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76 lines
2.0 KiB
76 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar |
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* |
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* This file contains the lowest level x86_64-specific interrupt |
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* entry and irq statistics code. All the remaining irq logic is |
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* done by the generic kernel/irq/ code and in the |
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* x86_64-specific irq controller code. (e.g. i8259.c and |
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* io_apic.c.) |
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*/ |
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#include <linux/kernel_stat.h> |
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#include <linux/interrupt.h> |
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#include <linux/irq.h> |
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#include <linux/seq_file.h> |
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#include <linux/delay.h> |
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#include <linux/ftrace.h> |
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#include <linux/uaccess.h> |
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#include <linux/smp.h> |
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#include <linux/sched/task_stack.h> |
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#include <asm/cpu_entry_area.h> |
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#include <asm/softirq_stack.h> |
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#include <asm/irq_stack.h> |
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#include <asm/io_apic.h> |
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#include <asm/apic.h> |
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DEFINE_PER_CPU_PAGE_ALIGNED(struct irq_stack, irq_stack_backing_store) __visible; |
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DECLARE_INIT_PER_CPU(irq_stack_backing_store); |
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#ifdef CONFIG_VMAP_STACK |
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/* |
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* VMAP the backing store with guard pages |
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*/ |
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static int map_irq_stack(unsigned int cpu) |
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{ |
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char *stack = (char *)per_cpu_ptr(&irq_stack_backing_store, cpu); |
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struct page *pages[IRQ_STACK_SIZE / PAGE_SIZE]; |
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void *va; |
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int i; |
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for (i = 0; i < IRQ_STACK_SIZE / PAGE_SIZE; i++) { |
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phys_addr_t pa = per_cpu_ptr_to_phys(stack + (i << PAGE_SHIFT)); |
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pages[i] = pfn_to_page(pa >> PAGE_SHIFT); |
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} |
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va = vmap(pages, IRQ_STACK_SIZE / PAGE_SIZE, VM_MAP, PAGE_KERNEL); |
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if (!va) |
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return -ENOMEM; |
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/* Store actual TOS to avoid adjustment in the hotpath */ |
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per_cpu(hardirq_stack_ptr, cpu) = va + IRQ_STACK_SIZE - 8; |
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return 0; |
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} |
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#else |
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/* |
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* If VMAP stacks are disabled due to KASAN, just use the per cpu |
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* backing store without guard pages. |
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*/ |
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static int map_irq_stack(unsigned int cpu) |
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{ |
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void *va = per_cpu_ptr(&irq_stack_backing_store, cpu); |
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/* Store actual TOS to avoid adjustment in the hotpath */ |
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per_cpu(hardirq_stack_ptr, cpu) = va + IRQ_STACK_SIZE - 8; |
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return 0; |
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} |
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#endif |
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int irq_init_percpu_irqstack(unsigned int cpu) |
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{ |
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if (per_cpu(hardirq_stack_ptr, cpu)) |
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return 0; |
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return map_irq_stack(cpu); |
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}
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