mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
- Relocate the OPP (Operating Performance Points) framework to its own directory under drivers/ and add support for power domain performance states to it (Viresh Kumar). - Modify the PM core, the PCI bus type and the ACPI PM domain to support power management driver flags allowing device drivers to specify their capabilities and preferences regarding the handling of devices with enabled runtime PM during system suspend/resume and clean up that code somewhat (Rafael Wysocki, Ulf Hansson). - Add frequency-invariant accounting support to the task scheduler on ARM and ARM64 (Dietmar Eggemann). - Fix PM QoS device resume latency framework to prevent "no restriction" requests from overriding requests with specific requirements and drop the confusing PM_QOS_FLAG_REMOTE_WAKEUP device PM QoS flag (Rafael Wysocki). - Drop legacy class suspend/resume operations from the PM core and drop legacy bus type suspend and resume callbacks from ARM/locomo (Rafael Wysocki). - Add min/max frequency support to devfreq and clean it up somewhat (Chanwoo Choi). - Rework wakeup support in the generic power domains (genpd) framework and update some of its users accordingly (Geert Uytterhoeven). - Convert timers in the PM core to use timer_setup() (Kees Cook). - Add support for exposing the SLP_S0 (Low Power S0 Idle) residency counter based on the LPIT ACPI table on Intel platforms (Srinivas Pandruvada). - Add per-CPU PM QoS resume latency support to the ladder cpuidle governor (Ramesh Thomas). - Fix a deadlock between the wakeup notify handler and the notifier removal in the ACPI core (Ville Syrjälä). - Fix a cpufreq schedutil governor issue causing it to use stale cached frequency values sometimes (Viresh Kumar). - Fix an issue in the system suspend core support code causing wakeup events detection to fail in some cases (Rajat Jain). - Fix the generic power domains (genpd) framework to prevent the PM core from using the direct-complete optimization with it as that is guaranteed to fail (Ulf Hansson). - Fix a minor issue in the cpuidle core and clean it up a bit (Gaurav Jindal, Nicholas Piggin). - Fix and clean up the intel_idle and ARM cpuidle drivers (Jason Baron, Len Brown, Leo Yan). - Fix a couple of minor issues in the OPP framework and clean it up (Arvind Yadav, Fabio Estevam, Sudeep Holla, Tobias Jordan). - Fix and clean up some cpufreq drivers and fix a minor issue in the cpufreq statistics code (Arvind Yadav, Bhumika Goyal, Fabio Estevam, Gautham Shenoy, Gustavo Silva, Marek Szyprowski, Masahiro Yamada, Robert Jarzmik, Zumeng Chen). - Fix minor issues in the system suspend and hibernation core, in power management documentation and in the AVS (Adaptive Voltage Scaling) framework (Helge Deller, Himanshu Jha, Joe Perches, Rafael Wysocki). - Fix some issues in the cpupower utility and document that Shuah Khan is going to maintain it going forward (Prarit Bhargava, Shuah Khan). -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAABCAAGBQJaCg2eAAoJEILEb/54YlRxGhAP/26D5TvfQ65wtf2W0Gas/tsP +24SzCLQO2GWalhbOXZbXhnBn/eCovKB6T8VB0V7Bff0VcUOK9szmBu9hOBJfXGN ec2oYKtWPwqzkgPfbqjZhQTp5EXg/dmWYOhAMA7HLMv7oVZqoRZ/MNOJPooXAmQj NEVWj3Eap0anic0ZgGMN4FaIMF6CHP2rAheqWQVXihhXpjIOWrJCjEoPZfbH1bFC +zd9Batd3rq+eZ5dYxg+znpYcZi69kmPw+KASYsaWTJzNjYbR+VLOxqzx7Icdgbz 4glwWNe7lZGCAj+BIKGaHN5CR/fAXqkPvJ8csn6qISyUJ1Gph6otRfvuUaK58F4T 1Rmcj+mGXgJBcjaQGmVQIITKD6drBW/l50MJlze5JUM4A7VM2Di/cctgoWmOJsnO 2f6D6PYGuW0Fe8uUVGki/ddApXvoTGbEx+ncQ5+At+mLMKJwYfND9h2stOkCcrTy k4Pr+XpVU9hXwYVX3a1Au41bFQiXYwguxD1TH1LaY3liAWXvo0qNc/Ib6mW8e7pL wqPoe2/yxgVw5rsQPcKxVxAFFgjAAIdU3Xw44ETTPN315CLOoiuZgWkeTrnYCdix DaBWu1VN9tU5U6FWBlWXDb06i5qvSo3aYzLnSBC6fm7qX2SuDxGiQTcyOQ7H1NiQ d1wzhgObW98N7rZRaByu =QTnx -----END PGP SIGNATURE----- Merge tag 'pm-4.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull power management updates from Rafael Wysocki: "There are no real big ticket items here this time. The most noticeable change is probably the relocation of the OPP (Operating Performance Points) framework to its own directory under drivers/ as it has grown big enough for that. Also Viresh is now going to maintain it and send pull requests for it to me, so you will see this change in the git history going forward (but still not right now). Another noticeable set of changes is the modifications of the PM core, the PCI subsystem and the ACPI PM domain to allow of more integration between system-wide suspend/resume and runtime PM. For now it's just a way to avoid resuming devices from runtime suspend unnecessarily during system suspend (if the driver sets a flag to indicate its readiness for that) and in the works is an analogous mechanism to allow devices to stay suspended after system resume. In addition to that, we have some changes related to supporting frequency-invariant CPU utilization metrics in the scheduler and in the schedutil cpufreq governor on ARM and changes to add support for device performance states to the generic power domains (genpd) framework. The rest is mostly fixes and cleanups of various sorts. Specifics: - Relocate the OPP (Operating Performance Points) framework to its own directory under drivers/ and add support for power domain performance states to it (Viresh Kumar). - Modify the PM core, the PCI bus type and the ACPI PM domain to support power management driver flags allowing device drivers to specify their capabilities and preferences regarding the handling of devices with enabled runtime PM during system suspend/resume and clean up that code somewhat (Rafael Wysocki, Ulf Hansson). - Add frequency-invariant accounting support to the task scheduler on ARM and ARM64 (Dietmar Eggemann). - Fix PM QoS device resume latency framework to prevent "no restriction" requests from overriding requests with specific requirements and drop the confusing PM_QOS_FLAG_REMOTE_WAKEUP device PM QoS flag (Rafael Wysocki). - Drop legacy class suspend/resume operations from the PM core and drop legacy bus type suspend and resume callbacks from ARM/locomo (Rafael Wysocki). - Add min/max frequency support to devfreq and clean it up somewhat (Chanwoo Choi). - Rework wakeup support in the generic power domains (genpd) framework and update some of its users accordingly (Geert Uytterhoeven). - Convert timers in the PM core to use timer_setup() (Kees Cook). - Add support for exposing the SLP_S0 (Low Power S0 Idle) residency counter based on the LPIT ACPI table on Intel platforms (Srinivas Pandruvada). - Add per-CPU PM QoS resume latency support to the ladder cpuidle governor (Ramesh Thomas). - Fix a deadlock between the wakeup notify handler and the notifier removal in the ACPI core (Ville Syrjälä). - Fix a cpufreq schedutil governor issue causing it to use stale cached frequency values sometimes (Viresh Kumar). - Fix an issue in the system suspend core support code causing wakeup events detection to fail in some cases (Rajat Jain). - Fix the generic power domains (genpd) framework to prevent the PM core from using the direct-complete optimization with it as that is guaranteed to fail (Ulf Hansson). - Fix a minor issue in the cpuidle core and clean it up a bit (Gaurav Jindal, Nicholas Piggin). - Fix and clean up the intel_idle and ARM cpuidle drivers (Jason Baron, Len Brown, Leo Yan). - Fix a couple of minor issues in the OPP framework and clean it up (Arvind Yadav, Fabio Estevam, Sudeep Holla, Tobias Jordan). - Fix and clean up some cpufreq drivers and fix a minor issue in the cpufreq statistics code (Arvind Yadav, Bhumika Goyal, Fabio Estevam, Gautham Shenoy, Gustavo Silva, Marek Szyprowski, Masahiro Yamada, Robert Jarzmik, Zumeng Chen). - Fix minor issues in the system suspend and hibernation core, in power management documentation and in the AVS (Adaptive Voltage Scaling) framework (Helge Deller, Himanshu Jha, Joe Perches, Rafael Wysocki). - Fix some issues in the cpupower utility and document that Shuah Khan is going to maintain it going forward (Prarit Bhargava, Shuah Khan)" * tag 'pm-4.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (88 commits) tools/power/cpupower: add libcpupower.so.0.0.1 to .gitignore tools/power/cpupower: Add 64 bit library detection intel_idle: Graceful probe failure when MWAIT is disabled cpufreq: schedutil: Reset cached_raw_freq when not in sync with next_freq freezer: Fix typo in freezable_schedule_timeout() comment PM / s2idle: Clear the events_check_enabled flag cpufreq: stats: Handle the case when trans_table goes beyond PAGE_SIZE cpufreq: arm_big_little: make cpufreq_arm_bL_ops structures const cpufreq: arm_big_little: make function arguments and structure pointer const cpuidle: Avoid assignment in if () argument cpuidle: Clean up cpuidle_enable_device() error handling a bit ACPI / PM: Fix acpi_pm_notifier_lock vs flush_workqueue() deadlock PM / Domains: Fix genpd to deal with drivers returning 1 from ->prepare() cpuidle: ladder: Add per CPU PM QoS resume latency support PM / QoS: Fix device resume latency framework PM / domains: Rework governor code to be more consistent PM / Domains: Remove gpd_dev_ops.active_wakeup() callback soc: rockchip: power-domain: Use GENPD_FLAG_ACTIVE_WAKEUP soc: mediatek: Use GENPD_FLAG_ACTIVE_WAKEUP ARM: shmobile: pm-rmobile: Use GENPD_FLAG_ACTIVE_WAKEUP ...
520 lines
12 KiB
C
520 lines
12 KiB
C
/*
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* CPU subsystem support
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/cpu.h>
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#include <linux/topology.h>
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#include <linux/device.h>
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#include <linux/node.h>
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#include <linux/gfp.h>
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#include <linux/slab.h>
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#include <linux/percpu.h>
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#include <linux/acpi.h>
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#include <linux/of.h>
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#include <linux/cpufeature.h>
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#include <linux/tick.h>
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#include <linux/pm_qos.h>
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#include <linux/sched/isolation.h>
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#include "base.h"
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static DEFINE_PER_CPU(struct device *, cpu_sys_devices);
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static int cpu_subsys_match(struct device *dev, struct device_driver *drv)
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{
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/* ACPI style match is the only one that may succeed. */
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if (acpi_driver_match_device(dev, drv))
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return 1;
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return 0;
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}
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#ifdef CONFIG_HOTPLUG_CPU
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static void change_cpu_under_node(struct cpu *cpu,
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unsigned int from_nid, unsigned int to_nid)
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{
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int cpuid = cpu->dev.id;
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unregister_cpu_under_node(cpuid, from_nid);
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register_cpu_under_node(cpuid, to_nid);
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cpu->node_id = to_nid;
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}
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static int cpu_subsys_online(struct device *dev)
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{
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struct cpu *cpu = container_of(dev, struct cpu, dev);
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int cpuid = dev->id;
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int from_nid, to_nid;
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int ret;
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from_nid = cpu_to_node(cpuid);
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if (from_nid == NUMA_NO_NODE)
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return -ENODEV;
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ret = cpu_up(cpuid);
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/*
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* When hot adding memory to memoryless node and enabling a cpu
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* on the node, node number of the cpu may internally change.
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*/
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to_nid = cpu_to_node(cpuid);
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if (from_nid != to_nid)
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change_cpu_under_node(cpu, from_nid, to_nid);
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return ret;
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}
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static int cpu_subsys_offline(struct device *dev)
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{
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return cpu_down(dev->id);
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}
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void unregister_cpu(struct cpu *cpu)
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{
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int logical_cpu = cpu->dev.id;
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unregister_cpu_under_node(logical_cpu, cpu_to_node(logical_cpu));
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device_unregister(&cpu->dev);
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per_cpu(cpu_sys_devices, logical_cpu) = NULL;
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return;
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}
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#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
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static ssize_t cpu_probe_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t count)
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{
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ssize_t cnt;
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int ret;
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ret = lock_device_hotplug_sysfs();
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if (ret)
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return ret;
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cnt = arch_cpu_probe(buf, count);
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unlock_device_hotplug();
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return cnt;
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}
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static ssize_t cpu_release_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t count)
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{
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ssize_t cnt;
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int ret;
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ret = lock_device_hotplug_sysfs();
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if (ret)
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return ret;
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cnt = arch_cpu_release(buf, count);
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unlock_device_hotplug();
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return cnt;
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}
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static DEVICE_ATTR(probe, S_IWUSR, NULL, cpu_probe_store);
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static DEVICE_ATTR(release, S_IWUSR, NULL, cpu_release_store);
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#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
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#endif /* CONFIG_HOTPLUG_CPU */
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struct bus_type cpu_subsys = {
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.name = "cpu",
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.dev_name = "cpu",
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.match = cpu_subsys_match,
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#ifdef CONFIG_HOTPLUG_CPU
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.online = cpu_subsys_online,
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.offline = cpu_subsys_offline,
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#endif
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};
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EXPORT_SYMBOL_GPL(cpu_subsys);
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#ifdef CONFIG_KEXEC
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#include <linux/kexec.h>
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static ssize_t show_crash_notes(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct cpu *cpu = container_of(dev, struct cpu, dev);
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ssize_t rc;
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unsigned long long addr;
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int cpunum;
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cpunum = cpu->dev.id;
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/*
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* Might be reading other cpu's data based on which cpu read thread
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* has been scheduled. But cpu data (memory) is allocated once during
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* boot up and this data does not change there after. Hence this
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* operation should be safe. No locking required.
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*/
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addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpunum));
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rc = sprintf(buf, "%Lx\n", addr);
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return rc;
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}
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static DEVICE_ATTR(crash_notes, 0400, show_crash_notes, NULL);
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static ssize_t show_crash_notes_size(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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ssize_t rc;
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rc = sprintf(buf, "%zu\n", sizeof(note_buf_t));
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return rc;
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}
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static DEVICE_ATTR(crash_notes_size, 0400, show_crash_notes_size, NULL);
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static struct attribute *crash_note_cpu_attrs[] = {
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&dev_attr_crash_notes.attr,
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&dev_attr_crash_notes_size.attr,
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NULL
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};
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static struct attribute_group crash_note_cpu_attr_group = {
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.attrs = crash_note_cpu_attrs,
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};
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#endif
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static const struct attribute_group *common_cpu_attr_groups[] = {
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#ifdef CONFIG_KEXEC
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&crash_note_cpu_attr_group,
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#endif
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NULL
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};
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static const struct attribute_group *hotplugable_cpu_attr_groups[] = {
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#ifdef CONFIG_KEXEC
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&crash_note_cpu_attr_group,
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#endif
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NULL
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};
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/*
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* Print cpu online, possible, present, and system maps
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*/
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struct cpu_attr {
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struct device_attribute attr;
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const struct cpumask *const map;
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};
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static ssize_t show_cpus_attr(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct cpu_attr *ca = container_of(attr, struct cpu_attr, attr);
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return cpumap_print_to_pagebuf(true, buf, ca->map);
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}
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#define _CPU_ATTR(name, map) \
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{ __ATTR(name, 0444, show_cpus_attr, NULL), map }
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/* Keep in sync with cpu_subsys_attrs */
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static struct cpu_attr cpu_attrs[] = {
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_CPU_ATTR(online, &__cpu_online_mask),
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_CPU_ATTR(possible, &__cpu_possible_mask),
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_CPU_ATTR(present, &__cpu_present_mask),
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};
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/*
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* Print values for NR_CPUS and offlined cpus
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*/
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static ssize_t print_cpus_kernel_max(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int n = snprintf(buf, PAGE_SIZE-2, "%d\n", NR_CPUS - 1);
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return n;
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}
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static DEVICE_ATTR(kernel_max, 0444, print_cpus_kernel_max, NULL);
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/* arch-optional setting to enable display of offline cpus >= nr_cpu_ids */
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unsigned int total_cpus;
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static ssize_t print_cpus_offline(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int n = 0, len = PAGE_SIZE-2;
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cpumask_var_t offline;
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/* display offline cpus < nr_cpu_ids */
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if (!alloc_cpumask_var(&offline, GFP_KERNEL))
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return -ENOMEM;
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cpumask_andnot(offline, cpu_possible_mask, cpu_online_mask);
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n = scnprintf(buf, len, "%*pbl", cpumask_pr_args(offline));
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free_cpumask_var(offline);
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/* display offline cpus >= nr_cpu_ids */
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if (total_cpus && nr_cpu_ids < total_cpus) {
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if (n && n < len)
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buf[n++] = ',';
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if (nr_cpu_ids == total_cpus-1)
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n += snprintf(&buf[n], len - n, "%u", nr_cpu_ids);
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else
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n += snprintf(&buf[n], len - n, "%u-%d",
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nr_cpu_ids, total_cpus-1);
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}
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n += snprintf(&buf[n], len - n, "\n");
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return n;
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}
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static DEVICE_ATTR(offline, 0444, print_cpus_offline, NULL);
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static ssize_t print_cpus_isolated(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int n = 0, len = PAGE_SIZE-2;
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cpumask_var_t isolated;
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if (!alloc_cpumask_var(&isolated, GFP_KERNEL))
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return -ENOMEM;
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cpumask_andnot(isolated, cpu_possible_mask,
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housekeeping_cpumask(HK_FLAG_DOMAIN));
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n = scnprintf(buf, len, "%*pbl\n", cpumask_pr_args(isolated));
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free_cpumask_var(isolated);
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return n;
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}
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static DEVICE_ATTR(isolated, 0444, print_cpus_isolated, NULL);
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#ifdef CONFIG_NO_HZ_FULL
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static ssize_t print_cpus_nohz_full(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int n = 0, len = PAGE_SIZE-2;
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n = scnprintf(buf, len, "%*pbl\n", cpumask_pr_args(tick_nohz_full_mask));
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return n;
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}
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static DEVICE_ATTR(nohz_full, 0444, print_cpus_nohz_full, NULL);
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#endif
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static void cpu_device_release(struct device *dev)
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{
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/*
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* This is an empty function to prevent the driver core from spitting a
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* warning at us. Yes, I know this is directly opposite of what the
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* documentation for the driver core and kobjects say, and the author
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* of this code has already been publically ridiculed for doing
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* something as foolish as this. However, at this point in time, it is
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* the only way to handle the issue of statically allocated cpu
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* devices. The different architectures will have their cpu device
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* code reworked to properly handle this in the near future, so this
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* function will then be changed to correctly free up the memory held
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* by the cpu device.
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*
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* Never copy this way of doing things, or you too will be made fun of
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* on the linux-kernel list, you have been warned.
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*/
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}
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#ifdef CONFIG_GENERIC_CPU_AUTOPROBE
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static ssize_t print_cpu_modalias(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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ssize_t n;
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u32 i;
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n = sprintf(buf, "cpu:type:" CPU_FEATURE_TYPEFMT ":feature:",
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CPU_FEATURE_TYPEVAL);
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for (i = 0; i < MAX_CPU_FEATURES; i++)
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if (cpu_have_feature(i)) {
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if (PAGE_SIZE < n + sizeof(",XXXX\n")) {
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WARN(1, "CPU features overflow page\n");
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break;
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}
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n += sprintf(&buf[n], ",%04X", i);
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}
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buf[n++] = '\n';
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return n;
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}
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static int cpu_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
char *buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
|
|
if (buf) {
|
|
print_cpu_modalias(NULL, NULL, buf);
|
|
add_uevent_var(env, "MODALIAS=%s", buf);
|
|
kfree(buf);
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* register_cpu - Setup a sysfs device for a CPU.
|
|
* @cpu - cpu->hotpluggable field set to 1 will generate a control file in
|
|
* sysfs for this CPU.
|
|
* @num - CPU number to use when creating the device.
|
|
*
|
|
* Initialize and register the CPU device.
|
|
*/
|
|
int register_cpu(struct cpu *cpu, int num)
|
|
{
|
|
int error;
|
|
|
|
cpu->node_id = cpu_to_node(num);
|
|
memset(&cpu->dev, 0x00, sizeof(struct device));
|
|
cpu->dev.id = num;
|
|
cpu->dev.bus = &cpu_subsys;
|
|
cpu->dev.release = cpu_device_release;
|
|
cpu->dev.offline_disabled = !cpu->hotpluggable;
|
|
cpu->dev.offline = !cpu_online(num);
|
|
cpu->dev.of_node = of_get_cpu_node(num, NULL);
|
|
#ifdef CONFIG_GENERIC_CPU_AUTOPROBE
|
|
cpu->dev.bus->uevent = cpu_uevent;
|
|
#endif
|
|
cpu->dev.groups = common_cpu_attr_groups;
|
|
if (cpu->hotpluggable)
|
|
cpu->dev.groups = hotplugable_cpu_attr_groups;
|
|
error = device_register(&cpu->dev);
|
|
if (error)
|
|
return error;
|
|
|
|
per_cpu(cpu_sys_devices, num) = &cpu->dev;
|
|
register_cpu_under_node(num, cpu_to_node(num));
|
|
dev_pm_qos_expose_latency_limit(&cpu->dev,
|
|
PM_QOS_RESUME_LATENCY_NO_CONSTRAINT);
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct device *get_cpu_device(unsigned cpu)
|
|
{
|
|
if (cpu < nr_cpu_ids && cpu_possible(cpu))
|
|
return per_cpu(cpu_sys_devices, cpu);
|
|
else
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(get_cpu_device);
|
|
|
|
static void device_create_release(struct device *dev)
|
|
{
|
|
kfree(dev);
|
|
}
|
|
|
|
static struct device *
|
|
__cpu_device_create(struct device *parent, void *drvdata,
|
|
const struct attribute_group **groups,
|
|
const char *fmt, va_list args)
|
|
{
|
|
struct device *dev = NULL;
|
|
int retval = -ENODEV;
|
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
if (!dev) {
|
|
retval = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
device_initialize(dev);
|
|
dev->parent = parent;
|
|
dev->groups = groups;
|
|
dev->release = device_create_release;
|
|
dev_set_drvdata(dev, drvdata);
|
|
|
|
retval = kobject_set_name_vargs(&dev->kobj, fmt, args);
|
|
if (retval)
|
|
goto error;
|
|
|
|
retval = device_add(dev);
|
|
if (retval)
|
|
goto error;
|
|
|
|
return dev;
|
|
|
|
error:
|
|
put_device(dev);
|
|
return ERR_PTR(retval);
|
|
}
|
|
|
|
struct device *cpu_device_create(struct device *parent, void *drvdata,
|
|
const struct attribute_group **groups,
|
|
const char *fmt, ...)
|
|
{
|
|
va_list vargs;
|
|
struct device *dev;
|
|
|
|
va_start(vargs, fmt);
|
|
dev = __cpu_device_create(parent, drvdata, groups, fmt, vargs);
|
|
va_end(vargs);
|
|
return dev;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cpu_device_create);
|
|
|
|
#ifdef CONFIG_GENERIC_CPU_AUTOPROBE
|
|
static DEVICE_ATTR(modalias, 0444, print_cpu_modalias, NULL);
|
|
#endif
|
|
|
|
static struct attribute *cpu_root_attrs[] = {
|
|
#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
|
|
&dev_attr_probe.attr,
|
|
&dev_attr_release.attr,
|
|
#endif
|
|
&cpu_attrs[0].attr.attr,
|
|
&cpu_attrs[1].attr.attr,
|
|
&cpu_attrs[2].attr.attr,
|
|
&dev_attr_kernel_max.attr,
|
|
&dev_attr_offline.attr,
|
|
&dev_attr_isolated.attr,
|
|
#ifdef CONFIG_NO_HZ_FULL
|
|
&dev_attr_nohz_full.attr,
|
|
#endif
|
|
#ifdef CONFIG_GENERIC_CPU_AUTOPROBE
|
|
&dev_attr_modalias.attr,
|
|
#endif
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group cpu_root_attr_group = {
|
|
.attrs = cpu_root_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *cpu_root_attr_groups[] = {
|
|
&cpu_root_attr_group,
|
|
NULL,
|
|
};
|
|
|
|
bool cpu_is_hotpluggable(unsigned cpu)
|
|
{
|
|
struct device *dev = get_cpu_device(cpu);
|
|
return dev && container_of(dev, struct cpu, dev)->hotpluggable;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cpu_is_hotpluggable);
|
|
|
|
#ifdef CONFIG_GENERIC_CPU_DEVICES
|
|
static DEFINE_PER_CPU(struct cpu, cpu_devices);
|
|
#endif
|
|
|
|
static void __init cpu_dev_register_generic(void)
|
|
{
|
|
#ifdef CONFIG_GENERIC_CPU_DEVICES
|
|
int i;
|
|
|
|
for_each_possible_cpu(i) {
|
|
if (register_cpu(&per_cpu(cpu_devices, i), i))
|
|
panic("Failed to register CPU device");
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void __init cpu_dev_init(void)
|
|
{
|
|
if (subsys_system_register(&cpu_subsys, cpu_root_attr_groups))
|
|
panic("Failed to register CPU subsystem");
|
|
|
|
cpu_dev_register_generic();
|
|
}
|