[RFC PATCH 15/34] iommu/amd: Convert to probe/release_device() call-backs

[Joerg Roedel <joro@xxxxxxxxxx>]

From: Joerg Roedel <jroedel@xxxxxxx>

Convert the AMD 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@xxxxxxx>
---
 drivers/iommu/amd_iommu.c | 71 ++++++++++++---------------------------
 1 file changed, 22 insertions(+), 49 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 0b4b4faa876d..c30367413683 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -343,21 +343,9 @@ static bool check_device(struct device *dev)
 	return true;
 }
 
-static void init_iommu_group(struct device *dev)
-{
-	struct iommu_group *group;
-
-	group = iommu_group_get_for_dev(dev);
-	if (IS_ERR(group))
-		return;
-
-	iommu_group_put(group);
-}
-
 static int iommu_init_device(struct device *dev)
 {
 	struct iommu_dev_data *dev_data;
-	struct amd_iommu *iommu;
 	int devid;
 
 	if (dev->archdata.iommu)
@@ -367,8 +355,6 @@ static int iommu_init_device(struct device *dev)
 	if (devid < 0)
 		return devid;
 
-	iommu = amd_iommu_rlookup_table[devid];
-
 	dev_data = find_dev_data(devid);
 	if (!dev_data)
 		return -ENOMEM;
@@ -391,8 +377,6 @@ static int iommu_init_device(struct device *dev)
 
 	dev->archdata.iommu = dev_data;
 
-	iommu_device_link(&iommu->iommu, dev);
-
 	return 0;
 }
 
@@ -410,7 +394,7 @@ static void iommu_ignore_device(struct device *dev)
 	setup_aliases(dev);
 }
 
-static void iommu_uninit_device(struct device *dev)
+static void amd_iommu_uninit_device(struct device *dev)
 {
 	struct iommu_dev_data *dev_data;
 	struct amd_iommu *iommu;
@@ -429,13 +413,6 @@ static void iommu_uninit_device(struct device *dev)
 	if (dev_data->domain)
 		detach_device(dev);
 
-	iommu_device_unlink(&iommu->iommu, dev);
-
-	iommu_group_remove_device(dev);
-
-	/* Remove dma-ops */
-	dev->dma_ops = NULL;
-
 	/*
 	 * We keep dev_data around for unplugged devices and reuse it when the
 	 * device is re-plugged - not doing so would introduce a ton of races.
@@ -2152,55 +2129,50 @@ static void detach_device(struct device *dev)
 	spin_unlock_irqrestore(&domain->lock, flags);
 }
 
-static int amd_iommu_add_device(struct device *dev)
+static struct iommu_device *amd_iommu_probe_device(struct device *dev)
 {
-	struct iommu_dev_data *dev_data;
-	struct iommu_domain *domain;
+	struct iommu_device *iommu_dev;
 	struct amd_iommu *iommu;
 	int ret, devid;
 
-	if (get_dev_data(dev))
-		return 0;
-
 	if (!check_device(dev))
-		return -ENODEV;
+		return ERR_PTR(-ENODEV);
 
 	devid = get_device_id(dev);
 	if (devid < 0)
-		return devid;
+		return ERR_PTR(devid);
 
 	iommu = amd_iommu_rlookup_table[devid];
 
+	if (get_dev_data(dev))
+		return &iommu->iommu;
+
 	ret = iommu_init_device(dev);
 	if (ret) {
 		if (ret != -ENOTSUPP)
 			dev_err(dev, "Failed to initialize - trying to proceed anyway\n");
-
+		iommu_dev = ERR_PTR(ret);
 		iommu_ignore_device(dev);
-		dev->dma_ops = NULL;
-		goto out;
+	} else {
+		iommu_dev = &iommu->iommu;
 	}
-	init_iommu_group(dev);
 
-	dev_data = get_dev_data(dev);
+	iommu_completion_wait(iommu);
 
-	BUG_ON(!dev_data);
+	return iommu_dev;
+}
 
-	if (dev_data->iommu_v2)
-		iommu_request_dm_for_dev(dev);
+static void amd_iommu_probe_finalize(struct device *dev)
+{
+	struct iommu_domain *domain;
 
 	/* Domains are initialized for this device - have a look what we ended up with */
 	domain = iommu_get_domain_for_dev(dev);
 	if (domain->type == IOMMU_DOMAIN_DMA)
 		iommu_setup_dma_ops(dev, IOVA_START_PFN << PAGE_SHIFT, 0);
-
-out:
-	iommu_completion_wait(iommu);
-
-	return 0;
 }
 
-static void amd_iommu_remove_device(struct device *dev)
+static void amd_iommu_release_device(struct device *dev)
 {
 	struct amd_iommu *iommu;
 	int devid;
@@ -2214,7 +2186,7 @@ static void amd_iommu_remove_device(struct device *dev)
 
 	iommu = amd_iommu_rlookup_table[devid];
 
-	iommu_uninit_device(dev);
+	amd_iommu_uninit_device(dev);
 	iommu_completion_wait(iommu);
 }
 
@@ -2687,8 +2659,9 @@ const struct iommu_ops amd_iommu_ops = {
 	.map = amd_iommu_map,
 	.unmap = amd_iommu_unmap,
 	.iova_to_phys = amd_iommu_iova_to_phys,
-	.add_device = amd_iommu_add_device,
-	.remove_device = amd_iommu_remove_device,
+	.probe_device = amd_iommu_probe_device,
+	.release_device = amd_iommu_release_device,
+	.probe_finalize = amd_iommu_probe_finalize,
 	.device_group = amd_iommu_device_group,
 	.domain_get_attr = amd_iommu_domain_get_attr,
 	.get_resv_regions = amd_iommu_get_resv_regions,
-- 
2.17.1