[Media Common] add linux media driver call stack capture support

media driver call stack capture support in linux stage 2: media driver call stack dump with keyword enabled.
jbeich · May 13, 2022 · b66bb0c · b66bb0c
1 parent 531abde
commit b66bb0c
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diff --git a/media_common/agnostic/common/os/mos_os_trace_event.h b/media_common/agnostic/common/os/mos_os_trace_event.h
@@ -95,6 +95,7 @@ typedef enum _MEDIA_EVENT_FILTER_KEYID
     TR_KEY_DECODE_DSTYUV,
     TR_KEY_DECODE_REFYUV,
     TR_KEY_MOSMSG_ALL = 12,
+    TR_KEY_CALL_STACK,
     TR_KEY_DATA_DUMP  = 16,
     TR_KEY_MOSMSG_CP,
     TR_KEY_MOSMSG_VP,
@@ -271,6 +272,7 @@ typedef enum _MEDIA_EVENT
     EVENT_DECODE_FEATURE_DECODEMODE_REPORT,        //! event for Decode Feature Decode Mode Report
     EVENT_DECODE_DST_DUMPINFO,                     //! event for Decode Dst Surface Info
     EVENT_DECODE_REF_DUMPINFO,                     //! event for Decode Ref Surface Info
+    EVENT_CALL_STACK,                              //! event for call stack dump
 } MEDIA_EVENT;
 
 typedef enum _MEDIA_EVENT_TYPE

diff --git a/media_softlet/linux/common/os/osservice/mos_utilities_specific_next.cpp b/media_softlet/linux/common/os/osservice/mos_utilities_specific_next.cpp
@@ -51,6 +51,7 @@
 #include <signal.h>
 #include <unistd.h>  // fork
 #include <algorithm>
+#include <execinfo.h> // backtrace
 
 const char           *MosUtilitiesSpecificNext::m_szUserFeatureFile     = USER_FEATURE_FILE;
 MOS_PUF_KEYLIST      MosUtilitiesSpecificNext::m_ufKeyList              = nullptr;
@@ -2488,6 +2489,25 @@ void MosUtilities::MosTraceEvent(
                 MOS_FreeMemory(pTraceBuf);
             }
         }
+        if (m_mosTraceFilter & (1ULL << TR_KEY_CALL_STACK))
+        {
+            // reserve space for header and stack size field.
+            // max 32-2=30 layers call stack in 64bit driver.
+            uint32_t nLen = 4*sizeof(uint32_t);
+            void **stack = (void **)(traceBuf + nLen);
+            int num = backtrace(stack, ((sizeof(traceBuf)-nLen)/sizeof(void *)));
+            if (num > 0)
+            {
+                uint32_t *header = (uint32_t *)traceBuf;
+
+                header[0] = 0x494D5445; // IMTE (IntelMediaTraceEvent) as ftrace raw marker tag
+                header[1] = (EVENT_CALL_STACK << 16) | (num*sizeof(void *)+sizeof(uint32_t));
+                header[2] = 0;
+                header[3] = (uint32_t)num;
+                nLen += num*sizeof(void *);
+                size_t ret = write(MosUtilitiesSpecificNext::m_mosTraceFd, traceBuf, nLen);
+            }
+        }
     }
     return;
 }