[linux-2.6-block.git] / include / linux / amd-iommu.h

/*
 * 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_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
 */
#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);

/**
 * 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.
 */
#define AMD_IOMMU_INV_PRI_RSP_SUCCESS	0
#define AMD_IOMMU_INV_PRI_RSP_INVALID	1
#define AMD_IOMMU_INV_PRI_RSP_FAIL	2

typedef int (*amd_iommu_invalid_ppr_cb)(struct pci_dev *pdev,
					int pasid,
					unsigned long address,
					u16);

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);

#else

static inline int amd_iommu_detect(void) { return -ENODEV; }

#endif

#endif /* _ASM_X86_AMD_IOMMU_H */
Commit	Line	Data
c6da992e	1	/*
5d0d7156	2	* Copyright (C) 2007-2010 Advanced Micro Devices, Inc.
c6da992e JR	3	* Author: Joerg Roedel <joerg.roedel@amd.com>
	4	* Leo Duran <leo.duran@amd.com>
	5	*
	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.
	9	*
	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.
	14	*
	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
	18	*/
	19
1965aae3 PA	20	#ifndef _ASM_X86_AMD_IOMMU_H
1965aae3 PA	21	#define _ASM_X86_AMD_IOMMU_H
c6da992e	22
ed96f228	23	#include <linux/types.h>
c6da992e JR	24
c6da992e JR	25	#ifdef CONFIG_AMD_IOMMU
6a9401a7	26
2d5503b6	27	struct task_struct;
ed96f228 JR	28	struct pci_dev;
ed96f228 JR	29
480125ba	30	extern int amd_iommu_detect(void);
8704a1ba	31	extern int amd_iommu_init_hardware(void);
6a113ddc JR	32
	33	/**
	34	* amd_iommu_enable_device_erratum() - Enable erratum workaround for device
	35	* in the IOMMUv2 driver
	36	* @pdev: The PCI device the workaround is necessary for
	37	* @erratum: The erratum workaround to enable
	38	*
ed96f228	39	* The function needs to be called before amd_iommu_init_device().
6a113ddc JR	40	* Possible values for the erratum number are for now:
	41	* - AMD_PRI_DEV_ERRATUM_ENABLE_RESET - Reset PRI capability when PRI
	42	* is enabled
	43	* - AMD_PRI_DEV_ERRATUM_LIMIT_REQ_ONE - Limit number of outstanding PRI
	44	* requests to one
	45	*/
	46	#define AMD_PRI_DEV_ERRATUM_ENABLE_RESET 0
	47	#define AMD_PRI_DEV_ERRATUM_LIMIT_REQ_ONE 1
	48
	49	extern void amd_iommu_enable_device_erratum(struct pci_dev *pdev, u32 erratum);
	50
ed96f228 JR	51	/**
	52	* amd_iommu_init_device() - Init device for use with IOMMUv2 driver
	53	* @pdev: The PCI device to initialize
	54	* @pasids: Number of PASIDs to support for this device
	55	*
	56	* This function does all setup for the device pdev so that it can be
	57	* used with IOMMUv2.
	58	* Returns 0 on success or negative value on error.
	59	*/
	60	extern int amd_iommu_init_device(struct pci_dev *pdev, int pasids);
	61
	62	/**
	63	* amd_iommu_free_device() - Free all IOMMUv2 related device resources
	64	* and disable IOMMUv2 usage for this device
	65	* @pdev: The PCI device to disable IOMMUv2 usage for'
	66	*/
	67	extern void amd_iommu_free_device(struct pci_dev *pdev);
	68
2d5503b6 JR	69	/**
	70	* amd_iommu_bind_pasid() - Bind a given task to a PASID on a device
	71	* @pdev: The PCI device to bind the task to
	72	* @pasid: The PASID on the device the task should be bound to
	73	* @task: the task to bind
	74	*
	75	* The function returns 0 on success or a negative value on error.
	76	*/
	77	extern int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
	78	struct task_struct *task);
	79
	80	/**
	81	* amd_iommu_unbind_pasid() - Unbind a PASID from its task on
	82	* a device
	83	* @pdev: The device of the PASID
	84	* @pasid: The PASID to unbind
	85	*
	86	* When this function returns the device is no longer using the PASID
	87	* and the PASID is no longer bound to its task.
	88	*/
	89	extern void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid);
	90
175d6146 JR	91	/**
	92	* amd_iommu_set_invalid_ppr_cb() - Register a call-back for failed
	93	* PRI requests
	94	* @pdev: The PCI device the call-back should be registered for
	95	* @cb: The call-back function
	96	*
	97	* The IOMMUv2 driver invokes this call-back when it is unable to
	98	* successfully handle a PRI request. The device driver can then decide
	99	* which PRI response the device should see. Possible return values for
	100	* the call-back are:
	101	*
	102	* - AMD_IOMMU_INV_PRI_RSP_SUCCESS - Send SUCCESS back to the device
	103	* - AMD_IOMMU_INV_PRI_RSP_INVALID - Send INVALID back to the device
	104	* - AMD_IOMMU_INV_PRI_RSP_FAIL - Send Failure back to the device,
	105	* the device is required to disable
	106	* PRI when it receives this response
	107	*
	108	* The function returns 0 on success or negative value on error.
	109	*/
	110	#define AMD_IOMMU_INV_PRI_RSP_SUCCESS 0
	111	#define AMD_IOMMU_INV_PRI_RSP_INVALID 1
	112	#define AMD_IOMMU_INV_PRI_RSP_FAIL 2
	113
	114	typedef int (amd_iommu_invalid_ppr_cb)(struct pci_dev pdev,
	115	int pasid,
	116	unsigned long address,
	117	u16);
	118
	119	extern int amd_iommu_set_invalid_ppr_cb(struct pci_dev *pdev,
	120	amd_iommu_invalid_ppr_cb cb);
	121
51499aa9 AS	122	#define PPR_FAULT_EXEC (1 << 1)
	123	#define PPR_FAULT_READ (1 << 2)
	124	#define PPR_FAULT_WRITE (1 << 5)
	125	#define PPR_FAULT_USER (1 << 6)
	126	#define PPR_FAULT_RSVD (1 << 7)
	127	#define PPR_FAULT_GN (1 << 8)
	128
52efdb89 JR	129	/**
	130	* amd_iommu_device_info() - Get information about IOMMUv2 support of a
	131	* PCI device
	132	* @pdev: PCI device to query information from
	133	* @info: A pointer to an amd_iommu_device_info structure which will contain
	134	* the information about the PCI device
	135	*
	136	* Returns 0 on success, negative value on error
	137	*/
	138
	139	#define AMD_IOMMU_DEVICE_FLAG_ATS_SUP 0x1 /* ATS feature supported */
	140	#define AMD_IOMMU_DEVICE_FLAG_PRI_SUP 0x2 /* PRI feature supported */
	141	#define AMD_IOMMU_DEVICE_FLAG_PASID_SUP 0x4 /* PASID context supported */
	142	#define AMD_IOMMU_DEVICE_FLAG_EXEC_SUP 0x8 /* Device may request execution
	143	on memory pages */
	144	#define AMD_IOMMU_DEVICE_FLAG_PRIV_SUP 0x10 /* Device may request
	145	super-user privileges */
	146
	147	struct amd_iommu_device_info {
	148	int max_pasids;
	149	u32 flags;
	150	};
	151
	152	extern int amd_iommu_device_info(struct pci_dev *pdev,
	153	struct amd_iommu_device_info *info);
	154
bc21662f JR	155	/**
	156	* amd_iommu_set_invalidate_ctx_cb() - Register a call-back for invalidating
	157	* a pasid context. This call-back is
	158	* invoked when the IOMMUv2 driver needs to
	159	* invalidate a PASID context, for example
	160	* because the task that is bound to that
	161	* context is about to exit.
	162	*
	163	* @pdev: The PCI device the call-back should be registered for
	164	* @cb: The call-back function
	165	*/
	166
	167	typedef void (amd_iommu_invalidate_ctx)(struct pci_dev pdev, int pasid);
	168
	169	extern int amd_iommu_set_invalidate_ctx_cb(struct pci_dev *pdev,
	170	amd_iommu_invalidate_ctx cb);
	171
c6da992e	172	#else
6a9401a7	173
480125ba	174	static inline int amd_iommu_detect(void) { return -ENODEV; }
6a9401a7	175
c6da992e JR	176	#endif
c6da992e JR	177
1965aae3	178	#endif /* _ASM_X86_AMD_IOMMU_H */