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iommu/amd: Add invalidate-context call-back

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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>
This commit is contained in:
Joerg Roedel
2011-12-07 12:24:42 +01:00
parent 52efdb89d6
commit bc21662f72
2 changed files with 52 additions and 0 deletions
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drivers/iommu/amd_iommu_v2.c
+35
View File
@@ -63,6 +63,7 @@ struct device_state {
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 @@ again:
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 @@ out_unlock:
}
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;