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>
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@ -63,6 +63,7 @@ struct device_state {
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int pasid_levels;
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int pasid_levels;
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int max_pasids;
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int max_pasids;
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amd_iommu_invalid_ppr_cb inv_ppr_cb;
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amd_iommu_invalid_ppr_cb inv_ppr_cb;
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amd_iommu_invalidate_ctx inv_ctx_cb;
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spinlock_t lock;
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spinlock_t lock;
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wait_queue_head_t wq;
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wait_queue_head_t wq;
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};
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};
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@ -637,6 +638,9 @@ again:
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dev_state = pasid_state->device_state;
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dev_state = pasid_state->device_state;
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pasid = pasid_state->pasid;
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pasid = pasid_state->pasid;
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if (pasid_state->device_state->inv_ctx_cb)
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dev_state->inv_ctx_cb(dev_state->pdev, pasid);
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unbind_pasid(dev_state, pasid);
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unbind_pasid(dev_state, pasid);
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/* Task may be in the list multiple times */
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/* Task may be in the list multiple times */
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@ -881,6 +885,37 @@ out_unlock:
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}
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}
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EXPORT_SYMBOL(amd_iommu_set_invalid_ppr_cb);
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EXPORT_SYMBOL(amd_iommu_set_invalid_ppr_cb);
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int amd_iommu_set_invalidate_ctx_cb(struct pci_dev *pdev,
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amd_iommu_invalidate_ctx cb)
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{
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struct device_state *dev_state;
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unsigned long flags;
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u16 devid;
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int ret;
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if (!amd_iommu_v2_supported())
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return -ENODEV;
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devid = device_id(pdev);
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spin_lock_irqsave(&state_lock, flags);
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ret = -EINVAL;
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dev_state = state_table[devid];
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if (dev_state == NULL)
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goto out_unlock;
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dev_state->inv_ctx_cb = cb;
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ret = 0;
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out_unlock:
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spin_unlock_irqrestore(&state_lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(amd_iommu_set_invalidate_ctx_cb);
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static int __init amd_iommu_v2_init(void)
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static int __init amd_iommu_v2_init(void)
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{
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{
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size_t state_table_size;
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size_t state_table_size;
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@ -145,6 +145,23 @@ struct amd_iommu_device_info {
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extern int amd_iommu_device_info(struct pci_dev *pdev,
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extern int amd_iommu_device_info(struct pci_dev *pdev,
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struct amd_iommu_device_info *info);
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struct amd_iommu_device_info *info);
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/**
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* amd_iommu_set_invalidate_ctx_cb() - Register a call-back for invalidating
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* a pasid context. This call-back is
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* invoked when the IOMMUv2 driver needs to
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* invalidate a PASID context, for example
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* because the task that is bound to that
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* context is about to exit.
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*
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* @pdev: The PCI device the call-back should be registered for
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* @cb: The call-back function
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*/
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typedef void (*amd_iommu_invalidate_ctx)(struct pci_dev *pdev, int pasid);
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extern int amd_iommu_set_invalidate_ctx_cb(struct pci_dev *pdev,
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amd_iommu_invalidate_ctx cb);
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#else
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#else
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static inline int amd_iommu_detect(void) { return -ENODEV; }
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static inline int amd_iommu_detect(void) { return -ENODEV; }
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