cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pasid.h (3931B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * 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 PASID_PTE_FPD			2
     19#define PDE_PFN_MASK			PAGE_MASK
     20#define PASID_PDE_SHIFT			6
     21#define MAX_NR_PASID_BITS		20
     22#define PASID_TBL_ENTRIES		BIT(PASID_PDE_SHIFT)
     23
     24#define is_pasid_enabled(entry)		(((entry)->lo >> 3) & 0x1)
     25#define get_pasid_dir_size(entry)	(1 << ((((entry)->lo >> 9) & 0x7) + 7))
     26
     27/* Virtual command interface for enlightened pasid management. */
     28#define VCMD_CMD_ALLOC			0x1
     29#define VCMD_CMD_FREE			0x2
     30#define VCMD_VRSP_IP			0x1
     31#define VCMD_VRSP_SC(e)			(((e) & 0xff) >> 1)
     32#define VCMD_VRSP_SC_SUCCESS		0
     33#define VCMD_VRSP_SC_NO_PASID_AVAIL	16
     34#define VCMD_VRSP_SC_INVALID_PASID	16
     35#define VCMD_VRSP_RESULT_PASID(e)	(((e) >> 16) & 0xfffff)
     36#define VCMD_CMD_OPERAND(e)		((e) << 16)
     37/*
     38 * Domain ID reserved for pasid entries programmed for first-level
     39 * only and pass-through transfer modes.
     40 */
     41#define FLPT_DEFAULT_DID		1
     42
     43/*
     44 * The SUPERVISOR_MODE flag indicates a first level translation which
     45 * can be used for access to kernel addresses. It is valid only for
     46 * access to the kernel's static 1:1 mapping of physical memory — not
     47 * to vmalloc or even module mappings.
     48 */
     49#define PASID_FLAG_SUPERVISOR_MODE	BIT(0)
     50#define PASID_FLAG_NESTED		BIT(1)
     51#define PASID_FLAG_PAGE_SNOOP		BIT(2)
     52
     53/*
     54 * The PASID_FLAG_FL5LP flag Indicates using 5-level paging for first-
     55 * level translation, otherwise, 4-level paging will be used.
     56 */
     57#define PASID_FLAG_FL5LP		BIT(1)
     58
     59struct pasid_dir_entry {
     60	u64 val;
     61};
     62
     63struct pasid_entry {
     64	u64 val[8];
     65};
     66
     67#define PASID_ENTRY_PGTT_FL_ONLY	(1)
     68#define PASID_ENTRY_PGTT_SL_ONLY	(2)
     69#define PASID_ENTRY_PGTT_NESTED		(3)
     70#define PASID_ENTRY_PGTT_PT		(4)
     71
     72/* The representative of a PASID table */
     73struct pasid_table {
     74	void			*table;		/* pasid table pointer */
     75	int			order;		/* page order of pasid table */
     76	u32			max_pasid;	/* max pasid */
     77};
     78
     79/* Get PRESENT bit of a PASID directory entry. */
     80static inline bool pasid_pde_is_present(struct pasid_dir_entry *pde)
     81{
     82	return READ_ONCE(pde->val) & PASID_PTE_PRESENT;
     83}
     84
     85/* Get PASID table from a PASID directory entry. */
     86static inline struct pasid_entry *
     87get_pasid_table_from_pde(struct pasid_dir_entry *pde)
     88{
     89	if (!pasid_pde_is_present(pde))
     90		return NULL;
     91
     92	return phys_to_virt(READ_ONCE(pde->val) & PDE_PFN_MASK);
     93}
     94
     95/* Get PRESENT bit of a PASID table entry. */
     96static inline bool pasid_pte_is_present(struct pasid_entry *pte)
     97{
     98	return READ_ONCE(pte->val[0]) & PASID_PTE_PRESENT;
     99}
    100
    101/* Get PGTT field of a PASID table entry */
    102static inline u16 pasid_pte_get_pgtt(struct pasid_entry *pte)
    103{
    104	return (u16)((READ_ONCE(pte->val[0]) >> 6) & 0x7);
    105}
    106
    107extern unsigned int intel_pasid_max_id;
    108int intel_pasid_alloc_table(struct device *dev);
    109void intel_pasid_free_table(struct device *dev);
    110struct pasid_table *intel_pasid_get_table(struct device *dev);
    111int intel_pasid_setup_first_level(struct intel_iommu *iommu,
    112				  struct device *dev, pgd_t *pgd,
    113				  u32 pasid, u16 did, int flags);
    114int intel_pasid_setup_second_level(struct intel_iommu *iommu,
    115				   struct dmar_domain *domain,
    116				   struct device *dev, u32 pasid);
    117int intel_pasid_setup_pass_through(struct intel_iommu *iommu,
    118				   struct dmar_domain *domain,
    119				   struct device *dev, u32 pasid);
    120void intel_pasid_tear_down_entry(struct intel_iommu *iommu,
    121				 struct device *dev, u32 pasid,
    122				 bool fault_ignore);
    123int vcmd_alloc_pasid(struct intel_iommu *iommu, u32 *pasid);
    124void vcmd_free_pasid(struct intel_iommu *iommu, u32 pasid);
    125void intel_pasid_setup_page_snoop_control(struct intel_iommu *iommu,
    126					  struct device *dev, u32 pasid);
    127#endif /* __INTEL_PASID_H */