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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...
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