linux/drivers/pci/pcie/portdrv_pci.c
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   1/*
   2 * File:        portdrv_pci.c
   3 * Purpose:     PCI Express Port Bus Driver
   4 * Author:      Tom Nguyen <tom.l.nguyen@intel.com>
   5 * Version:     v1.0
   6 *
   7 * Copyright (C) 2004 Intel
   8 * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
   9 */
  10
  11#include <linux/pci.h>
  12#include <linux/kernel.h>
  13#include <linux/errno.h>
  14#include <linux/pm.h>
  15#include <linux/pm_runtime.h>
  16#include <linux/init.h>
  17#include <linux/pcieport_if.h>
  18#include <linux/aer.h>
  19#include <linux/dmi.h>
  20#include <linux/pci-aspm.h>
  21
  22#include "portdrv.h"
  23#include "aer/aerdrv.h"
  24
  25/* If this switch is set, PCIe port native services should not be enabled. */
  26bool pcie_ports_disabled;
  27
  28/*
  29 * If this switch is set, ACPI _OSC will be used to determine whether or not to
  30 * enable PCIe port native services.
  31 */
  32bool pcie_ports_auto = true;
  33
  34static int __init pcie_port_setup(char *str)
  35{
  36        if (!strncmp(str, "compat", 6)) {
  37                pcie_ports_disabled = true;
  38        } else if (!strncmp(str, "native", 6)) {
  39                pcie_ports_disabled = false;
  40                pcie_ports_auto = false;
  41        } else if (!strncmp(str, "auto", 4)) {
  42                pcie_ports_disabled = false;
  43                pcie_ports_auto = true;
  44        }
  45
  46        return 1;
  47}
  48__setup("pcie_ports=", pcie_port_setup);
  49
  50/* global data */
  51
  52/**
  53 * pcie_clear_root_pme_status - Clear root port PME interrupt status.
  54 * @dev: PCIe root port or event collector.
  55 */
  56void pcie_clear_root_pme_status(struct pci_dev *dev)
  57{
  58        pcie_capability_set_dword(dev, PCI_EXP_RTSTA, PCI_EXP_RTSTA_PME);
  59}
  60
  61static int pcie_portdrv_restore_config(struct pci_dev *dev)
  62{
  63        int retval;
  64
  65        retval = pci_enable_device(dev);
  66        if (retval)
  67                return retval;
  68        pci_set_master(dev);
  69        return 0;
  70}
  71
  72#ifdef CONFIG_PM
  73static int pcie_port_resume_noirq(struct device *dev)
  74{
  75        struct pci_dev *pdev = to_pci_dev(dev);
  76
  77        /*
  78         * Some BIOSes forget to clear Root PME Status bits after system wakeup
  79         * which breaks ACPI-based runtime wakeup on PCI Express, so clear those
  80         * bits now just in case (shouldn't hurt).
  81         */
  82        if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT)
  83                pcie_clear_root_pme_status(pdev);
  84        return 0;
  85}
  86
  87static int pcie_port_runtime_suspend(struct device *dev)
  88{
  89        return to_pci_dev(dev)->bridge_d3 ? 0 : -EBUSY;
  90}
  91
  92static int pcie_port_runtime_resume(struct device *dev)
  93{
  94        return 0;
  95}
  96
  97static int pcie_port_runtime_idle(struct device *dev)
  98{
  99        /*
 100         * Assume the PCI core has set bridge_d3 whenever it thinks the port
 101         * should be good to go to D3.  Everything else, including moving
 102         * the port to D3, is handled by the PCI core.
 103         */
 104        return to_pci_dev(dev)->bridge_d3 ? 0 : -EBUSY;
 105}
 106
 107static const struct dev_pm_ops pcie_portdrv_pm_ops = {
 108        .suspend        = pcie_port_device_suspend,
 109        .resume         = pcie_port_device_resume,
 110        .freeze         = pcie_port_device_suspend,
 111        .thaw           = pcie_port_device_resume,
 112        .poweroff       = pcie_port_device_suspend,
 113        .restore        = pcie_port_device_resume,
 114        .resume_noirq   = pcie_port_resume_noirq,
 115        .runtime_suspend = pcie_port_runtime_suspend,
 116        .runtime_resume = pcie_port_runtime_resume,
 117        .runtime_idle   = pcie_port_runtime_idle,
 118};
 119
 120#define PCIE_PORTDRV_PM_OPS     (&pcie_portdrv_pm_ops)
 121
 122#else /* !PM */
 123
 124#define PCIE_PORTDRV_PM_OPS     NULL
 125#endif /* !PM */
 126
 127/*
 128 * pcie_portdrv_probe - Probe PCI-Express port devices
 129 * @dev: PCI-Express port device being probed
 130 *
 131 * If detected invokes the pcie_port_device_register() method for
 132 * this port device.
 133 *
 134 */
 135static int pcie_portdrv_probe(struct pci_dev *dev,
 136                                        const struct pci_device_id *id)
 137{
 138        int status;
 139
 140        if (!pci_is_pcie(dev) ||
 141            ((pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) &&
 142             (pci_pcie_type(dev) != PCI_EXP_TYPE_UPSTREAM) &&
 143             (pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM)))
 144                return -ENODEV;
 145
 146        status = pcie_port_device_register(dev);
 147        if (status)
 148                return status;
 149
 150        pci_save_state(dev);
 151
 152        /*
 153         * Prevent runtime PM if the port is advertising support for PCIe
 154         * hotplug.  Otherwise the BIOS hotplug SMI code might not be able
 155         * to enumerate devices behind this port properly (the port is
 156         * powered down preventing all config space accesses to the
 157         * subordinate devices).  We can't be sure for native PCIe hotplug
 158         * either so prevent that as well.
 159         */
 160        if (!dev->is_hotplug_bridge) {
 161                /*
 162                 * Keep the port resumed 100ms to make sure things like
 163                 * config space accesses from userspace (lspci) will not
 164                 * cause the port to repeatedly suspend and resume.
 165                 */
 166                pm_runtime_set_autosuspend_delay(&dev->dev, 100);
 167                pm_runtime_use_autosuspend(&dev->dev);
 168                pm_runtime_mark_last_busy(&dev->dev);
 169                pm_runtime_put_autosuspend(&dev->dev);
 170                pm_runtime_allow(&dev->dev);
 171        }
 172
 173        return 0;
 174}
 175
 176static void pcie_portdrv_remove(struct pci_dev *dev)
 177{
 178        if (!dev->is_hotplug_bridge) {
 179                pm_runtime_forbid(&dev->dev);
 180                pm_runtime_get_noresume(&dev->dev);
 181                pm_runtime_dont_use_autosuspend(&dev->dev);
 182        }
 183
 184        pcie_port_device_remove(dev);
 185}
 186
 187static int error_detected_iter(struct device *device, void *data)
 188{
 189        struct pcie_device *pcie_device;
 190        struct pcie_port_service_driver *driver;
 191        struct aer_broadcast_data *result_data;
 192        pci_ers_result_t status;
 193
 194        result_data = (struct aer_broadcast_data *) data;
 195
 196        if (device->bus == &pcie_port_bus_type && device->driver) {
 197                driver = to_service_driver(device->driver);
 198                if (!driver ||
 199                        !driver->err_handler ||
 200                        !driver->err_handler->error_detected)
 201                        return 0;
 202
 203                pcie_device = to_pcie_device(device);
 204
 205                /* Forward error detected message to service drivers */
 206                status = driver->err_handler->error_detected(
 207                        pcie_device->port,
 208                        result_data->state);
 209                result_data->result =
 210                        merge_result(result_data->result, status);
 211        }
 212
 213        return 0;
 214}
 215
 216static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
 217                                        enum pci_channel_state error)
 218{
 219        struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER};
 220
 221        /* get true return value from &data */
 222        device_for_each_child(&dev->dev, &data, error_detected_iter);
 223        return data.result;
 224}
 225
 226static int mmio_enabled_iter(struct device *device, void *data)
 227{
 228        struct pcie_device *pcie_device;
 229        struct pcie_port_service_driver *driver;
 230        pci_ers_result_t status, *result;
 231
 232        result = (pci_ers_result_t *) data;
 233
 234        if (device->bus == &pcie_port_bus_type && device->driver) {
 235                driver = to_service_driver(device->driver);
 236                if (driver &&
 237                        driver->err_handler &&
 238                        driver->err_handler->mmio_enabled) {
 239                        pcie_device = to_pcie_device(device);
 240
 241                        /* Forward error message to service drivers */
 242                        status = driver->err_handler->mmio_enabled(
 243                                        pcie_device->port);
 244                        *result = merge_result(*result, status);
 245                }
 246        }
 247
 248        return 0;
 249}
 250
 251static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
 252{
 253        pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
 254
 255        /* get true return value from &status */
 256        device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
 257        return status;
 258}
 259
 260static int slot_reset_iter(struct device *device, void *data)
 261{
 262        struct pcie_device *pcie_device;
 263        struct pcie_port_service_driver *driver;
 264        pci_ers_result_t status, *result;
 265
 266        result = (pci_ers_result_t *) data;
 267
 268        if (device->bus == &pcie_port_bus_type && device->driver) {
 269                driver = to_service_driver(device->driver);
 270                if (driver &&
 271                        driver->err_handler &&
 272                        driver->err_handler->slot_reset) {
 273                        pcie_device = to_pcie_device(device);
 274
 275                        /* Forward error message to service drivers */
 276                        status = driver->err_handler->slot_reset(
 277                                        pcie_device->port);
 278                        *result = merge_result(*result, status);
 279                }
 280        }
 281
 282        return 0;
 283}
 284
 285static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
 286{
 287        pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
 288
 289        /* If fatal, restore cfg space for possible link reset at upstream */
 290        if (dev->error_state == pci_channel_io_frozen) {
 291                dev->state_saved = true;
 292                pci_restore_state(dev);
 293                pcie_portdrv_restore_config(dev);
 294                pci_enable_pcie_error_reporting(dev);
 295        }
 296
 297        /* get true return value from &status */
 298        device_for_each_child(&dev->dev, &status, slot_reset_iter);
 299        return status;
 300}
 301
 302static int resume_iter(struct device *device, void *data)
 303{
 304        struct pcie_device *pcie_device;
 305        struct pcie_port_service_driver *driver;
 306
 307        if (device->bus == &pcie_port_bus_type && device->driver) {
 308                driver = to_service_driver(device->driver);
 309                if (driver &&
 310                        driver->err_handler &&
 311                        driver->err_handler->resume) {
 312                        pcie_device = to_pcie_device(device);
 313
 314                        /* Forward error message to service drivers */
 315                        driver->err_handler->resume(pcie_device->port);
 316                }
 317        }
 318
 319        return 0;
 320}
 321
 322static void pcie_portdrv_err_resume(struct pci_dev *dev)
 323{
 324        device_for_each_child(&dev->dev, NULL, resume_iter);
 325}
 326
 327/*
 328 * LINUX Device Driver Model
 329 */
 330static const struct pci_device_id port_pci_ids[] = { {
 331        /* handle any PCI-Express port */
 332        PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
 333        }, { /* end: all zeroes */ }
 334};
 335
 336static const struct pci_error_handlers pcie_portdrv_err_handler = {
 337        .error_detected = pcie_portdrv_error_detected,
 338        .mmio_enabled = pcie_portdrv_mmio_enabled,
 339        .slot_reset = pcie_portdrv_slot_reset,
 340        .resume = pcie_portdrv_err_resume,
 341};
 342
 343static struct pci_driver pcie_portdriver = {
 344        .name           = "pcieport",
 345        .id_table       = &port_pci_ids[0],
 346
 347        .probe          = pcie_portdrv_probe,
 348        .remove         = pcie_portdrv_remove,
 349
 350        .err_handler    = &pcie_portdrv_err_handler,
 351
 352        .driver.pm      = PCIE_PORTDRV_PM_OPS,
 353};
 354
 355static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d)
 356{
 357        pr_notice("%s detected: will not use MSI for PCIe PME signaling\n",
 358                  d->ident);
 359        pcie_pme_disable_msi();
 360        return 0;
 361}
 362
 363static struct dmi_system_id __initdata pcie_portdrv_dmi_table[] = {
 364        /*
 365         * Boxes that should not use MSI for PCIe PME signaling.
 366         */
 367        {
 368         .callback = dmi_pcie_pme_disable_msi,
 369         .ident = "MSI Wind U-100",
 370         .matches = {
 371                     DMI_MATCH(DMI_SYS_VENDOR,
 372                                "MICRO-STAR INTERNATIONAL CO., LTD"),
 373                     DMI_MATCH(DMI_PRODUCT_NAME, "U-100"),
 374                     },
 375         },
 376         {}
 377};
 378
 379static int __init pcie_portdrv_init(void)
 380{
 381        int retval;
 382
 383        if (pcie_ports_disabled)
 384                return pci_register_driver(&pcie_portdriver);
 385
 386        dmi_check_system(pcie_portdrv_dmi_table);
 387
 388        retval = pcie_port_bus_register();
 389        if (retval) {
 390                printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
 391                goto out;
 392        }
 393        retval = pci_register_driver(&pcie_portdriver);
 394        if (retval)
 395                pcie_port_bus_unregister();
 396 out:
 397        return retval;
 398}
 399device_initcall(pcie_portdrv_init);
 400