Hi Tomo, FUJITA Tomonori wrote: > On Sat, 8 Sep 2007 13:00:36 +0100 > Christoph Hellwig <[EMAIL PROTECTED]> wrote: > >> On Sat, Sep 08, 2007 at 07:32:27AM -0400, Jeff Garzik wrote: >>> FUJITA Tomonori wrote: >>>> Yeah, iommu code ignores the lld limitations (the problem is that the >>>> lld limitations are in request_queue and iommu code can't access to >>>> request_queue). There is no way to tell iommu code about the lld >>>> limitations. >>> >>> This fact very much wants fixing. >> >> Absolutely. Unfortunately everyone wastes their time on creating workarounds >> instead of fixing the underlying problem. > > Any ideas on how to fix this? > > I chatted to Jens and James on this last week. > > - we could just copies the lld limitations to device structure. it's > hacky but device structure already has hacky stuff. > > - we could just link device structure to request_queue structure so > that iommu code can see request_queue structure. > > - we could remove the lld limitations in request_queue strucutre and > have a new strucutre (something like struct io_restrictions). then > somehow we could link the new structure with request_queue and device > strucutres. > I'd prefer the latter. These struct io_restrictions could then be used by dm (which has it's own version right now) to merge queue capabilities.
Cheers, Hannes -- Dr. Hannes Reinecke zSeries & Storage [EMAIL PROTECTED] +49 911 74053 688 SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: Markus Rex, HRB 16746 (AG Nürnberg) - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
