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 #include <linux/dmi.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 /* global data */
  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 const struct dev_pm_ops pcie_portdrv_pm_ops = {
  48         .suspend        = pcie_port_device_suspend,
  49         .resume         = pcie_port_device_resume,
  50         .freeze         = pcie_port_device_suspend,
  51         .thaw           = pcie_port_device_resume,
  52         .poweroff       = pcie_port_device_suspend,
  53         .restore        = pcie_port_device_resume,
  54 };
  55
  56 #define PCIE_PORTDRV_PM_OPS     (&pcie_portdrv_pm_ops)
  57
  58 #else /* !PM */
  59
  60 #define PCIE_PORTDRV_PM_OPS     NULL
  61 #endif /* !PM */
  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         if (!pci_is_pcie(dev) ||
  77             ((dev->pcie_type != PCI_EXP_TYPE_ROOT_PORT) &&
  78              (dev->pcie_type != PCI_EXP_TYPE_UPSTREAM) &&
  79              (dev->pcie_type != PCI_EXP_TYPE_DOWNSTREAM)))
  80                 return -ENODEV;
  81
  82         if (!dev->irq && dev->pin) {
  83                 dev_warn(&dev->dev, "device [%04x:%04x] has invalid IRQ; "
  84                          "check vendor BIOS\n", dev->vendor, dev->device);
  85         }
  86         status = pcie_port_device_register(dev);
  87         if (status)
  88                 return status;
  89
  90         pci_save_state(dev);
  91
  92         return 0;
  93 }
  94
  95 static void pcie_portdrv_remove(struct pci_dev *dev)
  96 {
  97         pcie_port_device_remove(dev);
  98         pci_disable_device(dev);
  99 }
 100
 101 static int error_detected_iter(struct device *device, void *data)
 102 {
 103         struct pcie_device *pcie_device;
 104         struct pcie_port_service_driver *driver;
 105         struct aer_broadcast_data *result_data;
 106         pci_ers_result_t status;
 107
 108         result_data = (struct aer_broadcast_data *) data;
 109
 110         if (device->bus == &pcie_port_bus_type && device->driver) {
 111                 driver = to_service_driver(device->driver);
 112                 if (!driver ||
 113                         !driver->err_handler ||
 114                         !driver->err_handler->error_detected)
 115                         return 0;
 116
 117                 pcie_device = to_pcie_device(device);
 118
 119                 /* Forward error detected message to service drivers */
 120                 status = driver->err_handler->error_detected(
 121                         pcie_device->port,
 122                         result_data->state);
 123                 result_data->result =
 124                         merge_result(result_data->result, status);
 125         }
 126
 127         return 0;
 128 }
 129
 130 static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
 131                                         enum pci_channel_state error)
 132 {
 133         struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER};
 134         int ret;
 135
 136         /* can not fail */
 137         ret = device_for_each_child(&dev->dev, &data, error_detected_iter);
 138
 139         return 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_RECOVERED;
 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                 dev->state_saved = true;
 210                 pci_restore_state(dev);
 211                 pcie_portdrv_restore_config(dev);
 212                 pci_enable_pcie_error_reporting(dev);
 213         }
 214
 215         /* get true return value from &status */
 216         retval = device_for_each_child(&dev->dev, &status, slot_reset_iter);
 217
 218         return status;
 219 }
 220
 221 static int resume_iter(struct device *device, void *data)
 222 {
 223         struct pcie_device *pcie_device;
 224         struct pcie_port_service_driver *driver;
 225
 226         if (device->bus == &pcie_port_bus_type && device->driver) {
 227                 driver = to_service_driver(device->driver);
 228                 if (driver &&
 229                         driver->err_handler &&
 230                         driver->err_handler->resume) {
 231                         pcie_device = to_pcie_device(device);
 232
 233                         /* Forward error message to service drivers */
 234                         driver->err_handler->resume(pcie_device->port);
 235                 }
 236         }
 237
 238         return 0;
 239 }
 240
 241 static void pcie_portdrv_err_resume(struct pci_dev *dev)
 242 {
 243         int retval;
 244         /* nothing to do with error value, if it ever happens */
 245         retval = device_for_each_child(&dev->dev, NULL, resume_iter);
 246 }
 247
 248 /*
 249  * LINUX Device Driver Model
 250  */
 251 static const struct pci_device_id port_pci_ids[] = { {
 252         /* handle any PCI-Express port */
 253         PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
 254         }, { /* end: all zeroes */ }
 255 };
 256 MODULE_DEVICE_TABLE(pci, port_pci_ids);
 257
 258 static struct pci_error_handlers pcie_portdrv_err_handler = {
 259                 .error_detected = pcie_portdrv_error_detected,
 260                 .mmio_enabled = pcie_portdrv_mmio_enabled,
 261                 .slot_reset = pcie_portdrv_slot_reset,
 262                 .resume = pcie_portdrv_err_resume,
 263 };
 264
 265 static struct pci_driver pcie_portdriver = {
 266         .name           = "pcieport",
 267         .id_table       = &port_pci_ids[0],
 268
 269         .probe          = pcie_portdrv_probe,
 270         .remove         = pcie_portdrv_remove,
 271
 272         .err_handler    = &pcie_portdrv_err_handler,
 273
 274         .driver.pm      = PCIE_PORTDRV_PM_OPS,
 275 };
 276
 277 static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d)
 278 {
 279         pr_notice("%s detected: will not use MSI for PCIe PME signaling\n",
 280                         d->ident);
 281         pcie_pme_disable_msi();
 282         return 0;
 283 }
 284
 285 static struct dmi_system_id __initdata pcie_portdrv_dmi_table[] = {
 286         /*
 287          * Boxes that should not use MSI for PCIe PME signaling.
 288          */
 289         {
 290          .callback = dmi_pcie_pme_disable_msi,
 291          .ident = "MSI Wind U-100",
 292          .matches = {
 293                      DMI_MATCH(DMI_SYS_VENDOR,
 294                                 "MICRO-STAR INTERNATIONAL CO., LTD"),
 295                      DMI_MATCH(DMI_PRODUCT_NAME, "U-100"),
 296                      },
 297          },
 298          {}
 299 };
 300
 301 static int __init pcie_portdrv_init(void)
 302 {
 303         int retval;
 304
 305         dmi_check_system(pcie_portdrv_dmi_table);
 306
 307         retval = pcie_port_bus_register();
 308         if (retval) {
 309                 printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
 310                 goto out;
 311         }
 312         retval = pci_register_driver(&pcie_portdriver);
 313         if (retval)
 314                 pcie_port_bus_unregister();
 315  out:
 316         return retval;
 317 }
 318
 319 static void __exit pcie_portdrv_exit(void)
 320 {
 321         pci_unregister_driver(&pcie_portdriver);
 322         pcie_port_bus_unregister();
 323 }
 324
 325 module_init(pcie_portdrv_init);
 326 module_exit(pcie_portdrv_exit);