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  * @owner: The module owner of this structure
  20  * @mod_name: The module name (KBUILD_MODNAME) of this structure
  21  * @enable_slot: Called when the user wants to enable a specific pci slot
  22  * @disable_slot: Called when the user wants to disable a specific pci slot
  23  * @set_attention_status: Called to set the specific slot's attention LED to
  24  * the specified value
  25  * @hardware_test: Called to run a specified hardware test on the specified
  26  * slot.
  27  * @get_power_status: Called to get the current power status of a slot.
  28  *      If this field is NULL, the value passed in the struct hotplug_slot_info
  29  *      will be used when this value is requested by a user.
  30  * @get_attention_status: Called to get the current attention status of a slot.
  31  *      If this field is NULL, the value passed in the struct hotplug_slot_info
  32  *      will be used when this value is requested by a user.
  33  * @get_latch_status: Called to get the current latch status of a slot.
  34  *      If this field is NULL, the value passed in the struct hotplug_slot_info
  35  *      will be used when this value is requested by a user.
  36  * @get_adapter_status: Called to get see if an adapter is present in the slot or not.
  37  *      If this field is NULL, the value passed in the struct hotplug_slot_info
  38  *      will be used when this value is requested by a user.
  39  * @reset_slot: Optional interface to allow override of a bus reset for the
  40  *      slot for cases where a secondary bus reset can result in spurious
  41  *      hotplug events or where a slot can be reset independent of the bus.
  42  *
  43  * The table of function pointers that is passed to the hotplug pci core by a
  44  * hotplug pci driver.  These functions are called by the hotplug pci core when
  45  * the user wants to do something to a specific slot (query it for information,
  46  * set an LED, enable / disable power, etc.)
  47  */
  48 struct hotplug_slot_ops {
  49         struct module *owner;
  50         const char *mod_name;
  51         int (*enable_slot)              (struct hotplug_slot *slot);
  52         int (*disable_slot)             (struct hotplug_slot *slot);
  53         int (*set_attention_status)     (struct hotplug_slot *slot, u8 value);
  54         int (*hardware_test)            (struct hotplug_slot *slot, u32 value);
  55         int (*get_power_status)         (struct hotplug_slot *slot, u8 *value);
  56         int (*get_attention_status)     (struct hotplug_slot *slot, u8 *value);
  57         int (*get_latch_status)         (struct hotplug_slot *slot, u8 *value);
  58         int (*get_adapter_status)       (struct hotplug_slot *slot, u8 *value);
  59         int (*reset_slot)               (struct hotplug_slot *slot, int probe);
  60 };
  61
  62 /**
  63  * struct hotplug_slot_info - used to notify the hotplug pci core of the state of the slot
  64  * @power_status: if power is enabled or not (1/0)
  65  * @attention_status: if the attention light is enabled or not (1/0)
  66  * @latch_status: if the latch (if any) is open or closed (1/0)
  67  * @adapter_status: if there is a pci board present in the slot or not (1/0)
  68  *
  69  * Used to notify the hotplug pci core of the status of a specific slot.
  70  */
  71 struct hotplug_slot_info {
  72         u8      power_status;
  73         u8      attention_status;
  74         u8      latch_status;
  75         u8      adapter_status;
  76 };
  77
  78 /**
  79  * struct hotplug_slot - used to register a physical slot with the hotplug pci core
  80  * @ops: pointer to the &struct hotplug_slot_ops to be used for this slot
  81  * @info: pointer to the &struct hotplug_slot_info for the initial values for
  82  * this slot.
  83  * @release: called during pci_hp_deregister to free memory allocated in a
  84  * hotplug_slot structure.
  85  * @private: used by the hotplug pci controller driver to store whatever it
  86  * needs.
  87  */
  88 struct hotplug_slot {
  89         struct hotplug_slot_ops         *ops;
  90         struct hotplug_slot_info        *info;
  91         void (*release) (struct hotplug_slot *slot);
  92         void                            *private;
  93
  94         /* Variables below this are for use only by the hotplug pci core. */
  95         struct list_head                slot_list;
  96         struct pci_slot                 *pci_slot;
  97 };
  98
  99 static inline const char *hotplug_slot_name(const struct hotplug_slot *slot)
 100 {
 101         return pci_slot_name(slot->pci_slot);
 102 }
 103
 104 int __pci_hp_register(struct hotplug_slot *slot, struct pci_bus *pbus, int nr,
 105                       const char *name, struct module *owner,
 106                       const char *mod_name);
 107 int pci_hp_deregister(struct hotplug_slot *slot);
 108 int __must_check pci_hp_change_slot_info(struct hotplug_slot *slot,
 109                                          struct hotplug_slot_info *info);
 110
 111 /* use a define to avoid include chaining to get THIS_MODULE & friends */
 112 #define pci_hp_register(slot, pbus, devnr, name) \
 113         __pci_hp_register(slot, pbus, devnr, name, THIS_MODULE, KBUILD_MODNAME)
 114
 115 /* PCI Setting Record (Type 0) */
 116 struct hpp_type0 {
 117         u32 revision;
 118         u8  cache_line_size;
 119         u8  latency_timer;
 120         u8  enable_serr;
 121         u8  enable_perr;
 122 };
 123
 124 /* PCI-X Setting Record (Type 1) */
 125 struct hpp_type1 {
 126         u32 revision;
 127         u8  max_mem_read;
 128         u8  avg_max_split;
 129         u16 tot_max_split;
 130 };
 131
 132 /* PCI Express Setting Record (Type 2) */
 133 struct hpp_type2 {
 134         u32 revision;
 135         u32 unc_err_mask_and;
 136         u32 unc_err_mask_or;
 137         u32 unc_err_sever_and;
 138         u32 unc_err_sever_or;
 139         u32 cor_err_mask_and;
 140         u32 cor_err_mask_or;
 141         u32 adv_err_cap_and;
 142         u32 adv_err_cap_or;
 143         u16 pci_exp_devctl_and;
 144         u16 pci_exp_devctl_or;
 145         u16 pci_exp_lnkctl_and;
 146         u16 pci_exp_lnkctl_or;
 147         u32 sec_unc_err_sever_and;
 148         u32 sec_unc_err_sever_or;
 149         u32 sec_unc_err_mask_and;
 150         u32 sec_unc_err_mask_or;
 151 };
 152
 153 struct hotplug_params {
 154         struct hpp_type0 *t0;           /* Type0: NULL if not available */
 155         struct hpp_type1 *t1;           /* Type1: NULL if not available */
 156         struct hpp_type2 *t2;           /* Type2: NULL if not available */
 157         struct hpp_type0 type0_data;
 158         struct hpp_type1 type1_data;
 159         struct hpp_type2 type2_data;
 160 };
 161
 162 #ifdef CONFIG_ACPI
 163 #include <linux/acpi.h>
 164 int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp);
 165 bool pciehp_is_native(struct pci_dev *bridge);
 166 int acpi_get_hp_hw_control_from_firmware(struct pci_dev *bridge);
 167 int acpi_pci_check_ejectable(struct pci_bus *pbus, acpi_handle handle);
 168 int acpi_pci_detect_ejectable(acpi_handle handle);
 169 #else
 170 static inline int pci_get_hp_params(struct pci_dev *dev,
 171                                     struct hotplug_params *hpp)
 172 {
 173         return -ENODEV;
 174 }
 175 static inline bool pciehp_is_native(struct pci_dev *bridge) { return true; }
 176 #endif
 177 #endif