Commit Graph

126 Commits

Author SHA1 Message Date
Joerg Roedel 72dcac6334 iommu: Warn once when device_group callback returns NULL
This callback should never return NULL. Print a warning if
that happens so that we notice and can fix it.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-06-28 13:29:46 +02:00
Joerg Roedel 7f7a2304aa iommu: Return ERR_PTR() values from device_group call-backs
The generic device_group call-backs in iommu.c return NULL
in case of error. Since they are getting ERR_PTR values from
iommu_group_alloc(), just pass them up instead.

Reported-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-06-28 13:29:45 +02:00
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
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
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
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
Robin Murphy 9d3a4de4cb iommu: Disambiguate MSI region types
The introduction of reserved regions has left a couple of rough edges
which we could do with sorting out sooner rather than later. Since we
are not yet addressing the potential dynamic aspect of software-managed
reservations and presenting them at arbitrary fixed addresses, it is
incongruous that we end up displaying hardware vs. software-managed MSI
regions to userspace differently, especially since ARM-based systems may
actually require one or the other, or even potentially both at once,
(which iommu-dma currently has no hope of dealing with at all). Let's
resolve the former user-visible inconsistency ASAP before the ABI has
been baked into a kernel release, in a way that also lays the groundwork
for the latter shortcoming to be addressed by follow-up patches.

For clarity, rename the software-managed type to IOMMU_RESV_SW_MSI, use
IOMMU_RESV_MSI to describe the hardware type, and document everything a
little bit. Since the x86 MSI remapping hardware falls squarely under
this meaning of IOMMU_RESV_MSI, apply that type to their regions as well,
so that we tell the same story to userspace across all platforms.

Secondly, as the various region types require quite different handling,
and it really makes little sense to ever try combining them, convert the
bitfield-esque #defines to a plain enum in the process before anyone
gets the wrong impression.

Fixes: d30ddcaa7b ("iommu: Add a new type field in iommu_resv_region")
Reviewed-by: Eric Auger <eric.auger@redhat.com>
CC: Alex Williamson <alex.williamson@redhat.com>
CC: David Woodhouse <dwmw2@infradead.org>
CC: kvm@vger.kernel.org
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-03-22 16:16:17 +01:00
Joerg Roedel 8d2932dd06 Merge branches 'iommu/fixes', 'arm/exynos', 'arm/renesas', 'arm/smmu', 'arm/mediatek', 'arm/core', 'x86/vt-d' and 'core' into next 2017-02-10 15:13:10 +01:00
Joerg Roedel d0f6f58326 iommu: Remove iommu_register_instance interface
And also move its remaining functionality to
iommu_device_register() and 'struct iommu_device'.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: devicetree@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-02-10 14:54:37 +01:00
Joerg Roedel b0119e8708 iommu: Introduce new 'struct iommu_device'
This struct represents one hardware iommu in the iommu core
code. For now it only has the iommu-ops associated with it,
but that will be extended soon.

The register/unregister interface is also added, as well as
making use of it in the Intel and AMD IOMMU drivers.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-02-10 13:44:57 +01:00
Joerg Roedel c09e22d537 iommu: Rename struct iommu_device
The struct is used to link devices to iommu-groups, so
'struct group_device' is a better name. Further this makes
the name iommu_device available for a struct representing
hardware iommus.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-02-10 13:44:57 +01:00
Joerg Roedel 534766dfef iommu: Rename iommu_get_instance()
Rename the function to iommu_ops_from_fwnode(), because that
is what the function actually does. The new name is much
more descriptive about what the function does.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-02-10 13:44:57 +01:00
Eric Auger a514a6e241 iommu: Fix static checker warning in iommu_insert_device_resv_regions
In case the device reserved region list is void, the returned value
of iommu_insert_device_resv_regions is uninitialized. Let's return 0
in that case.

This fixes commit 6c65fb318e ("iommu: iommu_get_group_resv_regions").

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-02-06 14:08:53 +01:00
Zhen Lei 909111ba0b iommu: Avoid unnecessary assignment of dev->iommu_fwspec
Move the assignment statement into if branch above, where it only
needs to be.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-02-06 14:06:42 +01:00
Eric Auger bc7d12b91b iommu: Implement reserved_regions iommu-group sysfs file
A new iommu-group sysfs attribute file is introduced. It contains
the list of reserved regions for the iommu-group. Each reserved
region is described on a separate line:
- first field is the start IOVA address,
- second is the end IOVA address,
- third is the type.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com>
Tested-by: Bharat Bhushan <bharat.bhushan@nxp.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-01-23 11:48:16 +00:00
Eric Auger 6c65fb318e iommu: iommu_get_group_resv_regions
Introduce iommu_get_group_resv_regions whose role consists in
enumerating all devices from the group and collecting their
reserved regions. The list is sorted and overlaps between
regions of the same type are handled by merging the regions.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com>
Tested-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com>
Tested-by: Bharat Bhushan <bharat.bhushan@nxp.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-01-23 11:48:16 +00:00
Eric Auger 544a25d904 iommu: Only map direct mapped regions
As we introduced new reserved region types which do not require
mapping, let's make sure we only map direct mapped regions.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com>
Tested-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com>
Tested-by: Bharat Bhushan <bharat.bhushan@nxp.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-01-23 11:48:16 +00:00
Eric Auger 2b20cbba33 iommu: iommu_alloc_resv_region
Introduce a new helper serving the purpose to allocate a reserved
region. This will be used in iommu driver implementing reserved
region callbacks.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com>
Tested-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com>
Tested-by: Bharat Bhushan <bharat.bhushan@nxp.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-01-23 11:48:16 +00:00
Eric Auger e5b5234a36 iommu: Rename iommu_dm_regions into iommu_resv_regions
We want to extend the callbacks used for dm regions and
use them for reserved regions. Reserved regions can be
- directly mapped regions
- regions that cannot be iommu mapped (PCI host bridge windows, ...)
- MSI regions (because they belong to another address space or because
  they are not translated by the IOMMU and need special handling)

So let's rename the struct and also the callbacks.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com>
Tested-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com>
Tested-by: Bharat Bhushan <bharat.bhushan@nxp.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-01-23 11:48:16 +00:00
Robin Murphy 797a8b4d76 iommu: Handle default domain attach failure
We wouldn't normally expect ops->attach_dev() to fail, but on IOMMUs
with limited hardware resources, or generally misconfigured systems,
it is certainly possible. We report failure correctly from the external
iommu_attach_device() interface, but do not do so in iommu_group_add()
when attaching to the default domain. The result of failure there is
that the device, group and domain all get left in a broken,
part-configured state which leads to weird errors and misbehaviour down
the line when IOMMU API calls sort-of-but-don't-quite work.

Check the return value of __iommu_attach_device() on the default domain,
and refactor the error handling paths to cope with its failure and clean
up correctly in such cases.

Fixes: e39cb8a3aa ("iommu: Make sure a device is always attached to a domain")
Reported-by: Punit Agrawal <punit.agrawal@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2017-01-17 16:49:24 +01:00
Joerg Roedel 1465f48146 Merge branches 'arm/mediatek', 'arm/smmu', 'x86/amd', 's390', 'core' and 'arm/exynos' into next 2016-12-06 17:32:16 +01:00
Lorenzo Pieralisi e4f10ffe4c iommu: Make of_iommu_set/get_ops() DT agnostic
The of_iommu_{set/get}_ops() API is used to associate a device
tree node with a specific set of IOMMU operations. The same
kernel interface is required on systems booting with ACPI, where
devices are not associated with a device tree node, therefore
the interface requires generalization.

The struct device fwnode member represents the fwnode token associated
with the device and the struct it points at is firmware specific;
regardless, it is initialized on both ACPI and DT systems and makes an
ideal candidate to use it to associate a set of IOMMU operations to a
given device, through its struct device.fwnode member pointer, paving
the way for representing per-device iommu_ops (ie an iommu instance
associated with a device).

Convert the DT specific of_iommu_{set/get}_ops() interface to
use struct device.fwnode as a look-up token, making the interface
usable on ACPI systems and rename the data structures and the
registration API so that they are made to represent their usage
more clearly.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Tomasz Nowicki <tn@semihalf.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Tomasz Nowicki <tn@semihalf.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Hanjun Guo <hanjun.guo@linaro.org>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Joerg Roedel <joro@8bytes.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-11-29 15:57:43 +00:00
Robin Murphy 13f59a78c6 iommu: Allow taking a reference on a group directly
iommu_group_get_for_dev() expects that the IOMMU driver's device_group
callback return a group with a reference held for the given device.
Whilst allocating a new group is fine, and pci_device_group() correctly
handles reusing an existing group, there is no general means for IOMMU
drivers doing their own group lookup to take additional references on an
existing group pointer without having to also store device pointers or
resort to elaborate trickery.

Add an IOMMU-driver-specific function to fill the hole.

Acked-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2016-11-15 12:25:33 +01:00
Robin Murphy 57f98d2f61 iommu: Introduce iommu_fwspec
Introduce a common structure to hold the per-device firmware data that
most IOMMU drivers need to keep track of. This enables us to configure
much of that data from common firmware code, and consolidate a lot of
the equivalent implementations, device look-up tables, etc. which are
currently strewn across IOMMU drivers.

This will also be enable us to address the outstanding "multiple IOMMUs
on the platform bus" problem by tweaking IOMMU API calls to prefer
dev->fwspec->ops before falling back to dev->bus->iommu_ops, and thus
gracefully handle those troublesome systems which we currently cannot.

As the first user, hook up the OF IOMMU configuration mechanism. The
driver-defined nature of DT cells means that we still need the drivers
to translate and add the IDs themselves, but future users such as the
much less free-form ACPI IORT will be much simpler and self-contained.

CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suggested-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-09-16 09:34:15 +01:00
Joerg Roedel f360d3241f Merge branches 'x86/amd', 'x86/vt-d', 'arm/exynos', 'arm/mediatek', 'arm/msm', 'arm/rockchip', 'arm/smmu' and 'core' into next 2016-07-26 16:02:37 +02:00
Joerg Roedel 33b21a6b20 iommu: Add apply_dm_region call-back to iommu-ops
This new call-back will be used by the iommu driver to do
reserve the given dm_region in its iova space before the
mapping is created.

The call-back is temporary until the dma-ops implementation
is part of the common iommu code.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
2016-07-13 12:46:05 +02:00
Heiner Kallweit feccf398db iommu: Simplify and fix ida handling
Ida handling can be much simplified by using the ida_simple_.. functions.

This change also fixes the bug that previously checking for errors
returned by ida_get_new() was incomplete.
ida_get_new() can return errors other than EAGAIN, e.g. ENOSPC.
This case wasn't handled.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2016-07-13 12:28:55 +02:00
Heiner Kallweit e38d1f1312 iommu: Simplify init function
iommu_group_ida and iommu_group_mutex can be initialized statically.
There's no need to do this dynamically in the init function.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2016-07-13 12:28:55 +02:00
Linus Torvalds e0fb1b3639 IOMMU Updates for Linux v4.7
The updates include:
 
 	* Rate limiting for the VT-d fault handler
 
 	* Remove statistics code from the AMD IOMMU driver. It is unused
 	  and should be replaced by something more generic if needed
 
 	* Per-domain pagesize-bitmaps in IOMMU core code to support
 	  systems with different types of IOMMUs
 
 	* Support for ACPI devices in the AMD IOMMU driver
 
 	* 4GB mode support for Mediatek IOMMU driver
 
 	* ARM-SMMU updates from Will Deacon:
 
 		- Support for 64k pages with SMMUv1 implementations
 		  (e.g MMU-401)
 
 		- Remove open-coded 64-bit MMIO accessors
 
 		- Initial support for 16-bit VMIDs, as supported by some
 		  ThunderX SMMU implementations
 
 		- A couple of errata workarounds for silicon in the
 		  field
 
 	* Various fixes here and there
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Merge tag 'iommu-updates-v4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull IOMMU updates from Joerg Roedel:
 "The updates include:

   - rate limiting for the VT-d fault handler

   - remove statistics code from the AMD IOMMU driver.  It is unused and
     should be replaced by something more generic if needed

   - per-domain pagesize-bitmaps in IOMMU core code to support systems
     with different types of IOMMUs

   - support for ACPI devices in the AMD IOMMU driver

   - 4GB mode support for Mediatek IOMMU driver

   - ARM-SMMU updates from Will Deacon:
      - support for 64k pages with SMMUv1 implementations (e.g MMU-401)
      - remove open-coded 64-bit MMIO accessors
      - initial support for 16-bit VMIDs, as supported by some ThunderX
        SMMU implementations
      - a couple of errata workarounds for silicon in the field

   - various fixes here and there"

* tag 'iommu-updates-v4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (44 commits)
  iommu/arm-smmu: Use per-domain page sizes.
  iommu/amd: Remove statistics code
  iommu/dma: Finish optimising higher-order allocations
  iommu: Allow selecting page sizes per domain
  iommu: of: enforce const-ness of struct iommu_ops
  iommu: remove unused priv field from struct iommu_ops
  iommu/dma: Implement scatterlist segment merging
  iommu/arm-smmu: Clear cache lock bit of ACR
  iommu/arm-smmu: Support SMMUv1 64KB supplement
  iommu/arm-smmu: Decouple context format from kernel config
  iommu/arm-smmu: Tidy up 64-bit/atomic I/O accesses
  io-64-nonatomic: Add relaxed accessor variants
  iommu/arm-smmu: Work around MMU-500 prefetch errata
  iommu/arm-smmu: Convert ThunderX workaround to new method
  iommu/arm-smmu: Differentiate specific implementations
  iommu/arm-smmu: Workaround for ThunderX erratum #27704
  iommu/arm-smmu: Add support for 16 bit VMID
  iommu/amd: Move get_device_id() and friends to beginning of file
  iommu/amd: Don't use IS_ERR_VALUE to check integer values
  iommu/amd: Signedness bug in acpihid_device_group()
  ...
2016-05-19 17:07:04 -07:00
Linus Torvalds 7afd16f882 PCI changes for the v4.7 merge window:
Enumeration
     Refine PCI support check in pcibios_init() (Adrian-Ken Rueegsegger)
     Provide common functions for ECAM mapping (Jayachandran C)
     Allow all PCIe services on non-ACPI host bridges (Jon Derrick)
     Remove return values from pcie_port_platform_notify() and relatives (Jon Derrick)
     Widen portdrv service type from 4 bits to 8 bits (Keith Busch)
     Add Downstream Port Containment portdrv service type (Keith Busch)
     Add Downstream Port Containment driver (Keith Busch)
 
   Resource management
     Identify Enhanced Allocation (EA) BAR Equivalent resources in sysfs (Alex Williamson)
     Supply CPU physical address (not bus address) to iomem_is_exclusive() (Bjorn Helgaas)
     alpha: Call iomem_is_exclusive() for IORESOURCE_MEM, but not IORESOURCE_IO (Bjorn Helgaas)
     Mark Broadwell-EP Home Agent 1 as having non-compliant BARs (Prarit Bhargava)
     Disable all BAR sizing for devices with non-compliant BARs (Prarit Bhargava)
     Move PCI I/O space management from OF to PCI core code (Tomasz Nowicki)
 
   PCI device hotplug
     acpiphp_ibm: Avoid uninitialized variable reference (Dan Carpenter)
     Use cached copy of PCI_EXP_SLTCAP_HPC bit (Lukas Wunner)
 
   Virtualization
     Mark Intel i40e NIC INTx masking as broken (Alex Williamson)
     Reverse standard ACS vs device-specific ACS enabling (Alex Williamson)
     Work around Intel Sunrise Point PCH incorrect ACS capability (Alex Williamson)
 
   IOMMU
     Add pci_add_dma_alias() to abstract implementation (Bjorn Helgaas)
     Move informational printk to pci_add_dma_alias() (Bjorn Helgaas)
     Add support for multiple DMA aliases (Jacek Lawrynowicz)
     Add DMA alias quirk for mic_x200_dma (Jacek Lawrynowicz)
 
   Thunderbolt
     Fix double free of drom buffer (Andreas Noever)
     Add Intel Thunderbolt device IDs (Lukas Wunner)
     Fix typos and magic number (Lukas Wunner)
     Support 1st gen Light Ridge controller (Lukas Wunner)
 
   Generic host bridge driver
     Use generic ECAM API (Jayachandran C)
 
   Cavium ThunderX host bridge driver
     Don't clobber read-only bits in bridge config registers (David Daney)
     Use generic ECAM API (Jayachandran C)
 
   Freescale i.MX6 host bridge driver
     Use enum instead of bool for variant indicator (Andrey Smirnov)
     Implement reset sequence for i.MX6+ (Andrey Smirnov)
     Factor out ref clock enable (Bjorn Helgaas)
     Add initial imx6sx support (Christoph Fritz)
     Add reset-gpio-active-high boolean property to DT (Petr Štetiar)
     Add DT property for link gen, default to Gen1 (Tim Harvey)
     dts: Specify imx6qp version of PCIe core (Andrey Smirnov)
     dts: Fix PCIe reset GPIO polarity on Toradex Apalis Ixora (Petr Štetiar)
 
   Marvell Armada host bridge driver
     add DT binding for Marvell Armada 7K/8K PCIe controller (Thomas Petazzoni)
     Add driver for Marvell Armada 7K/8K PCIe controller (Thomas Petazzoni)
 
   Marvell MVEBU host bridge driver
     Constify mvebu_pcie_pm_ops structure (Jisheng Zhang)
     Use SET_NOIRQ_SYSTEM_SLEEP_PM_OPS for mvebu_pcie_pm_ops (Jisheng Zhang)
 
   Microsoft Hyper-V host bridge driver
     Report resources release after stopping the bus (Vitaly Kuznetsov)
     Add explicit barriers to config space access (Vitaly Kuznetsov)
 
   Renesas R-Car host bridge driver
     Select PCI_MSI_IRQ_DOMAIN (Arnd Bergmann)
 
   Synopsys DesignWare host bridge driver
     Remove incorrect RC memory base/limit configuration (Gabriele Paoloni)
     Move Root Complex setup code to dw_pcie_setup_rc() (Jisheng Zhang)
 
   TI Keystone host bridge driver
     Add error IRQ handler (Murali Karicheri)
     Remove unnecessary goto statement (Murali Karicheri)
 
   Miscellaneous
     Fix spelling errors (Colin Ian King)
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Merge tag 'pci-v4.7-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

Pull PCI updates from Bjorn Helgaas:
 "Enumeration:
   - Refine PCI support check in pcibios_init() (Adrian-Ken Rueegsegger)
   - Provide common functions for ECAM mapping (Jayachandran C)
   - Allow all PCIe services on non-ACPI host bridges (Jon Derrick)
   - Remove return values from pcie_port_platform_notify() and relatives (Jon Derrick)
   - Widen portdrv service type from 4 bits to 8 bits (Keith Busch)
   - Add Downstream Port Containment portdrv service type (Keith Busch)
   - Add Downstream Port Containment driver (Keith Busch)

  Resource management:
   - Identify Enhanced Allocation (EA) BAR Equivalent resources in sysfs (Alex Williamson)
   - Supply CPU physical address (not bus address) to iomem_is_exclusive() (Bjorn Helgaas)
   - alpha: Call iomem_is_exclusive() for IORESOURCE_MEM, but not IORESOURCE_IO (Bjorn Helgaas)
   - Mark Broadwell-EP Home Agent 1 as having non-compliant BARs (Prarit Bhargava)
   - Disable all BAR sizing for devices with non-compliant BARs (Prarit Bhargava)
   - Move PCI I/O space management from OF to PCI core code (Tomasz Nowicki)

  PCI device hotplug:
   - acpiphp_ibm: Avoid uninitialized variable reference (Dan Carpenter)
   - Use cached copy of PCI_EXP_SLTCAP_HPC bit (Lukas Wunner)

  Virtualization:
   - Mark Intel i40e NIC INTx masking as broken (Alex Williamson)
   - Reverse standard ACS vs device-specific ACS enabling (Alex Williamson)
   - Work around Intel Sunrise Point PCH incorrect ACS capability (Alex Williamson)

  IOMMU:
   - Add pci_add_dma_alias() to abstract implementation (Bjorn Helgaas)
   - Move informational printk to pci_add_dma_alias() (Bjorn Helgaas)
   - Add support for multiple DMA aliases (Jacek Lawrynowicz)
   - Add DMA alias quirk for mic_x200_dma (Jacek Lawrynowicz)

  Thunderbolt:
   - Fix double free of drom buffer (Andreas Noever)
   - Add Intel Thunderbolt device IDs (Lukas Wunner)
   - Fix typos and magic number (Lukas Wunner)
   - Support 1st gen Light Ridge controller (Lukas Wunner)

  Generic host bridge driver:
   - Use generic ECAM API (Jayachandran C)

  Cavium ThunderX host bridge driver:
   - Don't clobber read-only bits in bridge config registers (David Daney)
   - Use generic ECAM API (Jayachandran C)

  Freescale i.MX6 host bridge driver:
   - Use enum instead of bool for variant indicator (Andrey Smirnov)
   - Implement reset sequence for i.MX6+ (Andrey Smirnov)
   - Factor out ref clock enable (Bjorn Helgaas)
   - Add initial imx6sx support (Christoph Fritz)
   - Add reset-gpio-active-high boolean property to DT (Petr Štetiar)
   - Add DT property for link gen, default to Gen1 (Tim Harvey)
   - dts: Specify imx6qp version of PCIe core (Andrey Smirnov)
   - dts: Fix PCIe reset GPIO polarity on Toradex Apalis Ixora (Petr Štetiar)

  Marvell Armada host bridge driver:
   - add DT binding for Marvell Armada 7K/8K PCIe controller (Thomas Petazzoni)
   - Add driver for Marvell Armada 7K/8K PCIe controller (Thomas Petazzoni)

  Marvell MVEBU host bridge driver:
   - Constify mvebu_pcie_pm_ops structure (Jisheng Zhang)
   - Use SET_NOIRQ_SYSTEM_SLEEP_PM_OPS for mvebu_pcie_pm_ops (Jisheng Zhang)

  Microsoft Hyper-V host bridge driver:
   - Report resources release after stopping the bus (Vitaly Kuznetsov)
   - Add explicit barriers to config space access (Vitaly Kuznetsov)

  Renesas R-Car host bridge driver:
   - Select PCI_MSI_IRQ_DOMAIN (Arnd Bergmann)

  Synopsys DesignWare host bridge driver:
   - Remove incorrect RC memory base/limit configuration (Gabriele Paoloni)
   - Move Root Complex setup code to dw_pcie_setup_rc() (Jisheng Zhang)

  TI Keystone host bridge driver:
   - Add error IRQ handler (Murali Karicheri)
   - Remove unnecessary goto statement (Murali Karicheri)

  Miscellaneous:
   - Fix spelling errors (Colin Ian King)"

* tag 'pci-v4.7-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (48 commits)
  PCI: Disable all BAR sizing for devices with non-compliant BARs
  x86/PCI: Mark Broadwell-EP Home Agent 1 as having non-compliant BARs
  PCI: Identify Enhanced Allocation (EA) BAR Equivalent resources in sysfs
  PCI, of: Move PCI I/O space management to PCI core code
  PCI: generic, thunder: Use generic ECAM API
  PCI: Provide common functions for ECAM mapping
  PCI: hv: Add explicit barriers to config space access
  PCI: Use cached copy of PCI_EXP_SLTCAP_HPC bit
  PCI: Add Downstream Port Containment driver
  PCI: Add Downstream Port Containment portdrv service type
  PCI: Widen portdrv service type from 4 bits to 8 bits
  PCI: designware: Remove incorrect RC memory base/limit configuration
  PCI: hv: Report resources release after stopping the bus
  ARM: dts: imx6qp: Specify imx6qp version of PCIe core
  PCI: imx6: Implement reset sequence for i.MX6+
  PCI: imx6: Use enum instead of bool for variant indicator
  PCI: thunder: Don't clobber read-only bits in bridge config registers
  thunderbolt: Fix double free of drom buffer
  PCI: rcar: Select PCI_MSI_IRQ_DOMAIN
  PCI: armada: Add driver for Marvell Armada 7K/8K PCIe controller
  ...
2016-05-19 13:10:54 -07:00
Robin Murphy d16e0faab9 iommu: Allow selecting page sizes per domain
Many IOMMUs support multiple page table formats, meaning that any given
domain may only support a subset of the hardware page sizes presented in
iommu_ops->pgsize_bitmap. There are also certain use-cases where the
creator of a domain may want to control which page sizes are used, for
example to force the use of hugepage mappings to reduce pagetable walk
depth.

To this end, add a per-domain pgsize_bitmap to represent the subset of
page sizes actually in use, to make it possible for domains with
different requirements to coexist.

Signed-off-by: Will Deacon <will.deacon@arm.com>
[rm: hijacked and rebased original patch with new commit message]
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2016-05-09 15:33:29 +02:00
Jacek Lawrynowicz 338c3149a2 PCI: Add support for multiple DMA aliases
Solve IOMMU support issues with PCIe non-transparent bridges that use
Requester ID look-up tables (RID-LUT), e.g., the PEX8733.

The NTB connects devices in two independent PCI domains.  Devices separated
by the NTB are not able to discover each other.  A PCI packet being
forwared from one domain to another has to have its RID modified so it
appears on correct bus and completions are forwarded back to the original
domain through the NTB.  The RID is translated using a preprogrammed table
(LUT) and the PCI packet propagates upstream away from the NTB.  If the
destination system has IOMMU enabled, the packet will be discarded because
the new RID is unknown to the IOMMU.  Adding a DMA alias for the new RID
allows IOMMU to properly recognize the packet.

Each device behind the NTB has a unique RID assigned in the RID-LUT.  The
current DMA alias implementation supports only a single alias, so it's not
possible to support mutiple devices behind the NTB when IOMMU is enabled.

Enable all possible aliases on a given bus (256) that are stored in a
bitset.  Alias devfn is directly translated to a bit number.  The bitset is
not allocated for devices that have no need for DMA aliases.

More details can be found in the following article:
http://www.plxtech.com/files/pdf/technical/expresslane/RTC_Enabling%20MulitHostSystemDesigns.pdf

Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: David Woodhouse <David.Woodhouse@intel.com>
Acked-by: Joerg Roedel <jroedel@suse.de>
2016-04-11 14:34:32 -05:00
Joerg Roedel eebb8034a5 iommu: Don't overwrite domain pointer when there is no default_domain
IOMMU drivers that do not support default domains, but make
use of the the group->domain pointer can get that pointer
overwritten with NULL on device add/remove.

Make sure this can't happen by only overwriting the domain
pointer when it is NULL.

Cc: stable@vger.kernel.org # v4.4+
Fixes: 1228236de5 ('iommu: Move default domain allocation to iommu_group_get_for_dev()')
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2016-04-07 14:33:03 +02:00
Yoshihiro Shimoda 06bfcaa91f iommu: Fix second argument of trace_map() to report correct paddr
Since iommu_map() code added pgsize value to the paddr, trace_map()
used wrong paddr. So, this patch adds "orig_paddr" value in the
iommu_map() to use for the trace_map().

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2016-02-25 14:57:22 +01:00
Dan Williams 3e6110fd54 Revert "scatterlist: use sg_phys()"
commit db0fa0cb01 "scatterlist: use sg_phys()" did replacements of
the form:

    phys_addr_t phys = page_to_phys(sg_page(s));
    phys_addr_t phys = sg_phys(s) & PAGE_MASK;

However, this breaks platforms where sizeof(phys_addr_t) >
sizeof(unsigned long).  Revert for 4.3 and 4.4 to make room for a
combined helper in 4.5.

Cc: <stable@vger.kernel.org>
Cc: Jens Axboe <axboe@fb.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Fixes: db0fa0cb01 ("scatterlist: use sg_phys()")
Suggested-by: Joerg Roedel <joro@8bytes.org>
Reported-by: Vitaly Lavrov <vel21ripn@gmail.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2015-12-15 12:54:06 -08:00
Joerg Roedel 1228236de5 iommu: Move default domain allocation to iommu_group_get_for_dev()
Now that the iommu core support for iommu groups is not
pci-centric anymore, we can move default domain allocation
to the bus independent iommu_group_get_for_dev() function.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
2015-10-22 00:00:49 +02:00
Joerg Roedel 391811e185 iommu: Remove is_pci_dev() fall-back from iommu_group_get_for_dev
All callers of iommu_group_get_for_dev() provide a
device_group call-back now, so this fall-back is no longer
needed.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
2015-10-22 00:00:49 +02:00
Joerg Roedel 6eab556a40 iommu: Add generic_device_group() function
This function can be used as a device_group call-back and
just allocates one iommu-group per device.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
2015-10-22 00:00:49 +02:00
Joerg Roedel 5e62292bad iommu: Export and rename iommu_group_get_for_pci_dev()
Rename that function to pci_device_group() and export it, so
that IOMMU drivers can use it as their device_group
call-back.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
2015-10-22 00:00:49 +02:00
Joerg Roedel 46c6b2bc88 iommu: Revive device_group iommu-ops call-back
That call-back is currently unused, change it into a
call-back function for finding the right IOMMU group for a
device.
This is a first step to remove the hard-coded PCI dependency
in the iommu-group code.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
2015-10-22 00:00:48 +02:00
Dan Williams db0fa0cb01 scatterlist: use sg_phys()
Coccinelle cleanup to replace open coded sg to physical address
translations.  This is in preparation for introducing scatterlists that
reference __pfn_t.

// sg_phys.cocci: convert usage page_to_phys(sg_page(sg)) to sg_phys(sg)
// usage: make coccicheck COCCI=sg_phys.cocci MODE=patch

virtual patch

@@
struct scatterlist *sg;
@@

- page_to_phys(sg_page(sg)) + sg->offset
+ sg_phys(sg)

@@
struct scatterlist *sg;
@@

- page_to_phys(sg_page(sg))
+ sg_phys(sg) & PAGE_MASK

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
2015-08-17 08:13:26 -06:00
Joerg Roedel 38667f1890 iommu: Ignore -ENODEV errors from add_device call-back
The -ENODEV error just means that the device is not
translated by an IOMMU. We shouldn't bail out of iommu
driver initialization when that happens, as this is a common
scenario on ARM.

Not returning -ENODEV in the drivers would be a bad idea, as
the IOMMU core would have no indication whether a device is
translated or not. This indication is not used at the
moment, but will probably be in the future.

Fixes: 19762d7 ("iommu: Propagate error in add_iommu_group")
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Eric Auger <eric.auger@linaro.org>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2015-06-29 21:57:19 +02:00
Joerg Roedel 5ffde2f671 Merge branches 'arm/rockchip', 'arm/exynos', 'arm/smmu', 'x86/vt-d', 'x86/amd', 'default-domains' and 'core' into next 2015-06-19 17:17:47 +02:00
Dan Carpenter 409e553dee iommu: Checking for NULL instead of IS_ERR
The iommu_group_alloc() and iommu_group_get_for_dev()
functions return error pointers, they never return NULL.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2015-06-11 09:42:25 +02:00
Joerg Roedel d290f1e70d iommu: Introduce iommu_request_dm_for_dev()
This function can be called by an IOMMU driver to request
that a device's default domain is direct mapped.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
2015-06-11 09:01:55 +02:00
Joerg Roedel 6827ca8369 iommu: Add function to query the default domain of a group
This will be used to handle unity mappings in the iommu
drivers.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
2015-06-09 08:55:24 +02:00
Joerg Roedel beed2821b4 iommu: Create direct mappings in default domains
Use the information exported by the IOMMU drivers to create
direct mapped regions in the default domains.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
2015-06-09 08:55:24 +02:00
Joerg Roedel a1015c2b99 iommu: Introduce direct mapped region handling
Add two new functions to the IOMMU-API to allow the IOMMU
drivers to export the requirements for direct mapped regions
per device.
This is useful for exporting the information in Intel VT-d's
RMRR entries or AMD-Vi's unity mappings.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
2015-06-09 08:55:23 +02:00
Joerg Roedel 2c1296d92a iommu: Add iommu_get_domain_for_dev function
This function can be used to request the current domain a
device is attached to.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
2015-06-09 08:55:23 +02:00
Joerg Roedel e39cb8a3aa iommu: Make sure a device is always attached to a domain
Make use of the default domain and re-attach a device to it
when it is detached from another domain. Also enforce that a
device has to be in the default domain before it can be
attached to a different domain.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
2015-06-09 08:55:22 +02:00