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s390/ipl: add support to control memory clearing for nvme re-IPL 

Re-IPL for nvme is currently done by using diag 308 with the "Load Clear"
subcode, which means that all memory will be cleared.
This can increase re-IPL duration considerably on very large machines.

For list-directed IPL like nvme or fcp IPL, a "Load Normal" subcode was
introduced with z14. The "Load Normal" diag 308 subcode allows to re-IPL
without clearing memory.

This patch adds a new "clear" sysfs attribute to /sys/firmware/reipl/nvme,
which can be set to either "0" or "1" to disable or enable re-IPL with
memory clearing. The default value is "0", which disables memory clearing.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Tested-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Gerald Schaefer 2020-06-23 19:10:08 +02:00 committed by Vasily Gorbik
parent bd37b36832
commit 5627b9224b
1 changed files with 42 additions and 6 deletions
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48
arch/s390/kernel/ipl.c
View File

@ -156,6 +156,7 @@ static struct ipl_parameter_block *dump_block_ccw;
static struct sclp_ipl_info sclp_ipl_info;
static bool reipl_nvme_clear;
static bool reipl_fcp_clear;
static bool reipl_ccw_clear;
@ -886,6 +887,24 @@ static struct attribute_group reipl_nvme_attr_group = {
.bin_attrs = reipl_nvme_bin_attrs
};
static ssize_t reipl_nvme_clear_show(struct kobject *kobj,
struct kobj_attribute *attr, char *page)
{
return sprintf(page, "%u\n", reipl_nvme_clear);
}
static ssize_t reipl_nvme_clear_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t len)
{
if (strtobool(buf, &reipl_nvme_clear) < 0)
return -EINVAL;
return len;
}
static struct kobj_attribute sys_reipl_nvme_clear_attr =
__ATTR(clear, 0644, reipl_nvme_clear_show, reipl_nvme_clear_store);
/* CCW reipl device attributes */
DEFINE_IPL_CCW_ATTR_RW(reipl_ccw, device, reipl_block_ccw->ccw);
@ -1112,7 +1131,10 @@ static void __reipl_run(void *unused)
break;
case IPL_TYPE_NVME:
diag308(DIAG308_SET, reipl_block_nvme);
diag308(DIAG308_LOAD_CLEAR, NULL);
if (reipl_nvme_clear)
diag308(DIAG308_LOAD_CLEAR, NULL);
else
diag308(DIAG308_LOAD_NORMAL, NULL);
break;
case IPL_TYPE_NSS:
diag308(DIAG308_SET, reipl_block_nss);
@ -1233,8 +1255,9 @@ static int __init reipl_fcp_init(void)
&sys_reipl_fcp_clear_attr.attr);
if (rc)
goto out2;
} else
} else {
reipl_fcp_clear = true;
}
if (ipl_info.type == IPL_TYPE_FCP) {
memcpy(reipl_block_fcp, &ipl_block, sizeof(ipl_block));
@ -1280,10 +1303,16 @@ static int __init reipl_nvme_init(void)
}
rc = sysfs_create_group(&reipl_nvme_kset->kobj, &reipl_nvme_attr_group);
if (rc) {
kset_unregister(reipl_nvme_kset);
free_page((unsigned long) reipl_block_nvme);
return rc;
if (rc)
goto out1;
if (test_facility(141)) {
rc = sysfs_create_file(&reipl_nvme_kset->kobj,
&sys_reipl_nvme_clear_attr.attr);
if (rc)
goto out2;
} else {
reipl_nvme_clear = true;
}
if (ipl_info.type == IPL_TYPE_NVME) {
@ -1304,6 +1333,13 @@ static int __init reipl_nvme_init(void)
}
reipl_capabilities |= IPL_TYPE_NVME;
return 0;
out2:
sysfs_remove_group(&reipl_nvme_kset->kobj, &reipl_nvme_attr_group);
out1:
kset_unregister(reipl_nvme_kset);
free_page((unsigned long) reipl_block_nvme);
return rc;
}
static int __init reipl_type_init(void)