Commit Graph

1778 Commits

Author SHA1 Message Date
Christoph Hellwig fdd050b5b3 Merge branch 'uuid-types' of bombadil.infradead.org:public_git/uuid into nvme-base 2017-06-13 11:45:14 +02:00
Andy Shevchenko 94116f8126 ACPI: Switch to use generic guid_t in acpi_evaluate_dsm()
acpi_evaluate_dsm() and friends take a pointer to a raw buffer of 16
bytes. Instead we convert them to use guid_t type. At the same time we
convert current users.

acpi_str_to_uuid() becomes useless after the conversion and it's safe to
get rid of it.

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Cc: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Joerg Roedel <jroedel@suse.de>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Yisen Zhuang <yisen.zhuang@huawei.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Acked-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
2017-06-07 12:20:49 +02:00
Sricharan R a37b19a384 iommu/of: Ignore all errors except EPROBE_DEFER
While deferring the probe of IOMMU masters, xlate and
add_device callbacks called from of_iommu_configure
can pass back error values like -ENODEV, which means
the IOMMU cannot be connected with that master for real
reasons. Before the IOMMU probe deferral, all such errors
were ignored. Now all those errors are propagated back,
killing the master's probe for such errors. Instead ignore
all the errors except EPROBE_DEFER, which is the only one
of concern and let the master work without IOMMU, thus
restoring the old behavior. Also make explicit that
of_dma_configure handles only -EPROBE_DEFER from
of_iommu_configure.

Fixes: 7b07cbefb6 ("iommu: of: Handle IOMMU lookup failure with deferred probing or error")
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Magnus Damn <magnus.damn@gmail.com>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-05-30 11:31:32 +02:00
Sricharan R 573d41757c iommu/of: Fix check for returning EPROBE_DEFER
Now with IOMMU probe deferral, we return -EPROBE_DEFER
for masters that are connected to an IOMMU which is not
probed yet, but going to get probed, so that we can attach
the correct dma_ops. So while trying to defer the probe of
the master, check if the of_iommu node that it is connected
to is marked in DT as 'status=disabled', then the IOMMU is never
is going to get probed. So simply return NULL and let the master
work without an IOMMU.

Fixes: 7b07cbefb6 ("iommu: of: Handle IOMMU lookup failure with deferred probing or error")
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Will Deacon <will.deacon@arm.com>
Tested-by: Magnus Damn <magnus.damn@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-05-30 11:31:32 +02:00
Arnd Bergmann 745b6e7470 iommu/mediatek: Include linux/dma-mapping.h
The mediatek iommu driver relied on an implicit include of dma-mapping.h,
but for some reason that is no longer there in 4.12-rc1:

drivers/iommu/mtk_iommu_v1.c: In function 'mtk_iommu_domain_finalise':
drivers/iommu/mtk_iommu_v1.c:233:16: error: implicit declaration of function 'dma_zalloc_coherent'; did you mean 'debug_dma_alloc_coherent'? [-Werror=implicit-function-declaration]
drivers/iommu/mtk_iommu_v1.c: In function 'mtk_iommu_domain_free':
drivers/iommu/mtk_iommu_v1.c:265:2: error: implicit declaration of function 'dma_free_coherent'; did you mean 'debug_dma_free_coherent'? [-Werror=implicit-function-declaration]

This adds an explicit #include to make it build again.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 208480bb27 ('iommu: Remove trace-events include from iommu.h')
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-05-17 14:51:54 +02:00
KarimAllah Ahmed f73a7eee90 iommu/vt-d: Flush the IOTLB to get rid of the initial kdump mappings
Ever since commit 091d42e43d ("iommu/vt-d: Copy translation tables from
old kernel") the kdump kernel copies the IOMMU context tables from the
previous kernel. Each device mappings will be destroyed once the driver
for the respective device takes over.

This unfortunately breaks the workflow of mapping and unmapping a new
context to the IOMMU. The mapping function assumes that either:

1) Unmapping did the proper IOMMU flushing and it only ever flush if the
   IOMMU unit supports caching invalid entries.
2) The system just booted and the initialization code took care of
   flushing all IOMMU caches.

This assumption is not true for the kdump kernel since the context
tables have been copied from the previous kernel and translations could
have been cached ever since. So make sure to flush the IOTLB as well
when we destroy these old copied mappings.

Cc: Joerg Roedel <joro@8bytes.org>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Cc: Anthony Liguori <aliguori@amazon.com>
Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de>
Acked-by: David Woodhouse <dwmw@amazon.co.uk>
Cc: stable@vger.kernel.org  v4.2+
Fixes: 091d42e43d ("iommu/vt-d: Copy translation tables from old kernel")
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-05-17 14:44:47 +02:00
Robin Murphy 1cc896ed61 iommu/dma: Don't touch invalid iova_domain members
When __iommu_dma_map() and iommu_dma_free_iova() are called from
iommu_dma_get_msi_page(), various iova_*() helpers are still invoked in
the process, whcih is unwise since they access a different member of the
union (the iova_domain) from that which was last written, and there's no
guarantee that sensible values will result anyway.

CLean up the code paths that are valid for an MSI cookie to ensure we
only do iova_domain-specific things when we're actually dealing with one.

Fixes: a44e665758 ("iommu/dma: Clean up MSI IOVA allocation")
Reported-by: Nate Watterson <nwatters@codeaurora.org>
Tested-by: Shanker Donthineni <shankerd@codeaurora.org>
Tested-by: Bharat Bhushan <bharat.bhushan@nxp.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-05-17 14:35:29 +02:00
Linus Torvalds 28b47809b2 IOMMU Updates for Linux v4.12
This includes:
 
 	* Some code optimizations for the Intel VT-d driver
 
 	* Code to switch off a previously enabled Intel IOMMU
 
 	* Support for 'struct iommu_device' for OMAP, Rockchip and
 	  Mediatek IOMMUs
 
 	* Some header optimizations for IOMMU core code headers and a
 	  few fixes that became necessary in other parts of the kernel
 	  because of that
 
 	* ACPI/IORT updates and fixes
 
 	* Some Exynos IOMMU optimizations
 
 	* Code updates for the IOMMU dma-api code to bring it closer to
 	  use per-cpu iova caches
 
 	* New command-line option to set default domain type allocated
 	  by the iommu core code
 
 	* Another command line option to allow the Intel IOMMU switched
 	  off in a tboot environment
 
 	* ARM/SMMU: TLB sync optimisations for SMMUv2, Support for using
 	  an IDENTITY domain in conjunction with DMA ops, Support for
 	  SMR masking, Support for 16-bit ASIDs (was previously broken)
 
 	* Various other small fixes and improvements
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Merge tag 'iommu-updates-v4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull IOMMU updates from Joerg Roedel:

 - code optimizations for the Intel VT-d driver

 - ability to switch off a previously enabled Intel IOMMU

 - support for 'struct iommu_device' for OMAP, Rockchip and Mediatek
   IOMMUs

 - header optimizations for IOMMU core code headers and a few fixes that
   became necessary in other parts of the kernel because of that

 - ACPI/IORT updates and fixes

 - Exynos IOMMU optimizations

 - updates for the IOMMU dma-api code to bring it closer to use per-cpu
   iova caches

 - new command-line option to set default domain type allocated by the
   iommu core code

 - another command line option to allow the Intel IOMMU switched off in
   a tboot environment

 - ARM/SMMU: TLB sync optimisations for SMMUv2, Support for using an
   IDENTITY domain in conjunction with DMA ops, Support for SMR masking,
   Support for 16-bit ASIDs (was previously broken)

 - various other small fixes and improvements

* tag 'iommu-updates-v4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (63 commits)
  soc/qbman: Move dma-mapping.h include to qman_priv.h
  soc/qbman: Fix implicit header dependency now causing build fails
  iommu: Remove trace-events include from iommu.h
  iommu: Remove pci.h include from trace/events/iommu.h
  arm: dma-mapping: Don't override dma_ops in arch_setup_dma_ops()
  ACPI/IORT: Fix CONFIG_IOMMU_API dependency
  iommu/vt-d: Don't print the failure message when booting non-kdump kernel
  iommu: Move report_iommu_fault() to iommu.c
  iommu: Include device.h in iommu.h
  x86, iommu/vt-d: Add an option to disable Intel IOMMU force on
  iommu/arm-smmu: Return IOVA in iova_to_phys when SMMU is bypassed
  iommu/arm-smmu: Correct sid to mask
  iommu/amd: Fix incorrect error handling in amd_iommu_bind_pasid()
  iommu: Make iommu_bus_notifier return NOTIFY_DONE rather than error code
  omap3isp: Remove iommu_group related code
  iommu/omap: Add iommu-group support
  iommu/omap: Make use of 'struct iommu_device'
  iommu/omap: Store iommu_dev pointer in arch_data
  iommu/omap: Move data structures to omap-iommu.h
  iommu/omap: Drop legacy-style device support
  ...
2017-05-09 15:15:47 -07:00
Linus Torvalds 1062ae4982 extra pull request because I missed tegra.
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Merge tag 'drm-forgot-about-tegra-for-v4.12-rc1' of git://people.freedesktop.org/~airlied/linux

Pull drm tegra updates from Dave Airlie:
 "I missed a pull request from Thierry, this stuff has been in
  linux-next for a while anyways.

  It does contain a branch from the iommu tree, but Thierry said it
  should be fine"

* tag 'drm-forgot-about-tegra-for-v4.12-rc1' of git://people.freedesktop.org/~airlied/linux:
  gpu: host1x: Fix host1x driver shutdown
  gpu: host1x: Support module reset
  gpu: host1x: Sort includes alphabetically
  drm/tegra: Add VIC support
  dt-bindings: Add bindings for the Tegra VIC
  drm/tegra: Add falcon helper library
  drm/tegra: Add Tegra DRM allocation API
  drm/tegra: Add tiling FB modifiers
  drm/tegra: Don't leak kernel pointer to userspace
  drm/tegra: Protect IOMMU operations by mutex
  drm/tegra: Enable IOVA API when IOMMU support is enabled
  gpu: host1x: Add IOMMU support
  gpu: host1x: Fix potential out-of-bounds access
  iommu/iova: Fix compile error with CONFIG_IOMMU_IOVA=m
  iommu: Add dummy implementations for !IOMMU_IOVA
  MAINTAINERS: Add related headers to IOMMU section
  iommu/iova: Consolidate code for adding new node to iovad domain rbtree
2017-05-05 17:18:44 -07:00
Dave Airlie 644b4930bf drm/tegra: Changes for v4.12-rc1
This contains various fixes to the host1x driver as well as a plug for a
 leak of kernel pointers to userspace.
 
 A fairly big addition this time around is the Video Image Composer (VIC)
 support that can be used to accelerate some 2D and image compositing
 operations.
 
 Furthermore the driver now supports FB modifiers, so we no longer rely
 on a custom IOCTL to set those.
 
 Finally this contains a few preparatory patches for Tegra186 support
 which unfortunately didn't quite make it this time, but will hopefully
 be ready for v4.13.
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Merge tag 'drm/tegra/for-4.12-rc1' of git://anongit.freedesktop.org/tegra/linux into drm-next

drm/tegra: Changes for v4.12-rc1

This contains various fixes to the host1x driver as well as a plug for a
leak of kernel pointers to userspace.

A fairly big addition this time around is the Video Image Composer (VIC)
support that can be used to accelerate some 2D and image compositing
operations.

Furthermore the driver now supports FB modifiers, so we no longer rely
on a custom IOCTL to set those.

Finally this contains a few preparatory patches for Tegra186 support
which unfortunately didn't quite make it this time, but will hopefully
be ready for v4.13.

* tag 'drm/tegra/for-4.12-rc1' of git://anongit.freedesktop.org/tegra/linux:
  gpu: host1x: Fix host1x driver shutdown
  gpu: host1x: Support module reset
  gpu: host1x: Sort includes alphabetically
  drm/tegra: Add VIC support
  dt-bindings: Add bindings for the Tegra VIC
  drm/tegra: Add falcon helper library
  drm/tegra: Add Tegra DRM allocation API
  drm/tegra: Add tiling FB modifiers
  drm/tegra: Don't leak kernel pointer to userspace
  drm/tegra: Protect IOMMU operations by mutex
  drm/tegra: Enable IOVA API when IOMMU support is enabled
  gpu: host1x: Add IOMMU support
  gpu: host1x: Fix potential out-of-bounds access
  iommu/iova: Fix compile error with CONFIG_IOMMU_IOVA=m
  iommu: Add dummy implementations for !IOMMU_IOVA
  MAINTAINERS: Add related headers to IOMMU section
  iommu/iova: Consolidate code for adding new node to iovad domain rbtree
2017-05-05 11:47:01 +10:00
Joerg Roedel 2c0248d688 Merge branches 'arm/exynos', 'arm/omap', 'arm/rockchip', 'arm/mediatek', 'arm/smmu', 'arm/core', 'x86/vt-d', 'x86/amd' and 'core' into next 2017-05-04 18:06:17 +02:00
Linus Torvalds b68e7e952f Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 updates from Martin Schwidefsky:

 - three merges for KVM/s390 with changes for vfio-ccw and cpacf. The
   patches are included in the KVM tree as well, let git sort it out.

 - add the new 'trng' random number generator

 - provide the secure key verification API for the pkey interface

 - introduce the z13 cpu counters to perf

 - add a new system call to set up the guarded storage facility

 - simplify TASK_SIZE and arch_get_unmapped_area

 - export the raw STSI data related to CPU topology to user space

 - ... and the usual churn of bug-fixes and cleanups.

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (74 commits)
  s390/crypt: use the correct module alias for paes_s390.
  s390/cpacf: Introduce kma instruction
  s390/cpacf: query instructions use unique parameters for compatibility with KMA
  s390/trng: Introduce s390 TRNG device driver.
  s390/crypto: Provide s390 specific arch random functionality.
  s390/crypto: Add new subfunctions to the cpacf PRNO function.
  s390/crypto: Renaming PPNO to PRNO.
  s390/pageattr: avoid unnecessary page table splitting
  s390/mm: simplify arch_get_unmapped_area[_topdown]
  s390/mm: make TASK_SIZE independent from the number of page table levels
  s390/gs: add regset for the guarded storage broadcast control block
  s390/kvm: Add use_cmma field to mm_context_t
  s390/kvm: Add PGSTE manipulation functions
  vfio: ccw: improve error handling for vfio_ccw_mdev_remove
  vfio: ccw: remove unnecessary NULL checks of a pointer
  s390/spinlock: remove compare and delay instruction
  s390/spinlock: use atomic primitives for spinlocks
  s390/cpumf: simplify detection of guest samples
  s390/pci: remove forward declaration
  s390/pci: increase the PCI_NR_FUNCTIONS default
  ...
2017-05-02 09:50:09 -07:00
Joerg Roedel 461a6946b1 iommu: Remove pci.h include from trace/events/iommu.h
The include file does not need any PCI specifics, so remove
that include. Also fix the places that relied on it.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-29 00:20:49 +02:00
Qiuxu Zhuo 8e12188400 iommu/vt-d: Don't print the failure message when booting non-kdump kernel
When booting a new non-kdump kernel, we have below failure message:

[    0.004000] DMAR-IR: IRQ remapping was enabled on dmar2 but we are not in kdump mode
[    0.004000] DMAR-IR: Failed to copy IR table for dmar2 from previous kernel
[    0.004000] DMAR-IR: IRQ remapping was enabled on dmar1 but we are not in kdump mode
[    0.004000] DMAR-IR: Failed to copy IR table for dmar1 from previous kernel
[    0.004000] DMAR-IR: IRQ remapping was enabled on dmar0 but we are not in kdump mode
[    0.004000] DMAR-IR: Failed to copy IR table for dmar0 from previous kernel
[    0.004000] DMAR-IR: IRQ remapping was enabled on dmar3 but we are not in kdump mode
[    0.004000] DMAR-IR: Failed to copy IR table for dmar3 from previous kernel

For non-kdump case, we no need to copy IR table from previous kernel
so it's nonthing actually failed. To be less alarming or misleading,
do not print "DMAR-IR: Failed to copy IR table for dmar[0-9] from
previous kernel" messages when booting non-kdump kernel.

Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-28 23:38:42 +02:00
Joerg Roedel 207c6e36f1 iommu: Move report_iommu_fault() to iommu.c
The function is in no fast-path, there is no need for it to
be static inline in a header file. This also removes the
need to include iommu trace-points in iommu.h.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-27 11:24:11 +02:00
Shaohua Li bfd20f1cc8 x86, iommu/vt-d: Add an option to disable Intel IOMMU force on
IOMMU harms performance signficantly when we run very fast networking
workloads. It's 40GB networking doing XDP test. Software overhead is
almost unaware, but it's the IOTLB miss (based on our analysis) which
kills the performance. We observed the same performance issue even with
software passthrough (identity mapping), only the hardware passthrough
survives. The pps with iommu (with software passthrough) is only about
~30% of that without it. This is a limitation in hardware based on our
observation, so we'd like to disable the IOMMU force on, but we do want
to use TBOOT and we can sacrifice the DMA security bought by IOMMU. I
must admit I know nothing about TBOOT, but TBOOT guys (cc-ed) think not
eabling IOMMU is totally ok.

So introduce a new boot option to disable the force on. It's kind of
silly we need to run into intel_iommu_init even without force on, but we
need to disable TBOOT PMR registers. For system without the boot option,
nothing is changed.

Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-26 23:57:53 +02:00
Sunil Goutham bdf9592308 iommu/arm-smmu: Return IOVA in iova_to_phys when SMMU is bypassed
For software initiated address translation, when domain type is
IOMMU_DOMAIN_IDENTITY i.e SMMU is bypassed, mimic HW behavior
i.e return the same IOVA as translated address.

This patch is an extension to Will Deacon's patchset
"Implement SMMU passthrough using the default domain".

Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-26 12:30:10 +02:00
Peng Fan 6323f47490 iommu/arm-smmu: Correct sid to mask
From code "SMR mask 0x%x out of range for SMMU", so, we need to use mask, not
sid.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-25 14:26:05 +02:00
Pan Bian 73dbd4a423 iommu/amd: Fix incorrect error handling in amd_iommu_bind_pasid()
In function amd_iommu_bind_pasid(), the control flow jumps
to label out_free when pasid_state->mm and mm is NULL. And
mmput(mm) is called.  In function mmput(mm), mm is
referenced without validation. This will result in a NULL
dereference bug. This patch fixes the bug.

Signed-off-by: Pan Bian <bianpan2016@163.com>
Fixes: f0aac63b87 ('iommu/amd: Don't hold a reference to mm_struct')
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-24 12:33:34 +02:00
zhichang.yuan 3ba8775f64 iommu: Make iommu_bus_notifier return NOTIFY_DONE rather than error code
In iommu_bus_notifier(), when action is
BUS_NOTIFY_ADD_DEVICE, it will return 'ops->add_device(dev)'
directly. But ops->add_device will return ERR_VAL, such as
-ENODEV. These value will make notifier_call_chain() not to
traverse the remain nodes in struct notifier_block list.

This patch revises iommu_bus_notifier() to return
NOTIFY_DONE when some errors happened in ops->add_device().

Signed-off-by: zhichang.yuan <yuanzhichang@hisilicon.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-20 16:42:52 +02:00
Joerg Roedel 28ae1e3e14 iommu/omap: Add iommu-group support
Support for IOMMU groups will become mandatory for drivers,
so add it to the omap iommu driver.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
[s-anna@ti.com: minor error cleanups]
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-20 16:33:59 +02:00
Joerg Roedel 01611fe847 iommu/omap: Make use of 'struct iommu_device'
Modify the driver to register individual iommus and
establish links between devices and iommus in sysfs.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
[s-anna@ti.com: fix some cleanup issues during failures]
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-20 16:33:58 +02:00
Joerg Roedel ede1c2e7d4 iommu/omap: Store iommu_dev pointer in arch_data
Instead of finding the matching IOMMU for a device using
string comparision functions, store the pointer to the
iommu_dev in arch_data during the omap_iommu_add_device
callback and reset it during the omap_iommu_remove_device
callback functions.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
[s-anna@ti.com: few minor cleanups]
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-20 16:33:58 +02:00
Joerg Roedel e73b7afe4e iommu/omap: Move data structures to omap-iommu.h
The internal data-structures are scattered over various
header and C files. Consolidate them in omap-iommu.h.

While at this, add the kerneldoc comment for the missing
iommu domain variable and revise the iommu_arch_data name.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
[s-anna@ti.com: revise kerneldoc comments]
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-20 16:33:58 +02:00
Suman Anna 49a57ef7f8 iommu/omap: Drop legacy-style device support
All the supported boards that have OMAP IOMMU devices do support
DT boot only now. So, drop the support for the non-DT legacy-style
devices from the OMAP IOMMU driver. Couple of the fields from the
iommu platform data would no longer be required, so they have also
been cleaned up. The IOMMU platform data is still needed though for
performing reset management properly in a multi-arch environment.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-20 16:33:58 +02:00
Suman Anna abaa7e5b05 iommu/omap: Register driver before setting IOMMU ops
Move the registration of the OMAP IOMMU platform driver before
setting the IOMMU callbacks on the platform bus. This causes
the IOMMU devices to be probed first before the .add_device()
callback is invoked for all registered devices, and allows
the iommu_group support to be added to the OMAP IOMMU driver.

While at this, also check for the return status from bus_set_iommu.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-20 16:33:58 +02:00
Robin Murphy f6810c15cf iommu/arm-smmu: Clean up early-probing workarounds
Now that the appropriate ordering is enforced via probe-deferral of
masters in core code, rip it all out and bask in the simplicity.

Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
[Sricharan: Rebased on top of ACPI IORT SMMU series]
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-20 16:31:09 +02:00
Laurent Pinchart 7b07cbefb6 iommu: of: Handle IOMMU lookup failure with deferred probing or error
Failures to look up an IOMMU when parsing the DT iommus property need to
be handled separately from the .of_xlate() failures to support deferred
probing.

The lack of a registered IOMMU can be caused by the lack of a driver for
the IOMMU, the IOMMU device probe not having been performed yet, having
been deferred, or having failed.

The first case occurs when the device tree describes the bus master and
IOMMU topology correctly but no device driver exists for the IOMMU yet
or the device driver has not been compiled in. Return NULL, the caller
will configure the device without an IOMMU.

The second and third cases are handled by deferring the probe of the bus
master device which will eventually get reprobed after the IOMMU.

The last case is currently handled by deferring the probe of the bus
master device as well. A mechanism to either configure the bus master
device without an IOMMU or to fail the bus master device probe depending
on whether the IOMMU is optional or mandatory would be a good
enhancement.

Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Laurent Pichart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-20 16:31:07 +02:00
Robin Murphy d7b0558230 iommu/of: Prepare for deferred IOMMU configuration
IOMMU configuration represents unchanging properties of the hardware,
and as such should only need happen once in a device's lifetime, but
the necessary interaction with the IOMMU device and driver complicates
exactly when that point should be.

Since the only reasonable tool available for handling the inter-device
dependency is probe deferral, we need to prepare of_iommu_configure()
to run later than it is currently called (i.e. at driver probe rather
than device creation), to handle being retried, and to tell whether a
not-yet present IOMMU should be waited for or skipped (by virtue of
having declared a built-in driver or not).

Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-20 16:31:06 +02:00
Robin Murphy 2a0c57545a iommu/of: Refactor of_iommu_configure() for error handling
In preparation for some upcoming cleverness, rework the control flow in
of_iommu_configure() to minimise duplication and improve the propogation
of errors. It's also as good a time as any to switch over from the
now-just-a-compatibility-wrapper of_iommu_get_ops() to using the generic
IOMMU instance interface directly.

Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-20 16:31:05 +02:00
Nate Watterson 5016bdb796 iommu/iova: Fix underflow bug in __alloc_and_insert_iova_range
Normally, calling alloc_iova() using an iova_domain with insufficient
pfns remaining between start_pfn and dma_limit will fail and return a
NULL pointer. Unexpectedly, if such a "full" iova_domain contains an
iova with pfn_lo == 0, the alloc_iova() call will instead succeed and
return an iova containing invalid pfns.

This is caused by an underflow bug in __alloc_and_insert_iova_range()
that occurs after walking the "full" iova tree when the search ends
at the iova with pfn_lo == 0 and limit_pfn is then adjusted to be just
below that (-1). This (now huge) limit_pfn gives the impression that a
vast amount of space is available between it and start_pfn and thus
a new iova is allocated with the invalid pfn_hi value, 0xFFF.... .

To rememdy this, a check is introduced to ensure that adjustments to
limit_pfn will not underflow.

This issue has been observed in the wild, and is easily reproduced with
the following sample code.

	struct iova_domain *iovad = kzalloc(sizeof(*iovad), GFP_KERNEL);
	struct iova *rsvd_iova, *good_iova, *bad_iova;
	unsigned long limit_pfn = 3;
	unsigned long start_pfn = 1;
	unsigned long va_size = 2;

	init_iova_domain(iovad, SZ_4K, start_pfn, limit_pfn);
	rsvd_iova = reserve_iova(iovad, 0, 0);
	good_iova = alloc_iova(iovad, va_size, limit_pfn, true);
	bad_iova = alloc_iova(iovad, va_size, limit_pfn, true);

Prior to the patch, this yielded:
	*rsvd_iova == {0, 0}   /* Expected */
	*good_iova == {2, 3}   /* Expected */
	*bad_iova  == {-2, -1} /* Oh no... */

After the patch, bad_iova is NULL as expected since inadequate
space remains between limit_pfn and start_pfn after allocating
good_iova.

Signed-off-by: Nate Watterson <nwatters@codeaurora.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-07 13:40:40 +02:00
Robin Murphy 022f4e4f31 iommu/io-pgtable-arm: Avoid shift overflow in block size
The recursive nature of __arm_lpae_{map,unmap}() means that
ARM_LPAE_BLOCK_SIZE() is evaluated for every level, including those
where block mappings aren't possible. This in itself is harmless enough,
as we will only ever be called with valid sizes from the pgsize_bitmap,
and thus always recurse down past any imaginary block sizes. The only
problem is that most of those imaginary sizes overflow the type used for
the calculation, and thus trigger warnings under UBsan:

[   63.020939] ================================================================================
[   63.021284] UBSAN: Undefined behaviour in drivers/iommu/io-pgtable-arm.c:312:22
[   63.021602] shift exponent 39 is too large for 32-bit type 'int'
[   63.021909] CPU: 0 PID: 1119 Comm: lkvm Not tainted 4.7.0-rc3+ #819
[   63.022163] Hardware name: FVP Base (DT)
[   63.022345] Call trace:
[   63.022629] [<ffffff900808f258>] dump_backtrace+0x0/0x3a8
[   63.022975] [<ffffff900808f614>] show_stack+0x14/0x20
[   63.023294] [<ffffff90086bc9dc>] dump_stack+0x104/0x148
[   63.023609] [<ffffff9008713ce8>] ubsan_epilogue+0x18/0x68
[   63.023956] [<ffffff9008714410>] __ubsan_handle_shift_out_of_bounds+0x18c/0x1bc
[   63.024365] [<ffffff900890fcb0>] __arm_lpae_map+0x720/0xae0
[   63.024732] [<ffffff9008910170>] arm_lpae_map+0x100/0x190
[   63.025049] [<ffffff90089183d8>] arm_smmu_map+0x78/0xc8
[   63.025390] [<ffffff9008906c18>] iommu_map+0x130/0x230
[   63.025763] [<ffffff9008bf7564>] vfio_iommu_type1_attach_group+0x4bc/0xa00
[   63.026156] [<ffffff9008bf3c78>] vfio_fops_unl_ioctl+0x320/0x580
[   63.026515] [<ffffff9008377420>] do_vfs_ioctl+0x140/0xd28
[   63.026858] [<ffffff9008378094>] SyS_ioctl+0x8c/0xa0
[   63.027179] [<ffffff9008086e70>] el0_svc_naked+0x24/0x28
[   63.027412] ================================================================================

Perform the shift in a 64-bit type to prevent the theoretical overflow
and keep the peace. As it turns out, this generates identical code for
32-bit ARM, and marginally shorter AArch64 code, so it's good all round.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-04-06 16:06:44 +01:00
Will Deacon fccb4e3b8a iommu: Allow default domain type to be set on the kernel command line
The IOMMU core currently initialises the default domain for each group
to IOMMU_DOMAIN_DMA, under the assumption that devices will use
IOMMU-backed DMA ops by default. However, in some cases it is desirable
for the DMA ops to bypass the IOMMU for performance reasons, reserving
use of translation for subsystems such as VFIO that require it for
enforcing device isolation.

Rather than modify each IOMMU driver to provide different semantics for
DMA domains, instead we introduce a command line parameter that can be
used to change the type of the default domain. Passthrough can then be
specified using "iommu.passthrough=1" on the kernel command line.

Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-04-06 16:06:44 +01:00
Will Deacon beb3c6a066 iommu/arm-smmu-v3: Install bypass STEs for IOMMU_DOMAIN_IDENTITY domains
In preparation for allowing the default domain type to be overridden,
this patch adds support for IOMMU_DOMAIN_IDENTITY domains to the
ARM SMMUv3 driver.

An identity domain is created by placing the corresponding stream table
entries into "bypass" mode, which allows transactions to flow through
the SMMU without any translation.

Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-04-06 16:06:43 +01:00
Will Deacon 67560edcd8 iommu/arm-smmu-v3: Make arm_smmu_install_ste_for_dev return void
arm_smmu_install_ste_for_dev cannot fail and always returns 0, however
the fact that it returns int means that callers end up implementing
redundant error handling code which complicates STE tracking and is
never executed.

This patch changes the return type of arm_smmu_install_ste_for_dev
to void, to make it explicit that it cannot fail.

Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-04-06 16:06:43 +01:00
Will Deacon 61bc671179 iommu/arm-smmu: Install bypass S2CRs for IOMMU_DOMAIN_IDENTITY domains
In preparation for allowing the default domain type to be overridden,
this patch adds support for IOMMU_DOMAIN_IDENTITY domains to the
ARM SMMU driver.

An identity domain is created by placing the corresponding S2CR
registers into "bypass" mode, which allows transactions to flow through
the SMMU without any translation.

Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-04-06 16:06:43 +01:00
Will Deacon 0834cc28fa iommu/arm-smmu: Restrict domain attributes to UNMANAGED domains
The ARM SMMU drivers provide a DOMAIN_ATTR_NESTING domain attribute,
which allows callers of the IOMMU API to request that the page table
for a domain is installed at stage-2, if supported by the hardware.

Since setting this attribute only makes sense for UNMANAGED domains,
this patch returns -ENODEV if the domain_{get,set}_attr operations are
called on other domain types.

Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-04-06 16:06:43 +01:00
Robin Murphy 56fbf600dd iommu/arm-smmu: Add global SMR masking property
The current SMR masking support using a 2-cell iommu-specifier is
primarily intended to handle individual masters with large and/or
complex Stream ID assignments; it quickly gets a bit clunky in other SMR
use-cases where we just want to consistently mask out the same part of
every Stream ID (e.g. for MMU-500 configurations where the appended TBU
number gets in the way unnecessarily). Let's add a new property to allow
a single global mask value to better fit the latter situation.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Nipun Gupta <nipun.gupta@nxp.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-04-06 16:06:43 +01:00
Robin Murphy 8513c89300 iommu/arm-smmu: Poll for TLB sync completion more effectively
On relatively slow development platforms and software models, the
inefficiency of our TLB sync loop tends not to show up - for instance on
a Juno r1 board I typically see the TLBI has completed of its own accord
by the time we get to the sync, such that the latter finishes instantly.

However, on larger systems doing real I/O, it's less realistic for the
TLBs to go idle immediately, and at that point falling into the 1MHz
polling loop turns out to throw away performance drastically. Let's
strike a balance by polling more than once between pauses, such that we
have much more chance of catching normal operations completing before
committing to the fixed delay, but also backing off exponentially, since
if a sync really hasn't completed within one or two "reasonable time"
periods, it becomes increasingly unlikely that it ever will.

Reviewed-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-04-06 16:06:43 +01:00
Robin Murphy 11febfca24 iommu/arm-smmu: Use per-context TLB sync as appropriate
TLB synchronisation typically involves the SMMU blocking all incoming
transactions until the TLBs report completion of all outstanding
operations. In the common SMMUv2 configuration of a single distributed
SMMU serving multiple peripherals, that means that a single unmap
request has the potential to bring the hammer down on the entire system
if synchronised globally. Since stage 1 contexts, and stage 2 contexts
under SMMUv2, offer local sync operations, let's make use of those
wherever we can in the hope of minimising global disruption.

To that end, rather than add any more branches to the already unwieldy
monolithic TLB maintenance ops, break them up into smaller, neater,
functions which we can then mix and match as appropriate.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-04-06 16:06:43 +01:00
Robin Murphy 452107c790 iommu/arm-smmu: Tidy up context bank indexing
ARM_AMMU_CB() is calculated relative to ARM_SMMU_CB_BASE(), but the
latter is never of use on its own, and what we end up with is the same
ARM_SMMU_CB_BASE() + ARM_AMMU_CB() expression being duplicated at every
callsite. Folding the two together gives us a self-contained context
bank accessor which is much more pleasant to work with.

Secondly, we might as well simplify CB_BASE itself at the same time.
We use the address space size for its own sake precisely once, at probe
time, and every other usage is to dynamically calculate CB_BASE over
and over and over again. Let's flip things around so that we just
maintain the CB_BASE address directly.

Reviewed-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-04-06 16:06:43 +01:00
Robin Murphy 280b683cea iommu/arm-smmu: Simplify ASID/VMID handling
Calculating ASIDs/VMIDs dynamically from arm_smmu_cfg was a neat trick,
but the global uniqueness workaround makes it somewhat more awkward, and
means we end up having to pass extra state around in certain cases just
to keep a handle on the offset.

We already have 16 bits going spare in arm_smmu_cfg; let's just
precalculate an ASID/VMID, plop it in there, and tidy up the users
accordingly. We'd also need something like this anyway if we ever get
near to thinking about SVM, so it's no bad thing.

Reviewed-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-04-06 16:06:42 +01:00
Sunil Goutham 125458ab3a iommu/arm-smmu: Fix 16-bit ASID configuration
16-bit ASID should be enabled before initializing TTBR0/1,
otherwise only LSB 8-bit ASID will be considered. Hence
moving configuration of TTBCR register ahead of TTBR0/1
while initializing context bank.

Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
[will: rewrote comment]
Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-04-06 16:06:42 +01:00
Robert Richter 53c35dce45 iommu/arm-smmu: Print message when Cavium erratum 27704 was detected
Firmware is responsible for properly enabling smmu workarounds. Print
a message for better diagnostics when Cavium erratum 27704 was
detected.

Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Robert Richter <rrichter@cavium.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-04-06 16:06:42 +01:00
Joerg Roedel 6f66ea099f iommu/mediatek: Teach MTK-IOMMUv1 about 'struct iommu_device'
Make use of the iommu_device_register() interface.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-03 13:17:02 +02:00
Joerg Roedel c9d9f2394c iommu/rockchip: Make use of 'struct iommu_device'
Register hardware IOMMUs seperatly with the iommu-core code
and add a sysfs representation of the iommu topology.

Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-03 13:15:35 +02:00
Robin Murphy bb65a64c72 iommu/dma: Plumb in the per-CPU IOVA caches
With IOVA allocation suitably tidied up, we are finally free to opt in
to the per-CPU caching mechanism. The caching alone can provide a modest
improvement over walking the rbtree for weedier systems (iperf3 shows
~10% more ethernet throughput on an ARM Juno r1 constrained to a single
650MHz Cortex-A53), but the real gain will be in sidestepping the rbtree
lock contention which larger ARM-based systems with lots of parallel I/O
are starting to feel the pain of.

Reviewed-by: Nate Watterson <nwatters@codeaurora.org>
Tested-by: Nate Watterson <nwatters@codeaurora.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-03 12:45:03 +02:00
Robin Murphy a44e665758 iommu/dma: Clean up MSI IOVA allocation
Now that allocation is suitably abstracted, our private alloc/free
helpers can drive the trivial MSI cookie allocator directly as well,
which lets us clean up its exposed guts from iommu_dma_map_msi_msg() and
simplify things quite a bit.

Reviewed-by: Nate Watterson <nwatters@codeaurora.org>
Tested-by: Nate Watterson <nwatters@codeaurora.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-03 12:45:03 +02:00
Robin Murphy 842fe519f6 iommu/dma: Convert to address-based allocation
In preparation for some IOVA allocation improvements, clean up all the
explicit struct iova usage such that all our mapping, unmapping and
cleanup paths deal exclusively with addresses rather than implementation
details. In the process, a few of the things we're touching get renamed
for the sake of internal consistency.

Reviewed-by: Nate Watterson <nwatters@codeaurora.org>
Tested-by: Nate Watterson <nwatters@codeaurora.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-04-03 12:45:02 +02:00
Dong Jia Shi 63f1934d56 vfio: ccw: basic implementation for vfio_ccw driver
To make vfio support subchannel devices, we need a css driver for
the vfio subchannels. This patch adds a basic vfio-ccw subchannel
driver for this purpose.

To enable VFIO for vfio-ccw, enable S390_CCW_IOMMU config option
and configure VFIO as required.

Acked-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Message-Id: <20170317031743.40128-5-bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2017-03-31 12:55:04 +02:00