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MIPS: Introduce irq_stack

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Allocate a per-cpu irq stack for use within interrupt handlers.

Also add a utility function on_irq_stack to determine if a given stack
pointer is within the irq stack for that cpu.

Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Acked-by: Jason A. Donenfeld <jason@zx2c4.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Aaron Tomlin <atomlin@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14740/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Matt Redfearn 2016-12-19 14:20:56 +00:00 committed by Ralf Baechle
parent ae2f5e5ed0
commit fe8bd18ffe
3 changed files with 24 additions and 0 deletions
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12
arch/mips/include/asm/irq.h
View file

@ -17,6 +17,18 @@
#include <irq.h>
#define IRQ_STACK_SIZE THREAD_SIZE
extern void *irq_stack[NR_CPUS];
static inline bool on_irq_stack(int cpu, unsigned long sp)
{
unsigned long low = (unsigned long)irq_stack[cpu];
unsigned long high = low + IRQ_STACK_SIZE;
return (low <= sp && sp <= high);
}
#ifdef CONFIG_I8259
static inline int irq_canonicalize(int irq)
{

1
arch/mips/kernel/asm-offsets.c
View file

@ -102,6 +102,7 @@ void output_thread_info_defines(void)
OFFSET(TI_REGS, thread_info, regs);
DEFINE(_THREAD_SIZE, THREAD_SIZE);
DEFINE(_THREAD_MASK, THREAD_MASK);
DEFINE(_IRQ_STACK_SIZE, IRQ_STACK_SIZE);
BLANK();
}

11
arch/mips/kernel/irq.c
View file

@ -25,6 +25,8 @@
#include <linux/atomic.h>
#include <linux/uaccess.h>
void *irq_stack[NR_CPUS];
/*
* 'what should we do if we get a hw irq event on an illegal vector'.
* each architecture has to answer this themselves.
@ -58,6 +60,15 @@ void __init init_IRQ(void)
clear_c0_status(ST0_IM);
arch_init_irq();
for_each_possible_cpu(i) {
int irq_pages = IRQ_STACK_SIZE / PAGE_SIZE;
void *s = (void *)__get_free_pages(GFP_KERNEL, irq_pages);
irq_stack[i] = s;
pr_debug("CPU%d IRQ stack at 0x%p - 0x%p\n", i,
irq_stack[i], irq_stack[i] + IRQ_STACK_SIZE);
}
}
#ifdef CONFIG_DEBUG_STACKOVERFLOW