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pstore/blk is similar to pstore/ram, but uses a block device as the
storage rather than persistent ram.
The pstore/blk backend solves two common use-cases that used to preclude
using pstore/ram:
- not all devices have a battery that could be used to persist
regular RAM across power failures.
- most embedded intelligent equipment have no persistent ram, which
increases costs, instead preferring cheaper solutions, like block
devices.
pstore/blk provides separate configurations for the end user and for the
block drivers. User configuration determines how pstore/blk operates, such
as record sizes, max kmsg dump reasons, etc. These can be set by Kconfig
and/or module parameters, but module parameter have priority over Kconfig.
Driver configuration covers all the details about the target block device,
such as total size of the device and how to perform read/write operations.
These are provided by block drivers, calling pstore_register_blkdev(),
including an optional panic_write callback used to bypass regular IO
APIs in an effort to avoid potentially destabilized kernel code during
a panic.
Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com>
Link: https://lore.kernel.org/lkml/20200511233229.27745-3-keescook@chromium.org/
Co-developed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Implement a common set of APIs needed to support pstore storage zones,
based on how ramoops is designed. This will be used by pstore/blk with
the intention of migrating pstore/ram in the future.
Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com>
Link: https://lore.kernel.org/lkml/20200511233229.27745-2-keescook@chromium.org/
Co-developed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Currently, it is only possible to get kmsg dumps for panic and oops,
or just panic, via "no-dump-oops". With "max-reason" it is possible to
dump messages for other kmsg_dump events, for example emerg and shutdown.
Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Link: https://lore.kernel.org/lkml/20200515184434.8470-7-keescook@chromium.org/
Signed-off-by: Kees Cook <keescook@chromium.org>
Now that pstore_register() can correctly pass max_reason to the kmesg
dump facility, introduce a new "max_reason" module parameter and
"max-reason" Device Tree field.
The "dump_oops" module parameter and "dump-oops" Device
Tree field are now considered deprecated, but are now automatically
converted to their corresponding max_reason values when present, though
the new max_reason setting has precedence.
For struct ramoops_platform_data, the "dump_oops" member is entirely
replaced by a new "max_reason" member, with the only existing user
updated in place.
Additionally remove the "reason" filter logic from ramoops_pstore_write(),
as that is not specifically needed anymore, though technically
this is a change in behavior for any ramoops users also setting the
printk.always_kmsg_dump boot param, which will cause ramoops to behave as
if max_reason was set to KMSG_DUMP_MAX.
Co-developed-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Link: https://lore.kernel.org/lkml/20200515184434.8470-6-keescook@chromium.org/
Signed-off-by: Kees Cook <keescook@chromium.org>
Add a new member to struct pstore_info for passing information about
kmesg dump maximum reason. This allows a finer control of what kmesg
dumps are sent to pstore storage backends.
Those backends that do not explicitly set this field (keeping it equal to
0), get the default behavior: store only Oopses and Panics, or everything
if the printk.always_kmsg_dump boot param is set.
Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Link: https://lore.kernel.org/lkml/20200515184434.8470-5-keescook@chromium.org/
Co-developed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
The pstore subsystem already had a private version of this function.
With the coming addition of the pstore/zone driver, this needs to be
shared. As it really should live with printk, move it there instead.
Link: https://lore.kernel.org/lkml/20200515184434.8470-4-keescook@chromium.org/
Acked-by: Petr Mladek <pmladek@suse.com>
Acked-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Reviewed-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
kmsg_dump() allows to dump kmesg buffer for various system events: oops,
panic, reboot, etc. It provides an interface to register a callback
call for clients, and in that callback interface there is a field
"max_reason", but it was getting ignored when set to any "reason"
higher than KMSG_DUMP_OOPS unless "always_kmsg_dump" was passed as
kernel parameter.
Allow clients to actually control their "max_reason", and keep the
current behavior when "max_reason" is not set.
Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Link: https://lore.kernel.org/lkml/20200515184434.8470-3-keescook@chromium.org/
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
This changes the ftrace record merging code to be agnostic of
pstore/ram, as the first step to making it available as a generic
routine for other backends to use, such as pstore/zone.
Link: https://lore.kernel.org/lkml/20200510202436.63222-6-keescook@chromium.org/
Signed-off-by: Kees Cook <keescook@chromium.org>
In order to more cleanly pass around backend names, make the "name" member
const. This means the module param needs to be dynamic (technically, it
was before, so this actually cleans up a minor memory leak if a backend
was specified and then gets unloaded.)
Link: https://lore.kernel.org/lkml/20200510202436.63222-3-keescook@chromium.org/
Signed-off-by: Kees Cook <keescook@chromium.org>
The CON_ENABLED flag gets cleared during unregister_console(), so make
sure we already reset the console flags before calling register_console(),
otherwise unloading and reloading a pstore backend will not restart
console logging.
Signed-off-by: Kees Cook <keescook@chromium.org>
If a backend was unloaded without having first removed all its
associated records in pstorefs, subsequent removals would crash while
attempting to call into the now missing backend. Add automatic removal
from the tree in pstore_unregister(), so that no references to the
backend remain.
Reported-by: Luis Henriques <lhenriques@suse.com>
Link: https://lore.kernel.org/lkml/87o8yrmv69.fsf@suse.com
Link: https://lore.kernel.org/lkml/20200506152114.50375-11-keescook@chromium.org/
Signed-off-by: Kees Cook <keescook@chromium.org>
The pstore.update_ms value was being disabled during pstore_unregister(),
which would cause any prior value to go unnoticed on the next
pstore_register(). Instead, just let del_timer() stop the timer, which
was always sufficient. This additionally refactors the timer reset code
and allows the timer to be enabled if the module parameter is changed
away from the default.
Link: https://lore.kernel.org/lkml/20200506152114.50375-10-keescook@chromium.org/
Signed-off-by: Kees Cook <keescook@chromium.org>
Nothing was protecting changes to the pstorefs superblock. Add locking
and refactor away is_pstore_mounted(), instead using a helper to add a
way to safely lock the pstorefs root inode during filesystem changes.
Link: https://lore.kernel.org/lkml/20200506152114.50375-9-keescook@chromium.org/
Signed-off-by: Kees Cook <keescook@chromium.org>
Add touchscreen info for the Trekstor Yourbook C11B. It seems to
use the same touchscreen as the Primebook C11, so we only add a new DMI
match.
Cc: Otmar Meier <otmarjun.meier@nexgo.de>
Reported-and-tested-by: Otmar Meier <otmarjun.meier@nexgo.de>
Signed-off-by: Bernhard Übelacker <bernhardu@mailbox.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
For hardware blocked wireless switch we check two bits. Introduce
HPWMI_POWER_FW_OR_HW enum to increase readability and for easier
maintenance.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
First of all, unsigned long can overflow u32 value on 64-bit machine.
Second, simple_strtoul() doesn't check for overflow in the input.
Convert simple_strtoul() to kstrtou32() to eliminate above issues.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Refactor postcode_store() to follow standard patterns of error handling.
While at it, switch to use kstrtobool().
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Using space in module alias makes it harder to parse modules.alias.
Replace it by a star(*).
Reviewed-by: Peter Kästle <peter@piie.net>
Signed-off-by: Chih-Wei Huang <cwhuang@linux.org.tw>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Fix timeout issue on some Ice Lake servers, where mail box command is
timing out before the response,
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Overflowed requests in io_uring_cancel_files() should be shed only of
inflight and overflowed refs. All other left references are owned by
someone else.
If refcount_sub_and_test() fails, it will go further and put put extra
ref, don't do that. Also, don't need to do io_wq_cancel_work()
for overflowed reqs, they will be let go shortly anyway.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Offset timeouts wait not for sqe->off non-timeout CQEs, but rather
sqe->off + number of prior inflight requests. Wait exactly for
sqe->off non-timeout completions
Reported-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Separate flushing offset timeouts io_commit_cqring() by moving it into a
helper. Just a preparation, makes following patches clearer.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
VNIC protocol version is reported in big-endian format, but it
is not byteswapped before logging. Fix that, and remove version
comparison as only one protocol version exists at this time.
Signed-off-by: Thomas Falcon <tlfalcon@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
st21nfca_tm_send_atr_res() misses to call kfree_skb() in an error path.
Add the missed function call to fix it.
Fixes: 1892bf844e ("NFC: st21nfca: Adding P2P support to st21nfca in Initiator & Target mode")
Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
In commit 19e16d220f ("neigh: support smaller retrans_time settting")
we add more accurate control for ARP and NS. But for ARP I forgot to
update the latest guard in neigh_timer_handler(), then the next
retransmit would be reset to jiffies + HZ/2 if we set the retrans_time
less than 500ms. Fix it by setting the time_before() check to HZ/100.
IPv6 does not have this issue.
Reported-by: Jianwen Ji <jiji@redhat.com>
Fixes: 19e16d220f ("neigh: support smaller retrans_time settting")
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Merge tag 'mlx5-fixes-2020-05-28' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux
Saeed Mahameed says:
====================
mlx5 fixes 2020-05-28
This series introduces some fixes to mlx5 driver.
v1->v2:
- Fix bad sha1, Jakub.
- Added one more patch by Pablo.
net/mlx5e: replace EINVAL in mlx5e_flower_parse_meta()
Nothing major, the only patch worth mentioning is the suspend/resume crash
fix by adding the missing pci device handlers, the fix is very straight
forward and as Dexuan already expressed, the patch is important for Azure
users to avoid crash on VM hibernation, patch is marked for -stable v4.6
below.
Conflict note:
('net/mlx5e: Fix MLX5_TC_CT dependencies') has a trivial one line conflict
with current net-next, which can be resolved by simply using the line from
net-next.
Please pull and let me know if there is any problem.
For -stable v4.6
('net/mlx5: Fix crash upon suspend/resume')
For -stable v5.6
('net/mlx5e: replace EINVAL in mlx5e_flower_parse_meta()')
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
This time there is one fix for the error path in the mediatek cmdq driver
(used by their video driver) and a couple of devicetree fixes, mostly
for 32-bit ARM, and fairly harmless:
- On OMAP2 there were a few regressions in the ethernet drivers,
one of them leading to an external abort trap
- One Raspberry Pi version had a misconfigured LED
- Interrupts on Broadcom NSP were slightly misconfigured
- One i.MX6q board had issues with graphics mode setting
- On mmp3 there are some minor fixes that were submitted for
v5.8 with a cc:stable tag, so I ended up picking them up
here as well
- The Mediatek Video Codec needs to run at a higher frequency
than configured originally
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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Merge tag 'armsoc-fixes-v5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
Pull ARM SoC fixes from Arnd Bergmann:
"This time there is one fix for the error path in the mediatek cmdq
driver (used by their video driver) and a couple of devicetree fixes,
mostly for 32-bit ARM, and fairly harmless:
- On OMAP2 there were a few regressions in the ethernet drivers, one
of them leading to an external abort trap
- One Raspberry Pi version had a misconfigured LED
- Interrupts on Broadcom NSP were slightly misconfigured
- One i.MX6q board had issues with graphics mode setting
- On mmp3 there are some minor fixes that were submitted for v5.8
with a cc:stable tag, so I ended up picking them up here as well
- The Mediatek Video Codec needs to run at a higher frequency than
configured originally"
* tag 'armsoc-fixes-v5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc:
ARM: dts: mmp3: Drop usb-nop-xceiv from HSIC phy
ARM: dts: mmp3-dell-ariel: Fix the SPI devices
ARM: dts: mmp3: Use the MMP3 compatible string for /clocks
ARM: dts: bcm: HR2: Fix PPI interrupt types
ARM: dts: bcm2835-rpi-zero-w: Fix led polarity
ARM: dts/imx6q-bx50v3: Set display interface clock parents
soc: mediatek: cmdq: return send msg error code
arm64: dts: mt8173: fix vcodec-enc clock
ARM: dts: Fix wrong mdio clock for dm814x
ARM: dts: am437x: fix networking on boards with ksz9031 phy
ARM: dts: am57xx: fix networking on boards with ksz9031 phy
Alexei Starovoitov says:
====================
pull-request: bpf 2020-05-29
The following pull-request contains BPF updates for your *net* tree.
We've added 6 non-merge commits during the last 7 day(s) which contain
a total of 4 files changed, 55 insertions(+), 34 deletions(-).
The main changes are:
1) minor verifier fix for fmod_ret progs, from Alexei.
2) af_xdp overflow check, from Bjorn.
3) minor verifier fix for 32bit assignment, from John.
4) powerpc has non-overlapping addr space, from Petr.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
ColdFire is a big-endian cpu with a big-endian dspi hw module,
so, it uses native access, but memcpy breaks the endianness.
So, if i understand properly, by native copy we would mean
be(cpu)->be(dspi) or le(cpu)->le(dspi) accesses, so my fix
shouldn't break anything, but i couldn't test it on LS family,
so every test is really appreciated.
Fixes: 53fadb4d90 ("spi: spi-fsl-dspi: Simplify bytes_per_word gymnastics")
Signed-off-by: Angelo Dureghello <angelo.dureghello@timesys.com>
Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20200529195756.184677-1-angelo.dureghello@timesys.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Now let's rename __wbt_update_limits to wbt_update_limits after the
previous one is deleted.
Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
No one call this function after commit 2af2783f2e ("rq-qos: get rid of
redundant wbt_update_limits()"), so remove it.
Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
After blk_throtl_drain is removed, there is no caller of tg_drain_bios,
so remove it as well.
Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
After the commit 5addeae1be ("blk-cgroup: remove blkcg_drain_queue"),
there is no caller of blk_throtl_drain, so let's remove it.
Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Merge tag 'ceph-for-5.7-rc8' of git://github.com/ceph/ceph-client
Pull ceph fixes from Ilya Dryomov:
"Cache tiering and cap handling fixups, both marked for stable"
* tag 'ceph-for-5.7-rc8' of git://github.com/ceph/ceph-client:
ceph: flush release queue when handling caps for unknown inode
libceph: ignore pool overlay and cache logic on redirects
waiting for completion on cpu_running.
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 fix from Catalin Marinas:
"Ensure __cpu_up() returns an error if cpu_online() is false after
waiting for completion on cpu_running"
* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
arm64/kernel: Fix return value when cpu_online() fails in __cpu_up()
Pull parisc fix from Helge Deller:
"Fix a kernel panic at boot time for some HP-PARISC machines"
* 'parisc-5.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
parisc: Fix kernel panic in mem_init()
Including:
- Two compile test fixes for issues introduced during the
5.7-rc1 merge window.
- A fix for a reference count leak in an error path of
iommu_group_alloc().
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Merge tag 'iommu-fixes-v5.7-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu
Pull iommu fixes from Joerg Roedel:
- Two build fixes for issues introduced during the merge window
- A fix for a reference count leak in an error path of
iommu_group_alloc()
* tag 'iommu-fixes-v5.7-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
iommu: Fix reference count leak in iommu_group_alloc.
x86: Hide the archdata.iommu field behind generic IOMMU_API
ia64: Hide the archdata.iommu field behind generic IOMMU_API
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Merge tag 'block-5.7-2020-05-29' of git://git.kernel.dk/linux-block
Pull block fixes from Jens Axboe:
"Two small fixes:
- Revert a block change that mixed up the return values for non-mq
devices
- NVMe poll race fix"
* tag 'block-5.7-2020-05-29' of git://git.kernel.dk/linux-block:
Revert "block: end bio with BLK_STS_AGAIN in case of non-mq devs and REQ_NOWAIT"
nvme-pci: avoid race between nvme_reap_pending_cqes() and nvme_poll()
A few bug fixes:
- Incorrect error unwind in qib and pvrdma
- User triggerable NULL pointer crash in mlx5 with ODP prefetch
- syzkaller RCU race in uverbs
- Rare double free crash in ipoib
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma
Pull rdma fixes from Jason Gunthorpe:
"Nothing profound here, just a last set of long standing bug fixes:
- Incorrect error unwind in qib and pvrdma
- User triggerable NULL pointer crash in mlx5 with ODP prefetch
- syzkaller RCU race in uverbs
- Rare double free crash in ipoib"
* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma:
IB/ipoib: Fix double free of skb in case of multicast traffic in CM mode
RDMA/core: Fix double destruction of uobject
RDMA/pvrdma: Fix missing pci disable in pvrdma_pci_probe()
RDMA/mlx5: Fix NULL pointer dereference in destroy_prefetch_work
IB/qib: Call kobject_put() when kobject_init_and_add() fails
Added a verifier test for assigning 32bit reg states to
64bit where 32bit reg holds a constant value of 0.
Without previous kernel verifier.c fix, the test in
this patch will fail.
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/159077335867.6014.2075350327073125374.stgit@john-Precision-5820-Tower
