[PATCH 6/9] powerpc/powernv: Support eeh_ops->event()

[Gavin Shan]

The patch implements the backend for eeh_ops->event() on PowerNV
platform so that we can allocate or destroy PHB diag-data buffer,
which is attached to eeh_pe::data.

Signed-off-by: Gavin Shan <shangw at linux.vnet.ibm.com>
---
 arch/powerpc/platforms/powernv/eeh-powernv.c |   42 +++++++++++++++++++++++++-
 arch/powerpc/platforms/pseries/eeh_pseries.c |    3 +-
 2 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c
index a59788e..cfba40a 100644
--- a/arch/powerpc/platforms/powernv/eeh-powernv.c
+++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
@@ -365,6 +365,45 @@ static int powernv_eeh_restore_config(struct device_node *dn)
 	return 0;
 }
 
+static int powernv_eeh_event(int event, void *data)
+{
+	struct eeh_pe *pe = data;
+	struct pnv_phb *phb;
+	int ret = 0;
+
+	switch (event) {
+	case EEH_EVENT_PE_ALLOC:
+		if (!pe) {
+			ret = -EINVAL;
+			break;
+		} else if (pe->data) {
+			ret = -EEXIST;
+			break;
+		}
+
+		phb = pe->phb->private_data;
+		if (phb->model == PNV_PHB_MODEL_P7IOC ||
+		    phb->model == PNV_PHB_MODEL_PHB3) {
+			pe->data = kzalloc(PNV_PCI_DIAG_BUF_SIZE, GFP_KERNEL);
+			if (!pe->data)
+				ret = -ENOMEM;
+		}
+
+		break;
+	case EEH_EVENT_PE_FREE:
+		if (pe->data) {
+			kfree(pe->data);
+			pe->data = NULL;
+		}
+
+		break;
+	default:
+		return 0;
+	}
+
+	return ret;
+}
+
 static struct eeh_ops powernv_eeh_ops = {
 	.name                   = "powernv",
 	.init                   = powernv_eeh_init,
@@ -381,7 +420,8 @@ static struct eeh_ops powernv_eeh_ops = {
 	.read_config            = pnv_pci_cfg_read,
 	.write_config           = pnv_pci_cfg_write,
 	.next_error		= powernv_eeh_next_error,
-	.restore_config		= powernv_eeh_restore_config
+	.restore_config		= powernv_eeh_restore_config,
+	.event			= powernv_eeh_event
 };
 
 /**
diff --git a/arch/powerpc/platforms/pseries/eeh_pseries.c b/arch/powerpc/platforms/pseries/eeh_pseries.c
index 8a8f047..b9a4ddb 100644
--- a/arch/powerpc/platforms/pseries/eeh_pseries.c
+++ b/arch/powerpc/platforms/pseries/eeh_pseries.c
@@ -691,7 +691,8 @@ static struct eeh_ops pseries_eeh_ops = {
 	.read_config		= pseries_eeh_read_config,
 	.write_config		= pseries_eeh_write_config,
 	.next_error		= NULL,
-	.restore_config		= NULL
+	.restore_config		= NULL,
+	.event			= NULL
 };
 
 /**
-- 
1.7.10.4