iommu/amd: Update struct iommu_dev_data definition

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.

Co-developed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Link: https://lore.kernel.org/r/20220706113825.25582-2-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h
index 72d0f5e..9b563f8 100644 (file)
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -689,7 +689,7 @@ 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 840831d..efa8af5 100644 (file)
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -188,10 +188,13 @@ 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)
 {
-       if (!pdev)
+       struct pci_dev *pdev;
+
+       if (!dev_is_pci(dev))
                return;
+       pdev = to_pci_dev(dev);
 
        /*
         * The IVRS alias stored in the alias table may not be
@@ -203,14 +206,14 @@ 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 +224,7 @@ 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 +332,8 @@ 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 +1234,17 @@ 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 = NULL;
        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,
+       if (dev_is_pci(dev_data->dev))
+               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 +1567,7 @@ 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 +1583,7 @@ 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 +1824,7 @@ 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);
        }
 }