From: David Howells <dhowells@redhat.com>
To: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: dhowells@redhat.com, Jesse Barnes <jbarnes@virtuousgeek.org>,
linux-pci@vger.kernel.org, linux-arch@vger.kernel.org,
Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
Russell King <rmk@arm.linux.org.uk>,
Ralf Baechle <ralf@linux-mips.org>,
Kyle McMartin <kyle@parisc-linux.org>,
Matthew Wilcox <matthew@wil.cx>,
Grant Grundler <grundler@parisc-linux.org>,
Paul Mackerras <paulus@samba.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mundt <lethal@linux-sh.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
hpa@zytor.com
Subject: Re: [PATCH 05/12] PCI: add pci_swizzle_interrupt_pin()
Date: Thu, 11 Dec 2008 17:34:52 +0000 [thread overview]
Message-ID: <24742.1229016892@redhat.com> (raw)
In-Reply-To: <200812110948.20563.bjorn.helgaas@hp.com>
Bjorn Helgaas <bjorn.helgaas@hp.com> wrote:
> +/**
> + * pci_swizzle_interrupt_pin - swizzle INTx for device behind bridge
> + * @dev: the PCI device
> + * @pin: the INTx pin (1=INTA, 2=INTB, 3=INTD, 4=INTD)
> + *
> + * The PCI-to-PCI bridge specification requires INTx swizzling for
> + * devices behind bridges on add-in cards. This performs the swizzle
> + * for one level of bridge.
> + */
Better.
> +u8 pci_swizzle_interrupt_pin(struct pci_dev *dev, u8 pin)
> +{
> + /* This implements Table 9-1 of the PCI-to-PCI bridge spec */
I'd recommend merging this comment into the banner.
> + return (((pin - 1) + PCI_SLOT(dev->devfn)) % 4) + 1;
> +}
> +
David
next prev parent reply other threads:[~2008-12-11 17:36 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-09 23:11 [PATCH 00/12] PCI: unify P2P bridge INTx swizzling Bjorn Helgaas
2008-12-09 23:11 ` [PATCH 01/12] PCI Hotplug: cpqphp: use config space PCI interrupt pin encoding Bjorn Helgaas
2008-12-09 23:11 ` Bjorn Helgaas
2008-12-09 23:11 ` [PATCH 02/12] PCI: use config space encoding in pci_get_interrupt_pin() Bjorn Helgaas
2008-12-09 23:11 ` Bjorn Helgaas
2008-12-09 23:11 ` [PATCH 03/12] x86/PCI: use config space encoding for interrupt pins Bjorn Helgaas
2008-12-09 23:11 ` [PATCH 04/12] x86/PCI: minor logic simplications Bjorn Helgaas
2008-12-09 23:11 ` Bjorn Helgaas
2008-12-09 23:12 ` [PATCH 05/12] PCI: add pci_swizzle_interrupt_pin() Bjorn Helgaas
2008-12-09 23:12 ` Bjorn Helgaas
2008-12-11 15:00 ` David Howells
2008-12-11 16:48 ` Bjorn Helgaas
2008-12-11 16:48 ` Bjorn Helgaas
2008-12-11 17:34 ` David Howells [this message]
2008-12-11 18:03 ` Bjorn Helgaas
2008-12-11 18:14 ` David Howells
2008-12-11 18:14 ` David Howells
2008-12-11 18:24 ` Bjorn Helgaas
2008-12-09 23:12 ` [PATCH 06/12] PCI: alpha: use generic pci_swizzle_interrupt_pin() Bjorn Helgaas
2008-12-09 23:12 ` [PATCH 07/12] PCI: arm: " Bjorn Helgaas
2008-12-09 23:12 ` Bjorn Helgaas
2008-12-09 23:12 ` [PATCH 08/12] PCI: mips: " Bjorn Helgaas
2008-12-10 13:35 ` Ralf Baechle
2008-12-10 13:35 ` Ralf Baechle
2008-12-09 23:12 ` [PATCH 09/12] PCI: parisc: " Bjorn Helgaas
2008-12-09 23:12 ` Bjorn Helgaas
2008-12-09 23:26 ` Kyle McMartin
2008-12-09 23:26 ` Kyle McMartin
2008-12-09 23:12 ` [PATCH 10/12] PCI: powerpc: " Bjorn Helgaas
2008-12-12 20:03 ` Benjamin Herrenschmidt
2008-12-09 23:12 ` [PATCH 11/12] PCI: sh: " Bjorn Helgaas
2008-12-09 23:12 ` Bjorn Helgaas
2008-12-10 3:49 ` Paul Mundt
2008-12-09 23:12 ` [PATCH 12/12] PCI: x86: " Bjorn Helgaas
2008-12-16 20:20 ` [PATCH 00/12] PCI: unify P2P bridge INTx swizzling Jesse Barnes
2008-12-16 20:20 ` Jesse Barnes
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