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 18:39:04 +0700 Message-ID: <56CC44D8.4080604@amd.com> References: <1455182127-17551-1-git-send-email-Suravee.Suthikulpanit@amd.com> <20160223110406.GA22747@8bytes.org> <56CC422E.7050905@amd.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <56CC422E.7050905-5C7GfCeVMHo@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 On 02/23/2016 06:27 PM, Suravee Suthikulpanit wrote: > 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 Actually, my V5 is rebased from tips which has moved several files. I think we might need to create a separate patch series to fix this issue in older kernels. Which branch should I rebase my changes for the older kernel? Suravee