linux-kernel - Re: [Patch V3 6/9] genirq: Introduce msi_domain_{alloc|free}

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Date:	Mon, 17 Nov 2014 19:37:37 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ingo Molnar <mingo@...hat.com>,
	Grant Likely <grant.likely@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Yijing Wang <wangyijing@...wei.com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Alexander Gordeev <agordeev@...hat.com>,
	Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [Patch V3 6/9] genirq: Introduce msi_domain_{alloc|free}_irqs()

On 2014/11/17 19:30, Thomas Gleixner wrote:
> On Mon, 17 Nov 2014, Jiang Liu wrote:
>> +
>> +/*
>> + * Default structure for MSI interrupt allocation.
>> + * Arch may overwrite it by defining msi_alloc_info_t.
>> + */
>> +struct msi_alloc_info {
>> +	struct msi_desc			*desc;
>> +	irq_hw_number_t			hwirq;
>> +	union {
>> +		unsigned long		ul;
>> +		void			*ptr;
>> +	} scratchpad[NUM_MSI_ALLOC_SCRATCHPAD_REGS];
>> +};
>> +
>> +#ifndef msi_alloc_info_t
>> +typedef struct msi_alloc_info msi_alloc_info_t;
>> +#endif
> 
> Hmm. Do we really need that?
Hi Thomas,
	Do you mean msi_alloc_info_t? It acts as a flag
to use common struct msi_alloc_info or architecture specific
data structures. For most architecture, they will use the default
struct msi_alloc_info. But for x86, it will use struct irq_alloc_info.
Regards!
Gerry
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