart.c	2003-03-08 09:56:51.00000000=
0=20
+0000
> > +++ linux-2.5/arch/x86_64/kernel/pci-gart.c	2003-03-18 21:19:53.0000000=
00=20
+0000
> > @@ -419,6 +419,7 @@ static __init int init_k8_gatt(agp_kern_
> >  		panic("Cannot allocate GATT table");=20
> >  	memset(gatt, 0, gatt_size);=20
> >  	change_page_attr(virt_to_page(gatt), gatt_size/PAGE_SIZE,=20
PAGE_KERNEL_NOCACHE);
> > +	global_flush_tlb();
> >  	agp_gatt_table =3D gatt;
> >  =09
> >  	for_all_nb(dev) {=20
>=20
> No it needs to be completely removed. the pci aperture is supposed to be
> cachable (unlike the AGP aperture) That's still a trace of an earlier
> design.
>=20
> -Andi

As this patch has been applied anyway here is a patch to make the pci apert=
ure=20
cachable for 2.5.66.

  Thomas Schlichter
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=2D-- linux-2.5.66/arch/x86_64/kernel/pci-gart.c.old	Tue Mar 25 01:09:51 20=
03
+++ linux-2.5.66/arch/x86_64/kernel/pci-gart.c	Tue Mar 25 01:16:28 2003
@@ -418,8 +418,6 @@
 	if (!gatt)=20
 		panic("Cannot allocate GATT table");=20
 	memset(gatt, 0, gatt_size);=20
=2D	change_page_attr(virt_to_page(gatt), gatt_size/PAGE_SIZE, PAGE_KERNEL_N=
OCACHE);
=2D	global_flush_tlb();
 	agp_gatt_table =3D gatt;
 =09
 	for_all_nb(dev) {=20
@@ -438,8 +436,6 @@
 	}
 	flush_gart();=20
 =09
=2D	global_flush_tlb();
=2D	=09
 	printk("PCI-DMA: aperture base @ %x size %u KB\n", aper_base, aper_size>>=
10);=20
 	return 0;
=20

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