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pc-bios/s390-ccw: Device detection in higher subchannel sets

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If no bootdevice was specified, we try to autodetect a suitable IPL
device. Current code only searched in subchannel set 0; extend this
search to higher subchannel sets as well.

Signed-off-by: Alexander Yarygin <yarygin@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Alexander Yarygin 2015-06-25 18:35:58 +03:00 committed by Cornelia Huck
parent f7822aa8b6
commit 0f79b89bc2
1 changed files with 44 additions and 28 deletions
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72
pc-bios/s390-ccw/main.c
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@ -38,40 +38,56 @@ void virtio_panic(const char *string)
while (1) { }
}
static void virtio_setup(uint64_t dev_info)
static bool find_dev(struct schib *schib, int dev_no)
{
struct schib schib;
int i;
int r;
bool found = false;
bool check_devno = false;
uint16_t dev_no = -1;
if (dev_info != -1) {
check_devno = true;
dev_no = dev_info & 0xffff;
debug_print_int("device no. ", dev_no);
blk_schid.ssid = (dev_info >> 16) & 0x3;
if (blk_schid.ssid != 0) {
debug_print_int("ssid ", blk_schid.ssid);
if (enable_mss_facility() != 0) {
virtio_panic("Failed to enable mss facility\n");
}
}
}
int i, r;
for (i = 0; i < 0x10000; i++) {
blk_schid.sch_no = i;
r = stsch_err(blk_schid, &schib);
if (r == 3) {
r = stsch_err(blk_schid, schib);
if ((r == 3) || (r == -EIO)) {
break;
}
if (schib.pmcw.dnv) {
if (!check_devno || (schib.pmcw.dev == dev_no)) {
if (virtio_is_blk(blk_schid)) {
found = true;
break;
}
if (!schib->pmcw.dnv) {
continue;
}
if (!virtio_is_blk(blk_schid)) {
continue;
}
if ((dev_no < 0) || (schib->pmcw.dev == dev_no)) {
return true;
}
}
return false;
}
static void virtio_setup(uint64_t dev_info)
{
struct schib schib;
int ssid;
bool found = false;
uint16_t dev_no;
/*
* We unconditionally enable mss support. In every sane configuration,
* this will succeed; and even if it doesn't, stsch_err() can deal
* with the consequences.
*/
enable_mss_facility();
if (dev_info != -1) {
dev_no = dev_info & 0xffff;
debug_print_int("device no. ", dev_no);
blk_schid.ssid = (dev_info >> 16) & 0x3;
debug_print_int("ssid ", blk_schid.ssid);
found = find_dev(&schib, dev_no);
} else {
for (ssid = 0; ssid < 0x3; ssid++) {
blk_schid.ssid = ssid;
found = find_dev(&schib, -1);
if (found) {
break;
}
}
}