cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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irq.c (2272B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
      4 */
      5#include <linux/kernel.h>
      6#include <linux/acpi.h>
      7#include <linux/atomic.h>
      8#include <linux/delay.h>
      9#include <linux/init.h>
     10#include <linux/interrupt.h>
     11#include <linux/irqchip.h>
     12#include <linux/kernel_stat.h>
     13#include <linux/proc_fs.h>
     14#include <linux/mm.h>
     15#include <linux/sched.h>
     16#include <linux/seq_file.h>
     17#include <linux/kallsyms.h>
     18#include <linux/uaccess.h>
     19
     20#include <asm/irq.h>
     21#include <asm/loongson.h>
     22#include <asm/setup.h>
     23
     24DEFINE_PER_CPU(unsigned long, irq_stack);
     25DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
     26EXPORT_PER_CPU_SYMBOL(irq_stat);
     27
     28struct irq_domain *cpu_domain;
     29struct irq_domain *liointc_domain;
     30struct irq_domain *pch_lpc_domain;
     31struct irq_domain *pch_msi_domain[MAX_IO_PICS];
     32struct irq_domain *pch_pic_domain[MAX_IO_PICS];
     33
     34/*
     35 * 'what should we do if we get a hw irq event on an illegal vector'.
     36 * each architecture has to answer this themselves.
     37 */
     38void ack_bad_irq(unsigned int irq)
     39{
     40	pr_warn("Unexpected IRQ # %d\n", irq);
     41}
     42
     43atomic_t irq_err_count;
     44
     45asmlinkage void spurious_interrupt(void)
     46{
     47	atomic_inc(&irq_err_count);
     48}
     49
     50int arch_show_interrupts(struct seq_file *p, int prec)
     51{
     52#ifdef CONFIG_SMP
     53	show_ipi_list(p, prec);
     54#endif
     55	seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
     56	return 0;
     57}
     58
     59void __init init_IRQ(void)
     60{
     61	int i;
     62#ifdef CONFIG_SMP
     63	int r, ipi_irq;
     64	static int ipi_dummy_dev;
     65#endif
     66	unsigned int order = get_order(IRQ_STACK_SIZE);
     67	struct page *page;
     68
     69	clear_csr_ecfg(ECFG0_IM);
     70	clear_csr_estat(ESTATF_IP);
     71
     72	irqchip_init();
     73#ifdef CONFIG_SMP
     74	ipi_irq = EXCCODE_IPI - EXCCODE_INT_START;
     75	irq_set_percpu_devid(ipi_irq);
     76	r = request_percpu_irq(ipi_irq, loongson3_ipi_interrupt, "IPI", &ipi_dummy_dev);
     77	if (r < 0)
     78		panic("IPI IRQ request failed\n");
     79#endif
     80
     81	for (i = 0; i < NR_IRQS; i++)
     82		irq_set_noprobe(i);
     83
     84	for_each_possible_cpu(i) {
     85		page = alloc_pages_node(cpu_to_node(i), GFP_KERNEL, order);
     86
     87		per_cpu(irq_stack, i) = (unsigned long)page_address(page);
     88		pr_debug("CPU%d IRQ stack at 0x%lx - 0x%lx\n", i,
     89			per_cpu(irq_stack, i), per_cpu(irq_stack, i) + IRQ_STACK_SIZE);
     90	}
     91
     92	set_csr_ecfg(ECFGF_IP0 | ECFGF_IP1 | ECFGF_IP2 | ECFGF_IPI | ECFGF_PMC);
     93}