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iommu: Introduce device fault data

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Device faults detected by IOMMU can be reported outside the IOMMU
subsystem for further processing. This patch introduces
a generic device fault data structure.

The fault can be either an unrecoverable fault or a page request,
also referred to as a recoverable fault.

We only care about non internal faults that are likely to be reported
to an external subsystem.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Liu, Yi L <yi.l.liu@linux.intel.com>
Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jacob Pan 2019-06-03 15:57:47 +01:00 • committed by Joerg Roedel
parent ec6bc2e9e8
commit 4e32348ba5
2 changed files with 157 additions and 0 deletions
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118
include/uapi/linux/iommu.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* IOMMU user API definitions
*/
#ifndef _UAPI_IOMMU_H
#define _UAPI_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)
* @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)
__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
*/
struct iommu_fault {
__u32 type;
__u32 padding;
union {
struct iommu_fault_unrecoverable event;
struct iommu_fault_page_request prm;
};
};
#endif /* _UAPI_IOMMU_H */