Contributors: 14
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Mark Rutland |
175 |
41.08% |
6 |
25.00% |
| Marc Zyngier |
86 |
20.19% |
2 |
8.33% |
| Osama Abdelkader |
50 |
11.74% |
1 |
4.17% |
| Sami Tolvanen |
30 |
7.04% |
1 |
4.17% |
| Qi Zheng |
23 |
5.40% |
1 |
4.17% |
| Li Wei |
17 |
3.99% |
1 |
4.17% |
| Julien Thierry |
14 |
3.29% |
2 |
8.33% |
| James Morse |
8 |
1.88% |
2 |
8.33% |
| AKASHI Takahiro |
6 |
1.41% |
1 |
4.17% |
| Huang Shijie |
6 |
1.41% |
2 |
8.33% |
| Catalin Marinas |
4 |
0.94% |
2 |
8.33% |
| Ryo Takakura |
3 |
0.70% |
1 |
4.17% |
| Thomas Gleixner |
2 |
0.47% |
1 |
4.17% |
| Ard Biesheuvel |
2 |
0.47% |
1 |
4.17% |
| Total |
426 |
|
24 |
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Based on arch/arm/kernel/irq.c
*
* Copyright (C) 1992 Linus Torvalds
* Modifications for ARM processor Copyright (C) 1995-2000 Russell King.
* Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation.
* Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and
* Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>.
* Copyright (C) 2012 ARM Ltd.
*/
#include <linux/errno.h>
#include <linux/hardirq.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/kprobes.h>
#include <linux/memory.h>
#include <linux/scs.h>
#include <linux/seq_file.h>
#include <linux/smp.h>
#include <linux/vmalloc.h>
#include <asm/daifflags.h>
#include <asm/exception.h>
#include <asm/numa.h>
#include <asm/softirq_stack.h>
#include <asm/stacktrace.h>
#include <asm/vmap_stack.h>
/* Only access this in an NMI enter/exit */
DEFINE_PER_CPU(struct nmi_ctx, nmi_contexts);
DEFINE_PER_CPU(unsigned long *, irq_stack_ptr);
DECLARE_PER_CPU(unsigned long *, irq_shadow_call_stack_ptr);
#ifdef CONFIG_SHADOW_CALL_STACK
DEFINE_PER_CPU(unsigned long *, irq_shadow_call_stack_ptr);
#endif
static int __init init_irq_scs(void)
{
int cpu;
void *s;
if (!scs_is_enabled())
return 0;
for_each_possible_cpu(cpu) {
s = scs_alloc(early_cpu_to_node(cpu));
if (!s)
return -ENOMEM;
per_cpu(irq_shadow_call_stack_ptr, cpu) = s;
}
return 0;
}
static int __init init_irq_stacks(void)
{
int cpu;
unsigned long *p;
for_each_possible_cpu(cpu) {
p = arch_alloc_vmap_stack(IRQ_STACK_SIZE, early_cpu_to_node(cpu));
if (!p)
return -ENOMEM;
per_cpu(irq_stack_ptr, cpu) = p;
}
return 0;
}
#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK
static void ____do_softirq(struct pt_regs *regs)
{
__do_softirq();
}
void do_softirq_own_stack(void)
{
call_on_irq_stack(NULL, ____do_softirq);
}
#endif
static void default_handle_irq(struct pt_regs *regs)
{
panic("IRQ taken without a root IRQ handler\n");
}
static void default_handle_fiq(struct pt_regs *regs)
{
panic("FIQ taken without a root FIQ handler\n");
}
void (*handle_arch_irq)(struct pt_regs *) __ro_after_init = default_handle_irq;
void (*handle_arch_fiq)(struct pt_regs *) __ro_after_init = default_handle_fiq;
int __init set_handle_irq(void (*handle_irq)(struct pt_regs *))
{
if (handle_arch_irq != default_handle_irq)
return -EBUSY;
handle_arch_irq = handle_irq;
pr_info("Root IRQ handler: %ps\n", handle_irq);
return 0;
}
int __init set_handle_fiq(void (*handle_fiq)(struct pt_regs *))
{
if (handle_arch_fiq != default_handle_fiq)
return -EBUSY;
handle_arch_fiq = handle_fiq;
pr_info("Root FIQ handler: %ps\n", handle_fiq);
return 0;
}
void __init init_IRQ(void)
{
if (init_irq_stacks() || init_irq_scs())
panic("Failed to allocate IRQ stack resources\n");
irqchip_init();
if (system_uses_irq_prio_masking()) {
/*
* Now that we have a stack for our IRQ handler, set
* the PMR/PSR pair to a consistent state.
*/
WARN_ON(read_sysreg(daif) & PSR_A_BIT);
local_daif_restore(DAIF_PROCCTX_NOIRQ);
}
}