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 /* Values for rxwp in fault_cb callback */ 12 #define SVM_REQ_READ (1<<3) 13 #define SVM_REQ_WRITE (1<<2) 14 #define SVM_REQ_EXEC (1<<1) 15 #define SVM_REQ_PRIV (1<<0) 16 17 /* Page Request Queue depth */ 18 #define PRQ_ORDER 2 19 #define PRQ_RING_MASK ((0x1000 << PRQ_ORDER) - 0x20) 20 #define PRQ_DEPTH ((0x1000 << PRQ_ORDER) >> 5) 21 22 /* 23 * The SVM_FLAG_SUPERVISOR_MODE flag requests a PASID which can be used only 24 * for access to kernel addresses. No IOTLB flushes are automatically done 25 * for kernel mappings; it is valid only for access to the kernel's static 26 * 1:1 mapping of physical memory — not to vmalloc or even module mappings. 27 * A future API addition may permit the use of such ranges, by means of an 28 * explicit IOTLB flush call (akin to the DMA API's unmap method). 29 * 30 * It is unlikely that we will ever hook into flush_tlb_kernel_range() to 31 * do such IOTLB flushes automatically. 32 */ 33 #define SVM_FLAG_SUPERVISOR_MODE BIT(0) 34 /* 35 * The SVM_FLAG_GUEST_MODE flag is used when a PASID bind is for guest 36 * processes. Compared to the host bind, the primary differences are: 37 * 1. mm life cycle management 38 * 2. fault reporting 39 */ 40 #define SVM_FLAG_GUEST_MODE BIT(1) 41 /* 42 * The SVM_FLAG_GUEST_PASID flag is used when a guest has its own PASID space, 43 * which requires guest and host PASID translation at both directions. 44 */ 45 #define SVM_FLAG_GUEST_PASID BIT(2) 46 47 #endif /* __INTEL_SVM_H__ */ 48