1 files changed, 84 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_iommu.h b/drivers/gpu/drm/amd/amdkfd/kfd_iommu.h
new file mode 100644
index 000000000..8cf0fcbe8
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_iommu.h
@@ -0,0 +1,84 @@
+/* SPDX-License-Identifier: GPL-2.0 OR MIT */
+/*
+ * Copyright 2018-2022 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __KFD_IOMMU_H__
+#define __KFD_IOMMU_H__
+
+#include <linux/kconfig.h>
+
+#if IS_REACHABLE(CONFIG_AMD_IOMMU_V2)
+
+#define KFD_SUPPORT_IOMMU_V2
+
+int kfd_iommu_check_device(struct kfd_dev *kfd);
+int kfd_iommu_device_init(struct kfd_dev *kfd);
+
+int kfd_iommu_bind_process_to_device(struct kfd_process_device *pdd);
+void kfd_iommu_unbind_process(struct kfd_process *p);
+
+void kfd_iommu_suspend(struct kfd_dev *kfd);
+int kfd_iommu_resume(struct kfd_dev *kfd);
+
+int kfd_iommu_add_perf_counters(struct kfd_topology_device *kdev);
+
+#else
+
+static inline int kfd_iommu_check_device(struct kfd_dev *kfd)
+{
+	return -ENODEV;
+}
+static inline int kfd_iommu_device_init(struct kfd_dev *kfd)
+{
+#if IS_MODULE(CONFIG_AMD_IOMMU_V2)
+	WARN_ONCE(1, "iommu_v2 module is not usable by built-in KFD");
+#endif
+	return 0;
+}
+
+static inline int kfd_iommu_bind_process_to_device(
+	struct kfd_process_device *pdd)
+{
+	return 0;
+}
+static inline void kfd_iommu_unbind_process(struct kfd_process *p)
+{
+	/* empty */
+}
+
+static inline void kfd_iommu_suspend(struct kfd_dev *kfd)
+{
+	/* empty */
+}
+static inline int kfd_iommu_resume(struct kfd_dev *kfd)
+{
+	return 0;
+}
+
+static inline int kfd_iommu_add_perf_counters(struct kfd_topology_device *kdev)
+{
+	return 0;
+}
+
+#endif /* IS_REACHABLE(CONFIG_AMD_IOMMU_V2) */
+
+#endif /* __KFD_IOMMU_H__ */