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Joerg Roedeldb3c33c2011-09-27 15:57:13 +02001/*
2 * drivers/pci/ats.c
3 *
4 * Copyright (C) 2009 Intel Corporation, Yu Zhao <yu.zhao@intel.com>
Joerg Roedelc320b972011-09-27 15:57:15 +02005 * Copyright (C) 2011 Advanced Micro Devices,
Joerg Roedeldb3c33c2011-09-27 15:57:13 +02006 *
7 * PCI Express I/O Virtualization (IOV) support.
8 * Address Translation Service 1.0
Joerg Roedelc320b972011-09-27 15:57:15 +02009 * Page Request Interface added by Joerg Roedel <joerg.roedel@amd.com>
Joerg Roedel086ac112011-09-27 15:57:16 +020010 * PASID support added by Joerg Roedel <joerg.roedel@amd.com>
Joerg Roedeldb3c33c2011-09-27 15:57:13 +020011 */
12
Paul Gortmaker363c75d2011-05-27 09:37:25 -040013#include <linux/export.h>
Joerg Roedeldb3c33c2011-09-27 15:57:13 +020014#include <linux/pci-ats.h>
15#include <linux/pci.h>
James Bottomley8c451942011-11-29 19:20:23 +000016#include <linux/slab.h>
Joerg Roedeldb3c33c2011-09-27 15:57:13 +020017
18#include "pci.h"
19
20static int ats_alloc_one(struct pci_dev *dev, int ps)
21{
22 int pos;
23 u16 cap;
24 struct pci_ats *ats;
25
26 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ATS);
27 if (!pos)
28 return -ENODEV;
29
30 ats = kzalloc(sizeof(*ats), GFP_KERNEL);
31 if (!ats)
32 return -ENOMEM;
33
34 ats->pos = pos;
35 ats->stu = ps;
36 pci_read_config_word(dev, pos + PCI_ATS_CAP, &cap);
37 ats->qdep = PCI_ATS_CAP_QDEP(cap) ? PCI_ATS_CAP_QDEP(cap) :
38 PCI_ATS_MAX_QDEP;
39 dev->ats = ats;
40
41 return 0;
42}
43
44static void ats_free_one(struct pci_dev *dev)
45{
46 kfree(dev->ats);
47 dev->ats = NULL;
48}
49
50/**
51 * pci_enable_ats - enable the ATS capability
52 * @dev: the PCI device
53 * @ps: the IOMMU page shift
54 *
55 * Returns 0 on success, or negative on failure.
56 */
57int pci_enable_ats(struct pci_dev *dev, int ps)
58{
59 int rc;
60 u16 ctrl;
61
62 BUG_ON(dev->ats && dev->ats->is_enabled);
63
64 if (ps < PCI_ATS_MIN_STU)
65 return -EINVAL;
66
67 if (dev->is_physfn || dev->is_virtfn) {
68 struct pci_dev *pdev = dev->is_physfn ? dev : dev->physfn;
69
70 mutex_lock(&pdev->sriov->lock);
71 if (pdev->ats)
72 rc = pdev->ats->stu == ps ? 0 : -EINVAL;
73 else
74 rc = ats_alloc_one(pdev, ps);
75
76 if (!rc)
77 pdev->ats->ref_cnt++;
78 mutex_unlock(&pdev->sriov->lock);
79 if (rc)
80 return rc;
81 }
82
83 if (!dev->is_physfn) {
84 rc = ats_alloc_one(dev, ps);
85 if (rc)
86 return rc;
87 }
88
89 ctrl = PCI_ATS_CTRL_ENABLE;
90 if (!dev->is_virtfn)
91 ctrl |= PCI_ATS_CTRL_STU(ps - PCI_ATS_MIN_STU);
92 pci_write_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, ctrl);
93
94 dev->ats->is_enabled = 1;
95
96 return 0;
97}
Joerg Roedeld4c06362011-09-27 15:57:14 +020098EXPORT_SYMBOL_GPL(pci_enable_ats);
Joerg Roedeldb3c33c2011-09-27 15:57:13 +020099
100/**
101 * pci_disable_ats - disable the ATS capability
102 * @dev: the PCI device
103 */
104void pci_disable_ats(struct pci_dev *dev)
105{
106 u16 ctrl;
107
108 BUG_ON(!dev->ats || !dev->ats->is_enabled);
109
110 pci_read_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, &ctrl);
111 ctrl &= ~PCI_ATS_CTRL_ENABLE;
112 pci_write_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, ctrl);
113
114 dev->ats->is_enabled = 0;
115
116 if (dev->is_physfn || dev->is_virtfn) {
117 struct pci_dev *pdev = dev->is_physfn ? dev : dev->physfn;
118
119 mutex_lock(&pdev->sriov->lock);
120 pdev->ats->ref_cnt--;
121 if (!pdev->ats->ref_cnt)
122 ats_free_one(pdev);
123 mutex_unlock(&pdev->sriov->lock);
124 }
125
126 if (!dev->is_physfn)
127 ats_free_one(dev);
128}
Joerg Roedeld4c06362011-09-27 15:57:14 +0200129EXPORT_SYMBOL_GPL(pci_disable_ats);
Joerg Roedeldb3c33c2011-09-27 15:57:13 +0200130
Hao, Xudong1900ca12011-12-17 21:24:40 +0800131void pci_restore_ats_state(struct pci_dev *dev)
132{
133 u16 ctrl;
134
135 if (!pci_ats_enabled(dev))
136 return;
137 if (!pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ATS))
138 BUG();
139
140 ctrl = PCI_ATS_CTRL_ENABLE;
141 if (!dev->is_virtfn)
142 ctrl |= PCI_ATS_CTRL_STU(dev->ats->stu - PCI_ATS_MIN_STU);
143
144 pci_write_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, ctrl);
145}
146EXPORT_SYMBOL_GPL(pci_restore_ats_state);
147
Joerg Roedeldb3c33c2011-09-27 15:57:13 +0200148/**
149 * pci_ats_queue_depth - query the ATS Invalidate Queue Depth
150 * @dev: the PCI device
151 *
152 * Returns the queue depth on success, or negative on failure.
153 *
154 * The ATS spec uses 0 in the Invalidate Queue Depth field to
155 * indicate that the function can accept 32 Invalidate Request.
156 * But here we use the `real' values (i.e. 1~32) for the Queue
157 * Depth; and 0 indicates the function shares the Queue with
158 * other functions (doesn't exclusively own a Queue).
159 */
160int pci_ats_queue_depth(struct pci_dev *dev)
161{
162 int pos;
163 u16 cap;
164
165 if (dev->is_virtfn)
166 return 0;
167
168 if (dev->ats)
169 return dev->ats->qdep;
170
171 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ATS);
172 if (!pos)
173 return -ENODEV;
174
175 pci_read_config_word(dev, pos + PCI_ATS_CAP, &cap);
176
177 return PCI_ATS_CAP_QDEP(cap) ? PCI_ATS_CAP_QDEP(cap) :
178 PCI_ATS_MAX_QDEP;
179}
Joerg Roedeld4c06362011-09-27 15:57:14 +0200180EXPORT_SYMBOL_GPL(pci_ats_queue_depth);
Joerg Roedelc320b972011-09-27 15:57:15 +0200181
182#ifdef CONFIG_PCI_PRI
183/**
184 * pci_enable_pri - Enable PRI capability
185 * @ pdev: PCI device structure
186 *
187 * Returns 0 on success, negative value on error
188 */
189int pci_enable_pri(struct pci_dev *pdev, u32 reqs)
190{
191 u16 control, status;
192 u32 max_requests;
193 int pos;
194
Alex Williamson69166fb2011-11-02 14:07:15 -0600195 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI);
Joerg Roedelc320b972011-09-27 15:57:15 +0200196 if (!pos)
197 return -EINVAL;
198
Alex Williamson91f57d52011-11-11 10:07:36 -0700199 pci_read_config_word(pdev, pos + PCI_PRI_CTRL, &control);
200 pci_read_config_word(pdev, pos + PCI_PRI_STATUS, &status);
201 if ((control & PCI_PRI_CTRL_ENABLE) ||
202 !(status & PCI_PRI_STATUS_STOPPED))
Joerg Roedelc320b972011-09-27 15:57:15 +0200203 return -EBUSY;
204
Alex Williamson91f57d52011-11-11 10:07:36 -0700205 pci_read_config_dword(pdev, pos + PCI_PRI_MAX_REQ, &max_requests);
Joerg Roedelc320b972011-09-27 15:57:15 +0200206 reqs = min(max_requests, reqs);
Alex Williamson91f57d52011-11-11 10:07:36 -0700207 pci_write_config_dword(pdev, pos + PCI_PRI_ALLOC_REQ, reqs);
Joerg Roedelc320b972011-09-27 15:57:15 +0200208
Alex Williamson91f57d52011-11-11 10:07:36 -0700209 control |= PCI_PRI_CTRL_ENABLE;
210 pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control);
Joerg Roedelc320b972011-09-27 15:57:15 +0200211
212 return 0;
213}
214EXPORT_SYMBOL_GPL(pci_enable_pri);
215
216/**
217 * pci_disable_pri - Disable PRI capability
218 * @pdev: PCI device structure
219 *
220 * Only clears the enabled-bit, regardless of its former value
221 */
222void pci_disable_pri(struct pci_dev *pdev)
223{
224 u16 control;
225 int pos;
226
Alex Williamson69166fb2011-11-02 14:07:15 -0600227 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI);
Joerg Roedelc320b972011-09-27 15:57:15 +0200228 if (!pos)
229 return;
230
Alex Williamson91f57d52011-11-11 10:07:36 -0700231 pci_read_config_word(pdev, pos + PCI_PRI_CTRL, &control);
232 control &= ~PCI_PRI_CTRL_ENABLE;
233 pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control);
Joerg Roedelc320b972011-09-27 15:57:15 +0200234}
235EXPORT_SYMBOL_GPL(pci_disable_pri);
236
237/**
Joerg Roedelc320b972011-09-27 15:57:15 +0200238 * pci_reset_pri - Resets device's PRI state
239 * @pdev: PCI device structure
240 *
241 * The PRI capability must be disabled before this function is called.
242 * Returns 0 on success, negative value on error.
243 */
244int pci_reset_pri(struct pci_dev *pdev)
245{
246 u16 control;
247 int pos;
248
Alex Williamson69166fb2011-11-02 14:07:15 -0600249 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI);
Joerg Roedelc320b972011-09-27 15:57:15 +0200250 if (!pos)
251 return -EINVAL;
252
Alex Williamson91f57d52011-11-11 10:07:36 -0700253 pci_read_config_word(pdev, pos + PCI_PRI_CTRL, &control);
254 if (control & PCI_PRI_CTRL_ENABLE)
Joerg Roedelc320b972011-09-27 15:57:15 +0200255 return -EBUSY;
256
Alex Williamson91f57d52011-11-11 10:07:36 -0700257 control |= PCI_PRI_CTRL_RESET;
Joerg Roedelc320b972011-09-27 15:57:15 +0200258
Alex Williamson91f57d52011-11-11 10:07:36 -0700259 pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control);
Joerg Roedelc320b972011-09-27 15:57:15 +0200260
261 return 0;
262}
263EXPORT_SYMBOL_GPL(pci_reset_pri);
Joerg Roedelc320b972011-09-27 15:57:15 +0200264#endif /* CONFIG_PCI_PRI */
Joerg Roedel086ac112011-09-27 15:57:16 +0200265
266#ifdef CONFIG_PCI_PASID
267/**
268 * pci_enable_pasid - Enable the PASID capability
269 * @pdev: PCI device structure
270 * @features: Features to enable
271 *
272 * Returns 0 on success, negative value on error. This function checks
273 * whether the features are actually supported by the device and returns
274 * an error if not.
275 */
276int pci_enable_pasid(struct pci_dev *pdev, int features)
277{
278 u16 control, supported;
279 int pos;
280
Alex Williamson69166fb2011-11-02 14:07:15 -0600281 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID);
Joerg Roedel086ac112011-09-27 15:57:16 +0200282 if (!pos)
283 return -EINVAL;
284
Alex Williamson91f57d52011-11-11 10:07:36 -0700285 pci_read_config_word(pdev, pos + PCI_PASID_CTRL, &control);
286 pci_read_config_word(pdev, pos + PCI_PASID_CAP, &supported);
Joerg Roedel086ac112011-09-27 15:57:16 +0200287
Alex Williamson91f57d52011-11-11 10:07:36 -0700288 if (control & PCI_PASID_CTRL_ENABLE)
Joerg Roedel086ac112011-09-27 15:57:16 +0200289 return -EINVAL;
290
Alex Williamson91f57d52011-11-11 10:07:36 -0700291 supported &= PCI_PASID_CAP_EXEC | PCI_PASID_CAP_PRIV;
Joerg Roedel086ac112011-09-27 15:57:16 +0200292
293 /* User wants to enable anything unsupported? */
294 if ((supported & features) != features)
295 return -EINVAL;
296
Alex Williamson91f57d52011-11-11 10:07:36 -0700297 control = PCI_PASID_CTRL_ENABLE | features;
Joerg Roedel086ac112011-09-27 15:57:16 +0200298
Alex Williamson91f57d52011-11-11 10:07:36 -0700299 pci_write_config_word(pdev, pos + PCI_PASID_CTRL, control);
Joerg Roedel086ac112011-09-27 15:57:16 +0200300
301 return 0;
302}
303EXPORT_SYMBOL_GPL(pci_enable_pasid);
304
305/**
306 * pci_disable_pasid - Disable the PASID capability
307 * @pdev: PCI device structure
308 *
309 */
310void pci_disable_pasid(struct pci_dev *pdev)
311{
312 u16 control = 0;
313 int pos;
314
Alex Williamson69166fb2011-11-02 14:07:15 -0600315 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID);
Joerg Roedel086ac112011-09-27 15:57:16 +0200316 if (!pos)
317 return;
318
Alex Williamson91f57d52011-11-11 10:07:36 -0700319 pci_write_config_word(pdev, pos + PCI_PASID_CTRL, control);
Joerg Roedel086ac112011-09-27 15:57:16 +0200320}
321EXPORT_SYMBOL_GPL(pci_disable_pasid);
322
323/**
324 * pci_pasid_features - Check which PASID features are supported
325 * @pdev: PCI device structure
326 *
327 * Returns a negative value when no PASI capability is present.
328 * Otherwise is returns a bitmask with supported features. Current
329 * features reported are:
Alex Williamson91f57d52011-11-11 10:07:36 -0700330 * PCI_PASID_CAP_EXEC - Execute permission supported
Bjorn Helgaasf7625982013-11-14 11:28:18 -0700331 * PCI_PASID_CAP_PRIV - Privileged mode supported
Joerg Roedel086ac112011-09-27 15:57:16 +0200332 */
333int pci_pasid_features(struct pci_dev *pdev)
334{
335 u16 supported;
336 int pos;
337
Alex Williamson69166fb2011-11-02 14:07:15 -0600338 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID);
Joerg Roedel086ac112011-09-27 15:57:16 +0200339 if (!pos)
340 return -EINVAL;
341
Alex Williamson91f57d52011-11-11 10:07:36 -0700342 pci_read_config_word(pdev, pos + PCI_PASID_CAP, &supported);
Joerg Roedel086ac112011-09-27 15:57:16 +0200343
Alex Williamson91f57d52011-11-11 10:07:36 -0700344 supported &= PCI_PASID_CAP_EXEC | PCI_PASID_CAP_PRIV;
Joerg Roedel086ac112011-09-27 15:57:16 +0200345
346 return supported;
347}
348EXPORT_SYMBOL_GPL(pci_pasid_features);
349
350#define PASID_NUMBER_SHIFT 8
351#define PASID_NUMBER_MASK (0x1f << PASID_NUMBER_SHIFT)
352/**
353 * pci_max_pasid - Get maximum number of PASIDs supported by device
354 * @pdev: PCI device structure
355 *
356 * Returns negative value when PASID capability is not present.
357 * Otherwise it returns the numer of supported PASIDs.
358 */
359int pci_max_pasids(struct pci_dev *pdev)
360{
361 u16 supported;
362 int pos;
363
Alex Williamson69166fb2011-11-02 14:07:15 -0600364 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID);
Joerg Roedel086ac112011-09-27 15:57:16 +0200365 if (!pos)
366 return -EINVAL;
367
Alex Williamson91f57d52011-11-11 10:07:36 -0700368 pci_read_config_word(pdev, pos + PCI_PASID_CAP, &supported);
Joerg Roedel086ac112011-09-27 15:57:16 +0200369
370 supported = (supported & PASID_NUMBER_MASK) >> PASID_NUMBER_SHIFT;
371
372 return (1 << supported);
373}
374EXPORT_SYMBOL_GPL(pci_max_pasids);
375#endif /* CONFIG_PCI_PASID */