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![Linus Torvalds](/assets/img/avatar_default.png)
- Convert pseries & powernv to use MSI IRQ domains. - Rework the pseries CPU numbering so that CPUs that are removed, and later re-added, are given a CPU number on the same node as previously, when possible. - Add support for a new more flexible device-tree format for specifying NUMA distances. - Convert powerpc to GENERIC_PTDUMP. - Retire sbc8548 and sbc8641d board support. - Various other small features and fixes. Thanks to: Alexey Kardashevskiy, Aneesh Kumar K.V, Anton Blanchard, Cédric Le Goater, Christophe Leroy, Emmanuel Gil Peyrot, Fabiano Rosas, Fangrui Song, Finn Thain, Gautham R. Shenoy, Hari Bathini, Joel Stanley, Jordan Niethe, Kajol Jain, Laurent Dufour, Leonardo Bras, Lukas Bulwahn, Marc Zyngier, Masahiro Yamada, Michal Suchanek, Nathan Chancellor, Nicholas Piggin, Parth Shah, Paul Gortmaker, Pratik R. Sampat, Randy Dunlap, Sebastian Andrzej Siewior, Srikar Dronamraju, Wan Jiabing, Xiongwei Song, Zheng Yongjun. -----BEGIN PGP SIGNATURE----- iQJHBAABCAAxFiEEJFGtCPCthwEv2Y/bUevqPMjhpYAFAmEyHTYTHG1wZUBlbGxl cm1hbi5pZC5hdQAKCRBR6+o8yOGlgDo3D/9aXMVP2wsEMNB0XhTiJ1UUdi311Uq9 PvkAaGZH14ZqZLVigeiD3gt6YzTH0cEuGj6qgwsJrPDjF8FESnMbBsprMLr5/qE1 itWRGMAMCFaeTcB9ogYVJkzwg6RN2ZgIqoq4NVswNSXoAQGWb+1bvXq3RnXXNuGR TQmLL02poNC6nX0YbRaQoT1Xx4nfUTiKHhU+Aok9uOCMJIyYZVATR6Qafb7/j7tO UvjwOHztbu84lcJOGmSnw4LcmwNORLuP9IwR0r+O1M3ijEZqDo9TPkvtSz8HZwjU mxdJwhrUmN0euMcghuiFxW+1XG2eM49ugsdJugiezG2RaIijbIp0nAIvdeaKAgT1 OSSwvWCQ0fkTPyLXE+O6tVqMhlUMdqQlRcyNwmN9svIip9VnwGNq3vA4ePlJm6Fi i0i/tLqVNlJwFokZ7blW5g8SRgGRuFfXd5XUYLFvy5Teez+/7b1mW95gPQZSJ8kV Tbx2e0nHAPX4hCAxJ1AB3/zTlnjY+4+WJ9bD5XdgXkeVE8PPh1BEkulhMi1R1OMj 57D1W6OgsBu/Pze78wjAvwO8+NAb1T/2mv2Bd/LY6Q+7hNDqOOhuajyBTxbH41FG sqx5bKjKOwgTybfV9A0Eo0e4FQBX07yXltBFHaPlyA4sOsIhM59+PxNrEwN1eZrQ LVVsdBXg8pHxrw== =EbN0 -----END PGP SIGNATURE----- Merge tag 'powerpc-5.15-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc updates from Michael Ellerman: - Convert pseries & powernv to use MSI IRQ domains. - Rework the pseries CPU numbering so that CPUs that are removed, and later re-added, are given a CPU number on the same node as previously, when possible. - Add support for a new more flexible device-tree format for specifying NUMA distances. - Convert powerpc to GENERIC_PTDUMP. - Retire sbc8548 and sbc8641d board support. - Various other small features and fixes. Thanks to Alexey Kardashevskiy, Aneesh Kumar K.V, Anton Blanchard, Cédric Le Goater, Christophe Leroy, Emmanuel Gil Peyrot, Fabiano Rosas, Fangrui Song, Finn Thain, Gautham R. Shenoy, Hari Bathini, Joel Stanley, Jordan Niethe, Kajol Jain, Laurent Dufour, Leonardo Bras, Lukas Bulwahn, Marc Zyngier, Masahiro Yamada, Michal Suchanek, Nathan Chancellor, Nicholas Piggin, Parth Shah, Paul Gortmaker, Pratik R. Sampat, Randy Dunlap, Sebastian Andrzej Siewior, Srikar Dronamraju, Wan Jiabing, Xiongwei Song, and Zheng Yongjun. * tag 'powerpc-5.15-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (154 commits) powerpc/bug: Cast to unsigned long before passing to inline asm powerpc/ptdump: Fix generic ptdump for 64-bit KVM: PPC: Fix clearing never mapped TCEs in realmode powerpc/pseries/iommu: Rename "direct window" to "dma window" powerpc/pseries/iommu: Make use of DDW for indirect mapping powerpc/pseries/iommu: Find existing DDW with given property name powerpc/pseries/iommu: Update remove_dma_window() to accept property name powerpc/pseries/iommu: Reorganize iommu_table_setparms*() with new helper powerpc/pseries/iommu: Add ddw_property_create() and refactor enable_ddw() powerpc/pseries/iommu: Allow DDW windows starting at 0x00 powerpc/pseries/iommu: Add ddw_list_new_entry() helper powerpc/pseries/iommu: Add iommu_pseries_alloc_table() helper powerpc/kernel/iommu: Add new iommu_table_in_use() helper powerpc/pseries/iommu: Replace hard-coded page shift powerpc/numa: Update cpu_cpu_map on CPU online/offline powerpc/numa: Print debug statements only when required powerpc/numa: convert printk to pr_xxx powerpc/numa: Drop dbg in favour of pr_debug powerpc/smp: Enable CACHE domain for shared processor powerpc/smp: Update cpu_core_map on all PowerPc systems ...
1166 lines
31 KiB
C
1166 lines
31 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#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 <linux/hashtable.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_ORDER 8
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#define POWERNV_MAX_PSTATES (1UL << (POWERNV_MAX_PSTATES_ORDER))
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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 MAX_PSTATE_SHIFT 32
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#define LPSTATE_SHIFT 48
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#define GPSTATE_SHIFT 56
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#define MAX_NR_CHIPS 32
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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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* @policy: Associated CPUFreq policy
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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 DEFINE_HASHTABLE(pstate_revmap, POWERNV_MAX_PSTATES_ORDER);
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/**
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* struct pstate_idx_revmap_data: Entry in the hashmap pstate_revmap
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* indexed by a function of pstate id.
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*
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* @pstate_id: pstate id for this entry.
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*
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* @cpufreq_table_idx: Index into the powernv_freqs
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* cpufreq_frequency_table for frequency
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* corresponding to pstate_id.
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*
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* @hentry: hlist_node that hooks this entry into the pstate_revmap
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* hashtable
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*/
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struct pstate_idx_revmap_data {
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u8 pstate_id;
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unsigned int cpufreq_table_idx;
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struct hlist_node hentry;
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};
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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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static inline u8 extract_pstate(u64 pmsr_val, unsigned int shift)
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{
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return ((pmsr_val >> shift) & 0xFF);
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}
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#define extract_local_pstate(x) extract_pstate(x, LPSTATE_SHIFT)
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#define extract_global_pstate(x) extract_pstate(x, GPSTATE_SHIFT)
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#define extract_max_pstate(x) extract_pstate(x, MAX_PSTATE_SHIFT)
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/* Use following functions for conversions between pstate_id and index */
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/*
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* idx_to_pstate : Returns the pstate id corresponding to the
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* frequency in the cpufreq frequency table
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* powernv_freqs indexed by @i.
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*
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* If @i is out of bound, this will return the pstate
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* corresponding to the nominal frequency.
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*/
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static inline u8 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("idx_to_pstate: 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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/*
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* pstate_to_idx : Returns the index in the cpufreq frequencytable
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* powernv_freqs for the frequency whose corresponding
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* pstate id is @pstate.
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*
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* If no frequency corresponding to @pstate is found,
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* this will return the index of the nominal
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* frequency.
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*/
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static unsigned int pstate_to_idx(u8 pstate)
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{
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unsigned int key = pstate % POWERNV_MAX_PSTATES;
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struct pstate_idx_revmap_data *revmap_data;
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hash_for_each_possible(pstate_revmap, revmap_data, hentry, key) {
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if (revmap_data->pstate_id == pstate)
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return revmap_data->cpufreq_table_idx;
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}
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pr_warn_once("pstate_to_idx: pstate 0x%x not found\n", pstate);
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return powernv_pstate_info.nominal;
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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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int rc = -ENODEV;
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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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goto out;
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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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goto out;
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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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goto out;
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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 0x%x nominal 0x%x max 0x%x\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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goto out;
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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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goto out;
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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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goto out;
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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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struct pstate_idx_revmap_data *revmap_data;
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unsigned int key;
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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 & 0xFF;
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revmap_data = kmalloc(sizeof(*revmap_data), GFP_KERNEL);
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if (!revmap_data) {
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rc = -ENOMEM;
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goto out;
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}
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revmap_data->pstate_id = id & 0xFF;
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revmap_data->cpufreq_table_idx = i;
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key = (revmap_data->pstate_id) % POWERNV_MAX_PSTATES;
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hash_add(pstate_revmap, &revmap_data->hentry, key);
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if (id == pstate_max)
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powernv_pstate_info.max = i;
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if (id == pstate_nominal)
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powernv_pstate_info.nominal = i;
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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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of_node_put(power_mgt);
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return 0;
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out:
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of_node_put(power_mgt);
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return rc;
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}
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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(u8 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 0x%x outside of PState table, reporting nominal id 0x%x 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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static struct freq_attr cpufreq_freq_attr_cpuinfo_nominal_freq =
|
|
__ATTR_RO(cpuinfo_nominal_freq);
|
|
|
|
#define SCALING_BOOST_FREQS_ATTR_INDEX 2
|
|
|
|
static struct freq_attr *powernv_cpu_freq_attr[] = {
|
|
&cpufreq_freq_attr_scaling_available_freqs,
|
|
&cpufreq_freq_attr_cpuinfo_nominal_freq,
|
|
&cpufreq_freq_attr_scaling_boost_freqs,
|
|
NULL,
|
|
};
|
|
|
|
#define throttle_attr(name, member) \
|
|
static ssize_t name##_show(struct cpufreq_policy *policy, char *buf) \
|
|
{ \
|
|
struct chip *chip = per_cpu(chip_info, policy->cpu); \
|
|
\
|
|
return sprintf(buf, "%u\n", chip->member); \
|
|
} \
|
|
\
|
|
static struct freq_attr throttle_attr_##name = __ATTR_RO(name) \
|
|
|
|
throttle_attr(unthrottle, reason[NO_THROTTLE]);
|
|
throttle_attr(powercap, reason[POWERCAP]);
|
|
throttle_attr(overtemp, reason[CPU_OVERTEMP]);
|
|
throttle_attr(supply_fault, reason[POWER_SUPPLY_FAILURE]);
|
|
throttle_attr(overcurrent, reason[OVERCURRENT]);
|
|
throttle_attr(occ_reset, reason[OCC_RESET_THROTTLE]);
|
|
throttle_attr(turbo_stat, throttle_turbo);
|
|
throttle_attr(sub_turbo_stat, throttle_sub_turbo);
|
|
|
|
static struct attribute *throttle_attrs[] = {
|
|
&throttle_attr_unthrottle.attr,
|
|
&throttle_attr_powercap.attr,
|
|
&throttle_attr_overtemp.attr,
|
|
&throttle_attr_supply_fault.attr,
|
|
&throttle_attr_overcurrent.attr,
|
|
&throttle_attr_occ_reset.attr,
|
|
&throttle_attr_turbo_stat.attr,
|
|
&throttle_attr_sub_turbo_stat.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group throttle_attr_grp = {
|
|
.name = "throttle_stats",
|
|
.attrs = throttle_attrs,
|
|
};
|
|
|
|
/* Helper routines */
|
|
|
|
/* Access helpers to power mgt SPR */
|
|
|
|
static inline unsigned long get_pmspr(unsigned long sprn)
|
|
{
|
|
switch (sprn) {
|
|
case SPRN_PMCR:
|
|
return mfspr(SPRN_PMCR);
|
|
|
|
case SPRN_PMICR:
|
|
return mfspr(SPRN_PMICR);
|
|
|
|
case SPRN_PMSR:
|
|
return mfspr(SPRN_PMSR);
|
|
}
|
|
BUG();
|
|
}
|
|
|
|
static inline void set_pmspr(unsigned long sprn, unsigned long val)
|
|
{
|
|
switch (sprn) {
|
|
case SPRN_PMCR:
|
|
mtspr(SPRN_PMCR, val);
|
|
return;
|
|
|
|
case SPRN_PMICR:
|
|
mtspr(SPRN_PMICR, val);
|
|
return;
|
|
}
|
|
BUG();
|
|
}
|
|
|
|
/*
|
|
* Use objects of this type to query/update
|
|
* pstates on a remote CPU via smp_call_function.
|
|
*/
|
|
struct powernv_smp_call_data {
|
|
unsigned int freq;
|
|
u8 pstate_id;
|
|
u8 gpstate_id;
|
|
};
|
|
|
|
/*
|
|
* powernv_read_cpu_freq: Reads the current frequency on this CPU.
|
|
*
|
|
* Called via smp_call_function.
|
|
*
|
|
* 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;
|
|
struct powernv_smp_call_data *freq_data = arg;
|
|
|
|
pmspr_val = get_pmspr(SPRN_PMSR);
|
|
freq_data->pstate_id = extract_local_pstate(pmspr_val);
|
|
freq_data->freq = pstate_id_to_freq(freq_data->pstate_id);
|
|
|
|
pr_debug("cpu %d pmsr %016lX pstate_id 0x%x 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;
|
|
u8 pmsr_pmax;
|
|
unsigned int pmsr_pmax_idx;
|
|
|
|
pmsr = get_pmspr(SPRN_PMSR);
|
|
chip = this_cpu_read(chip_info);
|
|
|
|
/* Check for Pmax Capping */
|
|
pmsr_pmax = extract_max_pstate(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(0x%x) reduced below that of nominal frequency(0x%x)\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
|
|
*
|
|
* @t: Timer context used to fetch global pstate info struct
|
|
*
|
|
* 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
|
|
*/
|
|
static 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 the timer has migrated to the different cpu then bring
|
|
* it back to one of the policy->cpus
|
|
*/
|
|
if (!cpumask_test_cpu(raw_smp_processor_id(), policy->cpus)) {
|
|
gpstates->timer.expires = jiffies + msecs_to_jiffies(1);
|
|
add_timer_on(&gpstates->timer, cpumask_first(policy->cpus));
|
|
spin_unlock(&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 = extract_global_pstate(val);
|
|
freq_data.pstate_id = extract_local_pstate(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);
|
|
|
|
set_pstate(&freq_data);
|
|
spin_unlock(&gpstates->gpstate_lock);
|
|
}
|
|
|
|
/*
|
|
* 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());
|
|
|
|
freq_data.pstate_id = idx_to_pstate(new_index);
|
|
if (!gpstates) {
|
|
freq_data.gpstate_id = freq_data.pstate_id;
|
|
goto no_gpstate;
|
|
}
|
|
|
|
spin_lock(&gpstates->gpstate_lock);
|
|
|
|
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);
|
|
|
|
no_gpstate:
|
|
/*
|
|
* 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;
|
|
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);
|
|
}
|
|
|
|
policy->freq_table = powernv_freqs;
|
|
policy->fast_switch_possible = true;
|
|
|
|
if (pvr_version_is(PVR_POWER9))
|
|
return 0;
|
|
|
|
/* Initialise Gpstate ramp-down timer only on POWER8 */
|
|
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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int powernv_cpufreq_cpu_exit(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);
|
|
if (gpstates)
|
|
del_timer_sync(&gpstates->timer);
|
|
|
|
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) {
|
|
cpu_policy = cpufreq_cpu_get(cpu);
|
|
if (!cpu_policy)
|
|
continue;
|
|
powernv_cpufreq_target_index(cpu_policy, get_nominal_index());
|
|
cpufreq_cpu_put(cpu_policy);
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block powernv_cpufreq_reboot_nb = {
|
|
.notifier_call = powernv_cpufreq_reboot_notifier,
|
|
};
|
|
|
|
static void powernv_cpufreq_work_fn(struct work_struct *work)
|
|
{
|
|
struct chip *chip = container_of(work, struct chip, throttle);
|
|
struct cpufreq_policy *policy;
|
|
unsigned int cpu;
|
|
cpumask_t mask;
|
|
|
|
cpus_read_lock();
|
|
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;
|
|
|
|
policy = cpufreq_cpu_get(cpu);
|
|
if (!policy)
|
|
continue;
|
|
index = cpufreq_table_find_index_c(policy, policy->cur);
|
|
powernv_cpufreq_target_index(policy, index);
|
|
cpumask_andnot(&mask, &mask, policy->cpus);
|
|
cpufreq_cpu_put(policy);
|
|
}
|
|
out:
|
|
cpus_read_unlock();
|
|
}
|
|
|
|
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 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,
|
|
.attr = powernv_cpu_freq_attr,
|
|
};
|
|
|
|
static int init_chip_info(void)
|
|
{
|
|
unsigned int *chip;
|
|
unsigned int cpu, i;
|
|
unsigned int prev_chip_id = UINT_MAX;
|
|
cpumask_t *chip_cpu_mask;
|
|
int ret = 0;
|
|
|
|
chip = kcalloc(num_possible_cpus(), sizeof(*chip), GFP_KERNEL);
|
|
if (!chip)
|
|
return -ENOMEM;
|
|
|
|
/* Allocate a chip cpu mask large enough to fit mask for all chips */
|
|
chip_cpu_mask = kcalloc(MAX_NR_CHIPS, sizeof(cpumask_t), GFP_KERNEL);
|
|
if (!chip_cpu_mask) {
|
|
ret = -ENOMEM;
|
|
goto free_and_return;
|
|
}
|
|
|
|
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;
|
|
}
|
|
cpumask_set_cpu(cpu, &chip_cpu_mask[nr_chips-1]);
|
|
}
|
|
|
|
chips = kcalloc(nr_chips, sizeof(struct chip), GFP_KERNEL);
|
|
if (!chips) {
|
|
ret = -ENOMEM;
|
|
goto out_free_chip_cpu_mask;
|
|
}
|
|
|
|
for (i = 0; i < nr_chips; i++) {
|
|
chips[i].id = chip[i];
|
|
cpumask_copy(&chips[i].mask, &chip_cpu_mask[i]);
|
|
INIT_WORK(&chips[i].throttle, powernv_cpufreq_work_fn);
|
|
for_each_cpu(cpu, &chips[i].mask)
|
|
per_cpu(chip_info, cpu) = &chips[i];
|
|
}
|
|
|
|
out_free_chip_cpu_mask:
|
|
kfree(chip_cpu_mask);
|
|
free_and_return:
|
|
kfree(chip);
|
|
return ret;
|
|
}
|
|
|
|
static inline void clean_chip_info(void)
|
|
{
|
|
int i;
|
|
|
|
/* flush any pending work items */
|
|
if (chips)
|
|
for (i = 0; i < nr_chips; i++)
|
|
cancel_work_sync(&chips[i].throttle);
|
|
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;
|
|
|
|
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;
|
|
}
|
|
|
|
if (powernv_pstate_info.wof_enabled)
|
|
cpufreq_enable_boost_support();
|
|
|
|
register_reboot_notifier(&powernv_cpufreq_reboot_nb);
|
|
opal_message_notifier_register(OPAL_MSG_OCC, &powernv_cpufreq_opal_nb);
|
|
|
|
return 0;
|
|
cleanup:
|
|
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>");
|