[net-next-2.6.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' */
}

bool pci_aer_available(void)
{
	return !pcie_aer_disable && pci_msi_enabled();
}

static int set_device_error_reporting(struct pci_dev *dev, void *data)
{
	bool enable = *((bool *)data);

	if ((dev->pcie_type == PCI_EXP_TYPE_ROOT_PORT) ||
	    (dev->pcie_type == PCI_EXP_TYPE_UPSTREAM) ||
	    (dev->pcie_type == PCI_EXP_TYPE_DOWNSTREAM)) {
		if (enable)
			pci_enable_pcie_error_reporting(dev);
		else
			pci_disable_pcie_error_reporting(dev);
	}

	if (enable)
		pcie_set_ecrc_checking(dev);

	return 0;
}

/**
 * set_downstream_devices_error_reporting - enable/disable the error reporting  bits on the root port and its downstream ports.
 * @dev: pointer to root port's pci_dev data structure
 * @enable: true = enable error reporting, false = disable error reporting.
 */
static void set_downstream_devices_error_reporting(struct pci_dev *dev,
						   bool enable)
{
	set_device_error_reporting(dev, &enable);

	if (!dev->subordinate)
		return;
	pci_walk_bus(dev->subordinate, set_device_error_reporting, &enable);
}

/**
 * aer_enable_rootport - enable Root Port's interrupts when receiving messages
 * @rpc: pointer to a Root Port data structure
 *
 * Invoked when PCIe bus loads AER service driver.
 */
static void aer_enable_rootport(struct aer_rpc *rpc)
{
	struct pci_dev *pdev = rpc->rpd->port;
	int pos, aer_pos;
	u16 reg16;
	u32 reg32;

	pos = pci_pcie_cap(pdev);
	/* Clear PCIe Capability's Device Status */
	pci_read_config_word(pdev, pos+PCI_EXP_DEVSTA, &reg16);
	pci_write_config_word(pdev, pos+PCI_EXP_DEVSTA, reg16);

	/* Disable system error generation in response to error messages */
	pci_read_config_word(pdev, pos + PCI_EXP_RTCTL, &reg16);
	reg16 &= ~(SYSTEM_ERROR_INTR_ON_MESG_MASK);
	pci_write_config_word(pdev, pos + PCI_EXP_RTCTL, reg16);

	aer_pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
	/* Clear error status */
	pci_read_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, &reg32);
	pci_write_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, reg32);
	pci_read_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, &reg32);
	pci_write_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, reg32);
	pci_read_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, &reg32);
	pci_write_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, reg32);

	/*
	 * Enable error reporting for the root port device and downstream port
	 * devices.
	 */
	set_downstream_devices_error_reporting(pdev, true);

	/* Enable Root Port's interrupt in response to error messages */
	pci_read_config_dword(pdev, aer_pos + PCI_ERR_ROOT_COMMAND, &reg32);
	reg32 |= ROOT_PORT_INTR_ON_MESG_MASK;
	pci_write_config_dword(pdev, aer_pos + PCI_ERR_ROOT_COMMAND, reg32);
}

/**
 * aer_disable_rootport - disable Root Port's interrupts when receiving messages
 * @rpc: pointer to a Root Port data structure
 *
 * Invoked when PCIe bus unloads AER service driver.
 */
static void aer_disable_rootport(struct aer_rpc *rpc)
{
	struct pci_dev *pdev = rpc->rpd->port;
	u32 reg32;
	int pos;

	/*
	 * Disable error reporting for the root port device and downstream port
	 * devices.
	 */
	set_downstream_devices_error_reporting(pdev, false);

	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
	/* Disable Root's interrupt in response to error messages */
	pci_read_config_dword(pdev, pos + PCI_ERR_ROOT_COMMAND, &reg32);
	reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK;
	pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_COMMAND, reg32);

	/* Clear Root's error status reg */
	pci_read_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, &reg32);
	pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, reg32);
}

/**
 * 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 & (PCI_ERR_ROOT_UNCOR_RCV|PCI_ERR_ROOT_COR_RCV))) {
		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_ERR_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 */
	spin_lock_init(&rpc->e_lock);

	rpc->rpd = dev;
	INIT_WORK(&rpc->dpc_handler, aer_isr);
	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_disable_rootport(rpc);
		kfree(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)
{
	u32 reg32;
	int pos;

	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);

	/* Disable Root's interrupt in response to error messages */
	pci_read_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, &reg32);
	reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK;
	pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, reg32);

	aer_do_secondary_bus_reset(dev);
	dev_printk(KERN_DEBUG, &dev->dev, "Root Port link has been reset\n");

	/* Clear Root Error Status */
	pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &reg32);
	pci_write_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, reg32);

	/* Enable Root Port's interrupt in response to error messages */
	pci_read_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, &reg32);
	reg32 |= ROOT_PORT_INTR_ON_MESG_MASK;
	pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, reg32);

	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 (!pci_aer_available())
		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
f1a7bfaf RW	75	bool pci_aer_available(void)
	76	{
	77	return !pcie_aer_disable && pci_msi_enabled();
	78	}
	79
843f4697 HS	80	static int set_device_error_reporting(struct pci_dev dev, void data)
	81	{
	82	bool enable = ((bool )data);
	83
	84	if ((dev->pcie_type == PCI_EXP_TYPE_ROOT_PORT) \|\|
	85	(dev->pcie_type == PCI_EXP_TYPE_UPSTREAM) \|\|
	86	(dev->pcie_type == PCI_EXP_TYPE_DOWNSTREAM)) {
	87	if (enable)
	88	pci_enable_pcie_error_reporting(dev);
	89	else
	90	pci_disable_pcie_error_reporting(dev);
	91	}
	92
	93	if (enable)
	94	pcie_set_ecrc_checking(dev);
	95
	96	return 0;
	97	}
	98
	99	/**
	100	* set_downstream_devices_error_reporting - enable/disable the error reporting bits on the root port and its downstream ports.
	101	* @dev: pointer to root port's pci_dev data structure
	102	* @enable: true = enable error reporting, false = disable error reporting.
	103	*/
	104	static void set_downstream_devices_error_reporting(struct pci_dev *dev,
	105	bool enable)
	106	{
	107	set_device_error_reporting(dev, &enable);
	108
	109	if (!dev->subordinate)
	110	return;
	111	pci_walk_bus(dev->subordinate, set_device_error_reporting, &enable);
	112	}
	113
	114	/**
	115	* aer_enable_rootport - enable Root Port's interrupts when receiving messages
	116	* @rpc: pointer to a Root Port data structure
	117	*
	118	* Invoked when PCIe bus loads AER service driver.
	119	*/
	120	static void aer_enable_rootport(struct aer_rpc *rpc)
	121	{
	122	struct pci_dev *pdev = rpc->rpd->port;
	123	int pos, aer_pos;
	124	u16 reg16;
	125	u32 reg32;
	126
	127	pos = pci_pcie_cap(pdev);
	128	/* Clear PCIe Capability's Device Status */
	129	pci_read_config_word(pdev, pos+PCI_EXP_DEVSTA, &reg16);
	130	pci_write_config_word(pdev, pos+PCI_EXP_DEVSTA, reg16);
	131
	132	/* Disable system error generation in response to error messages */
	133	pci_read_config_word(pdev, pos + PCI_EXP_RTCTL, &reg16);
	134	reg16 &= ~(SYSTEM_ERROR_INTR_ON_MESG_MASK);
	135	pci_write_config_word(pdev, pos + PCI_EXP_RTCTL, reg16);
	136
	137	aer_pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
	138	/* Clear error status */
	139	pci_read_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, &reg32);
	140	pci_write_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, reg32);
	141	pci_read_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, &reg32);
	142	pci_write_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, reg32);
	143	pci_read_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, &reg32);
144	pci_write_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, reg32);
145
146	/*
147	* Enable error reporting for the root port device and downstream port
148	* devices.
149	*/
150	set_downstream_devices_error_reporting(pdev, true);
151
152	/* Enable Root Port's interrupt in response to error messages */
153	pci_read_config_dword(pdev, aer_pos + PCI_ERR_ROOT_COMMAND, &reg32);
154	reg32 \|= ROOT_PORT_INTR_ON_MESG_MASK;
155	pci_write_config_dword(pdev, aer_pos + PCI_ERR_ROOT_COMMAND, reg32);
156	}
157
158	/**
159	* aer_disable_rootport - disable Root Port's interrupts when receiving messages
160	* @rpc: pointer to a Root Port data structure
161	*
162	* Invoked when PCIe bus unloads AER service driver.
163	*/
164	static void aer_disable_rootport(struct aer_rpc *rpc)
165	{
166	struct pci_dev *pdev = rpc->rpd->port;
167	u32 reg32;
168	int pos;
169
170	/*
171	* Disable error reporting for the root port device and downstream port
172	* devices.
173	*/
174	set_downstream_devices_error_reporting(pdev, false);
175
176	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
177	/* Disable Root's interrupt in response to error messages */
178	pci_read_config_dword(pdev, pos + PCI_ERR_ROOT_COMMAND, &reg32);
179	reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK;
180	pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_COMMAND, reg32);
181
182	/* Clear Root's error status reg */
183	pci_read_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, &reg32);
184	pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, reg32);
185	}
186
6c2b374d ZY	187	/**
	188	* aer_irq - Root Port's ISR
	189	* @irq: IRQ assigned to Root Port
	190	* @context: pointer to Root Port data structure
6c2b374d ZY	191	*
6c2b374d ZY	192	* Invoked when Root Port detects AER messages.
f6d37800	193	*/
634deb02	194	irqreturn_t aer_irq(int irq, void *context)
6c2b374d ZY	195	{
	196	unsigned int status, id;
	197	struct pcie_device pdev = (struct pcie_device )context;
	198	struct aer_rpc *rpc = get_service_data(pdev);
	199	int next_prod_idx;
	200	unsigned long flags;
	201	int pos;
	202
0927678f	203	pos = pci_find_ext_capability(pdev->port, PCI_EXT_CAP_ID_ERR);
6c2b374d ZY	204	/*
	205	* Must lock access to Root Error Status Reg, Root Error ID Reg,
	206	* and Root error producer/consumer index
	207	*/
	208	spin_lock_irqsave(&rpc->e_lock, flags);
	209
	210	/* Read error status */
	211	pci_read_config_dword(pdev->port, pos + PCI_ERR_ROOT_STATUS, &status);
e167bfca	212	if (!(status & (PCI_ERR_ROOT_UNCOR_RCV\|PCI_ERR_ROOT_COR_RCV))) {
6c2b374d ZY	213	spin_unlock_irqrestore(&rpc->e_lock, flags);
	214	return IRQ_NONE;
	215	}
	216
	217	/* Read error source and clear error status */
f647a44f	218	pci_read_config_dword(pdev->port, pos + PCI_ERR_ROOT_ERR_SRC, &id);
6c2b374d ZY	219	pci_write_config_dword(pdev->port, pos + PCI_ERR_ROOT_STATUS, status);
	220
	221	/* Store error source for later DPC handler */
	222	next_prod_idx = rpc->prod_idx + 1;
	223	if (next_prod_idx == AER_ERROR_SOURCES_MAX)
	224	next_prod_idx = 0;
	225	if (next_prod_idx == rpc->cons_idx) {
	226	/*
	227	* Error Storm Condition - possibly the same error occurred.
	228	* Drop the error.
	229	*/
	230	spin_unlock_irqrestore(&rpc->e_lock, flags);
	231	return IRQ_HANDLED;
	232	}
	233	rpc->e_sources[rpc->prod_idx].status = status;
	234	rpc->e_sources[rpc->prod_idx].id = id;
	235	rpc->prod_idx = next_prod_idx;
	236	spin_unlock_irqrestore(&rpc->e_lock, flags);
	237
	238	/* Invoke DPC handler */
	239	schedule_work(&rpc->dpc_handler);
	240
	241	return IRQ_HANDLED;
	242	}
634deb02	243	EXPORT_SYMBOL_GPL(aer_irq);
6c2b374d ZY	244
	245	/**
	246	* aer_alloc_rpc - allocate Root Port data structure
	247	* @dev: pointer to the pcie_dev data structure
	248	*
	249	* Invoked when Root Port's AER service is loaded.
f6d37800	250	*/
c9a91883	251	static struct aer_rpc aer_alloc_rpc(struct pcie_device dev)
6c2b374d ZY	252	{
	253	struct aer_rpc *rpc;
	254
c9a91883 HS	255	rpc = kzalloc(sizeof(struct aer_rpc), GFP_KERNEL);
c9a91883 HS	256	if (!rpc)
6c2b374d ZY	257	return NULL;
6c2b374d ZY	258
f6d37800	259	/* Initialize Root lock access, e_lock, to Root Error Status Reg */
f5609d7e	260	spin_lock_init(&rpc->e_lock);
6c2b374d ZY	261
6c2b374d ZY	262	rpc->rpd = dev;
65f27f38	263	INIT_WORK(&rpc->dpc_handler, aer_isr);
6c2b374d ZY	264	mutex_init(&rpc->rpc_mutex);
	265	init_waitqueue_head(&rpc->wait_release);
	266
45e829ea	267	/* Use PCIe bus function to store rpc into PCIe device */
6c2b374d ZY	268	set_service_data(dev, rpc);
	269
	270	return rpc;
	271	}
	272
	273	/**
	274	* aer_remove - clean up resources
	275	* @dev: pointer to the pcie_dev data structure
	276	*
	277	* Invoked when PCI Express bus unloads or AER probe fails.
f6d37800	278	*/
6c2b374d ZY	279	static void aer_remove(struct pcie_device *dev)
	280	{
	281	struct aer_rpc *rpc = get_service_data(dev);
	282
	283	if (rpc) {
	284	/* If register interrupt service, it must be free. */
	285	if (rpc->isr)
	286	free_irq(dev->irq, dev);
	287
	288	wait_event(rpc->wait_release, rpc->prod_idx == rpc->cons_idx);
	289
460d298d HS	290	aer_disable_rootport(rpc);
460d298d HS	291	kfree(rpc);
6c2b374d ZY	292	set_service_data(dev, NULL);
	293	}
	294	}
	295
	296	/**
	297	* aer_probe - initialize resources
	298	* @dev: pointer to the pcie_dev data structure
	299	* @id: pointer to the service id data structure
	300	*
	301	* Invoked when PCI Express bus loads AER service driver.
f6d37800	302	*/
c9a91883	303	static int __devinit aer_probe(struct pcie_device *dev)
6c2b374d ZY	304	{
	305	int status;
	306	struct aer_rpc *rpc;
	307	struct device *device = &dev->device;
	308
	309	/* Init */
c9a91883 HS	310	status = aer_init(dev);
c9a91883 HS	311	if (status)
6c2b374d ZY	312	return status;
	313
	314	/* Alloc rpc data structure */
c9a91883 HS	315	rpc = aer_alloc_rpc(dev);
c9a91883 HS	316	if (!rpc) {
531f254e	317	dev_printk(KERN_DEBUG, device, "alloc rpc failed\n");
6c2b374d ZY	318	aer_remove(dev);
	319	return -ENOMEM;
	320	}
	321
	322	/* Request IRQ ISR */
c9a91883 HS	323	status = request_irq(dev->irq, aer_irq, IRQF_SHARED, "aerdrv", dev);
c9a91883 HS	324	if (status) {
531f254e	325	dev_printk(KERN_DEBUG, device, "request IRQ failed\n");
6c2b374d ZY	326	aer_remove(dev);
	327	return status;
	328	}
	329
	330	rpc->isr = 1;
	331
	332	aer_enable_rootport(rpc);
	333
	334	return status;
	335	}
	336
	337	/**
	338	* aer_root_reset - reset link on Root Port
	339	* @dev: pointer to Root Port's pci_dev data structure
	340	*
	341	* Invoked by Port Bus driver when performing link reset at Root Port.
f6d37800	342	*/
6c2b374d ZY	343	static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
6c2b374d ZY	344	{
c6d34edd	345	u32 reg32;
6c2b374d ZY	346	int pos;
6c2b374d ZY	347
0927678f	348	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
6c2b374d ZY	349
6c2b374d ZY	350	/* Disable Root's interrupt in response to error messages */
c6d34edd HS	351	pci_read_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, &reg32);
	352	reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK;
	353	pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, reg32);
6c2b374d	354
89713422	355	aer_do_secondary_bus_reset(dev);
531f254e	356	dev_printk(KERN_DEBUG, &dev->dev, "Root Port link has been reset\n");
6c2b374d	357
c6d34edd HS	358	/* Clear Root Error Status */
	359	pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &reg32);
	360	pci_write_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, reg32);
	361
6c2b374d	362	/* Enable Root Port's interrupt in response to error messages */
c6d34edd HS	363	pci_read_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, &reg32);
	364	reg32 \|= ROOT_PORT_INTR_ON_MESG_MASK;
	365	pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, reg32);
6c2b374d ZY	366
	367	return PCI_ERS_RESULT_RECOVERED;
	368	}
	369
	370	/**
	371	* aer_error_detected - update severity status
	372	* @dev: pointer to Root Port's pci_dev data structure
	373	* @error: error severity being notified by port bus
	374	*
	375	* Invoked by Port Bus driver during error recovery.
f6d37800	376	*/
6c2b374d ZY	377	static pci_ers_result_t aer_error_detected(struct pci_dev *dev,
	378	enum pci_channel_state error)
	379	{
	380	/* Root Port has no impact. Always recovers. */
	381	return PCI_ERS_RESULT_CAN_RECOVER;
	382	}
	383
	384	/**
	385	* aer_error_resume - clean up corresponding error status bits
	386	* @dev: pointer to Root Port's pci_dev data structure
	387	*
	388	* Invoked by Port Bus driver during nonfatal recovery.
f6d37800	389	*/
6c2b374d ZY	390	static void aer_error_resume(struct pci_dev *dev)
	391	{
	392	int pos;
	393	u32 status, mask;
	394	u16 reg16;
	395
	396	/* Clean up Root device status */
39a53062	397	pos = pci_pcie_cap(dev);
6c2b374d ZY	398	pci_read_config_word(dev, pos + PCI_EXP_DEVSTA, &reg16);
	399	pci_write_config_word(dev, pos + PCI_EXP_DEVSTA, reg16);
	400
	401	/* Clean AER Root Error Status */
0927678f	402	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
6c2b374d ZY	403	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
	404	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &mask);
	405	if (dev->error_state == pci_channel_io_normal)
	406	status &= ~mask; /* Clear corresponding nonfatal bits */
	407	else
	408	status &= mask; /* Clear corresponding fatal bits */
	409	pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
	410	}
	411
	412	/**
	413	* aer_service_init - register AER root service driver
	414	*
	415	* Invoked when AER root service driver is loaded.
f6d37800	416	*/
6c2b374d ZY	417	static int __init aer_service_init(void)
6c2b374d ZY	418	{
f1a7bfaf	419	if (!pci_aer_available())
3e77a3f7	420	return -ENXIO;
c1996c27	421	return pcie_port_service_register(&aerdriver);
6c2b374d ZY	422	}
	423
	424	/**
	425	* aer_service_exit - unregister AER root service driver
	426	*
	427	* Invoked when AER root service driver is unloaded.
f6d37800	428	*/
6c2b374d ZY	429	static void __exit aer_service_exit(void)
6c2b374d ZY	430	{
c1996c27	431	pcie_port_service_unregister(&aerdriver);
6c2b374d ZY	432	}
	433
	434	module_init(aer_service_init);
	435	module_exit(aer_service_exit);