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

[Don Slutz <dslutz@verizon.com>]

On 07/28/13 08:35, Paolo Bonzini wrote:
> 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"
> +
Sorry about the late mail.  Did you mean to have the stderr trace text 
to be the same?
    -Don Slutz
>   # 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)"