linux-hardening - [PATCH 10/30] iommu/sprd: Move to iommu_of_get_single

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Date: Wed, 29 Nov 2023 21:10:17 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: acpica-devel@...ts.linux.dev,
	Andy Gross <agross@...nel.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>,
	Bjorn Andersson <andersson@...nel.org>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	asahi@...ts.linux.dev,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	devicetree@...r.kernel.org,
	Frank Rowand <frowand.list@...il.com>,
	Hanjun Guo <guohanjun@...wei.com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	iommu@...ts.linux.dev,
	Jean-Philippe Brucker <jean-philippe@...aro.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Joerg Roedel <joro@...tes.org>,
	Kees Cook <keescook@...omium.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	Len Brown <lenb@...nel.org>,
	linux-acpi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org,
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	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Hector Martin <marcan@...can.st>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Orson Zhai <orsonzhai@...il.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Rob Clark <robdclark@...il.com>,
	Robert Moore <robert.moore@...el.com>,
	Rob Herring <robh+dt@...nel.org>,
	Robin Murphy <robin.murphy@....com>,
	Samuel Holland <samuel@...lland.org>,
	Sudeep Holla <sudeep.holla@....com>,
	Sven Peter <sven@...npeter.dev>,
	Thierry Reding <thierry.reding@...il.com>,
	Krishna Reddy <vdumpa@...dia.com>,
	virtualization@...ts.linux.dev,
	Chen-Yu Tsai <wens@...e.org>,
	Will Deacon <will@...nel.org>,
	Yong Wu <yong.wu@...iatek.com>,
	Chunyan Zhang <zhang.lyra@...il.com>
Cc: André Draszik <andre.draszik@...aro.org>,
	patches@...ts.linux.dev
Subject: [PATCH 10/30] iommu/sprd: Move to iommu_of_get_single_iommu()

sprd suports a single iommu instance and only a single id. Parse it
directly using iommu_of_get_single_iommu() and remove
sprd_iommu_of_xlate().

It stores the iommu, not a per-driver struct in the dev_iommu_priv(), keep
it that way for now.

Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
---
 drivers/iommu/sprd-iommu.c | 32 ++++++++++++++------------------
 1 file changed, 14 insertions(+), 18 deletions(-)

diff --git a/drivers/iommu/sprd-iommu.c b/drivers/iommu/sprd-iommu.c
index 537359f109979b..f1b87f8661e199 100644
--- a/drivers/iommu/sprd-iommu.c
+++ b/drivers/iommu/sprd-iommu.c
@@ -11,6 +11,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/errno.h>
 #include <linux/iommu.h>
+#include <linux/iommu-driver.h>
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/of_platform.h>
@@ -383,32 +384,27 @@ static phys_addr_t sprd_iommu_iova_to_phys(struct iommu_domain *domain,
 	return pa;
 }
 
-static struct iommu_device *sprd_iommu_probe_device(struct device *dev)
+static struct iommu_device *sprd_iommu_probe_device(struct iommu_probe_info *pinf)
 {
-	struct sprd_iommu_device *sdev = dev_iommu_priv_get(dev);
+	struct sprd_iommu_device *sdev;
+
+	sdev = iommu_of_get_single_iommu(pinf, &sprd_iommu_ops, -1,
+					 struct sprd_iommu_device, iommu);
+	if (IS_ERR(sdev))
+		return ERR_CAST(sdev);
+	if (iommu_of_num_ids(pinf) != 1)
+		return ERR_PTR(-EINVAL);
+
+	dev_iommu_priv_set(pinf->dev, sdev);
 
 	return &sdev->iommu;
 }
 
-static int sprd_iommu_of_xlate(struct device *dev, struct of_phandle_args *args)
-{
-	struct platform_device *pdev;
-
-	if (!dev_iommu_priv_get(dev)) {
-		pdev = of_find_device_by_node(args->np);
-		dev_iommu_priv_set(dev, platform_get_drvdata(pdev));
-		platform_device_put(pdev);
-	}
-
-	return 0;
-}
-
-
 static const struct iommu_ops sprd_iommu_ops = {
 	.domain_alloc_paging = sprd_iommu_domain_alloc_paging,
-	.probe_device	= sprd_iommu_probe_device,
+	.probe_device_pinf = sprd_iommu_probe_device,
 	.device_group	= generic_single_device_group,
-	.of_xlate	= sprd_iommu_of_xlate,
+	.of_xlate = iommu_dummy_of_xlate,
 	.pgsize_bitmap	= SPRD_IOMMU_PAGE_SIZE,
 	.owner		= THIS_MODULE,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
-- 
2.42.0