This is a note to let you know that I've just added the patch titled
config: Enable NEED_DMA_MAP_STATE by default when SWIOTLB is selected
to the 4.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
config-enable-need_dma_map_state-by-default-when-swiotlb-is-selected.patch
and it can be found in the queue-4.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a6dfa128ce5c414ab46b1d690f7a1b8decb8526d Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Fri, 17 Apr 2015 15:04:48 -0400
Subject: config: Enable NEED_DMA_MAP_STATE by default when SWIOTLB is selected
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
commit a6dfa128ce5c414ab46b1d690f7a1b8decb8526d upstream.
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 <Ian.Jackson@xxxxxxxxxxxxx>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Acked-by: David S. Miller <davem@xxxxxxxxxxxxx>
Acked-by: Prashant Sreedharan <prashant@xxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Michael Chan <mchan@xxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: boris.ostrovsky@xxxxxxxxxx
Cc: cascardo@xxxxxxxxxxxxxxxxxx
Cc: david.vrabel@xxxxxxxxxx
Cc: sanjeevb@xxxxxxxxxxxx
Cc: siva.kallam@xxxxxxxxxxxx
Cc: vyasevich@xxxxxxxxx
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/20150417190448.GA9462@xxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- 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
Patches currently in stable-queue which might be from konrad.wilk@xxxxxxxxxx are
queue-4.0/config-enable-need_dma_map_state-by-default-when-swiotlb-is-selected.patch
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