Patch "config: Enable NEED_DMA_MAP_STATE by default when SWIOTLB is selected" has been added to the 3.10-stable tree
Subsystems (2)
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 3.10-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-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.
Quoted 1 line
From
a6dfa128ce5c414ab46b1d690f7a1b8decb8526dMon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <[email protected]>
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 <[email protected]>
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.
--- arch/x86/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
arch/x86/Kconfig +1 -1
@@ -154,7 +154,7 @@ 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 [email protected] are
queue-3.10/config-enable-need_dma_map_state-by-default-when-swiotlb-is-selected.patch