503 lines
12 KiB
C
503 lines
12 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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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/pci.h>
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#include "../pci.h"
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#include "pciehp.h"
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static void interrupt_event_handler(struct work_struct *work);
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void pciehp_queue_interrupt_event(struct slot *p_slot, u32 event_type)
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{
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struct event_info *info;
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info = kmalloc(sizeof(*info), GFP_ATOMIC);
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if (!info) {
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ctrl_err(p_slot->ctrl, "dropped event %d (ENOMEM)\n", event_type);
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return;
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}
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INIT_WORK(&info->work, interrupt_event_handler);
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info->event_type = event_type;
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info->p_slot = p_slot;
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queue_work(p_slot->wq, &info->work);
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}
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/* The following routines constitute the bulk of the
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hotplug controller logic
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*/
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static void set_slot_off(struct controller *ctrl, struct slot *pslot)
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{
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/* turn off slot, turn on Amber LED, turn off Green LED if supported*/
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if (POWER_CTRL(ctrl)) {
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pciehp_power_off_slot(pslot);
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/*
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* After turning power off, we must wait for at least 1 second
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* before taking any action that relies on power having been
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* removed from the slot/adapter.
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*/
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msleep(1000);
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}
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pciehp_green_led_off(pslot);
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pciehp_set_attention_status(pslot, 1);
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}
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/**
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* board_added - Called after a board has been added to the system.
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* @p_slot: &slot where board is added
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*
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* Turns power on for the board.
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* Configures board.
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*/
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static int board_added(struct slot *p_slot)
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{
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int retval = 0;
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struct controller *ctrl = p_slot->ctrl;
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struct pci_bus *parent = ctrl->pcie->port->subordinate;
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if (POWER_CTRL(ctrl)) {
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/* Power on slot */
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retval = pciehp_power_on_slot(p_slot);
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if (retval)
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return retval;
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}
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pciehp_green_led_blink(p_slot);
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/* Check link training status */
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retval = pciehp_check_link_status(ctrl);
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if (retval) {
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ctrl_err(ctrl, "Failed to check link status\n");
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goto err_exit;
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}
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/* Check for a power fault */
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if (ctrl->power_fault_detected || pciehp_query_power_fault(p_slot)) {
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ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(p_slot));
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retval = -EIO;
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goto err_exit;
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}
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retval = pciehp_configure_device(p_slot);
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if (retval) {
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if (retval != -EEXIST) {
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ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
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pci_domain_nr(parent), parent->number);
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goto err_exit;
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}
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}
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pciehp_green_led_on(p_slot);
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pciehp_set_attention_status(p_slot, 0);
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return 0;
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err_exit:
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set_slot_off(ctrl, p_slot);
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return retval;
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}
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/**
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* remove_board - Turns off slot and LEDs
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* @p_slot: slot where board is being removed
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*/
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static int remove_board(struct slot *p_slot)
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{
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int retval;
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struct controller *ctrl = p_slot->ctrl;
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retval = pciehp_unconfigure_device(p_slot);
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if (retval)
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return retval;
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if (POWER_CTRL(ctrl)) {
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pciehp_power_off_slot(p_slot);
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/*
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* After turning power off, we must wait for at least 1 second
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* before taking any action that relies on power having been
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* removed from the slot/adapter.
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*/
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msleep(1000);
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}
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/* turn off Green LED */
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pciehp_green_led_off(p_slot);
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return 0;
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}
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struct power_work_info {
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struct slot *p_slot;
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struct work_struct work;
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unsigned int req;
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#define DISABLE_REQ 0
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#define ENABLE_REQ 1
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};
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/**
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* pciehp_power_thread - handle pushbutton events
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* @work: &struct work_struct describing work to be done
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*
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* Scheduled procedure to handle blocking stuff for the pushbuttons.
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* Handles all pending events and exits.
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*/
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static void pciehp_power_thread(struct work_struct *work)
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{
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struct power_work_info *info =
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container_of(work, struct power_work_info, work);
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struct slot *p_slot = info->p_slot;
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int ret;
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switch (info->req) {
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case DISABLE_REQ:
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mutex_lock(&p_slot->hotplug_lock);
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pciehp_disable_slot(p_slot);
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mutex_unlock(&p_slot->hotplug_lock);
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mutex_lock(&p_slot->lock);
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p_slot->state = STATIC_STATE;
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mutex_unlock(&p_slot->lock);
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break;
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case ENABLE_REQ:
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mutex_lock(&p_slot->hotplug_lock);
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ret = pciehp_enable_slot(p_slot);
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mutex_unlock(&p_slot->hotplug_lock);
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if (ret)
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pciehp_green_led_off(p_slot);
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mutex_lock(&p_slot->lock);
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p_slot->state = STATIC_STATE;
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mutex_unlock(&p_slot->lock);
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break;
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default:
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break;
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}
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kfree(info);
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}
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static void pciehp_queue_power_work(struct slot *p_slot, int req)
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{
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struct power_work_info *info;
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p_slot->state = (req == ENABLE_REQ) ? POWERON_STATE : POWEROFF_STATE;
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info = kmalloc(sizeof(*info), GFP_KERNEL);
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if (!info) {
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ctrl_err(p_slot->ctrl, "no memory to queue %s request\n",
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(req == ENABLE_REQ) ? "poweron" : "poweroff");
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return;
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}
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info->p_slot = p_slot;
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INIT_WORK(&info->work, pciehp_power_thread);
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info->req = req;
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queue_work(p_slot->wq, &info->work);
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}
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void pciehp_queue_pushbutton_work(struct work_struct *work)
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{
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struct slot *p_slot = container_of(work, struct slot, work.work);
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mutex_lock(&p_slot->lock);
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switch (p_slot->state) {
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case BLINKINGOFF_STATE:
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pciehp_queue_power_work(p_slot, DISABLE_REQ);
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break;
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case BLINKINGON_STATE:
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pciehp_queue_power_work(p_slot, ENABLE_REQ);
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break;
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default:
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break;
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}
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mutex_unlock(&p_slot->lock);
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}
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/*
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* Note: This function must be called with slot->lock held
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*/
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static void handle_button_press_event(struct slot *p_slot)
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{
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struct controller *ctrl = p_slot->ctrl;
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u8 getstatus;
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switch (p_slot->state) {
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case STATIC_STATE:
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pciehp_get_power_status(p_slot, &getstatus);
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if (getstatus) {
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p_slot->state = BLINKINGOFF_STATE;
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ctrl_info(ctrl, "Slot(%s): Powering off due to button press\n",
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slot_name(p_slot));
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} else {
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p_slot->state = BLINKINGON_STATE;
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ctrl_info(ctrl, "Slot(%s) Powering on due to button press\n",
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slot_name(p_slot));
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}
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/* blink green LED and turn off amber */
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pciehp_green_led_blink(p_slot);
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pciehp_set_attention_status(p_slot, 0);
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queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ);
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break;
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case BLINKINGOFF_STATE:
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case BLINKINGON_STATE:
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/*
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* Cancel if we are still blinking; this means that we
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* press the attention again before the 5 sec. limit
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* expires to cancel hot-add or hot-remove
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*/
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ctrl_info(ctrl, "Slot(%s): Button cancel\n", slot_name(p_slot));
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cancel_delayed_work(&p_slot->work);
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if (p_slot->state == BLINKINGOFF_STATE)
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pciehp_green_led_on(p_slot);
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else
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pciehp_green_led_off(p_slot);
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pciehp_set_attention_status(p_slot, 0);
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ctrl_info(ctrl, "Slot(%s): Action canceled due to button press\n",
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slot_name(p_slot));
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p_slot->state = STATIC_STATE;
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break;
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case POWEROFF_STATE:
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case POWERON_STATE:
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/*
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* Ignore if the slot is on power-on or power-off state;
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* this means that the previous attention button action
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* to hot-add or hot-remove is undergoing
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*/
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ctrl_info(ctrl, "Slot(%s): Button ignored\n",
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slot_name(p_slot));
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break;
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default:
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ctrl_err(ctrl, "Slot(%s): Ignoring invalid state %#x\n",
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slot_name(p_slot), p_slot->state);
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break;
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}
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}
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/*
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* Note: This function must be called with slot->lock held
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*/
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static void handle_link_event(struct slot *p_slot, u32 event)
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{
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struct controller *ctrl = p_slot->ctrl;
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switch (p_slot->state) {
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case BLINKINGON_STATE:
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case BLINKINGOFF_STATE:
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cancel_delayed_work(&p_slot->work);
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/* Fall through */
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case STATIC_STATE:
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pciehp_queue_power_work(p_slot, event == INT_LINK_UP ?
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ENABLE_REQ : DISABLE_REQ);
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break;
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case POWERON_STATE:
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if (event == INT_LINK_UP) {
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ctrl_info(ctrl, "Slot(%s): Link Up event ignored; already powering on\n",
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slot_name(p_slot));
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} else {
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ctrl_info(ctrl, "Slot(%s): Link Down event queued; currently getting powered on\n",
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slot_name(p_slot));
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pciehp_queue_power_work(p_slot, DISABLE_REQ);
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}
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break;
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case POWEROFF_STATE:
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if (event == INT_LINK_UP) {
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ctrl_info(ctrl, "Slot(%s): Link Up event queued; currently getting powered off\n",
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slot_name(p_slot));
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pciehp_queue_power_work(p_slot, ENABLE_REQ);
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} else {
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ctrl_info(ctrl, "Slot(%s): Link Down event ignored; already powering off\n",
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slot_name(p_slot));
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}
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break;
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default:
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ctrl_err(ctrl, "Slot(%s): Ignoring invalid state %#x\n",
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slot_name(p_slot), p_slot->state);
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break;
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}
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}
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static void interrupt_event_handler(struct work_struct *work)
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{
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struct event_info *info = container_of(work, struct event_info, work);
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struct slot *p_slot = info->p_slot;
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struct controller *ctrl = p_slot->ctrl;
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mutex_lock(&p_slot->lock);
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switch (info->event_type) {
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case INT_BUTTON_PRESS:
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handle_button_press_event(p_slot);
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break;
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case INT_POWER_FAULT:
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if (!POWER_CTRL(ctrl))
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break;
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pciehp_set_attention_status(p_slot, 1);
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pciehp_green_led_off(p_slot);
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break;
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case INT_PRESENCE_ON:
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pciehp_queue_power_work(p_slot, ENABLE_REQ);
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break;
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case INT_PRESENCE_OFF:
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/*
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* Regardless of surprise capability, we need to
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* definitely remove a card that has been pulled out!
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*/
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pciehp_queue_power_work(p_slot, DISABLE_REQ);
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break;
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case INT_LINK_UP:
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case INT_LINK_DOWN:
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handle_link_event(p_slot, info->event_type);
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break;
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default:
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break;
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}
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mutex_unlock(&p_slot->lock);
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kfree(info);
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}
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/*
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* Note: This function must be called with slot->hotplug_lock held
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*/
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int pciehp_enable_slot(struct slot *p_slot)
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{
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u8 getstatus = 0;
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struct controller *ctrl = p_slot->ctrl;
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pciehp_get_adapter_status(p_slot, &getstatus);
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if (!getstatus) {
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ctrl_info(ctrl, "Slot(%s): No adapter\n", slot_name(p_slot));
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return -ENODEV;
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}
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if (MRL_SENS(p_slot->ctrl)) {
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pciehp_get_latch_status(p_slot, &getstatus);
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if (getstatus) {
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ctrl_info(ctrl, "Slot(%s): Latch open\n",
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slot_name(p_slot));
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return -ENODEV;
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}
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}
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if (POWER_CTRL(p_slot->ctrl)) {
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pciehp_get_power_status(p_slot, &getstatus);
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if (getstatus) {
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ctrl_info(ctrl, "Slot(%s): Already enabled\n",
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slot_name(p_slot));
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return 0;
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}
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}
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return board_added(p_slot);
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}
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/*
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* Note: This function must be called with slot->hotplug_lock held
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*/
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int pciehp_disable_slot(struct slot *p_slot)
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{
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u8 getstatus = 0;
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struct controller *ctrl = p_slot->ctrl;
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if (!p_slot->ctrl)
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return 1;
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if (POWER_CTRL(p_slot->ctrl)) {
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pciehp_get_power_status(p_slot, &getstatus);
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if (!getstatus) {
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ctrl_info(ctrl, "Slot(%s): Already disabled\n",
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slot_name(p_slot));
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return -EINVAL;
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}
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}
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return remove_board(p_slot);
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}
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int pciehp_sysfs_enable_slot(struct slot *p_slot)
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{
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int retval = -ENODEV;
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struct controller *ctrl = p_slot->ctrl;
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mutex_lock(&p_slot->lock);
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switch (p_slot->state) {
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case BLINKINGON_STATE:
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cancel_delayed_work(&p_slot->work);
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case STATIC_STATE:
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p_slot->state = POWERON_STATE;
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mutex_unlock(&p_slot->lock);
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mutex_lock(&p_slot->hotplug_lock);
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retval = pciehp_enable_slot(p_slot);
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mutex_unlock(&p_slot->hotplug_lock);
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mutex_lock(&p_slot->lock);
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p_slot->state = STATIC_STATE;
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break;
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case POWERON_STATE:
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ctrl_info(ctrl, "Slot(%s): Already in powering on state\n",
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slot_name(p_slot));
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break;
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case BLINKINGOFF_STATE:
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case POWEROFF_STATE:
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ctrl_info(ctrl, "Slot(%s): Already enabled\n",
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slot_name(p_slot));
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break;
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default:
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ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
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slot_name(p_slot), p_slot->state);
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break;
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}
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mutex_unlock(&p_slot->lock);
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return retval;
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}
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int pciehp_sysfs_disable_slot(struct slot *p_slot)
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{
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int retval = -ENODEV;
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struct controller *ctrl = p_slot->ctrl;
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mutex_lock(&p_slot->lock);
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switch (p_slot->state) {
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case BLINKINGOFF_STATE:
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cancel_delayed_work(&p_slot->work);
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case STATIC_STATE:
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p_slot->state = POWEROFF_STATE;
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mutex_unlock(&p_slot->lock);
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mutex_lock(&p_slot->hotplug_lock);
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retval = pciehp_disable_slot(p_slot);
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mutex_unlock(&p_slot->hotplug_lock);
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mutex_lock(&p_slot->lock);
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p_slot->state = STATIC_STATE;
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break;
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case POWEROFF_STATE:
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ctrl_info(ctrl, "Slot(%s): Already in powering off state\n",
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slot_name(p_slot));
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break;
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case BLINKINGON_STATE:
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case POWERON_STATE:
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ctrl_info(ctrl, "Slot(%s): Already disabled\n",
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slot_name(p_slot));
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break;
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default:
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ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
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slot_name(p_slot), p_slot->state);
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break;
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}
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mutex_unlock(&p_slot->lock);
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return retval;
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}
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