linux/drivers/misc/mei/pci-me.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (c) 2003-2020, Intel Corporation. All rights reserved.
   4 * Intel Management Engine Interface (Intel MEI) Linux driver
   5 */
   6
   7#include <linux/module.h>
   8#include <linux/kernel.h>
   9#include <linux/device.h>
  10#include <linux/errno.h>
  11#include <linux/types.h>
  12#include <linux/pci.h>
  13#include <linux/sched.h>
  14#include <linux/interrupt.h>
  15
  16#include <linux/pm_domain.h>
  17#include <linux/pm_runtime.h>
  18
  19#include <linux/mei.h>
  20
  21#include "mei_dev.h"
  22#include "client.h"
  23#include "hw-me-regs.h"
  24#include "hw-me.h"
  25
  26/* mei_pci_tbl - PCI Device ID Table */
  27static const struct pci_device_id mei_me_pci_tbl[] = {
  28        {MEI_PCI_DEVICE(MEI_DEV_ID_82946GZ, MEI_ME_ICH_CFG)},
  29        {MEI_PCI_DEVICE(MEI_DEV_ID_82G35, MEI_ME_ICH_CFG)},
  30        {MEI_PCI_DEVICE(MEI_DEV_ID_82Q965, MEI_ME_ICH_CFG)},
  31        {MEI_PCI_DEVICE(MEI_DEV_ID_82G965, MEI_ME_ICH_CFG)},
  32        {MEI_PCI_DEVICE(MEI_DEV_ID_82GM965, MEI_ME_ICH_CFG)},
  33        {MEI_PCI_DEVICE(MEI_DEV_ID_82GME965, MEI_ME_ICH_CFG)},
  34        {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82Q35, MEI_ME_ICH_CFG)},
  35        {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82G33, MEI_ME_ICH_CFG)},
  36        {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82Q33, MEI_ME_ICH_CFG)},
  37        {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82X38, MEI_ME_ICH_CFG)},
  38        {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_3200, MEI_ME_ICH_CFG)},
  39
  40        {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_6, MEI_ME_ICH_CFG)},
  41        {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_7, MEI_ME_ICH_CFG)},
  42        {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_8, MEI_ME_ICH_CFG)},
  43        {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_9, MEI_ME_ICH_CFG)},
  44        {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_10, MEI_ME_ICH_CFG)},
  45        {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_1, MEI_ME_ICH_CFG)},
  46        {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_2, MEI_ME_ICH_CFG)},
  47        {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_3, MEI_ME_ICH_CFG)},
  48        {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_4, MEI_ME_ICH_CFG)},
  49
  50        {MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_1, MEI_ME_ICH10_CFG)},
  51        {MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_2, MEI_ME_ICH10_CFG)},
  52        {MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_3, MEI_ME_ICH10_CFG)},
  53        {MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_4, MEI_ME_ICH10_CFG)},
  54
  55        {MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_1, MEI_ME_PCH6_CFG)},
  56        {MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_2, MEI_ME_PCH6_CFG)},
  57        {MEI_PCI_DEVICE(MEI_DEV_ID_CPT_1, MEI_ME_PCH_CPT_PBG_CFG)},
  58        {MEI_PCI_DEVICE(MEI_DEV_ID_PBG_1, MEI_ME_PCH_CPT_PBG_CFG)},
  59        {MEI_PCI_DEVICE(MEI_DEV_ID_PPT_1, MEI_ME_PCH7_CFG)},
  60        {MEI_PCI_DEVICE(MEI_DEV_ID_PPT_2, MEI_ME_PCH7_CFG)},
  61        {MEI_PCI_DEVICE(MEI_DEV_ID_PPT_3, MEI_ME_PCH7_CFG)},
  62        {MEI_PCI_DEVICE(MEI_DEV_ID_LPT_H, MEI_ME_PCH8_SPS_4_CFG)},
  63        {MEI_PCI_DEVICE(MEI_DEV_ID_LPT_W, MEI_ME_PCH8_SPS_4_CFG)},
  64        {MEI_PCI_DEVICE(MEI_DEV_ID_LPT_LP, MEI_ME_PCH8_CFG)},
  65        {MEI_PCI_DEVICE(MEI_DEV_ID_LPT_HR, MEI_ME_PCH8_SPS_4_CFG)},
  66        {MEI_PCI_DEVICE(MEI_DEV_ID_WPT_LP, MEI_ME_PCH8_CFG)},
  67        {MEI_PCI_DEVICE(MEI_DEV_ID_WPT_LP_2, MEI_ME_PCH8_CFG)},
  68
  69        {MEI_PCI_DEVICE(MEI_DEV_ID_SPT, MEI_ME_PCH8_CFG)},
  70        {MEI_PCI_DEVICE(MEI_DEV_ID_SPT_2, MEI_ME_PCH8_CFG)},
  71        {MEI_PCI_DEVICE(MEI_DEV_ID_SPT_3, MEI_ME_PCH8_ITOUCH_CFG)},
  72        {MEI_PCI_DEVICE(MEI_DEV_ID_SPT_H, MEI_ME_PCH8_SPS_4_CFG)},
  73        {MEI_PCI_DEVICE(MEI_DEV_ID_SPT_H_2, MEI_ME_PCH8_SPS_4_CFG)},
  74        {MEI_PCI_DEVICE(MEI_DEV_ID_LBG, MEI_ME_PCH12_SPS_4_CFG)},
  75
  76        {MEI_PCI_DEVICE(MEI_DEV_ID_BXT_M, MEI_ME_PCH8_CFG)},
  77        {MEI_PCI_DEVICE(MEI_DEV_ID_APL_I, MEI_ME_PCH8_CFG)},
  78
  79        {MEI_PCI_DEVICE(MEI_DEV_ID_DNV_IE, MEI_ME_PCH8_CFG)},
  80
  81        {MEI_PCI_DEVICE(MEI_DEV_ID_GLK, MEI_ME_PCH8_CFG)},
  82
  83        {MEI_PCI_DEVICE(MEI_DEV_ID_KBP, MEI_ME_PCH8_CFG)},
  84        {MEI_PCI_DEVICE(MEI_DEV_ID_KBP_2, MEI_ME_PCH8_CFG)},
  85        {MEI_PCI_DEVICE(MEI_DEV_ID_KBP_3, MEI_ME_PCH8_CFG)},
  86
  87        {MEI_PCI_DEVICE(MEI_DEV_ID_CNP_LP, MEI_ME_PCH12_CFG)},
  88        {MEI_PCI_DEVICE(MEI_DEV_ID_CNP_LP_3, MEI_ME_PCH8_ITOUCH_CFG)},
  89        {MEI_PCI_DEVICE(MEI_DEV_ID_CNP_H, MEI_ME_PCH12_SPS_CFG)},
  90        {MEI_PCI_DEVICE(MEI_DEV_ID_CNP_H_3, MEI_ME_PCH12_SPS_ITOUCH_CFG)},
  91
  92        {MEI_PCI_DEVICE(MEI_DEV_ID_CMP_LP, MEI_ME_PCH12_CFG)},
  93        {MEI_PCI_DEVICE(MEI_DEV_ID_CMP_LP_3, MEI_ME_PCH8_ITOUCH_CFG)},
  94        {MEI_PCI_DEVICE(MEI_DEV_ID_CMP_V, MEI_ME_PCH12_CFG)},
  95        {MEI_PCI_DEVICE(MEI_DEV_ID_CMP_H, MEI_ME_PCH12_CFG)},
  96        {MEI_PCI_DEVICE(MEI_DEV_ID_CMP_H_3, MEI_ME_PCH8_ITOUCH_CFG)},
  97
  98        {MEI_PCI_DEVICE(MEI_DEV_ID_ICP_LP, MEI_ME_PCH12_CFG)},
  99
 100        {MEI_PCI_DEVICE(MEI_DEV_ID_TGP_LP, MEI_ME_PCH15_CFG)},
 101        {MEI_PCI_DEVICE(MEI_DEV_ID_TGP_H, MEI_ME_PCH15_SPS_CFG)},
 102
 103        {MEI_PCI_DEVICE(MEI_DEV_ID_JSP_N, MEI_ME_PCH15_CFG)},
 104
 105        {MEI_PCI_DEVICE(MEI_DEV_ID_MCC, MEI_ME_PCH15_CFG)},
 106        {MEI_PCI_DEVICE(MEI_DEV_ID_MCC_4, MEI_ME_PCH8_CFG)},
 107
 108        {MEI_PCI_DEVICE(MEI_DEV_ID_CDF, MEI_ME_PCH8_CFG)},
 109
 110        {MEI_PCI_DEVICE(MEI_DEV_ID_EBG, MEI_ME_PCH15_SPS_CFG)},
 111
 112        {MEI_PCI_DEVICE(MEI_DEV_ID_ADP_S, MEI_ME_PCH15_CFG)},
 113        {MEI_PCI_DEVICE(MEI_DEV_ID_ADP_LP, MEI_ME_PCH15_CFG)},
 114        {MEI_PCI_DEVICE(MEI_DEV_ID_ADP_P, MEI_ME_PCH15_CFG)},
 115
 116        /* required last entry */
 117        {0, }
 118};
 119
 120MODULE_DEVICE_TABLE(pci, mei_me_pci_tbl);
 121
 122#ifdef CONFIG_PM
 123static inline void mei_me_set_pm_domain(struct mei_device *dev);
 124static inline void mei_me_unset_pm_domain(struct mei_device *dev);
 125#else
 126static inline void mei_me_set_pm_domain(struct mei_device *dev) {}
 127static inline void mei_me_unset_pm_domain(struct mei_device *dev) {}
 128#endif /* CONFIG_PM */
 129
 130static int mei_me_read_fws(const struct mei_device *dev, int where, u32 *val)
 131{
 132        struct pci_dev *pdev = to_pci_dev(dev->dev);
 133
 134        return pci_read_config_dword(pdev, where, val);
 135}
 136
 137/**
 138 * mei_me_quirk_probe - probe for devices that doesn't valid ME interface
 139 *
 140 * @pdev: PCI device structure
 141 * @cfg: per generation config
 142 *
 143 * Return: true if ME Interface is valid, false otherwise
 144 */
 145static bool mei_me_quirk_probe(struct pci_dev *pdev,
 146                                const struct mei_cfg *cfg)
 147{
 148        if (cfg->quirk_probe && cfg->quirk_probe(pdev)) {
 149                dev_info(&pdev->dev, "Device doesn't have valid ME Interface\n");
 150                return false;
 151        }
 152
 153        return true;
 154}
 155
 156/**
 157 * mei_me_probe - Device Initialization Routine
 158 *
 159 * @pdev: PCI device structure
 160 * @ent: entry in kcs_pci_tbl
 161 *
 162 * Return: 0 on success, <0 on failure.
 163 */
 164static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 165{
 166        const struct mei_cfg *cfg;
 167        struct mei_device *dev;
 168        struct mei_me_hw *hw;
 169        unsigned int irqflags;
 170        int err;
 171
 172        cfg = mei_me_get_cfg(ent->driver_data);
 173        if (!cfg)
 174                return -ENODEV;
 175
 176        if (!mei_me_quirk_probe(pdev, cfg))
 177                return -ENODEV;
 178
 179        /* enable pci dev */
 180        err = pcim_enable_device(pdev);
 181        if (err) {
 182                dev_err(&pdev->dev, "failed to enable pci device.\n");
 183                goto end;
 184        }
 185        /* set PCI host mastering  */
 186        pci_set_master(pdev);
 187        /* pci request regions and mapping IO device memory for mei driver */
 188        err = pcim_iomap_regions(pdev, BIT(0), KBUILD_MODNAME);
 189        if (err) {
 190                dev_err(&pdev->dev, "failed to get pci regions.\n");
 191                goto end;
 192        }
 193
 194        if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)) ||
 195            dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64))) {
 196
 197                err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
 198                if (err)
 199                        err = dma_set_coherent_mask(&pdev->dev,
 200                                                    DMA_BIT_MASK(32));
 201        }
 202        if (err) {
 203                dev_err(&pdev->dev, "No usable DMA configuration, aborting\n");
 204                goto end;
 205        }
 206
 207        /* allocates and initializes the mei dev structure */
 208        dev = mei_me_dev_init(&pdev->dev, cfg);
 209        if (!dev) {
 210                err = -ENOMEM;
 211                goto end;
 212        }
 213        hw = to_me_hw(dev);
 214        hw->mem_addr = pcim_iomap_table(pdev)[0];
 215        hw->read_fws = mei_me_read_fws;
 216
 217        pci_enable_msi(pdev);
 218
 219        hw->irq = pdev->irq;
 220
 221         /* request and enable interrupt */
 222        irqflags = pci_dev_msi_enabled(pdev) ? IRQF_ONESHOT : IRQF_SHARED;
 223
 224        err = request_threaded_irq(pdev->irq,
 225                        mei_me_irq_quick_handler,
 226                        mei_me_irq_thread_handler,
 227                        irqflags, KBUILD_MODNAME, dev);
 228        if (err) {
 229                dev_err(&pdev->dev, "request_threaded_irq failure. irq = %d\n",
 230                       pdev->irq);
 231                goto end;
 232        }
 233
 234        if (mei_start(dev)) {
 235                dev_err(&pdev->dev, "init hw failure.\n");
 236                err = -ENODEV;
 237                goto release_irq;
 238        }
 239
 240        pm_runtime_set_autosuspend_delay(&pdev->dev, MEI_ME_RPM_TIMEOUT);
 241        pm_runtime_use_autosuspend(&pdev->dev);
 242
 243        err = mei_register(dev, &pdev->dev);
 244        if (err)
 245                goto stop;
 246
 247        pci_set_drvdata(pdev, dev);
 248
 249        /*
 250         * MEI requires to resume from runtime suspend mode
 251         * in order to perform link reset flow upon system suspend.
 252         */
 253        dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_NO_DIRECT_COMPLETE);
 254
 255        /*
 256         * ME maps runtime suspend/resume to D0i states,
 257         * hence we need to go around native PCI runtime service which
 258         * eventually brings the device into D3cold/hot state,
 259         * but the mei device cannot wake up from D3 unlike from D0i3.
 260         * To get around the PCI device native runtime pm,
 261         * ME uses runtime pm domain handlers which take precedence
 262         * over the driver's pm handlers.
 263         */
 264        mei_me_set_pm_domain(dev);
 265
 266        if (mei_pg_is_enabled(dev)) {
 267                pm_runtime_put_noidle(&pdev->dev);
 268                if (hw->d0i3_supported)
 269                        pm_runtime_allow(&pdev->dev);
 270        }
 271
 272        dev_dbg(&pdev->dev, "initialization successful.\n");
 273
 274        return 0;
 275
 276stop:
 277        mei_stop(dev);
 278release_irq:
 279        mei_cancel_work(dev);
 280        mei_disable_interrupts(dev);
 281        free_irq(pdev->irq, dev);
 282end:
 283        dev_err(&pdev->dev, "initialization failed.\n");
 284        return err;
 285}
 286
 287/**
 288 * mei_me_shutdown - Device Removal Routine
 289 *
 290 * @pdev: PCI device structure
 291 *
 292 * mei_me_shutdown is called from the reboot notifier
 293 * it's a simplified version of remove so we go down
 294 * faster.
 295 */
 296static void mei_me_shutdown(struct pci_dev *pdev)
 297{
 298        struct mei_device *dev;
 299
 300        dev = pci_get_drvdata(pdev);
 301        if (!dev)
 302                return;
 303
 304        dev_dbg(&pdev->dev, "shutdown\n");
 305        mei_stop(dev);
 306
 307        mei_me_unset_pm_domain(dev);
 308
 309        mei_disable_interrupts(dev);
 310        free_irq(pdev->irq, dev);
 311}
 312
 313/**
 314 * mei_me_remove - Device Removal Routine
 315 *
 316 * @pdev: PCI device structure
 317 *
 318 * mei_me_remove is called by the PCI subsystem to alert the driver
 319 * that it should release a PCI device.
 320 */
 321static void mei_me_remove(struct pci_dev *pdev)
 322{
 323        struct mei_device *dev;
 324
 325        dev = pci_get_drvdata(pdev);
 326        if (!dev)
 327                return;
 328
 329        if (mei_pg_is_enabled(dev))
 330                pm_runtime_get_noresume(&pdev->dev);
 331
 332        dev_dbg(&pdev->dev, "stop\n");
 333        mei_stop(dev);
 334
 335        mei_me_unset_pm_domain(dev);
 336
 337        mei_disable_interrupts(dev);
 338
 339        free_irq(pdev->irq, dev);
 340
 341        mei_deregister(dev);
 342}
 343
 344#ifdef CONFIG_PM_SLEEP
 345static int mei_me_pci_suspend(struct device *device)
 346{
 347        struct pci_dev *pdev = to_pci_dev(device);
 348        struct mei_device *dev = pci_get_drvdata(pdev);
 349
 350        if (!dev)
 351                return -ENODEV;
 352
 353        dev_dbg(&pdev->dev, "suspend\n");
 354
 355        mei_stop(dev);
 356
 357        mei_disable_interrupts(dev);
 358
 359        free_irq(pdev->irq, dev);
 360        pci_disable_msi(pdev);
 361
 362        return 0;
 363}
 364
 365static int mei_me_pci_resume(struct device *device)
 366{
 367        struct pci_dev *pdev = to_pci_dev(device);
 368        struct mei_device *dev;
 369        unsigned int irqflags;
 370        int err;
 371
 372        dev = pci_get_drvdata(pdev);
 373        if (!dev)
 374                return -ENODEV;
 375
 376        pci_enable_msi(pdev);
 377
 378        irqflags = pci_dev_msi_enabled(pdev) ? IRQF_ONESHOT : IRQF_SHARED;
 379
 380        /* request and enable interrupt */
 381        err = request_threaded_irq(pdev->irq,
 382                        mei_me_irq_quick_handler,
 383                        mei_me_irq_thread_handler,
 384                        irqflags, KBUILD_MODNAME, dev);
 385
 386        if (err) {
 387                dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
 388                                pdev->irq);
 389                return err;
 390        }
 391
 392        err = mei_restart(dev);
 393        if (err)
 394                return err;
 395
 396        /* Start timer if stopped in suspend */
 397        schedule_delayed_work(&dev->timer_work, HZ);
 398
 399        return 0;
 400}
 401#endif /* CONFIG_PM_SLEEP */
 402
 403#ifdef CONFIG_PM
 404static int mei_me_pm_runtime_idle(struct device *device)
 405{
 406        struct mei_device *dev;
 407
 408        dev_dbg(device, "rpm: me: runtime_idle\n");
 409
 410        dev = dev_get_drvdata(device);
 411        if (!dev)
 412                return -ENODEV;
 413        if (mei_write_is_idle(dev))
 414                pm_runtime_autosuspend(device);
 415
 416        return -EBUSY;
 417}
 418
 419static int mei_me_pm_runtime_suspend(struct device *device)
 420{
 421        struct mei_device *dev;
 422        int ret;
 423
 424        dev_dbg(device, "rpm: me: runtime suspend\n");
 425
 426        dev = dev_get_drvdata(device);
 427        if (!dev)
 428                return -ENODEV;
 429
 430        mutex_lock(&dev->device_lock);
 431
 432        if (mei_write_is_idle(dev))
 433                ret = mei_me_pg_enter_sync(dev);
 434        else
 435                ret = -EAGAIN;
 436
 437        mutex_unlock(&dev->device_lock);
 438
 439        dev_dbg(device, "rpm: me: runtime suspend ret=%d\n", ret);
 440
 441        if (ret && ret != -EAGAIN)
 442                schedule_work(&dev->reset_work);
 443
 444        return ret;
 445}
 446
 447static int mei_me_pm_runtime_resume(struct device *device)
 448{
 449        struct mei_device *dev;
 450        int ret;
 451
 452        dev_dbg(device, "rpm: me: runtime resume\n");
 453
 454        dev = dev_get_drvdata(device);
 455        if (!dev)
 456                return -ENODEV;
 457
 458        mutex_lock(&dev->device_lock);
 459
 460        ret = mei_me_pg_exit_sync(dev);
 461
 462        mutex_unlock(&dev->device_lock);
 463
 464        dev_dbg(device, "rpm: me: runtime resume ret = %d\n", ret);
 465
 466        if (ret)
 467                schedule_work(&dev->reset_work);
 468
 469        return ret;
 470}
 471
 472/**
 473 * mei_me_set_pm_domain - fill and set pm domain structure for device
 474 *
 475 * @dev: mei_device
 476 */
 477static inline void mei_me_set_pm_domain(struct mei_device *dev)
 478{
 479        struct pci_dev *pdev  = to_pci_dev(dev->dev);
 480
 481        if (pdev->dev.bus && pdev->dev.bus->pm) {
 482                dev->pg_domain.ops = *pdev->dev.bus->pm;
 483
 484                dev->pg_domain.ops.runtime_suspend = mei_me_pm_runtime_suspend;
 485                dev->pg_domain.ops.runtime_resume = mei_me_pm_runtime_resume;
 486                dev->pg_domain.ops.runtime_idle = mei_me_pm_runtime_idle;
 487
 488                dev_pm_domain_set(&pdev->dev, &dev->pg_domain);
 489        }
 490}
 491
 492/**
 493 * mei_me_unset_pm_domain - clean pm domain structure for device
 494 *
 495 * @dev: mei_device
 496 */
 497static inline void mei_me_unset_pm_domain(struct mei_device *dev)
 498{
 499        /* stop using pm callbacks if any */
 500        dev_pm_domain_set(dev->dev, NULL);
 501}
 502
 503static const struct dev_pm_ops mei_me_pm_ops = {
 504        SET_SYSTEM_SLEEP_PM_OPS(mei_me_pci_suspend,
 505                                mei_me_pci_resume)
 506        SET_RUNTIME_PM_OPS(
 507                mei_me_pm_runtime_suspend,
 508                mei_me_pm_runtime_resume,
 509                mei_me_pm_runtime_idle)
 510};
 511
 512#define MEI_ME_PM_OPS   (&mei_me_pm_ops)
 513#else
 514#define MEI_ME_PM_OPS   NULL
 515#endif /* CONFIG_PM */
 516/*
 517 *  PCI driver structure
 518 */
 519static struct pci_driver mei_me_driver = {
 520        .name = KBUILD_MODNAME,
 521        .id_table = mei_me_pci_tbl,
 522        .probe = mei_me_probe,
 523        .remove = mei_me_remove,
 524        .shutdown = mei_me_shutdown,
 525        .driver.pm = MEI_ME_PM_OPS,
 526        .driver.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 527};
 528
 529module_pci_driver(mei_me_driver);
 530
 531MODULE_AUTHOR("Intel Corporation");
 532MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
 533MODULE_LICENSE("GPL v2");
 534