linux-kernel - [PATCH v10 0/9] perf/amd/iommu: Enable multi-IOMMU support

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Date:   Wed, 15 Feb 2017 14:56:16 -0600
From:   Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
To:     <linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>
CC:     <bp@...en8.de>, <peterz@...radead.org>, <joro@...tes.org>,
        <mingo@...hat.com>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: [PATCH v10 0/9] perf/amd/iommu: Enable multi-IOMMU support

From: Suravee Suthikulpanit <suravee.suthikulpanit@....com>

This patch series modifies the existing IOMMU and Perf drivers to support
systems with multiple IOMMUs by allocating an amd_iommu PMU per IOMMU instance.
This allows users to specify performance events and filters separately for each
IOMMU.

This has been tested on the new family17h-based server w/ multiple IOMMUs.

Git branch containing this patch series is available here:

    https://github.com/ssuthiku/linux.git  perf-iommu-v10

Changes from V9 (https://lkml.org/lkml/2017/2/7/105)
  * Since each IOMMU PMU in a system functions independently from 
    one another, the amd_iommu_pc_init() function has been modified
    to allow certain IOMMU PMU initialization to fail w/o disabling
    the others (patch 9/9).
  * Define a static pmu (iommu_pmu), and stuct assignment directly.
    (per Boris)
  * Refactor code clean up into a separate patch (4/9) (per Boris)

Changes from V8 (https://lkml.org/lkml/2017/1/16/48)
  * Rebase to v4.10
  * Do not use hwc->idx as pmu index. Instead, include pointers
    to struct amd_iommu in the perf_amd_iommu.
  * Do not remove local64_cmpxchg() in perf_iommu_read().
  * Fix incorrect bitfield when using GENMASK_ULL().

Changes from V7 (https://lkml.org/lkml/2017/1/9/917)
  * Re-order patches to clean up first before introducing new stuff.
  * Always use amd_iommu_get_num_iommus() to access amd_iommus_present
    variable now.
  * Fix Perf IOMMU sysfs attributes initialization.
  * Miscellaneous clean up 

Thanks,
Suravee

Suravee Suthikulpanit (9):
  perf/amd/iommu: Declare pr_fmt and remove unnecessary pr_debug
  perf/amd/iommu: Clean up bitwise operations
  perf/amd/iommu: Clean up perf_iommu_read()
  iommu/amd: Clean up iommu_pc_get_set_reg()
  iommu/amd: Introduce amd_iommu_get_num_iommus()
  perf/amd/iommu: Modify functions to query max banks and counters
  perf/amd/iommu: Modify amd_iommu_pc_get_set_reg_val() to      allow
    specifying IOMMU
  perf/amd/iommu: Fix sysfs perf attribute groups
  perf/amd/iommu: Enable support for multiple IOMMUs

 arch/x86/events/amd/iommu.c     | 259 +++++++++++++++++++---------------------
 arch/x86/events/amd/iommu.h     |  18 ++-
 drivers/iommu/amd_iommu.c       |   6 +-
 drivers/iommu/amd_iommu_init.c  | 101 +++++++++-------
 drivers/iommu/amd_iommu_proto.h |   8 +-
 drivers/iommu/amd_iommu_types.h |   3 -
 6 files changed, 198 insertions(+), 197 deletions(-)

-- 
1.8.3.1