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/pm_runtime.h>
15 #include <linux/init.h>
16 #include <linux/pcieport_if.h>
17 #include <linux/aer.h>
18 #include <linux/dmi.h>
19 #include <linux/pci-aspm.h>
22 #include "aer/aerdrv.h"
27 #define DRIVER_VERSION "v1.0"
28 #define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
29 #define DRIVER_DESC "PCIe Port Bus Driver"
30 MODULE_AUTHOR(DRIVER_AUTHOR);
31 MODULE_DESCRIPTION(DRIVER_DESC);
32 MODULE_LICENSE("GPL");
34 /* If this switch is set, PCIe port native services should not be enabled. */
35 bool pcie_ports_disabled;
38 * If this switch is set, ACPI _OSC will be used to determine whether or not to
39 * enable PCIe port native services.
41 bool pcie_ports_auto = true;
43 static int __init pcie_port_setup(char *str)
45 if (!strncmp(str, "compat", 6)) {
46 pcie_ports_disabled = true;
47 } else if (!strncmp(str, "native", 6)) {
48 pcie_ports_disabled = false;
49 pcie_ports_auto = false;
50 } else if (!strncmp(str, "auto", 4)) {
51 pcie_ports_disabled = false;
52 pcie_ports_auto = true;
57 __setup("pcie_ports=", pcie_port_setup);
62 * pcie_clear_root_pme_status - Clear root port PME interrupt status.
63 * @dev: PCIe root port or event collector.
65 void pcie_clear_root_pme_status(struct pci_dev *dev)
67 pcie_capability_set_dword(dev, PCI_EXP_RTSTA, PCI_EXP_RTSTA_PME);
70 static int pcie_portdrv_restore_config(struct pci_dev *dev)
74 retval = pci_enable_device(dev);
82 static int pcie_port_resume_noirq(struct device *dev)
84 struct pci_dev *pdev = to_pci_dev(dev);
87 * Some BIOSes forget to clear Root PME Status bits after system wakeup
88 * which breaks ACPI-based runtime wakeup on PCI Express, so clear those
89 * bits now just in case (shouldn't hurt).
91 if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT)
92 pcie_clear_root_pme_status(pdev);
96 static const struct dev_pm_ops pcie_portdrv_pm_ops = {
97 .suspend = pcie_port_device_suspend,
98 .resume = pcie_port_device_resume,
99 .freeze = pcie_port_device_suspend,
100 .thaw = pcie_port_device_resume,
101 .poweroff = pcie_port_device_suspend,
102 .restore = pcie_port_device_resume,
103 .resume_noirq = pcie_port_resume_noirq,
106 #define PCIE_PORTDRV_PM_OPS (&pcie_portdrv_pm_ops)
110 #define PCIE_PORTDRV_PM_OPS NULL
114 * pcie_portdrv_probe - Probe PCI-Express port devices
115 * @dev: PCI-Express port device being probed
117 * If detected invokes the pcie_port_device_register() method for
121 static int pcie_portdrv_probe(struct pci_dev *dev,
122 const struct pci_device_id *id)
126 if (!pci_is_pcie(dev) ||
127 ((pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) &&
128 (pci_pcie_type(dev) != PCI_EXP_TYPE_UPSTREAM) &&
129 (pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM)))
132 status = pcie_port_device_register(dev);
138 * D3cold may not work properly on some PCIe port, so disable
141 dev->d3cold_allowed = false;
145 static void pcie_portdrv_remove(struct pci_dev *dev)
147 pcie_port_device_remove(dev);
150 static int error_detected_iter(struct device *device, void *data)
152 struct pcie_device *pcie_device;
153 struct pcie_port_service_driver *driver;
154 struct aer_broadcast_data *result_data;
155 pci_ers_result_t status;
157 result_data = (struct aer_broadcast_data *) data;
159 if (device->bus == &pcie_port_bus_type && device->driver) {
160 driver = to_service_driver(device->driver);
162 !driver->err_handler ||
163 !driver->err_handler->error_detected)
166 pcie_device = to_pcie_device(device);
168 /* Forward error detected message to service drivers */
169 status = driver->err_handler->error_detected(
172 result_data->result =
173 merge_result(result_data->result, status);
179 static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
180 enum pci_channel_state error)
182 struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER};
184 /* get true return value from &data */
185 device_for_each_child(&dev->dev, &data, error_detected_iter);
189 static int mmio_enabled_iter(struct device *device, void *data)
191 struct pcie_device *pcie_device;
192 struct pcie_port_service_driver *driver;
193 pci_ers_result_t status, *result;
195 result = (pci_ers_result_t *) data;
197 if (device->bus == &pcie_port_bus_type && device->driver) {
198 driver = to_service_driver(device->driver);
200 driver->err_handler &&
201 driver->err_handler->mmio_enabled) {
202 pcie_device = to_pcie_device(device);
204 /* Forward error message to service drivers */
205 status = driver->err_handler->mmio_enabled(
207 *result = merge_result(*result, status);
214 static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
216 pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
218 /* get true return value from &status */
219 device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
223 static int slot_reset_iter(struct device *device, void *data)
225 struct pcie_device *pcie_device;
226 struct pcie_port_service_driver *driver;
227 pci_ers_result_t status, *result;
229 result = (pci_ers_result_t *) data;
231 if (device->bus == &pcie_port_bus_type && device->driver) {
232 driver = to_service_driver(device->driver);
234 driver->err_handler &&
235 driver->err_handler->slot_reset) {
236 pcie_device = to_pcie_device(device);
238 /* Forward error message to service drivers */
239 status = driver->err_handler->slot_reset(
241 *result = merge_result(*result, status);
248 static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
250 pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
252 /* If fatal, restore cfg space for possible link reset at upstream */
253 if (dev->error_state == pci_channel_io_frozen) {
254 dev->state_saved = true;
255 pci_restore_state(dev);
256 pcie_portdrv_restore_config(dev);
257 pci_enable_pcie_error_reporting(dev);
260 /* get true return value from &status */
261 device_for_each_child(&dev->dev, &status, slot_reset_iter);
265 static int resume_iter(struct device *device, void *data)
267 struct pcie_device *pcie_device;
268 struct pcie_port_service_driver *driver;
270 if (device->bus == &pcie_port_bus_type && device->driver) {
271 driver = to_service_driver(device->driver);
273 driver->err_handler &&
274 driver->err_handler->resume) {
275 pcie_device = to_pcie_device(device);
277 /* Forward error message to service drivers */
278 driver->err_handler->resume(pcie_device->port);
285 static void pcie_portdrv_err_resume(struct pci_dev *dev)
287 device_for_each_child(&dev->dev, NULL, resume_iter);
291 * LINUX Device Driver Model
293 static const struct pci_device_id port_pci_ids[] = { {
294 /* handle any PCI-Express port */
295 PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
296 }, { /* end: all zeroes */ }
298 MODULE_DEVICE_TABLE(pci, port_pci_ids);
300 static const struct pci_error_handlers pcie_portdrv_err_handler = {
301 .error_detected = pcie_portdrv_error_detected,
302 .mmio_enabled = pcie_portdrv_mmio_enabled,
303 .slot_reset = pcie_portdrv_slot_reset,
304 .resume = pcie_portdrv_err_resume,
307 static struct pci_driver pcie_portdriver = {
309 .id_table = &port_pci_ids[0],
311 .probe = pcie_portdrv_probe,
312 .remove = pcie_portdrv_remove,
314 .err_handler = &pcie_portdrv_err_handler,
316 .driver.pm = PCIE_PORTDRV_PM_OPS,
319 static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d)
321 pr_notice("%s detected: will not use MSI for PCIe PME signaling\n",
323 pcie_pme_disable_msi();
327 static struct dmi_system_id __initdata pcie_portdrv_dmi_table[] = {
329 * Boxes that should not use MSI for PCIe PME signaling.
332 .callback = dmi_pcie_pme_disable_msi,
333 .ident = "MSI Wind U-100",
335 DMI_MATCH(DMI_SYS_VENDOR,
336 "MICRO-STAR INTERNATIONAL CO., LTD"),
337 DMI_MATCH(DMI_PRODUCT_NAME, "U-100"),
343 static int __init pcie_portdrv_init(void)
347 if (pcie_ports_disabled)
348 return pci_register_driver(&pcie_portdriver);
350 dmi_check_system(pcie_portdrv_dmi_table);
352 retval = pcie_port_bus_register();
354 printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
357 retval = pci_register_driver(&pcie_portdriver);
359 pcie_port_bus_unregister();
364 module_init(pcie_portdrv_init);