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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2010-03-02 17:25:38 +0300 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-03-19 08:38:16 +0300 |
| commit | 191aee58b6568cf8143901bfa3f57a9b8faa6f1c (patch) | |
| tree | 296e0a4815c59e0289d88cbec8bfe6d02b50bb85 /arch/powerpc/Kconfig | |
| parent | a93272969c6b1d59883fcbb04845420bd72c9a20 (diff) | |
| download | linux-191aee58b6568cf8143901bfa3f57a9b8faa6f1c.tar.xz | |
powerpc: Remove IOMMU_VMERGE config option
The description says:
Cause IO segments sent to a device for DMA to be merged virtually
by the IOMMU when they happen to have been allocated contiguously.
This doesn't add pressure to the IOMMU allocator. However, some
drivers don't support getting large merged segments coming back
from *_map_sg().
Most drivers don't have this problem; it is safe to say Y here.
It's out of date. Long ago, drivers didn't have a way to tell IOMMUs
about their segment length limit (that is, the maximum segment length
that they can handle). So IOMMUs merged as many segments as possible
and gave too large segments to drivers.
dma_get_max_seg_size() was introduced to solve the above
problem. Device drives can use the API to tell IOMMU about the maximum
segment length that they can handle. In addition, the default limit
(64K) should be safe for everyone.
So this config option seems to be unnecessary.
Note that this config option just enables users to disable the virtual
merging by default. Users can still disable the virtual merging by the
boot parameter.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/Kconfig')
| -rw-r--r-- | arch/powerpc/Kconfig | 13 |
1 files changed, 0 insertions, 13 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 8a54eb8e3768..2e19500921f9 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -313,19 +313,6 @@ config 8XX_MINIMAL_FPEMU It is recommended that you build a soft-float userspace instead. -config IOMMU_VMERGE - bool "Enable IOMMU virtual merging" - depends on PPC64 - default y - help - Cause IO segments sent to a device for DMA to be merged virtually - by the IOMMU when they happen to have been allocated contiguously. - This doesn't add pressure to the IOMMU allocator. However, some - drivers don't support getting large merged segments coming back - from *_map_sg(). - - Most drivers don't have this problem; it is safe to say Y here. - config IOMMU_HELPER def_bool PPC64 |