It is incorrect to call pm_runtime_get_sync() under
device_links_write_lock(), because it may end up trying to take
device_links_read_lock() while resuming the target device and that
will deadlock in the non-SRCU case, so avoid that by resuming the
supplier device in device_link_add() before calling
device_links_write_lock().
Fixes: 21d5c57b37 ("PM / runtime: Use device links")
Fixes: baa8809f60 ("PM / runtime: Optimize the use of device links")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
After commit ead18c23c2 ("driver core: Introduce device links
reference counting"), if there is a link between the given supplier
and the given consumer already, device_link_add() will refcount it
and return it unconditionally. However, if the flags passed to
it on the second (or any subsequent) attempt to create a device
link between the same consumer-supplier pair are not compatible with
the existing link's flags, that is incorrect.
First off, if the existing link is stateless and the next caller of
device_link_add() for the same consumer-supplier pair wants a
stateful one, or the other way around, the existing link cannot be
returned, because it will not match the expected behavior, so make
device_link_add() dump the stack and return NULL in that case.
Moreover, if the DL_FLAG_AUTOREMOVE_CONSUMER flag is passed to
device_link_add(), its caller will expect its reference to the link
to be dropped automatically on consumer driver removal, which will
not happen if that flag is not set in the link's flags (and
analogously for DL_FLAG_AUTOREMOVE_SUPPLIER). For this reason, make
device_link_add() update the existing link's flags accordingly
before returning it to the caller.
Fixes: ead18c23c2 ("driver core: Introduce device links reference counting")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Change the list walk in device_links_driver_cleanup() to a safe one
to avoid use-after-free when dropping a link from the list during the
walk.
Also, while at it, fix device_link_add() to refuse to create
stateless device links with DL_FLAG_AUTOREMOVE_SUPPLIER set, which is
an invalid combination (setting that flag means that the driver core
should manage the link, so it cannot be stateless), and extend the
kerneldoc comment of device_link_add() to cover the
DL_FLAG_AUTOREMOVE_SUPPLIER flag properly too.
Fixes: 1689cac5b3 ("driver core: Add flag to autoremove device link on supplier unbind")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Silence warnings (triggered at W=1) by adding relevant __printf
attributes.
drivers/base/cpu.c:432:2: warning: function '__cpu_device_create' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
Signed-off-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The current async_probe test code is only testing one device allocated
prior to driver load and only loading one device afterwards. Instead of
doing things this way it makes much more sense to load one device per CPU
in order to actually stress the async infrastructure. By doing this we
should see delays significantly increase in the event of devices being
serialized.
In addition I have updated the test to verify that we are trying to place
the work on the correct NUMA node when we are running in async mode. By
doing this we can verify the best possible outcome for device and driver
load times.
I have added a timeout value that is used to disable the sleep and instead
cause the probe routine to report an error indicating it timed out. By
doing this we limit the maximum runtime for the test to 20 seconds or less.
The last major change in this set is that I have gone through and tuned it
for handling the massive number of possible events that will be scheduled.
Instead of reporting the sleep for each individual device it is moved to
only being displayed if we enable debugging.
With this patch applied below are what a failing test and a passing test
should look like. I elided a few hundred lines in the failing test that
were duplicated since the system I was testing on had a massive number of
CPU cores:
-- Failing --
[ 243.524697] test_async_driver_probe: registering first set of asynchronous devices...
[ 243.535625] test_async_driver_probe: registering asynchronous driver...
[ 243.543038] test_async_driver_probe: registration took 0 msecs
[ 243.549559] test_async_driver_probe: registering second set of asynchronous devices...
[ 243.568350] platform test_async_driver.447: registration took 9 msecs
[ 243.575544] test_async_driver_probe: registering first synchronous device...
[ 243.583454] test_async_driver_probe: registering synchronous driver...
[ 248.825920] test_async_driver_probe: registration took 5235 msecs
[ 248.825922] test_async_driver_probe: registering second synchronous device...
[ 248.825928] test_async_driver test_async_driver.443: NUMA node mismatch 3 != 1
[ 248.825932] test_async_driver test_async_driver.445: NUMA node mismatch 3 != 1
[ 248.825935] test_async_driver test_async_driver.446: NUMA node mismatch 3 != 1
[ 248.825939] test_async_driver test_async_driver.440: NUMA node mismatch 3 != 1
[ 248.825943] test_async_driver test_async_driver.441: NUMA node mismatch 3 != 1
...
[ 248.827150] test_async_driver test_async_driver.229: NUMA node mismatch 0 != 1
[ 248.827158] test_async_driver test_async_driver.228: NUMA node mismatch 0 != 1
[ 248.827220] test_async_driver test_async_driver.281: NUMA node mismatch 2 != 1
[ 248.827229] test_async_driver test_async_driver.282: NUMA node mismatch 2 != 1
[ 248.827240] test_async_driver test_async_driver.280: NUMA node mismatch 2 != 1
[ 253.945834] test_async_driver test_async_driver.1: NUMA node mismatch 0 != 1
[ 253.945878] test_sync_driver test_sync_driver.1: registration took 5119 msecs
[ 253.961693] test_async_driver_probe: async events still pending, forcing timeout and synchronize
[ 259.065839] test_async_driver test_async_driver.2: NUMA node mismatch 0 != 1
[ 259.073786] test_async_driver test_async_driver.3: async probe took too long
[ 259.081669] test_async_driver test_async_driver.3: NUMA node mismatch 0 != 1
[ 259.089569] test_async_driver test_async_driver.4: async probe took too long
[ 259.097451] test_async_driver test_async_driver.4: NUMA node mismatch 0 != 1
[ 259.105338] test_async_driver test_async_driver.5: async probe took too long
[ 259.113204] test_async_driver test_async_driver.5: NUMA node mismatch 0 != 1
[ 259.121089] test_async_driver test_async_driver.6: async probe took too long
[ 259.128961] test_async_driver test_async_driver.6: NUMA node mismatch 0 != 1
[ 259.136850] test_async_driver test_async_driver.7: async probe took too long
...
[ 262.124062] test_async_driver test_async_driver.221: async probe took too long
[ 262.132130] test_async_driver test_async_driver.221: NUMA node mismatch 3 != 1
[ 262.140206] test_async_driver test_async_driver.222: async probe took too long
[ 262.148277] test_async_driver test_async_driver.222: NUMA node mismatch 3 != 1
[ 262.156351] test_async_driver test_async_driver.223: async probe took too long
[ 262.164419] test_async_driver test_async_driver.223: NUMA node mismatch 3 != 1
[ 262.172630] test_async_driver_probe: Test failed with 222 errors and 336 warnings
-- Passing --
[ 105.419247] test_async_driver_probe: registering first set of asynchronous devices...
[ 105.432040] test_async_driver_probe: registering asynchronous driver...
[ 105.439718] test_async_driver_probe: registration took 0 msecs
[ 105.446239] test_async_driver_probe: registering second set of asynchronous devices...
[ 105.477986] platform test_async_driver.447: registration took 22 msecs
[ 105.485276] test_async_driver_probe: registering first synchronous device...
[ 105.493169] test_async_driver_probe: registering synchronous driver...
[ 110.597981] test_async_driver_probe: registration took 5097 msecs
[ 110.604806] test_async_driver_probe: registering second synchronous device...
[ 115.707490] test_sync_driver test_sync_driver.1: registration took 5094 msecs
[ 115.715478] test_async_driver_probe: completed successfully
Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Use the device specific version of the async_schedule commands to defer
various tasks related to power management. By doing this we should see a
slight improvement in performance as any device that is sensitive to
latency/locality in the setup will now be initializing on the node closest
to the device.
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Call the asynchronous probe routines on a CPU local to the device node. By
doing this we should be able to improve our initialization time
significantly as we can avoid having to access the device from a remote
node which may introduce higher latency.
For example, in the case of initializing memory for NVDIMM this can have a
significant impact as initialing 3TB on remote node can take up to 39
seconds while initialing it on a local node only takes 23 seconds. It is
situations like this where we will see the biggest improvement.
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Probe devices asynchronously instead of the driver. This results in us
seeing the same behavior if the device is registered before the driver or
after. This way we can avoid serializing the initialization should the
driver not be loaded until after the devices have already been added.
The motivation behind this is that if we have a set of devices that
take a significant amount of time to load we can greatly reduce the time to
load by processing them in parallel instead of one at a time. In addition,
each device can exist on a different node so placing a single thread on one
CPU to initialize all of the devices for a given driver can result in poor
performance on a system with multiple nodes.
This approach can reduce the time needed to scan SCSI LUNs significantly.
The only way to realize that speedup is by enabling more concurrency which
is what is achieved with this patch.
To achieve this it was necessary to add a new member "async_driver" to the
device_private structure to store the driver pointer while we wait on the
deferred probe call.
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Try to consolidate all of the locking and unlocking of both the parent and
device when attaching or removing a driver from a given device.
To do that I first consolidated the lock pattern into two functions
__device_driver_lock and __device_driver_unlock. After doing that I then
created functions specific to attaching and detaching the driver while
acquiring these locks. By doing this I was able to reduce the number of
spots where we touch need_parent_lock from 12 down to 4.
This patch should produce no functional changes, it is meant to be a code
clean-up/consolidation only.
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Add an additional bit flag to the device_private struct named "dead".
This additional flag provides a guarantee that when a device_del is
executed on a given interface an async worker will not attempt to attach
the driver following the earlier device_del call. Previously this
guarantee was not present and could result in the device_del call
attempting to remove a driver from an interface only to have the async
worker attempt to probe the driver later when it finally completes the
asynchronous probe call.
One additional change added was that I pulled the check for dev->driver
out of the __device_attach_driver call and instead placed it in the
__device_attach_async_helper call. This was motivated by the fact that the
only other caller of this, __device_attach, had already taken the
device_lock() and checked for dev->driver. Instead of testing for this
twice in this path it makes more sense to just consolidate the dev->dead
and dev->driver checks together into one set of checks.
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
DL_FLAG_AUTOREMOVE_CONSUMER/SUPPLIER means "Remove the link
automatically on consumer/supplier driver unbind", that means we should
remove whole the device_link when there is no this driver no matter what
the ref_count of the link is.
CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
On platforms making a fair use of regulators, the dev_info() messages
coming from the device link function are a bit too verbose. The amount
of message will increase further with the clock framework joining the
device link party.
These messages looks valuable for people debugging device link related
issues, so dev_dbg() looks more appropriate than dev_info().
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Acked-by: Kevin Hilman <khilman@baylibre.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Currently, the 'firmware' directory only contains a single Makefile
to embed extra firmware into the kernel.
Move it to the more relevant place.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The whole code of fallback_table.c is surrounded by #ifdef of
CONFIG_FW_LOADER_USER_HELPER.
Move the CONFIG_FW_LOADER_USER_HELPER switch to Makefile so that
it is not compiled at all when this CONFIG option is disabled.
I also removed the confusing comment, "Module or buit-in [sic]".
CONFIG_FW_LOADER_USER_HELPER is a boolean option.
(If it were a module, CONFIG_FW_LOADER_USER_HELPER_MODULE would
be defined instead.)
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
As the description of struct device_private says, it stores data which
is private to driver core. And it already has similar fields like:
knode_parent, knode_driver, knode_driver and knode_bus. This look it is
more proper to put knode_class together with those fields to make it
private to driver core.
This patch move device->knode_class to device_private to make it comply
with code convention.
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cast autosuspend_delay to u64 to make sure that the full computation
of 'expires' or slack will be done in u64, even on 32bits arch.
Otherwise, any delay greater than 2^31 nsec can overflow if signed
32bits is used when converting delay from msec to nsec.
Fixes: 8234f6734c (PM-runtime: Switch autosuspend over to using hrtimers)
Reported-by: Tony Lindgren <tony@atomide.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
PM-runtime now uses the hrtimers infrastructure for autosuspend, however
comments still reference 'jiffies'.
Fixes: 8234f6734c (PM-runtime: Switch autosuspend over to using hrtimers)
Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
We are trying to get rid of BUS_ATTR() so drop the last user of it from
the tree. We had to "open code" it in order to prevent a function name
conflict due to the use of DEVICE_ATTR_WO() earlier in the file :(
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
We are trying to get rid of BUS_ATTR() and the usage of that in bus.c
can be trivially converted to use BUS_ATTR_WO and RW, so use those
macros instead.
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Pull vfs mount API prep from Al Viro:
"Mount API prereqs.
Mostly that's LSM mount options cleanups. There are several minor
fixes in there, but nothing earth-shattering (leaks on failure exits,
mostly)"
* 'mount.part1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (27 commits)
mount_fs: suppress MAC on MS_SUBMOUNT as well as MS_KERNMOUNT
smack: rewrite smack_sb_eat_lsm_opts()
smack: get rid of match_token()
smack: take the guts of smack_parse_opts_str() into a new helper
LSM: new method: ->sb_add_mnt_opt()
selinux: rewrite selinux_sb_eat_lsm_opts()
selinux: regularize Opt_... names a bit
selinux: switch away from match_token()
selinux: new helper - selinux_add_opt()
LSM: bury struct security_mnt_opts
smack: switch to private smack_mnt_opts
selinux: switch to private struct selinux_mnt_opts
LSM: hide struct security_mnt_opts from any generic code
selinux: kill selinux_sb_get_mnt_opts()
LSM: turn sb_eat_lsm_opts() into a method
nfs_remount(): don't leak, don't ignore LSM options quietly
btrfs: sanitize security_mnt_opts use
selinux; don't open-code a loop in sb_finish_set_opts()
LSM: split ->sb_set_mnt_opts() out of ->sb_kern_mount()
new helper: security_sb_eat_lsm_opts()
...
unreferenced object 0xffff808ec6dc5a80 (size 128):
comm "swapper/0", pid 1, jiffies 4294938063 (age 2560.530s)
hex dump (first 32 bytes):
ff ff ff ff 00 00 00 00 6b 6b 6b 6b 6b 6b 6b 6b ........kkkkkkkk
6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
backtrace:
[<00000000476dcf8c>] kmem_cache_alloc_trace+0x430/0x500
[<000000004f708d37>] platform_device_register_full+0xbc/0x1e8
[<000000006c2a7ec7>] acpi_create_platform_device+0x370/0x450
[<00000000ef135642>] acpi_default_enumeration+0x34/0x78
[<000000003bd9a052>] acpi_bus_attach+0x2dc/0x3e0
[<000000003cf4f7f2>] acpi_bus_attach+0x108/0x3e0
[<000000003cf4f7f2>] acpi_bus_attach+0x108/0x3e0
[<000000002968643e>] acpi_bus_scan+0xb0/0x110
[<0000000010dd0bd7>] acpi_scan_init+0x1a8/0x410
[<00000000965b3c5a>] acpi_init+0x408/0x49c
[<00000000ed4b9fe2>] do_one_initcall+0x178/0x7f4
[<00000000a5ac5a74>] kernel_init_freeable+0x9d4/0xa9c
[<0000000070ea6c15>] kernel_init+0x18/0x138
[<00000000fb8fff06>] ret_from_fork+0x10/0x1c
[<0000000041273a0d>] 0xffffffffffffffff
Then, faddr2line pointed out this line,
/*
* This memory isn't freed when the device is put,
* I don't have a nice idea for that though. Conceptually
* dma_mask in struct device should not be a pointer.
* See http://thread.gmane.org/gmane.linux.kernel.pci/9081
*/
pdev->dev.dma_mask =
kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
Since this leak has existed for more than 8 years and it does not
reference other parts of the memory, let kmemleak ignore it, so users
don't need to waste time reporting this in the future.
Link: http://lkml.kernel.org/r/20181206160751.36211-1-cai@gmx.us
Signed-off-by: Qian Cai <cai@gmx.us>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Fix two potential NULL pointer dereferences found by Coverity in
the software nodes code introduced recently (Colin Ian King).
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Merge tag 'devprop-4.21-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull device properties framework fixes from Rafael Wysocki:
"Fix two potential NULL pointer dereferences found by Coverity in the
software nodes code introduced recently (Colin Ian King)"
* tag 'devprop-4.21-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
drivers: base: swnode: check if swnode is NULL before dereferencing it
drivers: base: swnode: check if pointer p is NULL before dereferencing it
Devfreq framework supports suspend of its devices.
Call the the devfreq interface and allow devfreq devices
preserve/restore their states during suspend/resume.
Suggested-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Subsystem:
- new %ptR printk format
- rename core files
- allow registration of multiple nvmem devices
New driver:
- i.MX system controller RTC
Drivers:
- abx80x: handle voltage ioctls, correct binding doc
- m41t80: correct month in alarm reads
- pcf85363: add pcf85263 support
- pcf8523: properly handle battery low flag
- s3c: limit alarm to one year in the future as ALMYEAR is broken
- sun6i: rework clock output binding
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Merge tag 'rtc-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux
Pull RTC updates from Alexandre Belloni:
"Subsystem:
- new %ptR printk format
- rename core files
- allow registration of multiple nvmem devices
New driver:
- i.MX system controller RTC
Driver updates:
- abx80x: handle voltage ioctls, correct binding doc
- m41t80: correct month in alarm reads
- pcf85363: add pcf85263 support
- pcf8523: properly handle battery low flag
- s3c: limit alarm to one year in the future as ALMYEAR is broken
- sun6i: rework clock output binding"
* tag 'rtc-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (54 commits)
rtc: rename core files
rtc: nvmem: fix possible use after free
rtc: add i.MX system controller RTC support
dt-bindings: fsl: scu: add rtc binding
rtc: pcf2123: Add Microcrystal rv2123
rtc: class: reimplement devm_rtc_device_register
rtc: enforce rtc_timer_init private_data type
rtc: abx80x: Implement RTC_VL_READ,CLR ioctls
rtc: pcf85363: Add support for NXP pcf85263 rtc
dt-bindings: rtc: pcf85363: Document pcf85263 real-time clock
rtc: pcf8523: don't return invalid date when battery is low
dt-bindings: rtc: use a generic node name for ds1307
PM: Switch to use %ptR
m68k/mac: Switch to use %ptR
Input: hp_sdc_rtc - Switch to use %ptR
rtc: tegra: Switch to use %ptR
rtc: s5m: Switch to use %ptR
rtc: s3c: Switch to use %ptR
rtc: rx8025: Switch to use %ptR
rtc: rx6110: Switch to use %ptR
...
Here is the "big" set of driver core patches for 4.21-rc1.
It's not really big, just a number of small changes for some reported
issues, some documentation updates to hopefully make it harder for
people to abuse the driver model, and some other minor cleanups.
All of these have been in linux-next for a while with no reported
issues.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core updates from Greg KH:
"Here is the "big" set of driver core patches for 4.21-rc1.
It's not really big, just a number of small changes for some reported
issues, some documentation updates to hopefully make it harder for
people to abuse the driver model, and some other minor cleanups.
All of these have been in linux-next for a while with no reported
issues"
* tag 'driver-core-4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
mm, memory_hotplug: update a comment in unregister_memory()
component: convert to DEFINE_SHOW_ATTRIBUTE
sysfs: Disable lockdep for driver bind/unbind files
driver core: Add missing dev->bus->need_parent_lock checks
kobject: return error code if writing /sys/.../uevent fails
driver core: Move async_synchronize_full call
driver core: platform: Respect return code of platform_device_register_full()
kref/kobject: Improve documentation
drivers/base/memory.c: Use DEVICE_ATTR_RO and friends
driver core: Replace simple_strto{l,ul} by kstrtou{l,ul}
kernfs: Improve kernfs_notify() poll notification latency
kobject: Fix warnings in lib/kobject_uevent.c
kobject: drop unnecessary cast "%llu" for u64
driver core: fix comments for device_block_probing()
driver core: Replace simple_strtol by kstrtoint
Merge misc updates from Andrew Morton:
- large KASAN update to use arm's "software tag-based mode"
- a few misc things
- sh updates
- ocfs2 updates
- just about all of MM
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (167 commits)
kernel/fork.c: mark 'stack_vm_area' with __maybe_unused
memcg, oom: notify on oom killer invocation from the charge path
mm, swap: fix swapoff with KSM pages
include/linux/gfp.h: fix typo
mm/hmm: fix memremap.h, move dev_page_fault_t callback to hmm
hugetlbfs: Use i_mmap_rwsem to fix page fault/truncate race
hugetlbfs: use i_mmap_rwsem for more pmd sharing synchronization
memory_hotplug: add missing newlines to debugging output
mm: remove __hugepage_set_anon_rmap()
include/linux/vmstat.h: remove unused page state adjustment macro
mm/page_alloc.c: allow error injection
mm: migrate: drop unused argument of migrate_page_move_mapping()
blkdev: avoid migration stalls for blkdev pages
mm: migrate: provide buffer_migrate_page_norefs()
mm: migrate: move migrate_page_lock_buffers()
mm: migrate: lock buffers before migrate_page_move_mapping()
mm: migration: factor out code to compute expected number of page references
mm, page_alloc: enable pcpu_drain with zone capability
kmemleak: add config to select auto scan
mm/page_alloc.c: don't call kasan_free_pages() at deferred mem init
...
A huge update this time, but a lot of that is just consolidating or
removing code:
- provide a common DMA_MAPPING_ERROR definition and avoid indirect
calls for dma_map_* error checking
- use direct calls for the DMA direct mapping case, avoiding huge
retpoline overhead for high performance workloads
- merge the swiotlb dma_map_ops into dma-direct
- provide a generic remapping DMA consistent allocator for architectures
that have devices that perform DMA that is not cache coherent. Based
on the existing arm64 implementation and also used for csky now.
- improve the dma-debug infrastructure, including dynamic allocation
of entries (Robin Murphy)
- default to providing chaining scatterlist everywhere, with opt-outs
for the few architectures (alpha, parisc, most arm32 variants) that
can't cope with it
- misc sparc32 dma-related cleanups
- remove the dma_mark_clean arch hook used by swiotlb on ia64 and
replace it with the generic noncoherent infrastructure
- fix the return type of dma_set_max_seg_size (Niklas Söderlund)
- move the dummy dma ops for not DMA capable devices from arm64 to
common code (Robin Murphy)
- ensure dma_alloc_coherent returns zeroed memory to avoid kernel data
leaks through userspace. We already did this for most common
architectures, but this ensures we do it everywhere.
dma_zalloc_coherent has been deprecated and can hopefully be
removed after -rc1 with a coccinelle script.
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Merge tag 'dma-mapping-4.21' of git://git.infradead.org/users/hch/dma-mapping
Pull DMA mapping updates from Christoph Hellwig:
"A huge update this time, but a lot of that is just consolidating or
removing code:
- provide a common DMA_MAPPING_ERROR definition and avoid indirect
calls for dma_map_* error checking
- use direct calls for the DMA direct mapping case, avoiding huge
retpoline overhead for high performance workloads
- merge the swiotlb dma_map_ops into dma-direct
- provide a generic remapping DMA consistent allocator for
architectures that have devices that perform DMA that is not cache
coherent. Based on the existing arm64 implementation and also used
for csky now.
- improve the dma-debug infrastructure, including dynamic allocation
of entries (Robin Murphy)
- default to providing chaining scatterlist everywhere, with opt-outs
for the few architectures (alpha, parisc, most arm32 variants) that
can't cope with it
- misc sparc32 dma-related cleanups
- remove the dma_mark_clean arch hook used by swiotlb on ia64 and
replace it with the generic noncoherent infrastructure
- fix the return type of dma_set_max_seg_size (Niklas Söderlund)
- move the dummy dma ops for not DMA capable devices from arm64 to
common code (Robin Murphy)
- ensure dma_alloc_coherent returns zeroed memory to avoid kernel
data leaks through userspace. We already did this for most common
architectures, but this ensures we do it everywhere.
dma_zalloc_coherent has been deprecated and can hopefully be
removed after -rc1 with a coccinelle script"
* tag 'dma-mapping-4.21' of git://git.infradead.org/users/hch/dma-mapping: (73 commits)
dma-mapping: fix inverted logic in dma_supported
dma-mapping: deprecate dma_zalloc_coherent
dma-mapping: zero memory returned from dma_alloc_*
sparc/iommu: fix ->map_sg return value
sparc/io-unit: fix ->map_sg return value
arm64: default to the direct mapping in get_arch_dma_ops
PCI: Remove unused attr variable in pci_dma_configure
ia64: only select ARCH_HAS_DMA_COHERENT_TO_PFN if swiotlb is enabled
dma-mapping: bypass indirect calls for dma-direct
vmd: use the proper dma_* APIs instead of direct methods calls
dma-direct: merge swiotlb_dma_ops into the dma_direct code
dma-direct: use dma_direct_map_page to implement dma_direct_map_sg
dma-direct: improve addressability error reporting
swiotlb: remove dma_mark_clean
swiotlb: remove SWIOTLB_MAP_ERROR
ACPI / scan: Refactor _CCA enforcement
dma-mapping: factor out dummy DMA ops
dma-mapping: always build the direct mapping code
dma-mapping: move dma_cache_sync out of line
dma-mapping: move various slow path functions out of line
...
pages_correctly_probed is missing new lines which means that the line is
not printed rightaway but it rather waits for additional printks.
Add \n to all three messages in pages_correctly_probed.
Link: http://lkml.kernel.org/r/20181218162307.10518-1-mhocko@kernel.org
Fixes: b77eab7079 ("mm/memory_hotplug: optimize probe routine")
Signed-off-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
In cb5e39b803 ("drivers: base: refactor add_memory_section() to
add_memory_block()"), add_memory_block() is introduced, which is only
invoked in memory_dev_init().
When combining these two loops in memory_dev_init() and
add_memory_block(), they looks like this:
for (i = 0; i < NR_MEM_SECTIONS; i += sections_per_block)
for (j = i;
(j < i + sections_per_block) && j < NR_MEM_SECTIONS;
j++)
Since it is sure the (i < NR_MEM_SECTIONS) and j sits in its own memory
block, the check of (j < NR_MEM_SECTIONS) is not necessary.
This patch just removes this check.
Link: http://lkml.kernel.org/r/20181123222811.18216-1-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Seth Jennings <sjenning@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The to_software_mode() macro can potentially return NULL, so also add
a NULL check on swnode before dereferencing it to avoid any NULL
pointer dereferences.
Detected by CoverityScan, CID#1476052 ("Explicit null dereferenced")
Fixes: 59abd83672 (drivers: base: Introducing software nodes to the firmware node framework)
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
The pointer p can be potentially NULL as macro to_software_node can
return NULL.
Add null check on p before dereferencing it to avoid any NULL pointer
dereferences.
Detected by CoverityScan, CID#1476039 ("Explicit null dereferenced")
Fixes: 59abd83672 (drivers: base: Introducing software nodes to the firmware node framework)
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Pull irq updates from Thomas Gleixner:
"The interrupt department provides:
Core updates:
- Better spreading to NUMA nodes in the affinity management
- Support for more than one set of interrupts to spread out to allow
separate queues for separate functionality of a single device.
- Decouple the non queue interrupts from being managed. Those are
usually general interrupts for error handling etc. and those should
never be shut down. This also a preparation to utilize the
spreading mechanism for initial spreading of non-managed interrupts
later.
- Make the single CPU target selection in the matrix allocator more
balanced so interrupts won't accumulate on single CPUs in certain
situations.
- A large spell checking patch so we don't end up fixing single typos
over and over.
Driver updates:
- A bunch of new irqchip drivers (RDA8810PL, Madera, imx-irqsteer)
- Updates for the 8MQ, F1C100s platform drivers
- A number of SPDX cleanups
- A workaround for a very broken GICv3 implementation on msm8996
which sports a botched register set.
- A platform-msi fix to prevent memory leakage
- Various cleanups"
* 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (37 commits)
genirq/affinity: Add is_managed to struct irq_affinity_desc
genirq/core: Introduce struct irq_affinity_desc
genirq/affinity: Remove excess indentation
irqchip/stm32: protect configuration registers with hwspinlock
dt-bindings: interrupt-controller: stm32: Document hwlock properties
irqchip: Add driver for imx-irqsteer controller
dt-bindings/irq: Add binding for Freescale IRQSTEER multiplexer
irqchip: Add driver for Cirrus Logic Madera codecs
genirq: Fix various typos in comments
irqchip/irq-imx-gpcv2: Add IRQCHIP_DECLARE for i.MX8MQ compatible
irqchip/irq-rda-intc: Fix return value check in rda8810_intc_init()
irqchip/irq-imx-gpcv2: Silence "fall through" warning
irqchip/gic-v3: Add quirk for msm8996 broken registers
irqchip/gic: Add support to device tree based quirks
dt-bindings/gic-v3: Add msm8996 compatible string
irqchip/sun4i: Add support for Allwinner ARMv5 F1C100s
irqchip/sun4i: Move IC specific register offsets to struct
irqchip/sun4i: Add a struct to hold global variables
dt-bindings: interrupt-controller: Add suniv interrupt-controller
irqchip: Add RDA8810PL interrupt driver
...
- Introduce "software nodes", analogous to the DT and ACPI firmware
nodes except that they can be created by kernel code, in order to
complement fwnodes representing real firmware nodes when they are
incomplete (for example missing device properties) and to supply
the primary fwnode when the firmware lacks hardware description
for a device completely, and replace the "property_set" struct
fwnode_handle type with software nodes (Heikki Krogerus).
- Clean up the just introduced software nodes support and fix a commet
in the graph-handling code (Colin Ian King, Marco Felsch).
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Merge tag 'devprop-4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull device properties framework updates from Rafael Wysocki:
"This introduces 'software nodes' that are analogous to the DT and ACPI
firmware nodes except that they can be created by drivers themselves
and do a couple of assorted cleanups.
Specifics:
- Introduce "software nodes", analogous to the DT and ACPI firmware
nodes except that they can be created by kernel code, in order to
complement fwnodes representing real firmware nodes when they are
incomplete (for example missing device properties) and to supply
the primary fwnode when the firmware lacks hardware description for
a device completely, and replace the "property_set" struct
fwnode_handle type with software nodes (Heikki Krogerus).
- Clean up the just introduced software nodes support and fix a
commet in the graph-handling code (Colin Ian King, Marco Felsch)"
* tag 'devprop-4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
device property: fix fwnode_graph_get_next_endpoint() documentation
drivers: base: swnode: remove need for a temporary string for the node name
device property: Remove struct property_set
device property: Move device_add_properties() to swnode.c
drivers: base: Introducing software nodes to the firmware node framework
ACPI / glue: Add acpi_platform_notify() function
drivers core: Prepare support for multiple platform notifications
driver core: platform: Remove duplicated device_remove_properties() call
This has been a busy release for the regmap-irq code, there's several
new features been added, including an API cleanup for how we specify
types that affected one existing driver (gpio-max77620):
- Support for hardware that flags rising and falling edges on separate
status bits from Bartosz Golaszewski.
- Support for explicitly clearing interrupts before unmasking from
Bartosz Golaszewski.
- Support for level triggered IRQs from Matti Vaittinen.
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Merge tag 'regmap-v4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap
Pull regmap updates from Mark Brown:
"This has been a busy release for the regmap-irq code, there's several
new features been added, including an API cleanup for how we specify
types that affected one existing driver (gpio-max77620):
- Support for hardware that flags rising and falling edges on
separate status bits from Bartosz Golaszewski.
- Support for explicitly clearing interrupts before unmasking from
Bartosz Golaszewski.
- Support for level triggered IRQs from Matti Vaittinen"
* tag 'regmap-v4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
regmap: irq: add an option to clear status registers on unmask
regmap: regmap-irq/gpio-max77620: add level-irq support
regmap: regmap-irq: Remove default irq type setting from core
regmap: debugfs: convert to DEFINE_SHOW_ATTRIBUTE
regmap: rbtree: convert to DEFINE_SHOW_ATTRIBUTE
regmap: irq: handle HW using separate rising/falling edge interrupts
regmap: add a new macro:REGMAP_IRQ_REG_LINE(_id, _reg_bits)
Only the mount namespace code that implements mount(2) should be using the
MS_* flags. Suppress them inside the kernel unless uapi/linux/mount.h is
included.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Reviewed-by: David Howells <dhowells@redhat.com>
The remove_memory_block() function was renamed to in commit
cc292b0b43 ("drivers/base/memory.c: rename remove_memory_block() to
remove_memory_section()").
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Use DEFINE_SHOW_ATTRIBUTE macro to simplify the code.
Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Some interrupt controllers whose interrupts are acked on read will set
the status bits for masked interrupts without changing the state of
the IRQ line.
Some chips have an additional "feature" where if those set bits are
not cleared before unmasking their respective interrupts, the IRQ
line will change the state and we'll interpret this as an interrupt
although it actually fired when it was masked.
Add a new field to the irq chip struct that tells the regmap irq chip
code to always clear the status registers before actually changing the
irq mask values.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Add level active IRQ support to regmap-irq irqchip. Change breaks
existing regmap-irq type setting. Convert the existing drivers which
use regmap-irq with trigger type setting (gpio-max77620) to work
with this new approach. So we do not magically support level-active
IRQs on gpio-max77620 - but add support to the regmap-irq for chips
which support them =)
We do not support distinguishing situation where HW supports rising
and falling edge detection but not both. Separating this would require
inventing yet another flags for IRQ types.
Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
The common code should not set IRQ type. Read HW defaults to the
cache at startup instead of forcing type to EDGE_BOTH. If
default setting is needed this should be done via normal
mechanisms or by chip specific code if normal mechanisms are not
suitable for some reason. Common regmap-irq code should not have
defaults hard-coded but keep the HW/boot defaults untouched.
Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Tested-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This is the much more correct fix for my earlier attempt at:
https://lkml.org/lkml/2018/12/10/118
Short recap:
- There's not actually a locking issue, it's just lockdep being a bit
too eager to complain about a possible deadlock.
- Contrary to what I claimed the real problem is recursion on
kn->count. Greg pointed me at sysfs_break_active_protection(), used
by the scsi subsystem to allow a sysfs file to unbind itself. That
would be a real deadlock, which isn't what's happening here. Also,
breaking the active protection means we'd need to manually handle
all the lifetime fun.
- With Rafael we discussed the task_work approach, which kinda works,
but has two downsides: It's a functional change for a lockdep
annotation issue, and it won't work for the bind file (which needs
to get the errno from the driver load function back to userspace).
- Greg also asked why this never showed up: To hit this you need to
unregister a 2nd driver from the unload code of your first driver. I
guess only gpus do that. The bug has always been there, but only
with a recent patch series did we add more locks so that lockdep
built a chain from unbinding the snd-hda driver to the
acpi_video_unregister call.
Full lockdep splat:
[12301.898799] ============================================
[12301.898805] WARNING: possible recursive locking detected
[12301.898811] 4.20.0-rc7+ #84 Not tainted
[12301.898815] --------------------------------------------
[12301.898821] bash/5297 is trying to acquire lock:
[12301.898826] 00000000f61c6093 (kn->count#39){++++}, at: kernfs_remove_by_name_ns+0x3b/0x80
[12301.898841] but task is already holding lock:
[12301.898847] 000000005f634021 (kn->count#39){++++}, at: kernfs_fop_write+0xdc/0x190
[12301.898856] other info that might help us debug this:
[12301.898862] Possible unsafe locking scenario:
[12301.898867] CPU0
[12301.898870] ----
[12301.898874] lock(kn->count#39);
[12301.898879] lock(kn->count#39);
[12301.898883] *** DEADLOCK ***
[12301.898891] May be due to missing lock nesting notation
[12301.898899] 5 locks held by bash/5297:
[12301.898903] #0: 00000000cd800e54 (sb_writers#4){.+.+}, at: vfs_write+0x17f/0x1b0
[12301.898915] #1: 000000000465e7c2 (&of->mutex){+.+.}, at: kernfs_fop_write+0xd3/0x190
[12301.898925] #2: 000000005f634021 (kn->count#39){++++}, at: kernfs_fop_write+0xdc/0x190
[12301.898936] #3: 00000000414ef7ac (&dev->mutex){....}, at: device_release_driver_internal+0x34/0x240
[12301.898950] #4: 000000003218fbdf (register_count_mutex){+.+.}, at: acpi_video_unregister+0xe/0x40
[12301.898960] stack backtrace:
[12301.898968] CPU: 1 PID: 5297 Comm: bash Not tainted 4.20.0-rc7+ #84
[12301.898974] Hardware name: Hewlett-Packard HP EliteBook 8460p/161C, BIOS 68SCF Ver. F.01 03/11/2011
[12301.898982] Call Trace:
[12301.898989] dump_stack+0x67/0x9b
[12301.898997] __lock_acquire+0x6ad/0x1410
[12301.899003] ? kernfs_remove_by_name_ns+0x3b/0x80
[12301.899010] ? find_held_lock+0x2d/0x90
[12301.899017] ? mutex_spin_on_owner+0xe4/0x150
[12301.899023] ? find_held_lock+0x2d/0x90
[12301.899030] ? lock_acquire+0x90/0x180
[12301.899036] lock_acquire+0x90/0x180
[12301.899042] ? kernfs_remove_by_name_ns+0x3b/0x80
[12301.899049] __kernfs_remove+0x296/0x310
[12301.899055] ? kernfs_remove_by_name_ns+0x3b/0x80
[12301.899060] ? kernfs_name_hash+0xd/0x80
[12301.899066] ? kernfs_find_ns+0x6c/0x100
[12301.899073] kernfs_remove_by_name_ns+0x3b/0x80
[12301.899080] bus_remove_driver+0x92/0xa0
[12301.899085] acpi_video_unregister+0x24/0x40
[12301.899127] i915_driver_unload+0x42/0x130 [i915]
[12301.899160] i915_pci_remove+0x19/0x30 [i915]
[12301.899169] pci_device_remove+0x36/0xb0
[12301.899176] device_release_driver_internal+0x185/0x240
[12301.899183] unbind_store+0xaf/0x180
[12301.899189] kernfs_fop_write+0x104/0x190
[12301.899195] __vfs_write+0x31/0x180
[12301.899203] ? rcu_read_lock_sched_held+0x6f/0x80
[12301.899209] ? rcu_sync_lockdep_assert+0x29/0x50
[12301.899216] ? __sb_start_write+0x13c/0x1a0
[12301.899221] ? vfs_write+0x17f/0x1b0
[12301.899227] vfs_write+0xb9/0x1b0
[12301.899233] ksys_write+0x50/0xc0
[12301.899239] do_syscall_64+0x4b/0x180
[12301.899247] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[12301.899253] RIP: 0033:0x7f452ac7f7a4
[12301.899259] Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 80 00 00 00 00 8b 05 aa f0 2c 00 48 63 ff 85 c0 75 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 f3 c3 66 90 55 53 48 89 d5 48 89 f3 48 83
[12301.899273] RSP: 002b:00007ffceafa6918 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[12301.899282] RAX: ffffffffffffffda RBX: 000000000000000d RCX: 00007f452ac7f7a4
[12301.899288] RDX: 000000000000000d RSI: 00005612a1abf7c0 RDI: 0000000000000001
[12301.899295] RBP: 00005612a1abf7c0 R08: 000000000000000a R09: 00005612a1c46730
[12301.899301] R10: 000000000000000a R11: 0000000000000246 R12: 000000000000000d
[12301.899308] R13: 0000000000000001 R14: 00007f452af4a740 R15: 000000000000000d
Looking around I've noticed that usb and i2c already handle similar
recursion problems, where a sysfs file can unbind the same type of
sysfs somewhere else in the hierarchy. Relevant commits are:
commit 356c05d58a
Author: Alan Stern <stern@rowland.harvard.edu>
Date: Mon May 14 13:30:03 2012 -0400
sysfs: get rid of some lockdep false positives
commit e9b526fe70
Author: Alexander Sverdlin <alexander.sverdlin@nsn.com>
Date: Fri May 17 14:56:35 2013 +0200
i2c: suppress lockdep warning on delete_device
Implement the same trick for driver bind/unbind.
v2: Put the macro into bus.c (Greg).
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Ramalingam C <ramalingam.c@intel.com>
Cc: Arend van Spriel <aspriel@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Bartosz Golaszewski <brgl@bgdev.pl>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Vivek Gautam <vivek.gautam@codeaurora.org>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
We already have the DEFINE_SHOW_ATTRIBUTE, There is no need to define
such a macro, so remove define_genpd_open_function and
define_genpd_debugfs_fops.
Convert them to DEFINE_SHOW_ATTRIBUTE.
Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
PM-runtime uses the timer infrastructure for autosuspend. This implies
that the minimum time before autosuspending a device is in the range
of 1 tick included to 2 ticks excluded
-On arm64 this means between 4ms and 8ms with default jiffies
configuration
-And on arm, it is between 10ms and 20ms
These values are quite high for embedded systems which sometimes want
the duration to be in the range of 1 ms.
It is possible to switch autosuspend over to using hrtimers to get
finer granularity for short durations and take advantage of slack to
retain some margins and get long timeouts with minimum wakeups.
On an arm64 platform that uses 1ms for autosuspending timeout of its
GPU, idle power is reduced by 10% with hrtimer.
The latency impact on arm64 hikey octo cores is:
- mark_last_busy: from 1.11 us to 1.25 us
- rpm_suspend: from 15.54 us to 15.38 us
[Only the code path of rpm_suspend() that starts hrtimer has been
measured.]
arm64 image (arm64 default defconfig) decreases by around 3KB
with following details:
$ size vmlinux-timer
text data bss dec hex filename
12034646 6869268 386840 19290754 1265a82 vmlinux
$ size vmlinux-hrtimer
text data bss dec hex filename
12030550 6870164 387032 19287746 1264ec2 vmlinux
The latency impact on arm 32bits snowball dual cores is :
- mark_last_busy: from 0.31 us usec to 0.77 us
- rpm_suspend: from 6.83 us to 6.67 usec
The increase of the image for snowball platform that I used for
testing performance impact, is neglictable (244B).
$ size vmlinux-timer
text data bss dec hex filename
7157961 2119580 264120 9541661 91981d build-ux500/vmlinux
size vmlinux-hrtimer
text data bss dec hex filename
7157773 2119884 264248 9541905 919911 vmlinux-hrtimer
And arm 32bits image (multi_v7_defconfig) increases by around 1.7KB
with following details:
$ size vmlinux-timer
text data bss dec hex filename
13304443 6803420 402768 20510631 138f7a7 vmlinux
$ size vmlinux-hrtimer
text data bss dec hex filename
13304299 6805276 402768 20512343 138fe57 vmlinux
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
__device_release_driver() has to check dev->bus->need_parent_lock
before dropping the parent lock and acquiring it again as it may
attempt to drop a lock that hasn't been acquired or lock a device
that shouldn't be locked and create a lock imbalance.
Fixes: 8c97a46af0 (driver core: hold dev's parent lock when needed)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: stable <stable@vger.kernel.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Sync documentation with code.
Fixes: 07bb80d40b (device property: Add support for remote endpoints)
Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
