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| author | Borislav Petkov <borislav.petkov@amd.com> | 2010-09-03 18:39:40 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-09-05 14:28:34 +0200 |
| commit | 260133ab658bd2b80e07832a878e00405e19ff43 (patch) | |
| tree | c48b062b77416348c268f80df7c294f35f35588f /arch/x86/include/asm/gart.h | |
| parent | x86, GART: Remove superfluous AMD64_GARTEN (diff) | |
| download | linux-260133ab658bd2b80e07832a878e00405e19ff43.tar.xz linux-260133ab658bd2b80e07832a878e00405e19ff43.zip | |
x86, GART: Disable GART table walk probes
Current code tramples over bit F3x90[6] which can be used to
disable GART table walk probes. However, this bit should be set
for performance reasons (speed up GART table walks). We are
allowed to do that since we put GART tables in UC memory later
anyway. Make it so.
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
LKML-Reference: <1283531981-7495-3-git-send-email-bp@amd64.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/include/asm/gart.h')
| -rw-r--r-- | arch/x86/include/asm/gart.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/x86/include/asm/gart.h b/arch/x86/include/asm/gart.h index fba0a72c4cc5..bf357f9b25f0 100644 --- a/arch/x86/include/asm/gart.h +++ b/arch/x86/include/asm/gart.h @@ -17,6 +17,7 @@ extern int fix_aperture; #define GARTEN (1<<0) #define DISGARTCPU (1<<4) #define DISGARTIO (1<<5) +#define DISTLBWALKPRB (1<<6) /* GART cache control register bits. */ #define INVGART (1<<0) @@ -56,6 +57,19 @@ static inline void gart_iommu_hole_init(void) extern int agp_amd64_init(void); +static inline void gart_set_size_and_enable(struct pci_dev *dev, u32 order) +{ + u32 ctl; + + /* + * Don't enable translation but enable GART IO and CPU accesses. + * Also, set DISTLBWALKPRB since GART tables memory is UC. + */ + ctl = DISTLBWALKPRB | order << 1; + + pci_write_config_dword(dev, AMD64_GARTAPERTURECTL, ctl); +} + static inline void enable_gart_translation(struct pci_dev *dev, u64 addr) { u32 tmp, ctl; |