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 pci_dev_pme_poll(struct pci_dev *pdev, void *data)
139 bool *pme_poll = data;
146 static int pcie_port_runtime_idle(struct device *dev)
148 struct pci_dev *pdev = to_pci_dev(dev);
149 bool pme_poll = false;
152 * If any subordinate device needs pme poll, we should keep
153 * the port in D0, because we need port in D0 to poll it.
155 pci_walk_bus(pdev->subordinate, pci_dev_pme_poll, &pme_poll);
156 /* Delay for a short while to prevent too frequent suspend/resume */
158 pm_schedule_suspend(dev, 10);
162 #define pcie_port_runtime_suspend NULL
163 #define pcie_port_runtime_resume NULL
164 #define pcie_port_runtime_idle NULL
167 static const struct dev_pm_ops pcie_portdrv_pm_ops = {
168 .suspend = pcie_port_device_suspend,
169 .resume = pcie_port_device_resume,
170 .freeze = pcie_port_device_suspend,
171 .thaw = pcie_port_device_resume,
172 .poweroff = pcie_port_device_suspend,
173 .restore = pcie_port_device_resume,
174 .resume_noirq = pcie_port_resume_noirq,
175 .runtime_suspend = pcie_port_runtime_suspend,
176 .runtime_resume = pcie_port_runtime_resume,
177 .runtime_idle = pcie_port_runtime_idle,
180 #define PCIE_PORTDRV_PM_OPS (&pcie_portdrv_pm_ops)
184 #define PCIE_PORTDRV_PM_OPS NULL
188 * PCIe port runtime suspend is broken for some chipsets, so use a
189 * black list to disable runtime PM for these chipsets.
191 static const struct pci_device_id port_runtime_pm_black_list[] = {
192 { /* end: all zeroes */ }
196 * pcie_portdrv_probe - Probe PCI-Express port devices
197 * @dev: PCI-Express port device being probed
199 * If detected invokes the pcie_port_device_register() method for
203 static int pcie_portdrv_probe(struct pci_dev *dev,
204 const struct pci_device_id *id)
208 if (!pci_is_pcie(dev) ||
209 ((pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) &&
210 (pci_pcie_type(dev) != PCI_EXP_TYPE_UPSTREAM) &&
211 (pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM)))
214 if (!dev->irq && dev->pin) {
215 dev_warn(&dev->dev, "device [%04x:%04x] has invalid IRQ; "
216 "check vendor BIOS\n", dev->vendor, dev->device);
218 status = pcie_port_device_register(dev);
224 * D3cold may not work properly on some PCIe port, so disable
227 dev->d3cold_allowed = false;
228 if (!pci_match_id(port_runtime_pm_black_list, dev))
229 pm_runtime_put_noidle(&dev->dev);
234 static void pcie_portdrv_remove(struct pci_dev *dev)
236 if (!pci_match_id(port_runtime_pm_black_list, dev))
237 pm_runtime_get_noresume(&dev->dev);
238 pcie_port_device_remove(dev);
239 pci_disable_device(dev);
242 static int error_detected_iter(struct device *device, void *data)
244 struct pcie_device *pcie_device;
245 struct pcie_port_service_driver *driver;
246 struct aer_broadcast_data *result_data;
247 pci_ers_result_t status;
249 result_data = (struct aer_broadcast_data *) data;
251 if (device->bus == &pcie_port_bus_type && device->driver) {
252 driver = to_service_driver(device->driver);
254 !driver->err_handler ||
255 !driver->err_handler->error_detected)
258 pcie_device = to_pcie_device(device);
260 /* Forward error detected message to service drivers */
261 status = driver->err_handler->error_detected(
264 result_data->result =
265 merge_result(result_data->result, status);
271 static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
272 enum pci_channel_state error)
274 struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER};
278 ret = device_for_each_child(&dev->dev, &data, error_detected_iter);
283 static int mmio_enabled_iter(struct device *device, void *data)
285 struct pcie_device *pcie_device;
286 struct pcie_port_service_driver *driver;
287 pci_ers_result_t status, *result;
289 result = (pci_ers_result_t *) data;
291 if (device->bus == &pcie_port_bus_type && device->driver) {
292 driver = to_service_driver(device->driver);
294 driver->err_handler &&
295 driver->err_handler->mmio_enabled) {
296 pcie_device = to_pcie_device(device);
298 /* Forward error message to service drivers */
299 status = driver->err_handler->mmio_enabled(
301 *result = merge_result(*result, status);
308 static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
310 pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
313 /* get true return value from &status */
314 retval = device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
318 static int slot_reset_iter(struct device *device, void *data)
320 struct pcie_device *pcie_device;
321 struct pcie_port_service_driver *driver;
322 pci_ers_result_t status, *result;
324 result = (pci_ers_result_t *) data;
326 if (device->bus == &pcie_port_bus_type && device->driver) {
327 driver = to_service_driver(device->driver);
329 driver->err_handler &&
330 driver->err_handler->slot_reset) {
331 pcie_device = to_pcie_device(device);
333 /* Forward error message to service drivers */
334 status = driver->err_handler->slot_reset(
336 *result = merge_result(*result, status);
343 static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
345 pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
348 /* If fatal, restore cfg space for possible link reset at upstream */
349 if (dev->error_state == pci_channel_io_frozen) {
350 dev->state_saved = true;
351 pci_restore_state(dev);
352 pcie_portdrv_restore_config(dev);
353 pci_enable_pcie_error_reporting(dev);
356 /* get true return value from &status */
357 retval = device_for_each_child(&dev->dev, &status, slot_reset_iter);
362 static int resume_iter(struct device *device, void *data)
364 struct pcie_device *pcie_device;
365 struct pcie_port_service_driver *driver;
367 if (device->bus == &pcie_port_bus_type && device->driver) {
368 driver = to_service_driver(device->driver);
370 driver->err_handler &&
371 driver->err_handler->resume) {
372 pcie_device = to_pcie_device(device);
374 /* Forward error message to service drivers */
375 driver->err_handler->resume(pcie_device->port);
382 static void pcie_portdrv_err_resume(struct pci_dev *dev)
385 /* nothing to do with error value, if it ever happens */
386 retval = device_for_each_child(&dev->dev, NULL, resume_iter);
390 * LINUX Device Driver Model
392 static const struct pci_device_id port_pci_ids[] = { {
393 /* handle any PCI-Express port */
394 PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
395 }, { /* end: all zeroes */ }
397 MODULE_DEVICE_TABLE(pci, port_pci_ids);
399 static const struct pci_error_handlers pcie_portdrv_err_handler = {
400 .error_detected = pcie_portdrv_error_detected,
401 .mmio_enabled = pcie_portdrv_mmio_enabled,
402 .slot_reset = pcie_portdrv_slot_reset,
403 .resume = pcie_portdrv_err_resume,
406 static struct pci_driver pcie_portdriver = {
408 .id_table = &port_pci_ids[0],
410 .probe = pcie_portdrv_probe,
411 .remove = pcie_portdrv_remove,
413 .err_handler = &pcie_portdrv_err_handler,
415 .driver.pm = PCIE_PORTDRV_PM_OPS,
418 static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d)
420 pr_notice("%s detected: will not use MSI for PCIe PME signaling\n",
422 pcie_pme_disable_msi();
426 static struct dmi_system_id __initdata pcie_portdrv_dmi_table[] = {
428 * Boxes that should not use MSI for PCIe PME signaling.
431 .callback = dmi_pcie_pme_disable_msi,
432 .ident = "MSI Wind U-100",
434 DMI_MATCH(DMI_SYS_VENDOR,
435 "MICRO-STAR INTERNATIONAL CO., LTD"),
436 DMI_MATCH(DMI_PRODUCT_NAME, "U-100"),
442 static int __init pcie_portdrv_init(void)
446 if (pcie_ports_disabled)
447 return pci_register_driver(&pcie_portdriver);
449 dmi_check_system(pcie_portdrv_dmi_table);
451 retval = pcie_port_bus_register();
453 printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
456 retval = pci_register_driver(&pcie_portdriver);
458 pcie_port_bus_unregister();
463 module_init(pcie_portdrv_init);