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/slab.h>
  16 #include <linux/pcieport_if.h>
  17 #include <linux/aer.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 /* global data */
  33
  34 static int pcie_portdrv_restore_config(struct pci_dev *dev)
  35 {
  36         int retval;
  37
  38         retval = pci_enable_device(dev);
  39         if (retval)
  40                 return retval;
  41         pci_set_master(dev);
  42         return 0;
  43 }
  44
  45 #ifdef CONFIG_PM
  46 static struct dev_pm_ops pcie_portdrv_pm_ops = {
  47         .suspend        = pcie_port_device_suspend,
  48         .resume         = pcie_port_device_resume,
  49         .freeze         = pcie_port_device_suspend,
  50         .thaw           = pcie_port_device_resume,
  51         .poweroff       = pcie_port_device_suspend,
  52         .restore        = pcie_port_device_resume,
  53 };
  54
  55 #define PCIE_PORTDRV_PM_OPS     (&pcie_portdrv_pm_ops)
  56
  57 #else /* !PM */
  58
  59 #define PCIE_PORTDRV_PM_OPS     NULL
  60 #endif /* !PM */
  61
  62 /*
  63  * pcie_portdrv_probe - Probe PCI-Express port devices
  64  * @dev: PCI-Express port device being probed
  65  *
  66  * If detected invokes the pcie_port_device_register() method for
  67  * this port device.
  68  *
  69  */
  70 static int __devinit pcie_portdrv_probe (struct pci_dev *dev,
  71                                 const struct pci_device_id *id )
  72 {
  73         int                     status;
  74
  75         status = pcie_port_device_probe(dev);
  76         if (status)
  77                 return status;
  78
  79         if (!dev->irq && dev->pin) {
  80                 dev_warn(&dev->dev, "device [%04x:%04x] has invalid IRQ; "
  81                          "check vendor BIOS\n", dev->vendor, dev->device);
  82         }
  83         status = pcie_port_device_register(dev);
  84         if (status)
  85                 return status;
  86
  87         pci_save_state(dev);
  88
  89         return 0;
  90 }
  91
  92 static void pcie_portdrv_remove (struct pci_dev *dev)
  93 {
  94         pcie_port_device_remove(dev);
  95         pci_disable_device(dev);
  96 }
  97
  98 static int error_detected_iter(struct device *device, void *data)
  99 {
 100         struct pcie_device *pcie_device;
 101         struct pcie_port_service_driver *driver;
 102         struct aer_broadcast_data *result_data;
 103         pci_ers_result_t status;
 104
 105         result_data = (struct aer_broadcast_data *) data;
 106
 107         if (device->bus == &pcie_port_bus_type && device->driver) {
 108                 driver = to_service_driver(device->driver);
 109                 if (!driver ||
 110                         !driver->err_handler ||
 111                         !driver->err_handler->error_detected)
 112                         return 0;
 113
 114                 pcie_device = to_pcie_device(device);
 115
 116                 /* Forward error detected message to service drivers */
 117                 status = driver->err_handler->error_detected(
 118                         pcie_device->port,
 119                         result_data->state);
 120                 result_data->result =
 121                         merge_result(result_data->result, status);
 122         }
 123
 124         return 0;
 125 }
 126
 127 static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
 128                                         enum pci_channel_state error)
 129 {
 130         struct aer_broadcast_data result_data =
 131                         {error, PCI_ERS_RESULT_CAN_RECOVER};
 132         int retval;
 133
 134         /* can not fail */
 135         retval = device_for_each_child(&dev->dev, &result_data, error_detected_iter);
 136
 137         return result_data.result;
 138 }
 139
 140 static int mmio_enabled_iter(struct device *device, void *data)
 141 {
 142         struct pcie_device *pcie_device;
 143         struct pcie_port_service_driver *driver;
 144         pci_ers_result_t status, *result;
 145
 146         result = (pci_ers_result_t *) data;
 147
 148         if (device->bus == &pcie_port_bus_type && device->driver) {
 149                 driver = to_service_driver(device->driver);
 150                 if (driver &&
 151                         driver->err_handler &&
 152                         driver->err_handler->mmio_enabled) {
 153                         pcie_device = to_pcie_device(device);
 154
 155                         /* Forward error message to service drivers */
 156                         status = driver->err_handler->mmio_enabled(
 157                                         pcie_device->port);
 158                         *result = merge_result(*result, status);
 159                 }
 160         }
 161
 162         return 0;
 163 }
 164
 165 static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
 166 {
 167         pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
 168         int retval;
 169
 170         /* get true return value from &status */
 171         retval = device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
 172         return status;
 173 }
 174
 175 static int slot_reset_iter(struct device *device, void *data)
 176 {
 177         struct pcie_device *pcie_device;
 178         struct pcie_port_service_driver *driver;
 179         pci_ers_result_t status, *result;
 180
 181         result = (pci_ers_result_t *) data;
 182
 183         if (device->bus == &pcie_port_bus_type && device->driver) {
 184                 driver = to_service_driver(device->driver);
 185                 if (driver &&
 186                         driver->err_handler &&
 187                         driver->err_handler->slot_reset) {
 188                         pcie_device = to_pcie_device(device);
 189
 190                         /* Forward error message to service drivers */
 191                         status = driver->err_handler->slot_reset(
 192                                         pcie_device->port);
 193                         *result = merge_result(*result, status);
 194                 }
 195         }
 196
 197         return 0;
 198 }
 199
 200 static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
 201 {
 202         pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
 203         int retval;
 204
 205         /* If fatal, restore cfg space for possible link reset at upstream */
 206         if (dev->error_state == pci_channel_io_frozen) {
 207                 dev->state_saved = true;
 208                 pci_restore_state(dev);
 209                 pcie_portdrv_restore_config(dev);
 210                 pci_enable_pcie_error_reporting(dev);
 211         }
 212
 213         /* get true return value from &status */
 214         retval = device_for_each_child(&dev->dev, &status, slot_reset_iter);
 215
 216         return status;
 217 }
 218
 219 static int resume_iter(struct device *device, void *data)
 220 {
 221         struct pcie_device *pcie_device;
 222         struct pcie_port_service_driver *driver;
 223
 224         if (device->bus == &pcie_port_bus_type && device->driver) {
 225                 driver = to_service_driver(device->driver);
 226                 if (driver &&
 227                         driver->err_handler &&
 228                         driver->err_handler->resume) {
 229                         pcie_device = to_pcie_device(device);
 230
 231                         /* Forward error message to service drivers */
 232                         driver->err_handler->resume(pcie_device->port);
 233                 }
 234         }
 235
 236         return 0;
 237 }
 238
 239 static void pcie_portdrv_err_resume(struct pci_dev *dev)
 240 {
 241         int retval;
 242         /* nothing to do with error value, if it ever happens */
 243         retval = device_for_each_child(&dev->dev, NULL, resume_iter);
 244 }
 245
 246 /*
 247  * LINUX Device Driver Model
 248  */
 249 static const struct pci_device_id port_pci_ids[] = { {
 250         /* handle any PCI-Express port */
 251         PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
 252         }, { /* end: all zeroes */ }
 253 };
 254 MODULE_DEVICE_TABLE(pci, port_pci_ids);
 255
 256 static struct pci_error_handlers pcie_portdrv_err_handler = {
 257                 .error_detected = pcie_portdrv_error_detected,
 258                 .mmio_enabled = pcie_portdrv_mmio_enabled,
 259                 .slot_reset = pcie_portdrv_slot_reset,
 260                 .resume = pcie_portdrv_err_resume,
 261 };
 262
 263 static struct pci_driver pcie_portdriver = {
 264         .name           = "pcieport",
 265         .id_table       = &port_pci_ids[0],
 266
 267         .probe          = pcie_portdrv_probe,
 268         .remove         = pcie_portdrv_remove,
 269
 270         .err_handler    = &pcie_portdrv_err_handler,
 271
 272         .driver.pm      = PCIE_PORTDRV_PM_OPS,
 273 };
 274
 275 static int __init pcie_portdrv_init(void)
 276 {
 277         int retval;
 278
 279         retval = pcie_port_bus_register();
 280         if (retval) {
 281                 printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
 282                 goto out;
 283         }
 284         retval = pci_register_driver(&pcie_portdriver);
 285         if (retval)
 286                 pcie_port_bus_unregister();
 287  out:
 288         return retval;
 289 }
 290
 291 static void __exit pcie_portdrv_exit(void)
 292 {
 293         pci_unregister_driver(&pcie_portdriver);
 294         pcie_port_bus_unregister();
 295 }
 296
 297 module_init(pcie_portdrv_init);
 298 module_exit(pcie_portdrv_exit);