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Message-ID: <20241206101744.4161990-2-ruanjinjie@huawei.com>
Date: Fri, 6 Dec 2024 18:17:23 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: <catalin.marinas@....com>, <will@...nel.org>, <oleg@...hat.com>,
<sstabellini@...nel.org>, <tglx@...utronix.de>, <peterz@...radead.org>,
<luto@...nel.org>, <mingo@...hat.com>, <juri.lelli@...hat.com>,
<vincent.guittot@...aro.org>, <dietmar.eggemann@....com>,
<rostedt@...dmis.org>, <bsegall@...gle.com>, <mgorman@...e.de>,
<vschneid@...hat.com>, <kees@...nel.org>, <wad@...omium.org>,
<akpm@...ux-foundation.org>, <samitolvanen@...gle.com>,
<masahiroy@...nel.org>, <hca@...ux.ibm.com>, <aliceryhl@...gle.com>,
<rppt@...nel.org>, <xur@...gle.com>, <paulmck@...nel.org>, <arnd@...db.de>,
<mbenes@...e.cz>, <puranjay@...nel.org>, <mark.rutland@....com>,
<ruanjinjie@...wei.com>, <pcc@...gle.com>, <ardb@...nel.org>,
<sudeep.holla@....com>, <guohanjun@...wei.com>, <rafael@...nel.org>,
<liuwei09@...tc.cn>, <dwmw@...zon.co.uk>, <Jonathan.Cameron@...wei.com>,
<liaochang1@...wei.com>, <kristina.martsenko@....com>, <ptosi@...gle.com>,
<broonie@...nel.org>, <thiago.bauermann@...aro.org>, <kevin.brodsky@....com>,
<joey.gouly@....com>, <liuyuntao12@...wei.com>, <leobras@...hat.com>,
<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
<xen-devel@...ts.xenproject.org>
Subject: [PATCH -next v5 01/22] arm64: ptrace: Replace interrupts_enabled() with regs_irqs_disabled()
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@....com>
Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.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
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