// SPDX-License-Identifier: GPL-2.0+ /* * PCI Express Hot Plug Controller Driver * * Copyright (C) 1995,2001 Compaq Computer Corporation * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) * Copyright (C) 2001 IBM Corp. * Copyright (C) 2003-2004 Intel Corporation * * All rights reserved. * * Send feedback to , * * Authors: * Dan Zink * Greg Kroah-Hartman * Dely Sy " */ #include #include #include #include #include #include "pciehp.h" #include "../pci.h" /* Global variables */ bool pciehp_debug; bool pciehp_poll_mode; int pciehp_poll_time; /* * not really modular, but the easiest way to keep compat with existing * bootargs behaviour is to continue using module_param here. */ module_param(pciehp_debug, bool, 0644); module_param(pciehp_poll_mode, bool, 0644); module_param(pciehp_poll_time, int, 0644); MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not"); MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not"); MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds"); #define PCIE_MODULE_NAME "pciehp" static int set_attention_status(struct hotplug_slot *slot, u8 value); static int get_power_status(struct hotplug_slot *slot, u8 *value); static int get_latch_status(struct hotplug_slot *slot, u8 *value); static int get_adapter_status(struct hotplug_slot *slot, u8 *value); static int init_slot(struct controller *ctrl) { struct hotplug_slot *hotplug = NULL; struct hotplug_slot_info *info = NULL; struct hotplug_slot_ops *ops = NULL; char name[SLOT_NAME_SIZE]; int retval = -ENOMEM; hotplug = kzalloc(sizeof(*hotplug), GFP_KERNEL); if (!hotplug) goto out; info = kzalloc(sizeof(*info), GFP_KERNEL); if (!info) goto out; /* Setup hotplug slot ops */ ops = kzalloc(sizeof(*ops), GFP_KERNEL); if (!ops) goto out; ops->enable_slot = pciehp_sysfs_enable_slot; ops->disable_slot = pciehp_sysfs_disable_slot; ops->get_power_status = get_power_status; ops->get_adapter_status = get_adapter_status; ops->reset_slot = pciehp_reset_slot; if (MRL_SENS(ctrl)) ops->get_latch_status = get_latch_status; if (ATTN_LED(ctrl)) { ops->get_attention_status = pciehp_get_attention_status; ops->set_attention_status = set_attention_status; } else if (ctrl->pcie->port->hotplug_user_indicators) { ops->get_attention_status = pciehp_get_raw_indicator_status; ops->set_attention_status = pciehp_set_raw_indicator_status; } /* register this slot with the hotplug pci core */ hotplug->info = info; hotplug->private = ctrl; hotplug->ops = ops; ctrl->hotplug_slot = hotplug; snprintf(name, SLOT_NAME_SIZE, "%u", PSN(ctrl)); retval = pci_hp_initialize(hotplug, ctrl->pcie->port->subordinate, 0, name); if (retval) ctrl_err(ctrl, "pci_hp_initialize failed: error %d\n", retval); out: if (retval) { kfree(ops); kfree(info); kfree(hotplug); } return retval; } static void cleanup_slot(struct controller *ctrl) { struct hotplug_slot *hotplug_slot = ctrl->hotplug_slot; pci_hp_destroy(hotplug_slot); kfree(hotplug_slot->ops); kfree(hotplug_slot->info); kfree(hotplug_slot); } /* * set_attention_status - Turns the Amber LED for a slot on, off or blink */ static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) { struct controller *ctrl = hotplug_slot->private; struct pci_dev *pdev = ctrl->pcie->port; pci_config_pm_runtime_get(pdev); pciehp_set_attention_status(ctrl, status); pci_config_pm_runtime_put(pdev); return 0; } static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) { struct controller *ctrl = hotplug_slot->private; struct pci_dev *pdev = ctrl->pcie->port; pci_config_pm_runtime_get(pdev); pciehp_get_power_status(ctrl, value); pci_config_pm_runtime_put(pdev); return 0; } static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) { struct controller *ctrl = hotplug_slot->private; struct pci_dev *pdev = ctrl->pcie->port; pci_config_pm_runtime_get(pdev); pciehp_get_latch_status(ctrl, value); pci_config_pm_runtime_put(pdev); return 0; } static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) { struct controller *ctrl = hotplug_slot->private; struct pci_dev *pdev = ctrl->pcie->port; pci_config_pm_runtime_get(pdev); *value = pciehp_card_present_or_link_active(ctrl); pci_config_pm_runtime_put(pdev); return 0; } /** * pciehp_check_presence() - synthesize event if presence has changed * * On probe and resume, an explicit presence check is necessary to bring up an * occupied slot or bring down an unoccupied slot. This can't be triggered by * events in the Slot Status register, they may be stale and are therefore * cleared. Secondly, sending an interrupt for "events that occur while * interrupt generation is disabled [when] interrupt generation is subsequently * enabled" is optional per PCIe r4.0, sec 6.7.3.4. */ static void pciehp_check_presence(struct controller *ctrl) { bool occupied; down_read(&ctrl->reset_lock); mutex_lock(&ctrl->state_lock); occupied = pciehp_card_present_or_link_active(ctrl); if ((occupied && (ctrl->state == OFF_STATE || ctrl->state == BLINKINGON_STATE)) || (!occupied && (ctrl->state == ON_STATE || ctrl->state == BLINKINGOFF_STATE))) pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC); mutex_unlock(&ctrl->state_lock); up_read(&ctrl->reset_lock); } static int pciehp_probe(struct pcie_device *dev) { int rc; struct controller *ctrl; /* If this is not a "hotplug" service, we have no business here. */ if (dev->service != PCIE_PORT_SERVICE_HP) return -ENODEV; if (!dev->port->subordinate) { /* Can happen if we run out of bus numbers during probe */ dev_err(&dev->device, "Hotplug bridge without secondary bus, ignoring\n"); return -ENODEV; } ctrl = pcie_init(dev); if (!ctrl) { dev_err(&dev->device, "Controller initialization failed\n"); return -ENODEV; } set_service_data(dev, ctrl); /* Setup the slot information structures */ rc = init_slot(ctrl); if (rc) { if (rc == -EBUSY) ctrl_warn(ctrl, "Slot already registered by another hotplug driver\n"); else ctrl_err(ctrl, "Slot initialization failed (%d)\n", rc); goto err_out_release_ctlr; } /* Enable events after we have setup the data structures */ rc = pcie_init_notification(ctrl); if (rc) { ctrl_err(ctrl, "Notification initialization failed (%d)\n", rc); goto err_out_free_ctrl_slot; } /* Publish to user space */ rc = pci_hp_add(ctrl->hotplug_slot); if (rc) { ctrl_err(ctrl, "Publication to user space failed (%d)\n", rc); goto err_out_shutdown_notification; } pciehp_check_presence(ctrl); return 0; err_out_shutdown_notification: pcie_shutdown_notification(ctrl); err_out_free_ctrl_slot: cleanup_slot(ctrl); err_out_release_ctlr: pciehp_release_ctrl(ctrl); return -ENODEV; } static void pciehp_remove(struct pcie_device *dev) { struct controller *ctrl = get_service_data(dev); pci_hp_del(ctrl->hotplug_slot); pcie_shutdown_notification(ctrl); cleanup_slot(ctrl); pciehp_release_ctrl(ctrl); } #ifdef CONFIG_PM static int pciehp_suspend(struct pcie_device *dev) { return 0; } static int pciehp_resume_noirq(struct pcie_device *dev) { struct controller *ctrl = get_service_data(dev); /* pci_restore_state() just wrote to the Slot Control register */ ctrl->cmd_started = jiffies; ctrl->cmd_busy = true; /* clear spurious events from rediscovery of inserted card */ if (ctrl->state == ON_STATE || ctrl->state == BLINKINGOFF_STATE) pcie_clear_hotplug_events(ctrl); return 0; } static int pciehp_resume(struct pcie_device *dev) { struct controller *ctrl = get_service_data(dev); pciehp_check_presence(ctrl); return 0; } #endif /* PM */ static struct pcie_port_service_driver hpdriver_portdrv = { .name = PCIE_MODULE_NAME, .port_type = PCIE_ANY_PORT, .service = PCIE_PORT_SERVICE_HP, .probe = pciehp_probe, .remove = pciehp_remove, #ifdef CONFIG_PM .suspend = pciehp_suspend, .resume_noirq = pciehp_resume_noirq, .resume = pciehp_resume, #endif /* PM */ }; static int __init pcied_init(void) { int retval = 0; retval = pcie_port_service_register(&hpdriver_portdrv); dbg("pcie_port_service_register = %d\n", retval); if (retval) dbg("Failure to register service\n"); return retval; } device_initcall(pcied_init);