Home
last modified time | relevance | path

Searched +full:timer +full:- +full:cannot +full:- +full:wake +full:- +full:cpu (Results 1 – 25 of 152) sorted by relevance

1234567

/linux-6.8/Documentation/devicetree/bindings/timer/
Driscv,timer.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/timer/riscv,timer.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: RISC-V timer
10 - Anup Patel <anup@brainfault.org>
13 RISC-V platforms always have a RISC-V timer device for the supervisor-mode
14 based on the time CSR defined by the RISC-V privileged specification. The
15 timer interrupts of this device are configured using the RISC-V SBI Time
16 extension or the RISC-V Sstc extension.
[all …]
/linux-6.8/kernel/time/
Dtimer.c1 // SPDX-License-Identifier: GPL-2.0
7 * 1997-01-28 Modified by Finn Arne Gangstad to make timers scale better.
9 * 1997-09-10 Updated NTP code according to technical memorandum Jan '96
11 * 1998-12-24 Fixed a xtime SMP race (we need the xtime_lock rw spinlock to
14 * 1999-03-10 Improved NTP compatibility by Ulrich Windl
15 * 2002-05-31 Move sys_sysinfo here and make its locking sane, Robert Love
16 * 2000-10-05 Implemented scalable SMP per-CPU timer handling.
33 #include <linux/posix-timers.h>
34 #include <linux/cpu.h>
55 #include "tick-internal.h"
[all …]
Dtick-broadcast.c1 // SPDX-License-Identifier: GPL-2.0
3 * This file contains functions which emulate a local clock-event
6 * Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
7 * Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar
8 * Copyright(C) 2006-2007, Timesys Corp., Thomas Gleixner
10 #include <linux/cpu.h>
20 #include "tick-internal.h"
24 * timer stops in C3 state.
39 static void tick_broadcast_clear_oneshot(int cpu);
42 static void tick_broadcast_oneshot_offline(unsigned int cpu);
[all …]
/linux-6.8/drivers/firmware/psci/
Dpsci_checker.c1 // SPDX-License-Identifier: GPL-2.0-only
11 #include <linux/cpu.h>
31 static int tos_resident_cpu = -1;
42 * "enable-method" property of each CPU in the DT, but given that there is no
43 * arch-specific way to check this, we assume that the DT is sensible.
47 int migrate_type = -1; in psci_ops_check()
48 int cpu; in psci_ops_check() local
52 return -EOPNOTSUPP; in psci_ops_check()
61 for_each_online_cpu(cpu) in psci_ops_check()
62 if (psci_tos_resident_on(cpu)) { in psci_ops_check()
[all …]
/linux-6.8/drivers/clocksource/
Dtimer-riscv.c1 // SPDX-License-Identifier: GPL-2.0
6 * All RISC-V systems have a timer attached to every hart. These timers can
11 #define pr_fmt(fmt) "riscv-timer: " fmt
16 #include <linux/cpu.h>
22 #include <linux/io-64-nonatomic-lo-hi.h>
26 #include <clocksource/timer-riscv.h>
107 static int riscv_timer_starting_cpu(unsigned int cpu) in riscv_timer_starting_cpu() argument
109 struct clock_event_device *ce = per_cpu_ptr(&riscv_clock_event, cpu); in riscv_timer_starting_cpu()
111 ce->cpumask = cpumask_of(cpu); in riscv_timer_starting_cpu()
112 ce->irq = riscv_clock_event_irq; in riscv_timer_starting_cpu()
[all …]
/linux-6.8/Documentation/devicetree/bindings/cpu/
Didle-states.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/cpu/idle-states.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
11 - Anup Patel <anup@brainfault.org>
15 1 - Introduction
18 ARM and RISC-V systems contain HW capable of managing power consumption
19 dynamically, where cores can be put in different low-power states (ranging
20 from simple wfi to power gating) according to OS PM policies. The CPU states
[all …]
/linux-6.8/kernel/futex/
Dwaitwake.c1 // SPDX-License-Identifier: GPL-2.0-or-later
28 * In futex wake up scenarios where no tasks are blocked on a futex, taking
34 * CPU 0 CPU 1
40 * sys_futex(WAKE, futex);
50 * This would cause the waiter on CPU 0 to wait forever because it
58 * CPU 0 CPU 1
64 * smp_mb(); (A) <-- paired with -.
70 * | sys_futex(WAKE, futex);
73 * `--------> smp_mb(); (B)
80 * waiters--; (b) unlock(hash_bucket(futex));
[all …]
/linux-6.8/lib/
DKconfig.kfence1 # SPDX-License-Identifier: GPL-2.0-only
7 bool "KFENCE: low-overhead sampling-based memory safety error detector"
12 KFENCE is a low-overhead sampling-based detector of heap out-of-bounds
13 access, use-after-free, and invalid-free errors. KFENCE is designed
17 See <file:Documentation/dev-tools/kfence.rst> for more details.
23 environments. If your kernel targets production use, and cannot
37 setting "kfence.sample_interval" to a non-zero value enables KFENCE.
49 bool "Use a deferrable timer to trigger allocations"
51 Use a deferrable timer to trigger allocations. This avoids forcing
52 CPU wake-ups if the system is idle, at the risk of a less predictable
[all …]
/linux-6.8/kernel/rcu/
Dtree_nocb.h1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Read-Copy Update mechanism for mutual exclusion (tree-based version)
4 * Internal non-public definitions that provide either classic
21 return lockdep_is_held(&rdp->nocb_lock); in rcu_lockdep_is_held_nocb()
27 if (!rdp->nocb_cb_kthread || !rdp->nocb_gp_kthread) in rcu_current_is_nocb_kthread()
30 if (current == rdp->nocb_cb_kthread || current == rdp->nocb_gp_kthread) in rcu_current_is_nocb_kthread()
37 * Offload callback processing from the boot-time-specified set of CPUs
39 * created that pull the callbacks from the corresponding CPU, wait for
43 * invoke callbacks. Each GP kthread invokes its own CBs. The no-CBs CPUs
46 * in which case each kthread actively polls its CPU. (Which isn't so great
[all …]
/linux-6.8/arch/arm64/kvm/
Darm.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
9 #include <linux/entry-kvm.h>
78 if (cap->flags) in kvm_vm_ioctl_enable_cap()
79 return -EINVAL; in kvm_vm_ioctl_enable_cap()
81 switch (cap->cap) { in kvm_vm_ioctl_enable_cap()
85 &kvm->arch.flags); in kvm_vm_ioctl_enable_cap()
88 mutex_lock(&kvm->lock); in kvm_vm_ioctl_enable_cap()
89 if (!system_supports_mte() || kvm->created_vcpus) { in kvm_vm_ioctl_enable_cap()
90 r = -EINVAL; in kvm_vm_ioctl_enable_cap()
[all …]
/linux-6.8/kernel/sched/
Ddeadline.c1 // SPDX-License-Identifier: GPL-2.0
24 * guard against timer DoS.
59 return dl_se->dl_server; in dl_server()
75 struct rq *rq = dl_se->rq; in rq_of_dl_se()
85 return &rq_of_dl_se(dl_se)->dl; in dl_rq_of_se()
90 return !RB_EMPTY_NODE(&dl_se->rb_node); in on_dl_rq()
96 return dl_se->pi_se; in pi_of()
120 return &cpu_rq(i)->rd->dl_bw; in dl_bw_of()
125 struct root_domain *rd = cpu_rq(i)->rd; in dl_bw_cpus()
131 if (cpumask_subset(rd->span, cpu_active_mask)) in dl_bw_cpus()
[all …]
Dcore.c1 // SPDX-License-Identifier: GPL-2.0-only
7 * Copyright (C) 1991-2002 Linus Torvalds
71 # include <linux/entry-common.h>
96 #include "../../io_uring/io-wq.h"
162 if (p->sched_class == &stop_sched_class) /* trumps deadline */ in __task_prio()
163 return -2; in __task_prio()
165 if (rt_prio(p->prio)) /* includes deadline */ in __task_prio()
166 return p->prio; /* [-1, 99] */ in __task_prio()
168 if (p->sched_class == &idle_sched_class) in __task_prio()
188 if (-pa < -pb) in prio_less()
[all …]
/linux-6.8/Documentation/dev-tools/
Dkfence.rst1 .. SPDX-License-Identifier: GPL-2.0
4 Kernel Electric-Fence (KFENCE)
7 Kernel Electric-Fence (KFENCE) is a low-overhead sampling-based memory safety
8 error detector. KFENCE detects heap out-of-bounds access, use-after-free, and
9 invalid-free errors.
15 non-production test workloads. One way to quickly achieve a large enough total
19 -----
26 ``kfence.sample_interval`` to non-zero value), configure the kernel with::
44 The sample interval controls a timer that sets up KFENCE allocations. By
45 default, to keep the real sample interval predictable, the normal timer also
[all …]
/linux-6.8/drivers/usb/musb/
Dtusb6010.c1 // SPDX-License-Identifier: GPL-2.0
9 * - Driver assumes that interface to external host (main CPU) is
27 #include <linux/dma-mapping.h>
51 void __iomem *tbase = musb->ctrl_base; in tusb_get_revision()
68 void __iomem *tbase = musb->ctrl_base; in tusb_print_revision()
71 rev = musb->tusb_revision; in tusb_print_revision()
96 * Workaround for spontaneous WBUS wake-up issue #2 for tusb3.0.
101 void __iomem *tbase = musb->ctrl_base; in tusb_wbus_quirk()
114 dev_dbg(musb->controller, "Enabled tusb wbus quirk ctrl %08x ena %08x\n", in tusb_wbus_quirk()
123 dev_dbg(musb->controller, "Disabled tusb wbus quirk ctrl %08x ena %08x\n", in tusb_wbus_quirk()
[all …]
/linux-6.8/kernel/power/
DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
9 suspend-to-RAM state (e.g. the ACPI S3 state).
30 user-space before invoking suspend. There's a run-time switch
32 This setting changes the default for the run-tim switch. Say Y
60 for suspend states like suspend-to-RAM (STR) often don't work very
72 <file:Documentation/power/swsusp-and-swap-files.rst>).
75 meantime you cannot use the swap partition(s)/file(s) involved in
100 The default resume partition is the partition that the suspend-
101 to-disk implementation will look for a suspended disk image.
135 non-zero numbered CPU, it may define ARCH_SUSPEND_NONZERO_CPU. This
[all …]
/linux-6.8/drivers/power/reset/
Dat91-sama5d2_shdwc.c2 * Atmel SAMA5D2-Compatible Shutdown Controller (SHDWC) driver.
8 * Evolved from driver at91-poweroff.c.
15 * - addition to status of other wake-up inputs [1 - 15]
16 * - Analog Comparator wake-up alarm
17 * - Serial RX wake-up alarm
18 * - low power debouncer
50 #define AT91_SHDW_WUIR 0x0c /* Shutdown Wake-up Inputs Register */
58 #define SHDW_WK_PIN(reg, cfg) ((reg) & AT91_SHDW_WKUPIS((cfg)->wkup_pin_input))
59 #define SHDW_RTCWK(reg, cfg) (((reg) >> ((cfg)->sr_rtcwk_shift)) & 0x1)
60 #define SHDW_RTTWK(reg, cfg) (((reg) >> ((cfg)->sr_rttwk_shift)) & 0x1)
[all …]
/linux-6.8/Documentation/admin-guide/pm/
Dcpuidle.rst1 .. SPDX-License-Identifier: GPL-2.0
5 .. |cpufreq| replace:: :doc:`CPU Performance Scaling <cpufreq>`
8 CPU Idle Time Management
27 CPU idle time management is an energy-efficiency feature concerned about using
31 ------------
33 CPU idle time management operates on CPUs as seen by the *CPU scheduler* (that
37 software as individual single-core processors. In other words, a CPU is an
43 program) at a time, it is a CPU. In that case, if the hardware is asked to
46 Second, if the processor is multi-core, each core in it is able to follow at
61 Finally, each core in a multi-core processor may be able to follow more than one
[all …]
/linux-6.8/arch/x86/kernel/acpi/
Dboot.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * boot.c - Architecture-Specific Low-Level ACPI Boot Support
22 #include <linux/efi-bgrt.h>
81 * ->device_hotplug_lock
82 * ->acpi_ioapic_lock
83 * ->ioapic_lock
85 * ->acpi_ioapic_lock
86 * ->ioapic_mutex
87 * ->ioapic_lock
92 /* --------------------------------------------------------------------------
[all …]
/linux-6.8/drivers/acpi/
DKconfig1 # SPDX-License-Identifier: GPL-2.0
19 Linux requires an ACPI-compliant platform (hardware/firmware),
20 and assumes the presence of OS-directed configuration and power
26 the Plug-and-Play BIOS specification (PnP BIOS), the
36 ACPI is an open industry specification originally co-developed by
37 Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba. Currently,
72 Enable in-kernel debugging of AML facilities: statistics,
130 This option enables a DMI-based quirk for the above Dell machine (so
183 performs user-defined actions such as shutting down the system.
184 This is necessary for software-controlled poweroff.
[all …]
/linux-6.8/drivers/tty/
Dmips_ejtag_fdc.c1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 2007-2015 Imagination Technologies Ltd
25 #include <linux/timer.h>
87 * struct mips_ejtag_fdc_tty_port - Wrapper struct for FDC tty_port.
117 * struct mips_ejtag_fdc_tty - Driver data for FDC as a whole.
120 * @cpu: CPU number for this FDC.
123 * @ports: Per-channel data.
137 * @poll_timer: Timer for polling for interrupt events when @irq < 0.
144 unsigned int cpu; member
174 __raw_writel(data, priv->reg + offs); in mips_ejtag_fdc_write()
[all …]
/linux-6.8/Documentation/scheduler/
Dsched-deadline.rst12 3. Scheduling Real-Time Tasks
18 4.1 System-wide settings
22 5. Tasks CPU affinity
33 system behavior. As for -rt (group) scheduling, it is assumed that root users
50 ------------------
63 (clearly, if the system is overloaded this guarantee cannot be respected).
70 with the "traditional" real-time task model (see Section 3) can effectively
76 - Each SCHED_DEADLINE task is characterized by the "runtime",
79 - The state of the task is described by a "scheduling deadline", and
82 - When a SCHED_DEADLINE task wakes up (becomes ready for execution),
[all …]
/linux-6.8/kernel/
Dsoftirq.c1 // SPDX-License-Identifier: GPL-2.0-only
7 * Rewritten. Old one was good in 2.2, but in 2.3 it was immoral. --ANK (990903)
20 #include <linux/cpu.h>
37 - No shared variables, all the data are CPU local.
38 - If a softirq needs serialization, let it serialize itself
40 - Even if softirq is serialized, only local cpu is marked for
41 execution. Hence, we get something sort of weak cpu binding.
46 - NET RX softirq. It is multithreaded and does not require
48 - NET TX softirq. It kicks software netdevice queues, hence
51 - Tasklets: serialized wrt itself.
[all …]
/linux-6.8/arch/arm/mach-omap1/
Dpm.c2 * linux/arch/arm/mach-omap1/pm.c
47 #include <linux/cpu.h>
55 #include <linux/soc/ti/omap1-io.h>
57 #include <linux/omap-dma.h>
58 #include <clocksource/timer-ti-dm.h>
91 return -EINVAL; in idle_store()
129 * tests above as soon as drivers, timer and DMA code have been fixed. in omap1_pm_idle()
163 * Turn off all interrupts except GPIO bank 1, L1-2nd level cascade, in omap_pm_wakeup_setup()
166 * wake up to a GPIO interrupt. in omap_pm_wakeup_setup()
263 /* (Step 3 removed - we now allow deep sleep by default) */ in omap1_pm_suspend()
[all …]
/linux-6.8/Documentation/kernel-hacking/
Dhacking.rst20 this document, being grossly under-qualified, but I always wanted to
30 - not associated with any process, serving a hardware interrupt;
32 - not associated with any process, serving a softirq or tasklet;
34 - running in kernel space, associated with a process (user context);
36 - running a process in user space.
40 by the ones above it. For example, while a softirq is running on a CPU,
45 to become truly non-preemptable.
48 ------------
69 -------------------------------
71 Timer ticks, network cards and keyboard are examples of real hardware
[all …]
/linux-6.8/arch/powerpc/include/asm/
Dsmu.h1 /* SPDX-License-Identifier: GPL-2.0 */
25 * These commands are used to retrieve the sdb-partition-XX datas from
31 * - 0..1 : partition address
32 * - 2 : a byte containing the partition ID
33 * - 3 : length (maybe other bits are rest of header ?)
53 * ---------------------
66 * ------------------------
88 * timer, but also a PRAM
115 * 0: bus number (from device-tree usually, SMU has lots of busses !)
128 * - 0x00: Simple transfer
[all …]

1234567