From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joerg Roedel Subject: Re: [PATCH V4 0/6] perf/amd/iommu: Enable multi-IOMMU support Date: Tue, 23 Feb 2016 12:04:06 +0100 Message-ID: <20160223110406.GA22747@8bytes.org> References: <1455182127-17551-1-git-send-email-Suravee.Suthikulpanit@amd.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <1455182127-17551-1-git-send-email-Suravee.Suthikulpanit-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: Suravee Suthikulpanit 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 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