This is a note to let you know that I've just added the patch titled
irqchip/irq-brcmstb-l2: Add write memory barrier before exit
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
irqchip-irq-brcmstb-l2-add-write-memory-barrier-before-exit.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b0344d6854d25a8b3b901c778b1728885dd99007 Mon Sep 17 00:00:00 2001
From: Doug Berger <opendmb@xxxxxxxxx>
Date: Fri, 9 Feb 2024 17:24:49 -0800
Subject: irqchip/irq-brcmstb-l2: Add write memory barrier before exit
From: Doug Berger <opendmb@xxxxxxxxx>
commit b0344d6854d25a8b3b901c778b1728885dd99007 upstream.
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 interrupt could happen before the
brcmstb-l2 deasserted its output. This would lead the GIC to reactivate the
interrupt only to find that no L2 interrupt was pending. The result was a
spurious interrupt invoking 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.
Add 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.
[ florian: Added Fixes tag ]
Fixes: 7f646e92766e ("irqchip: brcmstb-l2: Add Broadcom Set Top Box Level-2 interrupt controller")
Signed-off-by: Doug Berger <opendmb@xxxxxxxxx>
Signed-off-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Acked-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
Acked-by: Marc Zyngier <maz@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20240210012449.3009125-1-florian.fainelli@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/irqchip/irq-brcmstb-l2.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- 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
@@ -113,6 +113,9 @@ static void brcmstb_l2_intc_irq_handle(s
generic_handle_irq(irq_linear_revmap(b->domain, irq));
} while (status);
out:
+ /* Don't ack parent before all device writes are done */
+ wmb();
+
chained_irq_exit(chip, desc);
}
Patches currently in stable-queue which might be from opendmb@xxxxxxxxx are
queue-5.4/irqchip-irq-brcmstb-l2-add-write-memory-barrier-before-exit.patch
