mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-08-05 16:54:27 +00:00
c4a5699d5c
With VMAP_STACK always enabled on arm64, drop the CONFIG_VMAP_STACK checks and legacy irq stack allocation from arch/arm64/kernel/irq.c. The code now unconditionally uses the VMAP_STACK path for irq stack initialization, simplifying the logic. Signed-off-by: Breno Leitao <leitao@debian.org> Acked-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Mark Rutland <mark.rutland@arm.com> Link: https://lore.kernel.org/r/20250707-arm64_vmap-v1-4-8de98ca0f91c@debian.org Signed-off-by: Will Deacon <will@kernel.org>
124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
// 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/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 void init_irq_scs(void)
|
|
{
|
|
int cpu;
|
|
|
|
if (!scs_is_enabled())
|
|
return;
|
|
|
|
for_each_possible_cpu(cpu)
|
|
per_cpu(irq_shadow_call_stack_ptr, cpu) =
|
|
scs_alloc(early_cpu_to_node(cpu));
|
|
}
|
|
|
|
static void __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));
|
|
per_cpu(irq_stack_ptr, cpu) = p;
|
|
}
|
|
}
|
|
|
|
#ifndef CONFIG_PREEMPT_RT
|
|
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)
|
|
{
|
|
init_irq_stacks();
|
|
init_irq_scs();
|
|
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);
|
|
}
|
|
}
|