linux-kernel - Re: [PATCH] pci: change msi-x vector to 32bit

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Message-ID: <86802c440808152342m772d5eabs59a9c93ffe4cf557@mail.gmail.com>
Date:	Fri, 15 Aug 2008 23:42:25 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Jesse Barnes" <jbarnes@...tuousgeek.org>,
	"James Bottomley" <James.Bottomley@...senpartnership.com>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	"Andrew Vasquez" <andrew.vasquez@...gic.com>
Subject: Re: [PATCH] pci: change msi-x vector to 32bit

On Fri, Aug 15, 2008 at 8:26 PM, H. Peter Anvin <hpa@...or.com> wrote:
> The 28 bits aren't enough, are they: we need domain as well (and surely we can have more than 16 domains?)

current code
static unsigned int build_irq_for_pci_dev(struct pci_dev *dev)
{
        unsigned int irq;

        irq = dev->bus->number;
        irq <<= 8;
        irq |= dev->devfn;
        irq <<= 12;

        return irq;
}

int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
{
        unsigned int irq;
        int ret;
        unsigned int irq_want;

        irq_want = build_irq_for_pci_dev(dev) + 0x100;

        irq = create_irq(irq_want);

domain is not used yet.

need to make vecter_irq to vector_domain_irq

irq_desc(irq) change to domain_irq_desc(domain, irq)

...

YH

YH
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