iommu/amd: Add invalidate-context call-back
This call-back is invoked when the task that is bound to a
pasid is about to exit. The driver can use it to shutdown
all context related to that context in a safe way.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c
index fe812e2..8add9f1 100644
--- a/drivers/iommu/amd_iommu_v2.c
+++ b/drivers/iommu/amd_iommu_v2.c
@@ -63,6 +63,7 @@
int pasid_levels;
int max_pasids;
amd_iommu_invalid_ppr_cb inv_ppr_cb;
+ amd_iommu_invalidate_ctx inv_ctx_cb;
spinlock_t lock;
wait_queue_head_t wq;
};
@@ -637,6 +638,9 @@
dev_state = pasid_state->device_state;
pasid = pasid_state->pasid;
+ if (pasid_state->device_state->inv_ctx_cb)
+ dev_state->inv_ctx_cb(dev_state->pdev, pasid);
+
unbind_pasid(dev_state, pasid);
/* Task may be in the list multiple times */
@@ -881,6 +885,37 @@
}
EXPORT_SYMBOL(amd_iommu_set_invalid_ppr_cb);
+int amd_iommu_set_invalidate_ctx_cb(struct pci_dev *pdev,
+ amd_iommu_invalidate_ctx cb)
+{
+ struct device_state *dev_state;
+ unsigned long flags;
+ u16 devid;
+ int ret;
+
+ if (!amd_iommu_v2_supported())
+ return -ENODEV;
+
+ devid = device_id(pdev);
+
+ spin_lock_irqsave(&state_lock, flags);
+
+ ret = -EINVAL;
+ dev_state = state_table[devid];
+ if (dev_state == NULL)
+ goto out_unlock;
+
+ dev_state->inv_ctx_cb = cb;
+
+ ret = 0;
+
+out_unlock:
+ spin_unlock_irqrestore(&state_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(amd_iommu_set_invalidate_ctx_cb);
+
static int __init amd_iommu_v2_init(void)
{
size_t state_table_size;