On Wed, Jun 16 2021, Eric Farman <far...@linux.ibm.com> wrote:
> The Interrupt Response Block is comprised of several other
> structures concatenated together, but only the 12-byte
> Subchannel-Status Word (SCSW) is defined as a proper struct.
> Everything else is a simple array of 32-bit words.
>
> Let's define a proper struct for the 20-byte Extended-Status
> Word (ESW) so that we can make good decisions about the sense
> data that would go into the ECW area for virtual vs
> passthrough devices.
>
> Signed-off-by: Eric Farman <far...@linux.ibm.com>
> ---
> hw/s390x/css.c | 19 +++++++++++++------
> include/hw/s390x/ioinst.h | 12 +++++++++++-
> 2 files changed, 24 insertions(+), 7 deletions(-)
>
(...)
> diff --git a/include/hw/s390x/ioinst.h b/include/hw/s390x/ioinst.h
> index c6737a30d4..9613e0ccbb 100644
> --- a/include/hw/s390x/ioinst.h
> +++ b/include/hw/s390x/ioinst.h
> @@ -123,10 +123,20 @@ typedef struct SCHIB {
> uint8_t mda[4];
> } QEMU_PACKED SCHIB;
>
> +/* extended-status word */
> +typedef struct ESW {
> + uint32_t sublog;
> + uint32_t erw;
> + uint64_t f_addr;
> + uint32_t s_addr;
> +} QEMU_PACKED ESW;
Strictly speaking, that's a format 0 esw. Doesn't matter too much in the
end, I think:
- erw is always the same
- f_addr and s_addr are always 0 for the other formats
- 'sublog' is always a u32 with the lpum in the same place (which we
always set to 0x80 for virtual subchannels, as they have only one path)
> +
> +#define ESW_ERW_SENSE 0x01000000
> +
> /* interruption response block */
> typedef struct IRB {
> SCSW scsw;
> - uint32_t esw[5];
> + ESW esw;
> uint32_t ecw[8];
> uint32_t emw[8];
> } IRB;
