tracing: add trace event for memory-failure

RAS user space tools like rasdaemon which base on trace event, could
receive mce error event, but no memory recovery result event.  So, I want
to add this event to make this scenario complete.

This patch add a event at ras group for memory-failure.

The output like below:
#  tracer: nop
#
#  entries-in-buffer/entries-written: 2/2   #P:24
#
#                               _-----=> irqs-off
#                              / _----=> need-resched
#                             | / _---=> hardirq/softirq
#                             || / _--=> preempt-depth
#                             ||| /     delay
#            TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
#               | |       |   ||||       |         |
       mce-inject-13150 [001] ....   277.019359: memory_failure_event: pfn 0x19869: recovery action for free buddy page: Delayed

[xiexiuqi@huawei.com: fix build error]
Signed-off-by: Xie XiuQi <xiexiuqi@huawei.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Chen Gong <gong.chen@linux.intel.com>
Cc: Jim Davis <jim.epost@gmail.com>
Signed-off-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 89 insertions, 0 deletions

diff --git a/include/ras/ras_event.h b/include/ras/ras_event.h
index 79abb9c71772..1443d79e4fe6 100644
--- a/include/ras/ras_event.h
+++ b/include/ras/ras_event.h
@@ -11,6 +11,7 @@
 #include <linux/pci.h>
 #include <linux/aer.h>
 #include <linux/cper.h>
+#include <linux/mm.h>
 
 /*
  * MCE Extended Error Log trace event
@@ -232,6 +233,90 @@ TRACE_EVENT(aer_event,
                 __print_flags(__entry->status, "|", aer_uncorrectable_errors))
 );
 
+/*
+ * memory-failure recovery action result event
+ *
+ * unsigned long pfn -  Page Frame Number of the corrupted page
+ * int type     -       Page types of the corrupted page
+ * int result   -       Result of recovery action
+ */
+
+#ifdef CONFIG_MEMORY_FAILURE
+#define MF_ACTION_RESULT        \
+        EM ( MF_IGNORED, "Ignored" )    \
+        EM ( MF_FAILED,  "Failed" )     \
+        EM ( MF_DELAYED, "Delayed" )    \
+        EMe ( MF_RECOVERED, "Recovered" )
+
+#define MF_PAGE_TYPE            \
+        EM ( MF_MSG_KERNEL, "reserved kernel page" )                    \
+        EM ( MF_MSG_KERNEL_HIGH_ORDER, "high-order kernel page" )       \
+        EM ( MF_MSG_SLAB, "kernel slab page" )                          \
+        EM ( MF_MSG_DIFFERENT_COMPOUND, "different compound page after locking" ) \
+        EM ( MF_MSG_POISONED_HUGE, "huge page already hardware poisoned" )      \
+        EM ( MF_MSG_HUGE, "huge page" )                                 \
+        EM ( MF_MSG_FREE_HUGE, "free huge page" )                       \
+        EM ( MF_MSG_UNMAP_FAILED, "unmapping failed page" )             \
+        EM ( MF_MSG_DIRTY_SWAPCACHE, "dirty swapcache page" )           \
+        EM ( MF_MSG_CLEAN_SWAPCACHE, "clean swapcache page" )           \
+        EM ( MF_MSG_DIRTY_MLOCKED_LRU, "dirty mlocked LRU page" )       \
+        EM ( MF_MSG_CLEAN_MLOCKED_LRU, "clean mlocked LRU page" )       \
+        EM ( MF_MSG_DIRTY_UNEVICTABLE_LRU, "dirty unevictable LRU page" )       \
+        EM ( MF_MSG_CLEAN_UNEVICTABLE_LRU, "clean unevictable LRU page" )       \
+        EM ( MF_MSG_DIRTY_LRU, "dirty LRU page" )                       \
+        EM ( MF_MSG_CLEAN_LRU, "clean LRU page" )                       \
+        EM ( MF_MSG_TRUNCATED_LRU, "already truncated LRU page" )       \
+        EM ( MF_MSG_BUDDY, "free buddy page" )                          \
+        EM ( MF_MSG_BUDDY_2ND, "free buddy page (2nd try)" )            \
+        EMe ( MF_MSG_UNKNOWN, "unknown page" )
+
+/*
+ * First define the enums in MM_ACTION_RESULT to be exported to userspace
+ * via TRACE_DEFINE_ENUM().
+ */
+#undef EM
+#undef EMe
+#define EM(a, b) TRACE_DEFINE_ENUM(a);
+#define EMe(a, b)       TRACE_DEFINE_ENUM(a);
+
+MF_ACTION_RESULT
+MF_PAGE_TYPE
+
+/*
+ * Now redefine the EM() and EMe() macros to map the enums to the strings
+ * that will be printed in the output.
+ */
+#undef EM
+#undef EMe
+#define EM(a, b)                { a, b },
+#define EMe(a, b)       { a, b }
+
+TRACE_EVENT(memory_failure_event,
+        TP_PROTO(unsigned long pfn,
+                 int type,
+                 int result),
+
+        TP_ARGS(pfn, type, result),
+
+        TP_STRUCT__entry(
+                __field(unsigned long, pfn)
+                __field(int, type)
+                __field(int, result)
+        ),
+
+        TP_fast_assign(
+                __entry->pfn    = pfn;
+                __entry->type   = type;
+                __entry->result = result;
+        ),
+
+        TP_printk("pfn %#lx: recovery action for %s: %s",
+                __entry->pfn,
+                __print_symbolic(__entry->type, MF_PAGE_TYPE),
+                __print_symbolic(__entry->result, MF_ACTION_RESULT)
+        )
+);
+#endif /* CONFIG_MEMORY_FAILURE */
 #endif /* _TRACE_HW_EVENT_MC_H */
 
 /* This part must be outside protection */
diff --git a/mm/Kconfig b/mm/Kconfig
index 390214da4546..c180af880ed5 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -368,6 +368,7 @@ config MEMORY_FAILURE
         depends on ARCH_SUPPORTS_MEMORY_FAILURE
         bool "Enable recovery from hardware memory errors"
         select MEMORY_ISOLATION
+        select RAS
         help
           Enables code to recover from some memory failures on systems
           with MCA recovery. This allows a system to continue running
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 15c0d5ab0893..c53543d89282 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -57,6 +57,7 @@
 #include <linux/mm_inline.h>
 #include <linux/kfifo.h>
 #include "internal.h"
+#include "ras/ras_event.h"
 
 int sysctl_memory_failure_early_kill __read_mostly = 0;
 
@@ -855,6 +856,8 @@ static struct page_state {
 static void action_result(unsigned long pfn, enum mf_action_page_type type,
                           enum mf_result result)
 {
+        trace_memory_failure_event(pfn, type, result);
+
         pr_err("MCE %#lx: recovery action for %s: %s\n",
                 pfn, action_page_types[type], action_name[result]);
 }