Contributors: 12
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Andrew Lutomirski |
147 |
56.76% |
2 |
10.53% |
| Thomas Gleixner |
76 |
29.34% |
5 |
26.32% |
| Andi Kleen |
14 |
5.41% |
2 |
10.53% |
| Ingo Molnar |
4 |
1.54% |
2 |
10.53% |
| Ashok Raj |
3 |
1.16% |
1 |
5.26% |
| Nicolai Stange |
3 |
1.16% |
1 |
5.26% |
| Brian Gerst |
3 |
1.16% |
1 |
5.26% |
| Jaswinder Singh Rajput |
3 |
1.16% |
1 |
5.26% |
| Frédéric Weisbecker |
3 |
1.16% |
1 |
5.26% |
| Greg Kroah-Hartman |
1 |
0.39% |
1 |
5.26% |
| Dave Jones |
1 |
0.39% |
1 |
5.26% |
| Christoph Hellwig |
1 |
0.39% |
1 |
5.26% |
| Total |
259 |
|
19 |
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
*
* This file contains the lowest level x86_64-specific interrupt
* entry and irq statistics code. All the remaining irq logic is
* done by the generic kernel/irq/ code and in the
* x86_64-specific irq controller code. (e.g. i8259.c and
* io_apic.c.)
*/
#include <linux/kernel_stat.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/seq_file.h>
#include <linux/delay.h>
#include <linux/ftrace.h>
#include <linux/uaccess.h>
#include <linux/smp.h>
#include <linux/sched/task_stack.h>
#include <asm/cpu_entry_area.h>
#include <asm/softirq_stack.h>
#include <asm/irq_stack.h>
#include <asm/io_apic.h>
#include <asm/apic.h>
DEFINE_PER_CPU_PAGE_ALIGNED(struct irq_stack, irq_stack_backing_store) __visible;
DECLARE_INIT_PER_CPU(irq_stack_backing_store);
#ifdef CONFIG_VMAP_STACK
/*
* VMAP the backing store with guard pages
*/
static int map_irq_stack(unsigned int cpu)
{
char *stack = (char *)per_cpu_ptr(&irq_stack_backing_store, cpu);
struct page *pages[IRQ_STACK_SIZE / PAGE_SIZE];
void *va;
int i;
for (i = 0; i < IRQ_STACK_SIZE / PAGE_SIZE; i++) {
phys_addr_t pa = per_cpu_ptr_to_phys(stack + (i << PAGE_SHIFT));
pages[i] = pfn_to_page(pa >> PAGE_SHIFT);
}
va = vmap(pages, IRQ_STACK_SIZE / PAGE_SIZE, VM_MAP, PAGE_KERNEL);
if (!va)
return -ENOMEM;
/* Store actual TOS to avoid adjustment in the hotpath */
per_cpu(hardirq_stack_ptr, cpu) = va + IRQ_STACK_SIZE - 8;
return 0;
}
#else
/*
* If VMAP stacks are disabled due to KASAN, just use the per cpu
* backing store without guard pages.
*/
static int map_irq_stack(unsigned int cpu)
{
void *va = per_cpu_ptr(&irq_stack_backing_store, cpu);
/* Store actual TOS to avoid adjustment in the hotpath */
per_cpu(hardirq_stack_ptr, cpu) = va + IRQ_STACK_SIZE - 8;
return 0;
}
#endif
int irq_init_percpu_irqstack(unsigned int cpu)
{
if (per_cpu(hardirq_stack_ptr, cpu))
return 0;
return map_irq_stack(cpu);
}