Re: [PATCH v3 12/15] iommufd: Add kAPI toward external drivers for physical devices

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On 2022/10/26 2:12, Jason Gunthorpe wrote:
+/*
+ * When automatically managing the domains we search for a compatible domain in
+ * the iopt and if one is found use it, otherwise create a new domain.
+ * Automatic domain selection will never pick a manually created domain.
+ */
+static int iommufd_device_auto_get_domain(struct iommufd_device *idev,
+					  struct iommufd_ioas *ioas,
+					  unsigned int flags)
+{
+	struct iommufd_hw_pagetable *hwpt;
+	int rc;
+
+	/*
+	 * There is no differentiation when domains are allocated, so any domain
+	 * that is willing to attach to the device is interchangeable with any
+	 * other.
+	 */
+	mutex_lock(&ioas->mutex);
+	list_for_each_entry(hwpt, &ioas->hwpt_list, hwpt_item) {
+		if (!hwpt->auto_domain ||
+		    !refcount_inc_not_zero(&hwpt->obj.users))
+			continue;
+
+		rc = iommufd_device_do_attach(idev, hwpt, flags);
+		refcount_dec(&hwpt->obj.users);
+		if (rc) {
+			/*
+			 * FIXME: Requires the series to return EINVAL for
+			 * incompatible domain attaches.
+			 */
+			if (rc == -EINVAL)
+				continue;
+			goto out_unlock;
+		}
+		goto out_unlock;

Can the above code be simplified as:

		if (rc == -EINVAL)
			continue;
		goto out_unlock;
?

+	}
+
+	hwpt = iommufd_hw_pagetable_alloc(idev->ictx, ioas, idev->dev);
+	if (IS_ERR(hwpt)) {
+		rc = PTR_ERR(hwpt);
+		goto out_unlock;
+	}
+	hwpt->auto_domain = true;
+
+	rc = iommufd_device_do_attach(idev, hwpt, flags);
+	if (rc)
+		goto out_abort;
+	list_add_tail(&hwpt->hwpt_item, &ioas->hwpt_list);
+
+	mutex_unlock(&ioas->mutex);
+	iommufd_object_finalize(idev->ictx, &hwpt->obj);
+	return 0;
+
+out_abort:
+	iommufd_object_abort_and_destroy(idev->ictx, &hwpt->obj);
+out_unlock:
+	mutex_unlock(&ioas->mutex);
+	return rc;
+}

Best regards,
baolu



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