Release 4.11 drivers/pci/hotplug/acpiphp_glue.c

/*
 * ACPI PCI HotPlug glue functions to ACPI CA subsystem
 *
 * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
 * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
 * Copyright (C) 2002,2003 NEC Corporation
 * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
 * Copyright (C) 2003-2005 Hewlett Packard
 * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com)
 * Copyright (C) 2005 Intel Corporation
 *
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Send feedback to <kristen.c.accardi@intel.com>
 *
 */

/*
 * Lifetime rules for pci_dev:
 *  - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
 *    when the bridge is scanned and it loses a refcount when the bridge
 *    is removed.
 *  - When a P2P bridge is present, we elevate the refcount on the subordinate
 *    bus. It loses the refcount when the the driver unloads.
 */


#define pr_fmt(fmt) "acpiphp_glue: " fmt

#include <linux/module.h>

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/pci-acpi.h>
#include <linux/pm_runtime.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/acpi.h>

#include "../pci.h"
#include "acpiphp.h"

static LIST_HEAD(bridge_list);
static DEFINE_MUTEX(bridge_mutex);

static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type);
static void acpiphp_post_dock_fixup(struct acpi_device *adev);
static void acpiphp_sanitize_bus(struct pci_bus *bus);
static void hotplug_event(u32 type, struct acpiphp_context *context);
static void free_bridge(struct kref *kref);

/**
 * acpiphp_init_context - Create hotplug context and grab a reference to it.
 * @adev: ACPI device object to create the context for.
 *
 * Call under acpi_hp_context_lock.
 */


static struct acpiphp_context *acpiphp_init_context(struct acpi_device *adev)
{
	struct acpiphp_context *context;

	context = kzalloc(sizeof(*context), GFP_KERNEL);
	if (!context)
		return NULL;

	context->refcount = 1;
	context->hp.notify = acpiphp_hotplug_notify;
	context->hp.fixup = acpiphp_post_dock_fixup;
	acpi_set_hp_context(adev, &context->hp);
	return context;
}

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/**
 * acpiphp_get_context - Get hotplug context and grab a reference to it.
 * @adev: ACPI device object to get the context for.
 *
 * Call under acpi_hp_context_lock.
 */


static struct acpiphp_context *acpiphp_get_context(struct acpi_device *adev)
{
	struct acpiphp_context *context;

	if (!adev->hp)
		return NULL;

	context = to_acpiphp_context(adev->hp);
	context->refcount++;
	return context;
}

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/**
 * acpiphp_put_context - Drop a reference to ACPI hotplug context.
 * @context: ACPI hotplug context to drop a reference to.
 *
 * The context object is removed if there are no more references to it.
 *
 * Call under acpi_hp_context_lock.
 */


static void acpiphp_put_context(struct acpiphp_context *context)
{
	if (--context->refcount)
		return;

	WARN_ON(context->bridge);
	context->hp.self->hp = NULL;
	kfree(context);
}

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static inline void get_bridge(struct acpiphp_bridge *bridge)
{
	kref_get(&bridge->ref);
}

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static inline void put_bridge(struct acpiphp_bridge *bridge)
{
	kref_put(&bridge->ref, free_bridge);
}

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static struct acpiphp_context *acpiphp_grab_context(struct acpi_device *adev)
{
	struct acpiphp_context *context;

	acpi_lock_hp_context();
	context = acpiphp_get_context(adev);
	if (!context || context->func.parent->is_going_away) {
		acpi_unlock_hp_context();
		return NULL;
	}
	get_bridge(context->func.parent);
	acpiphp_put_context(context);
	acpi_unlock_hp_context();
	return context;
}

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static void acpiphp_let_context_go(struct acpiphp_context *context)
{
	put_bridge(context->func.parent);
}

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static void free_bridge(struct kref *kref)
{
	struct acpiphp_context *context;
	struct acpiphp_bridge *bridge;
	struct acpiphp_slot *slot, *next;
	struct acpiphp_func *func, *tmp;

	acpi_lock_hp_context();

	bridge = container_of(kref, struct acpiphp_bridge, ref);

	list_for_each_entry_safe(slot, next, &bridge->slots, node) {
		list_for_each_entry_safe(func, tmp, &slot->funcs, sibling)
			acpiphp_put_context(func_to_context(func));

		kfree(slot);
	}

	context = bridge->context;
	/* Root bridges will not have hotplug context. */
	if (context) {
		/* Release the reference taken by acpiphp_enumerate_slots(). */
		put_bridge(context->func.parent);
		context->bridge = NULL;
		acpiphp_put_context(context);
	}

	put_device(&bridge->pci_bus->dev);
	pci_dev_put(bridge->pci_dev);
	kfree(bridge);

	acpi_unlock_hp_context();
}

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/**
 * acpiphp_post_dock_fixup - Post-dock fixups for PCI devices.
 * @adev: ACPI device object corresponding to a PCI device.
 *
 * TBD - figure out a way to only call fixups for systems that require them.
 */


static void acpiphp_post_dock_fixup(struct acpi_device *adev)
{
	struct acpiphp_context *context = acpiphp_grab_context(adev);
	struct pci_bus *bus;
	u32 buses;

	if (!context)
		return;

	bus = context->func.slot->bus;
	if (!bus->self)
		goto out;

	/* fixup bad _DCK function that rewrites
         * secondary bridge on slot
         */
	pci_read_config_dword(bus->self, PCI_PRIMARY_BUS, &buses);

	if (((buses >> 8) & 0xff) != bus->busn_res.start) {
		buses = (buses & 0xff000000)
			| ((unsigned int)(bus->primary)     <<  0)
			| ((unsigned int)(bus->busn_res.start)   <<  8)
			| ((unsigned int)(bus->busn_res.end) << 16);
		pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
	}

 out:
	acpiphp_let_context_go(context);
}

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/**
 * acpiphp_add_context - Add ACPIPHP context to an ACPI device object.
 * @handle: ACPI handle of the object to add a context to.
 * @lvl: Not used.
 * @data: The object's parent ACPIPHP bridge.
 * @rv: Not used.
 */


static acpi_status acpiphp_add_context(acpi_handle handle, u32 lvl, void *data,
				       void **rv)
{
	struct acpiphp_bridge *bridge = data;
	struct acpiphp_context *context;
	struct acpi_device *adev;
	struct acpiphp_slot *slot;
	struct acpiphp_func *newfunc;
	acpi_status status = AE_OK;
	unsigned long long adr;
	int device, function;
	struct pci_bus *pbus = bridge->pci_bus;
	struct pci_dev *pdev = bridge->pci_dev;
	u32 val;

	status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
	if (ACPI_FAILURE(status)) {
		if (status != AE_NOT_FOUND)
			acpi_handle_warn(handle,
				"can't evaluate _ADR (%#x)\n", status);
		return AE_OK;
	}
	if (acpi_bus_get_device(handle, &adev))
		return AE_OK;

	device = (adr >> 16) & 0xffff;
	function = adr & 0xffff;

	acpi_lock_hp_context();
	context = acpiphp_init_context(adev);
	if (!context) {
		acpi_unlock_hp_context();
		acpi_handle_err(handle, "No hotplug context\n");
		return AE_NOT_EXIST;
	}
	newfunc = &context->func;
	newfunc->function = function;
	newfunc->parent = bridge;
	acpi_unlock_hp_context();

	/*
         * If this is a dock device, its _EJ0 should be executed by the dock
         * notify handler after calling _DCK.
         */
	if (!is_dock_device(adev) && acpi_has_method(handle, "_EJ0"))
		newfunc->flags = FUNC_HAS_EJ0;

	if (acpi_has_method(handle, "_STA"))
		newfunc->flags |= FUNC_HAS_STA;

	/* search for objects that share the same slot */
	list_for_each_entry(slot, &bridge->slots, node)
		if (slot->device == device)
			goto slot_found;

	slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
	if (!slot) {
		acpi_lock_hp_context();
		acpiphp_put_context(context);
		acpi_unlock_hp_context();
		return AE_NO_MEMORY;
	}

	slot->bus = bridge->pci_bus;
	slot->device = device;
	INIT_LIST_HEAD(&slot->funcs);

	list_add_tail(&slot->node, &bridge->slots);

	/*
         * Expose slots to user space for functions that have _EJ0 or _RMV or
         * are located in dock stations.  Do not expose them for devices handled
         * by the native PCIe hotplug (PCIeHP), becuase that code is supposed to
         * expose slots to user space in those cases.
         */
	if ((acpi_pci_check_ejectable(pbus, handle) || is_dock_device(adev))
	    && !(pdev && pdev->is_hotplug_bridge && pciehp_is_native(pdev))) {
		unsigned long long sun;
		int retval;

		bridge->nr_slots++;
		status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
		if (ACPI_FAILURE(status))
			sun = bridge->nr_slots;

		pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
		    sun, pci_domain_nr(pbus), pbus->number, device);

		retval = acpiphp_register_hotplug_slot(slot, sun);
		if (retval) {
			slot->slot = NULL;
			bridge->nr_slots--;
			if (retval == -EBUSY)
				pr_warn("Slot %llu already registered by another hotplug driver\n", sun);
			else
				pr_warn("acpiphp_register_hotplug_slot failed (err code = 0x%x)\n", retval);
		}
		/* Even if the slot registration fails, we can still use it. */
	}

 slot_found:
	newfunc->slot = slot;
	list_add_tail(&newfunc->sibling, &slot->funcs);

	if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function),
				       &val, 60*1000))
		slot->flags |= SLOT_ENABLED;

	return AE_OK;
}

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17
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Yijing Wang
15
2.87%
1
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Jiang Liu
15
2.87%
2
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Kenji Kaneshige
12
2.29%
1
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Rajesh Shah
8
1.53%
1
2.94%
Toshi Kani
6
1.15%
1
2.94%
Lukas Wunner
5
0.96%
1
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Kristen Carlson Accardi
5
0.96%
1
2.94%
Matthew Garrett
4
0.76%
1
2.94%
Lan Tianyu
3
0.57%
1
2.94%
Ryan Desfosses
2
0.38%
1
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1
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1
0.19%
1
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static void cleanup_bridge(struct acpiphp_bridge *bridge)
{
	struct acpiphp_slot *slot;
	struct acpiphp_func *func;

	list_for_each_entry(slot, &bridge->slots, node) {
		list_for_each_entry(func, &slot->funcs, sibling) {
			struct acpi_device *adev = func_to_acpi_device(func);

			acpi_lock_hp_context();
			adev->hp->notify = NULL;
			adev->hp->fixup = NULL;
			acpi_unlock_hp_context();
		}
		slot->flags |= SLOT_IS_GOING_AWAY;
		if (slot->slot)
			acpiphp_unregister_hotplug_slot(slot);
	}

	mutex_lock(&bridge_mutex);
	list_del(&bridge->list);
	mutex_unlock(&bridge_mutex);

	acpi_lock_hp_context();
	bridge->is_going_away = true;
	acpi_unlock_hp_context();
}

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Jiang Liu
7
5.74%
1
5.56%
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7
5.74%
1
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Takayoshi Kouchi
6
4.92%
1
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MUNEDA Takahiro
5
4.10%
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/**
 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
 * @bus: bus to start search with
 */


static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
{
	struct pci_bus *tmp;
	unsigned char max, n;

	/*
         * pci_bus_max_busnr will return the highest
         * reserved busnr for all these children.
         * that is equivalent to the bus->subordinate
         * value.  We don't want to use the parent's
         * bus->subordinate value because it could have
         * padding in it.
         */
	max = bus->busn_res.start;

	list_for_each_entry(tmp, &bus->children, node) {
		n = pci_bus_max_busnr(tmp);
		if (n > max)
			max = n;
	}
	return max;
}

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static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
{
	struct acpiphp_func *func;
	union acpi_object params[2];
	struct acpi_object_list arg_list;

	list_for_each_entry(func, &slot->funcs, sibling) {
		arg_list.count = 2;
		arg_list.pointer = params;
		params[0].type = ACPI_TYPE_INTEGER;
		params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
		params[1].type = ACPI_TYPE_INTEGER;
		params[1].integer.value = 1;
		/* _REG is optional, we don't care about if there is failure */
		acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list,
				     NULL);
	}
}

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static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev)
{
	struct acpiphp_func *func;

	/* quirk, or pcie could set it already */
	if (dev->is_hotplug_bridge)
		return;

	list_for_each_entry(func, &slot->funcs, sibling) {
		if (PCI_FUNC(dev->devfn) == func->function) {
			dev->is_hotplug_bridge = 1;
			break;
		}
	}
}

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static int acpiphp_rescan_slot(struct acpiphp_slot *slot)
{
	struct acpiphp_func *func;

	list_for_each_entry(func, &slot->funcs, sibling) {
		struct acpi_device *adev = func_to_acpi_device(func);

		acpi_bus_scan(adev->handle);
		if (acpi_device_enumerated(adev))
			acpi_device_set_power(adev, ACPI_STATE_D0);
	}
	return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0));
}

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/**
 * enable_slot - enable, configure a slot
 * @slot: slot to be enabled
 *
 * This function should be called per *physical slot*,
 * not per each slot object in ACPI namespace.
 */


static void enable_slot(struct acpiphp_slot *slot)
{
	struct pci_dev *dev;
	struct pci_bus *bus = slot->bus;
	struct acpiphp_func *func;
	int max, pass;
	LIST_HEAD(add_list);

	acpiphp_rescan_slot(slot);
	max = acpiphp_max_busnr(bus);
	for (pass = 0; pass < 2; pass++) {
		list_for_each_entry(dev, &bus->devices, bus_list) {
			if (PCI_SLOT(dev->devfn) != slot->device)
				continue;

			if (pci_is_bridge(dev)) {
				max = pci_scan_bridge(bus, dev, max, pass);
				if (pass && dev->subordinate) {
					check_hotplug_bridge(slot, dev);
					pcibios_resource_survey_bus(dev->subordinate);
					__pci_bus_size_bridges(dev->subordinate,
							       &add_list);
				}
			}
		}
	}
	__pci_bus_assign_resources(bus, &add_list, NULL);

	acpiphp_sanitize_bus(bus);
	pcie_bus_configure_settings(bus);
	acpiphp_set_acpi_region(slot);

	list_for_each_entry(dev, &bus->devices, bus_list) {
		/* Assume that newly added devices are powered on already. */
		if (!dev->is_added)
			dev->current_state = PCI_D0;
	}

	pci_bus_add_devices(bus);

	slot->flags |= SLOT_ENABLED;
	list_for_each_entry(func, &slot->funcs, sibling) {
		dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
						  func->function));
		if (!dev) {
			/* Do not set SLOT_ENABLED flag if some funcs
                           are not added. */
			slot->flags &= (~SLOT_ENABLED);
			continue;
		}
	}
}

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29
11.46%
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11
4.35%
1
4.55%
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9
3.56%
1
4.55%
MUNEDA Takahiro
8
3.16%
2
9.09%
Alexander Chiang
7
2.77%
2
9.09%
Greg Kroah-Hartman
7
2.77%
1
4.55%
David Shaohua Li
5
1.98%
1
4.55%
Rafael J. Wysocki
4
1.58%
3
13.64%
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3
1.19%
1
4.55%
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2
0.79%
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4.55%
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/**
 * disable_slot - disable a slot
 * @slot: ACPI PHP slot
 */


static void disable_slot(struct acpiphp_slot *slot)
{
	struct pci_bus *bus = slot->bus;
	struct pci_dev *dev, *prev;
	struct acpiphp_func *func;

	/*
         * enable_slot() enumerates all functions in this device via
         * pci_scan_slot(), whether they have associated ACPI hotplug
         * methods (_EJ0, etc.) or not.  Therefore, we remove all functions
         * here.
         */
	list_for_each_entry_safe_reverse(dev, prev, &bus->devices, bus_list)
		if (PCI_SLOT(dev->devfn) == slot->device)
			pci_stop_and_remove_bus_device(dev);

	list_for_each_entry(func, &slot->funcs, sibling)
		acpi_bus_trim(func_to_acpi_device(func));

	slot->flags &= (~SLOT_ENABLED);
}

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1
10.00%
Rafael J. Wysocki
17
19.54%
4
40.00%
Takayoshi Kouchi
10
11.49%
1
10.00%
Alexander Chiang
6
6.90%
1
10.00%
Satoru Takeuchi
5
5.75%
1
10.00%
MUNEDA Takahiro
4
4.60%
1
10.00%
Björn Helgaas
1
1.15%
1
10.00%
Total
87
100.00%
10
100.00%



static bool slot_no_hotplug(struct acpiphp_slot *slot)
{
	struct pci_bus *bus = slot->bus;
	struct pci_dev *dev;

	list_for_each_entry(dev, &bus->devices, bus_list) {
		if (PCI_SLOT(dev->devfn) == slot->device && dev->ignore_hotplug)
			return true;
	}
	return false;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
30
51.72%
1
50.00%
Björn Helgaas
28
48.28%
1
50.00%
Total
58
100.00%
2
100.00%

/**
 * get_slot_status - get ACPI slot status
 * @slot: ACPI PHP slot
 *
 * If a slot has _STA for each function and if any one of them
 * returned non-zero status, return it.
 *
 * If a slot doesn't have _STA and if any one of its functions'
 * configuration space is configured, return 0x0f as a _STA.
 *
 * Otherwise return 0.
 */


static unsigned int get_slot_status(struct acpiphp_slot *slot)
{
	unsigned long long sta = 0;
	struct acpiphp_func *func;

	list_for_each_entry(func, &slot->funcs, sibling) {
		if (func->flags & FUNC_HAS_STA) {
			acpi_status status;

			status = acpi_evaluate_integer(func_to_handle(func),
						       "_STA", NULL, &sta);
			if (ACPI_SUCCESS(status) && sta)
				break;
		} else {
			u32 dvid;

			pci_bus_read_config_dword(slot->bus,
						  PCI_DEVFN(slot->device,
							    func->function),
						  PCI_VENDOR_ID, &dvid);
			if (dvid != 0xffffffff) {
				sta = ACPI_STA_ALL;
				break;
			}
		}
	}

	return (unsigned int)sta;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Takayoshi Kouchi
108
87.80%
1
20.00%
Rafael J. Wysocki
10
8.13%
2
40.00%
Alexander Chiang
4
3.25%
1
20.00%
Matthew Wilcox
1
0.81%
1
20.00%
Total
123
100.00%
5
100.00%



static inline bool device_status_valid(unsigned int sta)
{
	/*
         * ACPI spec says that _STA may return bit 0 clear with bit 3 set
         * if the device is valid but does not require a device driver to be
         * loaded (Section 6.3.7 of ACPI 5.0A).
         */
	unsigned int mask = ACPI_STA_DEVICE_ENABLED | ACPI_STA_DEVICE_FUNCTIONING;
	return (sta & mask) == mask;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mika Westerberg
29
100.00%
1
100.00%
Total
29
100.00%
1
100.00%

/**
 * trim_stale_devices - remove PCI devices that are not responding.
 * @dev: PCI device to start walking the hierarchy from.
 */


static void trim_stale_devices(struct pci_dev *dev)
{
	struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
	struct pci_bus *bus = dev->subordinate;
	bool alive = dev->ignore_hotplug;

	if (adev) {
		acpi_status status;
		unsigned long long sta;

		status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
		alive = alive || (ACPI_SUCCESS(status) && device_status_valid(sta));
	}
	if (!alive)
		alive = pci_device_is_present(dev);

	if (!alive) {
		pci_stop_and_remove_bus_device(dev);
		if (adev)
			acpi_bus_trim(adev);
	} else if (bus) {
		struct pci_dev *child, *tmp;

		/* The device is a bridge. so check the bus below it. */
		pm_runtime_get_sync(&dev->dev);
		list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list)
			trim_stale_devices(child);

		pm_runtime_put(&dev->dev);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
129
77.71%
7
70.00%
Greg Kroah-Hartman
30
18.07%
1
10.00%
Yijing Wang
4
2.41%
1
10.00%
Mika Westerberg
3
1.81%
1
10.00%
Total
166
100.00%
10
100.00%

/**
 * acpiphp_check_bridge - re-enumerate devices
 * @bridge: where to begin re-enumeration
 *
 * Iterate over all slots under this bridge and make sure that if a
 * card is present they are enabled, and if not they are disabled.
 */


static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
{
	struct acpiphp_slot *slot;

	/* Bail out if the bridge is going away. */
	if (bridge->is_going_away)
		return;

	if (bridge->pci_dev)
		pm_runtime_get_sync(&bridge->pci_dev->dev);

	list_for_each_entry(slot, &bridge->slots, node) {
		struct pci_bus *bus = slot->bus;
		struct pci_dev *dev, *tmp;

		if (slot_no_hotplug(slot)) {
			; /* do nothing */
		} else if (device_status_valid(get_slot_status(slot))) {
			/* remove stale devices if any */
			list_for_each_entry_safe_reverse(dev, tmp,
							 &bus->devices, bus_list)
				if (PCI_SLOT(dev->devfn) == slot->device)
					trim_stale_devices(dev);

			/* configure all functions */
			enable_slot(slot);
		} else {
			disable_slot(slot);
		}
	}

	if (bridge->pci_dev)
		pm_runtime_put(&bridge->pci_dev->dev);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
131
87.33%
6
75.00%
Greg Kroah-Hartman
16
10.67%
1
12.50%
Mika Westerberg
3
2.00%
1
12.50%
Total
150
100.00%
8
100.00%

/*
 * Remove devices for which we could not assign resources, call
 * arch specific code to fix-up the bus
 */


static void acpiphp_sanitize_bus(struct pci_bus *bus)
{
	struct pci_dev *dev, *tmp;
	int i;
	unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;

	list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) {
		for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) {
			struct resource *res = &dev->resource[i];
			if ((res->flags & type_mask) && !res->start &&
					res->end) {
				/* Could not assign a required resources
                                 * for this device, remove it */
				pci_stop_and_remove_bus_device(dev);
				break;
			}
		}
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rajesh Shah
91
92.86%
1
25.00%
Yijing Wang
5
5.10%
1
25.00%
Yinghai Lu
1
1.02%
1
25.00%
Rafael J. Wysocki
1
1.02%
1
25.00%
Total
98
100.00%
4
100.00%

/*
 * ACPI event handlers
 */



void acpiphp_check_host_bridge(struct acpi_device *adev)
{
	struct acpiphp_bridge *bridge = NULL;

	acpi_lock_hp_context();
	if (adev->hp) {
		bridge = to_acpiphp_root_context(adev->hp)->root_bridge;
		if (bridge)
			get_bridge(bridge);
	}
	acpi_unlock_hp_context();
	if (bridge) {
		pci_lock_rescan_remove();

		acpiphp_check_bridge(bridge);

		pci_unlock_rescan_remove();
		put_bridge(bridge);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
41
56.16%
3
75.00%
Yinghai Lu
32
43.84%
1
25.00%
Total
73
100.00%
4
100.00%

static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot);



static void hotplug_event(u32 type, struct acpiphp_context *context)
{
	acpi_handle handle = context->hp.self->handle;
	struct acpiphp_func *func = &context->func;
	struct acpiphp_slot *slot = func->slot;
	struct acpiphp_bridge *bridge;

	acpi_lock_hp_context();
	bridge = context->bridge;
	if (bridge)
		get_bridge(bridge);

	acpi_unlock_hp_context();

	pci_lock_rescan_remove();

	switch (type) {
	case ACPI_NOTIFY_BUS_CHECK:
		/* bus re-enumerate */
		acpi_handle_debug(handle, "Bus check in %s()\n", __func__);
		if (bridge)
			acpiphp_check_bridge(bridge);
		else if (!(slot->flags & SLOT_IS_GOING_AWAY))
			enable_slot(slot);

		break;

	case ACPI_NOTIFY_DEVICE_CHECK:
		/* device check */
		acpi_handle_debug(handle, "Device check in %s()\n", __func__);
		if (bridge) {
			acpiphp_check_bridge(bridge);
		} else if (!(slot->flags & SLOT_IS_GOING_AWAY)) {
			/*
                         * Check if anything has changed in the slot and rescan
                         * from the parent if that's the case.
                         */
			if (acpiphp_rescan_slot(slot))
				acpiphp_check_bridge(func->parent);
		}
		break;

	case ACPI_NOTIFY_EJECT_REQUEST:
		/* request device eject */
		acpi_handle_debug(handle, "Eject request in %s()\n", __func__);
		acpiphp_disable_and_eject_slot(slot);
		break;
	}

	pci_unlock_rescan_remove();
	if (bridge)
		put_bridge(bridge);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
133
65.20%
17
65.38%
Rajesh Shah
51
25.00%
2
7.69%
Prarit Bhargava
5
2.45%
1
3.85%
MUNEDA Takahiro
4
1.96%
1
3.85%
Takayoshi Kouchi
4
1.96%
1
3.85%
Gary Hade
4
1.96%
1
3.85%
Mika Westerberg
1
0.49%
1
3.85%
Jiang Liu
1
0.49%
1
3.85%
Harvey Harrison
1
0.49%
1
3.85%
Total
204
100.00%
26
100.00%



static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type)
{
	struct acpiphp_context *context;

	context = acpiphp_grab_context(adev);
	if (!context)
		return -ENODATA;

	hotplug_event(type, context);
	acpiphp_let_context_go(context);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
37
74.00%
10
83.33%
Prarit Bhargava
9
18.00%
1
8.33%
Jiang Liu
4
8.00%
1
8.33%
Total
50
100.00%
12
100.00%

/**
 * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus.
 * @bus: PCI bus to enumerate the slots for.
 *
 * A "slot" is an object associated with a PCI device number.  All functions
 * (PCI devices) with the same bus and device number belong to the same slot.
 */


void acpiphp_enumerate_slots(struct pci_bus *bus)
{
	struct acpiphp_bridge *bridge;
	struct acpi_device *adev;
	acpi_handle handle;
	acpi_status status;

	if (acpiphp_disabled)
		return;

	adev = ACPI_COMPANION(bus->bridge);
	if (!adev)
		return;

	handle = adev->handle;
	bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
	if (!bridge) {
		acpi_handle_err(handle, "No memory for bridge object\n");
		return;
	}

	INIT_LIST_HEAD(&bridge->slots);
	kref_init(&bridge->ref);
	bridge->pci_dev = pci_dev_get(bus->self);
	bridge->pci_bus = bus;

	/*
         * Grab a ref to the subordinate PCI bus in case the bus is
         * removed via PCI core logical hotplug. The ref pins the bus
         * (which we access during module unload).
         */
	get_device(&bus->dev);

	acpi_lock_hp_context();
	if (pci_is_root_bus(bridge->pci_bus)) {
		struct acpiphp_root_context *root_context;

		root_context = kzalloc(sizeof(*root_context), GFP_KERNEL);
		if (!root_context)
			goto err;

		root_context->root_bridge = bridge;
		acpi_set_hp_context(adev, &root_context->hp);
	} else {
		struct acpiphp_context *context;

		/*
                 * This bridge should have been registered as a hotplug function
                 * under its parent, so the context should be there, unless the
                 * parent is going to be handled by pciehp, in which case this
                 * bridge is not interesting to us either.
                 */
		context = acpiphp_get_context(adev);
		if (!context)
			goto err;

		bridge->context = context;
		context->bridge = bridge;
		/* Get a reference to the parent bridge. */
		get_bridge(context->func.parent);
	}
	acpi_unlock_hp_context();

	/* Must be added to the list prior to calling acpiphp_add_context(). */
	mutex_lock(&bridge_mutex);
	list_add(&bridge->list, &bridge_list);
	mutex_unlock(&bridge_mutex);

	/* register all slot objects under this bridge */
	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
				     acpiphp_add_context, NULL, bridge, NULL);
	if (ACPI_FAILURE(status)) {
		acpi_handle_err(handle, "failed to register slots\n");
		cleanup_bridge(bridge);
		put_bridge(bridge);
	}
	return;

 err:
	acpi_unlock_hp_context();
	put_device(&bus->dev);
	pci_dev_put(bridge->pci_dev);
	kfree(bridge);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
239
73.99%
11
64.71%
Jiang Liu
70
21.67%
2
11.76%
Yijing Wang
8
2.48%
1
5.88%
Rajesh Shah
5
1.55%
2
11.76%
Takayoshi Kouchi
1
0.31%
1
5.88%
Total
323
100.00%
17
100.00%



static void acpiphp_drop_bridge(struct acpiphp_bridge *bridge)
{
	if (pci_is_root_bus(bridge->pci_bus)) {
		struct acpiphp_root_context *root_context;
		struct acpi_device *adev;

		acpi_lock_hp_context();
		adev = ACPI_COMPANION(bridge->pci_bus->bridge);
		root_context = to_acpiphp_root_context(adev->hp);
		adev->hp = NULL;
		acpi_unlock_hp_context();
		kfree(root_context);
	}
	cleanup_bridge(bridge);
	put_bridge(bridge);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
78
98.73%
2
66.67%
Wei Yongjun
1
1.27%
1
33.33%
Total
79
100.00%
3
100.00%

/**
 * acpiphp_remove_slots - Remove slot objects associated with a given bus.
 * @bus: PCI bus to remove the slot objects for.
 */


void acpiphp_remove_slots(struct pci_bus *bus)
{
	struct acpiphp_bridge *bridge;

	if (acpiphp_disabled)
		return;

	mutex_lock(&bridge_mutex);
	list_for_each_entry(bridge, &bridge_list, list)
		if (bridge->pci_bus == bus) {
			mutex_unlock(&bridge_mutex);
			acpiphp_drop_bridge(bridge);
			return;
		}

	mutex_unlock(&bridge_mutex);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jiang Liu
33
53.23%
1
16.67%
Rafael J. Wysocki
21
33.87%
2
33.33%
Rajesh Shah
4
6.45%
1
16.67%
Herbert Xu
3
4.84%
1
16.67%
Takayoshi Kouchi
1
1.61%
1
16.67%
Total
62
100.00%
6
100.00%

/**
 * acpiphp_enable_slot - power on slot
 * @slot: ACPI PHP slot
 */


int acpiphp_enable_slot(struct acpiphp_slot *slot)
{
	pci_lock_rescan_remove();

	if (slot->flags & SLOT_IS_GOING_AWAY) {
		pci_unlock_rescan_remove();
		return -ENODEV;
	}

	/* configure all functions */
	if (!(slot->flags & SLOT_ENABLED))
		enable_slot(slot);

	pci_unlock_rescan_remove();
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
20
37.74%
2
40.00%
Takayoshi Kouchi
17
32.08%
1
20.00%
Kirill A. Shutemov
11
20.75%
1
20.00%
Insu Yun
5
9.43%
1
20.00%
Total
53
100.00%
5
100.00%

/**
 * acpiphp_disable_and_eject_slot - power off and eject slot
 * @slot: ACPI PHP slot
 */


static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot)
{
	struct acpiphp_func *func;

	if (slot->flags & SLOT_IS_GOING_AWAY)
		return -ENODEV;

	/* unconfigure all functions */
	disable_slot(slot);

	list_for_each_entry(func, &slot->funcs, sibling)
		if (func->flags & FUNC_HAS_EJ0) {
			acpi_handle handle = func_to_handle(func);

			if (ACPI_FAILURE(acpi_evaluate_ej0(handle)))
				acpi_handle_err(handle, "_EJ0 failed\n");

			break;
		}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mika Westerberg
50
61.73%
1
25.00%
Rafael J. Wysocki
17
20.99%
2
50.00%
Takayoshi Kouchi
14
17.28%
1
25.00%
Total
81
100.00%
4
100.00%



int acpiphp_disable_slot(struct acpiphp_slot *slot)
{
	int ret;

	/*
         * Acquire acpi_scan_lock to ensure that the execution of _EJ0 in
         * acpiphp_disable_and_eject_slot() will be synchronized properly.
         */
	acpi_scan_lock_acquire();
	pci_lock_rescan_remove();
	ret = acpiphp_disable_and_eject_slot(slot);
	pci_unlock_rescan_remove();
	acpi_scan_lock_release();
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
34
94.44%
2
66.67%
Takayoshi Kouchi
2
5.56%
1
33.33%
Total
36
100.00%
3
100.00%

/*
 * slot enabled:  1
 * slot disabled: 0
 */


u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
{
	return (slot->flags & SLOT_ENABLED);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Takayoshi Kouchi
15
78.95%
1
33.33%
Rajesh Shah
3
15.79%
1
33.33%
Rafael J. Wysocki
1
5.26%
1
33.33%
Total
19
100.00%
3
100.00%

/*
 * latch   open:  1
 * latch closed:  0
 */


u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
{
	return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Takayoshi Kouchi
17
80.95%
1
33.33%
Mika Westerberg
3
14.29%
1
33.33%
Jiang Liu
1
4.76%
1
33.33%
Total
21
100.00%
3
100.00%

/*
 * adapter presence : 1
 *          absence : 0
 */


u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
{
	return !!get_slot_status(slot);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Takayoshi Kouchi
15
83.33%
1
50.00%
Mika Westerberg
3
16.67%
1
50.00%
Total
18
100.00%
2
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Rafael J. Wysocki
1663
45.35%
59
45.74%
Takayoshi Kouchi
460
12.54%
2
1.55%
Jiang Liu
322
8.78%
6
4.65%
Rajesh Shah
245
6.68%
4
3.10%
Kristen Carlson Accardi
215
5.86%
6
4.65%
Yinghai Lu
115
3.14%
4
3.10%
David Shaohua Li
107
2.92%
1
0.78%
Mika Westerberg
93
2.54%
3
2.33%
Björn Helgaas
78
2.13%
4
3.10%
Greg Kroah-Hartman
58
1.58%
4
3.10%
Yijing Wang
46
1.25%
4
3.10%
Alexander Chiang
45
1.23%
4
3.10%
Jianjun (Amos) Kong
44
1.20%
1
0.78%
MUNEDA Takahiro
39
1.06%
4
3.10%
Ian Campbell
24
0.65%
1
0.78%
Prarit Bhargava
17
0.46%
1
0.78%
Kenji Kaneshige
15
0.41%
1
0.78%
Amos Kong
11
0.30%
1
0.78%
Kirill A. Shutemov
11
0.30%
1
0.78%
Lan Tianyu
10
0.27%
1
0.78%
Satoru Takeuchi
7
0.19%
2
1.55%
Toshi Kani
6
0.16%
1
0.78%
Lukas Wunner
5
0.14%
1
0.78%
Insu Yun
5
0.14%
1
0.78%
Matthew Garrett
4
0.11%
1
0.78%
Gary Hade
4
0.11%
1
0.78%
Herbert Xu
3
0.08%
1
0.78%
Tejun Heo
3
0.08%
1
0.78%
Randy Dunlap
3
0.08%
1
0.78%
Matthew Wilcox
2
0.05%
1
0.78%
Ryan Desfosses
2
0.05%
1
0.78%
Wei Yongjun
1
0.03%
1
0.78%
Harvey Harrison
1
0.03%
1
0.78%
Andy Grover
1
0.03%
1
0.78%
Eric Sesterhenn / Snakebyte
1
0.03%
1
0.78%
Justin Chen
1
0.03%
1
0.78%
Total
3667
100.00%
129
100.00%
Directory: drivers/pci/hotplug

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