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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - drivers/pci/ats.c
4 * Copyright (C) 2009 Intel Corporation, Yu Zhao <yu.zhao@intel.com>
5 * Copyright (C) 2011 Advanced Micro Devices,
7 * PCI Express I/O Virtualization (IOV) support.
8 * Address Translation Service 1.0
9 * Page Request Interface added by Joerg Roedel <joerg.roedel@amd.com>
10 * PASID support added by Joerg Roedel <joerg.roedel@amd.com>
13 #include <linux/export.h>
14 #include <linux/pci-ats.h>
15 #include <linux/pci.h>
16 #include <linux/slab.h>
20 void pci_ats_init(struct pci_dev
*dev
)
24 pos
= pci_find_ext_capability(dev
, PCI_EXT_CAP_ID_ATS
);
32 * pci_enable_ats - enable the ATS capability
33 * @dev: the PCI device
34 * @ps: the IOMMU page shift
36 * Returns 0 on success, or negative on failure.
38 int pci_enable_ats(struct pci_dev
*dev
, int ps
)
46 if (WARN_ON(dev
->ats_enabled
))
49 if (ps
< PCI_ATS_MIN_STU
)
53 * Note that enabling ATS on a VF fails unless it's already enabled
54 * with the same STU on the PF.
56 ctrl
= PCI_ATS_CTRL_ENABLE
;
58 pdev
= pci_physfn(dev
);
59 if (pdev
->ats_stu
!= ps
)
62 atomic_inc(&pdev
->ats_ref_cnt
); /* count enabled VFs */
65 ctrl
|= PCI_ATS_CTRL_STU(dev
->ats_stu
- PCI_ATS_MIN_STU
);
67 pci_write_config_word(dev
, dev
->ats_cap
+ PCI_ATS_CTRL
, ctrl
);
72 EXPORT_SYMBOL_GPL(pci_enable_ats
);
75 * pci_disable_ats - disable the ATS capability
76 * @dev: the PCI device
78 void pci_disable_ats(struct pci_dev
*dev
)
83 if (WARN_ON(!dev
->ats_enabled
))
86 if (atomic_read(&dev
->ats_ref_cnt
))
87 return; /* VFs still enabled */
90 pdev
= pci_physfn(dev
);
91 atomic_dec(&pdev
->ats_ref_cnt
);
94 pci_read_config_word(dev
, dev
->ats_cap
+ PCI_ATS_CTRL
, &ctrl
);
95 ctrl
&= ~PCI_ATS_CTRL_ENABLE
;
96 pci_write_config_word(dev
, dev
->ats_cap
+ PCI_ATS_CTRL
, ctrl
);
100 EXPORT_SYMBOL_GPL(pci_disable_ats
);
102 void pci_restore_ats_state(struct pci_dev
*dev
)
106 if (!dev
->ats_enabled
)
109 ctrl
= PCI_ATS_CTRL_ENABLE
;
111 ctrl
|= PCI_ATS_CTRL_STU(dev
->ats_stu
- PCI_ATS_MIN_STU
);
112 pci_write_config_word(dev
, dev
->ats_cap
+ PCI_ATS_CTRL
, ctrl
);
114 EXPORT_SYMBOL_GPL(pci_restore_ats_state
);
117 * pci_ats_queue_depth - query the ATS Invalidate Queue Depth
118 * @dev: the PCI device
120 * Returns the queue depth on success, or negative on failure.
122 * The ATS spec uses 0 in the Invalidate Queue Depth field to
123 * indicate that the function can accept 32 Invalidate Request.
124 * But here we use the `real' values (i.e. 1~32) for the Queue
125 * Depth; and 0 indicates the function shares the Queue with
126 * other functions (doesn't exclusively own a Queue).
128 int pci_ats_queue_depth(struct pci_dev
*dev
)
138 pci_read_config_word(dev
, dev
->ats_cap
+ PCI_ATS_CAP
, &cap
);
139 return PCI_ATS_CAP_QDEP(cap
) ? PCI_ATS_CAP_QDEP(cap
) : PCI_ATS_MAX_QDEP
;
141 EXPORT_SYMBOL_GPL(pci_ats_queue_depth
);
143 #ifdef CONFIG_PCI_PRI
145 * pci_enable_pri - Enable PRI capability
146 * @ pdev: PCI device structure
148 * Returns 0 on success, negative value on error
150 int pci_enable_pri(struct pci_dev
*pdev
, u32 reqs
)
156 pos
= pci_find_ext_capability(pdev
, PCI_EXT_CAP_ID_PRI
);
160 pci_read_config_word(pdev
, pos
+ PCI_PRI_CTRL
, &control
);
161 pci_read_config_word(pdev
, pos
+ PCI_PRI_STATUS
, &status
);
162 if ((control
& PCI_PRI_CTRL_ENABLE
) ||
163 !(status
& PCI_PRI_STATUS_STOPPED
))
166 pci_read_config_dword(pdev
, pos
+ PCI_PRI_MAX_REQ
, &max_requests
);
167 reqs
= min(max_requests
, reqs
);
168 pci_write_config_dword(pdev
, pos
+ PCI_PRI_ALLOC_REQ
, reqs
);
170 control
|= PCI_PRI_CTRL_ENABLE
;
171 pci_write_config_word(pdev
, pos
+ PCI_PRI_CTRL
, control
);
175 EXPORT_SYMBOL_GPL(pci_enable_pri
);
178 * pci_disable_pri - Disable PRI capability
179 * @pdev: PCI device structure
181 * Only clears the enabled-bit, regardless of its former value
183 void pci_disable_pri(struct pci_dev
*pdev
)
188 pos
= pci_find_ext_capability(pdev
, PCI_EXT_CAP_ID_PRI
);
192 pci_read_config_word(pdev
, pos
+ PCI_PRI_CTRL
, &control
);
193 control
&= ~PCI_PRI_CTRL_ENABLE
;
194 pci_write_config_word(pdev
, pos
+ PCI_PRI_CTRL
, control
);
196 EXPORT_SYMBOL_GPL(pci_disable_pri
);
199 * pci_reset_pri - Resets device's PRI state
200 * @pdev: PCI device structure
202 * The PRI capability must be disabled before this function is called.
203 * Returns 0 on success, negative value on error.
205 int pci_reset_pri(struct pci_dev
*pdev
)
210 pos
= pci_find_ext_capability(pdev
, PCI_EXT_CAP_ID_PRI
);
214 pci_read_config_word(pdev
, pos
+ PCI_PRI_CTRL
, &control
);
215 if (control
& PCI_PRI_CTRL_ENABLE
)
218 control
|= PCI_PRI_CTRL_RESET
;
220 pci_write_config_word(pdev
, pos
+ PCI_PRI_CTRL
, control
);
224 EXPORT_SYMBOL_GPL(pci_reset_pri
);
225 #endif /* CONFIG_PCI_PRI */
227 #ifdef CONFIG_PCI_PASID
229 * pci_enable_pasid - Enable the PASID capability
230 * @pdev: PCI device structure
231 * @features: Features to enable
233 * Returns 0 on success, negative value on error. This function checks
234 * whether the features are actually supported by the device and returns
237 int pci_enable_pasid(struct pci_dev
*pdev
, int features
)
239 u16 control
, supported
;
242 pos
= pci_find_ext_capability(pdev
, PCI_EXT_CAP_ID_PASID
);
246 pci_read_config_word(pdev
, pos
+ PCI_PASID_CTRL
, &control
);
247 pci_read_config_word(pdev
, pos
+ PCI_PASID_CAP
, &supported
);
249 if (control
& PCI_PASID_CTRL_ENABLE
)
252 supported
&= PCI_PASID_CAP_EXEC
| PCI_PASID_CAP_PRIV
;
254 /* User wants to enable anything unsupported? */
255 if ((supported
& features
) != features
)
258 control
= PCI_PASID_CTRL_ENABLE
| features
;
260 pci_write_config_word(pdev
, pos
+ PCI_PASID_CTRL
, control
);
264 EXPORT_SYMBOL_GPL(pci_enable_pasid
);
267 * pci_disable_pasid - Disable the PASID capability
268 * @pdev: PCI device structure
271 void pci_disable_pasid(struct pci_dev
*pdev
)
276 pos
= pci_find_ext_capability(pdev
, PCI_EXT_CAP_ID_PASID
);
280 pci_write_config_word(pdev
, pos
+ PCI_PASID_CTRL
, control
);
282 EXPORT_SYMBOL_GPL(pci_disable_pasid
);
285 * pci_pasid_features - Check which PASID features are supported
286 * @pdev: PCI device structure
288 * Returns a negative value when no PASI capability is present.
289 * Otherwise is returns a bitmask with supported features. Current
290 * features reported are:
291 * PCI_PASID_CAP_EXEC - Execute permission supported
292 * PCI_PASID_CAP_PRIV - Privileged mode supported
294 int pci_pasid_features(struct pci_dev
*pdev
)
299 pos
= pci_find_ext_capability(pdev
, PCI_EXT_CAP_ID_PASID
);
303 pci_read_config_word(pdev
, pos
+ PCI_PASID_CAP
, &supported
);
305 supported
&= PCI_PASID_CAP_EXEC
| PCI_PASID_CAP_PRIV
;
309 EXPORT_SYMBOL_GPL(pci_pasid_features
);
311 #define PASID_NUMBER_SHIFT 8
312 #define PASID_NUMBER_MASK (0x1f << PASID_NUMBER_SHIFT)
314 * pci_max_pasid - Get maximum number of PASIDs supported by device
315 * @pdev: PCI device structure
317 * Returns negative value when PASID capability is not present.
318 * Otherwise it returns the numer of supported PASIDs.
320 int pci_max_pasids(struct pci_dev
*pdev
)
325 pos
= pci_find_ext_capability(pdev
, PCI_EXT_CAP_ID_PASID
);
329 pci_read_config_word(pdev
, pos
+ PCI_PASID_CAP
, &supported
);
331 supported
= (supported
& PASID_NUMBER_MASK
) >> PASID_NUMBER_SHIFT
;
333 return (1 << supported
);
335 EXPORT_SYMBOL_GPL(pci_max_pasids
);
336 #endif /* CONFIG_PCI_PASID */