linux-toradex.git/arch/powerpc/sysdev/dart_iommu.c, branch v4.2.7

powerpc/iommu: Move tce_xxx callbacks from ppc_md to iommu_table

2015-06-11T05:14:56+00:00

This adds a iommu_table_ops struct and puts pointer to it into
the iommu_table struct. This moves tce_build/tce_free/tce_get/tce_flush
callbacks from ppc_md to the new struct where they really belong to.

This adds the requirement for @it_ops to be initialized before calling
iommu_init_table() to make sure that we do not leave any IOMMU table
with iommu_table_ops uninitialized. This is not a parameter of
iommu_init_table() though as there will be cases when iommu_init_table()
will not be called on TCE tables, for example - VFIO.

This does s/tce_build/set/, s/tce_free/clear/ and removes "tce_"
redundant prefixes.

This removes tce_xxx_rm handlers from ppc_md but does not add
them to iommu_table_ops as this will be done later if we decide to
support TCE hypercalls in real mode. This removes _vm callbacks as
only virtual mode is supported by now so this also removes @rm parameter.

For pSeries, this always uses tce_buildmulti_pSeriesLP/
tce_buildmulti_pSeriesLP. This changes multi callback to fall back to
tce_build_pSeriesLP/tce_free_pSeriesLP if FW_FEATURE_MULTITCE is not
present. The reason for this is we still have to support "multitce=off"
boot parameter in disable_multitce() and we do not want to walk through
all IOMMU tables in the system and replace "multi" callbacks with single
ones.

For powernv, this defines _ops per PHB type which are P5IOC2/IODA1/IODA2.
This makes the callbacks for them public. Later patches will extend
callbacks for IODA1/2.

No change in behaviour is expected.

Signed-off-by: Alexey Kardashevskiy 
Reviewed-by: David Gibson 
Reviewed-by: Gavin Shan 
Signed-off-by: Michael Ellerman

powerpc: dart_iommu: Remove check for controller_ops == NULL case

2015-04-11T10:49:19+00:00

Now that we have ported the calls to iommu_init_early_dart to always
supply a pci_controller_ops struct, we can safely drop the check.

Signed-off-by: Daniel Axtens 
Signed-off-by: Michael Ellerman

powerpc: Remove shims for pci_controller_ops operations

2015-04-11T10:49:18+00:00

Remove shims, patch callsites to use pci_controller_ops
versions instead.

Also move back the probe mode defines, as explained in the patch
for pci_probe_mode.

Signed-off-by: Daniel Axtens 
Signed-off-by: Michael Ellerman

powerpc: dart_iommu: optionally populate controller_ops on init

2015-04-11T10:49:14+00:00

If a pci_controller_ops struct is provided to iommu_init_early_dart,
populate that with the DMA setup ops, rather than ppc_md. If NULL is
provided, populate ppc_md as before.

This also patches the call sites for Maple and Power Mac to pass
NULL, so existing behaviour is preserved.

The benefit of making this optional is that it means we don't have
to change dart, Maple and Power Mac over to the controller_ops
system in one fell swoop.

Signed-off-by: Daniel Axtens 
Signed-off-by: Michael Ellerman

powerpc/kmemleak: Do not scan the DART table

2014-06-24T04:29:46+00:00

The DART table allocation is registered to kmemleak via the
memblock_alloc_base() call. However, the DART table is later unmapped
and dart_tablebase VA no longer accessible. This patch tells kmemleak
not to scan this block and avoid an unhandled paging request.

Signed-off-by: Catalin Marinas 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Signed-off-by: Benjamin Herrenschmidt

powerpc/iommu: Fix initialisation of DART iommu table

2014-01-29T05:58:49+00:00

Commit d084775738b746648d4102337163a04534a02982 switched the generic
powerpc iommu backend code to use the it_page_shift field to determine
page size. Commit 3a553170d35d69bea3877bffa508489dfa6f133d should have
initiliased this field for all platforms, however the DART iommu table
code was not updated.

This commit initialises the it_page_shift field to 4K for the DART
iommu.

Signed-off-by: Alistair Popple 
Signed-off-by: Benjamin Herrenschmidt

powerpc/iommu: Fix multiple issues with IOMMU pools code

2012-10-04T08:03:20+00:00

There are a number of issues in the recent IOMMU pools code:

- On a preempt kernel we might switch CPUs in the middle of building
  a scatter gather list. When this happens the handle hint passed in
  no longer falls within the local CPU's pool. Check for this and
  fall back to the pool hint.

- We were missing a spin_unlock/spin_lock in one spot where we
  switch pools.

- We need to provide locking around dart_tlb_invalidate_all and
  dart_tlb_invalidate_one now that the global lock is gone.

Reported-by: Alexander Graf 
Signed-off-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt 
CC:  [v3.6]

powerpc/dart: Remove uses of virt_to_abs() and abs_to_virt()

2012-09-05T05:18:44+00:00

These days they are just wrappers around __pa() and __va() respectively.

Signed-off-by: Michael Ellerman 
Signed-off-by: Benjamin Herrenschmidt

treewide: Convert uses of struct resource to resource_size(ptr)

2011-06-10T12:55:36+00:00

Several fixes as well where the +1 was missing.

Done via coccinelle scripts like:

@@
struct resource *ptr;
@@

- ptr->end - ptr->start + 1
+ resource_size(ptr)

and some grep and typing.

Mostly uncompiled, no cross-compilers.

Signed-off-by: Joe Perches 
Signed-off-by: Jiri Kosina

powerpc/dart: iommu table cleanup

2010-11-29T04:48:20+00:00

No need to set the device tree device_node pci node iommu pointer, its
only used for dlpar remove.

Signed-off-by: Milton Miller 
Signed-off-by: Nishanth Aravamudan 
Signed-off-by: Benjamin Herrenschmidt