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