diff options
Diffstat (limited to 'arch/arm64/include/asm/hardirq.h')
| -rw-r--r-- | arch/arm64/include/asm/hardirq.h | 105 |
1 files changed, 71 insertions, 34 deletions
diff --git a/arch/arm64/include/asm/hardirq.h b/arch/arm64/include/asm/hardirq.h index 990c051e7829..77d6b8c63d4e 100644 --- a/arch/arm64/include/asm/hardirq.h +++ b/arch/arm64/include/asm/hardirq.h @@ -1,45 +1,89 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2012 ARM Ltd. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #ifndef __ASM_HARDIRQ_H #define __ASM_HARDIRQ_H #include <linux/cache.h> +#include <linux/percpu.h> #include <linux/threads.h> +#include <asm/barrier.h> #include <asm/irq.h> +#include <asm/kvm_arm.h> +#include <asm/sysreg.h> -#define NR_IPI 4 +#define ack_bad_irq ack_bad_irq +#include <asm-generic/hardirq.h> -typedef struct { - unsigned int __softirq_pending; -#ifdef CONFIG_SMP - unsigned int ipi_irqs[NR_IPI]; -#endif -} ____cacheline_aligned irq_cpustat_t; +#define __ARCH_IRQ_EXIT_IRQS_DISABLED 1 -#include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */ +struct nmi_ctx { + u64 hcr; + unsigned int cnt; +}; -#define __inc_irq_stat(cpu, member) __IRQ_STAT(cpu, member)++ -#define __get_irq_stat(cpu, member) __IRQ_STAT(cpu, member) +DECLARE_PER_CPU(struct nmi_ctx, nmi_contexts); -#ifdef CONFIG_SMP -u64 smp_irq_stat_cpu(unsigned int cpu); -#define arch_irq_stat_cpu smp_irq_stat_cpu -#endif +#define arch_nmi_enter() \ +do { \ + struct nmi_ctx *___ctx; \ + u64 ___hcr; \ + \ + if (!is_kernel_in_hyp_mode()) \ + break; \ + \ + ___ctx = this_cpu_ptr(&nmi_contexts); \ + if (___ctx->cnt) { \ + ___ctx->cnt++; \ + break; \ + } \ + \ + ___hcr = read_sysreg(hcr_el2); \ + if (!(___hcr & HCR_TGE)) { \ + write_sysreg_hcr(___hcr | HCR_TGE); \ + isb(); \ + } \ + /* \ + * Make sure the sysreg write is performed before ___ctx->cnt \ + * is set to 1. NMIs that see cnt == 1 will rely on us. \ + */ \ + barrier(); \ + ___ctx->cnt = 1; \ + /* \ + * Make sure ___ctx->cnt is set before we save ___hcr. We \ + * don't want ___ctx->hcr to be overwritten. \ + */ \ + barrier(); \ + ___ctx->hcr = ___hcr; \ +} while (0) -#define __ARCH_IRQ_EXIT_IRQS_DISABLED 1 +#define arch_nmi_exit() \ +do { \ + struct nmi_ctx *___ctx; \ + u64 ___hcr; \ + \ + if (!is_kernel_in_hyp_mode()) \ + break; \ + \ + ___ctx = this_cpu_ptr(&nmi_contexts); \ + ___hcr = ___ctx->hcr; \ + /* \ + * Make sure we read ___ctx->hcr before we release \ + * ___ctx->cnt as it makes ___ctx->hcr updatable again. \ + */ \ + barrier(); \ + ___ctx->cnt--; \ + /* \ + * Make sure ___ctx->cnt release is visible before we \ + * restore the sysreg. Otherwise a new NMI occurring \ + * right after write_sysreg() can be fooled and think \ + * we secured things for it. \ + */ \ + barrier(); \ + if (!___ctx->cnt && !(___hcr & HCR_TGE)) \ + write_sysreg_hcr(___hcr); \ +} while (0) static inline void ack_bad_irq(unsigned int irq) { @@ -47,11 +91,4 @@ static inline void ack_bad_irq(unsigned int irq) irq_err_count++; } -extern void handle_IRQ(unsigned int, struct pt_regs *); - -/* - * No arch-specific IRQ flags. - */ -#define set_irq_flags(irq, flags) - #endif /* __ASM_HARDIRQ_H */ |