2 * Copyright (C) 2007-2010 Advanced Micro Devices, Inc.
3 * Author: Joerg Roedel <joerg.roedel@amd.com>
4 * Leo Duran <leo.duran@amd.com>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #ifndef _ASM_X86_AMD_IOMMU_H
21 #define _ASM_X86_AMD_IOMMU_H
23 #include <linux/types.h>
25 #ifdef CONFIG_AMD_IOMMU
30 extern int amd_iommu_detect(void);
31 extern int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
32 struct task_struct *task);
33 extern void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid);
37 * amd_iommu_enable_device_erratum() - Enable erratum workaround for device
38 * in the IOMMUv2 driver
39 * @pdev: The PCI device the workaround is necessary for
40 * @erratum: The erratum workaround to enable
42 * The function needs to be called before amd_iommu_init_device().
43 * Possible values for the erratum number are for now:
44 * - AMD_PRI_DEV_ERRATUM_ENABLE_RESET - Reset PRI capability when PRI
46 * - AMD_PRI_DEV_ERRATUM_LIMIT_REQ_ONE - Limit number of outstanding PRI
49 #define AMD_PRI_DEV_ERRATUM_ENABLE_RESET 0
50 #define AMD_PRI_DEV_ERRATUM_LIMIT_REQ_ONE 1
52 extern void amd_iommu_enable_device_erratum(struct pci_dev *pdev, u32 erratum);
55 * amd_iommu_init_device() - Init device for use with IOMMUv2 driver
56 * @pdev: The PCI device to initialize
57 * @pasids: Number of PASIDs to support for this device
59 * This function does all setup for the device pdev so that it can be
61 * Returns 0 on success or negative value on error.
63 extern int amd_iommu_init_device(struct pci_dev *pdev, int pasids);
66 * amd_iommu_free_device() - Free all IOMMUv2 related device resources
67 * and disable IOMMUv2 usage for this device
68 * @pdev: The PCI device to disable IOMMUv2 usage for'
70 extern void amd_iommu_free_device(struct pci_dev *pdev);
73 * amd_iommu_bind_pasid() - Bind a given task to a PASID on a device
74 * @pdev: The PCI device to bind the task to
75 * @pasid: The PASID on the device the task should be bound to
76 * @task: the task to bind
78 * The function returns 0 on success or a negative value on error.
80 extern int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
81 struct task_struct *task);
84 * amd_iommu_unbind_pasid() - Unbind a PASID from its task on
86 * @pdev: The device of the PASID
87 * @pasid: The PASID to unbind
89 * When this function returns the device is no longer using the PASID
90 * and the PASID is no longer bound to its task.
92 extern void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid);
96 static inline int amd_iommu_detect(void) { return -ENODEV; }
100 #endif /* _ASM_X86_AMD_IOMMU_H */