[PATCH v4 5/7] iommu/mediatek: Move the tlb_sync into tlb_flush

[Yong Wu]

Right now, the tlb_add_flush_nosync and tlb_sync always appear together.
we merge the two functions into one(also move the tlb_lock into the new
function). No functional change.

Signed-off-by: Chao Hao <chao.hao@xxxxxxxxxxxx>
Signed-off-by: Yong Wu <yong.wu@xxxxxxxxxxxx>
---
 drivers/iommu/mtk_iommu.c | 45 ++++++++++-----------------------------------
 drivers/iommu/mtk_iommu.h |  1 -
 2 files changed, 10 insertions(+), 36 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 1d7254c..0e5f41f 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -173,12 +173,16 @@ static void mtk_iommu_tlb_flush_all(void *cookie)
 	}
 }
 
-static void mtk_iommu_tlb_add_flush_nosync(unsigned long iova, size_t size,
+static void mtk_iommu_tlb_flush_range_sync(unsigned long iova, size_t size,
 					   size_t granule, void *cookie)
 {
 	struct mtk_iommu_data *data = cookie;
+	unsigned long flags;
+	int ret;
+	u32 tmp;
 
 	for_each_m4u(data) {
+		spin_lock_irqsave(&data->tlb_lock, flags);
 		writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0,
 			       data->base + REG_MMU_INV_SEL);
 
@@ -187,21 +191,8 @@ static void mtk_iommu_tlb_add_flush_nosync(unsigned long iova, size_t size,
 			       data->base + REG_MMU_INVLD_END_A);
 		writel_relaxed(F_MMU_INV_RANGE,
 			       data->base + REG_MMU_INVALIDATE);
-		data->tlb_flush_active = true;
-	}
-}
-
-static void mtk_iommu_tlb_sync(void *cookie)
-{
-	struct mtk_iommu_data *data = cookie;
-	int ret;
-	u32 tmp;
-
-	for_each_m4u(data) {
-		/* Avoid timing out if there's nothing to wait for */
-		if (!data->tlb_flush_active)
-			return;
 
+		/* tlb sync */
 		ret = readl_poll_timeout_atomic(data->base + REG_MMU_CPE_DONE,
 						tmp, tmp != 0, 10, 100000);
 		if (ret) {
@@ -211,22 +202,10 @@ static void mtk_iommu_tlb_sync(void *cookie)
 		}
 		/* Clear the CPE status */
 		writel_relaxed(0, data->base + REG_MMU_CPE_DONE);
-		data->tlb_flush_active = false;
+		spin_unlock_irqrestore(&data->tlb_lock, flags);
 	}
 }
 
-static void mtk_iommu_tlb_flush_walk(unsigned long iova, size_t size,
-				     size_t granule, void *cookie)
-{
-	struct mtk_iommu_data *data = cookie;
-	unsigned long flags;
-
-	spin_lock_irqsave(&data->tlb_lock, flags);
-	mtk_iommu_tlb_add_flush_nosync(iova, size, granule, cookie);
-	mtk_iommu_tlb_sync(cookie);
-	spin_unlock_irqrestore(&data->tlb_lock, flags);
-}
-
 static void mtk_iommu_tlb_flush_page_nosync(struct iommu_iotlb_gather *gather,
 					    unsigned long iova, size_t granule,
 					    void *cookie)
@@ -239,8 +218,8 @@ static void mtk_iommu_tlb_flush_page_nosync(struct iommu_iotlb_gather *gather,
 
 static const struct iommu_flush_ops mtk_iommu_flush_ops = {
 	.tlb_flush_all = mtk_iommu_tlb_flush_all,
-	.tlb_flush_walk = mtk_iommu_tlb_flush_walk,
-	.tlb_flush_leaf = mtk_iommu_tlb_flush_walk,
+	.tlb_flush_walk = mtk_iommu_tlb_flush_range_sync,
+	.tlb_flush_leaf = mtk_iommu_tlb_flush_range_sync,
 	.tlb_add_page = mtk_iommu_tlb_flush_page_nosync,
 };
 
@@ -455,16 +434,12 @@ static void mtk_iommu_iotlb_sync(struct iommu_domain *domain,
 {
 	struct mtk_iommu_data *data = mtk_iommu_get_m4u_data();
 	size_t length = gather->end - gather->start;
-	unsigned long flags;
 
 	if (gather->start == ULONG_MAX)
 		return;
 
-	spin_lock_irqsave(&data->tlb_lock, flags);
-	mtk_iommu_tlb_add_flush_nosync(gather->start, length, gather->pgsize,
+	mtk_iommu_tlb_flush_range_sync(gather->start, length, gather->pgsize,
 				       data);
-	mtk_iommu_tlb_sync(data);
-	spin_unlock_irqrestore(&data->tlb_lock, flags);
 }
 
 static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain,
diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
index 8cae22d..ea949a3 100644
--- a/drivers/iommu/mtk_iommu.h
+++ b/drivers/iommu/mtk_iommu.h
@@ -57,7 +57,6 @@ struct mtk_iommu_data {
 	struct mtk_iommu_domain		*m4u_dom;
 	struct iommu_group		*m4u_group;
 	bool                            enable_4GB;
-	bool				tlb_flush_active;
 	spinlock_t			tlb_lock; /* lock for tlb range flush */
 
 	struct iommu_device		iommu;
-- 
1.9.1