linux-kernel - [PATCH V3 2/2] iommu: sprd: Add support for reattaching an existing domain

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Message-ID: <20230313075017.668204-3-chunyan.zhang@unisoc.com>
Date:   Mon, 13 Mar 2023 15:50:17 +0800
From:   Chunyan Zhang <chunyan.zhang@...soc.com>
To:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        "Robin Murphy" <robin.murphy@....com>
CC:     <iommu@...ts.linux.dev>, Baolu Lu <baolu.lu@...ux.intel.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Orson Zhai <orsonzhai@...il.com>,
        "Chunyan Zhang" <zhang.lyra@...il.com>,
        Chunyan Zhang <chunyan.zhang@...soc.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH V3 2/2] iommu: sprd: Add support for reattaching an existing domain

This IOMMU driver should allow a domain to be attached more than once.

If IOMMU is reattaching to the same domain which is attached, there's
nothing to be done.

If reattching to a previously-used domain, do not alloc DMA buffer
again which stores address mapping table to avoid memory leak.

Signed-off-by: Chunyan Zhang <chunyan.zhang@...soc.com>
---
 drivers/iommu/sprd-iommu.c | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/drivers/iommu/sprd-iommu.c b/drivers/iommu/sprd-iommu.c
index 7df1f730c778..3513b2b108bf 100644
--- a/drivers/iommu/sprd-iommu.c
+++ b/drivers/iommu/sprd-iommu.c
@@ -62,6 +62,7 @@ enum sprd_iommu_version {
  * @eb: gate clock which controls IOMMU access
  */
 struct sprd_iommu_device {
+	struct sprd_iommu_domain	*dom;
 	enum sprd_iommu_version	ver;
 	u32			*prot_page_va;
 	dma_addr_t		prot_page_pa;
@@ -252,15 +253,27 @@ static int sprd_iommu_attach_device(struct iommu_domain *domain,
 	struct sprd_iommu_domain *dom = to_sprd_domain(domain);
 	size_t pgt_size = sprd_iommu_pgt_size(domain);
 
-	if (dom->sdev)
-		return -EINVAL;
+	/* The device is attached to this domain */
+	if (sdev->dom == dom)
+		return 0;
 
-	dom->pgt_va = dma_alloc_coherent(sdev->dev, pgt_size, &dom->pgt_pa, GFP_KERNEL);
-	if (!dom->pgt_va)
-		return -ENOMEM;
+	/* The first time that domain is attaching to a device */
+	if (!dom->pgt_va) {
+		dom->pgt_va = dma_alloc_coherent(sdev->dev, pgt_size, &dom->pgt_pa, GFP_KERNEL);
+		if (!dom->pgt_va)
+			return -ENOMEM;
+
+		dom->sdev = sdev;
+	}
 
-	dom->sdev = sdev;
+	sdev->dom = dom;
 
+	/*
+	 * One sprd IOMMU serves one client device only, disabled it before
+	 * configure mapping table to avoid access conflict in case other
+	 * mapping table is stored in.
+	 */
+	sprd_iommu_hw_en(sdev, false);
 	sprd_iommu_first_ppn(dom);
 	sprd_iommu_first_vpn(dom);
 	sprd_iommu_vpn_range(dom);
-- 
2.25.1