diff options
| author | Konrad Rzeszutek Wilk <[email protected]> | 2015-04-17 15:04:48 -0400 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2015-04-18 14:36:49 +0200 |
| commit | a6dfa128ce5c414ab46b1d690f7a1b8decb8526d (patch) | |
| tree | 8bd03d40efe6c3f8da5afc301440847c5a05485d | |
| parent | 18ecb3bfa5a9f6fffbb3eeb4369f0b9463438ec0 (diff) | |
config: Enable NEED_DMA_MAP_STATE by default when SWIOTLB is selected
A huge amount of NIC drivers use the DMA API, however if
compiled under 32-bit an very important part of the DMA API can
be ommitted leading to the drivers not working at all
(especially if used with 'swiotlb=force iommu=soft').
As Prashant Sreedharan explains it: "the driver [tg3] uses
DEFINE_DMA_UNMAP_ADDR(), dma_unmap_addr_set() to keep a copy of
the dma "mapping" and dma_unmap_addr() to get the "mapping"
value. On most of the platforms this is a no-op, but ... with
"iommu=soft and swiotlb=force" this house keeping is required,
... otherwise we pass 0 while calling pci_unmap_/pci_dma_sync_
instead of the DMA address."
As such enable this even when using 32-bit kernels.
Reported-by: Ian Jackson <[email protected]>
Signed-off-by: Konrad Rzeszutek Wilk <[email protected]>
Acked-by: David S. Miller <[email protected]>
Acked-by: Prashant Sreedharan <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Michael Chan <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
| -rw-r--r-- | arch/x86/Kconfig | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index faff6934c05a..eb79036e3503 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -177,7 +177,7 @@ config SBUS config NEED_DMA_MAP_STATE def_bool y - depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG + depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG || SWIOTLB config NEED_SG_DMA_LENGTH def_bool y |