Commit | Line | Data |
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e62d9491 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
7589670f | 2 | /* |
211a22ce | 3 | * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved. |
7589670f SN |
4 | */ |
5 | ||
6 | /* | |
7 | * This driver supports an interface for DCA clients and providers to meet. | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/notifier.h> | |
12 | #include <linux/device.h> | |
13 | #include <linux/dca.h> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
d229807f | 15 | #include <linux/module.h> |
7589670f | 16 | |
1a5aeeec | 17 | #define DCA_VERSION "1.12.1" |
7589670f | 18 | |
7f1b358a MS |
19 | MODULE_VERSION(DCA_VERSION); |
20 | MODULE_LICENSE("GPL"); | |
21 | MODULE_AUTHOR("Intel Corporation"); | |
7589670f | 22 | |
a1741e7f | 23 | static DEFINE_RAW_SPINLOCK(dca_lock); |
7589670f | 24 | |
1a5aeeec | 25 | static LIST_HEAD(dca_domains); |
7f1b358a | 26 | |
4e8cec26 SM |
27 | static BLOCKING_NOTIFIER_HEAD(dca_provider_chain); |
28 | ||
29 | static int dca_providers_blocked; | |
30 | ||
1a5aeeec | 31 | static struct pci_bus *dca_pci_rc_from_dev(struct device *dev) |
7f1b358a | 32 | { |
1a5aeeec MS |
33 | struct pci_dev *pdev = to_pci_dev(dev); |
34 | struct pci_bus *bus = pdev->bus; | |
7f1b358a | 35 | |
1a5aeeec MS |
36 | while (bus->parent) |
37 | bus = bus->parent; | |
38 | ||
39 | return bus; | |
40 | } | |
41 | ||
42 | static struct dca_domain *dca_allocate_domain(struct pci_bus *rc) | |
43 | { | |
44 | struct dca_domain *domain; | |
45 | ||
46 | domain = kzalloc(sizeof(*domain), GFP_NOWAIT); | |
47 | if (!domain) | |
48 | return NULL; | |
49 | ||
50 | INIT_LIST_HEAD(&domain->dca_providers); | |
51 | domain->pci_rc = rc; | |
52 | ||
53 | return domain; | |
54 | } | |
55 | ||
56 | static void dca_free_domain(struct dca_domain *domain) | |
57 | { | |
58 | list_del(&domain->node); | |
59 | kfree(domain); | |
60 | } | |
61 | ||
4e8cec26 SM |
62 | static int dca_provider_ioat_ver_3_0(struct device *dev) |
63 | { | |
64 | struct pci_dev *pdev = to_pci_dev(dev); | |
65 | ||
66 | return ((pdev->vendor == PCI_VENDOR_ID_INTEL) && | |
67 | ((pdev->device == PCI_DEVICE_ID_INTEL_IOAT_TBG0) || | |
68 | (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_TBG1) || | |
69 | (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_TBG2) || | |
70 | (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_TBG3) || | |
71 | (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_TBG4) || | |
72 | (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_TBG5) || | |
73 | (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_TBG6) || | |
74 | (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_TBG7))); | |
75 | } | |
76 | ||
77 | static void unregister_dca_providers(void) | |
78 | { | |
79 | struct dca_provider *dca, *_dca; | |
80 | struct list_head unregistered_providers; | |
81 | struct dca_domain *domain; | |
82 | unsigned long flags; | |
83 | ||
84 | blocking_notifier_call_chain(&dca_provider_chain, | |
85 | DCA_PROVIDER_REMOVE, NULL); | |
86 | ||
87 | INIT_LIST_HEAD(&unregistered_providers); | |
88 | ||
a1741e7f | 89 | raw_spin_lock_irqsave(&dca_lock, flags); |
4e8cec26 SM |
90 | |
91 | if (list_empty(&dca_domains)) { | |
a1741e7f | 92 | raw_spin_unlock_irqrestore(&dca_lock, flags); |
4e8cec26 SM |
93 | return; |
94 | } | |
95 | ||
96 | /* at this point only one domain in the list is expected */ | |
97 | domain = list_first_entry(&dca_domains, struct dca_domain, node); | |
4e8cec26 | 98 | |
3bb598fb KS |
99 | list_for_each_entry_safe(dca, _dca, &domain->dca_providers, node) |
100 | list_move(&dca->node, &unregistered_providers); | |
4e8cec26 SM |
101 | |
102 | dca_free_domain(domain); | |
103 | ||
a1741e7f | 104 | raw_spin_unlock_irqrestore(&dca_lock, flags); |
4e8cec26 SM |
105 | |
106 | list_for_each_entry_safe(dca, _dca, &unregistered_providers, node) { | |
107 | dca_sysfs_remove_provider(dca); | |
108 | list_del(&dca->node); | |
109 | } | |
110 | } | |
111 | ||
1a5aeeec MS |
112 | static struct dca_domain *dca_find_domain(struct pci_bus *rc) |
113 | { | |
114 | struct dca_domain *domain; | |
115 | ||
116 | list_for_each_entry(domain, &dca_domains, node) | |
117 | if (domain->pci_rc == rc) | |
118 | return domain; | |
119 | ||
120 | return NULL; | |
121 | } | |
122 | ||
123 | static struct dca_domain *dca_get_domain(struct device *dev) | |
124 | { | |
125 | struct pci_bus *rc; | |
126 | struct dca_domain *domain; | |
127 | ||
128 | rc = dca_pci_rc_from_dev(dev); | |
129 | domain = dca_find_domain(rc); | |
130 | ||
131 | if (!domain) { | |
a1741e7f | 132 | if (dca_provider_ioat_ver_3_0(dev) && !list_empty(&dca_domains)) |
4e8cec26 | 133 | dca_providers_blocked = 1; |
1a5aeeec MS |
134 | } |
135 | ||
136 | return domain; | |
137 | } | |
138 | ||
139 | static struct dca_provider *dca_find_provider_by_dev(struct device *dev) | |
140 | { | |
141 | struct dca_provider *dca; | |
142 | struct pci_bus *rc; | |
143 | struct dca_domain *domain; | |
144 | ||
145 | if (dev) { | |
146 | rc = dca_pci_rc_from_dev(dev); | |
147 | domain = dca_find_domain(rc); | |
148 | if (!domain) | |
149 | return NULL; | |
150 | } else { | |
151 | if (!list_empty(&dca_domains)) | |
152 | domain = list_first_entry(&dca_domains, | |
153 | struct dca_domain, | |
154 | node); | |
155 | else | |
156 | return NULL; | |
7f1b358a MS |
157 | } |
158 | ||
1a5aeeec MS |
159 | list_for_each_entry(dca, &domain->dca_providers, node) |
160 | if ((!dev) || (dca->ops->dev_managed(dca, dev))) | |
161 | return dca; | |
162 | ||
163 | return NULL; | |
7f1b358a | 164 | } |
7589670f SN |
165 | |
166 | /** | |
167 | * dca_add_requester - add a dca client to the list | |
168 | * @dev - the device that wants dca service | |
169 | */ | |
170 | int dca_add_requester(struct device *dev) | |
171 | { | |
7f1b358a MS |
172 | struct dca_provider *dca; |
173 | int err, slot = -ENODEV; | |
eb4400e3 | 174 | unsigned long flags; |
1a5aeeec MS |
175 | struct pci_bus *pci_rc; |
176 | struct dca_domain *domain; | |
7589670f | 177 | |
7f1b358a MS |
178 | if (!dev) |
179 | return -EFAULT; | |
7589670f | 180 | |
a1741e7f | 181 | raw_spin_lock_irqsave(&dca_lock, flags); |
7f1b358a MS |
182 | |
183 | /* check if the requester has not been added already */ | |
184 | dca = dca_find_provider_by_dev(dev); | |
185 | if (dca) { | |
a1741e7f | 186 | raw_spin_unlock_irqrestore(&dca_lock, flags); |
7f1b358a MS |
187 | return -EEXIST; |
188 | } | |
189 | ||
1a5aeeec MS |
190 | pci_rc = dca_pci_rc_from_dev(dev); |
191 | domain = dca_find_domain(pci_rc); | |
192 | if (!domain) { | |
a1741e7f | 193 | raw_spin_unlock_irqrestore(&dca_lock, flags); |
1a5aeeec MS |
194 | return -ENODEV; |
195 | } | |
196 | ||
197 | list_for_each_entry(dca, &domain->dca_providers, node) { | |
7f1b358a MS |
198 | slot = dca->ops->add_requester(dca, dev); |
199 | if (slot >= 0) | |
200 | break; | |
201 | } | |
eb4400e3 | 202 | |
a1741e7f | 203 | raw_spin_unlock_irqrestore(&dca_lock, flags); |
eb4400e3 MS |
204 | |
205 | if (slot < 0) | |
7589670f SN |
206 | return slot; |
207 | ||
7f1b358a | 208 | err = dca_sysfs_add_req(dca, dev, slot); |
7589670f | 209 | if (err) { |
a1741e7f | 210 | raw_spin_lock_irqsave(&dca_lock, flags); |
eb4400e3 MS |
211 | if (dca == dca_find_provider_by_dev(dev)) |
212 | dca->ops->remove_requester(dca, dev); | |
a1741e7f | 213 | raw_spin_unlock_irqrestore(&dca_lock, flags); |
7589670f SN |
214 | return err; |
215 | } | |
216 | ||
217 | return 0; | |
218 | } | |
219 | EXPORT_SYMBOL_GPL(dca_add_requester); | |
220 | ||
221 | /** | |
222 | * dca_remove_requester - remove a dca client from the list | |
223 | * @dev - the device that wants dca service | |
224 | */ | |
225 | int dca_remove_requester(struct device *dev) | |
226 | { | |
7f1b358a | 227 | struct dca_provider *dca; |
7589670f | 228 | int slot; |
eb4400e3 | 229 | unsigned long flags; |
7f1b358a MS |
230 | |
231 | if (!dev) | |
232 | return -EFAULT; | |
7589670f | 233 | |
a1741e7f | 234 | raw_spin_lock_irqsave(&dca_lock, flags); |
7f1b358a MS |
235 | dca = dca_find_provider_by_dev(dev); |
236 | if (!dca) { | |
a1741e7f | 237 | raw_spin_unlock_irqrestore(&dca_lock, flags); |
7f1b358a MS |
238 | return -ENODEV; |
239 | } | |
240 | slot = dca->ops->remove_requester(dca, dev); | |
a1741e7f | 241 | raw_spin_unlock_irqrestore(&dca_lock, flags); |
eb4400e3 MS |
242 | |
243 | if (slot < 0) | |
7589670f SN |
244 | return slot; |
245 | ||
7f1b358a MS |
246 | dca_sysfs_remove_req(dca, slot); |
247 | ||
7589670f SN |
248 | return 0; |
249 | } | |
250 | EXPORT_SYMBOL_GPL(dca_remove_requester); | |
251 | ||
252 | /** | |
7f1b358a MS |
253 | * dca_common_get_tag - return the dca tag (serves both new and old api) |
254 | * @dev - the device that wants dca service | |
7589670f SN |
255 | * @cpu - the cpuid as returned by get_cpu() |
256 | */ | |
064223c1 | 257 | static u8 dca_common_get_tag(struct device *dev, int cpu) |
7589670f | 258 | { |
7f1b358a MS |
259 | struct dca_provider *dca; |
260 | u8 tag; | |
eb4400e3 | 261 | unsigned long flags; |
7f1b358a | 262 | |
a1741e7f | 263 | raw_spin_lock_irqsave(&dca_lock, flags); |
7f1b358a MS |
264 | |
265 | dca = dca_find_provider_by_dev(dev); | |
266 | if (!dca) { | |
a1741e7f | 267 | raw_spin_unlock_irqrestore(&dca_lock, flags); |
7589670f | 268 | return -ENODEV; |
7f1b358a MS |
269 | } |
270 | tag = dca->ops->get_tag(dca, dev, cpu); | |
271 | ||
a1741e7f | 272 | raw_spin_unlock_irqrestore(&dca_lock, flags); |
7f1b358a MS |
273 | return tag; |
274 | } | |
275 | ||
276 | /** | |
277 | * dca3_get_tag - return the dca tag to the requester device | |
278 | * for the given cpu (new api) | |
279 | * @dev - the device that wants dca service | |
280 | * @cpu - the cpuid as returned by get_cpu() | |
281 | */ | |
282 | u8 dca3_get_tag(struct device *dev, int cpu) | |
283 | { | |
284 | if (!dev) | |
285 | return -EFAULT; | |
286 | ||
287 | return dca_common_get_tag(dev, cpu); | |
288 | } | |
289 | EXPORT_SYMBOL_GPL(dca3_get_tag); | |
290 | ||
291 | /** | |
292 | * dca_get_tag - return the dca tag for the given cpu (old api) | |
293 | * @cpu - the cpuid as returned by get_cpu() | |
294 | */ | |
295 | u8 dca_get_tag(int cpu) | |
296 | { | |
297 | struct device *dev = NULL; | |
298 | ||
299 | return dca_common_get_tag(dev, cpu); | |
7589670f SN |
300 | } |
301 | EXPORT_SYMBOL_GPL(dca_get_tag); | |
302 | ||
303 | /** | |
304 | * alloc_dca_provider - get data struct for describing a dca provider | |
305 | * @ops - pointer to struct of dca operation function pointers | |
306 | * @priv_size - size of extra mem to be added for provider's needs | |
307 | */ | |
2bb129eb JL |
308 | struct dca_provider *alloc_dca_provider(const struct dca_ops *ops, |
309 | int priv_size) | |
7589670f SN |
310 | { |
311 | struct dca_provider *dca; | |
312 | int alloc_size; | |
313 | ||
314 | alloc_size = (sizeof(*dca) + priv_size); | |
315 | dca = kzalloc(alloc_size, GFP_KERNEL); | |
316 | if (!dca) | |
317 | return NULL; | |
318 | dca->ops = ops; | |
319 | ||
320 | return dca; | |
321 | } | |
322 | EXPORT_SYMBOL_GPL(alloc_dca_provider); | |
323 | ||
324 | /** | |
325 | * free_dca_provider - release the dca provider data struct | |
326 | * @ops - pointer to struct of dca operation function pointers | |
327 | * @priv_size - size of extra mem to be added for provider's needs | |
328 | */ | |
329 | void free_dca_provider(struct dca_provider *dca) | |
330 | { | |
331 | kfree(dca); | |
332 | } | |
333 | EXPORT_SYMBOL_GPL(free_dca_provider); | |
334 | ||
7589670f SN |
335 | /** |
336 | * register_dca_provider - register a dca provider | |
337 | * @dca - struct created by alloc_dca_provider() | |
338 | * @dev - device providing dca services | |
339 | */ | |
340 | int register_dca_provider(struct dca_provider *dca, struct device *dev) | |
341 | { | |
342 | int err; | |
eb4400e3 | 343 | unsigned long flags; |
a1741e7f | 344 | struct dca_domain *domain, *newdomain = NULL; |
7589670f | 345 | |
a1741e7f | 346 | raw_spin_lock_irqsave(&dca_lock, flags); |
4e8cec26 | 347 | if (dca_providers_blocked) { |
a1741e7f | 348 | raw_spin_unlock_irqrestore(&dca_lock, flags); |
4e8cec26 SM |
349 | return -ENODEV; |
350 | } | |
a1741e7f | 351 | raw_spin_unlock_irqrestore(&dca_lock, flags); |
4e8cec26 | 352 | |
7589670f SN |
353 | err = dca_sysfs_add_provider(dca, dev); |
354 | if (err) | |
355 | return err; | |
eb4400e3 | 356 | |
a1741e7f | 357 | raw_spin_lock_irqsave(&dca_lock, flags); |
1a5aeeec MS |
358 | domain = dca_get_domain(dev); |
359 | if (!domain) { | |
a1741e7f MG |
360 | struct pci_bus *rc; |
361 | ||
4e8cec26 | 362 | if (dca_providers_blocked) { |
a1741e7f | 363 | raw_spin_unlock_irqrestore(&dca_lock, flags); |
4e8cec26 SM |
364 | dca_sysfs_remove_provider(dca); |
365 | unregister_dca_providers(); | |
a1741e7f MG |
366 | return -ENODEV; |
367 | } | |
368 | ||
369 | raw_spin_unlock_irqrestore(&dca_lock, flags); | |
370 | rc = dca_pci_rc_from_dev(dev); | |
371 | newdomain = dca_allocate_domain(rc); | |
372 | if (!newdomain) | |
373 | return -ENODEV; | |
374 | raw_spin_lock_irqsave(&dca_lock, flags); | |
375 | /* Recheck, we might have raced after dropping the lock */ | |
376 | domain = dca_get_domain(dev); | |
377 | if (!domain) { | |
378 | domain = newdomain; | |
379 | newdomain = NULL; | |
380 | list_add(&domain->node, &dca_domains); | |
4e8cec26 | 381 | } |
1a5aeeec MS |
382 | } |
383 | list_add(&dca->node, &domain->dca_providers); | |
a1741e7f | 384 | raw_spin_unlock_irqrestore(&dca_lock, flags); |
eb4400e3 | 385 | |
7589670f SN |
386 | blocking_notifier_call_chain(&dca_provider_chain, |
387 | DCA_PROVIDER_ADD, NULL); | |
a1741e7f | 388 | kfree(newdomain); |
7589670f SN |
389 | return 0; |
390 | } | |
391 | EXPORT_SYMBOL_GPL(register_dca_provider); | |
392 | ||
393 | /** | |
394 | * unregister_dca_provider - remove a dca provider | |
395 | * @dca - struct created by alloc_dca_provider() | |
396 | */ | |
1a5aeeec | 397 | void unregister_dca_provider(struct dca_provider *dca, struct device *dev) |
7589670f | 398 | { |
eb4400e3 | 399 | unsigned long flags; |
1a5aeeec MS |
400 | struct pci_bus *pci_rc; |
401 | struct dca_domain *domain; | |
eb4400e3 | 402 | |
7589670f SN |
403 | blocking_notifier_call_chain(&dca_provider_chain, |
404 | DCA_PROVIDER_REMOVE, NULL); | |
eb4400e3 | 405 | |
a1741e7f | 406 | raw_spin_lock_irqsave(&dca_lock, flags); |
1a5aeeec | 407 | |
c419fcfd MS |
408 | if (list_empty(&dca_domains)) { |
409 | raw_spin_unlock_irqrestore(&dca_lock, flags); | |
410 | return; | |
411 | } | |
412 | ||
7f1b358a | 413 | list_del(&dca->node); |
1a5aeeec MS |
414 | |
415 | pci_rc = dca_pci_rc_from_dev(dev); | |
416 | domain = dca_find_domain(pci_rc); | |
417 | if (list_empty(&domain->dca_providers)) | |
418 | dca_free_domain(domain); | |
419 | ||
a1741e7f | 420 | raw_spin_unlock_irqrestore(&dca_lock, flags); |
eb4400e3 | 421 | |
7589670f SN |
422 | dca_sysfs_remove_provider(dca); |
423 | } | |
424 | EXPORT_SYMBOL_GPL(unregister_dca_provider); | |
425 | ||
426 | /** | |
427 | * dca_register_notify - register a client's notifier callback | |
428 | */ | |
429 | void dca_register_notify(struct notifier_block *nb) | |
430 | { | |
431 | blocking_notifier_chain_register(&dca_provider_chain, nb); | |
432 | } | |
433 | EXPORT_SYMBOL_GPL(dca_register_notify); | |
434 | ||
435 | /** | |
436 | * dca_unregister_notify - remove a client's notifier callback | |
437 | */ | |
438 | void dca_unregister_notify(struct notifier_block *nb) | |
439 | { | |
440 | blocking_notifier_chain_unregister(&dca_provider_chain, nb); | |
441 | } | |
442 | EXPORT_SYMBOL_GPL(dca_unregister_notify); | |
443 | ||
444 | static int __init dca_init(void) | |
445 | { | |
084dac53 | 446 | pr_info("dca service started, version %s\n", DCA_VERSION); |
7589670f SN |
447 | return dca_sysfs_init(); |
448 | } | |
449 | ||
450 | static void __exit dca_exit(void) | |
451 | { | |
452 | dca_sysfs_exit(); | |
453 | } | |
454 | ||
652afc27 | 455 | arch_initcall(dca_init); |
7589670f SN |
456 | module_exit(dca_exit); |
457 |