[PATCH 3/4] hw/dma: Add a trace log for a description loading failure

[Fea.Wang]

Due to a description loading failure, adding a trace log makes observing
the DMA behavior easy.

Signed-off-by: Fea.Wang <fea.wang@sifive.com>
---
 hw/dma/trace-events    | 3 +++
 hw/dma/xilinx_axidma.c | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/hw/dma/trace-events b/hw/dma/trace-events
index 3c47df54e4..95db083be4 100644
--- a/hw/dma/trace-events
+++ b/hw/dma/trace-events
@@ -44,3 +44,6 @@ pl330_debug_exec_stall(void) "stall of debug instruction not 
implemented"
 pl330_iomem_write(uint32_t offset, uint32_t value) "addr: 0x%08"PRIx32" data: 
0x%08"PRIx32
 pl330_iomem_write_clr(int i) "event interrupt lowered %d"
 pl330_iomem_read(uint32_t addr, uint32_t data) "addr: 0x%08"PRIx32" data: 
0x%08"PRIx32
+
+# xilinx_axidma.c
+xilinx_axidma_loading_desc_fail(uint32_t res) "error:%d"
diff --git a/hw/dma/xilinx_axidma.c b/hw/dma/xilinx_axidma.c
index b8ab5a423d..1bbb9d6c4c 100644
--- a/hw/dma/xilinx_axidma.c
+++ b/hw/dma/xilinx_axidma.c
@@ -36,6 +36,7 @@
 #include "sysemu/dma.h"
 #include "hw/stream.h"
 #include "qom/object.h"
+#include "trace.h"
 
 #define D(x)
 
@@ -200,6 +201,8 @@ static MemTxResult stream_desc_load(struct Stream *s, 
hwaddr addr)
                                             addr, MEMTXATTRS_UNSPECIFIED,
                                             d, sizeof *d);
     if (result != MEMTX_OK) {
+        trace_xilinx_axidma_loading_desc_fail(result);
+
         s->regs[R_DMACR] &= ~DMACR_RUNSTOP;
         s->regs[R_DMASR] |= DMASR_HALTED;
         s->regs[R_DMASR] |= DMASR_SLVERR;
-- 
2.34.1