[PATCH v11 00/10] perf/amd/iommu: Enable multi-IOMMU support

From: Suravee Suthikulpanit
Date: Fri Feb 24 2017 - 03:49:50 EST


From: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>

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-v11

Changes from V10 (https://lkml.org/lkml/2017/2/15/1202)
* Introduce amd_iommu specific struct in struct hw_perf_event
(patch 9/10).
* Minor clean up on pr_info (patch 1/10 per Joe Perches).

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 (10):
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: Introduce amd_iommu-specific struct in struct
hw_perf_event
perf/amd/iommu: Enable support for multiple IOMMUs

arch/x86/events/amd/iommu.c | 326 +++++++++++++++++++---------------------
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 -
include/linux/perf_event.h | 12 ++
7 files changed, 247 insertions(+), 227 deletions(-)

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1.8.3.1