linux-kernel - [PATCH V4 0/6] perf/amd/iommu: Enable multi-IOMMU support

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Date:	Thu, 11 Feb 2016 16:15:21 +0700
From:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
To:	<joro@...tes.org>, <bp@...en8.de>, <peterz@...radead.org>,
	<mingo@...hat.com>, <acme@...nel.org>
CC:	<andihartmann@...enet.de>, <linux-kernel@...r.kernel.org>,
	<iommu@...ts.linux-foundation.org>,
	Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: [PATCH V4 0/6] perf/amd/iommu: Enable multi-IOMMU support

From: Suravee Suthikulpanit <suravee.suthikulpanit@....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).

Git branch containing this patch series is available here:

    https://github.com/ssuthiku/linux.git  perf-iommu-v4

Changes from V3 (https://lkml.org/lkml/2016/2/9/845)
  * Rebase the code to tip/master per Boris suggestion
  * Most changes are in patch 5/6:
    * Fix several spelling and styling issues per Boris review comment
    * Remove unnecessary pr_debug in the perf amd iommu driver (per Boris)
    * Rename several function to make it less confusing (per Boris)
    * Properly handle errors when fails to set registers/counters
      on multiple IOMMUs. (per Boris)

Changes from V2 ( https://lkml.org/lkml/2016/1/1/141)
  * Ported to 4.5.0-rc2
  * Add reviewed by Joerg for patch 1 and 2
  * Remove EXPORT_SYMBOL from patch 3 (per Joerg suggestion)
  * Merge patch 4/6 and 6/6 from V2 into 5/5 in V3 and add
    more description in the commit message and in code comment.
  * Patch 5: modify the logic to update counts to get rid off
    un-necessary local64_cmpxchg().

Changes from V1 (https://lkml.org/lkml/2015/12/22/535):
  * Update patch3 and 6 to use amd_iommus_present instead of introducing
    amd_iommu_cnt static variable since they are the same thing

Suravee Suthikulpanit (6):
  perf/amd/iommu: Consolidate and move perf_event_amd_iommu header
  perf/amd/iommu: Modify functions to query max banks and counters
  iommu/amd: Introduce amd_iommu_get_num_iommus()
  perf/amd/iommu: Introduce get_iommu_bnk_cnt_evt_idx
  perf/amd/iommu: Enable support for multiple IOMMUs
  perf/amd/iommu: Declar pr_fmt and remove unnecessary pr_debug

 arch/x86/events/amd/iommu.c           | 197 ++++++++++++++++++++++------------
 arch/x86/events/amd/iommu.h           |  40 -------
 arch/x86/include/asm/perf/amd/iommu.h |  42 ++++++++
 drivers/iommu/amd_iommu_init.c        | 136 +++++++++++++++++++----
 drivers/iommu/amd_iommu_proto.h       |   7 --
 5 files changed, 286 insertions(+), 136 deletions(-)
 delete mode 100644 arch/x86/events/amd/iommu.h
 create mode 100644 arch/x86/include/asm/perf/amd/iommu.h

-- 
2.5.0