Re: [Qemu-devel] [PATCH v4 13/13] vfio: Add trace events in migration code path

[Kirti Wankhede <kwankhede@nvidia.com>]

On 6/21/2019 12:20 AM, Dr. David Alan Gilbert wrote:
> * Kirti Wankhede (kwankhede@nvidia.com) wrote:
>> Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
>> Reviewed-by: Neo Jia <cjia@nvidia.com>
> 
> Thanks, adding traces really helps; however, it might be easier
> if you just add them in your previous patches where you're
> adding the functions.
> 

Ok. I'll change it.

Thanks,
Kirti

> Dave
> 
>> ---
>>  hw/vfio/migration.c  | 26 ++++++++++++++++++++++++++
>>  hw/vfio/trace-events | 18 ++++++++++++++++++
>>  2 files changed, 44 insertions(+)
>>
>> diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
>> index 68775b5dec11..70c03f1a969f 100644
>> --- a/hw/vfio/migration.c
>> +++ b/hw/vfio/migration.c
>> @@ -21,6 +21,7 @@
>>  #include "exec/ramlist.h"
>>  #include "exec/ram_addr.h"
>>  #include "pci.h"
>> +#include "trace.h"
>>  
>>  /*
>>   * Flags used as delimiter:
>> @@ -104,6 +105,7 @@ static int vfio_migration_set_state(VFIODevice *vbasedev, uint32_t state)
>>      }
>>  
>>      vbasedev->device_state = state;
>> +    trace_vfio_migration_set_state(vbasedev->name, state);
>>      return 0;
>>  }
>>  
>> @@ -173,6 +175,8 @@ static int vfio_save_buffer(QEMUFile *f, VFIODevice *vbasedev)
>>          qemu_put_be64(f, data_size);
>>      }
>>  
>> +    trace_vfio_save_buffer(vbasedev->name, data_offset, data_size,
>> +                           migration->pending_bytes);
>>      ret = qemu_file_get_error(f);
>>  
>>      return data_size;
>> @@ -195,6 +199,7 @@ static int vfio_update_pending(VFIODevice *vbasedev)
>>      }
>>  
>>      migration->pending_bytes = pending_bytes;
>> +    trace_vfio_update_pending(vbasedev->name, pending_bytes);
>>      return 0;
>>  }
>>  
>> @@ -209,6 +214,8 @@ static int vfio_save_device_config_state(QEMUFile *f, void *opaque)
>>      }
>>      qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
>>  
>> +    trace_vfio_save_device_config_state(vbasedev->name);
>> +
>>      return qemu_file_get_error(f);
>>  }
>>  
>> @@ -225,6 +232,7 @@ static int vfio_load_device_config_state(QEMUFile *f, void *opaque)
>>          return -EINVAL;
>>      }
>>  
>> +    trace_vfio_load_device_config_state(vbasedev->name);
>>      return qemu_file_get_error(f);
>>  }
>>  
>> @@ -343,6 +351,9 @@ void vfio_get_dirty_page_list(VFIODevice *vbasedev,
>>          }
>>      } while (count < pfn_count);
>>  
>> +    trace_vfio_get_dirty_page_list(vbasedev->name, start_pfn, pfn_count,
>> +                                   page_size);
>> +
>>  dpl_unlock:
>>      qemu_mutex_unlock(&migration->lock);
>>  }
>> @@ -390,6 +401,7 @@ static int vfio_save_setup(QEMUFile *f, void *opaque)
>>          return ret;
>>      }
>>  
>> +    trace_vfio_save_setup(vbasedev->name);
>>      return 0;
>>  }
>>  
>> @@ -401,6 +413,7 @@ static void vfio_save_cleanup(void *opaque)
>>      if (migration->region.buffer.mmaps) {
>>          vfio_region_unmap(&migration->region.buffer);
>>      }
>> +    trace_vfio_cleanup(vbasedev->name);
>>  }
>>  
>>  static void vfio_save_pending(QEMUFile *f, void *opaque,
>> @@ -424,6 +437,7 @@ static void vfio_save_pending(QEMUFile *f, void *opaque,
>>          *res_postcopy_only += migration->pending_bytes;
>>      }
>>      *res_compatible += 0;
>> +    trace_vfio_save_pending(vbasedev->name);
>>  }
>>  
>>  static int vfio_save_iterate(QEMUFile *f, void *opaque)
>> @@ -451,6 +465,7 @@ static int vfio_save_iterate(QEMUFile *f, void *opaque)
>>          return ret;
>>      }
>>  
>> +    trace_vfio_save_iterate(vbasedev->name);
>>      return ret;
>>  }
>>  
>> @@ -504,6 +519,8 @@ static int vfio_save_complete_precopy(QEMUFile *f, void *opaque)
>>          error_report("Failed to set state STOPPED");
>>          return ret;
>>      }
>> +
>> +    trace_vfio_save_complete_precopy(vbasedev->name);
>>      return ret;
>>  }
>>  
>> @@ -544,6 +561,9 @@ static int vfio_load_state(QEMUFile *f, void *opaque, int version_id)
>>  
>>      data = qemu_get_be64(f);
>>      while (data != VFIO_MIG_FLAG_END_OF_STATE) {
>> +
>> +        trace_vfio_load_state(vbasedev->name, data);
>> +
>>          switch (data) {
>>          case VFIO_MIG_FLAG_DEV_CONFIG_STATE:
>>          {
>> @@ -627,6 +647,8 @@ static int vfio_load_state(QEMUFile *f, void *opaque, int version_id)
>>                      return -EINVAL;
>>                  }
>>              }
>> +            trace_vfio_load_state_device_data(vbasedev->name, data_offset,
>> +                                              data_size);
>>              break;
>>          }
>>          }
>> @@ -668,6 +690,7 @@ static void vfio_vmstate_change(void *opaque, int running, RunState state)
>>      }
>>  
>>      vbasedev->vm_running = running;
>> +    trace_vfio_vmstate_change(vbasedev->name, running);
>>  }
>>  
>>  static void vfio_migration_state_notifier(Notifier *notifier, void *data)
>> @@ -676,6 +699,8 @@ static void vfio_migration_state_notifier(Notifier *notifier, void *data)
>>      VFIODevice *vbasedev = container_of(notifier, VFIODevice, migration_state);
>>      int ret;
>>  
>> +    trace_vfio_migration_state_notifier(vbasedev->name, s->state);
>> +
>>      switch (s->state) {
>>      case MIGRATION_STATUS_ACTIVE:
>>          if (vbasedev->device_state & VFIO_DEVICE_STATE_RUNNING) {
>> @@ -758,6 +783,7 @@ int vfio_migration_probe(VFIODevice *vbasedev, Error **errp)
>>              return ret;
>>          }
>>      } else {
>> +        trace_vfio_migration_probe(vbasedev->name, info->index);
>>          return vfio_migration_init(vbasedev, info);
>>      }
>>  
>> diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events
>> index 8cdc27946cb8..b1f19ae7a806 100644
>> --- a/hw/vfio/trace-events
>> +++ b/hw/vfio/trace-events
>> @@ -143,3 +143,21 @@ vfio_display_edid_link_up(void) ""
>>  vfio_display_edid_link_down(void) ""
>>  vfio_display_edid_update(uint32_t prefx, uint32_t prefy) "%ux%u"
>>  vfio_display_edid_write_error(void) ""
>> +
>> +# migration.c
>> +vfio_migration_set_state(char *name, uint32_t state) " (%s) state %d"
>> +vfio_save_buffer(char *name, uint64_t data_offset, uint64_t data_size, uint64_t pending) " (%s), Offset 0x%"PRIx64" size 0x%"PRIx64" pending 0x%"PRIx64
>> +vfio_update_pending(char *name, uint64_t pending) " (%s), pending 0x%"PRIx64
>> +vfio_save_device_config_state(char *name) " (%s)"
>> +vfio_load_device_config_state(char *name) " (%s)"
>> +vfio_get_dirty_page_list(char *name, uint64_t start, uint64_t pfn_count, uint64_t page_size) " (%s) start 0x%"PRIx64" pfn_count 0x%"PRIx64 " page size 0x%"PRIx64
>> +vfio_save_setup(char *name) " (%s)"
>> +vfio_cleanup(char *name) " (%s)"
>> +vfio_save_pending(char *name) " (%s)"
>> +vfio_save_iterate(char *name) " (%s)"
>> +vfio_save_complete_precopy(char *name) " (%s)"
>> +vfio_load_state(char *name, uint64_t data) " (%s) data 0x%"PRIx64
>> +vfio_load_state_device_data(char *name, uint64_t data_offset, uint64_t data_size) " (%s), Offset 0x%"PRIx64" size 0x%"PRIx64
>> +vfio_vmstate_change(char *name, int running) " (%s) running %d"
>> +vfio_migration_state_notifier(char *name, int state) " (%s) state %d"
>> +vfio_migration_probe(char *name, uint32_t index) " (%s) Region %d"
>> -- 
>> 2.7.0
>>
> --
> Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
>