linux-stable.git/include/linux/swiotlb.h, branch v5.0.4

swiotlb: Add is_swiotlb_active() function

2019-03-23T19:11:26+00:00

commit 492366f7b4237257ef50ca9c431a6a0d50225aca upstream.

This function will be used from dma_direct code to determine
the maximum segment size of a dma mapping.

Cc: stable@vger.kernel.org
Reviewed-by: Konrad Rzeszutek Wilk 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Joerg Roedel 
Signed-off-by: Michael S. Tsirkin 
Signed-off-by: Greg Kroah-Hartman

swiotlb: Introduce swiotlb_max_mapping_size()

2019-03-23T19:11:26+00:00

commit abe420bfae528c92bd8cc5ecb62dc95672b1fd6f upstream.

The function returns the maximum size that can be remapped
by the SWIOTLB implementation. This function will be later
exposed to users through the DMA-API.

Cc: stable@vger.kernel.org
Reviewed-by: Konrad Rzeszutek Wilk 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Joerg Roedel 
Signed-off-by: Michael S. Tsirkin 
Signed-off-by: Greg Kroah-Hartman

dma-direct: merge swiotlb_dma_ops into the dma_direct code

2018-12-13T20:06:17+00:00

While the dma-direct code is (relatively) clean and simple we actually
have to use the swiotlb ops for the mapping on many architectures due
to devices with addressing limits.  Instead of keeping two
implementations around this commit allows the dma-direct
implementation to call the swiotlb bounce buffering functions and
thus share the guts of the mapping implementation.  This also
simplified the dma-mapping setup on a few architectures where we
don't have to differenciate which implementation to use.

Signed-off-by: Christoph Hellwig 
Acked-by: Jesper Dangaard Brouer 
Tested-by: Jesper Dangaard Brouer 
Tested-by: Tony Luck

swiotlb: remove SWIOTLB_MAP_ERROR

2018-12-13T20:06:13+00:00

We can use DMA_MAPPING_ERROR instead, which already maps to the same
value.

Signed-off-by: Christoph Hellwig 
Acked-by: Jesper Dangaard Brouer 
Tested-by: Jesper Dangaard Brouer 
Tested-by: Tony Luck

swiotlb: don't dip into swiotlb pool for coherent allocations

2018-10-19T06:48:28+00:00

All architectures that support swiotlb also have a zone that backs up
these less than full addressing allocations (usually ZONE_DMA32).

Because of that it is rather pointless to fall back to the global swiotlb
buffer if the normal dma direct allocation failed - the only thing this
will do is to eat up bounce buffers that would be more useful to serve
streaming mappings.

Signed-off-by: Christoph Hellwig 
Acked-by: Catalin Marinas 
Acked-by: Konrad Rzeszutek Wilk

swiotlb: remove the overflow buffer

2018-10-19T06:43:46+00:00

Like all other dma mapping drivers just return an error code instead
of an actual memory buffer.  The reason for the overflow buffer was
that at the time swiotlb was invented there was no way to check for
dma mapping errors, but this has long been fixed.

Signed-off-by: Christoph Hellwig 
Acked-by: Catalin Marinas 
Reviewed-by: Robin Murphy 
Reviewed-by: Konrad Rzeszutek Wilk

swiotlb: mark is_swiotlb_buffer static

2018-10-19T06:42:39+00:00

Signed-off-by: Christoph Hellwig 
Reviewed-by: Robin Murphy 
Reviewed-by: Konrad Rzeszutek Wilk

dma/swiotlb: Remove swiotlb_{alloc,free}_coherent()

2018-03-20T09:01:59+00:00

Unused now that everyone uses swiotlb_{alloc,free}().

Tested-by: Tom Lendacky 
Signed-off-by: Christoph Hellwig 
Reviewed-by: Thomas Gleixner 
Cc: David Woodhouse 
Cc: Joerg Roedel 
Cc: Jon Mason 
Cc: Konrad Rzeszutek Wilk 
Cc: Linus Torvalds 
Cc: Muli Ben-Yehuda 
Cc: Peter Zijlstra 
Cc: iommu@lists.linux-foundation.org
Link: http://lkml.kernel.org/r/20180319103826.12853-15-hch@lst.de
Signed-off-by: Ingo Molnar

swiotlb: add common swiotlb_map_ops

2018-01-15T08:35:45+00:00

Currently all architectures that want to use swiotlb have to implement
their own dma_map_ops instances.  Provide a generic one based on the
x86 implementation which first calls into dma_direct to try a full blown
direct mapping implementation (including e.g. CMA) before falling back
allocating from the swiotlb buffer.

Signed-off-by: Christoph Hellwig 
Acked-by: Christian König

swiotlb: rename swiotlb_free to swiotlb_exit

2018-01-15T08:35:39+00:00

Signed-off-by: Christoph Hellwig 
Acked-by: Christian König 
Reviewed-by: Konrad Rzeszutek Wilk