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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 int pcie_port_runtime_suspend(struct device *dev)
 97 {
 98         return to_pci_dev(dev)->bridge_d3 ? 0 : -EBUSY;
 99 }
100 
101 static int pcie_port_runtime_resume(struct device *dev)
102 {
103         return 0;
104 }
105 
106 static int pcie_port_runtime_idle(struct device *dev)
107 {
108         /*
109          * Assume the PCI core has set bridge_d3 whenever it thinks the port
110          * should be good to go to D3.  Everything else, including moving
111          * the port to D3, is handled by the PCI core.
112          */
113         return to_pci_dev(dev)->bridge_d3 ? 0 : -EBUSY;
114 }
115 
116 static const struct dev_pm_ops pcie_portdrv_pm_ops = {
117         .suspend        = pcie_port_device_suspend,
118         .resume         = pcie_port_device_resume,
119         .freeze         = pcie_port_device_suspend,
120         .thaw           = pcie_port_device_resume,
121         .poweroff       = pcie_port_device_suspend,
122         .restore        = pcie_port_device_resume,
123         .resume_noirq   = pcie_port_resume_noirq,
124         .runtime_suspend = pcie_port_runtime_suspend,
125         .runtime_resume = pcie_port_runtime_resume,
126         .runtime_idle   = pcie_port_runtime_idle,
127 };
128 
129 #define PCIE_PORTDRV_PM_OPS     (&pcie_portdrv_pm_ops)
130 
131 #else /* !PM */
132 
133 #define PCIE_PORTDRV_PM_OPS     NULL
134 #endif /* !PM */
135 
136 /*
137  * pcie_portdrv_probe - Probe PCI-Express port devices
138  * @dev: PCI-Express port device being probed
139  *
140  * If detected invokes the pcie_port_device_register() method for
141  * this port device.
142  *
143  */
144 static int pcie_portdrv_probe(struct pci_dev *dev,
145                                         const struct pci_device_id *id)
146 {
147         int status;
148 
149         if (!pci_is_pcie(dev) ||
150             ((pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) &&
151              (pci_pcie_type(dev) != PCI_EXP_TYPE_UPSTREAM) &&
152              (pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM)))
153                 return -ENODEV;
154 
155         status = pcie_port_device_register(dev);
156         if (status)
157                 return status;
158 
159         pci_save_state(dev);
160 
161         /*
162          * Prevent runtime PM if the port is advertising support for PCIe
163          * hotplug.  Otherwise the BIOS hotplug SMI code might not be able
164          * to enumerate devices behind this port properly (the port is
165          * powered down preventing all config space accesses to the
166          * subordinate devices).  We can't be sure for native PCIe hotplug
167          * either so prevent that as well.
168          */
169         if (!dev->is_hotplug_bridge) {
170                 /*
171                  * Keep the port resumed 100ms to make sure things like
172                  * config space accesses from userspace (lspci) will not
173                  * cause the port to repeatedly suspend and resume.
174                  */
175                 pm_runtime_set_autosuspend_delay(&dev->dev, 100);
176                 pm_runtime_use_autosuspend(&dev->dev);
177                 pm_runtime_mark_last_busy(&dev->dev);
178                 pm_runtime_put_autosuspend(&dev->dev);
179                 pm_runtime_allow(&dev->dev);
180         }
181 
182         return 0;
183 }
184 
185 static void pcie_portdrv_remove(struct pci_dev *dev)
186 {
187         if (!dev->is_hotplug_bridge) {
188                 pm_runtime_forbid(&dev->dev);
189                 pm_runtime_get_noresume(&dev->dev);
190                 pm_runtime_dont_use_autosuspend(&dev->dev);
191         }
192 
193         pcie_port_device_remove(dev);
194 }
195 
196 static int error_detected_iter(struct device *device, void *data)
197 {
198         struct pcie_device *pcie_device;
199         struct pcie_port_service_driver *driver;
200         struct aer_broadcast_data *result_data;
201         pci_ers_result_t status;
202 
203         result_data = (struct aer_broadcast_data *) data;
204 
205         if (device->bus == &pcie_port_bus_type && device->driver) {
206                 driver = to_service_driver(device->driver);
207                 if (!driver ||
208                         !driver->err_handler ||
209                         !driver->err_handler->error_detected)
210                         return 0;
211 
212                 pcie_device = to_pcie_device(device);
213 
214                 /* Forward error detected message to service drivers */
215                 status = driver->err_handler->error_detected(
216                         pcie_device->port,
217                         result_data->state);
218                 result_data->result =
219                         merge_result(result_data->result, status);
220         }
221 
222         return 0;
223 }
224 
225 static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
226                                         enum pci_channel_state error)
227 {
228         struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER};
229 
230         /* get true return value from &data */
231         device_for_each_child(&dev->dev, &data, error_detected_iter);
232         return data.result;
233 }
234 
235 static int mmio_enabled_iter(struct device *device, void *data)
236 {
237         struct pcie_device *pcie_device;
238         struct pcie_port_service_driver *driver;
239         pci_ers_result_t status, *result;
240 
241         result = (pci_ers_result_t *) data;
242 
243         if (device->bus == &pcie_port_bus_type && device->driver) {
244                 driver = to_service_driver(device->driver);
245                 if (driver &&
246                         driver->err_handler &&
247                         driver->err_handler->mmio_enabled) {
248                         pcie_device = to_pcie_device(device);
249 
250                         /* Forward error message to service drivers */
251                         status = driver->err_handler->mmio_enabled(
252                                         pcie_device->port);
253                         *result = merge_result(*result, status);
254                 }
255         }
256 
257         return 0;
258 }
259 
260 static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
261 {
262         pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
263 
264         /* get true return value from &status */
265         device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
266         return status;
267 }
268 
269 static int slot_reset_iter(struct device *device, void *data)
270 {
271         struct pcie_device *pcie_device;
272         struct pcie_port_service_driver *driver;
273         pci_ers_result_t status, *result;
274 
275         result = (pci_ers_result_t *) data;
276 
277         if (device->bus == &pcie_port_bus_type && device->driver) {
278                 driver = to_service_driver(device->driver);
279                 if (driver &&
280                         driver->err_handler &&
281                         driver->err_handler->slot_reset) {
282                         pcie_device = to_pcie_device(device);
283 
284                         /* Forward error message to service drivers */
285                         status = driver->err_handler->slot_reset(
286                                         pcie_device->port);
287                         *result = merge_result(*result, status);
288                 }
289         }
290 
291         return 0;
292 }
293 
294 static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
295 {
296         pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
297 
298         /* If fatal, restore cfg space for possible link reset at upstream */
299         if (dev->error_state == pci_channel_io_frozen) {
300                 dev->state_saved = true;
301                 pci_restore_state(dev);
302                 pcie_portdrv_restore_config(dev);
303                 pci_enable_pcie_error_reporting(dev);
304         }
305 
306         /* get true return value from &status */
307         device_for_each_child(&dev->dev, &status, slot_reset_iter);
308         return status;
309 }
310 
311 static int resume_iter(struct device *device, void *data)
312 {
313         struct pcie_device *pcie_device;
314         struct pcie_port_service_driver *driver;
315 
316         if (device->bus == &pcie_port_bus_type && device->driver) {
317                 driver = to_service_driver(device->driver);
318                 if (driver &&
319                         driver->err_handler &&
320                         driver->err_handler->resume) {
321                         pcie_device = to_pcie_device(device);
322 
323                         /* Forward error message to service drivers */
324                         driver->err_handler->resume(pcie_device->port);
325                 }
326         }
327 
328         return 0;
329 }
330 
331 static void pcie_portdrv_err_resume(struct pci_dev *dev)
332 {
333         device_for_each_child(&dev->dev, NULL, resume_iter);
334 }
335 
336 /*
337  * LINUX Device Driver Model
338  */
339 static const struct pci_device_id port_pci_ids[] = { {
340         /* handle any PCI-Express port */
341         PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
342         }, { /* end: all zeroes */ }
343 };
344 MODULE_DEVICE_TABLE(pci, port_pci_ids);
345 
346 static const struct pci_error_handlers pcie_portdrv_err_handler = {
347         .error_detected = pcie_portdrv_error_detected,
348         .mmio_enabled = pcie_portdrv_mmio_enabled,
349         .slot_reset = pcie_portdrv_slot_reset,
350         .resume = pcie_portdrv_err_resume,
351 };
352 
353 static struct pci_driver pcie_portdriver = {
354         .name           = "pcieport",
355         .id_table       = &port_pci_ids[0],
356 
357         .probe          = pcie_portdrv_probe,
358         .remove         = pcie_portdrv_remove,
359 
360         .err_handler    = &pcie_portdrv_err_handler,
361 
362         .driver.pm      = PCIE_PORTDRV_PM_OPS,
363 };
364 
365 static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d)
366 {
367         pr_notice("%s detected: will not use MSI for PCIe PME signaling\n",
368                   d->ident);
369         pcie_pme_disable_msi();
370         return 0;
371 }
372 
373 static struct dmi_system_id __initdata pcie_portdrv_dmi_table[] = {
374         /*
375          * Boxes that should not use MSI for PCIe PME signaling.
376          */
377         {
378          .callback = dmi_pcie_pme_disable_msi,
379          .ident = "MSI Wind U-100",
380          .matches = {
381                      DMI_MATCH(DMI_SYS_VENDOR,
382                                 "MICRO-STAR INTERNATIONAL CO., LTD"),
383                      DMI_MATCH(DMI_PRODUCT_NAME, "U-100"),
384                      },
385          },
386          {}
387 };
388 
389 static int __init pcie_portdrv_init(void)
390 {
391         int retval;
392 
393         if (pcie_ports_disabled)
394                 return pci_register_driver(&pcie_portdriver);
395 
396         dmi_check_system(pcie_portdrv_dmi_table);
397 
398         retval = pcie_port_bus_register();
399         if (retval) {
400                 printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
401                 goto out;
402         }
403         retval = pci_register_driver(&pcie_portdriver);
404         if (retval)
405                 pcie_port_bus_unregister();
406  out:
407         return retval;
408 }
409 
410 module_init(pcie_portdrv_init);
411 

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