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