mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Osama AbdelkaderandWill Deacon
7dc6922f7f
init_irq_stacks() and init_irq_scs() may fail when arch_alloc_vmap_stack or scs_alloc return NULL. Return -ENOMEM from both and call panic() once from init_IRQ(), covering per-CPU IRQ stacks and shadow IRQ stacks consistently. Signed-off-by: Osama Abdelkader <osama.abdelkader@gmail.com> Signed-off-by: Will Deacon <will@kernel.org>
136 lines
3.0 KiB
C
136 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Based on arch/arm/kernel/irq.c
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*
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* Copyright (C) 1992 Linus Torvalds
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* Modifications for ARM processor Copyright (C) 1995-2000 Russell King.
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* Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation.
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* Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and
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* Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>.
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* Copyright (C) 2012 ARM Ltd.
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*/
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#include <linux/errno.h>
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#include <linux/hardirq.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/irqchip.h>
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#include <linux/kprobes.h>
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#include <linux/memory.h>
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#include <linux/scs.h>
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#include <linux/seq_file.h>
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#include <linux/smp.h>
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#include <linux/vmalloc.h>
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#include <asm/daifflags.h>
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#include <asm/exception.h>
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#include <asm/numa.h>
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#include <asm/softirq_stack.h>
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#include <asm/stacktrace.h>
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#include <asm/vmap_stack.h>
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/* Only access this in an NMI enter/exit */
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DEFINE_PER_CPU(struct nmi_ctx, nmi_contexts);
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DEFINE_PER_CPU(unsigned long *, irq_stack_ptr);
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DECLARE_PER_CPU(unsigned long *, irq_shadow_call_stack_ptr);
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#ifdef CONFIG_SHADOW_CALL_STACK
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DEFINE_PER_CPU(unsigned long *, irq_shadow_call_stack_ptr);
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#endif
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static int __init init_irq_scs(void)
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{
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int cpu;
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void *s;
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if (!scs_is_enabled())
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return 0;
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for_each_possible_cpu(cpu) {
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s = scs_alloc(early_cpu_to_node(cpu));
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if (!s)
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return -ENOMEM;
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per_cpu(irq_shadow_call_stack_ptr, cpu) = s;
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}
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return 0;
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}
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static int __init init_irq_stacks(void)
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{
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int cpu;
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unsigned long *p;
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for_each_possible_cpu(cpu) {
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p = arch_alloc_vmap_stack(IRQ_STACK_SIZE, early_cpu_to_node(cpu));
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if (!p)
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return -ENOMEM;
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per_cpu(irq_stack_ptr, cpu) = p;
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}
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return 0;
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}
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#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK
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static void ____do_softirq(struct pt_regs *regs)
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{
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__do_softirq();
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}
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void do_softirq_own_stack(void)
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{
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call_on_irq_stack(NULL, ____do_softirq);
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}
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#endif
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static void default_handle_irq(struct pt_regs *regs)
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{
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panic("IRQ taken without a root IRQ handler\n");
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}
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static void default_handle_fiq(struct pt_regs *regs)
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{
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panic("FIQ taken without a root FIQ handler\n");
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}
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void (*handle_arch_irq)(struct pt_regs *) __ro_after_init = default_handle_irq;
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void (*handle_arch_fiq)(struct pt_regs *) __ro_after_init = default_handle_fiq;
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int __init set_handle_irq(void (*handle_irq)(struct pt_regs *))
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{
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if (handle_arch_irq != default_handle_irq)
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return -EBUSY;
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handle_arch_irq = handle_irq;
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pr_info("Root IRQ handler: %ps\n", handle_irq);
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return 0;
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}
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int __init set_handle_fiq(void (*handle_fiq)(struct pt_regs *))
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{
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if (handle_arch_fiq != default_handle_fiq)
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return -EBUSY;
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handle_arch_fiq = handle_fiq;
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pr_info("Root FIQ handler: %ps\n", handle_fiq);
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return 0;
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}
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void __init init_IRQ(void)
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{
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if (init_irq_stacks() || init_irq_scs())
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panic("Failed to allocate IRQ stack resources\n");
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irqchip_init();
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if (system_uses_irq_prio_masking()) {
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/*
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* Now that we have a stack for our IRQ handler, set
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* the PMR/PSR pair to a consistent state.
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*/
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WARN_ON(read_sysreg(daif) & PSR_A_BIT);
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local_daif_restore(DAIF_PROCCTX_NOIRQ);
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}
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}
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