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Linux/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/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>
 20 
 21 #include "portdrv.h"
 22 #include "aer/aerdrv.h"
 23 
 24 /*
 25  * Version Information
 26  */
 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");
 33 
 34 /* If this switch is set, PCIe port native services should not be enabled. */
 35 bool pcie_ports_disabled;
 36 
 37 /*
 38  * If this switch is set, ACPI _OSC will be used to determine whether or not to
 39  * enable PCIe port native services.
 40  */
 41 bool pcie_ports_auto = true;
 42 
 43 static int __init pcie_port_setup(char *str)
 44 {
 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;
 53         }
 54 
 55         return 1;
 56 }
 57 __setup("pcie_ports=", pcie_port_setup);
 58 
 59 /* global data */
 60 
 61 /**
 62  * pcie_clear_root_pme_status - Clear root port PME interrupt status.
 63  * @dev: PCIe root port or event collector.
 64  */
 65 void pcie_clear_root_pme_status(struct pci_dev *dev)
 66 {
 67         pcie_capability_set_dword(dev, PCI_EXP_RTSTA, PCI_EXP_RTSTA_PME);
 68 }
 69 
 70 static int pcie_portdrv_restore_config(struct pci_dev *dev)
 71 {
 72         int retval;
 73 
 74         retval = pci_enable_device(dev);
 75         if (retval)
 76                 return retval;
 77         pci_set_master(dev);
 78         return 0;
 79 }
 80 
 81 #ifdef CONFIG_PM
 82 static int pcie_port_resume_noirq(struct device *dev)
 83 {
 84         struct pci_dev *pdev = to_pci_dev(dev);
 85 
 86         /*
 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).
 90          */
 91         if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT)
 92                 pcie_clear_root_pme_status(pdev);
 93         return 0;
 94 }
 95 
 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,
104 };
105 
106 #define PCIE_PORTDRV_PM_OPS     (&pcie_portdrv_pm_ops)
107 
108 #else /* !PM */
109 
110 #define PCIE_PORTDRV_PM_OPS     NULL
111 #endif /* !PM */
112 
113 /*
114  * pcie_portdrv_probe - Probe PCI-Express port devices
115  * @dev: PCI-Express port device being probed
116  *
117  * If detected invokes the pcie_port_device_register() method for
118  * this port device.
119  *
120  */
121 static int pcie_portdrv_probe(struct pci_dev *dev,
122                                         const struct pci_device_id *id)
123 {
124         int status;
125 
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)))
130                 return -ENODEV;
131 
132         status = pcie_port_device_register(dev);
133         if (status)
134                 return status;
135 
136         pci_save_state(dev);
137         /*
138          * D3cold may not work properly on some PCIe port, so disable
139          * it by default.
140          */
141         dev->d3cold_allowed = false;
142         return 0;
143 }
144 
145 static void pcie_portdrv_remove(struct pci_dev *dev)
146 {
147         pcie_port_device_remove(dev);
148 }
149 
150 static int error_detected_iter(struct device *device, void *data)
151 {
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;
156 
157         result_data = (struct aer_broadcast_data *) data;
158 
159         if (device->bus == &pcie_port_bus_type && device->driver) {
160                 driver = to_service_driver(device->driver);
161                 if (!driver ||
162                         !driver->err_handler ||
163                         !driver->err_handler->error_detected)
164                         return 0;
165 
166                 pcie_device = to_pcie_device(device);
167 
168                 /* Forward error detected message to service drivers */
169                 status = driver->err_handler->error_detected(
170                         pcie_device->port,
171                         result_data->state);
172                 result_data->result =
173                         merge_result(result_data->result, status);
174         }
175 
176         return 0;
177 }
178 
179 static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
180                                         enum pci_channel_state error)
181 {
182         struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER};
183 
184         /* get true return value from &data */
185         device_for_each_child(&dev->dev, &data, error_detected_iter);
186         return data.result;
187 }
188 
189 static int mmio_enabled_iter(struct device *device, void *data)
190 {
191         struct pcie_device *pcie_device;
192         struct pcie_port_service_driver *driver;
193         pci_ers_result_t status, *result;
194 
195         result = (pci_ers_result_t *) data;
196 
197         if (device->bus == &pcie_port_bus_type && device->driver) {
198                 driver = to_service_driver(device->driver);
199                 if (driver &&
200                         driver->err_handler &&
201                         driver->err_handler->mmio_enabled) {
202                         pcie_device = to_pcie_device(device);
203 
204                         /* Forward error message to service drivers */
205                         status = driver->err_handler->mmio_enabled(
206                                         pcie_device->port);
207                         *result = merge_result(*result, status);
208                 }
209         }
210 
211         return 0;
212 }
213 
214 static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
215 {
216         pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
217 
218         /* get true return value from &status */
219         device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
220         return status;
221 }
222 
223 static int slot_reset_iter(struct device *device, void *data)
224 {
225         struct pcie_device *pcie_device;
226         struct pcie_port_service_driver *driver;
227         pci_ers_result_t status, *result;
228 
229         result = (pci_ers_result_t *) data;
230 
231         if (device->bus == &pcie_port_bus_type && device->driver) {
232                 driver = to_service_driver(device->driver);
233                 if (driver &&
234                         driver->err_handler &&
235                         driver->err_handler->slot_reset) {
236                         pcie_device = to_pcie_device(device);
237 
238                         /* Forward error message to service drivers */
239                         status = driver->err_handler->slot_reset(
240                                         pcie_device->port);
241                         *result = merge_result(*result, status);
242                 }
243         }
244 
245         return 0;
246 }
247 
248 static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
249 {
250         pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
251 
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);
258         }
259 
260         /* get true return value from &status */
261         device_for_each_child(&dev->dev, &status, slot_reset_iter);
262         return status;
263 }
264 
265 static int resume_iter(struct device *device, void *data)
266 {
267         struct pcie_device *pcie_device;
268         struct pcie_port_service_driver *driver;
269 
270         if (device->bus == &pcie_port_bus_type && device->driver) {
271                 driver = to_service_driver(device->driver);
272                 if (driver &&
273                         driver->err_handler &&
274                         driver->err_handler->resume) {
275                         pcie_device = to_pcie_device(device);
276 
277                         /* Forward error message to service drivers */
278                         driver->err_handler->resume(pcie_device->port);
279                 }
280         }
281 
282         return 0;
283 }
284 
285 static void pcie_portdrv_err_resume(struct pci_dev *dev)
286 {
287         device_for_each_child(&dev->dev, NULL, resume_iter);
288 }
289 
290 /*
291  * LINUX Device Driver Model
292  */
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 */ }
297 };
298 MODULE_DEVICE_TABLE(pci, port_pci_ids);
299 
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,
305 };
306 
307 static struct pci_driver pcie_portdriver = {
308         .name           = "pcieport",
309         .id_table       = &port_pci_ids[0],
310 
311         .probe          = pcie_portdrv_probe,
312         .remove         = pcie_portdrv_remove,
313 
314         .err_handler    = &pcie_portdrv_err_handler,
315 
316         .driver.pm      = PCIE_PORTDRV_PM_OPS,
317 };
318 
319 static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d)
320 {
321         pr_notice("%s detected: will not use MSI for PCIe PME signaling\n",
322                   d->ident);
323         pcie_pme_disable_msi();
324         return 0;
325 }
326 
327 static struct dmi_system_id __initdata pcie_portdrv_dmi_table[] = {
328         /*
329          * Boxes that should not use MSI for PCIe PME signaling.
330          */
331         {
332          .callback = dmi_pcie_pme_disable_msi,
333          .ident = "MSI Wind U-100",
334          .matches = {
335                      DMI_MATCH(DMI_SYS_VENDOR,
336                                 "MICRO-STAR INTERNATIONAL CO., LTD"),
337                      DMI_MATCH(DMI_PRODUCT_NAME, "U-100"),
338                      },
339          },
340          {}
341 };
342 
343 static int __init pcie_portdrv_init(void)
344 {
345         int retval;
346 
347         if (pcie_ports_disabled)
348                 return pci_register_driver(&pcie_portdriver);
349 
350         dmi_check_system(pcie_portdrv_dmi_table);
351 
352         retval = pcie_port_bus_register();
353         if (retval) {
354                 printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
355                 goto out;
356         }
357         retval = pci_register_driver(&pcie_portdriver);
358         if (retval)
359                 pcie_port_bus_unregister();
360  out:
361         return retval;
362 }
363 
364 module_init(pcie_portdrv_init);
365 

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