drivers/misc/mei/pci-me.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2003-2019, Intel Corporation. All rights reserved.
   4  * Intel Management Engine Interface (Intel MEI) Linux driver
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/moduleparam.h>
   9 #include <linux/kernel.h>
  10 #include <linux/device.h>
  11 #include <linux/fs.h>
  12 #include <linux/errno.h>
  13 #include <linux/types.h>
  14 #include <linux/fcntl.h>
  15 #include <linux/pci.h>
  16 #include <linux/poll.h>
  17 #include <linux/ioctl.h>
  18 #include <linux/cdev.h>
  19 #include <linux/sched.h>
  20 #include <linux/uuid.h>
  21 #include <linux/compat.h>
  22 #include <linux/jiffies.h>
  23 #include <linux/interrupt.h>
  24
  25 #include <linux/pm_domain.h>
  26 #include <linux/pm_runtime.h>
  27
  28 #include <linux/mei.h>
  29
  30 #include "mei_dev.h"
  31 #include "client.h"
  32 #include "hw-me-regs.h"
  33 #include "hw-me.h"
  34
  35 /* mei_pci_tbl - PCI Device ID Table */
  36 static const struct pci_device_id mei_me_pci_tbl[] = {
  37         {MEI_PCI_DEVICE(MEI_DEV_ID_82946GZ, MEI_ME_ICH_CFG)},
  38         {MEI_PCI_DEVICE(MEI_DEV_ID_82G35, MEI_ME_ICH_CFG)},
  39         {MEI_PCI_DEVICE(MEI_DEV_ID_82Q965, MEI_ME_ICH_CFG)},
  40         {MEI_PCI_DEVICE(MEI_DEV_ID_82G965, MEI_ME_ICH_CFG)},
  41         {MEI_PCI_DEVICE(MEI_DEV_ID_82GM965, MEI_ME_ICH_CFG)},
  42         {MEI_PCI_DEVICE(MEI_DEV_ID_82GME965, MEI_ME_ICH_CFG)},
  43         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82Q35, MEI_ME_ICH_CFG)},
  44         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82G33, MEI_ME_ICH_CFG)},
  45         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82Q33, MEI_ME_ICH_CFG)},
  46         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82X38, MEI_ME_ICH_CFG)},
  47         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_3200, MEI_ME_ICH_CFG)},
  48
  49         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_6, MEI_ME_ICH_CFG)},
  50         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_7, MEI_ME_ICH_CFG)},
  51         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_8, MEI_ME_ICH_CFG)},
  52         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_9, MEI_ME_ICH_CFG)},
  53         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_10, MEI_ME_ICH_CFG)},
  54         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_1, MEI_ME_ICH_CFG)},
  55         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_2, MEI_ME_ICH_CFG)},
  56         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_3, MEI_ME_ICH_CFG)},
  57         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_4, MEI_ME_ICH_CFG)},
  58
  59         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_1, MEI_ME_ICH10_CFG)},
  60         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_2, MEI_ME_ICH10_CFG)},
  61         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_3, MEI_ME_ICH10_CFG)},
  62         {MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_4, MEI_ME_ICH10_CFG)},
  63
  64         {MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_1, MEI_ME_PCH_CFG)},
  65         {MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_2, MEI_ME_PCH_CFG)},
  66         {MEI_PCI_DEVICE(MEI_DEV_ID_CPT_1, MEI_ME_PCH_CPT_PBG_CFG)},
  67         {MEI_PCI_DEVICE(MEI_DEV_ID_PBG_1, MEI_ME_PCH_CPT_PBG_CFG)},
  68         {MEI_PCI_DEVICE(MEI_DEV_ID_PPT_1, MEI_ME_PCH_CFG)},
  69         {MEI_PCI_DEVICE(MEI_DEV_ID_PPT_2, MEI_ME_PCH_CFG)},
  70         {MEI_PCI_DEVICE(MEI_DEV_ID_PPT_3, MEI_ME_PCH_CFG)},
  71         {MEI_PCI_DEVICE(MEI_DEV_ID_LPT_H, MEI_ME_PCH8_SPS_CFG)},
  72         {MEI_PCI_DEVICE(MEI_DEV_ID_LPT_W, MEI_ME_PCH8_SPS_CFG)},
  73         {MEI_PCI_DEVICE(MEI_DEV_ID_LPT_LP, MEI_ME_PCH8_CFG)},
  74         {MEI_PCI_DEVICE(MEI_DEV_ID_LPT_HR, MEI_ME_PCH8_SPS_CFG)},
  75         {MEI_PCI_DEVICE(MEI_DEV_ID_WPT_LP, MEI_ME_PCH8_CFG)},
  76         {MEI_PCI_DEVICE(MEI_DEV_ID_WPT_LP_2, MEI_ME_PCH8_CFG)},
  77
  78         {MEI_PCI_DEVICE(MEI_DEV_ID_SPT, MEI_ME_PCH8_CFG)},
  79         {MEI_PCI_DEVICE(MEI_DEV_ID_SPT_2, MEI_ME_PCH8_CFG)},
  80         {MEI_PCI_DEVICE(MEI_DEV_ID_SPT_H, MEI_ME_PCH8_SPS_CFG)},
  81         {MEI_PCI_DEVICE(MEI_DEV_ID_SPT_H_2, MEI_ME_PCH8_SPS_CFG)},
  82         {MEI_PCI_DEVICE(MEI_DEV_ID_LBG, MEI_ME_PCH12_CFG)},
  83
  84         {MEI_PCI_DEVICE(MEI_DEV_ID_BXT_M, MEI_ME_PCH8_CFG)},
  85         {MEI_PCI_DEVICE(MEI_DEV_ID_APL_I, MEI_ME_PCH8_CFG)},
  86
  87         {MEI_PCI_DEVICE(MEI_DEV_ID_DNV_IE, MEI_ME_PCH8_CFG)},
  88
  89         {MEI_PCI_DEVICE(MEI_DEV_ID_GLK, MEI_ME_PCH8_CFG)},
  90
  91         {MEI_PCI_DEVICE(MEI_DEV_ID_KBP, MEI_ME_PCH8_CFG)},
  92         {MEI_PCI_DEVICE(MEI_DEV_ID_KBP_2, MEI_ME_PCH8_CFG)},
  93
  94         {MEI_PCI_DEVICE(MEI_DEV_ID_CNP_LP, MEI_ME_PCH12_CFG)},
  95         {MEI_PCI_DEVICE(MEI_DEV_ID_CNP_LP_4, MEI_ME_PCH8_CFG)},
  96         {MEI_PCI_DEVICE(MEI_DEV_ID_CNP_H, MEI_ME_PCH12_CFG)},
  97         {MEI_PCI_DEVICE(MEI_DEV_ID_CNP_H_4, MEI_ME_PCH8_CFG)},
  98
  99         {MEI_PCI_DEVICE(MEI_DEV_ID_ICP_LP, MEI_ME_PCH12_CFG)},
 100
 101         {MEI_PCI_DEVICE(MEI_DEV_ID_TGP_LP, MEI_ME_PCH12_CFG)},
 102
 103         {MEI_PCI_DEVICE(MEI_DEV_ID_MCC, MEI_ME_PCH12_CFG)},
 104         {MEI_PCI_DEVICE(MEI_DEV_ID_MCC_4, MEI_ME_PCH8_CFG)},
 105
 106         /* required last entry */
 107         {0, }
 108 };
 109
 110 MODULE_DEVICE_TABLE(pci, mei_me_pci_tbl);
 111
 112 #ifdef CONFIG_PM
 113 static inline void mei_me_set_pm_domain(struct mei_device *dev);
 114 static inline void mei_me_unset_pm_domain(struct mei_device *dev);
 115 #else
 116 static inline void mei_me_set_pm_domain(struct mei_device *dev) {}
 117 static inline void mei_me_unset_pm_domain(struct mei_device *dev) {}
 118 #endif /* CONFIG_PM */
 119
 120 /**
 121  * mei_me_quirk_probe - probe for devices that doesn't valid ME interface
 122  *
 123  * @pdev: PCI device structure
 124  * @cfg: per generation config
 125  *
 126  * Return: true if ME Interface is valid, false otherwise
 127  */
 128 static bool mei_me_quirk_probe(struct pci_dev *pdev,
 129                                 const struct mei_cfg *cfg)
 130 {
 131         if (cfg->quirk_probe && cfg->quirk_probe(pdev)) {
 132                 dev_info(&pdev->dev, "Device doesn't have valid ME Interface\n");
 133                 return false;
 134         }
 135
 136         return true;
 137 }
 138
 139 /**
 140  * mei_me_probe - Device Initialization Routine
 141  *
 142  * @pdev: PCI device structure
 143  * @ent: entry in kcs_pci_tbl
 144  *
 145  * Return: 0 on success, <0 on failure.
 146  */
 147 static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 148 {
 149         const struct mei_cfg *cfg;
 150         struct mei_device *dev;
 151         struct mei_me_hw *hw;
 152         unsigned int irqflags;
 153         int err;
 154
 155         cfg = mei_me_get_cfg(ent->driver_data);
 156         if (!cfg)
 157                 return -ENODEV;
 158
 159         if (!mei_me_quirk_probe(pdev, cfg))
 160                 return -ENODEV;
 161
 162         /* enable pci dev */
 163         err = pcim_enable_device(pdev);
 164         if (err) {
 165                 dev_err(&pdev->dev, "failed to enable pci device.\n");
 166                 goto end;
 167         }
 168         /* set PCI host mastering  */
 169         pci_set_master(pdev);
 170         /* pci request regions and mapping IO device memory for mei driver */
 171         err = pcim_iomap_regions(pdev, BIT(0), KBUILD_MODNAME);
 172         if (err) {
 173                 dev_err(&pdev->dev, "failed to get pci regions.\n");
 174                 goto end;
 175         }
 176
 177         if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)) ||
 178             dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64))) {
 179
 180                 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
 181                 if (err)
 182                         err = dma_set_coherent_mask(&pdev->dev,
 183                                                     DMA_BIT_MASK(32));
 184         }
 185         if (err) {
 186                 dev_err(&pdev->dev, "No usable DMA configuration, aborting\n");
 187                 goto end;
 188         }
 189
 190         /* allocates and initializes the mei dev structure */
 191         dev = mei_me_dev_init(pdev, cfg);
 192         if (!dev) {
 193                 err = -ENOMEM;
 194                 goto end;
 195         }
 196         hw = to_me_hw(dev);
 197         hw->mem_addr = pcim_iomap_table(pdev)[0];
 198
 199         pci_enable_msi(pdev);
 200
 201          /* request and enable interrupt */
 202         irqflags = pci_dev_msi_enabled(pdev) ? IRQF_ONESHOT : IRQF_SHARED;
 203
 204         err = request_threaded_irq(pdev->irq,
 205                         mei_me_irq_quick_handler,
 206                         mei_me_irq_thread_handler,
 207                         irqflags, KBUILD_MODNAME, dev);
 208         if (err) {
 209                 dev_err(&pdev->dev, "request_threaded_irq failure. irq = %d\n",
 210                        pdev->irq);
 211                 goto end;
 212         }
 213
 214         if (mei_start(dev)) {
 215                 dev_err(&pdev->dev, "init hw failure.\n");
 216                 err = -ENODEV;
 217                 goto release_irq;
 218         }
 219
 220         pm_runtime_set_autosuspend_delay(&pdev->dev, MEI_ME_RPM_TIMEOUT);
 221         pm_runtime_use_autosuspend(&pdev->dev);
 222
 223         err = mei_register(dev, &pdev->dev);
 224         if (err)
 225                 goto stop;
 226
 227         pci_set_drvdata(pdev, dev);
 228
 229         /*
 230          * MEI requires to resume from runtime suspend mode
 231          * in order to perform link reset flow upon system suspend.
 232          */
 233         dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_NEVER_SKIP);
 234
 235         /*
 236          * ME maps runtime suspend/resume to D0i states,
 237          * hence we need to go around native PCI runtime service which
 238          * eventually brings the device into D3cold/hot state,
 239          * but the mei device cannot wake up from D3 unlike from D0i3.
 240          * To get around the PCI device native runtime pm,
 241          * ME uses runtime pm domain handlers which take precedence
 242          * over the driver's pm handlers.
 243          */
 244         mei_me_set_pm_domain(dev);
 245
 246         if (mei_pg_is_enabled(dev)) {
 247                 pm_runtime_put_noidle(&pdev->dev);
 248                 if (hw->d0i3_supported)
 249                         pm_runtime_allow(&pdev->dev);
 250         }
 251
 252         dev_dbg(&pdev->dev, "initialization successful.\n");
 253
 254         return 0;
 255
 256 stop:
 257         mei_stop(dev);
 258 release_irq:
 259         mei_cancel_work(dev);
 260         mei_disable_interrupts(dev);
 261         free_irq(pdev->irq, dev);
 262 end:
 263         dev_err(&pdev->dev, "initialization failed.\n");
 264         return err;
 265 }
 266
 267 /**
 268  * mei_me_shutdown - Device Removal Routine
 269  *
 270  * @pdev: PCI device structure
 271  *
 272  * mei_me_shutdown is called from the reboot notifier
 273  * it's a simplified version of remove so we go down
 274  * faster.
 275  */
 276 static void mei_me_shutdown(struct pci_dev *pdev)
 277 {
 278         struct mei_device *dev;
 279
 280         dev = pci_get_drvdata(pdev);
 281         if (!dev)
 282                 return;
 283
 284         dev_dbg(&pdev->dev, "shutdown\n");
 285         mei_stop(dev);
 286
 287         mei_me_unset_pm_domain(dev);
 288
 289         mei_disable_interrupts(dev);
 290         free_irq(pdev->irq, dev);
 291 }
 292
 293 /**
 294  * mei_me_remove - Device Removal Routine
 295  *
 296  * @pdev: PCI device structure
 297  *
 298  * mei_me_remove is called by the PCI subsystem to alert the driver
 299  * that it should release a PCI device.
 300  */
 301 static void mei_me_remove(struct pci_dev *pdev)
 302 {
 303         struct mei_device *dev;
 304
 305         dev = pci_get_drvdata(pdev);
 306         if (!dev)
 307                 return;
 308
 309         if (mei_pg_is_enabled(dev))
 310                 pm_runtime_get_noresume(&pdev->dev);
 311
 312         dev_dbg(&pdev->dev, "stop\n");
 313         mei_stop(dev);
 314
 315         mei_me_unset_pm_domain(dev);
 316
 317         mei_disable_interrupts(dev);
 318
 319         free_irq(pdev->irq, dev);
 320
 321         mei_deregister(dev);
 322 }
 323
 324 #ifdef CONFIG_PM_SLEEP
 325 static int mei_me_pci_suspend(struct device *device)
 326 {
 327         struct pci_dev *pdev = to_pci_dev(device);
 328         struct mei_device *dev = pci_get_drvdata(pdev);
 329
 330         if (!dev)
 331                 return -ENODEV;
 332
 333         dev_dbg(&pdev->dev, "suspend\n");
 334
 335         mei_stop(dev);
 336
 337         mei_disable_interrupts(dev);
 338
 339         free_irq(pdev->irq, dev);
 340         pci_disable_msi(pdev);
 341
 342         return 0;
 343 }
 344
 345 static int mei_me_pci_resume(struct device *device)
 346 {
 347         struct pci_dev *pdev = to_pci_dev(device);
 348         struct mei_device *dev;
 349         unsigned int irqflags;
 350         int err;
 351
 352         dev = pci_get_drvdata(pdev);
 353         if (!dev)
 354                 return -ENODEV;
 355
 356         pci_enable_msi(pdev);
 357
 358         irqflags = pci_dev_msi_enabled(pdev) ? IRQF_ONESHOT : IRQF_SHARED;
 359
 360         /* request and enable interrupt */
 361         err = request_threaded_irq(pdev->irq,
 362                         mei_me_irq_quick_handler,
 363                         mei_me_irq_thread_handler,
 364                         irqflags, KBUILD_MODNAME, dev);
 365
 366         if (err) {
 367                 dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
 368                                 pdev->irq);
 369                 return err;
 370         }
 371
 372         err = mei_restart(dev);
 373         if (err)
 374                 return err;
 375
 376         /* Start timer if stopped in suspend */
 377         schedule_delayed_work(&dev->timer_work, HZ);
 378
 379         return 0;
 380 }
 381 #endif /* CONFIG_PM_SLEEP */
 382
 383 #ifdef CONFIG_PM
 384 static int mei_me_pm_runtime_idle(struct device *device)
 385 {
 386         struct mei_device *dev;
 387
 388         dev_dbg(device, "rpm: me: runtime_idle\n");
 389
 390         dev = dev_get_drvdata(device);
 391         if (!dev)
 392                 return -ENODEV;
 393         if (mei_write_is_idle(dev))
 394                 pm_runtime_autosuspend(device);
 395
 396         return -EBUSY;
 397 }
 398
 399 static int mei_me_pm_runtime_suspend(struct device *device)
 400 {
 401         struct mei_device *dev;
 402         int ret;
 403
 404         dev_dbg(device, "rpm: me: runtime suspend\n");
 405
 406         dev = dev_get_drvdata(device);
 407         if (!dev)
 408                 return -ENODEV;
 409
 410         mutex_lock(&dev->device_lock);
 411
 412         if (mei_write_is_idle(dev))
 413                 ret = mei_me_pg_enter_sync(dev);
 414         else
 415                 ret = -EAGAIN;
 416
 417         mutex_unlock(&dev->device_lock);
 418
 419         dev_dbg(device, "rpm: me: runtime suspend ret=%d\n", ret);
 420
 421         if (ret && ret != -EAGAIN)
 422                 schedule_work(&dev->reset_work);
 423
 424         return ret;
 425 }
 426
 427 static int mei_me_pm_runtime_resume(struct device *device)
 428 {
 429         struct mei_device *dev;
 430         int ret;
 431
 432         dev_dbg(device, "rpm: me: runtime resume\n");
 433
 434         dev = dev_get_drvdata(device);
 435         if (!dev)
 436                 return -ENODEV;
 437
 438         mutex_lock(&dev->device_lock);
 439
 440         ret = mei_me_pg_exit_sync(dev);
 441
 442         mutex_unlock(&dev->device_lock);
 443
 444         dev_dbg(device, "rpm: me: runtime resume ret = %d\n", ret);
 445
 446         if (ret)
 447                 schedule_work(&dev->reset_work);
 448
 449         return ret;
 450 }
 451
 452 /**
 453  * mei_me_set_pm_domain - fill and set pm domain structure for device
 454  *
 455  * @dev: mei_device
 456  */
 457 static inline void mei_me_set_pm_domain(struct mei_device *dev)
 458 {
 459         struct pci_dev *pdev  = to_pci_dev(dev->dev);
 460
 461         if (pdev->dev.bus && pdev->dev.bus->pm) {
 462                 dev->pg_domain.ops = *pdev->dev.bus->pm;
 463
 464                 dev->pg_domain.ops.runtime_suspend = mei_me_pm_runtime_suspend;
 465                 dev->pg_domain.ops.runtime_resume = mei_me_pm_runtime_resume;
 466                 dev->pg_domain.ops.runtime_idle = mei_me_pm_runtime_idle;
 467
 468                 dev_pm_domain_set(&pdev->dev, &dev->pg_domain);
 469         }
 470 }
 471
 472 /**
 473  * mei_me_unset_pm_domain - clean pm domain structure for device
 474  *
 475  * @dev: mei_device
 476  */
 477 static inline void mei_me_unset_pm_domain(struct mei_device *dev)
 478 {
 479         /* stop using pm callbacks if any */
 480         dev_pm_domain_set(dev->dev, NULL);
 481 }
 482
 483 static const struct dev_pm_ops mei_me_pm_ops = {
 484         SET_SYSTEM_SLEEP_PM_OPS(mei_me_pci_suspend,
 485                                 mei_me_pci_resume)
 486         SET_RUNTIME_PM_OPS(
 487                 mei_me_pm_runtime_suspend,
 488                 mei_me_pm_runtime_resume,
 489                 mei_me_pm_runtime_idle)
 490 };
 491
 492 #define MEI_ME_PM_OPS   (&mei_me_pm_ops)
 493 #else
 494 #define MEI_ME_PM_OPS   NULL
 495 #endif /* CONFIG_PM */
 496 /*
 497  *  PCI driver structure
 498  */
 499 static struct pci_driver mei_me_driver = {
 500         .name = KBUILD_MODNAME,
 501         .id_table = mei_me_pci_tbl,
 502         .probe = mei_me_probe,
 503         .remove = mei_me_remove,
 504         .shutdown = mei_me_shutdown,
 505         .driver.pm = MEI_ME_PM_OPS,
 506         .driver.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 507 };
 508
 509 module_pci_driver(mei_me_driver);
 510
 511 MODULE_AUTHOR("Intel Corporation");
 512 MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
 513 MODULE_LICENSE("GPL v2");