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Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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The cred_guard_mutex is problematic as it is held over possibly
indefinite waits for userspace. The possible indefinite waits for
userspace that I have identified are: The cred_guard_mutex is held in
PTRACE_EVENT_EXIT waiting for the tracer. The cred_guard_mutex is
held over "put_user(0, tsk->clear_child_tid)" in exit_mm(). The
cred_guard_mutex is held over "get_user(futex_offset, ...") in
exit_robust_list. The cred_guard_mutex held over copy_strings.
The functions get_user and put_user can trigger a page fault which can
potentially wait indefinitely in the case of userfaultfd or if
userspace implements part of the page fault path.
In any of those cases the userspace process that the kernel is waiting
for might make a different system call that winds up taking the
cred_guard_mutex and result in deadlock.
Holding a mutex over any of those possibly indefinite waits for
userspace does not appear necessary. Add exec_update_mutex that will
just cover updating the process during exec where the permissions and
the objects pointed to by the task struct may be out of sync.
The plan is to switch the users of cred_guard_mutex to
exec_update_mutex one by one. This lets us move forward while still
being careful and not introducing any regressions.
Link: https://lore.kernel.org/lkml/20160921152946.GA24210@dhcp22.suse.cz/
Link: https://lore.kernel.org/lkml/AM6PR03MB5170B06F3A2B75EFB98D071AE4E60@AM6PR03MB5170.eurprd03.prod.outlook.com/
Link: https://lore.kernel.org/linux-fsdevel/20161102181806.GB1112@redhat.com/
Link: https://lore.kernel.org/lkml/20160923095031.GA14923@redhat.com/
Link: https://lore.kernel.org/lkml/20170213141452.GA30203@redhat.com/
Ref: 45c1a159b85b ("Add PTRACE_O_TRACEVFORKDONE and PTRACE_O_TRACEEXIT facilities.")
Ref: 456f17cd1a28 ("[PATCH] user-vm-unlock-2.5.31-A2")
Reviewed-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
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Column "time_in_queue" in diskstats is supposed to show total waiting time
of all requests. I.e. value should be equal to the sum of times from other
columns. But this is not true, because column "time_in_queue" is counted
separately in jiffies rather than in nanoseconds as other times.
This patch removes redundant counter for "time_in_queue" and shows total
time of read, write, discard and flush requests.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Reading /proc/diskstats iterates over all cpus for summing each field.
It's faster to sum all fields in one pass.
Hammering /proc/diskstats with fio shows 2x performance improvement:
fio --name=test --numjobs=$JOBS --filename=/proc/diskstats \
--size=1k --bs=1k --fallocate=none --create_on_open=1 \
--time_based=1 --runtime=10 --invalidate=0 --group_report
JOBS=1 JOBS=10
Before: 7k iops 64k iops
After: 18k iops 120k iops
Also this way code is more compact:
add/remove: 1/0 grow/shrink: 0/2 up/down: 194/-1540 (-1346)
Function old new delta
part_stat_read_all - 194 +194
diskstats_show 1344 631 -713
part_stat_show 1219 392 -827
Total: Before=14966947, After=14965601, chg -0.01%
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Currently io_ticks is approximated by adding one at each start and end of
requests if jiffies counter has changed. This works perfectly for requests
shorter than a jiffy or if one of requests starts/ends at each jiffy.
If disk executes just one request at a time and they are longer than two
jiffies then only first and last jiffies will be accounted.
Fix is simple: at the end of request add up into io_ticks jiffies passed
since last update rather than just one jiffy.
Example: common HDD executes random read 4k requests around 12ms.
fio --name=test --filename=/dev/sdb --rw=randread --direct=1 --runtime=30 &
iostat -x 10 sdb
Note changes of iostat's "%util" 8,43% -> 99,99% before/after patch:
Before:
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sdb 0,00 0,00 82,60 0,00 330,40 0,00 8,00 0,96 12,09 12,09 0,00 1,02 8,43
After:
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sdb 0,00 0,00 82,50 0,00 330,00 0,00 8,00 1,00 12,10 12,10 0,00 12,12 99,99
Now io_ticks does not loose time between start and end of requests, but
for queue-depth > 1 some I/O time between adjacent starts might be lost.
For load estimation "%util" is not as useful as average queue length,
but it clearly shows how often disk queue is completely empty.
Fixes: 5b18b5a73760 ("block: delete part_round_stats and switch to less precise counting")
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Conflicts:
arch/x86/events/intel/uncore.c
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux into arm/drivers
i.MX drivers update for 5.7:
- Update SCU power domain driver to include PD ranges for audio, CM40
I2C and INTMUX, also enlarge PD range for mu_b.
- Remove IMX_SC_RPC_SVC_ABORT from SCU API, as it was added by mistake.
- Increase build test coverage for i.MX8M SoC and IMX_SCU driver.
- Improve i.MX GPC power up sequencing to ensure that the reset is
properly propagated through the peripheral devices in the power
domain.
* tag 'imx-drivers-5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux:
soc: imx: drop COMPILE_TEST for IMX_SCU_SOC
firmware: imx: add COMPILE_TEST for IMX_SCU driver
soc: imx: gpc: fix power up sequencing
soc: imx: increase build coverage for imx8m soc driver
firmware: imx: scu-pd: add power domain for I2C and INTMUX in CM40 SS
firmware: imx: Remove IMX_SC_RPC_SVC_ABORT
firmware: imx: scu-pd: enlarge PD range for mu_b
firmware: imx: scu-pd: Add missing audio PD ranges
soc: imx: gpcv2: include linux/sizes.h
Link: https://lore.kernel.org/r/20200318051918.32579-1-shawnguo@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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git://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux into arm/drivers
Qualcomm driver updates for v5.7
This adds a new library for subscribing to notifications about
protection domains being stated and stopped and the integration of this
with the APR driver. It also contains fixes and cleanups for AOSS
driver, socinfo and rpmh.
* tag 'qcom-drivers-for-5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux:
soc: qcom: Fix QCOM_APR dependencies
soc: qcom: pdr: Avoid uninitialized use of found in pdr_indication_cb
soc: qcom: apr: Add avs/audio tracking functionality
dt-bindings: soc: qcom: apr: Add protection domain bindings
soc: qcom: Introduce Protection Domain Restart helpers
devicetree: bindings: firmware: add ipq806x to qcom_scm
soc: qcom: socinfo: Use seq_putc() if possible
drivers: qcom: rpmh-rsc: Use rcuidle tracepoints for rpmh
soc: qcom: Do not depend on ARCH_QCOM for QMI helpers
soc: qcom: aoss: Read back before triggering the IRQ
soc: qcom: aoss: Use wake_up_all() instead of wake_up_interruptible_all()
drivers: qcom: rpmh: remove rpmh_flush export
drivers: qcom: rpmh: fix macro to accept NULL argument
Link: https://lore.kernel.org/r/20200318044236.GD470201@yoga
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-amlogic into arm/drivers
soc: drivers: Amlogic updates for v5.7
- Add secure power domain controller
* tag 'amlogic-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-amlogic:
dt-bindings: power: Fix dt_binding_check error
soc: amlogic: fix compile failure with MESON_SECURE_PM_DOMAINS & !MESON_SM
soc: amlogic: Add support for Secure power domains controller
dt-bindings: power: add Amlogic secure power domains bindings
firmware: meson_sm: Add secure power domain support
Link: https://lore.kernel.org/r/7hpndcugoo.fsf@baylibre.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into arm/drivers
Driver changes for ti-sysc for v5.7 merge window
Driver changes for ti-sysc interconnect target module driver mostly
to be able to probe display subsystem (DSS) without platform data:
- Rename clk_enable/disable quirks to less confusing pre and post
reset quirks
- Enable module reset to work with modules with no sysconfig register
- Also consider non-existing module register when matching quirks
- Don't warn with nested ti-sysc devices
- Implement basic SoC revision handling
- Detect DSS related devices
- Implement DSS reset quirks
Note that there is also a DSS driver specific probe fix to allow
probing devices configured for interconnect target module data that
was agreed to be merged along with the ti-sysc driver changes.
And then there also changes to handle RTC, EDMA and PRUSS:
- Add module unlock quirk for RTC
- Detect EDMA modules
- Add support for handling PRUSS
* tag 'omap-for-v5.7/ti-sysc-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
bus: ti-sysc: Add support for PRUSS SYSC type
dt-bindings: bus: ti-sysc: Add support for PRUSS SYSC type
bus: ti-sysc: Detect EDMA and set quirk flags for tptc
bus: ti-sysc: Fix wrong offset for display subsystem reset quirk
bus: ti-sysc: Implement display subsystem reset quirk
bus: ti-sysc: Detect display subsystem related devices
bus: ti-sysc: Handle module unlock quirk needed for some RTC
bus: ti-sysc: Implement SoC revision handling
bus: ti-sysc: Don't warn about legacy property for nested ti-sysc devices
bus: ti-sysc: Consider non-existing registers too when matching quirks
bus: ti-sysc: Improve reset to work with modules with no sysconfig
bus: ti-sysc: Rename clk related quirks to pre_reset and post_reset quirks
bus: ti-sysc: Fix 1-wire reset quirk
drm/omap: Prepare DSS for probing without legacy platform data
Link: https://lore.kernel.org/r/pull-1583511417-919838@atomide.com-3
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/extcon into char-misc-next
Chanwoo writes:
Update extcon for 5.7
Detailed description for this pull request:
1. Update the extcon provider driver as following:
- Add wakeup support for extcon-axp288.c
- Clean-up code of -EPROBE_DEFER error case for extcon-palmas.c
- Covert extcon-usbc-cros-ec.txt to yaml format
2. Export symbol of extcon_get_edev_name()
* tag 'extcon-next-for-5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/extcon:
extcon: axp288: Add wakeup support
extcon: Mark extcon_get_edev_name() function as exported symbol
extcon: palmas: Hide error messages if gpio returns -EPROBE_DEFER
dt-bindings: extcon: usbc-cros-ec: convert extcon-usbc-cros-ec.txt to yaml format
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Use separate functions for the device core to bring a CPU up and down.
Users outside the device core must use add/remove_cpu() which will take
care of extra housekeeping work like keeping sysfs in sync.
Make cpu_up/down() static and replace the extra layer of indirection.
[ tglx: Removed the extra wrapper functions and adjusted function names ]
Signed-off-by: Qais Yousef <qais.yousef@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200323135110.30522-18-qais.yousef@arm.com
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This is the last direct user of cpu_up() before it can become an internal
implementation detail of the cpu subsystem.
Signed-off-by: Qais Yousef <qais.yousef@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200323135110.30522-17-qais.yousef@arm.com
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arm64 uses cpu_up() in the resume from hibernation code to ensure that the
CPU on which the system hibernated is online. Provide a core function for
this.
[ tglx: Split out from the combo arm64 patch ]
Signed-off-by: Qais Yousef <qais.yousef@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lkml.kernel.org/r/20200323135110.30522-9-qais.yousef@arm.com
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This function will be used later in machine_shutdown() for some
architectures.
disable_nonboot_cpus() is not safe to use when doing machine_down(),
because it relies on freeze_secondary_cpus() which in turn is a
suspend/resume related freeze and could abort if the logic detects any
pending activities that can prevent finishing the offlining process.
Signed-off-by: Qais Yousef <qais.yousef@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200323135110.30522-3-qais.yousef@arm.com
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The new functions use device_{online,offline}() which are userspace safe.
This is in preparation to move cpu_{up, down} kernel users to use a safer
interface that is not racy with userspace.
Suggested-by: "Paul E. McKenney" <paulmck@kernel.org>
Signed-off-by: Qais Yousef <qais.yousef@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Link: https://lkml.kernel.org/r/20200323135110.30522-2-qais.yousef@arm.com
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* for-next/kernel-ptrauth:
: Return address signing - in-kernel support
arm64: Kconfig: verify binutils support for ARM64_PTR_AUTH
lkdtm: arm64: test kernel pointer authentication
arm64: compile the kernel with ptrauth return address signing
kconfig: Add support for 'as-option'
arm64: suspend: restore the kernel ptrauth keys
arm64: __show_regs: strip PAC from lr in printk
arm64: unwind: strip PAC from kernel addresses
arm64: mask PAC bits of __builtin_return_address
arm64: initialize ptrauth keys for kernel booting task
arm64: initialize and switch ptrauth kernel keys
arm64: enable ptrauth earlier
arm64: cpufeature: handle conflicts based on capability
arm64: cpufeature: Move cpu capability helpers inside C file
arm64: ptrauth: Add bootup/runtime flags for __cpu_setup
arm64: install user ptrauth keys at kernel exit time
arm64: rename ptrauth key structures to be user-specific
arm64: cpufeature: add pointer auth meta-capabilities
arm64: cpufeature: Fix meta-capability cpufeature check
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'for-next/amu', 'for-next/final-cap-helper', 'for-next/cpu_ops-cleanup', 'for-next/misc' and 'for-next/perf' into for-next/core
* for-next/memory-hotremove:
: Memory hot-remove support for arm64
arm64/mm: Enable memory hot remove
arm64/mm: Hold memory hotplug lock while walking for kernel page table dump
* for-next/arm_sdei:
: SDEI: fix double locking on return from hibernate and clean-up
firmware: arm_sdei: clean up sdei_event_create()
firmware: arm_sdei: Use cpus_read_lock() to avoid races with cpuhp
firmware: arm_sdei: fix possible double-lock on hibernate error path
firmware: arm_sdei: fix double-lock on hibernate with shared events
* for-next/amu:
: ARMv8.4 Activity Monitors support
clocksource/drivers/arm_arch_timer: validate arch_timer_rate
arm64: use activity monitors for frequency invariance
cpufreq: add function to get the hardware max frequency
Documentation: arm64: document support for the AMU extension
arm64/kvm: disable access to AMU registers from kvm guests
arm64: trap to EL1 accesses to AMU counters from EL0
arm64: add support for the AMU extension v1
* for-next/final-cap-helper:
: Introduce cpus_have_final_cap_helper(), migrate arm64 KVM to it
arm64: kvm: hyp: use cpus_have_final_cap()
arm64: cpufeature: add cpus_have_final_cap()
* for-next/cpu_ops-cleanup:
: cpu_ops[] access code clean-up
arm64: Introduce get_cpu_ops() helper function
arm64: Rename cpu_read_ops() to init_cpu_ops()
arm64: Declare ACPI parking protocol CPU operation if needed
* for-next/misc:
: Various fixes and clean-ups
arm64: define __alloc_zeroed_user_highpage
arm64/kernel: Simplify __cpu_up() by bailing out early
arm64: remove redundant blank for '=' operator
arm64: kexec_file: Fixed code style.
arm64: add blank after 'if'
arm64: fix spelling mistake "ca not" -> "cannot"
arm64: entry: unmask IRQ in el0_sp()
arm64: efi: add efi-entry.o to targets instead of extra-$(CONFIG_EFI)
arm64: csum: Optimise IPv6 header checksum
arch/arm64: fix typo in a comment
arm64: remove gratuitious/stray .ltorg stanzas
arm64: Update comment for ASID() macro
arm64: mm: convert cpu_do_switch_mm() to C
arm64: fix NUMA Kconfig typos
* for-next/perf:
: arm64 perf updates
arm64: perf: Add support for ARMv8.5-PMU 64-bit counters
KVM: arm64: limit PMU version to PMUv3 for ARMv8.1
arm64: cpufeature: Extract capped perfmon fields
arm64: perf: Clean up enable/disable calls
perf: arm-ccn: Use scnprintf() for robustness
arm64: perf: Support new DT compatibles
arm64: perf: Refactor PMU init callbacks
perf: arm_spe: Remove unnecessary zero check on 'nr_pages'
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The code in the Corgi backlight driver can be considerably
simplified by moving to GPIO descriptors and lookup tables
from the board files instead of passing GPIO numbers using
the old API.
Make sure to encode inversion semantics for the Akita and
Spitz platforms inside the GPIO lookup table and drop the
custom inversion semantics from the driver.
All in-tree users are converted in this patch.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Dirent events are going to be supported in two flavors:
1. Directory fid info + mask that includes the specific event types
(e.g. FAN_CREATE) and an optional FAN_ONDIR flag.
2. Directory fid info + name + mask that includes only FAN_DIR_MODIFY.
To request the second event flavor, user needs to set the event type
FAN_DIR_MODIFY in the mark mask.
The first flavor is supported since kernel v5.1 for groups initialized
with flag FAN_REPORT_FID. It is intended to be used for watching
directories in "batch mode" - the watcher is notified when directory is
changed and re-scans the directory content in response. This event
flavor is stored more compactly in the event queue, so it is optimal
for workloads with frequent directory changes.
The second event flavor is intended to be used for watching large
directories, where the cost of re-scan of the directory on every change
is considered too high. The watcher getting the event with the directory
fid and entry name is expected to call fstatat(2) to query the content of
the entry after the change.
Legacy inotify events are reported with name and event mask (e.g. "foo",
FAN_CREATE | FAN_ONDIR). That can lead users to the conclusion that
there is *currently* an entry "foo" that is a sub-directory, when in fact
"foo" may be negative or non-dir by the time user gets the event.
To make it clear that the current state of the named entry is unknown,
when reporting an event with name info, fanotify obfuscates the specific
event types (e.g. create,delete,rename) and uses a common event type -
FAN_DIR_MODIFY to describe the change. This should make it harder for
users to make wrong assumptions and write buggy filesystem monitors.
At this point, name info reporting is not yet implemented, so trying to
set FAN_DIR_MODIFY in mark mask will return -EINVAL.
Link: https://lore.kernel.org/r/20200319151022.31456-12-amir73il@gmail.com
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
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The he_sr_control field is just a u8, so le32_to_cpu()
shouldn't be applied to it; this was evidently copied
from ieee80211_he_oper_size(). Fix it, and also adjust
the type of the local variable.
Fixes: ef11a931bd1c ("mac80211: HE: add Spatial Reuse element parsing support")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Link: https://lore.kernel.org/r/20200325090918.dfe483b49e06.Ia53622f23b2610a2ae6ea39a199866196fe946c1@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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Some gpio controllers ignores pin value writing when that pin is
configured as input mode. As a result, bgpio_dir_out should set
pin to output before configuring pin values or gpio pin values
can't be set up properly.
Introduce two variants of bgpio_dir_out: bgpio_dir_out_val_first
and bgpio_dir_out_dir_first, and assign direction_output according
to a new flag: BGPIOF_NO_SET_ON_INPUT.
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
Tested-by: René van Dorst <opensource@vdorst.com>
Reviewed-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
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Mark "void *data" as literal, in order to avoid those doc warnings:
./include/linux/devfreq.h:156: WARNING: Inline emphasis start-string without end-string.
./include/linux/devfreq.h:259: WARNING: Inline emphasis start-string without end-string.
./include/linux/devfreq.h:279: WARNING: Inline emphasis start-string without end-string.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
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Remove unneeded extern keyword from devfreq-related header file
and adjust the indentation of function parameter to keep the
consistency in header file
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
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Not only did this wheel did not need reinventing, but there is also
an issue with it: It doesn't remove the VLAN header in a way that
preserves the L2 payload checksum when that is being provided by the DSA
master hw. It should recalculate checksum both for the push, before
removing the header, and for the pull afterwards. But the current
implementation is quite dizzying, with pulls followed immediately
afterwards by pushes, the memmove is done before the push, etc. This
makes a DSA master with RX checksumming offload to print stack traces
with the infamous 'hw csum failure' message.
So remove the dsa_8021q_remove_header function and replace it with
something that actually works with inet checksumming.
Fixes: d461933638ae ("net: dsa: tag_8021q: Create helper function for removing VLAN header")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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extcon_get_edev_name() function provides client driver to request
extcon dev's name. If extcon driver and client driver are compiled
as loadable modules, extcon_get_edev_name() function symbol is not
visible to client driver. Hence mark extcon_find_edev_name() function
as exported symbol.
Signed-off-by: Mayank Rana <mrana@codeaurora.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
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Patch nand_suspend() & nand_resume() to let manufacturers overwrite
suspend/resume operations.
Signed-off-by: Mason Yang <masonccyang@mxic.com.tw>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/1584517348-14486-2-git-send-email-masonccyang@mxic.com.tw
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There are few maximum bus frequencies being used in the I²C core code.
Provide generic definitions for bus frequencies and use them in the core.
The drivers may use predefined constants where it is appropriate.
Some of them are already using these under slightly different names.
We will convert them later to use newly introduced defines.
Note, the name of modes are chosen to follow well established naming
scheme [1].
These definitions will also help to avoid typos in the numbers that
may lead to subtle errors.
[1]: https://en.wikipedia.org/wiki/I%C2%B2C#Differences_between_modes
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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There is no reason that this gunk is in a generic header file. The wildcard
defines need to stay as they are required by file2alias.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lkml.kernel.org/r/20200320131508.736205164@linutronix.de
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For graphics drivers needing to modify the page-protection, add
huge page-table entries counterparts to vmf_insert_pfn_prot().
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: "Jérôme Glisse" <jglisse@redhat.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Thomas Hellstrom (VMware) <thomas_os@shipmail.org>
Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
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For VM_PFNMAP and VM_MIXEDMAP vmas that want to support transhuge pages
and -page table entries, introduce vma_is_special_huge() that takes the
same codepaths as vma_is_dax().
The use of "special" follows the definition in memory.c, vm_normal_page():
"Special" mappings do not wish to be associated with a "struct page"
(either it doesn't exist, or it exists but they don't want to touch it)
For PAGE_SIZE pages, "special" is determined per page table entry to be
able to deal with COW pages. But since we don't have huge COW pages,
we can classify a vma as either "special huge" or "normal huge".
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: "Jérôme Glisse" <jglisse@redhat.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Thomas Hellstrom (VMware) <thomas_os@shipmail.org>
Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
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The function is used by upcoming vma_is_special_huge() with which we want
to use a const vma argument. Since for vma_is_dax() the vma argument is
only dereferenced for reading, constify it.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: "Jérôme Glisse" <jglisse@redhat.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Thomas Hellstrom (VMware) <thomas_os@shipmail.org>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Acked-by: Christian König <christian.koenig@amd.com>
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The pmi8994 is commonly found on MSM8996 based devices, such as the
Dragonboard 820c, where it supplies power to a number of LDOs on the
primary PMIC.
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20200324041424.518160-1-bjorn.andersson@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
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v5.7/vfio/next
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Allow bus drivers to provide their own callback to match a device to
the user provided string.
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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vfio_group_pin_pages() and vfio_group_unpin_pages() are introduced to
avoid inefficient search/check/ref/deref opertions associated with VFIO
group as those in each calling into vfio_pin_pages() and
vfio_unpin_pages().
VFIO group is taken as arg directly. The callers combine
search/check/ref/deref operations associated with VFIO group by calling
vfio_group_get_external_user()/vfio_group_get_external_user_from_dev()
beforehand, and vfio_group_put_external_user() afterwards.
Suggested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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vfio_dma_rw will read/write a range of user space memory pointed to by
IOVA into/from a kernel buffer without enforcing pinning the user space
memory.
TODO: mark the IOVAs to user space memory dirty if they are written in
vfio_dma_rw().
Cc: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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external user calls vfio_group_get_external_user_from_dev() with a device
pointer to get the VFIO group associated with this device.
The VFIO group is checked to be vialbe and have IOMMU set. Then
container user counter is increased and VFIO group reference is hold
to prevent the VFIO group from disposal before external user exits.
when the external user finishes using of the VFIO group, it calls
vfio_group_put_external_user() to dereference the VFIO group and the
container user counter.
Suggested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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All these are just used in block/partitions/msdos.c, so move them out of the
genhd.h driver included by every driver.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Just always use NEW_SOLARIS_X86_PARTITION and explain the situation,
as that is less confusing than two names for a single value.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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The enum containing the *_PARTITION symbolic names is only relevant
for the partition parser. More specifically most values are MSDOS
partition table system indicators and thus should go straight into
msdos.c. One value is only used by the sun partition parser, and the
sun and sgi partition parsers use the same value as the x86 Linux
RAID indicator to also indicate RAID autodetection. Duplicate them
in sun.c and sgi.c given that the different partition types use
entirely different values otherwise.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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struct partition is the on-disk format of a MSDOS partition table entry.
Move it out of genhd.h into a new msdos_partition.h header and give it
a msdos_ prefix to avoid confusion.
Also move the magic number from block/partitions/msdos.h to the new
header so that it can be used by the SCSI drivers looking at the DOS
partition tables.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Add a new include/linux/raid/detect.h header to declare the
md_autodetect_dev prototype which can be shared between md and
the partition code. Then use IS_BUILTIN to call it instead of the
ifdef magic.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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read_dev_sector and put_dev_sector are now only used by the partition
parsing code. Remove the export for read_dev_sector and merge it into
the only caller. Clean the mess up a bit by using goto labels and
the SECTOR_SHIFT constant.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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There isn't any good reason not to simply open code the allocation and
freeing of the partition_meta_info structure. Especially as one of
the branches in alloc_part_info is entirely dead code.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Move the sysfs _show methods that are used both on the full disk and
partition nodes to genhd.c instead of hiding them in the partitioning
code. Also move the declaration for these methods to block/blk.h so
that we don't expose them to drivers.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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There is no good reason for __bdevname to exist. Just open code
printing the string in the callers. For three of them the format
string can be trivially merged into existing printk statements,
and in init/do_mounts.c we can at least do the scnprintf once at
the start of the function, and unconditional of CONFIG_BLOCK to
make the output for tiny configfs a little more helpful.
Acked-by: Theodore Ts'o <tytso@mit.edu> # for ext4
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by
this change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20200226223125.GA20630@embeddedor
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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strobe-dll-delay-target is the delay cell add on the strobe line.
Strobe line the the uSDHC loopback read clock which is use in HS400
mode. Different strobe-dll-delay-target may need to set for different
board/SoC. If this delay cell is not set to an appropriate value,
we may see some read operation meet CRC error after HS400 mode select
which already pass the tuning.
This patch add the strobe-dll-delay-target setting in driver, so that
user can easily config this delay cell in dts file.
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/1582100757-20683-1-git-send-email-haibo.chen@nxp.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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