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. - Convert spinlock into mutex so that non-critical functions could be called when the lock is held. This series is also available on github: https://github.com/LuBaolu/intel-iommu/commits/intel-iommu-lock-optimization-v1 Your comments and suggestions are very appreciated. Best regards, baolu Lu Baolu (12): iommu/vt-d: Use iommu_get_domain_for_dev() in debugfs 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: Unncessary 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 device_domain_lock into per-domain mutex drivers/iommu/intel/iommu.h | 5 +- drivers/iommu/intel/debugfs.c | 26 ++-- drivers/iommu/intel/iommu.c | 271 +++++++++------------------------- drivers/iommu/intel/pasid.c | 143 +++++++++--------- drivers/iommu/intel/svm.c | 5 +- 5 files changed, 147 insertions(+), 303 deletions(-) -- 2.25.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
