From: Harald Freudenberger <freude@xxxxxxxxxxxxx>
This patch enables modifications of the apmask and aqmask on a live
system. Until now these both masks are read-only on a live system. The
only way to change these masks was via kernel command line parameter.
This patch makes the sysfs attributes /sys/bus/ap/apmask and
/sys/bus/ap/aqmask writeable by root. With changing the mask(s) a
revision of the existing queue to driver bindings is done. So all
APQNs which are bound to the 'wrong' driver are reprobed via kernel
function device_reprobe() and thus the new correct driver will be
assigned with respect of the changed apmask and aqmask bits.
Signed-off-by: Harald Freudenberger <freude@xxxxxxxxxxxxx>
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
---
drivers/s390/crypto/ap_bus.c | 153 ++++++++++++++++++++++++++++++++---
1 file changed, 143 insertions(+), 10 deletions(-)
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index b36a4e17a734..c47d1f2fe0d8 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -70,6 +70,7 @@ static struct ap_rights {
DECLARE_BITMAP(apm, AP_DEVICES);
DECLARE_BITMAP(aqm, AP_DOMAINS);
} ap_rights;
+static DEFINE_MUTEX(ap_rights_mutex);
static struct ap_config_info *ap_configuration;
static bool initialised;
@@ -681,6 +682,34 @@ static struct bus_type ap_bus_type = {
.pm = &ap_bus_pm_ops,
};
+static int __ap_revice_reserved(struct device *dev, void *dummy)
+{
+ int rc, card, queue, devres, drvres;
+
+ if (is_queue_dev(dev)) {
+ card = AP_QID_CARD(to_ap_queue(dev)->qid);
+ queue = AP_QID_QUEUE(to_ap_queue(dev)->qid);
+ mutex_lock(&ap_rights_mutex);
+ devres = test_bit_inv(card, ap_rights.apm)
+ && test_bit_inv(queue, ap_rights.aqm);
+ mutex_unlock(&ap_rights_mutex);
+ drvres = to_ap_drv(dev->driver)->flags
+ & AP_DRIVER_FLAG_DEFAULT;
+ if (!!devres != !!drvres) {
+ AP_DBF(DBF_DEBUG, "reprobing queue=%02x.%04x\n",
+ card, queue);
+ rc = device_reprobe(dev);
+ }
+ }
+
+ return 0;
+}
+
+static void ap_bus_revise_bindings(void)
+{
+ bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_revice_reserved);
+}
+
int ap_owned_by_def_drv(int card, int queue)
{
int rc = 0;
@@ -688,10 +717,14 @@ int ap_owned_by_def_drv(int card, int queue)
if (card < 0 || card >= AP_DEVICES || queue < 0 || queue >= AP_DOMAINS)
return -EINVAL;
+ mutex_lock(&ap_rights_mutex);
+
if (test_bit_inv(card, ap_rights.apm)
&& test_bit_inv(queue, ap_rights.aqm))
rc = 1;
+ mutex_unlock(&ap_rights_mutex);
+
return rc;
}
EXPORT_SYMBOL(ap_owned_by_def_drv);
@@ -700,6 +733,8 @@ int ap_apqn_in_matrix_owned_by_def_drv(unsigned long *apm, unsigned long *aqm)
{
int card, queue, rc = 0;
+ mutex_lock(&ap_rights_mutex);
+
for (card = 0; !rc && card < AP_DEVICES; card++)
if (test_bit_inv(card, apm) &&
test_bit_inv(card, ap_rights.apm))
@@ -708,6 +743,8 @@ int ap_apqn_in_matrix_owned_by_def_drv(unsigned long *apm, unsigned long *aqm)
test_bit_inv(queue, ap_rights.aqm))
rc = 1;
+ mutex_unlock(&ap_rights_mutex);
+
return rc;
}
EXPORT_SYMBOL(ap_apqn_in_matrix_owned_by_def_drv);
@@ -726,8 +763,10 @@ static int ap_device_probe(struct device *dev)
*/
card = AP_QID_CARD(to_ap_queue(dev)->qid);
queue = AP_QID_QUEUE(to_ap_queue(dev)->qid);
+ mutex_lock(&ap_rights_mutex);
devres = test_bit_inv(card, ap_rights.apm)
&& test_bit_inv(queue, ap_rights.aqm);
+ mutex_unlock(&ap_rights_mutex);
drvres = ap_drv->flags & AP_DRIVER_FLAG_DEFAULT;
if ((devres && !drvres) || (!devres && drvres))
return -ENODEV;
@@ -991,23 +1030,117 @@ static BUS_ATTR(ap_max_domain_id, 0444, ap_max_domain_id_show, NULL);
static ssize_t ap_apmask_show(struct bus_type *bus, char *buf)
{
- return snprintf(buf, PAGE_SIZE,
- "0x%016lx%016lx%016lx%016lx\n",
- ap_rights.apm[0], ap_rights.apm[1],
- ap_rights.apm[2], ap_rights.apm[3]);
+ int rc;
+
+ if (mutex_lock_interruptible(&ap_rights_mutex))
+ return -ERESTARTSYS;
+ rc = snprintf(buf, PAGE_SIZE,
+ "0x%016lx%016lx%016lx%016lx\n",
+ ap_rights.apm[0], ap_rights.apm[1],
+ ap_rights.apm[2], ap_rights.apm[3]);
+ mutex_unlock(&ap_rights_mutex);
+
+ return rc;
}
-static BUS_ATTR(apmask, 0444, ap_apmask_show, NULL);
+static ssize_t ap_apmask_store(struct bus_type *bus, const char *buf,
+ size_t count)
+{
+ int i;
+
+ if (*buf == '+' || *buf == '-') {
+ if (kstrtoint(buf, 0, &i))
+ return -EINVAL;
+ if (i <= -AP_DEVICES || i >= AP_DEVICES)
+ return -EINVAL;
+ if (mutex_lock_interruptible(&ap_rights_mutex))
+ return -ERESTARTSYS;
+ if (*buf == '-')
+ clear_bit_inv(-i, ap_rights.apm);
+ else
+ set_bit_inv(i, ap_rights.apm);
+ } else {
+ DECLARE_BITMAP(apm, AP_DEVICES);
+
+ i = hex2bitmap(buf, apm, AP_DEVICES);
+ if (i)
+ return i;
+ if (mutex_lock_interruptible(&ap_rights_mutex))
+ return -ERESTARTSYS;
+ for (i = 0; i < AP_DEVICES; i++)
+ if (test_bit_inv(i, apm)) {
+ if (!test_bit_inv(i, ap_rights.apm))
+ set_bit_inv(i, ap_rights.apm);
+ } else {
+ if (test_bit_inv(i, ap_rights.apm))
+ clear_bit_inv(i, ap_rights.apm);
+ }
+ }
+ mutex_unlock(&ap_rights_mutex);
+
+ ap_bus_revise_bindings();
+
+ return count;
+}
+
+static BUS_ATTR(apmask, 0644, ap_apmask_show, ap_apmask_store);
static ssize_t ap_aqmask_show(struct bus_type *bus, char *buf)
{
- return snprintf(buf, PAGE_SIZE,
- "0x%016lx%016lx%016lx%016lx\n",
- ap_rights.aqm[0], ap_rights.aqm[1],
- ap_rights.aqm[2], ap_rights.aqm[3]);
+ int rc;
+
+ if (mutex_lock_interruptible(&ap_rights_mutex))
+ return -ERESTARTSYS;
+ rc = snprintf(buf, PAGE_SIZE,
+ "0x%016lx%016lx%016lx%016lx\n",
+ ap_rights.aqm[0], ap_rights.aqm[1],
+ ap_rights.aqm[2], ap_rights.aqm[3]);
+ mutex_unlock(&ap_rights_mutex);
+
+ return rc;
}
-static BUS_ATTR(aqmask, 0444, ap_aqmask_show, NULL);
+static ssize_t ap_aqmask_store(struct bus_type *bus, const char *buf,
+ size_t count)
+{
+ int i;
+
+ if (*buf == '+' || *buf == '-') {
+ if (kstrtoint(buf, 0, &i))
+ return -EINVAL;
+ if (i <= -AP_DEVICES || i >= AP_DEVICES)
+ return -EINVAL;
+ if (mutex_lock_interruptible(&ap_rights_mutex))
+ return -ERESTARTSYS;
+ if (*buf == '-')
+ clear_bit_inv(-i, ap_rights.aqm);
+ else
+ set_bit_inv(i, ap_rights.aqm);
+ } else {
+ DECLARE_BITMAP(aqm, AP_DEVICES);
+
+ i = hex2bitmap(buf, aqm, AP_DEVICES);
+ if (i)
+ return i;
+ if (mutex_lock_interruptible(&ap_rights_mutex))
+ return -ERESTARTSYS;
+ for (i = 0; i < AP_DEVICES; i++)
+ if (test_bit_inv(i, aqm)) {
+ if (!test_bit_inv(i, ap_rights.aqm))
+ set_bit_inv(i, ap_rights.aqm);
+ } else {
+ if (test_bit_inv(i, ap_rights.aqm))
+ clear_bit_inv(i, ap_rights.aqm);
+ }
+ }
+ mutex_unlock(&ap_rights_mutex);
+
+ ap_bus_revise_bindings();
+
+ return count;
+}
+
+static BUS_ATTR(aqmask, 0644, ap_aqmask_show, ap_aqmask_store);
static struct bus_attribute *const ap_bus_attrs[] = {
&bus_attr_ap_domain,
--
2.17.0
--
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