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 #ifdef CONFIG_PM_RUNTIME
99 unsigned int d3cold_delay;
102 static int pci_dev_d3cold_info(struct pci_dev *pdev, void *data)
104 struct d3cold_info *info = data;
106 info->d3cold_delay = max_t(unsigned int, pdev->d3cold_delay,
109 info->no_d3cold = true;
113 static int pcie_port_runtime_suspend(struct device *dev)
115 struct pci_dev *pdev = to_pci_dev(dev);
116 struct d3cold_info d3cold_info = {
118 .d3cold_delay = PCI_PM_D3_WAIT,
122 * If any subordinate device disable D3cold, we should not put
123 * the port into D3cold. The D3cold delay of port should be
124 * the max of that of all subordinate devices.
126 pci_walk_bus(pdev->subordinate, pci_dev_d3cold_info, &d3cold_info);
127 pdev->no_d3cold = d3cold_info.no_d3cold;
128 pdev->d3cold_delay = d3cold_info.d3cold_delay;
132 static int pcie_port_runtime_resume(struct device *dev)
137 static int pcie_port_runtime_idle(struct device *dev)
139 /* Delay for a short while to prevent too frequent suspend/resume */
140 pm_schedule_suspend(dev, 10);
144 #define pcie_port_runtime_suspend NULL
145 #define pcie_port_runtime_resume NULL
146 #define pcie_port_runtime_idle NULL
149 static const struct dev_pm_ops pcie_portdrv_pm_ops = {
150 .suspend = pcie_port_device_suspend,
151 .resume = pcie_port_device_resume,
152 .freeze = pcie_port_device_suspend,
153 .thaw = pcie_port_device_resume,
154 .poweroff = pcie_port_device_suspend,
155 .restore = pcie_port_device_resume,
156 .resume_noirq = pcie_port_resume_noirq,
157 .runtime_suspend = pcie_port_runtime_suspend,
158 .runtime_resume = pcie_port_runtime_resume,
159 .runtime_idle = pcie_port_runtime_idle,
162 #define PCIE_PORTDRV_PM_OPS (&pcie_portdrv_pm_ops)
166 #define PCIE_PORTDRV_PM_OPS NULL
170 * PCIe port runtime suspend is broken for some chipsets, so use a
171 * black list to disable runtime PM for these chipsets.
173 static const struct pci_device_id port_runtime_pm_black_list[] = {
174 { /* end: all zeroes */ }
178 * pcie_portdrv_probe - Probe PCI-Express port devices
179 * @dev: PCI-Express port device being probed
181 * If detected invokes the pcie_port_device_register() method for
185 static int pcie_portdrv_probe(struct pci_dev *dev,
186 const struct pci_device_id *id)
190 if (!pci_is_pcie(dev) ||
191 ((pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) &&
192 (pci_pcie_type(dev) != PCI_EXP_TYPE_UPSTREAM) &&
193 (pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM)))
196 if (!dev->irq && dev->pin) {
197 dev_warn(&dev->dev, "device [%04x:%04x] has invalid IRQ; "
198 "check vendor BIOS\n", dev->vendor, dev->device);
200 status = pcie_port_device_register(dev);
206 * D3cold may not work properly on some PCIe port, so disable
209 dev->d3cold_allowed = false;
210 if (!pci_match_id(port_runtime_pm_black_list, dev))
211 pm_runtime_put_noidle(&dev->dev);
216 static void pcie_portdrv_remove(struct pci_dev *dev)
218 if (!pci_match_id(port_runtime_pm_black_list, dev))
219 pm_runtime_get_noresume(&dev->dev);
220 pcie_port_device_remove(dev);
221 pci_disable_device(dev);
224 static int error_detected_iter(struct device *device, void *data)
226 struct pcie_device *pcie_device;
227 struct pcie_port_service_driver *driver;
228 struct aer_broadcast_data *result_data;
229 pci_ers_result_t status;
231 result_data = (struct aer_broadcast_data *) data;
233 if (device->bus == &pcie_port_bus_type && device->driver) {
234 driver = to_service_driver(device->driver);
236 !driver->err_handler ||
237 !driver->err_handler->error_detected)
240 pcie_device = to_pcie_device(device);
242 /* Forward error detected message to service drivers */
243 status = driver->err_handler->error_detected(
246 result_data->result =
247 merge_result(result_data->result, status);
253 static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
254 enum pci_channel_state error)
256 struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER};
260 ret = device_for_each_child(&dev->dev, &data, error_detected_iter);
265 static int mmio_enabled_iter(struct device *device, void *data)
267 struct pcie_device *pcie_device;
268 struct pcie_port_service_driver *driver;
269 pci_ers_result_t status, *result;
271 result = (pci_ers_result_t *) data;
273 if (device->bus == &pcie_port_bus_type && device->driver) {
274 driver = to_service_driver(device->driver);
276 driver->err_handler &&
277 driver->err_handler->mmio_enabled) {
278 pcie_device = to_pcie_device(device);
280 /* Forward error message to service drivers */
281 status = driver->err_handler->mmio_enabled(
283 *result = merge_result(*result, status);
290 static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
292 pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
295 /* get true return value from &status */
296 retval = device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
300 static int slot_reset_iter(struct device *device, void *data)
302 struct pcie_device *pcie_device;
303 struct pcie_port_service_driver *driver;
304 pci_ers_result_t status, *result;
306 result = (pci_ers_result_t *) data;
308 if (device->bus == &pcie_port_bus_type && device->driver) {
309 driver = to_service_driver(device->driver);
311 driver->err_handler &&
312 driver->err_handler->slot_reset) {
313 pcie_device = to_pcie_device(device);
315 /* Forward error message to service drivers */
316 status = driver->err_handler->slot_reset(
318 *result = merge_result(*result, status);
325 static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
327 pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
330 /* If fatal, restore cfg space for possible link reset at upstream */
331 if (dev->error_state == pci_channel_io_frozen) {
332 dev->state_saved = true;
333 pci_restore_state(dev);
334 pcie_portdrv_restore_config(dev);
335 pci_enable_pcie_error_reporting(dev);
338 /* get true return value from &status */
339 retval = device_for_each_child(&dev->dev, &status, slot_reset_iter);
344 static int resume_iter(struct device *device, void *data)
346 struct pcie_device *pcie_device;
347 struct pcie_port_service_driver *driver;
349 if (device->bus == &pcie_port_bus_type && device->driver) {
350 driver = to_service_driver(device->driver);
352 driver->err_handler &&
353 driver->err_handler->resume) {
354 pcie_device = to_pcie_device(device);
356 /* Forward error message to service drivers */
357 driver->err_handler->resume(pcie_device->port);
364 static void pcie_portdrv_err_resume(struct pci_dev *dev)
367 /* nothing to do with error value, if it ever happens */
368 retval = device_for_each_child(&dev->dev, NULL, resume_iter);
372 * LINUX Device Driver Model
374 static const struct pci_device_id port_pci_ids[] = { {
375 /* handle any PCI-Express port */
376 PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
377 }, { /* end: all zeroes */ }
379 MODULE_DEVICE_TABLE(pci, port_pci_ids);
381 static const struct pci_error_handlers pcie_portdrv_err_handler = {
382 .error_detected = pcie_portdrv_error_detected,
383 .mmio_enabled = pcie_portdrv_mmio_enabled,
384 .slot_reset = pcie_portdrv_slot_reset,
385 .resume = pcie_portdrv_err_resume,
388 static struct pci_driver pcie_portdriver = {
390 .id_table = &port_pci_ids[0],
392 .probe = pcie_portdrv_probe,
393 .remove = pcie_portdrv_remove,
395 .err_handler = &pcie_portdrv_err_handler,
397 .driver.pm = PCIE_PORTDRV_PM_OPS,
400 static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d)
402 pr_notice("%s detected: will not use MSI for PCIe PME signaling\n",
404 pcie_pme_disable_msi();
408 static struct dmi_system_id __initdata pcie_portdrv_dmi_table[] = {
410 * Boxes that should not use MSI for PCIe PME signaling.
413 .callback = dmi_pcie_pme_disable_msi,
414 .ident = "MSI Wind U-100",
416 DMI_MATCH(DMI_SYS_VENDOR,
417 "MICRO-STAR INTERNATIONAL CO., LTD"),
418 DMI_MATCH(DMI_PRODUCT_NAME, "U-100"),
424 static int __init pcie_portdrv_init(void)
428 if (pcie_ports_disabled)
429 return pci_register_driver(&pcie_portdriver);
431 dmi_check_system(pcie_portdrv_dmi_table);
433 retval = pcie_port_bus_register();
435 printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
438 retval = pci_register_driver(&pcie_portdriver);
440 pcie_port_bus_unregister();
445 module_init(pcie_portdrv_init);