linux/kernel/power, branch v4.3

Merge branch 'for-4.3/core' of git://git.kernel.dk/linux-block

2015-09-02T20:10:25Z

Pull core block updates from Jens Axboe: "This first core part of the block IO changes contains: - Cleanup of the bio IO error signaling from Christoph. We used to rely on the uptodate bit and passing around of an error, now we store the error in the bio itself. - Improvement of the above from myself, by shrinking the bio size down again to fit in two cachelines on x86-64. - Revert of the max_hw_sectors cap removal from a revision again, from Jeff Moyer. This caused performance regressions in various tests. Reinstate the limit, bump it to a more reasonable size instead. - Make /sys/block//queue/discard_max_bytes writeable, by me. Most devices have huge trim limits, which can cause nasty latencies when deleting files. Enable the admin to configure the size down. We will look into having a more sane default instead of UINT_MAX sectors. - Improvement of the SGP gaps logic from Keith Busch. - Enable the block core to handle arbitrarily sized bios, which enables a nice simplification of bio_add_page() (which is an IO hot path). From Kent. - Improvements to the partition io stats accounting, making it faster. From Ming Lei. - Also from Ming Lei, a basic fixup for overflow of the sysfs pending file in blk-mq, as well as a fix for a blk-mq timeout race condition. - Ming Lin has been carrying Kents above mentioned patches forward for a while, and testing them. Ming also did a few fixes around that. - Sasha Levin found and fixed a use-after-free problem introduced by the bio->bi_error changes from Christoph. - Small blk cgroup cleanup from Viresh Kumar" * 'for-4.3/core' of git://git.kernel.dk/linux-block: (26 commits) blk: Fix bio_io_vec index when checking bvec gaps block: Replace SG_GAPS with new queue limits mask block: bump BLK_DEF_MAX_SECTORS to 2560 Revert "block: remove artifical max_hw_sectors cap" blk-mq: fix race between timeout and freeing request blk-mq: fix buffer overflow when reading sysfs file of 'pending' Documentation: update notes in biovecs about arbitrarily sized bios block: remove bio_get_nr_vecs() fs: use helper bio_add_page() instead of open coding on bi_io_vec block: kill merge_bvec_fn() completely md/raid5: get rid of bio_fits_rdev() md/raid5: split bio for chunk_aligned_read block: remove split code in blkdev_issue_{discard,write_same} btrfs: remove bio splitting and merge_bvec_fn() calls bcache: remove driver private bio splitting code block: simplify bio_add_page() block: make generic_make_request handle arbitrarily sized bios blk-cgroup: Drop unlikely before IS_ERR(_OR_NULL) block: don't access bio->bi_error after bio_put() block: shrink struct bio down to 2 cache lines again ...

PM / suspend: make sync() on suspend-to-RAM build-time optional

2015-07-31T21:46:05Z

The Linux kernel suspend path has traditionally invoked sys_sync() before freezing user threads. But sys_sync() can be expensive, and some user-space OS's do not want the kernel to pay the cost of sys_sync() on every suspend -- preferring invoke sync() from user-space if/when they want it. So make sys_sync on suspend build-time optional. The default is unchanged. Signed-off-by: Len Brown Signed-off-by: Rafael J. Wysocki

block: add a bi_error field to struct bio

2015-07-29T14:55:15Z

Currently we have two different ways to signal an I/O error on a BIO: (1) by clearing the BIO_UPTODATE flag (2) by returning a Linux errno value to the bi_end_io callback The first one has the drawback of only communicating a single possible error (-EIO), and the second one has the drawback of not beeing persistent when bios are queued up, and are not passed along from child to parent bio in the ever more popular chaining scenario. Having both mechanisms available has the additional drawback of utterly confusing driver authors and introducing bugs where various I/O submitters only deal with one of them, and the others have to add boilerplate code to deal with both kinds of error returns. So add a new bi_error field to store an errno value directly in struct bio and remove the existing mechanisms to clean all this up. Signed-off-by: Christoph Hellwig Reviewed-by: Hannes Reinecke Reviewed-by: NeilBrown Signed-off-by: Jens Axboe

PM / autosleep: Use workqueue for user space wakeup sources garbage collector

2015-07-14T19:04:48Z

The synchronous synchronize_rcu() in wakeup_source_remove() makes user process which writes to /sys/kernel/wake_unlock blocked sometimes. For example, when android eventhub tries to release a wakelock, this blocking process can occur, and eventhub can't get input events for a while. Using a work item instead of direct function call at pm_wake_unlock() can prevent this unnecessary delay from happening. Signed-off-by: SungEun Kim Signed-off-by: Rafael J. Wysocki

Merge tag 'pm+acpi-4.2-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

2015-07-01T21:17:44Z

Pull power management and ACPI fixes from Rafael Wysocki: "These are fixes that didn't make it to the previous PM+ACPI pull request or are fixing issues introduced by it. Specifics: - Fix a recently added memory leak in an error path in the ACPI resources management code (Dan Carpenter) - Fix a build warning triggered by an ACPI video header function that should be static inline (Borislav Petkov) - Change names of helper function converting struct fwnode_handle pointers to either struct device_node or struct acpi_device pointers so they don't conflict with local variable names (Alexander Sverdlin) - Make the hibernate core re-enable nonboot CPUs on failures to disable them as expected (Vitaly Kuznetsov) - Increase the default timeout of the device suspend watchdog to prevent it from triggering too early on some systems (Takashi Iwai) - Prevent the cpuidle powernv driver from registering idle states with CPUIDLE_FLAG_TIMER_STOP set if CONFIG_TICK_ONESHOT is unset which leads to boot hangs (Preeti U Murthy)" * tag 'pm+acpi-4.2-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: tick/idle/powerpc: Do not register idle states with CPUIDLE_FLAG_TIMER_STOP set in periodic mode PM / sleep: Increase default DPM watchdog timeout to 60 PM / hibernate: re-enable nonboot cpus on disable_nonboot_cpus() failure ACPI / OF: Rename of_node() and acpi_node() to to_of_node() and to_acpi_node() ACPI / video: Inline acpi_video_set_dmi_backlight_type ACPI / resources: free memory on error in add_region_before()

Merge branch 'for-4.2/core' of git://git.kernel.dk/linux-block

2015-06-25T21:29:53Z

Pull core block IO update from Jens Axboe: "Nothing really major in here, mostly a collection of smaller optimizations and cleanups, mixed with various fixes. In more detail, this contains: - Addition of policy specific data to blkcg for block cgroups. From Arianna Avanzini. - Various cleanups around command types from Christoph. - Cleanup of the suspend block I/O path from Christoph. - Plugging updates from Shaohua and Jeff Moyer, for blk-mq. - Eliminating atomic inc/dec of both remaining IO count and reference count in a bio. From me. - Fixes for SG gap and chunk size support for data-less (discards) IO, so we can merge these better. From me. - Small restructuring of blk-mq shared tag support, freeing drivers from iterating hardware queues. From Keith Busch. - A few cfq-iosched tweaks, from Tahsin Erdogan and me. Makes the IOPS mode the default for non-rotational storage" * 'for-4.2/core' of git://git.kernel.dk/linux-block: (35 commits) cfq-iosched: fix other locations where blkcg_to_cfqgd() can return NULL cfq-iosched: fix sysfs oops when attempting to read unconfigured weights cfq-iosched: move group scheduling functions under ifdef cfq-iosched: fix the setting of IOPS mode on SSDs blktrace: Add blktrace.c to BLOCK LAYER in MAINTAINERS file block, cgroup: implement policy-specific per-blkcg data block: Make CFQ default to IOPS mode on SSDs block: add blk_set_queue_dying() to blkdev.h blk-mq: Shared tag enhancements block: don't honor chunk sizes for data-less IO block: only honor SG gap prevention for merges that contain data block: fix returnvar.cocci warnings block, dm: don't copy bios for request clones block: remove management of bi_remaining when restoring original bi_end_io block: replace trylock with mutex_lock in blkdev_reread_part() block: export blkdev_reread_part() and __blkdev_reread_part() suspend: simplify block I/O handling block: collapse bio bit space block: remove unused BIO_RW_BLOCK and BIO_EOF flags block: remove BIO_EOPNOTSUPP ...

PM / sleep: Increase default DPM watchdog timeout to 60

2015-06-24T22:35:16Z

Many harddisks (mostly WD ones) have firmware problems and take too long, more than 10 seconds, to resume from suspend. And this often exceeds the default DPM watchdog timeout (12 seconds), resulting in a kernel panic out of sudden. Since most distros just take the default as is, we should give a bit more safer value. This patch increases the default value from 12 seconds to one minute, which has been confirmed to be long enough for such problematic disks. Link: https://bugzilla.kernel.org/show_bug.cgi?id=91921 Fixes: 70fea60d888d (PM / Sleep: Detect device suspend/resume lockup and log event) Cc: 3.13+ # 3.13+ Signed-off-by: Takashi Iwai Signed-off-by: Rafael J. Wysocki

PM / hibernate: re-enable nonboot cpus on disable_nonboot_cpus() failure

2015-06-24T21:48:44Z

When disable_nonboot_cpus() fails on some cpu it doesn't bring back all cpus it managed to offline, a consequent call to enable_nonboot_cpus() is expected. In hibernation_platform_enter() we don't call enable_nonboot_cpus() on error so cpus stay offlined. create_image() and resume_target_kernel() functions handle disable_nonboot_cpus() faults correctly, hibernation_platform_enter() is the only one which is doing it wrong. Signed-off-by: Vitaly Kuznetsov Signed-off-by: Rafael J. Wysocki

suspend: simplify block I/O handling

2015-05-19T15:19:59Z

Stop abusing struct page functionality and the swap end_io handler, and instead add a modified version of the blk-lib.c bio_batch helpers. Also move the block I/O code into swap.c as they are directly tied into each other. Signed-off-by: Christoph Hellwig Tested-by: Pavel Machek Tested-by: Ming Lin Acked-by: Pavel Machek Acked-by: Rafael J. Wysocki Signed-off-by: Jens Axboe

PM / sleep: Return -EBUSY from suspend_enter() on wakeup detection

2015-05-19T00:26:56Z

If a wakeup source is found to be pending in the last stage of suspend after syscore suspend, then the machine won't suspend, but suspend_enter() will return 0. That is confusing, as wakeup detection elsewhere causes -EBUSY to be returned from suspend_enter(). To avoid the confusion, make suspend_enter() return -EBUSY in that case too. Signed-off-by: Ruchi Kandoi [ rjw: Subject and changelog ] Signed-off-by: Rafael J. Wysocki