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/init.h>
  15 #include <linux/pcieport_if.h>
  16 #include <linux/aer.h>
  17 #include <linux/dmi.h>
  18 #include <linux/pci-aspm.h>
  19
  20 #include "portdrv.h"
  21 #include "aer/aerdrv.h"
  22
  23 /*
  24  * Version Information
  25  */
  26 #define DRIVER_VERSION "v1.0"
  27 #define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
  28 #define DRIVER_DESC "PCIe Port Bus Driver"
  29 MODULE_AUTHOR(DRIVER_AUTHOR);
  30 MODULE_DESCRIPTION(DRIVER_DESC);
  31 MODULE_LICENSE("GPL");
  32
  33 /* If this switch is set, PCIe port native services should not be enabled. */
  34 bool pcie_ports_disabled;
  35
  36 /*
  37  * If this switch is set, ACPI _OSC will be used to determine whether or not to
  38  * enable PCIe port native services.
  39  */
  40 bool pcie_ports_auto = true;
  41
  42 static int __init pcie_port_setup(char *str)
  43 {
  44         if (!strncmp(str, "compat", 6)) {
  45                 pcie_ports_disabled = true;
  46         } else if (!strncmp(str, "native", 6)) {
  47                 pcie_ports_disabled = false;
  48                 pcie_ports_auto = false;
  49         } else if (!strncmp(str, "auto", 4)) {
  50                 pcie_ports_disabled = false;
  51                 pcie_ports_auto = true;
  52         }
  53
  54         return 1;
  55 }
  56 __setup("pcie_ports=", pcie_port_setup);
  57
  58 /* global data */
  59
  60 static int pcie_portdrv_restore_config(struct pci_dev *dev)
  61 {
  62         int retval;
  63
  64         retval = pci_enable_device(dev);
  65         if (retval)
  66                 return retval;
  67         pci_set_master(dev);
  68         return 0;
  69 }
  70
  71 #ifdef CONFIG_PM
  72 static const struct dev_pm_ops pcie_portdrv_pm_ops = {
  73         .suspend        = pcie_port_device_suspend,
  74         .resume         = pcie_port_device_resume,
  75         .freeze         = pcie_port_device_suspend,
  76         .thaw           = pcie_port_device_resume,
  77         .poweroff       = pcie_port_device_suspend,
  78         .restore        = pcie_port_device_resume,
  79 };
  80
  81 #define PCIE_PORTDRV_PM_OPS     (&pcie_portdrv_pm_ops)
  82
  83 #else /* !PM */
  84
  85 #define PCIE_PORTDRV_PM_OPS     NULL
  86 #endif /* !PM */
  87
  88 /*
  89  * pcie_portdrv_probe - Probe PCI-Express port devices
  90  * @dev: PCI-Express port device being probed
  91  *
  92  * If detected invokes the pcie_port_device_register() method for
  93  * this port device.
  94  *
  95  */
  96 static int __devinit pcie_portdrv_probe(struct pci_dev *dev,
  97                                         const struct pci_device_id *id)
  98 {
  99         int status;
 100
 101         if (!pci_is_pcie(dev) ||
 102             ((dev->pcie_type != PCI_EXP_TYPE_ROOT_PORT) &&
 103              (dev->pcie_type != PCI_EXP_TYPE_UPSTREAM) &&
 104              (dev->pcie_type != PCI_EXP_TYPE_DOWNSTREAM)))
 105                 return -ENODEV;
 106
 107         if (!dev->irq && dev->pin) {
 108                 dev_warn(&dev->dev, "device [%04x:%04x] has invalid IRQ; "
 109                          "check vendor BIOS\n", dev->vendor, dev->device);
 110         }
 111         status = pcie_port_device_register(dev);
 112         if (status)
 113                 return status;
 114
 115         pci_save_state(dev);
 116
 117         return 0;
 118 }
 119
 120 static void pcie_portdrv_remove(struct pci_dev *dev)
 121 {
 122         pcie_port_device_remove(dev);
 123         pci_disable_device(dev);
 124 }
 125
 126 static int error_detected_iter(struct device *device, void *data)
 127 {
 128         struct pcie_device *pcie_device;
 129         struct pcie_port_service_driver *driver;
 130         struct aer_broadcast_data *result_data;
 131         pci_ers_result_t status;
 132
 133         result_data = (struct aer_broadcast_data *) data;
 134
 135         if (device->bus == &pcie_port_bus_type && device->driver) {
 136                 driver = to_service_driver(device->driver);
 137                 if (!driver ||
 138                         !driver->err_handler ||
 139                         !driver->err_handler->error_detected)
 140                         return 0;
 141
 142                 pcie_device = to_pcie_device(device);
 143
 144                 /* Forward error detected message to service drivers */
 145                 status = driver->err_handler->error_detected(
 146                         pcie_device->port,
 147                         result_data->state);
 148                 result_data->result =
 149                         merge_result(result_data->result, status);
 150         }
 151
 152         return 0;
 153 }
 154
 155 static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
 156                                         enum pci_channel_state error)
 157 {
 158         struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER};
 159         int ret;
 160
 161         /* can not fail */
 162         ret = device_for_each_child(&dev->dev, &data, error_detected_iter);
 163
 164         return data.result;
 165 }
 166
 167 static int mmio_enabled_iter(struct device *device, void *data)
 168 {
 169         struct pcie_device *pcie_device;
 170         struct pcie_port_service_driver *driver;
 171         pci_ers_result_t status, *result;
 172
 173         result = (pci_ers_result_t *) data;
 174
 175         if (device->bus == &pcie_port_bus_type && device->driver) {
 176                 driver = to_service_driver(device->driver);
 177                 if (driver &&
 178                         driver->err_handler &&
 179                         driver->err_handler->mmio_enabled) {
 180                         pcie_device = to_pcie_device(device);
 181
 182                         /* Forward error message to service drivers */
 183                         status = driver->err_handler->mmio_enabled(
 184                                         pcie_device->port);
 185                         *result = merge_result(*result, status);
 186                 }
 187         }
 188
 189         return 0;
 190 }
 191
 192 static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
 193 {
 194         pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
 195         int retval;
 196
 197         /* get true return value from &status */
 198         retval = device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
 199         return status;
 200 }
 201
 202 static int slot_reset_iter(struct device *device, void *data)
 203 {
 204         struct pcie_device *pcie_device;
 205         struct pcie_port_service_driver *driver;
 206         pci_ers_result_t status, *result;
 207
 208         result = (pci_ers_result_t *) data;
 209
 210         if (device->bus == &pcie_port_bus_type && device->driver) {
 211                 driver = to_service_driver(device->driver);
 212                 if (driver &&
 213                         driver->err_handler &&
 214                         driver->err_handler->slot_reset) {
 215                         pcie_device = to_pcie_device(device);
 216
 217                         /* Forward error message to service drivers */
 218                         status = driver->err_handler->slot_reset(
 219                                         pcie_device->port);
 220                         *result = merge_result(*result, status);
 221                 }
 222         }
 223
 224         return 0;
 225 }
 226
 227 static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
 228 {
 229         pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
 230         int retval;
 231
 232         /* If fatal, restore cfg space for possible link reset at upstream */
 233         if (dev->error_state == pci_channel_io_frozen) {
 234                 dev->state_saved = true;
 235                 pci_restore_state(dev);
 236                 pcie_portdrv_restore_config(dev);
 237                 pci_enable_pcie_error_reporting(dev);
 238         }
 239
 240         /* get true return value from &status */
 241         retval = device_for_each_child(&dev->dev, &status, slot_reset_iter);
 242
 243         return status;
 244 }
 245
 246 static int resume_iter(struct device *device, void *data)
 247 {
 248         struct pcie_device *pcie_device;
 249         struct pcie_port_service_driver *driver;
 250
 251         if (device->bus == &pcie_port_bus_type && device->driver) {
 252                 driver = to_service_driver(device->driver);
 253                 if (driver &&
 254                         driver->err_handler &&
 255                         driver->err_handler->resume) {
 256                         pcie_device = to_pcie_device(device);
 257
 258                         /* Forward error message to service drivers */
 259                         driver->err_handler->resume(pcie_device->port);
 260                 }
 261         }
 262
 263         return 0;
 264 }
 265
 266 static void pcie_portdrv_err_resume(struct pci_dev *dev)
 267 {
 268         int retval;
 269         /* nothing to do with error value, if it ever happens */
 270         retval = device_for_each_child(&dev->dev, NULL, resume_iter);
 271 }
 272
 273 /*
 274  * LINUX Device Driver Model
 275  */
 276 static const struct pci_device_id port_pci_ids[] = { {
 277         /* handle any PCI-Express port */
 278         PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
 279         }, { /* end: all zeroes */ }
 280 };
 281 MODULE_DEVICE_TABLE(pci, port_pci_ids);
 282
 283 static struct pci_error_handlers pcie_portdrv_err_handler = {
 284                 .error_detected = pcie_portdrv_error_detected,
 285                 .mmio_enabled = pcie_portdrv_mmio_enabled,
 286                 .slot_reset = pcie_portdrv_slot_reset,
 287                 .resume = pcie_portdrv_err_resume,
 288 };
 289
 290 static struct pci_driver pcie_portdriver = {
 291         .name           = "pcieport",
 292         .id_table       = &port_pci_ids[0],
 293
 294         .probe          = pcie_portdrv_probe,
 295         .remove         = pcie_portdrv_remove,
 296
 297         .err_handler    = &pcie_portdrv_err_handler,
 298
 299         .driver.pm      = PCIE_PORTDRV_PM_OPS,
 300 };
 301
 302 static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d)
 303 {
 304         pr_notice("%s detected: will not use MSI for PCIe PME signaling\n",
 305                         d->ident);
 306         pcie_pme_disable_msi();
 307         return 0;
 308 }
 309
 310 static struct dmi_system_id __initdata pcie_portdrv_dmi_table[] = {
 311         /*
 312          * Boxes that should not use MSI for PCIe PME signaling.
 313          */
 314         {
 315          .callback = dmi_pcie_pme_disable_msi,
 316          .ident = "MSI Wind U-100",
 317          .matches = {
 318                      DMI_MATCH(DMI_SYS_VENDOR,
 319                                 "MICRO-STAR INTERNATIONAL CO., LTD"),
 320                      DMI_MATCH(DMI_PRODUCT_NAME, "U-100"),
 321                      },
 322          },
 323          {}
 324 };
 325
 326 static int __init pcie_portdrv_init(void)
 327 {
 328         int retval;
 329
 330         if (pcie_ports_disabled) {
 331                 pcie_no_aspm();
 332                 return -EACCES;
 333         }
 334
 335         dmi_check_system(pcie_portdrv_dmi_table);
 336
 337         retval = pcie_port_bus_register();
 338         if (retval) {
 339                 printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
 340                 goto out;
 341         }
 342         retval = pci_register_driver(&pcie_portdriver);
 343         if (retval)
 344                 pcie_port_bus_unregister();
 345  out:
 346         return retval;
 347 }
 348
 349 module_init(pcie_portdrv_init);