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authorJoerg Roedel <joerg.roedel@amd.com>2011-04-18 15:45:45 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2011-05-02 09:19:34 -0700
commit111f02f8a5dcd4ca9ba0d9934fa1d423f735b66b (patch)
treea0faaac06f5bf409e957c71d5a724d2014a759a6 /arch
parent045707f94023998aa702536bb2fb441d8a049475 (diff)
downloadlinux-2.6.38-lt-ux500-111f02f8a5dcd4ca9ba0d9934fa1d423f735b66b.tar.gz
x86, gart: Set DISTLBWALKPRB bit always
commit c34151a742d84ae65db2088ea30495063f697fbe upstream. The DISTLBWALKPRB bit must be set for the GART because the gatt table is mapped UC. But the current code does not set the bit at boot when the BIOS setup the aperture correctly. Fix that by setting this bit when enabling the GART instead of the other places. Cc: Borislav Petkov <borislav.petkov@amd.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Link: http://lkml.kernel.org/r/1303134346-5805-4-git-send-email-joerg.roedel@amd.com Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/include/asm/gart.h4
-rw-r--r--arch/x86/kernel/aperture_64.c2
2 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/include/asm/gart.h b/arch/x86/include/asm/gart.h
index 43085bfc99c..3e7349f91af 100644
--- a/arch/x86/include/asm/gart.h
+++ b/arch/x86/include/asm/gart.h
@@ -66,7 +66,7 @@ static inline void gart_set_size_and_enable(struct pci_dev *dev, u32 order)
* Don't enable translation but enable GART IO and CPU accesses.
* Also, set DISTLBWALKPRB since GART tables memory is UC.
*/
- ctl = DISTLBWALKPRB | order << 1;
+ ctl = order << 1;
pci_write_config_dword(dev, AMD64_GARTAPERTURECTL, ctl);
}
@@ -83,7 +83,7 @@ static inline void enable_gart_translation(struct pci_dev *dev, u64 addr)
/* Enable GART translation for this hammer. */
pci_read_config_dword(dev, AMD64_GARTAPERTURECTL, &ctl);
- ctl |= GARTEN;
+ ctl |= GARTEN | DISTLBWALKPRB;
ctl &= ~(DISGARTCPU | DISGARTIO);
pci_write_config_dword(dev, AMD64_GARTAPERTURECTL, ctl);
}
diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c
index 5955a7800a9..f6a1c2395b5 100644
--- a/arch/x86/kernel/aperture_64.c
+++ b/arch/x86/kernel/aperture_64.c
@@ -500,7 +500,7 @@ out:
* Don't enable translation yet but enable GART IO and CPU
* accesses and set DISTLBWALKPRB since GART table memory is UC.
*/
- u32 ctl = DISTLBWALKPRB | aper_order << 1;
+ u32 ctl = aper_order << 1;
bus = amd_nb_bus_dev_ranges[i].bus;
dev_base = amd_nb_bus_dev_ranges[i].dev_base;