From mboxrd@z Thu Jan 1 00:00:00 1970 From: Clemens Ladisch Subject: Re: AMD-Vi regression with PCIe/PCI bridges in 4.4 Date: Tue, 5 Apr 2016 15:15:10 +0200 Message-ID: <5703BA5E.3060005@ladisch.de> References: <5700BF69.2080102@ladisch.de> <57038D1F.7040205@ladisch.de> <20160405101530.GA4203@suse.de> <5703AEE6.4010304@ladisch.de> <5703B1F3.6000505@math.uwb.edu.pl> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <5703B1F3.6000505-FRiIMV821htubak7+UBa2Q@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Tomasz Golinski , Joerg Roedel , martin , bellamorte42-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org Cc: iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org List-Id: iommu@lists.linux-foundation.org Tomasz Golinski wrote: > On 05.04.2016 14:26, Clemens Ladisch wrote: >> Martin/Tomasz, could we get the amd_iommu_dump dmesg output for an >> earlier kernel? > > It's for 4.1.15. > ... > [ 0.486934] AMD-Vi: DEV_SPECIAL(IOAPIC[5]) devid: 00:14.0 > [ 0.569054] AMD-Vi: Found IOMMU at 0000:00:00.2 cap 0x40 All those "iommu: Adding device x to group y" messages from 4.4 are missing. Apparently, something caused the IOMMU to be enabled. Tomasz, could you please compare the configurations (/lib/modules/(version)/build/.config) with "diff -u" or something like that? Regards, Clemens