platform/kernel/linux-rpi.git
4 years agoACPI/IORT: Parse SSID property of named component node
Jean-Philippe Brucker [Wed, 15 Jan 2020 12:52:30 +0000 (13:52 +0100)]
ACPI/IORT: Parse SSID property of named component node

Named component nodes in the IORT tables describe the number of
Substream ID bits (aka. PASID) supported by the device. Propagate this
value to the fwspec structure in order to enable PASID for platform
devices.

Acked-by: Hanjun Guo <guohanjun@huawei.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoiommu/arm-smmu-v3: Parse PASID devicetree property of platform devices
Jean-Philippe Brucker [Wed, 15 Jan 2020 12:52:29 +0000 (13:52 +0100)]
iommu/arm-smmu-v3: Parse PASID devicetree property of platform devices

For platform devices that support SubstreamID (SSID), firmware provides
the number of supported SSID bits. Restrict it to what the SMMU supports
and cache it into master->ssid_bits, which will also be used for PCI
PASID.

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Will Deacon <will@kernel.org>
4 years agodt-bindings: document PASID property for IOMMU masters
Jean-Philippe Brucker [Wed, 15 Jan 2020 12:52:28 +0000 (13:52 +0100)]
dt-bindings: document PASID property for IOMMU masters

On Arm systems, some platform devices behind an SMMU may support the PASID
feature, which offers multiple address space. Let the firmware tell us
when a device supports PASID.

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoiommu/arm-smmu-v3: Drop __GFP_ZERO flag from DMA allocation
Jean-Philippe Brucker [Wed, 15 Jan 2020 12:52:27 +0000 (13:52 +0100)]
iommu/arm-smmu-v3: Drop __GFP_ZERO flag from DMA allocation

Since commit 518a2f1925c3 ("dma-mapping: zero memory returned from
dma_alloc_*"), dma_alloc_* always initializes memory to zero, so there
is no need to use dma_zalloc_* or pass the __GFP_ZERO flag anymore.

The flag was introduced by commit 04fa26c71be5 ("iommu/arm-smmu: Convert
DMA buffer allocations to the managed API"), since the managed API
didn't provide a dmam_zalloc_coherent() function.

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoiommu/arm-smmu: Improve SMR mask test
Robin Murphy [Fri, 10 Jan 2020 15:25:02 +0000 (15:25 +0000)]
iommu/arm-smmu: Improve SMR mask test

Make the SMR mask test more robust against SMR0 being live
at probe time, which might happen once we start supporting
firmware reservations for framebuffers and suchlike.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoiommu/io-pgtable-arm: Prepare for TTBR1 usage
Robin Murphy [Fri, 25 Oct 2019 18:08:39 +0000 (19:08 +0100)]
iommu/io-pgtable-arm: Prepare for TTBR1 usage

Now that we can correctly extract top-level indices without relying on
the remaining upper bits being zero, the only remaining impediments to
using a given table for TTBR1 are the address validation on map/unmap
and the awkward TCR translation granule format. Add a quirk so that we
can do the right thing at those points.

Tested-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoiommu/io-pgtable-arm: Rationalise VTCR handling
Will Deacon [Fri, 10 Jan 2020 14:51:59 +0000 (14:51 +0000)]
iommu/io-pgtable-arm: Rationalise VTCR handling

Commit 05a648cd2dd7 ("iommu/io-pgtable-arm: Rationalise TCR handling")
reworked the way in which the TCR register value is returned from the
io-pgtable code when targetting the Arm long-descriptor format, in
preparation for allowing page-tables to target TTBR1.

As it turns out, the new interface is a lot nicer to use, so do the same
conversion for the VTCR register even though there is only a single base
register for stage-2 translation.

Cc: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoiommu/arm-smmu: Rename public #defines under ARM_SMMU_ namespace
Will Deacon [Fri, 10 Jan 2020 13:20:03 +0000 (13:20 +0000)]
iommu/arm-smmu: Rename public #defines under ARM_SMMU_ namespace

Now that we have arm-smmu.h defining various SMMU constants, ensure that
they are namespaced with the ARM_SMMU_ prefix in order to avoid conflicts
with the CPU, such as the one we're currently bodging around with the
TCR.

Cc: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoiommu/io-pgtable-arm: Rationalise TCR handling
Robin Murphy [Fri, 25 Oct 2019 18:08:38 +0000 (19:08 +0100)]
iommu/io-pgtable-arm: Rationalise TCR handling

Although it's conceptually nice for the io_pgtable_cfg to provide a
standard VMSA TCR value, the reality is that no VMSA-compliant IOMMU
looks exactly like an Arm CPU, and they all have various other TCR
controls which io-pgtable can't be expected to understand. Thus since
there is an expectation that drivers will have to add to the given TCR
value anyway, let's strip it down to just the essentials that are
directly relevant to io-pgtable's inner workings - namely the various
sizes and the walk attributes.

Tested-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
[will: Add missing include of bitfield.h]
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoiommu/io-pgtable-arm: Ensure ARM_64_LPAE_S2_TCR_RES1 is unsigned
Will Deacon [Fri, 10 Jan 2020 12:22:16 +0000 (12:22 +0000)]
iommu/io-pgtable-arm: Ensure ARM_64_LPAE_S2_TCR_RES1 is unsigned

ARM_64_LPAE_S2_TCR_RES1 is intended to map to bit 31 of the VTCR register,
which is required to be set to 1 by the architecture. Unfortunately, we
accidentally treat this as a signed quantity which means we also set the
upper 32 bits of the VTCR to one, and they are required to be zero.

Treat ARM_64_LPAE_S2_TCR_RES1 as unsigned to avoid the unwanted
sign-extension up to 64 bits.

Cc: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoiommu/io-pgtable-arm: Improve attribute handling
Robin Murphy [Fri, 10 Jan 2020 15:21:51 +0000 (15:21 +0000)]
iommu/io-pgtable-arm: Improve attribute handling

By VMSA rules, using Normal Non-Cacheable type with a shareability
attribute of anything other than Outer Shareable is liable to lead into
unpredictable territory:

| Overlaying the shareability attribute (B3-1377, ARM DDI 0406C.c)
|
| A memory region with a resultant memory type attribute of Normal, and
| a resultant cacheability attribute of Inner Non-cacheable, Outer
| Non-cacheable, must have a resultant shareability attribute of Outer
| Shareable, otherwise shareability is UNPREDICTABLE

Although the SMMU architectures seem to give some slightly stronger
guarantees of Non-Cacheable output types becoming implicitly Outer
Shareable in most cases, we may as well be explicit and not take any
chances. It's also weird that LPAE attribute handling is currently split
between prot_to_pte() and init_pte() given that it can all be statically
determined up-front. Thus, collect *all* the LPAE attributes into
prot_to_pte() in order to logically pick the shareability based on the
incoming IOMMU API prot value, and tweak the short-descriptor code to
stop setting TTBR0.NOS for Non-Cacheable walks.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoiommu/io-pgtable-arm: Support non-coherent stage-2 page tables
Will Deacon [Fri, 10 Jan 2020 11:40:33 +0000 (11:40 +0000)]
iommu/io-pgtable-arm: Support non-coherent stage-2 page tables

Commit 9e6ea59f3ff3 ("iommu/io-pgtable: Support non-coherent page tables")
added support for non-coherent page-table walks to the Arm IOMMU page-table
backends. Unfortunately, it left the stage-2 allocator unchanged, so let's
hook that up in the same way.

Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoiommu/io-pgtable-arm: Rationalise TTBRn handling
Robin Murphy [Fri, 25 Oct 2019 18:08:37 +0000 (19:08 +0100)]
iommu/io-pgtable-arm: Rationalise TTBRn handling

TTBR1 values have so far been redundant since no users implement any
support for split address spaces. Crucially, though, one of the main
reasons for wanting to do so is to be able to manage each half entirely
independently, e.g. context-switching one set of mappings without
disturbing the other. Thus it seems unlikely that tying two tables
together in a single io_pgtable_cfg would ever be particularly desirable
or useful.

Streamline the configs to just a single conceptual TTBR value
representing the allocated table. This paves the way for future users to
support split address spaces by simply allocating a table and dealing
with the detailed TTBRn logistics themselves.

Tested-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
[will: Drop change to ttbr value]
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoiommu/arm-smmu: Fix -Wunused-const-variable warning
Masahiro Yamada [Tue, 24 Dec 2019 08:15:00 +0000 (17:15 +0900)]
iommu/arm-smmu: Fix -Wunused-const-variable warning

For ARCH=arm builds, OF is not necessarily enabled, that is, you can
build this driver without CONFIG_OF.

When CONFIG_OF is unset, of_match_ptr() is NULL, and arm_smmu_of_match
is left orphan.

Building it with W=1 emits a warning:

drivers/iommu/arm-smmu.c:1904:34: warning: ‘arm_smmu_of_match’ defined but not used [-Wunused-const-variable=]
 static const struct of_device_id arm_smmu_of_match[] = {
                                  ^~~~~~~~~~~~~~~~~

There are two ways to fix this:

 - annotate arm_smmu_of_match with __maybe_unused (or surround the
   code with #ifdef CONFIG_OF ... #endif)

 - stop using of_match_ptr()

This commit took the latter solution.

It slightly increases the object size, but it is probably not a big deal
because arm_smmu_device_dt_probe() is also compiled irrespective of
CONFIG_OF.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoiommu/arm-smmu-v3: Remove useless of_match_ptr()
Masahiro Yamada [Tue, 24 Dec 2019 08:14:59 +0000 (17:14 +0900)]
iommu/arm-smmu-v3: Remove useless of_match_ptr()

The CONFIG option controlling this driver, ARM_SMMU_V3,
depends on ARM64, which select's OF.

So, CONFIG_OF is always defined when building this driver.
of_match_ptr(arm_smmu_of_match) is the same as arm_smmu_of_match.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoiommu/arm-smmu-v3: Fix resource_size check
Masahiro Yamada [Thu, 26 Dec 2019 09:50:56 +0000 (18:50 +0900)]
iommu/arm-smmu-v3: Fix resource_size check

This is an off-by-one mistake.

resource_size() returns res->end - res->start + 1.

Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoiommu/arm-smmu-v3: Populate VMID field for CMDQ_OP_TLBI_NH_VA
Shameer Kolothum [Wed, 13 Nov 2019 16:11:38 +0000 (16:11 +0000)]
iommu/arm-smmu-v3: Populate VMID field for CMDQ_OP_TLBI_NH_VA

CMDQ_OP_TLBI_NH_VA requires VMID and this was missing since
commit 1c27df1c0a82 ("iommu/arm-smmu: Use correct address mask
for CMD_TLBI_S2_IPA"). Add it back.

Fixes: 1c27df1c0a82 ("iommu/arm-smmu: Use correct address mask for CMD_TLBI_S2_IPA")
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Signed-off-by: Will Deacon <will@kernel.org>
4 years agodrivers/iommu: Initialise module 'owner' field in iommu_device_set_ops()
Will Deacon [Thu, 9 Jan 2020 14:08:41 +0000 (14:08 +0000)]
drivers/iommu: Initialise module 'owner' field in iommu_device_set_ops()

Requiring each IOMMU driver to initialise the 'owner' field of their
'struct iommu_ops' is error-prone and easily forgotten. Follow the
example set by PCI and USB by assigning THIS_MODULE automatically when
registering the ops structure with IOMMU core.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoiommu/arm-smmu: Update my email address in MODULE_AUTHOR()
Will Deacon [Thu, 19 Dec 2019 12:03:52 +0000 (12:03 +0000)]
iommu/arm-smmu: Update my email address in MODULE_AUTHOR()

I no longer work for Arm, so update the stale reference to my old email
address.

Signed-off-by: Will Deacon <will@kernel.org>
Tested-by: John Garry <john.garry@huawei.com> # smmu v3
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
4 years agoiommu/arm-smmu: Allow building as a module
Will Deacon [Thu, 19 Dec 2019 12:03:51 +0000 (12:03 +0000)]
iommu/arm-smmu: Allow building as a module

By conditionally dropping support for the legacy binding and exporting
the newly introduced 'arm_smmu_impl_init()' function we can allow the
ARM SMMU driver to be built as a module.

Signed-off-by: Will Deacon <will@kernel.org>
Tested-by: John Garry <john.garry@huawei.com> # smmu v3
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
4 years agoiommu/arm-smmu: Unregister IOMMU and bus ops on device removal
Will Deacon [Thu, 19 Dec 2019 12:03:50 +0000 (12:03 +0000)]
iommu/arm-smmu: Unregister IOMMU and bus ops on device removal

When removing the SMMU driver, we need to clear any state that we
registered during probe. This includes our bus ops, sysfs entries and
the IOMMU device registered for early firmware probing of masters.

Signed-off-by: Will Deacon <will@kernel.org>
Tested-by: John Garry <john.garry@huawei.com> # smmu v3
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
4 years agoiommu/arm-smmu-v3: Allow building as a module
Will Deacon [Thu, 19 Dec 2019 12:03:49 +0000 (12:03 +0000)]
iommu/arm-smmu-v3: Allow building as a module

By removing the redundant call to 'pci_request_acs()' we can allow the
ARM SMMUv3 driver to be built as a module.

Signed-off-by: Will Deacon <will@kernel.org>
Tested-by: John Garry <john.garry@huawei.com> # smmu v3
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
4 years agoiommu/arm-smmu: Support SMMU module probing from the IORT
Ard Biesheuvel [Thu, 19 Dec 2019 12:03:48 +0000 (12:03 +0000)]
iommu/arm-smmu: Support SMMU module probing from the IORT

Add support for SMMU drivers built as modules to the ACPI/IORT device
probing path, by deferring the probe of the master if the SMMU driver is
known to exist but has not been loaded yet. Given that the IORT code
registers a platform device for each SMMU that it discovers, we can
easily trigger the udev based autoloading of the SMMU drivers by making
the platform device identifier part of the module alias.

Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Tested-by: John Garry <john.garry@huawei.com> # only manual smmu ko loading
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
Tested-by: John Garry <john.garry@huawei.com> # smmu v3
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
4 years agoiommu/arm-smmu-v3: Unregister IOMMU and bus ops on device removal
Will Deacon [Thu, 19 Dec 2019 12:03:47 +0000 (12:03 +0000)]
iommu/arm-smmu-v3: Unregister IOMMU and bus ops on device removal

When removing the SMMUv3 driver, we need to clear any state that we
registered during probe. This includes our bus ops, sysfs entries and
the IOMMU device registered for early firmware probing of masters.

Signed-off-by: Will Deacon <will@kernel.org>
Tested-by: John Garry <john.garry@huawei.com> # smmu v3
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
4 years agoiommu/arm-smmu: Prevent forced unbinding of Arm SMMU drivers
Will Deacon [Thu, 19 Dec 2019 12:03:46 +0000 (12:03 +0000)]
iommu/arm-smmu: Prevent forced unbinding of Arm SMMU drivers

Forcefully unbinding the Arm SMMU drivers is a pretty dangerous operation,
since it will likely lead to catastrophic failure for any DMA devices
mastering through the SMMU being unbound. When the driver then attempts
to "handle" the fatal faults, it's very easy to trip over dead data
structures, leading to use-after-free.

On John's machine, he reports that the machine was "unusable" due to
loss of the storage controller following a forced unbind of the SMMUv3
driver:

  | # cd ./bus/platform/drivers/arm-smmu-v3
  | # echo arm-smmu-v3.0.auto > unbind
  | hisi_sas_v2_hw HISI0162:01: CQE_AXI_W_ERR (0x800) found!
  | platform arm-smmu-v3.0.auto: CMD_SYNC timeout at 0x00000146
  | [hwprod 0x00000146, hwcons 0x00000000]

Prevent this forced unbinding of the drivers by setting "suppress_bind_attrs"
to true.

Link: https://lore.kernel.org/lkml/06dfd385-1af0-3106-4cc5-6a5b8e864759@huawei.com
Reported-by: John Garry <john.garry@huawei.com>
Signed-off-by: Will Deacon <will@kernel.org>
Tested-by: John Garry <john.garry@huawei.com> # smmu v3
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
4 years agoRevert "iommu/arm-smmu: Make arm-smmu explicitly non-modular"
Will Deacon [Thu, 19 Dec 2019 12:03:45 +0000 (12:03 +0000)]
Revert "iommu/arm-smmu: Make arm-smmu explicitly non-modular"

This reverts commit addb672f200f4e99368270da205320b83efe01a0.

Let's get the SMMU driver building as a module, which means putting
back some dead code that we used to carry.

Signed-off-by: Will Deacon <will@kernel.org>
Tested-by: John Garry <john.garry@huawei.com> # smmu v3
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
4 years agoRevert "iommu/arm-smmu: Make arm-smmu-v3 explicitly non-modular"
Will Deacon [Thu, 19 Dec 2019 12:03:44 +0000 (12:03 +0000)]
Revert "iommu/arm-smmu: Make arm-smmu-v3 explicitly non-modular"

This reverts commit c07b6426df922d21a13a959cf785d46e9c531941.

Let's get the SMMUv3 driver building as a module, which means putting
back some dead code that we used to carry.

Signed-off-by: Will Deacon <will@kernel.org>
Tested-by: John Garry <john.garry@huawei.com> # smmu v3
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
4 years agodrivers/iommu: Allow IOMMU bus ops to be unregistered
Will Deacon [Thu, 19 Dec 2019 12:03:43 +0000 (12:03 +0000)]
drivers/iommu: Allow IOMMU bus ops to be unregistered

'bus_set_iommu()' allows IOMMU drivers to register their ops for a given
bus type. Unfortunately, it then doesn't allow them to be removed, which
is necessary for modular drivers to shutdown cleanly so that they can be
reloaded later on.

Allow 'bus_set_iommu()' to take a NULL 'ops' argument, which clear the
ops pointer for the selected bus_type.

Signed-off-by: Will Deacon <will@kernel.org>
Tested-by: John Garry <john.garry@huawei.com> # smmu v3
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
4 years agoiommu/of: Take a ref to the IOMMU driver during ->of_xlate()
Will Deacon [Thu, 19 Dec 2019 12:03:42 +0000 (12:03 +0000)]
iommu/of: Take a ref to the IOMMU driver during ->of_xlate()

Ensure that we hold a reference to the IOMMU driver module while calling
the '->of_xlate()' callback during early device probing.

Signed-off-by: Will Deacon <will@kernel.org>
Tested-by: John Garry <john.garry@huawei.com> # smmu v3
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
4 years agodrivers/iommu: Take a ref to the IOMMU driver prior to ->add_device()
Will Deacon [Thu, 19 Dec 2019 12:03:41 +0000 (12:03 +0000)]
drivers/iommu: Take a ref to the IOMMU driver prior to ->add_device()

To avoid accidental removal of an active IOMMU driver module, take a
reference to the driver module in 'iommu_probe_device()' immediately
prior to invoking the '->add_device()' callback and hold it until the
after the device has been removed by '->remove_device()'.

Suggested-by: Joerg Roedel <joro@8bytes.org>
Signed-off-by: Will Deacon <will@kernel.org>
Tested-by: John Garry <john.garry@huawei.com> # smmu v3
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
4 years agoPCI: Export pci_ats_disabled() as a GPL symbol to modules
Will Deacon [Thu, 19 Dec 2019 12:03:40 +0000 (12:03 +0000)]
PCI: Export pci_ats_disabled() as a GPL symbol to modules

Building drivers for ATS-aware IOMMUs as modules requires access to
pci_ats_disabled(). Export it as a GPL symbol to get things working.

Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
Tested-by: John Garry <john.garry@huawei.com> # smmu v3
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
4 years agoPCI/ATS: Restore EXPORT_SYMBOL_GPL() for pci_{enable,disable}_ats()
Greg Kroah-Hartman [Thu, 19 Dec 2019 12:03:39 +0000 (12:03 +0000)]
PCI/ATS: Restore EXPORT_SYMBOL_GPL() for pci_{enable,disable}_ats()

Commit d355bb209783 ("PCI/ATS: Remove unnecessary EXPORT_SYMBOL_GPL()")
unexported a bunch of symbols from the PCI core since the only external
users were non-modular IOMMU drivers. Although most of those symbols
can remain private for now, 'pci_{enable,disable_ats()' is required for
the ARM SMMUv3 driver to build as a module, otherwise we get a build
failure as follows:

  | ERROR: "pci_enable_ats" [drivers/iommu/arm-smmu-v3.ko] undefined!
  | ERROR: "pci_disable_ats" [drivers/iommu/arm-smmu-v3.ko] undefined!

Re-export these two functions so that the ARM SMMUv3 driver can be build
as a module.

Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
[will: rewrote commit message]
Signed-off-by: Will Deacon <will@kernel.org>
Tested-by: John Garry <john.garry@huawei.com> # smmu v3
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
4 years agoiommu/of: Request ACS from the PCI core when configuring IOMMU linkage
Will Deacon [Thu, 19 Dec 2019 12:03:38 +0000 (12:03 +0000)]
iommu/of: Request ACS from the PCI core when configuring IOMMU linkage

To avoid having to export 'pci_request_acs()' to modular IOMMU drivers,
move the call into the 'of_dma_configure()' path in a similar manner to
the way in which ACS is configured when probing via ACPI/IORT.

Signed-off-by: Will Deacon <will@kernel.org>
Tested-by: John Garry <john.garry@huawei.com> # smmu v3
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
4 years agodrivers/iommu: Export core IOMMU API symbols to permit modular drivers
Will Deacon [Thu, 19 Dec 2019 12:03:37 +0000 (12:03 +0000)]
drivers/iommu: Export core IOMMU API symbols to permit modular drivers

Building IOMMU drivers as modules requires that the core IOMMU API
symbols are exported as GPL symbols.

Signed-off-by: Will Deacon <will@kernel.org>
Tested-by: John Garry <john.garry@huawei.com> # smmu v3
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
4 years agoLinux 5.5-rc3
Linus Torvalds [Mon, 23 Dec 2019 01:02:23 +0000 (17:02 -0800)]
Linux 5.5-rc3

4 years agoMerge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Linus Torvalds [Mon, 23 Dec 2019 01:00:04 +0000 (17:00 -0800)]
Merge branch 'fixes' of git://git./linux/kernel/git/viro/vfs

Pull vfs fixes from Al Viro:
 "Eric's s_inodes softlockup fixes + Jan's fix for recent regression
  from pipe rework"

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  fs: call fsnotify_sb_delete after evict_inodes
  fs: avoid softlockups in s_inodes iterators
  pipe: Fix bogus dereference in iov_iter_alignment()

4 years agoMerge tag 'xfs-5.5-fixes-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Linus Torvalds [Sun, 22 Dec 2019 18:59:06 +0000 (10:59 -0800)]
Merge tag 'xfs-5.5-fixes-2' of git://git./fs/xfs/xfs-linux

Pull xfs fixes from Darrick Wong:
 "Fix a few bugs that could lead to corrupt files, fsck complaints, and
  filesystem crashes:

   - Minor documentation fixes

   - Fix a file corruption due to read racing with an insert range
     operation.

   - Fix log reservation overflows when allocating large rt extents

   - Fix a buffer log item flags check

   - Don't allow administrators to mount with sunit= options that will
     cause later xfs_repair complaints about the root directory being
     suspicious because the fs geometry appeared inconsistent

   - Fix a non-static helper that should have been static"

* tag 'xfs-5.5-fixes-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  xfs: Make the symbol 'xfs_rtalloc_log_count' static
  xfs: don't commit sunit/swidth updates to disk if that would cause repair failures
  xfs: split the sunit parameter update into two parts
  xfs: refactor agfl length computation function
  libxfs: resync with the userspace libxfs
  xfs: use bitops interface for buf log item AIL flag check
  xfs: fix log reservation overflows when allocating large rt extents
  xfs: stabilize insert range start boundary to avoid COW writeback race
  xfs: fix Sphinx documentation warning

4 years agoMerge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sun, 22 Dec 2019 18:41:48 +0000 (10:41 -0800)]
Merge tag 'ext4_for_linus_stable' of git://git./linux/kernel/git/tytso/ext4

Pull ext4 bug fixes from Ted Ts'o:
 "Ext4 bug fixes, including a regression fix"

* tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: clarify impact of 'commit' mount option
  ext4: fix unused-but-set-variable warning in ext4_add_entry()
  jbd2: fix kernel-doc notation warning
  ext4: use RCU API in debug_print_tree
  ext4: validate the debug_want_extra_isize mount option at parse time
  ext4: reserve revoke credits in __ext4_new_inode
  ext4: unlock on error in ext4_expand_extra_isize()
  ext4: optimize __ext4_check_dir_entry()
  ext4: check for directory entries too close to block end
  ext4: fix ext4_empty_dir() for directories with holes

4 years agoMerge tag 'block-5.5-20191221' of git://git.kernel.dk/linux-block
Linus Torvalds [Sun, 22 Dec 2019 18:36:55 +0000 (10:36 -0800)]
Merge tag 'block-5.5-20191221' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
 "Let's try this one again, this time without the compat_ioctl changes.
  We've got those fixed up, but that can go out next week.

  This contains:

   - block queue flush lockdep annotation (Bart)

   - Type fix for bsg_queue_rq() (Bart)

   - Three dasd fixes (Stefan, Jan)

   - nbd deadlock fix (Mike)

   - Error handling bio user map fix (Yang)

   - iocost fix (Tejun)

   - sbitmap waitqueue addition fix that affects the kyber IO scheduler
     (David)"

* tag 'block-5.5-20191221' of git://git.kernel.dk/linux-block:
  sbitmap: only queue kyber's wait callback if not already active
  block: fix memleak when __blk_rq_map_user_iov() is failed
  s390/dasd: fix typo in copyright statement
  s390/dasd: fix memleak in path handling error case
  s390/dasd/cio: Interpret ccw_device_get_mdc return value correctly
  block: Fix a lockdep complaint triggered by request queue flushing
  block: Fix the type of 'sts' in bsg_queue_rq()
  block: end bio with BLK_STS_AGAIN in case of non-mq devs and REQ_NOWAIT
  nbd: fix shutdown and recv work deadlock v2
  iocost: over-budget forced IOs should schedule async delay

4 years agoMerge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Linus Torvalds [Sun, 22 Dec 2019 18:26:59 +0000 (10:26 -0800)]
Merge tag 'for-linus' of git://git./virt/kvm/kvm

Pull KVM fixes from Paolo Bonzini:
 "PPC:
   - Fix a bug where we try to do an ultracall on a system without an
     ultravisor

  KVM:
   - Fix uninitialised sysreg accessor
   - Fix handling of demand-paged device mappings
   - Stop spamming the console on IMPDEF sysregs
   - Relax mappings of writable memslots
   - Assorted cleanups

  MIPS:
   - Now orphan, James Hogan is stepping down

  x86:
   - MAINTAINERS change, so long Radim and thanks for all the fish
   - supported CPUID fixes for AMD machines without SPEC_CTRL"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  MAINTAINERS: remove Radim from KVM maintainers
  MAINTAINERS: Orphan KVM for MIPS
  kvm: x86: Host feature SSBD doesn't imply guest feature AMD_SSBD
  kvm: x86: Host feature SSBD doesn't imply guest feature SPEC_CTRL_SSBD
  KVM: PPC: Book3S HV: Don't do ultravisor calls on systems without ultravisor
  KVM: arm/arm64: Properly handle faulting of device mappings
  KVM: arm64: Ensure 'params' is initialised when looking up sys register
  KVM: arm/arm64: Remove excessive permission check in kvm_arch_prepare_memory_region
  KVM: arm64: Don't log IMP DEF sysreg traps
  KVM: arm64: Sanely ratelimit sysreg messages
  KVM: arm/arm64: vgic: Use wrapper function to lock/unlock all vcpus in kvm_vgic_create()
  KVM: arm/arm64: vgic: Fix potential double free dist->spis in __kvm_vgic_destroy()
  KVM: arm/arm64: Get rid of unused arg in cpu_init_hyp_mode()

4 years agoMerge tag 'riscv/for-v5.5-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv...
Linus Torvalds [Sun, 22 Dec 2019 18:22:47 +0000 (10:22 -0800)]
Merge tag 'riscv/for-v5.5-rc3' of git://git./linux/kernel/git/riscv/linux

Pull RISC-V fixes from Paul Walmsley:
 "Several fixes, and one cleanup, for RISC-V.

  Fixes:

   - Fix an error in a Kconfig file that resulted in an undefined
     Kconfig option "CONFIG_CONFIG_MMU"

   - Fix undefined Kconfig option "CONFIG_CONFIG_MMU"

   - Fix scratch register clearing in M-mode (affects nommu users)

   - Fix a mismerge on my part that broke the build for
     CONFIG_SPARSEMEM_VMEMMAP users

  Cleanup:

   - Move SiFive L2 cache-related code to drivers/soc, per request"

* tag 'riscv/for-v5.5-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  riscv: move sifive_l2_cache.c to drivers/soc
  riscv: define vmemmap before pfn_to_page calls
  riscv: fix scratch register clearing in M-mode.
  riscv: Fix use of undefined config option CONFIG_CONFIG_MMU

4 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Linus Torvalds [Sun, 22 Dec 2019 17:54:33 +0000 (09:54 -0800)]
Merge git://git./linux/kernel/git/netdev/net

Pull networking fixes from David Miller:

 1) Several nf_flow_table_offload fixes from Pablo Neira Ayuso,
    including adding a missing ipv6 match description.

 2) Several heap overflow fixes in mwifiex from qize wang and Ganapathi
    Bhat.

 3) Fix uninit value in bond_neigh_init(), from Eric Dumazet.

 4) Fix non-ACPI probing of nxp-nci, from Stephan Gerhold.

 5) Fix use after free in tipc_disc_rcv(), from Tuong Lien.

 6) Enforce limit of 33 tail calls in mips and riscv JIT, from Paul
    Chaignon.

 7) Multicast MAC limit test is off by one in qede, from Manish Chopra.

 8) Fix established socket lookup race when socket goes from
    TCP_ESTABLISHED to TCP_LISTEN, because there lacks an intervening
    RCU grace period. From Eric Dumazet.

 9) Don't send empty SKBs from tcp_write_xmit(), also from Eric Dumazet.

10) Fix active backup transition after link failure in bonding, from
    Mahesh Bandewar.

11) Avoid zero sized hash table in gtp driver, from Taehee Yoo.

12) Fix wrong interface passed to ->mac_link_up(), from Russell King.

13) Fix DSA egress flooding settings in b53, from Florian Fainelli.

14) Memory leak in gmac_setup_txqs(), from Navid Emamdoost.

15) Fix double free in dpaa2-ptp code, from Ioana Ciornei.

16) Reject invalid MTU values in stmmac, from Jose Abreu.

17) Fix refcount leak in error path of u32 classifier, from Davide
    Caratti.

18) Fix regression causing iwlwifi firmware crashes on boot, from Anders
    Kaseorg.

19) Fix inverted return value logic in llc2 code, from Chan Shu Tak.

20) Disable hardware GRO when XDP is attached to qede, frm Manish
    Chopra.

21) Since we encode state in the low pointer bits, dst metrics must be
    at least 4 byte aligned, which is not necessarily true on m68k. Add
    annotations to fix this, from Geert Uytterhoeven.

* git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (160 commits)
  sfc: Include XDP packet headroom in buffer step size.
  sfc: fix channel allocation with brute force
  net: dst: Force 4-byte alignment of dst_metrics
  selftests: pmtu: fix init mtu value in description
  hv_netvsc: Fix unwanted rx_table reset
  net: phy: ensure that phy IDs are correctly typed
  mod_devicetable: fix PHY module format
  qede: Disable hardware gro when xdp prog is installed
  net: ena: fix issues in setting interrupt moderation params in ethtool
  net: ena: fix default tx interrupt moderation interval
  net/smc: unregister ib devices in reboot_event
  net: stmmac: platform: Fix MDIO init for platforms without PHY
  llc2: Fix return statement of llc_stat_ev_rx_null_dsap_xid_c (and _test_c)
  net: hisilicon: Fix a BUG trigered by wrong bytes_compl
  net: dsa: ksz: use common define for tag len
  s390/qeth: don't return -ENOTSUPP to userspace
  s390/qeth: fix promiscuous mode after reset
  s390/qeth: handle error due to unsupported transport mode
  cxgb4: fix refcount init for TC-MQPRIO offload
  tc-testing: initial tdc selftests for cls_u32
  ...

4 years agopipe: fix empty pipe check in pipe_write()
Jan Stancek [Sun, 22 Dec 2019 12:33:24 +0000 (13:33 +0100)]
pipe: fix empty pipe check in pipe_write()

LTP pipeio_1 test is hanging with v5.5-rc2-385-gb8e382a185eb,
with read side observing empty pipe and sleeping and write
side running out of space and then sleeping as well. In this
scenario there are 5 writers and 1 reader.

Problem is that after pipe_write() reacquires pipe lock, it
re-checks for empty pipe with potentially stale 'head' and
doesn't wake up read side anymore. pipe->tail can advance
beyond 'head', because there are multiple writers.

Use pipe->head for empty pipe check after reacquiring lock
to observe current state.

Testing: With patch, LTP pipeio_1 ran successfully in loop for 1 hour.
         Without patch it hanged within a minute.

Fixes: 1b6b26ae7053 ("pipe: fix and clarify pipe write wakeup logic")
Reported-by: Rachel Sibley <rasibley@redhat.com>
Signed-off-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoMerge tag 'kvm-ppc-fixes-5.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git...
Paolo Bonzini [Sun, 22 Dec 2019 12:18:15 +0000 (13:18 +0100)]
Merge tag 'kvm-ppc-fixes-5.5-1' of git://git./linux/kernel/git/paulus/powerpc into kvm-master

PPC KVM fix for 5.5

- Fix a bug where we try to do an ultracall on a system without an
  ultravisor.

4 years agoMAINTAINERS: remove Radim from KVM maintainers
Paolo Bonzini [Wed, 4 Dec 2019 14:33:35 +0000 (15:33 +0100)]
MAINTAINERS: remove Radim from KVM maintainers

Radim's kernel.org email is bouncing, which I take as a signal that
he is not really able to deal with KVM at this time.  Make MAINTAINERS
match the effective value of KVM's bus factor.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
4 years agoMAINTAINERS: Orphan KVM for MIPS
James Hogan [Sat, 21 Dec 2019 15:50:13 +0000 (15:50 +0000)]
MAINTAINERS: Orphan KVM for MIPS

I haven't been active for 18 months, and don't have the hardware set up
to test KVM for MIPS, so mark it as orphaned and remove myself as
maintainer. Hopefully somebody from MIPS can pick this up.

Signed-off-by: James Hogan <jhogan@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Paul Burton <paulburton@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: kvm@vger.kernel.org
Cc: linux-mips@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
4 years agoext4: clarify impact of 'commit' mount option
Jan Kara [Wed, 18 Dec 2019 11:12:10 +0000 (12:12 +0100)]
ext4: clarify impact of 'commit' mount option

The description of 'commit' mount option dates back to ext3 times.
Update the description to match current meaning for ext4.

Reported-by: Paul Richards <paul.richards@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20191218111210.14161-1-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
4 years agoext4: fix unused-but-set-variable warning in ext4_add_entry()
Yunfeng Ye [Tue, 17 Dec 2019 14:46:49 +0000 (22:46 +0800)]
ext4: fix unused-but-set-variable warning in ext4_add_entry()

Warning is found when compile with "-Wunused-but-set-variable":

fs/ext4/namei.c: In function ‘ext4_add_entry’:
fs/ext4/namei.c:2167:23: warning: variable ‘sbi’ set but not used
[-Wunused-but-set-variable]
  struct ext4_sb_info *sbi;
                       ^~~
Fix this by moving the variable @sbi under CONFIG_UNICODE.

Signed-off-by: Yunfeng Ye <yeyunfeng@huawei.com>
Reviewed-by: Ritesh Harjani <riteshh@linux.ibm.com>
Link: https://lore.kernel.org/r/cb5eb904-224a-9701-c38f-cb23514b1fff@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
4 years agoMerge tag 'trace-v5.5-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
Linus Torvalds [Sat, 21 Dec 2019 23:16:56 +0000 (15:16 -0800)]
Merge tag 'trace-v5.5-rc2' of git://git./linux/kernel/git/rostedt/linux-trace

Pull tracing fixes from Steven Rostedt:

 - Fix memory leak on error path of process_system_preds()

 - Lock inversion fix with updating tgid recording option

 - Fix histogram compare function on big endian machines

 - Fix histogram trigger function on big endian machines

 - Make trace_printk() irq sync on init for kprobe selftest correctness

* tag 'trace-v5.5-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing: Fix endianness bug in histogram trigger
  samples/trace_printk: Wait for IRQ work to finish
  tracing: Fix lock inversion in trace_event_enable_tgid_record()
  tracing: Have the histogram compare functions convert to u64 first
  tracing: Avoid memory leak in process_system_preds()

4 years agoMerge tag 'libnvdimm-fix-5.5-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sat, 21 Dec 2019 23:12:26 +0000 (15:12 -0800)]
Merge tag 'libnvdimm-fix-5.5-rc3' of git://git./linux/kernel/git/nvdimm/nvdimm

Pull libnvdimm fix from Dan Williams:
 "A minor regression fix.

  The libnvdimm unit tests were expecting to mock calls to
  ioremap_nocache() which disappeared in v5.5-rc1. This fix has appeared
  in -next and collided with some cleanups that Christoph has planned
  for v5.6, but he will fix up his branch once this goes in.

  Summary:

   - Restore the operation of the libnvdimm unit tests after the removal
     of ioremap_nocache()"

* tag 'libnvdimm-fix-5.5-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  tools/testing/nvdimm: Fix mock support for ioremap

4 years agotracing: Fix endianness bug in histogram trigger
Sven Schnelle [Wed, 18 Dec 2019 07:44:27 +0000 (08:44 +0100)]
tracing: Fix endianness bug in histogram trigger

At least on PA-RISC and s390 synthetic histogram triggers are failing
selftests because trace_event_raw_event_synth() always writes a 64 bit
values, but the reader expects a field->size sized value. On little endian
machines this doesn't hurt, but on big endian this makes the reader always
read zero values.

Link: http://lore.kernel.org/linux-trace-devel/20191218074427.96184-4-svens@linux.ibm.com
Cc: stable@vger.kernel.org
Fixes: 4b147936fa509 ("tracing: Add support for 'synthetic' events")
Acked-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agosamples/trace_printk: Wait for IRQ work to finish
Sven Schnelle [Wed, 18 Dec 2019 07:44:26 +0000 (08:44 +0100)]
samples/trace_printk: Wait for IRQ work to finish

trace_printk schedules work via irq_work_queue(), but doesn't
wait until it was processed. The kprobe_module.tc testcase does:

:;: "Load module again, which means the event1 should be recorded";:
modprobe trace-printk
grep "event1:" trace

so the grep which checks the trace file might run before the irq work
was processed. Fix this by adding a irq_work_sync().

Link: http://lore.kernel.org/linux-trace-devel/20191218074427.96184-3-svens@linux.ibm.com
Cc: stable@vger.kernel.org
Fixes: af2a0750f3749 ("selftests/ftrace: Improve kprobe on module testcase to load/unload module")
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Fix lock inversion in trace_event_enable_tgid_record()
Prateek Sood [Tue, 10 Dec 2019 09:15:16 +0000 (09:15 +0000)]
tracing: Fix lock inversion in trace_event_enable_tgid_record()

       Task T2                             Task T3
trace_options_core_write()            subsystem_open()

 mutex_lock(trace_types_lock)           mutex_lock(event_mutex)

 set_tracer_flag()

   trace_event_enable_tgid_record()       mutex_lock(trace_types_lock)

    mutex_lock(event_mutex)

This gives a circular dependency deadlock between trace_types_lock and
event_mutex. To fix this invert the usage of trace_types_lock and
event_mutex in trace_options_core_write(). This keeps the sequence of
lock usage consistent.

Link: http://lkml.kernel.org/r/0101016eef175e38-8ca71caf-a4eb-480d-a1e6-6f0bbc015495-000000@us-west-2.amazonses.com
Cc: stable@vger.kernel.org
Fixes: d914ba37d7145 ("tracing: Add support for recording tgid of tasks")
Signed-off-by: Prateek Sood <prsood@codeaurora.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agoMerge tag 's390-5.5-4' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Linus Torvalds [Sat, 21 Dec 2019 20:17:14 +0000 (12:17 -0800)]
Merge tag 's390-5.5-4' of git://git./linux/kernel/git/s390/linux

Pull s390 fixes from Vasily Gorbik:

 - Fix unwinding from irq context of interrupted user process.

 - Add purgatory build missing symbols check. That helped to uncover and
   fix missing symbols when built with kasan support enabled.

 - Couple of ftrace fixes. Avoid broken stack trace and fix recursion
   loop in function_graph tracer.

* tag 's390-5.5-4' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/ftrace: save traced function caller
  s390/unwind: stop gracefully at user mode pt_regs in irq stack
  s390/purgatory: do not build purgatory with kcov, kasan and friends
  s390/purgatory: Make sure we fail the build if purgatory has missing symbols
  s390/ftrace: fix endless recursion in function_graph tracer

4 years agoMerge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sat, 21 Dec 2019 18:52:10 +0000 (10:52 -0800)]
Merge branch 'sched-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull scheduler fixes from Ingo Molnar:
 "Misc fixes: a (rare) PSI crash fix, a CPU affinity related balancing
  fix, and a toning down of active migration attempts"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/cfs: fix spurious active migration
  sched/fair: Fix find_idlest_group() to handle CPU affinity
  psi: Fix a division error in psi poll()
  sched/psi: Fix sampling error and rare div0 crashes with cgroups and high uptime

4 years agoMerge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sat, 21 Dec 2019 18:51:00 +0000 (10:51 -0800)]
Merge branch 'perf-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull perf fixes from Ingo Molnar:
 "Misc fixes: a BTS fix, a PT NMI handling fix, a PMU sysfs fix and an
  SRCU annotation"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/core: Add SRCU annotation for pmus list walk
  perf/x86/intel: Fix PT PMI handling
  perf/x86/intel/bts: Fix the use of page_private()
  perf/x86: Fix potential out-of-bounds access

4 years agoMerge tag 'kbuild-fixes-v5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/masahi...
Linus Torvalds [Sat, 21 Dec 2019 18:49:47 +0000 (10:49 -0800)]
Merge tag 'kbuild-fixes-v5.5' of git://git./linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild fixes from Masahiro Yamada:

 - fix warning in out-of-tree 'make clean'

 - add READELF variable to the top Makefile

 - fix broken builds when LINUX_COMPILE_BY contains a backslash

 - fix build warning in kallsyms

 - fix NULL pointer access in expr_eq() in Kconfig

 - fix missing dependency on rsync in deb-pkg build

 - remove ---help--- from documentation

 - fix misleading documentation about directory descending

* tag 'kbuild-fixes-v5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  kbuild: clarify the difference between obj-y and obj-m w.r.t. descending
  kconfig: remove ---help--- from documentation
  scripts: package: mkdebian: add missing rsync dependency
  kconfig: don't crash on NULL expressions in expr_eq()
  scripts/kallsyms: fix offset overflow of kallsyms_relative_base
  mkcompile_h: use printf for LINUX_COMPILE_BY
  mkcompile_h: git rid of UTS_TRUNCATE from LINUX_COMPILE_{BY,HOST}
  x86/boot: kbuild: allow readelf executable to be specified
  kbuild: fix 'No such file or directory' warning when cleaning

4 years agokbuild: clarify the difference between obj-y and obj-m w.r.t. descending
Masahiro Yamada [Thu, 19 Dec 2019 11:51:00 +0000 (20:51 +0900)]
kbuild: clarify the difference between obj-y and obj-m w.r.t. descending

Kbuild descends into a directory by either 'y' or 'm', but there is an
important difference.

Kbuild combines the built-in objects into built-in.a in each directory.
The built-in.a in the directory visited by obj-y is merged into the
built-in.a in the parent directory. This merge happens recursively
when Kbuild is ascending back towards the top directory, then built-in
objects are linked into vmlinux eventually. This works properly only
when the Makefile specifying obj-y is reachable by the chain of obj-y.

On the other hand, Kbuild does not take built-in.a from the directory
visited by obj-m. This it, all the objects in that directory are
supposed to be modular. If Kbuild descends into a directory by obj-m,
but the Makefile in the sub-directory specifies obj-y, those objects
are just left orphan.

The current statement "Kbuild only uses this information to decide that
it needs to visit the directory" is misleading. Clarify the difference.

Reported-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Johan Hovold <johan@kernel.org>
4 years agoMerge branch 'parisc-5.5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller...
Linus Torvalds [Sat, 21 Dec 2019 14:49:41 +0000 (06:49 -0800)]
Merge branch 'parisc-5.5-2' of git://git./linux/kernel/git/deller/parisc-linux

Pul parisc fixes from Helge Deller:
 "Two build error fixes, one for the soft_offline_page() parameter
  change and one for a specific KEXEC/KEXEC_FILE configuration, as well
  as a compiler and a linker warning fix"

* 'parisc-5.5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: Fix compiler warnings in debug_core.c
  parisc: soft_offline_page() now takes the pfn
  parisc: add missing __init annotation
  parisc: fix compilation when KEXEC=n and KEXEC_FILE=y

4 years agoMerge tag 'for-linus-5.5b-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sat, 21 Dec 2019 14:24:56 +0000 (06:24 -0800)]
Merge tag 'for-linus-5.5b-rc3-tag' of git://git./linux/kernel/git/xen/tip

Pull xen fixes from Juergen Gross:
 "This contains two cleanup patches and a small series for supporting
  reloading the Xen block backend driver"

* tag 'for-linus-5.5b-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/grant-table: remove multiple BUG_ON on gnttab_interface
  xen-blkback: support dynamic unbind/bind
  xen/interface: re-define FRONT/BACK_RING_ATTACH()
  xenbus: limit when state is forced to closed
  xenbus: move xenbus_dev_shutdown() into frontend code...
  xen/blkfront: Adjust indentation in xlvbd_alloc_gendisk

4 years agoMerge tag 'powerpc-5.5-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
Linus Torvalds [Sat, 21 Dec 2019 14:17:05 +0000 (06:17 -0800)]
Merge tag 'powerpc-5.5-4' of git://git./linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 "Two weeks worth of accumulated fixes:

   - A fix for a performance regression seen on PowerVM LPARs using
     dedicated CPUs, caused by our vcpu_is_preempted() returning true
     even for idle CPUs.

   - One of the ultravisor support patches broke KVM on big endian hosts
     in v5.4.

   - Our KUAP (Kernel User Access Prevention) code missed allowing
     access in __clear_user(), which could lead to an oops or erroneous
     SEGV when triggered via PTRACE_GETREGSET.

   - Two fixes for the ocxl driver, an open/remove race, and a memory
     leak in an error path.

   - A handful of other small fixes.

  Thanks to: Andrew Donnellan, Christian Zigotzky, Christophe Leroy,
  Christoph Hellwig, Daniel Axtens, David Hildenbrand, Frederic Barrat,
  Gautham R. Shenoy, Greg Kurz, Ihor Pasichnyk, Juri Lelli, Marcus
  Comstedt, Mike Rapoport, Parth Shah, Srikar Dronamraju, Vaidyanathan
  Srinivasan"

* tag 'powerpc-5.5-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  KVM: PPC: Book3S HV: Fix regression on big endian hosts
  powerpc: Fix __clear_user() with KUAP enabled
  powerpc/pseries/cmm: fix managed page counts when migrating pages between zones
  powerpc/8xx: fix bogus __init on mmu_mapin_ram_chunk()
  ocxl: Fix potential memory leak on context creation
  powerpc/irq: fix stack overflow verification
  powerpc: Ensure that swiotlb buffer is allocated from low memory
  powerpc/shared: Use static key to detect shared processor
  powerpc/vcpu: Assume dedicated processors as non-preempt
  ocxl: Fix concurrent AFU open and device removal

4 years agoMerge branch 'ras-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sat, 21 Dec 2019 14:04:12 +0000 (06:04 -0800)]
Merge branch 'ras-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull x86 RAS fixes from Borislav Petkov:
 "Three urgent RAS fixes for the AMD side of things:

   - initialize struct mce.bank so that calculated error severity on AMD
     SMCA machines is correct

   - do not send IPIs early during bank initialization, when interrupts
     are disabled

   - a fix for when only a subset of MCA banks are enabled, which led to
     boot hangs on some new AMD CPUs"

* 'ras-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mce: Fix possibly incorrect severity calculation on AMD
  x86/MCE/AMD: Allow Reserved types to be overwritten in smca_banks[]
  x86/MCE/AMD: Do not use rdmsr_safe_on_cpu() in smca_configure()

4 years agoMerge tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sat, 21 Dec 2019 13:55:35 +0000 (05:55 -0800)]
Merge tag 'clk-fixes-for-linus' of git://git./linux/kernel/git/clk/linux

Pull clk fixes from Stephen Boyd:
 "One core framework fix to walk the orphan list and match up clks to
  parents when clk providers register the DT provider after registering
  all their clks (as they should).

  Then a handful of driver fixes for the qcom, imx, and at91 drivers.

  The driver fixes are relatively small fixes for incorrect register
  settings or missing locks causing race conditions"

* tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux:
  clk: qcom: Avoid SMMU/cx gdsc corner cases
  clk: qcom: gcc-sc7180: Fix setting flag for votable GDSCs
  clk: Move clk_core_reparent_orphans() under CONFIG_OF
  clk: at91: fix possible deadlock
  clk: walk orphan list on clock provider registration
  clk: imx: pll14xx: fix clk_pll14xx_wait_lock
  clk: imx: clk-imx7ulp: Add missing sentinel of ulp_div_table
  clk: imx: clk-composite-8m: add lock to gate/mux

4 years agoMerge branch 'sfc-fix-bugs-introduced-by-XDP-patches'
David S. Miller [Sat, 21 Dec 2019 05:56:48 +0000 (21:56 -0800)]
Merge branch 'sfc-fix-bugs-introduced-by-XDP-patches'

Edward Cree says:

====================
sfc: fix bugs introduced by XDP patches

Two fixes for bugs introduced by the XDP support in the sfc driver.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agosfc: Include XDP packet headroom in buffer step size.
Charles McLachlan [Fri, 20 Dec 2019 16:27:10 +0000 (16:27 +0000)]
sfc: Include XDP packet headroom in buffer step size.

Correct a mismatch between rx_page_buf_step and the actual step size
used when filling buffer pages.

This patch fixes the page overrun that occured when the MTU was set to
anything bigger than 1692.

Fixes: 3990a8fffbda ("sfc: allocate channels for XDP tx queues")
Signed-off-by: Charles McLachlan <cmclachlan@solarflare.com>
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agosfc: fix channel allocation with brute force
Edward Cree [Fri, 20 Dec 2019 16:26:40 +0000 (16:26 +0000)]
sfc: fix channel allocation with brute force

It was possible for channel allocation logic to get confused between what
 it had and what it wanted, and end up trying to use the same channel for
 both PTP and regular TX.  This led to a kernel panic:
    BUG: unable to handle page fault for address: 0000000000047635
    #PF: supervisor write access in kernel mode
    #PF: error_code(0x0002) - not-present page
    PGD 0 P4D 0
    Oops: 0002 [#1] SMP PTI
    CPU: 0 PID: 0 Comm: swapper/0 Tainted: G        W         5.4.0-rc3-ehc14+ #900
    Hardware name: Dell Inc. PowerEdge R710/0M233H, BIOS 6.4.0 07/23/2013
    RIP: 0010:native_queued_spin_lock_slowpath+0x188/0x1e0
    Code: f3 90 48 8b 32 48 85 f6 74 f6 eb e8 c1 ee 12 83 e0 03 83 ee 01 48 c1 e0 05 48 63 f6 48 05 c0 98 02 00 48 03 04 f5 a0 c6 ed 81 <48> 89 10 8b 42 08 85 c0 75 09 f3 90 8b 42 08 85 c0 74 f7 48 8b 32
    RSP: 0018:ffffc90000003d28 EFLAGS: 00010006
    RAX: 0000000000047635 RBX: 0000000000000246 RCX: 0000000000040000
    RDX: ffff888627a298c0 RSI: 0000000000003ffe RDI: ffff88861f6b8dd4
    RBP: ffff8886225c6e00 R08: 0000000000040000 R09: 0000000000000000
    R10: 0000000616f080c6 R11: 00000000000000c0 R12: ffff88861f6b8dd4
    R13: ffffc90000003dc8 R14: ffff88861942bf00 R15: ffff8886150f2000
    FS:  0000000000000000(0000) GS:ffff888627a00000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000000000047635 CR3: 000000000200a000 CR4: 00000000000006f0
    Call Trace:
     <IRQ>
     _raw_spin_lock_irqsave+0x22/0x30
     skb_queue_tail+0x1b/0x50
     sock_queue_err_skb+0x9d/0xf0
     __skb_complete_tx_timestamp+0x9d/0xc0
     efx_dequeue_buffer+0x126/0x180 [sfc]
     efx_xmit_done+0x73/0x1c0 [sfc]
     efx_ef10_ev_process+0x56a/0xfe0 [sfc]
     ? tick_sched_do_timer+0x60/0x60
     ? timerqueue_add+0x5d/0x70
     ? enqueue_hrtimer+0x39/0x90
     efx_poll+0x111/0x380 [sfc]
     ? rcu_accelerate_cbs+0x50/0x160
     net_rx_action+0x14a/0x400
     __do_softirq+0xdd/0x2d0
     irq_exit+0xa0/0xb0
     do_IRQ+0x53/0xe0
     common_interrupt+0xf/0xf
     </IRQ>

In the long run we intend to rewrite the channel allocation code, but for
 'net' fix this by allocating extra_channels, and giving them TX queues,
 even if we do not in fact need them (e.g. on NICs without MAC TX
 timestamping), and thereby using simpler logic to assign the channels
 once they're allocated.

Fixes: 3990a8fffbda ("sfc: allocate channels for XDP tx queues")
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agonet: dst: Force 4-byte alignment of dst_metrics
Geert Uytterhoeven [Fri, 20 Dec 2019 13:31:40 +0000 (14:31 +0100)]
net: dst: Force 4-byte alignment of dst_metrics

When storing a pointer to a dst_metrics structure in dst_entry._metrics,
two flags are added in the least significant bits of the pointer value.
Hence this assumes all pointers to dst_metrics structures have at least
4-byte alignment.

However, on m68k, the minimum alignment of 32-bit values is 2 bytes, not
4 bytes.  Hence in some kernel builds, dst_default_metrics may be only
2-byte aligned, leading to obscure boot warnings like:

    WARNING: CPU: 0 PID: 7 at lib/refcount.c:28 refcount_warn_saturate+0x44/0x9a
    refcount_t: underflow; use-after-free.
    Modules linked in:
    CPU: 0 PID: 7 Comm: ksoftirqd/0 Tainted: G        W         5.5.0-rc2-atari-01448-g114a1a1038af891d-dirty #261
    Stack from 10835e6c:
    10835e6c 0038134f 00023fa6 00394b0f 0000001c 00000009 00321560 00023fea
    00394b0f 0000001c 001a70f8 00000009 00000000 10835eb4 00000001 00000000
    04208040 0000000a 00394b4a 10835ed4 00043aa8 001a70f8 00394b0f 0000001c
    00000009 00394b4a 0026aba8 003215a4 00000003 00000000 0026d5a8 00000001
    003215a4 003a4361 003238d6 000001f0 00000000 003215a4 10aa3b00 00025e84
    003ddb00 10834000 002416a8 10aa3b00 00000000 00000080 000aa038 0004854a
    Call Trace: [<00023fa6>] __warn+0xb2/0xb4
     [<00023fea>] warn_slowpath_fmt+0x42/0x64
     [<001a70f8>] refcount_warn_saturate+0x44/0x9a
     [<00043aa8>] printk+0x0/0x18
     [<001a70f8>] refcount_warn_saturate+0x44/0x9a
     [<0026aba8>] refcount_sub_and_test.constprop.73+0x38/0x3e
     [<0026d5a8>] ipv4_dst_destroy+0x5e/0x7e
     [<00025e84>] __local_bh_enable_ip+0x0/0x8e
     [<002416a8>] dst_destroy+0x40/0xae

Fix this by forcing 4-byte alignment of all dst_metrics structures.

Fixes: e5fd387ad5b30ca3 ("ipv6: do not overwrite inetpeer metrics prematurely")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agoselftests: pmtu: fix init mtu value in description
Hangbin Liu [Fri, 20 Dec 2019 07:08:06 +0000 (15:08 +0800)]
selftests: pmtu: fix init mtu value in description

There is no a_r3, a_r4 in the testing topology.
It should be b_r1, b_r2. Also b_r1 mtu is 1400 and b_r2 mtu is 1500.

Fixes: e44e428f59e4 ("selftests: pmtu: add basic IPv4 and IPv6 PMTU tests")
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Acked-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agohv_netvsc: Fix unwanted rx_table reset
Haiyang Zhang [Fri, 20 Dec 2019 02:28:10 +0000 (18:28 -0800)]
hv_netvsc: Fix unwanted rx_table reset

In existing code, the receive indirection table, rx_table, is in
struct rndis_device, which will be reset when changing MTU, ringparam,
etc. User configured receive indirection table values will be lost.

To fix this, move rx_table to struct net_device_context, and check
netif_is_rxfh_configured(), so rx_table will be set to default only
if no user configured value.

Fixes: ff4a44199012 ("netvsc: allow get/set of RSS indirection table")
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agonet: phy: ensure that phy IDs are correctly typed
Russell King [Thu, 19 Dec 2019 23:24:52 +0000 (23:24 +0000)]
net: phy: ensure that phy IDs are correctly typed

PHY IDs are 32-bit unsigned quantities. Ensure that they are always
treated as such, and not passed around as "int"s.

Fixes: 13d0ab6750b2 ("net: phy: check return code when requesting PHY driver module")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agomod_devicetable: fix PHY module format
Russell King [Thu, 19 Dec 2019 23:24:47 +0000 (23:24 +0000)]
mod_devicetable: fix PHY module format

When a PHY is probed, if the top bit is set, we end up requesting a
module with the string "mdio:-10101110000000100101000101010001" -
the top bit is printed to a signed -1 value. This leads to the module
not being loaded.

Fix the module format string and the macro generating the values for
it to ensure that we only print unsigned types and the top bit is
always 0/1. We correctly end up with
"mdio:10101110000000100101000101010001".

Fixes: 8626d3b43280 ("phylib: Support phy module autoloading")
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agoqede: Disable hardware gro when xdp prog is installed
Manish Chopra [Thu, 19 Dec 2019 18:35:16 +0000 (10:35 -0800)]
qede: Disable hardware gro when xdp prog is installed

commit 18c602dee472 ("qede: Use NETIF_F_GRO_HW.") introduced
a regression in driver that when xdp program is installed on
qede device, device's aggregation feature (hardware GRO) is not
getting disabled, which is unexpected with xdp.

Fixes: 18c602dee472 ("qede: Use NETIF_F_GRO_HW.")
Signed-off-by: Manish Chopra <manishc@marvell.com>
Signed-off-by: Ariel Elior <aelior@marvell.com>
Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agoMerge branch 'ena-fixes-of-interrupt-moderation-bugs'
David S. Miller [Sat, 21 Dec 2019 05:43:09 +0000 (21:43 -0800)]
Merge branch 'ena-fixes-of-interrupt-moderation-bugs'

Arthur Kiyanovski says:

====================
ena: fixes of interrupt moderation bugs

Differences from V1:
1. Updated default tx interrupt moderation to 64us
2. Added "Fixes:" tags.
3. Removed cosmetic changes that are not relevant for these bug fixes

This patchset includes a couple of fixes of bugs in the implemenation of
interrupt moderation.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agonet: ena: fix issues in setting interrupt moderation params in ethtool
Arthur Kiyanovski [Thu, 19 Dec 2019 15:40:56 +0000 (17:40 +0200)]
net: ena: fix issues in setting interrupt moderation params in ethtool

Issue 1:
--------
Reproduction steps:
1. sudo ethtool -C eth0 rx-usecs 128
2. sudo ethtool -C eth0 adaptive-rx on
3. sudo ethtool -C eth0 adaptive-rx off
4. ethtool -c eth0

expected output: rx-usecs 128
actual output: rx-usecs 0

Reason for issue:
In stage 3, ethtool userspace calls first the ena_get_coalesce() handler
to get the current value of all properties, and then the ena_set_coalesce()
handler. When ena_get_coalesce() is called the adaptive interrupt
moderation is still on. There is an if in the code that returns the
rx_coalesce_usecs only if the adaptive interrupt moderation is off.
And since it is still on, rx_coalesce_usecs is not set, meaning it
stays 0.

Solution to issue:
Remove this if static interrupt moderation intervals have nothing to do
with dynamic ones.

Issue 2:
--------
Reproduction steps:
1. sudo ethtool -C eth0 adaptive-rx on
2. sudo ethtool -C eth0 rx-usecs 128
3. ethtool -c eth0

expected output: rx-usecs 128
actual output: rx-usecs 0

Reason for issue:
In stage 2, when ena_set_coalesce() is called, the handler tests if
rx adaptive interrupt moderation is on, and if it is, it returns before
getting to the part in the function that sets the rx non-adaptive
interrupt moderation interval.

Solution to issue:
Remove the return from the function when rx adaptive interrupt moderation
is on.

Also cleaned up the fixed code in ena_set_coalesce by grouping together
adaptive interrupt moderation toggling, and using && instead of nested
ifs.

Fixes: b3db86dc4b82 ("net: ena: reimplement set/get_coalesce()")
Fixes: 0eda847953d8 ("net: ena: fix retrieval of nonadaptive interrupt moderation intervals")
Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")
Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agonet: ena: fix default tx interrupt moderation interval
Arthur Kiyanovski [Thu, 19 Dec 2019 15:40:55 +0000 (17:40 +0200)]
net: ena: fix default tx interrupt moderation interval

Current default non-adaptive tx interrupt moderation interval is 196 us.
This value is too high and might cause the tx queue to fill up.

In this commit we set the default non-adaptive tx interrupt moderation
interval to 64 us in order to:
1. Reduce the probability of the queue filling-up (when compared to the
   current default value of 196 us).
2. Reduce unnecessary tx interrupt overhead (which happens if we set the
   default tx interval to 0).
   We determined experimentally that 64 us is an optimal value that
   reduces interrupt rate by more than 20% without affecting performance.

Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")
Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agonet/smc: unregister ib devices in reboot_event
Karsten Graul [Thu, 19 Dec 2019 11:51:13 +0000 (12:51 +0100)]
net/smc: unregister ib devices in reboot_event

In the reboot_event handler, unregister the ib devices and enable
the IB layer to release the devices before the reboot.

Fixes: a33a803cfe64 ("net/smc: guarantee removal of link groups in reboot")
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agonet: stmmac: platform: Fix MDIO init for platforms without PHY
Padmanabhan Rajanbabu [Thu, 19 Dec 2019 10:17:01 +0000 (15:47 +0530)]
net: stmmac: platform: Fix MDIO init for platforms without PHY

The current implementation of "stmmac_dt_phy" function initializes
the MDIO platform bus data, even in the absence of PHY. This fix
will skip MDIO initialization if there is no PHY present.

Fixes: 7437127 ("net: stmmac: Convert to phylink and remove phylib logic")
Acked-by: Jayati Sahu <jayati.sahu@samsung.com>
Signed-off-by: Sriram Dash <sriram.dash@samsung.com>
Signed-off-by: Padmanabhan Rajanbabu <p.rajanbabu@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agollc2: Fix return statement of llc_stat_ev_rx_null_dsap_xid_c (and _test_c)
Chan Shu Tak, Alex [Thu, 19 Dec 2019 06:16:18 +0000 (14:16 +0800)]
llc2: Fix return statement of llc_stat_ev_rx_null_dsap_xid_c (and _test_c)

When a frame with NULL DSAP is received, llc_station_rcv is called.
In turn, llc_stat_ev_rx_null_dsap_xid_c is called to check if it is a NULL
XID frame. The return statement of llc_stat_ev_rx_null_dsap_xid_c returns 1
when the incoming frame is not a NULL XID frame and 0 otherwise. Hence, a
NULL XID response is returned unexpectedly, e.g. when the incoming frame is
a NULL TEST command.

To fix the error, simply remove the conditional operator.

A similar error in llc_stat_ev_rx_null_dsap_test_c is also fixed.

Signed-off-by: Chan Shu Tak, Alex <alexchan@task.com.hk>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agonet: hisilicon: Fix a BUG trigered by wrong bytes_compl
Jiangfeng Xiao [Thu, 19 Dec 2019 02:08:07 +0000 (10:08 +0800)]
net: hisilicon: Fix a BUG trigered by wrong bytes_compl

When doing stress test, we get the following trace:
kernel BUG at lib/dynamic_queue_limits.c:26!
Internal error: Oops - BUG: 0 [#1] SMP ARM
Modules linked in: hip04_eth
CPU: 0 PID: 2003 Comm: tDblStackPcap0 Tainted: G           O L  4.4.197 #1
Hardware name: Hisilicon A15
task: c3637668 task.stack: de3bc000
PC is at dql_completed+0x18/0x154
LR is at hip04_tx_reclaim+0x110/0x174 [hip04_eth]
pc : [<c041abfc>]    lr : [<bf0003a8>]    psr: 800f0313
sp : de3bdc2c  ip : 00000000  fp : c020fb10
r10: 00000000  r9 : c39b4224  r8 : 00000001
r7 : 00000046  r6 : c39b4000  r5 : 0078f392  r4 : 0078f392
r3 : 00000047  r2 : 00000000  r1 : 00000046  r0 : df5d5c80
Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 32c5387d  Table: 1e189b80  DAC: 55555555
Process tDblStackPcap0 (pid: 2003, stack limit = 0xde3bc190)
Stack: (0xde3bdc2c to 0xde3be000)
[<c041abfc>] (dql_completed) from [<bf0003a8>] (hip04_tx_reclaim+0x110/0x174 [hip04_eth])
[<bf0003a8>] (hip04_tx_reclaim [hip04_eth]) from [<bf0012c0>] (hip04_rx_poll+0x20/0x388 [hip04_eth])
[<bf0012c0>] (hip04_rx_poll [hip04_eth]) from [<c04c8d9c>] (net_rx_action+0x120/0x374)
[<c04c8d9c>] (net_rx_action) from [<c021eaf4>] (__do_softirq+0x218/0x318)
[<c021eaf4>] (__do_softirq) from [<c021eea0>] (irq_exit+0x88/0xac)
[<c021eea0>] (irq_exit) from [<c0240130>] (msa_irq_exit+0x11c/0x1d4)
[<c0240130>] (msa_irq_exit) from [<c0267ba8>] (__handle_domain_irq+0x110/0x148)
[<c0267ba8>] (__handle_domain_irq) from [<c0201588>] (gic_handle_irq+0xd4/0x118)
[<c0201588>] (gic_handle_irq) from [<c0558360>] (__irq_svc+0x40/0x58)
Exception stack(0xde3bdde0 to 0xde3bde28)
dde0: 00000000 00008001 c3637668 00000000 00000000 a00f0213 dd3627a0 c0af6380
de00: c086d380 a00f0213 c0a22a50 de3bde6c 00000002 de3bde30 c0558138 c055813c
de20: 600f0213 ffffffff
[<c0558360>] (__irq_svc) from [<c055813c>] (_raw_spin_unlock_irqrestore+0x44/0x54)
Kernel panic - not syncing: Fatal exception in interrupt

Pre-modification code:
int hip04_mac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
{
[...]
[1] priv->tx_head = TX_NEXT(tx_head);
[2] count++;
[3] netdev_sent_queue(ndev, skb->len);
[...]
}
An rx interrupt occurs if hip04_mac_start_xmit just executes to the line 2,
tx_head has been updated, but corresponding 'skb->len' has not been
added to dql_queue.

And then
hip04_mac_interrupt->__napi_schedule->hip04_rx_poll->hip04_tx_reclaim

In hip04_tx_reclaim, because tx_head has been updated,
bytes_compl will plus an additional "skb-> len"
which has not been added to dql_queue. And then
trigger the BUG_ON(bytes_compl > num_queued - dql->num_completed).

To solve the problem described above, we put
"netdev_sent_queue(ndev, skb->len);"
before
"priv->tx_head = TX_NEXT(tx_head);"

Fixes: a41ea46a9a12 ("net: hisilicon: new hip04 ethernet driver")
Signed-off-by: Jiangfeng Xiao <xiaojiangfeng@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agonet: dsa: ksz: use common define for tag len
Michael Grzeschik [Wed, 18 Dec 2019 16:01:39 +0000 (17:01 +0100)]
net: dsa: ksz: use common define for tag len

Remove special taglen define KSZ8795_INGRESS_TAG_LEN
and use generic KSZ_INGRESS_TAG_LEN instead.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agoMerge branch 's390-fixes'
David S. Miller [Sat, 21 Dec 2019 05:00:28 +0000 (21:00 -0800)]
Merge branch 's390-fixes'

Julian Wiedmann says:

====================
s390/qeth: fixes 2019-12-18

please apply the following patch series to your net tree.
This brings two fixes for initialization / teardown issues, and one
ENOTSUPP cleanup.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agos390/qeth: don't return -ENOTSUPP to userspace
Julian Wiedmann [Wed, 18 Dec 2019 15:32:28 +0000 (16:32 +0100)]
s390/qeth: don't return -ENOTSUPP to userspace

ENOTSUPP is not uapi, use EOPNOTSUPP instead.

Fixes: d66cb37e9664 ("qeth: Add new priority queueing options")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agos390/qeth: fix promiscuous mode after reset
Julian Wiedmann [Wed, 18 Dec 2019 15:32:27 +0000 (16:32 +0100)]
s390/qeth: fix promiscuous mode after reset

When managing the promiscuous mode during an RX modeset, qeth caches the
current HW state to avoid repeated programming of the same state on each
modeset.

But while tearing down a device, we forget to clear the cached state. So
when the device is later set online again, the initial RX modeset
doesn't program the promiscuous mode since we believe it is already
enabled.
Fix this by clearing the cached state in the tear-down path.

Note that for the SBP variant of promiscuous mode, this accidentally
works right now because we unconditionally restore the SBP role while
re-initializing.

Fixes: 4a71df50047f ("qeth: new qeth device driver")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Alexandra Winter <wintera@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agos390/qeth: handle error due to unsupported transport mode
Julian Wiedmann [Wed, 18 Dec 2019 15:32:26 +0000 (16:32 +0100)]
s390/qeth: handle error due to unsupported transport mode

Along with z/VM NICs, there's additional device types that only support
a specific transport mode (eg. external-bridged IQD).
Identify the corresponding error code, and raise a fitting error message
so that the user knows to adjust their device configuration.

On top of that also fix the subsequent error path, so that the rejected
cmd doesn't need to wait for a timeout but gets cancelled straight away.

Fixes: 4a71df50047f ("qeth: new qeth device driver")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agosbitmap: only queue kyber's wait callback if not already active
David Jeffery [Tue, 17 Dec 2019 16:00:24 +0000 (11:00 -0500)]
sbitmap: only queue kyber's wait callback if not already active

Under heavy loads where the kyber I/O scheduler hits the token limits for
its scheduling domains, kyber can become stuck.  When active requests
complete, kyber may not be woken up leaving the I/O requests in kyber
stuck.

This stuck state is due to a race condition with kyber and the sbitmap
functions it uses to run a callback when enough requests have completed.
The running of a sbt_wait callback can race with the attempt to insert the
sbt_wait.  Since sbitmap_del_wait_queue removes the sbt_wait from the list
first then sets the sbq field to NULL, kyber can see the item as not on a
list but the call to sbitmap_add_wait_queue will see sbq as non-NULL. This
results in the sbt_wait being inserted onto the wait list but ws_active
doesn't get incremented.  So the sbitmap queue does not know there is a
waiter on a wait list.

Since sbitmap doesn't think there is a waiter, kyber may never be
informed that there are domain tokens available and the I/O never advances.
With the sbt_wait on a wait list, kyber believes it has an active waiter
so cannot insert a new waiter when reaching the domain's full state.

This race can be fixed by only adding the sbt_wait to the queue if the
sbq field is NULL.  If sbq is not NULL, there is already an action active
which will trigger the re-running of kyber.  Let it run and add the
sbt_wait to the wait list if still needing to wait.

Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: David Jeffery <djeffery@redhat.com>
Reported-by: John Pittman <jpittman@redhat.com>
Tested-by: John Pittman <jpittman@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agocxgb4: fix refcount init for TC-MQPRIO offload
Rahul Lakkireddy [Wed, 18 Dec 2019 03:49:29 +0000 (09:19 +0530)]
cxgb4: fix refcount init for TC-MQPRIO offload

Properly initialize refcount to 1 when hardware queue arrays for
TC-MQPRIO offload have been freshly allocated. Otherwise, following
warning is observed. Also fix up error path to only free hardware
queue arrays when refcount reaches 0.

[  130.075342] ------------[ cut here ]------------
[  130.075343] refcount_t: addition on 0; use-after-free.
[  130.075355] WARNING: CPU: 0 PID: 10870 at lib/refcount.c:25
refcount_warn_saturate+0xe1/0x100
[  130.075356] Modules linked in: sch_mqprio iptable_nat ib_iser
libiscsi scsi_transport_iscsi ib_ipoib rdma_ucm ib_umad iw_cxgb4 libcxgb
ib_uverbs x86_pkg_temp_thermal cxgb4 igb
[  130.075361] CPU: 0 PID: 10870 Comm: tc Kdump: loaded Not tainted
5.5.0-rc1+ #11
[  130.075362] Hardware name: Supermicro
X9SRE/X9SRE-3F/X9SRi/X9SRi-3F/X9SRE/X9SRE-3F/X9SRi/X9SRi-3F, BIOS 3.2
01/16/2015
[  130.075363] RIP: 0010:refcount_warn_saturate+0xe1/0x100
[  130.075364] Code: e8 14 41 c1 ff 0f 0b c3 80 3d 44 f4 10 01 00 0f 85
63 ff ff ff 48 c7 c7 38 9f 83 8c 31 c0 c6 05 2e f4 10 01 01 e8 ef 40 c1
ff <0f> 0b c3 48 c7 c7 10 9f 83 8c 31 c0 c6 05 17 f4 10 01 01 e8 d7 40
[  130.075365] RSP: 0018:ffffa48d00c0b768 EFLAGS: 00010286
[  130.075366] RAX: 0000000000000000 RBX: 0000000000000008 RCX:
0000000000000001
[  130.075366] RDX: 0000000000000001 RSI: 0000000000000096 RDI:
ffff8a2e9fa187d0
[  130.075367] RBP: ffff8a2e93890000 R08: 0000000000000398 R09:
000000000000003c
[  130.075367] R10: 00000000000142a0 R11: 0000000000000397 R12:
ffffa48d00c0b848
[  130.075368] R13: ffff8a2e94746498 R14: ffff8a2e966f7000 R15:
0000000000000031
[  130.075368] FS:  00007f689015f840(0000) GS:ffff8a2e9fa00000(0000)
knlGS:0000000000000000
[  130.075369] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  130.075369] CR2: 00000000006762a0 CR3: 00000007cf164005 CR4:
00000000001606f0
[  130.075370] Call Trace:
[  130.075377]  cxgb4_setup_tc_mqprio+0xbee/0xc30 [cxgb4]
[  130.075382]  ? cxgb4_ethofld_restart+0x50/0x50 [cxgb4]
[  130.075384]  ? pfifo_fast_init+0x7e/0xf0
[  130.075386]  mqprio_init+0x5f4/0x630 [sch_mqprio]
[  130.075389]  qdisc_create+0x1bf/0x4a0
[  130.075390]  tc_modify_qdisc+0x1ff/0x770
[  130.075392]  rtnetlink_rcv_msg+0x28b/0x350
[  130.075394]  ? rtnl_calcit.isra.32+0x110/0x110
[  130.075395]  netlink_rcv_skb+0xc6/0x100
[  130.075396]  netlink_unicast+0x1db/0x330
[  130.075397]  netlink_sendmsg+0x2f5/0x460
[  130.075399]  ? _copy_from_user+0x2e/0x60
[  130.075400]  sock_sendmsg+0x59/0x70
[  130.075401]  ____sys_sendmsg+0x1f0/0x230
[  130.075402]  ? copy_msghdr_from_user+0xd7/0x140
[  130.075403]  ___sys_sendmsg+0x77/0xb0
[  130.075404]  ? ___sys_recvmsg+0x84/0xb0
[  130.075406]  ? __handle_mm_fault+0x377/0xaf0
[  130.075407]  __sys_sendmsg+0x53/0xa0
[  130.075409]  do_syscall_64+0x44/0x130
[  130.075412]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  130.075413] RIP: 0033:0x7f688f13af10
[  130.075414] Code: c3 48 8b 05 82 6f 2c 00 f7 db 64 89 18 48 83 cb ff
eb dd 0f 1f 80 00 00 00 00 83 3d 8d d0 2c 00 00 75 10 b8 2e 00 00 00 0f
05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ae cc 00 00 48 89 04 24
[  130.075414] RSP: 002b:00007ffe6c7d9988 EFLAGS: 00000246 ORIG_RAX:
000000000000002e
[  130.075415] RAX: ffffffffffffffda RBX: 00000000006703a0 RCX:
00007f688f13af10
[  130.075415] RDX: 0000000000000000 RSI: 00007ffe6c7d99f0 RDI:
0000000000000003
[  130.075416] RBP: 000000005df38312 R08: 0000000000000002 R09:
0000000000008000
[  130.075416] R10: 00007ffe6c7d93e0 R11: 0000000000000246 R12:
0000000000000000
[  130.075417] R13: 00007ffe6c7e9c50 R14: 0000000000000001 R15:
000000000067c600
[  130.075418] ---[ end trace 8fbb3bf36a8671db ]---

v2:
- Move the refcount_set() closer to where the hardware queue arrays
  are being allocated.
- Fix up error path to only free hardware queue arrays when refcount
  reaches 0.

Fixes: 2d0cb84dd973 ("cxgb4: add ETHOFLD hardware queue support")
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agoMerge tag 'devicetree-fixes-for-5.5-2' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Fri, 20 Dec 2019 21:48:32 +0000 (13:48 -0800)]
Merge tag 'devicetree-fixes-for-5.5-2' of git://git./linux/kernel/git/robh/linux

Pull Devicetree fix from Rob Herring:
 "Add missing 'properties' keyword enclosing 'snps,tso' in snps,dwmac
  binding"

* tag 'devicetree-fixes-for-5.5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
  dt-bindings: Add missing 'properties' keyword enclosing 'snps,tso'

4 years agoMerge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Linus Torvalds [Fri, 20 Dec 2019 21:36:49 +0000 (13:36 -0800)]
Merge tag 'arm64-fixes' of git://git./linux/kernel/git/arm64/linux

Pull arm64 fixes from Catalin Marinas:

 - Leftover put_cpu() in the perf/smmuv3 error path.

 - Add Hisilicon TSV110 to spectre-v2 safe list

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: cpu_errata: Add Hisilicon TSV110 to spectre-v2 safe list
  perf/smmuv3: Remove the leftover put_cpu() in error path

4 years agoMerge tag 'drm-fixes-2019-12-21' of git://anongit.freedesktop.org/drm/drm
Linus Torvalds [Fri, 20 Dec 2019 21:33:50 +0000 (13:33 -0800)]
Merge tag 'drm-fixes-2019-12-21' of git://anongit.freedesktop.org/drm/drm

Pull drm fixes from Dave Airlie:
 "Probably the last one before Christmas, I'll see if there is much
  demand over next few weeks for more fixes, I expect it'll be quiet
  enough.

  This has one exynos fix, and a bunch of i915 core and i915 GVT fixes.

  Summary:

  exynos:
   - component delete fix

  i915:
   - Fix to drop an unused and harmful display W/A
   - Fix to define EHL power wells independent of ICL
   - Fix for priority inversion on bonded requests
   - Fix in mmio offset calculation of DSB instance
   - Fix memory leak from get_task_pid when banning clients
   - Fixes to avoid dereference of uninitialized ops in dma_fence
     tracing and keep reference to execbuf object until submitted.
   - vGPU state setting locking fix (Zhenyu)
   - Fix vGPU display dmabuf as read-only (Zhenyu)
   - Properly handle vGPU display dmabuf page pin when rendering (Tina)
   - Fix one guest boot warning to handle guc reset state (Fred)"

* tag 'drm-fixes-2019-12-21' of git://anongit.freedesktop.org/drm/drm:
  drm/exynos: gsc: add missed component_del
  drm/i915: Fix pid leak with banned clients
  drm/i915/gem: Keep request alive while attaching fences
  drm/i915: Fix WARN_ON condition for cursor plane ddb allocation
  drm/i915/gvt: Fix guest boot warning
  drm/i915/tgl: Drop Wa#1178
  drm/i915/ehl: Define EHL powerwells independently of ICL
  drm/i915: Set fence_work.ops before dma_fence_init
  drm/i915: Copy across scheduler behaviour flags across submit fences
  drm/i915/dsb: Fix in mmio offset calculation of DSB instance
  drm/i915/gvt: Pin vgpu dma address before using
  drm/i915/gvt: set guest display buffer as readonly
  drm/i915/gvt: use vgpu lock for active state setting

4 years agoMerge tag 'io_uring-5.5-20191220' of git://git.kernel.dk/linux-block
Linus Torvalds [Fri, 20 Dec 2019 21:30:49 +0000 (13:30 -0800)]
Merge tag 'io_uring-5.5-20191220' of git://git.kernel.dk/linux-block

Pull io_uring fixes from Jens Axboe:
 "Here's a set of fixes that should go into 5.5-rc3 for io_uring.

  This is bigger than I'd like it to be, mainly because we're fixing the
  case where an application reuses sqe data right after issue. This
  really must work, or it's confusing. With 5.5 we're flagging us as
  submit stable for the actual data, this must also be the case for
  SQEs.

  Honestly, I'd really like to add another series on top of this, since
  it cleans it up considerable and prevents any SQE reuse by design. I
  posted that here:

    https://lore.kernel.org/io-uring/20191220174742.7449-1-axboe@kernel.dk/T/#u

  and may still send it your way early next week once it's been looked
  at and had some more soak time (does pass all regression tests). With
  that series, we've unified the prep+issue handling, and only the prep
  phase even has access to the SQE.

  Anyway, outside of that, fixes in here for a few other issues that
  have been hit in testing or production"

* tag 'io_uring-5.5-20191220' of git://git.kernel.dk/linux-block:
  io_uring: io_wq_submit_work() should not touch req->rw
  io_uring: don't wait when under-submitting
  io_uring: warn about unhandled opcode
  io_uring: read opcode and user_data from SQE exactly once
  io_uring: make IORING_OP_TIMEOUT_REMOVE deferrable
  io_uring: make IORING_OP_CANCEL_ASYNC deferrable
  io_uring: make IORING_POLL_ADD and IORING_POLL_REMOVE deferrable
  io_uring: make HARDLINK imply LINK
  io_uring: any deferred command must have stable sqe data
  io_uring: remove 'sqe' parameter to the OP helpers that take it
  io_uring: fix pre-prepped issue with force_nonblock == true
  io-wq: re-add io_wq_current_is_worker()
  io_uring: fix sporadic -EFAULT from IORING_OP_RECVMSG
  io_uring: fix stale comment and a few typos

4 years agoMerge tag 'drm-intel-fixes-2019-12-19' of git://anongit.freedesktop.org/drm/drm-intel...
Dave Airlie [Fri, 20 Dec 2019 20:08:19 +0000 (06:08 +1000)]
Merge tag 'drm-intel-fixes-2019-12-19' of git://anongit.freedesktop.org/drm/drm-intel into drm-fixes

- Fix to drop an unused and harmful display W/A
- Fix to define EHL power wells independent of ICL
- Fix for priority inversion on bonded requests
- Fix in mmio offset calculation of DSB instance
- Fix memory leak from get_task_pid when banning clients
- Fixes to avoid dereference of uninitialized ops in dma_fence tracing
  and keep reference to execbuf object until submitted.

- Includes gvt-fixes-2019-12-18

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191219124635.GA16068@jlahtine-desk.ger.corp.intel.com
4 years agoMerge tag 'exynos-drm-fixes-for-v5.5-rc3' of git://git.kernel.org/pub/scm/linux/kerne...
Dave Airlie [Fri, 20 Dec 2019 20:06:51 +0000 (06:06 +1000)]
Merge tag 'exynos-drm-fixes-for-v5.5-rc3' of git://git./linux/kernel/git/daeinki/drm-exynos into drm-fixes

Just one bug fixup
. Make sure to unregister a component for Exynos gscaler driver
  when the driver is removed.

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Inki Dae <inki.dae@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1576714013-3788-1-git-send-email-inki.dae@samsung.com
4 years agoparisc: Fix compiler warnings in debug_core.c
Helge Deller [Fri, 20 Dec 2019 20:00:19 +0000 (21:00 +0100)]
parisc: Fix compiler warnings in debug_core.c

Fix this compiler warning:
kernel/debug/debug_core.c: In function ‘kgdb_cpu_enter’:
arch/parisc/include/asm/cmpxchg.h:48:3: warning: value computed is not used [-Wunused-value]
   48 |  ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
arch/parisc/include/asm/atomic.h:78:30: note: in expansion of macro ‘xchg’
   78 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
      |                              ^~~~
kernel/debug/debug_core.c:596:4: note: in expansion of macro ‘atomic_xchg’
  596 |    atomic_xchg(&kgdb_active, cpu);
      |    ^~~~~~~~~~~

Signed-off-by: Helge Deller <deller@gmx.de>
4 years agoblock: fix memleak when __blk_rq_map_user_iov() is failed
Yang Yingliang [Wed, 18 Dec 2019 08:44:04 +0000 (16:44 +0800)]
block: fix memleak when __blk_rq_map_user_iov() is failed

When I doing fuzzy test, get the memleak report:

BUG: memory leak
unreferenced object 0xffff88837af80000 (size 4096):
  comm "memleak", pid 3557, jiffies 4294817681 (age 112.499s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    20 00 00 00 10 01 00 00 00 00 00 00 01 00 00 00   ...............
  backtrace:
    [<000000001c894df8>] bio_alloc_bioset+0x393/0x590
    [<000000008b139a3c>] bio_copy_user_iov+0x300/0xcd0
    [<00000000a998bd8c>] blk_rq_map_user_iov+0x2f1/0x5f0
    [<000000005ceb7f05>] blk_rq_map_user+0xf2/0x160
    [<000000006454da92>] sg_common_write.isra.21+0x1094/0x1870
    [<00000000064bb208>] sg_write.part.25+0x5d9/0x950
    [<000000004fc670f6>] sg_write+0x5f/0x8c
    [<00000000b0d05c7b>] __vfs_write+0x7c/0x100
    [<000000008e177714>] vfs_write+0x1c3/0x500
    [<0000000087d23f34>] ksys_write+0xf9/0x200
    [<000000002c8dbc9d>] do_syscall_64+0x9f/0x4f0
    [<00000000678d8e9a>] entry_SYSCALL_64_after_hwframe+0x49/0xbe

If __blk_rq_map_user_iov() is failed in blk_rq_map_user_iov(),
the bio(s) which is allocated before this failing will leak. The
refcount of the bio(s) is init to 1 and increased to 2 by calling
bio_get(), but __blk_rq_unmap_user() only decrease it to 1, so
the bio cannot be freed. Fix it by calling blk_rq_unmap_user().

Reviewed-by: Bob Liu <bob.liu@oracle.com>
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agos390/dasd: fix typo in copyright statement
Stefan Haberland [Thu, 19 Dec 2019 08:43:52 +0000 (09:43 +0100)]
s390/dasd: fix typo in copyright statement

coypright -> copyright

Reported-by: Kate Stewart <kstewart@linuxfoundation.org>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agos390/dasd: fix memleak in path handling error case
Stefan Haberland [Thu, 19 Dec 2019 08:43:51 +0000 (09:43 +0100)]
s390/dasd: fix memleak in path handling error case

If for whatever reason the dasd_eckd_check_characteristics() function
exits after at least some paths have their configuration data
allocated those data is never freed again. In the error case the
device->private pointer is set to NULL and dasd_eckd_uncheck_device()
will exit without freeing the path data because of this NULL pointer.

Fix by calling dasd_eckd_clear_conf_data() for error cases.

Also use dasd_eckd_clear_conf_data() in dasd_eckd_uncheck_device()
to avoid code duplication.

Reported-by: Qian Cai <cai@lca.pw>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agos390/dasd/cio: Interpret ccw_device_get_mdc return value correctly
Jan Höppner [Thu, 19 Dec 2019 08:43:50 +0000 (09:43 +0100)]
s390/dasd/cio: Interpret ccw_device_get_mdc return value correctly

The max data count (mdc) is an unsigned 16-bit integer value as per AR
documentation and is received via ccw_device_get_mdc() for a specific
path mask from the CIO layer. The function itself also always returns a
positive mdc value or 0 in case mdc isn't supported or couldn't be
determined.

Though, the comment for this function describes a negative return value
to indicate failures.

As a result, the DASD device driver interprets the return value of
ccw_device_get_mdc() incorrectly. The error case is essentially a dead
code path.

To fix this behaviour, check explicitly for a return value of 0 and
change the comment for ccw_device_get_mdc() accordingly.

This fix merely enables the error code path in the DASD functions
get_fcx_max_data() and verify_fcx_max_data(). The actual functionality
stays the same and is still correct.

Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Acked-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agoblock: Fix a lockdep complaint triggered by request queue flushing
Bart Van Assche [Wed, 18 Dec 2019 00:24:35 +0000 (16:24 -0800)]
block: Fix a lockdep complaint triggered by request queue flushing

Avoid that running test nvme/012 from the blktests suite triggers the
following false positive lockdep complaint:

============================================
WARNING: possible recursive locking detected
5.0.0-rc3-xfstests-00015-g1236f7d60242 #841 Not tainted
--------------------------------------------
ksoftirqd/1/16 is trying to acquire lock:
000000000282032e (&(&fq->mq_flush_lock)->rlock){..-.}, at: flush_end_io+0x4e/0x1d0

but task is already holding lock:
00000000cbadcbc2 (&(&fq->mq_flush_lock)->rlock){..-.}, at: flush_end_io+0x4e/0x1d0

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&(&fq->mq_flush_lock)->rlock);
  lock(&(&fq->mq_flush_lock)->rlock);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

1 lock held by ksoftirqd/1/16:
 #0: 00000000cbadcbc2 (&(&fq->mq_flush_lock)->rlock){..-.}, at: flush_end_io+0x4e/0x1d0

stack backtrace:
CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.0.0-rc3-xfstests-00015-g1236f7d60242 #841
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 dump_stack+0x67/0x90
 __lock_acquire.cold.45+0x2b4/0x313
 lock_acquire+0x98/0x160
 _raw_spin_lock_irqsave+0x3b/0x80
 flush_end_io+0x4e/0x1d0
 blk_mq_complete_request+0x76/0x110
 nvmet_req_complete+0x15/0x110 [nvmet]
 nvmet_bio_done+0x27/0x50 [nvmet]
 blk_update_request+0xd7/0x2d0
 blk_mq_end_request+0x1a/0x100
 blk_flush_complete_seq+0xe5/0x350
 flush_end_io+0x12f/0x1d0
 blk_done_softirq+0x9f/0xd0
 __do_softirq+0xca/0x440
 run_ksoftirqd+0x24/0x50
 smpboot_thread_fn+0x113/0x1e0
 kthread+0x121/0x140
 ret_from_fork+0x3a/0x50

Cc: Christoph Hellwig <hch@infradead.org>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Hannes Reinecke <hare@suse.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agoblock: Fix the type of 'sts' in bsg_queue_rq()
Bart Van Assche [Wed, 18 Dec 2019 00:23:29 +0000 (16:23 -0800)]
block: Fix the type of 'sts' in bsg_queue_rq()

This patch fixes the following sparse warnings:

block/bsg-lib.c:269:19: warning: incorrect type in initializer (different base types)
block/bsg-lib.c:269:19:    expected int sts
block/bsg-lib.c:269:19:    got restricted blk_status_t [usertype]
block/bsg-lib.c:286:16: warning: incorrect type in return expression (different base types)
block/bsg-lib.c:286:16:    expected restricted blk_status_t
block/bsg-lib.c:286:16:    got int [assigned] sts

Cc: Martin Wilck <mwilck@suse.com>
Fixes: d46fe2cb2dce ("block: drop device references in bsg_queue_rq()")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agoparisc: soft_offline_page() now takes the pfn
Helge Deller [Fri, 20 Dec 2019 18:46:17 +0000 (19:46 +0100)]
parisc: soft_offline_page() now takes the pfn

Switch page deallocation table (pdt) driver to use pfn instead of a page
pointer in soft_offline_page().

Fixes: feec24a6139d ("mm, soft-offline: convert parameter to pfn")
Signed-off-by: Helge Deller <deller@gmx.de>