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From: Ard Biesheuvel <ardb@kernel.org>
To: linux-arm-kernel@lists.infradead.org, linux@armlinux.org.uk
Cc: Ard Biesheuvel <ardb@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
	Kees Cook <keescook@chromium.org>,
	Keith Packard <keithpac@amazon.com>,
	Linus Walleij <linus.walleij@linaro.org>
Subject: [PATCH v2 9/9] ARM: run softirqs on the per-CPU IRQ stack
Date: Tue,  5 Oct 2021 09:15:42 +0200	[thread overview]
Message-ID: <20211005071542.3127341-10-ardb@kernel.org> (raw)
In-Reply-To: <20211005071542.3127341-1-ardb@kernel.org>

Now that we have enabled IRQ stacks, any softIRQs that are handled over
the back of a hard IRQ will run from the IRQ stack as well. However, any
synchronous softirq processing that happens when re-enabling softIRQs
from task context will still execute on that task's stack.

So let's wire up the existing infrastructure to run these softIRQs from
the IRQ stack as well.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/arm/Kconfig      | 2 ++
 arch/arm/kernel/irq.c | 9 +++++++++
 2 files changed, 11 insertions(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a8c1db0736f3..d46b243e1b26 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1166,6 +1166,8 @@ config CURRENT_POINTER_IN_TPIDRURO
 config IRQSTACKS
 	def_bool y
 	depends on GENERIC_IRQ_MULTI_HANDLER && THREAD_INFO_IN_TASK
+	select HAVE_IRQ_EXIT_ON_IRQ_STACK
+	select HAVE_SOFTIRQ_ON_OWN_STACK
 
 config ARM_CPU_TOPOLOGY
 	bool "Support cpu topology definition"
diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 58af2adb1583..de25e4bfd00c 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -36,11 +36,14 @@
 #include <asm/hardware/cache-l2x0.h>
 #include <asm/hardware/cache-uniphier.h>
 #include <asm/outercache.h>
+#include <asm/softirq_stack.h>
 #include <asm/exception.h>
 #include <asm/mach/arch.h>
 #include <asm/mach/irq.h>
 #include <asm/mach/time.h>
 
+#include "reboot.h"
+
 unsigned long irq_err_count;
 
 #ifdef CONFIG_IRQSTACKS
@@ -60,6 +63,12 @@ static void __init init_irq_stacks(void)
 	}
 }
 
+void do_softirq_own_stack(void)
+{
+	call_with_stack((void *)__do_softirq, NULL,
+			__this_cpu_read(irq_stack_ptr));
+}
+
 #endif
 
 int arch_show_interrupts(struct seq_file *p, int prec)
-- 
2.30.2


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  parent reply	other threads:[~2021-10-05  7:21 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-05  7:15 [PATCH v2 0/9] ARM: add support for IRQ stacks Ard Biesheuvel
2021-10-05  7:15 ` [PATCH v2 1/9] ARM: remove some dead code Ard Biesheuvel
2021-10-05 12:06   ` Arnd Bergmann
2021-10-05  7:15 ` [PATCH v2 2/9] ARM: assembler: introduce bl_r and bl_m macros Ard Biesheuvel
2021-10-05 12:10   ` Arnd Bergmann
2021-10-05 12:14     ` Ard Biesheuvel
2021-10-05  7:15 ` [PATCH v2 3/9] ARM: optimize indirect call to handle_arch_irq for v7 cores Ard Biesheuvel
2021-10-05 12:11   ` Arnd Bergmann
2021-10-05  7:15 ` [PATCH v2 4/9] ARM: unwind: support unwinding across multiple stacks Ard Biesheuvel
2021-10-05 12:17   ` Arnd Bergmann
2021-10-05  7:15 ` [PATCH v2 5/9] ARM: export dump_mem() to other objects Ard Biesheuvel
2021-10-05 12:15   ` Arnd Bergmann
2021-10-05  7:15 ` [PATCH v2 6/9] ARM: unwind: dump exception stack from calling frame Ard Biesheuvel
2021-10-05 12:20   ` Arnd Bergmann
2021-10-05  7:15 ` [PATCH v2 7/9] ARM: implement IRQ stacks Ard Biesheuvel
2021-10-05 12:26   ` Arnd Bergmann
2021-10-05  7:15 ` [PATCH v2 8/9] ARM: call_with_stack: add unwind support Ard Biesheuvel
2021-10-05 12:22   ` Arnd Bergmann
2021-10-05 18:46     ` Nick Desaulniers
2021-10-05 18:57       ` Ard Biesheuvel
2021-10-05  7:15 ` Ard Biesheuvel [this message]
2021-10-05 12:23   ` [PATCH v2 9/9] ARM: run softirqs on the per-CPU IRQ stack Arnd Bergmann
2021-10-06 15:21     ` Ard Biesheuvel
2021-10-11 23:29 ` [PATCH v2 0/9] ARM: add support for IRQ stacks Keith Packard
2021-10-16 22:04 ` Linus Walleij

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