linux-kernel - Re: [PATCH 2/2 v5] irqchip/Layerscape: Add SCFG MSI controller support

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Message-ID: <56F27914.3080908@arm.com>
Date:	Wed, 23 Mar 2016 11:08:04 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	Alexander Stein <alexander.stein@...tec-electronic.com>,
	linux-kernel@...r.kernel.org
Cc:	Minghuan Lian <Minghuan.Lian@....com>,
	linux-arm-kernel@...ts.infradead.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Roy Zang <roy.zang@....com>, Mingkai Hu <mingkai.hu@....com>,
	Stuart Yoder <stuart.yoder@....com>,
	Yang-Leo Li <leoyang.li@....com>
Subject: Re: [PATCH 2/2 v5] irqchip/Layerscape: Add SCFG MSI controller
 support

On 23/03/16 09:18, Alexander Stein wrote:
> On Monday 07 March 2016 11:36:22, Minghuan Lian wrote:
>> Some kind of NXP Layerscape SoC provides a MSI
>> implementation which uses two SCFG registers MSIIR and
>> MSIR to support 32 MSI interrupts for each PCIe controller.
>> The patch is to support it.
>>
>> Signed-off-by: Minghuan Lian <Minghuan.Lian@....com>
> 
> Tested-by: Alexander Stein <alexander.stein@...tec-electronic.com>
> 
> Using an intel e1000e card which uses 3 MSIs. But the IRQ numbers are a bit strange though:
>> grep eth3 /proc/interrupts
>>
>>  63:         49          0       MSI 134742016 Edge      eth3-rx-0
>>  64:          3          0       MSI 134742017 Edge      eth3-tx-0
>>  65:          4          0       MSI 134742018 Edge      eth3

This is a virtual interrupt number (despite being displayed as a hwirq),
computed from the PCI requester ID and the MSI index. You shouldn't
infer anything from it.

Thanks,

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