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/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright © 2015 Intel Corporation. * * Authors: David Woodhouse <[email protected]> */ #ifndef __INTEL_SVM_H__ #define __INTEL_SVM_H__ /* Values for rxwp in fault_cb callback */ #define SVM_REQ_READ (1<<3) #define SVM_REQ_WRITE (1<<2) #define SVM_REQ_EXEC (1<<1) #define SVM_REQ_PRIV (1<<0) /* 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__ */