linux-kernel - Re: [PATCH 00/16] dyn_array and nr

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Date:	Fri, 1 Aug 2008 19:01:24 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>, hpa <hpa@...or.com>,
	"Dhaval Giani" <dhaval@...ux.vnet.ibm.com>,
	"Mike Travis" <travis@....com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/16] dyn_array and nr_irqs support v2

>> cpu is going to check that vectors in addition to vectors in IDT?
>
> No. The destination cpu and destination vector number are encoded in
> the MSI message.  Each MSI-X source ``vector'' has a different MSI message.
>
> So on my wish list is to stably encode the MSI interurrpt numbers.  And
> using a sparse irq address space I can.  As it only takes 28 bits to hold
> the complete bus + device + function + msi source [ 0-4095 ]
>

how about ioapic interrupt numbers...? they should stay with same
numbering with gsi?

and how about pci segments : that will need another 4 bits for AMD
systems..aka 16 segments..

you will run out of 32bits...

BTW:
kstat_irqs patch is there.
How are the progress with irq_cfg/irq_desc dyn allocating patch?

YH
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