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_me_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_me_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  *
  96  * @pdev: PCI device structure
  97  * @ent: entry into pci_device_table
  98  *
  99  * returns true if ME Interface is valid, false otherwise
 100  */
 101 static bool mei_me_quirk_probe(struct pci_dev *pdev,
 102                                 const struct pci_device_id *ent)
 103 {
 104         u32 reg;
 105         if (ent->device == MEI_DEV_ID_PBG_1) {
 106                 pci_read_config_dword(pdev, 0x48, &reg);
 107                 /* make sure that bit 9 is up and bit 10 is down */
 108                 if ((reg & 0x600) == 0x200) {
 109                         dev_info(&pdev->dev, "Device doesn't have valid ME Interface\n");
 110                         return false;
 111                 }
 112         }
 113         return true;
 114 }
 115 /**
 116  * mei_probe - Device Initialization Routine
 117  *
 118  * @pdev: PCI device structure
 119  * @ent: entry in kcs_pci_tbl
 120  *
 121  * returns 0 on success, <0 on failure.
 122  */
 123 static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 124 {
 125         struct mei_device *dev;
 126         struct mei_me_hw *hw;
 127         int err;
 128
 129         mutex_lock(&mei_mutex);
 130
 131         if (!mei_me_quirk_probe(pdev, ent)) {
 132                 err = -ENODEV;
 133                 goto end;
 134         }
 135
 136         if (mei_pdev) {
 137                 err = -EEXIST;
 138                 goto end;
 139         }
 140         /* enable pci dev */
 141         err = pci_enable_device(pdev);
 142         if (err) {
 143                 dev_err(&pdev->dev, "failed to enable pci device.\n");
 144                 goto end;
 145         }
 146         /* set PCI host mastering  */
 147         pci_set_master(pdev);
 148         /* pci request regions for mei driver */
 149         err = pci_request_regions(pdev, KBUILD_MODNAME);
 150         if (err) {
 151                 dev_err(&pdev->dev, "failed to get pci regions.\n");
 152                 goto disable_device;
 153         }
 154         /* allocates and initializes the mei dev structure */
 155         dev = mei_me_dev_init(pdev);
 156         if (!dev) {
 157                 err = -ENOMEM;
 158                 goto release_regions;
 159         }
 160         hw = to_me_hw(dev);
 161         /* mapping  IO device memory */
 162         hw->mem_addr = pci_iomap(pdev, 0, 0);
 163         if (!hw->mem_addr) {
 164                 dev_err(&pdev->dev, "mapping I/O device memory failure.\n");
 165                 err = -ENOMEM;
 166                 goto free_device;
 167         }
 168         pci_enable_msi(pdev);
 169
 170          /* request and enable interrupt */
 171         if (pci_dev_msi_enabled(pdev))
 172                 err = request_threaded_irq(pdev->irq,
 173                         NULL,
 174                         mei_me_irq_thread_handler,
 175                         IRQF_ONESHOT, KBUILD_MODNAME, dev);
 176         else
 177                 err = request_threaded_irq(pdev->irq,
 178                         mei_me_irq_quick_handler,
 179                         mei_me_irq_thread_handler,
 180                         IRQF_SHARED, KBUILD_MODNAME, dev);
 181
 182         if (err) {
 183                 dev_err(&pdev->dev, "request_threaded_irq failure. irq = %d\n",
 184                        pdev->irq);
 185                 goto disable_msi;
 186         }
 187
 188         if (mei_start(dev)) {
 189                 dev_err(&pdev->dev, "init hw failure.\n");
 190                 err = -ENODEV;
 191                 goto release_irq;
 192         }
 193
 194         err = mei_register(dev);
 195         if (err)
 196                 goto release_irq;
 197
 198         mei_pdev = pdev;
 199         pci_set_drvdata(pdev, dev);
 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_me_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
 251         dev_err(&pdev->dev, "stop\n");
 252         mei_stop(dev);
 253
 254         mei_pdev = NULL;
 255
 256         /* disable interrupts */
 257         mei_disable_interrupts(dev);
 258
 259         free_irq(pdev->irq, dev);
 260         pci_disable_msi(pdev);
 261         pci_set_drvdata(pdev, NULL);
 262
 263         if (hw->mem_addr)
 264                 pci_iounmap(pdev, hw->mem_addr);
 265
 266         mei_deregister(dev);
 267
 268         kfree(dev);
 269
 270         pci_release_regions(pdev);
 271         pci_disable_device(pdev);
 272
 273
 274 }
 275 #ifdef CONFIG_PM
 276 static int mei_me_pci_suspend(struct device *device)
 277 {
 278         struct pci_dev *pdev = to_pci_dev(device);
 279         struct mei_device *dev = pci_get_drvdata(pdev);
 280
 281         if (!dev)
 282                 return -ENODEV;
 283
 284         dev_err(&pdev->dev, "suspend\n");
 285
 286         mei_stop(dev);
 287
 288         mei_disable_interrupts(dev);
 289
 290         free_irq(pdev->irq, dev);
 291         pci_disable_msi(pdev);
 292
 293         return 0;
 294 }
 295
 296 static int mei_me_pci_resume(struct device *device)
 297 {
 298         struct pci_dev *pdev = to_pci_dev(device);
 299         struct mei_device *dev;
 300         int err;
 301
 302         dev = pci_get_drvdata(pdev);
 303         if (!dev)
 304                 return -ENODEV;
 305
 306         pci_enable_msi(pdev);
 307
 308         /* request and enable interrupt */
 309         if (pci_dev_msi_enabled(pdev))
 310                 err = request_threaded_irq(pdev->irq,
 311                         NULL,
 312                         mei_me_irq_thread_handler,
 313                         IRQF_ONESHOT, KBUILD_MODNAME, dev);
 314         else
 315                 err = request_threaded_irq(pdev->irq,
 316                         mei_me_irq_quick_handler,
 317                         mei_me_irq_thread_handler,
 318                         IRQF_SHARED, KBUILD_MODNAME, dev);
 319
 320         if (err) {
 321                 dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
 322                                 pdev->irq);
 323                 return err;
 324         }
 325
 326         mutex_lock(&dev->device_lock);
 327         dev->dev_state = MEI_DEV_POWER_UP;
 328         mei_clear_interrupts(dev);
 329         mei_reset(dev, 1);
 330         mutex_unlock(&dev->device_lock);
 331
 332         /* Start timer if stopped in suspend */
 333         schedule_delayed_work(&dev->timer_work, HZ);
 334
 335         return err;
 336 }
 337 static SIMPLE_DEV_PM_OPS(mei_me_pm_ops, mei_me_pci_suspend, mei_me_pci_resume);
 338 #define MEI_ME_PM_OPS   (&mei_me_pm_ops)
 339 #else
 340 #define MEI_ME_PM_OPS   NULL
 341 #endif /* CONFIG_PM */
 342 /*
 343  *  PCI driver structure
 344  */
 345 static struct pci_driver mei_me_driver = {
 346         .name = KBUILD_MODNAME,
 347         .id_table = mei_me_pci_tbl,
 348         .probe = mei_me_probe,
 349         .remove = mei_me_remove,
 350         .shutdown = mei_me_remove,
 351         .driver.pm = MEI_ME_PM_OPS,
 352 };
 353
 354 module_pci_driver(mei_me_driver);
 355
 356 MODULE_AUTHOR("Intel Corporation");
 357 MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
 358 MODULE_LICENSE("GPL v2");