Re: [PATCH v2 1/9] pc-bios: s390x: cio.c cleanup and compile fix

[David Hildenbrand <david@redhat.com>]

On 14.05.20 14:37, Janosch Frank wrote:
> Let's initialize the structs at the beginning to ease reading and also
> zeroing all other fields. This also makes the compiler stop
> compalining about sense_id_ccw.flags being ored into when it's not

s/compalining/complaining/

> initialized.
> 
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
>  pc-bios/s390-ccw/cio.c | 36 ++++++++++++++++++------------------
>  1 file changed, 18 insertions(+), 18 deletions(-)
> 
> diff --git a/pc-bios/s390-ccw/cio.c b/pc-bios/s390-ccw/cio.c
> index 339ec5fbe7..63301ebb58 100644
> --- a/pc-bios/s390-ccw/cio.c
> +++ b/pc-bios/s390-ccw/cio.c
> @@ -49,13 +49,13 @@ void enable_subchannel(SubChannelId schid)
>  
>  uint16_t cu_type(SubChannelId schid)
>  {
> -    Ccw1 sense_id_ccw;
>      SenseId sense_data;
> -
> -    sense_id_ccw.cmd_code = CCW_CMD_SENSE_ID;
> -    sense_id_ccw.cda = ptr2u32(&sense_data);
> -    sense_id_ccw.count = sizeof(sense_data);
> -    sense_id_ccw.flags |= CCW_FLAG_SLI;
> +    Ccw1 sense_id_ccw = {
> +        .cmd_code = CCW_CMD_SENSE_ID,
> +        .count = sizeof(sense_data),
> +        .flags = CCW_FLAG_SLI,
> +        .cda = ptr2u32(&sense_data),
> +    };
>  
>      if (do_cio(schid, CU_TYPE_UNKNOWN, ptr2u32(&sense_id_ccw), CCW_FMT1)) {
>          panic("Failed to run SenseID CCw\n");
> @@ -67,13 +67,13 @@ uint16_t cu_type(SubChannelId schid)
>  int basic_sense(SubChannelId schid, uint16_t cutype, void *sense_data,
>                   uint16_t data_size)
>  {
> -    Ccw1 senseCcw;
> +    Ccw1 senseCcw = {
> +        .cmd_code = CCW_CMD_BASIC_SENSE,
> +        .count = data_size,
> +        .cda = ptr2u32(sense_data),
> +    };
>      Irb irb;
>  
> -    senseCcw.cmd_code = CCW_CMD_BASIC_SENSE;
> -    senseCcw.cda = ptr2u32(sense_data);
> -    senseCcw.count = data_size;
> -
>      return __do_cio(schid, ptr2u32(&senseCcw), CCW_FMT1, &irb);
>  }
>  
> @@ -314,7 +314,13 @@ static void print_irb_err(Irb *irb)
>   */
>  static int __do_cio(SubChannelId schid, uint32_t ccw_addr, int fmt, Irb *irb)
>  {
> -    CmdOrb orb = {};
> +    CmdOrb orb = {
> +        .fmt = fmt,
> +        .pfch = 1,	/* QEMU's cio implementation requires prefetch */
> +        .c64 = 1,	/* QEMU's cio implementation requires 64-bit idaws */

Maybe just document this on top (all comments combined)

/*
 * QEMU's CIO implementation requires prefetch and 64-bit idaws. We
 * allow all paths.
 */

Or get rid of the tabs ;)

Reviewed-by: David Hildenbrand <david@redhat.com>

-- 
Thanks,

David / dhildenb