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