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s390x/css: Refactor the css_queue_crw() routine 

We have a use case (vfio-ccw) where a CRW is already built and
ready to use.  Rather than teasing out the components just to
reassemble it later, let's rework this code so we can queue a
fully-qualified CRW directly.

Signed-off-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20200505125757.98209-6-farman@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Eric Farman 2020-05-05 14:57:56 +02:00 committed by Cornelia Huck
parent 690e29b911
commit f6dde1b012
2 changed files with 30 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
hw/s390x/css.c
View File

@ -2170,30 +2170,23 @@ void css_subch_assign(uint8_t cssid, uint8_t ssid, uint16_t schid,
}
}
void css_queue_crw(uint8_t rsc, uint8_t erc, int solicited,
int chain, uint16_t rsid)
void css_crw_add_to_queue(CRW crw)
{
CrwContainer *crw_cont;
trace_css_crw(rsc, erc, rsid, chain ? "(chained)" : "");
trace_css_crw((crw.flags & CRW_FLAGS_MASK_RSC) >> 8,
crw.flags & CRW_FLAGS_MASK_ERC,
crw.rsid,
(crw.flags & CRW_FLAGS_MASK_C) ? "(chained)" : "");
/* TODO: Maybe use a static crw pool? */
crw_cont = g_try_new0(CrwContainer, 1);
if (!crw_cont) {
channel_subsys.crws_lost = true;
return;
}
crw_cont->crw.flags = (rsc << 8) | erc;
if (solicited) {
crw_cont->crw.flags |= CRW_FLAGS_MASK_S;
}
if (chain) {
crw_cont->crw.flags |= CRW_FLAGS_MASK_C;
}
crw_cont->crw.rsid = rsid;
if (channel_subsys.crws_lost) {
crw_cont->crw.flags |= CRW_FLAGS_MASK_R;
channel_subsys.crws_lost = false;
}
crw_cont->crw = crw;
QTAILQ_INSERT_TAIL(&channel_subsys.pending_crws, crw_cont, sibling);
@ -2204,6 +2197,27 @@ void css_queue_crw(uint8_t rsc, uint8_t erc, int solicited,
}
}
void css_queue_crw(uint8_t rsc, uint8_t erc, int solicited,
int chain, uint16_t rsid)
{
CRW crw;
crw.flags = (rsc << 8) | erc;
if (solicited) {
crw.flags |= CRW_FLAGS_MASK_S;
}
if (chain) {
crw.flags |= CRW_FLAGS_MASK_C;
}
crw.rsid = rsid;
if (channel_subsys.crws_lost) {
crw.flags |= CRW_FLAGS_MASK_R;
channel_subsys.crws_lost = false;
}
css_crw_add_to_queue(crw);
}
void css_generate_sch_crws(uint8_t cssid, uint8_t ssid, uint16_t schid,
int hotplugged, int add)
{

1
include/hw/s390x/css.h
View File

@ -205,6 +205,7 @@ void copy_scsw_to_guest(SCSW *dest, const SCSW *src);
void css_inject_io_interrupt(SubchDev *sch);
void css_reset(void);
void css_reset_sch(SubchDev *sch);
void css_crw_add_to_queue(CRW crw);
void css_queue_crw(uint8_t rsc, uint8_t erc, int solicited,
int chain, uint16_t rsid);
void css_generate_sch_crws(uint8_t cssid, uint8_t ssid, uint16_t schid,