linux-kernel - Re: [PATCH v8 06/11] irqchip: mips-cpu: Convert to simple domain

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Date:   Wed, 25 Mar 2020 16:04:37 +0100
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Jiaxun Yang <jiaxun.yang@...goat.com>
Cc:     Marc Zyngier <maz@...nel.org>, linux-mips@...r.kernel.org,
        Huacai Chen <chenhc@...ote.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Allison Randal <allison@...utok.net>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v8 06/11] irqchip: mips-cpu: Convert to simple domain

On Wed, Mar 25, 2020 at 10:31:21PM +0800, Jiaxun Yang wrote:
> 
> 
> 于 2020年3月25日 GMT+08:00 下午10:15:16, Marc Zyngier <maz@...nel.org> 写到:
> >On 2020-03-25 13:59, Jiaxun Yang wrote:
> >
> >[...]
> >
> >>>> So probably we can use legacy domain when  MIPS IRQ BASE is in the
> >>>> range of legacy IRQ
> >>>> and switch to simple domain when it's not in that range?
> >>> 
> >>> No, see below.
> >>> 
> >>>> Here in Loongson systems IRQ 0-15 is occupied by I8259 so I did
> >this
> >>>> hack.
> >>> 
> >>> Well, if you have to consider which Linux IRQ gets assigned,
> >>> then your platform is definitely not ready for non-legacy
> >>> irqdomains. Just stick to legacy for now until you have removed
> >>> all the code that knows the hwirq mapping.
> >> 
> >> Thanks.
> >> 
> >> So I have to allocate irq_desc here in driver manually?
> >
> >No, you are probably better off just dropping this patch, as MIPS
> >doesn't seem to be ready for a wholesale switch to virtual interrupts.
> 
> It can't work without this patch.
> 
> Legacy domain require IRQ number within 0-15 
> however it's already occupied by i8259 or "HTPIC" driver.

what's the problem here ? AFAIK there could be more than one
legacy domain, at least that's what at least IP22/SNI in MIPS world 
are doing.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]