Messages in this thread | | | Date | Mon, 24 Apr 2006 11:41:05 -0700 | From | Stephen Hemminger <> | Subject | better leve triggered IRQ management needed |
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I am seeing repeated problems with misconfigured systems that have shared IRQ devices configured for edge-triggered. Also, network devices using NAPI won't work reliably on edge-triggered IRQ's. The kernel IRQ architecture doesn't have sufficient information to detect this at boot time. We should fail request_irq() if the SA_SHIRQ but the irq is edge-triggered.
Right now the concept of level vs edge triggered is buried in things like ELCR for old PIC, and other stuff for IO-APIC. There is a IRQ_LEVEL flag in the descriptor field but nothing sets it or uses it.
Haven't even looked at non i386 arch's but probably even more confusion there.
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