From: guoren@kernel.org
To: arnd@arndb.de, guoren@kernel.org, palmer@rivosinc.com,
tglx@linutronix.de, peterz@infradead.org, luto@kernel.org,
conor.dooley@microchip.com, heiko@sntech.de, jszhang@kernel.org,
lazyparser@gmail.com, falcon@tinylab.org, chenhuacai@kernel.org,
apatel@ventanamicro.com, atishp@atishpatra.org,
palmer@dabbelt.com, paul.walmsley@sifive.com,
bigeasy@linutronix.de
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-riscv@lists.infradead.org,
Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH V3 6/7] riscv: Support HAVE_SOFTIRQ_ON_OWN_STACK
Date: Mon, 5 Sep 2022 23:54:22 -0400 [thread overview]
Message-ID: <20220906035423.634617-7-guoren@kernel.org> (raw)
In-Reply-To: <20220906035423.634617-1-guoren@kernel.org>
From: Guo Ren <guoren@linux.alibaba.com>
Add the HAVE_SOFTIRQ_ON_OWN_STACK feature for the IRQ_STACKS config. The
irq and softirq use the same independent irq_stack of percpu by time
division multiplexing.
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
---
arch/riscv/Kconfig | 7 ++++---
arch/riscv/kernel/irq.c | 16 ++++++++++++++++
2 files changed, 20 insertions(+), 3 deletions(-)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index a8a12b4ba1a9..da548ed7d107 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -434,12 +434,13 @@ config FPU
If you don't know what to do here, say Y.
config IRQ_STACKS
- bool "Independent irq stacks"
+ bool "Independent irq & softirq stacks"
default y
select HAVE_IRQ_EXIT_ON_IRQ_STACK
+ select HAVE_SOFTIRQ_ON_OWN_STACK
help
- Add independent irq stacks for percpu to prevent kernel stack overflows.
- We may save some memory footprint by disabling IRQ_STACKS.
+ Add independent irq & softirq stacks for percpu to prevent kernel stack
+ overflows. We may save some memory footprint by disabling IRQ_STACKS.
endmenu # "Platform type"
diff --git a/arch/riscv/kernel/irq.c b/arch/riscv/kernel/irq.c
index 5ad4952203c5..c09cd4d28308 100644
--- a/arch/riscv/kernel/irq.c
+++ b/arch/riscv/kernel/irq.c
@@ -11,6 +11,7 @@
#include <linux/seq_file.h>
#include <asm/smp.h>
#include <asm/vmap_stack.h>
+#include <asm/softirq_stack.h>
#ifdef CONFIG_IRQ_STACKS
static DEFINE_PER_CPU(ulong *, irq_stack_ptr);
@@ -38,6 +39,21 @@ static void init_irq_stacks(void)
per_cpu(irq_stack_ptr, cpu) = per_cpu(irq_stack, cpu);
}
#endif /* CONFIG_VMAP_STACK */
+
+#ifndef CONFIG_PREEMPT_RT
+static void do_riscv_softirq(struct pt_regs *regs)
+{
+ __do_softirq();
+}
+
+void do_softirq_own_stack(void)
+{
+ ulong *sp = per_cpu(irq_stack_ptr, smp_processor_id());
+
+ call_on_stack(NULL, sp, do_riscv_softirq, 0);
+}
+#endif /* CONFIG_PREEMPT_RT */
+
#else
static void init_irq_stacks(void) {}
#endif /* CONFIG_IRQ_STACKS */
--
2.36.1
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next prev parent reply other threads:[~2022-09-06 3:55 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-06 3:54 [PATCH V3 0/7] riscv: Add GENERIC_ENTRY, irq stack support guoren
2022-09-06 3:54 ` [PATCH V3 1/7] riscv: elf_kexec: Fixup compile warning guoren
2022-09-06 3:54 ` [PATCH V3 2/7] riscv: compat_syscall_table: " guoren
2022-09-06 3:54 ` [PATCH V3 3/7] riscv: ptrace: Remove duplicate operation guoren
2022-09-06 3:54 ` [PATCH V3 4/7] riscv: convert to generic entry guoren
2022-09-06 9:20 ` Peter Zijlstra
2022-09-07 0:59 ` Guo Ren
2022-09-06 3:54 ` [PATCH V3 5/7] riscv: Support HAVE_IRQ_EXIT_ON_IRQ_STACK guoren
2022-09-06 3:54 ` guoren [this message]
2022-09-06 3:54 ` [PATCH V3 7/7] riscv: Add config of thread stack size guoren
2022-09-06 17:42 ` [PATCH V3 0/7] riscv: Add GENERIC_ENTRY, irq stack support Conor.Dooley
2022-09-07 0:54 ` Guo Ren
2022-09-07 2:52 ` Guo Ren
2022-09-07 6:23 ` Conor.Dooley
2022-09-07 7:06 ` Guo Ren
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