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zdev: add support for autoquiesce related sysfs attributes

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Autoquiesce is a mechanism that tells Linux to stop issuing I/Os to a
specific DASD after certain events.

Add support for configuring related DASD device attributes
that govern the following aspects of autoquiesce:

aq_mask - Configure which events lead to autoquiesce.
aq_requeue - Configure if autoquiesce will requeue all I/O to blocklayer.
aq_timeouts - Configure the number of timeouts before autoquiesce.

Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
This commit is contained in:
Stefan Haberland
2023-05-08 14:52:54 +02:00
committed by Jan Höppner
parent 3287bb9613
commit 493af760ed
1 changed files with 65 additions and 0 deletions
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65
zdev/src/dasd.c
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@@ -344,6 +344,68 @@ static struct attrib dasd_attr_fc_security = {
.readonly = 1,
};
static struct attrib dasd_attr_aq_mask = {
.name = "aq_mask",
.title = "Specify autoquiesce triggers",
.desc =
"Use the aq_mask attribute to automatically quiesce a device and block\n"
"new I/O after certain events.\n"
"\n"
"The value is a bitmask in decimal or hexadecimal format where each set bit\n"
"indicates that the associated event shown in the table below triggers an\n"
"autoquiesce.\n"
" Bit 0 is not used.\n"
" 1 - 0x02 - A terminal I/O error occurred\n"
" 2 - 0x04 - No active channel paths remain for the device\n"
" 3 - 0x08 - A state change interrupt occurred\n"
" 4 - 0x10 - The device is PPRC suspended\n"
" 5 - 0x20 - No space is left on an ESE device\n"
" 6 - 0x40 – The number of timeouts specified in aq_timeouts is reached\n"
" 7 - 0x80 - I/O was not started because of an error in the start function\n"
"\n"
"For example bits 1,3 and 5 set (0010 1010) lead to an integer value of 42\n"
"or 0x2A.\n"
"An integer value of 0 turns off the autoquiesce function.\n",
.order_cmp = ccw_online_only_order_cmp,
.check = ccw_online_only_check,
.defval = "0",
/*
* Currently only 8 bits are defined and the max value is 255.
* This needs to be adjusted if more bits are defined.
*/
.accept = ACCEPT_ARRAY(ACCEPT_RANGE(0, 255)),
};
static struct attrib dasd_attr_aq_requeue = {
.name = "aq_requeue",
.title = "Control I/O requeing during autoquiesce",
.desc =
"Use the aq_requeue attribute to control whether outstanding I/O\n"
"operations to the blocklayer should be automatically requeued after\n"
"an autoquiesce event.\n"
"Valid values are 1 for requeuing, or 0 for no requeueing.\n"
"Requeing the I/O requests to the blocklayer might benefit I/O\n"
"in case of a copy_pair swap operation.\n",
.order_cmp = ccw_online_only_order_cmp,
.check = ccw_online_only_check,
.defval = "0",
.accept = ACCEPT_ARRAY(ACCEPT_RANGE(0, 1)),
};
static struct attrib dasd_attr_aq_timeouts = {
.name = "aq_timeouts",
.title = "Specify timeout retry threshold",
.desc =
"Specify the number of sequential timeout events for an I/O operation\n"
"before an autoquiesce is triggered on a device.\n"
"This requires that the corresponding trigger bit 6 is set\n"
"in the aq_mask attribute.\n",
.order_cmp = ccw_online_only_order_cmp,
.check = ccw_online_only_check,
.defval = "32768",
.accept = ACCEPT_ARRAY(ACCEPT_RANGE(0, 32768)),
};
/*
* DASD subtype methods.
*/
@@ -725,6 +787,9 @@ struct subtype dasd_subtype_eckd = {
&dasd_attr_safe_offline,
&dasd_attr_fc_security,
&dasd_attr_copy_pair,
&dasd_attr_aq_mask,
&dasd_attr_aq_requeue,
&dasd_attr_aq_timeouts,
&internal_attr_early,
),
.unknown_dev_attribs = 1,