diff options
| -rw-r--r-- | drivers/iommu/io-pgtable.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/iommu/io-pgtable.h b/drivers/iommu/io-pgtable.h index 95c5565b6669..4faee7d23ee9 100644 --- a/drivers/iommu/io-pgtable.h +++ b/drivers/iommu/io-pgtable.h @@ -132,12 +132,14 @@ void free_io_pgtable_ops(struct io_pgtable_ops *ops); * @fmt: The page table format. * @cookie: An opaque token provided by the IOMMU driver and passed back to * any callback routines. + * @tlb_sync_pending: Private flag for optimising out redundant syncs. * @cfg: A copy of the page table configuration. * @ops: The page table operations in use for this set of page tables. */ struct io_pgtable { enum io_pgtable_fmt fmt; void *cookie; + bool tlb_sync_pending; struct io_pgtable_cfg cfg; struct io_pgtable_ops ops; }; @@ -147,17 +149,22 @@ struct io_pgtable { static inline void io_pgtable_tlb_flush_all(struct io_pgtable *iop) { iop->cfg.tlb->tlb_flush_all(iop->cookie); + iop->tlb_sync_pending = true; } static inline void io_pgtable_tlb_add_flush(struct io_pgtable *iop, unsigned long iova, size_t size, size_t granule, bool leaf) { iop->cfg.tlb->tlb_add_flush(iova, size, granule, leaf, iop->cookie); + iop->tlb_sync_pending = true; } static inline void io_pgtable_tlb_sync(struct io_pgtable *iop) { - iop->cfg.tlb->tlb_sync(iop->cookie); + if (iop->tlb_sync_pending) { + iop->cfg.tlb->tlb_sync(iop->cookie); + iop->tlb_sync_pending = false; + } } /** |