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s390x/css: Introduce an ESW struct 

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.

[CH: adapted ESW definition to build with mingw, as discussed]
Signed-off-by: Eric Farman <farman@linux.ibm.com>
Message-Id: <20210617232537.1337506-2-farman@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Eric Farman 2021-06-18 01:25:34 +02:00 committed by Cornelia Huck
parent 10b81272b3
commit 3fdc622ad7
2 changed files with 24 additions and 7 deletions
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19
hw/s390x/css.c
View File

@ -1335,6 +1335,14 @@ static void copy_schib_to_guest(SCHIB *dest, const SCHIB *src)
}
}
static void copy_esw_to_guest(ESW *dest, const ESW *src)
{
dest->word0 = cpu_to_be32(src->word0);
dest->erw = cpu_to_be32(src->erw);
dest->word2 = cpu_to_be64(src->word2);
dest->word4 = cpu_to_be32(src->word4);
}
IOInstEnding css_do_stsch(SubchDev *sch, SCHIB *schib)
{
int ret;
@ -1604,9 +1612,8 @@ static void copy_irb_to_guest(IRB *dest, const IRB *src, const PMCW *pmcw,
copy_scsw_to_guest(&dest->scsw, &src->scsw);
for (i = 0; i < ARRAY_SIZE(dest->esw); i++) {
dest->esw[i] = cpu_to_be32(src->esw[i]);
}
copy_esw_to_guest(&dest->esw, &src->esw);
for (i = 0; i < ARRAY_SIZE(dest->ecw); i++) {
dest->ecw[i] = cpu_to_be32(src->ecw[i]);
}
@ -1655,9 +1662,9 @@ int css_do_tsch_get_irb(SubchDev *sch, IRB *target_irb, int *irb_len)
SCSW_CSTAT_CHN_CTRL_CHK |
SCSW_CSTAT_INTF_CTRL_CHK)) {
irb.scsw.flags |= SCSW_FLAGS_MASK_ESWF;
irb.esw[0] = 0x04804000;
irb.esw.word0 = 0x04804000;
} else {
irb.esw[0] = 0x00800000;
irb.esw.word0 = 0x00800000;
}
/* If a unit check is pending, copy sense data. */
if ((schib->scsw.dstat & SCSW_DSTAT_UNIT_CHECK) &&
@ -1670,7 +1677,7 @@ int css_do_tsch_get_irb(SubchDev *sch, IRB *target_irb, int *irb_len)
for (i = 0; i < ARRAY_SIZE(irb.ecw); i++) {
irb.ecw[i] = be32_to_cpu(irb.ecw[i]);
}
irb.esw[1] = 0x01000000 | (sizeof(sch->sense_data) << 8);
irb.esw.erw = ESW_ERW_SENSE | (sizeof(sch->sense_data) << 8);
}
}
/* Store the irb to the guest. */

12
include/hw/s390x/ioinst.h
View File

@ -123,10 +123,20 @@ typedef struct SCHIB {
uint8_t mda[4];
} QEMU_PACKED SCHIB;
/* format-0 extended-status word */
typedef struct ESW {
uint32_t word0; /* subchannel logout for format 0 */
uint32_t erw;
uint64_t word2; /* failing-storage address for format 0 */
uint32_t word4; /* secondary-CCW address for format 0 */
} QEMU_PACKED ESW;
#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;