Re: [Qemu-devel] [PATCH 2/5] s390x/css: use ccw data stream

[Cornelia Huck <cohuck@redhat.com>]

On Tue,  5 Sep 2017 13:16:42 +0200
Halil Pasic <pasic@linux.vnet.ibm.com> wrote:

> 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 <pasic@linux.vnet.ibm.com>
> ---
>  hw/s390x/css.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/s390x/css.c b/hw/s390x/css.c
> index 87d913f81c..c1bc9944e6 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. */
> @@ -903,7 +904,7 @@ 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);
> +        ccw_dstream_write_buf(&sch->cds, sch->sense_data, len);
>          sch->curr_status.scsw.count = ccw.count - len;

ccw_dstream_residual_count()?

>          memset(sch->sense_data, 0, sizeof(sch->sense_data));
>          ret = 0;
> @@ -930,7 +931,7 @@ static int css_interpret_ccw(SubchDev *sch, hwaddr ccw_addr,
>          } else {
>              sense_id.reserved = 0;
>          }
> -        cpu_physical_memory_write(ccw.cda, &sense_id, len);
> +        ccw_dstream_write_buf(&sch->cds, &sense_id, len);
>          sch->curr_status.scsw.count = ccw.count - len;

dito

>          ret = 0;
>          break;