drivers/pci/pcie/portdrv_pci.c

   1 /*
   2  * File:        portdrv_pci.c
   3  * Purpose:     PCI Express Port Bus Driver
   4  *
   5  * Copyright (C) 2004 Intel
   6  * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/pci.h>
  11 #include <linux/kernel.h>
  12 #include <linux/errno.h>
  13 #include <linux/pm.h>
  14 #include <linux/pm_runtime.h>
  15 #include <linux/init.h>
  16 #include <linux/pcieport_if.h>
  17 #include <linux/aer.h>
  18 #include <linux/dmi.h>
  19 #include <linux/pci-aspm.h>
  20
  21 #include "portdrv.h"
  22 #include "aer/aerdrv.h"
  23
  24 /*
  25  * Version Information
  26  */
  27 #define DRIVER_VERSION "v1.0"
  28 #define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
  29 #define DRIVER_DESC "PCIe Port Bus Driver"
  30 MODULE_AUTHOR(DRIVER_AUTHOR);
  31 MODULE_DESCRIPTION(DRIVER_DESC);
  32 MODULE_LICENSE("GPL");
  33
  34 /* If this switch is set, PCIe port native services should not be enabled. */
  35 bool pcie_ports_disabled;
  36
  37 /*
  38  * If this switch is set, ACPI _OSC will be used to determine whether or not to
  39  * enable PCIe port native services.
  40  */
  41 bool pcie_ports_auto = true;
  42
  43 static int __init pcie_port_setup(char *str)
  44 {
  45         if (!strncmp(str, "compat", 6)) {
  46                 pcie_ports_disabled = true;
  47         } else if (!strncmp(str, "native", 6)) {
  48                 pcie_ports_disabled = false;
  49                 pcie_ports_auto = false;
  50         } else if (!strncmp(str, "auto", 4)) {
  51                 pcie_ports_disabled = false;
  52                 pcie_ports_auto = true;
  53         }
  54
  55         return 1;
  56 }
  57 __setup("pcie_ports=", pcie_port_setup);
  58
  59 /* global data */
  60
  61 /**
  62  * pcie_clear_root_pme_status - Clear root port PME interrupt status.
  63  * @dev: PCIe root port or event collector.
  64  */
  65 void pcie_clear_root_pme_status(struct pci_dev *dev)
  66 {
  67         pcie_capability_set_dword(dev, PCI_EXP_RTSTA, PCI_EXP_RTSTA_PME);
  68 }
  69
  70 static int pcie_portdrv_restore_config(struct pci_dev *dev)
  71 {
  72         int retval;
  73
  74         retval = pci_enable_device(dev);
  75         if (retval)
  76                 return retval;
  77         pci_set_master(dev);
  78         return 0;
  79 }
  80
  81 #ifdef CONFIG_PM
  82 static int pcie_port_resume_noirq(struct device *dev)
  83 {
  84         struct pci_dev *pdev = to_pci_dev(dev);
  85
  86         /*
  87          * Some BIOSes forget to clear Root PME Status bits after system wakeup
  88          * which breaks ACPI-based runtime wakeup on PCI Express, so clear those
  89          * bits now just in case (shouldn't hurt).
  90          */
  91         if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT)
  92                 pcie_clear_root_pme_status(pdev);
  93         return 0;
  94 }
  95
  96 #ifdef CONFIG_PM_RUNTIME
  97 struct d3cold_info {
  98         bool no_d3cold;
  99         unsigned int d3cold_delay;
 100 };
 101
 102 static int pci_dev_d3cold_info(struct pci_dev *pdev, void *data)
 103 {
 104         struct d3cold_info *info = data;
 105
 106         info->d3cold_delay = max_t(unsigned int, pdev->d3cold_delay,
 107                                    info->d3cold_delay);
 108         if (pdev->no_d3cold)
 109                 info->no_d3cold = true;
 110         return 0;
 111 }
 112
 113 static int pcie_port_runtime_suspend(struct device *dev)
 114 {
 115         struct pci_dev *pdev = to_pci_dev(dev);
 116         struct d3cold_info d3cold_info = {
 117                 .no_d3cold      = false,
 118                 .d3cold_delay   = PCI_PM_D3_WAIT,
 119         };
 120
 121         /*
 122          * If any subordinate device disable D3cold, we should not put
 123          * the port into D3cold.  The D3cold delay of port should be
 124          * the max of that of all subordinate devices.
 125          */
 126         pci_walk_bus(pdev->subordinate, pci_dev_d3cold_info, &d3cold_info);
 127         pdev->no_d3cold = d3cold_info.no_d3cold;
 128         pdev->d3cold_delay = d3cold_info.d3cold_delay;
 129         return 0;
 130 }
 131
 132 static int pcie_port_runtime_resume(struct device *dev)
 133 {
 134         return 0;
 135 }
 136
 137 static int pcie_port_runtime_idle(struct device *dev)
 138 {
 139         /* Delay for a short while to prevent too frequent suspend/resume */
 140         pm_schedule_suspend(dev, 10);
 141         return -EBUSY;
 142 }
 143 #else
 144 #define pcie_port_runtime_suspend       NULL
 145 #define pcie_port_runtime_resume        NULL
 146 #define pcie_port_runtime_idle          NULL
 147 #endif
 148
 149 static const struct dev_pm_ops pcie_portdrv_pm_ops = {
 150         .suspend        = pcie_port_device_suspend,
 151         .resume         = pcie_port_device_resume,
 152         .freeze         = pcie_port_device_suspend,
 153         .thaw           = pcie_port_device_resume,
 154         .poweroff       = pcie_port_device_suspend,
 155         .restore        = pcie_port_device_resume,
 156         .resume_noirq   = pcie_port_resume_noirq,
 157         .runtime_suspend = pcie_port_runtime_suspend,
 158         .runtime_resume = pcie_port_runtime_resume,
 159         .runtime_idle   = pcie_port_runtime_idle,
 160 };
 161
 162 #define PCIE_PORTDRV_PM_OPS     (&pcie_portdrv_pm_ops)
 163
 164 #else /* !PM */
 165
 166 #define PCIE_PORTDRV_PM_OPS     NULL
 167 #endif /* !PM */
 168
 169 /*
 170  * PCIe port runtime suspend is broken for some chipsets, so use a
 171  * black list to disable runtime PM for these chipsets.
 172  */
 173 static const struct pci_device_id port_runtime_pm_black_list[] = {
 174         { /* end: all zeroes */ }
 175 };
 176
 177 /*
 178  * pcie_portdrv_probe - Probe PCI-Express port devices
 179  * @dev: PCI-Express port device being probed
 180  *
 181  * If detected invokes the pcie_port_device_register() method for
 182  * this port device.
 183  *
 184  */
 185 static int pcie_portdrv_probe(struct pci_dev *dev,
 186                                         const struct pci_device_id *id)
 187 {
 188         int status;
 189
 190         if (!pci_is_pcie(dev) ||
 191             ((pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) &&
 192              (pci_pcie_type(dev) != PCI_EXP_TYPE_UPSTREAM) &&
 193              (pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM)))
 194                 return -ENODEV;
 195
 196         if (!dev->irq && dev->pin) {
 197                 dev_warn(&dev->dev, "device [%04x:%04x] has invalid IRQ; "
 198                          "check vendor BIOS\n", dev->vendor, dev->device);
 199         }
 200         status = pcie_port_device_register(dev);
 201         if (status)
 202                 return status;
 203
 204         pci_save_state(dev);
 205         /*
 206          * D3cold may not work properly on some PCIe port, so disable
 207          * it by default.
 208          */
 209         dev->d3cold_allowed = false;
 210         if (!pci_match_id(port_runtime_pm_black_list, dev))
 211                 pm_runtime_put_noidle(&dev->dev);
 212
 213         return 0;
 214 }
 215
 216 static void pcie_portdrv_remove(struct pci_dev *dev)
 217 {
 218         if (!pci_match_id(port_runtime_pm_black_list, dev))
 219                 pm_runtime_get_noresume(&dev->dev);
 220         pcie_port_device_remove(dev);
 221         pci_disable_device(dev);
 222 }
 223
 224 static int error_detected_iter(struct device *device, void *data)
 225 {
 226         struct pcie_device *pcie_device;
 227         struct pcie_port_service_driver *driver;
 228         struct aer_broadcast_data *result_data;
 229         pci_ers_result_t status;
 230
 231         result_data = (struct aer_broadcast_data *) data;
 232
 233         if (device->bus == &pcie_port_bus_type && device->driver) {
 234                 driver = to_service_driver(device->driver);
 235                 if (!driver ||
 236                         !driver->err_handler ||
 237                         !driver->err_handler->error_detected)
 238                         return 0;
 239
 240                 pcie_device = to_pcie_device(device);
 241
 242                 /* Forward error detected message to service drivers */
 243                 status = driver->err_handler->error_detected(
 244                         pcie_device->port,
 245                         result_data->state);
 246                 result_data->result =
 247                         merge_result(result_data->result, status);
 248         }
 249
 250         return 0;
 251 }
 252
 253 static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
 254                                         enum pci_channel_state error)
 255 {
 256         struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER};
 257         int ret;
 258
 259         /* can not fail */
 260         ret = device_for_each_child(&dev->dev, &data, error_detected_iter);
 261
 262         return data.result;
 263 }
 264
 265 static int mmio_enabled_iter(struct device *device, void *data)
 266 {
 267         struct pcie_device *pcie_device;
 268         struct pcie_port_service_driver *driver;
 269         pci_ers_result_t status, *result;
 270
 271         result = (pci_ers_result_t *) data;
 272
 273         if (device->bus == &pcie_port_bus_type && device->driver) {
 274                 driver = to_service_driver(device->driver);
 275                 if (driver &&
 276                         driver->err_handler &&
 277                         driver->err_handler->mmio_enabled) {
 278                         pcie_device = to_pcie_device(device);
 279
 280                         /* Forward error message to service drivers */
 281                         status = driver->err_handler->mmio_enabled(
 282                                         pcie_device->port);
 283                         *result = merge_result(*result, status);
 284                 }
 285         }
 286
 287         return 0;
 288 }
 289
 290 static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
 291 {
 292         pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
 293         int retval;
 294
 295         /* get true return value from &status */
 296         retval = device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
 297         return status;
 298 }
 299
 300 static int slot_reset_iter(struct device *device, void *data)
 301 {
 302         struct pcie_device *pcie_device;
 303         struct pcie_port_service_driver *driver;
 304         pci_ers_result_t status, *result;
 305
 306         result = (pci_ers_result_t *) data;
 307
 308         if (device->bus == &pcie_port_bus_type && device->driver) {
 309                 driver = to_service_driver(device->driver);
 310                 if (driver &&
 311                         driver->err_handler &&
 312                         driver->err_handler->slot_reset) {
 313                         pcie_device = to_pcie_device(device);
 314
 315                         /* Forward error message to service drivers */
 316                         status = driver->err_handler->slot_reset(
 317                                         pcie_device->port);
 318                         *result = merge_result(*result, status);
 319                 }
 320         }
 321
 322         return 0;
 323 }
 324
 325 static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
 326 {
 327         pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
 328         int retval;
 329
 330         /* If fatal, restore cfg space for possible link reset at upstream */
 331         if (dev->error_state == pci_channel_io_frozen) {
 332                 dev->state_saved = true;
 333                 pci_restore_state(dev);
 334                 pcie_portdrv_restore_config(dev);
 335                 pci_enable_pcie_error_reporting(dev);
 336         }
 337
 338         /* get true return value from &status */
 339         retval = device_for_each_child(&dev->dev, &status, slot_reset_iter);
 340
 341         return status;
 342 }
 343
 344 static int resume_iter(struct device *device, void *data)
 345 {
 346         struct pcie_device *pcie_device;
 347         struct pcie_port_service_driver *driver;
 348
 349         if (device->bus == &pcie_port_bus_type && device->driver) {
 350                 driver = to_service_driver(device->driver);
 351                 if (driver &&
 352                         driver->err_handler &&
 353                         driver->err_handler->resume) {
 354                         pcie_device = to_pcie_device(device);
 355
 356                         /* Forward error message to service drivers */
 357                         driver->err_handler->resume(pcie_device->port);
 358                 }
 359         }
 360
 361         return 0;
 362 }
 363
 364 static void pcie_portdrv_err_resume(struct pci_dev *dev)
 365 {
 366         int retval;
 367         /* nothing to do with error value, if it ever happens */
 368         retval = device_for_each_child(&dev->dev, NULL, resume_iter);
 369 }
 370
 371 /*
 372  * LINUX Device Driver Model
 373  */
 374 static const struct pci_device_id port_pci_ids[] = { {
 375         /* handle any PCI-Express port */
 376         PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
 377         }, { /* end: all zeroes */ }
 378 };
 379 MODULE_DEVICE_TABLE(pci, port_pci_ids);
 380
 381 static const struct pci_error_handlers pcie_portdrv_err_handler = {
 382         .error_detected = pcie_portdrv_error_detected,
 383         .mmio_enabled = pcie_portdrv_mmio_enabled,
 384         .slot_reset = pcie_portdrv_slot_reset,
 385         .resume = pcie_portdrv_err_resume,
 386 };
 387
 388 static struct pci_driver pcie_portdriver = {
 389         .name           = "pcieport",
 390         .id_table       = &port_pci_ids[0],
 391
 392         .probe          = pcie_portdrv_probe,
 393         .remove         = pcie_portdrv_remove,
 394
 395         .err_handler    = &pcie_portdrv_err_handler,
 396
 397         .driver.pm      = PCIE_PORTDRV_PM_OPS,
 398 };
 399
 400 static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d)
 401 {
 402         pr_notice("%s detected: will not use MSI for PCIe PME signaling\n",
 403                         d->ident);
 404         pcie_pme_disable_msi();
 405         return 0;
 406 }
 407
 408 static struct dmi_system_id __initdata pcie_portdrv_dmi_table[] = {
 409         /*
 410          * Boxes that should not use MSI for PCIe PME signaling.
 411          */
 412         {
 413          .callback = dmi_pcie_pme_disable_msi,
 414          .ident = "MSI Wind U-100",
 415          .matches = {
 416                      DMI_MATCH(DMI_SYS_VENDOR,
 417                                 "MICRO-STAR INTERNATIONAL CO., LTD"),
 418                      DMI_MATCH(DMI_PRODUCT_NAME, "U-100"),
 419                      },
 420          },
 421          {}
 422 };
 423
 424 static int __init pcie_portdrv_init(void)
 425 {
 426         int retval;
 427
 428         if (pcie_ports_disabled)
 429                 return pci_register_driver(&pcie_portdriver);
 430
 431         dmi_check_system(pcie_portdrv_dmi_table);
 432
 433         retval = pcie_port_bus_register();
 434         if (retval) {
 435                 printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
 436                 goto out;
 437         }
 438         retval = pci_register_driver(&pcie_portdriver);
 439         if (retval)
 440                 pcie_port_bus_unregister();
 441  out:
 442         return retval;
 443 }
 444
 445 module_init(pcie_portdrv_init);