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Diffstat (limited to 'include/linux/pci_hotplug.h')
| -rw-r--r-- | include/linux/pci_hotplug.h | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/include/linux/pci_hotplug.h b/include/linux/pci_hotplug.h new file mode 100644 index 000000000..3a10d6ec3 --- /dev/null +++ b/include/linux/pci_hotplug.h @@ -0,0 +1,111 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * PCI HotPlug Core Functions + * + * Copyright (C) 1995,2001 Compaq Computer Corporation + * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) + * Copyright (C) 2001 IBM Corp. + * + * All rights reserved. + * + * Send feedback to <kristen.c.accardi@intel.com> + * + */ +#ifndef _PCI_HOTPLUG_H +#define _PCI_HOTPLUG_H + +/** + * struct hotplug_slot_ops -the callbacks that the hotplug pci core can use + * @enable_slot: Called when the user wants to enable a specific pci slot + * @disable_slot: Called when the user wants to disable a specific pci slot + * @set_attention_status: Called to set the specific slot's attention LED to + * the specified value + * @hardware_test: Called to run a specified hardware test on the specified + * slot. + * @get_power_status: Called to get the current power status of a slot. + * @get_attention_status: Called to get the current attention status of a slot. + * @get_latch_status: Called to get the current latch status of a slot. + * @get_adapter_status: Called to get see if an adapter is present in the slot or not. + * @reset_slot: Optional interface to allow override of a bus reset for the + * slot for cases where a secondary bus reset can result in spurious + * hotplug events or where a slot can be reset independent of the bus. + * + * The table of function pointers that is passed to the hotplug pci core by a + * hotplug pci driver. These functions are called by the hotplug pci core when + * the user wants to do something to a specific slot (query it for information, + * set an LED, enable / disable power, etc.) + */ +struct hotplug_slot_ops { + int (*enable_slot) (struct hotplug_slot *slot); + int (*disable_slot) (struct hotplug_slot *slot); + int (*set_attention_status) (struct hotplug_slot *slot, u8 value); + int (*hardware_test) (struct hotplug_slot *slot, u32 value); + int (*get_power_status) (struct hotplug_slot *slot, u8 *value); + int (*get_attention_status) (struct hotplug_slot *slot, u8 *value); + int (*get_latch_status) (struct hotplug_slot *slot, u8 *value); + int (*get_adapter_status) (struct hotplug_slot *slot, u8 *value); + int (*reset_slot) (struct hotplug_slot *slot, bool probe); +}; + +/** + * struct hotplug_slot - used to register a physical slot with the hotplug pci core + * @ops: pointer to the &struct hotplug_slot_ops to be used for this slot + * @slot_list: internal list used to track hotplug PCI slots + * @pci_slot: represents a physical slot + * @owner: The module owner of this structure + * @mod_name: The module name (KBUILD_MODNAME) of this structure + */ +struct hotplug_slot { + const struct hotplug_slot_ops *ops; + + /* Variables below this are for use only by the hotplug pci core. */ + struct list_head slot_list; + struct pci_slot *pci_slot; + struct module *owner; + const char *mod_name; +}; + +static inline const char *hotplug_slot_name(const struct hotplug_slot *slot) +{ + return pci_slot_name(slot->pci_slot); +} + +int __pci_hp_register(struct hotplug_slot *slot, struct pci_bus *pbus, int nr, + const char *name, struct module *owner, + const char *mod_name); +int __pci_hp_initialize(struct hotplug_slot *slot, struct pci_bus *bus, int nr, + const char *name, struct module *owner, + const char *mod_name); +int pci_hp_add(struct hotplug_slot *slot); + +void pci_hp_del(struct hotplug_slot *slot); +void pci_hp_destroy(struct hotplug_slot *slot); +void pci_hp_deregister(struct hotplug_slot *slot); + +/* use a define to avoid include chaining to get THIS_MODULE & friends */ +#define pci_hp_register(slot, pbus, devnr, name) \ + __pci_hp_register(slot, pbus, devnr, name, THIS_MODULE, KBUILD_MODNAME) +#define pci_hp_initialize(slot, bus, nr, name) \ + __pci_hp_initialize(slot, bus, nr, name, THIS_MODULE, KBUILD_MODNAME) + +#ifdef CONFIG_ACPI +#include <linux/acpi.h> +bool pciehp_is_native(struct pci_dev *bridge); +int acpi_get_hp_hw_control_from_firmware(struct pci_dev *bridge); +bool shpchp_is_native(struct pci_dev *bridge); +int acpi_pci_check_ejectable(struct pci_bus *pbus, acpi_handle handle); +int acpi_pci_detect_ejectable(acpi_handle handle); +#else +static inline int acpi_get_hp_hw_control_from_firmware(struct pci_dev *bridge) +{ + return 0; +} +static inline bool pciehp_is_native(struct pci_dev *bridge) { return true; } +static inline bool shpchp_is_native(struct pci_dev *bridge) { return true; } +#endif + +static inline bool hotplug_is_native(struct pci_dev *bridge) +{ + return pciehp_is_native(bridge) || shpchp_is_native(bridge); +} +#endif |