powerpc/eeh: Debugfs for error injection

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

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/powernv/eeh-ioda.c b/arch/powerpc/platforms/powernv/eeh-ioda.c
index 2b7689ed5d18..84f3036511cb 100644
--- a/arch/powerpc/platforms/powernv/eeh-ioda.c
+++ b/arch/powerpc/platforms/powernv/eeh-ioda.c
@@ -12,6 +12,7 @@
  */
 
 #include <linux/bootmem.h>
+#include <linux/debugfs.h>
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/io.h>
@@ -64,6 +65,29 @@ static struct notifier_block ioda_eeh_nb = {
         .priority       = 0
 };
 
+#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
@@ -101,6 +125,13 @@ static int ioda_eeh_post_init(struct pci_controller *hose)
                         }
                 }
 
+#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;
         }