LXR linux/include/linux/intel-svm.h

   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