[RFC PATCH 16/34] iommu/vt-d: Convert to probe/release_device() call-backs

From: Joerg Roedel <joro@8bytes.org>
To: Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Kukjin Kim <kgene@kernel.org>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	David Woodhouse <dwmw2@infradead.org>,
	Lu Baolu <baolu.lu@linux.intel.com>,
	Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Rob Clark <robdclark@gmail.com>, Heiko Stuebner <heiko@sntech.de>,
	Gerald Schaefer <gerald.schaefer@de.ibm.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Jonathan Hunter <jonathanh@nvidia.com>,
	Jean-Philippe Brucker <jean-philippe@linaro.org>
Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
	linux-samsung-soc@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	linux-mediatek@lists.infradead.org,
	linux-rockchip@lists.infradead.org, linux-s390@vger.kernel.org,
	linux-tegra@vger.kernel.org,
	virtualization@lists.linux-foundation.org,
	Joerg Roedel <jroedel@suse.de>
Subject: [RFC PATCH 16/34] iommu/vt-d: Convert to probe/release_device() call-backs
Date: Tue,  7 Apr 2020 20:37:24 +0200	[thread overview]
Message-ID: <20200407183742.4344-17-joro@8bytes.org> (raw)
In-Reply-To: <20200407183742.4344-1-joro@8bytes.org>

From: Joerg Roedel <jroedel@suse.de>

Convert the Intel IOMMU driver to use the probe_device() and
release_device() call-backs of iommu_ops, so that the iommu core code
does the group and sysfs setup.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
 drivers/iommu/intel-iommu.c | 67 ++++---------------------------------
 1 file changed, 6 insertions(+), 61 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index b9f905a55dda..b906727f5b85 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5781,78 +5781,27 @@ static bool intel_iommu_capable(enum iommu_cap cap)
 	return false;
 }
 
-static int intel_iommu_add_device(struct device *dev)
+static struct iommu_device *intel_iommu_probe_device(struct device *dev)
 {
-	struct dmar_domain *dmar_domain;
-	struct iommu_domain *domain;
 	struct intel_iommu *iommu;
-	struct iommu_group *group;
 	u8 bus, devfn;
-	int ret;
 
 	iommu = device_to_iommu(dev, &bus, &devfn);
 	if (!iommu)
-		return -ENODEV;
-
-	iommu_device_link(&iommu->iommu, dev);
+		return ERR_PTR(-ENODEV);
 
 	if (translation_pre_enabled(iommu))
 		dev->archdata.iommu = DEFER_DEVICE_DOMAIN_INFO;
 
-	group = iommu_group_get_for_dev(dev);
-
-	if (IS_ERR(group)) {
-		ret = PTR_ERR(group);
-		goto unlink;
-	}
-
-	iommu_group_put(group);
-
-	domain = iommu_get_domain_for_dev(dev);
-	dmar_domain = to_dmar_domain(domain);
-	if (domain->type == IOMMU_DOMAIN_DMA) {
-		if (device_def_domain_type(dev) == IOMMU_DOMAIN_IDENTITY) {
-			ret = iommu_request_dm_for_dev(dev);
-			if (ret) {
-				dmar_remove_one_dev_info(dev);
-				dmar_domain->flags |= DOMAIN_FLAG_LOSE_CHILDREN;
-				domain_add_dev_info(si_domain, dev);
-				dev_info(dev,
-					 "Device uses a private identity domain.\n");
-			}
-		}
-	} else {
-		if (device_def_domain_type(dev) == IOMMU_DOMAIN_DMA) {
-			ret = iommu_request_dma_domain_for_dev(dev);
-			if (ret) {
-				dmar_remove_one_dev_info(dev);
-				dmar_domain->flags |= DOMAIN_FLAG_LOSE_CHILDREN;
-				if (!get_private_domain_for_dev(dev)) {
-					dev_warn(dev,
-						 "Failed to get a private domain.\n");
-					ret = -ENOMEM;
-					goto unlink;
-				}
-
-				dev_info(dev,
-					 "Device uses a private dma domain.\n");
-			}
-		}
-	}
-
 	if (device_needs_bounce(dev)) {
 		dev_info(dev, "Use Intel IOMMU bounce page dma_ops\n");
 		set_dma_ops(dev, &bounce_dma_ops);
 	}
 
-	return 0;
-
-unlink:
-	iommu_device_unlink(&iommu->iommu, dev);
-	return ret;
+	return &iommu->iommu;
 }
 
-static void intel_iommu_remove_device(struct device *dev)
+static void intel_iommu_release_device(struct device *dev)
 {
 	struct intel_iommu *iommu;
 	u8 bus, devfn;
@@ -5863,10 +5812,6 @@ static void intel_iommu_remove_device(struct device *dev)
 
 	dmar_remove_one_dev_info(dev);
 
-	iommu_group_remove_device(dev);
-
-	iommu_device_unlink(&iommu->iommu, dev);
-
 	if (device_needs_bounce(dev))
 		set_dma_ops(dev, NULL);
 }
@@ -6198,8 +6143,8 @@ const struct iommu_ops intel_iommu_ops = {
 	.map			= intel_iommu_map,
 	.unmap			= intel_iommu_unmap,
 	.iova_to_phys		= intel_iommu_iova_to_phys,
-	.add_device		= intel_iommu_add_device,
-	.remove_device		= intel_iommu_remove_device,
+	.probe_device		= intel_iommu_probe_device,
+	.release_device		= intel_iommu_release_device,
 	.get_resv_regions	= intel_iommu_get_resv_regions,
 	.put_resv_regions	= generic_iommu_put_resv_regions,
 	.apply_resv_region	= intel_iommu_apply_resv_region,
-- 
2.17.1

