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TOMOYO Linux Cross Reference
Linux/include/linux/amd-iommu.h

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  1 /*
  2  * Copyright (C) 2007-2010 Advanced Micro Devices, Inc.
  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 
 20 #ifndef _ASM_X86_AMD_IOMMU_H
 21 #define _ASM_X86_AMD_IOMMU_H
 22 
 23 #include <linux/types.h>
 24 
 25 /*
 26  * This is mainly used to communicate information back-and-forth
 27  * between SVM and IOMMU for setting up and tearing down posted
 28  * interrupt
 29  */
 30 struct amd_iommu_pi_data {
 31         u32 ga_tag;
 32         u32 prev_ga_tag;
 33         u64 base;
 34         bool is_guest_mode;
 35         struct vcpu_data *vcpu_data;
 36         void *ir_data;
 37 };
 38 
 39 #ifdef CONFIG_AMD_IOMMU
 40 
 41 struct task_struct;
 42 struct pci_dev;
 43 
 44 extern int amd_iommu_detect(void);
 45 extern int amd_iommu_init_hardware(void);
 46 
 47 /**
 48  * amd_iommu_enable_device_erratum() - Enable erratum workaround for device
 49  *                                     in the IOMMUv2 driver
 50  * @pdev: The PCI device the workaround is necessary for
 51  * @erratum: The erratum workaround to enable
 52  *
 53  * The function needs to be called before amd_iommu_init_device().
 54  * Possible values for the erratum number are for now:
 55  * - AMD_PRI_DEV_ERRATUM_ENABLE_RESET - Reset PRI capability when PRI
 56  *                                      is enabled
 57  * - AMD_PRI_DEV_ERRATUM_LIMIT_REQ_ONE - Limit number of outstanding PRI
 58  *                                       requests to one
 59  */
 60 #define AMD_PRI_DEV_ERRATUM_ENABLE_RESET                0
 61 #define AMD_PRI_DEV_ERRATUM_LIMIT_REQ_ONE               1
 62 
 63 extern void amd_iommu_enable_device_erratum(struct pci_dev *pdev, u32 erratum);
 64 
 65 /**
 66  * amd_iommu_init_device() - Init device for use with IOMMUv2 driver
 67  * @pdev: The PCI device to initialize
 68  * @pasids: Number of PASIDs to support for this device
 69  *
 70  * This function does all setup for the device pdev so that it can be
 71  * used with IOMMUv2.
 72  * Returns 0 on success or negative value on error.
 73  */
 74 extern int amd_iommu_init_device(struct pci_dev *pdev, int pasids);
 75 
 76 /**
 77  * amd_iommu_free_device() - Free all IOMMUv2 related device resources
 78  *                           and disable IOMMUv2 usage for this device
 79  * @pdev: The PCI device to disable IOMMUv2 usage for'
 80  */
 81 extern void amd_iommu_free_device(struct pci_dev *pdev);
 82 
 83 /**
 84  * amd_iommu_bind_pasid() - Bind a given task to a PASID on a device
 85  * @pdev: The PCI device to bind the task to
 86  * @pasid: The PASID on the device the task should be bound to
 87  * @task: the task to bind
 88  *
 89  * The function returns 0 on success or a negative value on error.
 90  */
 91 extern int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
 92                                 struct task_struct *task);
 93 
 94 /**
 95  * amd_iommu_unbind_pasid() - Unbind a PASID from its task on
 96  *                            a device
 97  * @pdev: The device of the PASID
 98  * @pasid: The PASID to unbind
 99  *
100  * When this function returns the device is no longer using the PASID
101  * and the PASID is no longer bound to its task.
102  */
103 extern void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid);
104 
105 /**
106  * amd_iommu_set_invalid_ppr_cb() - Register a call-back for failed
107  *                                  PRI requests
108  * @pdev: The PCI device the call-back should be registered for
109  * @cb: The call-back function
110  *
111  * The IOMMUv2 driver invokes this call-back when it is unable to
112  * successfully handle a PRI request. The device driver can then decide
113  * which PRI response the device should see. Possible return values for
114  * the call-back are:
115  *
116  * - AMD_IOMMU_INV_PRI_RSP_SUCCESS - Send SUCCESS back to the device
117  * - AMD_IOMMU_INV_PRI_RSP_INVALID - Send INVALID back to the device
118  * - AMD_IOMMU_INV_PRI_RSP_FAIL    - Send Failure back to the device,
119  *                                   the device is required to disable
120  *                                   PRI when it receives this response
121  *
122  * The function returns 0 on success or negative value on error.
123  */
124 #define AMD_IOMMU_INV_PRI_RSP_SUCCESS   0
125 #define AMD_IOMMU_INV_PRI_RSP_INVALID   1
126 #define AMD_IOMMU_INV_PRI_RSP_FAIL      2
127 
128 typedef int (*amd_iommu_invalid_ppr_cb)(struct pci_dev *pdev,
129                                         int pasid,
130                                         unsigned long address,
131                                         u16);
132 
133 extern int amd_iommu_set_invalid_ppr_cb(struct pci_dev *pdev,
134                                         amd_iommu_invalid_ppr_cb cb);
135 
136 #define PPR_FAULT_EXEC  (1 << 1)
137 #define PPR_FAULT_READ  (1 << 2)
138 #define PPR_FAULT_WRITE (1 << 5)
139 #define PPR_FAULT_USER  (1 << 6)
140 #define PPR_FAULT_RSVD  (1 << 7)
141 #define PPR_FAULT_GN    (1 << 8)
142 
143 /**
144  * amd_iommu_device_info() - Get information about IOMMUv2 support of a
145  *                           PCI device
146  * @pdev: PCI device to query information from
147  * @info: A pointer to an amd_iommu_device_info structure which will contain
148  *        the information about the PCI device
149  *
150  * Returns 0 on success, negative value on error
151  */
152 
153 #define AMD_IOMMU_DEVICE_FLAG_ATS_SUP     0x1    /* ATS feature supported */
154 #define AMD_IOMMU_DEVICE_FLAG_PRI_SUP     0x2    /* PRI feature supported */
155 #define AMD_IOMMU_DEVICE_FLAG_PASID_SUP   0x4    /* PASID context supported */
156 #define AMD_IOMMU_DEVICE_FLAG_EXEC_SUP    0x8    /* Device may request execution
157                                                     on memory pages */
158 #define AMD_IOMMU_DEVICE_FLAG_PRIV_SUP   0x10    /* Device may request
159                                                     super-user privileges */
160 
161 struct amd_iommu_device_info {
162         int max_pasids;
163         u32 flags;
164 };
165 
166 extern int amd_iommu_device_info(struct pci_dev *pdev,
167                                  struct amd_iommu_device_info *info);
168 
169 /**
170  * amd_iommu_set_invalidate_ctx_cb() - Register a call-back for invalidating
171  *                                     a pasid context. This call-back is
172  *                                     invoked when the IOMMUv2 driver needs to
173  *                                     invalidate a PASID context, for example
174  *                                     because the task that is bound to that
175  *                                     context is about to exit.
176  *
177  * @pdev: The PCI device the call-back should be registered for
178  * @cb: The call-back function
179  */
180 
181 typedef void (*amd_iommu_invalidate_ctx)(struct pci_dev *pdev, int pasid);
182 
183 extern int amd_iommu_set_invalidate_ctx_cb(struct pci_dev *pdev,
184                                            amd_iommu_invalidate_ctx cb);
185 #else /* CONFIG_AMD_IOMMU */
186 
187 static inline int amd_iommu_detect(void) { return -ENODEV; }
188 
189 #endif /* CONFIG_AMD_IOMMU */
190 
191 #if defined(CONFIG_AMD_IOMMU) && defined(CONFIG_IRQ_REMAP)
192 
193 /* IOMMU AVIC Function */
194 extern int amd_iommu_register_ga_log_notifier(int (*notifier)(u32));
195 
196 extern int
197 amd_iommu_update_ga(int cpu, bool is_run, void *data);
198 
199 #else /* defined(CONFIG_AMD_IOMMU) && defined(CONFIG_IRQ_REMAP) */
200 
201 static inline int
202 amd_iommu_register_ga_log_notifier(int (*notifier)(u32))
203 {
204         return 0;
205 }
206 
207 static inline int
208 amd_iommu_update_ga(int cpu, bool is_run, void *data)
209 {
210         return 0;
211 }
212 
213 #endif /* defined(CONFIG_AMD_IOMMU) && defined(CONFIG_IRQ_REMAP) */
214 
215 #endif /* _ASM_X86_AMD_IOMMU_H */
216 

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