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authorLu Baolu <baolu.lu@linux.intel.com>2018-07-14 10:46:54 +0300
committerJoerg Roedel <jroedel@suse.de>2018-07-20 15:44:23 +0300
commit562831747f6299abd481b5b00bd4fa19d5c8a259 (patch)
tree48c52168f4d8d570bb79a2b30749d1c4cc142ca7 /drivers/iommu/intel-pasid.h
parent3e781fcafedb6d364f93caa44128d63e975daa6d (diff)
downloadlinux-562831747f6299abd481b5b00bd4fa19d5c8a259.tar.xz
iommu/vt-d: Global PASID name space
This adds the system wide PASID name space for the PASID allocation. Currently we are using per IOMMU PASID name spaces which are not suitable for some use cases. For an example, one application (associated with a PASID) might talk to two physical devices simultaneously while the two devices could reside behind two different IOMMU units. Cc: Ashok Raj <ashok.raj@intel.com> Cc: Jacob Pan <jacob.jun.pan@linux.intel.com> Cc: Kevin Tian <kevin.tian@intel.com> Cc: Liu Yi L <yi.l.liu@intel.com> Suggested-by: Ashok Raj <ashok.raj@intel.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Reviewed-by: Liu Yi L <yi.l.liu@intel.com> Reviewed-by: Peter Xu <peterx@redhat.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/intel-pasid.h')
-rw-r--r--drivers/iommu/intel-pasid.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/iommu/intel-pasid.h b/drivers/iommu/intel-pasid.h
new file mode 100644
index 000000000000..b1c5296290e5
--- /dev/null
+++ b/drivers/iommu/intel-pasid.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * intel-pasid.h - PASID idr, table and entry header
+ *
+ * Copyright (C) 2018 Intel Corporation
+ *
+ * Author: Lu Baolu <baolu.lu@linux.intel.com>
+ */
+
+#ifndef __INTEL_PASID_H
+#define __INTEL_PASID_H
+
+#define PASID_MIN 0x1
+#define PASID_MAX 0x100000
+
+extern u32 intel_pasid_max_id;
+int intel_pasid_alloc_id(void *ptr, int start, int end, gfp_t gfp);
+void intel_pasid_free_id(int pasid);
+void *intel_pasid_lookup_id(int pasid);
+
+#endif /* __INTEL_PASID_H */