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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