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437eb7bf7b
We're about to add runtime PM of hotplug ports, but we need to restrict it to ports that are handled natively by the OS: If they're handled by the firmware (which is the case for Thunderbolt on non-Macs), things would break if the OS put the ports into D3hot behind the firmware's back. To determine if a hotplug port is handled natively, one has to walk up from the port to the root bridge and check the cached _OSC Control Field for the value of the "PCI Express Native Hot Plug control" bit. There's already a function to do that, device_is_managed_by_native_pciehp(), but it's private to drivers/pci/hotplug/acpiphp_glue.c and only compiled in if CONFIG_HOTPLUG_PCI_ACPI is enabled. Make it public and move it to drivers/pci/pci-acpi.c, so that it is available in the more general CONFIG_ACPI case. The function contains a check if the device in question is a hotplug port and returns false if it's not. The caller we're going to add doesn't need this as it only calls the function if it actually *is* a hotplug port. Move the check out of the function into the single existing caller. Rename it to pciehp_is_native() and add some kerneldoc and polish. No functional change intended. Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
192 lines
6.9 KiB
C
192 lines
6.9 KiB
C
/*
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* PCI HotPlug Core Functions
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*
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* Copyright (C) 1995,2001 Compaq Computer Corporation
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* Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
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* Copyright (C) 2001 IBM Corp.
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <kristen.c.accardi@intel.com>
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*
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*/
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#ifndef _PCI_HOTPLUG_H
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#define _PCI_HOTPLUG_H
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/**
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* struct hotplug_slot_ops -the callbacks that the hotplug pci core can use
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* @owner: The module owner of this structure
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* @mod_name: The module name (KBUILD_MODNAME) of this structure
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* @enable_slot: Called when the user wants to enable a specific pci slot
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* @disable_slot: Called when the user wants to disable a specific pci slot
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* @set_attention_status: Called to set the specific slot's attention LED to
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* the specified value
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* @hardware_test: Called to run a specified hardware test on the specified
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* slot.
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* @get_power_status: Called to get the current power status of a slot.
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* If this field is NULL, the value passed in the struct hotplug_slot_info
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* will be used when this value is requested by a user.
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* @get_attention_status: Called to get the current attention status of a slot.
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* If this field is NULL, the value passed in the struct hotplug_slot_info
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* will be used when this value is requested by a user.
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* @get_latch_status: Called to get the current latch status of a slot.
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* If this field is NULL, the value passed in the struct hotplug_slot_info
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* will be used when this value is requested by a user.
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* @get_adapter_status: Called to get see if an adapter is present in the slot or not.
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* If this field is NULL, the value passed in the struct hotplug_slot_info
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* will be used when this value is requested by a user.
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* @reset_slot: Optional interface to allow override of a bus reset for the
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* slot for cases where a secondary bus reset can result in spurious
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* hotplug events or where a slot can be reset independent of the bus.
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*
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* The table of function pointers that is passed to the hotplug pci core by a
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* hotplug pci driver. These functions are called by the hotplug pci core when
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* the user wants to do something to a specific slot (query it for information,
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* set an LED, enable / disable power, etc.)
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*/
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struct hotplug_slot_ops {
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struct module *owner;
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const char *mod_name;
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int (*enable_slot) (struct hotplug_slot *slot);
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int (*disable_slot) (struct hotplug_slot *slot);
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int (*set_attention_status) (struct hotplug_slot *slot, u8 value);
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int (*hardware_test) (struct hotplug_slot *slot, u32 value);
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int (*get_power_status) (struct hotplug_slot *slot, u8 *value);
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int (*get_attention_status) (struct hotplug_slot *slot, u8 *value);
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int (*get_latch_status) (struct hotplug_slot *slot, u8 *value);
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int (*get_adapter_status) (struct hotplug_slot *slot, u8 *value);
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int (*reset_slot) (struct hotplug_slot *slot, int probe);
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};
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/**
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* struct hotplug_slot_info - used to notify the hotplug pci core of the state of the slot
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* @power_status: if power is enabled or not (1/0)
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* @attention_status: if the attention light is enabled or not (1/0)
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* @latch_status: if the latch (if any) is open or closed (1/0)
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* @adapter_status: if there is a pci board present in the slot or not (1/0)
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*
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* Used to notify the hotplug pci core of the status of a specific slot.
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*/
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struct hotplug_slot_info {
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u8 power_status;
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u8 attention_status;
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u8 latch_status;
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u8 adapter_status;
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};
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/**
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* struct hotplug_slot - used to register a physical slot with the hotplug pci core
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* @ops: pointer to the &struct hotplug_slot_ops to be used for this slot
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* @info: pointer to the &struct hotplug_slot_info for the initial values for
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* this slot.
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* @release: called during pci_hp_deregister to free memory allocated in a
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* hotplug_slot structure.
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* @private: used by the hotplug pci controller driver to store whatever it
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* needs.
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*/
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struct hotplug_slot {
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struct hotplug_slot_ops *ops;
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struct hotplug_slot_info *info;
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void (*release) (struct hotplug_slot *slot);
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void *private;
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/* Variables below this are for use only by the hotplug pci core. */
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struct list_head slot_list;
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struct pci_slot *pci_slot;
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};
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static inline const char *hotplug_slot_name(const struct hotplug_slot *slot)
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{
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return pci_slot_name(slot->pci_slot);
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}
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int __pci_hp_register(struct hotplug_slot *slot, struct pci_bus *pbus, int nr,
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const char *name, struct module *owner,
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const char *mod_name);
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int pci_hp_deregister(struct hotplug_slot *slot);
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int __must_check pci_hp_change_slot_info(struct hotplug_slot *slot,
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struct hotplug_slot_info *info);
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/* use a define to avoid include chaining to get THIS_MODULE & friends */
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#define pci_hp_register(slot, pbus, devnr, name) \
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__pci_hp_register(slot, pbus, devnr, name, THIS_MODULE, KBUILD_MODNAME)
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/* PCI Setting Record (Type 0) */
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struct hpp_type0 {
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u32 revision;
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u8 cache_line_size;
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u8 latency_timer;
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u8 enable_serr;
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u8 enable_perr;
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};
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/* PCI-X Setting Record (Type 1) */
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struct hpp_type1 {
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u32 revision;
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u8 max_mem_read;
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u8 avg_max_split;
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u16 tot_max_split;
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};
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/* PCI Express Setting Record (Type 2) */
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struct hpp_type2 {
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u32 revision;
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u32 unc_err_mask_and;
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u32 unc_err_mask_or;
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u32 unc_err_sever_and;
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u32 unc_err_sever_or;
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u32 cor_err_mask_and;
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u32 cor_err_mask_or;
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u32 adv_err_cap_and;
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u32 adv_err_cap_or;
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u16 pci_exp_devctl_and;
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u16 pci_exp_devctl_or;
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u16 pci_exp_lnkctl_and;
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u16 pci_exp_lnkctl_or;
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u32 sec_unc_err_sever_and;
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u32 sec_unc_err_sever_or;
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u32 sec_unc_err_mask_and;
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u32 sec_unc_err_mask_or;
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};
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struct hotplug_params {
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struct hpp_type0 *t0; /* Type0: NULL if not available */
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struct hpp_type1 *t1; /* Type1: NULL if not available */
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struct hpp_type2 *t2; /* Type2: NULL if not available */
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struct hpp_type0 type0_data;
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struct hpp_type1 type1_data;
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struct hpp_type2 type2_data;
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};
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#ifdef CONFIG_ACPI
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#include <linux/acpi.h>
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int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp);
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bool pciehp_is_native(struct pci_dev *pdev);
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int acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev, u32 flags);
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int acpi_pci_check_ejectable(struct pci_bus *pbus, acpi_handle handle);
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int acpi_pci_detect_ejectable(acpi_handle handle);
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#else
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static inline int pci_get_hp_params(struct pci_dev *dev,
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struct hotplug_params *hpp)
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{
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return -ENODEV;
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}
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static inline bool pciehp_is_native(struct pci_dev *pdev) { return true; }
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#endif
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#endif
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