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/*
* Copyright (C) 2007-2010 Advanced Micro Devices, Inc.
* Author: Joerg Roedel <joerg.roedel@amd.com>
* Leo Duran <leo.duran@amd.com>
*
* 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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* 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>
#ifdef CONFIG_AMD_IOMMU
struct task_struct;
struct pci_dev;
extern int amd_iommu_detect(void);
extern int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
struct task_struct *task);
extern void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid);
/**
* 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
*/
#define AMD_PRI_DEV_ERRATUM_ENABLE_RESET 0
#define AMD_PRI_DEV_ERRATUM_LIMIT_REQ_ONE 1
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);
#else
static inline int amd_iommu_detect(void) { return -ENODEV; }
#endif
#endif /* _ASM_X86_AMD_IOMMU_H */
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