On Fri, Jun 22, 2007 at 05:27:50PM -0700, Yinghai Lu wrote: > Andi Kleen wrote: > >On Saturday 23 June 2007 00:19:51 Alan Cox wrote: > >The kdump kernel should be normally all <4GB anyways. You won't > >need any IOMMU for its IO unless you O_DIRECT/sendfile out of /proc/kcore. > >Just don't do that (but I suspect it won't work anyways) > > > >If it's not then swiotlb will also not work because it won't get > >any memory <4GB. > > > >But I doubt this was YH's problem - the panic kernel memory > >is always reserved and there shouldn't be any ongoing DMAs in this > >area anyways. And what happens outside the kdump kernel shouldn't matter. > > > >I suspect he rather saw problems with non kdump kexec where we > >can just shut down the GART properly beforehand. > > current I only test kexec only. So clean shut GART in first kernel will > help. > > where is hook for shutdown? add one in dma_ops?
I was wondering the same thing. I think it should hook into the standard device model. It definitely should *not* be in the dma_ops (it has nothing to do with DMA...) - if needed for this or something else we should add a struct iommu_ops which includes a dma_ops member. Cheers, Muli - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
