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...@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...@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 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
