linux-kernel - [PATCH v4 6/6] dma-iommu: Pass iova len for IOVA domain init

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Date:   Wed, 14 Jul 2021 18:36:43 +0800
From:   John Garry <john.garry@...wei.com>
To:     <joro@...tes.org>, <will@...nel.org>, <robin.murphy@....com>,
        <baolu.lu@...ux.intel.com>
CC:     <iommu@...ts.linux-foundation.org>, <linuxarm@...wei.com>,
        <thierry.reding@...il.com>, <airlied@...ux.ie>, <daniel@...ll.ch>,
        <jonathanh@...dia.com>, <sakari.ailus@...ux.intel.com>,
        <bingbu.cao@...el.com>, <tian.shu.qiu@...el.com>,
        <mchehab@...nel.org>, <gregkh@...uxfoundation.org>,
        <digetx@...il.com>, <mst@...hat.com>, <jasowang@...hat.com>,
        <linux-kernel@...r.kernel.org>, <chenxiang66@...ilicon.com>,
        John Garry <john.garry@...wei.com>
Subject: [PATCH v4 6/6] dma-iommu: Pass iova len for IOVA domain init

Pass the max opt iova len to init the IOVA domain, if set.

Signed-off-by: John Garry <john.garry@...wei.com>
---
 drivers/iommu/dma-iommu.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index b540b586fe37..eee9f5f87935 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -335,6 +335,8 @@ static int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
 	struct iommu_dma_cookie *cookie = domain->iova_cookie;
 	unsigned long order, base_pfn;
 	struct iova_domain *iovad;
+	size_t max_opt_dma_size;
+	unsigned long iova_len = 0;
 
 	if (!cookie || cookie->type != IOMMU_DMA_IOVA_COOKIE)
 		return -EINVAL;
@@ -368,7 +370,16 @@ static int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
 		return 0;
 	}
 
-	init_iova_domain(iovad, 1UL << order, base_pfn, 0);
+
+	max_opt_dma_size = iommu_group_get_max_opt_dma_size(dev->iommu_group);
+	if (max_opt_dma_size) {
+		unsigned long shift = __ffs(1UL << order);
+
+		iova_len = max_opt_dma_size >> shift;
+		iova_len = roundup_pow_of_two(iova_len);
+	}
+
+	init_iova_domain(iovad, 1UL << order, base_pfn, iova_len);
 
 	if (!cookie->fq_domain && (!dev || !dev_is_untrusted(dev)) &&
 	    domain->ops->flush_iotlb_all && !iommu_get_dma_strict(domain)) {
-- 
2.26.2