This is a note to let you know that I have just added a patch titled
config: Enable NEED_DMA_MAP_STATE by default when SWIOTLB is selected
to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree
which can be found at:
http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.16.y-queue
This patch is scheduled to be released in version 3.16.7-ckt13.
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Luis
------
>From 13242f9325fc927df3d3f32b0b5685bf419aa994 Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.w...@oracle.com>
Date: Fri, 17 Apr 2015 15:04:48 -0400
Subject: config: Enable NEED_DMA_MAP_STATE by default when SWIOTLB is selected
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.jack...@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.w...@oracle.com>
Acked-by: David S. Miller <da...@davemloft.net>
Acked-by: Prashant Sreedharan <prash...@broadcom.com>
Cc: Borislav Petkov <b...@alien8.de>
Cc: H. Peter Anvin <h...@zytor.com>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Michael Chan <mc...@broadcom.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: boris.ostrov...@oracle.com
Cc: casca...@linux.vnet.ibm.com
Cc: david.vra...@citrix.com
Cc: sanje...@broadcom.com
Cc: siva.kal...@broadcom.com
Cc: vyasev...@gmail.com
Cc: xen-de...@lists.xensource.com
Link: http://lkml.kernel.org/r/20150417190448.ga9...@l.oracle.com
Signed-off-by: Ingo Molnar <mi...@kernel.org>
Cc: Ben Hutchings <b...@decadent.org.uk>
Signed-off-by: Luis Henriques <luis.henriq...@canonical.com>
---
arch/x86/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 12c8ea635f4d..04fe4a66c3ec 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -164,7 +164,7 @@ 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
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