iommu/vt-d: Fix bind svm with multiple devices (d7af4d98) · Commits · e / devices / android_kernel_fairphone_FP5

If multiple devices try to bind to the same mm/PASID, we need to set up first level PASID entries for all the devices. The current code does not consider this case which results in failed DMA for devices after the first bind. Signed-off-by:

Jacob Pan <jacob.jun.pan@linux.intel.com> Reported-by:

Mike Campin <mike.campin@intel.com> Signed-off-by:

Joerg Roedel <jroedel@suse.de>

drivers/iommu/intel-svm.c

+15 −0

Original line number	Diff line number	Diff line
		@@ -374,6 +374,21 @@ int intel_svm_bind_mm(struct device dev, int pasid, int flags, struct svm_dev_
		}

		list_add_tail(&svm->list, &global_svm_list);
		} else {
		/*
		* Binding a new device with existing PASID, need to setup
		* the PASID entry.
		*/
		spin_lock(&iommu->lock);
		ret = intel_pasid_setup_first_level(iommu, dev,
		mm ? mm->pgd : init_mm.pgd,
		svm->pasid, FLPT_DEFAULT_DID,
		mm ? 0 : PASID_FLAG_SUPERVISOR_MODE);
		spin_unlock(&iommu->lock);
		if (ret) {
		kfree(sdev);
		goto out;
		}
		}
		list_add_rcu(&sdev->list, &svm->devs);