From 0aed4f9820983afabaf682af3a603f1aab1bf823 Mon Sep 17 00:00:00 2001
From: Matteo Martincigh <matteo.martincigh@arm.com>
Date: Tue, 1 Oct 2019 14:25:34 +0100
Subject: IVGCVSW-3927 Create the Timeline Label Binary Packet

 * Added a new utility function to create a Timeline Label
   Binary Packet and write it to a given buffer
 * Added new enumeration to be reused for subsequent utility
   functions
 * Added unit tests

Signed-off-by: Matteo Martincigh <matteo.martincigh@arm.com>
Change-Id: Icbabefb9050f3f3b1a30082eabf875593378001f
---
 src/profiling/ProfilingUtils.cpp | 92 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)

(limited to 'src/profiling/ProfilingUtils.cpp')

diff --git a/src/profiling/ProfilingUtils.cpp b/src/profiling/ProfilingUtils.cpp
index 588fcc11e4..23386f86f4 100644
--- a/src/profiling/ProfilingUtils.cpp
+++ b/src/profiling/ProfilingUtils.cpp
@@ -239,6 +239,98 @@ std::string GetProcessName()
     return name;
 }
 
+TimelinePacketStatus WriteTimelineLabelBinaryPacket(uint64_t profilingGuid,
+                                                    const std::string& label,
+                                                    unsigned char* buffer,
+                                                    unsigned int bufferSize,
+                                                    unsigned int& numberOfBytesWritten)
+{
+    // Initialize the ouput value
+    numberOfBytesWritten = 0;
+
+    // Check that the given buffer is valid
+    if (buffer == nullptr || bufferSize == 0)
+    {
+        return TimelinePacketStatus::BufferExhaustion;
+    }
+
+    // Utils
+    unsigned int uint32_t_size = sizeof(uint32_t);
+    unsigned int uint64_t_size = sizeof(uint64_t);
+
+    // Convert the label into a SWTrace string
+    std::vector<uint32_t> swTraceLabel;
+    bool result = StringToSwTraceString<SwTraceCharPolicy>(label, swTraceLabel);
+    if (!result)
+    {
+        return TimelinePacketStatus::Error;
+    }
+
+    // Calculate the size of the SWTrace string label (in bytes)
+    unsigned int swTraceLabelSize = boost::numeric_cast<unsigned int>(swTraceLabel.size()) * uint32_t_size;
+
+    // Calculate the length of the data (in bytes)
+    unsigned int timelineLabelPacketDataLength = uint64_t_size +   // Profiling GUID
+                                                 swTraceLabelSize; // Label
+
+    // Calculate the timeline binary packet size (in bytes)
+    unsigned int timelineLabelPacketSize = 2 * uint32_t_size +            // Header (2 words)
+                                           timelineLabelPacketDataLength; // Profiling GUID + label
+
+    // Check whether the timeline binary packet fits in the given buffer
+    if (timelineLabelPacketSize > bufferSize)
+    {
+        return TimelinePacketStatus::BufferExhaustion;
+    }
+
+    // Packet header word 0:
+    // 26:31 [6] packet_family: timeline Packet Family, value 0b000001
+    // 19:25 [7] packet_class: packet class
+    // 16:18 [3] packet_type: packet type
+    // 8:15  [8] reserved: all zeros
+    // 0:7   [8] stream_id: stream identifier
+    uint32_t packetFamily = 1;
+    uint32_t packetClass  = 0;
+    uint32_t packetType   = 1;
+    uint32_t streamId     = 0;
+    uint32_t packetHeaderWord0 = ((packetFamily & 0x0000003F) << 26) |
+                                 ((packetClass  & 0x0000007F) << 19) |
+                                 ((packetType   & 0x00000007) << 16) |
+                                 ((streamId     & 0x00000007) <<  0);
+
+    // Packet header word 1:
+    // 25:31 [7]  reserved: all zeros
+    // 24    [1]  sequence_numbered: when non-zero the 4 bytes following the header is a u32 sequence number
+    // 0:23  [24] data_length: unsigned 24-bit integer. Length of data, in bytes. Zero is permitted
+    uint32_t sequenceNumbered = 0;
+    uint32_t dataLength       = boost::numeric_cast<uint32_t>(timelineLabelPacketDataLength); // Profiling GUID + label
+    uint32_t packetHeaderWord1 = ((sequenceNumbered & 0x00000001) << 24) |
+                                 ((dataLength       & 0x00FFFFFF) <<  0);
+
+    // Initialize the offset for writing in the buffer
+    unsigned int offset = 0;
+
+    // Write the timeline binary packet header to the buffer
+    WriteUint32(buffer, offset, packetHeaderWord0);
+    offset += uint32_t_size;
+    WriteUint32(buffer, offset, packetHeaderWord1);
+    offset += uint32_t_size;
+
+    // Write the timeline binary packet payload to the buffer
+    WriteUint64(buffer, offset, profilingGuid); // Profiling GUID
+    offset += uint64_t_size;
+    for (uint32_t swTraceLabelWord : swTraceLabel)
+    {
+        WriteUint32(buffer, offset, swTraceLabelWord); // Label
+        offset += uint32_t_size;
+    }
+
+    // Update the number of bytes written
+    numberOfBytesWritten = timelineLabelPacketSize;
+
+    return TimelinePacketStatus::Ok;
+}
+
 } // namespace profiling
 
 } // namespace armnn
-- 
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