From: Valentin Schneider <valentin.schneider@arm.com>
To: linux-kernel@vger.kernel.org
Cc: Guenter Roeck <linux@roeck-us.net>, Marc Zyngier <maz@kernel.org>,
tglx@linutronix.de
Subject: Re: [irqchip: irq/irqchip-next] irqchip/bcm2836: Fix IPI acknowledgement after conversion to handle_percpu_devid_irq
Date: Fri, 18 Dec 2020 20:36:37 +0000 [thread overview]
Message-ID: <jhjo8iqsvgk.mognet@arm.com> (raw)
In-Reply-To: <160831684292.22759.15563002516530918910.tip-bot2@tip-bot2>
On 18/12/20 18:40, irqchip-bot for Marc Zyngier wrote:
> The following commit has been merged into the irq/irqchip-next branch of irqchip:
>
> Commit-ID: d7f39c40ebb6986e7371510d1c20a4efee4a7f0d
> Gitweb: https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/d7f39c40ebb6986e7371510d1c20a4efee4a7f0d
> Author: Marc Zyngier <maz@kernel.org>
> AuthorDate: Fri, 18 Dec 2020 18:03:46
> Committer: Marc Zyngier <maz@kernel.org>
> CommitterDate: Fri, 18 Dec 2020 18:34:17
>
> irqchip/bcm2836: Fix IPI acknowledgement after conversion to handle_percpu_devid_irq
>
> It appears that despite its name, the bcm2836_arm_irqchip_ipi_eoi()
> callback is an acknowledgement, and not an EOI. This means that
> we lose IPIs that are made pending between the handling of the
> IPI and the write to LOCAL_MAILBOX0_CLR0. With the right timing,
> things fail nicely.
>
> This used to work with handle_percpu_devid_fasteoi_ipi(), which
> started by eoi-ing the interrupt. With the standard fasteoi flow,
> this doesn't work anymore.
>
> So let's use this callback for what it is, an ack. Your favourite
> RPi-2/3 is back up and running.
>
Thanks for cleaning up my mess!
> Fixes: ffdad793d579 ("irqchip/bcm2836: Make IPIs use handle_percpu_devid_irq()")
> Cc: Valentin Schneider <valentin.schneider@arm.com>
> Reported-by: Guenter Roeck <linux@roeck-us.net>
> Tested-by: Guenter Roeck <linux@roeck-us.net>
> Signed-off-by: Marc Zyngier <maz@kernel.org>
> Link: https://lore.kernel.org/r/c9fb4ab3-a5cb-648c-6de3-c6a871e60870@roeck-us.net
next prev parent reply other threads:[~2020-12-18 20:37 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-09 9:41 [PATCH 0/5] genirq: Get rid of handle_percpu_devid_fasteoi_ipi() Valentin Schneider
2020-11-09 9:41 ` [PATCH 1/5] irqchip/gic, gic-v3: Make SGIs use handle_percpu_devid_irq() Valentin Schneider
2020-12-11 14:58 ` [irqchip: irq/irqchip-next] " irqchip-bot for Valentin Schneider
2020-11-09 9:41 ` [PATCH 2/5] irqchip/armada-370-xp: Make IPIs " Valentin Schneider
2020-12-11 14:58 ` [irqchip: irq/irqchip-next] " irqchip-bot for Valentin Schneider
2020-11-09 9:41 ` [PATCH 3/5] irqchip/bcm2836: " Valentin Schneider
2020-12-11 14:58 ` [irqchip: irq/irqchip-next] " irqchip-bot for Valentin Schneider
2020-12-15 0:21 ` [PATCH 3/5] " Guenter Roeck
2020-12-15 10:19 ` Marc Zyngier
2020-12-15 11:14 ` Valentin Schneider
2020-12-15 12:14 ` Marc Zyngier
2020-12-15 15:21 ` Guenter Roeck
2020-12-15 15:26 ` Marc Zyngier
2020-12-15 15:39 ` Guenter Roeck
2020-12-15 15:46 ` Marc Zyngier
2020-12-15 16:23 ` Guenter Roeck
2020-12-18 5:18 ` Guenter Roeck
2020-12-18 18:40 ` Marc Zyngier
2020-12-18 18:47 ` Guenter Roeck
2020-12-18 18:40 ` [irqchip: irq/irqchip-next] irqchip/bcm2836: Fix IPI acknowledgement after conversion to handle_percpu_devid_irq irqchip-bot for Marc Zyngier
2020-12-18 20:36 ` Valentin Schneider [this message]
2020-12-18 20:53 ` Marc Zyngier
2020-11-09 9:41 ` [PATCH 4/5] irqchip/hip04: Make IPIs use handle_percpu_devid_irq() Valentin Schneider
2020-12-11 14:58 ` [irqchip: irq/irqchip-next] " irqchip-bot for Valentin Schneider
2020-11-09 9:41 ` [PATCH 5/5] Revert "genirq: Add fasteoi IPI flow" Valentin Schneider
2020-12-11 14:58 ` [irqchip: irq/irqchip-next] " irqchip-bot for Valentin Schneider
2020-12-11 15:01 ` [PATCH 0/5] genirq: Get rid of handle_percpu_devid_fasteoi_ipi() Marc Zyngier
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