linux-kernel - Re: [PATCH 3/5] irqchip/bcm2836: Make IPIs use handle_percpu_devid

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Date:   Tue, 15 Dec 2020 10:19:10 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Valentin Schneider <valentin.schneider@....com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Andrew Lunn <andrew@...n.ch>,
        Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
        Jason Cooper <jason@...edaemon.net>,
        Scott Branden <sbranden@...adcom.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH 3/5] irqchip/bcm2836: Make IPIs use
 handle_percpu_devid_irq()

Hi Gunter,

On 2020-12-15 00:21, Guenter Roeck wrote:
> On Mon, Nov 09, 2020 at 09:41:19AM +0000, Valentin Schneider wrote:
>> As done for the Arm GIC irqchips, move IPIs to 
>> handle_percpu_devid_irq() as
>> handle_percpu_devid_fasteoi_ipi() isn't actually required.
>> 
>> Signed-off-by: Valentin Schneider <valentin.schneider@....com>
> 
> This patch results in boot failures (silent stall) for the qemu
> raspi2 emulation. Unfortunately it can not be reverted because
> handle_percpu_devid_fasteoi_ipi no longer exists in next-20201214,
> so I don't know if it is the only problem.

This is odd. This works just fine for me on both the RPi2 and 3
emulation, running a full Debian userspace. Could this be caused
by the version of QEMU you are using? Here's what I have:

$ qemu-system-arm --version
QEMU emulator version 5.1.0 (Debian 1:5.1+dfsg-4+b1)

Could you try the following hack and let me know if that helps?

Thanks,

         M.

diff --git a/drivers/irqchip/irq-bcm2836.c 
b/drivers/irqchip/irq-bcm2836.c
index 5f5eb8877c41..25c9a9c06e41 100644
--- a/drivers/irqchip/irq-bcm2836.c
+++ b/drivers/irqchip/irq-bcm2836.c
@@ -167,7 +167,7 @@ static void bcm2836_arm_irqchip_handle_ipi(struct 
irq_desc *desc)
  	chained_irq_exit(chip, desc);
  }

-static void bcm2836_arm_irqchip_ipi_eoi(struct irq_data *d)
+static void bcm2836_arm_irqchip_ipi_ack(struct irq_data *d)
  {
  	int cpu = smp_processor_id();

@@ -195,7 +195,7 @@ static struct irq_chip bcm2836_arm_irqchip_ipi = {
  	.name		= "IPI",
  	.irq_mask	= bcm2836_arm_irqchip_dummy_op,
  	.irq_unmask	= bcm2836_arm_irqchip_dummy_op,
-	.irq_eoi	= bcm2836_arm_irqchip_ipi_eoi,
+	.irq_ack	= bcm2836_arm_irqchip_ipi_ack,
  	.ipi_send_mask	= bcm2836_arm_irqchip_ipi_send_mask,
  };
-- 
Jazz is not dead. It just smells funny...