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)
1) ACPI-based PCI hotplug (ACPIPHP) subsystem rework and introduction of Intel Thunderbolt support on systems that use ACPI for signalling Thunderbolt hotplug events. This also should make ACPIPHP work in some cases in which it was known to have problems. From Rafael J Wysocki, Mika Westerberg and Kirill A Shutemov. 2) ACPI core code cleanups and dock station support cleanups from Jiang Liu and Rafael J Wysocki. 3) Fixes for locking problems related to ACPI device hotplug from Rafael J Wysocki. 4) ACPICA update to version 20130725 includig fixes, cleanups, support for more than 256 GPEs per GPE block and a change to make the ACPI PM Timer optional (we've seen systems without the PM Timer in the field already). One of the fixes, related to the DeRefOf operator, is necessary to prevent some Windows 8 oriented AML from causing problems to happen. From Bob Moore, Lv Zheng, and Jung-uk Kim. 5) Removal of the old and long deprecated /proc/acpi/event interface and related driver changes from Thomas Renninger. 6) ACPI and Xen changes to make the reduced hardware sleep work with the latter from Ben Guthro. 7) ACPI video driver cleanups and a blacklist of systems that should not tell the BIOS that they are compatible with Windows 8 (or ACPI backlight and possibly other things will not work on them). From Felipe Contreras. 8) Assorted ACPI fixes and cleanups from Aaron Lu, Hanjun Guo, Kuppuswamy Sathyanarayanan, Lan Tianyu, Sachin Kamat, Tang Chen, Toshi Kani, and Wei Yongjun. 9) cpufreq ondemand governor target frequency selection change to reduce oscillations between min and max frequencies (essentially, it causes the governor to choose target frequencies proportional to load) from Stratos Karafotis. 10) cpufreq fixes allowing sysfs attributes file permissions to be preserved over suspend/resume cycles Srivatsa S Bhat. 11) Removal of Device Tree parsing for CPU device nodes from multiple cpufreq drivers that required some changes related to of_get_cpu_node() to be made in a few architectures and in the driver core. From Sudeep KarkadaNagesha. 12) cpufreq core fixes and cleanups related to mutual exclusion and driver module references from Viresh Kumar, Lukasz Majewski and Rafael J Wysocki. 13) Assorted cpufreq fixes and cleanups from Amit Daniel Kachhap, Bartlomiej Zolnierkiewicz, Hanjun Guo, Jingoo Han, Joseph Lo, Julia Lawall, Li Zhong, Mark Brown, Sascha Hauer, Stephen Boyd, Stratos Karafotis, and Viresh Kumar. 14) Fixes to prevent race conditions in coupled cpuidle from happening from Colin Cross. 15) cpuidle core fixes and cleanups from Daniel Lezcano and Tuukka Tikkanen. 16) Assorted cpuidle fixes and cleanups from Daniel Lezcano, Geert Uytterhoeven, Jingoo Han, Julia Lawall, Linus Walleij, and Sahara. 17) System sleep tracing changes from Todd E Brandt and Shuah Khan. 18) PNP subsystem conversion to using struct dev_pm_ops for power management from Shuah Khan. / -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (GNU/Linux) iQIcBAABCAAGBQJSJcKhAAoJEKhOf7ml8uNsplIQAJSOshxhkkemvFOuHZ+0YIbh R9aufjXeDkMDBi8YtU+tB7ERth1j+0LUSM0NTnP51U7e+7eSGobA9s5jSZQj2l7r HFtnSOegLuKAfqwgfSLK91xa1rTFdfW0Kych9G2nuHtBIt6P0Oc59Cb5M0oy6QXs nVtaDEuU//tmO71+EF5HnMJHabRTrpvtn/7NbDUpU7LZYpWJrHJFT9xt1rXNab7H YRCATPm3kXGRg58Doc3EZE4G3D7DLvq74jWMaI089X/m5Pg1G6upqArypOy6oxdP p2FEzYVrb2bi8fakXp7BBeO1gCJTAqIgAkbSSZHLpGhFaeEMmb9/DWPXdm2TjzMV c1EEucvsqZWoprXgy12i5Hk814xN8d8nBBLg/UYiRJ44nc/hevXfyE9ZYj6bkseJ +GNHmZIa1QYC05nnGli4+W4kHns8EZf/gmvIxnPuco1RN2yMWagrud5/G6Dr9M2B hzJV6qauLVzgZso4oe79zv9aVxe/dPHKANLD/sg23WBiJJbJF1ocBlnj2Xlbpqze pmMUWGiO/gUiS0fmpW/lAJauza5jFmSCjE4E8R0Gyn0j4YXjmMhdEanaU6J3VuCi yVgEzYEth4sowq4AflMMLKYN+WmozDnK7taZRGmT0t+EKRFKLT6EgnNrkQgs1vKl oawD9LM4fZ8E0yroOEme =CgqW -----END PGP SIGNATURE----- Merge tag 'pm+acpi-3.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull ACPI and power management updates from Rafael Wysocki: 1) ACPI-based PCI hotplug (ACPIPHP) subsystem rework and introduction of Intel Thunderbolt support on systems that use ACPI for signalling Thunderbolt hotplug events. This also should make ACPIPHP work in some cases in which it was known to have problems. From Rafael J Wysocki, Mika Westerberg and Kirill A Shutemov. 2) ACPI core code cleanups and dock station support cleanups from Jiang Liu and Rafael J Wysocki. 3) Fixes for locking problems related to ACPI device hotplug from Rafael J Wysocki. 4) ACPICA update to version 20130725 includig fixes, cleanups, support for more than 256 GPEs per GPE block and a change to make the ACPI PM Timer optional (we've seen systems without the PM Timer in the field already). One of the fixes, related to the DeRefOf operator, is necessary to prevent some Windows 8 oriented AML from causing problems to happen. From Bob Moore, Lv Zheng, and Jung-uk Kim. 5) Removal of the old and long deprecated /proc/acpi/event interface and related driver changes from Thomas Renninger. 6) ACPI and Xen changes to make the reduced hardware sleep work with the latter from Ben Guthro. 7) ACPI video driver cleanups and a blacklist of systems that should not tell the BIOS that they are compatible with Windows 8 (or ACPI backlight and possibly other things will not work on them). From Felipe Contreras. 8) Assorted ACPI fixes and cleanups from Aaron Lu, Hanjun Guo, Kuppuswamy Sathyanarayanan, Lan Tianyu, Sachin Kamat, Tang Chen, Toshi Kani, and Wei Yongjun. 9) cpufreq ondemand governor target frequency selection change to reduce oscillations between min and max frequencies (essentially, it causes the governor to choose target frequencies proportional to load) from Stratos Karafotis. 10) cpufreq fixes allowing sysfs attributes file permissions to be preserved over suspend/resume cycles Srivatsa S Bhat. 11) Removal of Device Tree parsing for CPU device nodes from multiple cpufreq drivers that required some changes related to of_get_cpu_node() to be made in a few architectures and in the driver core. From Sudeep KarkadaNagesha. 12) cpufreq core fixes and cleanups related to mutual exclusion and driver module references from Viresh Kumar, Lukasz Majewski and Rafael J Wysocki. 13) Assorted cpufreq fixes and cleanups from Amit Daniel Kachhap, Bartlomiej Zolnierkiewicz, Hanjun Guo, Jingoo Han, Joseph Lo, Julia Lawall, Li Zhong, Mark Brown, Sascha Hauer, Stephen Boyd, Stratos Karafotis, and Viresh Kumar. 14) Fixes to prevent race conditions in coupled cpuidle from happening from Colin Cross. 15) cpuidle core fixes and cleanups from Daniel Lezcano and Tuukka Tikkanen. 16) Assorted cpuidle fixes and cleanups from Daniel Lezcano, Geert Uytterhoeven, Jingoo Han, Julia Lawall, Linus Walleij, and Sahara. 17) System sleep tracing changes from Todd E Brandt and Shuah Khan. 18) PNP subsystem conversion to using struct dev_pm_ops for power management from Shuah Khan. * tag 'pm+acpi-3.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (217 commits) cpufreq: Don't use smp_processor_id() in preemptible context cpuidle: coupled: fix race condition between pokes and safe state cpuidle: coupled: abort idle if pokes are pending cpuidle: coupled: disable interrupts after entering safe state ACPI / hotplug: Remove containers synchronously driver core / ACPI: Avoid device hot remove locking issues cpufreq: governor: Fix typos in comments cpufreq: governors: Remove duplicate check of target freq in supported range cpufreq: Fix timer/workqueue corruption due to double queueing ACPI / EC: Add ASUSTEK L4R to quirk list in order to validate ECDT ACPI / thermal: Add check of "_TZD" availability and evaluating result cpufreq: imx6q: Fix clock enable balance ACPI: blacklist win8 OSI for buggy laptops cpufreq: tegra: fix the wrong clock name cpuidle: Change struct menu_device field types cpuidle: Add a comment warning about possible overflow cpuidle: Fix variable domains in get_typical_interval() cpuidle: Fix menu_device->intervals type cpuidle: CodingStyle: Break up multiple assignments on single line cpuidle: Check called function parameter in get_typical_interval() ...
380 lines
9.3 KiB
C
380 lines
9.3 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 "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 __ref 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 = -ENODEV;
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cpu_hotplug_driver_lock();
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from_nid = cpu_to_node(cpuid);
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if (from_nid == NUMA_NO_NODE)
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goto out;
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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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out:
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cpu_hotplug_driver_unlock();
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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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int ret;
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cpu_hotplug_driver_lock();
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ret = cpu_down(dev->id);
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cpu_hotplug_driver_unlock();
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return ret;
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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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return arch_cpu_probe(buf, count);
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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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return arch_cpu_release(buf, count);
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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 * 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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int n = cpulist_scnprintf(buf, PAGE_SIZE-2, *(ca->map));
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buf[n++] = '\n';
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buf[n] = '\0';
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return n;
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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 = cpulist_scnprintf(buf, len, 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, "%d", nr_cpu_ids);
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else
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n += snprintf(&buf[n], len - n, "%d-%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 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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/*
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* register_cpu - Setup a sysfs device for a CPU.
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* @cpu - cpu->hotpluggable field set to 1 will generate a control file in
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* sysfs for this CPU.
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* @num - CPU number to use when creating the device.
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*
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* Initialize and register the CPU device.
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*/
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int register_cpu(struct cpu *cpu, int num)
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{
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int error;
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cpu->node_id = cpu_to_node(num);
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memset(&cpu->dev, 0x00, sizeof(struct device));
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cpu->dev.id = num;
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cpu->dev.bus = &cpu_subsys;
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cpu->dev.release = cpu_device_release;
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cpu->dev.offline_disabled = !cpu->hotpluggable;
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cpu->dev.offline = !cpu_online(num);
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cpu->dev.of_node = of_get_cpu_node(num, NULL);
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#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
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cpu->dev.bus->uevent = arch_cpu_uevent;
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#endif
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cpu->dev.groups = common_cpu_attr_groups;
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if (cpu->hotpluggable)
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cpu->dev.groups = hotplugable_cpu_attr_groups;
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error = device_register(&cpu->dev);
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if (!error)
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per_cpu(cpu_sys_devices, num) = &cpu->dev;
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if (!error)
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register_cpu_under_node(num, cpu_to_node(num));
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return error;
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}
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struct device *get_cpu_device(unsigned cpu)
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{
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if (cpu < nr_cpu_ids && cpu_possible(cpu))
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return per_cpu(cpu_sys_devices, cpu);
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else
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return NULL;
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}
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EXPORT_SYMBOL_GPL(get_cpu_device);
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#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
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static DEVICE_ATTR(modalias, 0444, arch_print_cpu_modalias, NULL);
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#endif
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static struct attribute *cpu_root_attrs[] = {
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#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
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&dev_attr_probe.attr,
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&dev_attr_release.attr,
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#endif
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&cpu_attrs[0].attr.attr,
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&cpu_attrs[1].attr.attr,
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&cpu_attrs[2].attr.attr,
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&dev_attr_kernel_max.attr,
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&dev_attr_offline.attr,
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#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
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&dev_attr_modalias.attr,
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#endif
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NULL
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};
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static struct attribute_group cpu_root_attr_group = {
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.attrs = cpu_root_attrs,
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};
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static const struct attribute_group *cpu_root_attr_groups[] = {
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&cpu_root_attr_group,
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NULL,
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};
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bool cpu_is_hotpluggable(unsigned cpu)
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{
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struct device *dev = get_cpu_device(cpu);
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return dev && container_of(dev, struct cpu, dev)->hotpluggable;
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}
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EXPORT_SYMBOL_GPL(cpu_is_hotpluggable);
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#ifdef CONFIG_GENERIC_CPU_DEVICES
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static DEFINE_PER_CPU(struct cpu, cpu_devices);
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#endif
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static void __init cpu_dev_register_generic(void)
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{
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#ifdef CONFIG_GENERIC_CPU_DEVICES
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int i;
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for_each_possible_cpu(i) {
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if (register_cpu(&per_cpu(cpu_devices, i), i))
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panic("Failed to register CPU device");
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}
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#endif
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}
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void __init cpu_dev_init(void)
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|
{
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if (subsys_system_register(&cpu_subsys, cpu_root_attr_groups))
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|
panic("Failed to register CPU subsystem");
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|
|
|
cpu_dev_register_generic();
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}
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