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TOMOYO Linux Cross Reference
Linux/include/linux/pci_hotplug.h

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  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 *pdev);
166 int acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev, u32 flags);
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 *pdev) { return true; }
176 #endif
177 #endif
178 

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