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![Kees Cook](/assets/img/avatar_default.png)
This refactors the only user of init_timer_pinned_deferrable() to use the new timer_setup() and from_timer(). Adds a pointer back to the policy, and drops the definition of init_timer_pinned_deferrable(). Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: linux-mips@linux-mips.org Cc: Petr Mladek <pmladek@suse.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Lai Jiangshan <jiangshanlai@gmail.com> Cc: Sebastian Reichel <sre@kernel.org> Cc: Kalle Valo <kvalo@qca.qualcomm.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Pavel Machek <pavel@ucw.cz> Cc: linux1394-devel@lists.sourceforge.net Cc: Chris Metcalf <cmetcalf@mellanox.com> Cc: linux-s390@vger.kernel.org Cc: linux-wireless@vger.kernel.org Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com> Cc: Wim Van Sebroeck <wim@iguana.be> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Ursula Braun <ubraun@linux.vnet.ibm.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Viresh Kumar <viresh.kumar@linaro.org> Cc: Harish Patil <harish.patil@cavium.com> Cc: Stephen Boyd <sboyd@codeaurora.org> Cc: Guenter Roeck <linux@roeck-us.net> Cc: Manish Chopra <manish.chopra@cavium.com> Cc: Len Brown <len.brown@intel.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: linux-pm@vger.kernel.org Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Tejun Heo <tj@kernel.org> Cc: Julian Wiedmann <jwi@linux.vnet.ibm.com> Cc: John Stultz <john.stultz@linaro.org> Cc: Mark Gross <mark.gross@intel.com> Cc: linux-watchdog@vger.kernel.org Cc: linux-scsi@vger.kernel.org Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Stefan Richter <stefanr@s5r6.in-berlin.de> Cc: Michael Reed <mdr@sgi.com> Cc: netdev@vger.kernel.org Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: linuxppc-dev@lists.ozlabs.org Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com> Link: https://lkml.kernel.org/r/1507159627-127660-3-git-send-email-keescook@chromium.org
1083 lines
29 KiB
C
1083 lines
29 KiB
C
/*
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* POWERNV cpufreq driver for the IBM POWER processors
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*
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* (C) Copyright IBM 2014
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*
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* Author: Vaidyanathan Srinivasan <svaidy at linux.vnet.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#define pr_fmt(fmt) "powernv-cpufreq: " fmt
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#include <linux/kernel.h>
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#include <linux/sysfs.h>
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#include <linux/cpumask.h>
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#include <linux/module.h>
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#include <linux/cpufreq.h>
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#include <linux/smp.h>
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#include <linux/of.h>
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#include <linux/reboot.h>
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#include <linux/slab.h>
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#include <linux/cpu.h>
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#include <trace/events/power.h>
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#include <asm/cputhreads.h>
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#include <asm/firmware.h>
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#include <asm/reg.h>
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#include <asm/smp.h> /* Required for cpu_sibling_mask() in UP configs */
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#include <asm/opal.h>
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#include <linux/timer.h>
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#define POWERNV_MAX_PSTATES 256
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#define PMSR_PSAFE_ENABLE (1UL << 30)
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#define PMSR_SPR_EM_DISABLE (1UL << 31)
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#define PMSR_MAX(x) ((x >> 32) & 0xFF)
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#define LPSTATE_SHIFT 48
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#define GPSTATE_SHIFT 56
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#define GET_LPSTATE(x) (((x) >> LPSTATE_SHIFT) & 0xFF)
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#define GET_GPSTATE(x) (((x) >> GPSTATE_SHIFT) & 0xFF)
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#define MAX_RAMP_DOWN_TIME 5120
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/*
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* On an idle system we want the global pstate to ramp-down from max value to
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* min over a span of ~5 secs. Also we want it to initially ramp-down slowly and
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* then ramp-down rapidly later on.
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*
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* This gives a percentage rampdown for time elapsed in milliseconds.
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* ramp_down_percentage = ((ms * ms) >> 18)
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* ~= 3.8 * (sec * sec)
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*
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* At 0 ms ramp_down_percent = 0
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* At 5120 ms ramp_down_percent = 100
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*/
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#define ramp_down_percent(time) ((time * time) >> 18)
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/* Interval after which the timer is queued to bring down global pstate */
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#define GPSTATE_TIMER_INTERVAL 2000
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/**
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* struct global_pstate_info - Per policy data structure to maintain history of
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* global pstates
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* @highest_lpstate_idx: The local pstate index from which we are
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* ramping down
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* @elapsed_time: Time in ms spent in ramping down from
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* highest_lpstate_idx
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* @last_sampled_time: Time from boot in ms when global pstates were
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* last set
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* @last_lpstate_idx, Last set value of local pstate and global
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* last_gpstate_idx pstate in terms of cpufreq table index
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* @timer: Is used for ramping down if cpu goes idle for
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* a long time with global pstate held high
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* @gpstate_lock: A spinlock to maintain synchronization between
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* routines called by the timer handler and
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* governer's target_index calls
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*/
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struct global_pstate_info {
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int highest_lpstate_idx;
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unsigned int elapsed_time;
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unsigned int last_sampled_time;
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int last_lpstate_idx;
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int last_gpstate_idx;
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spinlock_t gpstate_lock;
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struct timer_list timer;
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struct cpufreq_policy *policy;
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};
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static struct cpufreq_frequency_table powernv_freqs[POWERNV_MAX_PSTATES+1];
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static bool rebooting, throttled, occ_reset;
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static const char * const throttle_reason[] = {
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"No throttling",
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"Power Cap",
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"Processor Over Temperature",
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"Power Supply Failure",
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"Over Current",
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"OCC Reset"
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};
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enum throttle_reason_type {
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NO_THROTTLE = 0,
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POWERCAP,
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CPU_OVERTEMP,
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POWER_SUPPLY_FAILURE,
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OVERCURRENT,
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OCC_RESET_THROTTLE,
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OCC_MAX_REASON
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};
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static struct chip {
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unsigned int id;
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bool throttled;
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bool restore;
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u8 throttle_reason;
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cpumask_t mask;
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struct work_struct throttle;
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int throttle_turbo;
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int throttle_sub_turbo;
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int reason[OCC_MAX_REASON];
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} *chips;
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static int nr_chips;
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static DEFINE_PER_CPU(struct chip *, chip_info);
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/*
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* Note:
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* The set of pstates consists of contiguous integers.
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* powernv_pstate_info stores the index of the frequency table for
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* max, min and nominal frequencies. It also stores number of
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* available frequencies.
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*
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* powernv_pstate_info.nominal indicates the index to the highest
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* non-turbo frequency.
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*/
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static struct powernv_pstate_info {
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unsigned int min;
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unsigned int max;
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unsigned int nominal;
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unsigned int nr_pstates;
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bool wof_enabled;
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} powernv_pstate_info;
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/* Use following macros for conversions between pstate_id and index */
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static inline int idx_to_pstate(unsigned int i)
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{
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if (unlikely(i >= powernv_pstate_info.nr_pstates)) {
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pr_warn_once("index %u is out of bound\n", i);
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return powernv_freqs[powernv_pstate_info.nominal].driver_data;
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}
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return powernv_freqs[i].driver_data;
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}
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static inline unsigned int pstate_to_idx(int pstate)
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{
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int min = powernv_freqs[powernv_pstate_info.min].driver_data;
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int max = powernv_freqs[powernv_pstate_info.max].driver_data;
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if (min > 0) {
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if (unlikely((pstate < max) || (pstate > min))) {
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pr_warn_once("pstate %d is out of bound\n", pstate);
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return powernv_pstate_info.nominal;
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}
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} else {
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if (unlikely((pstate > max) || (pstate < min))) {
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pr_warn_once("pstate %d is out of bound\n", pstate);
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return powernv_pstate_info.nominal;
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}
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}
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/*
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* abs() is deliberately used so that is works with
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* both monotonically increasing and decreasing
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* pstate values
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*/
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return abs(pstate - idx_to_pstate(powernv_pstate_info.max));
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}
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static inline void reset_gpstates(struct cpufreq_policy *policy)
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{
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struct global_pstate_info *gpstates = policy->driver_data;
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gpstates->highest_lpstate_idx = 0;
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gpstates->elapsed_time = 0;
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gpstates->last_sampled_time = 0;
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gpstates->last_lpstate_idx = 0;
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gpstates->last_gpstate_idx = 0;
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}
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/*
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* Initialize the freq table based on data obtained
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* from the firmware passed via device-tree
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*/
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static int init_powernv_pstates(void)
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{
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struct device_node *power_mgt;
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int i, nr_pstates = 0;
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const __be32 *pstate_ids, *pstate_freqs;
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u32 len_ids, len_freqs;
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u32 pstate_min, pstate_max, pstate_nominal;
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u32 pstate_turbo, pstate_ultra_turbo;
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power_mgt = of_find_node_by_path("/ibm,opal/power-mgt");
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if (!power_mgt) {
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pr_warn("power-mgt node not found\n");
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return -ENODEV;
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}
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if (of_property_read_u32(power_mgt, "ibm,pstate-min", &pstate_min)) {
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pr_warn("ibm,pstate-min node not found\n");
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return -ENODEV;
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}
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if (of_property_read_u32(power_mgt, "ibm,pstate-max", &pstate_max)) {
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pr_warn("ibm,pstate-max node not found\n");
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return -ENODEV;
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}
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if (of_property_read_u32(power_mgt, "ibm,pstate-nominal",
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&pstate_nominal)) {
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pr_warn("ibm,pstate-nominal not found\n");
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return -ENODEV;
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}
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if (of_property_read_u32(power_mgt, "ibm,pstate-ultra-turbo",
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&pstate_ultra_turbo)) {
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powernv_pstate_info.wof_enabled = false;
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goto next;
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}
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if (of_property_read_u32(power_mgt, "ibm,pstate-turbo",
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&pstate_turbo)) {
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powernv_pstate_info.wof_enabled = false;
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goto next;
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}
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if (pstate_turbo == pstate_ultra_turbo)
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powernv_pstate_info.wof_enabled = false;
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else
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powernv_pstate_info.wof_enabled = true;
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next:
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pr_info("cpufreq pstate min %d nominal %d max %d\n", pstate_min,
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pstate_nominal, pstate_max);
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pr_info("Workload Optimized Frequency is %s in the platform\n",
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(powernv_pstate_info.wof_enabled) ? "enabled" : "disabled");
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pstate_ids = of_get_property(power_mgt, "ibm,pstate-ids", &len_ids);
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if (!pstate_ids) {
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pr_warn("ibm,pstate-ids not found\n");
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return -ENODEV;
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}
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pstate_freqs = of_get_property(power_mgt, "ibm,pstate-frequencies-mhz",
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&len_freqs);
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if (!pstate_freqs) {
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pr_warn("ibm,pstate-frequencies-mhz not found\n");
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return -ENODEV;
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}
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if (len_ids != len_freqs) {
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pr_warn("Entries in ibm,pstate-ids and "
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"ibm,pstate-frequencies-mhz does not match\n");
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}
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nr_pstates = min(len_ids, len_freqs) / sizeof(u32);
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if (!nr_pstates) {
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pr_warn("No PStates found\n");
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return -ENODEV;
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}
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powernv_pstate_info.nr_pstates = nr_pstates;
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pr_debug("NR PStates %d\n", nr_pstates);
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for (i = 0; i < nr_pstates; i++) {
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u32 id = be32_to_cpu(pstate_ids[i]);
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u32 freq = be32_to_cpu(pstate_freqs[i]);
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pr_debug("PState id %d freq %d MHz\n", id, freq);
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powernv_freqs[i].frequency = freq * 1000; /* kHz */
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powernv_freqs[i].driver_data = id;
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if (id == pstate_max)
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powernv_pstate_info.max = i;
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else if (id == pstate_nominal)
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powernv_pstate_info.nominal = i;
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else if (id == pstate_min)
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powernv_pstate_info.min = i;
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if (powernv_pstate_info.wof_enabled && id == pstate_turbo) {
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int j;
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for (j = i - 1; j >= (int)powernv_pstate_info.max; j--)
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powernv_freqs[j].flags = CPUFREQ_BOOST_FREQ;
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}
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}
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/* End of list marker entry */
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powernv_freqs[i].frequency = CPUFREQ_TABLE_END;
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return 0;
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}
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/* Returns the CPU frequency corresponding to the pstate_id. */
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static unsigned int pstate_id_to_freq(int pstate_id)
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{
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int i;
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i = pstate_to_idx(pstate_id);
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if (i >= powernv_pstate_info.nr_pstates || i < 0) {
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pr_warn("PState id %d outside of PState table, "
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"reporting nominal id %d instead\n",
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pstate_id, idx_to_pstate(powernv_pstate_info.nominal));
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i = powernv_pstate_info.nominal;
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}
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return powernv_freqs[i].frequency;
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}
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/*
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* cpuinfo_nominal_freq_show - Show the nominal CPU frequency as indicated by
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* the firmware
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*/
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static ssize_t cpuinfo_nominal_freq_show(struct cpufreq_policy *policy,
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char *buf)
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{
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return sprintf(buf, "%u\n",
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powernv_freqs[powernv_pstate_info.nominal].frequency);
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}
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struct freq_attr cpufreq_freq_attr_cpuinfo_nominal_freq =
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__ATTR_RO(cpuinfo_nominal_freq);
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#define SCALING_BOOST_FREQS_ATTR_INDEX 2
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static struct freq_attr *powernv_cpu_freq_attr[] = {
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&cpufreq_freq_attr_scaling_available_freqs,
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&cpufreq_freq_attr_cpuinfo_nominal_freq,
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&cpufreq_freq_attr_scaling_boost_freqs,
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NULL,
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};
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#define throttle_attr(name, member) \
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static ssize_t name##_show(struct cpufreq_policy *policy, char *buf) \
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{ \
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struct chip *chip = per_cpu(chip_info, policy->cpu); \
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\
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return sprintf(buf, "%u\n", chip->member); \
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} \
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\
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static struct freq_attr throttle_attr_##name = __ATTR_RO(name) \
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throttle_attr(unthrottle, reason[NO_THROTTLE]);
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throttle_attr(powercap, reason[POWERCAP]);
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throttle_attr(overtemp, reason[CPU_OVERTEMP]);
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throttle_attr(supply_fault, reason[POWER_SUPPLY_FAILURE]);
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throttle_attr(overcurrent, reason[OVERCURRENT]);
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throttle_attr(occ_reset, reason[OCC_RESET_THROTTLE]);
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throttle_attr(turbo_stat, throttle_turbo);
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throttle_attr(sub_turbo_stat, throttle_sub_turbo);
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static struct attribute *throttle_attrs[] = {
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&throttle_attr_unthrottle.attr,
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&throttle_attr_powercap.attr,
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&throttle_attr_overtemp.attr,
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&throttle_attr_supply_fault.attr,
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&throttle_attr_overcurrent.attr,
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&throttle_attr_occ_reset.attr,
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&throttle_attr_turbo_stat.attr,
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&throttle_attr_sub_turbo_stat.attr,
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NULL,
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};
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static const struct attribute_group throttle_attr_grp = {
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.name = "throttle_stats",
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.attrs = throttle_attrs,
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};
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/* Helper routines */
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/* Access helpers to power mgt SPR */
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static inline unsigned long get_pmspr(unsigned long sprn)
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{
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switch (sprn) {
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case SPRN_PMCR:
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return mfspr(SPRN_PMCR);
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case SPRN_PMICR:
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return mfspr(SPRN_PMICR);
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case SPRN_PMSR:
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return mfspr(SPRN_PMSR);
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}
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BUG();
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}
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static inline void set_pmspr(unsigned long sprn, unsigned long val)
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{
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switch (sprn) {
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case SPRN_PMCR:
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mtspr(SPRN_PMCR, val);
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return;
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case SPRN_PMICR:
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mtspr(SPRN_PMICR, val);
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return;
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}
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BUG();
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}
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/*
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* Use objects of this type to query/update
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* pstates on a remote CPU via smp_call_function.
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*/
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struct powernv_smp_call_data {
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unsigned int freq;
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int pstate_id;
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int gpstate_id;
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};
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/*
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* powernv_read_cpu_freq: Reads the current frequency on this CPU.
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*
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* Called via smp_call_function.
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*
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* Note: The caller of the smp_call_function should pass an argument of
|
|
* the type 'struct powernv_smp_call_data *' along with this function.
|
|
*
|
|
* The current frequency on this CPU will be returned via
|
|
* ((struct powernv_smp_call_data *)arg)->freq;
|
|
*/
|
|
static void powernv_read_cpu_freq(void *arg)
|
|
{
|
|
unsigned long pmspr_val;
|
|
s8 local_pstate_id;
|
|
struct powernv_smp_call_data *freq_data = arg;
|
|
|
|
pmspr_val = get_pmspr(SPRN_PMSR);
|
|
|
|
/*
|
|
* The local pstate id corresponds bits 48..55 in the PMSR.
|
|
* Note: Watch out for the sign!
|
|
*/
|
|
local_pstate_id = (pmspr_val >> 48) & 0xFF;
|
|
freq_data->pstate_id = local_pstate_id;
|
|
freq_data->freq = pstate_id_to_freq(freq_data->pstate_id);
|
|
|
|
pr_debug("cpu %d pmsr %016lX pstate_id %d frequency %d kHz\n",
|
|
raw_smp_processor_id(), pmspr_val, freq_data->pstate_id,
|
|
freq_data->freq);
|
|
}
|
|
|
|
/*
|
|
* powernv_cpufreq_get: Returns the CPU frequency as reported by the
|
|
* firmware for CPU 'cpu'. This value is reported through the sysfs
|
|
* file cpuinfo_cur_freq.
|
|
*/
|
|
static unsigned int powernv_cpufreq_get(unsigned int cpu)
|
|
{
|
|
struct powernv_smp_call_data freq_data;
|
|
|
|
smp_call_function_any(cpu_sibling_mask(cpu), powernv_read_cpu_freq,
|
|
&freq_data, 1);
|
|
|
|
return freq_data.freq;
|
|
}
|
|
|
|
/*
|
|
* set_pstate: Sets the pstate on this CPU.
|
|
*
|
|
* This is called via an smp_call_function.
|
|
*
|
|
* The caller must ensure that freq_data is of the type
|
|
* (struct powernv_smp_call_data *) and the pstate_id which needs to be set
|
|
* on this CPU should be present in freq_data->pstate_id.
|
|
*/
|
|
static void set_pstate(void *data)
|
|
{
|
|
unsigned long val;
|
|
struct powernv_smp_call_data *freq_data = data;
|
|
unsigned long pstate_ul = freq_data->pstate_id;
|
|
unsigned long gpstate_ul = freq_data->gpstate_id;
|
|
|
|
val = get_pmspr(SPRN_PMCR);
|
|
val = val & 0x0000FFFFFFFFFFFFULL;
|
|
|
|
pstate_ul = pstate_ul & 0xFF;
|
|
gpstate_ul = gpstate_ul & 0xFF;
|
|
|
|
/* Set both global(bits 56..63) and local(bits 48..55) PStates */
|
|
val = val | (gpstate_ul << 56) | (pstate_ul << 48);
|
|
|
|
pr_debug("Setting cpu %d pmcr to %016lX\n",
|
|
raw_smp_processor_id(), val);
|
|
set_pmspr(SPRN_PMCR, val);
|
|
}
|
|
|
|
/*
|
|
* get_nominal_index: Returns the index corresponding to the nominal
|
|
* pstate in the cpufreq table
|
|
*/
|
|
static inline unsigned int get_nominal_index(void)
|
|
{
|
|
return powernv_pstate_info.nominal;
|
|
}
|
|
|
|
static void powernv_cpufreq_throttle_check(void *data)
|
|
{
|
|
struct chip *chip;
|
|
unsigned int cpu = smp_processor_id();
|
|
unsigned long pmsr;
|
|
int pmsr_pmax;
|
|
unsigned int pmsr_pmax_idx;
|
|
|
|
pmsr = get_pmspr(SPRN_PMSR);
|
|
chip = this_cpu_read(chip_info);
|
|
|
|
/* Check for Pmax Capping */
|
|
pmsr_pmax = (s8)PMSR_MAX(pmsr);
|
|
pmsr_pmax_idx = pstate_to_idx(pmsr_pmax);
|
|
if (pmsr_pmax_idx != powernv_pstate_info.max) {
|
|
if (chip->throttled)
|
|
goto next;
|
|
chip->throttled = true;
|
|
if (pmsr_pmax_idx > powernv_pstate_info.nominal) {
|
|
pr_warn_once("CPU %d on Chip %u has Pmax(%d) reduced below nominal frequency(%d)\n",
|
|
cpu, chip->id, pmsr_pmax,
|
|
idx_to_pstate(powernv_pstate_info.nominal));
|
|
chip->throttle_sub_turbo++;
|
|
} else {
|
|
chip->throttle_turbo++;
|
|
}
|
|
trace_powernv_throttle(chip->id,
|
|
throttle_reason[chip->throttle_reason],
|
|
pmsr_pmax);
|
|
} else if (chip->throttled) {
|
|
chip->throttled = false;
|
|
trace_powernv_throttle(chip->id,
|
|
throttle_reason[chip->throttle_reason],
|
|
pmsr_pmax);
|
|
}
|
|
|
|
/* Check if Psafe_mode_active is set in PMSR. */
|
|
next:
|
|
if (pmsr & PMSR_PSAFE_ENABLE) {
|
|
throttled = true;
|
|
pr_info("Pstate set to safe frequency\n");
|
|
}
|
|
|
|
/* Check if SPR_EM_DISABLE is set in PMSR */
|
|
if (pmsr & PMSR_SPR_EM_DISABLE) {
|
|
throttled = true;
|
|
pr_info("Frequency Control disabled from OS\n");
|
|
}
|
|
|
|
if (throttled) {
|
|
pr_info("PMSR = %16lx\n", pmsr);
|
|
pr_warn("CPU Frequency could be throttled\n");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* calc_global_pstate - Calculate global pstate
|
|
* @elapsed_time: Elapsed time in milliseconds
|
|
* @local_pstate_idx: New local pstate
|
|
* @highest_lpstate_idx: pstate from which its ramping down
|
|
*
|
|
* Finds the appropriate global pstate based on the pstate from which its
|
|
* ramping down and the time elapsed in ramping down. It follows a quadratic
|
|
* equation which ensures that it reaches ramping down to pmin in 5sec.
|
|
*/
|
|
static inline int calc_global_pstate(unsigned int elapsed_time,
|
|
int highest_lpstate_idx,
|
|
int local_pstate_idx)
|
|
{
|
|
int index_diff;
|
|
|
|
/*
|
|
* Using ramp_down_percent we get the percentage of rampdown
|
|
* that we are expecting to be dropping. Difference between
|
|
* highest_lpstate_idx and powernv_pstate_info.min will give a absolute
|
|
* number of how many pstates we will drop eventually by the end of
|
|
* 5 seconds, then just scale it get the number pstates to be dropped.
|
|
*/
|
|
index_diff = ((int)ramp_down_percent(elapsed_time) *
|
|
(powernv_pstate_info.min - highest_lpstate_idx)) / 100;
|
|
|
|
/* Ensure that global pstate is >= to local pstate */
|
|
if (highest_lpstate_idx + index_diff >= local_pstate_idx)
|
|
return local_pstate_idx;
|
|
else
|
|
return highest_lpstate_idx + index_diff;
|
|
}
|
|
|
|
static inline void queue_gpstate_timer(struct global_pstate_info *gpstates)
|
|
{
|
|
unsigned int timer_interval;
|
|
|
|
/*
|
|
* Setting up timer to fire after GPSTATE_TIMER_INTERVAL ms, But
|
|
* if it exceeds MAX_RAMP_DOWN_TIME ms for ramp down time.
|
|
* Set timer such that it fires exactly at MAX_RAMP_DOWN_TIME
|
|
* seconds of ramp down time.
|
|
*/
|
|
if ((gpstates->elapsed_time + GPSTATE_TIMER_INTERVAL)
|
|
> MAX_RAMP_DOWN_TIME)
|
|
timer_interval = MAX_RAMP_DOWN_TIME - gpstates->elapsed_time;
|
|
else
|
|
timer_interval = GPSTATE_TIMER_INTERVAL;
|
|
|
|
mod_timer(&gpstates->timer, jiffies + msecs_to_jiffies(timer_interval));
|
|
}
|
|
|
|
/**
|
|
* gpstate_timer_handler
|
|
*
|
|
* @data: pointer to cpufreq_policy on which timer was queued
|
|
*
|
|
* This handler brings down the global pstate closer to the local pstate
|
|
* according quadratic equation. Queues a new timer if it is still not equal
|
|
* to local pstate
|
|
*/
|
|
void gpstate_timer_handler(struct timer_list *t)
|
|
{
|
|
struct global_pstate_info *gpstates = from_timer(gpstates, t, timer);
|
|
struct cpufreq_policy *policy = gpstates->policy;
|
|
int gpstate_idx, lpstate_idx;
|
|
unsigned long val;
|
|
unsigned int time_diff = jiffies_to_msecs(jiffies)
|
|
- gpstates->last_sampled_time;
|
|
struct powernv_smp_call_data freq_data;
|
|
|
|
if (!spin_trylock(&gpstates->gpstate_lock))
|
|
return;
|
|
|
|
/*
|
|
* If PMCR was last updated was using fast_swtich then
|
|
* We may have wrong in gpstate->last_lpstate_idx
|
|
* value. Hence, read from PMCR to get correct data.
|
|
*/
|
|
val = get_pmspr(SPRN_PMCR);
|
|
freq_data.gpstate_id = (s8)GET_GPSTATE(val);
|
|
freq_data.pstate_id = (s8)GET_LPSTATE(val);
|
|
if (freq_data.gpstate_id == freq_data.pstate_id) {
|
|
reset_gpstates(policy);
|
|
spin_unlock(&gpstates->gpstate_lock);
|
|
return;
|
|
}
|
|
|
|
gpstates->last_sampled_time += time_diff;
|
|
gpstates->elapsed_time += time_diff;
|
|
|
|
if (gpstates->elapsed_time > MAX_RAMP_DOWN_TIME) {
|
|
gpstate_idx = pstate_to_idx(freq_data.pstate_id);
|
|
lpstate_idx = gpstate_idx;
|
|
reset_gpstates(policy);
|
|
gpstates->highest_lpstate_idx = gpstate_idx;
|
|
} else {
|
|
lpstate_idx = pstate_to_idx(freq_data.pstate_id);
|
|
gpstate_idx = calc_global_pstate(gpstates->elapsed_time,
|
|
gpstates->highest_lpstate_idx,
|
|
lpstate_idx);
|
|
}
|
|
freq_data.gpstate_id = idx_to_pstate(gpstate_idx);
|
|
gpstates->last_gpstate_idx = gpstate_idx;
|
|
gpstates->last_lpstate_idx = lpstate_idx;
|
|
/*
|
|
* If local pstate is equal to global pstate, rampdown is over
|
|
* So timer is not required to be queued.
|
|
*/
|
|
if (gpstate_idx != gpstates->last_lpstate_idx)
|
|
queue_gpstate_timer(gpstates);
|
|
|
|
spin_unlock(&gpstates->gpstate_lock);
|
|
|
|
/* Timer may get migrated to a different cpu on cpu hot unplug */
|
|
smp_call_function_any(policy->cpus, set_pstate, &freq_data, 1);
|
|
}
|
|
|
|
/*
|
|
* powernv_cpufreq_target_index: Sets the frequency corresponding to
|
|
* the cpufreq table entry indexed by new_index on the cpus in the
|
|
* mask policy->cpus
|
|
*/
|
|
static int powernv_cpufreq_target_index(struct cpufreq_policy *policy,
|
|
unsigned int new_index)
|
|
{
|
|
struct powernv_smp_call_data freq_data;
|
|
unsigned int cur_msec, gpstate_idx;
|
|
struct global_pstate_info *gpstates = policy->driver_data;
|
|
|
|
if (unlikely(rebooting) && new_index != get_nominal_index())
|
|
return 0;
|
|
|
|
if (!throttled) {
|
|
/* we don't want to be preempted while
|
|
* checking if the CPU frequency has been throttled
|
|
*/
|
|
preempt_disable();
|
|
powernv_cpufreq_throttle_check(NULL);
|
|
preempt_enable();
|
|
}
|
|
|
|
cur_msec = jiffies_to_msecs(get_jiffies_64());
|
|
|
|
spin_lock(&gpstates->gpstate_lock);
|
|
freq_data.pstate_id = idx_to_pstate(new_index);
|
|
|
|
if (!gpstates->last_sampled_time) {
|
|
gpstate_idx = new_index;
|
|
gpstates->highest_lpstate_idx = new_index;
|
|
goto gpstates_done;
|
|
}
|
|
|
|
if (gpstates->last_gpstate_idx < new_index) {
|
|
gpstates->elapsed_time += cur_msec -
|
|
gpstates->last_sampled_time;
|
|
|
|
/*
|
|
* If its has been ramping down for more than MAX_RAMP_DOWN_TIME
|
|
* we should be resetting all global pstate related data. Set it
|
|
* equal to local pstate to start fresh.
|
|
*/
|
|
if (gpstates->elapsed_time > MAX_RAMP_DOWN_TIME) {
|
|
reset_gpstates(policy);
|
|
gpstates->highest_lpstate_idx = new_index;
|
|
gpstate_idx = new_index;
|
|
} else {
|
|
/* Elaspsed_time is less than 5 seconds, continue to rampdown */
|
|
gpstate_idx = calc_global_pstate(gpstates->elapsed_time,
|
|
gpstates->highest_lpstate_idx,
|
|
new_index);
|
|
}
|
|
} else {
|
|
reset_gpstates(policy);
|
|
gpstates->highest_lpstate_idx = new_index;
|
|
gpstate_idx = new_index;
|
|
}
|
|
|
|
/*
|
|
* If local pstate is equal to global pstate, rampdown is over
|
|
* So timer is not required to be queued.
|
|
*/
|
|
if (gpstate_idx != new_index)
|
|
queue_gpstate_timer(gpstates);
|
|
else
|
|
del_timer_sync(&gpstates->timer);
|
|
|
|
gpstates_done:
|
|
freq_data.gpstate_id = idx_to_pstate(gpstate_idx);
|
|
gpstates->last_sampled_time = cur_msec;
|
|
gpstates->last_gpstate_idx = gpstate_idx;
|
|
gpstates->last_lpstate_idx = new_index;
|
|
|
|
spin_unlock(&gpstates->gpstate_lock);
|
|
|
|
/*
|
|
* Use smp_call_function to send IPI and execute the
|
|
* mtspr on target CPU. We could do that without IPI
|
|
* if current CPU is within policy->cpus (core)
|
|
*/
|
|
smp_call_function_any(policy->cpus, set_pstate, &freq_data, 1);
|
|
return 0;
|
|
}
|
|
|
|
static int powernv_cpufreq_cpu_init(struct cpufreq_policy *policy)
|
|
{
|
|
int base, i, ret;
|
|
struct kernfs_node *kn;
|
|
struct global_pstate_info *gpstates;
|
|
|
|
base = cpu_first_thread_sibling(policy->cpu);
|
|
|
|
for (i = 0; i < threads_per_core; i++)
|
|
cpumask_set_cpu(base + i, policy->cpus);
|
|
|
|
kn = kernfs_find_and_get(policy->kobj.sd, throttle_attr_grp.name);
|
|
if (!kn) {
|
|
int ret;
|
|
|
|
ret = sysfs_create_group(&policy->kobj, &throttle_attr_grp);
|
|
if (ret) {
|
|
pr_info("Failed to create throttle stats directory for cpu %d\n",
|
|
policy->cpu);
|
|
return ret;
|
|
}
|
|
} else {
|
|
kernfs_put(kn);
|
|
}
|
|
|
|
gpstates = kzalloc(sizeof(*gpstates), GFP_KERNEL);
|
|
if (!gpstates)
|
|
return -ENOMEM;
|
|
|
|
policy->driver_data = gpstates;
|
|
|
|
/* initialize timer */
|
|
gpstates->policy = policy;
|
|
timer_setup(&gpstates->timer, gpstate_timer_handler,
|
|
TIMER_PINNED | TIMER_DEFERRABLE);
|
|
gpstates->timer.expires = jiffies +
|
|
msecs_to_jiffies(GPSTATE_TIMER_INTERVAL);
|
|
spin_lock_init(&gpstates->gpstate_lock);
|
|
ret = cpufreq_table_validate_and_show(policy, powernv_freqs);
|
|
|
|
if (ret < 0) {
|
|
kfree(policy->driver_data);
|
|
return ret;
|
|
}
|
|
|
|
policy->fast_switch_possible = true;
|
|
return ret;
|
|
}
|
|
|
|
static int powernv_cpufreq_cpu_exit(struct cpufreq_policy *policy)
|
|
{
|
|
/* timer is deleted in cpufreq_cpu_stop() */
|
|
kfree(policy->driver_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int powernv_cpufreq_reboot_notifier(struct notifier_block *nb,
|
|
unsigned long action, void *unused)
|
|
{
|
|
int cpu;
|
|
struct cpufreq_policy cpu_policy;
|
|
|
|
rebooting = true;
|
|
for_each_online_cpu(cpu) {
|
|
cpufreq_get_policy(&cpu_policy, cpu);
|
|
powernv_cpufreq_target_index(&cpu_policy, get_nominal_index());
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block powernv_cpufreq_reboot_nb = {
|
|
.notifier_call = powernv_cpufreq_reboot_notifier,
|
|
};
|
|
|
|
void powernv_cpufreq_work_fn(struct work_struct *work)
|
|
{
|
|
struct chip *chip = container_of(work, struct chip, throttle);
|
|
unsigned int cpu;
|
|
cpumask_t mask;
|
|
|
|
get_online_cpus();
|
|
cpumask_and(&mask, &chip->mask, cpu_online_mask);
|
|
smp_call_function_any(&mask,
|
|
powernv_cpufreq_throttle_check, NULL, 0);
|
|
|
|
if (!chip->restore)
|
|
goto out;
|
|
|
|
chip->restore = false;
|
|
for_each_cpu(cpu, &mask) {
|
|
int index;
|
|
struct cpufreq_policy policy;
|
|
|
|
cpufreq_get_policy(&policy, cpu);
|
|
index = cpufreq_table_find_index_c(&policy, policy.cur);
|
|
powernv_cpufreq_target_index(&policy, index);
|
|
cpumask_andnot(&mask, &mask, policy.cpus);
|
|
}
|
|
out:
|
|
put_online_cpus();
|
|
}
|
|
|
|
static int powernv_cpufreq_occ_msg(struct notifier_block *nb,
|
|
unsigned long msg_type, void *_msg)
|
|
{
|
|
struct opal_msg *msg = _msg;
|
|
struct opal_occ_msg omsg;
|
|
int i;
|
|
|
|
if (msg_type != OPAL_MSG_OCC)
|
|
return 0;
|
|
|
|
omsg.type = be64_to_cpu(msg->params[0]);
|
|
|
|
switch (omsg.type) {
|
|
case OCC_RESET:
|
|
occ_reset = true;
|
|
pr_info("OCC (On Chip Controller - enforces hard thermal/power limits) Resetting\n");
|
|
/*
|
|
* powernv_cpufreq_throttle_check() is called in
|
|
* target() callback which can detect the throttle state
|
|
* for governors like ondemand.
|
|
* But static governors will not call target() often thus
|
|
* report throttling here.
|
|
*/
|
|
if (!throttled) {
|
|
throttled = true;
|
|
pr_warn("CPU frequency is throttled for duration\n");
|
|
}
|
|
|
|
break;
|
|
case OCC_LOAD:
|
|
pr_info("OCC Loading, CPU frequency is throttled until OCC is started\n");
|
|
break;
|
|
case OCC_THROTTLE:
|
|
omsg.chip = be64_to_cpu(msg->params[1]);
|
|
omsg.throttle_status = be64_to_cpu(msg->params[2]);
|
|
|
|
if (occ_reset) {
|
|
occ_reset = false;
|
|
throttled = false;
|
|
pr_info("OCC Active, CPU frequency is no longer throttled\n");
|
|
|
|
for (i = 0; i < nr_chips; i++) {
|
|
chips[i].restore = true;
|
|
schedule_work(&chips[i].throttle);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
for (i = 0; i < nr_chips; i++)
|
|
if (chips[i].id == omsg.chip)
|
|
break;
|
|
|
|
if (omsg.throttle_status >= 0 &&
|
|
omsg.throttle_status <= OCC_MAX_THROTTLE_STATUS) {
|
|
chips[i].throttle_reason = omsg.throttle_status;
|
|
chips[i].reason[omsg.throttle_status]++;
|
|
}
|
|
|
|
if (!omsg.throttle_status)
|
|
chips[i].restore = true;
|
|
|
|
schedule_work(&chips[i].throttle);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct notifier_block powernv_cpufreq_opal_nb = {
|
|
.notifier_call = powernv_cpufreq_occ_msg,
|
|
.next = NULL,
|
|
.priority = 0,
|
|
};
|
|
|
|
static void powernv_cpufreq_stop_cpu(struct cpufreq_policy *policy)
|
|
{
|
|
struct powernv_smp_call_data freq_data;
|
|
struct global_pstate_info *gpstates = policy->driver_data;
|
|
|
|
freq_data.pstate_id = idx_to_pstate(powernv_pstate_info.min);
|
|
freq_data.gpstate_id = idx_to_pstate(powernv_pstate_info.min);
|
|
smp_call_function_single(policy->cpu, set_pstate, &freq_data, 1);
|
|
del_timer_sync(&gpstates->timer);
|
|
}
|
|
|
|
static unsigned int powernv_fast_switch(struct cpufreq_policy *policy,
|
|
unsigned int target_freq)
|
|
{
|
|
int index;
|
|
struct powernv_smp_call_data freq_data;
|
|
|
|
index = cpufreq_table_find_index_dl(policy, target_freq);
|
|
freq_data.pstate_id = powernv_freqs[index].driver_data;
|
|
freq_data.gpstate_id = powernv_freqs[index].driver_data;
|
|
set_pstate(&freq_data);
|
|
|
|
return powernv_freqs[index].frequency;
|
|
}
|
|
|
|
static struct cpufreq_driver powernv_cpufreq_driver = {
|
|
.name = "powernv-cpufreq",
|
|
.flags = CPUFREQ_CONST_LOOPS,
|
|
.init = powernv_cpufreq_cpu_init,
|
|
.exit = powernv_cpufreq_cpu_exit,
|
|
.verify = cpufreq_generic_frequency_table_verify,
|
|
.target_index = powernv_cpufreq_target_index,
|
|
.fast_switch = powernv_fast_switch,
|
|
.get = powernv_cpufreq_get,
|
|
.stop_cpu = powernv_cpufreq_stop_cpu,
|
|
.attr = powernv_cpu_freq_attr,
|
|
};
|
|
|
|
static int init_chip_info(void)
|
|
{
|
|
unsigned int chip[256];
|
|
unsigned int cpu, i;
|
|
unsigned int prev_chip_id = UINT_MAX;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
unsigned int id = cpu_to_chip_id(cpu);
|
|
|
|
if (prev_chip_id != id) {
|
|
prev_chip_id = id;
|
|
chip[nr_chips++] = id;
|
|
}
|
|
}
|
|
|
|
chips = kcalloc(nr_chips, sizeof(struct chip), GFP_KERNEL);
|
|
if (!chips)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < nr_chips; i++) {
|
|
chips[i].id = chip[i];
|
|
cpumask_copy(&chips[i].mask, cpumask_of_node(chip[i]));
|
|
INIT_WORK(&chips[i].throttle, powernv_cpufreq_work_fn);
|
|
for_each_cpu(cpu, &chips[i].mask)
|
|
per_cpu(chip_info, cpu) = &chips[i];
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void clean_chip_info(void)
|
|
{
|
|
kfree(chips);
|
|
}
|
|
|
|
static inline void unregister_all_notifiers(void)
|
|
{
|
|
opal_message_notifier_unregister(OPAL_MSG_OCC,
|
|
&powernv_cpufreq_opal_nb);
|
|
unregister_reboot_notifier(&powernv_cpufreq_reboot_nb);
|
|
}
|
|
|
|
static int __init powernv_cpufreq_init(void)
|
|
{
|
|
int rc = 0;
|
|
|
|
/* Don't probe on pseries (guest) platforms */
|
|
if (!firmware_has_feature(FW_FEATURE_OPAL))
|
|
return -ENODEV;
|
|
|
|
/* Discover pstates from device tree and init */
|
|
rc = init_powernv_pstates();
|
|
if (rc)
|
|
goto out;
|
|
|
|
/* Populate chip info */
|
|
rc = init_chip_info();
|
|
if (rc)
|
|
goto out;
|
|
|
|
register_reboot_notifier(&powernv_cpufreq_reboot_nb);
|
|
opal_message_notifier_register(OPAL_MSG_OCC, &powernv_cpufreq_opal_nb);
|
|
|
|
if (powernv_pstate_info.wof_enabled)
|
|
powernv_cpufreq_driver.boost_enabled = true;
|
|
else
|
|
powernv_cpu_freq_attr[SCALING_BOOST_FREQS_ATTR_INDEX] = NULL;
|
|
|
|
rc = cpufreq_register_driver(&powernv_cpufreq_driver);
|
|
if (rc) {
|
|
pr_info("Failed to register the cpufreq driver (%d)\n", rc);
|
|
goto cleanup_notifiers;
|
|
}
|
|
|
|
if (powernv_pstate_info.wof_enabled)
|
|
cpufreq_enable_boost_support();
|
|
|
|
return 0;
|
|
cleanup_notifiers:
|
|
unregister_all_notifiers();
|
|
clean_chip_info();
|
|
out:
|
|
pr_info("Platform driver disabled. System does not support PState control\n");
|
|
return rc;
|
|
}
|
|
module_init(powernv_cpufreq_init);
|
|
|
|
static void __exit powernv_cpufreq_exit(void)
|
|
{
|
|
cpufreq_unregister_driver(&powernv_cpufreq_driver);
|
|
unregister_all_notifiers();
|
|
clean_chip_info();
|
|
}
|
|
module_exit(powernv_cpufreq_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Vaidyanathan Srinivasan <svaidy at linux.vnet.ibm.com>");
|