linux-kernel - [PATCH 1/1] Revert "iommu/arm-smmu-v3: Set TTL invalidation hint better"

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Message-ID: <1690784482-30028-1-git-send-email-wangwudi@hisilicon.com>
Date:   Mon, 31 Jul 2023 14:21:22 +0800
From:   wangwudi <wangwudi@...ilicon.com>
To:     <linux-arm-kernel@...ts.infradead.org>, <iommu@...ts.linux.dev>,
        <linux-kernel@...r.kernel.org>
CC:     Rui Zhu <zhurui3@...wei.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Yicong Yang <yangyicong@...ilicon.com>,
        Tomas Krcka <krckatom@...zon.de>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Nicolin Chen <nicolinc@...dia.com>
Subject: [PATCH 1/1] Revert "iommu/arm-smmu-v3: Set TTL invalidation hint better"

From: Rui Zhu <zhurui3@...wei.com>

This reverts commit 6833b8f2e19945a41e4d5efd8c6d9f4cae9a5b7d.

This constraint violates the protocol. When tg is not 0 but ttl, scale,
and num are 0, the hardware reports the CERROR_IL gerror. In the
protocol, leaf is not a prerequisite for TTL.

Cc: Will Deacon <will@...nel.org>
Cc: Robin Murphy <robin.murphy@....com>
Cc: Joerg Roedel <joro@...tes.org>
Cc: Lu Baolu <baolu.lu@...ux.intel.com>
Cc: Jason Gunthorpe <jgg@...pe.ca>
Cc: Yicong Yang <yangyicong@...ilicon.com>
Cc: Tomas Krcka <krckatom@...zon.de>
Cc: Jean-Philippe Brucker <jean-philippe@...aro.org>
Cc: Nicolin Chen <nicolinc@...dia.com>
Cc: Rui Zhu <zhurui3@...wei.com>

Signed-off-by: Rui Zhu <zhurui3@...wei.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 9b0dc3505601..098e84cfa82f 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -1898,13 +1898,8 @@ static void __arm_smmu_tlb_inv_range(struct arm_smmu_cmdq_ent *cmd,
 		/* Convert page size of 12,14,16 (log2) to 1,2,3 */
 		cmd->tlbi.tg = (tg - 10) / 2;
 
-		/*
-		 * Determine what level the granule is at. For non-leaf, io-pgtable
-		 * assumes .tlb_flush_walk can invalidate multiple levels at once,
-		 * so ignore the nominal last-level granule and leave TTL=0.
-		 */
-		if (cmd->tlbi.leaf)
-			cmd->tlbi.ttl = 4 - ((ilog2(granule) - 3) / (tg - 3));
+		/* Determine what level the granule is at */
+		cmd->tlbi.ttl = 4 - ((ilog2(granule) - 3) / (tg - 3));
 
 		num_pages = size >> tg;
 	}
-- 
1.8.3.1