From: Jeff Garzik <jeff@garzik.org>
To: Stephen Hemminger <shemminger@osdl.org>
Cc: Greg KH <greg@kroah.com>, Andi Kleen <ak@suse.de>,
linux-pci@atrey.karlin.mff.cuni.cz, acurrid@nvidia.com,
amartin@nvidia.com, Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: MSI failure on Nvidia nForce
Date: Tue, 18 Apr 2006 14:37:44 -0400 [thread overview]
Message-ID: <444531F8.3040109@garzik.org> (raw)
In-Reply-To: <20060418111944.6ed0505e@localhost.localdomain>
Stephen Hemminger wrote:
> I got a report of sky2 driver irq test failing on x86_64 using
> the following configuration. Is this a known problem?
> Should workaround be done at PCI layer?
>
> What the driver does is setup MSI handler, then do a software generated
> IRQ and check that it was received (similar to tg3). If IRQ test fails
> it falls back to INTx.
Please describe precisely -how- it fails.
pci_enable_msi() does not fail properly on systems that do not support
MSI. This is a major unresolved problem that is preventing MSI
deployment, and causing every driver writer to include a does-MSI-work
test in their driver.
We need to find a good generic test, or if that fails, adopt an
ACPI-like rule: whitelist systems with working MSI before $X date, and
blacklist systems with broken MSI after $X date.
Jeff
next parent reply other threads:[~2006-04-18 18:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20060418111944.6ed0505e@localhost.localdomain>
2006-04-18 18:37 ` Jeff Garzik [this message]
2006-04-18 18:48 ` MSI failure on Nvidia nForce Stephen Hemminger
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