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* Copyright (C) 2007-2010 Advanced Micro Devices, Inc.
* Author: Joerg Roedel <>
* Leo Duran <>
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#ifndef _ASM_X86_AMD_IOMMU_H
#define _ASM_X86_AMD_IOMMU_H
#include <linux/types.h>
struct task_struct;
struct pci_dev;
extern int amd_iommu_detect(void);
extern int amd_iommu_init_hardware(void);
* amd_iommu_enable_device_erratum() - Enable erratum workaround for device
* in the IOMMUv2 driver
* @pdev: The PCI device the workaround is necessary for
* @erratum: The erratum workaround to enable
* The function needs to be called before amd_iommu_init_device().
* Possible values for the erratum number are for now:
* - AMD_PRI_DEV_ERRATUM_ENABLE_RESET - Reset PRI capability when PRI
* is enabled
* - AMD_PRI_DEV_ERRATUM_LIMIT_REQ_ONE - Limit number of outstanding PRI
* requests to one
extern void amd_iommu_enable_device_erratum(struct pci_dev *pdev, u32 erratum);
* amd_iommu_init_device() - Init device for use with IOMMUv2 driver
* @pdev: The PCI device to initialize
* @pasids: Number of PASIDs to support for this device
* This function does all setup for the device pdev so that it can be
* used with IOMMUv2.
* Returns 0 on success or negative value on error.
extern int amd_iommu_init_device(struct pci_dev *pdev, int pasids);
* amd_iommu_free_device() - Free all IOMMUv2 related device resources
* and disable IOMMUv2 usage for this device
* @pdev: The PCI device to disable IOMMUv2 usage for'
extern void amd_iommu_free_device(struct pci_dev *pdev);
* amd_iommu_bind_pasid() - Bind a given task to a PASID on a device
* @pdev: The PCI device to bind the task to
* @pasid: The PASID on the device the task should be bound to
* @task: the task to bind
* The function returns 0 on success or a negative value on error.
extern int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
struct task_struct *task);
* amd_iommu_unbind_pasid() - Unbind a PASID from its task on
* a device
* @pdev: The device of the PASID
* @pasid: The PASID to unbind
* When this function returns the device is no longer using the PASID
* and the PASID is no longer bound to its task.
extern void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid);
* amd_iommu_set_invalid_ppr_cb() - Register a call-back for failed
* PRI requests
* @pdev: The PCI device the call-back should be registered for
* @cb: The call-back function
* The IOMMUv2 driver invokes this call-back when it is unable to
* successfully handle a PRI request. The device driver can then decide
* which PRI response the device should see. Possible return values for
* the call-back are:
* - AMD_IOMMU_INV_PRI_RSP_SUCCESS - Send SUCCESS back to the device
* - AMD_IOMMU_INV_PRI_RSP_INVALID - Send INVALID back to the device
* - AMD_IOMMU_INV_PRI_RSP_FAIL - Send Failure back to the device,
* the device is required to disable
* PRI when it receives this response
* The function returns 0 on success or negative value on error.
typedef int (*amd_iommu_invalid_ppr_cb)(struct pci_dev *pdev,
int pasid,
unsigned long address,
extern int amd_iommu_set_invalid_ppr_cb(struct pci_dev *pdev,
amd_iommu_invalid_ppr_cb cb);
#define PPR_FAULT_EXEC (1 << 1)
#define PPR_FAULT_READ (1 << 2)
#define PPR_FAULT_WRITE (1 << 5)
#define PPR_FAULT_USER (1 << 6)
#define PPR_FAULT_RSVD (1 << 7)
#define PPR_FAULT_GN (1 << 8)
* amd_iommu_device_info() - Get information about IOMMUv2 support of a
* PCI device
* @pdev: PCI device to query information from
* @info: A pointer to an amd_iommu_device_info structure which will contain
* the information about the PCI device
* Returns 0 on success, negative value on error
#define AMD_IOMMU_DEVICE_FLAG_ATS_SUP 0x1 /* ATS feature supported */
#define AMD_IOMMU_DEVICE_FLAG_PRI_SUP 0x2 /* PRI feature supported */
#define AMD_IOMMU_DEVICE_FLAG_PASID_SUP 0x4 /* PASID context supported */
#define AMD_IOMMU_DEVICE_FLAG_EXEC_SUP 0x8 /* Device may request execution
on memory pages */
#define AMD_IOMMU_DEVICE_FLAG_PRIV_SUP 0x10 /* Device may request
super-user privileges */
struct amd_iommu_device_info {
int max_pasids;
u32 flags;
extern int amd_iommu_device_info(struct pci_dev *pdev,
struct amd_iommu_device_info *info);
* amd_iommu_set_invalidate_ctx_cb() - Register a call-back for invalidating
* a pasid context. This call-back is
* invoked when the IOMMUv2 driver needs to
* invalidate a PASID context, for example
* because the task that is bound to that
* context is about to exit.
* @pdev: The PCI device the call-back should be registered for
* @cb: The call-back function
typedef void (*amd_iommu_invalidate_ctx)(struct pci_dev *pdev, int pasid);
extern int amd_iommu_set_invalidate_ctx_cb(struct pci_dev *pdev,
amd_iommu_invalidate_ctx cb);
static inline int amd_iommu_detect(void) { return -ENODEV; }
#endif /* _ASM_X86_AMD_IOMMU_H */