iommu/amd: Add iommu support for ACPI HID devices

Current IOMMU driver make assumption that the downstream devices are PCI.
With the newly added ACPI-HID IVHD device entry support, this is no
longer true. This patch is to add dev type check and to distinguish the
pci and acpihid device code path.

Signed-off-by: Wan Zongshun <Vincent.Wan@amd.com>
Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 400867f..0df651a 100644 (file)
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -19,6 +19,7 @@
 
 #include <linux/ratelimit.h>
 #include <linux/pci.h>
+#include <linux/acpi.h>
 #include <linux/pci-ats.h>
 #include <linux/bitmap.h>
 #include <linux/slab.h>
@@ -216,13 +217,60 @@ static struct iommu_dev_data *find_dev_data(u16 devid)
        return dev_data;
 }
 
-static inline u16 get_device_id(struct device *dev)
+static inline int match_hid_uid(struct device *dev,
+                               struct acpihid_map_entry *entry)
+{
+       const char *hid, *uid;
+
+       hid = acpi_device_hid(ACPI_COMPANION(dev));
+       uid = acpi_device_uid(ACPI_COMPANION(dev));
+
+       if (!hid || !(*hid))
+               return -ENODEV;
+
+       if (!uid || !(*uid))
+               return strcmp(hid, entry->hid);
+
+       if (!(*entry->uid))
+               return strcmp(hid, entry->hid);
+
+       return (strcmp(hid, entry->hid) || strcmp(uid, entry->uid));
+}
+
+static inline u16 get_pci_device_id(struct device *dev)
 {
        struct pci_dev *pdev = to_pci_dev(dev);
 
        return PCI_DEVID(pdev->bus->number, pdev->devfn);
 }
 
+static inline int get_acpihid_device_id(struct device *dev,
+                                       struct acpihid_map_entry **entry)
+{
+       struct acpihid_map_entry *p;
+
+       list_for_each_entry(p, &acpihid_map, list) {
+               if (!match_hid_uid(dev, p)) {
+                       if (entry)
+                               *entry = p;
+                       return p->devid;
+               }
+       }
+       return -EINVAL;
+}
+
+static inline int get_device_id(struct device *dev)
+{
+       int devid;
+
+       if (dev_is_pci(dev))
+               devid = get_pci_device_id(dev);
+       else
+               devid = get_acpihid_device_id(dev, NULL);
+
+       return devid;
+}
+
 static struct iommu_dev_data *get_dev_data(struct device *dev)
 {
        return dev->archdata.iommu;
@@ -303,10 +351,6 @@ static bool check_device(struct device *dev)
        if (!dev || !dev->dma_mask)
                return false;
 
-       /* No PCI device */
-       if (!dev_is_pci(dev))
-               return false;
-
        devid = get_device_id(dev);
        if (IS_ERR_VALUE(devid))
                return false;
@@ -344,7 +388,6 @@ out:
 
 static int iommu_init_device(struct device *dev)
 {
-       struct pci_dev *pdev = to_pci_dev(dev);
        struct iommu_dev_data *dev_data;
        int devid;
 
@@ -359,10 +402,10 @@ static int iommu_init_device(struct device *dev)
        if (!dev_data)
                return -ENOMEM;
 
-       if (pci_iommuv2_capable(pdev)) {
+       if (dev_is_pci(dev) && pci_iommuv2_capable(to_pci_dev(dev))) {
                struct amd_iommu *iommu;
 
-               iommu              = amd_iommu_rlookup_table[dev_data->devid];
+               iommu = amd_iommu_rlookup_table[dev_data->devid];
                dev_data->iommu_v2 = iommu->is_iommu_v2;
        }
 
@@ -2239,13 +2282,17 @@ static bool pci_pri_tlp_required(struct pci_dev *pdev)
 static int attach_device(struct device *dev,
                         struct protection_domain *domain)
 {
-       struct pci_dev *pdev = to_pci_dev(dev);
+       struct pci_dev *pdev;
        struct iommu_dev_data *dev_data;
        unsigned long flags;
        int ret;
 
        dev_data = get_dev_data(dev);
 
+       if (!dev_is_pci(dev))
+               goto skip_ats_check;
+
+       pdev = to_pci_dev(dev);
        if (domain->flags & PD_IOMMUV2_MASK) {
                if (!dev_data->passthrough)
                        return -EINVAL;
@@ -2264,6 +2311,7 @@ static int attach_device(struct device *dev,
                dev_data->ats.qdep    = pci_ats_queue_depth(pdev);
        }
 
+skip_ats_check:
        write_lock_irqsave(&amd_iommu_devtable_lock, flags);
        ret = __attach_device(dev_data, domain);
        write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
@@ -2320,6 +2368,9 @@ static void detach_device(struct device *dev)
        __detach_device(dev_data);
        write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
 
+       if (!dev_is_pci(dev))
+               return;
+
        if (domain->flags & PD_IOMMUV2_MASK && dev_data->iommu_v2)
                pdev_iommuv2_disable(to_pci_dev(dev));
        else if (dev_data->ats.enabled)