user/sven/linux.git/include/linux/cpufreq.h, branch v4.13.7

Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux

2017-07-14T20:12:32Z

Pull thermal management updates from Zhang Rui: - Improve thermal cpu_cooling interaction with cpufreq core. The cpu_cooling driver is designed to use CPU frequency scaling to avoid high thermal states for a platform. But it wasn't glued really well with cpufreq core. For example clipped-cpus is copied from the policy structure and its much better to use the policy->cpus (or related_cpus) fields directly as they may have got updated. Not that things were broken before this series, but they can be optimized a bit more. This series tries to improve interactions between cpufreq core and cpu_cooling driver and does some fixes/cleanups to the cpu_cooling driver. (Viresh Kumar) - A couple of fixes and cleanups in thermal core and imx, hisilicon, bcm_2835, int340x thermal drivers. (Arvind Yadav, Dan Carpenter, Sumeet Pawnikar, Srinivas Pandruvada, Willy WOLFF) * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux: (24 commits) thermal: bcm2835: fix an error code in probe() thermal: hisilicon: Handle return value of clk_prepare_enable thermal: imx: Handle return value of clk_prepare_enable thermal: int340x: check for sensor when PTYP is missing Thermal/int340x: Fix few typos and kernel-doc style thermal: fix source code documentation for parameters thermal: cpu_cooling: Replace kmalloc with kmalloc_array thermal: cpu_cooling: Rearrange struct cpufreq_cooling_device thermal: cpu_cooling: 'freq' can't be zero in cpufreq_state2power() thermal: cpu_cooling: don't store cpu_dev in cpufreq_cdev thermal: cpu_cooling: get_level() can't fail thermal: cpu_cooling: create structure for idle time stats thermal: cpu_cooling: merge frequency and power tables thermal: cpu_cooling: get rid of 'allowed_cpus' thermal: cpu_cooling: OPPs are registered for all CPUs thermal: cpu_cooling: store cpufreq policy cpufreq: create cpufreq_table_count_valid_entries() thermal: cpu_cooling: use cpufreq_policy to register cooling device thermal: cpu_cooling: get rid of a variable in cpufreq_set_cur_state() thermal: cpu_cooling: remove cpufreq_cooling_get_level() ...

x86: use common aperfmperf_khz_on_cpu() to calculate KHz using APERF/MPERF

2017-06-26T23:47:32Z

The goal of this change is to give users a uniform and meaningful result when they read /sys/...cpufreq/scaling_cur_freq on modern x86 hardware, as compared to what they get today. Modern x86 processors include the hardware needed to accurately calculate frequency over an interval -- APERF, MPERF, and the TSC. Here we provide an x86 routine to make this calculation on supported hardware, and use it in preference to any driver driver-specific cpufreq_driver.get() routine. MHz is computed like so: MHz = base_MHz * delta_APERF / delta_MPERF MHz is the average frequency of the busy processor over a measurement interval. The interval is defined to be the time between successive invocations of aperfmperf_khz_on_cpu(), which are expected to to happen on-demand when users read sysfs attribute cpufreq/scaling_cur_freq. As with previous methods of calculating MHz, idle time is excluded. base_MHz above is from TSC calibration global "cpu_khz". This x86 native method to calculate MHz returns a meaningful result no matter if P-states are controlled by hardware or firmware and/or if the Linux cpufreq sub-system is or is-not installed. When this routine is invoked more frequently, the measurement interval becomes shorter. However, the code limits re-computation to 10ms intervals so that average frequency remains meaningful. Discerning users are encouraged to take advantage of the turbostat(8) utility, which can gracefully handle concurrent measurement intervals of arbitrary length. Signed-off-by: Len Brown Reviewed-by: Thomas Gleixner Signed-off-by: Rafael J. Wysocki

cpufreq: create cpufreq_table_count_valid_entries()

2017-05-28T00:32:28Z

We need such a routine at two places already, lets create one. Signed-off-by: Viresh Kumar Reviewed-by: Lukasz Luba Tested-by: Lukasz Luba Signed-off-by: Eduardo Valentin

cpufreq: schedutil: Use policy-dependent transition delays

2017-04-17T16:37:27Z

Make the schedutil governor take the initial (default) value of the rate_limit_us sysfs attribute from the (new) transition_delay_us policy parameter (to be set by the scaling driver). That will allow scaling drivers to make schedutil use smaller default values of rate_limit_us and reduce the default average time interval between consecutive frequency changes. Make intel_pstate set transition_delay_us to 500. Signed-off-by: Rafael J. Wysocki Acked-by: Viresh Kumar

cpufreq: Fix typos in comments

2017-02-03T23:47:59Z

- s/freqnency/frequency/ - s/accomodating/accommodating/ Signed-off-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki

cpufreq: Remove CPUFREQ_START notifier event

2017-02-03T23:05:30Z

Its not used anymore, remove it. Signed-off-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki

cpufreq: Remove policy create/remove notifiers

2017-02-03T22:59:38Z

Those were added by: commit fcd7af917abb ("cpufreq: stats: handle cpufreq_unregister_driver() and suspend/resume properly") but aren't used anymore since: commit 1aefc75b2449 ("cpufreq: stats: Make the stats code non-modular"). Remove them. Also remove the redundant parameter to the respective routines. Signed-off-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki

cpufreq: Make cpufreq_update_policy() void

2016-11-21T13:35:43Z

The return value of cpufreq_update_policy() is never used, so make it void. Signed-off-by: Rafael J. Wysocki Acked-by: Viresh Kumar

cpufreq: stats: New sysfs attribute for clearing statistics

2016-11-11T00:51:11Z

Allow CPUfreq statistics to be cleared by writing anything to /sys/.../cpufreq/stats/reset. Signed-off-by: Markus Mayer Acked-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki

cpufreq: fix overflow in cpufreq_table_find_index_dl()

2016-10-20T14:35:50Z

'best' is always less or equals to 'pos', so `best - pos' returns a negative value which is then getting casted to `unsigned int' and passed to __cpufreq_driver_target()->acpi_cpufreq_target() for policy->freq_table selection. This results in BUG: unable to handle kernel paging request at ffff881019b469f8 IP: [] acpi_cpufreq_target+0x4f/0x190 [acpi_cpufreq] PGD 267f067 PUD 0 Oops: 0000 [#1] PREEMPT SMP CPU: 6 PID: 70 Comm: kworker/6:1 Not tainted 4.9.0-rc1-next-20161017-dbg-dirty Workqueue: events dbs_work_handler task: ffff88041b808000 task.stack: ffff88041b810000 RIP: 0010:[] [] acpi_cpufreq_target+0x4f/0x190 [acpi_cpufreq] RSP: 0018:ffff88041b813c60 EFLAGS: 00010282 RAX: ffff880419b46a00 RBX: ffff88041b848400 RCX: ffff880419b20f80 RDX: 00000000001dff38 RSI: 00000000ffffffff RDI: ffff88041b848400 RBP: ffff88041b813cb0 R08: 0000000000000006 R09: 0000000000000040 R10: ffffffff8207f9e0 R11: ffffffff8173595b R12: 0000000000000000 R13: ffff88041f1dff38 R14: 0000000000262900 R15: 0000000bfffffff4 FS: 0000000000000000(0000) GS:ffff88041f000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff881019b469f8 CR3: 000000041a2d3000 CR4: 00000000001406e0 Stack: ffff88041b813cb0 ffffffff813347f9 ffff88041b813ca0 ffffffff81334663 ffff88041f1d4bc0 ffff88041b848400 0000000000000000 0000000000000000 0000000000262900 0000000000000000 ffff88041b813d00 ffffffff813355dc Call Trace: [] ? cpufreq_freq_transition_begin+0xf1/0xfc [] ? get_cpu_idle_time+0x97/0xa6 [] __cpufreq_driver_target+0x3b6/0x44e [] cs_dbs_timer+0x11a/0x135 [] dbs_work_handler+0x39/0x62 [] process_one_work+0x280/0x4a5 [] worker_thread+0x24f/0x397 [] ? rescuer_thread+0x30b/0x30b [] ? nl80211_get_key+0x29/0x36a [] kthread+0xfc/0x104 [] ? put_lock_stats.isra.9+0xe/0x20 [] ? kthread_create_on_node+0x3f/0x3f [] ret_from_fork+0x22/0x30 Code: 56 4d 6b ff 0c 41 55 41 54 53 48 83 ec 28 48 8b 15 ad 1e 00 00 44 8b 41 08 48 8b 87 c8 00 00 00 49 89 d5 4e 03 2c c5 80 b2 78 81 <46> 8b 74 38 04 45 3b 75 00 75 11 31 c0 83 39 00 0f 84 1c 01 00 RIP [] acpi_cpufreq_target+0x4f/0x190 [acpi_cpufreq] RSP CR2: ffff881019b469f8 ---[ end trace 16d9fc7a17897d37 ]--- [ rjw: In some cases this bug may also cause incorrect frequencies to be selected by cpufreq governors. ] Fixes: 899bb6642f2a (cpufreq: skip invalid entries when searching the frequency) Link: http://marc.info/?l=linux-kernel&m=147672030714331&w=2 Reported-and-tested-by: Sedat Dilek Reported-and-tested-by: Jörg Otte Signed-off-by: Sergey Senozhatsky Acked-by: Viresh Kumar Cc: 4.8+ # 4.8+ Signed-off-by: Rafael J. Wysocki