[S390] pm: iucv power management callbacks.
Patch calls the PM callback functions of iucv-bus devices, which are responsible for removal of their established iucv pathes. The PM freeze callback for the first iucv-bus device disables all iucv interrupts except the connection severed interrupt. The PM freeze callback for the last iucv-bus device shuts down iucv. The PM thaw callback for the first iucv-bus device re-enables iucv if it has been shut down during freeze. If freezing has been interrupted, it re-enables iucv interrupts according to the needs of iucv-exploiters. The PM restore callback for the first iucv-bus device re-enables iucv. Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Ursula Braun
Martin Schwidefsky
parent
6c005961c1
commit
672e405b60
179
net/iucv/iucv.c
179
net/iucv/iucv.c
|
|
@ -11,6 +11,8 @@
|
|||
* Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
|
||||
* Rewritten for af_iucv:
|
||||
* Martin Schwidefsky <schwidefsky@de.ibm.com>
|
||||
* PM functions:
|
||||
* Ursula Braun (ursula.braun@de.ibm.com)
|
||||
*
|
||||
* Documentation used:
|
||||
* The original source
|
||||
|
|
@ -77,9 +79,24 @@ static int iucv_bus_match(struct device *dev, struct device_driver *drv)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static int iucv_pm_prepare(struct device *);
|
||||
static void iucv_pm_complete(struct device *);
|
||||
static int iucv_pm_freeze(struct device *);
|
||||
static int iucv_pm_thaw(struct device *);
|
||||
static int iucv_pm_restore(struct device *);
|
||||
|
||||
static struct dev_pm_ops iucv_pm_ops = {
|
||||
.prepare = iucv_pm_prepare,
|
||||
.complete = iucv_pm_complete,
|
||||
.freeze = iucv_pm_freeze,
|
||||
.thaw = iucv_pm_thaw,
|
||||
.restore = iucv_pm_restore,
|
||||
};
|
||||
|
||||
struct bus_type iucv_bus = {
|
||||
.name = "iucv",
|
||||
.match = iucv_bus_match,
|
||||
.pm = &iucv_pm_ops,
|
||||
};
|
||||
EXPORT_SYMBOL(iucv_bus);
|
||||
|
||||
|
|
@ -149,6 +166,7 @@ enum iucv_command_codes {
|
|||
IUCV_RESUME = 14,
|
||||
IUCV_SEVER = 15,
|
||||
IUCV_SETMASK = 16,
|
||||
IUCV_SETCONTROLMASK = 17,
|
||||
};
|
||||
|
||||
/*
|
||||
|
|
@ -366,6 +384,18 @@ static void iucv_allow_cpu(void *data)
|
|||
parm->set_mask.ipmask = 0xf8;
|
||||
iucv_call_b2f0(IUCV_SETMASK, parm);
|
||||
|
||||
/*
|
||||
* Enable all iucv control interrupts.
|
||||
* ipmask contains bits for the different interrupts
|
||||
* 0x80 - Flag to allow pending connections interrupts
|
||||
* 0x40 - Flag to allow connection complete interrupts
|
||||
* 0x20 - Flag to allow connection severed interrupts
|
||||
* 0x10 - Flag to allow connection quiesced interrupts
|
||||
* 0x08 - Flag to allow connection resumed interrupts
|
||||
*/
|
||||
memset(parm, 0, sizeof(union iucv_param));
|
||||
parm->set_mask.ipmask = 0xf8;
|
||||
iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
|
||||
/* Set indication that iucv interrupts are allowed for this cpu. */
|
||||
cpu_set(cpu, iucv_irq_cpumask);
|
||||
}
|
||||
|
|
@ -390,6 +420,31 @@ static void iucv_block_cpu(void *data)
|
|||
cpu_clear(cpu, iucv_irq_cpumask);
|
||||
}
|
||||
|
||||
/**
|
||||
* iucv_block_cpu_almost
|
||||
* @data: unused
|
||||
*
|
||||
* Allow connection-severed interrupts only on this cpu.
|
||||
*/
|
||||
static void iucv_block_cpu_almost(void *data)
|
||||
{
|
||||
int cpu = smp_processor_id();
|
||||
union iucv_param *parm;
|
||||
|
||||
/* Allow iucv control interrupts only */
|
||||
parm = iucv_param_irq[cpu];
|
||||
memset(parm, 0, sizeof(union iucv_param));
|
||||
parm->set_mask.ipmask = 0x08;
|
||||
iucv_call_b2f0(IUCV_SETMASK, parm);
|
||||
/* Allow iucv-severed interrupt only */
|
||||
memset(parm, 0, sizeof(union iucv_param));
|
||||
parm->set_mask.ipmask = 0x20;
|
||||
iucv_call_b2f0(IUCV_SETCONTROLMASK, parm);
|
||||
|
||||
/* Clear indication that iucv interrupts are allowed for this cpu. */
|
||||
cpu_clear(cpu, iucv_irq_cpumask);
|
||||
}
|
||||
|
||||
/**
|
||||
* iucv_declare_cpu
|
||||
* @data: unused
|
||||
|
|
@ -1766,6 +1821,130 @@ static void iucv_external_interrupt(u16 code)
|
|||
spin_unlock(&iucv_queue_lock);
|
||||
}
|
||||
|
||||
static int iucv_pm_prepare(struct device *dev)
|
||||
{
|
||||
int rc = 0;
|
||||
|
||||
#ifdef CONFIG_PM_DEBUG
|
||||
printk(KERN_INFO "iucv_pm_prepare\n");
|
||||
#endif
|
||||
if (dev->driver && dev->driver->pm && dev->driver->pm->prepare)
|
||||
rc = dev->driver->pm->prepare(dev);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static void iucv_pm_complete(struct device *dev)
|
||||
{
|
||||
#ifdef CONFIG_PM_DEBUG
|
||||
printk(KERN_INFO "iucv_pm_complete\n");
|
||||
#endif
|
||||
if (dev->driver && dev->driver->pm && dev->driver->pm->complete)
|
||||
dev->driver->pm->complete(dev);
|
||||
}
|
||||
|
||||
/**
|
||||
* iucv_path_table_empty() - determine if iucv path table is empty
|
||||
*
|
||||
* Returns 0 if there are still iucv pathes defined
|
||||
* 1 if there are no iucv pathes defined
|
||||
*/
|
||||
int iucv_path_table_empty(void)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < iucv_max_pathid; i++) {
|
||||
if (iucv_path_table[i])
|
||||
return 0;
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
/**
|
||||
* iucv_pm_freeze() - Freeze PM callback
|
||||
* @dev: iucv-based device
|
||||
*
|
||||
* disable iucv interrupts
|
||||
* invoke callback function of the iucv-based driver
|
||||
* shut down iucv, if no iucv-pathes are established anymore
|
||||
*/
|
||||
static int iucv_pm_freeze(struct device *dev)
|
||||
{
|
||||
int cpu;
|
||||
int rc = 0;
|
||||
|
||||
#ifdef CONFIG_PM_DEBUG
|
||||
printk(KERN_WARNING "iucv_pm_freeze\n");
|
||||
#endif
|
||||
for_each_cpu_mask_nr(cpu, iucv_irq_cpumask)
|
||||
smp_call_function_single(cpu, iucv_block_cpu_almost, NULL, 1);
|
||||
if (dev->driver && dev->driver->pm && dev->driver->pm->freeze)
|
||||
rc = dev->driver->pm->freeze(dev);
|
||||
if (iucv_path_table_empty())
|
||||
iucv_disable();
|
||||
return rc;
|
||||
}
|
||||
|
||||
/**
|
||||
* iucv_pm_thaw() - Thaw PM callback
|
||||
* @dev: iucv-based device
|
||||
*
|
||||
* make iucv ready for use again: allocate path table, declare interrupt buffers
|
||||
* and enable iucv interrupts
|
||||
* invoke callback function of the iucv-based driver
|
||||
*/
|
||||
static int iucv_pm_thaw(struct device *dev)
|
||||
{
|
||||
int rc = 0;
|
||||
|
||||
#ifdef CONFIG_PM_DEBUG
|
||||
printk(KERN_WARNING "iucv_pm_thaw\n");
|
||||
#endif
|
||||
if (!iucv_path_table) {
|
||||
rc = iucv_enable();
|
||||
if (rc)
|
||||
goto out;
|
||||
}
|
||||
if (cpus_empty(iucv_irq_cpumask)) {
|
||||
if (iucv_nonsmp_handler)
|
||||
/* enable interrupts on one cpu */
|
||||
iucv_allow_cpu(NULL);
|
||||
else
|
||||
/* enable interrupts on all cpus */
|
||||
iucv_setmask_mp();
|
||||
}
|
||||
if (dev->driver && dev->driver->pm && dev->driver->pm->thaw)
|
||||
rc = dev->driver->pm->thaw(dev);
|
||||
out:
|
||||
return rc;
|
||||
}
|
||||
|
||||
/**
|
||||
* iucv_pm_restore() - Restore PM callback
|
||||
* @dev: iucv-based device
|
||||
*
|
||||
* make iucv ready for use again: allocate path table, declare interrupt buffers
|
||||
* and enable iucv interrupts
|
||||
* invoke callback function of the iucv-based driver
|
||||
*/
|
||||
static int iucv_pm_restore(struct device *dev)
|
||||
{
|
||||
int rc = 0;
|
||||
|
||||
#ifdef CONFIG_PM_DEBUG
|
||||
printk(KERN_WARNING "iucv_pm_restore %p\n", iucv_path_table);
|
||||
#endif
|
||||
if (cpus_empty(iucv_irq_cpumask)) {
|
||||
rc = iucv_query_maxconn();
|
||||
rc = iucv_enable();
|
||||
if (rc)
|
||||
goto out;
|
||||
}
|
||||
if (dev->driver && dev->driver->pm && dev->driver->pm->restore)
|
||||
rc = dev->driver->pm->restore(dev);
|
||||
out:
|
||||
return rc;
|
||||
}
|
||||
|
||||
/**
|
||||
* iucv_init
|
||||
*
|
||||
|
|
|
|||
Loading…
Reference in New Issue