x86/amd-iommu: Introduce global dev_data_list
This list keeps all allocated iommu_dev_data structs in a
list together. This is needed for instances that have no
associated device.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index cc6f6da6..8b84890 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -45,6 +45,10 @@
static LIST_HEAD(iommu_pd_list);
static DEFINE_SPINLOCK(iommu_pd_list_lock);
+/* List of all available dev_data structures */
+static LIST_HEAD(dev_data_list);
+static DEFINE_SPINLOCK(dev_data_list_lock);
+
/*
* Domain for untranslated devices - only allocated
* if iommu=pt passed on kernel cmd line.
@@ -68,6 +72,35 @@
*
****************************************************************************/
+static struct iommu_dev_data *alloc_dev_data(void)
+{
+ struct iommu_dev_data *dev_data;
+ unsigned long flags;
+
+ dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL);
+ if (!dev_data)
+ return NULL;
+
+ atomic_set(&dev_data->bind, 0);
+
+ spin_lock_irqsave(&dev_data_list_lock, flags);
+ list_add_tail(&dev_data->dev_data_list, &dev_data_list);
+ spin_unlock_irqrestore(&dev_data_list_lock, flags);
+
+ return dev_data;
+}
+
+static void free_dev_data(struct iommu_dev_data *dev_data)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev_data_list_lock, flags);
+ list_del(&dev_data->dev_data_list);
+ spin_unlock_irqrestore(&dev_data_list_lock, flags);
+
+ kfree(dev_data);
+}
+
static inline u16 get_device_id(struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
@@ -139,32 +172,28 @@
{
struct iommu_dev_data *dev_data;
struct pci_dev *pdev;
- u16 devid, alias;
+ u16 alias;
if (dev->archdata.iommu)
return 0;
- dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL);
+ dev_data = alloc_dev_data();
if (!dev_data)
return -ENOMEM;
dev_data->dev = dev;
- devid = get_device_id(dev);
- alias = amd_iommu_alias_table[devid];
+ alias = amd_iommu_alias_table[get_device_id(dev)];
pdev = pci_get_bus_and_slot(PCI_BUS(alias), alias & 0xff);
if (pdev)
dev_data->alias = &pdev->dev;
else {
- kfree(dev_data);
+ free_dev_data(dev_data);
return -ENOTSUPP;
}
- atomic_set(&dev_data->bind, 0);
-
dev->archdata.iommu = dev_data;
-
return 0;
}
@@ -184,11 +213,16 @@
static void iommu_uninit_device(struct device *dev)
{
- kfree(dev->archdata.iommu);
+ /*
+ * Nothing to do here - 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.
+ */
}
void __init amd_iommu_uninit_devices(void)
{
+ struct iommu_dev_data *dev_data, *n;
struct pci_dev *pdev = NULL;
for_each_pci_dev(pdev) {
@@ -198,6 +232,10 @@
iommu_uninit_device(&pdev->dev);
}
+
+ /* Free all of our dev_data structures */
+ list_for_each_entry_safe(dev_data, n, &dev_data_list, dev_data_list)
+ free_dev_data(dev_data);
}
int __init amd_iommu_init_devices(void)