kfdtest: Add SDMANopPacket class

The class is very useful for triaging complex SDMA issues.

Change-Id: Ib5de729f7fc62f41e894ef98d3967e7e1745d454
Signed-off-by: Yong Zhao <Yong.Zhao@amd.com>

tests/kfdtest/src/SDMAPacket.cpp

@@ -246,3 +246,16 @@ void SDMATimePacket::InitPacket(void *destaddr) {
             packetData.ADDR_LO_UNION.DW_1_DATA, /*dst_addr_31_0*/
             packetData.ADDR_HI_UNION.DW_2_DATA); /*dst_addr_63_32*/
 }
+
+SDMANopPacket::SDMANopPacket(unsigned int count) {
+    packetSize = count;
+    packetData = reinterpret_cast<SDMA_PKT_NOP *>(calloc(count, sizeof(unsigned int)));
+
+    packetData->HEADER_UNION.op = SDMA_OP_NOP;
+    packetData->HEADER_UNION.sub_op = 0;
+    packetData->HEADER_UNION.count = count - 1;
+}
+
+SDMANopPacket::~SDMANopPacket() {
+    free(packetData);
+}

tests/kfdtest/src/SDMAPacket.hpp

@@ -158,5 +158,20 @@ class SDMATimePacket : public SDMAPacket {
     SDMA_PKT_TIMESTAMP  packetData;
 };
 
+class SDMANopPacket : public SDMAPacket {
+ public:
+    SDMANopPacket(unsigned int count = 1);
+    virtual ~SDMANopPacket(void);
+
+    // @returns Pointer to the packet
+    virtual const void *GetPacket() const { return packetData; }
+    // @returns Packet size in bytes
+    virtual unsigned int SizeInBytes() const { return packetSize; }
+
+ private:
+    SDMA_PKT_NOP *packetData;
+    unsigned int packetSize;
+};
+
 
 #endif  // __KFD_SDMA_PACKET__H__