linux-kernel - [PATCH 08/24] iommu/mediatek: Remove for_each_m4u in tlb_sync

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Message-ID: <20210630023504.18177-9-yong.wu@mediatek.com>
Date:   Wed, 30 Jun 2021 10:34:48 +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>,
        Evan Green <evgreen@...omium.org>,
        Tomasz Figa <tfiga@...gle.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>, <yong.wu@...iatek.com>,
        <youlin.pei@...iatek.com>, Nicolas Boichat <drinkcat@...omium.org>,
        <anan.sun@...iatek.com>, <chao.hao@...iatek.com>
Subject: [PATCH 08/24] iommu/mediatek: Remove for_each_m4u in tlb_sync_all

The tlb_sync_all only is called in
a) flush_iotlb_all: it will called for each iommu HW.
b) tlb_flush_range_sync: it already has for_each_m4u.
c) in irq: it has already fail. no need for_each_m4u to flush

thus, No need for_each_m4u in this tlb_sync_all.
This patch remove it.

Signed-off-by: Yong Wu <yong.wu@...iatek.com>
---
 drivers/iommu/mtk_iommu.c | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 7fe9ebd879fe..ed3455b5cef0 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -208,19 +208,15 @@ static struct mtk_iommu_domain *to_mtk_domain(struct iommu_domain *dom)
 
 static void mtk_iommu_tlb_flush_all(struct mtk_iommu_data *data)
 {
-	struct list_head *head = data->hw_list;
-
-	for_each_m4u(data, head) {
-		if (pm_runtime_get_if_in_use(data->dev) <= 0)
-			continue;
+	if (pm_runtime_get_if_in_use(data->dev) <= 0)
+		return;
 
-		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 */
+	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 */
 
-		pm_runtime_put(data->dev);
-	}
+	pm_runtime_put(data->dev);
 }
 
 static void mtk_iommu_tlb_flush_range_sync(unsigned long iova, size_t size,
-- 
2.18.0