linux-kernel - [irqchip: irq/irqchip-next] RISC-V: Clear SIP bit only when using SBI IPI operations

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Date:   Sat, 08 Apr 2023 10:45:19 -0000
From:   "irqchip-bot for Anup Patel" <tip-bot2@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     Anup Patel <apatel@...tanamicro.com>,
        Bin Meng <bmeng.cn@...il.com>,
        Atish Patra <atishp@...osinc.com>,
        Palmer Dabbelt <palmer@...osinc.com>,
        Marc Zyngier <maz@...nel.org>, tglx@...utronix.de
Subject: [irqchip: irq/irqchip-next] RISC-V: Clear SIP bit only when using SBI
 IPI operations

The following commit has been merged into the irq/irqchip-next branch of irqchip:

Commit-ID:     3ee92565b83ecc08e5b0c878dd87a2973eaca2ea
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/3ee92565b83ecc08e5b0c878dd87a2973eaca2ea
Author:        Anup Patel <apatel@...tanamicro.com>
AuthorDate:    Tue, 28 Mar 2023 09:22:17 +05:30
Committer:     Marc Zyngier <maz@...nel.org>
CommitterDate: Sat, 08 Apr 2023 11:26:23 +01:00

RISC-V: Clear SIP bit only when using SBI IPI operations

The software interrupt pending (i.e. [M|S]SIP) bit is writeable for
S-mode but read-only for M-mode so we clear this bit only when using
SBI IPI operations.

Signed-off-by: Anup Patel <apatel@...tanamicro.com>
Reviewed-by: Bin Meng <bmeng.cn@...il.com>
Reviewed-by: Atish Patra <atishp@...osinc.com>
Acked-by: Palmer Dabbelt <palmer@...osinc.com>
Signed-off-by: Marc Zyngier <maz@...nel.org>
Link: https://lore.kernel.org/r/20230328035223.1480939-2-apatel@ventanamicro.com
---
 arch/riscv/kernel/sbi.c | 8 +++++++-
 arch/riscv/kernel/smp.c | 2 --
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c
index 5c87db8..ac99a70 100644
--- a/arch/riscv/kernel/sbi.c
+++ b/arch/riscv/kernel/sbi.c
@@ -646,8 +646,14 @@ static void sbi_send_cpumask_ipi(const struct cpumask *target)
 	sbi_send_ipi(target);
 }
 
+static void sbi_ipi_clear(void)
+{
+	csr_clear(CSR_IP, IE_SIE);
+}
+
 static const struct riscv_ipi_ops sbi_ipi_ops = {
-	.ipi_inject = sbi_send_cpumask_ipi
+	.ipi_inject = sbi_send_cpumask_ipi,
+	.ipi_clear = sbi_ipi_clear
 };
 
 void __init sbi_init(void)
diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c
index 8c3b59f..8a12768 100644
--- a/arch/riscv/kernel/smp.c
+++ b/arch/riscv/kernel/smp.c
@@ -112,8 +112,6 @@ void riscv_clear_ipi(void)
 {
 	if (ipi_ops && ipi_ops->ipi_clear)
 		ipi_ops->ipi_clear();
-
-	csr_clear(CSR_IP, IE_SIE);
 }
 EXPORT_SYMBOL_GPL(riscv_clear_ipi);