linux-kernel - [PATCH AUTOSEL 6.1 11/19] irqchip/riscv-intc: Mark all INTC nodes as initialized

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Message-Id: <20231018141323.1334898-11-sashal@kernel.org>
Date:   Wed, 18 Oct 2023 10:13:13 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Anup Patel <apatel@...tanamicro.com>,
        Dmitry Dunaev <dunaev@...on.ru>, Marc Zyngier <maz@...nel.org>,
        Sasha Levin <sashal@...nel.org>, tglx@...utronix.de,
        paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, linux-riscv@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.1 11/19] irqchip/riscv-intc: Mark all INTC nodes as initialized

From: Anup Patel <apatel@...tanamicro.com>

[ Upstream commit e13cd66bd821be417c498a34928652db4ac6b436 ]

The RISC-V INTC local interrupts are per-HART (or per-CPU) so we
create INTC IRQ domain only for the INTC node belonging to the boot
HART. This means only the boot HART INTC node will be marked as
initialized and other INTC nodes won't be marked which results
downstream interrupt controllers (such as PLIC, IMSIC and APLIC
direct-mode) not being probed due to missing device suppliers.

To address this issue, we mark all INTC node for which we don't
create IRQ domain as initialized.

Reported-by: Dmitry Dunaev <dunaev@...on.ru>
Signed-off-by: Anup Patel <apatel@...tanamicro.com>
Signed-off-by: Marc Zyngier <maz@...nel.org>
Link: https://lore.kernel.org/r/20230926102801.1591126-1-dunaev@tecon.ru
Link: https://lore.kernel.org/r/20231003044403.1974628-4-apatel@ventanamicro.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/irqchip/irq-riscv-intc.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-riscv-intc.c b/drivers/irqchip/irq-riscv-intc.c
index 499e5f81b3fe3..4b66850978e6e 100644
--- a/drivers/irqchip/irq-riscv-intc.c
+++ b/drivers/irqchip/irq-riscv-intc.c
@@ -110,8 +110,16 @@ static int __init riscv_intc_init(struct device_node *node,
 	 * for each INTC DT node. We only need to do INTC initialization
 	 * for the INTC DT node belonging to boot CPU (or boot HART).
 	 */
-	if (riscv_hartid_to_cpuid(hartid) != smp_processor_id())
+	if (riscv_hartid_to_cpuid(hartid) != smp_processor_id()) {
+		/*
+		 * The INTC nodes of each CPU are suppliers for downstream
+		 * interrupt controllers (such as PLIC, IMSIC and APLIC
+		 * direct-mode) so we should mark an INTC node as initialized
+		 * if we are not creating IRQ domain for it.
+		 */
+		fwnode_dev_initialized(of_fwnode_handle(node), true);
 		return 0;
+	}
 
 	intc_domain = irq_domain_add_linear(node, BITS_PER_LONG,
 					    &riscv_intc_domain_ops, NULL);
-- 
2.40.1