2 files changed, 71 insertions, 8 deletions

diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c
index 43421fbe080..9674e9f30d4 100644
--- a/drivers/pci/pcie/aer/aerdrv_core.c
+++ b/drivers/pci/pcie/aer/aerdrv_core.c
@@ -24,6 +24,7 @@
 #include <linux/suspend.h>
 #include <linux/delay.h>
 #include <linux/slab.h>
+#include <linux/kfifo.h>
 #include "aerdrv.h"
 
 static int forceload;
@@ -445,8 +446,7 @@ static struct pcie_port_service_driver *find_aer_service(struct pci_dev *dev)
 	return drv;
 }
 
-static pci_ers_result_t reset_link(struct pcie_device *aerdev,
-		struct pci_dev *dev)
+static pci_ers_result_t reset_link(struct pci_dev *dev)
 {
 	struct pci_dev *udev;
 	pci_ers_result_t status;
@@ -486,7 +486,6 @@ static pci_ers_result_t reset_link(struct pcie_device *aerdev,
 
 /**
  * do_recovery - handle nonfatal/fatal error recovery process
- * @aerdev: pointer to a pcie_device data structure of root port
  * @dev: pointer to a pci_dev data structure of agent detecting an error
  * @severity: error severity type
  *
@@ -494,8 +493,7 @@ static pci_ers_result_t reset_link(struct pcie_device *aerdev,
  * error detected message to all downstream drivers within a hierarchy in
  * question and return the returned code.
  */
-static void do_recovery(struct pcie_device *aerdev, struct pci_dev *dev,
-		int severity)
+static void do_recovery(struct pci_dev *dev, int severity)
 {
 	pci_ers_result_t status, result = PCI_ERS_RESULT_RECOVERED;
 	enum pci_channel_state state;
@@ -511,7 +509,7 @@ static void do_recovery(struct pcie_device *aerdev, struct pci_dev *dev,
 			report_error_detected);
 
 	if (severity == AER_FATAL) {
-		result = reset_link(aerdev, dev);
+		result = reset_link(dev);
 		if (result != PCI_ERS_RESULT_RECOVERED)
 			goto failed;
 	}
@@ -576,9 +574,73 @@ static void handle_error_source(struct pcie_device *aerdev,
 			pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS,
 					info->status);
 	} else
-		do_recovery(aerdev, dev, info->severity);
+		do_recovery(dev, info->severity);
 }
 
+#ifdef CONFIG_ACPI_APEI_PCIEAER
+static void aer_recover_work_func(struct work_struct *work);
+
+#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;
+};
+
+static DEFINE_KFIFO(aer_recover_ring, struct aer_recover_entry,
+		    AER_RECOVER_RING_SIZE);
+/*
+ * 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)
+{
+	unsigned long flags;
+	struct aer_recover_entry entry = {
+		.bus		= bus,
+		.devfn		= devfn,
+		.domain		= domain,
+		.severity	= severity,
+	};
+
+	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);
+
+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;
+		}
+		do_recovery(pdev, entry.severity);
+	}
+}
+#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
diff --git a/drivers/pci/pcie/aer/aerdrv_errprint.c b/drivers/pci/pcie/aer/aerdrv_errprint.c
index b07a42e0b35..3ea51736f18 100644
--- a/drivers/pci/pcie/aer/aerdrv_errprint.c
+++ b/drivers/pci/pcie/aer/aerdrv_errprint.c
@@ -204,7 +204,7 @@ void aer_print_port_info(struct pci_dev *dev, struct aer_err_info *info)
 }
 
 #ifdef CONFIG_ACPI_APEI_PCIEAER
-static int cper_severity_to_aer(int cper_severity)
+int cper_severity_to_aer(int cper_severity)
 {
 	switch (cper_severity) {
 	case CPER_SEV_RECOVERABLE:
@@ -215,6 +215,7 @@ static int cper_severity_to_aer(int cper_severity)
 		return AER_CORRECTABLE;
 	}
 }
+EXPORT_SYMBOL_GPL(cper_severity_to_aer);
 
 void cper_print_aer(const char *prefix, int cper_severity,
 		    struct aer_capability_regs *aer)