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path: root/drivers/s390/crypto/ap_bus.c
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Diffstat (limited to 'drivers/s390/crypto/ap_bus.c')
-rw-r--r--drivers/s390/crypto/ap_bus.c288
1 files changed, 284 insertions, 4 deletions
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index bf720ae74d61..30d7898910ea 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -34,6 +34,7 @@
#include <linux/crypto.h>
#include <linux/mod_devicetable.h>
#include <linux/debugfs.h>
+#include <linux/ctype.h>
#include "ap_bus.h"
#include "ap_debug.h"
@@ -51,11 +52,26 @@ static int ap_thread_flag;
module_param_named(poll_thread, ap_thread_flag, int, 0440);
MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off).");
+static char *apm_str;
+module_param_named(apmask, apm_str, charp, 0440);
+MODULE_PARM_DESC(apmask, "AP bus adapter mask.");
+
+static char *aqm_str;
+module_param_named(aqmask, aqm_str, charp, 0440);
+MODULE_PARM_DESC(aqmask, "AP bus domain mask.");
+
static struct device *ap_root_device;
DEFINE_SPINLOCK(ap_list_lock);
LIST_HEAD(ap_card_list);
+/* Default permissions (card and domain masking) */
+static struct ap_perms {
+ DECLARE_BITMAP(apm, AP_DEVICES);
+ DECLARE_BITMAP(aqm, AP_DOMAINS);
+} ap_perms;
+static DEFINE_MUTEX(ap_perms_mutex);
+
static struct ap_config_info *ap_configuration;
static bool initialised;
@@ -670,11 +686,97 @@ static struct bus_type ap_bus_type = {
.pm = &ap_bus_pm_ops,
};
+static int __ap_revise_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_perms_mutex);
+ devres = test_bit_inv(card, ap_perms.apm)
+ && test_bit_inv(queue, ap_perms.aqm);
+ mutex_unlock(&ap_perms_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_revise_reserved);
+}
+
+int ap_owned_by_def_drv(int card, int queue)
+{
+ int rc = 0;
+
+ if (card < 0 || card >= AP_DEVICES || queue < 0 || queue >= AP_DOMAINS)
+ return -EINVAL;
+
+ mutex_lock(&ap_perms_mutex);
+
+ if (test_bit_inv(card, ap_perms.apm)
+ && test_bit_inv(queue, ap_perms.aqm))
+ rc = 1;
+
+ mutex_unlock(&ap_perms_mutex);
+
+ return rc;
+}
+EXPORT_SYMBOL(ap_owned_by_def_drv);
+
+int ap_apqn_in_matrix_owned_by_def_drv(unsigned long *apm,
+ unsigned long *aqm)
+{
+ int card, queue, rc = 0;
+
+ mutex_lock(&ap_perms_mutex);
+
+ for (card = 0; !rc && card < AP_DEVICES; card++)
+ if (test_bit_inv(card, apm) &&
+ test_bit_inv(card, ap_perms.apm))
+ for (queue = 0; !rc && queue < AP_DOMAINS; queue++)
+ if (test_bit_inv(queue, aqm) &&
+ test_bit_inv(queue, ap_perms.aqm))
+ rc = 1;
+
+ mutex_unlock(&ap_perms_mutex);
+
+ return rc;
+}
+EXPORT_SYMBOL(ap_apqn_in_matrix_owned_by_def_drv);
+
static int ap_device_probe(struct device *dev)
{
struct ap_device *ap_dev = to_ap_dev(dev);
struct ap_driver *ap_drv = to_ap_drv(dev->driver);
- int rc;
+ int card, queue, devres, drvres, rc;
+
+ if (is_queue_dev(dev)) {
+ /*
+ * If the apqn is marked as reserved/used by ap bus and
+ * default drivers, only probe with drivers with the default
+ * flag set. If it is not marked, only probe with drivers
+ * with the default flag not set.
+ */
+ card = AP_QID_CARD(to_ap_queue(dev)->qid);
+ queue = AP_QID_QUEUE(to_ap_queue(dev)->qid);
+ mutex_lock(&ap_perms_mutex);
+ devres = test_bit_inv(card, ap_perms.apm)
+ && test_bit_inv(queue, ap_perms.aqm);
+ mutex_unlock(&ap_perms_mutex);
+ drvres = ap_drv->flags & AP_DRIVER_FLAG_DEFAULT;
+ if (!!devres != !!drvres)
+ return -ENODEV;
+ }
/* Add queue/card to list of active queues/cards */
spin_lock_bh(&ap_list_lock);
@@ -757,6 +859,36 @@ EXPORT_SYMBOL(ap_bus_force_rescan);
/*
* AP bus attributes.
*/
+
+static int hex2bitmap(const char *str, unsigned long *bitmap, int bits)
+{
+ int i, n, b;
+
+ /* bits needs to be a multiple of 8 */
+ if (bits & 0x07)
+ return -EINVAL;
+
+ memset(bitmap, 0, bits / 8);
+
+ if (str[0] == '0' && str[1] == 'x')
+ str++;
+ if (*str == 'x')
+ str++;
+
+ for (i = 0; isxdigit(*str) && i < bits; str++) {
+ b = hex_to_bin(*str);
+ for (n = 0; n < 4; n++)
+ if (b & (0x08 >> n))
+ set_bit_inv(i + n, bitmap);
+ i += 4;
+ }
+
+ if (i < 4 || isxdigit(*str))
+ return -EINVAL;
+
+ return 0;
+}
+
static ssize_t ap_domain_show(struct bus_type *bus, char *buf)
{
return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index);
@@ -768,7 +900,8 @@ static ssize_t ap_domain_store(struct bus_type *bus,
int domain;
if (sscanf(buf, "%i\n", &domain) != 1 ||
- domain < 0 || domain > ap_max_domain_id)
+ domain < 0 || domain > ap_max_domain_id ||
+ !test_bit_inv(domain, ap_perms.aqm))
return -EINVAL;
spin_lock_bh(&ap_domain_lock);
ap_domain_index = domain;
@@ -903,6 +1036,114 @@ static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf)
static BUS_ATTR_RO(ap_max_domain_id);
+static ssize_t apmask_show(struct bus_type *bus, char *buf)
+{
+ int rc;
+
+ if (mutex_lock_interruptible(&ap_perms_mutex))
+ return -ERESTARTSYS;
+ rc = snprintf(buf, PAGE_SIZE,
+ "0x%016lx%016lx%016lx%016lx\n",
+ ap_perms.apm[0], ap_perms.apm[1],
+ ap_perms.apm[2], ap_perms.apm[3]);
+ mutex_unlock(&ap_perms_mutex);
+
+ return rc;
+}
+
+static ssize_t 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_perms_mutex))
+ return -ERESTARTSYS;
+ if (*buf == '-')
+ clear_bit_inv(-i, ap_perms.apm);
+ else
+ set_bit_inv(i, ap_perms.apm);
+ } else {
+ DECLARE_BITMAP(apm, AP_DEVICES);
+
+ i = hex2bitmap(buf, apm, AP_DEVICES);
+ if (i)
+ return i;
+ if (mutex_lock_interruptible(&ap_perms_mutex))
+ return -ERESTARTSYS;
+ for (i = 0; i < AP_DEVICES; i++)
+ if (test_bit_inv(i, apm))
+ set_bit_inv(i, ap_perms.apm);
+ else
+ clear_bit_inv(i, ap_perms.apm);
+ }
+ mutex_unlock(&ap_perms_mutex);
+
+ ap_bus_revise_bindings();
+
+ return count;
+}
+
+static BUS_ATTR_RW(apmask);
+
+static ssize_t aqmask_show(struct bus_type *bus, char *buf)
+{
+ int rc;
+
+ if (mutex_lock_interruptible(&ap_perms_mutex))
+ return -ERESTARTSYS;
+ rc = snprintf(buf, PAGE_SIZE,
+ "0x%016lx%016lx%016lx%016lx\n",
+ ap_perms.aqm[0], ap_perms.aqm[1],
+ ap_perms.aqm[2], ap_perms.aqm[3]);
+ mutex_unlock(&ap_perms_mutex);
+
+ return rc;
+}
+
+static ssize_t 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_perms_mutex))
+ return -ERESTARTSYS;
+ if (*buf == '-')
+ clear_bit_inv(-i, ap_perms.aqm);
+ else
+ set_bit_inv(i, ap_perms.aqm);
+ } else {
+ DECLARE_BITMAP(aqm, AP_DEVICES);
+
+ i = hex2bitmap(buf, aqm, AP_DEVICES);
+ if (i)
+ return i;
+ if (mutex_lock_interruptible(&ap_perms_mutex))
+ return -ERESTARTSYS;
+ for (i = 0; i < AP_DEVICES; i++)
+ if (test_bit_inv(i, aqm))
+ set_bit_inv(i, ap_perms.aqm);
+ else
+ clear_bit_inv(i, ap_perms.aqm);
+ }
+ mutex_unlock(&ap_perms_mutex);
+
+ ap_bus_revise_bindings();
+
+ return count;
+}
+
+static BUS_ATTR_RW(aqmask);
+
static struct bus_attribute *const ap_bus_attrs[] = {
&bus_attr_ap_domain,
&bus_attr_ap_control_domain_mask,
@@ -912,6 +1153,8 @@ static struct bus_attribute *const ap_bus_attrs[] = {
&bus_attr_ap_interrupts,
&bus_attr_poll_timeout,
&bus_attr_ap_max_domain_id,
+ &bus_attr_apmask,
+ &bus_attr_aqmask,
NULL,
};
@@ -940,7 +1183,8 @@ static int ap_select_domain(void)
best_domain = -1;
max_count = 0;
for (i = 0; i < AP_DOMAINS; i++) {
- if (!ap_test_config_domain(i))
+ if (!ap_test_config_domain(i) ||
+ !test_bit_inv(i, ap_perms.aqm))
continue;
count = 0;
for (j = 0; j < AP_DEVICES; j++) {
@@ -1190,6 +1434,37 @@ static int __init ap_debug_init(void)
return 0;
}
+static void __init ap_perms_init(void)
+{
+ int i, rc;
+
+ /* start with all resources useable */
+ memset(&ap_perms.apm, 0xFF, sizeof(ap_perms.apm));
+ memset(&ap_perms.aqm, 0xFF, sizeof(ap_perms.aqm));
+
+ /* process kernel parameters apm and aqm if given */
+ if (apm_str) {
+ DECLARE_BITMAP(apm, AP_DEVICES);
+
+ rc = hex2bitmap(apm_str, apm, AP_DEVICES);
+ if (rc == 0) {
+ for (i = 0; i < AP_DEVICES; i++)
+ if (!test_bit_inv(i, apm))
+ clear_bit_inv(i, ap_perms.apm);
+ }
+ }
+ if (aqm_str) {
+ DECLARE_BITMAP(aqm, AP_DOMAINS);
+
+ rc = hex2bitmap(aqm_str, aqm, AP_DOMAINS);
+ if (rc == 0) {
+ for (i = 0; i < AP_DOMAINS; i++)
+ if (!test_bit_inv(i, aqm))
+ clear_bit_inv(i, ap_perms.aqm);
+ }
+ }
+}
+
/**
* ap_module_init(): The module initialization code.
*
@@ -1209,6 +1484,9 @@ static int __init ap_module_init(void)
return -ENODEV;
}
+ /* set up the AP permissions (ap and aq masks) */
+ ap_perms_init();
+
/* Get AP configuration data if available */
ap_init_configuration();
@@ -1217,7 +1495,9 @@ static int __init ap_module_init(void)
ap_max_domain_id ? ap_max_domain_id : AP_DOMAINS - 1;
else
max_domain_id = 15;
- if (ap_domain_index < -1 || ap_domain_index > max_domain_id) {
+ if (ap_domain_index < -1 || ap_domain_index > max_domain_id ||
+ (ap_domain_index >= 0 &&
+ !test_bit_inv(ap_domain_index, ap_perms.aqm))) {
pr_warn("%d is not a valid cryptographic domain\n",
ap_domain_index);
ap_domain_index = -1;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-20 20:40:41 +0100