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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 #ifdef CONFIG_PM_RUNTIME
 97 struct d3cold_info {
 98         bool no_d3cold;
 99         unsigned int d3cold_delay;
100 };
101 
102 static int pci_dev_d3cold_info(struct pci_dev *pdev, void *data)
103 {
104         struct d3cold_info *info = data;
105 
106         info->d3cold_delay = max_t(unsigned int, pdev->d3cold_delay,
107                                    info->d3cold_delay);
108         if (pdev->no_d3cold)
109                 info->no_d3cold = true;
110         return 0;
111 }
112 
113 static int pcie_port_runtime_suspend(struct device *dev)
114 {
115         struct pci_dev *pdev = to_pci_dev(dev);
116         struct d3cold_info d3cold_info = {
117                 .no_d3cold      = false,
118                 .d3cold_delay   = PCI_PM_D3_WAIT,
119         };
120 
121         /*
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.
125          */
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;
129         return 0;
130 }
131 
132 static int pcie_port_runtime_resume(struct device *dev)
133 {
134         return 0;
135 }
136 
137 static int pci_dev_pme_poll(struct pci_dev *pdev, void *data)
138 {
139         bool *pme_poll = data;
140 
141         if (pdev->pme_poll)
142                 *pme_poll = true;
143         return 0;
144 }
145 
146 static int pcie_port_runtime_idle(struct device *dev)
147 {
148         struct pci_dev *pdev = to_pci_dev(dev);
149         bool pme_poll = false;
150 
151         /*
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.
154          */
155         pci_walk_bus(pdev->subordinate, pci_dev_pme_poll, &pme_poll);
156         /* Delay for a short while to prevent too frequent suspend/resume */
157         if (!pme_poll)
158                 pm_schedule_suspend(dev, 10);
159         return -EBUSY;
160 }
161 #else
162 #define pcie_port_runtime_suspend       NULL
163 #define pcie_port_runtime_resume        NULL
164 #define pcie_port_runtime_idle          NULL
165 #endif
166 
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,
178 };
179 
180 #define PCIE_PORTDRV_PM_OPS     (&pcie_portdrv_pm_ops)
181 
182 #else /* !PM */
183 
184 #define PCIE_PORTDRV_PM_OPS     NULL
185 #endif /* !PM */
186 
187 /*
188  * pcie_portdrv_probe - Probe PCI-Express port devices
189  * @dev: PCI-Express port device being probed
190  *
191  * If detected invokes the pcie_port_device_register() method for
192  * this port device.
193  *
194  */
195 static int pcie_portdrv_probe(struct pci_dev *dev,
196                                         const struct pci_device_id *id)
197 {
198         int status;
199 
200         if (!pci_is_pcie(dev) ||
201             ((pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) &&
202              (pci_pcie_type(dev) != PCI_EXP_TYPE_UPSTREAM) &&
203              (pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM)))
204                 return -ENODEV;
205 
206         if (!dev->irq && dev->pin) {
207                 dev_warn(&dev->dev, "device [%04x:%04x] has invalid IRQ; "
208                          "check vendor BIOS\n", dev->vendor, dev->device);
209         }
210         status = pcie_port_device_register(dev);
211         if (status)
212                 return status;
213 
214         pci_save_state(dev);
215         /*
216          * D3cold may not work properly on some PCIe port, so disable
217          * it by default.
218          */
219         dev->d3cold_allowed = false;
220         return 0;
221 }
222 
223 static void pcie_portdrv_remove(struct pci_dev *dev)
224 {
225         pcie_port_device_remove(dev);
226 }
227 
228 static int error_detected_iter(struct device *device, void *data)
229 {
230         struct pcie_device *pcie_device;
231         struct pcie_port_service_driver *driver;
232         struct aer_broadcast_data *result_data;
233         pci_ers_result_t status;
234 
235         result_data = (struct aer_broadcast_data *) data;
236 
237         if (device->bus == &pcie_port_bus_type && device->driver) {
238                 driver = to_service_driver(device->driver);
239                 if (!driver ||
240                         !driver->err_handler ||
241                         !driver->err_handler->error_detected)
242                         return 0;
243 
244                 pcie_device = to_pcie_device(device);
245 
246                 /* Forward error detected message to service drivers */
247                 status = driver->err_handler->error_detected(
248                         pcie_device->port,
249                         result_data->state);
250                 result_data->result =
251                         merge_result(result_data->result, status);
252         }
253 
254         return 0;
255 }
256 
257 static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
258                                         enum pci_channel_state error)
259 {
260         struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER};
261 
262         /* get true return value from &data */
263         device_for_each_child(&dev->dev, &data, error_detected_iter);
264         return data.result;
265 }
266 
267 static int mmio_enabled_iter(struct device *device, void *data)
268 {
269         struct pcie_device *pcie_device;
270         struct pcie_port_service_driver *driver;
271         pci_ers_result_t status, *result;
272 
273         result = (pci_ers_result_t *) data;
274 
275         if (device->bus == &pcie_port_bus_type && device->driver) {
276                 driver = to_service_driver(device->driver);
277                 if (driver &&
278                         driver->err_handler &&
279                         driver->err_handler->mmio_enabled) {
280                         pcie_device = to_pcie_device(device);
281 
282                         /* Forward error message to service drivers */
283                         status = driver->err_handler->mmio_enabled(
284                                         pcie_device->port);
285                         *result = merge_result(*result, status);
286                 }
287         }
288 
289         return 0;
290 }
291 
292 static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
293 {
294         pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
295 
296         /* get true return value from &status */
297         device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
298         return status;
299 }
300 
301 static int slot_reset_iter(struct device *device, void *data)
302 {
303         struct pcie_device *pcie_device;
304         struct pcie_port_service_driver *driver;
305         pci_ers_result_t status, *result;
306 
307         result = (pci_ers_result_t *) data;
308 
309         if (device->bus == &pcie_port_bus_type && device->driver) {
310                 driver = to_service_driver(device->driver);
311                 if (driver &&
312                         driver->err_handler &&
313                         driver->err_handler->slot_reset) {
314                         pcie_device = to_pcie_device(device);
315 
316                         /* Forward error message to service drivers */
317                         status = driver->err_handler->slot_reset(
318                                         pcie_device->port);
319                         *result = merge_result(*result, status);
320                 }
321         }
322 
323         return 0;
324 }
325 
326 static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
327 {
328         pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
329 
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);
336         }
337 
338         /* get true return value from &status */
339         device_for_each_child(&dev->dev, &status, slot_reset_iter);
340         return status;
341 }
342 
343 static int resume_iter(struct device *device, void *data)
344 {
345         struct pcie_device *pcie_device;
346         struct pcie_port_service_driver *driver;
347 
348         if (device->bus == &pcie_port_bus_type && device->driver) {
349                 driver = to_service_driver(device->driver);
350                 if (driver &&
351                         driver->err_handler &&
352                         driver->err_handler->resume) {
353                         pcie_device = to_pcie_device(device);
354 
355                         /* Forward error message to service drivers */
356                         driver->err_handler->resume(pcie_device->port);
357                 }
358         }
359 
360         return 0;
361 }
362 
363 static void pcie_portdrv_err_resume(struct pci_dev *dev)
364 {
365         device_for_each_child(&dev->dev, NULL, resume_iter);
366 }
367 
368 /*
369  * LINUX Device Driver Model
370  */
371 static const struct pci_device_id port_pci_ids[] = { {
372         /* handle any PCI-Express port */
373         PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
374         }, { /* end: all zeroes */ }
375 };
376 MODULE_DEVICE_TABLE(pci, port_pci_ids);
377 
378 static const struct pci_error_handlers pcie_portdrv_err_handler = {
379         .error_detected = pcie_portdrv_error_detected,
380         .mmio_enabled = pcie_portdrv_mmio_enabled,
381         .slot_reset = pcie_portdrv_slot_reset,
382         .resume = pcie_portdrv_err_resume,
383 };
384 
385 static struct pci_driver pcie_portdriver = {
386         .name           = "pcieport",
387         .id_table       = &port_pci_ids[0],
388 
389         .probe          = pcie_portdrv_probe,
390         .remove         = pcie_portdrv_remove,
391 
392         .err_handler    = &pcie_portdrv_err_handler,
393 
394         .driver.pm      = PCIE_PORTDRV_PM_OPS,
395 };
396 
397 static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d)
398 {
399         pr_notice("%s detected: will not use MSI for PCIe PME signaling\n",
400                         d->ident);
401         pcie_pme_disable_msi();
402         return 0;
403 }
404 
405 static struct dmi_system_id __initdata pcie_portdrv_dmi_table[] = {
406         /*
407          * Boxes that should not use MSI for PCIe PME signaling.
408          */
409         {
410          .callback = dmi_pcie_pme_disable_msi,
411          .ident = "MSI Wind U-100",
412          .matches = {
413                      DMI_MATCH(DMI_SYS_VENDOR,
414                                 "MICRO-STAR INTERNATIONAL CO., LTD"),
415                      DMI_MATCH(DMI_PRODUCT_NAME, "U-100"),
416                      },
417          },
418          {}
419 };
420 
421 static int __init pcie_portdrv_init(void)
422 {
423         int retval;
424 
425         if (pcie_ports_disabled)
426                 return pci_register_driver(&pcie_portdriver);
427 
428         dmi_check_system(pcie_portdrv_dmi_table);
429 
430         retval = pcie_port_bus_register();
431         if (retval) {
432                 printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
433                 goto out;
434         }
435         retval = pci_register_driver(&pcie_portdriver);
436         if (retval)
437                 pcie_port_bus_unregister();
438  out:
439         return retval;
440 }
441 
442 module_init(pcie_portdrv_init);
443 

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