This code has been spread between getting in through arch trees, the iommu
tree, -mm and the drivers tree.  There will be a lot of work in this area,
including consolidating various arch implementations into more common
code, so ensure we have a proper git tree that facilitates cooperation with
the architecture maintainers.
Signed-off-by: Christoph Hellwig <hch@lst.de>

Signed-off-by: Christoph Hellwig <hch@lst.de>

Signed-off-by: Christoph Hellwig <hch@lst.de>

Besides removing the last instance of the set_dma_mask method this also
reduced the code duplication.
Signed-off-by: Christoph Hellwig <hch@lst.de>

By the time cell_pci_dma_dev_setup calls cell_dma_dev_setup no device can
have the fixed map_ops set yet as it's only set by the set_dma_mask
method.  So move the setup for the fixed case to be only called in that
place instead of indirecting through cell_dma_dev_setup.
Signed-off-by: Christoph Hellwig <hch@lst.de>

These just duplicate the default behavior if no method is provided.
Signed-off-by: Christoph Hellwig <hch@lst.de>

This just duplicates the generic implementation.
Signed-off-by: Christoph Hellwig <hch@lst.de>

Same behavior, less code duplication.
Signed-off-by: Christoph Hellwig <hch@lst.de>

Same behavior, less code duplication.
Signed-off-by: Christoph Hellwig <hch@lst.de>

Signed-off-by: Christoph Hellwig <hch@lst.de>

And instead wire it up as method for all the dma_map_ops instances.

Note that this also means the arch specific check will be fully instead
of partially applied in the AMD iommu driver.
Signed-off-by: Christoph Hellwig <hch@lst.de>

And instead wire it up as method for all the dma_map_ops instances.

Note that the code seems a little fishy for dmabounce and iommu, but
for now I'd like to preserve the existing behavior 1:1.
Signed-off-by: Christoph Hellwig <hch@lst.de>

This implementation is simply bogus - openrisc only has a simple
direct mapped DMA implementation and thus doesn't care about the
address.
Signed-off-by: Christoph Hellwig <hch@lst.de>

Signed-off-by: Christoph Hellwig <hch@lst.de>

This implementation is simply bogus - hexagon only has a simple
direct mapped DMA implementation and thus doesn't care about the
address.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Richard Kuo <rkuo@codeaurora.org>

These just duplicate the default behavior if no method is provided.
Signed-off-by: Christoph Hellwig <hch@lst.de>

These just duplicate the default behavior if no method is provided.
Signed-off-by: Christoph Hellwig <hch@lst.de>

Usually dma_supported decisions are done by the dma_map_ops instance.
Switch sparc to that model by providing a ->dma_supported instance for
sbus that always returns false, and implementations tailored to the sun4u
and sun4v cases for sparc64, and leave it unimplemented for PCI on
sparc32, which means always supported.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: David S. Miller <davem@davemloft.net>

We can just use pci32_dma_ops directly.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: David S. Miller <davem@davemloft.net>

And update the documentation - dma_mapping_error has been supported
everywhere for a long time.
Signed-off-by: Christoph Hellwig <hch@lst.de>

DMA_ERROR_CODE is going to go away, so don't rely on it.
Signed-off-by: Christoph Hellwig <hch@lst.de>

All dma_map_ops instances now handle their errors through
->mapping_error.
Signed-off-by: Christoph Hellwig <hch@lst.de>

DMA_ERROR_CODE is going to go away, so don't rely on it.
Signed-off-by: Christoph Hellwig <hch@lst.de>

DMA_ERROR_CODE is going to go away, so don't rely on it.
Signed-off-by: Christoph Hellwig <hch@lst.de>

DMA_ERROR_CODE is going to go away, so don't rely on it.  Instead
define a ->mapping_error method for all IOMMU based dma operation
instances.  The direct ops don't ever return an error and don't
need a ->mapping_error method.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>

DMA_ERROR_CODE is going to go away, so don't rely on it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: David S. Miller <davem@davemloft.net>

s390 can also use noop_dma_ops, and while that currently does not return
errors it will so in the future.  Implementing the mapping_error method
is the proper way to have per-ops error conditions.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>

DMA_ERROR_CODE is going to go away, so don't rely on it.
Signed-off-by: Christoph Hellwig <hch@lst.de>

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Richard Kuo <rkuo@codeaurora.org>

The dma alloc interface returns an error by return NULL, and the
mapping interfaces rely on the mapping_error method, which the dummy
ops already implement correctly.

Thus remove the DMA_ERROR_CODE define.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>

xtensa already implements the mapping_error method for its only
dma_map_ops instance.
Signed-off-by: Christoph Hellwig <hch@lst.de>

sh does not return errors for dma_map_page.
Signed-off-by: Christoph Hellwig <hch@lst.de>

openrisc does not return errors for dma_map_page.
Signed-off-by: Christoph Hellwig <hch@lst.de>

microblaze does not return errors for dma_map_page.
Signed-off-by: Christoph Hellwig <hch@lst.de>

dma-noop is the only dma_mapping_ops instance for m32r and does not return
errors.
Signed-off-by: Christoph Hellwig <hch@lst.de>

All ia64 dma_mapping_ops instances already have a mapping_error member.
Signed-off-by: Christoph Hellwig <hch@lst.de>

Signed-off-by: Christoph Hellwig <hch@lst.de>

DMA_ERROR_CODE is going to go away, so don't rely on it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

ARM and x86 had duplicated versions of the dma_ops structure, the
only difference is that x86 hasn't wired up the set_dma_mask,
mmap, and get_sgtable ops yet.  On x86 all of them are identical
to the generic version, so they aren't needed but harmless.

All the symbols used only for xen_swiotlb_dma_ops can now be marked
static as well.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

DMA_ERROR_CODE is not a public API and will go away soon.  dma dma-iommu
driver already implements a proper ->mapping_error method, so it's only
using the value internally.  Add a new local define using the value
that arm64 which is the only current user of dma-iommu.
Signed-off-by: Christoph Hellwig <hch@lst.de>