Commit | Line | Data |
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7589670f | 1 | /* |
211a22ce | 2 | * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved. |
7589670f SN |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License as published by the Free | |
6 | * Software Foundation; either version 2 of the License, or (at your option) | |
7 | * any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., 59 | |
16 | * Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | * | |
18 | * The full GNU General Public License is included in this distribution in the | |
19 | * file called COPYING. | |
20 | */ | |
21 | ||
22 | /* | |
23 | * This driver supports an interface for DCA clients and providers to meet. | |
24 | */ | |
25 | ||
26 | #include <linux/kernel.h> | |
27 | #include <linux/notifier.h> | |
28 | #include <linux/device.h> | |
29 | #include <linux/dca.h> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
7589670f | 31 | |
1a5aeeec | 32 | #define DCA_VERSION "1.12.1" |
7589670f | 33 | |
7f1b358a MS |
34 | MODULE_VERSION(DCA_VERSION); |
35 | MODULE_LICENSE("GPL"); | |
36 | MODULE_AUTHOR("Intel Corporation"); | |
7589670f SN |
37 | |
38 | static DEFINE_SPINLOCK(dca_lock); | |
39 | ||
1a5aeeec | 40 | static LIST_HEAD(dca_domains); |
7f1b358a | 41 | |
4e8cec26 SM |
42 | static BLOCKING_NOTIFIER_HEAD(dca_provider_chain); |
43 | ||
44 | static int dca_providers_blocked; | |
45 | ||
1a5aeeec | 46 | static struct pci_bus *dca_pci_rc_from_dev(struct device *dev) |
7f1b358a | 47 | { |
1a5aeeec MS |
48 | struct pci_dev *pdev = to_pci_dev(dev); |
49 | struct pci_bus *bus = pdev->bus; | |
7f1b358a | 50 | |
1a5aeeec MS |
51 | while (bus->parent) |
52 | bus = bus->parent; | |
53 | ||
54 | return bus; | |
55 | } | |
56 | ||
57 | static struct dca_domain *dca_allocate_domain(struct pci_bus *rc) | |
58 | { | |
59 | struct dca_domain *domain; | |
60 | ||
61 | domain = kzalloc(sizeof(*domain), GFP_NOWAIT); | |
62 | if (!domain) | |
63 | return NULL; | |
64 | ||
65 | INIT_LIST_HEAD(&domain->dca_providers); | |
66 | domain->pci_rc = rc; | |
67 | ||
68 | return domain; | |
69 | } | |
70 | ||
71 | static void dca_free_domain(struct dca_domain *domain) | |
72 | { | |
73 | list_del(&domain->node); | |
74 | kfree(domain); | |
75 | } | |
76 | ||
4e8cec26 SM |
77 | static int dca_provider_ioat_ver_3_0(struct device *dev) |
78 | { | |
79 | struct pci_dev *pdev = to_pci_dev(dev); | |
80 | ||
81 | return ((pdev->vendor == PCI_VENDOR_ID_INTEL) && | |
82 | ((pdev->device == PCI_DEVICE_ID_INTEL_IOAT_TBG0) || | |
83 | (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_TBG1) || | |
84 | (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_TBG2) || | |
85 | (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_TBG3) || | |
86 | (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_TBG4) || | |
87 | (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_TBG5) || | |
88 | (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_TBG6) || | |
89 | (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_TBG7))); | |
90 | } | |
91 | ||
92 | static void unregister_dca_providers(void) | |
93 | { | |
94 | struct dca_provider *dca, *_dca; | |
95 | struct list_head unregistered_providers; | |
96 | struct dca_domain *domain; | |
97 | unsigned long flags; | |
98 | ||
99 | blocking_notifier_call_chain(&dca_provider_chain, | |
100 | DCA_PROVIDER_REMOVE, NULL); | |
101 | ||
102 | INIT_LIST_HEAD(&unregistered_providers); | |
103 | ||
104 | spin_lock_irqsave(&dca_lock, flags); | |
105 | ||
106 | if (list_empty(&dca_domains)) { | |
107 | spin_unlock_irqrestore(&dca_lock, flags); | |
108 | return; | |
109 | } | |
110 | ||
111 | /* at this point only one domain in the list is expected */ | |
112 | domain = list_first_entry(&dca_domains, struct dca_domain, node); | |
113 | if (!domain) | |
114 | return; | |
115 | ||
116 | list_for_each_entry_safe(dca, _dca, &domain->dca_providers, node) { | |
117 | list_del(&dca->node); | |
118 | list_add(&dca->node, &unregistered_providers); | |
119 | } | |
120 | ||
121 | dca_free_domain(domain); | |
122 | ||
123 | spin_unlock_irqrestore(&dca_lock, flags); | |
124 | ||
125 | list_for_each_entry_safe(dca, _dca, &unregistered_providers, node) { | |
126 | dca_sysfs_remove_provider(dca); | |
127 | list_del(&dca->node); | |
128 | } | |
129 | } | |
130 | ||
1a5aeeec MS |
131 | static struct dca_domain *dca_find_domain(struct pci_bus *rc) |
132 | { | |
133 | struct dca_domain *domain; | |
134 | ||
135 | list_for_each_entry(domain, &dca_domains, node) | |
136 | if (domain->pci_rc == rc) | |
137 | return domain; | |
138 | ||
139 | return NULL; | |
140 | } | |
141 | ||
142 | static struct dca_domain *dca_get_domain(struct device *dev) | |
143 | { | |
144 | struct pci_bus *rc; | |
145 | struct dca_domain *domain; | |
146 | ||
147 | rc = dca_pci_rc_from_dev(dev); | |
148 | domain = dca_find_domain(rc); | |
149 | ||
150 | if (!domain) { | |
4e8cec26 SM |
151 | if (dca_provider_ioat_ver_3_0(dev) && !list_empty(&dca_domains)) { |
152 | dca_providers_blocked = 1; | |
153 | } else { | |
154 | domain = dca_allocate_domain(rc); | |
155 | if (domain) | |
156 | list_add(&domain->node, &dca_domains); | |
157 | } | |
1a5aeeec MS |
158 | } |
159 | ||
160 | return domain; | |
161 | } | |
162 | ||
163 | static struct dca_provider *dca_find_provider_by_dev(struct device *dev) | |
164 | { | |
165 | struct dca_provider *dca; | |
166 | struct pci_bus *rc; | |
167 | struct dca_domain *domain; | |
168 | ||
169 | if (dev) { | |
170 | rc = dca_pci_rc_from_dev(dev); | |
171 | domain = dca_find_domain(rc); | |
172 | if (!domain) | |
173 | return NULL; | |
174 | } else { | |
175 | if (!list_empty(&dca_domains)) | |
176 | domain = list_first_entry(&dca_domains, | |
177 | struct dca_domain, | |
178 | node); | |
179 | else | |
180 | return NULL; | |
7f1b358a MS |
181 | } |
182 | ||
1a5aeeec MS |
183 | list_for_each_entry(dca, &domain->dca_providers, node) |
184 | if ((!dev) || (dca->ops->dev_managed(dca, dev))) | |
185 | return dca; | |
186 | ||
187 | return NULL; | |
7f1b358a | 188 | } |
7589670f SN |
189 | |
190 | /** | |
191 | * dca_add_requester - add a dca client to the list | |
192 | * @dev - the device that wants dca service | |
193 | */ | |
194 | int dca_add_requester(struct device *dev) | |
195 | { | |
7f1b358a MS |
196 | struct dca_provider *dca; |
197 | int err, slot = -ENODEV; | |
eb4400e3 | 198 | unsigned long flags; |
1a5aeeec MS |
199 | struct pci_bus *pci_rc; |
200 | struct dca_domain *domain; | |
7589670f | 201 | |
7f1b358a MS |
202 | if (!dev) |
203 | return -EFAULT; | |
7589670f | 204 | |
eb4400e3 | 205 | spin_lock_irqsave(&dca_lock, flags); |
7f1b358a MS |
206 | |
207 | /* check if the requester has not been added already */ | |
208 | dca = dca_find_provider_by_dev(dev); | |
209 | if (dca) { | |
eb4400e3 | 210 | spin_unlock_irqrestore(&dca_lock, flags); |
7f1b358a MS |
211 | return -EEXIST; |
212 | } | |
213 | ||
1a5aeeec MS |
214 | pci_rc = dca_pci_rc_from_dev(dev); |
215 | domain = dca_find_domain(pci_rc); | |
216 | if (!domain) { | |
217 | spin_unlock_irqrestore(&dca_lock, flags); | |
218 | return -ENODEV; | |
219 | } | |
220 | ||
221 | list_for_each_entry(dca, &domain->dca_providers, node) { | |
7f1b358a MS |
222 | slot = dca->ops->add_requester(dca, dev); |
223 | if (slot >= 0) | |
224 | break; | |
225 | } | |
eb4400e3 MS |
226 | |
227 | spin_unlock_irqrestore(&dca_lock, flags); | |
228 | ||
229 | if (slot < 0) | |
7589670f SN |
230 | return slot; |
231 | ||
7f1b358a | 232 | err = dca_sysfs_add_req(dca, dev, slot); |
7589670f | 233 | if (err) { |
eb4400e3 MS |
234 | spin_lock_irqsave(&dca_lock, flags); |
235 | if (dca == dca_find_provider_by_dev(dev)) | |
236 | dca->ops->remove_requester(dca, dev); | |
237 | spin_unlock_irqrestore(&dca_lock, flags); | |
7589670f SN |
238 | return err; |
239 | } | |
240 | ||
241 | return 0; | |
242 | } | |
243 | EXPORT_SYMBOL_GPL(dca_add_requester); | |
244 | ||
245 | /** | |
246 | * dca_remove_requester - remove a dca client from the list | |
247 | * @dev - the device that wants dca service | |
248 | */ | |
249 | int dca_remove_requester(struct device *dev) | |
250 | { | |
7f1b358a | 251 | struct dca_provider *dca; |
7589670f | 252 | int slot; |
eb4400e3 | 253 | unsigned long flags; |
7f1b358a MS |
254 | |
255 | if (!dev) | |
256 | return -EFAULT; | |
7589670f | 257 | |
eb4400e3 | 258 | spin_lock_irqsave(&dca_lock, flags); |
7f1b358a MS |
259 | dca = dca_find_provider_by_dev(dev); |
260 | if (!dca) { | |
eb4400e3 | 261 | spin_unlock_irqrestore(&dca_lock, flags); |
7f1b358a MS |
262 | return -ENODEV; |
263 | } | |
264 | slot = dca->ops->remove_requester(dca, dev); | |
eb4400e3 MS |
265 | spin_unlock_irqrestore(&dca_lock, flags); |
266 | ||
267 | if (slot < 0) | |
7589670f SN |
268 | return slot; |
269 | ||
7f1b358a MS |
270 | dca_sysfs_remove_req(dca, slot); |
271 | ||
7589670f SN |
272 | return 0; |
273 | } | |
274 | EXPORT_SYMBOL_GPL(dca_remove_requester); | |
275 | ||
276 | /** | |
7f1b358a MS |
277 | * dca_common_get_tag - return the dca tag (serves both new and old api) |
278 | * @dev - the device that wants dca service | |
7589670f SN |
279 | * @cpu - the cpuid as returned by get_cpu() |
280 | */ | |
7f1b358a | 281 | u8 dca_common_get_tag(struct device *dev, int cpu) |
7589670f | 282 | { |
7f1b358a MS |
283 | struct dca_provider *dca; |
284 | u8 tag; | |
eb4400e3 | 285 | unsigned long flags; |
7f1b358a | 286 | |
eb4400e3 | 287 | spin_lock_irqsave(&dca_lock, flags); |
7f1b358a MS |
288 | |
289 | dca = dca_find_provider_by_dev(dev); | |
290 | if (!dca) { | |
eb4400e3 | 291 | spin_unlock_irqrestore(&dca_lock, flags); |
7589670f | 292 | return -ENODEV; |
7f1b358a MS |
293 | } |
294 | tag = dca->ops->get_tag(dca, dev, cpu); | |
295 | ||
eb4400e3 | 296 | spin_unlock_irqrestore(&dca_lock, flags); |
7f1b358a MS |
297 | return tag; |
298 | } | |
299 | ||
300 | /** | |
301 | * dca3_get_tag - return the dca tag to the requester device | |
302 | * for the given cpu (new api) | |
303 | * @dev - the device that wants dca service | |
304 | * @cpu - the cpuid as returned by get_cpu() | |
305 | */ | |
306 | u8 dca3_get_tag(struct device *dev, int cpu) | |
307 | { | |
308 | if (!dev) | |
309 | return -EFAULT; | |
310 | ||
311 | return dca_common_get_tag(dev, cpu); | |
312 | } | |
313 | EXPORT_SYMBOL_GPL(dca3_get_tag); | |
314 | ||
315 | /** | |
316 | * dca_get_tag - return the dca tag for the given cpu (old api) | |
317 | * @cpu - the cpuid as returned by get_cpu() | |
318 | */ | |
319 | u8 dca_get_tag(int cpu) | |
320 | { | |
321 | struct device *dev = NULL; | |
322 | ||
323 | return dca_common_get_tag(dev, cpu); | |
7589670f SN |
324 | } |
325 | EXPORT_SYMBOL_GPL(dca_get_tag); | |
326 | ||
327 | /** | |
328 | * alloc_dca_provider - get data struct for describing a dca provider | |
329 | * @ops - pointer to struct of dca operation function pointers | |
330 | * @priv_size - size of extra mem to be added for provider's needs | |
331 | */ | |
332 | struct dca_provider *alloc_dca_provider(struct dca_ops *ops, int priv_size) | |
333 | { | |
334 | struct dca_provider *dca; | |
335 | int alloc_size; | |
336 | ||
337 | alloc_size = (sizeof(*dca) + priv_size); | |
338 | dca = kzalloc(alloc_size, GFP_KERNEL); | |
339 | if (!dca) | |
340 | return NULL; | |
341 | dca->ops = ops; | |
342 | ||
343 | return dca; | |
344 | } | |
345 | EXPORT_SYMBOL_GPL(alloc_dca_provider); | |
346 | ||
347 | /** | |
348 | * free_dca_provider - release the dca provider data struct | |
349 | * @ops - pointer to struct of dca operation function pointers | |
350 | * @priv_size - size of extra mem to be added for provider's needs | |
351 | */ | |
352 | void free_dca_provider(struct dca_provider *dca) | |
353 | { | |
354 | kfree(dca); | |
355 | } | |
356 | EXPORT_SYMBOL_GPL(free_dca_provider); | |
357 | ||
7589670f SN |
358 | /** |
359 | * register_dca_provider - register a dca provider | |
360 | * @dca - struct created by alloc_dca_provider() | |
361 | * @dev - device providing dca services | |
362 | */ | |
363 | int register_dca_provider(struct dca_provider *dca, struct device *dev) | |
364 | { | |
365 | int err; | |
eb4400e3 | 366 | unsigned long flags; |
1a5aeeec | 367 | struct dca_domain *domain; |
7589670f | 368 | |
4e8cec26 SM |
369 | spin_lock_irqsave(&dca_lock, flags); |
370 | if (dca_providers_blocked) { | |
371 | spin_unlock_irqrestore(&dca_lock, flags); | |
372 | return -ENODEV; | |
373 | } | |
374 | spin_unlock_irqrestore(&dca_lock, flags); | |
375 | ||
7589670f SN |
376 | err = dca_sysfs_add_provider(dca, dev); |
377 | if (err) | |
378 | return err; | |
eb4400e3 MS |
379 | |
380 | spin_lock_irqsave(&dca_lock, flags); | |
1a5aeeec MS |
381 | domain = dca_get_domain(dev); |
382 | if (!domain) { | |
4e8cec26 SM |
383 | if (dca_providers_blocked) { |
384 | spin_unlock_irqrestore(&dca_lock, flags); | |
385 | dca_sysfs_remove_provider(dca); | |
386 | unregister_dca_providers(); | |
387 | } else { | |
388 | spin_unlock_irqrestore(&dca_lock, flags); | |
389 | } | |
1a5aeeec MS |
390 | return -ENODEV; |
391 | } | |
392 | list_add(&dca->node, &domain->dca_providers); | |
eb4400e3 MS |
393 | spin_unlock_irqrestore(&dca_lock, flags); |
394 | ||
7589670f SN |
395 | blocking_notifier_call_chain(&dca_provider_chain, |
396 | DCA_PROVIDER_ADD, NULL); | |
397 | return 0; | |
398 | } | |
399 | EXPORT_SYMBOL_GPL(register_dca_provider); | |
400 | ||
401 | /** | |
402 | * unregister_dca_provider - remove a dca provider | |
403 | * @dca - struct created by alloc_dca_provider() | |
404 | */ | |
1a5aeeec | 405 | void unregister_dca_provider(struct dca_provider *dca, struct device *dev) |
7589670f | 406 | { |
eb4400e3 | 407 | unsigned long flags; |
1a5aeeec MS |
408 | struct pci_bus *pci_rc; |
409 | struct dca_domain *domain; | |
eb4400e3 | 410 | |
7589670f SN |
411 | blocking_notifier_call_chain(&dca_provider_chain, |
412 | DCA_PROVIDER_REMOVE, NULL); | |
eb4400e3 MS |
413 | |
414 | spin_lock_irqsave(&dca_lock, flags); | |
1a5aeeec | 415 | |
7f1b358a | 416 | list_del(&dca->node); |
1a5aeeec MS |
417 | |
418 | pci_rc = dca_pci_rc_from_dev(dev); | |
419 | domain = dca_find_domain(pci_rc); | |
420 | if (list_empty(&domain->dca_providers)) | |
421 | dca_free_domain(domain); | |
422 | ||
eb4400e3 MS |
423 | spin_unlock_irqrestore(&dca_lock, flags); |
424 | ||
7589670f SN |
425 | dca_sysfs_remove_provider(dca); |
426 | } | |
427 | EXPORT_SYMBOL_GPL(unregister_dca_provider); | |
428 | ||
429 | /** | |
430 | * dca_register_notify - register a client's notifier callback | |
431 | */ | |
432 | void dca_register_notify(struct notifier_block *nb) | |
433 | { | |
434 | blocking_notifier_chain_register(&dca_provider_chain, nb); | |
435 | } | |
436 | EXPORT_SYMBOL_GPL(dca_register_notify); | |
437 | ||
438 | /** | |
439 | * dca_unregister_notify - remove a client's notifier callback | |
440 | */ | |
441 | void dca_unregister_notify(struct notifier_block *nb) | |
442 | { | |
443 | blocking_notifier_chain_unregister(&dca_provider_chain, nb); | |
444 | } | |
445 | EXPORT_SYMBOL_GPL(dca_unregister_notify); | |
446 | ||
447 | static int __init dca_init(void) | |
448 | { | |
084dac53 | 449 | pr_info("dca service started, version %s\n", DCA_VERSION); |
7589670f SN |
450 | return dca_sysfs_init(); |
451 | } | |
452 | ||
453 | static void __exit dca_exit(void) | |
454 | { | |
455 | dca_sysfs_exit(); | |
456 | } | |
457 | ||
652afc27 | 458 | arch_initcall(dca_init); |
7589670f SN |
459 | module_exit(dca_exit); |
460 |