v4.19.13 snapshot.
diff --git a/include/linux/pci_hotplug.h b/include/linux/pci_hotplug.h
new file mode 100644
index 0000000..a6d6650
--- /dev/null
+++ b/include/linux/pci_hotplug.h
@@ -0,0 +1,196 @@
+/* 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
+ * @owner: The module owner of this structure
+ * @mod_name: The module name (KBUILD_MODNAME) of this structure
+ * @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.
+ * If this field is NULL, the value passed in the struct hotplug_slot_info
+ * will be used when this value is requested by a user.
+ * @get_attention_status: Called to get the current attention status of a slot.
+ * If this field is NULL, the value passed in the struct hotplug_slot_info
+ * will be used when this value is requested by a user.
+ * @get_latch_status: Called to get the current latch status of a slot.
+ * If this field is NULL, the value passed in the struct hotplug_slot_info
+ * will be used when this value is requested by a user.
+ * @get_adapter_status: Called to get see if an adapter is present in the slot or not.
+ * If this field is NULL, the value passed in the struct hotplug_slot_info
+ * will be used when this value is requested by a user.
+ * @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 {
+ struct module *owner;
+ const char *mod_name;
+ 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, int probe);
+};
+
+/**
+ * struct hotplug_slot_info - used to notify the hotplug pci core of the state of the slot
+ * @power_status: if power is enabled or not (1/0)
+ * @attention_status: if the attention light is enabled or not (1/0)
+ * @latch_status: if the latch (if any) is open or closed (1/0)
+ * @adapter_status: if there is a pci board present in the slot or not (1/0)
+ *
+ * Used to notify the hotplug pci core of the status of a specific slot.
+ */
+struct hotplug_slot_info {
+ u8 power_status;
+ u8 attention_status;
+ u8 latch_status;
+ u8 adapter_status;
+};
+
+/**
+ * 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
+ * @info: pointer to the &struct hotplug_slot_info for the initial values for
+ * this slot.
+ * @private: used by the hotplug pci controller driver to store whatever it
+ * needs.
+ */
+struct hotplug_slot {
+ struct hotplug_slot_ops *ops;
+ struct hotplug_slot_info *info;
+ void *private;
+
+ /* Variables below this are for use only by the hotplug pci core. */
+ struct list_head slot_list;
+ struct pci_slot *pci_slot;
+};
+
+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);
+
+int __must_check pci_hp_change_slot_info(struct hotplug_slot *slot,
+ struct hotplug_slot_info *info);
+
+/* 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)
+
+/* PCI Setting Record (Type 0) */
+struct hpp_type0 {
+ u32 revision;
+ u8 cache_line_size;
+ u8 latency_timer;
+ u8 enable_serr;
+ u8 enable_perr;
+};
+
+/* PCI-X Setting Record (Type 1) */
+struct hpp_type1 {
+ u32 revision;
+ u8 max_mem_read;
+ u8 avg_max_split;
+ u16 tot_max_split;
+};
+
+/* PCI Express Setting Record (Type 2) */
+struct hpp_type2 {
+ u32 revision;
+ u32 unc_err_mask_and;
+ u32 unc_err_mask_or;
+ u32 unc_err_sever_and;
+ u32 unc_err_sever_or;
+ u32 cor_err_mask_and;
+ u32 cor_err_mask_or;
+ u32 adv_err_cap_and;
+ u32 adv_err_cap_or;
+ u16 pci_exp_devctl_and;
+ u16 pci_exp_devctl_or;
+ u16 pci_exp_lnkctl_and;
+ u16 pci_exp_lnkctl_or;
+ u32 sec_unc_err_sever_and;
+ u32 sec_unc_err_sever_or;
+ u32 sec_unc_err_mask_and;
+ u32 sec_unc_err_mask_or;
+};
+
+struct hotplug_params {
+ struct hpp_type0 *t0; /* Type0: NULL if not available */
+ struct hpp_type1 *t1; /* Type1: NULL if not available */
+ struct hpp_type2 *t2; /* Type2: NULL if not available */
+ struct hpp_type0 type0_data;
+ struct hpp_type1 type1_data;
+ struct hpp_type2 type2_data;
+};
+
+#ifdef CONFIG_ACPI
+#include <linux/acpi.h>
+int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp);
+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 pci_get_hp_params(struct pci_dev *dev,
+ struct hotplug_params *hpp)
+{
+ return -ENODEV;
+}
+
+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