Messages in this thread | | | Date | Tue, 23 Feb 2016 12:04:06 +0100 | From | Joerg Roedel <> | Subject | Re: [PATCH V4 0/6] perf/amd/iommu: Enable multi-IOMMU support |
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Hi Suravee,
On Thu, Feb 11, 2016 at 04:15:21PM +0700, Suthikulpanit, Suravee wrote: > From: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> > > 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
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