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s390x: refactor error handling for CSCH handler

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Simplify the error handling of the CSCH.  Let the code detecting the
condition tell (in a less ambiguous way) how it's to be handled. No
changes in behavior.

Signed-off-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Message-Id: <20171017140453.51099-6-pasic@linux.vnet.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Halil Pasic 2017-10-17 16:04:51 +02:00 committed by Cornelia Huck
parent 963764081d
commit 773314426e
3 changed files with 8 additions and 20 deletions
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12
hw/s390x/css.c
View File

@ -1435,26 +1435,20 @@ IOInstEnding css_do_xsch(SubchDev *sch)
return IOINST_CC_EXPECTED; return IOINST_CC_EXPECTED;
} }
int css_do_csch(SubchDev *sch) IOInstEnding css_do_csch(SubchDev *sch)
{ {
SCSW *s = &sch->curr_status.scsw; SCSW *s = &sch->curr_status.scsw;
PMCW *p = &sch->curr_status.pmcw; PMCW *p = &sch->curr_status.pmcw;
int ret;
if (~(p->flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) { if (~(p->flags) & (PMCW_FLAGS_MASK_DNV | PMCW_FLAGS_MASK_ENA)) {
ret = -ENODEV; return IOINST_CC_NOT_OPERATIONAL;
goto out;
} }
/* Trigger the clear function. */ /* Trigger the clear function. */
s->ctrl &= ~(SCSW_CTRL_MASK_FCTL | SCSW_CTRL_MASK_ACTL); s->ctrl &= ~(SCSW_CTRL_MASK_FCTL | SCSW_CTRL_MASK_ACTL);
s->ctrl |= SCSW_FCTL_CLEAR_FUNC | SCSW_ACTL_CLEAR_PEND; s->ctrl |= SCSW_FCTL_CLEAR_FUNC | SCSW_ACTL_CLEAR_PEND;
do_subchannel_work(sch); return do_subchannel_work(sch);
ret = 0;
out:
return ret;
} }
int css_do_hsch(SubchDev *sch) int css_do_hsch(SubchDev *sch)

2
include/hw/s390x/css.h
View File

@ -241,7 +241,7 @@ int css_do_stsch(SubchDev *sch, SCHIB *schib);
bool css_schid_final(int m, uint8_t cssid, uint8_t ssid, uint16_t schid); bool css_schid_final(int m, uint8_t cssid, uint8_t ssid, uint16_t schid);
int css_do_msch(SubchDev *sch, const SCHIB *schib); int css_do_msch(SubchDev *sch, const SCHIB *schib);
IOInstEnding css_do_xsch(SubchDev *sch); IOInstEnding css_do_xsch(SubchDev *sch);
int css_do_csch(SubchDev *sch); IOInstEnding css_do_csch(SubchDev *sch);
int css_do_hsch(SubchDev *sch); int css_do_hsch(SubchDev *sch);
IOInstEnding css_do_ssch(SubchDev *sch, ORB *orb); IOInstEnding css_do_ssch(SubchDev *sch, ORB *orb);
int css_do_tsch_get_irb(SubchDev *sch, IRB *irb, int *irb_len); int css_do_tsch_get_irb(SubchDev *sch, IRB *irb, int *irb_len);

14
target/s390x/ioinst.c
View File

@ -60,8 +60,6 @@ void ioinst_handle_csch(S390CPU *cpu, uint64_t reg1)
{ {
int cssid, ssid, schid, m; int cssid, ssid, schid, m;
SubchDev *sch; SubchDev *sch;
int ret = -ENODEV;
int cc;
if (ioinst_disassemble_sch_ident(reg1, &m, &cssid, &ssid, &schid)) { if (ioinst_disassemble_sch_ident(reg1, &m, &cssid, &ssid, &schid)) {
program_interrupt(&cpu->env, PGM_OPERAND, 4); program_interrupt(&cpu->env, PGM_OPERAND, 4);
@ -69,15 +67,11 @@ void ioinst_handle_csch(S390CPU *cpu, uint64_t reg1)
} }
trace_ioinst_sch_id("csch", cssid, ssid, schid); trace_ioinst_sch_id("csch", cssid, ssid, schid);
sch = css_find_subch(m, cssid, ssid, schid); sch = css_find_subch(m, cssid, ssid, schid);
if (sch && css_subch_visible(sch)) { if (!sch || !css_subch_visible(sch)) {
ret = css_do_csch(sch); setcc(cpu, 3);
return;
} }
if (ret == -ENODEV) { setcc(cpu, css_do_csch(sch));
cc = 3;
} else {
cc = 0;
}
setcc(cpu, cc);
} }
void ioinst_handle_hsch(S390CPU *cpu, uint64_t reg1) void ioinst_handle_hsch(S390CPU *cpu, uint64_t reg1)