linux-kernel - [PATCH v2 00/12] iommu/vt-d: Optimize the use of locks

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Message-Id: <20220614025137.1632762-1-baolu.lu@linux.intel.com>
Date:   Tue, 14 Jun 2022 10:51:25 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>, Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Jason Gunthorpe <jgg@...dia.com>
Cc:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Liu Yi L <yi.l.liu@...el.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH v2 00/12] iommu/vt-d: Optimize the use of locks

Hi folks,

This series tries to optimize the uses of two locks in the Intel IOMMU
driver:

- The intel_iommu::lock is used to protect the IOMMU resources shared by
  devices. They include the IOMMU root and context tables, the pasid
  tables and the domain IDs.
- The global device_domain_lock is used to protect the global and the
  per-domain device tracking lists.

The optimization includes:

- Remove the unnecessary global device tracking list;
- Remove unnecessary locking;
- Reduce the scope of the lock as much as possible, that is, use the
  lock only where necessary;
- The global lock is transformed into a local lock to improve the
  efficiency.

This series is also available on github:
https://github.com/LuBaolu/intel-iommu/commits/intel-iommu-lock-optimization-v2

Your comments and suggestions are very appreciated.

Best regards,
baolu

Change log:

v2:
 - Split the lock-free page walk issue into a new patch:
   https://lore.kernel.org/linux-iommu/20220609070811.902868-1-baolu.lu@linux.intel.com/
 - Drop the conversion from spinlock to mutex and make this series
   cleanup purpose only.
 - Address several comments received during v1 review.

v1:
 - https://lore.kernel.org/linux-iommu/20220527063019.3112905-1-baolu.lu@linux.intel.com/
 - Initial post.

Lu Baolu (12):
  iommu/vt-d: debugfs: Remove device_domain_lock usage
  iommu/vt-d: Remove for_each_device_domain()
  iommu/vt-d: Remove clearing translation data in disable_dmar_iommu()
  iommu/vt-d: Use pci_get_domain_bus_and_slot() in pgtable_walk()
  iommu/vt-d: Unnecessary spinlock for root table alloc and free
  iommu/vt-d: Acquiring lock in domain ID allocation helpers
  iommu/vt-d: Acquiring lock in pasid manipulation helpers
  iommu/vt-d: Replace spin_lock_irqsave() with spin_lock()
  iommu/vt-d: Check device list of domain in domain free path
  iommu/vt-d: Fold __dmar_remove_one_dev_info() into its caller
  iommu/vt-d: Use device_domain_lock accurately
  iommu/vt-d: Convert global spinlock into per domain ones

 drivers/iommu/intel/iommu.h   |   5 +-
 drivers/iommu/intel/pasid.h   |   1 +
 drivers/iommu/intel/debugfs.c |  55 ++++---
 drivers/iommu/intel/iommu.c   | 279 ++++++++++------------------------
 drivers/iommu/intel/pasid.c   | 149 +++++++++---------
 drivers/iommu/intel/svm.c     |   5 +-
 6 files changed, 185 insertions(+), 309 deletions(-)

-- 
2.25.1