From 4e32348ba5269aac1165f496b78189201568dd8c Mon Sep 17 00:00:00 2001 From: Jacob Pan Date: Mon, 3 Jun 2019 15:57:47 +0100 Subject: iommu: Introduce device fault data 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 Signed-off-by: Jean-Philippe Brucker Signed-off-by: Liu, Yi L Signed-off-by: Ashok Raj Signed-off-by: Eric Auger Signed-off-by: Joerg Roedel --- include/uapi/linux/iommu.h | 118 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 118 insertions(+) create mode 100644 include/uapi/linux/iommu.h (limited to 'include/uapi/linux') diff --git a/include/uapi/linux/iommu.h b/include/uapi/linux/iommu.h new file mode 100644 index 000000000000..796402174d6c --- /dev/null +++ b/include/uapi/linux/iommu.h @@ -0,0 +1,118 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +/* + * IOMMU user API definitions + */ + +#ifndef _UAPI_IOMMU_H +#define _UAPI_IOMMU_H + +#include + +#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 */ -- cgit v1.2.3