[PATCH -next v5 01/22] arm64: ptrace: Replace interrupts_enabled() with regs_irqs_disabled()

[Jinjie Ruan <ruanjinjie@huawei.com>]

The generic entry code expects architecture code to provide
regs_irqs_disabled(regs) function, but arm64 does not have this and
provides inerrupts_enabled(regs), which has the opposite polarity.

In preparation for moving arm64 over to the generic entry code,
relace arm64's interrupts_enabled() with regs_irqs_disabled() and
update its callers under arch/arm64.

For the moment, a definition of interrupts_enabled() is provided for
the GICv3 driver. Once arch/arm implement regs_irqs_disabled(), this
can be removed.

No functional changes.

Suggested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
---
 arch/arm64/include/asm/daifflags.h  | 2 +-
 arch/arm64/include/asm/ptrace.h     | 7 +++++++
 arch/arm64/include/asm/xen/events.h | 2 +-
 arch/arm64/kernel/acpi.c            | 2 +-
 arch/arm64/kernel/debug-monitors.c  | 2 +-
 arch/arm64/kernel/entry-common.c    | 4 ++--
 arch/arm64/kernel/sdei.c            | 2 +-
 7 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/include/asm/daifflags.h b/arch/arm64/include/asm/daifflags.h
index fbb5c99eb2f9..5fca48009043 100644
--- a/arch/arm64/include/asm/daifflags.h
+++ b/arch/arm64/include/asm/daifflags.h
@@ -128,7 +128,7 @@ static inline void local_daif_inherit(struct pt_regs *regs)
 {
 	unsigned long flags = regs->pstate & DAIF_MASK;
 
-	if (interrupts_enabled(regs))
+	if (!regs_irqs_disabled(regs))
 		trace_hardirqs_on();
 
 	if (system_uses_irq_prio_masking())
diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h
index 47ff8654c5ec..bcfa96880377 100644
--- a/arch/arm64/include/asm/ptrace.h
+++ b/arch/arm64/include/asm/ptrace.h
@@ -214,9 +214,16 @@ static inline void forget_syscall(struct pt_regs *regs)
 		(regs)->pmr == GIC_PRIO_IRQON :				\
 		true)
 
+/*
+ * Used by the GICv3 driver, can be removed once arch/arm implements
+ * regs_irqs_disabled() directly.
+ */
 #define interrupts_enabled(regs)			\
 	(!((regs)->pstate & PSR_I_BIT) && irqs_priority_unmasked(regs))
 
+#define regs_irqs_disabled(regs)			\
+	(((regs)->pstate & PSR_I_BIT) || (!irqs_priority_unmasked(regs)))
+
 #define fast_interrupts_enabled(regs) \
 	(!((regs)->pstate & PSR_F_BIT))
 
diff --git a/arch/arm64/include/asm/xen/events.h b/arch/arm64/include/asm/xen/events.h
index 2788e95d0ff0..2977b5fe068d 100644
--- a/arch/arm64/include/asm/xen/events.h
+++ b/arch/arm64/include/asm/xen/events.h
@@ -14,7 +14,7 @@ enum ipi_vector {
 
 static inline int xen_irqs_disabled(struct pt_regs *regs)
 {
-	return !interrupts_enabled(regs);
+	return regs_irqs_disabled(regs);
 }
 
 #define xchg_xen_ulong(ptr, val) xchg((ptr), (val))
diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
index e6f66491fbe9..732f89daae23 100644
--- a/arch/arm64/kernel/acpi.c
+++ b/arch/arm64/kernel/acpi.c
@@ -403,7 +403,7 @@ int apei_claim_sea(struct pt_regs *regs)
 	return_to_irqs_enabled = !irqs_disabled_flags(arch_local_save_flags());
 
 	if (regs)
-		return_to_irqs_enabled = interrupts_enabled(regs);
+		return_to_irqs_enabled = !regs_irqs_disabled(regs);
 
 	/*
 	 * SEA can interrupt SError, mask it and describe this as an NMI so
diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c
index 58f047de3e1c..460c09d03a73 100644
--- a/arch/arm64/kernel/debug-monitors.c
+++ b/arch/arm64/kernel/debug-monitors.c
@@ -231,7 +231,7 @@ static void send_user_sigtrap(int si_code)
 	if (WARN_ON(!user_mode(regs)))
 		return;
 
-	if (interrupts_enabled(regs))
+	if (!regs_irqs_disabled(regs))
 		local_irq_enable();
 
 	arm64_force_sig_fault(SIGTRAP, si_code, instruction_pointer(regs),
diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c
index b260ddc4d3e9..c547e70428d3 100644
--- a/arch/arm64/kernel/entry-common.c
+++ b/arch/arm64/kernel/entry-common.c
@@ -73,7 +73,7 @@ static __always_inline void __exit_to_kernel_mode(struct pt_regs *regs)
 {
 	lockdep_assert_irqs_disabled();
 
-	if (interrupts_enabled(regs)) {
+	if (!regs_irqs_disabled(regs)) {
 		if (regs->exit_rcu) {
 			trace_hardirqs_on_prepare();
 			lockdep_hardirqs_on_prepare();
@@ -569,7 +569,7 @@ static void noinstr el1_interrupt(struct pt_regs *regs,
 {
 	write_sysreg(DAIF_PROCCTX_NOIRQ, daif);
 
-	if (IS_ENABLED(CONFIG_ARM64_PSEUDO_NMI) && !interrupts_enabled(regs))
+	if (IS_ENABLED(CONFIG_ARM64_PSEUDO_NMI) && regs_irqs_disabled(regs))
 		__el1_pnmi(regs, handler);
 	else
 		__el1_irq(regs, handler);
diff --git a/arch/arm64/kernel/sdei.c b/arch/arm64/kernel/sdei.c
index 255d12f881c2..27a17da635d8 100644
--- a/arch/arm64/kernel/sdei.c
+++ b/arch/arm64/kernel/sdei.c
@@ -247,7 +247,7 @@ unsigned long __kprobes do_sdei_event(struct pt_regs *regs,
 	 * If we interrupted the kernel with interrupts masked, we always go
 	 * back to wherever we came from.
 	 */
-	if (mode == kernel_mode && !interrupts_enabled(regs))
+	if (mode == kernel_mode && regs_irqs_disabled(regs))
 		return SDEI_EV_HANDLED;
 
 	/*
-- 
2.34.1