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Date:   Wed, 25 Mar 2020 22:31:21 +0800
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Subject: Re: [PATCH v8 06/11] irqchip: mips-cpu: Convert to simple domain
To:     Marc Zyngier <maz@kernel.org>
CC:     Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        linux-mips@vger.kernel.org, Huacai Chen <chenhc@lemote.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Jason Cooper <jason@lakedaemon.net>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jonathan Cameron <Jonathan.Cameron@huawei.com>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Allison Randal <allison@lohutok.net>,
        linux-kernel@vger.kernel.org, devicetree@vger.kernel.org
From:   Jiaxun Yang <jiaxun.yang@flygoat.com>
Message-ID: <39CF835E-D1D9-4B52-ABDC-BDB17B650936@flygoat.com>
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=E4=BA=8E 2020=E5=B9=B43=E6=9C=8825=E6=97=A5 GMT+08:00 =E4=B8=8B=E5=8D=881=
0:15:16, Marc Zyngier <maz@kernel=2Eorg> =E5=86=99=E5=88=B0:
>On 2020-03-25 13:59, Jiaxun Yang wrote:
>
>[=2E=2E=2E]
>
>>>> 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?
>>>=20
>>> No, see below=2E
>>>=20
>>>> Here in Loongson systems IRQ 0-15 is occupied by I8259 so I did
>this
>>>> hack=2E
>>>=20
>>> Well, if you have to consider which Linux IRQ gets assigned,
>>> then your platform is definitely not ready for non-legacy
>>> irqdomains=2E Just stick to legacy for now until you have removed
>>> all the code that knows the hwirq mapping=2E
>>=20
>> Thanks=2E
>>=20
>> 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=2E

It can't work without this patch=2E

Legacy domain require IRQ number within 0-15=20
however it's already occupied by i8259 or "HTPIC" driver=2E

Previously Loongson even didn't enable IRQ domain so it's not a problem=2E


>
>         M=2E

--=20
Jiaxun Yang