3 * Purpose: PCI Express Port Bus Driver
5 * Copyright (C) 2004 Intel
6 * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
9 #include <linux/module.h>
10 #include <linux/pci.h>
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
14 #include <linux/init.h>
15 #include <linux/pcieport_if.h>
16 #include <linux/aer.h>
17 #include <linux/dmi.h>
20 #include "aer/aerdrv.h"
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");
32 /* If this switch is set, PCIe port native services should not be enabled. */
33 bool pcie_ports_disabled;
35 static int __init pcie_port_setup(char *str)
37 if (!strncmp(str, "compat", 6))
38 pcie_ports_disabled = true;
42 __setup("pcie_ports=", pcie_port_setup);
46 static int pcie_portdrv_restore_config(struct pci_dev *dev)
50 retval = pci_enable_device(dev);
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,
67 #define PCIE_PORTDRV_PM_OPS (&pcie_portdrv_pm_ops)
71 #define PCIE_PORTDRV_PM_OPS NULL
75 * pcie_portdrv_probe - Probe PCI-Express port devices
76 * @dev: PCI-Express port device being probed
78 * If detected invokes the pcie_port_device_register() method for
82 static int __devinit pcie_portdrv_probe(struct pci_dev *dev,
83 const struct pci_device_id *id)
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)))
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);
97 status = pcie_port_device_register(dev);
106 static void pcie_portdrv_remove(struct pci_dev *dev)
108 pcie_port_device_remove(dev);
109 pci_disable_device(dev);
112 static int error_detected_iter(struct device *device, void *data)
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;
119 result_data = (struct aer_broadcast_data *) data;
121 if (device->bus == &pcie_port_bus_type && device->driver) {
122 driver = to_service_driver(device->driver);
124 !driver->err_handler ||
125 !driver->err_handler->error_detected)
128 pcie_device = to_pcie_device(device);
130 /* Forward error detected message to service drivers */
131 status = driver->err_handler->error_detected(
134 result_data->result =
135 merge_result(result_data->result, status);
141 static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
142 enum pci_channel_state error)
144 struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER};
148 ret = device_for_each_child(&dev->dev, &data, error_detected_iter);
153 static int mmio_enabled_iter(struct device *device, void *data)
155 struct pcie_device *pcie_device;
156 struct pcie_port_service_driver *driver;
157 pci_ers_result_t status, *result;
159 result = (pci_ers_result_t *) data;
161 if (device->bus == &pcie_port_bus_type && device->driver) {
162 driver = to_service_driver(device->driver);
164 driver->err_handler &&
165 driver->err_handler->mmio_enabled) {
166 pcie_device = to_pcie_device(device);
168 /* Forward error message to service drivers */
169 status = driver->err_handler->mmio_enabled(
171 *result = merge_result(*result, status);
178 static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
180 pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
183 /* get true return value from &status */
184 retval = device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
188 static int slot_reset_iter(struct device *device, void *data)
190 struct pcie_device *pcie_device;
191 struct pcie_port_service_driver *driver;
192 pci_ers_result_t status, *result;
194 result = (pci_ers_result_t *) data;
196 if (device->bus == &pcie_port_bus_type && device->driver) {
197 driver = to_service_driver(device->driver);
199 driver->err_handler &&
200 driver->err_handler->slot_reset) {
201 pcie_device = to_pcie_device(device);
203 /* Forward error message to service drivers */
204 status = driver->err_handler->slot_reset(
206 *result = merge_result(*result, status);
213 static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
215 pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
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);
226 /* get true return value from &status */
227 retval = device_for_each_child(&dev->dev, &status, slot_reset_iter);
232 static int resume_iter(struct device *device, void *data)
234 struct pcie_device *pcie_device;
235 struct pcie_port_service_driver *driver;
237 if (device->bus == &pcie_port_bus_type && device->driver) {
238 driver = to_service_driver(device->driver);
240 driver->err_handler &&
241 driver->err_handler->resume) {
242 pcie_device = to_pcie_device(device);
244 /* Forward error message to service drivers */
245 driver->err_handler->resume(pcie_device->port);
252 static void pcie_portdrv_err_resume(struct pci_dev *dev)
255 /* nothing to do with error value, if it ever happens */
256 retval = device_for_each_child(&dev->dev, NULL, resume_iter);
260 * LINUX Device Driver Model
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 */ }
267 MODULE_DEVICE_TABLE(pci, port_pci_ids);
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,
276 static struct pci_driver pcie_portdriver = {
278 .id_table = &port_pci_ids[0],
280 .probe = pcie_portdrv_probe,
281 .remove = pcie_portdrv_remove,
283 .err_handler = &pcie_portdrv_err_handler,
285 .driver.pm = PCIE_PORTDRV_PM_OPS,
288 static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d)
290 pr_notice("%s detected: will not use MSI for PCIe PME signaling\n",
292 pcie_pme_disable_msi();
296 static struct dmi_system_id __initdata pcie_portdrv_dmi_table[] = {
298 * Boxes that should not use MSI for PCIe PME signaling.
301 .callback = dmi_pcie_pme_disable_msi,
302 .ident = "MSI Wind U-100",
304 DMI_MATCH(DMI_SYS_VENDOR,
305 "MICRO-STAR INTERNATIONAL CO., LTD"),
306 DMI_MATCH(DMI_PRODUCT_NAME, "U-100"),
312 static int __init pcie_portdrv_init(void)
316 if (pcie_ports_disabled)
319 dmi_check_system(pcie_portdrv_dmi_table);
321 retval = pcie_port_bus_register();
323 printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
326 retval = pci_register_driver(&pcie_portdriver);
328 pcie_port_bus_unregister();
333 static void __exit pcie_portdrv_exit(void)
335 pci_unregister_driver(&pcie_portdriver);
336 pcie_port_bus_unregister();
339 module_init(pcie_portdrv_init);
340 module_exit(pcie_portdrv_exit);