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authorJoerg Roedel <joerg.roedel@amd.com>2011-04-18 15:45:45 +0200
committerH. Peter Anvin <hpa@zytor.com>2011-04-18 09:26:48 -0700
commitc34151a742d84ae65db2088ea30495063f697fbe (patch)
tree1322126cd11a9ad7529fca7d76b90a1a8acd6d5d /arch
parentaf289bfe15fc92ecfbf6d8312713815b33e452c0 (diff)
downloadop-kernel-dev-c34151a742d84ae65db2088ea30495063f697fbe.zip
op-kernel-dev-c34151a742d84ae65db2088ea30495063f697fbe.tar.gz
x86, gart: Set DISTLBWALKPRB bit always
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: <stable@kernel.org> 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>
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 88c1ebe..156cd5d 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 86d1ad4..73fb469 100644
--- a/arch/x86/kernel/aperture_64.c
+++ b/arch/x86/kernel/aperture_64.c
@@ -499,7 +499,7 @@ 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;
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