[PATCH 25/27] powerpc/eeh: Register OPAL notifier for PCI error

[Gavin Shan]

The patch intends to register OPAL event notifier and process the
PCI errors from firmware. If we have pending PCI errors, the kthread
will be invoke to handle that in turn.

Signed-off-by: Gavin Shan <shangw at linux.vnet.ibm.com>
---
 arch/powerpc/platforms/powernv/pci-err.c |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/pci-err.c b/arch/powerpc/platforms/powernv/pci-err.c
index bfc95c6..d77dd61 100644
--- a/arch/powerpc/platforms/powernv/pci-err.c
+++ b/arch/powerpc/platforms/powernv/pci-err.c
@@ -64,6 +64,12 @@ static struct semaphore pci_err_int_sem;
 static struct semaphore pci_err_seq_sem;
 static char *pci_err_diag;
 
+static void pci_err_event(u64 event)
+{
+	/* Notify kthread to process error */
+	up(&pci_err_int_sem);
+}
+
 static void pci_err_take(void)
 {
 	down(&pci_err_seq_sem);
@@ -451,6 +457,14 @@ static int __init pci_err_init(void)
 	sema_init(&pci_err_int_sem, 0);
 	sema_init(&pci_err_seq_sem, 1);
 
+	/* Register OPAL event notifier */
+	ret = opal_notifier_register(OPAL_EVENT_PCI_ERROR, pci_err_event);
+	if (ret) {
+		pr_err("%s: Failed to register OPAL notifier, rc=%d\n",
+			__func__, ret);
+		goto out;
+	}
+
 	/* Start kthread */
 	pci_err_thread = kthread_run(pci_err_handler, NULL, "PCI_ERR");
 	if (IS_ERR(pci_err_thread)) {
@@ -459,6 +473,7 @@ static int __init pci_err_init(void)
 			__func__, ret);
 	}
 
+out:
 	free_page((unsigned long)pci_err_diag);
 	return ret;
 }
-- 
1.7.5.4