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/* SPDX-License-Identifier: GPL-2.0 */
/*
* intel-pasid.h - PASID idr, table and entry header
*
* Copyright (C) 2018 Intel Corporation
*
* Author: Lu Baolu <baolu.lu@linux.intel.com>
*/
#ifndef __INTEL_PASID_H
#define __INTEL_PASID_H
#define PASID_RID2PASID 0x0
#define PASID_MIN 0x1
#define PASID_MAX 0x100000
#define PASID_PTE_MASK 0x3F
#define PASID_PTE_PRESENT 1
#define PDE_PFN_MASK PAGE_MASK
#define PASID_PDE_SHIFT 6
#define MAX_NR_PASID_BITS 20
#define PASID_TBL_ENTRIES BIT(PASID_PDE_SHIFT)
#define is_pasid_enabled(entry) (((entry)->lo >> 3) & 0x1)
#define get_pasid_dir_size(entry) (1 << ((((entry)->lo >> 9) & 0x7) + 7))
/*
* Domain ID reserved for pasid entries programmed for first-level
* only and pass-through transfer modes.
*/
#define FLPT_DEFAULT_DID 1
/*
* The SUPERVISOR_MODE flag indicates a first level translation which
* can be used for access to kernel addresses. It is valid only for
* access to the kernel's static 1:1 mapping of physical memory — not
* to vmalloc or even module mappings.
*/
#define PASID_FLAG_SUPERVISOR_MODE BIT(0)
struct pasid_dir_entry {
u64 val;
};
struct pasid_entry {
u64 val[8];
};
/* The representative of a PASID table */
struct pasid_table {
void *table; /* pasid table pointer */
int order; /* page order of pasid table */
int max_pasid; /* max pasid */
struct list_head dev; /* device list */
};
/* Get PRESENT bit of a PASID directory entry. */
static inline bool pasid_pde_is_present(struct pasid_dir_entry *pde)
{
return READ_ONCE(pde->val) & PASID_PTE_PRESENT;
}
/* Get PASID table from a PASID directory entry. */
static inline struct pasid_entry *
get_pasid_table_from_pde(struct pasid_dir_entry *pde)
{
if (!pasid_pde_is_present(pde))
return NULL;
return phys_to_virt(READ_ONCE(pde->val) & PDE_PFN_MASK);
}
/* Get PRESENT bit of a PASID table entry. */
static inline bool pasid_pte_is_present(struct pasid_entry *pte)
{
return READ_ONCE(pte->val[0]) & PASID_PTE_PRESENT;
}
extern u32 intel_pasid_max_id;
int intel_pasid_alloc_id(void *ptr, int start, int end, gfp_t gfp);
void intel_pasid_free_id(int pasid);
void *intel_pasid_lookup_id(int pasid);
int intel_pasid_alloc_table(struct device *dev);
void intel_pasid_free_table(struct device *dev);
struct pasid_table *intel_pasid_get_table(struct device *dev);
int intel_pasid_get_dev_max_id(struct device *dev);
struct pasid_entry *intel_pasid_get_entry(struct device *dev, int pasid);
int intel_pasid_setup_first_level(struct intel_iommu *iommu,
struct device *dev, pgd_t *pgd,
int pasid, u16 did, int flags);
int intel_pasid_setup_second_level(struct intel_iommu *iommu,
struct dmar_domain *domain,
struct device *dev, int pasid);
int intel_pasid_setup_pass_through(struct intel_iommu *iommu,
struct dmar_domain *domain,
struct device *dev, int pasid);
void intel_pasid_tear_down_entry(struct intel_iommu *iommu,
struct device *dev, int pasid);
#endif /* __INTEL_PASID_H */
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