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pc-bios/s390-ccw: Move the inner logic of find_subch() to a separate function

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Move the code to a separate function to be able to re-use it from a
different spot later.

Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-Id: <20200806105349.632-5-thuth@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Thomas Huth 2020-07-28 15:50:31 +02:00
parent f3180b0266
commit d2cf4af1f4
1 changed files with 57 additions and 42 deletions
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99
pc-bios/s390-ccw/main.c
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@ -51,6 +51,60 @@ unsigned int get_loadparm_index(void)
return atoui(loadparm_str);
}
static int is_dev_possibly_bootable(int dev_no, int sch_no)
{
bool is_virtio;
Schib schib;
int r;
blk_schid.sch_no = sch_no;
r = stsch_err(blk_schid, &schib);
if (r == 3 || r == -EIO) {
return -ENODEV;
}
if (!schib.pmcw.dnv) {
return false;
}
enable_subchannel(blk_schid);
cutype = cu_type(blk_schid);
/*
* Note: we always have to run virtio_is_supported() here to make
* sure that the vdev.senseid data gets pre-initialized correctly
*/
is_virtio = virtio_is_supported(blk_schid);
/* No specific devno given, just return whether the device is possibly bootable */
if (dev_no < 0) {
switch (cutype) {
case CU_TYPE_VIRTIO:
if (is_virtio) {
/*
* Skip net devices since no IPLB is created and therefore
* no network bootloader has been loaded
*/
if (virtio_get_device_type() != VIRTIO_ID_NET) {
return true;
}
}
return false;
case CU_TYPE_DASD_3990:
case CU_TYPE_DASD_2107:
return true;
default:
return false;
}
}
/* Caller asked for a specific devno */
if (schib.pmcw.dev == dev_no) {
return true;
}
return false;
}
/*
* Find the subchannel connected to the given device (dev_no) and fill in the
* subchannel information block (schib) with the connected subchannel's info.
@ -62,53 +116,14 @@ unsigned int get_loadparm_index(void)
*/
static bool find_subch(int dev_no)
{
Schib schib;
int i, r;
bool is_virtio;
for (i = 0; i < 0x10000; i++) {
blk_schid.sch_no = i;
r = stsch_err(blk_schid, &schib);
if ((r == 3) || (r == -EIO)) {
r = is_dev_possibly_bootable(dev_no, i);
if (r < 0) {
break;
}
if (!schib.pmcw.dnv) {
continue;
}
enable_subchannel(blk_schid);
cutype = cu_type(blk_schid);
/*
* Note: we always have to run virtio_is_supported() here to make
* sure that the vdev.senseid data gets pre-initialized correctly
*/
is_virtio = virtio_is_supported(blk_schid);
/* No specific devno given, just return 1st possibly bootable device */
if (dev_no < 0) {
switch (cutype) {
case CU_TYPE_VIRTIO:
if (is_virtio) {
/*
* Skip net devices since no IPLB is created and therefore
* no network bootloader has been loaded
*/
if (virtio_get_device_type() != VIRTIO_ID_NET) {
return true;
}
}
continue;
case CU_TYPE_DASD_3990:
case CU_TYPE_DASD_2107:
return true;
default:
continue;
}
}
/* Caller asked for a specific devno */
if (schib.pmcw.dev == dev_no) {
if (r == true) {
return true;
}
}