powerpc/eeh: Refactor the output message

We needn't the the whole backtrace other than one-line message in
the error reporting interrupt handler. For errors triggered by
access PCI config space or MMIO, we replace "WARN(1, ...)" with
pr_err() and dump_stack(). The patch also adds more output messages
to indicate what EEH core is doing. Besides, some printk() are
replaced with pr_warning().

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

1 files changed, 7 insertions, 2 deletions

diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c
index 416fb432d7e2..3a8f82fd9005 100644
--- a/arch/powerpc/kernel/eeh.c
+++ b/arch/powerpc/kernel/eeh.c
@@ -329,7 +329,9 @@ static int eeh_phb_check_failure(struct eeh_pe *pe)
         eeh_serialize_unlock(flags);
         eeh_send_failure_event(phb_pe);
 
-        WARN(1, "EEH: PHB failure detected\n");
+        pr_err("EEH: PHB#%x failure detected\n",
+                phb_pe->phb->global_number);
+        dump_stack();
 
         return 1;
 out:
@@ -458,7 +460,10 @@ int eeh_dev_check_failure(struct eeh_dev *edev)
          * a stack trace will help the device-driver authors figure
          * out what happened.  So print that out.
          */
-        WARN(1, "EEH: failure detected\n");
+        pr_err("EEH: Frozen PE#%x detected on PHB#%x\n",
+                pe->addr, pe->phb->global_number);
+        dump_stack();
+
         return 1;
 
 dn_unlock: