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Subject: [PATCH v1 03/13] PCI/AER: Squash aerdrv_core.c into aerdrv.c
From:   Bjorn Helgaas <helgaas@kernel.org>
To:     linux-pci@vger.kernel.org
Cc:     Keith Busch <keith.busch@intel.com>,
        Borislav Petkov <bp@alien8.de>,
        Oza Pawandeep <poza@codeaurora.org>,
        linux-kernel@vger.kernel.org
Date:   Fri, 08 Jun 2018 15:05:04 -0500
Message-ID: <152848830414.11888.9793521055800870273.stgit@bhelgaas-glaptop.roam.corp.google.com>
In-Reply-To: <152848785553.11888.12243539903985770441.stgit@bhelgaas-glaptop.roam.corp.google.com>
References: <152848785553.11888.12243539903985770441.stgit@bhelgaas-glaptop.roam.corp.google.com>
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From: Bjorn Helgaas <bhelgaas@google.com>

Squash aerdrv_core.c into aerdrv.c.  No functional change intended.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
 drivers/pci/pcie/aer/Makefile      |    2 
 drivers/pci/pcie/aer/aerdrv.c      |  474 ++++++++++++++++++++++++++++++++++
 drivers/pci/pcie/aer/aerdrv.h      |    1 
 drivers/pci/pcie/aer/aerdrv_core.c |  496 ------------------------------------
 4 files changed, 475 insertions(+), 498 deletions(-)
 delete mode 100644 drivers/pci/pcie/aer/aerdrv_core.c

diff --git a/drivers/pci/pcie/aer/Makefile b/drivers/pci/pcie/aer/Makefile
index 09bd890875a3..c85bd0851903 100644
--- a/drivers/pci/pcie/aer/Makefile
+++ b/drivers/pci/pcie/aer/Makefile
@@ -7,7 +7,7 @@ obj-$(CONFIG_PCIEAER) += aerdriver.o
 
 obj-$(CONFIG_PCIE_ECRC)	+= ecrc.o
 
-aerdriver-objs := aerdrv_errprint.o aerdrv_core.o aerdrv.o
+aerdriver-objs := aerdrv_errprint.o aerdrv.o
 aerdriver-$(CONFIG_ACPI) += aerdrv_acpi.o
 
 obj-$(CONFIG_PCIEAER_INJECT) += aer_inject.o
diff --git a/drivers/pci/pcie/aer/aerdrv.c b/drivers/pci/pcie/aer/aerdrv.c
index 8d3bc28821ba..c185069ef880 100644
--- a/drivers/pci/pcie/aer/aerdrv.c
+++ b/drivers/pci/pcie/aer/aerdrv.c
@@ -18,6 +18,7 @@
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/delay.h>
+#include <linux/kfifo.h>
 #include <linux/slab.h>
 
 #include "aerdrv.h"
@@ -35,6 +36,479 @@ bool pci_aer_available(void)
 	return !pcie_aer_disable && pci_msi_enabled();
 }
 
+#define	PCI_EXP_AER_FLAGS	(PCI_EXP_DEVCTL_CERE | PCI_EXP_DEVCTL_NFERE | \
+				 PCI_EXP_DEVCTL_FERE | PCI_EXP_DEVCTL_URRE)
+
+int pci_enable_pcie_error_reporting(struct pci_dev *dev)
+{
+	if (pcie_aer_get_firmware_first(dev))
+		return -EIO;
+
+	if (!dev->aer_cap)
+		return -EIO;
+
+	return pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_AER_FLAGS);
+}
+EXPORT_SYMBOL_GPL(pci_enable_pcie_error_reporting);
+
+int pci_disable_pcie_error_reporting(struct pci_dev *dev)
+{
+	if (pcie_aer_get_firmware_first(dev))
+		return -EIO;
+
+	return pcie_capability_clear_word(dev, PCI_EXP_DEVCTL,
+					  PCI_EXP_AER_FLAGS);
+}
+EXPORT_SYMBOL_GPL(pci_disable_pcie_error_reporting);
+
+int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev)
+{
+	int pos;
+	u32 status;
+
+	pos = dev->aer_cap;
+	if (!pos)
+		return -EIO;
+
+	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
+	if (status)
+		pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pci_cleanup_aer_uncorrect_error_status);
+
+int pci_cleanup_aer_error_status_regs(struct pci_dev *dev)
+{
+	int pos;
+	u32 status;
+	int port_type;
+
+	if (!pci_is_pcie(dev))
+		return -ENODEV;
+
+	pos = dev->aer_cap;
+	if (!pos)
+		return -EIO;
+
+	port_type = pci_pcie_type(dev);
+	if (port_type == PCI_EXP_TYPE_ROOT_PORT) {
+		pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &status);
+		pci_write_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, status);
+	}
+
+	pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status);
+	pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, status);
+
+	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
+	pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
+
+	return 0;
+}
+
+int pci_aer_init(struct pci_dev *dev)
+{
+	dev->aer_cap = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
+	return pci_cleanup_aer_error_status_regs(dev);
+}
+
+/**
+ * add_error_device - list device to be handled
+ * @e_info: pointer to error info
+ * @dev: pointer to pci_dev to be added
+ */
+static int add_error_device(struct aer_err_info *e_info, struct pci_dev *dev)
+{
+	if (e_info->error_dev_num < AER_MAX_MULTI_ERR_DEVICES) {
+		e_info->dev[e_info->error_dev_num] = dev;
+		e_info->error_dev_num++;
+		return 0;
+	}
+	return -ENOSPC;
+}
+
+/**
+ * is_error_source - check whether the device is source of reported error
+ * @dev: pointer to pci_dev to be checked
+ * @e_info: pointer to reported error info
+ */
+static bool is_error_source(struct pci_dev *dev, struct aer_err_info *e_info)
+{
+	int pos;
+	u32 status, mask;
+	u16 reg16;
+
+	/*
+	 * When bus id is equal to 0, it might be a bad id
+	 * reported by root port.
+	 */
+	if ((PCI_BUS_NUM(e_info->id) != 0) &&
+	    !(dev->bus->bus_flags & PCI_BUS_FLAGS_NO_AERSID)) {
+		/* Device ID match? */
+		if (e_info->id == ((dev->bus->number << 8) | dev->devfn))
+			return true;
+
+		/* Continue id comparing if there is no multiple error */
+		if (!e_info->multi_error_valid)
+			return false;
+	}
+
+	/*
+	 * When either
+	 *      1) bus id is equal to 0. Some ports might lose the bus
+	 *              id of error source id;
+	 *      2) bus flag PCI_BUS_FLAGS_NO_AERSID is set
+	 *      3) There are multiple errors and prior ID comparing fails;
+	 * We check AER status registers to find possible reporter.
+	 */
+	if (atomic_read(&dev->enable_cnt) == 0)
+		return false;
+
+	/* Check if AER is enabled */
+	pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &reg16);
+	if (!(reg16 & PCI_EXP_AER_FLAGS))
+		return false;
+
+	pos = dev->aer_cap;
+	if (!pos)
+		return false;
+
+	/* Check if error is recorded */
+	if (e_info->severity == AER_CORRECTABLE) {
+		pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status);
+		pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, &mask);
+	} else {
+		pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
+		pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, &mask);
+	}
+	if (status & ~mask)
+		return true;
+
+	return false;
+}
+
+static int find_device_iter(struct pci_dev *dev, void *data)
+{
+	struct aer_err_info *e_info = (struct aer_err_info *)data;
+
+	if (is_error_source(dev, e_info)) {
+		/* List this device */
+		if (add_error_device(e_info, dev)) {
+			/* We cannot handle more... Stop iteration */
+			/* TODO: Should print error message here? */
+			return 1;
+		}
+
+		/* If there is only a single error, stop iteration */
+		if (!e_info->multi_error_valid)
+			return 1;
+	}
+	return 0;
+}
+
+/**
+ * find_source_device - search through device hierarchy for source device
+ * @parent: pointer to Root Port pci_dev data structure
+ * @e_info: including detailed error information such like id
+ *
+ * Return true if found.
+ *
+ * Invoked by DPC when error is detected at the Root Port.
+ * Caller of this function must set id, severity, and multi_error_valid of
+ * struct aer_err_info pointed by @e_info properly.  This function must fill
+ * e_info->error_dev_num and e_info->dev[], based on the given information.
+ */
+static bool find_source_device(struct pci_dev *parent,
+		struct aer_err_info *e_info)
+{
+	struct pci_dev *dev = parent;
+	int result;
+
+	/* Must reset in this function */
+	e_info->error_dev_num = 0;
+
+	/* Is Root Port an agent that sends error message? */
+	result = find_device_iter(dev, e_info);
+	if (result)
+		return true;
+
+	pci_walk_bus(parent->subordinate, find_device_iter, e_info);
+
+	if (!e_info->error_dev_num) {
+		pci_printk(KERN_DEBUG, parent, "can't find device of ID%04x\n",
+			   e_info->id);
+		return false;
+	}
+	return true;
+}
+
+/**
+ * handle_error_source - handle logging error into an event log
+ * @dev: pointer to pci_dev data structure of error source device
+ * @info: comprehensive error information
+ *
+ * Invoked when an error being detected by Root Port.
+ */
+static void handle_error_source(struct pci_dev *dev, struct aer_err_info *info)
+{
+	int pos;
+
+	if (info->severity == AER_CORRECTABLE) {
+		/*
+		 * Correctable error does not need software intervention.
+		 * No need to go through error recovery process.
+		 */
+		pos = dev->aer_cap;
+		if (pos)
+			pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS,
+					info->status);
+	} else if (info->severity == AER_NONFATAL)
+		pcie_do_nonfatal_recovery(dev);
+	else if (info->severity == AER_FATAL)
+		pcie_do_fatal_recovery(dev, PCIE_PORT_SERVICE_AER);
+}
+
+#ifdef CONFIG_ACPI_APEI_PCIEAER
+
+#define AER_RECOVER_RING_ORDER		4
+#define AER_RECOVER_RING_SIZE		(1 << AER_RECOVER_RING_ORDER)
+
+struct aer_recover_entry {
+	u8	bus;
+	u8	devfn;
+	u16	domain;
+	int	severity;
+	struct aer_capability_regs *regs;
+};
+
+static DEFINE_KFIFO(aer_recover_ring, struct aer_recover_entry,
+		    AER_RECOVER_RING_SIZE);
+
+static void aer_recover_work_func(struct work_struct *work)
+{
+	struct aer_recover_entry entry;
+	struct pci_dev *pdev;
+
+	while (kfifo_get(&aer_recover_ring, &entry)) {
+		pdev = pci_get_domain_bus_and_slot(entry.domain, entry.bus,
+						   entry.devfn);
+		if (!pdev) {
+			pr_err("AER recover: Can not find pci_dev for %04x:%02x:%02x:%x\n",
+			       entry.domain, entry.bus,
+			       PCI_SLOT(entry.devfn), PCI_FUNC(entry.devfn));
+			continue;
+		}
+		cper_print_aer(pdev, entry.severity, entry.regs);
+		if (entry.severity == AER_NONFATAL)
+			pcie_do_nonfatal_recovery(pdev);
+		else if (entry.severity == AER_FATAL)
+			pcie_do_fatal_recovery(pdev, PCIE_PORT_SERVICE_AER);
+		pci_dev_put(pdev);
+	}
+}
+
+/*
+ * Mutual exclusion for writers of aer_recover_ring, reader side don't
+ * need lock, because there is only one reader and lock is not needed
+ * between reader and writer.
+ */
+static DEFINE_SPINLOCK(aer_recover_ring_lock);
+static DECLARE_WORK(aer_recover_work, aer_recover_work_func);
+
+void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn,
+		       int severity, struct aer_capability_regs *aer_regs)
+{
+	unsigned long flags;
+	struct aer_recover_entry entry = {
+		.bus		= bus,
+		.devfn		= devfn,
+		.domain		= domain,
+		.severity	= severity,
+		.regs		= aer_regs,
+	};
+
+	spin_lock_irqsave(&aer_recover_ring_lock, flags);
+	if (kfifo_put(&aer_recover_ring, entry))
+		schedule_work(&aer_recover_work);
+	else
+		pr_err("AER recover: Buffer overflow when recovering AER for %04x:%02x:%02x:%x\n",
+		       domain, bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
+	spin_unlock_irqrestore(&aer_recover_ring_lock, flags);
+}
+EXPORT_SYMBOL_GPL(aer_recover_queue);
+#endif
+
+/**
+ * get_device_error_info - read error status from dev and store it to info
+ * @dev: pointer to the device expected to have a error record
+ * @info: pointer to structure to store the error record
+ *
+ * Return 1 on success, 0 on error.
+ *
+ * Note that @info is reused among all error devices. Clear fields properly.
+ */
+static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info)
+{
+	int pos, temp;
+
+	/* Must reset in this function */
+	info->status = 0;
+	info->tlp_header_valid = 0;
+
+	pos = dev->aer_cap;
+
+	/* The device might not support AER */
+	if (!pos)
+		return 0;
+
+	if (info->severity == AER_CORRECTABLE) {
+		pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS,
+			&info->status);
+		pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK,
+			&info->mask);
+		if (!(info->status & ~info->mask))
+			return 0;
+	} else if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
+		info->severity == AER_NONFATAL) {
+
+		/* Link is still healthy for IO reads */
+		pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
+			&info->status);
+		pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK,
+			&info->mask);
+		if (!(info->status & ~info->mask))
+			return 0;
+
+		/* Get First Error Pointer */
+		pci_read_config_dword(dev, pos + PCI_ERR_CAP, &temp);
+		info->first_error = PCI_ERR_CAP_FEP(temp);
+
+		if (info->status & AER_LOG_TLP_MASKS) {
+			info->tlp_header_valid = 1;
+			pci_read_config_dword(dev,
+				pos + PCI_ERR_HEADER_LOG, &info->tlp.dw0);
+			pci_read_config_dword(dev,
+				pos + PCI_ERR_HEADER_LOG + 4, &info->tlp.dw1);
+			pci_read_config_dword(dev,
+				pos + PCI_ERR_HEADER_LOG + 8, &info->tlp.dw2);
+			pci_read_config_dword(dev,
+				pos + PCI_ERR_HEADER_LOG + 12, &info->tlp.dw3);
+		}
+	}
+
+	return 1;
+}
+
+static inline void aer_process_err_devices(struct aer_err_info *e_info)
+{
+	int i;
+
+	/* Report all before handle them, not to lost records by reset etc. */
+	for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) {
+		if (get_device_error_info(e_info->dev[i], e_info))
+			aer_print_error(e_info->dev[i], e_info);
+	}
+	for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) {
+		if (get_device_error_info(e_info->dev[i], e_info))
+			handle_error_source(e_info->dev[i], e_info);
+	}
+}
+
+/**
+ * aer_isr_one_error - consume an error detected by root port
+ * @rpc: pointer to the root port which holds an error
+ * @e_src: pointer to an error source
+ */
+static void aer_isr_one_error(struct aer_rpc *rpc,
+		struct aer_err_source *e_src)
+{
+	struct pci_dev *pdev = rpc->rpd;
+	struct aer_err_info *e_info = &rpc->e_info;
+
+	/*
+	 * There is a possibility that both correctable error and
+	 * uncorrectable error being logged. Report correctable error first.
+	 */
+	if (e_src->status & PCI_ERR_ROOT_COR_RCV) {
+		e_info->id = ERR_COR_ID(e_src->id);
+		e_info->severity = AER_CORRECTABLE;
+
+		if (e_src->status & PCI_ERR_ROOT_MULTI_COR_RCV)
+			e_info->multi_error_valid = 1;
+		else
+			e_info->multi_error_valid = 0;
+		aer_print_port_info(pdev, e_info);
+
+		if (find_source_device(pdev, e_info))
+			aer_process_err_devices(e_info);
+	}
+
+	if (e_src->status & PCI_ERR_ROOT_UNCOR_RCV) {
+		e_info->id = ERR_UNCOR_ID(e_src->id);
+
+		if (e_src->status & PCI_ERR_ROOT_FATAL_RCV)
+			e_info->severity = AER_FATAL;
+		else
+			e_info->severity = AER_NONFATAL;
+
+		if (e_src->status & PCI_ERR_ROOT_MULTI_UNCOR_RCV)
+			e_info->multi_error_valid = 1;
+		else
+			e_info->multi_error_valid = 0;
+
+		aer_print_port_info(pdev, e_info);
+
+		if (find_source_device(pdev, e_info))
+			aer_process_err_devices(e_info);
+	}
+}
+
+/**
+ * get_e_source - retrieve an error source
+ * @rpc: pointer to the root port which holds an error
+ * @e_src: pointer to store retrieved error source
+ *
+ * Return 1 if an error source is retrieved, otherwise 0.
+ *
+ * Invoked by DPC handler to consume an error.
+ */
+static int get_e_source(struct aer_rpc *rpc, struct aer_err_source *e_src)
+{
+	unsigned long flags;
+
+	/* Lock access to Root error producer/consumer index */
+	spin_lock_irqsave(&rpc->e_lock, flags);
+	if (rpc->prod_idx == rpc->cons_idx) {
+		spin_unlock_irqrestore(&rpc->e_lock, flags);
+		return 0;
+	}
+
+	*e_src = rpc->e_sources[rpc->cons_idx];
+	rpc->cons_idx++;
+	if (rpc->cons_idx == AER_ERROR_SOURCES_MAX)
+		rpc->cons_idx = 0;
+	spin_unlock_irqrestore(&rpc->e_lock, flags);
+
+	return 1;
+}
+
+/**
+ * aer_isr - consume errors detected by root port
+ * @work: definition of this work item
+ *
+ * Invoked, as DPC, when root port records new detected error
+ */
+static void aer_isr(struct work_struct *work)
+{
+	struct aer_rpc *rpc = container_of(work, struct aer_rpc, dpc_handler);
+	struct aer_err_source uninitialized_var(e_src);
+
+	mutex_lock(&rpc->rpc_mutex);
+	while (get_e_source(rpc, &e_src))
+		aer_isr_one_error(rpc, &e_src);
+	mutex_unlock(&rpc->rpc_mutex);
+}
+
 /**
  * aer_irq - Root Port's ISR
  * @irq: IRQ assigned to Root Port
diff --git a/drivers/pci/pcie/aer/aerdrv.h b/drivers/pci/pcie/aer/aerdrv.h
index 6e0ad9a68fd9..059b89441acb 100644
--- a/drivers/pci/pcie/aer/aerdrv.h
+++ b/drivers/pci/pcie/aer/aerdrv.h
@@ -77,7 +77,6 @@ struct aer_rpc {
 };
 
 extern struct bus_type pcie_port_bus_type;
-void aer_isr(struct work_struct *work);
 void aer_print_error(struct pci_dev *dev, struct aer_err_info *info);
 void aer_print_port_info(struct pci_dev *dev, struct aer_err_info *info);
 irqreturn_t aer_irq(int irq, void *context);
diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c
deleted file mode 100644
index 42d4f3f32282..000000000000
--- a/drivers/pci/pcie/aer/aerdrv_core.c
+++ /dev/null
@@ -1,496 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Implement the core part of PCIe AER. When a PCIe error is delivered, an
- * error message will be collected and printed to console, then an error
- * recovery procedure will be executed by following the PCI error recovery
- * rules.
- *
- * 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/kernel.h>
-#include <linux/errno.h>
-#include <linux/pm.h>
-#include <linux/suspend.h>
-#include <linux/delay.h>
-#include <linux/slab.h>
-#include <linux/kfifo.h>
-#include "aerdrv.h"
-#include "../../pci.h"
-
-#define	PCI_EXP_AER_FLAGS	(PCI_EXP_DEVCTL_CERE | PCI_EXP_DEVCTL_NFERE | \
-				 PCI_EXP_DEVCTL_FERE | PCI_EXP_DEVCTL_URRE)
-
-int pci_enable_pcie_error_reporting(struct pci_dev *dev)
-{
-	if (pcie_aer_get_firmware_first(dev))
-		return -EIO;
-
-	if (!dev->aer_cap)
-		return -EIO;
-
-	return pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_AER_FLAGS);
-}
-EXPORT_SYMBOL_GPL(pci_enable_pcie_error_reporting);
-
-int pci_disable_pcie_error_reporting(struct pci_dev *dev)
-{
-	if (pcie_aer_get_firmware_first(dev))
-		return -EIO;
-
-	return pcie_capability_clear_word(dev, PCI_EXP_DEVCTL,
-					  PCI_EXP_AER_FLAGS);
-}
-EXPORT_SYMBOL_GPL(pci_disable_pcie_error_reporting);
-
-int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev)
-{
-	int pos;
-	u32 status;
-
-	pos = dev->aer_cap;
-	if (!pos)
-		return -EIO;
-
-	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
-	if (status)
-		pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(pci_cleanup_aer_uncorrect_error_status);
-
-int pci_cleanup_aer_error_status_regs(struct pci_dev *dev)
-{
-	int pos;
-	u32 status;
-	int port_type;
-
-	if (!pci_is_pcie(dev))
-		return -ENODEV;
-
-	pos = dev->aer_cap;
-	if (!pos)
-		return -EIO;
-
-	port_type = pci_pcie_type(dev);
-	if (port_type == PCI_EXP_TYPE_ROOT_PORT) {
-		pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &status);
-		pci_write_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, status);
-	}
-
-	pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status);
-	pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, status);
-
-	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
-	pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status);
-
-	return 0;
-}
-
-int pci_aer_init(struct pci_dev *dev)
-{
-	dev->aer_cap = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
-	return pci_cleanup_aer_error_status_regs(dev);
-}
-
-/**
- * add_error_device - list device to be handled
- * @e_info: pointer to error info
- * @dev: pointer to pci_dev to be added
- */
-static int add_error_device(struct aer_err_info *e_info, struct pci_dev *dev)
-{
-	if (e_info->error_dev_num < AER_MAX_MULTI_ERR_DEVICES) {
-		e_info->dev[e_info->error_dev_num] = dev;
-		e_info->error_dev_num++;
-		return 0;
-	}
-	return -ENOSPC;
-}
-
-/**
- * is_error_source - check whether the device is source of reported error
- * @dev: pointer to pci_dev to be checked
- * @e_info: pointer to reported error info
- */
-static bool is_error_source(struct pci_dev *dev, struct aer_err_info *e_info)
-{
-	int pos;
-	u32 status, mask;
-	u16 reg16;
-
-	/*
-	 * When bus id is equal to 0, it might be a bad id
-	 * reported by root port.
-	 */
-	if ((PCI_BUS_NUM(e_info->id) != 0) &&
-	    !(dev->bus->bus_flags & PCI_BUS_FLAGS_NO_AERSID)) {
-		/* Device ID match? */
-		if (e_info->id == ((dev->bus->number << 8) | dev->devfn))
-			return true;
-
-		/* Continue id comparing if there is no multiple error */
-		if (!e_info->multi_error_valid)
-			return false;
-	}
-
-	/*
-	 * When either
-	 *      1) bus id is equal to 0. Some ports might lose the bus
-	 *              id of error source id;
-	 *      2) bus flag PCI_BUS_FLAGS_NO_AERSID is set
-	 *      3) There are multiple errors and prior ID comparing fails;
-	 * We check AER status registers to find possible reporter.
-	 */
-	if (atomic_read(&dev->enable_cnt) == 0)
-		return false;
-
-	/* Check if AER is enabled */
-	pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &reg16);
-	if (!(reg16 & PCI_EXP_AER_FLAGS))
-		return false;
-
-	pos = dev->aer_cap;
-	if (!pos)
-		return false;
-
-	/* Check if error is recorded */
-	if (e_info->severity == AER_CORRECTABLE) {
-		pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status);
-		pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, &mask);
-	} else {
-		pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
-		pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, &mask);
-	}
-	if (status & ~mask)
-		return true;
-
-	return false;
-}
-
-static int find_device_iter(struct pci_dev *dev, void *data)
-{
-	struct aer_err_info *e_info = (struct aer_err_info *)data;
-
-	if (is_error_source(dev, e_info)) {
-		/* List this device */
-		if (add_error_device(e_info, dev)) {
-			/* We cannot handle more... Stop iteration */
-			/* TODO: Should print error message here? */
-			return 1;
-		}
-
-		/* If there is only a single error, stop iteration */
-		if (!e_info->multi_error_valid)
-			return 1;
-	}
-	return 0;
-}
-
-/**
- * find_source_device - search through device hierarchy for source device
- * @parent: pointer to Root Port pci_dev data structure
- * @e_info: including detailed error information such like id
- *
- * Return true if found.
- *
- * Invoked by DPC when error is detected at the Root Port.
- * Caller of this function must set id, severity, and multi_error_valid of
- * struct aer_err_info pointed by @e_info properly.  This function must fill
- * e_info->error_dev_num and e_info->dev[], based on the given information.
- */
-static bool find_source_device(struct pci_dev *parent,
-		struct aer_err_info *e_info)
-{
-	struct pci_dev *dev = parent;
-	int result;
-
-	/* Must reset in this function */
-	e_info->error_dev_num = 0;
-
-	/* Is Root Port an agent that sends error message? */
-	result = find_device_iter(dev, e_info);
-	if (result)
-		return true;
-
-	pci_walk_bus(parent->subordinate, find_device_iter, e_info);
-
-	if (!e_info->error_dev_num) {
-		pci_printk(KERN_DEBUG, parent, "can't find device of ID%04x\n",
-			   e_info->id);
-		return false;
-	}
-	return true;
-}
-
-/**
- * handle_error_source - handle logging error into an event log
- * @dev: pointer to pci_dev data structure of error source device
- * @info: comprehensive error information
- *
- * Invoked when an error being detected by Root Port.
- */
-static void handle_error_source(struct pci_dev *dev, struct aer_err_info *info)
-{
-	int pos;
-
-	if (info->severity == AER_CORRECTABLE) {
-		/*
-		 * Correctable error does not need software intervention.
-		 * No need to go through error recovery process.
-		 */
-		pos = dev->aer_cap;
-		if (pos)
-			pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS,
-					info->status);
-	} else if (info->severity == AER_NONFATAL)
-		pcie_do_nonfatal_recovery(dev);
-	else if (info->severity == AER_FATAL)
-		pcie_do_fatal_recovery(dev, PCIE_PORT_SERVICE_AER);
-}
-
-#ifdef CONFIG_ACPI_APEI_PCIEAER
-
-#define AER_RECOVER_RING_ORDER		4
-#define AER_RECOVER_RING_SIZE		(1 << AER_RECOVER_RING_ORDER)
-
-struct aer_recover_entry {
-	u8	bus;
-	u8	devfn;
-	u16	domain;
-	int	severity;
-	struct aer_capability_regs *regs;
-};
-
-static DEFINE_KFIFO(aer_recover_ring, struct aer_recover_entry,
-		    AER_RECOVER_RING_SIZE);
-
-static void aer_recover_work_func(struct work_struct *work)
-{
-	struct aer_recover_entry entry;
-	struct pci_dev *pdev;
-
-	while (kfifo_get(&aer_recover_ring, &entry)) {
-		pdev = pci_get_domain_bus_and_slot(entry.domain, entry.bus,
-						   entry.devfn);
-		if (!pdev) {
-			pr_err("AER recover: Can not find pci_dev for %04x:%02x:%02x:%x\n",
-			       entry.domain, entry.bus,
-			       PCI_SLOT(entry.devfn), PCI_FUNC(entry.devfn));
-			continue;
-		}
-		cper_print_aer(pdev, entry.severity, entry.regs);
-		if (entry.severity == AER_NONFATAL)
-			pcie_do_nonfatal_recovery(pdev);
-		else if (entry.severity == AER_FATAL)
-			pcie_do_fatal_recovery(pdev, PCIE_PORT_SERVICE_AER);
-		pci_dev_put(pdev);
-	}
-}
-
-/*
- * Mutual exclusion for writers of aer_recover_ring, reader side don't
- * need lock, because there is only one reader and lock is not needed
- * between reader and writer.
- */
-static DEFINE_SPINLOCK(aer_recover_ring_lock);
-static DECLARE_WORK(aer_recover_work, aer_recover_work_func);
-
-void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn,
-		       int severity, struct aer_capability_regs *aer_regs)
-{
-	unsigned long flags;
-	struct aer_recover_entry entry = {
-		.bus		= bus,
-		.devfn		= devfn,
-		.domain		= domain,
-		.severity	= severity,
-		.regs		= aer_regs,
-	};
-
-	spin_lock_irqsave(&aer_recover_ring_lock, flags);
-	if (kfifo_put(&aer_recover_ring, entry))
-		schedule_work(&aer_recover_work);
-	else
-		pr_err("AER recover: Buffer overflow when recovering AER for %04x:%02x:%02x:%x\n",
-		       domain, bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
-	spin_unlock_irqrestore(&aer_recover_ring_lock, flags);
-}
-EXPORT_SYMBOL_GPL(aer_recover_queue);
-#endif
-
-/**
- * get_device_error_info - read error status from dev and store it to info
- * @dev: pointer to the device expected to have a error record
- * @info: pointer to structure to store the error record
- *
- * Return 1 on success, 0 on error.
- *
- * Note that @info is reused among all error devices. Clear fields properly.
- */
-static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info)
-{
-	int pos, temp;
-
-	/* Must reset in this function */
-	info->status = 0;
-	info->tlp_header_valid = 0;
-
-	pos = dev->aer_cap;
-
-	/* The device might not support AER */
-	if (!pos)
-		return 0;
-
-	if (info->severity == AER_CORRECTABLE) {
-		pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS,
-			&info->status);
-		pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK,
-			&info->mask);
-		if (!(info->status & ~info->mask))
-			return 0;
-	} else if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
-		info->severity == AER_NONFATAL) {
-
-		/* Link is still healthy for IO reads */
-		pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
-			&info->status);
-		pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK,
-			&info->mask);
-		if (!(info->status & ~info->mask))
-			return 0;
-
-		/* Get First Error Pointer */
-		pci_read_config_dword(dev, pos + PCI_ERR_CAP, &temp);
-		info->first_error = PCI_ERR_CAP_FEP(temp);
-
-		if (info->status & AER_LOG_TLP_MASKS) {
-			info->tlp_header_valid = 1;
-			pci_read_config_dword(dev,
-				pos + PCI_ERR_HEADER_LOG, &info->tlp.dw0);
-			pci_read_config_dword(dev,
-				pos + PCI_ERR_HEADER_LOG + 4, &info->tlp.dw1);
-			pci_read_config_dword(dev,
-				pos + PCI_ERR_HEADER_LOG + 8, &info->tlp.dw2);
-			pci_read_config_dword(dev,
-				pos + PCI_ERR_HEADER_LOG + 12, &info->tlp.dw3);
-		}
-	}
-
-	return 1;
-}
-
-static inline void aer_process_err_devices(struct aer_err_info *e_info)
-{
-	int i;
-
-	/* Report all before handle them, not to lost records by reset etc. */
-	for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) {
-		if (get_device_error_info(e_info->dev[i], e_info))
-			aer_print_error(e_info->dev[i], e_info);
-	}
-	for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) {
-		if (get_device_error_info(e_info->dev[i], e_info))
-			handle_error_source(e_info->dev[i], e_info);
-	}
-}
-
-/**
- * aer_isr_one_error - consume an error detected by root port
- * @rpc: pointer to the root port which holds an error
- * @e_src: pointer to an error source
- */
-static void aer_isr_one_error(struct aer_rpc *rpc,
-		struct aer_err_source *e_src)
-{
-	struct pci_dev *pdev = rpc->rpd;
-	struct aer_err_info *e_info = &rpc->e_info;
-
-	/*
-	 * There is a possibility that both correctable error and
-	 * uncorrectable error being logged. Report correctable error first.
-	 */
-	if (e_src->status & PCI_ERR_ROOT_COR_RCV) {
-		e_info->id = ERR_COR_ID(e_src->id);
-		e_info->severity = AER_CORRECTABLE;
-
-		if (e_src->status & PCI_ERR_ROOT_MULTI_COR_RCV)
-			e_info->multi_error_valid = 1;
-		else
-			e_info->multi_error_valid = 0;
-		aer_print_port_info(pdev, e_info);
-
-		if (find_source_device(pdev, e_info))
-			aer_process_err_devices(e_info);
-	}
-
-	if (e_src->status & PCI_ERR_ROOT_UNCOR_RCV) {
-		e_info->id = ERR_UNCOR_ID(e_src->id);
-
-		if (e_src->status & PCI_ERR_ROOT_FATAL_RCV)
-			e_info->severity = AER_FATAL;
-		else
-			e_info->severity = AER_NONFATAL;
-
-		if (e_src->status & PCI_ERR_ROOT_MULTI_UNCOR_RCV)
-			e_info->multi_error_valid = 1;
-		else
-			e_info->multi_error_valid = 0;
-
-		aer_print_port_info(pdev, e_info);
-
-		if (find_source_device(pdev, e_info))
-			aer_process_err_devices(e_info);
-	}
-}
-
-/**
- * get_e_source - retrieve an error source
- * @rpc: pointer to the root port which holds an error
- * @e_src: pointer to store retrieved error source
- *
- * Return 1 if an error source is retrieved, otherwise 0.
- *
- * Invoked by DPC handler to consume an error.
- */
-static int get_e_source(struct aer_rpc *rpc, struct aer_err_source *e_src)
-{
-	unsigned long flags;
-
-	/* Lock access to Root error producer/consumer index */
-	spin_lock_irqsave(&rpc->e_lock, flags);
-	if (rpc->prod_idx == rpc->cons_idx) {
-		spin_unlock_irqrestore(&rpc->e_lock, flags);
-		return 0;
-	}
-
-	*e_src = rpc->e_sources[rpc->cons_idx];
-	rpc->cons_idx++;
-	if (rpc->cons_idx == AER_ERROR_SOURCES_MAX)
-		rpc->cons_idx = 0;
-	spin_unlock_irqrestore(&rpc->e_lock, flags);
-
-	return 1;
-}
-
-/**
- * aer_isr - consume errors detected by root port
- * @work: definition of this work item
- *
- * Invoked, as DPC, when root port records new detected error
- */
-void aer_isr(struct work_struct *work)
-{
-	struct aer_rpc *rpc = container_of(work, struct aer_rpc, dpc_handler);
-	struct aer_err_source uninitialized_var(e_src);
-
-	mutex_lock(&rpc->rpc_mutex);
-	while (get_e_source(rpc, &e_src))
-		aer_isr_one_error(rpc, &e_src);
-	mutex_unlock(&rpc->rpc_mutex);
-}