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s390x/css: Add an algorithm to find a free chpid

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This introduces a function named css_find_free_chpid() to find a
free channel path. Because virtio-ccw device used zero as its
channel path number, it would be sensible to skip the reserved one
and search upwards.

Signed-off-by: Jing Liu <liujbjl@linux.vnet.ibm.com>
Reviewed-by: QingFeng Hao <haoqf@linux.vnet.ibm.com>
Reviewed-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Jing Liu 2016-09-19 09:10:43 +02:00 • committed by Cornelia Huck
parent ae92cbd542
commit 6c15e9bfb6
2 changed files with 23 additions and 0 deletions
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21
hw/s390x/css.c
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@ -1302,6 +1302,27 @@ bool css_schid_final(int m, uint8_t cssid, uint8_t ssid, uint16_t schid)
(MAX_SCHID + 1) / sizeof(unsigned long));
}
unsigned int css_find_free_chpid(uint8_t cssid)
{
CssImage *css = channel_subsys.css[cssid];
unsigned int chpid;
if (!css) {
return MAX_CHPID + 1;
}
for (chpid = 0; chpid <= MAX_CHPID; chpid++) {
/* skip reserved chpid */
if (chpid == VIRTIO_CCW_CHPID) {
continue;
}
if (!css->chpids[chpid].in_use) {
return chpid;
}
}
return MAX_CHPID + 1;
}
static int css_add_virtual_chpid(uint8_t cssid, uint8_t chpid, uint8_t type)
{
CssImage *css;