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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 "../pci.h"
 23 #include "portdrv.h"
 24 #include "aer/aerdrv.h"
 25 
 26 /* If this switch is set, PCIe port native services should not be enabled. */
 27 bool pcie_ports_disabled;
 28 
 29 /*
 30  * If this switch is set, ACPI _OSC will be used to determine whether or not to
 31  * enable PCIe port native services.
 32  */
 33 bool pcie_ports_auto = true;
 34 
 35 static int __init pcie_port_setup(char *str)
 36 {
 37         if (!strncmp(str, "compat", 6)) {
 38                 pcie_ports_disabled = true;
 39         } else if (!strncmp(str, "native", 6)) {
 40                 pcie_ports_disabled = false;
 41                 pcie_ports_auto = false;
 42         } else if (!strncmp(str, "auto", 4)) {
 43                 pcie_ports_disabled = false;
 44                 pcie_ports_auto = true;
 45         }
 46 
 47         return 1;
 48 }
 49 __setup("pcie_ports=", pcie_port_setup);
 50 
 51 /* global data */
 52 
 53 /**
 54  * pcie_clear_root_pme_status - Clear root port PME interrupt status.
 55  * @dev: PCIe root port or event collector.
 56  */
 57 void pcie_clear_root_pme_status(struct pci_dev *dev)
 58 {
 59         pcie_capability_set_dword(dev, PCI_EXP_RTSTA, PCI_EXP_RTSTA_PME);
 60 }
 61 
 62 static int pcie_portdrv_restore_config(struct pci_dev *dev)
 63 {
 64         int retval;
 65 
 66         retval = pci_enable_device(dev);
 67         if (retval)
 68                 return retval;
 69         pci_set_master(dev);
 70         return 0;
 71 }
 72 
 73 #ifdef CONFIG_PM
 74 static int pcie_port_resume_noirq(struct device *dev)
 75 {
 76         struct pci_dev *pdev = to_pci_dev(dev);
 77 
 78         /*
 79          * Some BIOSes forget to clear Root PME Status bits after system wakeup
 80          * which breaks ACPI-based runtime wakeup on PCI Express, so clear those
 81          * bits now just in case (shouldn't hurt).
 82          */
 83         if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT)
 84                 pcie_clear_root_pme_status(pdev);
 85         return 0;
 86 }
 87 
 88 static int pcie_port_runtime_suspend(struct device *dev)
 89 {
 90         return to_pci_dev(dev)->bridge_d3 ? 0 : -EBUSY;
 91 }
 92 
 93 static int pcie_port_runtime_resume(struct device *dev)
 94 {
 95         return 0;
 96 }
 97 
 98 static int pcie_port_runtime_idle(struct device *dev)
 99 {
100         /*
101          * Assume the PCI core has set bridge_d3 whenever it thinks the port
102          * should be good to go to D3.  Everything else, including moving
103          * the port to D3, is handled by the PCI core.
104          */
105         return to_pci_dev(dev)->bridge_d3 ? 0 : -EBUSY;
106 }
107 
108 static const struct dev_pm_ops pcie_portdrv_pm_ops = {
109         .suspend        = pcie_port_device_suspend,
110         .resume         = pcie_port_device_resume,
111         .freeze         = pcie_port_device_suspend,
112         .thaw           = pcie_port_device_resume,
113         .poweroff       = pcie_port_device_suspend,
114         .restore        = pcie_port_device_resume,
115         .resume_noirq   = pcie_port_resume_noirq,
116         .runtime_suspend = pcie_port_runtime_suspend,
117         .runtime_resume = pcie_port_runtime_resume,
118         .runtime_idle   = pcie_port_runtime_idle,
119 };
120 
121 #define PCIE_PORTDRV_PM_OPS     (&pcie_portdrv_pm_ops)
122 
123 #else /* !PM */
124 
125 #define PCIE_PORTDRV_PM_OPS     NULL
126 #endif /* !PM */
127 
128 /*
129  * pcie_portdrv_probe - Probe PCI-Express port devices
130  * @dev: PCI-Express port device being probed
131  *
132  * If detected invokes the pcie_port_device_register() method for
133  * this port device.
134  *
135  */
136 static int pcie_portdrv_probe(struct pci_dev *dev,
137                                         const struct pci_device_id *id)
138 {
139         int status;
140 
141         if (!pci_is_pcie(dev) ||
142             ((pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) &&
143              (pci_pcie_type(dev) != PCI_EXP_TYPE_UPSTREAM) &&
144              (pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM)))
145                 return -ENODEV;
146 
147         status = pcie_port_device_register(dev);
148         if (status)
149                 return status;
150 
151         pci_save_state(dev);
152 
153         if (pci_bridge_d3_possible(dev)) {
154                 /*
155                  * Keep the port resumed 100ms to make sure things like
156                  * config space accesses from userspace (lspci) will not
157                  * cause the port to repeatedly suspend and resume.
158                  */
159                 pm_runtime_set_autosuspend_delay(&dev->dev, 100);
160                 pm_runtime_use_autosuspend(&dev->dev);
161                 pm_runtime_mark_last_busy(&dev->dev);
162                 pm_runtime_put_autosuspend(&dev->dev);
163                 pm_runtime_allow(&dev->dev);
164         }
165 
166         return 0;
167 }
168 
169 static void pcie_portdrv_remove(struct pci_dev *dev)
170 {
171         if (pci_bridge_d3_possible(dev)) {
172                 pm_runtime_forbid(&dev->dev);
173                 pm_runtime_get_noresume(&dev->dev);
174                 pm_runtime_dont_use_autosuspend(&dev->dev);
175         }
176 
177         pcie_port_device_remove(dev);
178 }
179 
180 static int error_detected_iter(struct device *device, void *data)
181 {
182         struct pcie_device *pcie_device;
183         struct pcie_port_service_driver *driver;
184         struct aer_broadcast_data *result_data;
185         pci_ers_result_t status;
186 
187         result_data = (struct aer_broadcast_data *) data;
188 
189         if (device->bus == &pcie_port_bus_type && device->driver) {
190                 driver = to_service_driver(device->driver);
191                 if (!driver ||
192                         !driver->err_handler ||
193                         !driver->err_handler->error_detected)
194                         return 0;
195 
196                 pcie_device = to_pcie_device(device);
197 
198                 /* Forward error detected message to service drivers */
199                 status = driver->err_handler->error_detected(
200                         pcie_device->port,
201                         result_data->state);
202                 result_data->result =
203                         merge_result(result_data->result, status);
204         }
205 
206         return 0;
207 }
208 
209 static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
210                                         enum pci_channel_state error)
211 {
212         struct aer_broadcast_data data = {error, PCI_ERS_RESULT_CAN_RECOVER};
213 
214         /* get true return value from &data */
215         device_for_each_child(&dev->dev, &data, error_detected_iter);
216         return data.result;
217 }
218 
219 static int mmio_enabled_iter(struct device *device, void *data)
220 {
221         struct pcie_device *pcie_device;
222         struct pcie_port_service_driver *driver;
223         pci_ers_result_t status, *result;
224 
225         result = (pci_ers_result_t *) data;
226 
227         if (device->bus == &pcie_port_bus_type && device->driver) {
228                 driver = to_service_driver(device->driver);
229                 if (driver &&
230                         driver->err_handler &&
231                         driver->err_handler->mmio_enabled) {
232                         pcie_device = to_pcie_device(device);
233 
234                         /* Forward error message to service drivers */
235                         status = driver->err_handler->mmio_enabled(
236                                         pcie_device->port);
237                         *result = merge_result(*result, status);
238                 }
239         }
240 
241         return 0;
242 }
243 
244 static pci_ers_result_t pcie_portdrv_mmio_enabled(struct pci_dev *dev)
245 {
246         pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
247 
248         /* get true return value from &status */
249         device_for_each_child(&dev->dev, &status, mmio_enabled_iter);
250         return status;
251 }
252 
253 static int slot_reset_iter(struct device *device, void *data)
254 {
255         struct pcie_device *pcie_device;
256         struct pcie_port_service_driver *driver;
257         pci_ers_result_t status, *result;
258 
259         result = (pci_ers_result_t *) data;
260 
261         if (device->bus == &pcie_port_bus_type && device->driver) {
262                 driver = to_service_driver(device->driver);
263                 if (driver &&
264                         driver->err_handler &&
265                         driver->err_handler->slot_reset) {
266                         pcie_device = to_pcie_device(device);
267 
268                         /* Forward error message to service drivers */
269                         status = driver->err_handler->slot_reset(
270                                         pcie_device->port);
271                         *result = merge_result(*result, status);
272                 }
273         }
274 
275         return 0;
276 }
277 
278 static pci_ers_result_t pcie_portdrv_slot_reset(struct pci_dev *dev)
279 {
280         pci_ers_result_t status = PCI_ERS_RESULT_RECOVERED;
281 
282         /* If fatal, restore cfg space for possible link reset at upstream */
283         if (dev->error_state == pci_channel_io_frozen) {
284                 dev->state_saved = true;
285                 pci_restore_state(dev);
286                 pcie_portdrv_restore_config(dev);
287                 pci_enable_pcie_error_reporting(dev);
288         }
289 
290         /* get true return value from &status */
291         device_for_each_child(&dev->dev, &status, slot_reset_iter);
292         return status;
293 }
294 
295 static int resume_iter(struct device *device, void *data)
296 {
297         struct pcie_device *pcie_device;
298         struct pcie_port_service_driver *driver;
299 
300         if (device->bus == &pcie_port_bus_type && device->driver) {
301                 driver = to_service_driver(device->driver);
302                 if (driver &&
303                         driver->err_handler &&
304                         driver->err_handler->resume) {
305                         pcie_device = to_pcie_device(device);
306 
307                         /* Forward error message to service drivers */
308                         driver->err_handler->resume(pcie_device->port);
309                 }
310         }
311 
312         return 0;
313 }
314 
315 static void pcie_portdrv_err_resume(struct pci_dev *dev)
316 {
317         device_for_each_child(&dev->dev, NULL, resume_iter);
318 }
319 
320 /*
321  * LINUX Device Driver Model
322  */
323 static const struct pci_device_id port_pci_ids[] = { {
324         /* handle any PCI-Express port */
325         PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
326         }, { /* end: all zeroes */ }
327 };
328 
329 static const struct pci_error_handlers pcie_portdrv_err_handler = {
330         .error_detected = pcie_portdrv_error_detected,
331         .mmio_enabled = pcie_portdrv_mmio_enabled,
332         .slot_reset = pcie_portdrv_slot_reset,
333         .resume = pcie_portdrv_err_resume,
334 };
335 
336 static struct pci_driver pcie_portdriver = {
337         .name           = "pcieport",
338         .id_table       = &port_pci_ids[0],
339 
340         .probe          = pcie_portdrv_probe,
341         .remove         = pcie_portdrv_remove,
342 
343         .err_handler    = &pcie_portdrv_err_handler,
344 
345         .driver.pm      = PCIE_PORTDRV_PM_OPS,
346 };
347 
348 static int __init dmi_pcie_pme_disable_msi(const struct dmi_system_id *d)
349 {
350         pr_notice("%s detected: will not use MSI for PCIe PME signaling\n",
351                   d->ident);
352         pcie_pme_disable_msi();
353         return 0;
354 }
355 
356 static struct dmi_system_id __initdata pcie_portdrv_dmi_table[] = {
357         /*
358          * Boxes that should not use MSI for PCIe PME signaling.
359          */
360         {
361          .callback = dmi_pcie_pme_disable_msi,
362          .ident = "MSI Wind U-100",
363          .matches = {
364                      DMI_MATCH(DMI_SYS_VENDOR,
365                                 "MICRO-STAR INTERNATIONAL CO., LTD"),
366                      DMI_MATCH(DMI_PRODUCT_NAME, "U-100"),
367                      },
368          },
369          {}
370 };
371 
372 static int __init pcie_portdrv_init(void)
373 {
374         int retval;
375 
376         if (pcie_ports_disabled)
377                 return pci_register_driver(&pcie_portdriver);
378 
379         dmi_check_system(pcie_portdrv_dmi_table);
380 
381         retval = pcie_port_bus_register();
382         if (retval) {
383                 printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval);
384                 goto out;
385         }
386         retval = pci_register_driver(&pcie_portdriver);
387         if (retval)
388                 pcie_port_bus_unregister();
389  out:
390         return retval;
391 }
392 device_initcall(pcie_portdrv_init);
393 

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