Re: [Qemu-devel] [PATCH v2 2/4] s390x/css: use ccw data stream

[Dong Jia Shi]

* Halil Pasic <address@hidden> [2017-09-13 13:50:27 +0200]:

> Replace direct access which implicitly assumes no IDA
> or MIDA with the new ccw data stream interface which should
> cope with these transparently in the future.
> 
> Signed-off-by: Halil Pasic <address@hidden>
> ---
>  hw/s390x/css.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/s390x/css.c b/hw/s390x/css.c
> index e8d2016563..6b0cd8861b 100644
> --- a/hw/s390x/css.c
> +++ b/hw/s390x/css.c
> @@ -890,6 +890,7 @@ static int css_interpret_ccw(SubchDev *sch, hwaddr 
> ccw_addr,
>      }
> 
>      /* Look at the command. */
> +    ccw_dstream_init(&sch->cds, &ccw, &(sch->orb));
>      switch (ccw.cmd_code) {
>      case CCW_CMD_NOOP:
>          /* Nothing to do. */
> @@ -903,8 +904,8 @@ static int css_interpret_ccw(SubchDev *sch, hwaddr 
> ccw_addr,
>              }
>          }
>          len = MIN(ccw.count, sizeof(sch->sense_data));
> -        cpu_physical_memory_write(ccw.cda, sch->sense_data, len);
> -        sch->curr_status.scsw.count = ccw.count - len;
> +        ccw_dstream_write_buf(&sch->cds, sch->sense_data, len);
> +        sch->curr_status.scsw.count = ccw_dstream_residual_count(&sch->cds);
>          memset(sch->sense_data, 0, sizeof(sch->sense_data));
>          ret = 0;
>          break;
> @@ -930,8 +931,8 @@ static int css_interpret_ccw(SubchDev *sch, hwaddr 
> ccw_addr,
>          } else {
>              sense_id.reserved = 0;
>          }
> -        cpu_physical_memory_write(ccw.cda, &sense_id, len);
> -        sch->curr_status.scsw.count = ccw.count - len;
> +        ccw_dstream_write_buf(&sch->cds, &sense_id, len);
> +        sch->curr_status.scsw.count = ccw_dstream_residual_count(&sch->cds);
>          ret = 0;
>          break;
>      }
> -- 
> 2.13.5
> 

Reviewed-by: Dong Jia Shi <address@hidden>

-- 
Dong Jia Shi