linux-kernel - [PATCH v3 10/33] iommu/mediatek: Add tlb_lock in tlb_flush

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Date:   Thu, 23 Sep 2021 19:58:17 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Joerg Roedel <joro@...tes.org>, Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Tomasz Figa <tfiga@...omium.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>, <yong.wu@...iatek.com>,
        <youlin.pei@...iatek.com>, <anan.sun@...iatek.com>,
        <chao.hao@...iatek.com>, <yen-chang.chen@...iatek.com>
Subject: [PATCH v3 10/33] iommu/mediatek: Add tlb_lock in tlb_flush_all

The tlb_flush_all also touches the registers about tlb operations.
Add spinlock in it to protect the tlb registers. since the tlb_range
already hold the spinlock, move it a bit outside the spinlock to
print log.

Signed-off-by: Yong Wu <yong.wu@...iatek.com>
---
 drivers/iommu/mtk_iommu.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 0b4c30baa864..ab484d20b441 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -204,15 +204,24 @@ static struct mtk_iommu_domain *to_mtk_domain(struct iommu_domain *dom)
 	return container_of(dom, struct mtk_iommu_domain, domain);
 }
 
-static void mtk_iommu_tlb_flush_all(struct mtk_iommu_data *data)
+static void mtk_iommu_tlb_do_flush_all(struct mtk_iommu_data *data)
 {
-	if (pm_runtime_get_if_in_use(data->dev) <= 0)
-		return;
+	unsigned long flags;
 
+	spin_lock_irqsave(&data->tlb_lock, flags);
 	writel_relaxed(F_INVLD_EN1 | F_INVLD_EN0,
 		       data->base + data->plat_data->inv_sel_reg);
 	writel_relaxed(F_ALL_INVLD, data->base + REG_MMU_INVALIDATE);
 	wmb(); /* Make sure the tlb flush all done */
+	spin_unlock_irqrestore(&data->tlb_lock, flags);
+}
+
+static void mtk_iommu_tlb_flush_all(struct mtk_iommu_data *data)
+{
+	if (pm_runtime_get_if_in_use(data->dev) <= 0)
+		return;
+
+	mtk_iommu_tlb_do_flush_all(data);
 
 	pm_runtime_put(data->dev);
 }
@@ -247,14 +256,16 @@ static void mtk_iommu_tlb_flush_range_sync(unsigned long iova, size_t size,
 		/* tlb sync */
 		ret = readl_poll_timeout_atomic(data->base + REG_MMU_CPE_DONE,
 						tmp, tmp != 0, 10, 1000);
+
+		/* Clear the CPE status */
+		writel_relaxed(0, data->base + REG_MMU_CPE_DONE);
+		spin_unlock_irqrestore(&data->tlb_lock, flags);
+
 		if (ret) {
 			dev_warn(data->dev,
 				 "Partial TLB flush timed out, falling back to full flush\n");
-			mtk_iommu_tlb_flush_all(data);
+			mtk_iommu_tlb_do_flush_all(data);
 		}
-		/* Clear the CPE status */
-		writel_relaxed(0, data->base + REG_MMU_CPE_DONE);
-		spin_unlock_irqrestore(&data->tlb_lock, flags);
 
 		if (has_pm)
 			pm_runtime_put(data->dev);
-- 
2.18.0