[mirror_ubuntu-artful-kernel.git] / drivers / pci / pcie / aer / aerdrv.c

/*
 * drivers/pci/pcie/aer/aerdrv.c
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * This file implements the AER root port service driver. The driver will
 * register an irq handler. When root port triggers an AER interrupt, the irq
 * handler will collect root port status and schedule a work.
 *
 * Copyright (C) 2006 Intel Corp.
 *	Tom Long Nguyen (tom.l.nguyen@intel.com)
 *	Zhang Yanmin (yanmin.zhang@intel.com)
 *
 */

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/pm.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/pcieport_if.h>
#include <linux/slab.h>

#include "aerdrv.h"
#include "../../pci.h"

/*
 * Version Information
 */
#define DRIVER_VERSION "v1.0"
#define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
#define DRIVER_DESC "Root Port Advanced Error Reporting Driver"
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

static int __devinit aer_probe(struct pcie_device *dev);
static void aer_remove(struct pcie_device *dev);
static pci_ers_result_t aer_error_detected(struct pci_dev *dev,
	enum pci_channel_state error);
static void aer_error_resume(struct pci_dev *dev);
static pci_ers_result_t aer_root_reset(struct pci_dev *dev);

static struct pci_error_handlers aer_error_handlers = {
	.error_detected = aer_error_detected,
	.resume		= aer_error_resume,
};

static struct pcie_port_service_driver aerdriver = {
	.name		= "aer",
	.port_type	= PCI_EXP_TYPE_ROOT_PORT,
	.service	= PCIE_PORT_SERVICE_AER,

	.probe		= aer_probe,
	.remove		= aer_remove,

	.err_handler	= &aer_error_handlers,

	.reset_link	= aer_root_reset,
};

static int pcie_aer_disable;

void pci_no_aer(void)
{
	pcie_aer_disable = 1;	/* has priority over 'forceload' */
}

/**
 * aer_irq - Root Port's ISR
 * @irq: IRQ assigned to Root Port
 * @context: pointer to Root Port data structure
 *
 * Invoked when Root Port detects AER messages.
 **/
irqreturn_t aer_irq(int irq, void *context)
{
	unsigned int status, id;
	struct pcie_device *pdev = (struct pcie_device *)context;
	struct aer_rpc *rpc = get_service_data(pdev);
	int next_prod_idx;
	unsigned long flags;
	int pos;

	pos = pci_find_ext_capability(pdev->port, PCI_EXT_CAP_ID_ERR);
	/*
	 * Must lock access to Root Error Status Reg, Root Error ID Reg,
	 * and Root error producer/consumer index
	 */
	spin_lock_irqsave(&rpc->e_lock, flags);

	/* Read error status */
	pci_read_config_dword(pdev->port, pos + PCI_ERR_ROOT_STATUS, &status);
	if (!(status & ROOT_ERR_STATUS_MASKS)) {
		spin_unlock_irqrestore(&rpc->e_lock, flags);
		return IRQ_NONE;
	}

	/* Read error source and clear error status */
	pci_read_config_dword(pdev->port, pos + PCI_ERR_ROOT_COR_SRC, &id);
	pci_write_config_dword(pdev->port, pos + PCI_ERR_ROOT_STATUS, status);

	/* Store error source for later DPC handler */
	next_prod_idx = rpc->prod_idx + 1;
	if (next_prod_idx == AER_ERROR_SOURCES_MAX)
		next_prod_idx = 0;
	if (next_prod_idx == rpc->cons_idx) {
		/*
		 * Error Storm Condition - possibly the same error occurred.
		 * Drop the error.
		 */
		spin_unlock_irqrestore(&rpc->e_lock, flags);
		return IRQ_HANDLED;
	}
	rpc->e_sources[rpc->prod_idx].status =  status;
	rpc->e_sources[rpc->prod_idx].id = id;
	rpc->prod_idx = next_prod_idx;
	spin_unlock_irqrestore(&rpc->e_lock, flags);

	/*  Invoke DPC handler */
	schedule_work(&rpc->dpc_handler);

	return IRQ_HANDLED;
}
EXPORT_SYMBOL_GPL(aer_irq);

/**
 * aer_alloc_rpc - allocate Root Port data structure
 * @dev: pointer to the pcie_dev data structure
 *
 * Invoked when Root Port's AER service is loaded.
 **/
static struct aer_rpc *aer_alloc_rpc(struct pcie_device *dev)
{
	struct aer_rpc *rpc;

	rpc = kzalloc(sizeof(struct aer_rpc), GFP_KERNEL);
	if (!rpc)
		return NULL;

	/*
	 * Initialize Root lock access, e_lock, to Root Error Status Reg,
	 * Root Error ID Reg, and Root error producer/consumer index.
	 */
	spin_lock_init(&rpc->e_lock);

	rpc->rpd = dev;
	INIT_WORK(&rpc->dpc_handler, aer_isr);
	rpc->prod_idx = rpc->cons_idx = 0;
	mutex_init(&rpc->rpc_mutex);
	init_waitqueue_head(&rpc->wait_release);

	/* Use PCIe bus function to store rpc into PCIe device */
	set_service_data(dev, rpc);

	return rpc;
}

/**
 * aer_remove - clean up resources
 * @dev: pointer to the pcie_dev data structure
 *
 * Invoked when PCI Express bus unloads or AER probe fails.
 **/
static void aer_remove(struct pcie_device *dev)
{
	struct aer_rpc *rpc = get_service_data(dev);

	if (rpc) {
		/* If register interrupt service, it must be free. */
		if (rpc->isr)
			free_irq(dev->irq, dev);

		wait_event(rpc->wait_release, rpc->prod_idx == rpc->cons_idx);

		aer_delete_rootport(rpc);
		set_service_data(dev, NULL);
	}
}

/**
 * aer_probe - initialize resources
 * @dev: pointer to the pcie_dev data structure
 * @id: pointer to the service id data structure
 *
 * Invoked when PCI Express bus loads AER service driver.
 **/
static int __devinit aer_probe(struct pcie_device *dev)
{
	int status;
	struct aer_rpc *rpc;
	struct device *device = &dev->device;

	/* Init */
	status = aer_init(dev);
	if (status)
		return status;

	/* Alloc rpc data structure */
	rpc = aer_alloc_rpc(dev);
	if (!rpc) {
		dev_printk(KERN_DEBUG, device, "alloc rpc failed\n");
		aer_remove(dev);
		return -ENOMEM;
	}

	/* Request IRQ ISR */
	status = request_irq(dev->irq, aer_irq, IRQF_SHARED, "aerdrv", dev);
	if (status) {
		dev_printk(KERN_DEBUG, device, "request IRQ failed\n");
		aer_remove(dev);
		return status;
	}

	rpc->isr = 1;

	aer_enable_rootport(rpc);

	return status;
}

/**
 * aer_root_reset - reset link on Root Port
 * @dev: pointer to Root Port's pci_dev data structure
 *
 * Invoked by Port Bus driver when performing link reset at Root Port.
 **/
static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
{
	u16 p2p_ctrl;
	u32 status;
	int pos;

	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);

	/* Disable Root's interrupt in response to error messages */
	pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, 0);

	/* Assert Secondary Bus Reset */
	pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &p2p_ctrl);
	p2p_ctrl |= PCI_CB_BRIDGE_CTL_CB_RESET;
	pci_write_config_word(dev, PCI_BRIDGE_CONTROL, p2p_ctrl);

	/* De-assert Secondary Bus Reset */
	p2p_ctrl &= ~PCI_CB_BRIDGE_CTL_CB_RESET;
	pci_write_config_word(dev, PCI_BRIDGE_CONTROL, p2p_ctrl);

	/*
	 * System software must wait for at least 100ms from the end
	 * of a reset of one or more device before it is permitted
	 * to issue Configuration Requests to those devices.
	 */
	msleep(200);
	dev_printk(KERN_DEBUG, &dev->dev, "Root Port link has been reset\n");

	/* Enable Root Port's interrupt in response to error messages */
	pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &status);
	pci_write_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, status);
	pci_write_config_dword(dev,
		pos + PCI_ERR_ROOT_COMMAND,
		ROOT_PORT_INTR_ON_MESG_MASK);

	return PCI_ERS_RESULT_RECOVERED;
}

/**
 * aer_error_detected - update severity status
 * @dev: pointer to Root Port's pci_dev data structure
 * @error: error severity being notified by port bus
 *
 * Invoked by Port Bus driver during error recovery.
 **/
static pci_ers_result_t aer_error_detected(struct pci_dev *dev,
			enum pci_channel_state error)
{
	/* Root Port has no impact. Always recovers. */
	return PCI_ERS_RESULT_CAN_RECOVER;
}

/**
 * aer_error_resume - clean up corresponding error status bits
 * @dev: pointer to Root Port's pci_dev data structure
 *
 * Invoked by Port Bus driver during nonfatal recovery.
 **/
static void aer_error_resume(struct pci_dev *dev)
{
	int pos;
	u32 status, mask;
	u16 reg16;

	/* Clean up Root device status */
	pos = pci_pcie_cap(dev);
	pci_read_config_word(dev, pos + PCI_EXP_DEVSTA, &reg16);
	pci_write_config_word(dev, pos + PCI_EXP_DEVSTA, reg16);

	/* Clean AER Root Error Status */
	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &mask);
	if (dev->error_state == pci_channel_io_normal)
		status &= ~mask; /* Clear corresponding nonfatal bits */
	else
		status &= mask; /* Clear corresponding fatal bits */
	pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
}

/**
 * aer_service_init - register AER root service driver
 *
 * Invoked when AER root service driver is loaded.
 **/
static int __init aer_service_init(void)
{
	if (pcie_aer_disable)
		return -ENXIO;
	if (!pci_msi_enabled())
		return -ENXIO;
	return pcie_port_service_register(&aerdriver);
}

/**
 * aer_service_exit - unregister AER root service driver
 *
 * Invoked when AER root service driver is unloaded.
 **/
static void __exit aer_service_exit(void)
{
	pcie_port_service_unregister(&aerdriver);
}

module_init(aer_service_init);
module_exit(aer_service_exit);
Commit	Line	Data
6c2b374d ZY	1	/*
	2	* drivers/pci/pcie/aer/aerdrv.c
	3	*
	4	* This file is subject to the terms and conditions of the GNU General Public
	5	* License. See the file "COPYING" in the main directory of this archive
	6	* for more details.
	7	*
	8	* This file implements the AER root port service driver. The driver will
	9	* register an irq handler. When root port triggers an AER interrupt, the irq
	10	* handler will collect root port status and schedule a work.
	11	*
	12	* Copyright (C) 2006 Intel Corp.
	13	* Tom Long Nguyen (tom.l.nguyen@intel.com)
	14	* Zhang Yanmin (yanmin.zhang@intel.com)
	15	*
	16	*/
	17
	18	#include <linux/module.h>
	19	#include <linux/pci.h>
d43c36dc	20	#include <linux/sched.h>
6c2b374d ZY	21	#include <linux/kernel.h>
	22	#include <linux/errno.h>
	23	#include <linux/pm.h>
	24	#include <linux/init.h>
	25	#include <linux/interrupt.h>
	26	#include <linux/delay.h>
	27	#include <linux/pcieport_if.h>
5a0e3ad6	28	#include <linux/slab.h>
6c2b374d ZY	29
6c2b374d ZY	30	#include "aerdrv.h"
5d9526d0	31	#include "../../pci.h"
6c2b374d ZY	32
	33	/*
	34	* Version Information
	35	*/
	36	#define DRIVER_VERSION "v1.0"
	37	#define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
	38	#define DRIVER_DESC "Root Port Advanced Error Reporting Driver"
	39	MODULE_AUTHOR(DRIVER_AUTHOR);
	40	MODULE_DESCRIPTION(DRIVER_DESC);
	41	MODULE_LICENSE("GPL");
	42
c9a91883	43	static int __devinit aer_probe(struct pcie_device *dev);
6c2b374d	44	static void aer_remove(struct pcie_device *dev);
6c2b374d ZY	45	static pci_ers_result_t aer_error_detected(struct pci_dev *dev,
	46	enum pci_channel_state error);
	47	static void aer_error_resume(struct pci_dev *dev);
	48	static pci_ers_result_t aer_root_reset(struct pci_dev *dev);
	49
6c2b374d ZY	50	static struct pci_error_handlers aer_error_handlers = {
6c2b374d ZY	51	.error_detected = aer_error_detected,
c9a91883	52	.resume = aer_error_resume,
6c2b374d ZY	53	};
6c2b374d ZY	54
c1996c27	55	static struct pcie_port_service_driver aerdriver = {
6c2b374d	56	.name = "aer",
694f88ef	57	.port_type = PCI_EXP_TYPE_ROOT_PORT,
22106368	58	.service = PCIE_PORT_SERVICE_AER,
6c2b374d ZY	59
	60	.probe = aer_probe,
	61	.remove = aer_remove,
	62
6c2b374d ZY	63	.err_handler = &aer_error_handlers,
	64
	65	.reset_link = aer_root_reset,
	66	};
	67
7f785763 RD	68	static int pcie_aer_disable;
	69
	70	void pci_no_aer(void)
	71	{
	72	pcie_aer_disable = 1; /* has priority over 'forceload' */
	73	}
	74
6c2b374d ZY	75	/**
	76	* aer_irq - Root Port's ISR
	77	* @irq: IRQ assigned to Root Port
	78	* @context: pointer to Root Port data structure
6c2b374d ZY	79	*
	80	* Invoked when Root Port detects AER messages.
	81	**/
634deb02	82	irqreturn_t aer_irq(int irq, void *context)
6c2b374d ZY	83	{
	84	unsigned int status, id;
	85	struct pcie_device pdev = (struct pcie_device )context;
	86	struct aer_rpc *rpc = get_service_data(pdev);
	87	int next_prod_idx;
	88	unsigned long flags;
	89	int pos;
	90
0927678f	91	pos = pci_find_ext_capability(pdev->port, PCI_EXT_CAP_ID_ERR);
6c2b374d ZY	92	/*
	93	* Must lock access to Root Error Status Reg, Root Error ID Reg,
	94	* and Root error producer/consumer index
	95	*/
	96	spin_lock_irqsave(&rpc->e_lock, flags);
	97
	98	/* Read error status */
	99	pci_read_config_dword(pdev->port, pos + PCI_ERR_ROOT_STATUS, &status);
	100	if (!(status & ROOT_ERR_STATUS_MASKS)) {
	101	spin_unlock_irqrestore(&rpc->e_lock, flags);
	102	return IRQ_NONE;
	103	}
	104
	105	/* Read error source and clear error status */
	106	pci_read_config_dword(pdev->port, pos + PCI_ERR_ROOT_COR_SRC, &id);
	107	pci_write_config_dword(pdev->port, pos + PCI_ERR_ROOT_STATUS, status);
	108
	109	/* Store error source for later DPC handler */
	110	next_prod_idx = rpc->prod_idx + 1;
	111	if (next_prod_idx == AER_ERROR_SOURCES_MAX)
	112	next_prod_idx = 0;
	113	if (next_prod_idx == rpc->cons_idx) {
	114	/*
	115	* Error Storm Condition - possibly the same error occurred.
	116	* Drop the error.
	117	*/
	118	spin_unlock_irqrestore(&rpc->e_lock, flags);
	119	return IRQ_HANDLED;
	120	}
	121	rpc->e_sources[rpc->prod_idx].status = status;
	122	rpc->e_sources[rpc->prod_idx].id = id;
	123	rpc->prod_idx = next_prod_idx;
	124	spin_unlock_irqrestore(&rpc->e_lock, flags);
	125
	126	/* Invoke DPC handler */
	127	schedule_work(&rpc->dpc_handler);
	128
	129	return IRQ_HANDLED;
	130	}
634deb02	131	EXPORT_SYMBOL_GPL(aer_irq);
6c2b374d ZY	132
	133	/**
	134	* aer_alloc_rpc - allocate Root Port data structure
	135	* @dev: pointer to the pcie_dev data structure
	136	*
	137	* Invoked when Root Port's AER service is loaded.
	138	**/
c9a91883	139	static struct aer_rpc aer_alloc_rpc(struct pcie_device dev)
6c2b374d ZY	140	{
	141	struct aer_rpc *rpc;
	142
c9a91883 HS	143	rpc = kzalloc(sizeof(struct aer_rpc), GFP_KERNEL);
c9a91883 HS	144	if (!rpc)
6c2b374d ZY	145	return NULL;
6c2b374d ZY	146
6c2b374d ZY	147	/*
	148	* Initialize Root lock access, e_lock, to Root Error Status Reg,
	149	* Root Error ID Reg, and Root error producer/consumer index.
	150	*/
f5609d7e	151	spin_lock_init(&rpc->e_lock);
6c2b374d ZY	152
6c2b374d ZY	153	rpc->rpd = dev;
65f27f38	154	INIT_WORK(&rpc->dpc_handler, aer_isr);
6c2b374d ZY	155	rpc->prod_idx = rpc->cons_idx = 0;
	156	mutex_init(&rpc->rpc_mutex);
	157	init_waitqueue_head(&rpc->wait_release);
	158
45e829ea	159	/* Use PCIe bus function to store rpc into PCIe device */
6c2b374d ZY	160	set_service_data(dev, rpc);
	161
	162	return rpc;
	163	}
	164
	165	/**
	166	* aer_remove - clean up resources
	167	* @dev: pointer to the pcie_dev data structure
	168	*
	169	* Invoked when PCI Express bus unloads or AER probe fails.
	170	**/
	171	static void aer_remove(struct pcie_device *dev)
	172	{
	173	struct aer_rpc *rpc = get_service_data(dev);
	174
	175	if (rpc) {
	176	/* If register interrupt service, it must be free. */
	177	if (rpc->isr)
	178	free_irq(dev->irq, dev);
	179
	180	wait_event(rpc->wait_release, rpc->prod_idx == rpc->cons_idx);
	181
	182	aer_delete_rootport(rpc);
	183	set_service_data(dev, NULL);
	184	}
	185	}
	186
	187	/**
	188	* aer_probe - initialize resources
	189	* @dev: pointer to the pcie_dev data structure
	190	* @id: pointer to the service id data structure
	191	*
	192	* Invoked when PCI Express bus loads AER service driver.
	193	**/
c9a91883	194	static int __devinit aer_probe(struct pcie_device *dev)
6c2b374d ZY	195	{
	196	int status;
	197	struct aer_rpc *rpc;
	198	struct device *device = &dev->device;
	199
	200	/* Init */
c9a91883 HS	201	status = aer_init(dev);
c9a91883 HS	202	if (status)
6c2b374d ZY	203	return status;
	204
	205	/* Alloc rpc data structure */
c9a91883 HS	206	rpc = aer_alloc_rpc(dev);
c9a91883 HS	207	if (!rpc) {
531f254e	208	dev_printk(KERN_DEBUG, device, "alloc rpc failed\n");
6c2b374d ZY	209	aer_remove(dev);
	210	return -ENOMEM;
	211	}
	212
	213	/* Request IRQ ISR */
c9a91883 HS	214	status = request_irq(dev->irq, aer_irq, IRQF_SHARED, "aerdrv", dev);
c9a91883 HS	215	if (status) {
531f254e	216	dev_printk(KERN_DEBUG, device, "request IRQ failed\n");
6c2b374d ZY	217	aer_remove(dev);
	218	return status;
	219	}
	220
	221	rpc->isr = 1;
	222
	223	aer_enable_rootport(rpc);
	224
	225	return status;
	226	}
	227
	228	/**
	229	* aer_root_reset - reset link on Root Port
	230	* @dev: pointer to Root Port's pci_dev data structure
	231	*
	232	* Invoked by Port Bus driver when performing link reset at Root Port.
	233	**/
	234	static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
	235	{
	236	u16 p2p_ctrl;
	237	u32 status;
	238	int pos;
	239
0927678f	240	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
6c2b374d ZY	241
	242	/* Disable Root's interrupt in response to error messages */
	243	pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, 0);
	244
	245	/* Assert Secondary Bus Reset */
	246	pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &p2p_ctrl);
	247	p2p_ctrl \|= PCI_CB_BRIDGE_CTL_CB_RESET;
	248	pci_write_config_word(dev, PCI_BRIDGE_CONTROL, p2p_ctrl);
	249
	250	/* De-assert Secondary Bus Reset */
	251	p2p_ctrl &= ~PCI_CB_BRIDGE_CTL_CB_RESET;
	252	pci_write_config_word(dev, PCI_BRIDGE_CONTROL, p2p_ctrl);
	253
	254	/*
	255	* System software must wait for at least 100ms from the end
	256	* of a reset of one or more device before it is permitted
	257	* to issue Configuration Requests to those devices.
	258	*/
	259	msleep(200);
531f254e	260	dev_printk(KERN_DEBUG, &dev->dev, "Root Port link has been reset\n");
6c2b374d ZY	261
	262	/* Enable Root Port's interrupt in response to error messages */
	263	pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &status);
	264	pci_write_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, status);
	265	pci_write_config_dword(dev,
	266	pos + PCI_ERR_ROOT_COMMAND,
	267	ROOT_PORT_INTR_ON_MESG_MASK);
	268
	269	return PCI_ERS_RESULT_RECOVERED;
	270	}
	271
	272	/**
	273	* aer_error_detected - update severity status
	274	* @dev: pointer to Root Port's pci_dev data structure
	275	* @error: error severity being notified by port bus
	276	*
	277	* Invoked by Port Bus driver during error recovery.
	278	**/
	279	static pci_ers_result_t aer_error_detected(struct pci_dev *dev,
	280	enum pci_channel_state error)
	281	{
	282	/* Root Port has no impact. Always recovers. */
	283	return PCI_ERS_RESULT_CAN_RECOVER;
	284	}
	285
	286	/**
	287	* aer_error_resume - clean up corresponding error status bits
	288	* @dev: pointer to Root Port's pci_dev data structure
	289	*
	290	* Invoked by Port Bus driver during nonfatal recovery.
	291	**/
	292	static void aer_error_resume(struct pci_dev *dev)
	293	{
	294	int pos;
	295	u32 status, mask;
	296	u16 reg16;
	297
	298	/* Clean up Root device status */
39a53062	299	pos = pci_pcie_cap(dev);
6c2b374d ZY	300	pci_read_config_word(dev, pos + PCI_EXP_DEVSTA, &reg16);
	301	pci_write_config_word(dev, pos + PCI_EXP_DEVSTA, reg16);
	302
	303	/* Clean AER Root Error Status */
0927678f	304	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
6c2b374d ZY	305	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
	306	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &mask);
	307	if (dev->error_state == pci_channel_io_normal)
	308	status &= ~mask; /* Clear corresponding nonfatal bits */
	309	else
	310	status &= mask; /* Clear corresponding fatal bits */
	311	pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
	312	}
	313
	314	/**
	315	* aer_service_init - register AER root service driver
	316	*
	317	* Invoked when AER root service driver is loaded.
	318	**/
	319	static int __init aer_service_init(void)
	320	{
7f785763 RD	321	if (pcie_aer_disable)
7f785763 RD	322	return -ENXIO;
3e77a3f7 AK	323	if (!pci_msi_enabled())
3e77a3f7 AK	324	return -ENXIO;
c1996c27	325	return pcie_port_service_register(&aerdriver);
6c2b374d ZY	326	}
	327
	328	/**
	329	* aer_service_exit - unregister AER root service driver
	330	*
	331	* Invoked when AER root service driver is unloaded.
	332	**/
	333	static void __exit aer_service_exit(void)
	334	{
c1996c27	335	pcie_port_service_unregister(&aerdriver);
6c2b374d ZY	336	}
	337
	338	module_init(aer_service_init);
	339	module_exit(aer_service_exit);