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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/pci.h>
 25 #include <linux/poll.h>
 26 #include <linux/ioctl.h>
 27 #include <linux/cdev.h>
 28 #include <linux/sched.h>
 29 #include <linux/uuid.h>
 30 #include <linux/compat.h>
 31 #include <linux/jiffies.h>
 32 #include <linux/interrupt.h>
 33 
 34 #include <linux/pm_domain.h>
 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_pch8_sps_cfg)},
 80         {MEI_PCI_DEVICE(MEI_DEV_ID_LPT_W, mei_me_pch8_sps_cfg)},
 81         {MEI_PCI_DEVICE(MEI_DEV_ID_LPT_LP, mei_me_pch8_cfg)},
 82         {MEI_PCI_DEVICE(MEI_DEV_ID_LPT_HR, mei_me_pch8_sps_cfg)},
 83         {MEI_PCI_DEVICE(MEI_DEV_ID_WPT_LP, mei_me_pch8_cfg)},
 84         {MEI_PCI_DEVICE(MEI_DEV_ID_WPT_LP_2, mei_me_pch8_cfg)},
 85 
 86         {MEI_PCI_DEVICE(MEI_DEV_ID_SPT, mei_me_pch8_cfg)},
 87         {MEI_PCI_DEVICE(MEI_DEV_ID_SPT_2, mei_me_pch8_cfg)},
 88         {MEI_PCI_DEVICE(MEI_DEV_ID_SPT_H, mei_me_pch8_sps_cfg)},
 89         {MEI_PCI_DEVICE(MEI_DEV_ID_SPT_H_2, mei_me_pch8_sps_cfg)},
 90 
 91         {MEI_PCI_DEVICE(MEI_DEV_ID_BXT_M, mei_me_pch8_cfg)},
 92         {MEI_PCI_DEVICE(MEI_DEV_ID_APL_I, mei_me_pch8_cfg)},
 93 
 94         {MEI_PCI_DEVICE(MEI_DEV_ID_KBP, mei_me_pch8_cfg)},
 95         {MEI_PCI_DEVICE(MEI_DEV_ID_KBP_2, mei_me_pch8_cfg)},
 96 
 97         /* required last entry */
 98         {0, }
 99 };
100 
101 MODULE_DEVICE_TABLE(pci, mei_me_pci_tbl);
102 
103 #ifdef CONFIG_PM
104 static inline void mei_me_set_pm_domain(struct mei_device *dev);
105 static inline void mei_me_unset_pm_domain(struct mei_device *dev);
106 #else
107 static inline void mei_me_set_pm_domain(struct mei_device *dev) {}
108 static inline void mei_me_unset_pm_domain(struct mei_device *dev) {}
109 #endif /* CONFIG_PM */
110 
111 /**
112  * mei_me_quirk_probe - probe for devices that doesn't valid ME interface
113  *
114  * @pdev: PCI device structure
115  * @cfg: per generation config
116  *
117  * Return: true if ME Interface is valid, false otherwise
118  */
119 static bool mei_me_quirk_probe(struct pci_dev *pdev,
120                                 const struct mei_cfg *cfg)
121 {
122         if (cfg->quirk_probe && cfg->quirk_probe(pdev)) {
123                 dev_info(&pdev->dev, "Device doesn't have valid ME Interface\n");
124                 return false;
125         }
126 
127         return true;
128 }
129 
130 /**
131  * mei_me_probe - Device Initialization Routine
132  *
133  * @pdev: PCI device structure
134  * @ent: entry in kcs_pci_tbl
135  *
136  * Return: 0 on success, <0 on failure.
137  */
138 static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
139 {
140         const struct mei_cfg *cfg = (struct mei_cfg *)(ent->driver_data);
141         struct mei_device *dev;
142         struct mei_me_hw *hw;
143         unsigned int irqflags;
144         int err;
145 
146 
147         if (!mei_me_quirk_probe(pdev, cfg))
148                 return -ENODEV;
149 
150         /* enable pci dev */
151         err = pci_enable_device(pdev);
152         if (err) {
153                 dev_err(&pdev->dev, "failed to enable pci device.\n");
154                 goto end;
155         }
156         /* set PCI host mastering  */
157         pci_set_master(pdev);
158         /* pci request regions for mei driver */
159         err = pci_request_regions(pdev, KBUILD_MODNAME);
160         if (err) {
161                 dev_err(&pdev->dev, "failed to get pci regions.\n");
162                 goto disable_device;
163         }
164 
165         if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)) ||
166             dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64))) {
167 
168                 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
169                 if (err)
170                         err = dma_set_coherent_mask(&pdev->dev,
171                                                     DMA_BIT_MASK(32));
172         }
173         if (err) {
174                 dev_err(&pdev->dev, "No usable DMA configuration, aborting\n");
175                 goto release_regions;
176         }
177 
178 
179         /* allocates and initializes the mei dev structure */
180         dev = mei_me_dev_init(pdev, cfg);
181         if (!dev) {
182                 err = -ENOMEM;
183                 goto release_regions;
184         }
185         hw = to_me_hw(dev);
186         /* mapping  IO device memory */
187         hw->mem_addr = pci_iomap(pdev, 0, 0);
188         if (!hw->mem_addr) {
189                 dev_err(&pdev->dev, "mapping I/O device memory failure.\n");
190                 err = -ENOMEM;
191                 goto free_device;
192         }
193         pci_enable_msi(pdev);
194 
195          /* request and enable interrupt */
196         irqflags = pci_dev_msi_enabled(pdev) ? IRQF_ONESHOT : IRQF_SHARED;
197 
198         err = request_threaded_irq(pdev->irq,
199                         mei_me_irq_quick_handler,
200                         mei_me_irq_thread_handler,
201                         irqflags, KBUILD_MODNAME, dev);
202         if (err) {
203                 dev_err(&pdev->dev, "request_threaded_irq failure. irq = %d\n",
204                        pdev->irq);
205                 goto disable_msi;
206         }
207 
208         if (mei_start(dev)) {
209                 dev_err(&pdev->dev, "init hw failure.\n");
210                 err = -ENODEV;
211                 goto release_irq;
212         }
213 
214         pm_runtime_set_autosuspend_delay(&pdev->dev, MEI_ME_RPM_TIMEOUT);
215         pm_runtime_use_autosuspend(&pdev->dev);
216 
217         err = mei_register(dev, &pdev->dev);
218         if (err)
219                 goto stop;
220 
221         pci_set_drvdata(pdev, dev);
222 
223         /*
224         * For not wake-able HW runtime pm framework
225         * can't be used on pci device level.
226         * Use domain runtime pm callbacks instead.
227         */
228         if (!pci_dev_run_wake(pdev))
229                 mei_me_set_pm_domain(dev);
230 
231         if (mei_pg_is_enabled(dev))
232                 pm_runtime_put_noidle(&pdev->dev);
233 
234         dev_dbg(&pdev->dev, "initialization successful.\n");
235 
236         return 0;
237 
238 stop:
239         mei_stop(dev);
240 release_irq:
241         mei_cancel_work(dev);
242         mei_disable_interrupts(dev);
243         free_irq(pdev->irq, dev);
244 disable_msi:
245         pci_disable_msi(pdev);
246         pci_iounmap(pdev, hw->mem_addr);
247 free_device:
248         kfree(dev);
249 release_regions:
250         pci_release_regions(pdev);
251 disable_device:
252         pci_disable_device(pdev);
253 end:
254         dev_err(&pdev->dev, "initialization failed.\n");
255         return err;
256 }
257 
258 /**
259  * mei_me_remove - Device Removal Routine
260  *
261  * @pdev: PCI device structure
262  *
263  * mei_remove is called by the PCI subsystem to alert the driver
264  * that it should release a PCI device.
265  */
266 static void mei_me_remove(struct pci_dev *pdev)
267 {
268         struct mei_device *dev;
269         struct mei_me_hw *hw;
270 
271         dev = pci_get_drvdata(pdev);
272         if (!dev)
273                 return;
274 
275         if (mei_pg_is_enabled(dev))
276                 pm_runtime_get_noresume(&pdev->dev);
277 
278         hw = to_me_hw(dev);
279 
280 
281         dev_dbg(&pdev->dev, "stop\n");
282         mei_stop(dev);
283 
284         if (!pci_dev_run_wake(pdev))
285                 mei_me_unset_pm_domain(dev);
286 
287         /* disable interrupts */
288         mei_disable_interrupts(dev);
289 
290         free_irq(pdev->irq, dev);
291         pci_disable_msi(pdev);
292 
293         if (hw->mem_addr)
294                 pci_iounmap(pdev, hw->mem_addr);
295 
296         mei_deregister(dev);
297 
298         kfree(dev);
299 
300         pci_release_regions(pdev);
301         pci_disable_device(pdev);
302 
303 
304 }
305 #ifdef CONFIG_PM_SLEEP
306 static int mei_me_pci_suspend(struct device *device)
307 {
308         struct pci_dev *pdev = to_pci_dev(device);
309         struct mei_device *dev = pci_get_drvdata(pdev);
310 
311         if (!dev)
312                 return -ENODEV;
313 
314         dev_dbg(&pdev->dev, "suspend\n");
315 
316         mei_stop(dev);
317 
318         mei_disable_interrupts(dev);
319 
320         free_irq(pdev->irq, dev);
321         pci_disable_msi(pdev);
322 
323         return 0;
324 }
325 
326 static int mei_me_pci_resume(struct device *device)
327 {
328         struct pci_dev *pdev = to_pci_dev(device);
329         struct mei_device *dev;
330         unsigned int irqflags;
331         int err;
332 
333         dev = pci_get_drvdata(pdev);
334         if (!dev)
335                 return -ENODEV;
336 
337         pci_enable_msi(pdev);
338 
339         irqflags = pci_dev_msi_enabled(pdev) ? IRQF_ONESHOT : IRQF_SHARED;
340 
341         /* request and enable interrupt */
342         err = request_threaded_irq(pdev->irq,
343                         mei_me_irq_quick_handler,
344                         mei_me_irq_thread_handler,
345                         irqflags, KBUILD_MODNAME, dev);
346 
347         if (err) {
348                 dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
349                                 pdev->irq);
350                 return err;
351         }
352 
353         err = mei_restart(dev);
354         if (err)
355                 return err;
356 
357         /* Start timer if stopped in suspend */
358         schedule_delayed_work(&dev->timer_work, HZ);
359 
360         return 0;
361 }
362 #endif /* CONFIG_PM_SLEEP */
363 
364 #ifdef CONFIG_PM
365 static int mei_me_pm_runtime_idle(struct device *device)
366 {
367         struct pci_dev *pdev = to_pci_dev(device);
368         struct mei_device *dev;
369 
370         dev_dbg(&pdev->dev, "rpm: me: runtime_idle\n");
371 
372         dev = pci_get_drvdata(pdev);
373         if (!dev)
374                 return -ENODEV;
375         if (mei_write_is_idle(dev))
376                 pm_runtime_autosuspend(device);
377 
378         return -EBUSY;
379 }
380 
381 static int mei_me_pm_runtime_suspend(struct device *device)
382 {
383         struct pci_dev *pdev = to_pci_dev(device);
384         struct mei_device *dev;
385         int ret;
386 
387         dev_dbg(&pdev->dev, "rpm: me: runtime suspend\n");
388 
389         dev = pci_get_drvdata(pdev);
390         if (!dev)
391                 return -ENODEV;
392 
393         mutex_lock(&dev->device_lock);
394 
395         if (mei_write_is_idle(dev))
396                 ret = mei_me_pg_enter_sync(dev);
397         else
398                 ret = -EAGAIN;
399 
400         mutex_unlock(&dev->device_lock);
401 
402         dev_dbg(&pdev->dev, "rpm: me: runtime suspend ret=%d\n", ret);
403 
404         if (ret && ret != -EAGAIN)
405                 schedule_work(&dev->reset_work);
406 
407         return ret;
408 }
409 
410 static int mei_me_pm_runtime_resume(struct device *device)
411 {
412         struct pci_dev *pdev = to_pci_dev(device);
413         struct mei_device *dev;
414         int ret;
415 
416         dev_dbg(&pdev->dev, "rpm: me: runtime resume\n");
417 
418         dev = pci_get_drvdata(pdev);
419         if (!dev)
420                 return -ENODEV;
421 
422         mutex_lock(&dev->device_lock);
423 
424         ret = mei_me_pg_exit_sync(dev);
425 
426         mutex_unlock(&dev->device_lock);
427 
428         dev_dbg(&pdev->dev, "rpm: me: runtime resume ret = %d\n", ret);
429 
430         if (ret)
431                 schedule_work(&dev->reset_work);
432 
433         return ret;
434 }
435 
436 /**
437  * mei_me_set_pm_domain - fill and set pm domain structure for device
438  *
439  * @dev: mei_device
440  */
441 static inline void mei_me_set_pm_domain(struct mei_device *dev)
442 {
443         struct pci_dev *pdev  = to_pci_dev(dev->dev);
444 
445         if (pdev->dev.bus && pdev->dev.bus->pm) {
446                 dev->pg_domain.ops = *pdev->dev.bus->pm;
447 
448                 dev->pg_domain.ops.runtime_suspend = mei_me_pm_runtime_suspend;
449                 dev->pg_domain.ops.runtime_resume = mei_me_pm_runtime_resume;
450                 dev->pg_domain.ops.runtime_idle = mei_me_pm_runtime_idle;
451 
452                 dev_pm_domain_set(&pdev->dev, &dev->pg_domain);
453         }
454 }
455 
456 /**
457  * mei_me_unset_pm_domain - clean pm domain structure for device
458  *
459  * @dev: mei_device
460  */
461 static inline void mei_me_unset_pm_domain(struct mei_device *dev)
462 {
463         /* stop using pm callbacks if any */
464         dev_pm_domain_set(dev->dev, NULL);
465 }
466 
467 static const struct dev_pm_ops mei_me_pm_ops = {
468         SET_SYSTEM_SLEEP_PM_OPS(mei_me_pci_suspend,
469                                 mei_me_pci_resume)
470         SET_RUNTIME_PM_OPS(
471                 mei_me_pm_runtime_suspend,
472                 mei_me_pm_runtime_resume,
473                 mei_me_pm_runtime_idle)
474 };
475 
476 #define MEI_ME_PM_OPS   (&mei_me_pm_ops)
477 #else
478 #define MEI_ME_PM_OPS   NULL
479 #endif /* CONFIG_PM */
480 /*
481  *  PCI driver structure
482  */
483 static struct pci_driver mei_me_driver = {
484         .name = KBUILD_MODNAME,
485         .id_table = mei_me_pci_tbl,
486         .probe = mei_me_probe,
487         .remove = mei_me_remove,
488         .shutdown = mei_me_remove,
489         .driver.pm = MEI_ME_PM_OPS,
490 };
491 
492 module_pci_driver(mei_me_driver);
493 
494 MODULE_AUTHOR("Intel Corporation");
495 MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
496 MODULE_LICENSE("GPL v2");
497 

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