add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/arm64/kernel/irq.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Based on arch/arm/kernel/irq.c
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  *
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@@ -7,44 +8,43 @@
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  * Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and
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  * Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>.
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  * Copyright (C) 2012 ARM Ltd.
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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  */
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-#include <linux/kernel_stat.h>
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 #include <linux/irq.h>
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 #include <linux/memory.h>
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 #include <linux/smp.h>
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+#include <linux/hardirq.h>
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 #include <linux/init.h>
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 #include <linux/irqchip.h>
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+#include <linux/kprobes.h>
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+#include <linux/scs.h>
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 #include <linux/seq_file.h>
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 #include <linux/vmalloc.h>
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+#include <asm/daifflags.h>
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 #include <asm/vmap_stack.h>
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-#include <asm/scs.h>
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-
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-unsigned long irq_err_count;
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 /* Only access this in an NMI enter/exit */
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 DEFINE_PER_CPU(struct nmi_ctx, nmi_contexts);
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 DEFINE_PER_CPU(unsigned long *, irq_stack_ptr);
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-EXPORT_PER_CPU_SYMBOL_GPL(irq_stack_ptr);
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-int arch_show_interrupts(struct seq_file *p, int prec)
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+
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+DECLARE_PER_CPU(unsigned long *, irq_shadow_call_stack_ptr);
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+
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+#ifdef CONFIG_SHADOW_CALL_STACK
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+DEFINE_PER_CPU(unsigned long *, irq_shadow_call_stack_ptr);
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+#endif
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+
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+static void init_irq_scs(void)
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 {
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-	show_ipi_list(p, prec);
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-	seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count);
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-	return 0;
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+	int cpu;
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+
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+	if (!IS_ENABLED(CONFIG_SHADOW_CALL_STACK))
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+		return;
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+
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+	for_each_possible_cpu(cpu)
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+		per_cpu(irq_shadow_call_stack_ptr, cpu) =
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+			scs_alloc(cpu_to_node(cpu));
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 }
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 #ifdef CONFIG_VMAP_STACK
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 void __init init_IRQ(void)
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 {
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 	init_irq_stacks();
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-	scs_init_irq();
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+	init_irq_scs();
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 	irqchip_init();
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 	if (!handle_arch_irq)
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 		panic("No interrupt controller found.");
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+
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+	if (system_uses_irq_prio_masking()) {
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+		/*
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+		 * Now that we have a stack for our IRQ handler, set
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+		 * the PMR/PSR pair to a consistent state.
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+		 */
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+		WARN_ON(read_sysreg(daif) & PSR_A_BIT);
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+		local_daif_restore(DAIF_PROCCTX_NOIRQ);
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+	}
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 }