linux-kernel - [PATCH v2 0/5] Batch IOTLB/dev-IOTLB invalidation

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Message-Id: <20240809025431.14605-1-tina.zhang@intel.com>
Date: Fri,  9 Aug 2024 10:54:26 +0800
From: Tina Zhang <tina.zhang@...el.com>
To: Lu Baolu <baolu.lu@...ux.intel.com>,
	Kevin Tian <kevin.tian@...el.com>
Cc: iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Tina Zhang <tina.zhang@...el.com>
Subject: [PATCH v2 0/5] Batch IOTLB/dev-IOTLB invalidation

IOTLB and dev-IOTLB invalidation operations are performance-critical.
The current implementation in the VT-d driver submits these commands
individually, leading to some inefficiencies due to the IOMMU
programming and invalidation command processing overhead for each
operation.

This patch series enhances the efficiency of Queue Invalidation (QI)
operations by adding support for batch processing. Microbenchmarks
show that with a DSA device working in SVA, batching IOTLB and dev-IOTLB
invalidations can decrease the time spent in qi_submit_sync()
by roughly more than 800 cycles.

Changelog
v2:
 * Rebased on 6.11-rc2
 * Updated commit messages
 * Added changes of refactoring IOTLB/Dev-IOTLB invalidation logic
   and quirk_extra_dev_tlb_flush() logic

v1:
 https://lore.kernel.org/linux-iommu/20240517003728.251115-1-tina.zhang@intel.com/

Tina Zhang (5):
  iommu/vt-d: Refactor IOTLB/Dev-IOTLB invalidation command logic
  iommu/vt-d: Refactor IOTLB and Dev-IOTLB flush logic
  iommu/vt-d: Introduce interfaces for QI batching operations
  vt-d/iommu: Refactor quirk_extra_dev_tlb_flush()
  vt-d/iommu: Enable batching of IOTLB/Dev-IOTLB invalidations

 drivers/iommu/intel/cache.c | 269 ++++++++++++++++++++++++++--------
 drivers/iommu/intel/dmar.c  | 281 +++++++++++++++++++++++++-----------
 drivers/iommu/intel/iommu.c |  56 +++++--
 drivers/iommu/intel/iommu.h |  44 ++++++
 drivers/iommu/intel/svm.c   |   5 +-
 5 files changed, 491 insertions(+), 164 deletions(-)

-- 
2.43.0