| // 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 <linux/iommu.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); |
| } |
| |
| /** |
| * 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 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 - See if a device matches a driver's list of IDs |
| * @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 is in its list of |
| * supported devices or in the dynids list, which may have been augmented |
| * via the sysfs "new_id" file. 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, *ids; |
| |
| /* 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) |
| return found_id; |
| |
| for (ids = drv->id_table; (found_id = pci_match_id(ids, dev)); |
| ids = found_id + 1) { |
| /* |
| * The match table is split based on driver_override. |
| * In case override_only was set, enforce driver_override |
| * matching. |
| */ |
| if (found_id->override_only) { |
| if (dev->driver_override) |
| return found_id; |
| } else { |
| return found_id; |
| } |
| } |
| |
| /* driver_override will always match, send a dummy id */ |
| if (dev->driver_override) |
| return &pci_device_id_any; |
| return NULL; |
| } |
| |
| /** |
| * new_id_store - 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_device(pdrv, 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); |
| |
| /** |
| * remove_id_store - 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); |
| |
| 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; |
| 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 { |
| cpumask_var_t wq_domain_mask; |
| |
| if (!zalloc_cpumask_var(&wq_domain_mask, GFP_KERNEL)) { |
| error = -ENOMEM; |
| goto out; |
| } |
| cpumask_and(wq_domain_mask, |
| housekeeping_cpumask(HK_TYPE_WQ), |
| housekeeping_cpumask(HK_TYPE_DOMAIN)); |
| |
| cpu = cpumask_any_and(cpumask_of_node(node), |
| wq_domain_mask); |
| free_cpumask_var(wq_domain_mask); |
| } |
| |
| if (cpu < nr_cpu_ids) |
| error = work_on_cpu(cpu, local_pci_probe, &ddi); |
| else |
| error = local_pci_probe(&ddi); |
| out: |
| 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 (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 void pci_device_remove(struct device *dev) |
| { |
| struct pci_dev *pci_dev = to_pci_dev(dev); |
| struct pci_driver *drv = pci_dev->driver; |
| |
| 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); |
| } |
| |
| 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_SLEEP |
| |
| /* Auxiliary functions used for system 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; |
| } |
| #endif /* CONFIG_PM_SLEEP */ |
| |
| #ifdef CONFIG_PM |
| |
| /* Auxiliary functions used for system resume and run-time resume */ |
| |
| 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); |
| } |
| |
| static void pci_pm_power_up_and_verify_state(struct pci_dev *pci_dev) |
| { |
| pci_power_up(pci_dev); |
| pci_update_current_state(pci_dev, PCI_D0); |
| } |
| |
| static void pci_pm_default_resume_early(struct pci_dev *pci_dev) |
| { |
| pci_pm_power_up_and_verify_state(pci_dev); |
| pci_restore_state(pci_dev); |
| pci_pme_restore(pci_dev); |
| } |
| |
| static void pci_pm_bridge_power_up_actions(struct pci_dev *pci_dev) |
| { |
| pci_bridge_wait_for_secondary_bus(pci_dev); |
| /* |
| * When powering on a bridge from D3cold, the whole hierarchy may be |
| * powered on into D0uninitialized state, resume them to give them a |
| * chance to suspend again |
| */ |
| pci_resume_bus(pci_dev->subordinate); |
| } |
| |
| #endif /* CONFIG_PM */ |
| |
| #ifdef CONFIG_PM_SLEEP |
| |
| /* |
| * 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, re-enable */ |
| 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(dev, 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; |
| |
| /* |
| * Disabling PTM allows some systems, e.g., Intel mobile chips |
| * since Coffee Lake, to enter a lower-power PM state. |
| */ |
| pci_suspend_ptm(pci_dev); |
| |
| 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(dev, 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(dev, 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->state_saved) { |
| pci_save_state(pci_dev); |
| |
| /* |
| * If the device is a bridge with a child in D0 below it, |
| * it needs to stay in D0, so check skip_bus_pm to avoid |
| * putting it into a low-power state in that case. |
| */ |
| if (!pci_dev->skip_bus_pm && 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_pm_bridge_power_up_actions(pci_dev); |
| |
| 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); |
| |
| pci_resume_ptm(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(dev, 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(dev, 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_pm_power_up_and_verify_state(pci_dev); |
| 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(dev, 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(dev, 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; |
| |
| pci_suspend_ptm(pci_dev); |
| |
| /* |
| * 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_pm_default_resume_early(pci_dev); |
| pci_resume_ptm(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_pm_bridge_power_up_actions(pci_dev); |
| |
| if (pm && pm->runtime_resume) |
| error = pm->runtime_resume(dev); |
| |
| 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; |
| drv->driver.dev_groups = drv->dev_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_PCIEAER) || 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 pci_driver *driver = to_pci_driver(dev->driver); |
| 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); |
| |
| if (!ret && !driver->driver_managed_dma) { |
| ret = iommu_device_use_default_domain(dev); |
| if (ret) |
| arch_teardown_dma_ops(dev); |
| } |
| |
| return ret; |
| } |
| |
| static void pci_dma_cleanup(struct device *dev) |
| { |
| struct pci_driver *driver = to_pci_driver(dev->driver); |
| |
| if (!driver->driver_managed_dma) |
| iommu_device_unuse_default_domain(dev); |
| } |
| |
| 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, |
| .dma_cleanup = pci_dma_cleanup, |
| }; |
| 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); |