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A scalable mode DMAR table walk would involve looking at bits in each stage of walk, like, 1. Is PASID enabled in the context entry? 2. What's the size of PASID directory? 3. Is the PASID directory entry present? 4. Is the PASID table entry present? 5. Number of PASID table entries? Hence, add these macros that will later be used during this walk. Apart from adding new macros, move existing macros (like pasid_pde_is_present(), get_pasid_table_from_pde() and pasid_supported()) to appropriate header files so that they could be reused. Cc: Joerg Roedel <joro@8bytes.org> Cc: Ashok Raj <ashok.raj@intel.com> Cc: Lu Baolu <baolu.lu@linux.intel.com> Cc: Sohil Mehta <sohil.mehta@intel.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Jacob Pan <jacob.jun.pan@linux.intel.com> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* intel-pasid.h - PASID idr, table and entry header
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*
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* Copyright (C) 2018 Intel Corporation
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*
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* Author: Lu Baolu <baolu.lu@linux.intel.com>
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*/
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#ifndef __INTEL_PASID_H
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#define __INTEL_PASID_H
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#define PASID_RID2PASID 0x0
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#define PASID_MIN 0x1
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#define PASID_MAX 0x100000
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#define PASID_PTE_MASK 0x3F
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#define PASID_PTE_PRESENT 1
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#define PDE_PFN_MASK PAGE_MASK
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#define PASID_PDE_SHIFT 6
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#define MAX_NR_PASID_BITS 20
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#define PASID_TBL_ENTRIES BIT(PASID_PDE_SHIFT)
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#define is_pasid_enabled(entry) (((entry)->lo >> 3) & 0x1)
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#define get_pasid_dir_size(entry) (1 << ((((entry)->lo >> 9) & 0x7) + 7))
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/*
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* Domain ID reserved for pasid entries programmed for first-level
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* only and pass-through transfer modes.
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*/
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#define FLPT_DEFAULT_DID 1
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/*
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* The SUPERVISOR_MODE flag indicates a first level translation which
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* can be used for access to kernel addresses. It is valid only for
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* access to the kernel's static 1:1 mapping of physical memory — not
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* to vmalloc or even module mappings.
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*/
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#define PASID_FLAG_SUPERVISOR_MODE BIT(0)
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struct pasid_dir_entry {
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u64 val;
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};
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struct pasid_entry {
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u64 val[8];
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};
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/* The representative of a PASID table */
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struct pasid_table {
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void *table; /* pasid table pointer */
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int order; /* page order of pasid table */
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int max_pasid; /* max pasid */
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struct list_head dev; /* device list */
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};
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/* Get PRESENT bit of a PASID directory entry. */
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static inline bool pasid_pde_is_present(struct pasid_dir_entry *pde)
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{
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return READ_ONCE(pde->val) & PASID_PTE_PRESENT;
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}
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/* Get PASID table from a PASID directory entry. */
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static inline struct pasid_entry *
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get_pasid_table_from_pde(struct pasid_dir_entry *pde)
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{
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if (!pasid_pde_is_present(pde))
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return NULL;
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return phys_to_virt(READ_ONCE(pde->val) & PDE_PFN_MASK);
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}
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/* Get PRESENT bit of a PASID table entry. */
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static inline bool pasid_pte_is_present(struct pasid_entry *pte)
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{
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return READ_ONCE(pte->val[0]) & PASID_PTE_PRESENT;
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}
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extern u32 intel_pasid_max_id;
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int intel_pasid_alloc_id(void *ptr, int start, int end, gfp_t gfp);
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void intel_pasid_free_id(int pasid);
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void *intel_pasid_lookup_id(int pasid);
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int intel_pasid_alloc_table(struct device *dev);
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void intel_pasid_free_table(struct device *dev);
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struct pasid_table *intel_pasid_get_table(struct device *dev);
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int intel_pasid_get_dev_max_id(struct device *dev);
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struct pasid_entry *intel_pasid_get_entry(struct device *dev, int pasid);
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int intel_pasid_setup_first_level(struct intel_iommu *iommu,
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struct device *dev, pgd_t *pgd,
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int pasid, u16 did, int flags);
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int intel_pasid_setup_second_level(struct intel_iommu *iommu,
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struct dmar_domain *domain,
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struct device *dev, int pasid);
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int intel_pasid_setup_pass_through(struct intel_iommu *iommu,
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struct dmar_domain *domain,
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struct device *dev, int pasid);
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void intel_pasid_tear_down_entry(struct intel_iommu *iommu,
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struct device *dev, int pasid);
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#endif /* __INTEL_PASID_H */
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