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