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 struct device; 12 13 struct svm_dev_ops { 14 void (*fault_cb)(struct device *dev, u32 pasid, u64 address, 15 void *private, int rwxp, int response); 16 }; 17 18 /* Values for rxwp in fault_cb callback */ 19 #define SVM_REQ_READ (1<<3) 20 #define SVM_REQ_WRITE (1<<2) 21 #define SVM_REQ_EXEC (1<<1) 22 #define SVM_REQ_PRIV (1<<0) 23 24 /* 25 * The SVM_FLAG_PRIVATE_PASID flag requests a PASID which is *not* the "main" 26 * PASID for the current process. Even if a PASID already exists, a new one 27 * will be allocated. And the PASID allocated with SVM_FLAG_PRIVATE_PASID 28 * will not be given to subsequent callers. This facility allows a driver to 29 * disambiguate between multiple device contexts which access the same MM, 30 * if there is no other way to do so. It should be used sparingly, if at all. 31 */ 32 #define SVM_FLAG_PRIVATE_PASID (1<<0) 33 34 /* 35 * The SVM_FLAG_SUPERVISOR_MODE flag requests a PASID which can be used only 36 * for access to kernel addresses. No IOTLB flushes are automatically done 37 * for kernel mappings; it is valid only for access to the kernel's static 38 * 1:1 mapping of physical memory — not to vmalloc or even module mappings. 39 * A future API addition may permit the use of such ranges, by means of an 40 * explicit IOTLB flush call (akin to the DMA API's unmap method). 41 * 42 * It is unlikely that we will ever hook into flush_tlb_kernel_range() to 43 * do such IOTLB flushes automatically. 44 */ 45 #define SVM_FLAG_SUPERVISOR_MODE (1<<1) 46 /* 47 * The SVM_FLAG_GUEST_MODE flag is used when a PASID bind is for guest 48 * processes. Compared to the host bind, the primary differences are: 49 * 1. mm life cycle management 50 * 2. fault reporting 51 */ 52 #define SVM_FLAG_GUEST_MODE (1<<2) 53 /* 54 * The SVM_FLAG_GUEST_PASID flag is used when a guest has its own PASID space, 55 * which requires guest and host PASID translation at both directions. 56 */ 57 #define SVM_FLAG_GUEST_PASID (1<<3) 58 59 #endif /* __INTEL_SVM_H__ */ 60
