static struct dma_map_ops amd_iommu_dma_ops;
+/*
+ * This struct contains device specific data for the IOMMU
+ */
+struct iommu_dev_data {
+ struct list_head list; /* For domain->dev_list */
+ struct list_head dev_data_list; /* For global dev_data_list */
+ struct list_head alias_list; /* Link alias-groups together */
+ struct iommu_dev_data *alias_data;/* The alias dev_data */
+ struct protection_domain *domain; /* Domain the device is bound to */
+ atomic_t bind; /* Domain attach reference count */
+ u16 devid; /* PCI Device ID */
+ bool iommu_v2; /* Device can make use of IOMMUv2 */
+ bool passthrough; /* Default for device is pt_domain */
+ struct {
+ bool enabled;
+ int qdep;
+ } ats; /* ATS state */
+ bool pri_tlp; /* PASID TLB required for
+ PPR completions */
+ u32 errata; /* Bitmap for errata to apply */
+};
+
/*
* general struct to manage commands send to an IOMMU
*/
if (!dev_data)
return NULL;
+ INIT_LIST_HEAD(&dev_data->alias_list);
+
dev_data->devid = devid;
atomic_set(&dev_data->bind, 0);
return -ENOTSUPP;
}
dev_data->alias_data = alias_data;
+
+ /* Add device to the alias_list */
+ list_add(&dev_data->alias_list, &alias_data->alias_list);
}
ret = init_iommu_group(dev);
static int __attach_device(struct iommu_dev_data *dev_data,
struct protection_domain *domain)
{
+ struct iommu_dev_data *head, *entry;
int ret;
/* lock domain */
spin_lock(&domain->lock);
- if (dev_data->alias_data != NULL) {
- struct iommu_dev_data *alias_data = dev_data->alias_data;
+ head = dev_data;
- /* Some sanity checks */
- ret = -EBUSY;
- if (alias_data->domain != NULL &&
- alias_data->domain != domain)
- goto out_unlock;
-
- if (dev_data->domain != NULL &&
- dev_data->domain != domain)
- goto out_unlock;
+ if (head->alias_data != NULL)
+ head = head->alias_data;
- /* Do real assignment */
- if (alias_data->domain == NULL)
- do_attach(alias_data, domain);
+ /* Now we have the root of the alias group, if any */
- atomic_inc(&alias_data->bind);
- }
+ ret = -EBUSY;
+ if (head->domain != NULL)
+ goto out_unlock;
- if (dev_data->domain == NULL)
- do_attach(dev_data, domain);
+ /* Attach alias group root */
+ do_attach(head, domain);
- atomic_inc(&dev_data->bind);
+ /* Attach other devices in the alias group */
+ list_for_each_entry(entry, &head->alias_list, alias_list)
+ do_attach(entry, domain);
ret = 0;
*/
static void __detach_device(struct iommu_dev_data *dev_data)
{
+ struct iommu_dev_data *head, *entry;
struct protection_domain *domain;
unsigned long flags;
spin_lock_irqsave(&domain->lock, flags);
- if (dev_data->alias_data != NULL) {
- struct iommu_dev_data *alias_data = dev_data->alias_data;
+ head = dev_data;
+ if (head->alias_data != NULL)
+ head = head->alias_data;
- if (atomic_dec_and_test(&alias_data->bind))
- do_detach(alias_data);
- }
+ list_for_each_entry(entry, &head->alias_list, alias_list)
+ do_detach(entry);
- if (atomic_dec_and_test(&dev_data->bind))
- do_detach(dev_data);
+ do_detach(head);
spin_unlock_irqrestore(&domain->lock, flags);