linux-kernel - Re: [PATCH] irqchip/bcm-6345-l1: fix SMP support

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Message-Id: <B78512C9-E73F-45E2-B7D8-C184D9A273A0@gmail.com>
Date:   Tue, 23 Feb 2021 13:30:06 +0100
From:   Álvaro Fernández Rojas <noltari@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Jonas Gorski <jonas.gorski@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        bcm-kernel-feedback-list@...adcom.com, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] irqchip/bcm-6345-l1: fix SMP support

Hi Florian,

Yes, you’re right, there seems to be a bug, because cpu_number_map() and cpu_logical_map() are returning the same when BCM6358 starts with CMT 1:
[    4.662896] bcm6345_l1_irq_handle: smp_id=0 cpu_logical=1 cpu_number=1

Let’s see if I can fix it…

Best regards,
Álvaro.

> El 22 feb 2021, a las 22:00, Florian Fainelli <f.fainelli@...il.com> escribió:
> 
> 
> 
> On 2/22/2021 12:13 PM, Álvaro Fernández Rojas wrote:
>> Some BCM6358 devices start with Core #1 instead of Core #0.
>> Apart from that, SMP is restricted to 1 CPU since BCM6358 has a shared TLB,
>> which makes it impossible for the current SMP support to start both CPUs.
>> 
>> The problem is that smp_processor_id() returns 0 and then cpu_logical_map()
>> converts that to 1, which accesses an uninitialized position of intc->cpus[],
>> resulting in a kernel panic.
> 
> Sounds like you nee to correct the way the cpu_logical_map[] is
> populated then?
> -- 
> Florian