From: Yong Wu <yong.wu@mediatek.com>
To: Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
"Robin Murphy" <robin.murphy@arm.com>
Cc: youlin.pei@mediatek.com, anan.sun@mediatek.com,
Nicolas Boichat <drinkcat@chromium.org>,
srv_heupstream@mediatek.com, chao.hao@mediatek.com,
linux-kernel@vger.kernel.org,
Krzysztof Kozlowski <krzk@kernel.org>,
Christoph Hellwig <hch@infradead.org>,
Tomasz Figa <tfiga@google.com>,
iommu@lists.linux-foundation.org,
David Laight <David.Laight@ACULAB.COM>,
linux-mediatek@lists.infradead.org, yong.wu@mediatek.com,
Matthias Brugger <matthias.bgg@gmail.com>,
Greg Kroah-Hartman <gregkh@google.com>,
kernel-team@android.com, linux-arm-kernel@lists.infradead.org
Subject: [PATCH v4 6/7] iommu/mediatek: Gather iova in iommu_unmap to achieve tlb sync once
Date: Thu, 7 Jan 2021 20:29:08 +0800 [thread overview]
Message-ID: <20210107122909.16317-7-yong.wu@mediatek.com> (raw)
In-Reply-To: <20210107122909.16317-1-yong.wu@mediatek.com>
In current iommu_unmap, this code is:
iommu_iotlb_gather_init(&iotlb_gather);
ret = __iommu_unmap(domain, iova, size, &iotlb_gather);
iommu_iotlb_sync(domain, &iotlb_gather);
We could gather the whole iova range in __iommu_unmap, and then do tlb
synchronization in the iommu_iotlb_sync.
This patch implement this, Gather the range in mtk_iommu_unmap.
then iommu_iotlb_sync call tlb synchronization for the gathered iova range.
we don't call iommu_iotlb_gather_add_page since our tlb synchronization
could be regardless of granule size.
In this way, gather->start is impossible ULONG_MAX, remove the checking.
This patch aims to do tlb synchronization *once* in the iommu_unmap.
Signed-off-by: Yong Wu <yong.wu@mediatek.com>
---
drivers/iommu/mtk_iommu.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 66a00a2cb445..d3b8a1649093 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -430,7 +430,12 @@ static size_t mtk_iommu_unmap(struct iommu_domain *domain,
struct iommu_iotlb_gather *gather)
{
struct mtk_iommu_domain *dom = to_mtk_domain(domain);
+ unsigned long end = iova + size - 1;
+ if (gather->start > iova)
+ gather->start = iova;
+ if (gather->end < end)
+ gather->end = end;
return dom->iop->unmap(dom->iop, iova, size, gather);
}
@@ -445,9 +450,6 @@ 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 + 1;
- if (gather->start == ULONG_MAX)
- return;
-
mtk_iommu_tlb_flush_range_sync(gather->start, length, gather->pgsize,
data);
}
--
2.18.0
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next prev parent reply other threads:[~2021-01-07 12:54 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-07 12:29 [PATCH v4 0/7] MediaTek IOMMU improve tlb flush performance in map/unmap Yong Wu
2021-01-07 12:29 ` [PATCH v4 1/7] iommu: Move iotlb_sync_map out from __iommu_map Yong Wu
2021-02-02 1:07 ` Doug Anderson
2021-01-07 12:29 ` [PATCH v4 2/7] iommu: Add iova and size as parameters in iotlb_sync_map Yong Wu
2021-01-07 12:29 ` [PATCH v4 3/7] iommu/mediatek: Add iotlb_sync_map to sync whole the iova range Yong Wu
2021-01-07 12:29 ` [PATCH v4 4/7] iommu: Switch gather->end to the inclusive end Yong Wu
2021-01-18 18:41 ` Robin Murphy
2021-01-07 12:29 ` [PATCH v4 5/7] iommu/io-pgtable: Allow io_pgtable_tlb ops optional Yong Wu
2021-01-18 18:42 ` Robin Murphy
2021-01-07 12:29 ` Yong Wu [this message]
2021-01-18 18:44 ` [PATCH v4 6/7] iommu/mediatek: Gather iova in iommu_unmap to achieve tlb sync once Robin Murphy
2021-01-07 12:29 ` [PATCH v4 7/7] iommu/mediatek: Remove the tlb-ops for v7s Yong Wu
2021-01-18 18:46 ` Robin Murphy
2021-01-22 19:32 ` [PATCH v4 0/7] MediaTek IOMMU improve tlb flush performance in map/unmap Will Deacon
2021-01-27 13:19 ` Will Deacon
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