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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright © 2015 Intel Corporation.
4 *
5 * Authors: David Woodhouse <David.Woodhouse@intel.com>
6 */
7
8#ifndef __INTEL_SVM_H__
9#define __INTEL_SVM_H__
10
11/* Page Request Queue depth */
12#define PRQ_ORDER 2
13#define PRQ_RING_MASK ((0x1000 << PRQ_ORDER) - 0x20)
14#define PRQ_DEPTH ((0x1000 << PRQ_ORDER) >> 5)
15
16/*
17 * The SVM_FLAG_SUPERVISOR_MODE flag requests a PASID which can be used only
18 * for access to kernel addresses. No IOTLB flushes are automatically done
19 * for kernel mappings; it is valid only for access to the kernel's static
20 * 1:1 mapping of physical memory — not to vmalloc or even module mappings.
21 * A future API addition may permit the use of such ranges, by means of an
22 * explicit IOTLB flush call (akin to the DMA API's unmap method).
23 *
24 * It is unlikely that we will ever hook into flush_tlb_kernel_range() to
25 * do such IOTLB flushes automatically.
26 */
27#define SVM_FLAG_SUPERVISOR_MODE BIT(0)
28/*
29 * The SVM_FLAG_GUEST_MODE flag is used when a PASID bind is for guest
30 * processes. Compared to the host bind, the primary differences are:
31 * 1. mm life cycle management
32 * 2. fault reporting
33 */
34#define SVM_FLAG_GUEST_MODE BIT(1)
35/*
36 * The SVM_FLAG_GUEST_PASID flag is used when a guest has its own PASID space,
37 * which requires guest and host PASID translation at both directions.
38 */
39#define SVM_FLAG_GUEST_PASID BIT(2)
40
41#endif /* __INTEL_SVM_H__ */