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iommu.h
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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 */