drivers/iommu/intel-pasid.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * intel-pasid.h - PASID idr, table and entry header
   4  *
   5  * Copyright (C) 2018 Intel Corporation
   6  *
   7  * Author: Lu Baolu <baolu.lu@linux.intel.com>
   8  */
   9
  10 #ifndef __INTEL_PASID_H
  11 #define __INTEL_PASID_H
  12
  13 #define PASID_RID2PASID                 0x0
  14 #define PASID_MIN                       0x1
  15 #define PASID_MAX                       0x100000
  16 #define PASID_PTE_MASK                  0x3F
  17 #define PASID_PTE_PRESENT               1
  18 #define PDE_PFN_MASK                    PAGE_MASK
  19 #define PASID_PDE_SHIFT                 6
  20 #define MAX_NR_PASID_BITS               20
  21
  22 /*
  23  * Domain ID reserved for pasid entries programmed for first-level
  24  * only and pass-through transfer modes.
  25  */
  26 #define FLPT_DEFAULT_DID                1
  27
  28 /*
  29  * The SUPERVISOR_MODE flag indicates a first level translation which
  30  * can be used for access to kernel addresses. It is valid only for
  31  * access to the kernel's static 1:1 mapping of physical memory — not
  32  * to vmalloc or even module mappings.
  33  */
  34 #define PASID_FLAG_SUPERVISOR_MODE      BIT(0)
  35
  36 struct pasid_dir_entry {
  37         u64 val;
  38 };
  39
  40 struct pasid_entry {
  41         u64 val[8];
  42 };
  43
  44 /* The representative of a PASID table */
  45 struct pasid_table {
  46         void                    *table;         /* pasid table pointer */
  47         int                     order;          /* page order of pasid table */
  48         int                     max_pasid;      /* max pasid */
  49         struct list_head        dev;            /* device list */
  50 };
  51
  52 extern u32 intel_pasid_max_id;
  53 int intel_pasid_alloc_id(void *ptr, int start, int end, gfp_t gfp);
  54 void intel_pasid_free_id(int pasid);
  55 void *intel_pasid_lookup_id(int pasid);
  56 int intel_pasid_alloc_table(struct device *dev);
  57 void intel_pasid_free_table(struct device *dev);
  58 struct pasid_table *intel_pasid_get_table(struct device *dev);
  59 int intel_pasid_get_dev_max_id(struct device *dev);
  60 struct pasid_entry *intel_pasid_get_entry(struct device *dev, int pasid);
  61 int intel_pasid_setup_first_level(struct intel_iommu *iommu,
  62                                   struct device *dev, pgd_t *pgd,
  63                                   int pasid, u16 did, int flags);
  64 int intel_pasid_setup_second_level(struct intel_iommu *iommu,
  65                                    struct dmar_domain *domain,
  66                                    struct device *dev, int pasid);
  67 int intel_pasid_setup_pass_through(struct intel_iommu *iommu,
  68                                    struct dmar_domain *domain,
  69                                    struct device *dev, int pasid);
  70 void intel_pasid_tear_down_entry(struct intel_iommu *iommu,
  71                                  struct device *dev, int pasid);
  72
  73 #endif /* __INTEL_PASID_H */