Signed-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NRobin Murphy <robin.murphy@arm.com>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

For entirely dma coherent architectures there is no requirement to ever
remap dma coherent allocation.  Move all the remap and pool code under
IS_ENABLED() checks and drop the Kconfig dependency.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NRobin Murphy <robin.murphy@arm.com>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

Inline __iommu_dma_mmap_pfn into the main function, and use the
fact that __iommu_dma_get_pages return NULL for remapped contigous
allocations to simplify the code flow a bit.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NRobin Murphy <robin.murphy@arm.com>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

Inline __iommu_dma_get_sgtable_page into the main function, and use the
fact that __iommu_dma_get_pages return NULL for remapped contigous
allocations to simplify the code flow a bit.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NRobin Murphy <robin.murphy@arm.com>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

All the logic in iommu_dma_alloc that deals with page allocation from
the CMA or page allocators can be split into a self-contained helper,
and we can than map the result of that or the atomic pool allocation
with the iommu later.  This also allows reusing __iommu_dma_free to
tear down the allocations and MMU mappings when the IOMMU mapping
fails.

Based on a patch from Robin Murphy.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

Most importantly clear up the size / iosize confusion.  Also rename addr
to cpu_addr to match the surrounding code and make the intention a little
more clear.
Signed-off-by: NRobin Murphy <robin.murphy@arm.com>
[hch: split from a larger patch]
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

Most of it can double up to serve the failure cleanup path for
iommu_dma_alloc().
Signed-off-by: NRobin Murphy <robin.murphy@arm.com>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

Instead of having a separate code path for the non-blocking alloc_pages
and CMA allocations paths merge them into one.  There is a slight
behavior change here in that we try the page allocator if CMA fails.
This matches what dma-direct and other iommu drivers do and will be
needed to use the dma-iommu code on architectures without DMA remapping
later on.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

Always remapping CMA allocations was largely a bodge to keep the freeing
logic manageable when it was split between here and an arch wrapper. Now
that it's all together and streamlined, we can relax that limitation.
Signed-off-by: NRobin Murphy <robin.murphy@arm.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

Shuffle around the self-contained atomic and non-contiguous cases to
return early and get out of the way of the CMA case that we're about to
work on next.
Signed-off-by: NRobin Murphy <robin.murphy@arm.com>
[hch: slight changes to the code flow]
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

The freeing logic was made particularly horrible by part of it being
opaque to the arch wrapper, which led to a lot of convoluted repetition
to ensure each path did everything in the right order. Now that it's
all private, we can pick apart and consolidate the logically-distinct
steps of freeing the IOMMU mapping, the underlying pages, and the CPU
remap (if necessary) into something much more manageable.
Signed-off-by: NRobin Murphy <robin.murphy@arm.com>
[various cosmetic changes to the code flow]
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

We only have a single caller of this function left, so open code it there.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NRobin Murphy <robin.murphy@arm.com>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

Move the call to dma_common_pages_remap into __iommu_dma_alloc and
rename it to iommu_dma_alloc_remap.  This creates a self-contained
helper for remapped pages allocation and mapping.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NRobin Murphy <robin.murphy@arm.com>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

Since we duplicate the find_vm_area() logic a few times in places where
we only care aboute the pages, factor out a helper to abstract it.
Signed-off-by: NRobin Murphy <robin.murphy@arm.com>
[hch: don't warn when not finding a region, as we'll rely on that later]
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

The remaining internal callsites don't care about having prototypes
compatible with the relevant dma_map_ops callbacks, so the extra
level of indirection just wastes space and complictaes things.
Signed-off-by: NRobin Murphy <robin.murphy@arm.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

Most of the callers don't care, and the couple that do already have the
domain to hand for other reasons are in slow paths where the (trivial)
overhead of a repeated lookup will be utterly immaterial.
Signed-off-by: NRobin Murphy <robin.murphy@arm.com>
[hch: dropped the hunk touching iommu_dma_get_msi_page to avoid a
 conflict with another series]
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

Moving this function up to its unmap counterpart helps to keep related
code together for the following changes.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NRobin Murphy <robin.murphy@arm.com>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

There is nothing really arm64 specific in the iommu_dma_ops
implementation, so move it to dma-iommu.c and keep a lot of symbols
self-contained.  Note the implementation does depend on the
DMA_DIRECT_REMAP infrastructure for now, so we'll have to make the
DMA_IOMMU support depend on it, but this will be relaxed soon.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NRobin Murphy <robin.murphy@arm.com>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

arch_dma_prep_coherent can handle physically contiguous ranges larger
than PAGE_SIZE just fine, which means we don't need a page-based
iterator.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NRobin Murphy <robin.murphy@arm.com>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

We now have a arch_dma_prep_coherent architecture hook that is used
for the generic DMA remap allocator, and we should use the same
interface for the dma-iommu code.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NRobin Murphy <robin.murphy@arm.com>
Acked-by: NCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

Fixes: eb9d1bf0: "random: only read from /dev/random after its pool has received 128 bits"
Reported-by: Nkernel test robot <lkp@intel.com>
Signed-off-by: NTheodore Ts'o <tytso@mit.edu>

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extracted by the scancode license scanner the SPDX license identifier

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Based on 1 normalized pattern(s):

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extracted by the scancode license scanner the SPDX license identifier

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extracted by the scancode license scanner the SPDX license identifier

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has been chosen to replace the boilerplate/reference in 8 file(s).
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Reviewed-by: NRichard Fontana <rfontana@redhat.com>
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has been chosen to replace the boilerplate/reference in 26 file(s).
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extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1 file(s).
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  implied warranty of merchantability or fitness for a particular
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extracted by the scancode license scanner the SPDX license identifier

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has been chosen to replace the boilerplate/reference in 1 file(s).
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Based on 1 normalized pattern(s):

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  with atmel wireless lan drivers if not see http www gnu org licenses

extracted by the scancode license scanner the SPDX license identifier

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Based on 1 normalized pattern(s):

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  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  51 franklin st fifth floor boston ma 02110 1301 usa

extracted by the scancode license scanner the SPDX license identifier

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Based on 1 normalized pattern(s):

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  should have received a copy of the gnu general public license along
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  59 temple place suite 330 boston ma 02111 1307 usa

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Based on 1 normalized pattern(s):

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extracted by the scancode license scanner the SPDX license identifier

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Based on 1 normalized pattern(s):

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  should have received a copy of the gnu general public license along
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  this program is free software you can redistribute it and or modify
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  [bill]@[thedirks] [org] [based] [on] [code] [by] [alan] [cox]
  [alan]@[cymru] [net] video capture interface for linux a generic
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Based on 1 normalized pattern(s):

  this source code is licensed under the gnu general public license
  version 2 or later see the file copying for more details

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1 file(s).
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Reviewed-by: NAllison Randal <allison@lohutok.net>
Reviewed-by: NKate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: NRichard Fontana <rfontana@redhat.com>
Reviewed-by: NArmijn Hemel <armijn@tjaldur.nl>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190520075211.129205147@linutronix.deSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

Based on 1 normalized pattern(s):

  licensed under the gpl v2 or later

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1 file(s).
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Reviewed-by: NAllison Randal <allison@lohutok.net>
Reviewed-by: NRichard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190520075210.947402145@linutronix.deSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>