|From:||Michael Raymond <mraymond-AT-sgi.com>|
|To:||Peter Chubb <peterc-AT-gelato.unsw.edu.au>|
|Subject:||Re: User mode drivers: part 1, interrupt handling (patch for 2.6.11)|
|Date:||Fri, 11 Mar 2005 07:50:32 -0600|
I have many users asking for something like this. Peter's approach is simple and it appears to solve the problem for many situations. With that in mind though, for a more complicated but higher performing approach please take a look at the User Level Interrupt (ULI) project at http://oss.sgi.com/projects/uli/. It requires some per-arch assembly but with some recent changes we're seeing ~1.5us latency from hardware event to user space function start. I'm hoping to add an IA32 port out soon. Thanks, Michael On Fri, Mar 11, 2005 at 02:36:10PM +1100, Peter Chubb wrote: > > As many of you will be aware, we've been working on infrastructure for > user-mode PCI and other drivers. The first step is to be able to > handle interrupts from user space. Subsequent patches add > infrastructure for setting up DMA for PCI devices. -- Michael A. Raymond Office: (651) 683-3434 Core OS Group Real-Time System Software
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