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Diffstat (limited to '')
| -rw-r--r-- | drivers/iommu/intel/pasid.h | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/drivers/iommu/intel/pasid.h b/drivers/iommu/intel/pasid.h new file mode 100644 index 000000000..20c54e50f --- /dev/null +++ b/drivers/iommu/intel/pasid.h @@ -0,0 +1,128 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * 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 PASID_PTE_FPD 2 +#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)) + +/* Virtual command interface for enlightened pasid management. */ +#define VCMD_CMD_ALLOC 0x1 +#define VCMD_CMD_FREE 0x2 +#define VCMD_VRSP_IP 0x1 +#define VCMD_VRSP_SC(e) (((e) & 0xff) >> 1) +#define VCMD_VRSP_SC_SUCCESS 0 +#define VCMD_VRSP_SC_NO_PASID_AVAIL 16 +#define VCMD_VRSP_SC_INVALID_PASID 16 +#define VCMD_VRSP_RESULT_PASID(e) (((e) >> 16) & 0xfffff) +#define VCMD_CMD_OPERAND(e) ((e) << 16) +/* + * Domain ID reserved for pasid entries programmed for first-level + * only and pass-through transfer modes. + */ +#define FLPT_DEFAULT_DID 1 +#define NUM_RESERVED_DID 2 + +/* + * 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) +#define PASID_FLAG_NESTED BIT(1) +#define PASID_FLAG_PAGE_SNOOP BIT(2) + +/* + * The PASID_FLAG_FL5LP flag Indicates using 5-level paging for first- + * level translation, otherwise, 4-level paging will be used. + */ +#define PASID_FLAG_FL5LP BIT(1) + +struct pasid_dir_entry { + u64 val; +}; + +struct pasid_entry { + u64 val[8]; +}; + +#define PASID_ENTRY_PGTT_FL_ONLY (1) +#define PASID_ENTRY_PGTT_SL_ONLY (2) +#define PASID_ENTRY_PGTT_NESTED (3) +#define PASID_ENTRY_PGTT_PT (4) + +/* The representative of a PASID table */ +struct pasid_table { + void *table; /* pasid table pointer */ + int order; /* page order of pasid table */ + u32 max_pasid; /* max pasid */ +}; + +/* 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; +} + +/* Get PGTT field of a PASID table entry */ +static inline u16 pasid_pte_get_pgtt(struct pasid_entry *pte) +{ + return (u16)((READ_ONCE(pte->val[0]) >> 6) & 0x7); +} + +extern unsigned int intel_pasid_max_id; +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_setup_first_level(struct intel_iommu *iommu, + struct device *dev, pgd_t *pgd, + u32 pasid, u16 did, int flags); +int intel_pasid_setup_second_level(struct intel_iommu *iommu, + struct dmar_domain *domain, + struct device *dev, u32 pasid); +int intel_pasid_setup_pass_through(struct intel_iommu *iommu, + struct dmar_domain *domain, + struct device *dev, u32 pasid); +void intel_pasid_tear_down_entry(struct intel_iommu *iommu, + struct device *dev, u32 pasid, + bool fault_ignore); +int vcmd_alloc_pasid(struct intel_iommu *iommu, u32 *pasid); +void vcmd_free_pasid(struct intel_iommu *iommu, u32 pasid); +void intel_pasid_setup_page_snoop_control(struct intel_iommu *iommu, + struct device *dev, u32 pasid); +#endif /* __INTEL_PASID_H */ |