Messages in this thread | | | Date | Tue, 18 Apr 2006 14:37:44 -0400 | From | Jeff Garzik <> | Subject | Re: MSI failure on Nvidia nForce |
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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
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