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| author | David Woodhouse <David.Woodhouse@intel.com> | 2009-06-26 19:10:36 +0100 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2009-06-29 12:37:44 +0100 |
| commit | c7ab48d2acaf959e4d59c3f55d12fdb7ca9afd7c (patch) | |
| tree | 5474dadf86c95ddf3b347000f5c114f154e7a0ab /arch/x86 | |
| parent | b213203e475212a69ad6fedfb73464087e317148 (diff) | |
| download | talos-obmc-linux-c7ab48d2acaf959e4d59c3f55d12fdb7ca9afd7c.tar.gz talos-obmc-linux-c7ab48d2acaf959e4d59c3f55d12fdb7ca9afd7c.zip | |
intel-iommu: Clean up identity mapping code, remove CONFIG_DMAR_GFX_WA
There's no need for the GFX workaround now we have 'iommu=pt' for the
cases where people really care about performance. There's no need to
have a special case for just one type of device.
This also speeds up the iommu=pt path and reduces memory usage by
setting up the si_domain _once_ and then using it for all devices,
rather than giving each device its own private page tables.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/Kconfig | 15 |
1 files changed, 2 insertions, 13 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index d1430ef6b4f9..c07f72205909 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1913,25 +1913,14 @@ config DMAR_DEFAULT_ON recommended you say N here while the DMAR code remains experimental. -config DMAR_GFX_WA - def_bool y - prompt "Support for Graphics workaround" - depends on DMAR - ---help--- - Current Graphics drivers tend to use physical address - for DMA and avoid using DMA APIs. Setting this config - option permits the IOMMU driver to set a unity map for - all the OS-visible memory. Hence the driver can continue - to use physical addresses for DMA. - config DMAR_FLOPPY_WA def_bool y depends on DMAR ---help--- - Floppy disk drivers are know to bypass DMA API calls + Floppy disk drivers are known to bypass DMA API calls thereby failing to work when IOMMU is enabled. This workaround will setup a 1:1 mapping for the first - 16M to make floppy (an ISA device) work. + 16MiB to make floppy (an ISA device) work. config INTR_REMAP bool "Support for Interrupt Remapping (EXPERIMENTAL)" |
