Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/misc/mei/pci-me.c

  1 /*
  2  *
  3  * Intel Management Engine Interface (Intel MEI) Linux driver
  4  * Copyright (c) 2003-2012, Intel Corporation.
  5  *
  6  * This program is free software; you can redistribute it and/or modify it
  7  * under the terms and conditions of the GNU General Public License,
  8  * version 2, as published by the Free Software Foundation.
  9  *
 10  * This program is distributed in the hope it will be useful, but WITHOUT
 11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 13  * more details.
 14  *
 15  */
 16 #include <linux/module.h>
 17 #include <linux/moduleparam.h>
 18 #include <linux/kernel.h>
 19 #include <linux/device.h>
 20 #include <linux/fs.h>
 21 #include <linux/errno.h>
 22 #include <linux/types.h>
 23 #include <linux/fcntl.h>
 24 #include <linux/aio.h>
 25 #include <linux/pci.h>
 26 #include <linux/poll.h>
 27 #include <linux/ioctl.h>
 28 #include <linux/cdev.h>
 29 #include <linux/sched.h>
 30 #include <linux/uuid.h>
 31 #include <linux/compat.h>
 32 #include <linux/jiffies.h>
 33 #include <linux/interrupt.h>
 34 
 35 #include <linux/pm_runtime.h>
 36 
 37 #include <linux/mei.h>
 38 
 39 #include "mei_dev.h"
 40 #include "client.h"
 41 #include "hw-me-regs.h"
 42 #include "hw-me.h"
 43 
 44 /* mei_pci_tbl - PCI Device ID Table */
 45 static const struct pci_device_id mei_me_pci_tbl[] = {
 46         {MEI_PCI_DEVICE(MEI_DEV_ID_82946GZ, mei_me_legacy_cfg)},
 47         {MEI_PCI_DEVICE(MEI_DEV_ID_82G35, mei_me_legacy_cfg)},
 48         {MEI_PCI_DEVICE(MEI_DEV_ID_82Q965, mei_me_legacy_cfg)},
 49         {MEI_PCI_DEVICE(MEI_DEV_ID_82G965, mei_me_legacy_cfg)},
 50         {MEI_PCI_DEVICE(MEI_DEV_ID_82GM965, mei_me_legacy_cfg)},
 51         {MEI_PCI_DEVICE(MEI_DEV_ID_82GME965, mei_me_legacy_cfg)},
 52         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82Q35, mei_me_legacy_cfg)},
 53         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82G33, mei_me_legacy_cfg)},
 54         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82Q33, mei_me_legacy_cfg)},
 55         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82X38, mei_me_legacy_cfg)},
 56         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_3200, mei_me_legacy_cfg)},
 57 
 58         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_6, mei_me_legacy_cfg)},
 59         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_7, mei_me_legacy_cfg)},
 60         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_8, mei_me_legacy_cfg)},
 61         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_9, mei_me_legacy_cfg)},
 62         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_10, mei_me_legacy_cfg)},
 63         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_1, mei_me_legacy_cfg)},
 64         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_2, mei_me_legacy_cfg)},
 65         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_3, mei_me_legacy_cfg)},
 66         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_4, mei_me_legacy_cfg)},
 67         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_1, mei_me_ich_cfg)},
 68         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_2, mei_me_ich_cfg)},
 69         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_3, mei_me_ich_cfg)},
 70         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_4, mei_me_ich_cfg)},
 71 
 72         {MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_1, mei_me_pch_cfg)},
 73         {MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_2, mei_me_pch_cfg)},
 74         {MEI_PCI_DEVICE(MEI_DEV_ID_CPT_1, mei_me_pch_cpt_pbg_cfg)},
 75         {MEI_PCI_DEVICE(MEI_DEV_ID_PBG_1, mei_me_pch_cpt_pbg_cfg)},
 76         {MEI_PCI_DEVICE(MEI_DEV_ID_PPT_1, mei_me_pch_cfg)},
 77         {MEI_PCI_DEVICE(MEI_DEV_ID_PPT_2, mei_me_pch_cfg)},
 78         {MEI_PCI_DEVICE(MEI_DEV_ID_PPT_3, mei_me_pch_cfg)},
 79         {MEI_PCI_DEVICE(MEI_DEV_ID_LPT_H, mei_me_lpt_cfg)},
 80         {MEI_PCI_DEVICE(MEI_DEV_ID_LPT_W, mei_me_lpt_cfg)},
 81         {MEI_PCI_DEVICE(MEI_DEV_ID_LPT_LP, mei_me_pch_cfg)},
 82         {MEI_PCI_DEVICE(MEI_DEV_ID_LPT_HR, mei_me_lpt_cfg)},
 83         {MEI_PCI_DEVICE(MEI_DEV_ID_WPT_LP, mei_me_pch_cfg)},
 84         {MEI_PCI_DEVICE(MEI_DEV_ID_WPT_LP_2, mei_me_pch_cfg)},
 85 
 86         /* required last entry */
 87         {0, }
 88 };
 89 
 90 MODULE_DEVICE_TABLE(pci, mei_me_pci_tbl);
 91 
 92 #ifdef CONFIG_PM_RUNTIME
 93 static inline void mei_me_set_pm_domain(struct mei_device *dev);
 94 static inline void mei_me_unset_pm_domain(struct mei_device *dev);
 95 #else
 96 static inline void mei_me_set_pm_domain(struct mei_device *dev) {}
 97 static inline void mei_me_unset_pm_domain(struct mei_device *dev) {}
 98 #endif /* CONFIG_PM_RUNTIME */
 99 
100 /**
101  * mei_quirk_probe - probe for devices that doesn't valid ME interface
102  *
103  * @pdev: PCI device structure
104  * @cfg: per generation config
105  *
106  * returns true if ME Interface is valid, false otherwise
107  */
108 static bool mei_me_quirk_probe(struct pci_dev *pdev,
109                                 const struct mei_cfg *cfg)
110 {
111         if (cfg->quirk_probe && cfg->quirk_probe(pdev)) {
112                 dev_info(&pdev->dev, "Device doesn't have valid ME Interface\n");
113                 return false;
114         }
115 
116         return true;
117 }
118 
119 /**
120  * mei_probe - Device Initialization Routine
121  *
122  * @pdev: PCI device structure
123  * @ent: entry in kcs_pci_tbl
124  *
125  * returns 0 on success, <0 on failure.
126  */
127 static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
128 {
129         const struct mei_cfg *cfg = (struct mei_cfg *)(ent->driver_data);
130         struct mei_device *dev;
131         struct mei_me_hw *hw;
132         int err;
133 
134 
135         if (!mei_me_quirk_probe(pdev, cfg))
136                 return -ENODEV;
137 
138         /* enable pci dev */
139         err = pci_enable_device(pdev);
140         if (err) {
141                 dev_err(&pdev->dev, "failed to enable pci device.\n");
142                 goto end;
143         }
144         /* set PCI host mastering  */
145         pci_set_master(pdev);
146         /* pci request regions for mei driver */
147         err = pci_request_regions(pdev, KBUILD_MODNAME);
148         if (err) {
149                 dev_err(&pdev->dev, "failed to get pci regions.\n");
150                 goto disable_device;
151         }
152 
153         if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)) ||
154             dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64))) {
155 
156                 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
157                 if (err)
158                         err = dma_set_coherent_mask(&pdev->dev,
159                                                     DMA_BIT_MASK(32));
160         }
161         if (err) {
162                 dev_err(&pdev->dev, "No usable DMA configuration, aborting\n");
163                 goto release_regions;
164         }
165 
166 
167         /* allocates and initializes the mei dev structure */
168         dev = mei_me_dev_init(pdev, cfg);
169         if (!dev) {
170                 err = -ENOMEM;
171                 goto release_regions;
172         }
173         hw = to_me_hw(dev);
174         /* mapping  IO device memory */
175         hw->mem_addr = pci_iomap(pdev, 0, 0);
176         if (!hw->mem_addr) {
177                 dev_err(&pdev->dev, "mapping I/O device memory failure.\n");
178                 err = -ENOMEM;
179                 goto free_device;
180         }
181         pci_enable_msi(pdev);
182 
183          /* request and enable interrupt */
184         if (pci_dev_msi_enabled(pdev))
185                 err = request_threaded_irq(pdev->irq,
186                         NULL,
187                         mei_me_irq_thread_handler,
188                         IRQF_ONESHOT, KBUILD_MODNAME, dev);
189         else
190                 err = request_threaded_irq(pdev->irq,
191                         mei_me_irq_quick_handler,
192                         mei_me_irq_thread_handler,
193                         IRQF_SHARED, KBUILD_MODNAME, dev);
194 
195         if (err) {
196                 dev_err(&pdev->dev, "request_threaded_irq failure. irq = %d\n",
197                        pdev->irq);
198                 goto disable_msi;
199         }
200 
201         if (mei_start(dev)) {
202                 dev_err(&pdev->dev, "init hw failure.\n");
203                 err = -ENODEV;
204                 goto release_irq;
205         }
206 
207         pm_runtime_set_autosuspend_delay(&pdev->dev, MEI_ME_RPM_TIMEOUT);
208         pm_runtime_use_autosuspend(&pdev->dev);
209 
210         err = mei_register(dev, &pdev->dev);
211         if (err)
212                 goto release_irq;
213 
214         pci_set_drvdata(pdev, dev);
215 
216         schedule_delayed_work(&dev->timer_work, HZ);
217 
218         /*
219         * For not wake-able HW runtime pm framework
220         * can't be used on pci device level.
221         * Use domain runtime pm callbacks instead.
222         */
223         if (!pci_dev_run_wake(pdev))
224                 mei_me_set_pm_domain(dev);
225 
226         if (mei_pg_is_enabled(dev))
227                 pm_runtime_put_noidle(&pdev->dev);
228 
229         dev_dbg(&pdev->dev, "initialization successful.\n");
230 
231         return 0;
232 
233 release_irq:
234         mei_cancel_work(dev);
235         mei_disable_interrupts(dev);
236         free_irq(pdev->irq, dev);
237 disable_msi:
238         pci_disable_msi(pdev);
239         pci_iounmap(pdev, hw->mem_addr);
240 free_device:
241         kfree(dev);
242 release_regions:
243         pci_release_regions(pdev);
244 disable_device:
245         pci_disable_device(pdev);
246 end:
247         dev_err(&pdev->dev, "initialization failed.\n");
248         return err;
249 }
250 
251 /**
252  * mei_remove - Device Removal Routine
253  *
254  * @pdev: PCI device structure
255  *
256  * mei_remove is called by the PCI subsystem to alert the driver
257  * that it should release a PCI device.
258  */
259 static void mei_me_remove(struct pci_dev *pdev)
260 {
261         struct mei_device *dev;
262         struct mei_me_hw *hw;
263 
264         dev = pci_get_drvdata(pdev);
265         if (!dev)
266                 return;
267 
268         if (mei_pg_is_enabled(dev))
269                 pm_runtime_get_noresume(&pdev->dev);
270 
271         hw = to_me_hw(dev);
272 
273 
274         dev_dbg(&pdev->dev, "stop\n");
275         mei_stop(dev);
276 
277         if (!pci_dev_run_wake(pdev))
278                 mei_me_unset_pm_domain(dev);
279 
280         /* disable interrupts */
281         mei_disable_interrupts(dev);
282 
283         free_irq(pdev->irq, dev);
284         pci_disable_msi(pdev);
285 
286         if (hw->mem_addr)
287                 pci_iounmap(pdev, hw->mem_addr);
288 
289         mei_deregister(dev);
290 
291         kfree(dev);
292 
293         pci_release_regions(pdev);
294         pci_disable_device(pdev);
295 
296 
297 }
298 #ifdef CONFIG_PM_SLEEP
299 static int mei_me_pci_suspend(struct device *device)
300 {
301         struct pci_dev *pdev = to_pci_dev(device);
302         struct mei_device *dev = pci_get_drvdata(pdev);
303 
304         if (!dev)
305                 return -ENODEV;
306 
307         dev_dbg(&pdev->dev, "suspend\n");
308 
309         mei_stop(dev);
310 
311         mei_disable_interrupts(dev);
312 
313         free_irq(pdev->irq, dev);
314         pci_disable_msi(pdev);
315 
316         return 0;
317 }
318 
319 static int mei_me_pci_resume(struct device *device)
320 {
321         struct pci_dev *pdev = to_pci_dev(device);
322         struct mei_device *dev;
323         int err;
324 
325         dev = pci_get_drvdata(pdev);
326         if (!dev)
327                 return -ENODEV;
328 
329         pci_enable_msi(pdev);
330 
331         /* request and enable interrupt */
332         if (pci_dev_msi_enabled(pdev))
333                 err = request_threaded_irq(pdev->irq,
334                         NULL,
335                         mei_me_irq_thread_handler,
336                         IRQF_ONESHOT, KBUILD_MODNAME, dev);
337         else
338                 err = request_threaded_irq(pdev->irq,
339                         mei_me_irq_quick_handler,
340                         mei_me_irq_thread_handler,
341                         IRQF_SHARED, KBUILD_MODNAME, dev);
342 
343         if (err) {
344                 dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
345                                 pdev->irq);
346                 return err;
347         }
348 
349         err = mei_restart(dev);
350         if (err)
351                 return err;
352 
353         /* Start timer if stopped in suspend */
354         schedule_delayed_work(&dev->timer_work, HZ);
355 
356         return 0;
357 }
358 #endif /* CONFIG_PM_SLEEP */
359 
360 #ifdef CONFIG_PM_RUNTIME
361 static int mei_me_pm_runtime_idle(struct device *device)
362 {
363         struct pci_dev *pdev = to_pci_dev(device);
364         struct mei_device *dev;
365 
366         dev_dbg(&pdev->dev, "rpm: me: runtime_idle\n");
367 
368         dev = pci_get_drvdata(pdev);
369         if (!dev)
370                 return -ENODEV;
371         if (mei_write_is_idle(dev))
372                 pm_runtime_autosuspend(device);
373 
374         return -EBUSY;
375 }
376 
377 static int mei_me_pm_runtime_suspend(struct device *device)
378 {
379         struct pci_dev *pdev = to_pci_dev(device);
380         struct mei_device *dev;
381         int ret;
382 
383         dev_dbg(&pdev->dev, "rpm: me: runtime suspend\n");
384 
385         dev = pci_get_drvdata(pdev);
386         if (!dev)
387                 return -ENODEV;
388 
389         mutex_lock(&dev->device_lock);
390 
391         if (mei_write_is_idle(dev))
392                 ret = mei_me_pg_set_sync(dev);
393         else
394                 ret = -EAGAIN;
395 
396         mutex_unlock(&dev->device_lock);
397 
398         dev_dbg(&pdev->dev, "rpm: me: runtime suspend ret=%d\n", ret);
399 
400         return ret;
401 }
402 
403 static int mei_me_pm_runtime_resume(struct device *device)
404 {
405         struct pci_dev *pdev = to_pci_dev(device);
406         struct mei_device *dev;
407         int ret;
408 
409         dev_dbg(&pdev->dev, "rpm: me: runtime resume\n");
410 
411         dev = pci_get_drvdata(pdev);
412         if (!dev)
413                 return -ENODEV;
414 
415         mutex_lock(&dev->device_lock);
416 
417         ret = mei_me_pg_unset_sync(dev);
418 
419         mutex_unlock(&dev->device_lock);
420 
421         dev_dbg(&pdev->dev, "rpm: me: runtime resume ret = %d\n", ret);
422 
423         return ret;
424 }
425 
426 /**
427  * mei_me_set_pm_domain - fill and set pm domian stucture for device
428  *
429  * @dev: mei_device
430  */
431 static inline void mei_me_set_pm_domain(struct mei_device *dev)
432 {
433         struct pci_dev *pdev  = dev->pdev;
434 
435         if (pdev->dev.bus && pdev->dev.bus->pm) {
436                 dev->pg_domain.ops = *pdev->dev.bus->pm;
437 
438                 dev->pg_domain.ops.runtime_suspend = mei_me_pm_runtime_suspend;
439                 dev->pg_domain.ops.runtime_resume = mei_me_pm_runtime_resume;
440                 dev->pg_domain.ops.runtime_idle = mei_me_pm_runtime_idle;
441 
442                 pdev->dev.pm_domain = &dev->pg_domain;
443         }
444 }
445 
446 /**
447  * mei_me_unset_pm_domain - clean pm domian stucture for device
448  *
449  * @dev: mei_device
450  */
451 static inline void mei_me_unset_pm_domain(struct mei_device *dev)
452 {
453         /* stop using pm callbacks if any */
454         dev->pdev->dev.pm_domain = NULL;
455 }
456 #endif /* CONFIG_PM_RUNTIME */
457 
458 #ifdef CONFIG_PM
459 static const struct dev_pm_ops mei_me_pm_ops = {
460         SET_SYSTEM_SLEEP_PM_OPS(mei_me_pci_suspend,
461                                 mei_me_pci_resume)
462         SET_RUNTIME_PM_OPS(
463                 mei_me_pm_runtime_suspend,
464                 mei_me_pm_runtime_resume,
465                 mei_me_pm_runtime_idle)
466 };
467 
468 #define MEI_ME_PM_OPS   (&mei_me_pm_ops)
469 #else
470 #define MEI_ME_PM_OPS   NULL
471 #endif /* CONFIG_PM */
472 /*
473  *  PCI driver structure
474  */
475 static struct pci_driver mei_me_driver = {
476         .name = KBUILD_MODNAME,
477         .id_table = mei_me_pci_tbl,
478         .probe = mei_me_probe,
479         .remove = mei_me_remove,
480         .shutdown = mei_me_remove,
481         .driver.pm = MEI_ME_PM_OPS,
482 };
483 
484 module_pci_driver(mei_me_driver);
485 
486 MODULE_AUTHOR("Intel Corporation");
487 MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
488 MODULE_LICENSE("GPL v2");
489 

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