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
  11struct device;
  12
  13struct svm_dev_ops {
  14        void (*fault_cb)(struct device *dev, int 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