[Qemu-devel] [PATCH for-1.6] memory: add tracepoints for MMIO reads/writes

[Paolo Bonzini <pbonzini@redhat.com>]

This is quite handy to debug softmmu targets.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 memory.c     | 5 +++++
 trace-events | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/memory.c b/memory.c
index 1494e95..ac6f3c6 100644
--- a/memory.c
+++ b/memory.c
@@ -19,6 +19,7 @@
 #include "qemu/bitops.h"
 #include "qom/object.h"
 #include "sysemu/kvm.h"
+#include "trace.h"
 #include <assert.h>
 
 #include "exec/memory-internal.h"
@@ -388,6 +389,7 @@ static void memory_region_oldmmio_read_accessor(MemoryRegion *mr,
     uint64_t tmp;
 
     tmp = mr->ops->old_mmio.read[ctz32(size)](mr->opaque, addr);
+    trace_memory_region_ops_read(mr, addr, tmp, size);
     *value |= (tmp & mask) << shift;
 }
 
@@ -404,6 +406,7 @@ static void memory_region_read_accessor(MemoryRegion *mr,
         qemu_flush_coalesced_mmio_buffer();
     }
     tmp = mr->ops->read(mr->opaque, addr, size);
+    trace_memory_region_ops_read(mr, addr, tmp, size);
     *value |= (tmp & mask) << shift;
 }
 
@@ -417,6 +420,7 @@ static void memory_region_oldmmio_write_accessor(MemoryRegion *mr,
     uint64_t tmp;
 
     tmp = (*value >> shift) & mask;
+    trace_memory_region_ops_write(mr, addr, tmp, size);
     mr->ops->old_mmio.write[ctz32(size)](mr->opaque, addr, tmp);
 }
 
@@ -433,6 +437,7 @@ static void memory_region_write_accessor(MemoryRegion *mr,
         qemu_flush_coalesced_mmio_buffer();
     }
     tmp = (*value >> shift) & mask;
+    trace_memory_region_ops_write(mr, addr, tmp, size);
     mr->ops->write(mr->opaque, addr, tmp, size);
 }
 
diff --git a/trace-events b/trace-events
index 002df83..3e0dd74 100644
--- a/trace-events
+++ b/trace-events
@@ -1165,6 +1165,10 @@ kvm_vm_ioctl(int type, void *arg) "type %d, arg %p"
 kvm_vcpu_ioctl(int cpu_index, int type, void *arg) "cpu_index %d, type %d, arg %p"
 kvm_run_exit(int cpu_index, uint32_t reason) "cpu_index %d, reason %d"
 
+# memory.c
+memory_region_ops_read(void *mr, uint64_t addr, uint64_t value, unsigned size) "mr %p addr %#"PRIx64" value %#"PRIx64" size %d"
+memory_region_ops_write(void *mr, uint64_t addr, uint64_t value, unsigned size) "mr %p addr %#"PRIx64" value %#"PRIx64" size %d"
+
 # qom/object.c
 object_dynamic_cast_assert(const char *type, const char *target, const char *file, int line, const char *func) "%s->%s (%s:%d:%s)"
 object_class_dynamic_cast_assert(const char *type, const char *target, const char *file, int line, const char *func) "%s->%s (%s:%d:%s)"
-- 
1.8.1.4