linux-kernel - [PATCH 2/2] iommu/mediatek: Enable allocating page table in normal memory

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Message-ID: <20220429143411.7640-3-yf.wang@mediatek.com>
Date:   Fri, 29 Apr 2022 22:34:10 +0800
From:   <yf.wang@...iatek.com>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        "Will Deacon" <will@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "open list:MEDIATEK IOMMU DRIVER" <iommu@...ts.linux-foundation.org>,
        "moderated list:MEDIATEK IOMMU DRIVER" 
        <linux-mediatek@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list" <linux-kernel@...r.kernel.org>
CC:     <wsd_upstream@...iatek.com>, Libo Kang <Libo.Kang@...iatek.com>,
        Yong Wu <Yong.Wu@...iatek.com>,
        Yunfei Wang <yf.wang@...iatek.com>,
        Ning Li <ning.li@...iatek.com>, <stable@...r.kernel.org>
Subject: [PATCH 2/2] iommu/mediatek: Enable allocating page table in normal memory

From: Yunfei Wang <yf.wang@...iatek.com>

Add the quirk IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT support, so that
level 2 page table can allocate in normal memory.

Signed-off-by: Ning Li <ning.li@...iatek.com>
Signed-off-by: Yunfei Wang <yf.wang@...iatek.com>
Cc: <stable@...r.kernel.org> # 5.10.*
---
 drivers/iommu/mtk_iommu.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 6fd75a60abd6..27481f562df7 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -118,6 +118,7 @@
 #define WR_THROT_EN			BIT(6)
 #define HAS_LEGACY_IVRP_PADDR		BIT(7)
 #define IOVA_34_EN			BIT(8)
+#define PGTABLE_L2_PA_35_EN		BIT(9)
 
 #define MTK_IOMMU_HAS_FLAG(pdata, _x) \
 		((((pdata)->flags) & (_x)) == (_x))
@@ -401,6 +402,9 @@ static int mtk_iommu_domain_finalise(struct mtk_iommu_domain *dom,
 		.iommu_dev = data->dev,
 	};
 
+	if (MTK_IOMMU_HAS_FLAG(data->plat_data, PGTABLE_L2_PA_35_EN))
+		dom->cfg.quirks |= IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT;
+
 	if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_4GB_MODE))
 		dom->cfg.oas = data->enable_4GB ? 33 : 32;
 	else
@@ -1038,7 +1042,8 @@ static const struct mtk_iommu_plat_data mt2712_data = {
 
 static const struct mtk_iommu_plat_data mt6779_data = {
 	.m4u_plat      = M4U_MT6779,
-	.flags         = HAS_SUB_COMM | OUT_ORDER_WR_EN | WR_THROT_EN,
+	.flags         = HAS_SUB_COMM | OUT_ORDER_WR_EN | WR_THROT_EN |
+			 PGTABLE_L2_PA_35_EN,
 	.inv_sel_reg   = REG_MMU_INV_SEL_GEN2,
 	.iova_region   = single_domain,
 	.iova_region_nr = ARRAY_SIZE(single_domain),
-- 
2.18.0