include/linux/pci_hotplug.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * PCI HotPlug Core Functions
   4  *
   5  * Copyright (C) 1995,2001 Compaq Computer Corporation
   6  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
   7  * Copyright (C) 2001 IBM Corp.
   8  *
   9  * All rights reserved.
  10  *
  11  * Send feedback to <kristen.c.accardi@intel.com>
  12  *
  13  */
  14 #ifndef _PCI_HOTPLUG_H
  15 #define _PCI_HOTPLUG_H
  16
  17 /**
  18  * struct hotplug_slot_ops -the callbacks that the hotplug pci core can use
  19  * @enable_slot: Called when the user wants to enable a specific pci slot
  20  * @disable_slot: Called when the user wants to disable a specific pci slot
  21  * @set_attention_status: Called to set the specific slot's attention LED to
  22  * the specified value
  23  * @hardware_test: Called to run a specified hardware test on the specified
  24  * slot.
  25  * @get_power_status: Called to get the current power status of a slot.
  26  * @get_attention_status: Called to get the current attention status of a slot.
  27  * @get_latch_status: Called to get the current latch status of a slot.
  28  * @get_adapter_status: Called to get see if an adapter is present in the slot or not.
  29  * @reset_slot: Optional interface to allow override of a bus reset for the
  30  *      slot for cases where a secondary bus reset can result in spurious
  31  *      hotplug events or where a slot can be reset independent of the bus.
  32  *
  33  * The table of function pointers that is passed to the hotplug pci core by a
  34  * hotplug pci driver.  These functions are called by the hotplug pci core when
  35  * the user wants to do something to a specific slot (query it for information,
  36  * set an LED, enable / disable power, etc.)
  37  */
  38 struct hotplug_slot_ops {
  39         int (*enable_slot)              (struct hotplug_slot *slot);
  40         int (*disable_slot)             (struct hotplug_slot *slot);
  41         int (*set_attention_status)     (struct hotplug_slot *slot, u8 value);
  42         int (*hardware_test)            (struct hotplug_slot *slot, u32 value);
  43         int (*get_power_status)         (struct hotplug_slot *slot, u8 *value);
  44         int (*get_attention_status)     (struct hotplug_slot *slot, u8 *value);
  45         int (*get_latch_status)         (struct hotplug_slot *slot, u8 *value);
  46         int (*get_adapter_status)       (struct hotplug_slot *slot, u8 *value);
  47         int (*reset_slot)               (struct hotplug_slot *slot, int probe);
  48 };
  49
  50 /**
  51  * struct hotplug_slot - used to register a physical slot with the hotplug pci core
  52  * @ops: pointer to the &struct hotplug_slot_ops to be used for this slot
  53  * @owner: The module owner of this structure
  54  * @mod_name: The module name (KBUILD_MODNAME) of this structure
  55  */
  56 struct hotplug_slot {
  57         const struct hotplug_slot_ops   *ops;
  58
  59         /* Variables below this are for use only by the hotplug pci core. */
  60         struct list_head                slot_list;
  61         struct pci_slot                 *pci_slot;
  62         struct module                   *owner;
  63         const char                      *mod_name;
  64 };
  65
  66 static inline const char *hotplug_slot_name(const struct hotplug_slot *slot)
  67 {
  68         return pci_slot_name(slot->pci_slot);
  69 }
  70
  71 int __pci_hp_register(struct hotplug_slot *slot, struct pci_bus *pbus, int nr,
  72                       const char *name, struct module *owner,
  73                       const char *mod_name);
  74 int __pci_hp_initialize(struct hotplug_slot *slot, struct pci_bus *bus, int nr,
  75                         const char *name, struct module *owner,
  76                         const char *mod_name);
  77 int pci_hp_add(struct hotplug_slot *slot);
  78
  79 void pci_hp_del(struct hotplug_slot *slot);
  80 void pci_hp_destroy(struct hotplug_slot *slot);
  81 void pci_hp_deregister(struct hotplug_slot *slot);
  82
  83 /* use a define to avoid include chaining to get THIS_MODULE & friends */
  84 #define pci_hp_register(slot, pbus, devnr, name) \
  85         __pci_hp_register(slot, pbus, devnr, name, THIS_MODULE, KBUILD_MODNAME)
  86 #define pci_hp_initialize(slot, bus, nr, name) \
  87         __pci_hp_initialize(slot, bus, nr, name, THIS_MODULE, KBUILD_MODNAME)
  88
  89 #ifdef CONFIG_ACPI
  90 #include <linux/acpi.h>
  91 bool pciehp_is_native(struct pci_dev *bridge);
  92 int acpi_get_hp_hw_control_from_firmware(struct pci_dev *bridge);
  93 bool shpchp_is_native(struct pci_dev *bridge);
  94 int acpi_pci_check_ejectable(struct pci_bus *pbus, acpi_handle handle);
  95 int acpi_pci_detect_ejectable(acpi_handle handle);
  96 #else
  97 static inline int acpi_get_hp_hw_control_from_firmware(struct pci_dev *bridge)
  98 {
  99         return 0;
 100 }
 101 static inline bool pciehp_is_native(struct pci_dev *bridge) { return true; }
 102 static inline bool shpchp_is_native(struct pci_dev *bridge) { return true; }
 103 #endif
 104
 105 static inline bool hotplug_is_native(struct pci_dev *bridge)
 106 {
 107         return pciehp_is_native(bridge) || shpchp_is_native(bridge);
 108 }
 109 #endif