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70 lines
1.8 KiB
70 lines
1.8 KiB
From: Matt Redfearn <matt.redfearn@imgtec.com>
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Date: Mon, 19 Dec 2016 14:20:56 +0000
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Subject: [PATCH] MIPS: Introduce irq_stack
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Allocate a per-cpu irq stack for use within interrupt handlers.
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Also add a utility function on_irq_stack to determine if a given stack
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pointer is within the irq stack for that cpu.
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Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
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---
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--- a/arch/mips/include/asm/irq.h
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+++ b/arch/mips/include/asm/irq.h
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@@ -17,6 +17,18 @@
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#include <irq.h>
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+#define IRQ_STACK_SIZE THREAD_SIZE
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+
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+extern void *irq_stack[NR_CPUS];
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+
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+static inline bool on_irq_stack(int cpu, unsigned long sp)
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+{
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+ unsigned long low = (unsigned long)irq_stack[cpu];
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+ unsigned long high = low + IRQ_STACK_SIZE;
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+
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+ return (low <= sp && sp <= high);
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+}
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+
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#ifdef CONFIG_I8259
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static inline int irq_canonicalize(int irq)
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{
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--- a/arch/mips/kernel/asm-offsets.c
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+++ b/arch/mips/kernel/asm-offsets.c
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@@ -101,6 +101,7 @@ void output_thread_info_defines(void)
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OFFSET(TI_REGS, thread_info, regs);
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DEFINE(_THREAD_SIZE, THREAD_SIZE);
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DEFINE(_THREAD_MASK, THREAD_MASK);
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+ DEFINE(_IRQ_STACK_SIZE, IRQ_STACK_SIZE);
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BLANK();
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}
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--- a/arch/mips/kernel/irq.c
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+++ b/arch/mips/kernel/irq.c
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@@ -25,6 +25,8 @@
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#include <linux/atomic.h>
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#include <asm/uaccess.h>
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+void *irq_stack[NR_CPUS];
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+
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/*
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* 'what should we do if we get a hw irq event on an illegal vector'.
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* each architecture has to answer this themselves.
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@@ -55,6 +57,15 @@ void __init init_IRQ(void)
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irq_set_noprobe(i);
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arch_init_irq();
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+
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+ for_each_possible_cpu(i) {
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+ int irq_pages = IRQ_STACK_SIZE / PAGE_SIZE;
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+ void *s = (void *)__get_free_pages(GFP_KERNEL, irq_pages);
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+
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+ irq_stack[i] = s;
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+ pr_debug("CPU%d IRQ stack at 0x%p - 0x%p\n", i,
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+ irq_stack[i], irq_stack[i] + IRQ_STACK_SIZE);
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+ }
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}
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#ifdef CONFIG_DEBUG_STACKOVERFLOW
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