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
  17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  18
  19 #include <linux/module.h>
  20 #include <linux/moduleparam.h>
  21 #include <linux/kernel.h>
  22 #include <linux/device.h>
  23 #include <linux/fs.h>
  24 #include <linux/errno.h>
  25 #include <linux/types.h>
  26 #include <linux/fcntl.h>
  27 #include <linux/aio.h>
  28 #include <linux/pci.h>
  29 #include <linux/poll.h>
  30 #include <linux/init.h>
  31 #include <linux/ioctl.h>
  32 #include <linux/cdev.h>
  33 #include <linux/sched.h>
  34 #include <linux/uuid.h>
  35 #include <linux/compat.h>
  36 #include <linux/jiffies.h>
  37 #include <linux/interrupt.h>
  38 #include <linux/miscdevice.h>
  39
  40 #include <linux/mei.h>
  41
  42 #include "mei_dev.h"
  43 #include "hw-me.h"
  44 #include "client.h"
  45
  46 /* AMT device is a singleton on the platform */
  47 static struct pci_dev *mei_pdev;
  48
  49 /* mei_pci_tbl - PCI Device ID Table */
  50 static DEFINE_PCI_DEVICE_TABLE(mei_pci_tbl) = {
  51         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82946GZ)},
  52         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G35)},
  53         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82Q965)},
  54         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G965)},
  55         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GM965)},
  56         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GME965)},
  57         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q35)},
  58         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82G33)},
  59         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q33)},
  60         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82X38)},
  61         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_3200)},
  62         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_6)},
  63         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_7)},
  64         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_8)},
  65         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_9)},
  66         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_10)},
  67         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_1)},
  68         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_2)},
  69         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_3)},
  70         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_4)},
  71         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_1)},
  72         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_2)},
  73         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_3)},
  74         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_4)},
  75         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_1)},
  76         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_2)},
  77         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_CPT_1)},
  78         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PBG_1)},
  79         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_1)},
  80         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_2)},
  81         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_3)},
  82         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT)},
  83         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT_LP)},
  84
  85         /* required last entry */
  86         {0, }
  87 };
  88
  89 MODULE_DEVICE_TABLE(pci, mei_pci_tbl);
  90
  91 static DEFINE_MUTEX(mei_mutex);
  92
  93 /**
  94  * mei_quirk_probe - probe for devices that doesn't valid ME interface
  95  * @pdev: PCI device structure
  96  * @ent: entry into pci_device_table
  97  *
  98  * returns true if ME Interface is valid, false otherwise
  99  */
 100 static bool mei_quirk_probe(struct pci_dev *pdev,
 101                                 const struct pci_device_id *ent)
 102 {
 103         u32 reg;
 104         if (ent->device == MEI_DEV_ID_PBG_1) {
 105                 pci_read_config_dword(pdev, 0x48, &reg);
 106                 /* make sure that bit 9 is up and bit 10 is down */
 107                 if ((reg & 0x600) == 0x200) {
 108                         dev_info(&pdev->dev, "Device doesn't have valid ME Interface\n");
 109                         return false;
 110                 }
 111         }
 112         return true;
 113 }
 114 /**
 115  * mei_probe - Device Initialization Routine
 116  *
 117  * @pdev: PCI device structure
 118  * @ent: entry in kcs_pci_tbl
 119  *
 120  * returns 0 on success, <0 on failure.
 121  */
 122 static int mei_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 123 {
 124         struct mei_device *dev;
 125         struct mei_me_hw *hw;
 126         int err;
 127
 128         mutex_lock(&mei_mutex);
 129
 130         if (!mei_quirk_probe(pdev, ent)) {
 131                 err = -ENODEV;
 132                 goto end;
 133         }
 134
 135         if (mei_pdev) {
 136                 err = -EEXIST;
 137                 goto end;
 138         }
 139         /* enable pci dev */
 140         err = pci_enable_device(pdev);
 141         if (err) {
 142                 dev_err(&pdev->dev, "failed to enable pci device.\n");
 143                 goto end;
 144         }
 145         /* set PCI host mastering  */
 146         pci_set_master(pdev);
 147         /* pci request regions for mei driver */
 148         err = pci_request_regions(pdev, KBUILD_MODNAME);
 149         if (err) {
 150                 dev_err(&pdev->dev, "failed to get pci regions.\n");
 151                 goto disable_device;
 152         }
 153         /* allocates and initializes the mei dev structure */
 154         dev = mei_me_dev_init(pdev);
 155         if (!dev) {
 156                 err = -ENOMEM;
 157                 goto release_regions;
 158         }
 159         hw = to_me_hw(dev);
 160         /* mapping  IO device memory */
 161         hw->mem_addr = pci_iomap(pdev, 0, 0);
 162         if (!hw->mem_addr) {
 163                 dev_err(&pdev->dev, "mapping I/O device memory failure.\n");
 164                 err = -ENOMEM;
 165                 goto free_device;
 166         }
 167         pci_enable_msi(pdev);
 168
 169          /* request and enable interrupt */
 170         if (pci_dev_msi_enabled(pdev))
 171                 err = request_threaded_irq(pdev->irq,
 172                         NULL,
 173                         mei_me_irq_thread_handler,
 174                         IRQF_ONESHOT, KBUILD_MODNAME, dev);
 175         else
 176                 err = request_threaded_irq(pdev->irq,
 177                         mei_me_irq_quick_handler,
 178                         mei_me_irq_thread_handler,
 179                         IRQF_SHARED, KBUILD_MODNAME, dev);
 180
 181         if (err) {
 182                 dev_err(&pdev->dev, "request_threaded_irq failure. irq = %d\n",
 183                        pdev->irq);
 184                 goto disable_msi;
 185         }
 186
 187         if (mei_hw_init(dev)) {
 188                 dev_err(&pdev->dev, "init hw failure.\n");
 189                 err = -ENODEV;
 190                 goto release_irq;
 191         }
 192
 193         err = mei_register(&pdev->dev);
 194         if (err)
 195                 goto release_irq;
 196
 197         mei_pdev = pdev;
 198         pci_set_drvdata(pdev, dev);
 199
 200
 201         schedule_delayed_work(&dev->timer_work, HZ);
 202
 203         mutex_unlock(&mei_mutex);
 204
 205         pr_debug("initialization successful.\n");
 206
 207         return 0;
 208
 209 release_irq:
 210         mei_disable_interrupts(dev);
 211         flush_scheduled_work();
 212         free_irq(pdev->irq, dev);
 213 disable_msi:
 214         pci_disable_msi(pdev);
 215         pci_iounmap(pdev, hw->mem_addr);
 216 free_device:
 217         kfree(dev);
 218 release_regions:
 219         pci_release_regions(pdev);
 220 disable_device:
 221         pci_disable_device(pdev);
 222 end:
 223         mutex_unlock(&mei_mutex);
 224         dev_err(&pdev->dev, "initialization failed.\n");
 225         return err;
 226 }
 227
 228 /**
 229  * mei_remove - Device Removal Routine
 230  *
 231  * @pdev: PCI device structure
 232  *
 233  * mei_remove is called by the PCI subsystem to alert the driver
 234  * that it should release a PCI device.
 235  */
 236 static void mei_remove(struct pci_dev *pdev)
 237 {
 238         struct mei_device *dev;
 239         struct mei_me_hw *hw;
 240
 241         if (mei_pdev != pdev)
 242                 return;
 243
 244         dev = pci_get_drvdata(pdev);
 245         if (!dev)
 246                 return;
 247
 248         hw = to_me_hw(dev);
 249
 250         mutex_lock(&dev->device_lock);
 251
 252         cancel_delayed_work(&dev->timer_work);
 253
 254         mei_wd_stop(dev);
 255
 256         mei_pdev = NULL;
 257
 258         if (dev->iamthif_cl.state == MEI_FILE_CONNECTED) {
 259                 dev->iamthif_cl.state = MEI_FILE_DISCONNECTING;
 260                 mei_cl_disconnect(&dev->iamthif_cl);
 261         }
 262         if (dev->wd_cl.state == MEI_FILE_CONNECTED) {
 263                 dev->wd_cl.state = MEI_FILE_DISCONNECTING;
 264                 mei_cl_disconnect(&dev->wd_cl);
 265         }
 266
 267         /* Unregistering watchdog device */
 268         mei_watchdog_unregister(dev);
 269
 270         /* remove entry if already in list */
 271         dev_dbg(&pdev->dev, "list del iamthif and wd file list.\n");
 272
 273         if (dev->open_handle_count > 0)
 274                 dev->open_handle_count--;
 275         mei_cl_unlink(&dev->wd_cl);
 276
 277         if (dev->open_handle_count > 0)
 278                 dev->open_handle_count--;
 279         mei_cl_unlink(&dev->iamthif_cl);
 280
 281         dev->iamthif_current_cb = NULL;
 282         dev->me_clients_num = 0;
 283
 284         mutex_unlock(&dev->device_lock);
 285
 286         flush_scheduled_work();
 287
 288         /* disable interrupts */
 289         mei_disable_interrupts(dev);
 290
 291         free_irq(pdev->irq, dev);
 292         pci_disable_msi(pdev);
 293         pci_set_drvdata(pdev, NULL);
 294
 295         if (hw->mem_addr)
 296                 pci_iounmap(pdev, hw->mem_addr);
 297
 298         kfree(dev);
 299
 300         pci_release_regions(pdev);
 301         pci_disable_device(pdev);
 302
 303         mei_deregister();
 304
 305 }
 306 #ifdef CONFIG_PM
 307 static int mei_pci_suspend(struct device *device)
 308 {
 309         struct pci_dev *pdev = to_pci_dev(device);
 310         struct mei_device *dev = pci_get_drvdata(pdev);
 311         int err;
 312
 313         if (!dev)
 314                 return -ENODEV;
 315         mutex_lock(&dev->device_lock);
 316
 317         cancel_delayed_work(&dev->timer_work);
 318
 319         /* Stop watchdog if exists */
 320         err = mei_wd_stop(dev);
 321         /* Set new mei state */
 322         if (dev->dev_state == MEI_DEV_ENABLED ||
 323             dev->dev_state == MEI_DEV_RECOVERING_FROM_RESET) {
 324                 dev->dev_state = MEI_DEV_POWER_DOWN;
 325                 mei_reset(dev, 0);
 326         }
 327         mutex_unlock(&dev->device_lock);
 328
 329         free_irq(pdev->irq, dev);
 330         pci_disable_msi(pdev);
 331
 332         return err;
 333 }
 334
 335 static int mei_pci_resume(struct device *device)
 336 {
 337         struct pci_dev *pdev = to_pci_dev(device);
 338         struct mei_device *dev;
 339         int err;
 340
 341         dev = pci_get_drvdata(pdev);
 342         if (!dev)
 343                 return -ENODEV;
 344
 345         pci_enable_msi(pdev);
 346
 347         /* request and enable interrupt */
 348         if (pci_dev_msi_enabled(pdev))
 349                 err = request_threaded_irq(pdev->irq,
 350                         NULL,
 351                         mei_me_irq_thread_handler,
 352                         IRQF_ONESHOT, KBUILD_MODNAME, dev);
 353         else
 354                 err = request_threaded_irq(pdev->irq,
 355                         mei_me_irq_quick_handler,
 356                         mei_me_irq_thread_handler,
 357                         IRQF_SHARED, KBUILD_MODNAME, dev);
 358
 359         if (err) {
 360                 dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
 361                                 pdev->irq);
 362                 return err;
 363         }
 364
 365         mutex_lock(&dev->device_lock);
 366         dev->dev_state = MEI_DEV_POWER_UP;
 367         mei_reset(dev, 1);
 368         mutex_unlock(&dev->device_lock);
 369
 370         /* Start timer if stopped in suspend */
 371         schedule_delayed_work(&dev->timer_work, HZ);
 372
 373         return err;
 374 }
 375 static SIMPLE_DEV_PM_OPS(mei_pm_ops, mei_pci_suspend, mei_pci_resume);
 376 #define MEI_PM_OPS      (&mei_pm_ops)
 377 #else
 378 #define MEI_PM_OPS      NULL
 379 #endif /* CONFIG_PM */
 380 /*
 381  *  PCI driver structure
 382  */
 383 static struct pci_driver mei_driver = {
 384         .name = KBUILD_MODNAME,
 385         .id_table = mei_pci_tbl,
 386         .probe = mei_probe,
 387         .remove = mei_remove,
 388         .shutdown = mei_remove,
 389         .driver.pm = MEI_PM_OPS,
 390 };
 391
 392 module_pci_driver(mei_driver);
 393
 394 MODULE_AUTHOR("Intel Corporation");
 395 MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
 396 MODULE_LICENSE("GPL v2");