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https://github.com/brain-hackers/linux-brain.git
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dad4f140ed
Pull XArray conversion from Matthew Wilcox: "The XArray provides an improved interface to the radix tree data structure, providing locking as part of the API, specifying GFP flags at allocation time, eliminating preloading, less re-walking the tree, more efficient iterations and not exposing RCU-protected pointers to its users. This patch set 1. Introduces the XArray implementation 2. Converts the pagecache to use it 3. Converts memremap to use it The page cache is the most complex and important user of the radix tree, so converting it was most important. Converting the memremap code removes the only other user of the multiorder code, which allows us to remove the radix tree code that supported it. I have 40+ followup patches to convert many other users of the radix tree over to the XArray, but I'd like to get this part in first. The other conversions haven't been in linux-next and aren't suitable for applying yet, but you can see them in the xarray-conv branch if you're interested" * 'xarray' of git://git.infradead.org/users/willy/linux-dax: (90 commits) radix tree: Remove multiorder support radix tree test: Convert multiorder tests to XArray radix tree tests: Convert item_delete_rcu to XArray radix tree tests: Convert item_kill_tree to XArray radix tree tests: Move item_insert_order radix tree test suite: Remove multiorder benchmarking radix tree test suite: Remove __item_insert memremap: Convert to XArray xarray: Add range store functionality xarray: Move multiorder_check to in-kernel tests xarray: Move multiorder_shrink to kernel tests xarray: Move multiorder account test in-kernel radix tree test suite: Convert iteration test to XArray radix tree test suite: Convert tag_tagged_items to XArray radix tree: Remove radix_tree_clear_tags radix tree: Remove radix_tree_maybe_preload_order radix tree: Remove split/join code radix tree: Remove radix_tree_update_node_t page cache: Finish XArray conversion dax: Convert page fault handlers to XArray ...
313 lines
8.3 KiB
C
313 lines
8.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* ACPI PCI Hot Plug Controller Driver
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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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* Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
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* Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
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* Copyright (C) 2002,2003 NEC Corporation
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* Copyright (C) 2003-2005 Matthew Wilcox (willy@infradead.org)
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* Copyright (C) 2003-2005 Hewlett Packard
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*
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* All rights reserved.
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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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#define pr_fmt(fmt) "acpiphp: " fmt
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/pci-acpi.h>
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#include <linux/pci_hotplug.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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#include "acpiphp.h"
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/* name size which is used for entries in pcihpfs */
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#define SLOT_NAME_SIZE 21 /* {_SUN} */
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bool acpiphp_disabled;
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/* local variables */
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static struct acpiphp_attention_info *attention_info;
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#define DRIVER_VERSION "0.5"
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#define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@us.ibm.com>, Takayoshi Kochi <t-kochi@bq.jp.nec.com>, Matthew Wilcox <willy@infradead.org>"
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#define DRIVER_DESC "ACPI Hot Plug PCI Controller Driver"
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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MODULE_PARM_DESC(disable, "disable acpiphp driver");
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module_param_named(disable, acpiphp_disabled, bool, 0444);
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static int enable_slot(struct hotplug_slot *slot);
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static int disable_slot(struct hotplug_slot *slot);
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static int set_attention_status(struct hotplug_slot *slot, u8 value);
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static int get_power_status(struct hotplug_slot *slot, u8 *value);
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static int get_attention_status(struct hotplug_slot *slot, u8 *value);
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static int get_latch_status(struct hotplug_slot *slot, u8 *value);
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static int get_adapter_status(struct hotplug_slot *slot, u8 *value);
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static const struct hotplug_slot_ops acpi_hotplug_slot_ops = {
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.enable_slot = enable_slot,
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.disable_slot = disable_slot,
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.set_attention_status = set_attention_status,
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.get_power_status = get_power_status,
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.get_attention_status = get_attention_status,
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.get_latch_status = get_latch_status,
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.get_adapter_status = get_adapter_status,
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};
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/**
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* acpiphp_register_attention - set attention LED callback
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* @info: must be completely filled with LED callbacks
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*
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* Description: This is used to register a hardware specific ACPI
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* driver that manipulates the attention LED. All the fields in
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* info must be set.
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*/
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int acpiphp_register_attention(struct acpiphp_attention_info *info)
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{
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int retval = -EINVAL;
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if (info && info->owner && info->set_attn &&
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info->get_attn && !attention_info) {
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retval = 0;
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attention_info = info;
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}
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return retval;
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}
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EXPORT_SYMBOL_GPL(acpiphp_register_attention);
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/**
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* acpiphp_unregister_attention - unset attention LED callback
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* @info: must match the pointer used to register
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*
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* Description: This is used to un-register a hardware specific acpi
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* driver that manipulates the attention LED. The pointer to the
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* info struct must be the same as the one used to set it.
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*/
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int acpiphp_unregister_attention(struct acpiphp_attention_info *info)
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{
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int retval = -EINVAL;
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if (info && attention_info == info) {
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attention_info = NULL;
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retval = 0;
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}
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return retval;
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}
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EXPORT_SYMBOL_GPL(acpiphp_unregister_attention);
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/**
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* enable_slot - power on and enable a slot
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* @hotplug_slot: slot to enable
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*
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* Actual tasks are done in acpiphp_enable_slot()
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*/
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static int enable_slot(struct hotplug_slot *hotplug_slot)
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{
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struct slot *slot = to_slot(hotplug_slot);
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pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot));
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/* enable the specified slot */
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return acpiphp_enable_slot(slot->acpi_slot);
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}
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/**
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* disable_slot - disable and power off a slot
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* @hotplug_slot: slot to disable
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*
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* Actual tasks are done in acpiphp_disable_slot()
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*/
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static int disable_slot(struct hotplug_slot *hotplug_slot)
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{
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struct slot *slot = to_slot(hotplug_slot);
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pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot));
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/* disable the specified slot */
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return acpiphp_disable_slot(slot->acpi_slot);
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}
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/**
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* set_attention_status - set attention LED
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* @hotplug_slot: slot to set attention LED on
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* @status: value to set attention LED to (0 or 1)
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*
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* attention status LED, so we use a callback that
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* was registered with us. This allows hardware specific
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* ACPI implementations to blink the light for us.
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*/
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static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
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{
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int retval = -ENODEV;
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pr_debug("%s - physical_slot = %s\n", __func__,
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hotplug_slot_name(hotplug_slot));
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if (attention_info && try_module_get(attention_info->owner)) {
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retval = attention_info->set_attn(hotplug_slot, status);
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module_put(attention_info->owner);
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} else
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attention_info = NULL;
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return retval;
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}
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/**
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* get_power_status - get power status of a slot
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* @hotplug_slot: slot to get status
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* @value: pointer to store status
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*
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* Some platforms may not implement _STA method properly.
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* In that case, the value returned may not be reliable.
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*/
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static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
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{
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struct slot *slot = to_slot(hotplug_slot);
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pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot));
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*value = acpiphp_get_power_status(slot->acpi_slot);
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return 0;
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}
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/**
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* get_attention_status - get attention LED status
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* @hotplug_slot: slot to get status from
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* @value: returns with value of attention LED
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*
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* ACPI doesn't have known method to determine the state
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* of the attention status LED, so we use a callback that
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* was registered with us. This allows hardware specific
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* ACPI implementations to determine its state.
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*/
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static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
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{
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int retval = -EINVAL;
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pr_debug("%s - physical_slot = %s\n", __func__,
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hotplug_slot_name(hotplug_slot));
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if (attention_info && try_module_get(attention_info->owner)) {
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retval = attention_info->get_attn(hotplug_slot, value);
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module_put(attention_info->owner);
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} else
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attention_info = NULL;
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return retval;
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}
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/**
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* get_latch_status - get latch status of a slot
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* @hotplug_slot: slot to get status
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* @value: pointer to store status
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*
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* ACPI doesn't provide any formal means to access latch status.
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* Instead, we fake latch status from _STA.
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*/
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static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
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{
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struct slot *slot = to_slot(hotplug_slot);
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pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot));
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*value = acpiphp_get_latch_status(slot->acpi_slot);
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return 0;
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}
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/**
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* get_adapter_status - get adapter status of a slot
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* @hotplug_slot: slot to get status
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* @value: pointer to store status
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*
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* ACPI doesn't provide any formal means to access adapter status.
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* Instead, we fake adapter status from _STA.
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*/
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static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
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{
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struct slot *slot = to_slot(hotplug_slot);
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pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot));
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*value = acpiphp_get_adapter_status(slot->acpi_slot);
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return 0;
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}
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/* callback routine to initialize 'struct slot' for each slot */
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int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot,
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unsigned int sun)
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{
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struct slot *slot;
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int retval = -ENOMEM;
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char name[SLOT_NAME_SIZE];
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slot = kzalloc(sizeof(*slot), GFP_KERNEL);
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if (!slot)
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goto error;
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slot->hotplug_slot.ops = &acpi_hotplug_slot_ops;
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slot->acpi_slot = acpiphp_slot;
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acpiphp_slot->slot = slot;
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slot->sun = sun;
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snprintf(name, SLOT_NAME_SIZE, "%u", sun);
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retval = pci_hp_register(&slot->hotplug_slot, acpiphp_slot->bus,
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acpiphp_slot->device, name);
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if (retval == -EBUSY)
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goto error_slot;
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if (retval) {
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pr_err("pci_hp_register failed with error %d\n", retval);
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goto error_slot;
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}
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pr_info("Slot [%s] registered\n", slot_name(slot));
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return 0;
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error_slot:
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kfree(slot);
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error:
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return retval;
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}
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void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot)
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{
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struct slot *slot = acpiphp_slot->slot;
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pr_info("Slot [%s] unregistered\n", slot_name(slot));
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pci_hp_deregister(&slot->hotplug_slot);
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kfree(slot);
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}
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void __init acpiphp_init(void)
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{
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pr_info(DRIVER_DESC " version: " DRIVER_VERSION "%s\n",
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acpiphp_disabled ? ", disabled by user; please report a bug"
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: "");
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}
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