100 строки
2.9 KiB
C
100 строки
2.9 KiB
C
/* 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 */
|