From mboxrd@z Thu Jan 1 00:00:00 1970 From: Suravee Suthikulpanit Subject: Re: [PATCH V4 0/6] perf/amd/iommu: Enable multi-IOMMU support Date: Tue, 23 Feb 2016 18:27:42 +0700 Message-ID: <56CC422E.7050905@amd.com> References: <1455182127-17551-1-git-send-email-Suravee.Suthikulpanit@amd.com> <20160223110406.GA22747@8bytes.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20160223110406.GA22747-zLv9SwRftAIdnm+yROfE0A@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: Joerg Roedel Cc: iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, acme-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, andihartmann-KuiJ5kEpwI6ELgA04lAiVw@public.gmane.org, mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org List-Id: iommu@lists.linux-foundation.org Hi, On 02/23/2016 06:04 PM, Joerg Roedel wrote: > Hi Suravee, > > On Thu, Feb 11, 2016 at 04:15:21PM +0700, Suthikulpanit, Suravee wrote: >> From: Suravee Suthikulpanit >> >> This patch series modifies the existing perf_event_amd_iommu driver >> to support systems with multiple IOMMUs. It introduces new AMD IOMMU APIs, >> which are used by the AMD IOMMU Perf driver to access performance >> counters in multiple IOMMUs. >> >> In addition, this series should also fix current AMD IOMMU PMU driver >> initialization issue in some existing KV and CZ platform, where it fails >> to write to IOMMU perf counter as reported by Andreas Hartmann here >> (http://comments.gmane.org/gmane.linux.kernel.pci/49147). > > Since that problem also affects older kernels, we need a stand-alone > fix for this initialization issue. We can't backport new features to fix > bugs in old kernels. > > > Joerg > OK, I am spliting V5 into two part. First would be just to fix the issue. Then the second part would be to add the multiple IOMMU support. Suravee