From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50197) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dn5ym-0007I1-51 for qemu-devel@nongnu.org; Wed, 30 Aug 2017 12:36:39 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dn5yl-0006KT-20 for qemu-devel@nongnu.org; Wed, 30 Aug 2017 12:36:36 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:59972 helo=mx0a-001b2d01.pphosted.com) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dn5yk-0006K7-Rp for qemu-devel@nongnu.org; Wed, 30 Aug 2017 12:36:34 -0400 Received: from pps.filterd (m0098414.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id v7UGTAGC111723 for ; Wed, 30 Aug 2017 12:36:34 -0400 Received: from e06smtp15.uk.ibm.com (e06smtp15.uk.ibm.com [195.75.94.111]) by mx0b-001b2d01.pphosted.com with ESMTP id 2cnx1vp5qh-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Wed, 30 Aug 2017 12:36:34 -0400 Received: from localhost by e06smtp15.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 30 Aug 2017 17:36:32 +0100 From: Halil Pasic Date: Wed, 30 Aug 2017 18:36:08 +0200 In-Reply-To: <20170830163609.50260-1-pasic@linux.vnet.ibm.com> References: <20170830163609.50260-1-pasic@linux.vnet.ibm.com> Message-Id: <20170830163609.50260-9-pasic@linux.vnet.ibm.com> Subject: [Qemu-devel] [PATCH 8/9] s390x: refactor error handling for MSCH handler List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Cornelia Huck Cc: Dong Jia Shi , Pierre Morel , qemu-devel@nongnu.org, Halil Pasic Simplify the error handling of the MSCH handler avoiding arbitrary and cryptic error codes being mapped to what a subchannel is supposed to do. Let the code detecting the condition tell how it's to be handled in a less ambiguous way. Signed-off-by: Halil Pasic Reviewed-by: Pierre Morel --- hw/s390x/css.c | 20 +++++++------------- include/hw/s390x/css.h | 2 +- target/s390x/ioinst.c | 27 +++++++++------------------ 3 files changed, 17 insertions(+), 32 deletions(-) diff --git a/hw/s390x/css.c b/hw/s390x/css.c index eff1b91a8c..931a097d6a 100644 --- a/hw/s390x/css.c +++ b/hw/s390x/css.c @@ -1182,28 +1182,27 @@ static void copy_schib_from_guest(SCHIB *dest, const SCHIB *src) } } -int css_do_msch(SubchDev *sch, const SCHIB *orig_schib) +void 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; + sch->iret.cc = 0; + return; } if (s->ctrl & SCSW_STCTL_STATUS_PEND) { - ret = -EINPROGRESS; - goto out; + sch->iret.cc = 1; + return; } if (s->ctrl & (SCSW_FCTL_START_FUNC|SCSW_FCTL_HALT_FUNC|SCSW_FCTL_CLEAR_FUNC)) { - ret = -EBUSY; - goto out; + sch->iret.cc = 2; + return; } copy_schib_from_guest(&schib, orig_schib); @@ -1230,11 +1229,6 @@ 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; } void css_do_xsch(SubchDev *sch) diff --git a/include/hw/s390x/css.h b/include/hw/s390x/css.h index d8d949da4f..37ac36b014 100644 --- a/include/hw/s390x/css.h +++ b/include/hw/s390x/css.h @@ -203,7 +203,7 @@ bool css_subch_visible(SubchDev *sch); 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); +void css_do_msch(SubchDev *sch, const SCHIB *schib); void css_do_xsch(SubchDev *sch); void css_do_csch(SubchDev *sch); void css_do_hsch(SubchDev *sch); diff --git a/target/s390x/ioinst.c b/target/s390x/ioinst.c index e91788d586..a286495219 100644 --- a/target/s390x/ioinst.c +++ b/target/s390x/ioinst.c @@ -128,8 +128,6 @@ 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; @@ -148,24 +146,17 @@ 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); + if (!sch || !css_subch_visible(sch)) { + setcc(cpu, 3); + return; } - switch (ret) { - case -ENODEV: - cc = 3; - break; - case -EBUSY: - cc = 2; - break; - case 0: - cc = 0; - break; - default: - cc = 1; - break; + css_subch_clear_iret(sch); + css_do_msch(sch, &schib); + if (sch->iret.pgm_chk) { + program_interrupt(&cpu->env, sch->iret.irq_code, 4); + return; } - setcc(cpu, cc); + setcc(cpu, sch->iret.cc); } static void copy_orb_from_guest(ORB *dest, const ORB *src) -- 2.13.5