From: Peter Zijlstra <peterz@infradead.org>
To: peterz@infradead.org
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"Gautham R. Shenoy" <gautham.shenoy@amd.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Subject: [PATCH v2 21/44] arch/idle: Change arch_cpu_idle() IRQ behaviour
Date: Mon, 19 Sep 2022 12:00:00 +0200 [thread overview]
Message-ID: <20220919101521.743503410@infradead.org> (raw)
In-Reply-To: 20220919095939.761690562@infradead.org
Current arch_cpu_idle() is called with IRQs disabled, but will return
with IRQs enabled.
However, the very first thing the generic code does after calling
arch_cpu_idle() is raw_local_irq_disable(). This means that
architectures that can idle with IRQs disabled end up doing a
pointless 'enable-disable' dance.
Therefore, push this IRQ disabling into the idle function, meaning
that those architectures can avoid the pointless IRQ state flipping.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Acked-by: Mark Rutland <mark.rutland@arm.com> [arm64]
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
arch/alpha/kernel/process.c | 1 -
arch/arc/kernel/process.c | 3 +++
arch/arm/kernel/process.c | 1 -
arch/arm/mach-gemini/board-dt.c | 3 ++-
arch/arm64/kernel/idle.c | 1 -
arch/csky/kernel/process.c | 1 -
arch/csky/kernel/smp.c | 2 +-
arch/hexagon/kernel/process.c | 1 -
arch/ia64/kernel/process.c | 1 +
arch/loongarch/kernel/idle.c | 1 +
arch/microblaze/kernel/process.c | 1 -
arch/mips/kernel/idle.c | 8 +++-----
arch/nios2/kernel/process.c | 1 -
arch/openrisc/kernel/process.c | 1 +
arch/parisc/kernel/process.c | 2 --
arch/powerpc/kernel/idle.c | 5 ++---
arch/riscv/kernel/process.c | 1 -
arch/s390/kernel/idle.c | 1 -
arch/sh/kernel/idle.c | 1 +
arch/sparc/kernel/leon_pmc.c | 4 ++++
arch/sparc/kernel/process_32.c | 1 -
arch/sparc/kernel/process_64.c | 3 ++-
arch/um/kernel/process.c | 1 -
arch/x86/coco/tdx/tdx.c | 3 +++
arch/x86/kernel/process.c | 15 ++++-----------
arch/xtensa/kernel/process.c | 1 +
kernel/sched/idle.c | 2 --
27 files changed, 29 insertions(+), 37 deletions(-)
--- a/arch/alpha/kernel/process.c
+++ b/arch/alpha/kernel/process.c
@@ -57,7 +57,6 @@ EXPORT_SYMBOL(pm_power_off);
void arch_cpu_idle(void)
{
wtint(0);
- raw_local_irq_enable();
}
void arch_cpu_idle_dead(void)
--- a/arch/arc/kernel/process.c
+++ b/arch/arc/kernel/process.c
@@ -114,6 +114,8 @@ void arch_cpu_idle(void)
"sleep %0 \n"
:
:"I"(arg)); /* can't be "r" has to be embedded const */
+
+ raw_local_irq_disable();
}
#else /* ARC700 */
@@ -122,6 +124,7 @@ void arch_cpu_idle(void)
{
/* sleep, but enable both set E1/E2 (levels of interrupts) before committing */
__asm__ __volatile__("sleep 0x3 \n");
+ raw_local_irq_disable();
}
#endif
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -78,7 +78,6 @@ void arch_cpu_idle(void)
arm_pm_idle();
else
cpu_do_idle();
- raw_local_irq_enable();
}
void arch_cpu_idle_prepare(void)
--- a/arch/arm/mach-gemini/board-dt.c
+++ b/arch/arm/mach-gemini/board-dt.c
@@ -42,8 +42,9 @@ static void gemini_idle(void)
*/
/* FIXME: Enabling interrupts here is racy! */
- local_irq_enable();
+ raw_local_irq_enable();
cpu_do_idle();
+ raw_local_irq_disable();
}
static void __init gemini_init_machine(void)
--- a/arch/arm64/kernel/idle.c
+++ b/arch/arm64/kernel/idle.c
@@ -42,5 +42,4 @@ void noinstr arch_cpu_idle(void)
* tricks
*/
cpu_do_idle();
- raw_local_irq_enable();
}
--- a/arch/csky/kernel/process.c
+++ b/arch/csky/kernel/process.c
@@ -100,6 +100,5 @@ void arch_cpu_idle(void)
#ifdef CONFIG_CPU_PM_STOP
asm volatile("stop\n");
#endif
- raw_local_irq_enable();
}
#endif
--- a/arch/csky/kernel/smp.c
+++ b/arch/csky/kernel/smp.c
@@ -309,7 +309,7 @@ void arch_cpu_idle_dead(void)
while (!secondary_stack)
arch_cpu_idle();
- local_irq_disable();
+ raw_local_irq_disable();
asm volatile(
"mov sp, %0\n"
--- a/arch/hexagon/kernel/process.c
+++ b/arch/hexagon/kernel/process.c
@@ -44,7 +44,6 @@ void arch_cpu_idle(void)
{
__vmwait();
/* interrupts wake us up, but irqs are still disabled */
- raw_local_irq_enable();
}
/*
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -242,6 +242,7 @@ void arch_cpu_idle(void)
(*mark_idle)(1);
raw_safe_halt();
+ raw_local_irq_disable();
if (mark_idle)
(*mark_idle)(0);
--- a/arch/loongarch/kernel/idle.c
+++ b/arch/loongarch/kernel/idle.c
@@ -13,4 +13,5 @@ void __cpuidle arch_cpu_idle(void)
{
raw_local_irq_enable();
__arch_cpu_idle(); /* idle instruction needs irq enabled */
+ raw_local_irq_disable();
}
--- a/arch/microblaze/kernel/process.c
+++ b/arch/microblaze/kernel/process.c
@@ -140,5 +140,4 @@ int dump_fpu(struct pt_regs *regs, elf_f
void arch_cpu_idle(void)
{
- raw_local_irq_enable();
}
--- a/arch/mips/kernel/idle.c
+++ b/arch/mips/kernel/idle.c
@@ -33,13 +33,13 @@ static void __cpuidle r3081_wait(void)
{
unsigned long cfg = read_c0_conf();
write_c0_conf(cfg | R30XX_CONF_HALT);
- raw_local_irq_enable();
}
void __cpuidle r4k_wait(void)
{
raw_local_irq_enable();
__r4k_wait();
+ raw_local_irq_disable();
}
/*
@@ -57,7 +57,6 @@ void __cpuidle r4k_wait_irqoff(void)
" .set arch=r4000 \n"
" wait \n"
" .set pop \n");
- raw_local_irq_enable();
}
/*
@@ -77,7 +76,6 @@ static void __cpuidle rm7k_wait_irqoff(v
" wait \n"
" mtc0 $1, $12 # stalls until W stage \n"
" .set pop \n");
- raw_local_irq_enable();
}
/*
@@ -103,6 +101,8 @@ static void __cpuidle au1k_wait(void)
" nop \n"
" .set pop \n"
: : "r" (au1k_wait), "r" (c0status));
+
+ raw_local_irq_disable();
}
static int __initdata nowait;
@@ -245,8 +245,6 @@ void arch_cpu_idle(void)
{
if (cpu_wait)
cpu_wait();
- else
- raw_local_irq_enable();
}
#ifdef CONFIG_CPU_IDLE
--- a/arch/nios2/kernel/process.c
+++ b/arch/nios2/kernel/process.c
@@ -33,7 +33,6 @@ EXPORT_SYMBOL(pm_power_off);
void arch_cpu_idle(void)
{
- raw_local_irq_enable();
}
/*
--- a/arch/openrisc/kernel/process.c
+++ b/arch/openrisc/kernel/process.c
@@ -102,6 +102,7 @@ void arch_cpu_idle(void)
raw_local_irq_enable();
if (mfspr(SPR_UPR) & SPR_UPR_PMP)
mtspr(SPR_PMR, mfspr(SPR_PMR) | SPR_PMR_DME);
+ raw_local_irq_disable();
}
void (*pm_power_off)(void) = NULL;
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -187,8 +187,6 @@ void arch_cpu_idle_dead(void)
void __cpuidle arch_cpu_idle(void)
{
- raw_local_irq_enable();
-
/* nop on real hardware, qemu will idle sleep. */
asm volatile("or %%r10,%%r10,%%r10\n":::);
}
--- a/arch/powerpc/kernel/idle.c
+++ b/arch/powerpc/kernel/idle.c
@@ -51,10 +51,9 @@ void arch_cpu_idle(void)
* Some power_save functions return with
* interrupts enabled, some don't.
*/
- if (irqs_disabled())
- raw_local_irq_enable();
+ if (!irqs_disabled())
+ raw_local_irq_disable();
} else {
- raw_local_irq_enable();
/*
* Go into low thread priority and possibly
* low power mode.
--- a/arch/riscv/kernel/process.c
+++ b/arch/riscv/kernel/process.c
@@ -39,7 +39,6 @@ extern asmlinkage void ret_from_kernel_t
void arch_cpu_idle(void)
{
cpu_do_idle();
- raw_local_irq_enable();
}
void __show_regs(struct pt_regs *regs)
--- a/arch/s390/kernel/idle.c
+++ b/arch/s390/kernel/idle.c
@@ -66,7 +66,6 @@ void arch_cpu_idle(void)
idle->idle_count++;
account_idle_time(cputime_to_nsecs(idle_time));
raw_write_seqcount_end(&idle->seqcount);
- raw_local_irq_enable();
}
static ssize_t show_idle_count(struct device *dev,
--- a/arch/sh/kernel/idle.c
+++ b/arch/sh/kernel/idle.c
@@ -25,6 +25,7 @@ void default_idle(void)
raw_local_irq_enable();
/* Isn't this racy ? */
cpu_sleep();
+ raw_local_irq_disable();
clear_bl_bit();
}
--- a/arch/sparc/kernel/leon_pmc.c
+++ b/arch/sparc/kernel/leon_pmc.c
@@ -57,6 +57,8 @@ static void pmc_leon_idle_fixup(void)
"lda [%0] %1, %%g0\n"
:
: "r"(address), "i"(ASI_LEON_BYPASS));
+
+ raw_local_irq_disable();
}
/*
@@ -70,6 +72,8 @@ static void pmc_leon_idle(void)
/* For systems without power-down, this will be no-op */
__asm__ __volatile__ ("wr %g0, %asr19\n\t");
+
+ raw_local_irq_disable();
}
/* Install LEON Power Down function */
--- a/arch/sparc/kernel/process_32.c
+++ b/arch/sparc/kernel/process_32.c
@@ -71,7 +71,6 @@ void arch_cpu_idle(void)
{
if (sparc_idle)
(*sparc_idle)();
- raw_local_irq_enable();
}
/* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */
--- a/arch/sparc/kernel/process_64.c
+++ b/arch/sparc/kernel/process_64.c
@@ -59,7 +59,6 @@ void arch_cpu_idle(void)
{
if (tlb_type != hypervisor) {
touch_nmi_watchdog();
- raw_local_irq_enable();
} else {
unsigned long pstate;
@@ -90,6 +89,8 @@ void arch_cpu_idle(void)
"wrpr %0, %%g0, %%pstate"
: "=&r" (pstate)
: "i" (PSTATE_IE));
+
+ raw_local_irq_disable();
}
}
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -217,7 +217,6 @@ void arch_cpu_idle(void)
{
cpu_tasks[current_thread_info()->cpu].pid = os_getpid();
um_idle_sleep();
- raw_local_irq_enable();
}
int __cant_sleep(void) {
--- a/arch/x86/coco/tdx/tdx.c
+++ b/arch/x86/coco/tdx/tdx.c
@@ -223,6 +223,9 @@ void __cpuidle tdx_safe_halt(void)
*/
if (__halt(irq_disabled, do_sti))
WARN_ONCE(1, "HLT instruction emulation failed\n");
+
+ /* XXX I can't make sense of what @do_sti actually does */
+ raw_local_irq_disable();
}
static int read_msr(struct pt_regs *regs, struct ve_info *ve)
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -701,6 +701,7 @@ EXPORT_SYMBOL(boot_option_idle_override)
void __cpuidle default_idle(void)
{
raw_safe_halt();
+ raw_local_irq_disable();
}
#if defined(CONFIG_APM_MODULE) || defined(CONFIG_HALTPOLL_CPUIDLE_MODULE)
EXPORT_SYMBOL(default_idle);
@@ -806,13 +807,7 @@ static void amd_e400_idle(void)
default_idle();
- /*
- * The switch back from broadcast mode needs to be called with
- * interrupts disabled.
- */
- raw_local_irq_disable();
tick_broadcast_exit();
- raw_local_irq_enable();
}
/*
@@ -870,12 +865,10 @@ static __cpuidle void mwait_idle(void)
}
__monitor((void *)¤t_thread_info()->flags, 0, 0);
- if (!need_resched())
+ if (!need_resched()) {
__sti_mwait(0, 0);
- else
- raw_local_irq_enable();
- } else {
- raw_local_irq_enable();
+ raw_local_irq_disable();
+ }
}
__current_clr_polling();
}
--- a/arch/xtensa/kernel/process.c
+++ b/arch/xtensa/kernel/process.c
@@ -183,6 +183,7 @@ void coprocessor_flush_release_all(struc
void arch_cpu_idle(void)
{
platform_idle();
+ raw_local_irq_disable();
}
/*
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -79,7 +79,6 @@ void __weak arch_cpu_idle_dead(void) { }
void __weak arch_cpu_idle(void)
{
cpu_idle_force_poll = 1;
- raw_local_irq_enable();
}
/**
@@ -96,7 +95,6 @@ void __cpuidle default_idle_call(void)
ct_cpuidle_enter();
arch_cpu_idle();
- raw_local_irq_disable();
ct_cpuidle_exit();
start_critical_timings();
next prev parent reply other threads:[~2022-09-19 10:25 UTC|newest]
Thread overview: 87+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-19 9:59 [PATCH v2 00/44] cpuidle,rcu: Clean up the mess Peter Zijlstra
2022-09-19 9:59 ` [PATCH v2 01/44] x86/perf/amd: Remove tracing from perf_lopwr_cb() Peter Zijlstra
2022-09-19 9:59 ` [PATCH v2 02/44] x86/idle: Replace x86_idle with a static_call Peter Zijlstra
2022-09-19 9:59 ` [PATCH v2 03/44] cpuidle/poll: Ensure IRQ state is invariant Peter Zijlstra
2022-09-19 13:19 ` Frederic Weisbecker
2022-09-20 8:57 ` Peter Zijlstra
2022-09-20 10:43 ` Frederic Weisbecker
2022-09-19 9:59 ` [PATCH v2 04/44] cpuidle: Move IRQ state validation Peter Zijlstra
2022-09-19 9:59 ` [PATCH v2 05/44] cpuidle,riscv: Push RCU-idle into driver Peter Zijlstra
2022-09-19 11:54 ` Anup Patel
2022-09-19 13:46 ` Frederic Weisbecker
2022-09-19 9:59 ` [PATCH v2 06/44] cpuidle,tegra: " Peter Zijlstra
2022-09-19 14:05 ` Frederic Weisbecker
2022-09-19 9:59 ` [PATCH v2 07/44] cpuidle,psci: " Peter Zijlstra
2022-09-19 14:11 ` Frederic Weisbecker
2022-09-21 21:51 ` Kajetan Puchalski
2022-09-22 0:45 ` Guo Ren
2022-09-19 9:59 ` [PATCH v2 08/44] cpuidle,imx6: " Peter Zijlstra
2022-09-19 14:21 ` Frederic Weisbecker
2022-09-19 15:00 ` Peter Zijlstra
2022-09-20 8:58 ` Peter Zijlstra
2022-09-20 9:01 ` Frederic Weisbecker
2022-09-19 14:49 ` Frederic Weisbecker
2022-09-19 15:01 ` Peter Zijlstra
2022-09-19 15:03 ` Peter Zijlstra
2022-09-19 15:17 ` Frederic Weisbecker
2022-09-19 9:59 ` [PATCH v2 09/44] cpuidle,omap3: " Peter Zijlstra
2022-09-19 14:31 ` Frederic Weisbecker
2022-09-19 15:19 ` Peter Zijlstra
2022-09-20 8:39 ` Frederic Weisbecker
2022-09-19 14:43 ` Frederic Weisbecker
2022-09-19 9:59 ` [PATCH v2 10/44] cpuidle,armada: " Peter Zijlstra
2022-09-19 14:39 ` Frederic Weisbecker
2022-09-19 9:59 ` [PATCH v2 11/44] cpuidle,omap4: " Peter Zijlstra
2022-09-20 10:53 ` Frederic Weisbecker
2022-09-19 9:59 ` [PATCH v2 12/44] cpuidle,dt: " Peter Zijlstra
2022-10-04 11:03 ` Ulf Hansson
2022-10-04 11:43 ` Ulf Hansson
2022-11-16 15:29 ` Peter Zijlstra
2022-11-22 16:04 ` Ulf Hansson
2022-09-19 9:59 ` [PATCH v2 13/44] cpuidle: Fix ct_idle_*() usage Peter Zijlstra
2022-09-19 9:59 ` [PATCH v2 14/44] cpuidle,cpu_pm: Remove RCU fiddling from cpu_pm_{enter,exit}() Peter Zijlstra
2022-10-04 11:04 ` Ulf Hansson
2022-09-19 9:59 ` [PATCH v2 15/44] acpi_idle: Remove tracing Peter Zijlstra
2022-09-19 9:59 ` [PATCH v2 16/44] cpuidle: Annotate poll_idle() Peter Zijlstra
2022-09-19 9:59 ` [PATCH v2 17/44] objtool/idle: Validate __cpuidle code as noinstr Peter Zijlstra
2022-09-19 9:59 ` [PATCH v2 18/44] cpuidle,intel_idle: Fix CPUIDLE_FLAG_IRQ_ENABLE *again* Peter Zijlstra
2022-09-19 9:59 ` [PATCH v2 19/44] cpuidle,intel_idle: Fix CPUIDLE_FLAG_INIT_XSTATE Peter Zijlstra
2022-09-19 9:59 ` [PATCH v2 20/44] cpuidle,intel_idle: Fix CPUIDLE_FLAG_IBRS Peter Zijlstra
2022-09-19 10:00 ` Peter Zijlstra [this message]
2022-09-20 5:08 ` [PATCH v2 21/44] arch/idle: Change arch_cpu_idle() IRQ behaviour Guo Ren
2022-09-19 10:00 ` [PATCH v2 22/44] x86/tdx: Remove TDX_HCALL_ISSUE_STI Peter Zijlstra
2022-09-19 10:00 ` [PATCH v2 23/44] arm,smp: Remove trace_.*_rcuidle() usage Peter Zijlstra
2022-10-04 11:08 ` Ulf Hansson
2022-09-19 10:00 ` [PATCH v2 24/44] arm64,smp: " Peter Zijlstra
2022-09-19 10:00 ` [PATCH v2 25/44] printk: " Peter Zijlstra
2022-09-20 2:49 ` Sergey Senozhatsky
2022-09-19 10:00 ` [PATCH v2 26/44] time/tick-broadcast: Remove RCU_NONIDLE usage Peter Zijlstra
2022-09-19 10:00 ` [PATCH v2 27/44] cpuidle,sched: Remove annotations from TIF_{POLLING_NRFLAG,NEED_RESCHED} Peter Zijlstra
2022-09-19 10:00 ` [PATCH v2 28/44] cpuidle,mwait: Make noinstr clean Peter Zijlstra
2022-09-19 10:00 ` [PATCH v2 29/44] cpuidle,tdx: Make tdx " Peter Zijlstra
2022-09-19 10:00 ` [PATCH v2 30/44] cpuidle,xenpv: Make more PARAVIRT_XXL " Peter Zijlstra
2022-09-19 10:45 ` Juergen Gross
2022-09-19 10:00 ` [PATCH v2 31/44] cpuidle,nospec: Make " Peter Zijlstra
2022-09-19 10:00 ` [PATCH v2 32/44] cpuidle,acpi: " Peter Zijlstra
2022-09-19 10:00 ` [PATCH v2 33/44] ftrace: WARN on rcuidle Peter Zijlstra
2022-09-26 18:41 ` Steven Rostedt
2022-10-04 17:19 ` Mark Rutland
2022-09-19 10:00 ` [PATCH v2 34/44] cpuidle,omap3: Use WFI for omap3_pm_idle() Peter Zijlstra
2022-09-19 10:00 ` [PATCH v2 35/44] cpuidle,omap3: Push RCU-idle into omap_sram_idle() Peter Zijlstra
2022-09-19 10:00 ` [PATCH v2 36/44] cpuidle,omap4: Push RCU-idle into omap4_enter_lowpower() Peter Zijlstra
2022-09-19 10:00 ` [PATCH v2 37/44] arm,omap2: Use WFI for omap2_pm_idle() Peter Zijlstra
2022-09-27 6:21 ` Tony Lindgren
2022-09-19 10:00 ` [PATCH v2 38/44] cpuidle,powerdomain: Remove trace_.*_rcuidle() Peter Zijlstra
2022-10-04 11:12 ` Ulf Hansson
2022-09-19 10:00 ` [PATCH v2 39/44] cpuidle,clk: " Peter Zijlstra
2022-10-04 11:09 ` Ulf Hansson
2022-09-19 10:00 ` [PATCH v2 40/44] ubsan: Fix objtool UACCESS warns Peter Zijlstra
2022-09-19 10:00 ` [PATCH v2 41/44] intel_idle: Add force_irq_on module param Peter Zijlstra
2022-09-19 10:00 ` [PATCH v2 42/44] entry,kasan,x86: Disallow overriding mem*() functions Peter Zijlstra
2022-09-19 10:00 ` [PATCH v2 43/44] sched: Always inline __this_cpu_preempt_check() Peter Zijlstra
2022-09-19 10:00 ` [PATCH v2 44/44] arm64,riscv,perf: Remove RCU_NONIDLE() usage Peter Zijlstra
2022-09-19 15:21 ` [PATCH v2 00/44] cpuidle,rcu: Clean up the mess Rafael J. Wysocki
2022-09-20 12:31 ` Frederic Weisbecker
2022-09-20 14:04 ` Peter Zijlstra
2022-09-27 6:31 ` Tony Lindgren
2022-10-04 15:15 ` Ulf Hansson
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