/* 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 4 #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) #endif /* __INTEL_SVM_H__ */