Version:  2.0.40 2.2.26 2.4.37 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7

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_cfg)},
 89         {MEI_PCI_DEVICE(MEI_DEV_ID_SPT_H_2, mei_me_pch8_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         /* required last entry */
 95         {0, }
 96 };
 97 
 98 MODULE_DEVICE_TABLE(pci, mei_me_pci_tbl);
 99 
100 #ifdef CONFIG_PM
101 static inline void mei_me_set_pm_domain(struct mei_device *dev);
102 static inline void mei_me_unset_pm_domain(struct mei_device *dev);
103 #else
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 #endif /* CONFIG_PM */
107 
108 /**
109  * mei_me_quirk_probe - probe for devices that doesn't valid ME interface
110  *
111  * @pdev: PCI device structure
112  * @cfg: per generation config
113  *
114  * Return: true if ME Interface is valid, false otherwise
115  */
116 static bool mei_me_quirk_probe(struct pci_dev *pdev,
117                                 const struct mei_cfg *cfg)
118 {
119         if (cfg->quirk_probe && cfg->quirk_probe(pdev)) {
120                 dev_info(&pdev->dev, "Device doesn't have valid ME Interface\n");
121                 return false;
122         }
123 
124         return true;
125 }
126 
127 /**
128  * mei_me_probe - Device Initialization Routine
129  *
130  * @pdev: PCI device structure
131  * @ent: entry in kcs_pci_tbl
132  *
133  * Return: 0 on success, <0 on failure.
134  */
135 static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
136 {
137         const struct mei_cfg *cfg = (struct mei_cfg *)(ent->driver_data);
138         struct mei_device *dev;
139         struct mei_me_hw *hw;
140         unsigned int irqflags;
141         int err;
142 
143 
144         if (!mei_me_quirk_probe(pdev, cfg))
145                 return -ENODEV;
146 
147         /* enable pci dev */
148         err = pci_enable_device(pdev);
149         if (err) {
150                 dev_err(&pdev->dev, "failed to enable pci device.\n");
151                 goto end;
152         }
153         /* set PCI host mastering  */
154         pci_set_master(pdev);
155         /* pci request regions for mei driver */
156         err = pci_request_regions(pdev, KBUILD_MODNAME);
157         if (err) {
158                 dev_err(&pdev->dev, "failed to get pci regions.\n");
159                 goto disable_device;
160         }
161 
162         if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)) ||
163             dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64))) {
164 
165                 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
166                 if (err)
167                         err = dma_set_coherent_mask(&pdev->dev,
168                                                     DMA_BIT_MASK(32));
169         }
170         if (err) {
171                 dev_err(&pdev->dev, "No usable DMA configuration, aborting\n");
172                 goto release_regions;
173         }
174 
175 
176         /* allocates and initializes the mei dev structure */
177         dev = mei_me_dev_init(pdev, cfg);
178         if (!dev) {
179                 err = -ENOMEM;
180                 goto release_regions;
181         }
182         hw = to_me_hw(dev);
183         /* mapping  IO device memory */
184         hw->mem_addr = pci_iomap(pdev, 0, 0);
185         if (!hw->mem_addr) {
186                 dev_err(&pdev->dev, "mapping I/O device memory failure.\n");
187                 err = -ENOMEM;
188                 goto free_device;
189         }
190         pci_enable_msi(pdev);
191 
192          /* request and enable interrupt */
193         irqflags = pci_dev_msi_enabled(pdev) ? IRQF_ONESHOT : IRQF_SHARED;
194 
195         err = request_threaded_irq(pdev->irq,
196                         mei_me_irq_quick_handler,
197                         mei_me_irq_thread_handler,
198                         irqflags, KBUILD_MODNAME, dev);
199         if (err) {
200                 dev_err(&pdev->dev, "request_threaded_irq failure. irq = %d\n",
201                        pdev->irq);
202                 goto disable_msi;
203         }
204 
205         if (mei_start(dev)) {
206                 dev_err(&pdev->dev, "init hw failure.\n");
207                 err = -ENODEV;
208                 goto release_irq;
209         }
210 
211         pm_runtime_set_autosuspend_delay(&pdev->dev, MEI_ME_RPM_TIMEOUT);
212         pm_runtime_use_autosuspend(&pdev->dev);
213 
214         err = mei_register(dev, &pdev->dev);
215         if (err)
216                 goto stop;
217 
218         pci_set_drvdata(pdev, dev);
219 
220         schedule_delayed_work(&dev->timer_work, HZ);
221 
222         /*
223         * For not wake-able HW runtime pm framework
224         * can't be used on pci device level.
225         * Use domain runtime pm callbacks instead.
226         */
227         if (!pci_dev_run_wake(pdev))
228                 mei_me_set_pm_domain(dev);
229 
230         if (mei_pg_is_enabled(dev))
231                 pm_runtime_put_noidle(&pdev->dev);
232 
233         dev_dbg(&pdev->dev, "initialization successful.\n");
234 
235         return 0;
236 
237 stop:
238         mei_stop(dev);
239 release_irq:
240         mei_cancel_work(dev);
241         mei_disable_interrupts(dev);
242         free_irq(pdev->irq, dev);
243 disable_msi:
244         pci_disable_msi(pdev);
245         pci_iounmap(pdev, hw->mem_addr);
246 free_device:
247         kfree(dev);
248 release_regions:
249         pci_release_regions(pdev);
250 disable_device:
251         pci_disable_device(pdev);
252 end:
253         dev_err(&pdev->dev, "initialization failed.\n");
254         return err;
255 }
256 
257 /**
258  * mei_me_remove - Device Removal Routine
259  *
260  * @pdev: PCI device structure
261  *
262  * mei_remove is called by the PCI subsystem to alert the driver
263  * that it should release a PCI device.
264  */
265 static void mei_me_remove(struct pci_dev *pdev)
266 {
267         struct mei_device *dev;
268         struct mei_me_hw *hw;
269 
270         dev = pci_get_drvdata(pdev);
271         if (!dev)
272                 return;
273 
274         if (mei_pg_is_enabled(dev))
275                 pm_runtime_get_noresume(&pdev->dev);
276 
277         hw = to_me_hw(dev);
278 
279 
280         dev_dbg(&pdev->dev, "stop\n");
281         mei_stop(dev);
282 
283         if (!pci_dev_run_wake(pdev))
284                 mei_me_unset_pm_domain(dev);
285 
286         /* disable interrupts */
287         mei_disable_interrupts(dev);
288 
289         free_irq(pdev->irq, dev);
290         pci_disable_msi(pdev);
291 
292         if (hw->mem_addr)
293                 pci_iounmap(pdev, hw->mem_addr);
294 
295         mei_deregister(dev);
296 
297         kfree(dev);
298 
299         pci_release_regions(pdev);
300         pci_disable_device(pdev);
301 
302 
303 }
304 #ifdef CONFIG_PM_SLEEP
305 static int mei_me_pci_suspend(struct device *device)
306 {
307         struct pci_dev *pdev = to_pci_dev(device);
308         struct mei_device *dev = pci_get_drvdata(pdev);
309 
310         if (!dev)
311                 return -ENODEV;
312 
313         dev_dbg(&pdev->dev, "suspend\n");
314 
315         mei_stop(dev);
316 
317         mei_disable_interrupts(dev);
318 
319         free_irq(pdev->irq, dev);
320         pci_disable_msi(pdev);
321 
322         return 0;
323 }
324 
325 static int mei_me_pci_resume(struct device *device)
326 {
327         struct pci_dev *pdev = to_pci_dev(device);
328         struct mei_device *dev;
329         unsigned int irqflags;
330         int err;
331 
332         dev = pci_get_drvdata(pdev);
333         if (!dev)
334                 return -ENODEV;
335 
336         pci_enable_msi(pdev);
337 
338         irqflags = pci_dev_msi_enabled(pdev) ? IRQF_ONESHOT : IRQF_SHARED;
339 
340         /* request and enable interrupt */
341         err = request_threaded_irq(pdev->irq,
342                         mei_me_irq_quick_handler,
343                         mei_me_irq_thread_handler,
344                         irqflags, KBUILD_MODNAME, dev);
345 
346         if (err) {
347                 dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
348                                 pdev->irq);
349                 return err;
350         }
351 
352         err = mei_restart(dev);
353         if (err)
354                 return err;
355 
356         /* Start timer if stopped in suspend */
357         schedule_delayed_work(&dev->timer_work, HZ);
358 
359         return 0;
360 }
361 #endif /* CONFIG_PM_SLEEP */
362 
363 #ifdef CONFIG_PM
364 static int mei_me_pm_runtime_idle(struct device *device)
365 {
366         struct pci_dev *pdev = to_pci_dev(device);
367         struct mei_device *dev;
368 
369         dev_dbg(&pdev->dev, "rpm: me: runtime_idle\n");
370 
371         dev = pci_get_drvdata(pdev);
372         if (!dev)
373                 return -ENODEV;
374         if (mei_write_is_idle(dev))
375                 pm_runtime_autosuspend(device);
376 
377         return -EBUSY;
378 }
379 
380 static int mei_me_pm_runtime_suspend(struct device *device)
381 {
382         struct pci_dev *pdev = to_pci_dev(device);
383         struct mei_device *dev;
384         int ret;
385 
386         dev_dbg(&pdev->dev, "rpm: me: runtime suspend\n");
387 
388         dev = pci_get_drvdata(pdev);
389         if (!dev)
390                 return -ENODEV;
391 
392         mutex_lock(&dev->device_lock);
393 
394         if (mei_write_is_idle(dev))
395                 ret = mei_me_pg_enter_sync(dev);
396         else
397                 ret = -EAGAIN;
398 
399         mutex_unlock(&dev->device_lock);
400 
401         dev_dbg(&pdev->dev, "rpm: me: runtime suspend ret=%d\n", ret);
402 
403         return ret;
404 }
405 
406 static int mei_me_pm_runtime_resume(struct device *device)
407 {
408         struct pci_dev *pdev = to_pci_dev(device);
409         struct mei_device *dev;
410         int ret;
411 
412         dev_dbg(&pdev->dev, "rpm: me: runtime resume\n");
413 
414         dev = pci_get_drvdata(pdev);
415         if (!dev)
416                 return -ENODEV;
417 
418         mutex_lock(&dev->device_lock);
419 
420         ret = mei_me_pg_exit_sync(dev);
421 
422         mutex_unlock(&dev->device_lock);
423 
424         dev_dbg(&pdev->dev, "rpm: me: runtime resume ret = %d\n", ret);
425 
426         return ret;
427 }
428 
429 /**
430  * mei_me_set_pm_domain - fill and set pm domain structure for device
431  *
432  * @dev: mei_device
433  */
434 static inline void mei_me_set_pm_domain(struct mei_device *dev)
435 {
436         struct pci_dev *pdev  = to_pci_dev(dev->dev);
437 
438         if (pdev->dev.bus && pdev->dev.bus->pm) {
439                 dev->pg_domain.ops = *pdev->dev.bus->pm;
440 
441                 dev->pg_domain.ops.runtime_suspend = mei_me_pm_runtime_suspend;
442                 dev->pg_domain.ops.runtime_resume = mei_me_pm_runtime_resume;
443                 dev->pg_domain.ops.runtime_idle = mei_me_pm_runtime_idle;
444 
445                 dev_pm_domain_set(&pdev->dev, &dev->pg_domain);
446         }
447 }
448 
449 /**
450  * mei_me_unset_pm_domain - clean pm domain structure for device
451  *
452  * @dev: mei_device
453  */
454 static inline void mei_me_unset_pm_domain(struct mei_device *dev)
455 {
456         /* stop using pm callbacks if any */
457         dev_pm_domain_set(dev->dev, NULL);
458 }
459 
460 static const struct dev_pm_ops mei_me_pm_ops = {
461         SET_SYSTEM_SLEEP_PM_OPS(mei_me_pci_suspend,
462                                 mei_me_pci_resume)
463         SET_RUNTIME_PM_OPS(
464                 mei_me_pm_runtime_suspend,
465                 mei_me_pm_runtime_resume,
466                 mei_me_pm_runtime_idle)
467 };
468 
469 #define MEI_ME_PM_OPS   (&mei_me_pm_ops)
470 #else
471 #define MEI_ME_PM_OPS   NULL
472 #endif /* CONFIG_PM */
473 /*
474  *  PCI driver structure
475  */
476 static struct pci_driver mei_me_driver = {
477         .name = KBUILD_MODNAME,
478         .id_table = mei_me_pci_tbl,
479         .probe = mei_me_probe,
480         .remove = mei_me_remove,
481         .shutdown = mei_me_remove,
482         .driver.pm = MEI_ME_PM_OPS,
483 };
484 
485 module_pci_driver(mei_me_driver);
486 
487 MODULE_AUTHOR("Intel Corporation");
488 MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
489 MODULE_LICENSE("GPL v2");
490 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us