aerdrv: Trace Event for PCI Express Advanced Error Reporting

This header file will define a new trace event that will be triggered when
a AER event occurs.  The following data will be provided to the trace
event.

char * dev_name - The name of the slot where the device resides
                  ([domain:]bus:device.function).

u32 status - Either the correctable or uncorrectable register
             indicating what error or errors have been see.

u8 severity - error severity 0:NONFATAL 1:FATAL 2:CORRECTED

The trace event will also provide a trace string that may look like:

"0000:05:00.0 PCIe Bus Error:severity=Uncorrected (Non-Fatal), Poisoned
TLP"

Signed-off-by: Lance Ortiz <lance.ortiz@hp.com>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: Boris Petkov <bp@alien8.de>
Signed-off-by: Tony Luck <tony.luck@intel.com>

diff --git a/include/trace/events/ras.h b/include/trace/events/ras.h
new file mode 100644 (file)
index 0000000..88b8783
--- /dev/null
+++ b/include/trace/events/ras.h
@@ -0,0 +1,77 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM ras
+
+#if !defined(_TRACE_AER_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_AER_H
+
+#include <linux/tracepoint.h>
+#include <linux/edac.h>
+
+
+/*
+ * PCIe AER Trace event
+ *
+ * These events are generated when hardware detects a corrected or
+ * uncorrected event on a PCIe device. The event report has
+ * the following structure:
+ *
+ * char * dev_name -   The name of the slot where the device resides
+ *                     ([domain:]bus:device.function).
+ * u32 status -                Either the correctable or uncorrectable register
+ *                     indicating what error or errors have been seen
+ * u8 severity -       error severity 0:NONFATAL 1:FATAL 2:CORRECTED
+ */
+
+#define aer_correctable_errors         \
+       {BIT(0),        "Receiver Error"},              \
+       {BIT(6),        "Bad TLP"},                     \
+       {BIT(7),        "Bad DLLP"},                    \
+       {BIT(8),        "RELAY_NUM Rollover"},          \
+       {BIT(12),       "Replay Timer Timeout"},        \
+       {BIT(13),       "Advisory Non-Fatal"}
+
+#define aer_uncorrectable_errors               \
+       {BIT(4),        "Data Link Protocol"},          \
+       {BIT(12),       "Poisoned TLP"},                \
+       {BIT(13),       "Flow Control Protocol"},       \
+       {BIT(14),       "Completion Timeout"},          \
+       {BIT(15),       "Completer Abort"},             \
+       {BIT(16),       "Unexpected Completion"},       \
+       {BIT(17),       "Receiver Overflow"},           \
+       {BIT(18),       "Malformed TLP"},               \
+       {BIT(19),       "ECRC"},                        \
+       {BIT(20),       "Unsupported Request"}
+
+TRACE_EVENT(aer_event,
+       TP_PROTO(const char *dev_name,
+                const u32 status,
+                const u8 severity),
+
+       TP_ARGS(dev_name, status, severity),
+
+       TP_STRUCT__entry(
+               __string(       dev_name,       dev_name        )
+               __field(        u32,            status          )
+               __field(        u8,             severity        )
+       ),
+
+       TP_fast_assign(
+               __assign_str(dev_name, dev_name);
+               __entry->status         = status;
+               __entry->severity       = severity;
+       ),
+
+       TP_printk("%s PCIe Bus Error: severity=%s, %s\n",
+               __get_str(dev_name),
+               __entry->severity == HW_EVENT_ERR_CORRECTED ? "Corrected" :
+                       __entry->severity == HW_EVENT_ERR_FATAL ?
+                       "Fatal" : "Uncorrected",
+               __entry->severity == HW_EVENT_ERR_CORRECTED ?
+               __print_flags(__entry->status, "|", aer_correctable_errors) :
+               __print_flags(__entry->status, "|", aer_uncorrectable_errors))
+);
+
+#endif /* _TRACE_AER_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>