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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* IOMMU user API definitions
*/
#ifndef _IOMMU_H
#define _IOMMU_H
#include <linux/types.h>
#define IOMMU_FAULT_PERM_READ (1 << 0) /* read */
#define IOMMU_FAULT_PERM_WRITE (1 << 1) /* write */
#define IOMMU_FAULT_PERM_EXEC (1 << 2) /* exec */
#define IOMMU_FAULT_PERM_PRIV (1 << 3) /* privileged */
/* Generic fault types, can be expanded IRQ remapping fault */
enum iommu_fault_type {
IOMMU_FAULT_DMA_UNRECOV = 1, /* unrecoverable fault */
IOMMU_FAULT_PAGE_REQ, /* page request fault */
};
enum iommu_fault_reason {
IOMMU_FAULT_REASON_UNKNOWN = 0,
/* Could not access the PASID table (fetch caused external abort) */
IOMMU_FAULT_REASON_PASID_FETCH,
/* PASID entry is invalid or has configuration errors */
IOMMU_FAULT_REASON_BAD_PASID_ENTRY,
/*
* PASID is out of range (e.g. exceeds the maximum PASID
* supported by the IOMMU) or disabled.
*/
IOMMU_FAULT_REASON_PASID_INVALID,
/*
* An external abort occurred fetching (or updating) a translation
* table descriptor
*/
IOMMU_FAULT_REASON_WALK_EABT,
/*
* Could not access the page table entry (Bad address),
* actual translation fault
*/
IOMMU_FAULT_REASON_PTE_FETCH,
/* Protection flag check failed */
IOMMU_FAULT_REASON_PERMISSION,
/* access flag check failed */
IOMMU_FAULT_REASON_ACCESS,
/* Output address of a translation stage caused Address Size fault */
IOMMU_FAULT_REASON_OOR_ADDRESS,
};
/**
* struct iommu_fault_unrecoverable - Unrecoverable fault data
* @reason: reason of the fault, from &enum iommu_fault_reason
* @flags: parameters of this fault (IOMMU_FAULT_UNRECOV_* values)
* @pasid: Process Address Space ID
* @perm: requested permission access using by the incoming transaction
* (IOMMU_FAULT_PERM_* values)
* @addr: offending page address
* @fetch_addr: address that caused a fetch abort, if any
*/
struct iommu_fault_unrecoverable {
__u32 reason;
#define IOMMU_FAULT_UNRECOV_PASID_VALID (1 << 0)
#define IOMMU_FAULT_UNRECOV_ADDR_VALID (1 << 1)
#define IOMMU_FAULT_UNRECOV_FETCH_ADDR_VALID (1 << 2)
__u32 flags;
__u32 pasid;
__u32 perm;
__u64 addr;
__u64 fetch_addr;
};
/**
* struct iommu_fault_page_request - Page Request data
* @flags: encodes whether the corresponding fields are valid and whether this
* is the last page in group (IOMMU_FAULT_PAGE_REQUEST_* values).
* When IOMMU_FAULT_PAGE_RESPONSE_NEEDS_PASID is set, the page response
* must have the same PASID value as the page request. When it is clear,
* the page response should not have a PASID.
* @pasid: Process Address Space ID
* @grpid: Page Request Group Index
* @perm: requested page permissions (IOMMU_FAULT_PERM_* values)
* @addr: page address
* @private_data: device-specific private information
*/
struct iommu_fault_page_request {
#define IOMMU_FAULT_PAGE_REQUEST_PASID_VALID (1 << 0)
#define IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE (1 << 1)
#define IOMMU_FAULT_PAGE_REQUEST_PRIV_DATA (1 << 2)
#define IOMMU_FAULT_PAGE_RESPONSE_NEEDS_PASID (1 << 3)
__u32 flags;
__u32 pasid;
__u32 grpid;
__u32 perm;
__u64 addr;
__u64 private_data[2];
};
/**
* struct iommu_fault - Generic fault data
* @type: fault type from &enum iommu_fault_type
* @padding: reserved for future use (should be zero)
* @event: fault event, when @type is %IOMMU_FAULT_DMA_UNRECOV
* @prm: Page Request message, when @type is %IOMMU_FAULT_PAGE_REQ
* @padding2: sets the fault size to allow for future extensions
*/
struct iommu_fault {
__u32 type;
__u32 padding;
union {
struct iommu_fault_unrecoverable event;
struct iommu_fault_page_request prm;
__u8 padding2[56];
};
};
/**
* enum iommu_page_response_code - Return status of fault handlers
* @IOMMU_PAGE_RESP_SUCCESS: Fault has been handled and the page tables
* populated, retry the access. This is "Success" in PCI PRI.
* @IOMMU_PAGE_RESP_FAILURE: General error. Drop all subsequent faults from
* this device if possible. This is "Response Failure" in PCI PRI.
* @IOMMU_PAGE_RESP_INVALID: Could not handle this fault, don't retry the
* access. This is "Invalid Request" in PCI PRI.
*/
enum iommu_page_response_code {
IOMMU_PAGE_RESP_SUCCESS = 0,
IOMMU_PAGE_RESP_INVALID,
IOMMU_PAGE_RESP_FAILURE,
};
/**
* struct iommu_page_response - Generic page response information
* @argsz: User filled size of this data
* @version: API version of this structure
* @flags: encodes whether the corresponding fields are valid
* (IOMMU_FAULT_PAGE_RESPONSE_* values)
* @pasid: Process Address Space ID
* @grpid: Page Request Group Index
* @code: response code from &enum iommu_page_response_code
*/
struct iommu_page_response {
__u32 argsz;
#define IOMMU_PAGE_RESP_VERSION_1 1
__u32 version;
#define IOMMU_PAGE_RESP_PASID_VALID (1 << 0)
__u32 flags;
__u32 pasid;
__u32 grpid;
__u32 code;
};
#endif /* _IOMMU_H */
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