[PATCH 27/27] powerpc/eeh: Debugfs for error injection

[Gavin Shan]

The patch creates debugfs entries (powerpc/PCIxxxx/err_injct) for
injecting EEH errors for testing purpose.

Signed-off-by: Gavin Shan <shangw at linux.vnet.ibm.com>
---
 arch/powerpc/platforms/powernv/eeh-ioda.c |   33 ++++++++++++++++++++++++++++-
 1 files changed, 32 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/eeh-ioda.c b/arch/powerpc/platforms/powernv/eeh-ioda.c
index cbef2d5..6b13405 100644
--- a/arch/powerpc/platforms/powernv/eeh-ioda.c
+++ b/arch/powerpc/platforms/powernv/eeh-ioda.c
@@ -21,6 +21,7 @@
  */
 
 #include <linux/bootmem.h>
+#include <linux/debugfs.h>
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/io.h>
@@ -43,6 +44,29 @@
 #include "powernv.h"
 #include "pci.h"
 
+#ifdef CONFIG_DEBUG_FS
+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");
+#endif /* CONFIG_DEBUG_FS */
+
 /**
  * ioda_eeh_post_init - Chip dependent post initialization
  * @hose: PCI controller
@@ -56,8 +80,15 @@ static int ioda_eeh_post_init(struct pci_controller *hose)
 	struct pnv_phb *phb = hose->private_data;
 
 	/* FIXME: Enable it for PHB3 later */
-	if (phb->type == PNV_PHB_IODA1)
+	if (phb->type == PNV_PHB_IODA1) {
+#ifdef CONFIG_DEBUG_FS
+		if (phb->dbgfs)
+			debugfs_create_file("err_injct", 0600,
+				phb->dbgfs, hose, &ioda_eeh_dbgfs_ops);
+#endif
+
 		phb->eeh_enabled = 1;
+	}
 
 	return 0;
 }
-- 
1.7.5.4