[deliverable/linux.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/pci.h>
#include <linux/pci-acpi.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"

static int 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 const 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);
	int type = pci_pcie_type(dev);

	if ((type == PCI_EXP_TYPE_ROOT_PORT) ||
	    (type == PCI_EXP_TYPE_UPSTREAM) ||
	    (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 aer_pos;
	u16 reg16;
	u32 reg32;

	/* Clear PCIe Capability's Device Status */
	pcie_capability_read_word(pdev, PCI_EXP_DEVSTA, &reg16);
	pcie_capability_write_word(pdev, PCI_EXP_DEVSTA, reg16);

	/* Disable system error generation in response to error messages */
	pcie_capability_clear_word(pdev, PCI_EXP_RTCTL,
				   SYSTEM_ERROR_INTR_ON_MESG_MASK);

	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);

	/* 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);

		flush_work(&rpc->dpc_handler);
		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 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);

	pci_reset_bridge_secondary_bus(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 */
	pcie_capability_read_word(dev, PCI_EXP_DEVSTA, &reg16);
	pcie_capability_write_word(dev, 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() || aer_acpi_firmware_first())
		return -ENXIO;
	return pcie_port_service_register(&aerdriver);
}
device_initcall(aer_service_init);
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
6c2b374d	18	#include <linux/pci.h>
415e12b2	19	#include <linux/pci-acpi.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"
6c2b374d	39
15856ad5	40	static int aer_probe(struct pcie_device *dev);
6c2b374d	41	static void aer_remove(struct pcie_device *dev);
6c2b374d ZY	42	static pci_ers_result_t aer_error_detected(struct pci_dev *dev,
	43	enum pci_channel_state error);
	44	static void aer_error_resume(struct pci_dev *dev);
	45	static pci_ers_result_t aer_root_reset(struct pci_dev *dev);
	46
49453028	47	static const struct pci_error_handlers aer_error_handlers = {
6c2b374d	48	.error_detected = aer_error_detected,
c9a91883	49	.resume = aer_error_resume,
6c2b374d ZY	50	};
6c2b374d ZY	51
c1996c27	52	static struct pcie_port_service_driver aerdriver = {
6c2b374d	53	.name = "aer",
694f88ef	54	.port_type = PCI_EXP_TYPE_ROOT_PORT,
22106368	55	.service = PCIE_PORT_SERVICE_AER,
6c2b374d ZY	56
	57	.probe = aer_probe,
	58	.remove = aer_remove,
	59
6c2b374d ZY	60	.err_handler = &aer_error_handlers,
	61
	62	.reset_link = aer_root_reset,
	63	};
	64
7f785763 RD	65	static int pcie_aer_disable;
	66
	67	void pci_no_aer(void)
	68	{
	69	pcie_aer_disable = 1; /* has priority over 'forceload' */
	70	}
	71
f1a7bfaf RW	72	bool pci_aer_available(void)
	73	{
	74	return !pcie_aer_disable && pci_msi_enabled();
	75	}
	76
843f4697 HS	77	static int set_device_error_reporting(struct pci_dev dev, void data)
	78	{
	79	bool enable = ((bool )data);
62f87c0e	80	int type = pci_pcie_type(dev);
843f4697	81
62f87c0e YW	82	if ((type == PCI_EXP_TYPE_ROOT_PORT) \|\|
	83	(type == PCI_EXP_TYPE_UPSTREAM) \|\|
	84	(type == PCI_EXP_TYPE_DOWNSTREAM)) {
843f4697 HS	85	if (enable)
	86	pci_enable_pcie_error_reporting(dev);
	87	else
	88	pci_disable_pcie_error_reporting(dev);
	89	}
	90
	91	if (enable)
	92	pcie_set_ecrc_checking(dev);
	93
	94	return 0;
	95	}
	96
	97	/**
	98	* set_downstream_devices_error_reporting - enable/disable the error reporting bits on the root port and its downstream ports.
	99	* @dev: pointer to root port's pci_dev data structure
	100	* @enable: true = enable error reporting, false = disable error reporting.
	101	*/
	102	static void set_downstream_devices_error_reporting(struct pci_dev *dev,
	103	bool enable)
	104	{
	105	set_device_error_reporting(dev, &enable);
	106
	107	if (!dev->subordinate)
	108	return;
	109	pci_walk_bus(dev->subordinate, set_device_error_reporting, &enable);
	110	}
	111
	112	/**
	113	* aer_enable_rootport - enable Root Port's interrupts when receiving messages
	114	* @rpc: pointer to a Root Port data structure
	115	*
	116	* Invoked when PCIe bus loads AER service driver.
	117	*/
	118	static void aer_enable_rootport(struct aer_rpc *rpc)
	119	{
	120	struct pci_dev *pdev = rpc->rpd->port;
43bd4ee8	121	int aer_pos;
843f4697 HS	122	u16 reg16;
	123	u32 reg32;
	124
843f4697	125	/* Clear PCIe Capability's Device Status */
43bd4ee8 JL	126	pcie_capability_read_word(pdev, PCI_EXP_DEVSTA, &reg16);
43bd4ee8 JL	127	pcie_capability_write_word(pdev, PCI_EXP_DEVSTA, reg16);
843f4697 HS	128
843f4697 HS	129	/* Disable system error generation in response to error messages */
43bd4ee8 JL	130	pcie_capability_clear_word(pdev, PCI_EXP_RTCTL,
43bd4ee8 JL	131	SYSTEM_ERROR_INTR_ON_MESG_MASK);
843f4697 HS	132
	133	aer_pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
	134	/* Clear error status */
	135	pci_read_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, &reg32);
	136	pci_write_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, reg32);
	137	pci_read_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, &reg32);
	138	pci_write_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, reg32);
	139	pci_read_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, &reg32);
	140	pci_write_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, reg32);
	141
	142	/*
	143	* Enable error reporting for the root port device and downstream port
	144	* devices.
	145	*/
	146	set_downstream_devices_error_reporting(pdev, true);
	147
	148	/* Enable Root Port's interrupt in response to error messages */
	149	pci_read_config_dword(pdev, aer_pos + PCI_ERR_ROOT_COMMAND, &reg32);
	150	reg32 \|= ROOT_PORT_INTR_ON_MESG_MASK;
	151	pci_write_config_dword(pdev, aer_pos + PCI_ERR_ROOT_COMMAND, reg32);
	152	}
	153
	154	/**
	155	* aer_disable_rootport - disable Root Port's interrupts when receiving messages
	156	* @rpc: pointer to a Root Port data structure
	157	*
	158	* Invoked when PCIe bus unloads AER service driver.
	159	*/
	160	static void aer_disable_rootport(struct aer_rpc *rpc)
	161	{
	162	struct pci_dev *pdev = rpc->rpd->port;
	163	u32 reg32;
	164	int pos;
	165
	166	/*
	167	* Disable error reporting for the root port device and downstream port
	168	* devices.
	169	*/
	170	set_downstream_devices_error_reporting(pdev, false);
	171
	172	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
	173	/* Disable Root's interrupt in response to error messages */
	174	pci_read_config_dword(pdev, pos + PCI_ERR_ROOT_COMMAND, &reg32);
	175	reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK;
	176	pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_COMMAND, reg32);
	177
	178	/* Clear Root's error status reg */
	179	pci_read_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, &reg32);
	180	pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, reg32);
	181	}
	182
6c2b374d ZY	183	/**
	184	* aer_irq - Root Port's ISR
	185	* @irq: IRQ assigned to Root Port
	186	* @context: pointer to Root Port data structure
6c2b374d ZY	187	*
6c2b374d ZY	188	* Invoked when Root Port detects AER messages.
f6d37800	189	*/
634deb02	190	irqreturn_t aer_irq(int irq, void *context)
6c2b374d ZY	191	{
	192	unsigned int status, id;
	193	struct pcie_device pdev = (struct pcie_device )context;
	194	struct aer_rpc *rpc = get_service_data(pdev);
	195	int next_prod_idx;
	196	unsigned long flags;
	197	int pos;
	198
0927678f	199	pos = pci_find_ext_capability(pdev->port, PCI_EXT_CAP_ID_ERR);
6c2b374d ZY	200	/*
	201	* Must lock access to Root Error Status Reg, Root Error ID Reg,
	202	* and Root error producer/consumer index
	203	*/
	204	spin_lock_irqsave(&rpc->e_lock, flags);
	205
	206	/* Read error status */
	207	pci_read_config_dword(pdev->port, pos + PCI_ERR_ROOT_STATUS, &status);
e167bfca	208	if (!(status & (PCI_ERR_ROOT_UNCOR_RCV\|PCI_ERR_ROOT_COR_RCV))) {
6c2b374d ZY	209	spin_unlock_irqrestore(&rpc->e_lock, flags);
	210	return IRQ_NONE;
	211	}
	212
	213	/* Read error source and clear error status */
f647a44f	214	pci_read_config_dword(pdev->port, pos + PCI_ERR_ROOT_ERR_SRC, &id);
6c2b374d ZY	215	pci_write_config_dword(pdev->port, pos + PCI_ERR_ROOT_STATUS, status);
	216
	217	/* Store error source for later DPC handler */
	218	next_prod_idx = rpc->prod_idx + 1;
	219	if (next_prod_idx == AER_ERROR_SOURCES_MAX)
	220	next_prod_idx = 0;
	221	if (next_prod_idx == rpc->cons_idx) {
	222	/*
	223	* Error Storm Condition - possibly the same error occurred.
	224	* Drop the error.
	225	*/
	226	spin_unlock_irqrestore(&rpc->e_lock, flags);
	227	return IRQ_HANDLED;
	228	}
	229	rpc->e_sources[rpc->prod_idx].status = status;
	230	rpc->e_sources[rpc->prod_idx].id = id;
	231	rpc->prod_idx = next_prod_idx;
	232	spin_unlock_irqrestore(&rpc->e_lock, flags);
	233
	234	/* Invoke DPC handler */
	235	schedule_work(&rpc->dpc_handler);
	236
	237	return IRQ_HANDLED;
	238	}
634deb02	239	EXPORT_SYMBOL_GPL(aer_irq);
6c2b374d ZY	240
	241	/**
	242	* aer_alloc_rpc - allocate Root Port data structure
	243	* @dev: pointer to the pcie_dev data structure
	244	*
	245	* Invoked when Root Port's AER service is loaded.
f6d37800	246	*/
c9a91883	247	static struct aer_rpc aer_alloc_rpc(struct pcie_device dev)
6c2b374d ZY	248	{
	249	struct aer_rpc *rpc;
	250
c9a91883 HS	251	rpc = kzalloc(sizeof(struct aer_rpc), GFP_KERNEL);
c9a91883 HS	252	if (!rpc)
6c2b374d ZY	253	return NULL;
6c2b374d ZY	254
f6d37800	255	/* Initialize Root lock access, e_lock, to Root Error Status Reg */
f5609d7e	256	spin_lock_init(&rpc->e_lock);
6c2b374d ZY	257
6c2b374d ZY	258	rpc->rpd = dev;
65f27f38	259	INIT_WORK(&rpc->dpc_handler, aer_isr);
6c2b374d	260	mutex_init(&rpc->rpc_mutex);
6c2b374d	261
45e829ea	262	/* Use PCIe bus function to store rpc into PCIe device */
6c2b374d ZY	263	set_service_data(dev, rpc);
	264
	265	return rpc;
	266	}
	267
	268	/**
	269	* aer_remove - clean up resources
	270	* @dev: pointer to the pcie_dev data structure
	271	*
	272	* Invoked when PCI Express bus unloads or AER probe fails.
f6d37800	273	*/
6c2b374d ZY	274	static void aer_remove(struct pcie_device *dev)
	275	{
	276	struct aer_rpc *rpc = get_service_data(dev);
	277
	278	if (rpc) {
	279	/* If register interrupt service, it must be free. */
	280	if (rpc->isr)
	281	free_irq(dev->irq, dev);
	282
4ae2182b	283	flush_work(&rpc->dpc_handler);
460d298d HS	284	aer_disable_rootport(rpc);
460d298d HS	285	kfree(rpc);
6c2b374d ZY	286	set_service_data(dev, NULL);
	287	}
	288	}
	289
	290	/**
	291	* aer_probe - initialize resources
	292	* @dev: pointer to the pcie_dev data structure
	293	* @id: pointer to the service id data structure
	294	*
	295	* Invoked when PCI Express bus loads AER service driver.
f6d37800	296	*/
15856ad5	297	static int aer_probe(struct pcie_device *dev)
6c2b374d ZY	298	{
	299	int status;
	300	struct aer_rpc *rpc;
	301	struct device *device = &dev->device;
	302
	303	/* Init */
c9a91883 HS	304	status = aer_init(dev);
c9a91883 HS	305	if (status)
6c2b374d ZY	306	return status;
	307
	308	/* Alloc rpc data structure */
c9a91883 HS	309	rpc = aer_alloc_rpc(dev);
c9a91883 HS	310	if (!rpc) {
531f254e	311	dev_printk(KERN_DEBUG, device, "alloc rpc failed\n");
6c2b374d ZY	312	aer_remove(dev);
	313	return -ENOMEM;
	314	}
	315
	316	/* Request IRQ ISR */
c9a91883 HS	317	status = request_irq(dev->irq, aer_irq, IRQF_SHARED, "aerdrv", dev);
c9a91883 HS	318	if (status) {
531f254e	319	dev_printk(KERN_DEBUG, device, "request IRQ failed\n");
6c2b374d ZY	320	aer_remove(dev);
	321	return status;
	322	}
	323
	324	rpc->isr = 1;
	325
	326	aer_enable_rootport(rpc);
	327
	328	return status;
	329	}
	330
	331	/**
	332	* aer_root_reset - reset link on Root Port
	333	* @dev: pointer to Root Port's pci_dev data structure
	334	*
	335	* Invoked by Port Bus driver when performing link reset at Root Port.
f6d37800	336	*/
6c2b374d ZY	337	static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
6c2b374d ZY	338	{
c6d34edd	339	u32 reg32;
6c2b374d ZY	340	int pos;
6c2b374d ZY	341
0927678f	342	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
6c2b374d ZY	343
6c2b374d ZY	344	/* Disable Root's interrupt in response to error messages */
c6d34edd HS	345	pci_read_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, &reg32);
	346	reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK;
	347	pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, reg32);
6c2b374d	348
1b95ce8f	349	pci_reset_bridge_secondary_bus(dev);
531f254e	350	dev_printk(KERN_DEBUG, &dev->dev, "Root Port link has been reset\n");
6c2b374d	351
c6d34edd HS	352	/* Clear Root Error Status */
	353	pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &reg32);
	354	pci_write_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, reg32);
	355
6c2b374d	356	/* Enable Root Port's interrupt in response to error messages */
c6d34edd HS	357	pci_read_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, &reg32);
	358	reg32 \|= ROOT_PORT_INTR_ON_MESG_MASK;
	359	pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, reg32);
6c2b374d ZY	360
	361	return PCI_ERS_RESULT_RECOVERED;
	362	}
	363
	364	/**
	365	* aer_error_detected - update severity status
	366	* @dev: pointer to Root Port's pci_dev data structure
	367	* @error: error severity being notified by port bus
	368	*
	369	* Invoked by Port Bus driver during error recovery.
f6d37800	370	*/
6c2b374d ZY	371	static pci_ers_result_t aer_error_detected(struct pci_dev *dev,
	372	enum pci_channel_state error)
	373	{
	374	/* Root Port has no impact. Always recovers. */
	375	return PCI_ERS_RESULT_CAN_RECOVER;
	376	}
	377
	378	/**
	379	* aer_error_resume - clean up corresponding error status bits
	380	* @dev: pointer to Root Port's pci_dev data structure
	381	*
	382	* Invoked by Port Bus driver during nonfatal recovery.
f6d37800	383	*/
6c2b374d ZY	384	static void aer_error_resume(struct pci_dev *dev)
	385	{
	386	int pos;
	387	u32 status, mask;
	388	u16 reg16;
	389
	390	/* Clean up Root device status */
43bd4ee8 JL	391	pcie_capability_read_word(dev, PCI_EXP_DEVSTA, &reg16);
43bd4ee8 JL	392	pcie_capability_write_word(dev, PCI_EXP_DEVSTA, reg16);
6c2b374d ZY	393
6c2b374d ZY	394	/* Clean AER Root Error Status */
0927678f	395	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
6c2b374d ZY	396	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
	397	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &mask);
	398	if (dev->error_state == pci_channel_io_normal)
	399	status &= ~mask; /* Clear corresponding nonfatal bits */
	400	else
	401	status &= mask; /* Clear corresponding fatal bits */
	402	pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
	403	}
	404
	405	/**
	406	* aer_service_init - register AER root service driver
	407	*
	408	* Invoked when AER root service driver is loaded.
f6d37800	409	*/
6c2b374d ZY	410	static int __init aer_service_init(void)
6c2b374d ZY	411	{
b22c3d82	412	if (!pci_aer_available() \|\| aer_acpi_firmware_first())
3e77a3f7	413	return -ENXIO;
c1996c27	414	return pcie_port_service_register(&aerdriver);
6c2b374d	415	}
8756336c	416	device_initcall(aer_service_init);