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iommu/vt-d: Add callback to device driver on page faults
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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a222a7f0bb
commit
0204a49609
@ -264,7 +264,7 @@ static const struct mmu_notifier_ops intel_mmuops = {
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static DEFINE_MUTEX(pasid_mutex);
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int intel_svm_bind_mm(struct device *dev, int *pasid)
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int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_ops *ops)
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{
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struct intel_iommu *iommu = intel_svm_device_to_iommu(dev);
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struct intel_svm_dev *sdev;
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@ -302,6 +302,10 @@ int intel_svm_bind_mm(struct device *dev, int *pasid)
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list_for_each_entry(sdev, &svm->devs, list) {
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if (dev == sdev->dev) {
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if (sdev->ops != ops) {
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ret = -EBUSY;
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goto out;
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}
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sdev->users++;
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goto success;
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}
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@ -327,6 +331,7 @@ int intel_svm_bind_mm(struct device *dev, int *pasid)
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}
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/* Finish the setup now we know we're keeping it */
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sdev->users = 1;
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sdev->ops = ops;
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init_rcu_head(&sdev->rcu);
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if (!svm) {
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@ -456,6 +461,7 @@ static irqreturn_t prq_event_thread(int irq, void *d)
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tail = dmar_readq(iommu->reg + DMAR_PQT_REG) & PRQ_RING_MASK;
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head = dmar_readq(iommu->reg + DMAR_PQH_REG) & PRQ_RING_MASK;
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while (head != tail) {
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struct intel_svm_dev *sdev;
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struct vm_area_struct *vma;
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struct page_req_dsc *req;
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struct qi_desc resp;
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@ -507,6 +513,24 @@ static irqreturn_t prq_event_thread(int irq, void *d)
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up_read(&svm->mm->mmap_sem);
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bad_req:
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/* Accounting for major/minor faults? */
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rcu_read_lock();
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list_for_each_entry_rcu(sdev, &svm->devs, list) {
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if (sdev->sid == PCI_DEVID(req->bus, req->devfn));
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break;
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}
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/* Other devices can go away, but the drivers are not permitted
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* to unbind while any page faults might be in flight. So it's
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* OK to drop the 'lock' here now we have it. */
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rcu_read_unlock();
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if (WARN_ON(&sdev->list == &svm->devs))
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sdev = NULL;
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if (sdev && sdev->ops && sdev->ops->fault_cb) {
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int rwxp = (req->rd_req << 3) | (req->wr_req << 2) |
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(req->wr_req << 1) | (req->exe_req);
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sdev->ops->fault_cb(sdev->dev, req->pasid, req->addr, req->private, rwxp, result);
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}
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if (req->lpig) {
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/* Page Group Response */
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@ -472,10 +472,13 @@ extern int intel_svm_free_pasid_tables(struct intel_iommu *iommu);
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extern int intel_svm_enable_prq(struct intel_iommu *iommu);
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extern int intel_svm_finish_prq(struct intel_iommu *iommu);
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struct svm_dev_ops;
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struct intel_svm_dev {
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struct list_head list;
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struct rcu_head rcu;
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struct device *dev;
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struct svm_dev_ops *ops;
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int users;
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u16 did;
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u16 dev_iotlb:1;
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@ -20,10 +20,23 @@
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struct device;
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struct svm_dev_ops {
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void (*fault_cb)(struct device *dev, int pasid, u64 address,
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u32 private, int rwxp, int response);
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};
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/* Values for rxwp in fault_cb callback */
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#define SVM_REQ_READ (1<<3)
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#define SVM_REQ_WRITE (1<<2)
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#define SVM_REQ_EXEC (1<<1)
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#define SVM_REQ_PRIV (1<<0)
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/**
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* intel_svm_bind_mm() - Bind the current process to a PASID
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* @dev: Device to be granted acccess
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* @pasid: Address for allocated PASID
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* @flags: Flags. Later for requesting supervisor mode, etc.
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* @ops: Callbacks to device driver
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*
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* This function attempts to enable PASID support for the given device.
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* If the @pasid argument is non-%NULL, a PASID is allocated for access
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@ -45,7 +58,8 @@ struct device;
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* Multiple calls from the same process may result in the same PASID
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* being re-used. A reference count is kept.
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*/
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extern int intel_svm_bind_mm(struct device *dev, int *pasid);
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extern int intel_svm_bind_mm(struct device *dev, int *pasid, int flags,
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struct svm_dev_ops *ops);
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/**
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* intel_svm_unbind_mm() - Unbind a specified PASID
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@ -66,7 +80,8 @@ extern int intel_svm_unbind_mm(struct device *dev, int pasid);
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#else /* CONFIG_INTEL_IOMMU_SVM */
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static inline int intel_svm_bind_mm(struct device *dev, int *pasid)
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static inline int intel_svm_bind_mm(struct device *dev, int *pasid,
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int flags, struct svm_dev_ops *ops)
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{
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return -ENOSYS;
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}
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@ -77,6 +92,6 @@ static inline int intel_svm_unbind_mm(struct device *dev, int pasid)
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}
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#endif /* CONFIG_INTEL_IOMMU_SVM */
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#define intel_svm_available(dev) (!intel_svm_bind_mm((dev), NULL))
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#define intel_svm_available(dev) (!intel_svm_bind_mm((dev), NULL, 0, NULL))
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#endif /* __INTEL_SVM_H__ */
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