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Date:   Mon, 14 Sep 2020 17:10:36 +0100
From:   Marc Zyngier <maz@kernel.org>
To:     Marek Szyprowski <m.szyprowski@samsung.com>
Cc:     linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Sumit Garg <sumit.garg@linaro.org>, kernel-team@android.com,
        Florian Fainelli <f.fainelli@gmail.com>,
        Russell King <linux@arm.linux.org.uk>,
        Jason Cooper <jason@lakedaemon.net>,
        Saravana Kannan <saravanak@google.com>,
        Andrew Lunn <andrew@lunn.ch>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Gregory Clement <gregory.clement@bootlin.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Will Deacon <will@kernel.org>,
        Valentin Schneider <Valentin.Schneider@arm.com>,
        linux-rpi-kernel <linux-rpi-kernel@lists.infradead.org>
Subject: Re: [PATCH v3 10/16] irqchip/bcm2836: Configure mailbox interrupts as
 standard interrupts
In-Reply-To: <3e52be78-1725-a3a2-c97c-625d46017a4b@samsung.com>
References: <20200901144324.1071694-1-maz@kernel.org>
 <20200901144324.1071694-11-maz@kernel.org>
 <CGME20200914143236eucas1p17e8849c67d01db2c5ebb3b6a126aebf4@eucas1p1.samsung.com>
 <3e52be78-1725-a3a2-c97c-625d46017a4b@samsung.com>
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Hi Marek,

On 2020-09-14 15:32, Marek Szyprowski wrote:
> Hi Marc,
> 
> On 01.09.2020 16:43, Marc Zyngier wrote:
>> In order to switch the bcm2836 driver to privide standard interrupts
>> for IPIs, it first needs to stop lying about the way things work.
>> 
>> The mailbox interrupt is actually a multiplexer, with enough
>> bits to store 32 pending interrupts per CPU. So let's turn it
>> into a chained irqchip.
>> 
>> Once this is done, we can instanciate the corresponding IPIs,
>> and pass them to the architecture code.
>> 
>> Signed-off-by: Marc Zyngier <maz@kernel.org>
> 
> This one also fails. It breaks booting of Raspberry Pi 3b boards (both
> in ARM and ARM64 mode):

Damn. This used to work. Looks like I was eager to delete stuff at
some point. Can you give this a go and let me know if that works
for you (only tested in QEMU with the raspi2 model):

diff --git a/drivers/irqchip/irq-bcm2836.c 
b/drivers/irqchip/irq-bcm2836.c
index 85df6ddad9be..97838eb705f9 100644
--- a/drivers/irqchip/irq-bcm2836.c
+++ b/drivers/irqchip/irq-bcm2836.c
@@ -193,6 +193,8 @@ static void bcm2836_arm_irqchip_ipi_send_mask(struct 
irq_data *d,

  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,
  	.ipi_send_mask	= bcm2836_arm_irqchip_ipi_send_mask,
  };


Thanks again,

         M.
-- 
Jazz is not dead. It just smells funny...