forked from mirrors/linux
58b55c859a
Ease future extensions of struct iommu_fault_page_request and struct iommu_fault_unrecoverable by adding a few bytes of padding. That way, a new field can be added to either of these structures by simply introducing a new flag. To extend it after the size limit is reached, a new fault reporting structure will have to be negotiated with userspace. With 56 bytes of padding, the total size of iommu_fault is 64 bytes and fits in a cache line on a lot of contemporary machines, while providing 16 and 24 bytes of extension to structures iommu_fault_page_request and iommu_fault_unrecoverable respectively. Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com> Acked-by: Jacob Pan <jacob.jun.pan@linux.intel.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
155 lines
4.5 KiB
C
155 lines
4.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* IOMMU user API definitions
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*/
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#ifndef _UAPI_IOMMU_H
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#define _UAPI_IOMMU_H
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#include <linux/types.h>
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#define IOMMU_FAULT_PERM_READ (1 << 0) /* read */
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#define IOMMU_FAULT_PERM_WRITE (1 << 1) /* write */
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#define IOMMU_FAULT_PERM_EXEC (1 << 2) /* exec */
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#define IOMMU_FAULT_PERM_PRIV (1 << 3) /* privileged */
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/* Generic fault types, can be expanded IRQ remapping fault */
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enum iommu_fault_type {
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IOMMU_FAULT_DMA_UNRECOV = 1, /* unrecoverable fault */
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IOMMU_FAULT_PAGE_REQ, /* page request fault */
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};
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enum iommu_fault_reason {
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IOMMU_FAULT_REASON_UNKNOWN = 0,
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/* Could not access the PASID table (fetch caused external abort) */
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IOMMU_FAULT_REASON_PASID_FETCH,
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/* PASID entry is invalid or has configuration errors */
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IOMMU_FAULT_REASON_BAD_PASID_ENTRY,
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/*
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* PASID is out of range (e.g. exceeds the maximum PASID
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* supported by the IOMMU) or disabled.
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*/
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IOMMU_FAULT_REASON_PASID_INVALID,
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/*
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* An external abort occurred fetching (or updating) a translation
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* table descriptor
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*/
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IOMMU_FAULT_REASON_WALK_EABT,
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/*
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* Could not access the page table entry (Bad address),
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* actual translation fault
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*/
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IOMMU_FAULT_REASON_PTE_FETCH,
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/* Protection flag check failed */
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IOMMU_FAULT_REASON_PERMISSION,
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/* access flag check failed */
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IOMMU_FAULT_REASON_ACCESS,
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/* Output address of a translation stage caused Address Size fault */
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IOMMU_FAULT_REASON_OOR_ADDRESS,
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};
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/**
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* struct iommu_fault_unrecoverable - Unrecoverable fault data
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* @reason: reason of the fault, from &enum iommu_fault_reason
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* @flags: parameters of this fault (IOMMU_FAULT_UNRECOV_* values)
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* @pasid: Process Address Space ID
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* @perm: requested permission access using by the incoming transaction
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* (IOMMU_FAULT_PERM_* values)
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* @addr: offending page address
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* @fetch_addr: address that caused a fetch abort, if any
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*/
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struct iommu_fault_unrecoverable {
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__u32 reason;
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#define IOMMU_FAULT_UNRECOV_PASID_VALID (1 << 0)
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#define IOMMU_FAULT_UNRECOV_ADDR_VALID (1 << 1)
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#define IOMMU_FAULT_UNRECOV_FETCH_ADDR_VALID (1 << 2)
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__u32 flags;
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__u32 pasid;
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__u32 perm;
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__u64 addr;
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__u64 fetch_addr;
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};
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/**
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* struct iommu_fault_page_request - Page Request data
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* @flags: encodes whether the corresponding fields are valid and whether this
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* is the last page in group (IOMMU_FAULT_PAGE_REQUEST_* values)
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* @pasid: Process Address Space ID
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* @grpid: Page Request Group Index
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* @perm: requested page permissions (IOMMU_FAULT_PERM_* values)
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* @addr: page address
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* @private_data: device-specific private information
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*/
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struct iommu_fault_page_request {
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#define IOMMU_FAULT_PAGE_REQUEST_PASID_VALID (1 << 0)
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#define IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE (1 << 1)
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#define IOMMU_FAULT_PAGE_REQUEST_PRIV_DATA (1 << 2)
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__u32 flags;
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__u32 pasid;
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__u32 grpid;
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__u32 perm;
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__u64 addr;
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__u64 private_data[2];
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};
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/**
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* struct iommu_fault - Generic fault data
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* @type: fault type from &enum iommu_fault_type
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* @padding: reserved for future use (should be zero)
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* @event: fault event, when @type is %IOMMU_FAULT_DMA_UNRECOV
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* @prm: Page Request message, when @type is %IOMMU_FAULT_PAGE_REQ
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* @padding2: sets the fault size to allow for future extensions
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*/
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struct iommu_fault {
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__u32 type;
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__u32 padding;
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union {
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struct iommu_fault_unrecoverable event;
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struct iommu_fault_page_request prm;
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__u8 padding2[56];
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};
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};
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/**
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* enum iommu_page_response_code - Return status of fault handlers
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* @IOMMU_PAGE_RESP_SUCCESS: Fault has been handled and the page tables
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* populated, retry the access. This is "Success" in PCI PRI.
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* @IOMMU_PAGE_RESP_FAILURE: General error. Drop all subsequent faults from
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* this device if possible. This is "Response Failure" in PCI PRI.
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* @IOMMU_PAGE_RESP_INVALID: Could not handle this fault, don't retry the
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* access. This is "Invalid Request" in PCI PRI.
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*/
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enum iommu_page_response_code {
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IOMMU_PAGE_RESP_SUCCESS = 0,
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IOMMU_PAGE_RESP_INVALID,
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IOMMU_PAGE_RESP_FAILURE,
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};
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/**
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* struct iommu_page_response - Generic page response information
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* @version: API version of this structure
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* @flags: encodes whether the corresponding fields are valid
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* (IOMMU_FAULT_PAGE_RESPONSE_* values)
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* @pasid: Process Address Space ID
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* @grpid: Page Request Group Index
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* @code: response code from &enum iommu_page_response_code
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*/
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struct iommu_page_response {
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#define IOMMU_PAGE_RESP_VERSION_1 1
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__u32 version;
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#define IOMMU_PAGE_RESP_PASID_VALID (1 << 0)
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__u32 flags;
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__u32 pasid;
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__u32 grpid;
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__u32 code;
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};
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#endif /* _UAPI_IOMMU_H */
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