diff options
Diffstat (limited to 'drivers/pci/pci-driver.c')
| -rw-r--r-- | drivers/pci/pci-driver.c | 1659 |
1 files changed, 1659 insertions, 0 deletions
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c new file mode 100644 index 000000000..c22cc20db --- /dev/null +++ b/drivers/pci/pci-driver.c @@ -0,0 +1,1659 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * (C) Copyright 2002-2004, 2007 Greg Kroah-Hartman <greg@kroah.com> + * (C) Copyright 2007 Novell Inc. + */ + +#include <linux/pci.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/device.h> +#include <linux/mempolicy.h> +#include <linux/string.h> +#include <linux/slab.h> +#include <linux/sched.h> +#include <linux/sched/isolation.h> +#include <linux/cpu.h> +#include <linux/pm_runtime.h> +#include <linux/suspend.h> +#include <linux/kexec.h> +#include <linux/of_device.h> +#include <linux/acpi.h> +#include <linux/dma-map-ops.h> +#include "pci.h" +#include "pcie/portdrv.h" + +struct pci_dynid { + struct list_head node; + struct pci_device_id id; +}; + +/** + * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices + * @drv: target pci driver + * @vendor: PCI vendor ID + * @device: PCI device ID + * @subvendor: PCI subvendor ID + * @subdevice: PCI subdevice ID + * @class: PCI class + * @class_mask: PCI class mask + * @driver_data: private driver data + * + * Adds a new dynamic pci device ID to this driver and causes the + * driver to probe for all devices again. @drv must have been + * registered prior to calling this function. + * + * CONTEXT: + * Does GFP_KERNEL allocation. + * + * RETURNS: + * 0 on success, -errno on failure. + */ +int pci_add_dynid(struct pci_driver *drv, + unsigned int vendor, unsigned int device, + unsigned int subvendor, unsigned int subdevice, + unsigned int class, unsigned int class_mask, + unsigned long driver_data) +{ + struct pci_dynid *dynid; + + dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); + if (!dynid) + return -ENOMEM; + + dynid->id.vendor = vendor; + dynid->id.device = device; + dynid->id.subvendor = subvendor; + dynid->id.subdevice = subdevice; + dynid->id.class = class; + dynid->id.class_mask = class_mask; + dynid->id.driver_data = driver_data; + + spin_lock(&drv->dynids.lock); + list_add_tail(&dynid->node, &drv->dynids.list); + spin_unlock(&drv->dynids.lock); + + return driver_attach(&drv->driver); +} +EXPORT_SYMBOL_GPL(pci_add_dynid); + +static void pci_free_dynids(struct pci_driver *drv) +{ + struct pci_dynid *dynid, *n; + + spin_lock(&drv->dynids.lock); + list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { + list_del(&dynid->node); + kfree(dynid); + } + spin_unlock(&drv->dynids.lock); +} + +/** + * store_new_id - sysfs frontend to pci_add_dynid() + * @driver: target device driver + * @buf: buffer for scanning device ID data + * @count: input size + * + * Allow PCI IDs to be added to an existing driver via sysfs. + */ +static ssize_t new_id_store(struct device_driver *driver, const char *buf, + size_t count) +{ + struct pci_driver *pdrv = to_pci_driver(driver); + const struct pci_device_id *ids = pdrv->id_table; + u32 vendor, device, subvendor = PCI_ANY_ID, + subdevice = PCI_ANY_ID, class = 0, class_mask = 0; + unsigned long driver_data = 0; + int fields = 0; + int retval = 0; + + fields = sscanf(buf, "%x %x %x %x %x %x %lx", + &vendor, &device, &subvendor, &subdevice, + &class, &class_mask, &driver_data); + if (fields < 2) + return -EINVAL; + + if (fields != 7) { + struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL); + if (!pdev) + return -ENOMEM; + + pdev->vendor = vendor; + pdev->device = device; + pdev->subsystem_vendor = subvendor; + pdev->subsystem_device = subdevice; + pdev->class = class; + + if (pci_match_id(pdrv->id_table, pdev)) + retval = -EEXIST; + + kfree(pdev); + + if (retval) + return retval; + } + + /* Only accept driver_data values that match an existing id_table + entry */ + if (ids) { + retval = -EINVAL; + while (ids->vendor || ids->subvendor || ids->class_mask) { + if (driver_data == ids->driver_data) { + retval = 0; + break; + } + ids++; + } + if (retval) /* No match */ + return retval; + } + + retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice, + class, class_mask, driver_data); + if (retval) + return retval; + return count; +} +static DRIVER_ATTR_WO(new_id); + +/** + * store_remove_id - remove a PCI device ID from this driver + * @driver: target device driver + * @buf: buffer for scanning device ID data + * @count: input size + * + * Removes a dynamic pci device ID to this driver. + */ +static ssize_t remove_id_store(struct device_driver *driver, const char *buf, + size_t count) +{ + struct pci_dynid *dynid, *n; + struct pci_driver *pdrv = to_pci_driver(driver); + u32 vendor, device, subvendor = PCI_ANY_ID, + subdevice = PCI_ANY_ID, class = 0, class_mask = 0; + int fields = 0; + size_t retval = -ENODEV; + + fields = sscanf(buf, "%x %x %x %x %x %x", + &vendor, &device, &subvendor, &subdevice, + &class, &class_mask); + if (fields < 2) + return -EINVAL; + + spin_lock(&pdrv->dynids.lock); + list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) { + struct pci_device_id *id = &dynid->id; + if ((id->vendor == vendor) && + (id->device == device) && + (subvendor == PCI_ANY_ID || id->subvendor == subvendor) && + (subdevice == PCI_ANY_ID || id->subdevice == subdevice) && + !((id->class ^ class) & class_mask)) { + list_del(&dynid->node); + kfree(dynid); + retval = count; + break; + } + } + spin_unlock(&pdrv->dynids.lock); + + return retval; +} +static DRIVER_ATTR_WO(remove_id); + +static struct attribute *pci_drv_attrs[] = { + &driver_attr_new_id.attr, + &driver_attr_remove_id.attr, + NULL, +}; +ATTRIBUTE_GROUPS(pci_drv); + +/** + * pci_match_id - See if a pci device matches a given pci_id table + * @ids: array of PCI device id structures to search in + * @dev: the PCI device structure to match against. + * + * Used by a driver to check whether a PCI device present in the + * system is in its list of supported devices. Returns the matching + * pci_device_id structure or %NULL if there is no match. + * + * Deprecated, don't use this as it will not catch any dynamic ids + * that a driver might want to check for. + */ +const struct pci_device_id *pci_match_id(const struct pci_device_id *ids, + struct pci_dev *dev) +{ + if (ids) { + while (ids->vendor || ids->subvendor || ids->class_mask) { + if (pci_match_one_device(ids, dev)) + return ids; + ids++; + } + } + return NULL; +} +EXPORT_SYMBOL(pci_match_id); + +static const struct pci_device_id pci_device_id_any = { + .vendor = PCI_ANY_ID, + .device = PCI_ANY_ID, + .subvendor = PCI_ANY_ID, + .subdevice = PCI_ANY_ID, +}; + +/** + * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure + * @drv: the PCI driver to match against + * @dev: the PCI device structure to match against + * + * Used by a driver to check whether a PCI device present in the + * system is in its list of supported devices. Returns the matching + * pci_device_id structure or %NULL if there is no match. + */ +static const struct pci_device_id *pci_match_device(struct pci_driver *drv, + struct pci_dev *dev) +{ + struct pci_dynid *dynid; + const struct pci_device_id *found_id = NULL; + + /* When driver_override is set, only bind to the matching driver */ + if (dev->driver_override && strcmp(dev->driver_override, drv->name)) + return NULL; + + /* Look at the dynamic ids first, before the static ones */ + spin_lock(&drv->dynids.lock); + list_for_each_entry(dynid, &drv->dynids.list, node) { + if (pci_match_one_device(&dynid->id, dev)) { + found_id = &dynid->id; + break; + } + } + spin_unlock(&drv->dynids.lock); + + if (!found_id) + found_id = pci_match_id(drv->id_table, dev); + + /* driver_override will always match, send a dummy id */ + if (!found_id && dev->driver_override) + found_id = &pci_device_id_any; + + return found_id; +} + +struct drv_dev_and_id { + struct pci_driver *drv; + struct pci_dev *dev; + const struct pci_device_id *id; +}; + +static long local_pci_probe(void *_ddi) +{ + struct drv_dev_and_id *ddi = _ddi; + struct pci_dev *pci_dev = ddi->dev; + struct pci_driver *pci_drv = ddi->drv; + struct device *dev = &pci_dev->dev; + int rc; + + /* + * Unbound PCI devices are always put in D0, regardless of + * runtime PM status. During probe, the device is set to + * active and the usage count is incremented. If the driver + * supports runtime PM, it should call pm_runtime_put_noidle(), + * or any other runtime PM helper function decrementing the usage + * count, in its probe routine and pm_runtime_get_noresume() in + * its remove routine. + */ + pm_runtime_get_sync(dev); + pci_dev->driver = pci_drv; + rc = pci_drv->probe(pci_dev, ddi->id); + if (!rc) + return rc; + if (rc < 0) { + pci_dev->driver = NULL; + pm_runtime_put_sync(dev); + return rc; + } + /* + * Probe function should return < 0 for failure, 0 for success + * Treat values > 0 as success, but warn. + */ + pci_warn(pci_dev, "Driver probe function unexpectedly returned %d\n", + rc); + return 0; +} + +static bool pci_physfn_is_probed(struct pci_dev *dev) +{ +#ifdef CONFIG_PCI_IOV + return dev->is_virtfn && dev->physfn->is_probed; +#else + return false; +#endif +} + +static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev, + const struct pci_device_id *id) +{ + int error, node, cpu; + int hk_flags = HK_FLAG_DOMAIN | HK_FLAG_WQ; + struct drv_dev_and_id ddi = { drv, dev, id }; + + /* + * Execute driver initialization on node where the device is + * attached. This way the driver likely allocates its local memory + * on the right node. + */ + node = dev_to_node(&dev->dev); + dev->is_probed = 1; + + cpu_hotplug_disable(); + + /* + * Prevent nesting work_on_cpu() for the case where a Virtual Function + * device is probed from work_on_cpu() of the Physical device. + */ + if (node < 0 || node >= MAX_NUMNODES || !node_online(node) || + pci_physfn_is_probed(dev)) + cpu = nr_cpu_ids; + else + cpu = cpumask_any_and(cpumask_of_node(node), + housekeeping_cpumask(hk_flags)); + + if (cpu < nr_cpu_ids) + error = work_on_cpu(cpu, local_pci_probe, &ddi); + else + error = local_pci_probe(&ddi); + + dev->is_probed = 0; + cpu_hotplug_enable(); + return error; +} + +/** + * __pci_device_probe - check if a driver wants to claim a specific PCI device + * @drv: driver to call to check if it wants the PCI device + * @pci_dev: PCI device being probed + * + * returns 0 on success, else error. + * side-effect: pci_dev->driver is set to drv when drv claims pci_dev. + */ +static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev) +{ + const struct pci_device_id *id; + int error = 0; + + if (!pci_dev->driver && drv->probe) { + error = -ENODEV; + + id = pci_match_device(drv, pci_dev); + if (id) + error = pci_call_probe(drv, pci_dev, id); + } + return error; +} + +int __weak pcibios_alloc_irq(struct pci_dev *dev) +{ + return 0; +} + +void __weak pcibios_free_irq(struct pci_dev *dev) +{ +} + +#ifdef CONFIG_PCI_IOV +static inline bool pci_device_can_probe(struct pci_dev *pdev) +{ + return (!pdev->is_virtfn || pdev->physfn->sriov->drivers_autoprobe || + pdev->driver_override); +} +#else +static inline bool pci_device_can_probe(struct pci_dev *pdev) +{ + return true; +} +#endif + +static int pci_device_probe(struct device *dev) +{ + int error; + struct pci_dev *pci_dev = to_pci_dev(dev); + struct pci_driver *drv = to_pci_driver(dev->driver); + + if (!pci_device_can_probe(pci_dev)) + return -ENODEV; + + pci_assign_irq(pci_dev); + + error = pcibios_alloc_irq(pci_dev); + if (error < 0) + return error; + + pci_dev_get(pci_dev); + error = __pci_device_probe(drv, pci_dev); + if (error) { + pcibios_free_irq(pci_dev); + pci_dev_put(pci_dev); + } + + return error; +} + +static int pci_device_remove(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + struct pci_driver *drv = pci_dev->driver; + + if (drv) { + if (drv->remove) { + pm_runtime_get_sync(dev); + drv->remove(pci_dev); + pm_runtime_put_noidle(dev); + } + pcibios_free_irq(pci_dev); + pci_dev->driver = NULL; + pci_iov_remove(pci_dev); + } + + /* Undo the runtime PM settings in local_pci_probe() */ + pm_runtime_put_sync(dev); + + /* + * If the device is still on, set the power state as "unknown", + * since it might change by the next time we load the driver. + */ + if (pci_dev->current_state == PCI_D0) + pci_dev->current_state = PCI_UNKNOWN; + + /* + * We would love to complain here if pci_dev->is_enabled is set, that + * the driver should have called pci_disable_device(), but the + * unfortunate fact is there are too many odd BIOS and bridge setups + * that don't like drivers doing that all of the time. + * Oh well, we can dream of sane hardware when we sleep, no matter how + * horrible the crap we have to deal with is when we are awake... + */ + + pci_dev_put(pci_dev); + return 0; +} + +static void pci_device_shutdown(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + struct pci_driver *drv = pci_dev->driver; + + pm_runtime_resume(dev); + + if (drv && drv->shutdown) + drv->shutdown(pci_dev); + + /* + * If this is a kexec reboot, turn off Bus Master bit on the + * device to tell it to not continue to do DMA. Don't touch + * devices in D3cold or unknown states. + * If it is not a kexec reboot, firmware will hit the PCI + * devices with big hammer and stop their DMA any way. + */ + if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot)) + pci_clear_master(pci_dev); +} + +#ifdef CONFIG_PM + +/* Auxiliary functions used for system resume and run-time resume. */ + +/** + * pci_restore_standard_config - restore standard config registers of PCI device + * @pci_dev: PCI device to handle + */ +static int pci_restore_standard_config(struct pci_dev *pci_dev) +{ + pci_update_current_state(pci_dev, PCI_UNKNOWN); + + if (pci_dev->current_state != PCI_D0) { + int error = pci_set_power_state(pci_dev, PCI_D0); + if (error) + return error; + } + + pci_restore_state(pci_dev); + pci_pme_restore(pci_dev); + return 0; +} + +static void pci_pm_default_resume(struct pci_dev *pci_dev) +{ + pci_fixup_device(pci_fixup_resume, pci_dev); + pci_enable_wake(pci_dev, PCI_D0, false); +} + +#endif + +#ifdef CONFIG_PM_SLEEP + +static void pci_pm_default_resume_early(struct pci_dev *pci_dev) +{ + pci_power_up(pci_dev); + pci_update_current_state(pci_dev, PCI_D0); + pci_restore_state(pci_dev); + pci_pme_restore(pci_dev); +} + +/* + * Default "suspend" method for devices that have no driver provided suspend, + * or not even a driver at all (second part). + */ +static void pci_pm_set_unknown_state(struct pci_dev *pci_dev) +{ + /* + * mark its power state as "unknown", since we don't know if + * e.g. the BIOS will change its device state when we suspend. + */ + if (pci_dev->current_state == PCI_D0) + pci_dev->current_state = PCI_UNKNOWN; +} + +/* + * Default "resume" method for devices that have no driver provided resume, + * or not even a driver at all (second part). + */ +static int pci_pm_reenable_device(struct pci_dev *pci_dev) +{ + int retval; + + /* if the device was enabled before suspend, reenable */ + retval = pci_reenable_device(pci_dev); + /* + * if the device was busmaster before the suspend, make it busmaster + * again + */ + if (pci_dev->is_busmaster) + pci_set_master(pci_dev); + + return retval; +} + +static int pci_legacy_suspend(struct device *dev, pm_message_t state) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + struct pci_driver *drv = pci_dev->driver; + + if (drv && drv->suspend) { + pci_power_t prev = pci_dev->current_state; + int error; + + error = drv->suspend(pci_dev, state); + suspend_report_result(drv->suspend, error); + if (error) + return error; + + if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 + && pci_dev->current_state != PCI_UNKNOWN) { + pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev, + "PCI PM: Device state not saved by %pS\n", + drv->suspend); + } + } + + pci_fixup_device(pci_fixup_suspend, pci_dev); + + return 0; +} + +static int pci_legacy_suspend_late(struct device *dev, pm_message_t state) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + + if (!pci_dev->state_saved) + pci_save_state(pci_dev); + + pci_pm_set_unknown_state(pci_dev); + + pci_fixup_device(pci_fixup_suspend_late, pci_dev); + + return 0; +} + +static int pci_legacy_resume(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + struct pci_driver *drv = pci_dev->driver; + + pci_fixup_device(pci_fixup_resume, pci_dev); + + return drv && drv->resume ? + drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev); +} + +/* Auxiliary functions used by the new power management framework */ + +static void pci_pm_default_suspend(struct pci_dev *pci_dev) +{ + /* Disable non-bridge devices without PM support */ + if (!pci_has_subordinate(pci_dev)) + pci_disable_enabled_device(pci_dev); +} + +static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev) +{ + struct pci_driver *drv = pci_dev->driver; + bool ret = drv && (drv->suspend || drv->resume); + + /* + * Legacy PM support is used by default, so warn if the new framework is + * supported as well. Drivers are supposed to support either the + * former, or the latter, but not both at the same time. + */ + pci_WARN(pci_dev, ret && drv->driver.pm, "device %04x:%04x\n", + pci_dev->vendor, pci_dev->device); + + return ret; +} + +/* New power management framework */ + +static int pci_pm_prepare(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + if (pm && pm->prepare) { + int error = pm->prepare(dev); + if (error < 0) + return error; + + if (!error && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE)) + return 0; + } + if (pci_dev_need_resume(pci_dev)) + return 0; + + /* + * The PME setting needs to be adjusted here in case the direct-complete + * optimization is used with respect to this device. + */ + pci_dev_adjust_pme(pci_dev); + return 1; +} + +static void pci_pm_complete(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + + pci_dev_complete_resume(pci_dev); + pm_generic_complete(dev); + + /* Resume device if platform firmware has put it in reset-power-on */ + if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) { + pci_power_t pre_sleep_state = pci_dev->current_state; + + pci_refresh_power_state(pci_dev); + /* + * On platforms with ACPI this check may also trigger for + * devices sharing power resources if one of those power + * resources has been activated as a result of a change of the + * power state of another device sharing it. However, in that + * case it is also better to resume the device, in general. + */ + if (pci_dev->current_state < pre_sleep_state) + pm_request_resume(dev); + } +} + +#else /* !CONFIG_PM_SLEEP */ + +#define pci_pm_prepare NULL +#define pci_pm_complete NULL + +#endif /* !CONFIG_PM_SLEEP */ + +#ifdef CONFIG_SUSPEND +static void pcie_pme_root_status_cleanup(struct pci_dev *pci_dev) +{ + /* + * Some BIOSes forget to clear Root PME Status bits after system + * wakeup, which breaks ACPI-based runtime wakeup on PCI Express. + * Clear those bits now just in case (shouldn't hurt). + */ + if (pci_is_pcie(pci_dev) && + (pci_pcie_type(pci_dev) == PCI_EXP_TYPE_ROOT_PORT || + pci_pcie_type(pci_dev) == PCI_EXP_TYPE_RC_EC)) + pcie_clear_root_pme_status(pci_dev); +} + +static int pci_pm_suspend(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + pci_dev->skip_bus_pm = false; + + if (pci_has_legacy_pm_support(pci_dev)) + return pci_legacy_suspend(dev, PMSG_SUSPEND); + + if (!pm) { + pci_pm_default_suspend(pci_dev); + return 0; + } + + /* + * PCI devices suspended at run time may need to be resumed at this + * point, because in general it may be necessary to reconfigure them for + * system suspend. Namely, if the device is expected to wake up the + * system from the sleep state, it may have to be reconfigured for this + * purpose, or if the device is not expected to wake up the system from + * the sleep state, it should be prevented from signaling wakeup events + * going forward. + * + * Also if the driver of the device does not indicate that its system + * suspend callbacks can cope with runtime-suspended devices, it is + * better to resume the device from runtime suspend here. + */ + if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) || + pci_dev_need_resume(pci_dev)) { + pm_runtime_resume(dev); + pci_dev->state_saved = false; + } else { + pci_dev_adjust_pme(pci_dev); + } + + if (pm->suspend) { + pci_power_t prev = pci_dev->current_state; + int error; + + error = pm->suspend(dev); + suspend_report_result(pm->suspend, error); + if (error) + return error; + + if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 + && pci_dev->current_state != PCI_UNKNOWN) { + pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev, + "PCI PM: State of device not saved by %pS\n", + pm->suspend); + } + } + + return 0; +} + +static int pci_pm_suspend_late(struct device *dev) +{ + if (dev_pm_skip_suspend(dev)) + return 0; + + pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev)); + + return pm_generic_suspend_late(dev); +} + +static int pci_pm_suspend_noirq(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + if (dev_pm_skip_suspend(dev)) + return 0; + + if (pci_has_legacy_pm_support(pci_dev)) + return pci_legacy_suspend_late(dev, PMSG_SUSPEND); + + if (!pm) { + pci_save_state(pci_dev); + goto Fixup; + } + + if (pm->suspend_noirq) { + pci_power_t prev = pci_dev->current_state; + int error; + + error = pm->suspend_noirq(dev); + suspend_report_result(pm->suspend_noirq, error); + if (error) + return error; + + if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 + && pci_dev->current_state != PCI_UNKNOWN) { + pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev, + "PCI PM: State of device not saved by %pS\n", + pm->suspend_noirq); + goto Fixup; + } + } + + if (pci_dev->skip_bus_pm) { + /* + * Either the device is a bridge with a child in D0 below it, or + * the function is running for the second time in a row without + * going through full resume, which is possible only during + * suspend-to-idle in a spurious wakeup case. The device should + * be in D0 at this point, but if it is a bridge, it may be + * necessary to save its state. + */ + if (!pci_dev->state_saved) + pci_save_state(pci_dev); + } else if (!pci_dev->state_saved) { + pci_save_state(pci_dev); + if (pci_power_manageable(pci_dev)) + pci_prepare_to_sleep(pci_dev); + } + + pci_dbg(pci_dev, "PCI PM: Suspend power state: %s\n", + pci_power_name(pci_dev->current_state)); + + if (pci_dev->current_state == PCI_D0) { + pci_dev->skip_bus_pm = true; + /* + * Per PCI PM r1.2, table 6-1, a bridge must be in D0 if any + * downstream device is in D0, so avoid changing the power state + * of the parent bridge by setting the skip_bus_pm flag for it. + */ + if (pci_dev->bus->self) + pci_dev->bus->self->skip_bus_pm = true; + } + + if (pci_dev->skip_bus_pm && pm_suspend_no_platform()) { + pci_dbg(pci_dev, "PCI PM: Skipped\n"); + goto Fixup; + } + + pci_pm_set_unknown_state(pci_dev); + + /* + * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's + * PCI COMMAND register isn't 0, the BIOS assumes that the controller + * hasn't been quiesced and tries to turn it off. If the controller + * is already in D3, this can hang or cause memory corruption. + * + * Since the value of the COMMAND register doesn't matter once the + * device has been suspended, we can safely set it to 0 here. + */ + if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) + pci_write_config_word(pci_dev, PCI_COMMAND, 0); + +Fixup: + pci_fixup_device(pci_fixup_suspend_late, pci_dev); + + /* + * If the target system sleep state is suspend-to-idle, it is sufficient + * to check whether or not the device's wakeup settings are good for + * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause + * pci_pm_complete() to take care of fixing up the device's state + * anyway, if need be. + */ + if (device_can_wakeup(dev) && !device_may_wakeup(dev)) + dev->power.may_skip_resume = false; + + return 0; +} + +static int pci_pm_resume_noirq(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + pci_power_t prev_state = pci_dev->current_state; + bool skip_bus_pm = pci_dev->skip_bus_pm; + + if (dev_pm_skip_resume(dev)) + return 0; + + /* + * In the suspend-to-idle case, devices left in D0 during suspend will + * stay in D0, so it is not necessary to restore or update their + * configuration here and attempting to put them into D0 again is + * pointless, so avoid doing that. + */ + if (!(skip_bus_pm && pm_suspend_no_platform())) + pci_pm_default_resume_early(pci_dev); + + pci_fixup_device(pci_fixup_resume_early, pci_dev); + pcie_pme_root_status_cleanup(pci_dev); + + if (!skip_bus_pm && prev_state == PCI_D3cold) + pci_bridge_wait_for_secondary_bus(pci_dev, "resume", PCI_RESET_WAIT); + + if (pci_has_legacy_pm_support(pci_dev)) + return 0; + + if (pm && pm->resume_noirq) + return pm->resume_noirq(dev); + + return 0; +} + +static int pci_pm_resume_early(struct device *dev) +{ + if (dev_pm_skip_resume(dev)) + return 0; + + return pm_generic_resume_early(dev); +} + +static int pci_pm_resume(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + /* + * This is necessary for the suspend error path in which resume is + * called without restoring the standard config registers of the device. + */ + if (pci_dev->state_saved) + pci_restore_standard_config(pci_dev); + + if (pci_has_legacy_pm_support(pci_dev)) + return pci_legacy_resume(dev); + + pci_pm_default_resume(pci_dev); + + if (pm) { + if (pm->resume) + return pm->resume(dev); + } else { + pci_pm_reenable_device(pci_dev); + } + + return 0; +} + +#else /* !CONFIG_SUSPEND */ + +#define pci_pm_suspend NULL +#define pci_pm_suspend_late NULL +#define pci_pm_suspend_noirq NULL +#define pci_pm_resume NULL +#define pci_pm_resume_early NULL +#define pci_pm_resume_noirq NULL + +#endif /* !CONFIG_SUSPEND */ + +#ifdef CONFIG_HIBERNATE_CALLBACKS + +static int pci_pm_freeze(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + if (pci_has_legacy_pm_support(pci_dev)) + return pci_legacy_suspend(dev, PMSG_FREEZE); + + if (!pm) { + pci_pm_default_suspend(pci_dev); + return 0; + } + + /* + * Resume all runtime-suspended devices before creating a snapshot + * image of system memory, because the restore kernel generally cannot + * be expected to always handle them consistently and they need to be + * put into the runtime-active metastate during system resume anyway, + * so it is better to ensure that the state saved in the image will be + * always consistent with that. + */ + pm_runtime_resume(dev); + pci_dev->state_saved = false; + + if (pm->freeze) { + int error; + + error = pm->freeze(dev); + suspend_report_result(pm->freeze, error); + if (error) + return error; + } + + return 0; +} + +static int pci_pm_freeze_noirq(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + if (pci_has_legacy_pm_support(pci_dev)) + return pci_legacy_suspend_late(dev, PMSG_FREEZE); + + if (pm && pm->freeze_noirq) { + int error; + + error = pm->freeze_noirq(dev); + suspend_report_result(pm->freeze_noirq, error); + if (error) + return error; + } + + if (!pci_dev->state_saved) + pci_save_state(pci_dev); + + pci_pm_set_unknown_state(pci_dev); + + return 0; +} + +static int pci_pm_thaw_noirq(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + /* + * The pm->thaw_noirq() callback assumes the device has been + * returned to D0 and its config state has been restored. + * + * In addition, pci_restore_state() restores MSI-X state in MMIO + * space, which requires the device to be in D0, so return it to D0 + * in case the driver's "freeze" callbacks put it into a low-power + * state. + */ + pci_set_power_state(pci_dev, PCI_D0); + pci_restore_state(pci_dev); + + if (pci_has_legacy_pm_support(pci_dev)) + return 0; + + if (pm && pm->thaw_noirq) + return pm->thaw_noirq(dev); + + return 0; +} + +static int pci_pm_thaw(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + int error = 0; + + if (pci_has_legacy_pm_support(pci_dev)) + return pci_legacy_resume(dev); + + if (pm) { + if (pm->thaw) + error = pm->thaw(dev); + } else { + pci_pm_reenable_device(pci_dev); + } + + pci_dev->state_saved = false; + + return error; +} + +static int pci_pm_poweroff(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + if (pci_has_legacy_pm_support(pci_dev)) + return pci_legacy_suspend(dev, PMSG_HIBERNATE); + + if (!pm) { + pci_pm_default_suspend(pci_dev); + return 0; + } + + /* The reason to do that is the same as in pci_pm_suspend(). */ + if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) || + pci_dev_need_resume(pci_dev)) { + pm_runtime_resume(dev); + pci_dev->state_saved = false; + } else { + pci_dev_adjust_pme(pci_dev); + } + + if (pm->poweroff) { + int error; + + error = pm->poweroff(dev); + suspend_report_result(pm->poweroff, error); + if (error) + return error; + } + + return 0; +} + +static int pci_pm_poweroff_late(struct device *dev) +{ + if (dev_pm_skip_suspend(dev)) + return 0; + + pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev)); + + return pm_generic_poweroff_late(dev); +} + +static int pci_pm_poweroff_noirq(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + if (dev_pm_skip_suspend(dev)) + return 0; + + if (pci_has_legacy_pm_support(pci_dev)) + return pci_legacy_suspend_late(dev, PMSG_HIBERNATE); + + if (!pm) { + pci_fixup_device(pci_fixup_suspend_late, pci_dev); + return 0; + } + + if (pm->poweroff_noirq) { + int error; + + error = pm->poweroff_noirq(dev); + suspend_report_result(pm->poweroff_noirq, error); + if (error) + return error; + } + + if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev)) + pci_prepare_to_sleep(pci_dev); + + /* + * The reason for doing this here is the same as for the analogous code + * in pci_pm_suspend_noirq(). + */ + if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) + pci_write_config_word(pci_dev, PCI_COMMAND, 0); + + pci_fixup_device(pci_fixup_suspend_late, pci_dev); + + return 0; +} + +static int pci_pm_restore_noirq(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + pci_pm_default_resume_early(pci_dev); + pci_fixup_device(pci_fixup_resume_early, pci_dev); + + if (pci_has_legacy_pm_support(pci_dev)) + return 0; + + if (pm && pm->restore_noirq) + return pm->restore_noirq(dev); + + return 0; +} + +static int pci_pm_restore(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + /* + * This is necessary for the hibernation error path in which restore is + * called without restoring the standard config registers of the device. + */ + if (pci_dev->state_saved) + pci_restore_standard_config(pci_dev); + + if (pci_has_legacy_pm_support(pci_dev)) + return pci_legacy_resume(dev); + + pci_pm_default_resume(pci_dev); + + if (pm) { + if (pm->restore) + return pm->restore(dev); + } else { + pci_pm_reenable_device(pci_dev); + } + + return 0; +} + +#else /* !CONFIG_HIBERNATE_CALLBACKS */ + +#define pci_pm_freeze NULL +#define pci_pm_freeze_noirq NULL +#define pci_pm_thaw NULL +#define pci_pm_thaw_noirq NULL +#define pci_pm_poweroff NULL +#define pci_pm_poweroff_late NULL +#define pci_pm_poweroff_noirq NULL +#define pci_pm_restore NULL +#define pci_pm_restore_noirq NULL + +#endif /* !CONFIG_HIBERNATE_CALLBACKS */ + +#ifdef CONFIG_PM + +static int pci_pm_runtime_suspend(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + pci_power_t prev = pci_dev->current_state; + int error; + + /* + * If pci_dev->driver is not set (unbound), we leave the device in D0, + * but it may go to D3cold when the bridge above it runtime suspends. + * Save its config space in case that happens. + */ + if (!pci_dev->driver) { + pci_save_state(pci_dev); + return 0; + } + + pci_dev->state_saved = false; + if (pm && pm->runtime_suspend) { + error = pm->runtime_suspend(dev); + /* + * -EBUSY and -EAGAIN is used to request the runtime PM core + * to schedule a new suspend, so log the event only with debug + * log level. + */ + if (error == -EBUSY || error == -EAGAIN) { + pci_dbg(pci_dev, "can't suspend now (%ps returned %d)\n", + pm->runtime_suspend, error); + return error; + } else if (error) { + pci_err(pci_dev, "can't suspend (%ps returned %d)\n", + pm->runtime_suspend, error); + return error; + } + } + + pci_fixup_device(pci_fixup_suspend, pci_dev); + + if (pm && pm->runtime_suspend + && !pci_dev->state_saved && pci_dev->current_state != PCI_D0 + && pci_dev->current_state != PCI_UNKNOWN) { + pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev, + "PCI PM: State of device not saved by %pS\n", + pm->runtime_suspend); + return 0; + } + + if (!pci_dev->state_saved) { + pci_save_state(pci_dev); + pci_finish_runtime_suspend(pci_dev); + } + + return 0; +} + +static int pci_pm_runtime_resume(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + pci_power_t prev_state = pci_dev->current_state; + int error = 0; + + /* + * Restoring config space is necessary even if the device is not bound + * to a driver because although we left it in D0, it may have gone to + * D3cold when the bridge above it runtime suspended. + */ + pci_restore_standard_config(pci_dev); + + if (!pci_dev->driver) + return 0; + + pci_fixup_device(pci_fixup_resume_early, pci_dev); + pci_pm_default_resume(pci_dev); + + if (prev_state == PCI_D3cold) + pci_bridge_wait_for_secondary_bus(pci_dev, "resume", PCI_RESET_WAIT); + + if (pm && pm->runtime_resume) + error = pm->runtime_resume(dev); + + pci_dev->runtime_d3cold = false; + + return error; +} + +static int pci_pm_runtime_idle(struct device *dev) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + + /* + * If pci_dev->driver is not set (unbound), the device should + * always remain in D0 regardless of the runtime PM status + */ + if (!pci_dev->driver) + return 0; + + if (!pm) + return -ENOSYS; + + if (pm->runtime_idle) + return pm->runtime_idle(dev); + + return 0; +} + +static const struct dev_pm_ops pci_dev_pm_ops = { + .prepare = pci_pm_prepare, + .complete = pci_pm_complete, + .suspend = pci_pm_suspend, + .suspend_late = pci_pm_suspend_late, + .resume = pci_pm_resume, + .resume_early = pci_pm_resume_early, + .freeze = pci_pm_freeze, + .thaw = pci_pm_thaw, + .poweroff = pci_pm_poweroff, + .poweroff_late = pci_pm_poweroff_late, + .restore = pci_pm_restore, + .suspend_noirq = pci_pm_suspend_noirq, + .resume_noirq = pci_pm_resume_noirq, + .freeze_noirq = pci_pm_freeze_noirq, + .thaw_noirq = pci_pm_thaw_noirq, + .poweroff_noirq = pci_pm_poweroff_noirq, + .restore_noirq = pci_pm_restore_noirq, + .runtime_suspend = pci_pm_runtime_suspend, + .runtime_resume = pci_pm_runtime_resume, + .runtime_idle = pci_pm_runtime_idle, +}; + +#define PCI_PM_OPS_PTR (&pci_dev_pm_ops) + +#else /* !CONFIG_PM */ + +#define pci_pm_runtime_suspend NULL +#define pci_pm_runtime_resume NULL +#define pci_pm_runtime_idle NULL + +#define PCI_PM_OPS_PTR NULL + +#endif /* !CONFIG_PM */ + +/** + * __pci_register_driver - register a new pci driver + * @drv: the driver structure to register + * @owner: owner module of drv + * @mod_name: module name string + * + * Adds the driver structure to the list of registered drivers. + * Returns a negative value on error, otherwise 0. + * If no error occurred, the driver remains registered even if + * no device was claimed during registration. + */ +int __pci_register_driver(struct pci_driver *drv, struct module *owner, + const char *mod_name) +{ + /* initialize common driver fields */ + drv->driver.name = drv->name; + drv->driver.bus = &pci_bus_type; + drv->driver.owner = owner; + drv->driver.mod_name = mod_name; + drv->driver.groups = drv->groups; + + spin_lock_init(&drv->dynids.lock); + INIT_LIST_HEAD(&drv->dynids.list); + + /* register with core */ + return driver_register(&drv->driver); +} +EXPORT_SYMBOL(__pci_register_driver); + +/** + * pci_unregister_driver - unregister a pci driver + * @drv: the driver structure to unregister + * + * Deletes the driver structure from the list of registered PCI drivers, + * gives it a chance to clean up by calling its remove() function for + * each device it was responsible for, and marks those devices as + * driverless. + */ + +void pci_unregister_driver(struct pci_driver *drv) +{ + driver_unregister(&drv->driver); + pci_free_dynids(drv); +} +EXPORT_SYMBOL(pci_unregister_driver); + +static struct pci_driver pci_compat_driver = { + .name = "compat" +}; + +/** + * pci_dev_driver - get the pci_driver of a device + * @dev: the device to query + * + * Returns the appropriate pci_driver structure or %NULL if there is no + * registered driver for the device. + */ +struct pci_driver *pci_dev_driver(const struct pci_dev *dev) +{ + if (dev->driver) + return dev->driver; + else { + int i; + for (i = 0; i <= PCI_ROM_RESOURCE; i++) + if (dev->resource[i].flags & IORESOURCE_BUSY) + return &pci_compat_driver; + } + return NULL; +} +EXPORT_SYMBOL(pci_dev_driver); + +/** + * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure + * @dev: the PCI device structure to match against + * @drv: the device driver to search for matching PCI device id structures + * + * Used by a driver to check whether a PCI device present in the + * system is in its list of supported devices. Returns the matching + * pci_device_id structure or %NULL if there is no match. + */ +static int pci_bus_match(struct device *dev, struct device_driver *drv) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + struct pci_driver *pci_drv; + const struct pci_device_id *found_id; + + if (!pci_dev->match_driver) + return 0; + + pci_drv = to_pci_driver(drv); + found_id = pci_match_device(pci_drv, pci_dev); + if (found_id) + return 1; + + return 0; +} + +/** + * pci_dev_get - increments the reference count of the pci device structure + * @dev: the device being referenced + * + * Each live reference to a device should be refcounted. + * + * Drivers for PCI devices should normally record such references in + * their probe() methods, when they bind to a device, and release + * them by calling pci_dev_put(), in their disconnect() methods. + * + * A pointer to the device with the incremented reference counter is returned. + */ +struct pci_dev *pci_dev_get(struct pci_dev *dev) +{ + if (dev) + get_device(&dev->dev); + return dev; +} +EXPORT_SYMBOL(pci_dev_get); + +/** + * pci_dev_put - release a use of the pci device structure + * @dev: device that's been disconnected + * + * Must be called when a user of a device is finished with it. When the last + * user of the device calls this function, the memory of the device is freed. + */ +void pci_dev_put(struct pci_dev *dev) +{ + if (dev) + put_device(&dev->dev); +} +EXPORT_SYMBOL(pci_dev_put); + +static int pci_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + struct pci_dev *pdev; + + if (!dev) + return -ENODEV; + + pdev = to_pci_dev(dev); + + if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class)) + return -ENOMEM; + + if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device)) + return -ENOMEM; + + if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor, + pdev->subsystem_device)) + return -ENOMEM; + + if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev))) + return -ENOMEM; + + if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X", + pdev->vendor, pdev->device, + pdev->subsystem_vendor, pdev->subsystem_device, + (u8)(pdev->class >> 16), (u8)(pdev->class >> 8), + (u8)(pdev->class))) + return -ENOMEM; + + return 0; +} + +#if defined(CONFIG_PCIEPORTBUS) || defined(CONFIG_EEH) +/** + * pci_uevent_ers - emit a uevent during recovery path of PCI device + * @pdev: PCI device undergoing error recovery + * @err_type: type of error event + */ +void pci_uevent_ers(struct pci_dev *pdev, enum pci_ers_result err_type) +{ + int idx = 0; + char *envp[3]; + + switch (err_type) { + case PCI_ERS_RESULT_NONE: + case PCI_ERS_RESULT_CAN_RECOVER: + envp[idx++] = "ERROR_EVENT=BEGIN_RECOVERY"; + envp[idx++] = "DEVICE_ONLINE=0"; + break; + case PCI_ERS_RESULT_RECOVERED: + envp[idx++] = "ERROR_EVENT=SUCCESSFUL_RECOVERY"; + envp[idx++] = "DEVICE_ONLINE=1"; + break; + case PCI_ERS_RESULT_DISCONNECT: + envp[idx++] = "ERROR_EVENT=FAILED_RECOVERY"; + envp[idx++] = "DEVICE_ONLINE=0"; + break; + default: + break; + } + + if (idx > 0) { + envp[idx++] = NULL; + kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, envp); + } +} +#endif + +static int pci_bus_num_vf(struct device *dev) +{ + return pci_num_vf(to_pci_dev(dev)); +} + +/** + * pci_dma_configure - Setup DMA configuration + * @dev: ptr to dev structure + * + * Function to update PCI devices's DMA configuration using the same + * info from the OF node or ACPI node of host bridge's parent (if any). + */ +static int pci_dma_configure(struct device *dev) +{ + struct device *bridge; + int ret = 0; + + bridge = pci_get_host_bridge_device(to_pci_dev(dev)); + + if (IS_ENABLED(CONFIG_OF) && bridge->parent && + bridge->parent->of_node) { + ret = of_dma_configure(dev, bridge->parent->of_node, true); + } else if (has_acpi_companion(bridge)) { + struct acpi_device *adev = to_acpi_device_node(bridge->fwnode); + + ret = acpi_dma_configure(dev, acpi_get_dma_attr(adev)); + } + + pci_put_host_bridge_device(bridge); + return ret; +} + +struct bus_type pci_bus_type = { + .name = "pci", + .match = pci_bus_match, + .uevent = pci_uevent, + .probe = pci_device_probe, + .remove = pci_device_remove, + .shutdown = pci_device_shutdown, + .dev_groups = pci_dev_groups, + .bus_groups = pci_bus_groups, + .drv_groups = pci_drv_groups, + .pm = PCI_PM_OPS_PTR, + .num_vf = pci_bus_num_vf, + .dma_configure = pci_dma_configure, +}; +EXPORT_SYMBOL(pci_bus_type); + +#ifdef CONFIG_PCIEPORTBUS +static int pcie_port_bus_match(struct device *dev, struct device_driver *drv) +{ + struct pcie_device *pciedev; + struct pcie_port_service_driver *driver; + + if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type) + return 0; + + pciedev = to_pcie_device(dev); + driver = to_service_driver(drv); + + if (driver->service != pciedev->service) + return 0; + + if (driver->port_type != PCIE_ANY_PORT && + driver->port_type != pci_pcie_type(pciedev->port)) + return 0; + + return 1; +} + +struct bus_type pcie_port_bus_type = { + .name = "pci_express", + .match = pcie_port_bus_match, +}; +EXPORT_SYMBOL_GPL(pcie_port_bus_type); +#endif + +static int __init pci_driver_init(void) +{ + int ret; + + ret = bus_register(&pci_bus_type); + if (ret) + return ret; + +#ifdef CONFIG_PCIEPORTBUS + ret = bus_register(&pcie_port_bus_type); + if (ret) + return ret; +#endif + dma_debug_add_bus(&pci_bus_type); + return 0; +} +postcore_initcall(pci_driver_init); |