linux-kernel - [PATCH v5 2/7] iommu/sva: Explicitly exclude RID

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Message-Id: <20230427174937.471668-3-jacob.jun.pan@linux.intel.com>
Date:   Thu, 27 Apr 2023 10:49:32 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     LKML <linux-kernel@...r.kernel.org>, iommu@...ts.linux.dev,
        "Robin Murphy" <robin.murphy@....com>,
        Jason Gunthorpe <jgg@...dia.com>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>, dmaengine@...r.kernel.org,
        vkoul@...nel.org
Cc:     "Will Deacon" <will@...nel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Raj Ashok <ashok.raj@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>, Yi Liu <yi.l.liu@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        "Zanussi, Tom" <tom.zanussi@...el.com>,
        narayan.ranganathan@...el.com,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v5 2/7] iommu/sva: Explicitly exclude RID_PASID from SVA

SVA PASID allocation is hardcoded to start from 1 because 0 is used for
RID_PASID, let's make it explicit to avoid the potential conflicts.

Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
 drivers/iommu/iommu-sva.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/iommu-sva.c b/drivers/iommu/iommu-sva.c
index c434b95dc8eb..ac7c93bacb5c 100644
--- a/drivers/iommu/iommu-sva.c
+++ b/drivers/iommu/iommu-sva.c
@@ -66,7 +66,7 @@ struct iommu_sva *iommu_sva_bind_device(struct device *dev, struct mm_struct *mm
 		return ERR_PTR(-EOPNOTSUPP);
 
 	/* Allocate mm->pasid if necessary. */
-	ret = iommu_sva_alloc_pasid(mm, 1, max_pasids - 1);
+	ret = iommu_sva_alloc_pasid(mm, IOMMU_DEF_RID_PASID + 1, max_pasids - 1);
 	if (ret)
 		return ERR_PTR(ret);
 
-- 
2.25.1