Release 4.11 drivers/pci/hotplug/pciehp_core.c

/*
 * PCI Express Hot Plug Controller Driver
 *
 * Copyright (C) 1995,2001 Compaq Computer Corporation
 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
 * Copyright (C) 2001 IBM Corp.
 * Copyright (C) 2003-2004 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 <greg@kroah.com>, <kristen.c.accardi@intel.com>
 *
 * Authors:
 *   Dan Zink <dan.zink@compaq.com>
 *   Greg Kroah-Hartman <greg@kroah.com>
 *   Dely Sy <dely.l.sy@intel.com>"
 */

#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/pci.h>
#include "pciehp.h"
#include <linux/interrupt.h>
#include <linux/time.h>

/* Global variables */

bool pciehp_debug;

bool pciehp_poll_mode;

int pciehp_poll_time;

static bool pciehp_force;

/*
 * not really modular, but the easiest way to keep compat with existing
 * bootargs behaviour is to continue using module_param here.
 */
module_param(pciehp_debug, bool, 0644);
module_param(pciehp_poll_mode, bool, 0644);
module_param(pciehp_poll_time, int, 0644);
module_param(pciehp_force, bool, 0644);
MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if OSHP is missing");


#define PCIE_MODULE_NAME "pciehp"

static int set_attention_status(struct hotplug_slot *slot, u8 value);
static int enable_slot(struct hotplug_slot *slot);
static int disable_slot(struct hotplug_slot *slot);
static int get_power_status(struct hotplug_slot *slot, u8 *value);
static int get_attention_status(struct hotplug_slot *slot, u8 *value);
static int get_latch_status(struct hotplug_slot *slot, u8 *value);
static int get_adapter_status(struct hotplug_slot *slot, u8 *value);
static int reset_slot(struct hotplug_slot *slot, int probe);

/**
 * release_slot - free up the memory used by a slot
 * @hotplug_slot: slot to free
 */


static void release_slot(struct hotplug_slot *hotplug_slot)
{
	kfree(hotplug_slot->ops);
	kfree(hotplug_slot->info);
	kfree(hotplug_slot);
}

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Kenji Kaneshige
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static int init_slot(struct controller *ctrl)
{
	struct slot *slot = ctrl->slot;
	struct hotplug_slot *hotplug = NULL;
	struct hotplug_slot_info *info = NULL;
	struct hotplug_slot_ops *ops = NULL;
	char name[SLOT_NAME_SIZE];
	int retval = -ENOMEM;

	hotplug = kzalloc(sizeof(*hotplug), GFP_KERNEL);
	if (!hotplug)
		goto out;

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info)
		goto out;

	/* Setup hotplug slot ops */
	ops = kzalloc(sizeof(*ops), GFP_KERNEL);
	if (!ops)
		goto out;

	ops->enable_slot = enable_slot;
	ops->disable_slot = disable_slot;
	ops->get_power_status = get_power_status;
	ops->get_adapter_status = get_adapter_status;
	ops->reset_slot = reset_slot;
	if (MRL_SENS(ctrl))
		ops->get_latch_status = get_latch_status;
	if (ATTN_LED(ctrl)) {
		ops->get_attention_status = get_attention_status;
		ops->set_attention_status = set_attention_status;
	} else if (ctrl->pcie->port->hotplug_user_indicators) {
		ops->get_attention_status = pciehp_get_raw_indicator_status;
		ops->set_attention_status = pciehp_set_raw_indicator_status;
	}

	/* register this slot with the hotplug pci core */
	hotplug->info = info;
	hotplug->private = slot;
	hotplug->release = &release_slot;
	hotplug->ops = ops;
	slot->hotplug_slot = hotplug;
	snprintf(name, SLOT_NAME_SIZE, "%u", PSN(ctrl));

	retval = pci_hp_register(hotplug,
				 ctrl->pcie->port->subordinate, 0, name);
	if (retval)
		ctrl_err(ctrl, "pci_hp_register failed: error %d\n", retval);
out:
	if (retval) {
		kfree(ops);
		kfree(info);
		kfree(hotplug);
	}
	return retval;
}

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Kenji Kaneshige
143
46.13%
8
36.36%
Dely Sy
73
23.55%
2
9.09%
Alexander Chiang
26
8.39%
4
18.18%
Keith Busch
25
8.06%
1
4.55%
Rolf Eike Beer
20
6.45%
2
9.09%
Jesper Juhl
11
3.55%
1
4.55%
Alex Williamson
6
1.94%
1
4.55%
Taku Izumi
3
0.97%
1
4.55%
Eric Sesterhenn / Snakebyte
2
0.65%
1
4.55%
Björn Helgaas
1
0.32%
1
4.55%
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310
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static void cleanup_slot(struct controller *ctrl)
{
	pci_hp_deregister(ctrl->slot->hotplug_slot);
}

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Dely Sy
15
75.00%
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33.33%
Kenji Kaneshige
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3
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/*
 * set_attention_status - Turns the Amber LED for a slot on, off or blink
 */


static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
{
	struct slot *slot = hotplug_slot->private;

	pciehp_set_attention_status(slot, status);
	return 0;
}


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Dely Sy
27
81.82%
1
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Björn Helgaas
3
9.09%
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Rolf Eike Beer
2
6.06%
1
25.00%
Kenji Kaneshige
1
3.03%
1
25.00%
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33
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4
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static int enable_slot(struct hotplug_slot *hotplug_slot)
{
	struct slot *slot = hotplug_slot->private;

	return pciehp_sysfs_enable_slot(slot);
}


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Dely Sy
23
88.46%
1
33.33%
Rolf Eike Beer
2
7.69%
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Kenji Kaneshige
1
3.85%
1
33.33%
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26
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static int disable_slot(struct hotplug_slot *hotplug_slot)
{
	struct slot *slot = hotplug_slot->private;

	return pciehp_sysfs_disable_slot(slot);
}

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Dely Sy
23
88.46%
1
33.33%
Rolf Eike Beer
2
7.69%
1
33.33%
Kenji Kaneshige
1
3.85%
1
33.33%
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26
100.00%
3
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static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;

	pciehp_get_power_status(slot, value);
	return 0;
}

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Dely Sy
28
82.35%
1
25.00%
Björn Helgaas
3
8.82%
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2
5.88%
1
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1
2.94%
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25.00%
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34
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4
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static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;

	pciehp_get_attention_status(slot, value);
	return 0;
}

Contributors
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Dely Sy
28
82.35%
1
25.00%
Björn Helgaas
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8.82%
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5.88%
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static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;

	pciehp_get_latch_status(slot, value);
	return 0;
}

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Dely Sy
28
82.35%
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25.00%
Björn Helgaas
3
8.82%
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static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;

	pciehp_get_adapter_status(slot, value);
	return 0;
}

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28
82.35%
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Björn Helgaas
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8.82%
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1
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static int reset_slot(struct hotplug_slot *hotplug_slot, int probe)
{
	struct slot *slot = hotplug_slot->private;

	return pciehp_reset_slot(slot, probe);
}

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static int pciehp_probe(struct pcie_device *dev)
{
	int rc;
	struct controller *ctrl;
	struct slot *slot;
	u8 occupied, poweron;

	/* If this is not a "hotplug" service, we have no business here. */
	if (dev->service != PCIE_PORT_SERVICE_HP)
		return -ENODEV;

	if (!dev->port->subordinate) {
		/* Can happen if we run out of bus numbers during probe */
		dev_err(&dev->device,
			"Hotplug bridge without secondary bus, ignoring\n");
		return -ENODEV;
	}

	ctrl = pcie_init(dev);
	if (!ctrl) {
		dev_err(&dev->device, "Controller initialization failed\n");
		return -ENODEV;
	}
	set_service_data(dev, ctrl);

	/* Setup the slot information structures */
	rc = init_slot(ctrl);
	if (rc) {
		if (rc == -EBUSY)
			ctrl_warn(ctrl, "Slot already registered by another hotplug driver\n");
		else
			ctrl_err(ctrl, "Slot initialization failed (%d)\n", rc);
		goto err_out_release_ctlr;
	}

	/* Enable events after we have setup the data structures */
	rc = pcie_init_notification(ctrl);
	if (rc) {
		ctrl_err(ctrl, "Notification initialization failed (%d)\n", rc);
		goto err_out_free_ctrl_slot;
	}

	/* Check if slot is occupied */
	slot = ctrl->slot;
	pciehp_get_adapter_status(slot, &occupied);
	pciehp_get_power_status(slot, &poweron);
	if (occupied && pciehp_force) {
		mutex_lock(&slot->hotplug_lock);
		pciehp_enable_slot(slot);
		mutex_unlock(&slot->hotplug_lock);
	}
	/* If empty slot's power status is on, turn power off */
	if (!occupied && poweron && POWER_CTRL(ctrl))
		pciehp_power_off_slot(slot);

	return 0;

err_out_free_ctrl_slot:
	cleanup_slot(ctrl);
err_out_release_ctlr:
	pciehp_release_ctrl(ctrl);
	return -ENODEV;
}

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Dely Sy
95
36.40%
2
8.33%
Kenji Kaneshige
48
18.39%
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Andreas Noever
22
8.43%
1
4.17%
Eric W. Biedermann
22
8.43%
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Rajat Jain
18
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Rafael J. Wysocki
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Alexander Chiang
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Taku Izumi
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Tom L. Nguyen
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static void pciehp_remove(struct pcie_device *dev)
{
	struct controller *ctrl = get_service_data(dev);

	cleanup_slot(ctrl);
	pciehp_release_ctrl(ctrl);
}

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18
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#ifdef CONFIG_PM


static int pciehp_suspend(struct pcie_device *dev)
{
	return 0;
}

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static int pciehp_resume(struct pcie_device *dev)
{
	struct controller *ctrl;
	struct slot *slot;
	u8 status;

	ctrl = get_service_data(dev);

	/* reinitialize the chipset's event detection logic */
	pcie_enable_notification(ctrl);

	slot = ctrl->slot;

	/* Check if slot is occupied */
	pciehp_get_adapter_status(slot, &status);
	mutex_lock(&slot->hotplug_lock);
	if (status)
		pciehp_enable_slot(slot);
	else
		pciehp_disable_slot(slot);
	mutex_unlock(&slot->hotplug_lock);
	return 0;
}
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Rajat Jain
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Oliver Neukum
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#endif /* PM */


static struct pcie_port_service_driver hpdriver_portdrv = {
	.name		= PCIE_MODULE_NAME,
	.port_type	= PCIE_ANY_PORT,
	.service	= PCIE_PORT_SERVICE_HP,

	.probe		= pciehp_probe,
	.remove		= pciehp_remove,

#ifdef	CONFIG_PM
	.suspend	= pciehp_suspend,
	.resume		= pciehp_resume,
#endif	/* PM */
};



static int __init pcied_init(void)
{
	int retval = 0;

	retval = pcie_port_service_register(&hpdriver_portdrv);
	dbg("pcie_port_service_register = %d\n", retval);
	if (retval)
		dbg("Failure to register service\n");

	return retval;
}
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device_initcall(pcied_init);
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6.67%
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17.62%
19
31.67%
Tom L. Nguyen
76
5.77%
1
1.67%
Alex Williamson
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1.67%
Rolf Eike Beer
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3.49%
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6.67%
Mark Lord
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2.89%
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3.33%
Alexander Chiang
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2.89%
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6.67%
Rajat Jain
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2.58%
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Keith Busch
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1.90%
1
1.67%
Rafael J. Wysocki
23
1.75%
5
8.33%
Björn Helgaas
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1.75%
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5.00%
Andreas Noever
22
1.67%
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1.67%
Eric W. Biedermann
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1.67%
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1.67%
Rajesh Shah
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1.29%
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Oliver Neukum
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Taku Izumi
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1.06%
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Rusty Russell
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Tejun Heo
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Kristen Carlson Accardi
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0.23%
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Eric Sesterhenn / Snakebyte
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Paul Gortmaker
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Directory: drivers/pci/hotplug

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