linux-kernel - [PATCH v2] irqchip/irq-brcmstb-l2: add write memory barrier before exit

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Message-Id: <20240210012449.3009125-1-florian.fainelli@broadcom.com>
Date: Fri,  9 Feb 2024 17:24:49 -0800
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: linux-kernel@...r.kernel.org
Cc: maz@...nel.org,
	Doug Berger <opendmb@...il.com>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Brian Norris <computersforpeace@...il.com>,
	Jason Cooper <jason@...edaemon.net>,
	linux-mips@...r.kernel.org (open list:BROADCOM BMIPS MIPS ARCHITECTURE),
	linux-arm-kernel@...ts.infradead.org (moderated list:BROADCOM BCM7XXX ARM ARCHITECTURE)
Subject: [PATCH v2] irqchip/irq-brcmstb-l2: add write memory barrier before exit

From: Doug Berger <opendmb@...il.com>

It was observed on Broadcom devices that use GIC v3 architecture
L1 interrupt controllers as the parent of brcmstb-l2 interrupt
controllers that the deactivation of the parent irq could happen
before the brcmstb-l2 deasserted its output. This would lead the
GIC to reactivate the irq only to find that no L2 interrupt was
pending. The result was a spurious interrupt invoking the
handle_bad_irq() with its associated messaging. While this did
not create a functional problem it is a waste of cycles.

The hazard exists because the memory mapped bus writes to the
brcmstb-l2 registers are buffered and the GIC v3 architecture
uses a very efficient system register write to deactivate the
interrupt. This commit adds a write memory barrier prior to
invoking chained_irq_exit() to introduce a dsb(st) on those
systems to ensure the system register write cannot be executed
until the memory mapped writes are visible to the system.

Signed-off-by: Doug Berger <opendmb@...il.com>
Acked-by: Florian Fainelli <florian.fainelli@...adcom.com>
Fixes: 7f646e92766e ("irqchip: brcmstb-l2: Add Broadcom Set Top Box  Level-2 interrupt controller")
[florian: Added Fixes tag]
Signed-off-by: Florian Fainelli <florian.fainelli@...adcom.com>
---
Changes in v2:

- add Fixes tag
- bump copyright

 drivers/irqchip/irq-brcmstb-l2.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-brcmstb-l2.c b/drivers/irqchip/irq-brcmstb-l2.c
index 5559c943f03f..63aed60dd3f1 100644
--- a/drivers/irqchip/irq-brcmstb-l2.c
+++ b/drivers/irqchip/irq-brcmstb-l2.c
@@ -2,7 +2,7 @@
 /*
  * Generic Broadcom Set Top Box Level 2 Interrupt controller driver
  *
- * Copyright (C) 2014-2017 Broadcom
+ * Copyright (C) 2014-2024 Broadcom
  */

 #define pr_fmt(fmt)	KBUILD_MODNAME	": " fmt
@@ -112,6 +112,9 @@ static void brcmstb_l2_intc_irq_handle(struct irq_desc *desc)
 		generic_handle_domain_irq(b->domain, irq);
 	} while (status);
 out:
+	/* Don't ack parent before all device writes are done */
+	wmb();
+
 	chained_irq_exit(chip, desc);
 }

-- 
2.34.1