diff options
Diffstat (limited to 'drivers/iommu/rockchip-iommu.c')
| -rw-r--r-- | drivers/iommu/rockchip-iommu.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c index 4015560bf486..31004c040578 100644 --- a/drivers/iommu/rockchip-iommu.c +++ b/drivers/iommu/rockchip-iommu.c @@ -551,6 +551,15 @@ static void rk_iommu_zap_iova(struct rk_iommu_domain *rk_domain, spin_unlock_irqrestore(&rk_domain->iommus_lock, flags); } +static void rk_iommu_zap_iova_first_last(struct rk_iommu_domain *rk_domain, + dma_addr_t iova, size_t size) +{ + rk_iommu_zap_iova(rk_domain, iova, SPAGE_SIZE); + if (size > SPAGE_SIZE) + rk_iommu_zap_iova(rk_domain, iova + size - SPAGE_SIZE, + SPAGE_SIZE); +} + static u32 *rk_dte_get_page_table(struct rk_iommu_domain *rk_domain, dma_addr_t iova) { @@ -575,12 +584,6 @@ static u32 *rk_dte_get_page_table(struct rk_iommu_domain *rk_domain, rk_table_flush(page_table, NUM_PT_ENTRIES); rk_table_flush(dte_addr, 1); - /* - * Zap the first iova of newly allocated page table so iommu evicts - * old cached value of new dte from the iotlb. - */ - rk_iommu_zap_iova(rk_domain, iova, SPAGE_SIZE); - done: pt_phys = rk_dte_pt_address(dte); return (u32 *)phys_to_virt(pt_phys); @@ -630,6 +633,14 @@ static int rk_iommu_map_iova(struct rk_iommu_domain *rk_domain, u32 *pte_addr, rk_table_flush(pte_addr, pte_count); + /* + * Zap the first and last iova to evict from iotlb any previously + * mapped cachelines holding stale values for its dte and pte. + * We only zap the first and last iova, since only they could have + * dte or pte shared with an existing mapping. + */ + rk_iommu_zap_iova_first_last(rk_domain, iova, size); + return 0; unwind: /* Unmap the range of iovas that we just mapped */ |