Messages in this thread | | | Subject | RE: [PATCH v2 2/2] Crypto: Talitos: Support for Async_tx XOR offload | Date | Fri, 18 Dec 2009 23:02:22 +0800 | From | "Li Yang-R58472" <> |
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>Subject: Re: [PATCH v2 2/2] Crypto: Talitos: Support for >Async_tx XOR offload > >Ira W. Snyder wrote: >> Yes, I have used the device_prep_dma_interrupt() >functionality quite a >> while back. However, I found it to be pretty much useless. > >The specific case it is needed for Talitos/raid is a channel >switch interrupt. The interrupt causes the cleanup operation >to be run which will kick off any pending dependent operations >on the xor channel. In the raid case we only have callbacks >at the end of a chain, so we need the interrupt to kick the >engine in an operation chain like >xor->copy->xor->callback.
I am wondering if can use more callbacks to kick off pending dependent operations? Like xor->callback->copy->callback->xor->callback?
- Leo
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