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[Qemu-devel] [PATCH v2 7/8] s390x: refactor error handling for MSCH hand
From: |
Halil Pasic |
Subject: |
[Qemu-devel] [PATCH v2 7/8] s390x: refactor error handling for MSCH handler |
Date: |
Wed, 4 Oct 2017 17:41:43 +0200 |
Simplify the error handling of the MSCH. 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 <address@hidden>
---
hw/s390x/css.c | 18 +++++-------------
include/hw/s390x/css.h | 2 +-
target/s390x/ioinst.c | 23 ++++-------------------
3 files changed, 10 insertions(+), 33 deletions(-)
diff --git a/hw/s390x/css.c b/hw/s390x/css.c
index 6da3e4ea61..98d0a6123b 100644
--- a/hw/s390x/css.c
+++ b/hw/s390x/css.c
@@ -1168,28 +1168,24 @@ static void copy_schib_from_guest(SCHIB *dest, const
SCHIB *src)
}
}
-int css_do_msch(SubchDev *sch, const SCHIB *orig_schib)
+IOInstEnding css_do_msch(SubchDev *sch, const SCHIB *orig_schib)
{
SCSW *s = &sch->curr_status.scsw;
PMCW *p = &sch->curr_status.pmcw;
uint16_t oldflags;
- int ret;
SCHIB schib;
if (!(sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_DNV)) {
- ret = 0;
- goto out;
+ return (IOInstEnding){.cc = 0};
}
if (s->ctrl & SCSW_STCTL_STATUS_PEND) {
- ret = -EINPROGRESS;
- goto out;
+ return (IOInstEnding){.cc = 1};
}
if (s->ctrl &
(SCSW_FCTL_START_FUNC|SCSW_FCTL_HALT_FUNC|SCSW_FCTL_CLEAR_FUNC)) {
- ret = -EBUSY;
- goto out;
+ return (IOInstEnding){.cc = 1};
}
copy_schib_from_guest(&schib, orig_schib);
@@ -1216,11 +1212,7 @@ int css_do_msch(SubchDev *sch, const SCHIB *orig_schib)
&& (p->flags & PMCW_FLAGS_MASK_ENA) == 0) {
sch->disable_cb(sch);
}
-
- ret = 0;
-
-out:
- return ret;
+ return (IOInstEnding){.cc = 0};
}
IOInstEnding css_do_xsch(SubchDev *sch)
diff --git a/include/hw/s390x/css.h b/include/hw/s390x/css.h
index a4064711e2..e3685e73d9 100644
--- a/include/hw/s390x/css.h
+++ b/include/hw/s390x/css.h
@@ -211,7 +211,7 @@ void css_conditional_io_interrupt(SubchDev *sch);
int css_do_stsch(SubchDev *sch, SCHIB *schib);
bool css_schid_final(int m, uint8_t cssid, uint8_t ssid, uint16_t schid);
-int css_do_msch(SubchDev *sch, const SCHIB *schib);
+IOInstEnding css_do_msch(SubchDev *sch, const SCHIB *schib);
IOInstEnding css_do_xsch(SubchDev *sch);
IOInstEnding css_do_csch(SubchDev *sch);
IOInstEnding css_do_hsch(SubchDev *sch);
diff --git a/target/s390x/ioinst.c b/target/s390x/ioinst.c
index 12102bab0f..0c256baa70 100644
--- a/target/s390x/ioinst.c
+++ b/target/s390x/ioinst.c
@@ -111,8 +111,6 @@ void ioinst_handle_msch(S390CPU *cpu, uint64_t reg1,
uint32_t ipb)
SubchDev *sch;
SCHIB schib;
uint64_t addr;
- int ret = -ENODEV;
- int cc;
CPUS390XState *env = &cpu->env;
uint8_t ar;
@@ -131,24 +129,11 @@ void ioinst_handle_msch(S390CPU *cpu, uint64_t reg1,
uint32_t ipb)
}
trace_ioinst_sch_id("msch", cssid, ssid, schid);
sch = css_find_subch(m, cssid, ssid, schid);
- if (sch && css_subch_visible(sch)) {
- ret = css_do_msch(sch, &schib);
- }
- switch (ret) {
- case -ENODEV:
- cc = 3;
- break;
- case -EBUSY:
- cc = 2;
- break;
- case 0:
- cc = 0;
- break;
- default:
- cc = 1;
- break;
+ if (!sch || !css_subch_visible(sch)) {
+ setcc(cpu, 3);
+ return;
}
- setcc(cpu, cc);
+ setcc(cpu, css_do_msch(sch, &schib).cc);
}
static void copy_orb_from_guest(ORB *dest, const ORB *src)
--
2.13.5
- Re: [Qemu-devel] [PATCH v2 2/8] s390x/css: IO instr handler ending control, (continued)