Commit Graph

47 Commits

Author SHA1 Message Date
Joerg Roedel 4c5e9d9f0d Merge branches 'x86/vt-d', 'x86/amd', 'arm/omap', 'ppc/pamu', 'arm/smmu', 'arm/exynos' and 'core' into next 2014-07-31 20:29:02 +02:00
Mitchel Humpherys 2907320df3 iommu/arm-smmu: fix some checkpatch issues
Fix some issues reported by checkpatch.pl. Mostly whitespace, but also
includes min=>min_t, kzalloc=>kcalloc, and kmalloc=>kmalloc_array.

The only issue I'm leaving alone is:

    arm-smmu.c:853: WARNING: line over 80 characters
    #853: FILE: arm-smmu.c:853:
    +                     (MAIR_ATTR_WBRWA << MAIR_ATTR_SHIFT(MAIR_ATTR_IDX_CACHE)) |

since it seems to be a case where "exceeding 80 columns significantly
increases readability and does not hide information."
(Documentation/CodingStyle).

Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-07-09 10:38:23 +01:00
Thierry Reding b22f6434cf iommu: Constify struct iommu_ops
This structure is read-only data and should never be modified.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2014-07-07 10:36:59 +02:00
Will Deacon d3bca16635 iommu/arm-smmu: fix capability checking prior to device attach
If somebody attempts to check the capability of an IOMMU domain prior to
device attach, then we'll try to dereference a NULL SMMU pointer through
the SMMU domain (since we can't determine the actual SMMU instance until
we have a device attached).

This patch fixes the capability check so that non-global features are
reported as being absent when no device is attached to the domain.

Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-07-04 13:16:05 +01:00
Will Deacon 9c5c92e35c iommu/arm-smmu: prefer stage-1 mappings where we have a choice
For an SMMU that supports both Stage-1 and Stage-2 mappings (but not
nested translation), then we should prefer stage-1 mappings as we
otherwise rely on the memory attributes of the incoming transactions
for IOMMU_CACHE mappings.

Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-07-03 15:50:22 +01:00
Will Deacon 44680eedf9 iommu/arm-smmu: remove support for chained SMMUs
The ARM SMMU driver has supported chained SMMUs (i.e. SMMUs connected
back-to-back in series) via the smmu-parent property in device tree.
This was in anticipation of somebody building such a configuration,
however that seems not to be the case.

This patch removes the unused chained SMMU hack from the driver. We can
consider adding it back later if somebody decided they need it, but for
the time being it's just pointless mess that we're carrying in mainline.

Removal of the feature also makes migration to the generic IOMMU bindings
easier.

Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-07-03 15:50:22 +01:00
Will Deacon d094894563 iommu/arm-smmu: caps: add IOMMU_CAP_INTR_REMAP capability
MSIs are just seen as bog standard memory writes by the ARM SMMU, so
they can be translated (and isolated) in the same way.

This patch adds the IOMMU_CAP_INTR_REMAP capability to the ARM SMMU
driver and reworks our capabaility code so that we don't assume the
caps are organised as bits in a bitmask (since this isn't the intention).

Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-07-03 15:50:22 +01:00
Will Deacon a9a1b0b53d iommu/arm-smmu: add support for PCI master devices
This patch extends the ARM SMMU driver so that it can handle PCI master
devices in addition to platform devices described in the device tree.

The driver is informed about the PCI host controller in the DT via a
phandle to the host controller in the mmu-masters property. The host
controller is then added to the master tree for that SMMU, just like a
normal master (although it probably doesn't advertise any StreamIDs).

When a device is added to the PCI bus, we set the archdata.iommu pointer
for that device to describe its StreamID (actually its RequesterID for
the moment). This allows us to re-use our existing data structures using
the host controller of_node for everything apart from StreamID
configuration, where we reach into the archdata for the information we
require.

Cc: Varun Sethi <varun.sethi@freescale.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-07-03 15:50:21 +01:00
Will Deacon a65217a4bc iommu/arm-smmu: fix calculation of TCR.T0SZ
T0SZ controls the input address range for TTBR0, so use the input
address range rather than the output address range for the calculation.
For stage-2, this means using the output size of stage-1.

Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-07-02 11:55:49 +01:00
Kefeng Wang 6069d23ce0 iommu/arm-smmu: fix incorrect use of S2CR_TYPE_SHIFT
There is already S2CR_TYPE_SHIFT in S2CR_TYPE_TRANS macro, so drop the
second shift. Note that, since S2CR_TYPE_SHIFT is 0x0, there is no
functional change introduced by this patch.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-05-02 16:49:37 +01:00
Will Deacon c44308413b iommu/arm-smmu: allow 42-bit stage-1 output size with 64K pages
The output size of stage-1 is currently limited by the input size of
stage-2, which is further limited by VA_BITS since we make use of the
standard pgd_alloc functions for creating page tables.

This patch ensures that we use VA_BITS instead of a hardcoded '39'
for the stage-1 output size limit.

Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-05-02 16:49:31 +01:00
Bin Wang aca1bc4595 iommu/arm-smmu: fix panic in arm_smmu_alloc_init_pte
kernel panic happened when iommu_unmap a buffer larger than 2MB,
more than expected pmd entries got “invalidated”, due to a wrong range
passed to arm_smmu_alloc_init_pte. it was likely a typo, now we fix
it, passing the correct "end" address to arm_smmu_alloc_init_pte.

Signed-off-by: Bin Wang <binw@marvell.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-04-15 12:23:11 +01:00
Laurent Pinchart 16c50dcfc4 iommu/arm-smmu: Return 0 on unmap failure
The IOMMU core expects the unmap operation to return the number of bytes
that have been unmapped or 0 on failure, a negative return value being
treated like a number of bytes.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-04-15 12:19:33 +01:00
Will Deacon 34fb4b37b7 iommu/arm-smmu: fix incorrect comment regarding TLB invalidation
Commit 1463fe44fd ("iommu/arm-smmu: Don't use VMIDs for stage-1
translations") moved our TLB invalidation from context creation time to
context destruction time, but forgot to update an associated comment.

This patch fixes the broken comment.

Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-02-27 19:08:43 +00:00
Will Deacon 3aa80ea4c9 iommu/arm-smmu: provide option to dsb macro when publishing tables
On coherent systems, publishing new page tables to the SMMU walker is
achieved with a dsb instruction. In fact, this can be a dsb(ishst) which
also provides the mandatory barrier option for arm64.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-02-24 19:09:46 +00:00
Will Deacon b410aed932 iommu/arm-smmu: clean up use of `flags' in page table handling code
Commit 972157cac5 ("arm/smmu: Use irqsafe spinlock for domain lock")
fixed our page table locks to be the irq{save,restore} variants, since
the DMA mapping API can be invoked from interrupt context.

This patch cleans up our use of the flags variable so we can distinguish
between IRQ flags (now `flags') and pte protection bits (now `prot').

Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-02-24 19:09:45 +00:00
Andreas Herrmann 3a5df8ff35 iommu/arm-smmu: support buggy implementations with secure cfg accesses
In such a case we have to use secure aliases of some non-secure
registers.

This handling is switched on by DT property
"calxeda,smmu-secure-config-access" for an SMMU node.

Signed-off-by: Andreas Herrmann <andreas.herrmann@calxeda.com>
[will: merged with driver option handling patch]
Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-02-24 19:09:44 +00:00
Andreas Herrmann 636e97b0fb iommu/arm-smmu: set MAX_MASTER_STREAMIDS to MAX_PHANDLE_ARGS
The DT parsing code that determines stream IDs uses
of_parse_phandle_with_args and thus MAX_MASTER_STREAMIDS
is always bound by MAX_PHANDLE_ARGS.

Signed-off-by: Andreas Herrmann <andreas.herrmann@calxeda.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-02-24 19:09:43 +00:00
Joerg Roedel 972157cac5 arm/smmu: Use irqsafe spinlock for domain lock
As the lock might be used through DMA-API which is allowed
in interrupt context.

Signed-off-by: Joerg Roedel <joro@8bytes.org>
Acked-by: Will Deacon <will.deacon@arm.com>
2014-02-20 13:04:47 +01:00
Will Deacon d123cf82d3 iommu/arm-smmu: fix compilation issue when !CONFIG_ARM_AMBA
If !CONFIG_ARM_AMBA, we shouldn't try to register ourselves with the
amba_bustype.

Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-02-10 17:02:27 +00:00
Will Deacon 57ca90f680 iommu/arm-smmu: set CBARn.BPSHCFG to NSH for s1-s2-bypass contexts
Whilst trying to bring-up an SMMUv2 implementation with the table
walker plumbed into a coherent interconnect, I noticed that the memory
transactions targetting the CPU caches from the SMMU were marked as
outer-shareable instead of inner-shareable.

After a bunch of digging, it seems that we actually need to program
CBARn.BPSHCFG for s1-s2-bypass contexts to act as non-shareable in order
for the shareability configured in the corresponding TTBCR not to be
overridden with an outer-shareable attribute.

Cc: <stable@vger.kernel.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-02-10 17:02:23 +00:00
Will Deacon 6dd35f45b8 iommu/arm-smmu: fix table flushing during initial allocations
Now that we populate page tables as we traverse them ("iommu/arm-smmu:
fix pud/pmd entry fill sequence"), we need to ensure that we flush out
our zeroed tables after initial allocation, to prevent speculative TLB
fills using bogus data.

This patch adds additional calls to arm_smmu_flush_pgtable during
initial table allocation, and moves the dsb required by coherent table
walkers into the helper.

Cc: <stable@vger.kernel.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-02-10 17:02:17 +00:00
Will Deacon c9d09e2748 iommu/arm-smmu: really fix page table locking
Commit a44a9791e7 ("iommu/arm-smmu: use mutex instead of spinlock for
locking page tables") replaced the page table spinlock with a mutex, to
allow blocking allocations to satisfy lazy mapping requests.

Unfortunately, it turns out that IOMMU mappings are created from atomic
context (e.g. spinlock held during a dma_map), so this change doesn't
really help us in practice.

This patch is a partial revert of the offending commit, bringing back
the original spinlock but replacing our page table allocations for any
levels below the pgd (which is allocated during domain init) with
GFP_ATOMIC instead of GFP_KERNEL.

Cc: <stable@vger.kernel.org>
Reported-by: Andreas Herrmann <andreas.herrmann@calxeda.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-02-10 17:00:49 +00:00
Yifan Zhang 97a644208d iommu/arm-smmu: fix pud/pmd entry fill sequence
The ARM SMMU driver's population of puds and pmds is broken, since we
iterate over the next level of table repeatedly setting the current
level descriptor to point at the pmd being initialised. This is clearly
wrong when dealing with multiple pmds/puds.

This patch fixes the problem by moving the pud/pmd population out of the
loop and instead performing it when we allocate the next level (like we
correctly do for ptes already). The starting address for the next level
is then calculated prior to entering the loop.

Cc: <stable@vger.kernel.org>
Signed-off-by: Yifan Zhang <zhangyf@marvell.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-02-10 17:00:47 +00:00
Will Deacon cf2d45b19d iommu/arm-smmu: add support for IOMMU_EXEC
Previously, all of our mappings were marked as executable, which isn't
usually required. Now that we have the IOMMU_EXEC flag, use that to
determine whether or not a mapping should be marked as executable.

Signed-off-by: Will Deacon <will.deacon@arm.com>
2013-12-16 19:30:32 +00:00
Will Deacon 06f983dd57 iommu/arm-smmu: use VA_BITS to determine arm64 virtual address space
With the introduction of the VA_BITS definition for arm64, make use of
it in the driver, allowing up to 42-bits of VA space when configured
with 64k pages.

Signed-off-by: Will Deacon <will.deacon@arm.com>
2013-12-16 19:30:30 +00:00
Antonios Motakis 5fc63a7c44 iommu/arm-smmu: add devices attached to the SMMU to an IOMMU group
IOMMU groups are expected by certain users of the IOMMU API,
e.g. VFIO. Add new devices found by the SMMU driver to an IOMMU
group to satisfy those users.

Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Antonios Motakis <a.motakis@virtualopensystems.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2013-12-16 19:30:28 +00:00
Wei Yongjun 89a23cde75 iommu/arm-smmu: fix error return code in arm_smmu_device_dt_probe()
Fix to return -ENODEV instead of 0 when context interrupt number
does no match in arm_smmu_device_dt_probe().

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2013-12-06 16:44:25 +00:00
Will Deacon 5552ecdbf9 iommu/arm-smmu: remove potential NULL dereference on mapping path
When handling mapping requests, we dereference the SMMU domain before
checking that it is NULL. This patch fixes the issue by removing the check
altogether, since we don't actually use the leaf_smmu when creating
mappings.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2013-12-06 16:44:25 +00:00
Will Deacon a44a9791e7 iommu/arm-smmu: use mutex instead of spinlock for locking page tables
When creating IO mappings, we lazily allocate our page tables using the
standard, non-atomic allocator functions. This presents us with a
problem, since our page tables are protected with a spinlock.

This patch reworks the smmu_domain lock to use a mutex instead of a
spinlock. iova_to_phys is then reworked so that it only reads the page
tables, and can run in a lockless fashion, leaving the mutex to guard
against concurrent mapping threads.

Cc: <stable@vger.kernel.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2013-12-06 16:44:13 +00:00
Linus Torvalds 91838e2dab IOMMU Updates for Linux v3.13
This time the updates contain:
 
 * Tracepoints for certain IOMMU-API functions to make
   their use easier to debug
 * A tracepoint for IOMMU page faults to make it easier
   to get them in user space
 * Updates and fixes for the new ARM SMMU driver after
   the first hardware showed up
 * Various other fixes and cleanups in other IOMMU drivers
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Merge tag 'iommu-updates-v3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull IOMMU updates from Joerg Roedel:
 "This time the updates contain:

   - Tracepoints for certain IOMMU-API functions to make their use
     easier to debug
   - A tracepoint for IOMMU page faults to make it easier to get them in
     user space
   - Updates and fixes for the new ARM SMMU driver after the first
     hardware showed up
   - Various other fixes and cleanups in other IOMMU drivers"

* tag 'iommu-updates-v3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (26 commits)
  iommu/shmobile: Enable the driver on all ARM platforms
  iommu/tegra-smmu: Staticize tegra_smmu_pm_ops
  iommu/tegra-gart: Staticize tegra_gart_pm_ops
  iommu/vt-d: Use list_for_each_entry_safe() for dmar_domain->devices traversal
  iommu/vt-d: Use for_each_drhd_unit() instead of list_for_each_entry()
  iommu/vt-d: Fixed interaction of VFIO_IOMMU_MAP_DMA with IOMMU address limits
  iommu/arm-smmu: Clear global and context bank fault status registers
  iommu/arm-smmu: Print context fault information
  iommu/arm-smmu: Check for num_context_irqs > 0 to avoid divide by zero exception
  iommu/arm-smmu: Refine check for proper size of mapped region
  iommu/arm-smmu: Switch to subsys_initcall for driver registration
  iommu/arm-smmu: use relaxed accessors where possible
  iommu/arm-smmu: replace devm_request_and_ioremap by devm_ioremap_resource
  iommu: Remove stack trace from broken irq remapping warning
  iommu: Change iommu driver to call io_page_fault trace event
  iommu: Add iommu_error class event to iommu trace
  iommu/tegra: gart: cleanup devm_* functions usage
  iommu/tegra: Print phys_addr_t using %pa
  iommu: No need to pass '0x' when '%pa' is used
  iommu: Change iommu driver to call unmap trace event
  ...
2013-11-15 14:02:18 +09:00
Kirill A. Shutemov 01058e7076 iommu/arm-smmu: handle pgtable_page_ctor() fail
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-15 09:32:19 +09:00
Andreas Herrmann 659db6f6be iommu/arm-smmu: Clear global and context bank fault status registers
After reset these registers have unknown values.
This might cause problems when evaluating SMMU_GFSR and/or SMMU_CB_FSR
in handlers for combined interrupts.

Signed-off-by: Andreas Herrmann <andreas.herrmann@calxeda.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2013-10-09 14:14:41 +01:00
Andreas Herrmann 2ef0f03120 iommu/arm-smmu: Print context fault information
Print context fault information when the fault was not handled by
report_iommu_fault.

Signed-off-by: Andreas Herrmann <andreas.herrmann@calxeda.com>
[will: fixed string formatting]
Signed-off-by: Will Deacon <will.deacon@arm.com>
2013-10-09 14:14:40 +01:00
Andreas Herrmann 44a08de2aa iommu/arm-smmu: Check for num_context_irqs > 0 to avoid divide by zero exception
With the right (or wrong;-) definition of v1 SMMU node in DTB it is
possible to trigger a division by zero in arm_smmu_init_domain_context
(if number of context irqs is 0):

       if (smmu->version == 1) {
               root_cfg->irptndx = atomic_inc_return(&smmu->irptndx);
 =>            root_cfg->irptndx %= smmu->num_context_irqs;
       } else {

Avoid this by checking for num_context_irqs > 0 when probing
for SMMU devices.

Signed-off-by: Andreas Herrmann <andreas.herrmann@calxeda.com>
[will: changed to dev_err on probe failure path]
Signed-off-by: Will Deacon <will.deacon@arm.com>
2013-10-09 14:14:40 +01:00
Andreas Herrmann c55af7f719 iommu/arm-smmu: Refine check for proper size of mapped region
There is already a check to print a warning if the size of SMMU
address space (calculated from SMMU register values) is greater than
the size of the mapped memory region (e.g. passed via DT to the
driver).

Adapt this check to print also a warning in case the mapped region is
larger than the SMMU address space.

Such a mismatch could be intentional (to fix wrong register values).
If its not intentional (e.g. due to wrong DT information) this will
very likely cause a malfunction of the driver as SMMU_CB_BASE is
derived from the size of the mapped region. The warning helps to
identify the root cause in this case.

Signed-off-by: Andreas Herrmann <andreas.herrmann@calxeda.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2013-10-09 14:14:39 +01:00
Andreas Herrmann b1950b2796 iommu/arm-smmu: Switch to subsys_initcall for driver registration
This should ensure that arm-smmu is initialized before other drivers
start handling devices that propably need smmu support.

Signed-off-by: Andreas Herrmann <andreas.herrmann@calxeda.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2013-10-09 14:14:39 +01:00
Will Deacon 25724841df iommu/arm-smmu: use relaxed accessors where possible
Apart from fault handling and page table manipulation, we don't care
about memory ordering between SMMU control registers and normal,
cacheable memory, so use the _relaxed I/O accessors wherever possible.

Signed-off-by: Will Deacon <will.deacon@arm.com>
2013-10-09 14:14:38 +01:00
Julia Lawall 8a7f431221 iommu/arm-smmu: replace devm_request_and_ioremap by devm_ioremap_resource
Use devm_ioremap_resource instead of devm_request_and_ioremap.

This was partly done using the semantic patch
scripts/coccinelle/api/devm_ioremap_resource.cocci

The error-handling code on the call to platform_get_resource was removed
manually, and the initialization of smmu->size was manually moved lower, to
take advantage of the NULL test on res performed by devm_ioremap_resource.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2013-10-09 14:14:38 +01:00
Will Deacon fd90cecbde iommu/arm-smmu: don't enable SMMU device until probing has completed
We currently reset and enable the SMMU before the device has finished
being probed, so if we fail later on (for example, because we couldn't
request a global irq successfully) then we will leave the device in an
active state.

This patch delays the reset and enabling of the SMMU hardware until
probing has completed.

Cc: <stable@vger.kernel.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2013-09-17 12:03:11 +01:00
Dan Carpenter 6614ee77f4 iommu/arm-smmu: fix iommu_present() test in init
The extra semi-colon on the end breaks the test.

Cc: <stable@vger.kernel.org>
Tested-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2013-09-17 12:03:11 +01:00
Dan Carpenter faea13b72d iommu/arm-smmu: fix a signedness bug
Unsigned char is never equal to -1.

Cc: <stable@vger.kernel.org>
Tested-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2013-09-17 12:03:10 +01:00
Will Deacon ecfadb6e5b iommu/arm-smmu: Simplify VMID and ASID allocation
We only use ASIDs and VMIDs to identify individual stage-1 and stage-2
context-banks respectively, so rather than allocate these separately
from the context-banks, just calculate them based on the context bank
index.

Note that VMIDs are offset by 1, since VMID 0 is reserved for stage-1.
This doesn't cause us any issues with the numberspaces, since the
maximum number of context banks is half the minimum number of VMIDs.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>
2013-08-14 12:10:02 +02:00
Will Deacon 1463fe44fd iommu/arm-smmu: Don't use VMIDs for stage-1 translations
Although permitted by the architecture, using VMIDs for stage-1
translations causes a complete nightmare for hypervisors, who end up
having to virtualise the VMID space across VMs, which may be using
multiple VMIDs each.

To make life easier for hypervisors (which might just decide not to
support this VMID virtualisation), this patch reworks the stage-1
context-bank TLB invalidation so that:

	- Stage-1 mappings are marked non-global in the ptes
	- Each Stage-1 context-bank is assigned an ASID in TTBR0
	- VMID 0 is reserved for Stage-1 context-banks

This allows the hypervisor to overwrite the Stage-1 VMID in the CBAR
when trapping the write from the guest.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>
2013-08-14 12:09:42 +02:00
Will Deacon adaba32091 iommu/arm-smmu: Tighten up global fault reporting
On systems which use a single, combined irq line for the SMMU, context
faults may result in us spuriously reporting global faults with zero
status registers.

This patch fixes up the fsr checks in both the context and global fault
interrupt handlers, so that we only report the fault if the fsr
indicates something did indeed go awry.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>
2013-08-14 12:09:14 +02:00
Will Deacon 2ae9f2fa3f iommu/arm-smmu: Remove broken big-endian check
The bottom word of the pgd should always be written to the low half of
the TTBR, so we don't need to swap anything for big-endian.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>
2013-08-14 12:08:36 +02:00
Will Deacon 45ae7cff36 iommu/arm: Add support for ARM Ltd. System MMU architecture
This patch adds support for SMMUs implementing the ARM System MMU
architecture versions 1 or 2. Both arm and arm64 are supported, although
the v7s descriptor format is not used.

Cc: Rob Herring <robherring2@gmail.com>
Cc: Andreas Herrmann <andreas.herrmann@calxeda.com>
Cc: Olav Haugan <ohaugan@codeaurora.org>
Cc: Joerg Roedel <joro@8bytes.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Acked-by: Andreas Herrmann <andreas.herrmann@calxeda.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>
2013-06-25 23:34:20 +02:00