[Spice-devel] [PATCH qxl-wddm-dod 03/26] Add printer class to dump debug print statements to kernel debugger output

[Sameeh Jubran]

From: Sandy Stutsman <sstutsma at redhat.com>

Allows the usage of Kd_IHVVIDEO_Mask to control print level while debugging

Signed-off-by: Sameeh Jubran <sameeh at daynix.com>
---
 qxldod/driver.cpp | 24 +++++++++++++++++++++++-
 qxldod/driver.h   | 20 ++++++++++++++++----
 2 files changed, 39 insertions(+), 5 deletions(-)

diff --git a/qxldod/driver.cpp b/qxldod/driver.cpp
index 4d1913c..d9946aa 100755
--- a/qxldod/driver.cpp
+++ b/qxldod/driver.cpp
@@ -667,7 +667,29 @@ void DebugPrintFunc(const char *format, ...)
     va_start(list, format);
     vDbgPrintEx(DPFLTR_DEFAULT_ID, 9 | DPFLTR_MASK, format, list);
 }
+
+kd_debug_printer::kd_debug_printer(ULONG level)
+{
+    static const ULONG xlate[] = { 0, 0, 1, 2, 3 };
+    if (!level || level > 5) {
+        _level = 0xffffffff;
+
+    }
+    else {
+        _level = xlate[level - 1];
+    }
+}
+
+void kd_debug_printer::print(const char * fmt, ...)
+{
+    if (_level == 0xffffffff) {
+        return;
+    }
+    va_list list;
+    va_start(list, fmt);
+    vDbgPrintEx(DPFLTR_IHVVIDEO_ID, _level, fmt, list);
+    va_end(list);
+}
 #endif
 
 #pragma code_seg(pop) // End Non-Paged Code
-
diff --git a/qxldod/driver.h b/qxldod/driver.h
index e64c098..752f8e4 100755
--- a/qxldod/driver.h
+++ b/qxldod/driver.h
@@ -208,15 +208,27 @@ DodSystemDisplayWrite(
     _In_  UINT  PositionY);
 
 #if DBG
+class kd_debug_printer 
+{
+public:
+    kd_debug_printer(ULONG level);
+    void print(const char * fmt, ...);
+private:
+    ULONG _level;
+ };
 
 extern int nDebugLevel;
 void DebugPrintFuncSerial(const char *format, ...);
 
-void DebugPrintFunc(const char *format, ...);
+void DebugPrintFunc(const char *format, ...);
+
+#define DbgPrint(level, line)           \
+    if (level > nDebugLevel) {}         \
+    else {                              \
+       DebugPrintFuncSerial line;       \
+     }                                  \
+     kd_debug_printer(level).print line
 
-#define DbgPrint(level, line) \
-    if (level > nDebugLevel) {} \
-    else DebugPrintFuncSerial line
 #else
 #define DbgPrint(level, line) 
 #endif
-- 
2.7.0.windows.1