Re: [Qemu-devel] [PATCH] pci: add config space access traces

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, Aug 16, 2013 at 09:10:48PM +1000, Alexey Kardashevskiy wrote:
> This adds pci_cfg_read and pci_cfg_write traces for config spaces accesses.
> 
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>

Looks good to me.
I think it would be useful to add device and function numbers
in trace.
Could you incorporate this please?

> ---
>  hw/pci/pci_host.c | 9 ++++++++-
>  trace-events      | 4 ++++
>  2 files changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/pci/pci_host.c b/hw/pci/pci_host.c
> index 7dd9b25..f1ba5ae 100644
> --- a/hw/pci/pci_host.c
> +++ b/hw/pci/pci_host.c
> @@ -20,6 +20,7 @@
>  
>  #include "hw/pci/pci.h"
>  #include "hw/pci/pci_host.h"
> +#include "trace.h"
>  
>  /* debug PCI */
>  //#define DEBUG_PCI
> @@ -51,14 +52,20 @@ void pci_host_config_write_common(PCIDevice *pci_dev, uint32_t addr,
>                                    uint32_t limit, uint32_t val, uint32_t len)
>  {
>      assert(len <= 4);
> +    trace_pci_cfg_write(pci_dev->name, addr, val);
>      pci_dev->config_write(pci_dev, addr, val, MIN(len, limit - addr));
>  }
>  
>  uint32_t pci_host_config_read_common(PCIDevice *pci_dev, uint32_t addr,
>                                       uint32_t limit, uint32_t len)
>  {
> +    uint32_t ret;
> +
>      assert(len <= 4);
> -    return pci_dev->config_read(pci_dev, addr, MIN(len, limit - addr));
> +    ret = pci_dev->config_read(pci_dev, addr, MIN(len, limit - addr));
> +    trace_pci_cfg_read(pci_dev->name, addr, ret);
> +
> +    return ret;
>  }
>  
>  void pci_data_write(PCIBus *s, uint32_t addr, uint32_t val, int len)
> diff --git a/trace-events b/trace-events
> index 3856b5c..1f0ebf1 100644
> --- a/trace-events
> +++ b/trace-events
> @@ -1176,3 +1176,7 @@ object_class_dynamic_cast_assert(const char *type, const char *target, const cha
>  # hw/xen/xen_pvdevice.c
>  xen_pv_mmio_read(uint64_t addr) "WARNING: read from Xen PV Device MMIO space (address %"PRIx64")"
>  xen_pv_mmio_write(uint64_t addr) "WARNING: write to Xen PV Device MMIO space (address %"PRIx64")"
> +
> +# hw/pci/pci_host.c
> +pci_cfg_read(const char *dev, unsigned offs, unsigned val) "%s @0x%x 0x%x"
> +pci_cfg_write(const char *dev, unsigned offs, unsigned val) "%s @0x%x 0x%x"
> -- 
> 1.8.3.2
>