From 9197bc958fc98ce17341636b3368f180a23d9653 Mon Sep 17 00:00:00 2001 From: Robin Murphy Date: Fri, 21 May 2021 14:49:39 +0100 Subject: iommu/rockchip: Remove redundant DMA syncs When we allocate new pagetable pages, we don't modify them between the initial dma_map_single() call and the dma_sync_single_for_device() call via rk_iommu_flush(), so the latter is entirely pointless. Signed-off-by: Robin Murphy Link: https://lore.kernel.org/r/5c29a9ff0a20df0167635b1901f94b5195c1fb28.1621604979.git.robin.murphy@arm.com Signed-off-by: Joerg Roedel --- drivers/iommu/rockchip-iommu.c | 3 --- 1 file changed, 3 deletions(-) (limited to 'drivers/iommu/rockchip-iommu.c') diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c index 7a2932772fdf..e5116d6a6260 100644 --- a/drivers/iommu/rockchip-iommu.c +++ b/drivers/iommu/rockchip-iommu.c @@ -682,7 +682,6 @@ static u32 *rk_dte_get_page_table(struct rk_iommu_domain *rk_domain, dte = rk_mk_dte(pt_dma); *dte_addr = dte; - rk_table_flush(rk_domain, pt_dma, NUM_PT_ENTRIES); rk_table_flush(rk_domain, rk_domain->dt_dma + dte_index * sizeof(u32), 1); done: @@ -1004,8 +1003,6 @@ static struct iommu_domain *rk_iommu_domain_alloc(unsigned type) goto err_free_dt; } - rk_table_flush(rk_domain, rk_domain->dt_dma, NUM_DT_ENTRIES); - spin_lock_init(&rk_domain->iommus_lock); spin_lock_init(&rk_domain->dt_lock); INIT_LIST_HEAD(&rk_domain->iommus); -- cgit