powerpc/powernv: Debugfs directory for PHB

The patch creates one debugfs directory ("powerpc/PCIxxxx") for
each PHB so that we can hook EEH error injection debugfs entry
there in proceeding patch.

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

1 files changed, 23 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 319ed61d674a..dc4ec7956967 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -13,6 +13,7 @@
 
 #include <linux/kernel.h>
 #include <linux/pci.h>
+#include <linux/debugfs.h>
 #include <linux/delay.h>
 #include <linux/string.h>
 #include <linux/init.h>
@@ -32,6 +33,7 @@
 #include <asm/iommu.h>
 #include <asm/tce.h>
 #include <asm/xics.h>
+#include <asm/debug.h>
 
 #include "powernv.h"
 #include "pci.h"
@@ -969,12 +971,33 @@ static void pnv_pci_ioda_setup_DMA(void)
         }
 }
 
+static void pnv_pci_ioda_create_dbgfs(void)
+{
+#ifdef CONFIG_DEBUG_FS
+        struct pci_controller *hose, *tmp;
+        struct pnv_phb *phb;
+        char name[16];
+
+        list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
+                phb = hose->private_data;
+
+                sprintf(name, "PCI%04x", hose->global_number);
+                phb->dbgfs = debugfs_create_dir(name, powerpc_debugfs_root);
+                if (!phb->dbgfs)
+                        pr_warning("%s: Error on creating debugfs on PHB#%x\n",
+                                __func__, hose->global_number);
+        }
+#endif /* CONFIG_DEBUG_FS */
+}
+
 static void pnv_pci_ioda_fixup(void)
 {
         pnv_pci_ioda_setup_PEs();
         pnv_pci_ioda_setup_seg();
         pnv_pci_ioda_setup_DMA();
 
+        pnv_pci_ioda_create_dbgfs();
+
 #ifdef CONFIG_EEH
         eeh_addr_cache_build();
         eeh_init();