linux-kernel - [PATCH v2 4/6] iommu: Add granule

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Date:   Thu, 19 Nov 2020 14:18:34 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Tomasz Figa <tfiga@...gle.com>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <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>,
        <jun.wen@...iatek.com>
Subject: [PATCH v2 4/6] iommu: Add granule_ignore when tlb gather

Add a granule_ignore option when tlb gather for some HW which don't care
about granule when it flush tlb.

Signed-off-by: Yong Wu <yong.wu@...iatek.com>
---
 include/linux/iommu.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 794d4085edd3..1aad32238510 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -171,6 +171,7 @@ enum iommu_dev_features {
  * @start: IOVA representing the start of the range to be flushed
  * @end: IOVA representing the end of the range to be flushed (exclusive)
  * @pgsize: The interval at which to perform the flush
+ * @granule_ignore: For tlb flushing that could be regardless of granule.
  *
  * This structure is intended to be updated by multiple calls to the
  * ->unmap() function in struct iommu_ops before eventually being passed
@@ -180,6 +181,7 @@ struct iommu_iotlb_gather {
 	unsigned long		start;
 	unsigned long		end;
 	size_t			pgsize;
+	bool			granule_ignore;
 };
 
 /**
@@ -544,7 +546,7 @@ static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
 	 * a different granularity, then sync the TLB so that the gather
 	 * structure can be rewritten.
 	 */
-	if (gather->pgsize != size ||
+	if ((!gather->granule_ignore && gather->pgsize != size) ||
 	    end < gather->start || start > gather->end) {
 		if (gather->pgsize)
 			iommu_iotlb_sync(domain, gather);
-- 
2.18.0