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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright © 2015 Intel Corporation.
*
* Authors: David Woodhouse <David.Woodhouse@intel.com>
*/
#ifndef __INTEL_SVM_H__
#define __INTEL_SVM_H__
/* Page Request Queue depth */
#define PRQ_ORDER 2
#define PRQ_RING_MASK ((0x1000 << PRQ_ORDER) - 0x20)
#define PRQ_DEPTH ((0x1000 << PRQ_ORDER) >> 5)
/*
* The SVM_FLAG_SUPERVISOR_MODE flag requests a PASID which can be used only
* for access to kernel addresses. No IOTLB flushes are automatically done
* for kernel mappings; it is valid only for access to the kernel's static
* 1:1 mapping of physical memory — not to vmalloc or even module mappings.
* A future API addition may permit the use of such ranges, by means of an
* explicit IOTLB flush call (akin to the DMA API's unmap method).
*
* It is unlikely that we will ever hook into flush_tlb_kernel_range() to
* do such IOTLB flushes automatically.
*/
#define SVM_FLAG_SUPERVISOR_MODE BIT(0)
/*
* The SVM_FLAG_GUEST_MODE flag is used when a PASID bind is for guest
* processes. Compared to the host bind, the primary differences are:
* 1. mm life cycle management
* 2. fault reporting
*/
#define SVM_FLAG_GUEST_MODE BIT(1)
/*
* The SVM_FLAG_GUEST_PASID flag is used when a guest has its own PASID space,
* which requires guest and host PASID translation at both directions.
*/
#define SVM_FLAG_GUEST_PASID BIT(2)
#endif /* __INTEL_SVM_H__ */
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