On Sun, Jul 15, 2018 at 12:29:37PM -0400, John David Anglin wrote: > On 2018-07-13 4:14 AM, Helge Deller wrote: >> On 11.07.2018 17:34, Christoph Hellwig wrote: >>> ping? Any comments? >> I applied those 3 patches on top of git head, and booted the >> 32-bit kernel on a HP 715/64 (PCX-L) and a HP B160L (PCX-L2). >> On both machines I had problems with those drivers which use >> DMA (I checked specifically the lasi NIC card, which is the >> main onboard NIC card in both machines). >> Getting IP via DHCP was unreliable, pings on the same network >> to both machines gave lost packets, login via ssh sometimes failed >> and so on. >> >> So, there is definitively some cache-flush missing in this patchset. > Possibly, the code should use flush_kernel_vmap_range() as it purges the > TLB entries used > for the cache flush. Some of the routines in pci-dma.c currently use it.
That might be worth a try and is already discussed in my description. Also it might be good to check that the last patch really is the culprit, I'm pretty certain it is, but a double check never hurts. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
