[PATCH v1 01/37] iommu/amd: Update struct iommu_dev_data defination

[Vasant Hegde via iommu <iommu@lists.linux-foundation.org>]

struct iommu_dev_data contains member "pdev" to point to pci_dev. This is
valid for only PCI devices and for other devices this will be NULL. This
causes unnecessary "pdev != NULL" check at various places.

Replace "struct pci_dev" member with "struct device" and use
to_pci_dev() to get pci device reference as needed. Also adjust
setup_aliases() and clone_aliases() function.

No functional change intended.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
---
 drivers/iommu/amd/amd_iommu_types.h |  2 +-
 drivers/iommu/amd/iommu.c           | 27 +++++++++++++++------------
 2 files changed, 16 insertions(+), 13 deletions(-)

diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h
index 47108ed44fbb..06235b7cb13d 100644
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -685,7 +685,7 @@ struct iommu_dev_data {
 	struct list_head list;		  /* For domain->dev_list */
 	struct llist_node dev_data_list;  /* For global dev_data_list */
 	struct protection_domain *domain; /* Domain the device is bound to */
-	struct pci_dev *pdev;
+	struct device *dev;
 	u16 devid;			  /* PCI Device ID */
 	bool iommu_v2;			  /* Device can make use of IOMMUv2 */
 	struct {
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index a1ada7bff44e..7a29e2645dc4 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -188,8 +188,10 @@ static int clone_alias(struct pci_dev *pdev, u16 alias, void *data)
 	return 0;
 }
 
-static void clone_aliases(struct pci_dev *pdev)
+static void clone_aliases(struct device *dev)
 {
+	struct pci_dev *pdev = to_pci_dev(dev);
+
 	if (!pdev)
 		return;
 
@@ -203,14 +205,14 @@ static void clone_aliases(struct pci_dev *pdev)
 	pci_for_each_dma_alias(pdev, clone_alias, NULL);
 }
 
-static struct pci_dev *setup_aliases(struct device *dev)
+static void setup_aliases(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	u16 ivrs_alias;
 
 	/* For ACPI HID devices, there are no aliases */
 	if (!dev_is_pci(dev))
-		return NULL;
+		return;
 
 	/*
 	 * Add the IVRS alias to the pci aliases if it is on the same
@@ -221,9 +223,7 @@ static struct pci_dev *setup_aliases(struct device *dev)
 	    PCI_BUS_NUM(ivrs_alias) == pdev->bus->number)
 		pci_add_dma_alias(pdev, ivrs_alias & 0xff, 1);
 
-	clone_aliases(pdev);
-
-	return pdev;
+	clone_aliases(dev);
 }
 
 static struct iommu_dev_data *find_dev_data(u16 devid)
@@ -331,7 +331,8 @@ static int iommu_init_device(struct device *dev)
 	if (!dev_data)
 		return -ENOMEM;
 
-	dev_data->pdev = setup_aliases(dev);
+	dev_data->dev = dev;
+	setup_aliases(dev);
 
 	/*
 	 * By default we use passthrough mode for IOMMUv2 capable device.
@@ -1232,13 +1233,15 @@ static int device_flush_dte_alias(struct pci_dev *pdev, u16 alias, void *data)
 static int device_flush_dte(struct iommu_dev_data *dev_data)
 {
 	struct amd_iommu *iommu;
+	struct pci_dev *pdev;
 	u16 alias;
 	int ret;
 
 	iommu = amd_iommu_rlookup_table[dev_data->devid];
 
-	if (dev_data->pdev)
-		ret = pci_for_each_dma_alias(dev_data->pdev,
+	pdev = to_pci_dev(dev_data->dev);
+	if (pdev)
+		ret = pci_for_each_dma_alias(pdev,
 					     device_flush_dte_alias, iommu);
 	else
 		ret = iommu_flush_dte(iommu, dev_data->devid);
@@ -1561,7 +1564,7 @@ static void do_attach(struct iommu_dev_data *dev_data,
 	/* Update device table */
 	set_dte_entry(dev_data->devid, domain,
 		      ats, dev_data->iommu_v2);
-	clone_aliases(dev_data->pdev);
+	clone_aliases(dev_data->dev);
 
 	device_flush_dte(dev_data);
 }
@@ -1577,7 +1580,7 @@ static void do_detach(struct iommu_dev_data *dev_data)
 	dev_data->domain = NULL;
 	list_del(&dev_data->list);
 	clear_dte_entry(dev_data->devid);
-	clone_aliases(dev_data->pdev);
+	clone_aliases(dev_data->dev);
 
 	/* Flush the DTE entry */
 	device_flush_dte(dev_data);
@@ -1818,7 +1821,7 @@ static void update_device_table(struct protection_domain *domain)
 	list_for_each_entry(dev_data, &domain->dev_list, list) {
 		set_dte_entry(dev_data->devid, domain,
 			      dev_data->ats.enabled, dev_data->iommu_v2);
-		clone_aliases(dev_data->pdev);
+		clone_aliases(dev_data->dev);
 	}
 }
 
-- 
2.27.0

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