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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  * Author:      Tom Nguyen <tom.l.nguyen@intel.com>
  5  * Version:     v1.0
  6  *
  7  * Copyright (C) 2004 Intel
  8  * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
  9  */
 10 
 11 #include <linux/pci.h>
 12 #include <linux/kernel.h>
 13 #include <linux/errno.h>
 14 #include <linux/pm.h>
 15 #include <linux/pm_runtime.h>
 16 #include <linux/init.h>
 17 #include <linux/pcieport_if.h>
 18 #include <linux/aer.h>
 19 #include <linux/dmi.h>
 20 #include <linux/pci-aspm.h>
 21 
 22 #include "portdrv.h"
 23 #include "aer/aerdrv.h"
 24 
 25 /* If this switch is set, PCIe port native services should not be enabled. */
 26 bool pcie_ports_disabled;
 27 
 28 /*
 29  * If this switch is set, ACPI _OSC will be used to determine whether or not to
 30  * enable PCIe port native services.
 31  */
 32 bool pcie_ports_auto = true;
 33 
 34 static int __init pcie_port_setup(char *str)
 35 {
 36         if (!strncmp(str, "compat", 6)) {
 37                 pcie_ports_disabled = true;
 38         } else if (!strncmp(str, "native", 6)) {
 39                 pcie_ports_disabled = false;
 40                 pcie_ports_auto = false;
 41         } else if (!strncmp(str, "auto", 4)) {
 42                 pcie_ports_disabled = false;
 43                 pcie_ports_auto = true;
 44         }
 45 
 46         return 1;
 47 }
 48 __setup("pcie_ports=", pcie_port_setup);
 49 
 50 /* global data */
 51 
 52 /**
 53  * pcie_clear_root_pme_status - Clear root port PME interrupt status.
 54  * @dev: PCIe root port or event collector.
 55  */
 56 void pcie_clear_root_pme_status(struct pci_dev *dev)
 57 {
 58         pcie_capability_set_dword(dev, PCI_EXP_RTSTA, PCI_EXP_RTSTA_PME);
 59 }
 60 
 61 static int pcie_portdrv_restore_config(struct pci_dev *dev)
 62 {
 63         int retval;
 64 
 65         retval = pci_enable_device(dev);
 66         if (retval)
 67                 return retval;
 68         pci_set_master(dev);
 69         return 0;
 70 }
 71 
 72 #ifdef CONFIG_PM
 73 static int pcie_port_resume_noirq(struct device *dev)
 74 {
 75         struct pci_dev *pdev = to_pci_dev(dev);
 76 
 77         /*
 78          * Some BIOSes forget to clear Root PME Status bits after system wakeup
 79          * which breaks ACPI-based runtime wakeup on PCI Express, so clear those
 80          * bits now just in case (shouldn't hurt).
 81          */
 82         if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT)
 83                 pcie_clear_root_pme_status(pdev);
 84         return 0;
 85 }
 86 
 87 static int pcie_port_runtime_suspend(struct device *dev)
 88 {
 89         return to_pci_dev(dev)->bridge_d3 ? 0 : -EBUSY;
 90 }
 91 
 92 static int pcie_port_runtime_resume(struct device *dev)
 93 {
 94         return 0;
 95 }
 96 
 97 static int pcie_port_runtime_idle(struct device *dev)
 98 {
 99         /*
100          * Assume the PCI core has set bridge_d3 whenever it thinks the port
101          * should be good to go to D3.  Everything else, including moving
102          * the port to D3, is handled by the PCI core.
103          */
104         return to_pci_dev(dev)->bridge_d3 ? 0 : -EBUSY;
105 }
106 
107 static const struct dev_pm_ops pcie_portdrv_pm_ops = {
108         .suspend        = pcie_port_device_suspend,
109         .resume         = pcie_port_device_resume,
110         .freeze         = pcie_port_device_suspend,
111         .thaw           = pcie_port_device_resume,
112         .poweroff       = pcie_port_device_suspend,
113         .restore        = pcie_port_device_resume,
114         .resume_noirq   = pcie_port_resume_noirq,
115         .runtime_suspend = pcie_port_runtime_suspend,
116         .runtime_resume = pcie_port_runtime_resume,
117         .runtime_idle   = pcie_port_runtime_idle,
118 };
119 
120 #define PCIE_PORTDRV_PM_OPS     (&pcie_portdrv_pm_ops)
121 
122 #else /* !PM */
123 
124 #define PCIE_PORTDRV_PM_OPS     NULL
125 #endif /* !PM */
126 
127 /*
128  * pcie_portdrv_probe - Probe PCI-Express port devices
129  * @dev: PCI-Express port device being probed
130  *
131  * If detected invokes the pcie_port_device_register() method for
132  * this port device.
133  *
134  */
135 static int pcie_portdrv_probe(struct pci_dev *dev,
136                                         const struct pci_device_id *id)
137 {
138         int status;
139 
140         if (!pci_is_pcie(dev) ||
141             ((pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) &&
142              (pci_pcie_type(dev) != PCI_EXP_TYPE_UPSTREAM) &&
143              (pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM)))
144                 return -ENODEV;
145 
146         status = pcie_port_device_register(dev);
147         if (status)
148                 return status;
149 
150         pci_save_state(dev);
151 
152         /*
153          * Prevent runtime PM if the port is advertising support for PCIe
154          * hotplug.  Otherwise the BIOS hotplug SMI code might not be able
155          * to enumerate devices behind this port properly (the port is
156          * powered down preventing all config space accesses to the
157          * subordinate devices).  We can't be sure for native PCIe hotplug
158          * either so prevent that as well.
159          */
160         if (!dev->is_hotplug_bridge) {
161                 /*
162                  * Keep the port resumed 100ms to make sure things like
163                  * config space accesses from userspace (lspci) will not
164                  * cause the port to repeatedly suspend and resume.
165                  */
166                 pm_runtime_set_autosuspend_delay(&dev->dev, 100);
167                 pm_runtime_use_autosuspend(&dev->dev);
168                 pm_runtime_mark_last_busy(&dev->dev);
169                 pm_runtime_put_autosuspend(&dev->dev);
170                 pm_runtime_allow(&dev->dev);
171         }
172 
173         return 0;
174 }
175 
176 static void pcie_portdrv_remove(struct pci_dev *dev)
177 {
178         if (!dev->is_hotplug_bridge) {
179                 pm_runtime_forbid(&dev->dev);
180                 pm_runtime_get_noresume(&dev->dev);
181                 pm_runtime_dont_use_autosuspend(&dev->dev);
182         }
183 
184         pcie_port_device_remove(dev);
185 }
186 
187 static int error_detected_iter(struct device *device, void *data)
188 {
189         struct pcie_device *pcie_device;
190         struct pcie_port_service_driver *driver;
191         struct aer_broadcast_data *result_data;
192         pci_ers_result_t status;
193 
194         result_data = (struct aer_broadcast_data *) data;
195 
196         if (device->bus == &pcie_port_bus_type && device->driver) {
197                 driver = to_service_driver(device->driver);
198                 if (!driver ||
199                         !driver->err_handler ||
200                         !driver->err_handler->error_detected)
201                         return 0;
202 
203                 pcie_device = to_pcie_device(device);
204 
205                 /* Forward error detected message to service drivers */
206                 status = driver->err_handler->error_detected(
207                         pcie_device->port,
208                         result_data->state);
209                 result_data->result =
210                         merge_result(result_data->result, status);
211         }
212 
213         return 0;
214 }
215 
216 static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
217                                         enum pci_channel_state error)
218 {
219         struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER};
220 
221         /* get true return value from &data */
222         device_for_each_child(&dev->dev, &data, error_detected_iter);
223         return data.result;
224 }
225 
226 static int mmio_enabled_iter(struct device *device, void *data)
227 {
228         struct pcie_device *pcie_device;
229         struct pcie_port_service_driver *driver;
230         pci_ers_result_t status, *result;
231 
232         result = (pci_ers_result_t *) data;
233 
234         if (device->bus == &pcie_port_bus_type && device->driver) {
235                 driver = to_service_driver(device->driver);
236                 if (driver &&
237                         driver->err_handler &&
238                         driver->err_handler->mmio_enabled) {
239                         pcie_device = to_pcie_device(device);
240 
241                         /* Forward error message to service drivers */
242                         status = driver->err_handler->mmio_enabled(
243                                         pcie_device->port);
244                         *result = merge_result(*result, status);
245                 }
246         }
247 
248         return 0;
249 }
250 
251 static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
252 {
253         pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
254 
255         /* get true return value from &status */
256         device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
257         return status;
258 }
259 
260 static int slot_reset_iter(struct device *device, void *data)
261 {
262         struct pcie_device *pcie_device;
263         struct pcie_port_service_driver *driver;
264         pci_ers_result_t status, *result;
265 
266         result = (pci_ers_result_t *) data;
267 
268         if (device->bus == &pcie_port_bus_type && device->driver) {
269                 driver = to_service_driver(device->driver);
270                 if (driver &&
271                         driver->err_handler &&
272                         driver->err_handler->slot_reset) {
273                         pcie_device = to_pcie_device(device);
274 
275                         /* Forward error message to service drivers */
276                         status = driver->err_handler->slot_reset(
277                                         pcie_device->port);
278                         *result = merge_result(*result, status);
279                 }
280         }
281 
282         return 0;
283 }
284 
285 static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
286 {
287         pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
288 
289         /* If fatal, restore cfg space for possible link reset at upstream */
290         if (dev->error_state == pci_channel_io_frozen) {
291                 dev->state_saved = true;
292                 pci_restore_state(dev);
293                 pcie_portdrv_restore_config(dev);
294                 pci_enable_pcie_error_reporting(dev);
295         }
296 
297         /* get true return value from &status */
298         device_for_each_child(&dev->dev, &status, slot_reset_iter);
299         return status;
300 }
301 
302 static int resume_iter(struct device *device, void *data)
303 {
304         struct pcie_device *pcie_device;
305         struct pcie_port_service_driver *driver;
306 
307         if (device->bus == &pcie_port_bus_type && device->driver) {
308                 driver = to_service_driver(device->driver);
309                 if (driver &&
310                         driver->err_handler &&
311                         driver->err_handler->resume) {
312                         pcie_device = to_pcie_device(device);
313 
314                         /* Forward error message to service drivers */
315                         driver->err_handler->resume(pcie_device->port);
316                 }
317         }
318 
319         return 0;
320 }
321 
322 static void pcie_portdrv_err_resume(struct pci_dev *dev)
323 {
324         device_for_each_child(&dev->dev, NULL, resume_iter);
325 }
326 
327 /*
328  * LINUX Device Driver Model
329  */
330 static const struct pci_device_id port_pci_ids[] = { {
331         /* handle any PCI-Express port */
332         PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
333         }, { /* end: all zeroes */ }
334 };
335 
336 static const struct pci_error_handlers pcie_portdrv_err_handler = {
337         .error_detected = pcie_portdrv_error_detected,
338         .mmio_enabled = pcie_portdrv_mmio_enabled,
339         .slot_reset = pcie_portdrv_slot_reset,
340         .resume = pcie_portdrv_err_resume,
341 };
342 
343 static struct pci_driver pcie_portdriver = {
344         .name           = "pcieport",
345         .id_table       = &port_pci_ids[0],
346 
347         .probe          = pcie_portdrv_probe,
348         .remove         = pcie_portdrv_remove,
349 
350         .err_handler    = &pcie_portdrv_err_handler,
351 
352         .driver.pm      = PCIE_PORTDRV_PM_OPS,
353 };
354 
355 static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d)
356 {
357         pr_notice("%s detected: will not use MSI for PCIe PME signaling\n",
358                   d->ident);
359         pcie_pme_disable_msi();
360         return 0;
361 }
362 
363 static struct dmi_system_id __initdata pcie_portdrv_dmi_table[] = {
364         /*
365          * Boxes that should not use MSI for PCIe PME signaling.
366          */
367         {
368          .callback = dmi_pcie_pme_disable_msi,
369          .ident = "MSI Wind U-100",
370          .matches = {
371                      DMI_MATCH(DMI_SYS_VENDOR,
372                                 "MICRO-STAR INTERNATIONAL CO., LTD"),
373                      DMI_MATCH(DMI_PRODUCT_NAME, "U-100"),
374                      },
375          },
376          {}
377 };
378 
379 static int __init pcie_portdrv_init(void)
380 {
381         int retval;
382 
383         if (pcie_ports_disabled)
384                 return pci_register_driver(&pcie_portdriver);
385 
386         dmi_check_system(pcie_portdrv_dmi_table);
387 
388         retval = pcie_port_bus_register();
389         if (retval) {
390                 printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
391                 goto out;
392         }
393         retval = pci_register_driver(&pcie_portdriver);
394         if (retval)
395                 pcie_port_bus_unregister();
396  out:
397         return retval;
398 }
399 device_initcall(pcie_portdrv_init);
400 

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