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         /* 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");