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Date: Fri, 8 Jul 2022 17:49:50 +0800
From: Qi Zheng <zhengqi.arch@...edance.com>
To: arnd@...db.de, catalin.marinas@....com, will@...nel.org
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Qi Zheng <zhengqi.arch@...edance.com>
Subject: [PATCH v1 2/2] arm64: support HAVE_IRQ_EXIT_ON_IRQ_STACK
Since softirqs are handled on the per-CPU IRQ stack,
let's support HAVE_IRQ_EXIT_ON_IRQ_STACK which causes
the core code to invoke __do_softirq() directly without
going through do_softirq_own_stack().
Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
---
arch/arm64/Kconfig | 1 +
arch/arm64/include/asm/exception.h | 4 +++-
arch/arm64/kernel/entry-common.c | 30 ++++++++++++++++++++----------
arch/arm64/kernel/entry.S | 6 ++++--
arch/arm64/kernel/irq.c | 5 +++--
5 files changed, 31 insertions(+), 15 deletions(-)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index be0a9f0052ee..d2cc7daecce3 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -231,6 +231,7 @@ config ARM64
select TRACE_IRQFLAGS_SUPPORT
select TRACE_IRQFLAGS_NMI_SUPPORT
select HAVE_SOFTIRQ_ON_OWN_STACK
+ select HAVE_IRQ_EXIT_ON_IRQ_STACK
help
ARM 64-bit (AArch64) Linux support.
diff --git a/arch/arm64/include/asm/exception.h b/arch/arm64/include/asm/exception.h
index d94aecff9690..8bff0aa7ab50 100644
--- a/arch/arm64/include/asm/exception.h
+++ b/arch/arm64/include/asm/exception.h
@@ -54,7 +54,9 @@ asmlinkage void el0t_32_fiq_handler(struct pt_regs *regs);
asmlinkage void el0t_32_error_handler(struct pt_regs *regs);
asmlinkage void call_on_irq_stack(struct pt_regs *regs,
- void (*func)(struct pt_regs *));
+ void (*func)(struct pt_regs *),
+ void (*do_func)(struct pt_regs *,
+ void (*)(struct pt_regs *)));
asmlinkage void asm_exit_to_user_mode(struct pt_regs *regs);
void do_mem_abort(unsigned long far, unsigned long esr, struct pt_regs *regs);
diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c
index c75ca36b4a49..935d1ab150b5 100644
--- a/arch/arm64/kernel/entry-common.c
+++ b/arch/arm64/kernel/entry-common.c
@@ -266,14 +266,16 @@ static void __sched arm64_preempt_schedule_irq(void)
}
static void do_interrupt_handler(struct pt_regs *regs,
- void (*handler)(struct pt_regs *))
+ void (*handler)(struct pt_regs *),
+ void (*do_handler)(struct pt_regs *,
+ void (*)(struct pt_regs *)))
{
struct pt_regs *old_regs = set_irq_regs(regs);
if (on_thread_stack())
- call_on_irq_stack(regs, handler);
+ call_on_irq_stack(regs, handler, do_handler);
else
- handler(regs);
+ do_handler(regs, handler);
set_irq_regs(old_regs);
}
@@ -441,22 +443,32 @@ asmlinkage void noinstr el1h_64_sync_handler(struct pt_regs *regs)
}
}
+static void nmi_handler(struct pt_regs *regs, void (*handler)(struct pt_regs *))
+{
+ handler(regs);
+}
+
static __always_inline void __el1_pnmi(struct pt_regs *regs,
void (*handler)(struct pt_regs *))
{
arm64_enter_nmi(regs);
- do_interrupt_handler(regs, handler);
+ do_interrupt_handler(regs, handler, nmi_handler);
arm64_exit_nmi(regs);
}
+static void irq_handler(struct pt_regs *regs, void (*handler)(struct pt_regs *))
+{
+ irq_enter_rcu();
+ handler(regs);
+ irq_exit_rcu();
+}
+
static __always_inline void __el1_irq(struct pt_regs *regs,
void (*handler)(struct pt_regs *))
{
enter_from_kernel_mode(regs);
- irq_enter_rcu();
- do_interrupt_handler(regs, handler);
- irq_exit_rcu();
+ do_interrupt_handler(regs, handler, irq_handler);
arm64_preempt_schedule_irq();
@@ -699,9 +711,7 @@ static void noinstr el0_interrupt(struct pt_regs *regs,
if (regs->pc & BIT(55))
arm64_apply_bp_hardening();
- irq_enter_rcu();
- do_interrupt_handler(regs, handler);
- irq_exit_rcu();
+ do_interrupt_handler(regs, handler, irq_handler);
exit_to_user_mode(regs);
}
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 254fe31c03a0..1c351391f6bd 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -867,7 +867,9 @@ NOKPROBE(ret_from_fork)
/*
* void call_on_irq_stack(struct pt_regs *regs,
- * void (*func)(struct pt_regs *));
+ * void (*func)(struct pt_regs *)
+ * void (*do_func)(struct pt_regs *,
+ * void (*)(struct pt_regs *)));
*
* Calls func(regs) using this CPU's irq stack and shadow irq stack.
*/
@@ -886,7 +888,7 @@ SYM_FUNC_START(call_on_irq_stack)
/* Move to the new stack and call the function there */
mov sp, x16
- blr x1
+ blr x2
/*
* Restore the SP from the FP, and restore the FP and LR from the frame
diff --git a/arch/arm64/kernel/irq.c b/arch/arm64/kernel/irq.c
index c36ad20a52f3..003db605bc4f 100644
--- a/arch/arm64/kernel/irq.c
+++ b/arch/arm64/kernel/irq.c
@@ -73,14 +73,15 @@ static void init_irq_stacks(void)
#endif
#ifndef CONFIG_PREEMPT_RT
-static void ____do_softirq(struct pt_regs *regs)
+static void ____do_softirq(struct pt_regs *regs,
+ void (*handler)(struct pt_regs *))
{
__do_softirq();
}
void do_softirq_own_stack(void)
{
- call_on_irq_stack(NULL, ____do_softirq);
+ call_on_irq_stack(NULL, NULL, ____do_softirq);
}
#endif
--
2.20.1
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