Messages in this thread |  | | From | Lu Baolu <> | Subject | [PATCH v3 00/11] iommu/vt-d: Optimize the use of locks | Date | Wed, 29 Jun 2022 15:47:14 +0800 |
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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-v3
Your comments and suggestions are very appreciated.
Best regards, baolu
Change log:
v3: - Split reduction of lock ranges from changing irqsave. https://lore.kernel.org/linux-iommu/BN9PR11MB52760A3D7C6BF1AF9C9D34658CAA9@BN9PR11MB5276.namprd11.prod.outlook.com/ - Fully initialize the dev_info before adding it to the list. https://lore.kernel.org/linux-iommu/BN9PR11MB52764D7CD86448C5E4EB46668CAA9@BN9PR11MB5276.namprd11.prod.outlook.com/ - Various code and comments refinement.
v2: - https://lore.kernel.org/linux-iommu/20220614025137.1632762-1-baolu.lu@linux.intel.com/ - 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 (11): iommu/vt-d: debugfs: Remove device_domain_lock usage 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: Replace spin_lock_irqsave() with spin_lock() iommu/vt-d: Acquiring lock in domain ID allocation helpers iommu/vt-d: Acquiring lock in pasid manipulation helpers 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 lock
drivers/iommu/intel/iommu.h | 3 +- drivers/iommu/intel/pasid.h | 1 + drivers/iommu/intel/debugfs.c | 49 ++++--- drivers/iommu/intel/iommu.c | 248 ++++++++++------------------------ drivers/iommu/intel/pasid.c | 103 +++++++------- drivers/iommu/intel/svm.c | 5 +- 6 files changed, 164 insertions(+), 245 deletions(-)
-- 2.25.1
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