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c6b069e946
Current pciehp implementation disables and re-enables hotplug interrupts
in its interrupt handler. This operation might be intend to guarantee
that interrupts for the events newly occured during previous events are
being handled will be successfully generated. But current implementaion
has the following prolems.
- Current interrupt service routin clears status changes without
waiting command completion. Because of this, events might not be
cleared properly.
- Current interrupt service routine clears status changes caused by
disabling or enabling hotplug interrupts itself. This will lose new
events that occurs during previous interrupts are being handled.
- Current implementation doesn't have any serialization mechanism
between the code to wait for command completion and the interrupt
handler that clears the command completion events caused by itself.
There is clearly race conditions between them, and it may cause
the problem that waiting for command completion doesn't work for
example.
To fix those problems, this patch stops disabling/re-enabling hotplug
interrupts in interrupt service routine. Instead of this, this patch
re-inspects Slot Status register after clearing what is presumed to
be the last bending interrupt in order to guarantee that all interrupt
events are serviced.
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
216 lines
7.0 KiB
C
216 lines
7.0 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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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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#ifndef _PCIEHP_H
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#define _PCIEHP_H
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/pci_hotplug.h>
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#include <linux/delay.h>
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#include <linux/sched.h> /* signal_pending() */
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#include <linux/pcieport_if.h>
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#include <linux/mutex.h>
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#define MY_NAME "pciehp"
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extern int pciehp_poll_mode;
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extern int pciehp_poll_time;
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extern int pciehp_debug;
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extern int pciehp_force;
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extern struct workqueue_struct *pciehp_wq;
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#define dbg(format, arg...) \
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do { \
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if (pciehp_debug) \
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printk("%s: " format, MY_NAME , ## arg); \
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} while (0)
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#define err(format, arg...) \
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printk(KERN_ERR "%s: " format, MY_NAME , ## arg)
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#define info(format, arg...) \
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printk(KERN_INFO "%s: " format, MY_NAME , ## arg)
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#define warn(format, arg...) \
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printk(KERN_WARNING "%s: " format, MY_NAME , ## arg)
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#define SLOT_NAME_SIZE 10
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struct slot {
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u8 bus;
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u8 device;
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u32 number;
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u8 state;
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struct timer_list task_event;
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u8 hp_slot;
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struct controller *ctrl;
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struct hpc_ops *hpc_ops;
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struct hotplug_slot *hotplug_slot;
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struct list_head slot_list;
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char name[SLOT_NAME_SIZE];
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unsigned long last_emi_toggle;
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struct delayed_work work; /* work for button event */
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struct mutex lock;
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};
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struct event_info {
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u32 event_type;
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struct slot *p_slot;
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struct work_struct work;
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};
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struct controller {
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struct mutex crit_sect; /* critical section mutex */
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struct mutex ctrl_lock; /* controller lock */
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int num_slots; /* Number of slots on ctlr */
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int slot_num_inc; /* 1 or -1 */
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struct pci_dev *pci_dev;
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struct list_head slot_list;
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struct hpc_ops *hpc_ops;
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wait_queue_head_t queue; /* sleep & wake process */
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u8 slot_device_offset;
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u32 first_slot; /* First physical slot number */ /* PCIE only has 1 slot */
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u8 slot_bus; /* Bus where the slots handled by this controller sit */
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u8 ctrlcap;
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u8 cap_base;
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struct timer_list poll_timer;
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volatile int cmd_busy;
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};
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#define INT_BUTTON_IGNORE 0
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#define INT_PRESENCE_ON 1
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#define INT_PRESENCE_OFF 2
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#define INT_SWITCH_CLOSE 3
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#define INT_SWITCH_OPEN 4
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#define INT_POWER_FAULT 5
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#define INT_POWER_FAULT_CLEAR 6
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#define INT_BUTTON_PRESS 7
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#define INT_BUTTON_RELEASE 8
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#define INT_BUTTON_CANCEL 9
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#define STATIC_STATE 0
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#define BLINKINGON_STATE 1
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#define BLINKINGOFF_STATE 2
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#define POWERON_STATE 3
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#define POWEROFF_STATE 4
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/* Error messages */
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#define INTERLOCK_OPEN 0x00000002
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#define ADD_NOT_SUPPORTED 0x00000003
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#define CARD_FUNCTIONING 0x00000005
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#define ADAPTER_NOT_SAME 0x00000006
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#define NO_ADAPTER_PRESENT 0x00000009
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#define NOT_ENOUGH_RESOURCES 0x0000000B
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#define DEVICE_TYPE_NOT_SUPPORTED 0x0000000C
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#define WRONG_BUS_FREQUENCY 0x0000000D
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#define POWER_FAILURE 0x0000000E
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/* Field definitions in Slot Capabilities Register */
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#define ATTN_BUTTN_PRSN 0x00000001
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#define PWR_CTRL_PRSN 0x00000002
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#define MRL_SENS_PRSN 0x00000004
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#define ATTN_LED_PRSN 0x00000008
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#define PWR_LED_PRSN 0x00000010
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#define HP_SUPR_RM_SUP 0x00000020
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#define EMI_PRSN 0x00020000
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#define ATTN_BUTTN(cap) (cap & ATTN_BUTTN_PRSN)
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#define POWER_CTRL(cap) (cap & PWR_CTRL_PRSN)
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#define MRL_SENS(cap) (cap & MRL_SENS_PRSN)
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#define ATTN_LED(cap) (cap & ATTN_LED_PRSN)
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#define PWR_LED(cap) (cap & PWR_LED_PRSN)
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#define HP_SUPR_RM(cap) (cap & HP_SUPR_RM_SUP)
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#define EMI(cap) (cap & EMI_PRSN)
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extern int pciehp_sysfs_enable_slot(struct slot *slot);
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extern int pciehp_sysfs_disable_slot(struct slot *slot);
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extern u8 pciehp_handle_attention_button(u8 hp_slot, struct controller *ctrl);
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extern u8 pciehp_handle_switch_change(u8 hp_slot, struct controller *ctrl);
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extern u8 pciehp_handle_presence_change(u8 hp_slot, struct controller *ctrl);
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extern u8 pciehp_handle_power_fault(u8 hp_slot, struct controller *ctrl);
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extern int pciehp_configure_device(struct slot *p_slot);
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extern int pciehp_unconfigure_device(struct slot *p_slot);
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extern void pciehp_queue_pushbutton_work(struct work_struct *work);
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int pcie_init(struct controller *ctrl, struct pcie_device *dev);
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int pciehp_enable_slot(struct slot *p_slot);
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int pciehp_disable_slot(struct slot *p_slot);
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int pcie_init_hardware_part2(struct controller *ctrl, struct pcie_device *dev);
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static inline struct slot *pciehp_find_slot(struct controller *ctrl, u8 device)
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{
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struct slot *slot;
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list_for_each_entry(slot, &ctrl->slot_list, slot_list) {
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if (slot->device == device)
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return slot;
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}
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err("%s: slot (device=0x%x) not found\n", __func__, device);
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return NULL;
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}
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struct hpc_ops {
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int (*power_on_slot)(struct slot *slot);
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int (*power_off_slot)(struct slot *slot);
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int (*get_power_status)(struct slot *slot, u8 *status);
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int (*get_attention_status)(struct slot *slot, u8 *status);
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int (*set_attention_status)(struct slot *slot, u8 status);
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int (*get_latch_status)(struct slot *slot, u8 *status);
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int (*get_adapter_status)(struct slot *slot, u8 *status);
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int (*get_emi_status)(struct slot *slot, u8 *status);
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int (*toggle_emi)(struct slot *slot);
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int (*get_max_bus_speed)(struct slot *slot, enum pci_bus_speed *speed);
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int (*get_cur_bus_speed)(struct slot *slot, enum pci_bus_speed *speed);
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int (*get_max_lnk_width)(struct slot *slot, enum pcie_link_width *val);
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int (*get_cur_lnk_width)(struct slot *slot, enum pcie_link_width *val);
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int (*query_power_fault)(struct slot *slot);
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void (*green_led_on)(struct slot *slot);
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void (*green_led_off)(struct slot *slot);
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void (*green_led_blink)(struct slot *slot);
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void (*release_ctlr)(struct controller *ctrl);
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int (*check_lnk_status)(struct controller *ctrl);
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};
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#ifdef CONFIG_ACPI
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#include <acpi/acpi.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/actypes.h>
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#include <linux/pci-acpi.h>
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#define pciehp_get_hp_hw_control_from_firmware(dev) \
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pciehp_acpi_get_hp_hw_control_from_firmware(dev)
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static inline int pciehp_get_hp_params_from_firmware(struct pci_dev *dev,
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struct hotplug_params *hpp)
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{
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if (ACPI_FAILURE(acpi_get_hp_params_from_firmware(dev->bus, hpp)))
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return -ENODEV;
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return 0;
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}
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#else
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#define pciehp_get_hp_hw_control_from_firmware(dev) 0
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#define pciehp_get_hp_params_from_firmware(dev, hpp) (-ENODEV)
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#endif /* CONFIG_ACPI */
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#endif /* _PCIEHP_H */
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