[PATCH 23/23] powerpc/eeh: Add debugfs entry to inject errors

[Gavin Shan]

The patch intends to add debugfs entry powerpc/EEH/PHBx so that
the administrator can inject EEH errors to specified PCI host
bridge for testing purpose.

Signed-off-by: Gavin Shan <shangw at linux.vnet.ibm.com>
---
 arch/powerpc/platforms/powernv/eeh-ioda.c |   36 ++++++++++++++++++++++++++++-
 1 files changed, 35 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/eeh-ioda.c b/arch/powerpc/platforms/powernv/eeh-ioda.c
index ec5c524..4cc9db7 100644
--- a/arch/powerpc/platforms/powernv/eeh-ioda.c
+++ b/arch/powerpc/platforms/powernv/eeh-ioda.c
@@ -22,6 +22,7 @@
 
 #include <linux/bootmem.h>
 #include <linux/delay.h>
+#include <linux/debugfs.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/irq.h>
@@ -43,6 +44,29 @@
 #include "powernv.h"
 #include "pci.h"
 
+static struct dentry *ioda_eeh_dbgfs = NULL;
+
+static int ioda_eeh_dbgfs_set(void *data, u64 val)
+{
+	struct pci_controller *hose = data;
+	struct pnv_phb *phb = hose->private_data;
+
+	out_be64(phb->regs + 0xD10, val);
+	return 0;
+}
+
+static int ioda_eeh_dbgfs_get(void *data, u64 *val)
+{
+	struct pci_controller *hose = data;
+	struct pnv_phb *phb = hose->private_data;
+
+	*val = in_be64(phb->regs + 0xD10);
+	return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(ioda_eeh_dbgfs_ops, ioda_eeh_dbgfs_get,
+			ioda_eeh_dbgfs_set, "0x%llx\n");
+
 /**
  * ioda_eeh_post_init - Chip dependent post initialization
  * @hose: PCI controller
@@ -54,10 +78,20 @@
 static int ioda_eeh_post_init(struct pci_controller *hose)
 {
 	struct pnv_phb *phb = hose->private_data;
+	char name[16];
+
+	/* Create EEH debugfs root if possible */
+	if (!ioda_eeh_dbgfs)
+		ioda_eeh_dbgfs = debugfs_create_dir("EEH", powerpc_debugfs_root);
 
 	/* FIXME: Enable it for PHB3 later */
-	if (phb->type == PNV_PHB_IODA1)
+	if (phb->type == PNV_PHB_IODA1) {
+		sprintf(name, "PHB%d", hose->global_number);
+		debugfs_create_file(name, 0600, ioda_eeh_dbgfs,
+				    hose, &ioda_eeh_dbgfs_ops);
+
 		phb->eeh_enabled = 1;
+	}
 
 	return 0;
 }
-- 
1.7.5.4