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| author |   Joerg Roedel <joerg.roedel@amd.com> | 2008-09-18 15:23:43 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2008-09-19 12:59:06 +0200 |
| commit | 2842e5bf3115193f05dc9dac20f940e7abf44c1a (patch) | |
| tree | 31461a4fb45db1868f4bfb9f99251db7a5ce6d33 /arch/x86/kernel/pci-dma.c | |
| parent | AMD IOMMU: move TLB flushing to the map/unmap helper functions (diff) | |
| download | linux-dev-2842e5bf3115193f05dc9dac20f940e7abf44c1a.tar.xz linux-dev-2842e5bf3115193f05dc9dac20f940e7abf44c1a.zip | |
x86: move GART TLB flushing options to generic code
The GART currently implements the iommu=[no]fullflush command line
parameters which influence its IO/TLB flushing strategy. This patch
makes these parameters generic so that they can be used by the AMD IOMMU
too.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/pci-dma.c')
| -rw-r--r-- | arch/x86/kernel/pci-dma.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c index 0a1408abcc62..d2f2c0158dc1 100644 --- a/arch/x86/kernel/pci-dma.c +++ b/arch/x86/kernel/pci-dma.c @@ -16,6 +16,15 @@ EXPORT_SYMBOL(dma_ops); static int iommu_sac_force __read_mostly; +/* + * If this is disabled the IOMMU will use an optimized flushing strategy + * of only flushing when an mapping is reused. With it true the GART is + * flushed for every mapping. Problem is that doing the lazy flush seems + * to trigger bugs with some popular PCI cards, in particular 3ware (but + * has been also also seen with Qlogic at least). + */ +int iommu_fullflush; + #ifdef CONFIG_IOMMU_DEBUG int panic_on_overflow __read_mostly = 1; int force_iommu __read_mostly = 1; @@ -171,6 +180,10 @@ static __init int iommu_setup(char *p) } if (!strncmp(p, "nomerge", 7)) iommu_merge = 0; + if (!strncmp(p, "fullflush", 8)) + iommu_fullflush = 1; + if (!strncmp(p, "nofullflush", 11)) + iommu_fullflush = 0; if (!strncmp(p, "forcesac", 8)) iommu_sac_force = 1; if (!strncmp(p, "allowdac", 8)) |